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> |
Patrick McHardy | f229f6c | 2013-04-06 15:24:29 +0200 | [diff] [blame] | 6 | * Copyright (c) 2006-2010 Patrick McHardy <kaber@trash.net> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
Joe Perches | a81b2ce | 2015-03-23 11:50:10 -0700 | [diff] [blame] | 12 | |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Joe Perches | a81b2ce | 2015-03-23 11:50:10 -0700 | [diff] [blame] | 14 | |
| 15 | #include <linux/kernel.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 16 | #include <linux/capability.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 17 | #include <linux/in.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/skbuff.h> |
| 19 | #include <linux/kmod.h> |
| 20 | #include <linux/vmalloc.h> |
| 21 | #include <linux/netdevice.h> |
| 22 | #include <linux/module.h> |
Randy Dunlap | 4bdbf6c | 2006-07-03 19:47:27 -0700 | [diff] [blame] | 23 | #include <linux/poison.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/icmpv6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <net/ipv6.h> |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 26 | #include <net/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <asm/uaccess.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 28 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/proc_fs.h> |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 30 | #include <linux/err.h> |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 31 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #include <linux/netfilter_ipv6/ip6_tables.h> |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 34 | #include <linux/netfilter/x_tables.h> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 35 | #include <net/netfilter/nf_log.h> |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 36 | #include "../../netfilter/xt_repldata.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | MODULE_LICENSE("GPL"); |
| 39 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 40 | MODULE_DESCRIPTION("IPv6 packet filter"); |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | /*#define DEBUG_IP_FIREWALL*/ |
| 43 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ |
| 44 | /*#define DEBUG_IP_FIREWALL_USER*/ |
| 45 | |
| 46 | #ifdef DEBUG_IP_FIREWALL |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 47 | #define dprintf(format, args...) pr_info(format , ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #else |
| 49 | #define dprintf(format, args...) |
| 50 | #endif |
| 51 | |
| 52 | #ifdef DEBUG_IP_FIREWALL_USER |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 53 | #define duprintf(format, args...) pr_info(format , ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #else |
| 55 | #define duprintf(format, args...) |
| 56 | #endif |
| 57 | |
| 58 | #ifdef CONFIG_NETFILTER_DEBUG |
Stephen Hemminger | af56760 | 2010-05-13 15:00:20 +0200 | [diff] [blame] | 59 | #define IP_NF_ASSERT(x) WARN_ON(!(x)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #else |
| 61 | #define IP_NF_ASSERT(x) |
| 62 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | #if 0 |
| 65 | /* All the better to debug you with... */ |
| 66 | #define static |
| 67 | #define inline |
| 68 | #endif |
| 69 | |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 70 | void *ip6t_alloc_initial_table(const struct xt_table *info) |
| 71 | { |
| 72 | return xt_alloc_initial_table(ip6t, IP6T); |
| 73 | } |
| 74 | EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table); |
| 75 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 76 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | 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] | 78 | them in the softirq when updating the counters and therefore |
| 79 | only need to read-lock in the softirq; doing a write_lock_bh() in user |
| 80 | context stops packets coming through and allows user context to read |
| 81 | the counters or update the rules. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | Hence the start of any table is given by get_table() below. */ |
| 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | /* Returns whether matches rule or not. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 86 | /* Performance critical - called for every packet */ |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 87 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | ip6_packet_match(const struct sk_buff *skb, |
| 89 | const char *indev, |
| 90 | const char *outdev, |
| 91 | const struct ip6t_ip6 *ip6info, |
| 92 | unsigned int *protoff, |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 93 | int *fragoff, bool *hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | unsigned long ret; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 96 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 98 | #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
Patrick McHardy | f2ffd9e | 2006-03-20 18:03:16 -0800 | [diff] [blame] | 100 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 101 | &ip6info->src), IP6T_INV_SRCIP) || |
| 102 | FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, |
| 103 | &ip6info->dst), IP6T_INV_DSTIP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | dprintf("Source or dest mismatch.\n"); |
| 105 | /* |
| 106 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, |
| 107 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, |
| 108 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); |
| 109 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, |
| 110 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, |
| 111 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 112 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | } |
| 114 | |
Eric Dumazet | b8dfe49 | 2009-03-25 17:31:52 +0100 | [diff] [blame] | 115 | ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
| 117 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { |
| 118 | dprintf("VIA in mismatch (%s vs %s).%s\n", |
| 119 | indev, ip6info->iniface, |
Ian Morris | 544d9b1 | 2015-10-11 17:32:18 +0100 | [diff] [blame] | 120 | ip6info->invflags & IP6T_INV_VIA_IN ? " (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(outdev, ip6info->outiface, ip6info->outiface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
| 126 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { |
| 127 | dprintf("VIA out mismatch (%s vs %s).%s\n", |
| 128 | outdev, ip6info->outiface, |
Ian Morris | 544d9b1 | 2015-10-11 17:32:18 +0100 | [diff] [blame] | 129 | ip6info->invflags & IP6T_INV_VIA_OUT ? " (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 | |
| 133 | /* ... might want to do something with class and flowlabel here ... */ |
| 134 | |
| 135 | /* look for the desired protocol header */ |
Ian Morris | 4305ae4 | 2015-10-11 17:32:19 +0100 | [diff] [blame] | 136 | if (ip6info->flags & IP6T_F_PROTO) { |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 137 | int protohdr; |
| 138 | unsigned short _frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Hans Schillstrom | 84018f5 | 2012-04-23 03:35:26 +0000 | [diff] [blame] | 140 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL); |
Patrick McHardy | 51d8b1a | 2006-10-24 16:14:04 -0700 | [diff] [blame] | 141 | if (protohdr < 0) { |
| 142 | if (_frag_off == 0) |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 143 | *hotdrop = true; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 144 | return false; |
Patrick McHardy | 51d8b1a | 2006-10-24 16:14:04 -0700 | [diff] [blame] | 145 | } |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 146 | *fragoff = _frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
| 148 | dprintf("Packet protocol %hi ?= %s%hi.\n", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 149 | protohdr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
| 151 | ip6info->proto); |
| 152 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 153 | if (ip6info->proto == protohdr) { |
Ian Morris | 4305ae4 | 2015-10-11 17:32:19 +0100 | [diff] [blame] | 154 | if (ip6info->invflags & IP6T_INV_PROTO) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 155 | return false; |
Ian Morris | 4305ae4 | 2015-10-11 17:32:19 +0100 | [diff] [blame] | 156 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 157 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | /* We need match for the '-p all', too! */ |
| 161 | if ((ip6info->proto != 0) && |
| 162 | !(ip6info->invflags & IP6T_INV_PROTO)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 163 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 165 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | /* should be ip6 safe */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 169 | static bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
| 171 | { |
| 172 | if (ipv6->flags & ~IP6T_F_MASK) { |
| 173 | duprintf("Unknown flag bits set: %08X\n", |
| 174 | ipv6->flags & ~IP6T_F_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 175 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | if (ipv6->invflags & ~IP6T_INV_MASK) { |
| 178 | duprintf("Unknown invflag bits set: %08X\n", |
| 179 | ipv6->invflags & ~IP6T_INV_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 180 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | } |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 182 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | static unsigned int |
Jan Engelhardt | 4b560b4 | 2009-07-05 19:43:26 +0200 | [diff] [blame] | 186 | ip6t_error(struct sk_buff *skb, const struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 188 | net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
| 190 | return NF_DROP; |
| 191 | } |
| 192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | static inline struct ip6t_entry * |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 194 | get_entry(const void *base, unsigned int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | { |
| 196 | return (struct ip6t_entry *)(base + offset); |
| 197 | } |
| 198 | |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 199 | /* All zeroes == unconditional rule. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 200 | /* Mildly perf critical (only if packet tracing is on) */ |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 201 | static inline bool unconditional(const struct ip6t_ip6 *ipv6) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 202 | { |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 203 | static const struct ip6t_ip6 uncond; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 204 | |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 205 | return memcmp(ipv6, &uncond, sizeof(uncond)) == 0; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 206 | } |
| 207 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 208 | static inline const struct xt_entry_target * |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 209 | ip6t_get_target_c(const struct ip6t_entry *e) |
| 210 | { |
| 211 | return ip6t_get_target((struct ip6t_entry *)e); |
| 212 | } |
| 213 | |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 214 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 215 | /* This cries for unification! */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 216 | static const char *const hooknames[] = { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 217 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
| 218 | [NF_INET_LOCAL_IN] = "INPUT", |
| 219 | [NF_INET_FORWARD] = "FORWARD", |
| 220 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
| 221 | [NF_INET_POST_ROUTING] = "POSTROUTING", |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 222 | }; |
| 223 | |
| 224 | enum nf_ip_trace_comments { |
| 225 | NF_IP6_TRACE_COMMENT_RULE, |
| 226 | NF_IP6_TRACE_COMMENT_RETURN, |
| 227 | NF_IP6_TRACE_COMMENT_POLICY, |
| 228 | }; |
| 229 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 230 | static const char *const comments[] = { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 231 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
| 232 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", |
| 233 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", |
| 234 | }; |
| 235 | |
| 236 | static struct nf_loginfo trace_loginfo = { |
| 237 | .type = NF_LOG_TYPE_LOG, |
| 238 | .u = { |
| 239 | .log = { |
Joe Perches | a81b2ce | 2015-03-23 11:50:10 -0700 | [diff] [blame] | 240 | .level = LOGLEVEL_WARNING, |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 241 | .logflags = NF_LOG_MASK, |
| 242 | }, |
| 243 | }, |
| 244 | }; |
| 245 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 246 | /* Mildly perf critical (only if packet tracing is on) */ |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 247 | static inline int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 248 | 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] | 249 | const char *hookname, const char **chainname, |
| 250 | const char **comment, unsigned int *rulenum) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 251 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 252 | const struct xt_standard_target *t = (void *)ip6t_get_target_c(s); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 253 | |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 254 | if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 255 | /* Head of user chain: ERROR target with chainname */ |
| 256 | *chainname = t->target.data; |
| 257 | (*rulenum) = 0; |
| 258 | } else if (s == e) { |
| 259 | (*rulenum)++; |
| 260 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 261 | if (s->target_offset == sizeof(struct ip6t_entry) && |
| 262 | strcmp(t->target.u.kernel.target->name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 263 | XT_STANDARD_TARGET) == 0 && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 264 | t->verdict < 0 && |
| 265 | unconditional(&s->ipv6)) { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 266 | /* Tail of chains: STANDARD target (return/policy) */ |
| 267 | *comment = *chainname == hookname |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 268 | ? comments[NF_IP6_TRACE_COMMENT_POLICY] |
| 269 | : comments[NF_IP6_TRACE_COMMENT_RETURN]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 270 | } |
| 271 | return 1; |
| 272 | } else |
| 273 | (*rulenum)++; |
| 274 | |
| 275 | return 0; |
| 276 | } |
| 277 | |
