Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Packet matching code. |
| 3 | * |
| 4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 11 | |
| 12 | #include <linux/capability.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 13 | #include <linux/in.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/kmod.h> |
| 16 | #include <linux/vmalloc.h> |
| 17 | #include <linux/netdevice.h> |
| 18 | #include <linux/module.h> |
Randy Dunlap | 4bdbf6c | 2006-07-03 19:47:27 -0700 | [diff] [blame] | 19 | #include <linux/poison.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/icmpv6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <net/ipv6.h> |
| 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> |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 25 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | #include <linux/netfilter_ipv6/ip6_tables.h> |
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 | |
| 30 | MODULE_LICENSE("GPL"); |
| 31 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 32 | MODULE_DESCRIPTION("IPv6 packet filter"); |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | /*#define DEBUG_IP_FIREWALL*/ |
| 35 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ |
| 36 | /*#define DEBUG_IP_FIREWALL_USER*/ |
| 37 | |
| 38 | #ifdef DEBUG_IP_FIREWALL |
| 39 | #define dprintf(format, args...) printk(format , ## args) |
| 40 | #else |
| 41 | #define dprintf(format, args...) |
| 42 | #endif |
| 43 | |
| 44 | #ifdef DEBUG_IP_FIREWALL_USER |
| 45 | #define duprintf(format, args...) printk(format , ## args) |
| 46 | #else |
| 47 | #define duprintf(format, args...) |
| 48 | #endif |
| 49 | |
| 50 | #ifdef CONFIG_NETFILTER_DEBUG |
| 51 | #define IP_NF_ASSERT(x) \ |
| 52 | do { \ |
| 53 | if (!(x)) \ |
| 54 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ |
| 55 | __FUNCTION__, __FILE__, __LINE__); \ |
| 56 | } while(0) |
| 57 | #else |
| 58 | #define IP_NF_ASSERT(x) |
| 59 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #if 0 |
| 62 | /* All the better to debug you with... */ |
| 63 | #define static |
| 64 | #define inline |
| 65 | #endif |
| 66 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 67 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | We keep a set of rules for each CPU, so we can avoid write-locking |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 69 | them in the softirq when updating the counters and therefore |
| 70 | only need to read-lock in the softirq; doing a write_lock_bh() in user |
| 71 | context stops packets coming through and allows user context to read |
| 72 | the counters or update the rules. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | Hence the start of any table is given by get_table() below. */ |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | /* Check for an extension */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 77 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | ip6t_ext_hdr(u8 nexthdr) |
| 79 | { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 80 | return ( (nexthdr == IPPROTO_HOPOPTS) || |
| 81 | (nexthdr == IPPROTO_ROUTING) || |
| 82 | (nexthdr == IPPROTO_FRAGMENT) || |
| 83 | (nexthdr == IPPROTO_ESP) || |
| 84 | (nexthdr == IPPROTO_AH) || |
| 85 | (nexthdr == IPPROTO_NONE) || |
| 86 | (nexthdr == IPPROTO_DSTOPTS) ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | /* Returns whether matches rule or not. */ |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 90 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | ip6_packet_match(const struct sk_buff *skb, |
| 92 | const char *indev, |
| 93 | const char *outdev, |
| 94 | const struct ip6t_ip6 *ip6info, |
| 95 | unsigned int *protoff, |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 96 | int *fragoff, bool *hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | { |
| 98 | size_t i; |
| 99 | unsigned long ret; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 100 | const struct ipv6hdr *ipv6 = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
| 102 | #define FWINV(bool,invflg) ((bool) ^ !!(ip6info->invflags & invflg)) |
| 103 | |
Patrick McHardy | f2ffd9e | 2006-03-20 18:03:16 -0800 | [diff] [blame] | 104 | if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 105 | &ip6info->src), IP6T_INV_SRCIP) |
Patrick McHardy | f2ffd9e | 2006-03-20 18:03:16 -0800 | [diff] [blame] | 106 | || FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 107 | &ip6info->dst), IP6T_INV_DSTIP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | dprintf("Source or dest mismatch.\n"); |
| 109 | /* |
| 110 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, |
| 111 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, |
| 112 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); |
| 113 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, |
| 114 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, |
| 115 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 116 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | /* Look for ifname matches; this should unroll nicely. */ |
| 120 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { |
| 121 | ret |= (((const unsigned long *)indev)[i] |
| 122 | ^ ((const unsigned long *)ip6info->iniface)[i]) |
| 123 | & ((const unsigned long *)ip6info->iniface_mask)[i]; |
| 124 | } |
| 125 | |
| 126 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { |
| 127 | dprintf("VIA in mismatch (%s vs %s).%s\n", |
| 128 | indev, ip6info->iniface, |
| 129 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 130 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { |
| 134 | ret |= (((const unsigned long *)outdev)[i] |
| 135 | ^ ((const unsigned long *)ip6info->outiface)[i]) |
| 136 | & ((const unsigned long *)ip6info->outiface_mask)[i]; |
| 137 | } |
| 138 | |
| 139 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { |
| 140 | dprintf("VIA out mismatch (%s vs %s).%s\n", |
| 141 | outdev, ip6info->outiface, |
| 142 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 143 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | /* ... might want to do something with class and flowlabel here ... */ |
| 147 | |
| 148 | /* look for the desired protocol header */ |
| 149 | if((ip6info->flags & IP6T_F_PROTO)) { |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 150 | int protohdr; |
| 151 | unsigned short _frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 153 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
Patrick McHardy | 51d8b1a | 2006-10-24 16:14:04 -0700 | [diff] [blame] | 154 | if (protohdr < 0) { |
| 155 | if (_frag_off == 0) |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 156 | *hotdrop = true; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 157 | return false; |
Patrick McHardy | 51d8b1a | 2006-10-24 16:14:04 -0700 | [diff] [blame] | 158 | } |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 159 | *fragoff = _frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
| 161 | dprintf("Packet protocol %hi ?= %s%hi.\n", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 162 | protohdr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
| 164 | ip6info->proto); |
| 165 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 166 | if (ip6info->proto == protohdr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | if(ip6info->invflags & IP6T_INV_PROTO) { |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 168 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | } |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 170 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | /* We need match for the '-p all', too! */ |
| 174 | if ((ip6info->proto != 0) && |
| 175 | !(ip6info->invflags & IP6T_INV_PROTO)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 176 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 178 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | /* should be ip6 safe */ |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 182 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
| 184 | { |
| 185 | if (ipv6->flags & ~IP6T_F_MASK) { |
| 186 | duprintf("Unknown flag bits set: %08X\n", |
| 187 | ipv6->flags & ~IP6T_F_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 188 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | if (ipv6->invflags & ~IP6T_INV_MASK) { |
| 191 | duprintf("Unknown invflag bits set: %08X\n", |
| 192 | ipv6->invflags & ~IP6T_INV_MASK); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 193 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 195 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | static unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 199 | ip6t_error(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | const struct net_device *in, |
| 201 | const struct net_device *out, |
| 202 | unsigned int hooknum, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame] | 203 | const struct xt_target *target, |
Patrick McHardy | fe1cb10 | 2006-08-22 00:35:47 -0700 | [diff] [blame] | 204 | const void *targinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | { |
| 206 | if (net_ratelimit()) |
