Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Packet matching code. |
| 3 | * |
| 4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 12 | #include <linux/capability.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 13 | #include <linux/in.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/kmod.h> |
| 16 | #include <linux/vmalloc.h> |
| 17 | #include <linux/netdevice.h> |
| 18 | #include <linux/module.h> |
Randy Dunlap | 4bdbf6c | 2006-07-03 19:47:27 -0700 | [diff] [blame] | 19 | #include <linux/poison.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/icmpv6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <net/ipv6.h> |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 22 | #include <net/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <asm/uaccess.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 24 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/proc_fs.h> |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 26 | #include <linux/err.h> |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 27 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | #include <linux/netfilter_ipv6/ip6_tables.h> |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 30 | #include <linux/netfilter/x_tables.h> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 31 | #include <net/netfilter/nf_log.h> |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 32 | #include "../../netfilter/xt_repldata.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | MODULE_LICENSE("GPL"); |
| 35 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 36 | MODULE_DESCRIPTION("IPv6 packet filter"); |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | /*#define DEBUG_IP_FIREWALL*/ |
| 39 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ |
| 40 | /*#define DEBUG_IP_FIREWALL_USER*/ |
| 41 | |
| 42 | #ifdef DEBUG_IP_FIREWALL |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 43 | #define dprintf(format, args...) pr_info(format , ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #else |
| 45 | #define dprintf(format, args...) |
| 46 | #endif |
| 47 | |
| 48 | #ifdef DEBUG_IP_FIREWALL_USER |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 49 | #define duprintf(format, args...) pr_info(format , ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #else |
| 51 | #define duprintf(format, args...) |
| 52 | #endif |
| 53 | |
| 54 | #ifdef CONFIG_NETFILTER_DEBUG |
Stephen Hemminger | af56760 | 2010-05-13 15:00:20 +0200 | [diff] [blame] | 55 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #else |
| 57 | #define IP_NF_ASSERT(x) |
| 58 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #if 0 |
| 61 | /* All the better to debug you with... */ |
| 62 | #define static |
| 63 | #define inline |
| 64 | #endif |
| 65 | |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 66 | void *ip6t_alloc_initial_table(const struct xt_table *info) |
| 67 | { |
| 68 | return xt_alloc_initial_table(ip6t, IP6T); |
| 69 | } |
| 70 | EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table); |
| 71 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 72 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | We keep a set of rules for each CPU, so we can avoid write-locking |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 74 | them in the softirq when updating the counters and therefore |
| 75 | only need to read-lock in the softirq; doing a write_lock_bh() in user |
| 76 | context stops packets coming through and allows user context to read |
| 77 | the counters or update the rules. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | Hence the start of any table is given by get_table() below. */ |
| 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | /* Check for an extension */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 82 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | ip6t_ext_hdr(u8 nexthdr) |
| 84 | { |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 85 | return (nexthdr == IPPROTO_HOPOPTS) || |
| 86 | (nexthdr == IPPROTO_ROUTING) || |
| 87 | (nexthdr == IPPROTO_FRAGMENT) || |
| 88 | (nexthdr == IPPROTO_ESP) || |
| 89 | (nexthdr == IPPROTO_AH) || |
| 90 | (nexthdr == IPPROTO_NONE) || |
| 91 | (nexthdr == IPPROTO_DSTOPTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
| 94 | /* Returns whether matches rule or not. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 95 | /* Performance critical - called for every packet */ |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 96 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | ip6_packet_match(const struct sk_buff *skb, |
| 98 | const char *indev, |
| 99 | const char *outdev, |
| 100 | const struct ip6t_ip6 *ip6info, |
| 101 | unsigned int *protoff, |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 102 | int *fragoff, bool *hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | unsigned long ret; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 105 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 107 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
Patrick McHardy | f2ffd9e | 2006-03-20 18:03:16 -0800 | [diff] [blame] | 109 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 110 | &ip6info->src), IP6T_INV_SRCIP) || |
| 111 | FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, |
| 112 | &ip6info->dst), IP6T_INV_DSTIP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | dprintf("Source or dest mismatch.\n"); |
| 114 | /* |
| 115 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, |
| 116 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, |
| 117 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); |
| 118 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, |
| 119 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, |
| 120 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 121 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
Eric Dumazet | b8dfe49 | 2009-03-25 17:31:52 +0100 | [diff] [blame] | 124 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
| 126 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { |
| 127 | dprintf("VIA in mismatch (%s vs %s).%s\n", |
| 128 | indev, ip6info->iniface, |
| 129 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 130 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | } |
| 132 | |
Eric Dumazet | b8dfe49 | 2009-03-25 17:31:52 +0100 | [diff] [blame] | 133 | ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { |
| 136 | dprintf("VIA out mismatch (%s vs %s).%s\n", |
| 137 | outdev, ip6info->outiface, |
| 138 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 139 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | /* ... might want to do something with class and flowlabel here ... */ |
| 143 | |
| 144 | /* look for the desired protocol header */ |
| 145 | if((ip6info->flags & IP6T_F_PROTO)) { |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 146 | int protohdr; |
| 147 | unsigned short _frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 149 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
Patrick McHardy | 51d8b1a | 2006-10-24 16:14:04 -0700 | [diff] [blame] | 150 | if (protohdr < 0) { |
| 151 | if (_frag_off == 0) |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 152 | *hotdrop = true; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 153 | return false; |
Patrick McHardy | 51d8b1a | 2006-10-24 16:14:04 -0700 | [diff] [blame] | 154 | } |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 155 | *fragoff = _frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
| 157 | dprintf("Packet protocol %hi ?= %s%hi.\n", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 158 | protohdr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
| 160 | ip6info->proto); |
| 161 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 162 | if (ip6info->proto == protohdr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | if(ip6info->invflags & IP6T_INV_PROTO) { |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 164 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | } |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 166 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | /* We need match for the '-p all', too! */ |
| 170 | if ((ip6info->proto != 0) && |
| 171 | !(ip6info->invflags & IP6T_INV_PROTO)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 172 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | } |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 174 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | /* should be ip6 safe */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 178 | static bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
| 180 | { |
| 181 | if (ipv6->flags & ~IP6T_F_MASK) { |
| 182 | duprintf("Unknown flag bits set: %08X\n", |
| 183 | ipv6->flags & ~IP6T_F_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 184 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
| 186 | if (ipv6->invflags & ~IP6T_INV_MASK) { |
| 187 | duprintf("Unknown invflag bits set: %08X\n", |
| 188 | ipv6->invflags & ~IP6T_INV_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 189 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 191 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | static unsigned int |
Jan Engelhardt | 4b560b4 | 2009-07-05 19:43:26 +0200 | [diff] [blame] | 195 | ip6t_error(struct sk_buff *skb, const struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | { |
| 197 | if (net_ratelimit()) |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 198 | pr_info("error: `%s'\n", (const char *)par->targinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | return NF_DROP; |
| 201 | } |
| 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | static inline struct ip6t_entry * |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 204 | get_entry(const void *base, unsigned int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | { |
| 206 | return (struct ip6t_entry *)(base + offset); |
| 207 | } |
| 208 | |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 209 | /* All zeroes == unconditional rule. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 210 | /* Mildly perf critical (only if packet tracing is on) */ |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 211 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 212 | { |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 213 | static const struct ip6t_ip6 uncond; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 214 | |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 215 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 216 | } |
| 217 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 218 | static inline const struct xt_entry_target * |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 219 | ip6t_get_target_c(const struct ip6t_entry *e) |
| 220 | { |
| 221 | return ip6t_get_target((struct ip6t_entry *)e); |
| 222 | } |
| 223 | |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 224 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
| 225 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) |
| 226 | /* This cries for unification! */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 227 | static const char *const hooknames[] = { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 228 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
| 229 | [NF_INET_LOCAL_IN] = "INPUT", |
| 230 | [NF_INET_FORWARD] = "FORWARD", |
| 231 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
| 232 | [NF_INET_POST_ROUTING] = "POSTROUTING", |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 233 | }; |
| 234 | |
| 235 | enum nf_ip_trace_comments { |
| 236 | NF_IP6_TRACE_COMMENT_RULE, |
| 237 | NF_IP6_TRACE_COMMENT_RETURN, |
| 238 | NF_IP6_TRACE_COMMENT_POLICY, |
| 239 | }; |
| 240 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 241 | static const char *const comments[] = { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 242 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
| 243 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", |
| 244 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", |
| 245 | }; |
| 246 | |
| 247 | static struct nf_loginfo trace_loginfo = { |
| 248 | .type = NF_LOG_TYPE_LOG, |
| 249 | .u = { |
| 250 | .log = { |
| 251 | .level = 4, |
| 252 | .logflags = NF_LOG_MASK, |
| 253 | }, |
| 254 | }, |
| 255 | }; |
| 256 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 257 | /* Mildly perf critical (only if packet tracing is on) */ |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 258 | static inline int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 259 | get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e, |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 260 | const char *hookname, const char **chainname, |
| 261 | const char **comment, unsigned int *rulenum) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 262 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 263 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 264 | |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 265 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 266 | /* Head of user chain: ERROR target with chainname */ |
| 267 | *chainname = t->target.data; |
| 268 | (*rulenum) = 0; |
| 269 | } else if (s == e) { |
| 270 | (*rulenum)++; |
| 271 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 272 | if (s->target_offset == sizeof(struct ip6t_entry) && |
| 273 | strcmp(t->target.u.kernel.target->name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 274 | XT_STANDARD_TARGET) == 0 && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 275 | t->verdict < 0 && |
| 276 | unconditional(&s->ipv6)) { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 277 | /* Tail of chains: STANDARD target (return/policy) */ |
| 278 | *comment = *chainname == hookname |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 279 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
| 280 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 281 | } |
| 282 | return 1; |
| 283 | } else |
| 284 | (*rulenum)++; |
| 285 | |
| 286 | return 0; |
| 287 | } |
| 288 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 289 | static void trace_packet(const struct sk_buff *skb, |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 290 | unsigned int hook, |
| 291 | const struct net_device *in, |
| 292 | const struct net_device *out, |
Jan Engelhardt | ecb6f85 | 2008-01-31 03:54:47 -0800 | [diff] [blame] | 293 | const char *tablename, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 294 | const struct xt_table_info *private, |