Eric W. Biederman | 9dff2c9 | 2015-09-15 20:04:17 -0500 | [diff] [blame] | 278 | static void trace_packet(struct net *net, |
| 279 | const struct sk_buff *skb, |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 280 | unsigned int hook, |
| 281 | const struct net_device *in, |
| 282 | const struct net_device *out, |
Jan Engelhardt | ecb6f85 | 2008-01-31 03:54:47 -0800 | [diff] [blame] | 283 | const char *tablename, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 284 | const struct xt_table_info *private, |
| 285 | const struct ip6t_entry *e) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 286 | { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 287 | const struct ip6t_entry *root; |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 288 | const char *hookname, *chainname, *comment; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 289 | const struct ip6t_entry *iter; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 290 | unsigned int rulenum = 0; |
| 291 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 292 | root = get_entry(private->entries, private->hook_entry[hook]); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 293 | |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 294 | hookname = chainname = hooknames[hook]; |
| 295 | comment = comments[NF_IP6_TRACE_COMMENT_RULE]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 296 | |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 297 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
| 298 | if (get_chainname_rulenum(iter, e, hookname, |
| 299 | &chainname, &comment, &rulenum) != 0) |
| 300 | break; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 301 | |
Pablo Neira Ayuso | 4017a7e | 2015-03-02 01:10:28 +0100 | [diff] [blame] | 302 | nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo, |
| 303 | "TRACE: %s:%s:%s:%u ", |
| 304 | tablename, chainname, comment, rulenum); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 305 | } |
| 306 | #endif |
| 307 | |
Florian Westphal | 6c7941d | 2015-07-14 17:51:10 +0200 | [diff] [blame] | 308 | static inline struct ip6t_entry * |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 309 | ip6t_next_entry(const struct ip6t_entry *entry) |
| 310 | { |
| 311 | return (void *)entry + entry->next_offset; |
| 312 | } |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
| 315 | unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 316 | ip6t_do_table(struct sk_buff *skb, |
David S. Miller | 8f8a371 | 2015-04-03 21:09:51 -0400 | [diff] [blame] | 317 | const struct nf_hook_state *state, |
Patrick McHardy | fe1cb10 | 2006-08-22 00:35:47 -0700 | [diff] [blame] | 318 | struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | { |
Eric W. Biederman | 6cb8ff3f1 | 2015-09-18 14:32:55 -0500 | [diff] [blame] | 320 | unsigned int hook = state->hook; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 321 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
| 323 | unsigned int verdict = NF_DROP; |
| 324 | const char *indev, *outdev; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 325 | const void *table_base; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 326 | struct ip6t_entry *e, **jumpstack; |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 327 | unsigned int stackidx, cpu; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 328 | const struct xt_table_info *private; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 329 | struct xt_action_param acpar; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 330 | unsigned int addend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
| 332 | /* Initialization */ |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 333 | stackidx = 0; |
David S. Miller | 8f8a371 | 2015-04-03 21:09:51 -0400 | [diff] [blame] | 334 | indev = state->in ? state->in->name : nulldevname; |
| 335 | outdev = state->out ? state->out->name : nulldevname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | /* We handle fragments by dealing with the first fragment as |
| 337 | * if it was a normal packet. All other fragments are treated |
| 338 | * normally, except that they will NEVER match rules that ask |
| 339 | * things we don't know, ie. tcp syn flag or ports). If the |
| 340 | * rule is also a fragment-specific rule, non-fragments won't |
| 341 | * match it. */ |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 342 | acpar.hotdrop = false; |
Eric W. Biederman | 156c196 | 2015-09-18 14:32:58 -0500 | [diff] [blame] | 343 | acpar.net = state->net; |
David S. Miller | 8f8a371 | 2015-04-03 21:09:51 -0400 | [diff] [blame] | 344 | acpar.in = state->in; |
| 345 | acpar.out = state->out; |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 346 | acpar.family = NFPROTO_IPV6; |
| 347 | acpar.hooknum = hook; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 350 | |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 351 | local_bh_disable(); |
| 352 | addend = xt_write_recseq_begin(); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 353 | private = table->private; |
Will Deacon | b416c14 | 2013-10-21 13:14:53 +0100 | [diff] [blame] | 354 | /* |
| 355 | * Ensure we load private-> members after we've fetched the base |
| 356 | * pointer. |
| 357 | */ |
| 358 | smp_read_barrier_depends(); |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 359 | cpu = smp_processor_id(); |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 360 | table_base = private->entries; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 361 | jumpstack = (struct ip6t_entry **)private->jumpstack[cpu]; |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 362 | |
| 363 | /* Switch to alternate jumpstack if we're being invoked via TEE. |
| 364 | * TEE issues XT_CONTINUE verdict on original skb so we must not |
| 365 | * clobber the jumpstack. |
| 366 | * |
| 367 | * For recursion via REJECT or SYNPROXY the stack will be clobbered |
| 368 | * but it is no problem since absolute verdict is issued by these. |
| 369 | */ |
Florian Westphal | dcebd31 | 2015-07-14 17:51:09 +0200 | [diff] [blame] | 370 | if (static_key_false(&xt_tee_enabled)) |
| 371 | jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated); |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 372 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 373 | e = get_entry(table_base, private->hook_entry[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | do { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 376 | const struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 377 | const struct xt_entry_match *ematch; |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 378 | struct xt_counters *counter; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | IP_NF_ASSERT(e); |
Hans Schillstrom | 84018f5 | 2012-04-23 03:35:26 +0000 | [diff] [blame] | 381 | acpar.thoff = 0; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 382 | if (!ip6_packet_match(skb, indev, outdev, &e->ipv6, |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 383 | &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 384 | no_match: |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 385 | e = ip6t_next_entry(e); |
| 386 | continue; |
| 387 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
Jan Engelhardt | ef53d70 | 2009-07-09 19:14:18 +0200 | [diff] [blame] | 389 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | de74c16 | 2009-07-05 18:26:37 +0200 | [diff] [blame] | 390 | acpar.match = ematch->u.kernel.match; |
| 391 | acpar.matchinfo = ematch->data; |
| 392 | if (!acpar.match->match(skb, &acpar)) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 393 | goto no_match; |
Jan Engelhardt | ef53d70 | 2009-07-09 19:14:18 +0200 | [diff] [blame] | 394 | } |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 395 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 396 | counter = xt_get_this_cpu_counter(&e->counters); |
| 397 | ADD_COUNTER(*counter, skb->len, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 399 | t = ip6t_get_target_c(e); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 400 | IP_NF_ASSERT(t->u.kernel.target); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 401 | |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 402 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 403 | /* The packet is traced: log it */ |
| 404 | if (unlikely(skb->nf_trace)) |
Eric W. Biederman | 9dff2c9 | 2015-09-15 20:04:17 -0500 | [diff] [blame] | 405 | trace_packet(state->net, skb, hook, state->in, |
| 406 | state->out, table->name, private, e); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 407 | #endif |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 408 | /* Standard target? */ |
| 409 | if (!t->u.kernel.target->target) { |
| 410 | int v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 412 | v = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 413 | if (v < 0) { |
| 414 | /* Pop from stack? */ |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 415 | if (v != XT_RETURN) { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 416 | verdict = (unsigned int)(-v) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | break; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 418 | } |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 419 | if (stackidx == 0) |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 420 | e = get_entry(table_base, |
| 421 | private->underflow[hook]); |
| 422 | else |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 423 | e = ip6t_next_entry(jumpstack[--stackidx]); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 424 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | } |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 426 | if (table_base + v != ip6t_next_entry(e) && |
| 427 | !(e->ipv6.flags & IP6T_F_GOTO)) { |
Florian Westphal | 7814b6e | 2015-07-14 17:51:08 +0200 | [diff] [blame] | 428 | jumpstack[stackidx++] = 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 | |
Ian Morris | 7695495 | 2015-10-11 17:32:16 +0100 | [diff] [blame] | 446 | xt_write_recseq_end(addend); |
| 447 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
| 449 | #ifdef DEBUG_ALLOW_ALL |
| 450 | return NF_ACCEPT; |
| 451 | #else |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 452 | if (acpar.hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | return NF_DROP; |
| 454 | else return verdict; |
| 455 | #endif |
| 456 | } |
| 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | /* Figures out from what hook each rule can be called: returns 0 if |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 459 | there are loops. Puts hook bitmask in comefrom. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | static int |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 461 | mark_source_chains(const struct xt_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 462 | unsigned int valid_hooks, void *entry0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | { |
| 464 | unsigned int hook; |
| 465 | |
| 466 | /* No recursion; use packet counter to save back ptrs (reset |
| 467 | to 0 as we leave), and comefrom to save source hook bitmask */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 468 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | unsigned int pos = newinfo->hook_entry[hook]; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 470 | struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
| 472 | if (!(valid_hooks & (1 << hook))) |
| 473 | continue; |
| 474 | |
| 475 | /* Set initial back pointer. */ |
| 476 | e->counters.pcnt = pos; |
| 477 | |
| 478 | for (;;) { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 479 | const struct xt_standard_target *t |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 480 | = (void *)ip6t_get_target_c(e); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 481 | int visited = e->comefrom & (1 << hook); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 483 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
Stephen Hemminger | 654d0fb | 2010-05-13 15:02:08 +0200 | [diff] [blame] | 484 | pr_err("iptables: loop hook %u pos %u %08X.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | hook, pos, e->comefrom); |
| 486 | return 0; |
| 487 | } |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 488 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | /* Unconditional return/END. */ |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 491 | if ((e->target_offset == sizeof(struct ip6t_entry) && |
| 492 | (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 493 | XT_STANDARD_TARGET) == 0) && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 494 | t->verdict < 0 && |
| 495 | unconditional(&e->ipv6)) || visited) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | unsigned int oldpos, size; |
| 497 | |
Patrick McHardy | 1f9352a | 2009-03-25 19:26:35 +0100 | [diff] [blame] | 498 | if ((strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 499 | XT_STANDARD_TARGET) == 0) && |
Patrick McHardy | 1f9352a | 2009-03-25 19:26:35 +0100 | [diff] [blame] | 500 | t->verdict < -NF_MAX_VERDICT - 1) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 501 | duprintf("mark_source_chains: bad " |
| 502 | "negative verdict (%i)\n", |
| 503 | t->verdict); |
| 504 | return 0; |
| 505 | } |
| 506 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | /* Return: backtrack through the last |
| 508 | big jump. */ |
| 509 | do { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 510 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | #ifdef DEBUG_IP_FIREWALL_USER |
| 512 | if (e->comefrom |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 513 | & (1 << NF_INET_NUMHOOKS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | duprintf("Back unset " |
| 515 | "on hook %u " |
| 516 | "rule %u\n", |
| 517 | hook, pos); |
| 518 | } |
| 519 | #endif |
| 520 | oldpos = pos; |
| 521 | pos = e->counters.pcnt; |
| 522 | e->counters.pcnt = 0; |
| 523 | |
| 524 | /* We're at the start. */ |
| 525 | if (pos == oldpos) |
| 526 | goto next; |
| 527 | |
| 528 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 529 | (entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | } while (oldpos == pos + e->next_offset); |
| 531 | |
| 532 | /* Move along one */ |
| 533 | size = e->next_offset; |
| 534 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 535 | (entry0 + pos + size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | e->counters.pcnt = pos; |
