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 | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/cache.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 13 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/kmod.h> |
| 16 | #include <linux/vmalloc.h> |
| 17 | #include <linux/netdevice.h> |
| 18 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/icmp.h> |
| 20 | #include <net/ip.h> |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 21 | #include <net/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <asm/uaccess.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 23 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/proc_fs.h> |
| 25 | #include <linux/err.h> |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 26 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 28 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/netfilter_ipv4/ip_tables.h> |
Patrick McHardy | f01ffbd | 2007-12-17 22:38:49 -0800 | [diff] [blame] | 30 | #include <net/netfilter/nf_log.h> |
Jan Engelhardt | e3eaa99 | 2009-06-17 22:14:54 +0200 | [diff] [blame] | 31 | #include "../../netfilter/xt_repldata.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | MODULE_LICENSE("GPL"); |
| 34 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 35 | MODULE_DESCRIPTION("IPv4 packet filter"); |
| 36 | |
| 37 | /*#define DEBUG_IP_FIREWALL*/ |
| 38 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ |
| 39 | /*#define DEBUG_IP_FIREWALL_USER*/ |
| 40 | |
| 41 | #ifdef DEBUG_IP_FIREWALL |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 42 | #define dprintf(format, args...) pr_info(format , ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #else |
| 44 | #define dprintf(format, args...) |
| 45 | #endif |
| 46 | |
| 47 | #ifdef DEBUG_IP_FIREWALL_USER |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 48 | #define duprintf(format, args...) pr_info(format , ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #else |
| 50 | #define duprintf(format, args...) |
| 51 | #endif |
| 52 | |
| 53 | #ifdef CONFIG_NETFILTER_DEBUG |
| 54 | #define IP_NF_ASSERT(x) \ |
| 55 | do { \ |
| 56 | if (!(x)) \ |
| 57 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 58 | __func__, __FILE__, __LINE__); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | } while(0) |
| 60 | #else |
| 61 | #define IP_NF_ASSERT(x) |
| 62 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 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 *ipt_alloc_initial_table(const struct xt_table *info) |
| 71 | { |
| 72 | return xt_alloc_initial_table(ipt, IPT); |
| 73 | } |
| 74 | EXPORT_SYMBOL_GPL(ipt_alloc_initial_table); |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | /* |
| 77 | We keep a set of rules for each CPU, so we can avoid write-locking |
| 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. |
| 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 */ |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 87 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | ip_packet_match(const struct iphdr *ip, |
| 89 | const char *indev, |
| 90 | const char *outdev, |
| 91 | const struct ipt_ip *ipinfo, |
| 92 | int isfrag) |
| 93 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | unsigned long ret; |
| 95 | |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 96 | #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
| 98 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 99 | IPT_INV_SRCIP) || |
| 100 | FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, |
| 101 | IPT_INV_DSTIP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | dprintf("Source or dest mismatch.\n"); |
| 103 | |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 104 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
| 105 | &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 107 | dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
| 108 | &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 110 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | } |
| 112 | |
Eric Dumazet | b8dfe49 | 2009-03-25 17:31:52 +0100 | [diff] [blame] | 113 | ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
| 115 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { |
| 116 | dprintf("VIA in mismatch (%s vs %s).%s\n", |
| 117 | indev, ipinfo->iniface, |
| 118 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 119 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
| 121 | |
Eric Dumazet | b8dfe49 | 2009-03-25 17:31:52 +0100 | [diff] [blame] | 122 | ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { |
| 125 | dprintf("VIA out mismatch (%s vs %s).%s\n", |
| 126 | outdev, ipinfo->outiface, |
| 127 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 128 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | } |
| 130 | |
| 131 | /* Check specific protocol */ |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 132 | if (ipinfo->proto && |
| 133 | FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | dprintf("Packet protocol %hi does not match %hi.%s\n", |
| 135 | ip->protocol, ipinfo->proto, |
| 136 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 137 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | /* If we have a fragment rule but the packet is not a fragment |
| 141 | * then we return zero */ |
| 142 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { |
| 143 | dprintf("Fragment rule but not fragment.%s\n", |
| 144 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 145 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | } |
| 147 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 148 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 151 | static bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | ip_checkentry(const struct ipt_ip *ip) |
| 153 | { |
| 154 | if (ip->flags & ~IPT_F_MASK) { |
| 155 | duprintf("Unknown flag bits set: %08X\n", |
| 156 | ip->flags & ~IPT_F_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 157 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | } |
| 159 | if (ip->invflags & ~IPT_INV_MASK) { |
| 160 | duprintf("Unknown invflag bits set: %08X\n", |
| 161 | ip->invflags & ~IPT_INV_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 162 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | } |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 164 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | static unsigned int |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 168 | ipt_error(struct sk_buff *skb, const struct xt_target_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | { |
| 170 | if (net_ratelimit()) |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 171 | pr_info("error: `%s'\n", (const char *)par->targinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
| 173 | return NF_DROP; |
| 174 | } |
| 175 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 176 | /* Performance critical */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | static inline struct ipt_entry * |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 178 | get_entry(const void *base, unsigned int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
| 180 | return (struct ipt_entry *)(base + offset); |
| 181 | } |
| 182 | |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 183 | /* All zeroes == unconditional rule. */ |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 184 | /* Mildly perf critical (only if packet tracing is on) */ |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 185 | static inline bool unconditional(const struct ipt_ip *ip) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 186 | { |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 187 | static const struct ipt_ip uncond; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 188 | |
Jan Engelhardt | 47901dc | 2009-07-09 23:00:19 +0200 | [diff] [blame] | 189 | return memcmp(ip, &uncond, sizeof(uncond)) == 0; |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 190 | #undef FWINV |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 191 | } |
| 192 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 193 | /* for const-correctness */ |
| 194 | static inline const struct ipt_entry_target * |
| 195 | ipt_get_target_c(const struct ipt_entry *e) |
| 196 | { |
| 197 | return ipt_get_target((struct ipt_entry *)e); |
| 198 | } |
| 199 | |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 200 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
| 201 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 202 | static const char *const hooknames[] = { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 203 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
| 204 | [NF_INET_LOCAL_IN] = "INPUT", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 205 | [NF_INET_FORWARD] = "FORWARD", |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 206 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
| 207 | [NF_INET_POST_ROUTING] = "POSTROUTING", |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 208 | }; |
| 209 | |
| 210 | enum nf_ip_trace_comments { |
| 211 | NF_IP_TRACE_COMMENT_RULE, |
| 212 | NF_IP_TRACE_COMMENT_RETURN, |
| 213 | NF_IP_TRACE_COMMENT_POLICY, |
| 214 | }; |
| 215 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 216 | static const char *const comments[] = { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 217 | [NF_IP_TRACE_COMMENT_RULE] = "rule", |
| 218 | [NF_IP_TRACE_COMMENT_RETURN] = "return", |
| 219 | [NF_IP_TRACE_COMMENT_POLICY] = "policy", |
| 220 | }; |
| 221 | |
| 222 | static struct nf_loginfo trace_loginfo = { |
| 223 | .type = NF_LOG_TYPE_LOG, |
| 224 | .u = { |
| 225 | .log = { |
| 226 | .level = 4, |
| 227 | .logflags = NF_LOG_MASK, |
| 228 | }, |
| 229 | }, |
| 230 | }; |
| 231 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 232 | /* Mildly perf critical (only if packet tracing is on) */ |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 233 | static inline int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 234 | get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e, |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 235 | const char *hookname, const char **chainname, |
| 236 | const char **comment, unsigned int *rulenum) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 237 | { |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 238 | const struct ipt_standard_target *t = (void *)ipt_get_target_c(s); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 239 | |
| 240 | if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) { |
| 241 | /* Head of user chain: ERROR target with chainname */ |
| 242 | *chainname = t->target.data; |
| 243 | (*rulenum) = 0; |
| 244 | } else if (s == e) { |
| 245 | (*rulenum)++; |
| 246 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 247 | if (s->target_offset == sizeof(struct ipt_entry) && |
| 248 | strcmp(t->target.u.kernel.target->name, |
| 249 | IPT_STANDARD_TARGET) == 0 && |
| 250 | t->verdict < 0 && |
| 251 | unconditional(&s->ip)) { |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 252 | /* Tail of chains: STANDARD target (return/policy) */ |
| 253 | *comment = *chainname == hookname |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 254 | ? comments[NF_IP_TRACE_COMMENT_POLICY] |
| 255 | : comments[NF_IP_TRACE_COMMENT_RETURN]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 256 | } |
| 257 | return 1; |
| 258 | } else |
| 259 | (*rulenum)++; |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 264 | static void trace_packet(const struct sk_buff *skb, |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 265 | unsigned int hook, |
| 266 | const struct net_device *in, |
| 267 | const struct net_device *out, |
Jan Engelhardt | ecb6f85 | 2008-01-31 03:54:47 -0800 | [diff] [blame] | 268 | const char *tablename, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 269 | const struct xt_table_info *private, |
| 270 | const struct ipt_entry *e) |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 271 | { |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 272 | const void *table_base; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 273 | const struct ipt_entry *root; |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 274 | const char *hookname, *chainname, *comment; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 275 | const struct ipt_entry *iter; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 276 | unsigned int rulenum = 0; |
| 277 | |
Jan Engelhardt | ccf5bd8 | 2009-04-15 20:27:03 +0200 | [diff] [blame] | 278 | table_base = private->entries[smp_processor_id()]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 279 | root = get_entry(table_base, private->hook_entry[hook]); |
| 280 | |
Jan Engelhardt | 4f2f6f2 | 2009-04-15 20:31:13 +0200 | [diff] [blame] | 281 | hookname = chainname = hooknames[hook]; |
| 282 | comment = comments[NF_IP_TRACE_COMMENT_RULE]; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 283 | |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 284 | xt_entry_foreach(iter, root, private->size - private->hook_entry[hook]) |
| 285 | if (get_chainname_rulenum(iter, e, hookname, |
| 286 | &chainname, &comment, &rulenum) != 0) |
| 287 | break; |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 288 | |
| 289 | nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo, |
| 290 | "TRACE: %s:%s:%s:%u ", |
| 291 | tablename, chainname, comment, rulenum); |
| 292 | } |
| 293 | #endif |
| 294 | |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 295 | static inline __pure |
| 296 | struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry) |
| 297 | { |
| 298 | return (void *)entry + entry->next_offset; |
| 299 | } |
| 300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
| 302 | unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 303 | ipt_do_table(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | unsigned int hook, |
| 305 | const struct net_device *in, |
| 306 | const struct net_device *out, |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 307 | struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | { |
| 309 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 310 | const struct iphdr *ip; |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 311 | bool hotdrop = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
| 313 | unsigned int verdict = NF_DROP; |
| 314 | const char *indev, *outdev; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 315 | const void *table_base; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 316 | struct ipt_entry *e, **jumpstack; |