| 207 | printk("ip6_tables: error: `%s'\n", (char *)targinfo); |
| 208 | |
| 209 | return NF_DROP; |
| 210 | } |
| 211 | |
| 212 | static inline |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 213 | bool do_match(struct ip6t_entry_match *m, |
| 214 | const struct sk_buff *skb, |
| 215 | const struct net_device *in, |
| 216 | const struct net_device *out, |
| 217 | int offset, |
| 218 | unsigned int protoff, |
| 219 | bool *hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | { |
| 221 | /* Stop iteration if it doesn't match */ |
Patrick McHardy | 1c52483 | 2006-03-20 18:02:15 -0800 | [diff] [blame] | 222 | if (!m->u.kernel.match->match(skb, in, out, m->u.kernel.match, m->data, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | offset, protoff, hotdrop)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 224 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | else |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 226 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | static inline struct ip6t_entry * |
| 230 | get_entry(void *base, unsigned int offset) |
| 231 | { |
| 232 | return (struct ip6t_entry *)(base + offset); |
| 233 | } |
| 234 | |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 235 | /* All zeroes == unconditional rule. */ |
| 236 | static inline int |
| 237 | unconditional(const struct ip6t_ip6 *ipv6) |
| 238 | { |
| 239 | unsigned int i; |
| 240 | |
| 241 | for (i = 0; i < sizeof(*ipv6); i++) |
| 242 | if (((char *)ipv6)[i]) |
| 243 | break; |
| 244 | |
| 245 | return (i == sizeof(*ipv6)); |
| 246 | } |
| 247 | |
| 248 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
| 249 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) |
| 250 | /* This cries for unification! */ |
| 251 | static const char *hooknames[] = { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 252 | [NF_INET_PRE_ROUTING] = "PREROUTING", |
| 253 | [NF_INET_LOCAL_IN] = "INPUT", |
| 254 | [NF_INET_FORWARD] = "FORWARD", |
| 255 | [NF_INET_LOCAL_OUT] = "OUTPUT", |
| 256 | [NF_INET_POST_ROUTING] = "POSTROUTING", |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 257 | }; |
| 258 | |
| 259 | enum nf_ip_trace_comments { |
| 260 | NF_IP6_TRACE_COMMENT_RULE, |
| 261 | NF_IP6_TRACE_COMMENT_RETURN, |
| 262 | NF_IP6_TRACE_COMMENT_POLICY, |
| 263 | }; |
| 264 | |
| 265 | static const char *comments[] = { |
| 266 | [NF_IP6_TRACE_COMMENT_RULE] = "rule", |
| 267 | [NF_IP6_TRACE_COMMENT_RETURN] = "return", |
| 268 | [NF_IP6_TRACE_COMMENT_POLICY] = "policy", |
| 269 | }; |
| 270 | |
| 271 | static struct nf_loginfo trace_loginfo = { |
| 272 | .type = NF_LOG_TYPE_LOG, |
| 273 | .u = { |
| 274 | .log = { |
| 275 | .level = 4, |
| 276 | .logflags = NF_LOG_MASK, |
| 277 | }, |
| 278 | }, |
| 279 | }; |
| 280 | |
| 281 | static inline int |
| 282 | get_chainname_rulenum(struct ip6t_entry *s, struct ip6t_entry *e, |
| 283 | char *hookname, char **chainname, |
| 284 | char **comment, unsigned int *rulenum) |
| 285 | { |
| 286 | struct ip6t_standard_target *t = (void *)ip6t_get_target(s); |
| 287 | |
| 288 | if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) { |
| 289 | /* Head of user chain: ERROR target with chainname */ |
| 290 | *chainname = t->target.data; |
| 291 | (*rulenum) = 0; |
| 292 | } else if (s == e) { |
| 293 | (*rulenum)++; |
| 294 | |
| 295 | if (s->target_offset == sizeof(struct ip6t_entry) |
| 296 | && strcmp(t->target.u.kernel.target->name, |
| 297 | IP6T_STANDARD_TARGET) == 0 |
| 298 | && t->verdict < 0 |
| 299 | && unconditional(&s->ipv6)) { |
| 300 | /* Tail of chains: STANDARD target (return/policy) */ |
| 301 | *comment = *chainname == hookname |
| 302 | ? (char *)comments[NF_IP6_TRACE_COMMENT_POLICY] |
| 303 | : (char *)comments[NF_IP6_TRACE_COMMENT_RETURN]; |
| 304 | } |
| 305 | return 1; |
| 306 | } else |
| 307 | (*rulenum)++; |
| 308 | |
| 309 | return 0; |
| 310 | } |
| 311 | |
| 312 | static void trace_packet(struct sk_buff *skb, |
| 313 | unsigned int hook, |
| 314 | const struct net_device *in, |
| 315 | const struct net_device *out, |
| 316 | char *tablename, |
| 317 | struct xt_table_info *private, |
| 318 | struct ip6t_entry *e) |
| 319 | { |
| 320 | void *table_base; |
| 321 | struct ip6t_entry *root; |
| 322 | char *hookname, *chainname, *comment; |
| 323 | unsigned int rulenum = 0; |
| 324 | |
| 325 | table_base = (void *)private->entries[smp_processor_id()]; |
| 326 | root = get_entry(table_base, private->hook_entry[hook]); |
| 327 | |
| 328 | hookname = chainname = (char *)hooknames[hook]; |
| 329 | comment = (char *)comments[NF_IP6_TRACE_COMMENT_RULE]; |
| 330 | |
| 331 | IP6T_ENTRY_ITERATE(root, |
| 332 | private->size - private->hook_entry[hook], |
| 333 | get_chainname_rulenum, |
| 334 | e, hookname, &chainname, &comment, &rulenum); |
| 335 | |
| 336 | nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo, |
| 337 | "TRACE: %s:%s:%s:%u ", |
| 338 | tablename, chainname, comment, rulenum); |
| 339 | } |
| 340 | #endif |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
| 343 | unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 344 | ip6t_do_table(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | unsigned int hook, |
| 346 | const struct net_device *in, |
| 347 | const struct net_device *out, |
Patrick McHardy | fe1cb10 | 2006-08-22 00:35:47 -0700 | [diff] [blame] | 348 | struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | { |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 350 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | int offset = 0; |
| 352 | unsigned int protoff = 0; |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 353 | bool hotdrop = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
| 355 | unsigned int verdict = NF_DROP; |
| 356 | const char *indev, *outdev; |
| 357 | void *table_base; |
| 358 | struct ip6t_entry *e, *back; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 359 | struct xt_table_info *private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
| 361 | /* Initialization */ |
| 362 | indev = in ? in->name : nulldevname; |
| 363 | outdev = out ? out->name : nulldevname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | /* We handle fragments by dealing with the first fragment as |
| 365 | * if it was a normal packet. All other fragments are treated |
| 366 | * normally, except that they will NEVER match rules that ask |
| 367 | * things we don't know, ie. tcp syn flag or ports). If the |
| 368 | * rule is also a fragment-specific rule, non-fragments won't |
| 369 | * match it. */ |
| 370 | |
| 371 | read_lock_bh(&table->lock); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 372 | private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 374 | table_base = (void *)private->entries[smp_processor_id()]; |
| 375 | e = get_entry(table_base, private->hook_entry[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | /* For return from builtin chain */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 378 | back = get_entry(table_base, private->underflow[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
| 380 | do { |
| 381 | IP_NF_ASSERT(e); |
| 382 | IP_NF_ASSERT(back); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 383 | if (ip6_packet_match(skb, indev, outdev, &e->ipv6, |
Patrick McHardy | 51d8b1a | 2006-10-24 16:14:04 -0700 | [diff] [blame] | 384 | &protoff, &offset, &hotdrop)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | struct ip6t_entry_target *t; |
| 386 | |
| 387 | if (IP6T_MATCH_ITERATE(e, do_match, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 388 | skb, in, out, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | offset, protoff, &hotdrop) != 0) |
| 390 | goto no_match; |
| 391 | |
| 392 | ADD_COUNTER(e->counters, |
Patrick McHardy | 72f36ec | 2007-12-17 21:48:02 -0800 | [diff] [blame] | 393 | ntohs(ipv6_hdr(skb)->payload_len) + |
| 394 | sizeof(struct ipv6hdr), 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
| 396 | t = ip6t_get_target(e); |
| 397 | IP_NF_ASSERT(t->u.kernel.target); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 398 | |
| 399 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
| 400 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) |
| 401 | /* The packet is traced: log it */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 402 | if (unlikely(skb->nf_trace)) |
| 403 | trace_packet(skb, hook, in, out, |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 404 | table->name, private, e); |
| 405 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | /* Standard target? */ |
| 407 | if (!t->u.kernel.target->target) { |
| 408 | int v; |
| 409 | |
| 410 | v = ((struct ip6t_standard_target *)t)->verdict; |
| 411 | if (v < 0) { |
| 412 | /* Pop from stack? */ |
| 413 | if (v != IP6T_RETURN) { |
| 414 | verdict = (unsigned)(-v) - 1; |
| 415 | break; |
| 416 | } |
| 417 | e = back; |
| 418 | back = get_entry(table_base, |
| 419 | back->comefrom); |
| 420 | continue; |
| 421 | } |
Patrick McHardy | 0546534 | 2005-08-21 23:31:43 -0700 | [diff] [blame] | 422 | if (table_base + v != (void *)e + e->next_offset |