| 537 | pos += size; |
| 538 | } else { |
| 539 | int newpos = t->verdict; |
| 540 | |
| 541 | if (strcmp(t->target.u.user.name, |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 542 | XT_STANDARD_TARGET) == 0 && |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 543 | newpos >= 0) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 544 | if (newpos > newinfo->size - |
| 545 | sizeof(struct ip6t_entry)) { |
| 546 | duprintf("mark_source_chains: " |
| 547 | "bad verdict (%i)\n", |
| 548 | newpos); |
| 549 | return 0; |
| 550 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | /* This a jump; chase it. */ |
| 552 | duprintf("Jump rule %u -> %u\n", |
| 553 | pos, newpos); |
| 554 | } else { |
| 555 | /* ... this is a fallthru */ |
| 556 | newpos = pos + e->next_offset; |
| 557 | } |
| 558 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 559 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | e->counters.pcnt = pos; |
| 561 | pos = newpos; |
| 562 | } |
| 563 | } |
Ian Morris | 6ac9461 | 2015-10-11 17:32:14 +0100 | [diff] [blame] | 564 | next: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | duprintf("Finished chain %u\n", hook); |
| 566 | } |
| 567 | return 1; |
| 568 | } |
| 569 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 570 | static void cleanup_match(struct xt_entry_match *m, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | { |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 572 | struct xt_mtdtor_param par; |
| 573 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 574 | par.net = net; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 575 | par.match = m->u.kernel.match; |
| 576 | par.matchinfo = m->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 577 | par.family = NFPROTO_IPV6; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 578 | if (par.match->destroy != NULL) |
| 579 | par.match->destroy(&par); |
| 580 | module_put(par.match->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | } |
| 582 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 583 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 584 | check_entry(const struct ip6t_entry *e, const char *name) |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 585 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 586 | const struct xt_entry_target *t; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 587 | |
| 588 | if (!ip6_checkentry(&e->ipv6)) { |
| 589 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); |
| 590 | return -EINVAL; |
| 591 | } |
| 592 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 593 | if (e->target_offset + sizeof(struct xt_entry_target) > |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 594 | e->next_offset) |
| 595 | return -EINVAL; |
| 596 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 597 | t = ip6t_get_target_c(e); |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 598 | if (e->target_offset + t->u.target_size > e->next_offset) |
| 599 | return -EINVAL; |
| 600 | |
| 601 | return 0; |
| 602 | } |
| 603 | |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 604 | 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] | 605 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 606 | const struct ip6t_ip6 *ipv6 = par->entryinfo; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 607 | int ret; |
| 608 | |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 609 | par->match = m->u.kernel.match; |
| 610 | par->matchinfo = m->data; |
| 611 | |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 612 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 613 | ipv6->proto, ipv6->invflags & IP6T_INV_PROTO); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 614 | if (ret < 0) { |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 615 | duprintf("ip_tables: check failed for `%s'.\n", |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 616 | par.match->name); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 617 | return ret; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 618 | } |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 619 | return 0; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 620 | } |
| 621 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 622 | static int |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 623 | 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] | 624 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 625 | struct xt_match *match; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 626 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 628 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
| 629 | m->u.user.revision); |
| 630 | if (IS_ERR(match)) { |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 631 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 632 | return PTR_ERR(match); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | } |
| 634 | m->u.kernel.match = match; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 636 | ret = check_match(m, par); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 637 | if (ret) |
| 638 | goto err; |
| 639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 641 | err: |
| 642 | module_put(m->u.kernel.match->me); |
| 643 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | } |
| 645 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 646 | 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] | 647 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 648 | struct xt_entry_target *t = ip6t_get_target(e); |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 649 | struct xt_tgchk_param par = { |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 650 | .net = net, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 651 | .table = name, |
| 652 | .entryinfo = e, |
| 653 | .target = t->u.kernel.target, |
| 654 | .targinfo = t->data, |
| 655 | .hook_mask = e->comefrom, |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 656 | .family = NFPROTO_IPV6, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 657 | }; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 658 | int ret; |
| 659 | |
| 660 | t = ip6t_get_target(e); |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 661 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 662 | e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 663 | if (ret < 0) { |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 664 | duprintf("ip_tables: check failed for `%s'.\n", |
| 665 | t->u.kernel.target->name); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 666 | return ret; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 667 | } |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 668 | return 0; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 669 | } |
| 670 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 671 | static int |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 672 | 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] | 673 | unsigned int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 675 | struct xt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 676 | struct xt_target *target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | int ret; |
| 678 | unsigned int j; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 679 | struct xt_mtchk_param mtpar; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 680 | struct xt_entry_match *ematch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 682 | ret = check_entry(e, name); |
| 683 | if (ret) |
| 684 | return ret; |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 685 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 686 | e->counters.pcnt = xt_percpu_counter_alloc(); |
| 687 | if (IS_ERR_VALUE(e->counters.pcnt)) |
| 688 | return -ENOMEM; |
| 689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | j = 0; |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 691 | mtpar.net = net; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 692 | mtpar.table = name; |
| 693 | mtpar.entryinfo = &e->ipv6; |
| 694 | mtpar.hook_mask = e->comefrom; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 695 | mtpar.family = NFPROTO_IPV6; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 696 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 697 | ret = find_check_match(ematch, &mtpar); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 698 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 699 | goto cleanup_matches; |
| 700 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 701 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
| 703 | t = ip6t_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 704 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
| 705 | t->u.user.revision); |
| 706 | if (IS_ERR(target)) { |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 707 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 708 | ret = PTR_ERR(target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | goto cleanup_matches; |
| 710 | } |
| 711 | t->u.kernel.target = target; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 712 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 713 | ret = check_target(e, net, name); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 714 | if (ret) |
| 715 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 717 | err: |
| 718 | module_put(t->u.kernel.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | cleanup_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 720 | xt_ematch_foreach(ematch, e) { |
| 721 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 722 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 723 | cleanup_match(ematch, net); |
| 724 | } |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 725 | |
| 726 | xt_percpu_counter_free(e->counters.pcnt); |
| 727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | return ret; |
| 729 | } |
| 730 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 731 | static bool check_underflow(const struct ip6t_entry *e) |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 732 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 733 | const struct xt_entry_target *t; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 734 | unsigned int verdict; |
| 735 | |
| 736 | if (!unconditional(&e->ipv6)) |
| 737 | return false; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 738 | t = ip6t_get_target_c(e); |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 739 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
| 740 | return false; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 741 | verdict = ((struct xt_standard_target *)t)->verdict; |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 742 | verdict = -verdict - 1; |
| 743 | return verdict == NF_DROP || verdict == NF_ACCEPT; |
| 744 | } |
| 745 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 746 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | check_entry_size_and_hooks(struct ip6t_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 748 | struct xt_table_info *newinfo, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 749 | const unsigned char *base, |
| 750 | const unsigned char *limit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | const unsigned int *hook_entries, |
| 752 | const unsigned int *underflows, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 753 | unsigned int valid_hooks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | { |
| 755 | unsigned int h; |
| 756 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 757 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 || |
| 758 | (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | duprintf("Bad offset %p\n", e); |
| 760 | return -EINVAL; |
| 761 | } |
| 762 | |
| 763 | if (e->next_offset |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 764 | < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | duprintf("checking: element %p size %u\n", |
| 766 | e, e->next_offset); |
| 767 | return -EINVAL; |
| 768 | } |
| 769 | |
| 770 | /* Check hooks & underflows */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 771 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Jan Engelhardt | a7d5173 | 2009-07-18 14:52:58 +0200 | [diff] [blame] | 772 | if (!(valid_hooks & (1 << h))) |
| 773 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | if ((unsigned char *)e - base == hook_entries[h]) |
| 775 | newinfo->hook_entry[h] = hook_entries[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 776 | if ((unsigned char *)e - base == underflows[h]) { |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 777 | if (!check_underflow(e)) { |
| 778 | pr_err("Underflows must be unconditional and " |
| 779 | "use the STANDARD target with " |
| 780 | "ACCEPT/DROP\n"); |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 781 | return -EINVAL; |
| 782 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | newinfo->underflow[h] = underflows[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 784 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | } |
| 786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | /* Clear counters and comefrom */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 788 | e->counters = ((struct xt_counters) { 0, 0 }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | e->comefrom = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | return 0; |
| 791 | } |
| 792 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 793 | static void cleanup_entry(struct ip6t_entry *e, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | { |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 795 | struct xt_tgdtor_param par; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 796 | struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 797 | struct xt_entry_match *ematch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | /* Cleanup all matches */ |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 800 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 801 | cleanup_match(ematch, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | t = ip6t_get_target(e); |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 803 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 804 | par.net = net; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 805 | par.target = t->u.kernel.target; |