| 317 | unsigned int *stackptr, origptr, cpu; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 318 | const struct xt_table_info *private; |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 319 | struct xt_match_param mtpar; |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 320 | struct xt_target_param tgpar; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | /* Initialization */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 323 | ip = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | indev = in ? in->name : nulldevname; |
| 325 | outdev = out ? out->name : nulldevname; |
| 326 | /* We handle fragments by dealing with the first fragment as |
| 327 | * if it was a normal packet. All other fragments are treated |
| 328 | * normally, except that they will NEVER match rules that ask |
| 329 | * things we don't know, ie. tcp syn flag or ports). If the |
| 330 | * rule is also a fragment-specific rule, non-fragments won't |
| 331 | * match it. */ |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 332 | mtpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET; |
| 333 | mtpar.thoff = ip_hdrlen(skb); |
| 334 | mtpar.hotdrop = &hotdrop; |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 335 | mtpar.in = tgpar.in = in; |
| 336 | mtpar.out = tgpar.out = out; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 337 | mtpar.family = tgpar.family = NFPROTO_IPV4; |
Evgeniy Polyakov | a5e7882 | 2009-06-04 16:54:42 +0200 | [diff] [blame] | 338 | mtpar.hooknum = tgpar.hooknum = hook; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 341 | xt_info_rdlock_bh(); |
| 342 | private = table->private; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 343 | cpu = smp_processor_id(); |
| 344 | table_base = private->entries[cpu]; |
| 345 | jumpstack = (struct ipt_entry **)private->jumpstack[cpu]; |
| 346 | stackptr = &private->stackptr[cpu]; |
| 347 | origptr = *stackptr; |
Stephen Hemminger | 7845447 | 2009-02-20 10:35:32 +0100 | [diff] [blame] | 348 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 349 | e = get_entry(table_base, private->hook_entry[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
Patrick McHardy | cecc74d | 2010-04-22 13:03:24 +0200 | [diff] [blame] | 351 | pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n", |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 352 | table->name, hook, origptr, |
| 353 | get_entry(table_base, private->underflow[hook])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
| 355 | do { |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 356 | const struct ipt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 357 | const struct xt_entry_match *ematch; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | IP_NF_ASSERT(e); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 360 | if (!ip_packet_match(ip, indev, outdev, |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 361 | &e->ip, mtpar.fragoff)) { |
| 362 | no_match: |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 363 | e = ipt_next_entry(e); |
| 364 | continue; |
| 365 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Jan Engelhardt | ef53d70 | 2009-07-09 19:14:18 +0200 | [diff] [blame^] | 367 | xt_ematch_foreach(ematch, e) { |
| 368 | mtpar.match = ematch->u.kernel.match; |
| 369 | mtpar.matchinfo = ematch->data; |
| 370 | if (!mtpar.match->match(skb, &mtpar)) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 371 | goto no_match; |
Jan Engelhardt | ef53d70 | 2009-07-09 19:14:18 +0200 | [diff] [blame^] | 372 | } |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 373 | |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 374 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 376 | t = ipt_get_target(e); |
| 377 | IP_NF_ASSERT(t->u.kernel.target); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 378 | |
| 379 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
| 380 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 381 | /* The packet is traced: log it */ |
| 382 | if (unlikely(skb->nf_trace)) |
| 383 | trace_packet(skb, hook, in, out, |
| 384 | table->name, private, e); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 385 | #endif |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 386 | /* Standard target? */ |
| 387 | if (!t->u.kernel.target->target) { |
| 388 | int v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 390 | v = ((struct ipt_standard_target *)t)->verdict; |
| 391 | if (v < 0) { |
| 392 | /* Pop from stack? */ |
| 393 | if (v != IPT_RETURN) { |
| 394 | verdict = (unsigned)(-v) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | break; |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 396 | } |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 397 | if (*stackptr == 0) { |
| 398 | e = get_entry(table_base, |
| 399 | private->underflow[hook]); |
Patrick McHardy | cecc74d | 2010-04-22 13:03:24 +0200 | [diff] [blame] | 400 | pr_debug("Underflow (this is normal) " |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 401 | "to %p\n", e); |
| 402 | } else { |
| 403 | e = jumpstack[--*stackptr]; |
Patrick McHardy | cecc74d | 2010-04-22 13:03:24 +0200 | [diff] [blame] | 404 | pr_debug("Pulled %p out from pos %u\n", |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 405 | e, *stackptr); |
| 406 | e = ipt_next_entry(e); |
| 407 | } |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 408 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | } |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 410 | if (table_base + v != ipt_next_entry(e) && |
| 411 | !(e->ip.flags & IPT_F_GOTO)) { |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 412 | if (*stackptr >= private->stacksize) { |
| 413 | verdict = NF_DROP; |
| 414 | break; |
| 415 | } |
| 416 | jumpstack[(*stackptr)++] = e; |
Patrick McHardy | cecc74d | 2010-04-22 13:03:24 +0200 | [diff] [blame] | 417 | pr_debug("Pushed %p into pos %u\n", |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 418 | e, *stackptr - 1); |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 419 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
Jan Engelhardt | a1ff4ac | 2009-04-15 21:28:39 +0200 | [diff] [blame] | 421 | e = get_entry(table_base, v); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 422 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 424 | |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 425 | tgpar.target = t->u.kernel.target; |
| 426 | tgpar.targinfo = t->data; |
Jan Engelhardt | bb70dfa | 2009-04-15 21:40:13 +0200 | [diff] [blame] | 427 | |
| 428 | |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 429 | verdict = t->u.kernel.target->target(skb, &tgpar); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 430 | /* Target might have changed stuff. */ |
| 431 | ip = ip_hdr(skb); |
Jan Engelhardt | 7a6b1c4 | 2009-04-15 21:35:33 +0200 | [diff] [blame] | 432 | if (verdict == IPT_CONTINUE) |
| 433 | e = ipt_next_entry(e); |
| 434 | else |
| 435 | /* Verdict */ |
| 436 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | } while (!hotdrop); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 438 | xt_info_rdunlock_bh(); |
Patrick McHardy | cecc74d | 2010-04-22 13:03:24 +0200 | [diff] [blame] | 439 | pr_debug("Exiting %s; resetting sp from %u to %u\n", |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 440 | __func__, *stackptr, origptr); |
| 441 | *stackptr = origptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | #ifdef DEBUG_ALLOW_ALL |
| 443 | return NF_ACCEPT; |
| 444 | #else |
| 445 | if (hotdrop) |
| 446 | return NF_DROP; |
| 447 | else return verdict; |
| 448 | #endif |
| 449 | } |
| 450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | /* Figures out from what hook each rule can be called: returns 0 if |
| 452 | there are loops. Puts hook bitmask in comefrom. */ |
| 453 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 454 | mark_source_chains(const struct xt_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 455 | unsigned int valid_hooks, void *entry0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | { |
| 457 | unsigned int hook; |
| 458 | |
| 459 | /* No recursion; use packet counter to save back ptrs (reset |
| 460 | to 0 as we leave), and comefrom to save source hook bitmask */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 461 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | unsigned int pos = newinfo->hook_entry[hook]; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 463 | struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
| 465 | if (!(valid_hooks & (1 << hook))) |
| 466 | continue; |
| 467 | |
| 468 | /* Set initial back pointer. */ |
| 469 | e->counters.pcnt = pos; |
| 470 | |
| 471 | for (;;) { |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 472 | const struct ipt_standard_target *t |
| 473 | = (void *)ipt_get_target_c(e); |
Al Viro | e1b4b9f | 2006-12-12 00:29:52 -0800 | [diff] [blame] | 474 | int visited = e->comefrom & (1 << hook); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 476 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | printk("iptables: loop hook %u pos %u %08X.\n", |
| 478 | hook, pos, e->comefrom); |
| 479 | return 0; |
| 480 | } |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 481 | e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
| 483 | /* Unconditional return/END. */ |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 484 | if ((e->target_offset == sizeof(struct ipt_entry) && |
| 485 | (strcmp(t->target.u.user.name, |
| 486 | IPT_STANDARD_TARGET) == 0) && |
| 487 | t->verdict < 0 && unconditional(&e->ip)) || |
| 488 | visited) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | unsigned int oldpos, size; |
| 490 | |
Patrick McHardy | 1f9352a | 2009-03-25 19:26:35 +0100 | [diff] [blame] | 491 | if ((strcmp(t->target.u.user.name, |
| 492 | IPT_STANDARD_TARGET) == 0) && |
| 493 | t->verdict < -NF_MAX_VERDICT - 1) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 494 | duprintf("mark_source_chains: bad " |
| 495 | "negative verdict (%i)\n", |
| 496 | t->verdict); |
| 497 | return 0; |
| 498 | } |
| 499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | /* Return: backtrack through the last |
| 501 | big jump. */ |
| 502 | do { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 503 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | #ifdef DEBUG_IP_FIREWALL_USER |
| 505 | if (e->comefrom |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 506 | & (1 << NF_INET_NUMHOOKS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | duprintf("Back unset " |
| 508 | "on hook %u " |
| 509 | "rule %u\n", |
| 510 | hook, pos); |
| 511 | } |
| 512 | #endif |
| 513 | oldpos = pos; |
| 514 | pos = e->counters.pcnt; |
| 515 | e->counters.pcnt = 0; |
| 516 | |
| 517 | /* We're at the start. */ |
| 518 | if (pos == oldpos) |
| 519 | goto next; |
| 520 | |
| 521 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 522 | (entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | } while (oldpos == pos + e->next_offset); |
| 524 | |
| 525 | /* Move along one */ |
| 526 | size = e->next_offset; |
| 527 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 528 | (entry0 + pos + size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | e->counters.pcnt = pos; |
| 530 | pos += size; |
| 531 | } else { |
| 532 | int newpos = t->verdict; |
| 533 | |
| 534 | if (strcmp(t->target.u.user.name, |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 535 | IPT_STANDARD_TARGET) == 0 && |
| 536 | newpos >= 0) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 537 | if (newpos > newinfo->size - |
| 538 | sizeof(struct ipt_entry)) { |
| 539 | duprintf("mark_source_chains: " |
| 540 | "bad verdict (%i)\n", |
| 541 | newpos); |
| 542 | return 0; |
| 543 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | /* This a jump; chase it. */ |
| 545 | duprintf("Jump rule %u -> %u\n", |
| 546 | pos, newpos); |
| 547 | } else { |
| 548 | /* ... this is a fallthru */ |
| 549 | newpos = pos + e->next_offset; |
| 550 | } |
| 551 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 552 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | e->counters.pcnt = pos; |
| 554 | pos = newpos; |
| 555 | } |
| 556 | } |
| 557 | next: |
| 558 | duprintf("Finished chain %u\n", hook); |
| 559 | } |
| 560 | return 1; |
| 561 | } |
| 562 | |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 563 | static void cleanup_match(struct ipt_entry_match *m, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | { |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 565 | struct xt_mtdtor_param par; |
| 566 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 567 | par.net = net; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 568 | par.match = m->u.kernel.match; |
| 569 | par.matchinfo = m->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 570 | par.family = NFPROTO_IPV4; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 571 | if (par.match->destroy != NULL) |
| 572 | par.match->destroy(&par); |
| 573 | module_put(par.match->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } |
| 575 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 576 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 577 | check_entry(const struct ipt_entry *e, const char *name) |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 578 | { |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 579 | const struct ipt_entry_target *t; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 580 | |
| 581 | if (!ip_checkentry(&e->ip)) { |
Jan Engelhardt | b5cad0d | 2010-05-02 13:55:21 +0200 | [diff] [blame] | 582 | duprintf("ip check failed %p %s.\n", e, par->match->name); |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 583 | return -EINVAL; |
| 584 | } |
| 585 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 586 | if (e->target_offset + sizeof(struct ipt_entry_target) > |
| 587 | e->next_offset) |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 588 | return -EINVAL; |
| 589 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 590 | t = ipt_get_target_c(e); |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 591 | if (e->target_offset + t->u.target_size > e->next_offset) |
| 592 | return -EINVAL; |
| 593 | |
| 594 | return 0; |
| 595 | } |
