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. |
| 10 | * |
| 11 | * 19 Jan 2002 Harald Welte <laforge@gnumonks.org> |
| 12 | * - increase module usage count as soon as we have rules inside |
| 13 | * a table |
| 14 | * 06 Jun 2002 Andras Kis-Szabo <kisza@sch.bme.hu> |
| 15 | * - new extension header parser code |
| 16 | */ |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 17 | |
| 18 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/config.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 20 | #include <linux/in.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/skbuff.h> |
| 22 | #include <linux/kmod.h> |
| 23 | #include <linux/vmalloc.h> |
| 24 | #include <linux/netdevice.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/tcp.h> |
| 27 | #include <linux/udp.h> |
| 28 | #include <linux/icmpv6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <net/ipv6.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | #include <asm/semaphore.h> |
| 32 | #include <linux/proc_fs.h> |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 33 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | #include <linux/netfilter_ipv6/ip6_tables.h> |
| 36 | |
| 37 | MODULE_LICENSE("GPL"); |
| 38 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 39 | MODULE_DESCRIPTION("IPv6 packet filter"); |
| 40 | |
| 41 | #define IPV6_HDR_LEN (sizeof(struct ipv6hdr)) |
| 42 | #define IPV6_OPTHDR_LEN (sizeof(struct ipv6_opt_hdr)) |
| 43 | |
| 44 | /*#define DEBUG_IP_FIREWALL*/ |
| 45 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ |
| 46 | /*#define DEBUG_IP_FIREWALL_USER*/ |
| 47 | |
| 48 | #ifdef DEBUG_IP_FIREWALL |
| 49 | #define dprintf(format, args...) printk(format , ## args) |
| 50 | #else |
| 51 | #define dprintf(format, args...) |
| 52 | #endif |
| 53 | |
| 54 | #ifdef DEBUG_IP_FIREWALL_USER |
| 55 | #define duprintf(format, args...) printk(format , ## args) |
| 56 | #else |
| 57 | #define duprintf(format, args...) |
| 58 | #endif |
| 59 | |
| 60 | #ifdef CONFIG_NETFILTER_DEBUG |
| 61 | #define IP_NF_ASSERT(x) \ |
| 62 | do { \ |
| 63 | if (!(x)) \ |
| 64 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ |
| 65 | __FUNCTION__, __FILE__, __LINE__); \ |
| 66 | } while(0) |
| 67 | #else |
| 68 | #define IP_NF_ASSERT(x) |
| 69 | #endif |
| 70 | #define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1)) |
| 71 | |
| 72 | static DECLARE_MUTEX(ip6t_mutex); |
| 73 | |
| 74 | /* Must have mutex */ |
| 75 | #define ASSERT_READ_LOCK(x) IP_NF_ASSERT(down_trylock(&ip6t_mutex) != 0) |
| 76 | #define ASSERT_WRITE_LOCK(x) IP_NF_ASSERT(down_trylock(&ip6t_mutex) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | #include <linux/netfilter_ipv4/listhelp.h> |
| 78 | |
| 79 | #if 0 |
| 80 | /* All the better to debug you with... */ |
| 81 | #define static |
| 82 | #define inline |
| 83 | #endif |
| 84 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 85 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | 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] | 87 | them in the softirq when updating the counters and therefore |
| 88 | only need to read-lock in the softirq; doing a write_lock_bh() in user |
| 89 | context stops packets coming through and allows user context to read |
| 90 | the counters or update the rules. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | Hence the start of any table is given by get_table() below. */ |
| 93 | |
| 94 | /* The table itself */ |
| 95 | struct ip6t_table_info |
| 96 | { |
| 97 | /* Size per table */ |
| 98 | unsigned int size; |
| 99 | /* Number of entries: FIXME. --RR */ |
| 100 | unsigned int number; |
| 101 | /* Initial number of entries. Needed for module usage count */ |