| 295 | const struct ip6t_entry *e) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 296 | { |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 297 | const void *table_base; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 298 | const struct ip6t_entry *root; |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 299 | const char *hookname, *chainname, *comment; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 300 | const struct ip6t_entry *iter; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 301 | unsigned int rulenum = 0; |
| 302 | |
Jan Engelhardt | ccf5bd8 | 2009-04-15 20:27:03 +0200 | [diff] [blame] | 303 | table_base = private->entries[smp_processor_id()]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 304 | root = get_entry(table_base, private->hook_entry[hook]); |
| 305 | |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 306 | hookname = chainname = hooknames[hook]; |
| 307 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 308 | |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 309 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
| 310 | if (get_chainname_rulenum(iter, e, hookname, |
| 311 | &chainname, &comment, &rulenum) != 0) |
| 312 | break; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 313 | |
| 314 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, |
| 315 | "TRACE: %s:%s:%s:%u ", |
| 316 | tablename, chainname, comment, rulenum); |
| 317 | } |
| 318 | #endif |
| 319 | |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 320 | static inline __pure struct ip6t_entry * |
| 321 | ip6t_next_entry(const struct ip6t_entry *entry) |
| 322 | { |
| 323 | return (void *)entry + entry->next_offset; |
| 324 | } |
| 325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
| 327 | unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 328 | ip6t_do_table(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | unsigned int hook, |
| 330 | const struct net_device *in, |
| 331 | const struct net_device *out, |
Patrick McHardy | fe1cb10 | 2006-08-22 00:35:47 -0700 | [diff] [blame] | 332 | struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | { |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 334 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
| 336 | unsigned int verdict = NF_DROP; |
| 337 | const char *indev, *outdev; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 338 | const void *table_base; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 339 | struct ip6t_entry *e, **jumpstack; |
| 340 | unsigned int *stackptr, origptr, cpu; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 341 | const struct xt_table_info *private; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 342 | struct xt_action_param acpar; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 343 | unsigned int addend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
| 345 | /* Initialization */ |
| 346 | indev = in ? in->name : nulldevname; |
| 347 | outdev = out ? out->name : nulldevname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | /* We handle fragments by dealing with the first fragment as |
| 349 | * if it was a normal packet. All other fragments are treated |
| 350 | * normally, except that they will NEVER match rules that ask |
| 351 | * things we don't know, ie. tcp syn flag or ports). If the |
| 352 | * rule is also a fragment-specific rule, non-fragments won't |
| 353 | * match it. */ |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 354 | acpar.hotdrop = false; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 355 | acpar.in = in; |
| 356 | acpar.out = out; |
| 357 | acpar.family = NFPROTO_IPV6; |
| 358 | acpar.hooknum = hook; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 361 | |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 362 | local_bh_disable(); |
| 363 | addend = xt_write_recseq_begin(); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 364 | private = table->private; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 365 | cpu = smp_processor_id(); |
| 366 | table_base = private->entries[cpu]; |
| 367 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; |
Eric Dumazet | 7489aec | 2010-05-31 16:41:35 +0200 | [diff] [blame] | 368 | stackptr = per_cpu_ptr(private->stackptr, cpu); |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 369 | origptr = *stackptr; |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 370 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 371 | e = get_entry(table_base, private->hook_entry[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | do { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 374 | const struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 375 | const struct xt_entry_match *ematch; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | IP_NF_ASSERT(e); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 378 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 379 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 380 | no_match: |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 381 | e = ip6t_next_entry(e); |
| 382 | continue; |
| 383 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
Jan Engelhardt | ef53d70 | 2009-07-09 19:14:18 +0200 | [diff] [blame] | 385 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 386 | acpar.match = ematch->u.kernel.match; |
| 387 | acpar.matchinfo = ematch->data; |
| 388 | if (!acpar.match->match(skb, &acpar)) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 389 | goto no_match; |
Jan Engelhardt | ef53d70 | 2009-07-09 19:14:18 +0200 | [diff] [blame] | 390 | } |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 391 | |
Changli Gao | 261abc8 | 2010-07-23 16:24:34 +0200 | [diff] [blame] | 392 | ADD_COUNTER(e->counters, skb->len, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 394 | t = ip6t_get_target_c(e); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 395 | IP_NF_ASSERT(t->u.kernel.target); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 396 | |
| 397 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
| 398 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 399 | /* The packet is traced: log it */ |
| 400 | if (unlikely(skb->nf_trace)) |
| 401 | trace_packet(skb, hook, in, out, |
| 402 | table->name, private, e); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 403 | #endif |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 404 | /* Standard target? */ |
| 405 | if (!t->u.kernel.target->target) { |
| 406 | int v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 408 | v = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 409 | if (v < 0) { |
| 410 | /* Pop from stack? */ |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 411 | if (v != XT_RETURN) { |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 412 | verdict = (unsigned)(-v) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | break; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 414 | } |
Eric Dumazet | db85667 | 2011-03-20 15:40:06 +0100 | [diff] [blame] | 415 | if (*stackptr <= origptr) |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 416 | e = get_entry(table_base, |
| 417 | private->underflow[hook]); |
| 418 | else |
| 419 | e = ip6t_next_entry(jumpstack[--*stackptr]); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 420 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 422 | if (table_base + v != ip6t_next_entry(e) && |
| 423 | !(e->ipv6.flags & IP6T_F_GOTO)) { |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 424 | if (*stackptr >= private->stacksize) { |
| 425 | verdict = NF_DROP; |
| 426 | break; |
| 427 | } |
| 428 | jumpstack[(*stackptr)++] = e; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 429 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 431 | e = get_entry(table_base, v); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 432 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | } |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 434 | |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 435 | acpar.target = t->u.kernel.target; |
| 436 | acpar.targinfo = t->data; |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 437 | |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 438 | verdict = t->u.kernel.target->target(skb, &acpar); |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 439 | if (verdict == XT_CONTINUE) |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 440 | e = ip6t_next_entry(e); |
| 441 | else |
| 442 | /* Verdict */ |
| 443 | break; |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 444 | } while (!acpar.hotdrop); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 446 | *stackptr = origptr; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 447 | |
| 448 | xt_write_recseq_end(addend); |
| 449 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
| 451 | #ifdef DEBUG_ALLOW_ALL |
| 452 | return NF_ACCEPT; |
| 453 | #else |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 454 | if (acpar.hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | return NF_DROP; |
| 456 | else return verdict; |
| 457 | #endif |
| 458 | } |
| 459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | /* Figures out from what hook each rule can be called: returns 0 if |
| 461 | there are loops. Puts hook bitmask in comefrom. */ |
| 462 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 463 | mark_source_chains(const struct xt_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 464 | unsigned int valid_hooks, void *entry0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | { |
| 466 | unsigned int hook; |
| 467 | |
| 468 | /* No recursion; use packet counter to save back ptrs (reset |
| 469 | to 0 as we leave), and comefrom to save source hook bitmask */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 470 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | unsigned int pos = newinfo->hook_entry[hook]; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 472 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
| 474 | if (!(valid_hooks & (1 << hook))) |
| 475 | continue; |
| 476 | |
| 477 | /* Set initial back pointer. */ |
| 478 | e->counters.pcnt = pos; |
| 479 | |
| 480 | for (;;) { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 481 | const struct xt_standard_target *t |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 482 | = (void *)ip6t_get_target_c(e); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 483 | int visited = e->comefrom & (1 << hook); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 485 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
Stephen Hemminger | 654d0fb | 2010-05-13 15:02:08 +0200 | [diff] [blame] | 486 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | hook, pos, e->comefrom); |
| 488 | return 0; |
| 489 | } |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 490 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
| 492 | /* Unconditional return/END. */ |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 493 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
| 494 | (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 495 | XT_STANDARD_TARGET) == 0) && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 496 | t->verdict < 0 && |
| 497 | unconditional(&e->ipv6)) || visited) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | unsigned int oldpos, size; |
| 499 | |
Patrick McHardy | 1f9352a | 2009-03-25 19:26:35 +0100 | [diff] [blame] | 500 | if ((strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 501 | XT_STANDARD_TARGET) == 0) && |
Patrick McHardy | 1f9352a | 2009-03-25 19:26:35 +0100 | [diff] [blame] | 502 | t->verdict < -NF_MAX_VERDICT - 1) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 503 | duprintf("mark_source_chains: bad " |
| 504 | "negative verdict (%i)\n", |
| 505 | t->verdict); |
| 506 | return 0; |
| 507 | } |
| 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | /* Return: backtrack through the last |
| 510 | big jump. */ |
| 511 | do { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 512 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | #ifdef DEBUG_IP_FIREWALL_USER |
| 514 | if (e->comefrom |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 515 | & (1 << NF_INET_NUMHOOKS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | duprintf("Back unset " |
| 517 | "on hook %u " |
| 518 | "rule %u\n", |
| 519 | hook, pos); |
| 520 | } |
| 521 | #endif |
| 522 | oldpos = pos; |
| 523 | pos = e->counters.pcnt; |
| 524 | e->counters.pcnt = 0; |
| 525 | |
| 526 | /* We're at the start. */ |
| 527 | if (pos == oldpos) |
| 528 | goto next; |
| 529 | |
| 530 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 531 | (entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | } while (oldpos == pos + e->next_offset); |
| 533 | |
| 534 | /* Move along one */ |
| 535 | size = e->next_offset; |
| 536 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 537 | (entry0 + pos + size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | e->counters.pcnt = pos; |
| 539 | pos += size; |
| 540 | } else { |
| 541 | int newpos = t->verdict; |
| 542 | |
| 543 | if (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 544 | XT_STANDARD_TARGET) == 0 && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 545 | newpos >= 0) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 546 | if (newpos > newinfo->size - |
| 547 | sizeof(struct ip6t_entry)) { |
| 548 | duprintf("mark_source_chains: " |
| 549 | "bad verdict (%i)\n", |
| 550 | newpos); |
| 551 | return 0; |
| 552 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | /* This a jump; chase it. */ |
| 554 | duprintf("Jump rule %u -> %u\n", |
| 555 | pos, newpos); |
| 556 | } else { |
| 557 | /* ... this is a fallthru */ |
| 558 | newpos = pos + e->next_offset; |
| 559 | } |
| 560 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 561 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | e->counters.pcnt = pos; |
| 563 | pos = newpos; |
| 564 | } |
| 565 | } |
| 566 | next: |
| 567 | duprintf("Finished chain %u\n", hook); |
| 568 | } |
| 569 | return 1; |
| 570 | } |
| 571 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 572 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | { |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 574 | struct xt_mtdtor_param par; |
| 575 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 576 | par.net = net; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 577 | par.match = m->u.kernel.match; |
| 578 | par.matchinfo = m->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 579 | par.family = NFPROTO_IPV6; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 580 | if (par.match->destroy != NULL) |
| 581 | par.match->destroy(&par); |
| 582 | module_put(par.match->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | } |
| 584 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 585 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 586 | check_entry(const struct ip6t_entry *e, const char *name) |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 587 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 588 | const struct xt_entry_target *t; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 589 | |
| 590 | if (!ip6_checkentry(&e->ipv6)) { |
| 591 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); |
| 592 | return -EINVAL; |
| 593 | } |
| 594 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 595 | if (e->target_offset + sizeof(struct xt_entry_target) > |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 596 | e->next_offset) |
| 597 | return -EINVAL; |
| 598 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 599 | t = ip6t_get_target_c(e); |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 600 | if (e->target_offset + t->u.target_size > e->next_offset) |
| 601 | return -EINVAL; |
| 602 | |
| 603 | return 0; |
| 604 | } |
| 605 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 606 | static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 607 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 608 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 609 | int ret; |
| 610 | |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 611 | par->match = m->u.kernel.match; |
| 612 | par->matchinfo = m->data; |
| 613 | |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 614 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 615 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 616 | if (ret < 0) { |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 617 | duprintf("ip_tables: check failed for `%s'.\n", |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 618 | par.match->name); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 619 | return ret; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 620 | } |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 621 | return 0; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 622 | } |
| 623 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 624 | static int |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 625 | find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 627 | struct xt_match *match; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 628 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 630 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
| 631 | m->u.user.revision); |
| 632 | if (IS_ERR(match)) { |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 633 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 634 | return PTR_ERR(match); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | } |
| 636 | m->u.kernel.match = match; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 638 | ret = check_match(m, par); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 639 | if (ret) |
| 640 | goto err; |
| 641 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 643 | err: |
| 644 | module_put(m->u.kernel.match->me); |
| 645 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | } |
| 647 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 648 | static int check_target(struct ip6t_entry *e, struct net *net, const char *name) |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 649 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 650 | struct xt_entry_target *t = ip6t_get_target(e); |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 651 | struct xt_tgchk_param par = { |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 652 | .net = net, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 653 | .table = name, |
| 654 | .entryinfo = e, |
| 655 | .target = t->u.kernel.target, |
| 656 | .targinfo = t->data, |
| 657 | .hook_mask = e->comefrom, |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 658 | .family = NFPROTO_IPV6, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 659 | }; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 660 | int ret; |
| 661 | |
| 662 | t = ip6t_get_target(e); |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 663 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 664 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 665 | if (ret < 0) { |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 666 | duprintf("ip_tables: check failed for `%s'.\n", |
| 667 | t->u.kernel.target->name); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 668 | return ret; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 669 | } |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 670 | return 0; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 671 | } |
| 672 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 673 | static int |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 674 | find_check_entry(struct ip6t_entry *e, struct net *net, const char *name, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 675 | unsigned int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 677 | struct xt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 678 | struct xt_target *target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | int ret; |
| 680 | unsigned int j; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 681 | struct xt_mtchk_param mtpar; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 682 | struct xt_entry_match *ematch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 684 | ret = check_entry(e, name); |
| 685 | if (ret) |
| 686 | return ret; |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 687 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | j = 0; |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 689 | mtpar.net = net; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 690 | mtpar.table = name; |
| 691 | mtpar.entryinfo = &e->ipv6; |
| 692 | mtpar.hook_mask = e->comefrom; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 693 | mtpar.family = NFPROTO_IPV6; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 694 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 695 | ret = find_check_match(ematch, &mtpar); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 696 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 697 | goto cleanup_matches; |
| 698 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 699 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
| 701 | t = ip6t_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 702 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
| 703 | t->u.user.revision); |
| 704 | if (IS_ERR(target)) { |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 705 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 706 | ret = PTR_ERR(target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | goto cleanup_matches; |
| 708 | } |
| 709 | t->u.kernel.target = target; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 710 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 711 | ret = check_target(e, net, name); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 712 | if (ret) |
| 713 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 715 | err: |
| 716 | module_put(t->u.kernel.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | cleanup_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 718 | xt_ematch_foreach(ematch, e) { |
| 719 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 720 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 721 | cleanup_match(ematch, net); |
| 722 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | return ret; |
| 724 | } |
| 725 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 726 | static bool check_underflow(const struct ip6t_entry *e) |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 727 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 728 | const struct xt_entry_target *t; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 729 | unsigned int verdict; |
| 730 | |
| 731 | if (!unconditional(&e->ipv6)) |
| 732 | return false; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 733 | t = ip6t_get_target_c(e); |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 734 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
| 735 | return false; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 736 | verdict = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 737 | verdict = -verdict - 1; |
| 738 | return verdict == NF_DROP || verdict == NF_ACCEPT; |
| 739 | } |
| 740 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 741 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | check_entry_size_and_hooks(struct ip6t_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 743 | struct xt_table_info *newinfo, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 744 | const unsigned char *base, |
| 745 | const unsigned char *limit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | const unsigned int *hook_entries, |
| 747 | const unsigned int *underflows, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 748 | unsigned int valid_hooks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | { |
| 750 | unsigned int h; |
| 751 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 752 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
| 753 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | duprintf("Bad offset %p\n", e); |
| 755 | return -EINVAL; |
| 756 | } |
| 757 | |
| 758 | if (e->next_offset |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 759 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | duprintf("checking: element %p size %u\n", |
| 761 | e, e->next_offset); |
| 762 | return -EINVAL; |
| 763 | } |
| 764 | |
| 765 | /* Check hooks & underflows */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 766 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Jan Engelhardt | a7d5173 | 2009-07-18 14:52:58 +0200 | [diff] [blame] | 767 | if (!(valid_hooks & (1 << h))) |
| 768 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | if ((unsigned char *)e - base == hook_entries[h]) |
| 770 | newinfo->hook_entry[h] = hook_entries[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 771 | if ((unsigned char *)e - base == underflows[h]) { |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 772 | if (!check_underflow(e)) { |
| 773 | pr_err("Underflows must be unconditional and " |
| 774 | "use the STANDARD target with " |
| 775 | "ACCEPT/DROP\n"); |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 776 | return -EINVAL; |
| 777 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | newinfo->underflow[h] = underflows[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 779 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | } |
| 781 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | /* Clear counters and comefrom */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 783 | e->counters = ((struct xt_counters) { 0, 0 }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | e->comefrom = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | return 0; |
| 786 | } |
| 787 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 788 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | { |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 790 | struct xt_tgdtor_param par; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 791 | struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 792 | struct xt_entry_match *ematch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | /* Cleanup all matches */ |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 795 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 796 | cleanup_match(ematch, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | t = ip6t_get_target(e); |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 798 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 799 | par.net = net; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 800 | par.target = t->u.kernel.target; |
| 801 | par.targinfo = t->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 802 | par.family = NFPROTO_IPV6; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 803 | if (par.target->destroy != NULL) |
| 804 | par.target->destroy(&par); |
| 805 | module_put(par.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | /* Checks and translates the user-supplied table segment (held in |
| 809 | newinfo) */ |
| 810 | static int |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 811 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
| 812 | const struct ip6t_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 814 | struct ip6t_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | unsigned int i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 816 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 818 | newinfo->size = repl->size; |
| 819 | newinfo->number = repl->num_entries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
| 821 | /* Init all hooks to impossible value. */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 822 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
| 824 | newinfo->underflow[i] = 0xFFFFFFFF; |
| 825 | } |
| 826 | |
| 827 | duprintf("translate_table: size %u\n", newinfo->size); |
| 828 | i = 0; |
| 829 | /* Walk through entries, checking offsets. */ |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 830 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 831 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 832 | entry0 + repl->size, |
| 833 | repl->hook_entry, |
| 834 | repl->underflow, |
| 835 | repl->valid_hooks); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 836 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 837 | return ret; |
| 838 | ++i; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 839 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
| 840 | XT_ERROR_TARGET) == 0) |
| 841 | ++newinfo->stacksize; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 842 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 844 | if (i != repl->num_entries) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | duprintf("translate_table: %u not %u entries\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 846 | i, repl->num_entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | return -EINVAL; |
| 848 | } |
| 849 | |
| 850 | /* Check hooks all assigned */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 851 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | /* Only hooks which are valid */ |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 853 | if (!(repl->valid_hooks & (1 << i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | continue; |
| 855 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { |
| 856 | duprintf("Invalid hook entry %u %u\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 857 | i, repl->hook_entry[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | return -EINVAL; |
| 859 | } |
| 860 | if (newinfo->underflow[i] == 0xFFFFFFFF) { |