| 423 | && !(e->ipv6.flags & IP6T_F_GOTO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | /* Save old back ptr in next entry */ |
| 425 | struct ip6t_entry *next |
| 426 | = (void *)e + e->next_offset; |
| 427 | next->comefrom |
| 428 | = (void *)back - table_base; |
| 429 | /* set back pointer to next entry */ |
| 430 | back = next; |
| 431 | } |
| 432 | |
| 433 | e = get_entry(table_base, v); |
| 434 | } else { |
| 435 | /* Targets which reenter must return |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 436 | abs. verdicts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | #ifdef CONFIG_NETFILTER_DEBUG |
| 438 | ((struct ip6t_entry *)table_base)->comefrom |
| 439 | = 0xeeeeeeec; |
| 440 | #endif |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 441 | verdict = t->u.kernel.target->target(skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | in, out, |
| 443 | hook, |
Patrick McHardy | 1c52483 | 2006-03-20 18:02:15 -0800 | [diff] [blame] | 444 | t->u.kernel.target, |
Patrick McHardy | fe1cb10 | 2006-08-22 00:35:47 -0700 | [diff] [blame] | 445 | t->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | #ifdef CONFIG_NETFILTER_DEBUG |
| 448 | if (((struct ip6t_entry *)table_base)->comefrom |
| 449 | != 0xeeeeeeec |
| 450 | && verdict == IP6T_CONTINUE) { |
| 451 | printk("Target %s reentered!\n", |
| 452 | t->u.kernel.target->name); |
| 453 | verdict = NF_DROP; |
| 454 | } |
| 455 | ((struct ip6t_entry *)table_base)->comefrom |
| 456 | = 0x57acc001; |
| 457 | #endif |
| 458 | if (verdict == IP6T_CONTINUE) |
| 459 | e = (void *)e + e->next_offset; |
| 460 | else |
| 461 | /* Verdict */ |
| 462 | break; |
| 463 | } |
| 464 | } else { |
| 465 | |
| 466 | no_match: |
| 467 | e = (void *)e + e->next_offset; |
| 468 | } |
| 469 | } while (!hotdrop); |
| 470 | |
| 471 | #ifdef CONFIG_NETFILTER_DEBUG |
Randy Dunlap | 4bdbf6c | 2006-07-03 19:47:27 -0700 | [diff] [blame] | 472 | ((struct ip6t_entry *)table_base)->comefrom = NETFILTER_LINK_POISON; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | #endif |
| 474 | read_unlock_bh(&table->lock); |
| 475 | |
| 476 | #ifdef DEBUG_ALLOW_ALL |
| 477 | return NF_ACCEPT; |
| 478 | #else |
| 479 | if (hotdrop) |
| 480 | return NF_DROP; |
| 481 | else return verdict; |
| 482 | #endif |
| 483 | } |
| 484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | /* Figures out from what hook each rule can be called: returns 0 if |
| 486 | there are loops. Puts hook bitmask in comefrom. */ |
| 487 | static int |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 488 | mark_source_chains(struct xt_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 489 | unsigned int valid_hooks, void *entry0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | { |
| 491 | unsigned int hook; |
| 492 | |
| 493 | /* No recursion; use packet counter to save back ptrs (reset |
| 494 | to 0 as we leave), and comefrom to save source hook bitmask */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 495 | for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | unsigned int pos = newinfo->hook_entry[hook]; |
| 497 | struct ip6t_entry *e |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 498 | = (struct ip6t_entry *)(entry0 + pos); |
Al Viro | e1b4b9f | 2006-12-12 00:29:52 -0800 | [diff] [blame] | 499 | int visited = e->comefrom & (1 << hook); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
| 501 | if (!(valid_hooks & (1 << hook))) |
| 502 | continue; |
| 503 | |
| 504 | /* Set initial back pointer. */ |
| 505 | e->counters.pcnt = pos; |
| 506 | |
| 507 | for (;;) { |
| 508 | struct ip6t_standard_target *t |
| 509 | = (void *)ip6t_get_target(e); |
| 510 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 511 | if (e->comefrom & (1 << NF_INET_NUMHOOKS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | printk("iptables: loop hook %u pos %u %08X.\n", |
| 513 | hook, pos, e->comefrom); |
| 514 | return 0; |
| 515 | } |
| 516 | e->comefrom |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 517 | |= ((1 << hook) | (1 << NF_INET_NUMHOOKS)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
| 519 | /* Unconditional return/END. */ |
Al Viro | e1b4b9f | 2006-12-12 00:29:52 -0800 | [diff] [blame] | 520 | if ((e->target_offset == sizeof(struct ip6t_entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | && (strcmp(t->target.u.user.name, |
| 522 | IP6T_STANDARD_TARGET) == 0) |
| 523 | && t->verdict < 0 |
Al Viro | e1b4b9f | 2006-12-12 00:29:52 -0800 | [diff] [blame] | 524 | && unconditional(&e->ipv6)) || visited) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | unsigned int oldpos, size; |
| 526 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 527 | if (t->verdict < -NF_MAX_VERDICT - 1) { |
| 528 | duprintf("mark_source_chains: bad " |
| 529 | "negative verdict (%i)\n", |
| 530 | t->verdict); |
| 531 | return 0; |
| 532 | } |
| 533 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | /* Return: backtrack through the last |
| 535 | big jump. */ |
| 536 | do { |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 537 | e->comefrom ^= (1<<NF_INET_NUMHOOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | #ifdef DEBUG_IP_FIREWALL_USER |
| 539 | if (e->comefrom |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 540 | & (1 << NF_INET_NUMHOOKS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | duprintf("Back unset " |
| 542 | "on hook %u " |
| 543 | "rule %u\n", |
| 544 | hook, pos); |
| 545 | } |
| 546 | #endif |
| 547 | oldpos = pos; |
| 548 | pos = e->counters.pcnt; |
| 549 | e->counters.pcnt = 0; |
| 550 | |
| 551 | /* We're at the start. */ |
| 552 | if (pos == oldpos) |
| 553 | goto next; |
| 554 | |
| 555 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 556 | (entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } while (oldpos == pos + e->next_offset); |
| 558 | |
| 559 | /* Move along one */ |
| 560 | size = e->next_offset; |
| 561 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 562 | (entry0 + pos + size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | e->counters.pcnt = pos; |
| 564 | pos += size; |
| 565 | } else { |
| 566 | int newpos = t->verdict; |
| 567 | |
| 568 | if (strcmp(t->target.u.user.name, |
| 569 | IP6T_STANDARD_TARGET) == 0 |
| 570 | && newpos >= 0) { |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 571 | if (newpos > newinfo->size - |
| 572 | sizeof(struct ip6t_entry)) { |
| 573 | duprintf("mark_source_chains: " |
| 574 | "bad verdict (%i)\n", |
| 575 | newpos); |
| 576 | return 0; |
| 577 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | /* This a jump; chase it. */ |
| 579 | duprintf("Jump rule %u -> %u\n", |
| 580 | pos, newpos); |
| 581 | } else { |
| 582 | /* ... this is a fallthru */ |
| 583 | newpos = pos + e->next_offset; |
| 584 | } |
| 585 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 586 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | e->counters.pcnt = pos; |
| 588 | pos = newpos; |
| 589 | } |
| 590 | } |
| 591 | next: |
| 592 | duprintf("Finished chain %u\n", hook); |
| 593 | } |
| 594 | return 1; |
| 595 | } |
| 596 | |
| 597 | static inline int |
| 598 | cleanup_match(struct ip6t_entry_match *m, unsigned int *i) |
| 599 | { |
| 600 | if (i && (*i)-- == 0) |
| 601 | return 1; |
| 602 | |
| 603 | if (m->u.kernel.match->destroy) |
Patrick McHardy | efa7416 | 2006-08-22 00:36:37 -0700 | [diff] [blame] | 604 | m->u.kernel.match->destroy(m->u.kernel.match, m->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | module_put(m->u.kernel.match->me); |
| 606 | return 0; |
| 607 | } |
| 608 | |
| 609 | static inline int |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 610 | check_entry(struct ip6t_entry *e, const char *name) |
| 611 | { |
| 612 | struct ip6t_entry_target *t; |
| 613 | |
| 614 | if (!ip6_checkentry(&e->ipv6)) { |
| 615 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); |
| 616 | return -EINVAL; |
| 617 | } |
| 618 | |
| 619 | if (e->target_offset + sizeof(struct ip6t_entry_target) > |
| 620 | e->next_offset) |
| 621 | return -EINVAL; |
| 622 | |
| 623 | t = ip6t_get_target(e); |
| 624 | if (e->target_offset + t->u.target_size > e->next_offset) |
| 625 | return -EINVAL; |
| 626 | |
| 627 | return 0; |
| 628 | } |
| 629 | |
| 630 | static inline int check_match(struct ip6t_entry_match *m, const char *name, |
| 631 | const struct ip6t_ip6 *ipv6, |
| 632 | unsigned int hookmask, unsigned int *i) |
| 633 | { |
| 634 | struct xt_match *match; |
| 635 | int ret; |
| 636 | |
| 637 | match = m->u.kernel.match; |
| 638 | ret = xt_check_match(match, AF_INET6, m->u.match_size - sizeof(*m), |
| 639 | name, hookmask, ipv6->proto, |
| 640 | ipv6->invflags & IP6T_INV_PROTO); |
| 641 | if (!ret && m->u.kernel.match->checkentry |
| 642 | && !m->u.kernel.match->checkentry(name, ipv6, match, m->data, |
| 643 | hookmask)) { |
| 644 | duprintf("ip_tables: check failed for `%s'.\n", |
| 645 | m->u.kernel.match->name); |
| 646 | ret = -EINVAL; |
| 647 | } |
| 648 | if (!ret) |
| 649 | (*i)++; |
| 650 | return ret; |
| 651 | } |
| 652 | |
| 653 | static inline int |