| 102 | unsigned int initial_entries; |
| 103 | |
| 104 | /* Entry points and underflows */ |
| 105 | unsigned int hook_entry[NF_IP6_NUMHOOKS]; |
| 106 | unsigned int underflow[NF_IP6_NUMHOOKS]; |
| 107 | |
| 108 | /* ip6t_entry tables: one per CPU */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 109 | void *entries[NR_CPUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | }; |
| 111 | |
| 112 | static LIST_HEAD(ip6t_target); |
| 113 | static LIST_HEAD(ip6t_match); |
| 114 | static LIST_HEAD(ip6t_tables); |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 115 | #define SET_COUNTER(c,b,p) do { (c).bcnt = (b); (c).pcnt = (p); } while(0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | #define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0) |
| 117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | #if 0 |
| 119 | #define down(x) do { printk("DOWN:%u:" #x "\n", __LINE__); down(x); } while(0) |
| 120 | #define down_interruptible(x) ({ int __r; printk("DOWNi:%u:" #x "\n", __LINE__); __r = down_interruptible(x); if (__r != 0) printk("ABORT-DOWNi:%u\n", __LINE__); __r; }) |
| 121 | #define up(x) do { printk("UP:%u:" #x "\n", __LINE__); up(x); } while(0) |
| 122 | #endif |
| 123 | |
Patrick McHardy | 22dea56 | 2006-01-05 12:21:34 -0800 | [diff] [blame] | 124 | int |
| 125 | ip6_masked_addrcmp(const struct in6_addr *addr1, const struct in6_addr *mask, |
| 126 | const struct in6_addr *addr2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | { |
| 128 | int i; |
| 129 | for( i = 0; i < 16; i++){ |
Patrick McHardy | 22dea56 | 2006-01-05 12:21:34 -0800 | [diff] [blame] | 130 | if((addr1->s6_addr[i] & mask->s6_addr[i]) != |
| 131 | (addr2->s6_addr[i] & mask->s6_addr[i])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | return 1; |
| 133 | } |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | /* Check for an extension */ |
| 138 | int |
| 139 | ip6t_ext_hdr(u8 nexthdr) |
| 140 | { |
| 141 | return ( (nexthdr == IPPROTO_HOPOPTS) || |
| 142 | (nexthdr == IPPROTO_ROUTING) || |
| 143 | (nexthdr == IPPROTO_FRAGMENT) || |
| 144 | (nexthdr == IPPROTO_ESP) || |
| 145 | (nexthdr == IPPROTO_AH) || |
| 146 | (nexthdr == IPPROTO_NONE) || |
| 147 | (nexthdr == IPPROTO_DSTOPTS) ); |
| 148 | } |
| 149 | |
| 150 | /* Returns whether matches rule or not. */ |
| 151 | static inline int |
| 152 | ip6_packet_match(const struct sk_buff *skb, |
| 153 | const char *indev, |
| 154 | const char *outdev, |
| 155 | const struct ip6t_ip6 *ip6info, |
| 156 | unsigned int *protoff, |
| 157 | int *fragoff) |
| 158 | { |
| 159 | size_t i; |
| 160 | unsigned long ret; |
| 161 | const struct ipv6hdr *ipv6 = skb->nh.ipv6h; |
| 162 | |
| 163 | #define FWINV(bool,invflg) ((bool) ^ !!(ip6info->invflags & invflg)) |
| 164 | |
Patrick McHardy | 22dea56 | 2006-01-05 12:21:34 -0800 | [diff] [blame] | 165 | if (FWINV(ip6_masked_addrcmp(&ipv6->saddr, &ip6info->smsk, |
| 166 | &ip6info->src), IP6T_INV_SRCIP) |
| 167 | || FWINV(ip6_masked_addrcmp(&ipv6->daddr, &ip6info->dmsk, |
| 168 | &ip6info->dst), IP6T_INV_DSTIP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | dprintf("Source or dest mismatch.\n"); |
| 170 | /* |
| 171 | dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr, |
| 172 | ipinfo->smsk.s_addr, ipinfo->src.s_addr, |
| 173 | ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : ""); |
| 174 | dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr, |
| 175 | ipinfo->dmsk.s_addr, ipinfo->dst.s_addr, |
| 176 | ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/ |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | /* Look for ifname matches; this should unroll nicely. */ |
| 181 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { |
| 182 | ret |= (((const unsigned long *)indev)[i] |
| 183 | ^ ((const unsigned long *)ip6info->iniface)[i]) |
| 184 | & ((const unsigned long *)ip6info->iniface_mask)[i]; |
| 185 | } |
| 186 | |
| 187 | if (FWINV(ret != 0, IP6T_INV_VIA_IN)) { |
| 188 | dprintf("VIA in mismatch (%s vs %s).%s\n", |
| 189 | indev, ip6info->iniface, |
| 190 | ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":""); |
| 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { |
| 195 | ret |= (((const unsigned long *)outdev)[i] |
| 196 | ^ ((const unsigned long *)ip6info->outiface)[i]) |
| 197 | & ((const unsigned long *)ip6info->outiface_mask)[i]; |
| 198 | } |
| 199 | |
| 200 | if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) { |
| 201 | dprintf("VIA out mismatch (%s vs %s).%s\n", |
| 202 | outdev, ip6info->outiface, |
| 203 | ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":""); |
| 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | /* ... might want to do something with class and flowlabel here ... */ |
| 208 | |
| 209 | /* look for the desired protocol header */ |
| 210 | if((ip6info->flags & IP6T_F_PROTO)) { |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 211 | int protohdr; |
| 212 | unsigned short _frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 214 | protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off); |
| 215 | if (protohdr < 0) |
| 216 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 218 | *fragoff = _frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | dprintf("Packet protocol %hi ?= %s%hi.\n", |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 221 | protohdr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | ip6info->invflags & IP6T_INV_PROTO ? "!":"", |
| 223 | ip6info->proto); |
| 224 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 225 | if (ip6info->proto == protohdr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | if(ip6info->invflags & IP6T_INV_PROTO) { |
| 227 | return 0; |
| 228 | } |
| 229 | return 1; |
| 230 | } |
| 231 | |
| 232 | /* We need match for the '-p all', too! */ |
| 233 | if ((ip6info->proto != 0) && |
| 234 | !(ip6info->invflags & IP6T_INV_PROTO)) |
| 235 | return 0; |
| 236 | } |
| 237 | return 1; |
| 238 | } |
| 239 | |
| 240 | /* should be ip6 safe */ |
| 241 | static inline int |
| 242 | ip6_checkentry(const struct ip6t_ip6 *ipv6) |
| 243 | { |
| 244 | if (ipv6->flags & ~IP6T_F_MASK) { |
| 245 | duprintf("Unknown flag bits set: %08X\n", |
| 246 | ipv6->flags & ~IP6T_F_MASK); |
| 247 | return 0; |
| 248 | } |
| 249 | if (ipv6->invflags & ~IP6T_INV_MASK) { |
| 250 | duprintf("Unknown invflag bits set: %08X\n", |
| 251 | ipv6->invflags & ~IP6T_INV_MASK); |
| 252 | return 0; |
| 253 | } |
| 254 | return 1; |
| 255 | } |
| 256 | |
| 257 | static unsigned int |
| 258 | ip6t_error(struct sk_buff **pskb, |
| 259 | const struct net_device *in, |
| 260 | const struct net_device *out, |
| 261 | unsigned int hooknum, |
| 262 | const void *targinfo, |
| 263 | void *userinfo) |
| 264 | { |
| 265 | if (net_ratelimit()) |
| 266 | printk("ip6_tables: error: `%s'\n", (char *)targinfo); |
| 267 | |
| 268 | return NF_DROP; |
| 269 | } |
| 270 | |
| 271 | static inline |
| 272 | int do_match(struct ip6t_entry_match *m, |
| 273 | const struct sk_buff *skb, |
| 274 | const struct net_device *in, |
| 275 | const struct net_device *out, |
| 276 | int offset, |
| 277 | unsigned int protoff, |
| 278 | int *hotdrop) |
| 279 | { |
| 280 | /* Stop iteration if it doesn't match */ |
| 281 | if (!m->u.kernel.match->match(skb, in, out, m->data, |
| 282 | offset, protoff, hotdrop)) |
| 283 | return 1; |