| 861 | duprintf("Invalid underflow %u %u\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 862 | i, repl->underflow[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | return -EINVAL; |
| 864 | } |
| 865 | } |
| 866 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 867 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 868 | return -ELOOP; |
| 869 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | /* Finally, each sanity check must pass */ |
| 871 | i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 872 | xt_entry_foreach(iter, entry0, newinfo->size) { |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 873 | ret = find_check_entry(iter, net, repl->name, repl->size); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 874 | if (ret != 0) |
| 875 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 876 | ++i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 877 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 879 | if (ret != 0) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 880 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 881 | if (i-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 882 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 883 | cleanup_entry(iter, net); |
| 884 | } |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 885 | return ret; |
| 886 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
| 888 | /* And one copy for every other CPU */ |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 889 | for_each_possible_cpu(i) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 890 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
| 891 | memcpy(newinfo->entries[i], entry0, newinfo->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | } |
| 893 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 894 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | } |
| 896 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | static void |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 898 | get_counters(const struct xt_table_info *t, |
| 899 | struct xt_counters counters[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 901 | struct ip6t_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | unsigned int cpu; |
| 903 | unsigned int i; |
| 904 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 905 | for_each_possible_cpu(cpu) { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 906 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 907 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | i = 0; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 909 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 910 | u64 bcnt, pcnt; |
| 911 | unsigned int start; |
| 912 | |
| 913 | do { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 914 | start = read_seqcount_begin(s); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 915 | bcnt = iter->counters.bcnt; |
| 916 | pcnt = iter->counters.pcnt; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 917 | } while (read_seqcount_retry(s, start)); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 918 | |
| 919 | ADD_COUNTER(counters[i], bcnt, pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 920 | ++i; |
| 921 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | } |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 923 | } |
| 924 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 925 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | { |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 927 | unsigned int countersize; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 928 | struct xt_counters *counters; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 929 | const struct xt_table_info *private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
| 931 | /* We need atomic snapshot of counters: rest doesn't change |
| 932 | (other than comefrom, which userspace doesn't care |
| 933 | about). */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 934 | countersize = sizeof(struct xt_counters) * private->number; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 935 | counters = vzalloc(countersize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | |
| 937 | if (counters == NULL) |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 938 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 940 | get_counters(private, counters); |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 941 | |
Eric Dumazet | 49a88d1 | 2009-04-06 17:06:55 +0200 | [diff] [blame] | 942 | return counters; |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 943 | } |
| 944 | |
| 945 | static int |
| 946 | copy_entries_to_user(unsigned int total_size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 947 | const struct xt_table *table, |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 948 | void __user *userptr) |
| 949 | { |
| 950 | unsigned int off, num; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 951 | const struct ip6t_entry *e; |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 952 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 953 | const struct xt_table_info *private = table->private; |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 954 | int ret = 0; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 955 | const void *loc_cpu_entry; |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 956 | |
| 957 | counters = alloc_counters(table); |
| 958 | if (IS_ERR(counters)) |
| 959 | return PTR_ERR(counters); |
| 960 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 961 | /* choose the copy that is on our node/cpu, ... |
| 962 | * This choice is lazy (because current thread is |
| 963 | * allowed to migrate to another cpu) |
| 964 | */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 965 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 966 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | ret = -EFAULT; |
| 968 | goto free_counters; |
| 969 | } |
| 970 | |
| 971 | /* FIXME: use iterator macros --RR */ |
| 972 | /* ... then go back and fix counters and names */ |
| 973 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ |
| 974 | unsigned int i; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 975 | const struct xt_entry_match *m; |
| 976 | const struct xt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 978 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | if (copy_to_user(userptr + off |
| 980 | + offsetof(struct ip6t_entry, counters), |
| 981 | &counters[num], |
| 982 | sizeof(counters[num])) != 0) { |
| 983 | ret = -EFAULT; |
| 984 | goto free_counters; |
| 985 | } |
| 986 | |
| 987 | for (i = sizeof(struct ip6t_entry); |
| 988 | i < e->target_offset; |
| 989 | i += m->u.match_size) { |
| 990 | m = (void *)e + i; |
| 991 | |
| 992 | if (copy_to_user(userptr + off + i |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 993 | + offsetof(struct xt_entry_match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | u.user.name), |
| 995 | m->u.kernel.match->name, |
| 996 | strlen(m->u.kernel.match->name)+1) |
| 997 | != 0) { |
| 998 | ret = -EFAULT; |
| 999 | goto free_counters; |
| 1000 | } |
| 1001 | } |
| 1002 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1003 | t = ip6t_get_target_c(e); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | if (copy_to_user(userptr + off + e->target_offset |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1005 | + offsetof(struct xt_entry_target, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | u.user.name), |
| 1007 | t->u.kernel.target->name, |
| 1008 | strlen(t->u.kernel.target->name)+1) != 0) { |
| 1009 | ret = -EFAULT; |
| 1010 | goto free_counters; |
| 1011 | } |
| 1012 | } |
| 1013 | |
| 1014 | free_counters: |
| 1015 | vfree(counters); |
| 1016 | return ret; |
| 1017 | } |
| 1018 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1019 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 1020 | static void compat_standard_from_user(void *dst, const void *src) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1021 | { |
| 1022 | int v = *(compat_int_t *)src; |
| 1023 | |
| 1024 | if (v > 0) |
| 1025 | v += xt_compat_calc_jump(AF_INET6, v); |
| 1026 | memcpy(dst, &v, sizeof(v)); |
| 1027 | } |
| 1028 | |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 1029 | static int compat_standard_to_user(void __user *dst, const void *src) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1030 | { |
| 1031 | compat_int_t cv = *(int *)src; |
| 1032 | |
| 1033 | if (cv > 0) |
| 1034 | cv -= xt_compat_calc_jump(AF_INET6, cv); |
| 1035 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
| 1036 | } |
| 1037 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1038 | static int compat_calc_entry(const struct ip6t_entry *e, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1039 | const struct xt_table_info *info, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1040 | const void *base, struct xt_table_info *newinfo) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1041 | { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1042 | const struct xt_entry_match *ematch; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1043 | const struct xt_entry_target *t; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1044 | unsigned int entry_offset; |
| 1045 | int off, i, ret; |
| 1046 | |
| 1047 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); |
| 1048 | entry_offset = (void *)e - base; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1049 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1050 | off += xt_compat_match_offset(ematch->u.kernel.match); |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1051 | t = ip6t_get_target_c(e); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1052 | off += xt_compat_target_offset(t->u.kernel.target); |
| 1053 | newinfo->size -= off; |
| 1054 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); |
| 1055 | if (ret) |
| 1056 | return ret; |
| 1057 | |
| 1058 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
| 1059 | if (info->hook_entry[i] && |
| 1060 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) |
| 1061 | newinfo->hook_entry[i] -= off; |
| 1062 | if (info->underflow[i] && |
| 1063 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) |
| 1064 | newinfo->underflow[i] -= off; |
| 1065 | } |
| 1066 | return 0; |
| 1067 | } |
| 1068 | |
| 1069 | static int compat_table_info(const struct xt_table_info *info, |
| 1070 | struct xt_table_info *newinfo) |
| 1071 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1072 | struct ip6t_entry *iter; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1073 | void *loc_cpu_entry; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1074 | int ret; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1075 | |
| 1076 | if (!newinfo || !info) |
| 1077 | return -EINVAL; |
| 1078 | |
| 1079 | /* we dont care about newinfo->entries[] */ |
| 1080 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
| 1081 | newinfo->initial_entries = 0; |
| 1082 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
Eric Dumazet | 255d0dc | 2010-12-18 18:35:15 +0100 | [diff] [blame] | 1083 | xt_compat_init_offsets(AF_INET6, info->number); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1084 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
| 1085 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); |
| 1086 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1087 | return ret; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1088 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1089 | return 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1090 | } |
| 1091 | #endif |
| 1092 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1093 | static int get_info(struct net *net, void __user *user, |
| 1094 | const int *len, int compat) |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1095 | { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1096 | char name[XT_TABLE_MAXNAMELEN]; |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1097 | struct xt_table *t; |
| 1098 | int ret; |
| 1099 | |
| 1100 | if (*len != sizeof(struct ip6t_getinfo)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1101 | duprintf("length %u != %zu\n", *len, |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1102 | sizeof(struct ip6t_getinfo)); |
| 1103 | return -EINVAL; |
| 1104 | } |
| 1105 | |
| 1106 | if (copy_from_user(name, user, sizeof(name)) != 0) |
| 1107 | return -EFAULT; |
| 1108 | |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1109 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1110 | #ifdef CONFIG_COMPAT |
| 1111 | if (compat) |
| 1112 | xt_compat_lock(AF_INET6); |
| 1113 | #endif |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1114 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1115 | "ip6table_%s", name); |
| 1116 | if (t && !IS_ERR(t)) { |
| 1117 | struct ip6t_getinfo info; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1118 | const struct xt_table_info *private = t->private; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1119 | #ifdef CONFIG_COMPAT |
Alexey Dobriyan | 14c7dbe | 2010-02-08 11:17:43 -0800 | [diff] [blame] | 1120 | struct xt_table_info tmp; |
| 1121 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1122 | if (compat) { |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1123 | ret = compat_table_info(private, &tmp); |
| 1124 | xt_compat_flush_offsets(AF_INET6); |
| 1125 | private = &tmp; |
| 1126 | } |
| 1127 | #endif |
Jan Engelhardt | cccbe5e | 2010-11-03 18:55:39 -0700 | [diff] [blame] | 1128 | memset(&info, 0, sizeof(info)); |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1129 | info.valid_hooks = t->valid_hooks; |
| 1130 | memcpy(info.hook_entry, private->hook_entry, |
| 1131 | sizeof(info.hook_entry)); |
| 1132 | memcpy(info.underflow, private->underflow, |
| 1133 | sizeof(info.underflow)); |
| 1134 | info.num_entries = private->number; |
| 1135 | info.size = private->size; |
Patrick McHardy | b5dd674 | 2007-12-17 21:52:35 -0800 | [diff] [blame] | 1136 | strcpy(info.name, name); |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1137 | |
| 1138 | if (copy_to_user(user, &info, *len) != 0) |
| 1139 | ret = -EFAULT; |
| 1140 | else |
| 1141 | ret = 0; |
| 1142 | |
| 1143 | xt_table_unlock(t); |
| 1144 | module_put(t->me); |
| 1145 | } else |
| 1146 | ret = t ? PTR_ERR(t) : -ENOENT; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1147 | #ifdef CONFIG_COMPAT |
| 1148 | if (compat) |
| 1149 | xt_compat_unlock(AF_INET6); |
| 1150 | #endif |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1151 | return ret; |
| 1152 | } |
| 1153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1155 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