| 596 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 597 | static int |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 598 | check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par) |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 599 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 600 | const struct ipt_ip *ip = par->entryinfo; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 601 | int ret; |
| 602 | |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 603 | par->match = m->u.kernel.match; |
| 604 | par->matchinfo = m->data; |
| 605 | |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 606 | ret = xt_check_match(par, m->u.match_size - sizeof(*m), |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 607 | ip->proto, ip->invflags & IPT_INV_PROTO); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 608 | if (ret < 0) { |
Jan Engelhardt | b5cad0d | 2010-05-02 13:55:21 +0200 | [diff] [blame] | 609 | duprintf("check failed for `%s'.\n", par->match->name); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 610 | return ret; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 611 | } |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 612 | return 0; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 613 | } |
| 614 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 615 | static int |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 616 | find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 618 | struct xt_match *match; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 619 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 621 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
| 622 | m->u.user.revision); |
| 623 | if (IS_ERR(match)) { |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 624 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 625 | return PTR_ERR(match); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
| 627 | m->u.kernel.match = match; |
| 628 | |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 629 | ret = check_match(m, par); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 630 | if (ret) |
| 631 | goto err; |
| 632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 634 | err: |
| 635 | module_put(m->u.kernel.match->me); |
| 636 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | } |
| 638 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 639 | static int check_target(struct ipt_entry *e, struct net *net, const char *name) |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 640 | { |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 641 | struct ipt_entry_target *t = ipt_get_target(e); |
| 642 | struct xt_tgchk_param par = { |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 643 | .net = net, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 644 | .table = name, |
| 645 | .entryinfo = e, |
| 646 | .target = t->u.kernel.target, |
| 647 | .targinfo = t->data, |
| 648 | .hook_mask = e->comefrom, |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 649 | .family = NFPROTO_IPV4, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 650 | }; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 651 | int ret; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 652 | |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 653 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 654 | e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 655 | if (ret < 0) { |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 656 | duprintf("check failed for `%s'.\n", |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 657 | t->u.kernel.target->name); |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 658 | return ret; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 659 | } |
Jan Engelhardt | 367c679 | 2008-10-08 11:35:17 +0200 | [diff] [blame] | 660 | return 0; |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 661 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 663 | static int |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 664 | find_check_entry(struct ipt_entry *e, struct net *net, const char *name, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 665 | unsigned int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | { |
| 667 | struct ipt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 668 | struct xt_target *target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | int ret; |
| 670 | unsigned int j; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 671 | struct xt_mtchk_param mtpar; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 672 | struct xt_entry_match *ematch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 674 | ret = check_entry(e, name); |
| 675 | if (ret) |
| 676 | return ret; |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | j = 0; |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 679 | mtpar.net = net; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 680 | mtpar.table = name; |
| 681 | mtpar.entryinfo = &e->ip; |
| 682 | mtpar.hook_mask = e->comefrom; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 683 | mtpar.family = NFPROTO_IPV4; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 684 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 685 | ret = find_check_match(ematch, &mtpar); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 686 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 687 | goto cleanup_matches; |
| 688 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 689 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
| 691 | t = ipt_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 692 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
| 693 | t->u.user.revision); |
| 694 | if (IS_ERR(target)) { |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 695 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 696 | ret = PTR_ERR(target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | goto cleanup_matches; |
| 698 | } |
| 699 | t->u.kernel.target = target; |
| 700 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 701 | ret = check_target(e, net, name); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 702 | if (ret) |
| 703 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 705 | err: |
| 706 | module_put(t->u.kernel.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | cleanup_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 708 | xt_ematch_foreach(ematch, e) { |
| 709 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 710 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 711 | cleanup_match(ematch, net); |
| 712 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | return ret; |
| 714 | } |
| 715 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 716 | static bool check_underflow(const struct ipt_entry *e) |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 717 | { |
| 718 | const struct ipt_entry_target *t; |
| 719 | unsigned int verdict; |
| 720 | |
| 721 | if (!unconditional(&e->ip)) |
| 722 | return false; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 723 | t = ipt_get_target_c(e); |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 724 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
| 725 | return false; |
| 726 | verdict = ((struct ipt_standard_target *)t)->verdict; |
| 727 | verdict = -verdict - 1; |
| 728 | return verdict == NF_DROP || verdict == NF_ACCEPT; |
| 729 | } |
| 730 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 731 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | check_entry_size_and_hooks(struct ipt_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 733 | struct xt_table_info *newinfo, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 734 | const unsigned char *base, |
| 735 | const unsigned char *limit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | const unsigned int *hook_entries, |
| 737 | const unsigned int *underflows, |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 738 | unsigned int valid_hooks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | { |
| 740 | unsigned int h; |
| 741 | |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 742 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 || |
| 743 | (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | duprintf("Bad offset %p\n", e); |
| 745 | return -EINVAL; |
| 746 | } |
| 747 | |
| 748 | if (e->next_offset |
| 749 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { |
| 750 | duprintf("checking: element %p size %u\n", |
| 751 | e, e->next_offset); |
| 752 | return -EINVAL; |
| 753 | } |
| 754 | |
| 755 | /* Check hooks & underflows */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 756 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Jan Engelhardt | a7d5173 | 2009-07-18 14:52:58 +0200 | [diff] [blame] | 757 | if (!(valid_hooks & (1 << h))) |
| 758 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | if ((unsigned char *)e - base == hook_entries[h]) |
| 760 | newinfo->hook_entry[h] = hook_entries[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 761 | if ((unsigned char *)e - base == underflows[h]) { |
Jan Engelhardt | e2fe35c | 2009-07-18 15:22:30 +0200 | [diff] [blame] | 762 | if (!check_underflow(e)) { |
| 763 | pr_err("Underflows must be unconditional and " |
| 764 | "use the STANDARD target with " |
| 765 | "ACCEPT/DROP\n"); |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 766 | return -EINVAL; |
| 767 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | newinfo->underflow[h] = underflows[h]; |
Jan Engelhardt | 90e7d4a | 2009-07-09 22:54:53 +0200 | [diff] [blame] | 769 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | } |
| 771 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | /* Clear counters and comefrom */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 773 | e->counters = ((struct xt_counters) { 0, 0 }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | e->comefrom = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | return 0; |
| 776 | } |
| 777 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 778 | static void |
| 779 | cleanup_entry(struct ipt_entry *e, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | { |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 781 | struct xt_tgdtor_param par; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | struct ipt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 783 | struct xt_entry_match *ematch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | /* Cleanup all matches */ |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 786 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 787 | cleanup_match(ematch, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | t = ipt_get_target(e); |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 789 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 790 | par.net = net; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 791 | par.target = t->u.kernel.target; |
| 792 | par.targinfo = t->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 793 | par.family = NFPROTO_IPV4; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 794 | if (par.target->destroy != NULL) |
| 795 | par.target->destroy(&par); |
| 796 | module_put(par.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | } |
| 798 | |
| 799 | /* Checks and translates the user-supplied table segment (held in |
| 800 | newinfo) */ |
| 801 | static int |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 802 | translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0, |
| 803 | const struct ipt_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 805 | struct ipt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | unsigned int i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 807 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 809 | newinfo->size = repl->size; |
| 810 | newinfo->number = repl->num_entries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
| 812 | /* Init all hooks to impossible value. */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 813 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
| 815 | newinfo->underflow[i] = 0xFFFFFFFF; |
| 816 | } |
| 817 | |
| 818 | duprintf("translate_table: size %u\n", newinfo->size); |
| 819 | i = 0; |
| 820 | /* Walk through entries, checking offsets. */ |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 821 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 822 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 823 | entry0 + repl->size, |
| 824 | repl->hook_entry, |
| 825 | repl->underflow, |
| 826 | repl->valid_hooks); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 827 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 828 | return ret; |
| 829 | ++i; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 830 | if (strcmp(ipt_get_target(iter)->u.user.name, |
| 831 | XT_ERROR_TARGET) == 0) |
| 832 | ++newinfo->stacksize; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 833 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 835 | if (i != repl->num_entries) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | duprintf("translate_table: %u not %u entries\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 837 | i, repl->num_entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | return -EINVAL; |
| 839 | } |
| 840 | |
| 841 | /* Check hooks all assigned */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 842 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | /* Only hooks which are valid */ |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 844 | if (!(repl->valid_hooks & (1 << i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | continue; |
| 846 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { |
| 847 | duprintf("Invalid hook entry %u %u\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 848 | i, repl->hook_entry[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | return -EINVAL; |
| 850 | } |
| 851 | if (newinfo->underflow[i] == 0xFFFFFFFF) { |
| 852 | duprintf("Invalid underflow %u %u\n", |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 853 | i, repl->underflow[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | return -EINVAL; |
| 855 | } |
| 856 | } |
| 857 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 858 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 859 | return -ELOOP; |
| 860 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | /* Finally, each sanity check must pass */ |