| 806 | par.targinfo = t->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 807 | par.family = NFPROTO_IPV6; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 808 | if (par.target->destroy != NULL) |
| 809 | par.target->destroy(&par); |
| 810 | module_put(par.target->me); |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 811 | |
| 812 | xt_percpu_counter_free(e->counters.pcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | } |
| 814 | |
| 815 | /* Checks and translates the user-supplied table segment (held in |
| 816 | newinfo) */ |
| 817 | static int |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 818 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
Ian Morris | cda219c | 2015-10-11 17:32:15 +0100 | [diff] [blame] | 819 | const struct ip6t_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 821 | struct ip6t_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | unsigned int i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 823 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 825 | newinfo->size = repl->size; |
| 826 | newinfo->number = repl->num_entries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
| 828 | /* Init all hooks to impossible value. */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 829 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
| 831 | newinfo->underflow[i] = 0xFFFFFFFF; |
| 832 | } |
| 833 | |
| 834 | duprintf("translate_table: size %u\n", newinfo->size); |
| 835 | i = 0; |
| 836 | /* Walk through entries, checking offsets. */ |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 837 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 838 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 839 | entry0 + repl->size, |
| 840 | repl->hook_entry, |
| 841 | repl->underflow, |
| 842 | repl->valid_hooks); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 843 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 844 | return ret; |
| 845 | ++i; |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 846 | if (strcmp(ip6t_get_target(iter)->u.user.name, |
| 847 | XT_ERROR_TARGET) == 0) |
| 848 | ++newinfo->stacksize; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 849 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 851 | if (i != repl->num_entries) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | duprintf("translate_table: %u not %u entries\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 853 | i, repl->num_entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | return -EINVAL; |
| 855 | } |
| 856 | |
| 857 | /* Check hooks all assigned */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 858 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | /* Only hooks which are valid */ |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 860 | if (!(repl->valid_hooks & (1 << i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | continue; |
| 862 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { |
| 863 | duprintf("Invalid hook entry %u %u\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 864 | i, repl->hook_entry[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | return -EINVAL; |
| 866 | } |
| 867 | if (newinfo->underflow[i] == 0xFFFFFFFF) { |
| 868 | duprintf("Invalid underflow %u %u\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 869 | i, repl->underflow[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | return -EINVAL; |
| 871 | } |
| 872 | } |
| 873 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 874 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 875 | return -ELOOP; |
| 876 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | /* Finally, each sanity check must pass */ |
| 878 | i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 879 | xt_entry_foreach(iter, entry0, newinfo->size) { |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 880 | ret = find_check_entry(iter, net, repl->name, repl->size); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 881 | if (ret != 0) |
| 882 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 883 | ++i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 884 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 886 | if (ret != 0) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 887 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 888 | if (i-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 889 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 890 | cleanup_entry(iter, net); |
| 891 | } |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 892 | return ret; |
| 893 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 895 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } |
| 897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | static void |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 899 | get_counters(const struct xt_table_info *t, |
| 900 | struct xt_counters counters[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 902 | struct ip6t_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | unsigned int cpu; |
| 904 | unsigned int i; |
| 905 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 906 | for_each_possible_cpu(cpu) { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 907 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 908 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | i = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 910 | xt_entry_foreach(iter, t->entries, t->size) { |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 911 | struct xt_counters *tmp; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 912 | u64 bcnt, pcnt; |
| 913 | unsigned int start; |
| 914 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 915 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 916 | do { |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 917 | start = read_seqcount_begin(s); |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 918 | bcnt = tmp->bcnt; |
| 919 | pcnt = tmp->pcnt; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 920 | } while (read_seqcount_retry(s, start)); |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 921 | |
| 922 | ADD_COUNTER(counters[i], bcnt, pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 923 | ++i; |
| 924 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | } |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 926 | } |
| 927 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 928 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | { |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 930 | unsigned int countersize; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 931 | struct xt_counters *counters; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 932 | const struct xt_table_info *private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
| 934 | /* We need atomic snapshot of counters: rest doesn't change |
| 935 | (other than comefrom, which userspace doesn't care |
| 936 | about). */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 937 | countersize = sizeof(struct xt_counters) * private->number; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 938 | counters = vzalloc(countersize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | |
| 940 | if (counters == NULL) |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 941 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 943 | get_counters(private, counters); |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 944 | |
Eric Dumazet | 49a88d1 | 2009-04-06 17:06:55 +0200 | [diff] [blame] | 945 | return counters; |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 946 | } |
| 947 | |
| 948 | static int |
| 949 | copy_entries_to_user(unsigned int total_size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 950 | const struct xt_table *table, |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 951 | void __user *userptr) |
| 952 | { |
| 953 | unsigned int off, num; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 954 | const struct ip6t_entry *e; |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 955 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 956 | const struct xt_table_info *private = table->private; |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 957 | int ret = 0; |
Eric Dumazet | 711bdde | 2015-06-15 09:57:30 -0700 | [diff] [blame] | 958 | const void *loc_cpu_entry; |
Patrick McHardy | ed1a6f5 | 2007-12-17 21:49:51 -0800 | [diff] [blame] | 959 | |
| 960 | counters = alloc_counters(table); |
| 961 | if (IS_ERR(counters)) |
| 962 | return PTR_ERR(counters); |
| 963 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 964 | loc_cpu_entry = private->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 965 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | ret = -EFAULT; |
| 967 | goto free_counters; |
| 968 | } |
| 969 | |
| 970 | /* FIXME: use iterator macros --RR */ |
| 971 | /* ... then go back and fix counters and names */ |
| 972 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ |
| 973 | unsigned int i; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 974 | const struct xt_entry_match *m; |
| 975 | const struct xt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 977 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | if (copy_to_user(userptr + off |
| 979 | + offsetof(struct ip6t_entry, counters), |
| 980 | &counters[num], |
| 981 | sizeof(counters[num])) != 0) { |
| 982 | ret = -EFAULT; |
| 983 | goto free_counters; |
| 984 | } |
| 985 | |
| 986 | for (i = sizeof(struct ip6t_entry); |
| 987 | i < e->target_offset; |
| 988 | i += m->u.match_size) { |
| 989 | m = (void *)e + i; |
| 990 | |
| 991 | if (copy_to_user(userptr + off + i |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 992 | + offsetof(struct xt_entry_match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | u.user.name), |
| 994 | m->u.kernel.match->name, |
| 995 | strlen(m->u.kernel.match->name)+1) |
| 996 | != 0) { |
| 997 | ret = -EFAULT; |
| 998 | goto free_counters; |
| 999 | } |
| 1000 | } |
| 1001 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1002 | t = ip6t_get_target_c(e); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | if (copy_to_user(userptr + off + e->target_offset |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1004 | + offsetof(struct xt_entry_target, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | u.user.name), |
| 1006 | t->u.kernel.target->name, |
| 1007 | strlen(t->u.kernel.target->name)+1) != 0) { |
| 1008 | ret = -EFAULT; |
| 1009 | goto free_counters; |
| 1010 | } |
| 1011 | } |
| 1012 | |
| 1013 | free_counters: |
| 1014 | vfree(counters); |
| 1015 | return ret; |
| 1016 | } |
| 1017 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1018 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 1019 | static void compat_standard_from_user(void *dst, const void *src) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1020 | { |
| 1021 | int v = *(compat_int_t *)src; |
| 1022 | |
| 1023 | if (v > 0) |
| 1024 | v += xt_compat_calc_jump(AF_INET6, v); |
| 1025 | memcpy(dst, &v, sizeof(v)); |
| 1026 | } |
| 1027 | |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 1028 | static int compat_standard_to_user(void __user *dst, const void *src) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1029 | { |
| 1030 | compat_int_t cv = *(int *)src; |
| 1031 | |
| 1032 | if (cv > 0) |
| 1033 | cv -= xt_compat_calc_jump(AF_INET6, cv); |
| 1034 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
| 1035 | } |
| 1036 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1037 | static int compat_calc_entry(const struct ip6t_entry *e, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1038 | const struct xt_table_info *info, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1039 | const void *base, struct xt_table_info *newinfo) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1040 | { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1041 | const struct xt_entry_match *ematch; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1042 | const struct xt_entry_target *t; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1043 | unsigned int entry_offset; |
| 1044 | int off, i, ret; |
| 1045 | |
| 1046 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); |
| 1047 | entry_offset = (void *)e - base; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1048 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1049 | off += xt_compat_match_offset(ematch->u.kernel.match); |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1050 | t = ip6t_get_target_c(e); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1051 | off += xt_compat_target_offset(t->u.kernel.target); |
| 1052 | newinfo->size -= off; |
| 1053 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); |
| 1054 | if (ret) |
| 1055 | return ret; |
| 1056 | |
| 1057 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
| 1058 | if (info->hook_entry[i] && |
| 1059 | (e < (struct ip6t_entry *)(base + info->hook_entry[i]))) |
| 1060 | newinfo->hook_entry[i] -= off; |
| 1061 | if (info->underflow[i] && |
| 1062 | (e < (struct ip6t_entry *)(base + info->underflow[i]))) |
| 1063 | newinfo->underflow[i] -= off; |
| 1064 | } |
| 1065 | return 0; |
| 1066 | } |
| 1067 | |
| 1068 | static int compat_table_info(const struct xt_table_info *info, |
| 1069 | struct xt_table_info *newinfo) |
| 1070 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1071 | struct ip6t_entry *iter; |
Eric Dumazet | 711bdde | 2015-06-15 09:57:30 -0700 | [diff] [blame] | 1072 | const void *loc_cpu_entry; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1073 | int ret; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1074 | |
| 1075 | if (!newinfo || !info) |
| 1076 | return -EINVAL; |
| 1077 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1078 | /* we dont care about newinfo->entries */ |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1079 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
| 1080 | newinfo->initial_entries = 0; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1081 | loc_cpu_entry = info->entries; |
Eric Dumazet | 255d0dc | 2010-12-18 18:35:15 +0100 | [diff] [blame] | 1082 | xt_compat_init_offsets(AF_INET6, info->number); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1083 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
| 1084 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); |