| 1156 | const int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | { |
| 1158 | int ret; |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 1159 | struct ip6t_get_entries get; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1160 | struct xt_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 1162 | if (*len < sizeof(get)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1163 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 1164 | return -EINVAL; |
| 1165 | } |
| 1166 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1167 | return -EFAULT; |
| 1168 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1169 | duprintf("get_entries: %u != %zu\n", |
| 1170 | *len, sizeof(get) + get.size); |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 1171 | return -EINVAL; |
| 1172 | } |
| 1173 | |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1174 | t = xt_find_table_lock(net, AF_INET6, get.name); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1175 | if (t && !IS_ERR(t)) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1176 | struct xt_table_info *private = t->private; |
| 1177 | duprintf("t->private->number = %u\n", private->number); |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 1178 | if (get.size == private->size) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1179 | ret = copy_entries_to_user(private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | t, uptr->entrytable); |
| 1181 | else { |
| 1182 | duprintf("get_entries: I've got %u not %u!\n", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1183 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1184 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | } |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1186 | module_put(t->me); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1187 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | } else |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1189 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | |
| 1191 | return ret; |
| 1192 | } |
| 1193 | |
| 1194 | static int |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1195 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1196 | struct xt_table_info *newinfo, unsigned int num_counters, |
| 1197 | void __user *counters_ptr) |
| 1198 | { |
| 1199 | int ret; |
| 1200 | struct xt_table *t; |
| 1201 | struct xt_table_info *oldinfo; |
| 1202 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1203 | const void *loc_cpu_old_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1204 | struct ip6t_entry *iter; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1205 | |
| 1206 | ret = 0; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 1207 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1208 | if (!counters) { |
| 1209 | ret = -ENOMEM; |
| 1210 | goto out; |
| 1211 | } |
| 1212 | |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1213 | t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name), |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1214 | "ip6table_%s", name); |
| 1215 | if (!t || IS_ERR(t)) { |
| 1216 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1217 | goto free_newinfo_counters_untrans; |
| 1218 | } |
| 1219 | |
| 1220 | /* You lied! */ |
| 1221 | if (valid_hooks != t->valid_hooks) { |
| 1222 | duprintf("Valid hook crap: %08X vs %08X\n", |
| 1223 | valid_hooks, t->valid_hooks); |
| 1224 | ret = -EINVAL; |
| 1225 | goto put_module; |
| 1226 | } |
| 1227 | |
| 1228 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
| 1229 | if (!oldinfo) |
| 1230 | goto put_module; |
| 1231 | |
| 1232 | /* Update module usage count based on number of rules */ |
| 1233 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", |
| 1234 | oldinfo->number, oldinfo->initial_entries, newinfo->number); |
| 1235 | if ((oldinfo->number > oldinfo->initial_entries) || |
| 1236 | (newinfo->number <= oldinfo->initial_entries)) |
| 1237 | module_put(t->me); |
| 1238 | if ((oldinfo->number > oldinfo->initial_entries) && |
| 1239 | (newinfo->number <= oldinfo->initial_entries)) |
| 1240 | module_put(t->me); |
| 1241 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1242 | /* Get the old counters, and synchronize with replace */ |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1243 | get_counters(oldinfo, counters); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1244 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1245 | /* Decrease module usage counts and free resource */ |
| 1246 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1247 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1248 | cleanup_entry(iter, net); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1249 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1250 | xt_free_table_info(oldinfo); |
| 1251 | if (copy_to_user(counters_ptr, counters, |
| 1252 | sizeof(struct xt_counters) * num_counters) != 0) |
| 1253 | ret = -EFAULT; |
| 1254 | vfree(counters); |
| 1255 | xt_table_unlock(t); |
| 1256 | return ret; |
| 1257 | |
| 1258 | put_module: |
| 1259 | module_put(t->me); |
| 1260 | xt_table_unlock(t); |
| 1261 | free_newinfo_counters_untrans: |
| 1262 | vfree(counters); |
| 1263 | out: |
| 1264 | return ret; |
| 1265 | } |
| 1266 | |
| 1267 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1268 | do_replace(struct net *net, const void __user *user, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | { |
| 1270 | int ret; |
| 1271 | struct ip6t_replace tmp; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1272 | struct xt_table_info *newinfo; |
| 1273 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1274 | struct ip6t_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | |
| 1276 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1277 | return -EFAULT; |
| 1278 | |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1279 | /* overflow check */ |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1280 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1281 | return -ENOMEM; |
Vasiliy Kulikov | 6a8ab060 | 2011-03-15 13:37:13 +0100 | [diff] [blame] | 1282 | tmp.name[sizeof(tmp.name)-1] = 0; |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1283 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1284 | newinfo = xt_alloc_table_info(tmp.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | if (!newinfo) |
| 1286 | return -ENOMEM; |
| 1287 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1288 | /* choose the copy that is on our node/cpu */ |
| 1289 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 1290 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | tmp.size) != 0) { |
| 1292 | ret = -EFAULT; |
| 1293 | goto free_newinfo; |
| 1294 | } |
| 1295 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 1296 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | if (ret != 0) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1298 | goto free_newinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | |
| 1300 | duprintf("ip_tables: Translated table\n"); |
| 1301 | |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1302 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1303 | tmp.num_counters, tmp.counters); |
| 1304 | if (ret) |
| 1305 | goto free_newinfo_untrans; |
| 1306 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1308 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1309 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1310 | cleanup_entry(iter, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | free_newinfo: |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1312 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | return ret; |
| 1314 | } |
| 1315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1317 | do_add_counters(struct net *net, const void __user *user, unsigned int len, |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1318 | int compat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | { |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1320 | unsigned int i, curcpu; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1321 | struct xt_counters_info tmp; |
| 1322 | struct xt_counters *paddc; |
| 1323 | unsigned int num_counters; |
| 1324 | char *name; |
| 1325 | int size; |
| 1326 | void *ptmp; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1327 | struct xt_table *t; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1328 | const struct xt_table_info *private; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1329 | int ret = 0; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1330 | const void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1331 | struct ip6t_entry *iter; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1332 | unsigned int addend; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1333 | #ifdef CONFIG_COMPAT |
| 1334 | struct compat_xt_counters_info compat_tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1336 | if (compat) { |
| 1337 | ptmp = &compat_tmp; |
| 1338 | size = sizeof(struct compat_xt_counters_info); |
| 1339 | } else |
| 1340 | #endif |
| 1341 | { |
| 1342 | ptmp = &tmp; |
| 1343 | size = sizeof(struct xt_counters_info); |
| 1344 | } |
| 1345 | |
| 1346 | if (copy_from_user(ptmp, user, size) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | return -EFAULT; |
| 1348 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1349 | #ifdef CONFIG_COMPAT |
| 1350 | if (compat) { |
| 1351 | num_counters = compat_tmp.num_counters; |
| 1352 | name = compat_tmp.name; |
| 1353 | } else |
| 1354 | #endif |
| 1355 | { |
| 1356 | num_counters = tmp.num_counters; |
| 1357 | name = tmp.name; |
| 1358 | } |
| 1359 | |
| 1360 | if (len != size + num_counters * sizeof(struct xt_counters)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | return -EINVAL; |
| 1362 | |
Eric Dumazet | e12f8e2 | 2010-06-04 13:31:29 +0200 | [diff] [blame] | 1363 | paddc = vmalloc(len - size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | if (!paddc) |
| 1365 | return -ENOMEM; |
| 1366 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1367 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | ret = -EFAULT; |
| 1369 | goto free; |
| 1370 | } |
| 1371 | |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1372 | t = xt_find_table_lock(net, AF_INET6, name); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1373 | if (!t || IS_ERR(t)) { |
| 1374 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | goto free; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1376 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1378 | |
| 1379 | local_bh_disable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1380 | private = t->private; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1381 | if (private->number != num_counters) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | ret = -EINVAL; |
| 1383 | goto unlock_up_free; |
| 1384 | } |
| 1385 | |
| 1386 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1387 | /* Choose the copy that is on our node */ |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1388 | curcpu = smp_processor_id(); |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1389 | addend = xt_write_recseq_begin(); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1390 | loc_cpu_entry = private->entries[curcpu]; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1391 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
| 1392 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); |
| 1393 | ++i; |
| 1394 | } |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1395 | xt_write_recseq_end(addend); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | unlock_up_free: |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1398 | local_bh_enable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1399 | xt_table_unlock(t); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1400 | module_put(t->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | free: |
| 1402 | vfree(paddc); |
| 1403 | |
| 1404 | return ret; |
| 1405 | } |
| 1406 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1407 | #ifdef CONFIG_COMPAT |
| 1408 | struct compat_ip6t_replace { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1409 | char name[XT_TABLE_MAXNAMELEN]; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1410 | u32 valid_hooks; |
| 1411 | u32 num_entries; |
| 1412 | u32 size; |
| 1413 | u32 hook_entry[NF_INET_NUMHOOKS]; |
| 1414 | u32 underflow[NF_INET_NUMHOOKS]; |
| 1415 | u32 num_counters; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1416 | compat_uptr_t counters; /* struct xt_counters * */ |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1417 | struct compat_ip6t_entry entries[0]; |
| 1418 | }; |
| 1419 | |
| 1420 | static int |
| 1421 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1422 | unsigned int *size, struct xt_counters *counters, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1423 | unsigned int i) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1424 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1425 | struct xt_entry_target *t; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1426 | struct compat_ip6t_entry __user *ce; |
| 1427 | u_int16_t target_offset, next_offset; |
| 1428 | compat_uint_t origsize; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1429 | const struct xt_entry_match *ematch; |
| 1430 | int ret = 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1431 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1432 | origsize = *size; |
| 1433 | ce = (struct compat_ip6t_entry __user *)*dstptr; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1434 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
| 1435 | copy_to_user(&ce->counters, &counters[i], |
| 1436 | sizeof(counters[i])) != 0) |
| 1437 | return -EFAULT; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1438 | |
| 1439 | *dstptr += sizeof(struct compat_ip6t_entry); |
| 1440 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); |
| 1441 | |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1442 | xt_ematch_foreach(ematch, e) { |
| 1443 | ret = xt_compat_match_to_user(ematch, dstptr, size); |
| 1444 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1445 | return ret; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1446 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1447 | target_offset = e->target_offset - (origsize - *size); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1448 | t = ip6t_get_target(e); |
| 1449 | ret = xt_compat_target_to_user(t, dstptr, size); |
| 1450 | if (ret) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1451 | return ret; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1452 | next_offset = e->next_offset - (origsize - *size); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1453 | if (put_user(target_offset, &ce->target_offset) != 0 || |