| 862 | i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 863 | xt_entry_foreach(iter, entry0, newinfo->size) { |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 864 | ret = find_check_entry(iter, net, repl->name, repl->size); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 865 | if (ret != 0) |
| 866 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 867 | ++i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 868 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 870 | if (ret != 0) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 871 | xt_entry_foreach(iter, entry0, newinfo->size) { |
| 872 | if (i-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 873 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 874 | cleanup_entry(iter, net); |
| 875 | } |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 876 | return ret; |
| 877 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | |
| 879 | /* And one copy for every other CPU */ |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 880 | for_each_possible_cpu(i) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 881 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
| 882 | memcpy(newinfo->entries[i], entry0, newinfo->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | } |
| 884 | |
| 885 | return ret; |
| 886 | } |
| 887 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | static void |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 889 | get_counters(const struct xt_table_info *t, |
| 890 | struct xt_counters counters[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 892 | struct ipt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | unsigned int cpu; |
| 894 | unsigned int i; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 895 | unsigned int curcpu; |
| 896 | |
| 897 | /* Instead of clearing (by a previous call to memset()) |
| 898 | * the counters and using adds, we set the counters |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 899 | * with data used by 'current' CPU. |
| 900 | * |
| 901 | * Bottom half has to be disabled to prevent deadlock |
| 902 | * if new softirq were to run and call ipt_do_table |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 903 | */ |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 904 | local_bh_disable(); |
| 905 | curcpu = smp_processor_id(); |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 906 | |
| 907 | i = 0; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 908 | xt_entry_foreach(iter, t->entries[curcpu], t->size) { |
| 909 | SET_COUNTER(counters[i], iter->counters.bcnt, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 910 | iter->counters.pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 911 | ++i; |
| 912 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 914 | for_each_possible_cpu(cpu) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 915 | if (cpu == curcpu) |
| 916 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | i = 0; |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 918 | xt_info_wrlock(cpu); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 919 | xt_entry_foreach(iter, t->entries[cpu], t->size) { |
| 920 | ADD_COUNTER(counters[i], iter->counters.bcnt, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 921 | iter->counters.pcnt); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 922 | ++i; /* macro does multi eval of i */ |
| 923 | } |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 924 | xt_info_wrunlock(cpu); |
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 | local_bh_enable(); |
| 927 | } |
| 928 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 929 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 931 | unsigned int countersize; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 932 | struct xt_counters *counters; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 933 | const struct xt_table_info *private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | |
| 935 | /* We need atomic snapshot of counters: rest doesn't change |
| 936 | (other than comefrom, which userspace doesn't care |
| 937 | about). */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 938 | countersize = sizeof(struct xt_counters) * private->number; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 939 | counters = vmalloc_node(countersize, numa_node_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | |
| 941 | if (counters == NULL) |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 942 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 944 | get_counters(private, counters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 946 | return counters; |
| 947 | } |
| 948 | |
| 949 | static int |
| 950 | copy_entries_to_user(unsigned int total_size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 951 | const struct xt_table *table, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 952 | void __user *userptr) |
| 953 | { |
| 954 | unsigned int off, num; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 955 | const struct ipt_entry *e; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 956 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 957 | const struct xt_table_info *private = table->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 958 | int ret = 0; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 959 | const void *loc_cpu_entry; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 960 | |
| 961 | counters = alloc_counters(table); |
| 962 | if (IS_ERR(counters)) |
| 963 | return PTR_ERR(counters); |
| 964 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 965 | /* choose the copy that is on our node/cpu, ... |
| 966 | * This choice is lazy (because current thread is |
| 967 | * allowed to migrate to another cpu) |
| 968 | */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 969 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 970 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | ret = -EFAULT; |
| 972 | goto free_counters; |
| 973 | } |
| 974 | |
| 975 | /* FIXME: use iterator macros --RR */ |
| 976 | /* ... then go back and fix counters and names */ |
| 977 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ |
| 978 | unsigned int i; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 979 | const struct ipt_entry_match *m; |
| 980 | const struct ipt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 982 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | if (copy_to_user(userptr + off |
| 984 | + offsetof(struct ipt_entry, counters), |
| 985 | &counters[num], |
| 986 | sizeof(counters[num])) != 0) { |
| 987 | ret = -EFAULT; |
| 988 | goto free_counters; |
| 989 | } |
| 990 | |
| 991 | for (i = sizeof(struct ipt_entry); |
| 992 | i < e->target_offset; |
| 993 | i += m->u.match_size) { |
| 994 | m = (void *)e + i; |
| 995 | |
| 996 | if (copy_to_user(userptr + off + i |
| 997 | + offsetof(struct ipt_entry_match, |
| 998 | u.user.name), |
| 999 | m->u.kernel.match->name, |
| 1000 | strlen(m->u.kernel.match->name)+1) |
| 1001 | != 0) { |
| 1002 | ret = -EFAULT; |
| 1003 | goto free_counters; |
| 1004 | } |
| 1005 | } |
| 1006 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1007 | t = ipt_get_target_c(e); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | if (copy_to_user(userptr + off + e->target_offset |
| 1009 | + offsetof(struct ipt_entry_target, |
| 1010 | u.user.name), |
| 1011 | t->u.kernel.target->name, |
| 1012 | strlen(t->u.kernel.target->name)+1) != 0) { |
| 1013 | ret = -EFAULT; |
| 1014 | goto free_counters; |
| 1015 | } |
| 1016 | } |
| 1017 | |
| 1018 | free_counters: |
| 1019 | vfree(counters); |
| 1020 | return ret; |
| 1021 | } |
| 1022 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1023 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 1024 | static void compat_standard_from_user(void *dst, const void *src) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1025 | { |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1026 | int v = *(compat_int_t *)src; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1027 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1028 | if (v > 0) |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1029 | v += xt_compat_calc_jump(AF_INET, v); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1030 | memcpy(dst, &v, sizeof(v)); |
| 1031 | } |
| 1032 | |
Jan Engelhardt | 739674f | 2009-06-26 08:23:19 +0200 | [diff] [blame] | 1033 | static int compat_standard_to_user(void __user *dst, const void *src) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1034 | { |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1035 | compat_int_t cv = *(int *)src; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1036 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1037 | if (cv > 0) |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1038 | cv -= xt_compat_calc_jump(AF_INET, cv); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1039 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1040 | } |
| 1041 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1042 | static int compat_calc_entry(const struct ipt_entry *e, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1043 | const struct xt_table_info *info, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1044 | const void *base, struct xt_table_info *newinfo) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1045 | { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1046 | const struct xt_entry_match *ematch; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1047 | const struct ipt_entry_target *t; |
Dmitry Mishin | e5b5ef7 | 2007-01-04 12:14:41 -0800 | [diff] [blame] | 1048 | unsigned int entry_offset; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1049 | int off, i, ret; |
| 1050 | |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1051 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1052 | entry_offset = (void *)e - base; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1053 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1054 | off += xt_compat_match_offset(ematch->u.kernel.match); |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1055 | t = ipt_get_target_c(e); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1056 | off += xt_compat_target_offset(t->u.kernel.target); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1057 | newinfo->size -= off; |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1058 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1059 | if (ret) |
| 1060 | return ret; |
| 1061 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1062 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1063 | if (info->hook_entry[i] && |
| 1064 | (e < (struct ipt_entry *)(base + info->hook_entry[i]))) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1065 | newinfo->hook_entry[i] -= off; |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1066 | if (info->underflow[i] && |
| 1067 | (e < (struct ipt_entry *)(base + info->underflow[i]))) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1068 | newinfo->underflow[i] -= off; |
| 1069 | } |
| 1070 | return 0; |
| 1071 | } |
| 1072 | |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 1073 | static int compat_table_info(const struct xt_table_info *info, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1074 | struct xt_table_info *newinfo) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1075 | { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1076 | struct ipt_entry *iter; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1077 | void *loc_cpu_entry; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1078 | int ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1079 | |
| 1080 | if (!newinfo || !info) |
| 1081 | return -EINVAL; |
| 1082 | |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 1083 | /* we dont care about newinfo->entries[] */ |
| 1084 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
| 1085 | newinfo->initial_entries = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1086 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1087 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
| 1088 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); |
| 1089 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1090 | return ret; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1091 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1092 | return 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1093 | } |
| 1094 | #endif |
| 1095 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1096 | static int get_info(struct net *net, void __user *user, |
| 1097 | const int *len, int compat) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1098 | { |
| 1099 | char name[IPT_TABLE_MAXNAMELEN]; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1100 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1101 | int ret; |
| 1102 | |
| 1103 | if (*len != sizeof(struct ipt_getinfo)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1104 | duprintf("length %u != %zu\n", *len, |
| 1105 | sizeof(struct ipt_getinfo)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1106 | return -EINVAL; |
| 1107 | } |
| 1108 | |
| 1109 | if (copy_from_user(name, user, sizeof(name)) != 0) |
| 1110 | return -EFAULT; |
| 1111 | |
| 1112 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; |
| 1113 | #ifdef CONFIG_COMPAT |
| 1114 | if (compat) |
| 1115 | xt_compat_lock(AF_INET); |
| 1116 | #endif |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1117 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1118 | "iptable_%s", name); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1119 | if (t && !IS_ERR(t)) { |
| 1120 | struct ipt_getinfo info; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1121 | const struct xt_table_info *private = t->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1122 | #ifdef CONFIG_COMPAT |
Alexey Dobriyan | 14c7dbe | 2010-02-08 11:17:43 -0800 | [diff] [blame] | 1123 | struct xt_table_info tmp; |
| 1124 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1125 | if (compat) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1126 | ret = compat_table_info(private, &tmp); |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1127 | xt_compat_flush_offsets(AF_INET); |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1128 | private = &tmp; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1129 | } |
| 1130 | #endif |
| 1131 | info.valid_hooks = t->valid_hooks; |