| 284 | else |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | static inline struct ip6t_entry * |
| 289 | get_entry(void *base, unsigned int offset) |
| 290 | { |
| 291 | return (struct ip6t_entry *)(base + offset); |
| 292 | } |
| 293 | |
| 294 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
| 295 | unsigned int |
| 296 | ip6t_do_table(struct sk_buff **pskb, |
| 297 | unsigned int hook, |
| 298 | const struct net_device *in, |
| 299 | const struct net_device *out, |
| 300 | struct ip6t_table *table, |
| 301 | void *userdata) |
| 302 | { |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 303 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | int offset = 0; |
| 305 | unsigned int protoff = 0; |
| 306 | int hotdrop = 0; |
| 307 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
| 308 | unsigned int verdict = NF_DROP; |
| 309 | const char *indev, *outdev; |
| 310 | void *table_base; |
| 311 | struct ip6t_entry *e, *back; |
| 312 | |
| 313 | /* Initialization */ |
| 314 | indev = in ? in->name : nulldevname; |
| 315 | outdev = out ? out->name : nulldevname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | /* We handle fragments by dealing with the first fragment as |
| 317 | * if it was a normal packet. All other fragments are treated |
| 318 | * normally, except that they will NEVER match rules that ask |
| 319 | * things we don't know, ie. tcp syn flag or ports). If the |
| 320 | * rule is also a fragment-specific rule, non-fragments won't |
| 321 | * match it. */ |
| 322 | |
| 323 | read_lock_bh(&table->lock); |
| 324 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 325 | table_base = (void *)table->private->entries[smp_processor_id()]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | e = get_entry(table_base, table->private->hook_entry[hook]); |
| 327 | |
| 328 | #ifdef CONFIG_NETFILTER_DEBUG |
| 329 | /* Check noone else using our table */ |
| 330 | if (((struct ip6t_entry *)table_base)->comefrom != 0xdead57ac |
| 331 | && ((struct ip6t_entry *)table_base)->comefrom != 0xeeeeeeec) { |
| 332 | printk("ASSERT: CPU #%u, %s comefrom(%p) = %X\n", |
| 333 | smp_processor_id(), |
| 334 | table->name, |
| 335 | &((struct ip6t_entry *)table_base)->comefrom, |
| 336 | ((struct ip6t_entry *)table_base)->comefrom); |
| 337 | } |
| 338 | ((struct ip6t_entry *)table_base)->comefrom = 0x57acc001; |
| 339 | #endif |
| 340 | |
| 341 | /* For return from builtin chain */ |
| 342 | back = get_entry(table_base, table->private->underflow[hook]); |
| 343 | |
| 344 | do { |
| 345 | IP_NF_ASSERT(e); |
| 346 | IP_NF_ASSERT(back); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | if (ip6_packet_match(*pskb, indev, outdev, &e->ipv6, |
| 348 | &protoff, &offset)) { |
| 349 | struct ip6t_entry_target *t; |
| 350 | |
| 351 | if (IP6T_MATCH_ITERATE(e, do_match, |
| 352 | *pskb, in, out, |
| 353 | offset, protoff, &hotdrop) != 0) |
| 354 | goto no_match; |
| 355 | |
| 356 | ADD_COUNTER(e->counters, |
| 357 | ntohs((*pskb)->nh.ipv6h->payload_len) |
| 358 | + IPV6_HDR_LEN, |
| 359 | 1); |
| 360 | |
| 361 | t = ip6t_get_target(e); |
| 362 | IP_NF_ASSERT(t->u.kernel.target); |
| 363 | /* Standard target? */ |
| 364 | if (!t->u.kernel.target->target) { |
| 365 | int v; |
| 366 | |
| 367 | v = ((struct ip6t_standard_target *)t)->verdict; |
| 368 | if (v < 0) { |
| 369 | /* Pop from stack? */ |
| 370 | if (v != IP6T_RETURN) { |
| 371 | verdict = (unsigned)(-v) - 1; |
| 372 | break; |
| 373 | } |
| 374 | e = back; |
| 375 | back = get_entry(table_base, |
| 376 | back->comefrom); |
| 377 | continue; |
| 378 | } |
Patrick McHardy | 0546534 | 2005-08-21 23:31:43 -0700 | [diff] [blame] | 379 | if (table_base + v != (void *)e + e->next_offset |