| 1085 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1086 | return ret; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1087 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1088 | return 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1089 | } |
| 1090 | #endif |
| 1091 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1092 | static int get_info(struct net *net, void __user *user, |
Ian Morris | cda219c | 2015-10-11 17:32:15 +0100 | [diff] [blame] | 1093 | const int *len, int compat) |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1094 | { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1095 | char name[XT_TABLE_MAXNAMELEN]; |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1096 | struct xt_table *t; |
| 1097 | int ret; |
| 1098 | |
| 1099 | if (*len != sizeof(struct ip6t_getinfo)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1100 | duprintf("length %u != %zu\n", *len, |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1101 | sizeof(struct ip6t_getinfo)); |
| 1102 | return -EINVAL; |
| 1103 | } |
| 1104 | |
| 1105 | if (copy_from_user(name, user, sizeof(name)) != 0) |
| 1106 | return -EFAULT; |
| 1107 | |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1108 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1109 | #ifdef CONFIG_COMPAT |
| 1110 | if (compat) |
| 1111 | xt_compat_lock(AF_INET6); |
| 1112 | #endif |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1113 | 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] | 1114 | "ip6table_%s", name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1115 | if (!IS_ERR_OR_NULL(t)) { |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1116 | struct ip6t_getinfo info; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1117 | const struct xt_table_info *private = t->private; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1118 | #ifdef CONFIG_COMPAT |
Alexey Dobriyan | 14c7dbe | 2010-02-08 11:17:43 -0800 | [diff] [blame] | 1119 | struct xt_table_info tmp; |
| 1120 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1121 | if (compat) { |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1122 | ret = compat_table_info(private, &tmp); |
| 1123 | xt_compat_flush_offsets(AF_INET6); |
| 1124 | private = &tmp; |
| 1125 | } |
| 1126 | #endif |
Jan Engelhardt | cccbe5e | 2010-11-03 18:55:39 -0700 | [diff] [blame] | 1127 | memset(&info, 0, sizeof(info)); |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1128 | info.valid_hooks = t->valid_hooks; |
| 1129 | memcpy(info.hook_entry, private->hook_entry, |
| 1130 | sizeof(info.hook_entry)); |
| 1131 | memcpy(info.underflow, private->underflow, |
| 1132 | sizeof(info.underflow)); |
| 1133 | info.num_entries = private->number; |
| 1134 | info.size = private->size; |
Patrick McHardy | b5dd674 | 2007-12-17 21:52:35 -0800 | [diff] [blame] | 1135 | strcpy(info.name, name); |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1136 | |
| 1137 | if (copy_to_user(user, &info, *len) != 0) |
| 1138 | ret = -EFAULT; |
| 1139 | else |
| 1140 | ret = 0; |
| 1141 | |
| 1142 | xt_table_unlock(t); |
| 1143 | module_put(t->me); |
| 1144 | } else |
| 1145 | ret = t ? PTR_ERR(t) : -ENOENT; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1146 | #ifdef CONFIG_COMPAT |
| 1147 | if (compat) |
| 1148 | xt_compat_unlock(AF_INET6); |
| 1149 | #endif |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 1150 | return ret; |
| 1151 | } |
| 1152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1154 | get_entries(struct net *net, struct ip6t_get_entries __user *uptr, |
Ian Morris | cda219c | 2015-10-11 17:32:15 +0100 | [diff] [blame] | 1155 | const int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | { |
| 1157 | int ret; |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 1158 | struct ip6t_get_entries get; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1159 | struct xt_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 1161 | if (*len < sizeof(get)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1162 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 1163 | return -EINVAL; |
| 1164 | } |
| 1165 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1166 | return -EFAULT; |
| 1167 | if (*len != sizeof(struct ip6t_get_entries) + get.size) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1168 | duprintf("get_entries: %u != %zu\n", |
| 1169 | *len, sizeof(get) + get.size); |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 1170 | return -EINVAL; |
| 1171 | } |
| 1172 | |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1173 | t = xt_find_table_lock(net, AF_INET6, get.name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1174 | if (!IS_ERR_OR_NULL(t)) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1175 | struct xt_table_info *private = t->private; |
| 1176 | duprintf("t->private->number = %u\n", private->number); |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 1177 | if (get.size == private->size) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1178 | ret = copy_entries_to_user(private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | t, uptr->entrytable); |
| 1180 | else { |
| 1181 | duprintf("get_entries: I've got %u not %u!\n", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1182 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1183 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | } |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1185 | module_put(t->me); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1186 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | } else |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1188 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | |
| 1190 | return ret; |
| 1191 | } |
| 1192 | |
| 1193 | static int |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1194 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1195 | struct xt_table_info *newinfo, unsigned int num_counters, |
| 1196 | void __user *counters_ptr) |
| 1197 | { |
| 1198 | int ret; |
| 1199 | struct xt_table *t; |
| 1200 | struct xt_table_info *oldinfo; |
| 1201 | struct xt_counters *counters; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1202 | struct ip6t_entry *iter; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1203 | |
| 1204 | ret = 0; |
Eric Dumazet | 83723d6 | 2011-01-10 20:11:38 +0100 | [diff] [blame] | 1205 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1206 | if (!counters) { |
| 1207 | ret = -ENOMEM; |
| 1208 | goto out; |
| 1209 | } |
| 1210 | |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1211 | 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] | 1212 | "ip6table_%s", name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1213 | if (IS_ERR_OR_NULL(t)) { |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1214 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1215 | goto free_newinfo_counters_untrans; |
| 1216 | } |
| 1217 | |
| 1218 | /* You lied! */ |
| 1219 | if (valid_hooks != t->valid_hooks) { |
| 1220 | duprintf("Valid hook crap: %08X vs %08X\n", |
| 1221 | valid_hooks, t->valid_hooks); |
| 1222 | ret = -EINVAL; |
| 1223 | goto put_module; |
| 1224 | } |
| 1225 | |
| 1226 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
| 1227 | if (!oldinfo) |
| 1228 | goto put_module; |
| 1229 | |
| 1230 | /* Update module usage count based on number of rules */ |
| 1231 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", |
| 1232 | oldinfo->number, oldinfo->initial_entries, newinfo->number); |
| 1233 | if ((oldinfo->number > oldinfo->initial_entries) || |
| 1234 | (newinfo->number <= oldinfo->initial_entries)) |
| 1235 | module_put(t->me); |
| 1236 | if ((oldinfo->number > oldinfo->initial_entries) && |
| 1237 | (newinfo->number <= oldinfo->initial_entries)) |
| 1238 | module_put(t->me); |
| 1239 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1240 | /* Get the old counters, and synchronize with replace */ |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1241 | get_counters(oldinfo, counters); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1242 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1243 | /* Decrease module usage counts and free resource */ |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1244 | xt_entry_foreach(iter, oldinfo->entries, oldinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1245 | cleanup_entry(iter, net); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1246 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1247 | xt_free_table_info(oldinfo); |
| 1248 | if (copy_to_user(counters_ptr, counters, |
Thomas Graf | c58dd2d | 2014-04-04 17:57:45 +0200 | [diff] [blame] | 1249 | sizeof(struct xt_counters) * num_counters) != 0) { |
| 1250 | /* Silent error, can't fail, new table is already in place */ |
| 1251 | net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n"); |
| 1252 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1253 | vfree(counters); |
| 1254 | xt_table_unlock(t); |
| 1255 | return ret; |
| 1256 | |
| 1257 | put_module: |
| 1258 | module_put(t->me); |
| 1259 | xt_table_unlock(t); |
| 1260 | free_newinfo_counters_untrans: |
| 1261 | vfree(counters); |
| 1262 | out: |
| 1263 | return ret; |
| 1264 | } |
| 1265 | |
| 1266 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1267 | do_replace(struct net *net, const void __user *user, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | { |
| 1269 | int ret; |
| 1270 | struct ip6t_replace tmp; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1271 | struct xt_table_info *newinfo; |
| 1272 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1273 | struct ip6t_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | |
| 1275 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1276 | return -EFAULT; |
| 1277 | |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1278 | /* overflow check */ |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1279 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1280 | return -ENOMEM; |
Dave Jones | 1086bbe | 2015-05-19 20:55:17 -0400 | [diff] [blame] | 1281 | if (tmp.num_counters == 0) |
| 1282 | return -EINVAL; |
| 1283 | |
Vasiliy Kulikov | 6a8ab060 | 2011-03-15 13:37:13 +0100 | [diff] [blame] | 1284 | tmp.name[sizeof(tmp.name)-1] = 0; |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1285 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1286 | newinfo = xt_alloc_table_info(tmp.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | if (!newinfo) |
| 1288 | return -ENOMEM; |
| 1289 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1290 | loc_cpu_entry = newinfo->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1291 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | tmp.size) != 0) { |
| 1293 | ret = -EFAULT; |
| 1294 | goto free_newinfo; |
| 1295 | } |
| 1296 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 1297 | ret = translate_table(net, newinfo, loc_cpu_entry, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | if (ret != 0) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1299 | goto free_newinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | |
| 1301 | duprintf("ip_tables: Translated table\n"); |
| 1302 | |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1303 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1304 | tmp.num_counters, tmp.counters); |
| 1305 | if (ret) |
| 1306 | goto free_newinfo_untrans; |
| 1307 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1309 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1310 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1311 | cleanup_entry(iter, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | free_newinfo: |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1313 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | return ret; |
| 1315 | } |
| 1316 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1318 | 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] | 1319 | int compat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | { |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1321 | unsigned int i; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1322 | struct xt_counters_info tmp; |
| 1323 | struct xt_counters *paddc; |
| 1324 | unsigned int num_counters; |
| 1325 | char *name; |
| 1326 | int size; |
| 1327 | void *ptmp; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1328 | struct xt_table *t; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1329 | const struct xt_table_info *private; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1330 | int ret = 0; |
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); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1373 | if (IS_ERR_OR_NULL(t)) { |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 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 | local_bh_disable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1379 | private = t->private; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1380 | if (private->number != num_counters) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | ret = -EINVAL; |
| 1382 | goto unlock_up_free; |
| 1383 | } |
| 1384 | |
| 1385 | i = 0; |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1386 | addend = xt_write_recseq_begin(); |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1387 | xt_entry_foreach(iter, private->entries, private->size) { |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 1388 | struct xt_counters *tmp; |
| 1389 | |
| 1390 | tmp = xt_get_this_cpu_counter(&iter->counters); |
| 1391 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1392 | ++i; |
| 1393 | } |
Eric Dumazet | 7f5c6d4 | 2011-04-04 17:04:03 +0200 | [diff] [blame] | 1394 | xt_write_recseq_end(addend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | unlock_up_free: |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1396 | local_bh_enable(); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1397 | xt_table_unlock(t); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1398 | module_put(t->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | free: |
| 1400 | vfree(paddc); |
| 1401 | |
| 1402 | return ret; |
| 1403 | } |
| 1404 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1405 | #ifdef CONFIG_COMPAT |
| 1406 | struct compat_ip6t_replace { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1407 | char name[XT_TABLE_MAXNAMELEN]; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1408 | u32 valid_hooks; |
| 1409 | u32 num_entries; |
| 1410 | u32 size; |