| 1132 | memcpy(info.hook_entry, private->hook_entry, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1133 | sizeof(info.hook_entry)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1134 | memcpy(info.underflow, private->underflow, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1135 | sizeof(info.underflow)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1136 | info.num_entries = private->number; |
| 1137 | info.size = private->size; |
| 1138 | strcpy(info.name, name); |
| 1139 | |
| 1140 | if (copy_to_user(user, &info, *len) != 0) |
| 1141 | ret = -EFAULT; |
| 1142 | else |
| 1143 | ret = 0; |
| 1144 | |
| 1145 | xt_table_unlock(t); |
| 1146 | module_put(t->me); |
| 1147 | } else |
| 1148 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1149 | #ifdef CONFIG_COMPAT |
| 1150 | if (compat) |
| 1151 | xt_compat_unlock(AF_INET); |
| 1152 | #endif |
| 1153 | return ret; |
| 1154 | } |
| 1155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1157 | get_entries(struct net *net, struct ipt_get_entries __user *uptr, |
| 1158 | const int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | { |
| 1160 | int ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1161 | struct ipt_get_entries get; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1162 | struct xt_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1164 | if (*len < sizeof(get)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1165 | duprintf("get_entries: %u < %zu\n", *len, sizeof(get)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1166 | return -EINVAL; |
| 1167 | } |
| 1168 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1169 | return -EFAULT; |
| 1170 | if (*len != sizeof(struct ipt_get_entries) + get.size) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1171 | duprintf("get_entries: %u != %zu\n", |
| 1172 | *len, sizeof(get) + get.size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1173 | return -EINVAL; |
| 1174 | } |
| 1175 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1176 | t = xt_find_table_lock(net, AF_INET, get.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | if (t && !IS_ERR(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1178 | const struct xt_table_info *private = t->private; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1179 | duprintf("t->private->number = %u\n", private->number); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1180 | if (get.size == private->size) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1181 | ret = copy_entries_to_user(private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | t, uptr->entrytable); |
| 1183 | else { |
| 1184 | duprintf("get_entries: I've got %u not %u!\n", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1185 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1186 | ret = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | } |
| 1188 | module_put(t->me); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1189 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | } else |
| 1191 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1192 | |
| 1193 | return ret; |
| 1194 | } |
| 1195 | |
| 1196 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1197 | __do_replace(struct net *net, const char *name, unsigned int valid_hooks, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1198 | struct xt_table_info *newinfo, unsigned int num_counters, |
| 1199 | void __user *counters_ptr) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1200 | { |
| 1201 | int ret; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1202 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1203 | struct xt_table_info *oldinfo; |
| 1204 | struct xt_counters *counters; |
| 1205 | void *loc_cpu_old_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1206 | struct ipt_entry *iter; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1207 | |
| 1208 | ret = 0; |
| 1209 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); |
| 1210 | if (!counters) { |
| 1211 | ret = -ENOMEM; |
| 1212 | goto out; |
| 1213 | } |
| 1214 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1215 | t = try_then_request_module(xt_find_table_lock(net, AF_INET, name), |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1216 | "iptable_%s", name); |
| 1217 | if (!t || IS_ERR(t)) { |
| 1218 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1219 | goto free_newinfo_counters_untrans; |
| 1220 | } |
| 1221 | |
| 1222 | /* You lied! */ |
| 1223 | if (valid_hooks != t->valid_hooks) { |
| 1224 | duprintf("Valid hook crap: %08X vs %08X\n", |
| 1225 | valid_hooks, t->valid_hooks); |
| 1226 | ret = -EINVAL; |
| 1227 | goto put_module; |
| 1228 | } |
| 1229 | |
| 1230 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
| 1231 | if (!oldinfo) |
| 1232 | goto put_module; |
| 1233 | |
| 1234 | /* Update module usage count based on number of rules */ |
| 1235 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", |
| 1236 | oldinfo->number, oldinfo->initial_entries, newinfo->number); |
| 1237 | if ((oldinfo->number > oldinfo->initial_entries) || |
| 1238 | (newinfo->number <= oldinfo->initial_entries)) |
| 1239 | module_put(t->me); |
| 1240 | if ((oldinfo->number > oldinfo->initial_entries) && |
| 1241 | (newinfo->number <= oldinfo->initial_entries)) |
| 1242 | module_put(t->me); |
| 1243 | |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1244 | /* Get the old counters, and synchronize with replace */ |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1245 | get_counters(oldinfo, counters); |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1246 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1247 | /* Decrease module usage counts and free resource */ |
| 1248 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1249 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1250 | cleanup_entry(iter, net); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1251 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1252 | xt_free_table_info(oldinfo); |
| 1253 | if (copy_to_user(counters_ptr, counters, |
| 1254 | sizeof(struct xt_counters) * num_counters) != 0) |
| 1255 | ret = -EFAULT; |
| 1256 | vfree(counters); |
| 1257 | xt_table_unlock(t); |
| 1258 | return ret; |
| 1259 | |
| 1260 | put_module: |
| 1261 | module_put(t->me); |
| 1262 | xt_table_unlock(t); |
| 1263 | free_newinfo_counters_untrans: |
| 1264 | vfree(counters); |
| 1265 | out: |
| 1266 | return ret; |
| 1267 | } |
| 1268 | |
| 1269 | static int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1270 | do_replace(struct net *net, const void __user *user, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | { |
| 1272 | int ret; |
| 1273 | struct ipt_replace tmp; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1274 | struct xt_table_info *newinfo; |
| 1275 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1276 | struct ipt_entry *iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | |
| 1278 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1279 | return -EFAULT; |
| 1280 | |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1281 | /* overflow check */ |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1282 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1283 | return -ENOMEM; |
| 1284 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1285 | newinfo = xt_alloc_table_info(tmp.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | if (!newinfo) |
| 1287 | return -ENOMEM; |
| 1288 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1289 | /* choose the copy that is on our node/cpu */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1290 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 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) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1299 | goto free_newinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 1301 | duprintf("Translated table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1303 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1304 | tmp.num_counters, tmp.counters); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1305 | if (ret) |
| 1306 | goto free_newinfo_untrans; |
| 1307 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -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, |
| 1319 | unsigned int len, int compat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | { |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1321 | unsigned int i, curcpu; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1322 | struct xt_counters_info tmp; |
| 1323 | struct xt_counters *paddc; |
| 1324 | unsigned int num_counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1325 | const char *name; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1326 | int size; |
| 1327 | void *ptmp; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | int ret = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1331 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1332 | struct ipt_entry *iter; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -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 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -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 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -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 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1363 | paddc = vmalloc_node(len - size, numa_node_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | if (!paddc) |
| 1365 | return -ENOMEM; |
| 1366 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -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 | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1372 | t = xt_find_table_lock(net, AF_INET, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | if (!t || IS_ERR(t)) { |
| 1374 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1375 | goto free; |
| 1376 | } |
| 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; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -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 | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1386 | /* Choose the copy that is on our node */ |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1387 | curcpu = smp_processor_id(); |
| 1388 | loc_cpu_entry = private->entries[curcpu]; |
| 1389 | xt_info_wrlock(curcpu); |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1390 | xt_entry_foreach(iter, loc_cpu_entry, private->size) { |
| 1391 | ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt); |
| 1392 | ++i; |
| 1393 | } |
Stephen Hemminger | 942e4a2 | 2009-04-28 22:36:33 -0700 | [diff] [blame] | 1394 | xt_info_wrunlock(curcpu); |
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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | module_put(t->me); |
| 1399 | free: |
| 1400 | vfree(paddc); |
| 1401 | |
| 1402 | return ret; |
| 1403 | } |
| 1404 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1405 | #ifdef CONFIG_COMPAT |
| 1406 | struct compat_ipt_replace { |
| 1407 | char name[IPT_TABLE_MAXNAMELEN]; |
| 1408 | u32 valid_hooks; |
| 1409 | u32 num_entries; |
| 1410 | u32 size; |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1411 | u32 hook_entry[NF_INET_NUMHOOKS]; |
| 1412 | u32 underflow[NF_INET_NUMHOOKS]; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1413 | u32 num_counters; |
| 1414 | compat_uptr_t counters; /* struct ipt_counters * */ |
| 1415 | struct compat_ipt_entry entries[0]; |
| 1416 | }; |
| 1417 | |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1418 | static int |
| 1419 | compat_copy_entry_to_user(struct ipt_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) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1422 | { |
Al Viro | 3e597c6 | 2006-09-24 23:42:20 +0100 | [diff] [blame] | 1423 | struct ipt_entry_target *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1424 | struct compat_ipt_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; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1429 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1430 | origsize = *size; |
| 1431 | ce = (struct compat_ipt_entry __user *)*dstptr; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1432 | if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 || |
| 1433 | copy_to_user(&ce->counters, &counters[i], |
| 1434 | sizeof(counters[i])) != 0) |
| 1435 | return -EFAULT; |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1436 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1437 | *dstptr += sizeof(struct compat_ipt_entry); |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1438 | *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_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 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1445 | target_offset = e->target_offset - (origsize - *size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1446 | t = ipt_get_target(e); |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1447 | ret = xt_compat_target_to_user(t, dstptr, size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1448 | if (ret) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1449 | return ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -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; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1454 | return 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1455 | } |
| 1456 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1457 | static int |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1458 | compat_find_calc_match(struct ipt_entry_match *m, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1459 | const char *name, |
| 1460 | const struct ipt_ip *ip, |
| 1461 | unsigned int hookmask, |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1462 | int *size) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1463 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1464 | struct xt_match *match; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1465 | |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 1466 | match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name, |
| 1467 | m->u.user.revision); |
| 1468 | if (IS_ERR(match)) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1469 | duprintf("compat_check_calc_match: `%s' not found\n", |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1470 | m->u.user.name); |
Jan Engelhardt | fd0ec0e | 2009-07-10 19:27:47 +0200 | [diff] [blame] | 1471 | return PTR_ERR(match); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1472 | } |