| 654 | find_check_match(struct ip6t_entry_match *m, |
| 655 | const char *name, |
| 656 | const struct ip6t_ip6 *ipv6, |
| 657 | unsigned int hookmask, |
| 658 | unsigned int *i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | { |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 660 | struct xt_match *match; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 661 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 663 | match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 664 | m->u.user.revision), |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 665 | "ip6t_%s", m->u.user.name); |
| 666 | if (IS_ERR(match) || !match) { |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 667 | duprintf("find_check_match: `%s' not found\n", m->u.user.name); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 668 | return match ? PTR_ERR(match) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | } |
| 670 | m->u.kernel.match = match; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 672 | ret = check_match(m, name, ipv6, hookmask, i); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 673 | if (ret) |
| 674 | goto err; |
| 675 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 677 | err: |
| 678 | module_put(m->u.kernel.match->me); |
| 679 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 682 | static inline int check_target(struct ip6t_entry *e, const char *name) |
| 683 | { |
| 684 | struct ip6t_entry_target *t; |
| 685 | struct xt_target *target; |
| 686 | int ret; |
| 687 | |
| 688 | t = ip6t_get_target(e); |
| 689 | target = t->u.kernel.target; |
| 690 | ret = xt_check_target(target, AF_INET6, t->u.target_size - sizeof(*t), |
| 691 | name, e->comefrom, e->ipv6.proto, |
| 692 | e->ipv6.invflags & IP6T_INV_PROTO); |
| 693 | if (!ret && t->u.kernel.target->checkentry |
| 694 | && !t->u.kernel.target->checkentry(name, e, target, t->data, |
| 695 | e->comefrom)) { |
| 696 | duprintf("ip_tables: check failed for `%s'.\n", |
| 697 | t->u.kernel.target->name); |
| 698 | ret = -EINVAL; |
| 699 | } |
| 700 | return ret; |
| 701 | } |
| 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | static inline int |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 704 | find_check_entry(struct ip6t_entry *e, const char *name, unsigned int size, |
| 705 | unsigned int *i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | { |
| 707 | struct ip6t_entry_target *t; |
Jan Engelhardt | 6709dbb | 2007-02-07 15:11:19 -0800 | [diff] [blame] | 708 | struct xt_target *target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | int ret; |
| 710 | unsigned int j; |
| 711 | |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 712 | ret = check_entry(e, name); |
| 713 | if (ret) |
| 714 | return ret; |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | j = 0; |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 717 | ret = IP6T_MATCH_ITERATE(e, find_check_match, name, &e->ipv6, |
| 718 | e->comefrom, &j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | if (ret != 0) |
| 720 | goto cleanup_matches; |
| 721 | |
| 722 | t = ip6t_get_target(e); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 723 | target = try_then_request_module(xt_find_target(AF_INET6, |
| 724 | t->u.user.name, |
| 725 | t->u.user.revision), |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 726 | "ip6t_%s", t->u.user.name); |
| 727 | if (IS_ERR(target) || !target) { |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 728 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 729 | ret = target ? PTR_ERR(target) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | goto cleanup_matches; |
| 731 | } |
| 732 | t->u.kernel.target = target; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 733 | |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 734 | ret = check_target(e, name); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 735 | if (ret) |
| 736 | goto err; |
| 737 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | (*i)++; |
| 739 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 740 | err: |
| 741 | module_put(t->u.kernel.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | cleanup_matches: |
| 743 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); |
| 744 | return ret; |
| 745 | } |
| 746 | |
| 747 | static inline int |
| 748 | check_entry_size_and_hooks(struct ip6t_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 749 | struct xt_table_info *newinfo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | unsigned char *base, |
| 751 | unsigned char *limit, |
| 752 | const unsigned int *hook_entries, |
| 753 | const unsigned int *underflows, |
| 754 | unsigned int *i) |
| 755 | { |
| 756 | unsigned int h; |
| 757 | |
| 758 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 |
| 759 | || (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { |
| 760 | duprintf("Bad offset %p\n", e); |
| 761 | return -EINVAL; |
| 762 | } |
| 763 | |
| 764 | if (e->next_offset |
| 765 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { |
| 766 | duprintf("checking: element %p size %u\n", |
| 767 | e, e->next_offset); |
| 768 | return -EINVAL; |
| 769 | } |
| 770 | |
| 771 | /* Check hooks & underflows */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 772 | for (h = 0; h < NF_INET_NUMHOOKS; h++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | if ((unsigned char *)e - base == hook_entries[h]) |
| 774 | newinfo->hook_entry[h] = hook_entries[h]; |
| 775 | if ((unsigned char *)e - base == underflows[h]) |
| 776 | newinfo->underflow[h] = underflows[h]; |
| 777 | } |
| 778 | |
| 779 | /* FIXME: underflows must be unconditional, standard verdicts |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 780 | < 0 (not IP6T_RETURN). --RR */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
| 782 | /* Clear counters and comefrom */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 783 | e->counters = ((struct xt_counters) { 0, 0 }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | e->comefrom = 0; |
| 785 | |
| 786 | (*i)++; |
| 787 | return 0; |
| 788 | } |
| 789 | |
| 790 | static inline int |
| 791 | cleanup_entry(struct ip6t_entry *e, unsigned int *i) |
| 792 | { |
| 793 | struct ip6t_entry_target *t; |
| 794 | |
| 795 | if (i && (*i)-- == 0) |
| 796 | return 1; |
| 797 | |
| 798 | /* Cleanup all matches */ |
| 799 | IP6T_MATCH_ITERATE(e, cleanup_match, NULL); |
| 800 | t = ip6t_get_target(e); |
| 801 | if (t->u.kernel.target->destroy) |
Patrick McHardy | efa7416 | 2006-08-22 00:36:37 -0700 | [diff] [blame] | 802 | t->u.kernel.target->destroy(t->u.kernel.target, t->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | module_put(t->u.kernel.target->me); |
| 804 | return 0; |
| 805 | } |
| 806 | |
| 807 | /* Checks and translates the user-supplied table segment (held in |
| 808 | newinfo) */ |
| 809 | static int |
| 810 | translate_table(const char *name, |
| 811 | unsigned int valid_hooks, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 812 | struct xt_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 813 | void *entry0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | unsigned int size, |
| 815 | unsigned int number, |
| 816 | const unsigned int *hook_entries, |
| 817 | const unsigned int *underflows) |
| 818 | { |
| 819 | unsigned int i; |
| 820 | int ret; |
| 821 | |
| 822 | newinfo->size = size; |
| 823 | newinfo->number = number; |
| 824 | |
| 825 | /* Init all hooks to impossible value. */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 826 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
| 828 | newinfo->underflow[i] = 0xFFFFFFFF; |
| 829 | } |
| 830 | |
| 831 | duprintf("translate_table: size %u\n", newinfo->size); |
| 832 | i = 0; |
| 833 | /* Walk through entries, checking offsets. */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 834 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | check_entry_size_and_hooks, |
| 836 | newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 837 | entry0, |
| 838 | entry0 + size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | hook_entries, underflows, &i); |
| 840 | if (ret != 0) |
| 841 | return ret; |
| 842 | |
| 843 | if (i != number) { |
| 844 | duprintf("translate_table: %u not %u entries\n", |
| 845 | i, number); |
| 846 | return -EINVAL; |
| 847 | } |
| 848 | |
| 849 | /* Check hooks all assigned */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 850 | for (i = 0; i < NF_INET_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | /* Only hooks which are valid */ |
| 852 | if (!(valid_hooks & (1 << i))) |
| 853 | continue; |
| 854 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { |
| 855 | duprintf("Invalid hook entry %u %u\n", |
| 856 | i, hook_entries[i]); |
| 857 | return -EINVAL; |
| 858 | } |
| 859 | if (newinfo->underflow[i] == 0xFFFFFFFF) { |
| 860 | duprintf("Invalid underflow %u %u\n", |
| 861 | i, underflows[i]); |
| 862 | return -EINVAL; |
| 863 | } |
| 864 | } |
| 865 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 866 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