| 1411 | u32 hook_entry[NF_INET_NUMHOOKS]; |
| 1412 | u32 underflow[NF_INET_NUMHOOKS]; |
| 1413 | u32 num_counters; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1414 | compat_uptr_t counters; /* struct xt_counters * */ |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1415 | struct compat_ip6t_entry entries[0]; |
| 1416 | }; |
| 1417 | |
| 1418 | static int |
| 1419 | compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1420 | unsigned int *size, struct xt_counters *counters, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1421 | unsigned int i) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1422 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1423 | struct xt_entry_target *t; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1424 | struct compat_ip6t_entry __user *ce; |
| 1425 | u_int16_t target_offset, next_offset; |
| 1426 | compat_uint_t origsize; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1427 | const struct xt_entry_match *ematch; |
| 1428 | int ret = 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1429 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1430 | origsize = *size; |
| 1431 | ce = (struct compat_ip6t_entry __user *)*dstptr; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1432 | if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 || |
| 1433 | copy_to_user(&ce->counters, &counters[i], |
| 1434 | sizeof(counters[i])) != 0) |
| 1435 | return -EFAULT; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1436 | |
| 1437 | *dstptr += sizeof(struct compat_ip6t_entry); |
| 1438 | *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); |
| 1439 | |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1440 | xt_ematch_foreach(ematch, e) { |
| 1441 | ret = xt_compat_match_to_user(ematch, dstptr, size); |
| 1442 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1443 | return ret; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1444 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1445 | target_offset = e->target_offset - (origsize - *size); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1446 | t = ip6t_get_target(e); |
| 1447 | ret = xt_compat_target_to_user(t, dstptr, size); |
| 1448 | if (ret) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1449 | return ret; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1450 | next_offset = e->next_offset - (origsize - *size); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1451 | if (put_user(target_offset, &ce->target_offset) != 0 || |
| 1452 | put_user(next_offset, &ce->next_offset) != 0) |
| 1453 | return -EFAULT; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1454 | return 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1455 | } |
| 1456 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1457 | static int |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1458 | compat_find_calc_match(struct xt_entry_match *m, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1459 | const char *name, |
| 1460 | const struct ip6t_ip6 *ipv6, |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1461 | int *size) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1462 | { |
| 1463 | struct xt_match *match; |
| 1464 | |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 1465 | match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name, |
| 1466 | m->u.user.revision); |
| 1467 | if (IS_ERR(match)) { |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1468 | duprintf("compat_check_calc_match: `%s' not found\n", |
| 1469 | m->u.user.name); |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 1470 | return PTR_ERR(match); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1471 | } |
| 1472 | m->u.kernel.match = match; |
| 1473 | *size += xt_compat_match_offset(match); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1474 | return 0; |
| 1475 | } |
| 1476 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1477 | static void compat_release_entry(struct compat_ip6t_entry *e) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1478 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1479 | struct xt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1480 | struct xt_entry_match *ematch; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1481 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1482 | /* Cleanup all matches */ |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1483 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1484 | module_put(ematch->u.kernel.match->me); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1485 | t = compat_ip6t_get_target(e); |
| 1486 | module_put(t->u.kernel.target->me); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1487 | } |
| 1488 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1489 | static int |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1490 | check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, |
| 1491 | struct xt_table_info *newinfo, |
| 1492 | unsigned int *size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1493 | const unsigned char *base, |
| 1494 | const unsigned char *limit, |
| 1495 | const unsigned int *hook_entries, |
| 1496 | const unsigned int *underflows, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1497 | const char *name) |
| 1498 | { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1499 | struct xt_entry_match *ematch; |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1500 | struct xt_entry_target *t; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1501 | struct xt_target *target; |
| 1502 | unsigned int entry_offset; |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1503 | unsigned int j; |
| 1504 | int ret, off, h; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1505 | |
| 1506 | duprintf("check_compat_entry_size_and_hooks %p\n", e); |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 1507 | if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 || |
| 1508 | (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) { |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1509 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
| 1510 | return -EINVAL; |
| 1511 | } |
| 1512 | |
| 1513 | if (e->next_offset < sizeof(struct compat_ip6t_entry) + |
| 1514 | sizeof(struct compat_xt_entry_target)) { |
| 1515 | duprintf("checking: element %p size %u\n", |
| 1516 | e, e->next_offset); |
| 1517 | return -EINVAL; |
| 1518 | } |
| 1519 | |
| 1520 | /* For purposes of check_entry casting the compat entry is fine */ |
| 1521 | ret = check_entry((struct ip6t_entry *)e, name); |
| 1522 | if (ret) |
| 1523 | return ret; |
| 1524 | |
| 1525 | off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); |
| 1526 | entry_offset = (void *)e - (void *)base; |
| 1527 | j = 0; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1528 | xt_ematch_foreach(ematch, e) { |
Florian Westphal | 2f06550 | 2015-05-24 01:00:41 +0200 | [diff] [blame] | 1529 | ret = compat_find_calc_match(ematch, name, &e->ipv6, &off); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1530 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1531 | goto release_matches; |
| 1532 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1533 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1534 | |
| 1535 | t = compat_ip6t_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1536 | target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name, |
| 1537 | t->u.user.revision); |
| 1538 | if (IS_ERR(target)) { |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1539 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
| 1540 | t->u.user.name); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1541 | ret = PTR_ERR(target); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1542 | goto release_matches; |
| 1543 | } |
| 1544 | t->u.kernel.target = target; |
| 1545 | |
| 1546 | off += xt_compat_target_offset(target); |
| 1547 | *size += off; |
| 1548 | ret = xt_compat_add_offset(AF_INET6, entry_offset, off); |
| 1549 | if (ret) |
| 1550 | goto out; |
| 1551 | |
| 1552 | /* Check hooks & underflows */ |
| 1553 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
| 1554 | if ((unsigned char *)e - base == hook_entries[h]) |
| 1555 | newinfo->hook_entry[h] = hook_entries[h]; |
| 1556 | if ((unsigned char *)e - base == underflows[h]) |
| 1557 | newinfo->underflow[h] = underflows[h]; |
| 1558 | } |
| 1559 | |
| 1560 | /* Clear counters and comefrom */ |
| 1561 | memset(&e->counters, 0, sizeof(e->counters)); |
| 1562 | e->comefrom = 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1563 | return 0; |
| 1564 | |
| 1565 | out: |
| 1566 | module_put(t->u.kernel.target->me); |
| 1567 | release_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1568 | xt_ematch_foreach(ematch, e) { |
| 1569 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1570 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1571 | module_put(ematch->u.kernel.match->me); |
| 1572 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1573 | return ret; |
| 1574 | } |
| 1575 | |
| 1576 | static int |
| 1577 | compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, |
| 1578 | unsigned int *size, const char *name, |
| 1579 | struct xt_table_info *newinfo, unsigned char *base) |
| 1580 | { |
Jan Engelhardt | 87a2e70d | 2010-10-13 16:11:22 +0200 | [diff] [blame] | 1581 | struct xt_entry_target *t; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1582 | struct ip6t_entry *de; |
| 1583 | unsigned int origsize; |
| 1584 | int ret, h; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1585 | struct xt_entry_match *ematch; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1586 | |
| 1587 | ret = 0; |
| 1588 | origsize = *size; |
| 1589 | de = (struct ip6t_entry *)*dstptr; |
| 1590 | memcpy(de, e, sizeof(struct ip6t_entry)); |
| 1591 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
| 1592 | |
| 1593 | *dstptr += sizeof(struct ip6t_entry); |
| 1594 | *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); |
| 1595 | |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1596 | xt_ematch_foreach(ematch, e) { |
| 1597 | ret = xt_compat_match_from_user(ematch, dstptr, size); |
| 1598 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1599 | return ret; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1600 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1601 | de->target_offset = e->target_offset - (origsize - *size); |
| 1602 | t = compat_ip6t_get_target(e); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1603 | xt_compat_target_from_user(t, dstptr, size); |
| 1604 | |
| 1605 | de->next_offset = e->next_offset - (origsize - *size); |
| 1606 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
| 1607 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
| 1608 | newinfo->hook_entry[h] -= origsize - *size; |
| 1609 | if ((unsigned char *)de - base < newinfo->underflow[h]) |
| 1610 | newinfo->underflow[h] -= origsize - *size; |
| 1611 | } |
| 1612 | return ret; |
| 1613 | } |
| 1614 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1615 | static int compat_check_entry(struct ip6t_entry *e, struct net *net, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1616 | const char *name) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1617 | { |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1618 | unsigned int j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1619 | int ret = 0; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1620 | struct xt_mtchk_param mtpar; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1621 | struct xt_entry_match *ematch; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1622 | |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 1623 | e->counters.pcnt = xt_percpu_counter_alloc(); |
| 1624 | if (IS_ERR_VALUE(e->counters.pcnt)) |
| 1625 | return -ENOMEM; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1626 | j = 0; |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1627 | mtpar.net = net; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1628 | mtpar.table = name; |
| 1629 | mtpar.entryinfo = &e->ipv6; |
| 1630 | mtpar.hook_mask = e->comefrom; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 1631 | mtpar.family = NFPROTO_IPV6; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1632 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1633 | ret = check_match(ematch, &mtpar); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1634 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1635 | goto cleanup_matches; |
| 1636 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1637 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1638 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 1639 | ret = check_target(e, net, name); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1640 | if (ret) |
| 1641 | goto cleanup_matches; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1642 | return 0; |
| 1643 | |
| 1644 | cleanup_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1645 | xt_ematch_foreach(ematch, e) { |
| 1646 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1647 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1648 | cleanup_match(ematch, net); |
| 1649 | } |
Florian Westphal | 71ae0df | 2015-06-11 01:34:54 +0200 | [diff] [blame] | 1650 | |
| 1651 | xt_percpu_counter_free(e->counters.pcnt); |
| 1652 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1653 | return ret; |
| 1654 | } |
| 1655 | |
| 1656 | static int |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1657 | translate_compat_table(struct net *net, |
| 1658 | const char *name, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1659 | unsigned int valid_hooks, |
| 1660 | struct xt_table_info **pinfo, |
| 1661 | void **pentry0, |
| 1662 | unsigned int total_size, |
| 1663 | unsigned int number, |
| 1664 | unsigned int *hook_entries, |
| 1665 | unsigned int *underflows) |
| 1666 | { |
| 1667 | unsigned int i, j; |
| 1668 | struct xt_table_info *newinfo, *info; |
| 1669 | void *pos, *entry0, *entry1; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1670 | struct compat_ip6t_entry *iter0; |
| 1671 | struct ip6t_entry *iter1; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1672 | unsigned int size; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1673 | int ret = 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1674 | |
| 1675 | info = *pinfo; |
| 1676 | entry0 = *pentry0; |