| 1473 | m->u.kernel.match = match; |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1474 | *size += xt_compat_match_offset(match); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1475 | return 0; |
| 1476 | } |
| 1477 | |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1478 | static void compat_release_entry(struct compat_ipt_entry *e) |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1479 | { |
| 1480 | struct ipt_entry_target *t; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1481 | struct xt_entry_match *ematch; |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1482 | |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1483 | /* Cleanup all matches */ |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1484 | xt_ematch_foreach(ematch, e) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1485 | module_put(ematch->u.kernel.match->me); |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1486 | t = compat_ipt_get_target(e); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1487 | module_put(t->u.kernel.target->me); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1488 | } |
| 1489 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1490 | static int |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1491 | check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1492 | struct xt_table_info *newinfo, |
| 1493 | unsigned int *size, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1494 | const unsigned char *base, |
| 1495 | const unsigned char *limit, |
| 1496 | const unsigned int *hook_entries, |
| 1497 | const unsigned int *underflows, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1498 | const char *name) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1499 | { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1500 | struct xt_entry_match *ematch; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1501 | struct ipt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1502 | struct xt_target *target; |
Dmitry Mishin | e5b5ef7 | 2007-01-04 12:14:41 -0800 | [diff] [blame] | 1503 | unsigned int entry_offset; |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1504 | unsigned int j; |
| 1505 | int ret, off, h; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1506 | |
| 1507 | duprintf("check_compat_entry_size_and_hooks %p\n", e); |
Joe Perches | 3666ed1 | 2009-11-23 23:17:06 +0100 | [diff] [blame] | 1508 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 || |
| 1509 | (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1510 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
| 1511 | return -EINVAL; |
| 1512 | } |
| 1513 | |
| 1514 | if (e->next_offset < sizeof(struct compat_ipt_entry) + |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1515 | sizeof(struct compat_xt_entry_target)) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1516 | duprintf("checking: element %p size %u\n", |
| 1517 | e, e->next_offset); |
| 1518 | return -EINVAL; |
| 1519 | } |
| 1520 | |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1521 | /* For purposes of check_entry casting the compat entry is fine */ |
| 1522 | ret = check_entry((struct ipt_entry *)e, name); |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 1523 | if (ret) |
| 1524 | return ret; |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 1525 | |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1526 | off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1527 | entry_offset = (void *)e - (void *)base; |
| 1528 | j = 0; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1529 | xt_ematch_foreach(ematch, e) { |
| 1530 | ret = compat_find_calc_match(ematch, name, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1531 | &e->ip, e->comefrom, &off); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1532 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1533 | goto release_matches; |
| 1534 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1535 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1536 | |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1537 | t = compat_ipt_get_target(e); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1538 | target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name, |
| 1539 | t->u.user.revision); |
| 1540 | if (IS_ERR(target)) { |
Dmitry Mishin | a96be24 | 2006-12-12 00:29:26 -0800 | [diff] [blame] | 1541 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1542 | t->u.user.name); |
Jan Engelhardt | d2a7b6b | 2009-07-10 18:55:11 +0200 | [diff] [blame] | 1543 | ret = PTR_ERR(target); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1544 | goto release_matches; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1545 | } |
| 1546 | t->u.kernel.target = target; |
| 1547 | |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1548 | off += xt_compat_target_offset(target); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1549 | *size += off; |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1550 | ret = xt_compat_add_offset(AF_INET, entry_offset, off); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1551 | if (ret) |
| 1552 | goto out; |
| 1553 | |
| 1554 | /* Check hooks & underflows */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1555 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1556 | if ((unsigned char *)e - base == hook_entries[h]) |
| 1557 | newinfo->hook_entry[h] = hook_entries[h]; |
| 1558 | if ((unsigned char *)e - base == underflows[h]) |
| 1559 | newinfo->underflow[h] = underflows[h]; |
| 1560 | } |
| 1561 | |
| 1562 | /* Clear counters and comefrom */ |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1563 | memset(&e->counters, 0, sizeof(e->counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1564 | e->comefrom = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1565 | return 0; |
Patrick McHardy | bec71b1 | 2006-09-20 12:04:08 -0700 | [diff] [blame] | 1566 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1567 | out: |
Patrick McHardy | bec71b1 | 2006-09-20 12:04:08 -0700 | [diff] [blame] | 1568 | module_put(t->u.kernel.target->me); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1569 | release_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1570 | xt_ematch_foreach(ematch, e) { |
| 1571 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1572 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1573 | module_put(ematch->u.kernel.match->me); |
| 1574 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1575 | return ret; |
| 1576 | } |
| 1577 | |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1578 | static int |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1579 | compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1580 | unsigned int *size, const char *name, |
| 1581 | struct xt_table_info *newinfo, unsigned char *base) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1582 | { |
| 1583 | struct ipt_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 1584 | struct xt_target *target; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1585 | struct ipt_entry *de; |
| 1586 | unsigned int origsize; |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1587 | int ret, h; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1588 | struct xt_entry_match *ematch; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1589 | |
| 1590 | ret = 0; |
| 1591 | origsize = *size; |
| 1592 | de = (struct ipt_entry *)*dstptr; |
| 1593 | memcpy(de, e, sizeof(struct ipt_entry)); |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1594 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1595 | |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1596 | *dstptr += sizeof(struct ipt_entry); |
Patrick McHardy | 30c08c4 | 2007-12-17 21:47:14 -0800 | [diff] [blame] | 1597 | *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); |
| 1598 | |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1599 | xt_ematch_foreach(ematch, e) { |
| 1600 | ret = xt_compat_match_from_user(ematch, dstptr, size); |
| 1601 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1602 | return ret; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1603 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1604 | de->target_offset = e->target_offset - (origsize - *size); |
Patrick McHardy | 73cd598 | 2007-12-17 21:47:32 -0800 | [diff] [blame] | 1605 | t = compat_ipt_get_target(e); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1606 | target = t->u.kernel.target; |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 1607 | xt_compat_target_from_user(t, dstptr, size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1608 | |
| 1609 | de->next_offset = e->next_offset - (origsize - *size); |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1610 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1611 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
| 1612 | newinfo->hook_entry[h] -= origsize - *size; |
| 1613 | if ((unsigned char *)de - base < newinfo->underflow[h]) |
| 1614 | newinfo->underflow[h] -= origsize - *size; |
| 1615 | } |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1616 | return ret; |
| 1617 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1618 | |
Denys Vlasenko | 022748a | 2008-01-14 23:44:05 -0800 | [diff] [blame] | 1619 | static int |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1620 | compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1621 | { |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1622 | struct xt_entry_match *ematch; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1623 | struct xt_mtchk_param mtpar; |
Patrick McHardy | b0a6363 | 2008-01-31 04:10:18 -0800 | [diff] [blame] | 1624 | unsigned int j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1625 | int ret = 0; |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1626 | |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1627 | j = 0; |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 1628 | mtpar.net = net; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 1629 | mtpar.table = name; |
| 1630 | mtpar.entryinfo = &e->ip; |
| 1631 | mtpar.hook_mask = e->comefrom; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 1632 | mtpar.family = NFPROTO_IPV4; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1633 | xt_ematch_foreach(ematch, e) { |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1634 | ret = check_match(ematch, &mtpar); |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1635 | if (ret != 0) |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1636 | goto cleanup_matches; |
| 1637 | ++j; |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1638 | } |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1639 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 1640 | ret = check_target(e, net, name); |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1641 | if (ret) |
| 1642 | goto cleanup_matches; |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1643 | return 0; |
| 1644 | |
| 1645 | cleanup_matches: |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1646 | xt_ematch_foreach(ematch, e) { |
| 1647 | if (j-- == 0) |
Jan Engelhardt | dcea992 | 2010-02-24 18:34:48 +0100 | [diff] [blame] | 1648 | break; |
Jan Engelhardt | 6bdb331 | 2010-02-24 18:35:37 +0100 | [diff] [blame] | 1649 | cleanup_match(ematch, net); |
| 1650 | } |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1651 | return ret; |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1652 | } |
| 1653 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1654 | static int |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 1655 | translate_compat_table(struct net *net, |
| 1656 | const char *name, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1657 | unsigned int valid_hooks, |
| 1658 | struct xt_table_info **pinfo, |
| 1659 | void **pentry0, |
| 1660 | unsigned int total_size, |
| 1661 | unsigned int number, |
| 1662 | unsigned int *hook_entries, |
| 1663 | unsigned int *underflows) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1664 | { |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1665 | unsigned int i, j; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1666 | struct xt_table_info *newinfo, *info; |
| 1667 | void *pos, *entry0, *entry1; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1668 | struct compat_ipt_entry *iter0; |
| 1669 | struct ipt_entry *iter1; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1670 | unsigned int size; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1671 | int ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1672 | |
| 1673 | info = *pinfo; |
| 1674 | entry0 = *pentry0; |
| 1675 | size = total_size; |
| 1676 | info->number = number; |
| 1677 | |
| 1678 | /* Init all hooks to impossible value. */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1679 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1680 | info->hook_entry[i] = 0xFFFFFFFF; |
| 1681 | info->underflow[i] = 0xFFFFFFFF; |
| 1682 | } |
| 1683 | |
| 1684 | duprintf("translate_compat_table: size %u\n", info->size); |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1685 | j = 0; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1686 | xt_compat_lock(AF_INET); |
| 1687 | /* Walk through entries, checking offsets. */ |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1688 | xt_entry_foreach(iter0, entry0, total_size) { |
| 1689 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1690 | entry0, |
| 1691 | entry0 + total_size, |
| 1692 | hook_entries, |
| 1693 | underflows, |
| 1694 | name); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1695 | if (ret != 0) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1696 | goto out_unlock; |
| 1697 | ++j; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1698 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1699 | |
| 1700 | ret = -EINVAL; |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1701 | if (j != number) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1702 | duprintf("translate_compat_table: %u not %u entries\n", |
Dmitry Mishin | 920b868 | 2006-10-30 15:14:27 -0800 | [diff] [blame] | 1703 | j, number); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1704 | goto out_unlock; |
| 1705 | } |
| 1706 | |
| 1707 | /* Check hooks all assigned */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1708 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1709 | /* Only hooks which are valid */ |
| 1710 | if (!(valid_hooks & (1 << i))) |
| 1711 | continue; |
| 1712 | if (info->hook_entry[i] == 0xFFFFFFFF) { |