| 867 | return -ELOOP; |
| 868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | /* Finally, each sanity check must pass */ |
| 870 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 871 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
Patrick McHardy | f173c8a | 2007-12-17 21:48:17 -0800 | [diff] [blame] | 872 | find_check_entry, name, size, &i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
Dmitry Mishin | 74c9c0c | 2006-12-05 13:43:50 -0800 | [diff] [blame] | 874 | if (ret != 0) { |
| 875 | IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
| 876 | cleanup_entry, &i); |
| 877 | return ret; |
| 878 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
| 880 | /* And one copy for every other CPU */ |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 881 | for_each_possible_cpu(i) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 882 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
| 883 | memcpy(newinfo->entries[i], entry0, newinfo->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | } |
| 885 | |
Dmitry Mishin | 590bdf7 | 2006-10-30 15:12:55 -0800 | [diff] [blame] | 886 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | } |
| 888 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | /* Gets counters. */ |
| 890 | static inline int |
| 891 | add_entry_to_counter(const struct ip6t_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 892 | struct xt_counters total[], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | unsigned int *i) |
| 894 | { |
| 895 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); |
| 896 | |
| 897 | (*i)++; |
| 898 | return 0; |
| 899 | } |
| 900 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 901 | static inline int |
| 902 | set_entry_to_counter(const struct ip6t_entry *e, |
| 903 | struct ip6t_counters total[], |
| 904 | unsigned int *i) |
| 905 | { |
| 906 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); |
| 907 | |
| 908 | (*i)++; |
| 909 | return 0; |
| 910 | } |
| 911 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | static void |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 913 | get_counters(const struct xt_table_info *t, |
| 914 | struct xt_counters counters[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | { |
| 916 | unsigned int cpu; |
| 917 | unsigned int i; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 918 | unsigned int curcpu; |
| 919 | |
| 920 | /* Instead of clearing (by a previous call to memset()) |
| 921 | * the counters and using adds, we set the counters |
| 922 | * with data used by 'current' CPU |
| 923 | * We dont care about preemption here. |
| 924 | */ |
| 925 | curcpu = raw_smp_processor_id(); |
| 926 | |
| 927 | i = 0; |
| 928 | IP6T_ENTRY_ITERATE(t->entries[curcpu], |
| 929 | t->size, |
| 930 | set_entry_to_counter, |
| 931 | counters, |
| 932 | &i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 934 | for_each_possible_cpu(cpu) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 935 | if (cpu == curcpu) |
| 936 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 938 | IP6T_ENTRY_ITERATE(t->entries[cpu], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | t->size, |
| 940 | add_entry_to_counter, |
| 941 | counters, |
| 942 | &i); |
| 943 | } |
| 944 | } |
| 945 | |
| 946 | static int |
| 947 | copy_entries_to_user(unsigned int total_size, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 948 | struct xt_table *table, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | void __user *userptr) |
| 950 | { |
| 951 | unsigned int off, num, countersize; |
| 952 | struct ip6t_entry *e; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 953 | struct xt_counters *counters; |
| 954 | struct xt_table_info *private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | int ret = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 956 | void *loc_cpu_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | |
| 958 | /* We need atomic snapshot of counters: rest doesn't change |
| 959 | (other than comefrom, which userspace doesn't care |
| 960 | about). */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 961 | countersize = sizeof(struct xt_counters) * private->number; |
Patrick McHardy | 3b84e92 | 2007-12-17 21:48:33 -0800 | [diff] [blame^] | 962 | counters = vmalloc_node(countersize, numa_node_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
| 964 | if (counters == NULL) |
| 965 | return -ENOMEM; |
| 966 | |
| 967 | /* First, sum counters... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | write_lock_bh(&table->lock); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 969 | get_counters(private, counters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | write_unlock_bh(&table->lock); |
| 971 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 972 | /* choose the copy that is on ourc node/cpu */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 973 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 974 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | ret = -EFAULT; |
| 976 | goto free_counters; |
| 977 | } |
| 978 | |
| 979 | /* FIXME: use iterator macros --RR */ |
| 980 | /* ... then go back and fix counters and names */ |
| 981 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ |
| 982 | unsigned int i; |
| 983 | struct ip6t_entry_match *m; |
| 984 | struct ip6t_entry_target *t; |
| 985 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 986 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | if (copy_to_user(userptr + off |
| 988 | + offsetof(struct ip6t_entry, counters), |
| 989 | &counters[num], |
| 990 | sizeof(counters[num])) != 0) { |
| 991 | ret = -EFAULT; |
| 992 | goto free_counters; |
| 993 | } |
| 994 | |
| 995 | for (i = sizeof(struct ip6t_entry); |
| 996 | i < e->target_offset; |
| 997 | i += m->u.match_size) { |
| 998 | m = (void *)e + i; |
| 999 | |
| 1000 | if (copy_to_user(userptr + off + i |
| 1001 | + offsetof(struct ip6t_entry_match, |
| 1002 | u.user.name), |
| 1003 | m->u.kernel.match->name, |
| 1004 | strlen(m->u.kernel.match->name)+1) |
| 1005 | != 0) { |
| 1006 | ret = -EFAULT; |
| 1007 | goto free_counters; |
| 1008 | } |
| 1009 | } |
| 1010 | |
| 1011 | t = ip6t_get_target(e); |
| 1012 | if (copy_to_user(userptr + off + e->target_offset |
| 1013 | + offsetof(struct ip6t_entry_target, |
| 1014 | u.user.name), |
| 1015 | t->u.kernel.target->name, |
| 1016 | strlen(t->u.kernel.target->name)+1) != 0) { |
| 1017 | ret = -EFAULT; |
| 1018 | goto free_counters; |
| 1019 | } |
| 1020 | } |
| 1021 | |
| 1022 | free_counters: |
| 1023 | vfree(counters); |
| 1024 | return ret; |
| 1025 | } |
| 1026 | |
| 1027 | static int |
| 1028 | get_entries(const struct ip6t_get_entries *entries, |
| 1029 | struct ip6t_get_entries __user *uptr) |
| 1030 | { |
| 1031 | int ret; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1032 | struct xt_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1034 | t = xt_find_table_lock(AF_INET6, entries->name); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1035 | if (t && !IS_ERR(t)) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1036 | struct xt_table_info *private = t->private; |
| 1037 | duprintf("t->private->number = %u\n", private->number); |
| 1038 | if (entries->size == private->size) |
| 1039 | ret = copy_entries_to_user(private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | t, uptr->entrytable); |
| 1041 | else { |
| 1042 | duprintf("get_entries: I've got %u not %u!\n", |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1043 | private->size, entries->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | ret = -EINVAL; |
| 1045 | } |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1046 | module_put(t->me); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1047 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | } else |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1049 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | |
| 1051 | return ret; |
| 1052 | } |
| 1053 | |
| 1054 | static int |
| 1055 | do_replace(void __user *user, unsigned int len) |
| 1056 | { |
| 1057 | int ret; |
| 1058 | struct ip6t_replace tmp; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1059 | struct xt_table *t; |
| 1060 | struct xt_table_info *newinfo, *oldinfo; |
| 1061 | struct xt_counters *counters; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1062 | void *loc_cpu_entry, *loc_cpu_old_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | |
| 1064 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1065 | return -EFAULT; |
| 1066 | |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1067 | /* overflow check */ |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1068 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1069 | return -ENOMEM; |
| 1070 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1071 | newinfo = xt_alloc_table_info(tmp.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | if (!newinfo) |
| 1073 | return -ENOMEM; |
| 1074 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1075 | /* choose the copy that is on our node/cpu */ |