| 1454 | put_user(next_offset, &ce->next_offset) != 0) |
| 1455 | return -EFAULT; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1456 | return 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1457 | } |
| 1458 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1459 | static int |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1460 | compat_find_calc_match(struct xt_entry_match *m, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1461 | const char *name, |
| 1462 | const struct ip6t_ip6 *ipv6, |
| 1463 | unsigned int hookmask, |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1464 | int *size) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1465 | { |
| 1466 | struct xt_match *match; |
| 1467 | |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 1468 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
| 1469 | m->u.user.revision); |
| 1470 | if (IS_ERR(match)) { |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1471 | duprintf("compat_check_calc_match: `%s' not found\n", |
| 1472 | m->u.user.name); |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 1473 | return PTR_ERR(match); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1474 | } |
| 1475 | m->u.kernel.match = match; |
| 1476 | *size += xt_compat_match_offset(match); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1477 | return 0; |
| 1478 | } |
| 1479 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1480 | static void compat_release_entry(struct compat_ip6t_entry *e) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1481 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1482 | struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1483 | struct xt_entry_match *ematch; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1484 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1485 | /* Cleanup all matches */ |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1486 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1487 | module_put(ematch->u.kernel.match->me); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1488 | t = compat_ip6t_get_target(e); |
| 1489 | module_put(t->u.kernel.target->me); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1490 | } |
| 1491 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1492 | static int |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1493 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
| 1494 | struct xt_table_info *newinfo, |
| 1495 | unsigned int *size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1496 | const unsigned char *base, |
| 1497 | const unsigned char *limit, |
| 1498 | const unsigned int *hook_entries, |
| 1499 | const unsigned int *underflows, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1500 | const char *name) |
| 1501 | { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1502 | struct xt_entry_match *ematch; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1503 | struct xt_entry_target *t; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1504 | struct xt_target *target; |
| 1505 | unsigned int entry_offset; |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1506 | unsigned int j; |
| 1507 | int ret, off, h; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1508 | |
| 1509 | duprintf("check_compat_entry_size_and_hooks %p\n", e); |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 1510 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
| 1511 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1512 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
| 1513 | return -EINVAL; |
| 1514 | } |
| 1515 | |
| 1516 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + |
| 1517 | sizeof(struct compat_xt_entry_target)) { |
| 1518 | duprintf("checking: element %p size %u\n", |
| 1519 | e, e->next_offset); |
| 1520 | return -EINVAL; |
| 1521 | } |
| 1522 | |
| 1523 | /* For purposes of check_entry casting the compat entry is fine */ |
| 1524 | ret = check_entry((struct ip6t_entry *)e, name); |
| 1525 | if (ret) |
| 1526 | return ret; |
| 1527 | |
| 1528 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); |
| 1529 | entry_offset = (void *)e - (void *)base; |
| 1530 | j = 0; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1531 | xt_ematch_foreach(ematch, e) { |
| 1532 | ret = compat_find_calc_match(ematch, name, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1533 | &e->ipv6, e->comefrom, &off); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1534 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1535 | goto release_matches; |
| 1536 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1537 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1538 | |
| 1539 | t = compat_ip6t_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1540 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
| 1541 | t->u.user.revision); |
| 1542 | if (IS_ERR(target)) { |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1543 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
| 1544 | t->u.user.name); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1545 | ret = PTR_ERR(target); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1546 | goto release_matches; |
| 1547 | } |
| 1548 | t->u.kernel.target = target; |
| 1549 | |
| 1550 | off += xt_compat_target_offset(target); |
| 1551 | *size += off; |
| 1552 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); |
| 1553 | if (ret) |
| 1554 | goto out; |
| 1555 | |
| 1556 | /* Check hooks & underflows */ |
| 1557 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
| 1558 | if ((unsigned char *)e - base == hook_entries[h]) |
| 1559 | newinfo->hook_entry[h] = hook_entries[h]; |
| 1560 | if ((unsigned char *)e - base == underflows[h]) |
| 1561 | newinfo->underflow[h] = underflows[h]; |
| 1562 | } |
| 1563 | |
| 1564 | /* Clear counters and comefrom */ |
| 1565 | memset(&e->counters, 0, sizeof(e->counters)); |
| 1566 | e->comefrom = 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1567 | return 0; |
| 1568 | |
| 1569 | out: |
| 1570 | module_put(t->u.kernel.target->me); |
| 1571 | release_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1572 | xt_ematch_foreach(ematch, e) { |
| 1573 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1574 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1575 | module_put(ematch->u.kernel.match->me); |
| 1576 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1577 | return ret; |
| 1578 | } |
| 1579 | |
| 1580 | static int |
| 1581 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, |
| 1582 | unsigned int *size, const char *name, |
| 1583 | struct xt_table_info *newinfo, unsigned char *base) |
| 1584 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1585 | struct xt_entry_target *t; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1586 | struct ip6t_entry *de; |
| 1587 | unsigned int origsize; |
| 1588 | int ret, h; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1589 | struct xt_entry_match *ematch; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1590 | |
| 1591 | ret = 0; |
| 1592 | origsize = *size; |
| 1593 | de = (struct ip6t_entry *)*dstptr; |
| 1594 | memcpy(de, e, sizeof(struct ip6t_entry)); |
| 1595 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
| 1596 | |
| 1597 | *dstptr += sizeof(struct ip6t_entry); |
| 1598 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); |
| 1599 | |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1600 | xt_ematch_foreach(ematch, e) { |
| 1601 | ret = xt_compat_match_from_user(ematch, dstptr, size); |
| 1602 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1603 | return ret; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1604 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1605 | de->target_offset = e->target_offset - (origsize - *size); |
| 1606 | t = compat_ip6t_get_target(e); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1607 | xt_compat_target_from_user(t, dstptr, size); |
| 1608 | |
| 1609 | de->next_offset = e->next_offset - (origsize - *size); |
| 1610 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
| 1611 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
| 1612 | newinfo->hook_entry[h] -= origsize - *size; |
| 1613 | if ((unsigned char *)de - base < newinfo->underflow[h]) |
| 1614 | newinfo->underflow[h] -= origsize - *size; |
| 1615 | } |
| 1616 | return ret; |
| 1617 | } |
| 1618 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1619 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1620 | const char *name) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1621 | { |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1622 | unsigned int j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1623 | int ret = 0; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1624 | struct xt_mtchk_param mtpar; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1625 | struct xt_entry_match *ematch; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1626 | |
| 1627 | j = 0; |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1628 | mtpar.net = net; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1629 | mtpar.table = name; |
| 1630 | mtpar.entryinfo = &e->ipv6; |
| 1631 | mtpar.hook_mask = e->comefrom; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 1632 | mtpar.family = NFPROTO_IPV6; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1633 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1634 | ret = check_match(ematch, &mtpar); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1635 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1636 | goto cleanup_matches; |
| 1637 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1638 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1639 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 1640 | ret = check_target(e, net, name); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1641 | if (ret) |
| 1642 | goto cleanup_matches; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1643 | return 0; |
| 1644 | |
| 1645 | cleanup_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1646 | xt_ematch_foreach(ematch, e) { |
| 1647 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1648 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1649 | cleanup_match(ematch, net); |
| 1650 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1651 | return ret; |
| 1652 | } |
| 1653 | |
| 1654 | static int |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1655 | translate_compat_table(struct net *net, |
| 1656 | const char *name, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1657 | unsigned int valid_hooks, |
| 1658 | struct xt_table_info **pinfo, |
| 1659 | void **pentry0, |
| 1660 | unsigned int total_size, |
| 1661 | unsigned int number, |
| 1662 | unsigned int *hook_entries, |
| 1663 | unsigned int *underflows) |
| 1664 | { |
| 1665 | unsigned int i, j; |
| 1666 | struct xt_table_info *newinfo, *info; |
| 1667 | void *pos, *entry0, *entry1; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1668 | struct compat_ip6t_entry *iter0; |
| 1669 | struct ip6t_entry *iter1; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1670 | unsigned int size; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1671 | int ret = 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1672 | |
| 1673 | info = *pinfo; |
| 1674 | entry0 = *pentry0; |
| 1675 | size = total_size; |
| 1676 | info->number = number; |
| 1677 | |
| 1678 | /* Init all hooks to impossible value. */ |
| 1679 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
| 1680 | info->hook_entry[i] = 0xFFFFFFFF; |
| 1681 | info->underflow[i] = 0xFFFFFFFF; |
| 1682 | } |
| 1683 | |
| 1684 | duprintf("translate_compat_table: size %u\n", info->size); |
| 1685 | j = 0; |
| 1686 | xt_compat_lock(AF_INET6); |
Eric Dumazet | 255d0dc | 2010-12-18 18:35:15 +0100 | [diff] [blame] | 1687 | xt_compat_init_offsets(AF_INET6, number); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1688 | /* Walk through entries, checking offsets. */ |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1689 | xt_entry_foreach(iter0, entry0, total_size) { |
| 1690 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1691 | entry0, |
| 1692 | entry0 + total_size, |
| 1693 | hook_entries, |
| 1694 | underflows, |
| 1695 | name); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1696 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1697 | goto out_unlock; |
| 1698 | ++j; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1699 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1700 | |
| 1701 | ret = -EINVAL; |
| 1702 | if (j != number) { |
| 1703 | duprintf("translate_compat_table: %u not %u entries\n", |
| 1704 | j, number); |
| 1705 | goto out_unlock; |
| 1706 | } |
| 1707 | |
| 1708 | /* Check hooks all assigned */ |
| 1709 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
| 1710 | /* Only hooks which are valid */ |
| 1711 | if (!(valid_hooks & (1 << i))) |
| 1712 | continue; |
| 1713 | if (info->hook_entry[i] == 0xFFFFFFFF) { |
| 1714 | duprintf("Invalid hook entry %u %u\n", |
| 1715 | i, hook_entries[i]); |
| 1716 | goto out_unlock; |
| 1717 | } |
| 1718 | if (info->underflow[i] == 0xFFFFFFFF) { |
| 1719 | duprintf("Invalid underflow %u %u\n", |
| 1720 | i, underflows[i]); |
| 1721 | goto out_unlock; |
| 1722 | } |
| 1723 | } |
| 1724 | |
| 1725 | ret = -ENOMEM; |
| 1726 | newinfo = xt_alloc_table_info(size); |
| 1727 | if (!newinfo) |
| 1728 | goto out_unlock; |
| 1729 | |
| 1730 | newinfo->number = number; |
| 1731 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
| 1732 | newinfo->hook_entry[i] = info->hook_entry[i]; |
| 1733 | newinfo->underflow[i] = info->underflow[i]; |
| 1734 | } |
| 1735 | entry1 = newinfo->entries[raw_smp_processor_id()]; |
| 1736 | pos = entry1; |
| 1737 | size = total_size; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1738 | xt_entry_foreach(iter0, entry0, total_size) { |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1739 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
| 1740 | name, newinfo, entry1); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1741 | if (ret != 0) |
| 1742 | break; |
| 1743 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1744 | xt_compat_flush_offsets(AF_INET6); |
| 1745 | xt_compat_unlock(AF_INET6); |
| 1746 | if (ret) |
| 1747 | goto free_newinfo; |
| 1748 | |
| 1749 | ret = -ELOOP; |
| 1750 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) |
| 1751 | goto free_newinfo; |
| 1752 | |
| 1753 | i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1754 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1755 | ret = compat_check_entry(iter1, net, name); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1756 | if (ret != 0) |