| 1713 | duprintf("Invalid hook entry %u %u\n", |
| 1714 | i, hook_entries[i]); |
| 1715 | goto out_unlock; |
| 1716 | } |
| 1717 | if (info->underflow[i] == 0xFFFFFFFF) { |
| 1718 | duprintf("Invalid underflow %u %u\n", |
| 1719 | i, underflows[i]); |
| 1720 | goto out_unlock; |
| 1721 | } |
| 1722 | } |
| 1723 | |
| 1724 | ret = -ENOMEM; |
| 1725 | newinfo = xt_alloc_table_info(size); |
| 1726 | if (!newinfo) |
| 1727 | goto out_unlock; |
| 1728 | |
| 1729 | newinfo->number = number; |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 1730 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1731 | newinfo->hook_entry[i] = info->hook_entry[i]; |
| 1732 | newinfo->underflow[i] = info->underflow[i]; |
| 1733 | } |
| 1734 | entry1 = newinfo->entries[raw_smp_processor_id()]; |
| 1735 | pos = entry1; |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1736 | size = total_size; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1737 | xt_entry_foreach(iter0, entry0, total_size) { |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1738 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
| 1739 | name, newinfo, entry1); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1740 | if (ret != 0) |
| 1741 | break; |
| 1742 | } |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1743 | xt_compat_flush_offsets(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1744 | xt_compat_unlock(AF_INET); |
| 1745 | if (ret) |
| 1746 | goto free_newinfo; |
| 1747 | |
| 1748 | ret = -ELOOP; |
| 1749 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) |
| 1750 | goto free_newinfo; |
| 1751 | |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1752 | i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1753 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1754 | ret = compat_check_entry(iter1, net, name); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1755 | if (ret != 0) |
| 1756 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1757 | ++i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1758 | } |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1759 | if (ret) { |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1760 | /* |
| 1761 | * The first i matches need cleanup_entry (calls ->destroy) |
| 1762 | * because they had called ->check already. The other j-i |
| 1763 | * entries need only release. |
| 1764 | */ |
| 1765 | int skip = i; |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1766 | j -= i; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1767 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
| 1768 | if (skip-- > 0) |
| 1769 | continue; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1770 | if (j-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1771 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1772 | compat_release_entry(iter0); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1773 | } |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1774 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
| 1775 | if (i-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1776 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1777 | cleanup_entry(iter1, net); |
| 1778 | } |
Dmitry Mishin | 4c1b52b | 2007-06-05 12:56:09 -0700 | [diff] [blame] | 1779 | xt_free_table_info(newinfo); |
| 1780 | return ret; |
| 1781 | } |
Dmitry Mishin | f6677f4 | 2006-12-05 13:44:07 -0800 | [diff] [blame] | 1782 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1783 | /* And one copy for every other CPU */ |
Andrew Morton | fb1bb34 | 2006-06-25 05:46:43 -0700 | [diff] [blame] | 1784 | for_each_possible_cpu(i) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1785 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
| 1786 | memcpy(newinfo->entries[i], entry1, newinfo->size); |
| 1787 | |
| 1788 | *pinfo = newinfo; |
| 1789 | *pentry0 = entry1; |
| 1790 | xt_free_table_info(info); |
| 1791 | return 0; |
| 1792 | |
| 1793 | free_newinfo: |
| 1794 | xt_free_table_info(newinfo); |
| 1795 | out: |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1796 | xt_entry_foreach(iter0, entry0, total_size) { |
| 1797 | if (j-- == 0) |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1798 | break; |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1799 | compat_release_entry(iter0); |
| 1800 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1801 | return ret; |
| 1802 | out_unlock: |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1803 | xt_compat_flush_offsets(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1804 | xt_compat_unlock(AF_INET); |
| 1805 | goto out; |
| 1806 | } |
| 1807 | |
| 1808 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1809 | compat_do_replace(struct net *net, void __user *user, unsigned int len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1810 | { |
| 1811 | int ret; |
| 1812 | struct compat_ipt_replace tmp; |
| 1813 | struct xt_table_info *newinfo; |
| 1814 | void *loc_cpu_entry; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1815 | struct ipt_entry *iter; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1816 | |
| 1817 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1818 | return -EFAULT; |
| 1819 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1820 | /* overflow check */ |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 1821 | if (tmp.size >= INT_MAX / num_possible_cpus()) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1822 | return -ENOMEM; |
| 1823 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1824 | return -ENOMEM; |
| 1825 | |
| 1826 | newinfo = xt_alloc_table_info(tmp.size); |
| 1827 | if (!newinfo) |
| 1828 | return -ENOMEM; |
| 1829 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1830 | /* choose the copy that is on our node/cpu */ |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1831 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 1832 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
| 1833 | tmp.size) != 0) { |
| 1834 | ret = -EFAULT; |
| 1835 | goto free_newinfo; |
| 1836 | } |
| 1837 | |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 1838 | ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1839 | &newinfo, &loc_cpu_entry, tmp.size, |
| 1840 | tmp.num_entries, tmp.hook_entry, |
| 1841 | tmp.underflow); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1842 | if (ret != 0) |
| 1843 | goto free_newinfo; |
| 1844 | |
| 1845 | duprintf("compat_do_replace: Translated table\n"); |
| 1846 | |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1847 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1848 | tmp.num_counters, compat_ptr(tmp.counters)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1849 | if (ret) |
| 1850 | goto free_newinfo_untrans; |
| 1851 | return 0; |
| 1852 | |
| 1853 | free_newinfo_untrans: |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1854 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 1855 | cleanup_entry(iter, net); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1856 | free_newinfo: |
| 1857 | xt_free_table_info(newinfo); |
| 1858 | return ret; |
| 1859 | } |
| 1860 | |
| 1861 | static int |
| 1862 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1863 | unsigned int len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1864 | { |
| 1865 | int ret; |
| 1866 | |
| 1867 | if (!capable(CAP_NET_ADMIN)) |
| 1868 | return -EPERM; |
| 1869 | |
| 1870 | switch (cmd) { |
| 1871 | case IPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1872 | ret = compat_do_replace(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1873 | break; |
| 1874 | |
| 1875 | case IPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1876 | ret = do_add_counters(sock_net(sk), user, len, 1); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1877 | break; |
| 1878 | |
| 1879 | default: |
| 1880 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); |
| 1881 | ret = -EINVAL; |
| 1882 | } |
| 1883 | |
| 1884 | return ret; |
| 1885 | } |
| 1886 | |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1887 | struct compat_ipt_get_entries { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1888 | char name[IPT_TABLE_MAXNAMELEN]; |
| 1889 | compat_uint_t size; |
| 1890 | struct compat_ipt_entry entrytable[0]; |
| 1891 | }; |
| 1892 | |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1893 | static int |
| 1894 | compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table, |
| 1895 | void __user *userptr) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1896 | { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1897 | struct xt_counters *counters; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1898 | const struct xt_table_info *private = table->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1899 | void __user *pos; |
| 1900 | unsigned int size; |
| 1901 | int ret = 0; |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1902 | const void *loc_cpu_entry; |
Patrick McHardy | a18aa31 | 2007-12-12 10:35:16 -0800 | [diff] [blame] | 1903 | unsigned int i = 0; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1904 | struct ipt_entry *iter; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1905 | |
| 1906 | counters = alloc_counters(table); |
| 1907 | if (IS_ERR(counters)) |
| 1908 | return PTR_ERR(counters); |
| 1909 | |
| 1910 | /* choose the copy that is on our node/cpu, ... |
| 1911 | * This choice is lazy (because current thread is |
| 1912 | * allowed to migrate to another cpu) |
| 1913 | */ |
| 1914 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
| 1915 | pos = userptr; |
| 1916 | size = total_size; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1917 | xt_entry_foreach(iter, loc_cpu_entry, total_size) { |
| 1918 | ret = compat_copy_entry_to_user(iter, &pos, |
Jan Engelhardt | 6b4ff2d | 2010-02-26 17:53:31 +0100 | [diff] [blame] | 1919 | &size, counters, i++); |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 1920 | if (ret != 0) |
| 1921 | break; |
| 1922 | } |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1923 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1924 | vfree(counters); |
| 1925 | return ret; |
| 1926 | } |
| 1927 | |
| 1928 | static int |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1929 | compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr, |
| 1930 | int *len) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1931 | { |
| 1932 | int ret; |
| 1933 | struct compat_ipt_get_entries get; |
Jan Engelhardt | e60a13e | 2007-02-07 15:12:33 -0800 | [diff] [blame] | 1934 | struct xt_table *t; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1935 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1936 | if (*len < sizeof(get)) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1937 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1938 | return -EINVAL; |
| 1939 | } |
| 1940 | |
| 1941 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1942 | return -EFAULT; |
| 1943 | |
| 1944 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
Patrick McHardy | c9d8fe1 | 2007-12-17 21:52:15 -0800 | [diff] [blame] | 1945 | duprintf("compat_get_entries: %u != %zu\n", |
| 1946 | *len, sizeof(get) + get.size); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1947 | return -EINVAL; |
| 1948 | } |
| 1949 | |
| 1950 | xt_compat_lock(AF_INET); |
Alexey Dobriyan | 34bd137 | 2008-01-31 04:03:03 -0800 | [diff] [blame] | 1951 | t = xt_find_table_lock(net, AF_INET, get.name); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1952 | if (t && !IS_ERR(t)) { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 1953 | const struct xt_table_info *private = t->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1954 | struct xt_table_info info; |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1955 | duprintf("t->private->number = %u\n", private->number); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1956 | ret = compat_table_info(private, &info); |
| 1957 | if (!ret && get.size == info.size) { |
| 1958 | ret = compat_copy_entries_to_user(private->size, |
Patrick McHardy | 4b47824 | 2007-12-17 21:46:15 -0800 | [diff] [blame] | 1959 | t, uptr->entrytable); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1960 | } else if (!ret) { |
| 1961 | duprintf("compat_get_entries: I've got %u not %u!\n", |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 1962 | private->size, get.size); |
Patrick McHardy | 544473c | 2008-04-14 11:15:45 +0200 | [diff] [blame] | 1963 | ret = -EAGAIN; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1964 | } |
Patrick McHardy | b386d9f | 2007-12-17 21:47:48 -0800 | [diff] [blame] | 1965 | xt_compat_flush_offsets(AF_INET); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1966 | module_put(t->me); |
| 1967 | xt_table_unlock(t); |
| 1968 | } else |
| 1969 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1970 | |
| 1971 | xt_compat_unlock(AF_INET); |
| 1972 | return ret; |
| 1973 | } |
| 1974 | |
Patrick McHardy | 79030ed | 2006-09-20 12:05:08 -0700 | [diff] [blame] | 1975 | static int do_ipt_get_ctl(struct sock *, int, void __user *, int *); |
| 1976 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1977 | static int |
| 1978 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1979 | { |
| 1980 | int ret; |
| 1981 | |
Björn Steinbrink | 82fac05 | 2006-10-20 00:21:10 -0700 | [diff] [blame] | 1982 | if (!capable(CAP_NET_ADMIN)) |
| 1983 | return -EPERM; |
| 1984 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1985 | switch (cmd) { |
| 1986 | case IPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1987 | ret = get_info(sock_net(sk), user, len, 1); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1988 | break; |
| 1989 | case IPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1990 | ret = compat_get_entries(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1991 | break; |
| 1992 | default: |
Patrick McHardy | 79030ed | 2006-09-20 12:05:08 -0700 | [diff] [blame] | 1993 | ret = do_ipt_get_ctl(sk, cmd, user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1994 | } |
| 1995 | return ret; |
| 1996 | } |
| 1997 | #endif |
| 1998 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | static int |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2000 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | { |
| 2002 | int ret; |
| 2003 | |
| 2004 | if (!capable(CAP_NET_ADMIN)) |
| 2005 | return -EPERM; |
| 2006 | |
| 2007 | switch (cmd) { |
| 2008 | case IPT_SO_SET_REPLACE: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2009 | ret = do_replace(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | break; |