| 1076 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 1077 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | tmp.size) != 0) { |
| 1079 | ret = -EFAULT; |
| 1080 | goto free_newinfo; |
| 1081 | } |
| 1082 | |
Patrick McHardy | 3b84e92 | 2007-12-17 21:48:33 -0800 | [diff] [blame^] | 1083 | counters = vmalloc_node(tmp.num_counters * sizeof(struct xt_counters), |
| 1084 | numa_node_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | if (!counters) { |
| 1086 | ret = -ENOMEM; |
| 1087 | goto free_newinfo; |
| 1088 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | |
| 1090 | ret = translate_table(tmp.name, tmp.valid_hooks, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1091 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | tmp.hook_entry, tmp.underflow); |
| 1093 | if (ret != 0) |
| 1094 | goto free_newinfo_counters; |
| 1095 | |
| 1096 | duprintf("ip_tables: Translated table\n"); |
| 1097 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1098 | t = try_then_request_module(xt_find_table_lock(AF_INET6, tmp.name), |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1099 | "ip6table_%s", tmp.name); |
| 1100 | if (!t || IS_ERR(t)) { |
| 1101 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | goto free_newinfo_counters_untrans; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1103 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | |
| 1105 | /* You lied! */ |
| 1106 | if (tmp.valid_hooks != t->valid_hooks) { |
| 1107 | duprintf("Valid hook crap: %08X vs %08X\n", |
| 1108 | tmp.valid_hooks, t->valid_hooks); |
| 1109 | ret = -EINVAL; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1110 | goto put_module; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | } |
| 1112 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1113 | oldinfo = xt_replace_table(t, tmp.num_counters, newinfo, &ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | if (!oldinfo) |
| 1115 | goto put_module; |
| 1116 | |
| 1117 | /* Update module usage count based on number of rules */ |
| 1118 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", |
| 1119 | oldinfo->number, oldinfo->initial_entries, newinfo->number); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1120 | if ((oldinfo->number > oldinfo->initial_entries) || |
| 1121 | (newinfo->number <= oldinfo->initial_entries)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | module_put(t->me); |
| 1123 | if ((oldinfo->number > oldinfo->initial_entries) && |
| 1124 | (newinfo->number <= oldinfo->initial_entries)) |
| 1125 | module_put(t->me); |
| 1126 | |
| 1127 | /* Get the old counters. */ |
| 1128 | get_counters(oldinfo, counters); |
| 1129 | /* Decrease module usage counts and free resource */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1130 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
| 1131 | IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1132 | xt_free_table_info(oldinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | if (copy_to_user(tmp.counters, counters, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1134 | sizeof(struct xt_counters) * tmp.num_counters) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | ret = -EFAULT; |
| 1136 | vfree(counters); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1137 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | return ret; |
| 1139 | |
| 1140 | put_module: |
| 1141 | module_put(t->me); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1142 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | free_newinfo_counters_untrans: |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1144 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | free_newinfo_counters: |
| 1146 | vfree(counters); |
| 1147 | free_newinfo: |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1148 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | return ret; |
| 1150 | } |
| 1151 | |
| 1152 | /* We're lazy, and add to the first CPU; overflow works its fey magic |
| 1153 | * and everything is OK. */ |
| 1154 | static inline int |
| 1155 | add_counter_to_entry(struct ip6t_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1156 | const struct xt_counters addme[], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | unsigned int *i) |
| 1158 | { |
| 1159 | #if 0 |
| 1160 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", |
| 1161 | *i, |
| 1162 | (long unsigned int)e->counters.pcnt, |
| 1163 | (long unsigned int)e->counters.bcnt, |
| 1164 | (long unsigned int)addme[*i].pcnt, |
| 1165 | (long unsigned int)addme[*i].bcnt); |
| 1166 | #endif |
| 1167 | |
| 1168 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); |
| 1169 | |
| 1170 | (*i)++; |
| 1171 | return 0; |
| 1172 | } |
| 1173 | |
| 1174 | static int |
| 1175 | do_add_counters(void __user *user, unsigned int len) |
| 1176 | { |
| 1177 | unsigned int i; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1178 | struct xt_counters_info tmp, *paddc; |
| 1179 | struct xt_table_info *private; |
| 1180 | struct xt_table *t; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1181 | int ret = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1182 | void *loc_cpu_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | |
| 1184 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1185 | return -EFAULT; |
| 1186 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1187 | if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct xt_counters)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | return -EINVAL; |
| 1189 | |
Patrick McHardy | 3b84e92 | 2007-12-17 21:48:33 -0800 | [diff] [blame^] | 1190 | paddc = vmalloc_node(len, numa_node_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | if (!paddc) |
| 1192 | return -ENOMEM; |
| 1193 | |
| 1194 | if (copy_from_user(paddc, user, len) != 0) { |
| 1195 | ret = -EFAULT; |
| 1196 | goto free; |
| 1197 | } |
| 1198 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1199 | t = xt_find_table_lock(AF_INET6, tmp.name); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1200 | if (!t || IS_ERR(t)) { |
| 1201 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | goto free; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1203 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | |
| 1205 | write_lock_bh(&t->lock); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1206 | private = t->private; |
Solar Designer | 2c8ac66 | 2006-05-19 02:16:52 -0700 | [diff] [blame] | 1207 | if (private->number != tmp.num_counters) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | ret = -EINVAL; |
| 1209 | goto unlock_up_free; |
| 1210 | } |
| 1211 | |
| 1212 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1213 | /* Choose the copy that is on our node */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1214 | loc_cpu_entry = private->entries[smp_processor_id()]; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1215 | IP6T_ENTRY_ITERATE(loc_cpu_entry, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1216 | private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | add_counter_to_entry, |
| 1218 | paddc->counters, |
| 1219 | &i); |
| 1220 | unlock_up_free: |
| 1221 | write_unlock_bh(&t->lock); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1222 | xt_table_unlock(t); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1223 | module_put(t->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | free: |
| 1225 | vfree(paddc); |
| 1226 | |
| 1227 | return ret; |
| 1228 | } |
| 1229 | |
| 1230 | static int |
| 1231 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
| 1232 | { |
| 1233 | int ret; |
| 1234 | |
| 1235 | if (!capable(CAP_NET_ADMIN)) |
| 1236 | return -EPERM; |
| 1237 | |
| 1238 | switch (cmd) { |
| 1239 | case IP6T_SO_SET_REPLACE: |
| 1240 | ret = do_replace(user, len); |
| 1241 | break; |
| 1242 | |
| 1243 | case IP6T_SO_SET_ADD_COUNTERS: |
| 1244 | ret = do_add_counters(user, len); |
| 1245 | break; |
| 1246 | |
| 1247 | default: |
| 1248 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); |
| 1249 | ret = -EINVAL; |
| 1250 | } |
| 1251 | |
| 1252 | return ret; |
| 1253 | } |
| 1254 | |
| 1255 | static int |
| 1256 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1257 | { |
| 1258 | int ret; |
| 1259 | |
| 1260 | if (!capable(CAP_NET_ADMIN)) |
| 1261 | return -EPERM; |
| 1262 | |
| 1263 | switch (cmd) { |
| 1264 | case IP6T_SO_GET_INFO: { |
| 1265 | char name[IP6T_TABLE_MAXNAMELEN]; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1266 | struct xt_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | |
| 1268 | if (*len != sizeof(struct ip6t_getinfo)) { |
| 1269 | duprintf("length %u != %u\n", *len, |
| 1270 | sizeof(struct ip6t_getinfo)); |
| 1271 | ret = -EINVAL; |
| 1272 | break; |
| 1273 | } |
| 1274 | |
| 1275 | if (copy_from_user(name, user, sizeof(name)) != 0) { |
| 1276 | ret = -EFAULT; |
| 1277 | break; |
| 1278 | } |
| 1279 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1280 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1281 | t = try_then_request_module(xt_find_table_lock(AF_INET6, name), |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1282 | "ip6table_%s", name); |