| 380 | && !(e->ipv6.flags & IP6T_F_GOTO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | /* Save old back ptr in next entry */ |
| 382 | struct ip6t_entry *next |
| 383 | = (void *)e + e->next_offset; |
| 384 | next->comefrom |
| 385 | = (void *)back - table_base; |
| 386 | /* set back pointer to next entry */ |
| 387 | back = next; |
| 388 | } |
| 389 | |
| 390 | e = get_entry(table_base, v); |
| 391 | } else { |
| 392 | /* Targets which reenter must return |
| 393 | abs. verdicts */ |
| 394 | #ifdef CONFIG_NETFILTER_DEBUG |
| 395 | ((struct ip6t_entry *)table_base)->comefrom |
| 396 | = 0xeeeeeeec; |
| 397 | #endif |
| 398 | verdict = t->u.kernel.target->target(pskb, |
| 399 | in, out, |
| 400 | hook, |
| 401 | t->data, |
| 402 | userdata); |
| 403 | |
| 404 | #ifdef CONFIG_NETFILTER_DEBUG |
| 405 | if (((struct ip6t_entry *)table_base)->comefrom |
| 406 | != 0xeeeeeeec |
| 407 | && verdict == IP6T_CONTINUE) { |
| 408 | printk("Target %s reentered!\n", |
| 409 | t->u.kernel.target->name); |
| 410 | verdict = NF_DROP; |
| 411 | } |
| 412 | ((struct ip6t_entry *)table_base)->comefrom |
| 413 | = 0x57acc001; |
| 414 | #endif |
| 415 | if (verdict == IP6T_CONTINUE) |
| 416 | e = (void *)e + e->next_offset; |
| 417 | else |
| 418 | /* Verdict */ |
| 419 | break; |
| 420 | } |
| 421 | } else { |
| 422 | |
| 423 | no_match: |
| 424 | e = (void *)e + e->next_offset; |
| 425 | } |
| 426 | } while (!hotdrop); |
| 427 | |
| 428 | #ifdef CONFIG_NETFILTER_DEBUG |
| 429 | ((struct ip6t_entry *)table_base)->comefrom = 0xdead57ac; |
| 430 | #endif |
| 431 | read_unlock_bh(&table->lock); |
| 432 | |
| 433 | #ifdef DEBUG_ALLOW_ALL |
| 434 | return NF_ACCEPT; |
| 435 | #else |
| 436 | if (hotdrop) |
| 437 | return NF_DROP; |
| 438 | else return verdict; |
| 439 | #endif |
| 440 | } |
| 441 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 442 | /* |
| 443 | * These are weird, but module loading must not be done with mutex |
| 444 | * held (since they will register), and we have to have a single |
| 445 | * function to use try_then_request_module(). |
| 446 | */ |
| 447 | |
| 448 | /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */ |
| 449 | static inline struct ip6t_table *find_table_lock(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | { |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 451 | struct ip6t_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 453 | if (down_interruptible(&ip6t_mutex) != 0) |
| 454 | return ERR_PTR(-EINTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 456 | list_for_each_entry(t, &ip6t_tables, list) |
| 457 | if (strcmp(t->name, name) == 0 && try_module_get(t->me)) |
| 458 | return t; |
| 459 | up(&ip6t_mutex); |
| 460 | return NULL; |
| 461 | } |
| 462 | |
| 463 | /* Find match, grabs ref. Returns ERR_PTR() on error. */ |
| 464 | static inline struct ip6t_match *find_match(const char *name, u8 revision) |
| 465 | { |
| 466 | struct ip6t_match *m; |
| 467 | int err = 0; |
| 468 | |
| 469 | if (down_interruptible(&ip6t_mutex) != 0) |
| 470 | return ERR_PTR(-EINTR); |
| 471 | |
| 472 | list_for_each_entry(m, &ip6t_match, list) { |
| 473 | if (strcmp(m->name, name) == 0) { |
| 474 | if (m->revision == revision) { |
| 475 | if (try_module_get(m->me)) { |
| 476 | up(&ip6t_mutex); |
| 477 | return m; |
| 478 | } |
| 479 | } else |
| 480 | err = -EPROTOTYPE; /* Found something. */ |
| 481 | } |
| 482 | } |
| 483 | up(&ip6t_mutex); |
| 484 | return ERR_PTR(err); |
| 485 | } |
| 486 | |
| 487 | /* Find target, grabs ref. Returns ERR_PTR() on error. */ |
| 488 | static inline struct ip6t_target *find_target(const char *name, u8 revision) |
| 489 | { |
| 490 | struct ip6t_target *t; |
| 491 | int err = 0; |
| 492 | |