| 2011 | |
| 2012 | case IPT_SO_SET_ADD_COUNTERS: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2013 | ret = do_add_counters(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | break; |
| 2015 | |
| 2016 | default: |
| 2017 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); |
| 2018 | ret = -EINVAL; |
| 2019 | } |
| 2020 | |
| 2021 | return ret; |
| 2022 | } |
| 2023 | |
| 2024 | static int |
| 2025 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 2026 | { |
| 2027 | int ret; |
| 2028 | |
| 2029 | if (!capable(CAP_NET_ADMIN)) |
| 2030 | return -EPERM; |
| 2031 | |
| 2032 | switch (cmd) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2033 | case IPT_SO_GET_INFO: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2034 | ret = get_info(sock_net(sk), user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | break; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2036 | |
| 2037 | case IPT_SO_GET_ENTRIES: |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2038 | ret = get_entries(sock_net(sk), user, len); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2039 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | |
| 2041 | case IPT_SO_GET_REVISION_MATCH: |
| 2042 | case IPT_SO_GET_REVISION_TARGET: { |
| 2043 | struct ipt_get_revision rev; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2044 | int target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | |
| 2046 | if (*len != sizeof(rev)) { |
| 2047 | ret = -EINVAL; |
| 2048 | break; |
| 2049 | } |
| 2050 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { |
| 2051 | ret = -EFAULT; |
| 2052 | break; |
| 2053 | } |
| 2054 | |
| 2055 | if (cmd == IPT_SO_GET_REVISION_TARGET) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2056 | target = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | else |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2058 | target = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2060 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
| 2061 | rev.revision, |
| 2062 | target, &ret), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | "ipt_%s", rev.name); |
| 2064 | break; |
| 2065 | } |
| 2066 | |
| 2067 | default: |
| 2068 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); |
| 2069 | ret = -EINVAL; |
| 2070 | } |
| 2071 | |
| 2072 | return ret; |
| 2073 | } |
| 2074 | |
Jan Engelhardt | 35aad0f | 2009-08-24 14:56:30 +0200 | [diff] [blame] | 2075 | struct xt_table *ipt_register_table(struct net *net, |
| 2076 | const struct xt_table *table, |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2077 | const struct ipt_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2078 | { |
| 2079 | int ret; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2080 | struct xt_table_info *newinfo; |
Jan Engelhardt | f3c5c1b | 2010-04-19 16:05:10 +0200 | [diff] [blame] | 2081 | struct xt_table_info bootstrap = {0}; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2082 | void *loc_cpu_entry; |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 2083 | struct xt_table *new_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2085 | newinfo = xt_alloc_table_info(repl->size); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2086 | if (!newinfo) { |
| 2087 | ret = -ENOMEM; |
| 2088 | goto out; |
| 2089 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2091 | /* choose the copy on our node/cpu, but dont care about preemption */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2092 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 2093 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | |
Jan Engelhardt | 0f23421 | 2010-02-24 18:36:04 +0100 | [diff] [blame] | 2095 | ret = translate_table(net, newinfo, loc_cpu_entry, repl); |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2096 | if (ret != 0) |
| 2097 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2099 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
Alexey Dobriyan | a98da11 | 2008-01-31 04:01:49 -0800 | [diff] [blame] | 2100 | if (IS_ERR(new_table)) { |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2101 | ret = PTR_ERR(new_table); |
| 2102 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | } |
| 2104 | |
Alexey Dobriyan | 44d34e7 | 2008-01-31 04:02:44 -0800 | [diff] [blame] | 2105 | return new_table; |
| 2106 | |
| 2107 | out_free: |
| 2108 | xt_free_table_info(newinfo); |
| 2109 | out: |
| 2110 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | } |
| 2112 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 2113 | void ipt_unregister_table(struct net *net, struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2115 | struct xt_table_info *private; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2116 | void *loc_cpu_entry; |
Alexey Dobriyan | df20096 | 2008-01-31 04:05:34 -0800 | [diff] [blame] | 2117 | struct module *table_owner = table->me; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 2118 | struct ipt_entry *iter; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2119 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2120 | private = xt_unregister_table(table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | |
| 2122 | /* Decrease module usage counts and free resources */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2123 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
Jan Engelhardt | 72b2b1d | 2010-02-24 18:32:59 +0100 | [diff] [blame] | 2124 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
Jan Engelhardt | 0559518 | 2010-02-24 18:33:43 +0100 | [diff] [blame] | 2125 | cleanup_entry(iter, net); |
Alexey Dobriyan | df20096 | 2008-01-31 04:05:34 -0800 | [diff] [blame] | 2126 | if (private->number > private->initial_entries) |
| 2127 | module_put(table_owner); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2128 | xt_free_table_info(private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2129 | } |
| 2130 | |
| 2131 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2132 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
| 2134 | u_int8_t type, u_int8_t code, |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2135 | bool invert) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2136 | { |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2137 | return ((test_type == 0xFF) || |
| 2138 | (type == test_type && code >= min_code && code <= max_code)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2139 | ^ invert; |
| 2140 | } |
| 2141 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2142 | static bool |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2143 | icmp_match(const struct sk_buff *skb, const struct xt_match_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | { |
Jan Engelhardt | 5452e42 | 2008-04-14 11:15:35 +0200 | [diff] [blame] | 2145 | const struct icmphdr *ic; |
| 2146 | struct icmphdr _icmph; |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2147 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2148 | |
| 2149 | /* Must not be a fragment. */ |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2150 | if (par->fragoff != 0) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2151 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2153 | ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | if (ic == NULL) { |
| 2155 | /* We've been asked to examine this packet, and we |
| 2156 | * can't. Hence, no choice but to drop. |
| 2157 | */ |
| 2158 | duprintf("Dropping evil ICMP tinygram.\n"); |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2159 | *par->hotdrop = true; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 2160 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | } |
| 2162 | |
| 2163 | return icmp_type_code_match(icmpinfo->type, |
| 2164 | icmpinfo->code[0], |
| 2165 | icmpinfo->code[1], |
| 2166 | ic->type, ic->code, |
| 2167 | !!(icmpinfo->invflags&IPT_ICMP_INV)); |
| 2168 | } |
| 2169 | |
Jan Engelhardt | b0f3845 | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 2170 | static int icmp_checkentry(const struct xt_mtchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 2172 | const struct ipt_icmp *icmpinfo = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2173 | |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2174 | /* Must specify no unknown invflags */ |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 2175 | return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | } |
| 2177 | |
| 2178 | /* The built-in targets: standard (NULL) and error. */ |
Patrick McHardy | 9f15c53 | 2007-07-07 22:22:02 -0700 | [diff] [blame] | 2179 | static struct xt_target ipt_standard_target __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2180 | .name = IPT_STANDARD_TARGET, |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2181 | .targetsize = sizeof(int), |
Jan Engelhardt | 4ba351c | 2009-04-14 14:28:48 +0200 | [diff] [blame] | 2182 | .family = NFPROTO_IPV4, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2183 | #ifdef CONFIG_COMPAT |
Patrick McHardy | 9fa492c | 2006-09-20 12:05:37 -0700 | [diff] [blame] | 2184 | .compatsize = sizeof(compat_int_t), |
| 2185 | .compat_from_user = compat_standard_from_user, |
| 2186 | .compat_to_user = compat_standard_to_user, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2187 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2188 | }; |
| 2189 | |
Patrick McHardy | 9f15c53 | 2007-07-07 22:22:02 -0700 | [diff] [blame] | 2190 | static struct xt_target ipt_error_target __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | .name = IPT_ERROR_TARGET, |
| 2192 | .target = ipt_error, |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2193 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
Jan Engelhardt | 4ba351c | 2009-04-14 14:28:48 +0200 | [diff] [blame] | 2194 | .family = NFPROTO_IPV4, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | }; |
| 2196 | |
| 2197 | static struct nf_sockopt_ops ipt_sockopts = { |
| 2198 | .pf = PF_INET, |
| 2199 | .set_optmin = IPT_BASE_CTL, |
| 2200 | .set_optmax = IPT_SO_SET_MAX+1, |
| 2201 | .set = do_ipt_set_ctl, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2202 | #ifdef CONFIG_COMPAT |
| 2203 | .compat_set = compat_do_ipt_set_ctl, |
| 2204 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | .get_optmin = IPT_BASE_CTL, |
| 2206 | .get_optmax = IPT_SO_GET_MAX+1, |
| 2207 | .get = do_ipt_get_ctl, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2208 | #ifdef CONFIG_COMPAT |
| 2209 | .compat_get = compat_do_ipt_get_ctl, |
| 2210 | #endif |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 2211 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2212 | }; |
| 2213 | |
Patrick McHardy | 9f15c53 | 2007-07-07 22:22:02 -0700 | [diff] [blame] | 2214 | static struct xt_match icmp_matchstruct __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2215 | .name = "icmp", |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2216 | .match = icmp_match, |
| 2217 | .matchsize = sizeof(struct ipt_icmp), |
Patrick McHardy | 9c54795 | 2007-12-17 21:52:00 -0800 | [diff] [blame] | 2218 | .checkentry = icmp_checkentry, |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2219 | .proto = IPPROTO_ICMP, |
Jan Engelhardt | 4ba351c | 2009-04-14 14:28:48 +0200 | [diff] [blame] | 2220 | .family = NFPROTO_IPV4, |
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 ip_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_IPV4); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2226 | } |
| 2227 | |
| 2228 | static void __net_exit ip_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_IPV4); |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2231 | } |
| 2232 | |
| 2233 | static struct pernet_operations ip_tables_net_ops = { |
| 2234 | .init = ip_tables_net_init, |
| 2235 | .exit = ip_tables_net_exit, |
| 2236 | }; |
| 2237 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2238 | static int __init ip_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(&ip_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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | /* Noone else will be downing sem now, so we won't sleep */ |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2247 | ret = xt_register_target(&ipt_standard_target); |
| 2248 | if (ret < 0) |
| 2249 | goto err2; |
| 2250 | ret = xt_register_target(&ipt_error_target); |
| 2251 | if (ret < 0) |
| 2252 | goto err3; |
| 2253 | ret = xt_register_match(&icmp_matchstruct); |
| 2254 | if (ret < 0) |
| 2255 | goto err4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | |
| 2257 | /* Register setsockopt */ |
| 2258 | ret = nf_register_sockopt(&ipt_sockopts); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2259 | if (ret < 0) |
| 2260 | goto err5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 2262 | pr_info("(C) 2000-2006 Netfilter Core Team\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | return 0; |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2264 | |
| 2265 | err5: |
| 2266 | xt_unregister_match(&icmp_matchstruct); |
| 2267 | err4: |
| 2268 | xt_unregister_target(&ipt_error_target); |
| 2269 | err3: |
| 2270 | xt_unregister_target(&ipt_standard_target); |
| 2271 | err2: |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2272 | unregister_pernet_subsys(&ip_tables_net_ops); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 2273 | err1: |
| 2274 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2275 | } |
| 2276 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2277 | static void __exit ip_tables_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | { |
| 2279 | nf_unregister_sockopt(&ipt_sockopts); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2280 | |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 2281 | xt_unregister_match(&icmp_matchstruct); |
| 2282 | xt_unregister_target(&ipt_error_target); |
| 2283 | xt_unregister_target(&ipt_standard_target); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2284 | |
Alexey Dobriyan | 3cb609d | 2008-01-31 04:49:35 -0800 | [diff] [blame] | 2285 | unregister_pernet_subsys(&ip_tables_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | } |
| 2287 | |
| 2288 | EXPORT_SYMBOL(ipt_register_table); |
| 2289 | EXPORT_SYMBOL(ipt_unregister_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | EXPORT_SYMBOL(ipt_do_table); |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2291 | module_init(ip_tables_init); |
| 2292 | module_exit(ip_tables_fini); |