| 1283 | if (t && !IS_ERR(t)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | struct ip6t_getinfo info; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1285 | struct xt_table_info *private = t->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | |
| 1287 | info.valid_hooks = t->valid_hooks; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1288 | memcpy(info.hook_entry, private->hook_entry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | sizeof(info.hook_entry)); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1290 | memcpy(info.underflow, private->underflow, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | sizeof(info.underflow)); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1292 | info.num_entries = private->number; |
| 1293 | info.size = private->size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | memcpy(info.name, name, sizeof(info.name)); |
| 1295 | |
| 1296 | if (copy_to_user(user, &info, *len) != 0) |
| 1297 | ret = -EFAULT; |
| 1298 | else |
| 1299 | ret = 0; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1300 | xt_table_unlock(t); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1301 | module_put(t->me); |
| 1302 | } else |
| 1303 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | } |
| 1305 | break; |
| 1306 | |
| 1307 | case IP6T_SO_GET_ENTRIES: { |
| 1308 | struct ip6t_get_entries get; |
| 1309 | |
| 1310 | if (*len < sizeof(get)) { |
| 1311 | duprintf("get_entries: %u < %u\n", *len, sizeof(get)); |
| 1312 | ret = -EINVAL; |
| 1313 | } else if (copy_from_user(&get, user, sizeof(get)) != 0) { |
| 1314 | ret = -EFAULT; |
| 1315 | } else if (*len != sizeof(struct ip6t_get_entries) + get.size) { |
| 1316 | duprintf("get_entries: %u != %u\n", *len, |
| 1317 | sizeof(struct ip6t_get_entries) + get.size); |
| 1318 | ret = -EINVAL; |
| 1319 | } else |
| 1320 | ret = get_entries(&get, user); |
| 1321 | break; |
| 1322 | } |
| 1323 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1324 | case IP6T_SO_GET_REVISION_MATCH: |
| 1325 | case IP6T_SO_GET_REVISION_TARGET: { |
| 1326 | struct ip6t_get_revision rev; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1327 | int target; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1328 | |
| 1329 | if (*len != sizeof(rev)) { |
| 1330 | ret = -EINVAL; |
| 1331 | break; |
| 1332 | } |
| 1333 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { |
| 1334 | ret = -EFAULT; |
| 1335 | break; |
| 1336 | } |
| 1337 | |
| 1338 | if (cmd == IP6T_SO_GET_REVISION_TARGET) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1339 | target = 1; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1340 | else |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1341 | target = 0; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1342 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1343 | try_then_request_module(xt_find_revision(AF_INET6, rev.name, |
| 1344 | rev.revision, |
| 1345 | target, &ret), |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1346 | "ip6t_%s", rev.name); |
| 1347 | break; |
| 1348 | } |
| 1349 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | default: |
| 1351 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); |
| 1352 | ret = -EINVAL; |
| 1353 | } |
| 1354 | |
| 1355 | return ret; |
| 1356 | } |
| 1357 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1358 | int ip6t_register_table(struct xt_table *table, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | const struct ip6t_replace *repl) |
| 1360 | { |
| 1361 | int ret; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1362 | struct xt_table_info *newinfo; |
Eric Dumazet | 259d4e4 | 2007-12-04 23:24:56 -0800 | [diff] [blame] | 1363 | struct xt_table_info bootstrap |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1365 | void *loc_cpu_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1367 | newinfo = xt_alloc_table_info(repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | if (!newinfo) |
| 1369 | return -ENOMEM; |
| 1370 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1371 | /* choose the copy on our node/cpu */ |
| 1372 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 1373 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | |
| 1375 | ret = translate_table(table->name, table->valid_hooks, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1376 | newinfo, loc_cpu_entry, repl->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | repl->num_entries, |
| 1378 | repl->hook_entry, |
| 1379 | repl->underflow); |
| 1380 | if (ret != 0) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1381 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | return ret; |
| 1383 | } |
| 1384 | |
Patrick McHardy | da298d3 | 2006-06-27 03:00:09 -0700 | [diff] [blame] | 1385 | ret = xt_register_table(table, &bootstrap, newinfo); |
| 1386 | if (ret != 0) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1387 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | return ret; |
| 1389 | } |
| 1390 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1391 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | } |
| 1393 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1394 | void ip6t_unregister_table(struct xt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1396 | struct xt_table_info *private; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1397 | void *loc_cpu_entry; |
| 1398 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1399 | private = xt_unregister_table(table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | |
| 1401 | /* Decrease module usage counts and free resources */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1402 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
| 1403 | IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); |
| 1404 | xt_free_table_info(private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | } |
| 1406 | |
| 1407 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 1408 | static inline bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
| 1410 | u_int8_t type, u_int8_t code, |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 1411 | bool invert) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | { |
| 1413 | return (type == test_type && code >= min_code && code <= max_code) |
| 1414 | ^ invert; |
| 1415 | } |
| 1416 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 1417 | static bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | icmp6_match(const struct sk_buff *skb, |
| 1419 | const struct net_device *in, |
| 1420 | const struct net_device *out, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame] | 1421 | const struct xt_match *match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | const void *matchinfo, |
| 1423 | int offset, |
| 1424 | unsigned int protoff, |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 1425 | bool *hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | { |
| 1427 | struct icmp6hdr _icmp, *ic; |
| 1428 | const struct ip6t_icmp *icmpinfo = matchinfo; |
| 1429 | |
| 1430 | /* Must not be a fragment. */ |
| 1431 | if (offset) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 1432 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | |
| 1434 | ic = skb_header_pointer(skb, protoff, sizeof(_icmp), &_icmp); |
| 1435 | if (ic == NULL) { |
| 1436 | /* We've been asked to examine this packet, and we |
| 1437 | can't. Hence, no choice but to drop. */ |
| 1438 | duprintf("Dropping evil ICMP tinygram.\n"); |
Jan Engelhardt | cff533a | 2007-07-07 22:15:12 -0700 | [diff] [blame] | 1439 | *hotdrop = true; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 1440 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | } |
| 1442 | |
| 1443 | return icmp6_type_code_match(icmpinfo->type, |
| 1444 | icmpinfo->code[0], |
| 1445 | icmpinfo->code[1], |
| 1446 | ic->icmp6_type, ic->icmp6_code, |
| 1447 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); |
| 1448 | } |
| 1449 | |
| 1450 | /* Called when user tries to insert an entry of this type. */ |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 1451 | static bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | icmp6_checkentry(const char *tablename, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1453 | const void *entry, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame] | 1454 | const struct xt_match *match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | void *matchinfo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | unsigned int hook_mask) |
| 1457 | { |
| 1458 | const struct ip6t_icmp *icmpinfo = matchinfo; |
| 1459 | |
Patrick McHardy | 7f93971 | 2006-03-20 18:01:43 -0800 | [diff] [blame] | 1460 | /* Must specify no unknown invflags */ |
| 1461 | return !(icmpinfo->invflags & ~IP6T_ICMP_INV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | } |
| 1463 | |
| 1464 | /* The built-in targets: standard (NULL) and error. */ |
Patrick McHardy | 9f15c53 | 2007-07-07 22:22:02 -0700 | [diff] [blame] | 1465 | static struct xt_target ip6t_standard_target __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | .name = IP6T_STANDARD_TARGET, |