| 1757 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1758 | ++i; |
Florian Westphal | cca77b7 | 2010-08-23 14:41:22 -0700 | [diff] [blame] | 1759 | if (strcmp(ip6t_get_target(iter1)->u.user.name, |
| 1760 | XT_ERROR_TARGET) == 0) |
| 1761 | ++newinfo->stacksize; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1762 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1763 | if (ret) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1764 | /* |
| 1765 | * The first i matches need cleanup_entry (calls ->destroy) |
| 1766 | * because they had called ->check already. The other j-i |
| 1767 | * entries need only release. |
| 1768 | */ |
| 1769 | int skip = i; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1770 | j -= i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1771 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
| 1772 | if (skip-- > 0) |
| 1773 | continue; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1774 | if (j-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1775 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1776 | compat_release_entry(iter0); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1777 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1778 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
| 1779 | if (i-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1780 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1781 | cleanup_entry(iter1, net); |
| 1782 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1783 | xt_free_table_info(newinfo); |
| 1784 | return ret; |
| 1785 | } |
| 1786 | |
| 1787 | /* And one copy for every other CPU */ |
| 1788 | for_each_possible_cpu(i) |
| 1789 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
| 1790 | memcpy(newinfo->entries[i], entry1, newinfo->size); |
| 1791 | |
| 1792 | *pinfo = newinfo; |
| 1793 | *pentry0 = entry1; |
| 1794 | xt_free_table_info(info); |
| 1795 | return 0; |
| 1796 | |
| 1797 | free_newinfo: |
| 1798 | xt_free_table_info(newinfo); |
| 1799 | out: |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1800 | xt_entry_foreach(iter0, entry0, total_size) { |
| 1801 | if (j-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1802 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1803 | compat_release_entry(iter0); |
| 1804 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1805 | return ret; |
| 1806 | out_unlock: |
| 1807 | xt_compat_flush_offsets(AF_INET6); |
| 1808 | xt_compat_unlock(AF_INET6); |
| 1809 | goto out; |
| 1810 | } |
| 1811 | |
| 1812 | static int |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1813 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1814 | { |
| 1815 | int ret; |
| 1816 | struct compat_ip6t_replace tmp; |
| 1817 | struct xt_table_info *newinfo; |
| 1818 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1819 | struct ip6t_entry *iter; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1820 | |
| 1821 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1822 | return -EFAULT; |
| 1823 | |
| 1824 | /* overflow check */ |
| 1825 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
| 1826 | return -ENOMEM; |
| 1827 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1828 | return -ENOMEM; |
Vasiliy Kulikov | 6a8ab060 | 2011-03-15 13:37:13 +0100 | [diff] [blame] | 1829 | tmp.name[sizeof(tmp.name)-1] = 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1830 | |
| 1831 | newinfo = xt_alloc_table_info(tmp.size); |
| 1832 | if (!newinfo) |
| 1833 | return -ENOMEM; |
| 1834 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1835 | /* choose the copy that is on our node/cpu */ |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1836 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 1837 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
| 1838 | tmp.size) != 0) { |
| 1839 | ret = -EFAULT; |
| 1840 | goto free_newinfo; |
| 1841 | } |
| 1842 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1843 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1844 | &newinfo, &loc_cpu_entry, tmp.size, |
| 1845 | tmp.num_entries, tmp.hook_entry, |
| 1846 | tmp.underflow); |
| 1847 | if (ret != 0) |
| 1848 | goto free_newinfo; |
| 1849 | |
| 1850 | duprintf("compat_do_replace: Translated table\n"); |
| 1851 | |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1852 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1853 | tmp.num_counters, compat_ptr(tmp.counters)); |
| 1854 | if (ret) |
| 1855 | goto free_newinfo_untrans; |
| 1856 | return 0; |
| 1857 | |
| 1858 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1859 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1860 | cleanup_entry(iter, net); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1861 | free_newinfo: |
| 1862 | xt_free_table_info(newinfo); |
| 1863 | return ret; |
| 1864 | } |
| 1865 | |
| 1866 | static int |
| 1867 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, |
| 1868 | unsigned int len) |
| 1869 | { |
| 1870 | int ret; |
| 1871 | |
| 1872 | if (!capable(CAP_NET_ADMIN)) |
| 1873 | return -EPERM; |
| 1874 | |
| 1875 | switch (cmd) { |
| 1876 | case IP6T_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1877 | ret = compat_do_replace(sock_net(sk), user, len); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1878 | break; |
| 1879 | |
| 1880 | case IP6T_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1881 | ret = do_add_counters(sock_net(sk), user, len, 1); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1882 | break; |
| 1883 | |
| 1884 | default: |
| 1885 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); |
| 1886 | ret = -EINVAL; |
| 1887 | } |
| 1888 | |
| 1889 | return ret; |
| 1890 | } |
| 1891 | |
| 1892 | struct compat_ip6t_get_entries { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1893 | char name[XT_TABLE_MAXNAMELEN]; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1894 | compat_uint_t size; |
| 1895 | struct compat_ip6t_entry entrytable[0]; |
| 1896 | }; |
| 1897 | |
| 1898 | static int |
| 1899 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, |
| 1900 | void __user *userptr) |
| 1901 | { |
| 1902 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1903 | const struct xt_table_info *private = table->private; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1904 | void __user *pos; |
| 1905 | unsigned int size; |
| 1906 | int ret = 0; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1907 | const void *loc_cpu_entry; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1908 | unsigned int i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1909 | struct ip6t_entry *iter; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1910 | |
| 1911 | counters = alloc_counters(table); |
| 1912 | if (IS_ERR(counters)) |
| 1913 | return PTR_ERR(counters); |
| 1914 | |
| 1915 | /* choose the copy that is on our node/cpu, ... |
| 1916 | * This choice is lazy (because current thread is |
| 1917 | * allowed to migrate to another cpu) |
| 1918 | */ |
| 1919 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
| 1920 | pos = userptr; |
| 1921 | size = total_size; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1922 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
| 1923 | ret = compat_copy_entry_to_user(iter, &pos, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1924 | &size, counters, i++); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1925 | if (ret != 0) |
| 1926 | break; |
| 1927 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1928 | |
| 1929 | vfree(counters); |
| 1930 | return ret; |
| 1931 | } |
| 1932 | |
| 1933 | static int |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1934 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
| 1935 | int *len) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1936 | { |
| 1937 | int ret; |
| 1938 | struct compat_ip6t_get_entries get; |
| 1939 | struct xt_table *t; |
| 1940 | |
| 1941 | if (*len < sizeof(get)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1942 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1943 | return -EINVAL; |
| 1944 | } |
| 1945 | |
| 1946 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1947 | return -EFAULT; |
| 1948 | |
| 1949 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1950 | duprintf("compat_get_entries: %u != %zu\n", |
| 1951 | *len, sizeof(get) + get.size); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1952 | return -EINVAL; |
| 1953 | } |
| 1954 | |
| 1955 | xt_compat_lock(AF_INET6); |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1956 | t = xt_find_table_lock(net, AF_INET6, get.name); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1957 | if (t && !IS_ERR(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1958 | const struct xt_table_info *private = t->private; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1959 | struct xt_table_info info; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1960 | duprintf("t->private->number = %u\n", private->number); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1961 | ret = compat_table_info(private, &info); |
| 1962 | if (!ret && get.size == info.size) { |
| 1963 | ret = compat_copy_entries_to_user(private->size, |
| 1964 | t, uptr->entrytable); |
| 1965 | } else if (!ret) { |
| 1966 | duprintf("compat_get_entries: I've got %u not %u!\n", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1967 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1968 | ret = -EAGAIN; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1969 | } |
| 1970 | xt_compat_flush_offsets(AF_INET6); |
| 1971 | module_put(t->me); |
| 1972 | xt_table_unlock(t); |
| 1973 | } else |
| 1974 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1975 | |
| 1976 | xt_compat_unlock(AF_INET6); |
| 1977 | return ret; |
| 1978 | } |
| 1979 | |
| 1980 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); |
| 1981 | |
| 1982 | static int |
| 1983 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1984 | { |
| 1985 | int ret; |
| 1986 | |
| 1987 | if (!capable(CAP_NET_ADMIN)) |
| 1988 | return -EPERM; |
| 1989 | |
| 1990 | switch (cmd) { |
| 1991 | case IP6T_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1992 | ret = get_info(sock_net(sk), user, len, 1); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1993 | break; |
| 1994 | case IP6T_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1995 | ret = compat_get_entries(sock_net(sk), user, len); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1996 | break; |
| 1997 | default: |
| 1998 | ret = do_ip6t_get_ctl(sk, cmd, user, len); |
| 1999 | } |
| 2000 | return ret; |
| 2001 | } |
| 2002 | #endif |
| 2003 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2004 | static int |
| 2005 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
| 2006 | { |
| 2007 | int ret; |
| 2008 | |
| 2009 | if (!capable(CAP_NET_ADMIN)) |
| 2010 | return -EPERM; |
| 2011 | |
| 2012 | switch (cmd) { |
| 2013 | case IP6T_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2014 | ret = do_replace(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | break; |
| 2016 | |
| 2017 | case IP6T_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2018 | ret = do_add_counters(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | break; |
| 2020 | |
| 2021 | default: |
| 2022 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); |
| 2023 | ret = -EINVAL; |
| 2024 | } |
| 2025 | |
| 2026 | return ret; |
| 2027 | } |
| 2028 | |
| 2029 | static int |
| 2030 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 2031 | { |
| 2032 | int ret; |
| 2033 | |
| 2034 | if (!capable(CAP_NET_ADMIN)) |
| 2035 | return -EPERM; |
| 2036 | |
| 2037 | switch (cmd) { |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 2038 | case IP6T_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2039 | ret = get_info(sock_net(sk), user, len, 0); |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 2040 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 2042 | case IP6T_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2043 | ret = get_entries(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2046 | case IP6T_SO_GET_REVISION_MATCH: |
| 2047 | case IP6T_SO_GET_REVISION_TARGET: { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 2048 | struct xt_get_revision rev; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2049 | int target; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2050 | |
| 2051 | if (*len != sizeof(rev)) { |
| 2052 | ret = -EINVAL; |
| 2053 | break; |
| 2054 | } |
| 2055 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { |
| 2056 | ret = -EFAULT; |
| 2057 | break; |
| 2058 | } |
Vasiliy Kulikov | 6a8ab060 | 2011-03-15 13:37:13 +0100 | [diff] [blame] | 2059 | rev.name[sizeof(rev.name)-1] = 0; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2060 | |
| 2061 | if (cmd == IP6T_SO_GET_REVISION_TARGET) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2062 | target = 1; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2063 | else |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2064 | target = 0; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2065 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2066 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
| 2067 | rev.revision, |
| 2068 | target, &ret), |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2069 | "ip6t_%s", rev.name); |
| 2070 | break; |
| 2071 | } |
| 2072 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | default: |
| 2074 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); |
| 2075 | ret = -EINVAL; |
| 2076 | } |
| 2077 | |
| 2078 | return ret; |
| 2079 | } |
| 2080 | |
Jan Engelhardt | 35aad0f | 2009-08-24 14:56:30 +0200 | [diff] [blame] | 2081 | struct xt_table *ip6t_register_table(struct net *net, |
| 2082 | const struct xt_table *table, |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 2083 | const struct ip6t_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | { |
| 2085 | int ret; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2086 | struct xt_table_info *newinfo; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 2087 | struct xt_table_info bootstrap = {0}; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2088 | void *loc_cpu_entry; |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 2089 | struct xt_table *new_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2091 | newinfo = xt_alloc_table_info(repl->size); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2092 | if (!newinfo) { |
| 2093 | ret = -ENOMEM; |
| 2094 | goto out; |