| 1677 | size = total_size; |
| 1678 | info->number = number; |
| 1679 | |
| 1680 | /* Init all hooks to impossible value. */ |
| 1681 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
| 1682 | info->hook_entry[i] = 0xFFFFFFFF; |
| 1683 | info->underflow[i] = 0xFFFFFFFF; |
| 1684 | } |
| 1685 | |
| 1686 | duprintf("translate_compat_table: size %u\n", info->size); |
| 1687 | j = 0; |
| 1688 | xt_compat_lock(AF_INET6); |
Eric Dumazet | 255d0dc | 2010-12-18 18:35:15 +0100 | [diff] [blame] | 1689 | xt_compat_init_offsets(AF_INET6, number); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1690 | /* Walk through entries, checking offsets. */ |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1691 | xt_entry_foreach(iter0, entry0, total_size) { |
| 1692 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1693 | entry0, |
| 1694 | entry0 + total_size, |
| 1695 | hook_entries, |
| 1696 | underflows, |
| 1697 | name); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1698 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1699 | goto out_unlock; |
| 1700 | ++j; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1701 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1702 | |
| 1703 | ret = -EINVAL; |
| 1704 | if (j != number) { |
| 1705 | duprintf("translate_compat_table: %u not %u entries\n", |
| 1706 | j, number); |
| 1707 | goto out_unlock; |
| 1708 | } |
| 1709 | |
| 1710 | /* Check hooks all assigned */ |
| 1711 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
| 1712 | /* Only hooks which are valid */ |
| 1713 | if (!(valid_hooks & (1 << i))) |
| 1714 | continue; |
| 1715 | if (info->hook_entry[i] == 0xFFFFFFFF) { |
| 1716 | duprintf("Invalid hook entry %u %u\n", |
| 1717 | i, hook_entries[i]); |
| 1718 | goto out_unlock; |
| 1719 | } |
| 1720 | if (info->underflow[i] == 0xFFFFFFFF) { |
| 1721 | duprintf("Invalid underflow %u %u\n", |
| 1722 | i, underflows[i]); |
| 1723 | goto out_unlock; |
| 1724 | } |
| 1725 | } |
| 1726 | |
| 1727 | ret = -ENOMEM; |
| 1728 | newinfo = xt_alloc_table_info(size); |
| 1729 | if (!newinfo) |
| 1730 | goto out_unlock; |
| 1731 | |
| 1732 | newinfo->number = number; |
| 1733 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
| 1734 | newinfo->hook_entry[i] = info->hook_entry[i]; |
| 1735 | newinfo->underflow[i] = info->underflow[i]; |
| 1736 | } |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1737 | entry1 = newinfo->entries; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1738 | pos = entry1; |
| 1739 | size = total_size; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1740 | xt_entry_foreach(iter0, entry0, total_size) { |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1741 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
| 1742 | name, newinfo, entry1); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1743 | if (ret != 0) |
| 1744 | break; |
| 1745 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1746 | xt_compat_flush_offsets(AF_INET6); |
| 1747 | xt_compat_unlock(AF_INET6); |
| 1748 | if (ret) |
| 1749 | goto free_newinfo; |
| 1750 | |
| 1751 | ret = -ELOOP; |
| 1752 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) |
| 1753 | goto free_newinfo; |
| 1754 | |
| 1755 | i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1756 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1757 | ret = compat_check_entry(iter1, net, name); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1758 | if (ret != 0) |
| 1759 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1760 | ++i; |
Florian Westphal | 98dbbfc | 2015-08-26 23:20:51 +0200 | [diff] [blame] | 1761 | if (strcmp(ip6t_get_target(iter1)->u.user.name, |
| 1762 | XT_ERROR_TARGET) == 0) |
| 1763 | ++newinfo->stacksize; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1764 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1765 | if (ret) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1766 | /* |
| 1767 | * The first i matches need cleanup_entry (calls ->destroy) |
| 1768 | * because they had called ->check already. The other j-i |
| 1769 | * entries need only release. |
| 1770 | */ |
| 1771 | int skip = i; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1772 | j -= i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1773 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
| 1774 | if (skip-- > 0) |
| 1775 | continue; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1776 | if (j-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1777 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1778 | compat_release_entry(iter0); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1779 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1780 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
| 1781 | if (i-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1782 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1783 | cleanup_entry(iter1, net); |
| 1784 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1785 | xt_free_table_info(newinfo); |
| 1786 | return ret; |
| 1787 | } |
| 1788 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1789 | *pinfo = newinfo; |
| 1790 | *pentry0 = entry1; |
| 1791 | xt_free_table_info(info); |
| 1792 | return 0; |
| 1793 | |
| 1794 | free_newinfo: |
| 1795 | xt_free_table_info(newinfo); |
| 1796 | out: |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1797 | xt_entry_foreach(iter0, entry0, total_size) { |
| 1798 | if (j-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1799 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1800 | compat_release_entry(iter0); |
| 1801 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1802 | return ret; |
| 1803 | out_unlock: |
| 1804 | xt_compat_flush_offsets(AF_INET6); |
| 1805 | xt_compat_unlock(AF_INET6); |
| 1806 | goto out; |
| 1807 | } |
| 1808 | |
| 1809 | static int |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1810 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1811 | { |
| 1812 | int ret; |
| 1813 | struct compat_ip6t_replace tmp; |
| 1814 | struct xt_table_info *newinfo; |
| 1815 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1816 | struct ip6t_entry *iter; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1817 | |
| 1818 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1819 | return -EFAULT; |
| 1820 | |
| 1821 | /* overflow check */ |
| 1822 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
| 1823 | return -ENOMEM; |
| 1824 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1825 | return -ENOMEM; |
Dave Jones | 1086bbe | 2015-05-19 20:55:17 -0400 | [diff] [blame] | 1826 | if (tmp.num_counters == 0) |
| 1827 | return -EINVAL; |
| 1828 | |
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 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1835 | loc_cpu_entry = newinfo->entries; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1836 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
| 1837 | tmp.size) != 0) { |
| 1838 | ret = -EFAULT; |
| 1839 | goto free_newinfo; |
| 1840 | } |
| 1841 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1842 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1843 | &newinfo, &loc_cpu_entry, tmp.size, |
| 1844 | tmp.num_entries, tmp.hook_entry, |
| 1845 | tmp.underflow); |
| 1846 | if (ret != 0) |
| 1847 | goto free_newinfo; |
| 1848 | |
| 1849 | duprintf("compat_do_replace: Translated table\n"); |
| 1850 | |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1851 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1852 | tmp.num_counters, compat_ptr(tmp.counters)); |
| 1853 | if (ret) |
| 1854 | goto free_newinfo_untrans; |
| 1855 | return 0; |
| 1856 | |
| 1857 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1858 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1859 | cleanup_entry(iter, net); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1860 | free_newinfo: |
| 1861 | xt_free_table_info(newinfo); |
| 1862 | return ret; |
| 1863 | } |
| 1864 | |
| 1865 | static int |
| 1866 | compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, |
| 1867 | unsigned int len) |
| 1868 | { |
| 1869 | int ret; |
| 1870 | |
Eric W. Biederman | af31f41 | 2012-11-16 03:03:06 +0000 | [diff] [blame] | 1871 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1872 | return -EPERM; |
| 1873 | |
| 1874 | switch (cmd) { |
| 1875 | case IP6T_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1876 | ret = compat_do_replace(sock_net(sk), user, len); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1877 | break; |
| 1878 | |
| 1879 | case IP6T_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1880 | ret = do_add_counters(sock_net(sk), user, len, 1); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1881 | break; |
| 1882 | |
| 1883 | default: |
| 1884 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); |
| 1885 | ret = -EINVAL; |
| 1886 | } |
| 1887 | |
| 1888 | return ret; |
| 1889 | } |
| 1890 | |
| 1891 | struct compat_ip6t_get_entries { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 1892 | char name[XT_TABLE_MAXNAMELEN]; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1893 | compat_uint_t size; |
| 1894 | struct compat_ip6t_entry entrytable[0]; |
| 1895 | }; |
| 1896 | |
| 1897 | static int |
| 1898 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, |
| 1899 | void __user *userptr) |
| 1900 | { |
| 1901 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1902 | const struct xt_table_info *private = table->private; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1903 | void __user *pos; |
| 1904 | unsigned int size; |
| 1905 | int ret = 0; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1906 | unsigned int i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1907 | struct ip6t_entry *iter; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1908 | |
| 1909 | counters = alloc_counters(table); |
| 1910 | if (IS_ERR(counters)) |
| 1911 | return PTR_ERR(counters); |
| 1912 | |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1913 | pos = userptr; |
| 1914 | size = total_size; |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 1915 | xt_entry_foreach(iter, private->entries, total_size) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1916 | ret = compat_copy_entry_to_user(iter, &pos, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1917 | &size, counters, i++); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1918 | if (ret != 0) |
| 1919 | break; |
| 1920 | } |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1921 | |
| 1922 | vfree(counters); |
| 1923 | return ret; |
| 1924 | } |
| 1925 | |
| 1926 | static int |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1927 | compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, |
| 1928 | int *len) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1929 | { |
| 1930 | int ret; |
| 1931 | struct compat_ip6t_get_entries get; |
| 1932 | struct xt_table *t; |
| 1933 | |
| 1934 | if (*len < sizeof(get)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1935 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1936 | return -EINVAL; |
| 1937 | } |
| 1938 | |
| 1939 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1940 | return -EFAULT; |
| 1941 | |
| 1942 | if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1943 | duprintf("compat_get_entries: %u != %zu\n", |
| 1944 | *len, sizeof(get) + get.size); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1945 | return -EINVAL; |
| 1946 | } |
| 1947 | |
| 1948 | xt_compat_lock(AF_INET6); |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 1949 | t = xt_find_table_lock(net, AF_INET6, get.name); |
YOSHIFUJI Hideaki / 吉藤英明 | 0cc8d8d | 2013-01-22 06:33:09 +0000 | [diff] [blame] | 1950 | if (!IS_ERR_OR_NULL(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1951 | const struct xt_table_info *private = t->private; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1952 | struct xt_table_info info; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1953 | duprintf("t->private->number = %u\n", private->number); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1954 | ret = compat_table_info(private, &info); |
| 1955 | if (!ret && get.size == info.size) { |
| 1956 | ret = compat_copy_entries_to_user(private->size, |
| 1957 | t, uptr->entrytable); |
| 1958 | } else if (!ret) { |
| 1959 | duprintf("compat_get_entries: I've got %u not %u!\n", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1960 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1961 | ret = -EAGAIN; |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1962 | } |
| 1963 | xt_compat_flush_offsets(AF_INET6); |
| 1964 | module_put(t->me); |
| 1965 | xt_table_unlock(t); |
| 1966 | } else |
| 1967 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1968 | |
| 1969 | xt_compat_unlock(AF_INET6); |
| 1970 | return ret; |
| 1971 | } |
| 1972 | |
| 1973 | static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *); |
| 1974 | |
| 1975 | static int |
| 1976 | compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1977 | { |
| 1978 | int ret; |
| 1979 | |
Eric W. Biederman | af31f41 | 2012-11-16 03:03:06 +0000 | [diff] [blame] | 1980 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1981 | return -EPERM; |
| 1982 | |
| 1983 | switch (cmd) { |
| 1984 | case IP6T_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1985 | ret = get_info(sock_net(sk), user, len, 1); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1986 | break; |
| 1987 | case IP6T_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1988 | ret = compat_get_entries(sock_net(sk), user, len); |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 1989 | break; |
| 1990 | default: |
| 1991 | ret = do_ip6t_get_ctl(sk, cmd, user, len); |
| 1992 | } |
| 1993 | return ret; |
| 1994 | } |
| 1995 | #endif |
| 1996 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | static int |
| 1998 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
| 1999 | { |
| 2000 | int ret; |
| 2001 | |
Eric W. Biederman | af31f41 | 2012-11-16 03:03:06 +0000 | [diff] [blame] | 2002 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | return -EPERM; |
| 2004 | |
| 2005 | switch (cmd) { |
| 2006 | case IP6T_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2007 | ret = do_replace(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | break; |
| 2009 | |
| 2010 | case IP6T_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2011 | ret = do_add_counters(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | break; |