Patrick McHardy | 7f93971 | 2006-03-20 18:01:43 -0800 | [diff] [blame] | 1467 | .targetsize = sizeof(int), |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 1468 | .family = AF_INET6, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | }; |
| 1470 | |
Patrick McHardy | 9f15c53 | 2007-07-07 22:22:02 -0700 | [diff] [blame] | 1471 | static struct xt_target ip6t_error_target __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | .name = IP6T_ERROR_TARGET, |
| 1473 | .target = ip6t_error, |
Patrick McHardy | 7f93971 | 2006-03-20 18:01:43 -0800 | [diff] [blame] | 1474 | .targetsize = IP6T_FUNCTION_MAXNAMELEN, |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 1475 | .family = AF_INET6, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | }; |
| 1477 | |
| 1478 | static struct nf_sockopt_ops ip6t_sockopts = { |
| 1479 | .pf = PF_INET6, |
| 1480 | .set_optmin = IP6T_BASE_CTL, |
| 1481 | .set_optmax = IP6T_SO_SET_MAX+1, |
| 1482 | .set = do_ip6t_set_ctl, |
| 1483 | .get_optmin = IP6T_BASE_CTL, |
| 1484 | .get_optmax = IP6T_SO_GET_MAX+1, |
| 1485 | .get = do_ip6t_get_ctl, |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 1486 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | }; |
| 1488 | |
Patrick McHardy | 9f15c53 | 2007-07-07 22:22:02 -0700 | [diff] [blame] | 1489 | static struct xt_match icmp6_matchstruct __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | .name = "icmp6", |
| 1491 | .match = &icmp6_match, |
Patrick McHardy | 7f93971 | 2006-03-20 18:01:43 -0800 | [diff] [blame] | 1492 | .matchsize = sizeof(struct ip6t_icmp), |
| 1493 | .checkentry = icmp6_checkentry, |
| 1494 | .proto = IPPROTO_ICMPV6, |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 1495 | .family = AF_INET6, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | }; |
| 1497 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1498 | static int __init ip6_tables_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | { |
| 1500 | int ret; |
| 1501 | |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1502 | ret = xt_proto_init(AF_INET6); |
| 1503 | if (ret < 0) |
| 1504 | goto err1; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | /* Noone else will be downing sem now, so we won't sleep */ |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1507 | ret = xt_register_target(&ip6t_standard_target); |
| 1508 | if (ret < 0) |
| 1509 | goto err2; |
| 1510 | ret = xt_register_target(&ip6t_error_target); |
| 1511 | if (ret < 0) |
| 1512 | goto err3; |
| 1513 | ret = xt_register_match(&icmp6_matchstruct); |
| 1514 | if (ret < 0) |
| 1515 | goto err4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | |
| 1517 | /* Register setsockopt */ |
| 1518 | ret = nf_register_sockopt(&ip6t_sockopts); |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1519 | if (ret < 0) |
| 1520 | goto err5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | |
Patrick McHardy | a887c1c | 2007-07-14 20:46:15 -0700 | [diff] [blame] | 1522 | printk(KERN_INFO "ip6_tables: (C) 2000-2006 Netfilter Core Team\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | return 0; |
Patrick McHardy | 0eff66e | 2006-08-13 18:57:28 -0700 | [diff] [blame] | 1524 | |
| 1525 | err5: |
| 1526 | xt_unregister_match(&icmp6_matchstruct); |
| 1527 | err4: |
| 1528 | xt_unregister_target(&ip6t_error_target); |
| 1529 | err3: |
| 1530 | xt_unregister_target(&ip6t_standard_target); |
| 1531 | err2: |
| 1532 | xt_proto_fini(AF_INET6); |
| 1533 | err1: |
| 1534 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | } |
| 1536 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1537 | static void __exit ip6_tables_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | { |
| 1539 | nf_unregister_sockopt(&ip6t_sockopts); |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 1540 | xt_unregister_match(&icmp6_matchstruct); |
| 1541 | xt_unregister_target(&ip6t_error_target); |
| 1542 | xt_unregister_target(&ip6t_standard_target); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1543 | xt_proto_fini(AF_INET6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | } |
| 1545 | |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1546 | /* |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 1547 | * find the offset to specified header or the protocol number of last header |
| 1548 | * if target < 0. "last header" is transport protocol header, ESP, or |
| 1549 | * "No next header". |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1550 | * |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 1551 | * If target header is found, its offset is set in *offset and return protocol |
| 1552 | * number. Otherwise, return -1. |
| 1553 | * |
Patrick McHardy | 6d38163 | 2006-10-24 16:15:10 -0700 | [diff] [blame] | 1554 | * If the first fragment doesn't contain the final protocol header or |
| 1555 | * NEXTHDR_NONE it is considered invalid. |
| 1556 | * |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 1557 | * Note that non-1st fragment is special case that "the protocol number |
| 1558 | * of last header" is "next header" field in Fragment header. In this case, |
| 1559 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff |
| 1560 | * isn't NULL. |
| 1561 | * |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1562 | */ |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 1563 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
| 1564 | int target, unsigned short *fragoff) |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1565 | { |
Arnaldo Carvalho de Melo | 6b88dd9 | 2007-03-19 22:29:03 -0300 | [diff] [blame] | 1566 | unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1567 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1568 | unsigned int len = skb->len - start; |
| 1569 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 1570 | if (fragoff) |
| 1571 | *fragoff = 0; |
| 1572 | |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1573 | while (nexthdr != target) { |
| 1574 | struct ipv6_opt_hdr _hdr, *hp; |
| 1575 | unsigned int hdrlen; |
| 1576 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 1577 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
| 1578 | if (target < 0) |
| 1579 | break; |
Patrick McHardy | 6d38163 | 2006-10-24 16:15:10 -0700 | [diff] [blame] | 1580 | return -ENOENT; |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 1581 | } |
| 1582 | |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1583 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
| 1584 | if (hp == NULL) |
Patrick McHardy | 6d38163 | 2006-10-24 16:15:10 -0700 | [diff] [blame] | 1585 | return -EBADMSG; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1586 | if (nexthdr == NEXTHDR_FRAGMENT) { |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 1587 | unsigned short _frag_off; |
| 1588 | __be16 *fp; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1589 | fp = skb_header_pointer(skb, |
| 1590 | start+offsetof(struct frag_hdr, |
| 1591 | frag_off), |
| 1592 | sizeof(_frag_off), |
| 1593 | &_frag_off); |
| 1594 | if (fp == NULL) |
Patrick McHardy | 6d38163 | 2006-10-24 16:15:10 -0700 | [diff] [blame] | 1595 | return -EBADMSG; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1596 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 1597 | _frag_off = ntohs(*fp) & ~0x7; |
| 1598 | if (_frag_off) { |
| 1599 | if (target < 0 && |
| 1600 | ((!ipv6_ext_hdr(hp->nexthdr)) || |
Patrick McHardy | 337dde7 | 2006-11-14 19:49:13 -0800 | [diff] [blame] | 1601 | hp->nexthdr == NEXTHDR_NONE)) { |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 1602 | if (fragoff) |
| 1603 | *fragoff = _frag_off; |
| 1604 | return hp->nexthdr; |
| 1605 | } |
Patrick McHardy | 6d38163 | 2006-10-24 16:15:10 -0700 | [diff] [blame] | 1606 | return -ENOENT; |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 1607 | } |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1608 | hdrlen = 8; |
| 1609 | } else if (nexthdr == NEXTHDR_AUTH) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1610 | hdrlen = (hp->hdrlen + 2) << 2; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1611 | else |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1612 | hdrlen = ipv6_optlen(hp); |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1613 | |
| 1614 | nexthdr = hp->nexthdr; |
| 1615 | len -= hdrlen; |
| 1616 | start += hdrlen; |
| 1617 | } |
| 1618 | |
| 1619 | *offset = start; |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 1620 | return nexthdr; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1621 | } |
| 1622 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | EXPORT_SYMBOL(ip6t_register_table); |
| 1624 | EXPORT_SYMBOL(ip6t_unregister_table); |
| 1625 | EXPORT_SYMBOL(ip6t_do_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | EXPORT_SYMBOL(ip6t_ext_hdr); |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 1627 | EXPORT_SYMBOL(ipv6_find_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1629 | module_init(ip6_tables_init); |
| 1630 | module_exit(ip6_tables_fini); |