| 2095 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2097 | /* choose the copy on our node/cpu, but dont care about preemption */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2098 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 2099 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 2101 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2102 | if (ret != 0) |
| 2103 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 2105 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 2106 | if (IS_ERR(new_table)) { |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2107 | ret = PTR_ERR(new_table); |
| 2108 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | } |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2110 | return new_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2112 | out_free: |
| 2113 | xt_free_table_info(newinfo); |
| 2114 | out: |
| 2115 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | } |
| 2117 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 2118 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2120 | struct xt_table_info *private; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2121 | void *loc_cpu_entry; |
Alexey Dobriyan | df20096 | 2008-01-31 04:05:34 -0800 | [diff] [blame] | 2122 | struct module *table_owner = table->me; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 2123 | struct ip6t_entry *iter; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2124 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2125 | private = xt_unregister_table(table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2126 | |
| 2127 | /* Decrease module usage counts and free resources */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2128 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 2129 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 2130 | cleanup_entry(iter, net); |
Alexey Dobriyan | df20096 | 2008-01-31 04:05:34 -0800 | [diff] [blame] | 2131 | if (private->number > private->initial_entries) |
| 2132 | module_put(table_owner); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2133 | xt_free_table_info(private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | } |
| 2135 | |
| 2136 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 2137 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
| 2139 | u_int8_t type, u_int8_t code, |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 2140 | bool invert) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | { |
| 2142 | return (type == test_type && code >= min_code && code <= max_code) |
| 2143 | ^ invert; |
| 2144 | } |
| 2145 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2146 | static bool |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 2147 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2148 | { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 2149 | const struct icmp6hdr *ic; |
| 2150 | struct icmp6hdr _icmph; |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2151 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | |
| 2153 | /* Must not be a fragment. */ |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2154 | if (par->fragoff != 0) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2155 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2157 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | if (ic == NULL) { |
| 2159 | /* We've been asked to examine this packet, and we |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2160 | * can't. Hence, no choice but to drop. |
| 2161 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | duprintf("Dropping evil ICMP tinygram.\n"); |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 2163 | par->hotdrop = true; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2164 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | } |
| 2166 | |
| 2167 | return icmp6_type_code_match(icmpinfo->type, |
| 2168 | icmpinfo->code[0], |
| 2169 | icmpinfo->code[1], |
| 2170 | ic->icmp6_type, ic->icmp6_code, |
| 2171 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); |
| 2172 | } |
| 2173 | |
| 2174 | /* Called when user tries to insert an entry of this type. */ |
Jan Engelhardt | b0f3845 | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 2175 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2177 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | |
Patrick McHardy | 7f93971 | 2006-03-20 18:01:43 -0800 | [diff] [blame] | 2179 | /* Must specify no unknown invflags */ |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 2180 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | } |
| 2182 | |
| 2183 | /* The built-in targets: standard (NULL) and error. */ |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2184 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
| 2185 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 2186 | .name = XT_STANDARD_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2187 | .targetsize = sizeof(int), |
| 2188 | .family = NFPROTO_IPV6, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 2189 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2190 | .compatsize = sizeof(compat_int_t), |
| 2191 | .compat_from_user = compat_standard_from_user, |
| 2192 | .compat_to_user = compat_standard_to_user, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 2193 | #endif |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2194 | }, |
| 2195 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 2196 | .name = XT_ERROR_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2197 | .target = ip6t_error, |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 2198 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2199 | .family = NFPROTO_IPV6, |
| 2200 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | }; |
| 2202 | |
| 2203 | static struct nf_sockopt_ops ip6t_sockopts = { |
| 2204 | .pf = PF_INET6, |
| 2205 | .set_optmin = IP6T_BASE_CTL, |
| 2206 | .set_optmax = IP6T_SO_SET_MAX+1, |
| 2207 | .set = do_ip6t_set_ctl, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 2208 | #ifdef CONFIG_COMPAT |
| 2209 | .compat_set = compat_do_ip6t_set_ctl, |
| 2210 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | .get_optmin = IP6T_BASE_CTL, |
| 2212 | .get_optmax = IP6T_SO_GET_MAX+1, |
| 2213 | .get = do_ip6t_get_ctl, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 2214 | #ifdef CONFIG_COMPAT |
| 2215 | .compat_get = compat_do_ip6t_get_ctl, |
| 2216 | #endif |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 2217 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | }; |
| 2219 | |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2220 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
| 2221 | { |
| 2222 | .name = "icmp6", |
| 2223 | .match = icmp6_match, |
| 2224 | .matchsize = sizeof(struct ip6t_icmp), |
| 2225 | .checkentry = icmp6_checkentry, |
| 2226 | .proto = IPPROTO_ICMPV6, |
| 2227 | .family = NFPROTO_IPV6, |
| 2228 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2229 | }; |
| 2230 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2231 | static int __net_init ip6_tables_net_init(struct net *net) |
| 2232 | { |
Jan Engelhardt | 383ca5b | 2009-04-14 14:24:21 +0200 | [diff] [blame] | 2233 | return xt_proto_init(net, NFPROTO_IPV6); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2234 | } |
| 2235 | |
| 2236 | static void __net_exit ip6_tables_net_exit(struct net *net) |
| 2237 | { |
Jan Engelhardt | 383ca5b | 2009-04-14 14:24:21 +0200 | [diff] [blame] | 2238 | xt_proto_fini(net, NFPROTO_IPV6); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2239 | } |
| 2240 | |
| 2241 | static struct pernet_operations ip6_tables_net_ops = { |
| 2242 | .init = ip6_tables_net_init, |
| 2243 | .exit = ip6_tables_net_exit, |
| 2244 | }; |
| 2245 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2246 | static int __init ip6_tables_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | { |
| 2248 | int ret; |
| 2249 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2250 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2251 | if (ret < 0) |
| 2252 | goto err1; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2253 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2254 | /* No one else will be downing sem now, so we won't sleep */ |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2255 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2256 | if (ret < 0) |
| 2257 | goto err2; |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2258 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2259 | if (ret < 0) |
| 2260 | goto err4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | |
| 2262 | /* Register setsockopt */ |
| 2263 | ret = nf_register_sockopt(&ip6t_sockopts); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2264 | if (ret < 0) |
| 2265 | goto err5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 2267 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2268 | return 0; |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2269 | |
| 2270 | err5: |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2271 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2272 | err4: |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2273 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2274 | err2: |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2275 | unregister_pernet_subsys(&ip6_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2276 | err1: |
| 2277 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | } |
| 2279 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2280 | static void __exit ip6_tables_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2281 | { |
| 2282 | nf_unregister_sockopt(&ip6t_sockopts); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2283 | |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2284 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
| 2285 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2286 | unregister_pernet_subsys(&ip6_tables_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | } |
| 2288 | |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2289 | /* |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2290 | * find the offset to specified header or the protocol number of last header |
| 2291 | * if target < 0. "last header" is transport protocol header, ESP, or |
| 2292 | * "No next header". |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2293 | * |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2294 | * If target header is found, its offset is set in *offset and return protocol |
| 2295 | * number. Otherwise, return -1. |
| 2296 | * |
Patrick McHardy | 6d38163 | 2006-10-24 16:15:10 -0700 | [diff] [blame] | 2297 | * If the first fragment doesn't contain the final protocol header or |
| 2298 | * NEXTHDR_NONE it is considered invalid. |
| 2299 | * |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2300 | * Note that non-1st fragment is special case that "the protocol number |
| 2301 | * of last header" is "next header" field in Fragment header. In this case, |
| 2302 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff |
| 2303 | * isn't NULL. |
| 2304 | * |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2305 | */ |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2306 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
| 2307 | int target, unsigned short *fragoff) |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2308 | { |
Arnaldo Carvalho de Melo | 6b88dd9 | 2007-03-19 22:29:03 -0300 | [diff] [blame] | 2309 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 2310 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2311 | unsigned int len = skb->len - start; |
| 2312 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2313 | if (fragoff) |
| 2314 | *fragoff = 0; |
| 2315 | |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2316 | while (nexthdr != target) { |
| 2317 | struct ipv6_opt_hdr _hdr, *hp; |
| 2318 | unsigned int hdrlen; |
| 2319 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2320 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
| 2321 | if (target < 0) |
| 2322 | break; |
Patrick McHardy | 6d38163 | 2006-10-24 16:15:10 -0700 | [diff] [blame] | 2323 | return -ENOENT; |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2324 | } |
| 2325 | |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2326 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
| 2327 | if (hp == NULL) |
Patrick McHardy | 6d38163 | 2006-10-24 16:15:10 -0700 | [diff] [blame] | 2328 | return -EBADMSG; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2329 | if (nexthdr == NEXTHDR_FRAGMENT) { |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 2330 | unsigned short _frag_off; |
| 2331 | __be16 *fp; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2332 | fp = skb_header_pointer(skb, |
| 2333 | start+offsetof(struct frag_hdr, |
| 2334 | frag_off), |
| 2335 | sizeof(_frag_off), |
| 2336 | &_frag_off); |
| 2337 | if (fp == NULL) |
Patrick McHardy | 6d38163 | 2006-10-24 16:15:10 -0700 | [diff] [blame] | 2338 | return -EBADMSG; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2339 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2340 | _frag_off = ntohs(*fp) & ~0x7; |
| 2341 | if (_frag_off) { |
| 2342 | if (target < 0 && |
| 2343 | ((!ipv6_ext_hdr(hp->nexthdr)) || |
Patrick McHardy | 337dde7 | 2006-11-14 19:49:13 -0800 | [diff] [blame] | 2344 | hp->nexthdr == NEXTHDR_NONE)) { |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2345 | if (fragoff) |
| 2346 | *fragoff = _frag_off; |
| 2347 | return hp->nexthdr; |
| 2348 | } |
Patrick McHardy | 6d38163 | 2006-10-24 16:15:10 -0700 | [diff] [blame] | 2349 | return -ENOENT; |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2350 | } |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2351 | hdrlen = 8; |
| 2352 | } else if (nexthdr == NEXTHDR_AUTH) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2353 | hdrlen = (hp->hdrlen + 2) << 2; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2354 | else |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2355 | hdrlen = ipv6_optlen(hp); |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2356 | |
| 2357 | nexthdr = hp->nexthdr; |
| 2358 | len -= hdrlen; |
| 2359 | start += hdrlen; |
| 2360 | } |
| 2361 | |
| 2362 | *offset = start; |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2363 | return nexthdr; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2364 | } |
| 2365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2366 | EXPORT_SYMBOL(ip6t_register_table); |
| 2367 | EXPORT_SYMBOL(ip6t_unregister_table); |
| 2368 | EXPORT_SYMBOL(ip6t_do_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | EXPORT_SYMBOL(ip6t_ext_hdr); |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2370 | EXPORT_SYMBOL(ipv6_find_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2372 | module_init(ip6_tables_init); |
| 2373 | module_exit(ip6_tables_fini); |