| 2013 | |
| 2014 | default: |
| 2015 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); |
| 2016 | ret = -EINVAL; |
| 2017 | } |
| 2018 | |
| 2019 | return ret; |
| 2020 | } |
| 2021 | |
| 2022 | static int |
| 2023 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 2024 | { |
| 2025 | int ret; |
| 2026 | |
Eric W. Biederman | af31f41 | 2012-11-16 03:03:06 +0000 | [diff] [blame] | 2027 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | return -EPERM; |
| 2029 | |
| 2030 | switch (cmd) { |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 2031 | case IP6T_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2032 | ret = get_info(sock_net(sk), user, len, 0); |
Patrick McHardy | 433665c | 2007-12-17 21:50:05 -0800 | [diff] [blame] | 2033 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | |
Patrick McHardy | d924357 | 2007-12-17 21:50:22 -0800 | [diff] [blame] | 2035 | case IP6T_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2036 | ret = get_entries(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2039 | case IP6T_SO_GET_REVISION_MATCH: |
| 2040 | case IP6T_SO_GET_REVISION_TARGET: { |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 2041 | struct xt_get_revision rev; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2042 | int target; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2043 | |
| 2044 | if (*len != sizeof(rev)) { |
| 2045 | ret = -EINVAL; |
| 2046 | break; |
| 2047 | } |
| 2048 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { |
| 2049 | ret = -EFAULT; |
| 2050 | break; |
| 2051 | } |
Vasiliy Kulikov | 6a8ab060 | 2011-03-15 13:37:13 +0100 | [diff] [blame] | 2052 | rev.name[sizeof(rev.name)-1] = 0; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2053 | |
| 2054 | if (cmd == IP6T_SO_GET_REVISION_TARGET) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2055 | target = 1; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2056 | else |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2057 | target = 0; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2058 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2059 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
| 2060 | rev.revision, |
| 2061 | target, &ret), |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 2062 | "ip6t_%s", rev.name); |
| 2063 | break; |
| 2064 | } |
| 2065 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | default: |
| 2067 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); |
| 2068 | ret = -EINVAL; |
| 2069 | } |
| 2070 | |
| 2071 | return ret; |
| 2072 | } |
| 2073 | |
Jan Engelhardt | 35aad0f | 2009-08-24 14:56:30 +0200 | [diff] [blame] | 2074 | struct xt_table *ip6t_register_table(struct net *net, |
| 2075 | const struct xt_table *table, |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 2076 | const struct ip6t_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2077 | { |
| 2078 | int ret; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2079 | struct xt_table_info *newinfo; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 2080 | struct xt_table_info bootstrap = {0}; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2081 | void *loc_cpu_entry; |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 2082 | struct xt_table *new_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2084 | newinfo = xt_alloc_table_info(repl->size); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2085 | if (!newinfo) { |
| 2086 | ret = -ENOMEM; |
| 2087 | goto out; |
| 2088 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 2090 | loc_cpu_entry = newinfo->entries; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2091 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 2093 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2094 | if (ret != 0) |
| 2095 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | |
Alexey Dobriyan | 336b517 | 2008-01-31 04:03:45 -0800 | [diff] [blame] | 2097 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 2098 | if (IS_ERR(new_table)) { |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2099 | ret = PTR_ERR(new_table); |
| 2100 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | } |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2102 | return new_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2104 | out_free: |
| 2105 | xt_free_table_info(newinfo); |
| 2106 | out: |
| 2107 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | } |
| 2109 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 2110 | void ip6t_unregister_table(struct net *net, struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2112 | struct xt_table_info *private; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2113 | void *loc_cpu_entry; |
Alexey Dobriyan | df20096 | 2008-01-31 04:05:34 -0800 | [diff] [blame] | 2114 | struct module *table_owner = table->me; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 2115 | struct ip6t_entry *iter; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2116 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2117 | private = xt_unregister_table(table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | |
| 2119 | /* Decrease module usage counts and free resources */ |
Florian Westphal | 482cfc3 | 2015-06-11 01:34:55 +0200 | [diff] [blame] | 2120 | loc_cpu_entry = private->entries; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 2121 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 2122 | cleanup_entry(iter, net); |
Alexey Dobriyan | df20096 | 2008-01-31 04:05:34 -0800 | [diff] [blame] | 2123 | if (private->number > private->initial_entries) |
| 2124 | module_put(table_owner); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2125 | xt_free_table_info(private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2126 | } |
| 2127 | |
| 2128 | /* 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] | 2129 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
| 2131 | u_int8_t type, u_int8_t code, |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 2132 | bool invert) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | { |
| 2134 | return (type == test_type && code >= min_code && code <= max_code) |
| 2135 | ^ invert; |
| 2136 | } |
| 2137 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2138 | static bool |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 2139 | icmp6_match(const struct sk_buff *skb, struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 2141 | const struct icmp6hdr *ic; |
| 2142 | struct icmp6hdr _icmph; |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2143 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | |
| 2145 | /* Must not be a fragment. */ |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2146 | if (par->fragoff != 0) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2147 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2148 | |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2149 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2150 | if (ic == NULL) { |
| 2151 | /* We've been asked to examine this packet, and we |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2152 | * can't. Hence, no choice but to drop. |
| 2153 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | duprintf("Dropping evil ICMP tinygram.\n"); |
Jan Engelhardt | b4ba261 | 2009-07-07 20:54:30 +0200 | [diff] [blame] | 2155 | par->hotdrop = true; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2156 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | } |
| 2158 | |
| 2159 | return icmp6_type_code_match(icmpinfo->type, |
| 2160 | icmpinfo->code[0], |
| 2161 | icmpinfo->code[1], |
| 2162 | ic->icmp6_type, ic->icmp6_code, |
| 2163 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); |
| 2164 | } |
| 2165 | |
| 2166 | /* Called when user tries to insert an entry of this type. */ |
Jan Engelhardt | b0f3845 | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 2167 | static int icmp6_checkentry(const struct xt_mtchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2169 | const struct ip6t_icmp *icmpinfo = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | |
Patrick McHardy | 7f93971 | 2006-03-20 18:01:43 -0800 | [diff] [blame] | 2171 | /* Must specify no unknown invflags */ |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 2172 | return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2173 | } |
| 2174 | |
| 2175 | /* The built-in targets: standard (NULL) and error. */ |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2176 | static struct xt_target ip6t_builtin_tg[] __read_mostly = { |
| 2177 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 2178 | .name = XT_STANDARD_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2179 | .targetsize = sizeof(int), |
| 2180 | .family = NFPROTO_IPV6, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 2181 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2182 | .compatsize = sizeof(compat_int_t), |
| 2183 | .compat_from_user = compat_standard_from_user, |
| 2184 | .compat_to_user = compat_standard_to_user, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 2185 | #endif |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2186 | }, |
| 2187 | { |
Jan Engelhardt | 243bf6e | 2010-10-13 16:28:00 +0200 | [diff] [blame] | 2188 | .name = XT_ERROR_TARGET, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2189 | .target = ip6t_error, |
Jan Engelhardt | 12b00c2 | 2010-10-13 15:56:56 +0200 | [diff] [blame] | 2190 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2191 | .family = NFPROTO_IPV6, |
| 2192 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2193 | }; |
| 2194 | |
| 2195 | static struct nf_sockopt_ops ip6t_sockopts = { |
| 2196 | .pf = PF_INET6, |
| 2197 | .set_optmin = IP6T_BASE_CTL, |
| 2198 | .set_optmax = IP6T_SO_SET_MAX+1, |
| 2199 | .set = do_ip6t_set_ctl, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 2200 | #ifdef CONFIG_COMPAT |
| 2201 | .compat_set = compat_do_ip6t_set_ctl, |
| 2202 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2203 | .get_optmin = IP6T_BASE_CTL, |
| 2204 | .get_optmax = IP6T_SO_GET_MAX+1, |
| 2205 | .get = do_ip6t_get_ctl, |
Patrick McHardy | 3bc3fe5 | 2007-12-17 21:50:37 -0800 | [diff] [blame] | 2206 | #ifdef CONFIG_COMPAT |
| 2207 | .compat_get = compat_do_ip6t_get_ctl, |
| 2208 | #endif |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 2209 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | }; |
| 2211 | |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2212 | static struct xt_match ip6t_builtin_mt[] __read_mostly = { |
| 2213 | { |
| 2214 | .name = "icmp6", |
| 2215 | .match = icmp6_match, |
| 2216 | .matchsize = sizeof(struct ip6t_icmp), |
| 2217 | .checkentry = icmp6_checkentry, |
| 2218 | .proto = IPPROTO_ICMPV6, |
| 2219 | .family = NFPROTO_IPV6, |
| 2220 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | }; |
| 2222 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2223 | static int __net_init ip6_tables_net_init(struct net *net) |
| 2224 | { |
Jan Engelhardt | 383ca5b | 2009-04-14 14:24:21 +0200 | [diff] [blame] | 2225 | return xt_proto_init(net, NFPROTO_IPV6); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2226 | } |
| 2227 | |
| 2228 | static void __net_exit ip6_tables_net_exit(struct net *net) |
| 2229 | { |
Jan Engelhardt | 383ca5b | 2009-04-14 14:24:21 +0200 | [diff] [blame] | 2230 | xt_proto_fini(net, NFPROTO_IPV6); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2231 | } |
| 2232 | |
| 2233 | static struct pernet_operations ip6_tables_net_ops = { |
| 2234 | .init = ip6_tables_net_init, |
| 2235 | .exit = ip6_tables_net_exit, |
| 2236 | }; |
| 2237 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2238 | static int __init ip6_tables_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | { |
| 2240 | int ret; |
| 2241 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2242 | ret = register_pernet_subsys(&ip6_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2243 | if (ret < 0) |
| 2244 | goto err1; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2245 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2246 | /* 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] | 2247 | ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2248 | if (ret < 0) |
| 2249 | goto err2; |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2250 | ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2251 | if (ret < 0) |
| 2252 | goto err4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2253 | |
| 2254 | /* Register setsockopt */ |
| 2255 | ret = nf_register_sockopt(&ip6t_sockopts); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2256 | if (ret < 0) |
| 2257 | goto err5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2258 | |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 2259 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | return 0; |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2261 | |
| 2262 | err5: |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2263 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2264 | err4: |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2265 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2266 | err2: |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2267 | unregister_pernet_subsys(&ip6_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2268 | err1: |
| 2269 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | } |
| 2271 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2272 | static void __exit ip6_tables_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | { |
| 2274 | nf_unregister_sockopt(&ip6t_sockopts); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2275 | |
Jan Engelhardt | 4538506 | 2009-07-04 12:50:00 +0200 | [diff] [blame] | 2276 | xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt)); |
| 2277 | xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg)); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2278 | unregister_pernet_subsys(&ip6_tables_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | } |
| 2280 | |
| 2281 | EXPORT_SYMBOL(ip6t_register_table); |
| 2282 | EXPORT_SYMBOL(ip6t_unregister_table); |
| 2283 | EXPORT_SYMBOL(ip6t_do_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2284 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2285 | module_init(ip6_tables_init); |
| 2286 | module_exit(ip6_tables_fini); |