| 493 | if (down_interruptible(&ip6t_mutex) != 0) |
| 494 | return ERR_PTR(-EINTR); |
| 495 | |
| 496 | list_for_each_entry(t, &ip6t_target, list) { |
| 497 | if (strcmp(t->name, name) == 0) { |
| 498 | if (t->revision == revision) { |
| 499 | if (try_module_get(t->me)) { |
| 500 | up(&ip6t_mutex); |
| 501 | return t; |
| 502 | } |
| 503 | } else |
| 504 | err = -EPROTOTYPE; /* Found something. */ |
| 505 | } |
| 506 | } |
| 507 | up(&ip6t_mutex); |
| 508 | return ERR_PTR(err); |
| 509 | } |
| 510 | |
| 511 | struct ip6t_target *ip6t_find_target(const char *name, u8 revision) |
| 512 | { |
| 513 | struct ip6t_target *target; |
| 514 | |
| 515 | target = try_then_request_module(find_target(name, revision), |
| 516 | "ip6t_%s", name); |
| 517 | if (IS_ERR(target) || !target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | return NULL; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 519 | return target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | } |
| 521 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 522 | static int match_revfn(const char *name, u8 revision, int *bestp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | { |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 524 | struct ip6t_match *m; |
| 525 | int have_rev = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 527 | list_for_each_entry(m, &ip6t_match, list) { |
| 528 | if (strcmp(m->name, name) == 0) { |
| 529 | if (m->revision > *bestp) |
| 530 | *bestp = m->revision; |
| 531 | if (m->revision == revision) |
| 532 | have_rev = 1; |
| 533 | } |
| 534 | } |
| 535 | return have_rev; |
| 536 | } |
| 537 | |
| 538 | static int target_revfn(const char *name, u8 revision, int *bestp) |
| 539 | { |
| 540 | struct ip6t_target *t; |
| 541 | int have_rev = 0; |
| 542 | |
| 543 | list_for_each_entry(t, &ip6t_target, list) { |
| 544 | if (strcmp(t->name, name) == 0) { |
| 545 | if (t->revision > *bestp) |
| 546 | *bestp = t->revision; |
| 547 | if (t->revision == revision) |
| 548 | have_rev = 1; |
| 549 | } |
| 550 | } |
| 551 | return have_rev; |
| 552 | } |
| 553 | |
| 554 | /* Returns true or fals (if no such extension at all) */ |
| 555 | static inline int find_revision(const char *name, u8 revision, |
| 556 | int (*revfn)(const char *, u8, int *), |
| 557 | int *err) |
| 558 | { |
| 559 | int have_rev, best = -1; |
| 560 | |
| 561 | if (down_interruptible(&ip6t_mutex) != 0) { |
| 562 | *err = -EINTR; |
| 563 | return 1; |
| 564 | } |
| 565 | have_rev = revfn(name, revision, &best); |
| 566 | up(&ip6t_mutex); |
| 567 | |
| 568 | /* Nothing at all? Return 0 to try loading module. */ |
| 569 | if (best == -1) { |
| 570 | *err = -ENOENT; |
| 571 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | } |
| 573 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 574 | *err = best; |
| 575 | if (!have_rev) |
| 576 | *err = -EPROTONOSUPPORT; |
| 577 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | } |
| 579 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | |
| 581 | /* All zeroes == unconditional rule. */ |
| 582 | static inline int |
| 583 | unconditional(const struct ip6t_ip6 *ipv6) |
| 584 | { |
| 585 | unsigned int i; |
| 586 | |
| 587 | for (i = 0; i < sizeof(*ipv6); i++) |
| 588 | if (((char *)ipv6)[i]) |
| 589 | break; |
| 590 | |
| 591 | return (i == sizeof(*ipv6)); |
| 592 | } |
| 593 | |
| 594 | /* Figures out from what hook each rule can be called: returns 0 if |
| 595 | there are loops. Puts hook bitmask in comefrom. */ |
| 596 | static int |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 597 | mark_source_chains(struct ip6t_table_info *newinfo, |
| 598 | unsigned int valid_hooks, void *entry0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | { |
| 600 | unsigned int hook; |
| 601 | |
| 602 | /* No recursion; use packet counter to save back ptrs (reset |
| 603 | to 0 as we leave), and comefrom to save source hook bitmask */ |
| 604 | for (hook = 0; hook < NF_IP6_NUMHOOKS; hook++) { |
| 605 | unsigned int pos = newinfo->hook_entry[hook]; |
| 606 | struct ip6t_entry *e |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 607 | = (struct ip6t_entry *)(entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
| 609 | if (!(valid_hooks & (1 << hook))) |
| 610 | continue; |
| 611 | |
| 612 | /* Set initial back pointer. */ |
| 613 | e->counters.pcnt = pos; |
| 614 | |
| 615 | for (;;) { |
| 616 | struct ip6t_standard_target *t |
| 617 | = (void *)ip6t_get_target(e); |
| 618 | |
| 619 | if (e->comefrom & (1 << NF_IP6_NUMHOOKS)) { |
| 620 | printk("iptables: loop hook %u pos %u %08X.\n", |
| 621 | hook, pos, e->comefrom); |
| 622 | return 0; |
| 623 | } |
| 624 | e->comefrom |
| 625 | |= ((1 << hook) | (1 << NF_IP6_NUMHOOKS)); |
| 626 | |
| 627 | /* Unconditional return/END. */ |
| 628 | if (e->target_offset == sizeof(struct ip6t_entry) |
| 629 | && (strcmp(t->target.u.user.name, |
| 630 | IP6T_STANDARD_TARGET) == 0) |
| 631 | && t->verdict < 0 |
| 632 | && unconditional(&e->ipv6)) { |
| 633 | unsigned int oldpos, size; |
| 634 | |
| 635 | /* Return: backtrack through the last |
| 636 | big jump. */ |
| 637 | do { |
| 638 | e->comefrom ^= (1<<NF_IP6_NUMHOOKS); |
| 639 | #ifdef DEBUG_IP_FIREWALL_USER |
| 640 | if (e->comefrom |
| 641 | & (1 << NF_IP6_NUMHOOKS)) { |
| 642 | duprintf("Back unset " |
| 643 | "on hook %u " |
| 644 | "rule %u\n", |
| 645 | hook, pos); |
| 646 | } |
| 647 | #endif |
| 648 | oldpos = pos; |
| 649 | pos = e->counters.pcnt; |
| 650 | e->counters.pcnt = 0; |
| 651 | |
| 652 | /* We're at the start. */ |
| 653 | if (pos == oldpos) |
| 654 | goto next; |
| 655 | |
| 656 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 657 | (entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | } while (oldpos == pos + e->next_offset); |
| 659 | |
| 660 | /* Move along one */ |
| 661 | size = e->next_offset; |
| 662 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 663 | (entry0 + pos + size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | e->counters.pcnt = pos; |
| 665 | pos += size; |
| 666 | } else { |
| 667 | int newpos = t->verdict; |
| 668 | |
| 669 | if (strcmp(t->target.u.user.name, |
| 670 | IP6T_STANDARD_TARGET) == 0 |
| 671 | && newpos >= 0) { |
| 672 | /* This a jump; chase it. */ |
| 673 | duprintf("Jump rule %u -> %u\n", |
| 674 | pos, newpos); |
| 675 | } else { |
| 676 | /* ... this is a fallthru */ |
| 677 | newpos = pos + e->next_offset; |
| 678 | } |
| 679 | e = (struct ip6t_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 680 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | e->counters.pcnt = pos; |
| 682 | pos = newpos; |
| 683 | } |
| 684 | } |
| 685 | next: |
| 686 | duprintf("Finished chain %u\n", hook); |
| 687 | } |
| 688 | return 1; |
| 689 | } |
| 690 | |
| 691 | static inline int |
| 692 | cleanup_match(struct ip6t_entry_match *m, unsigned int *i) |
| 693 | { |
| 694 | if (i && (*i)-- == 0) |
| 695 | return 1; |
| 696 | |
| 697 | if (m->u.kernel.match->destroy) |
| 698 | m->u.kernel.match->destroy(m->data, |
| 699 | m->u.match_size - sizeof(*m)); |
| 700 | module_put(m->u.kernel.match->me); |
| 701 | return 0; |
| 702 | } |
| 703 | |
| 704 | static inline int |
| 705 | standard_check(const struct ip6t_entry_target *t, |
| 706 | unsigned int max_offset) |
| 707 | { |
| 708 | struct ip6t_standard_target *targ = (void *)t; |
| 709 | |
| 710 | /* Check standard info. */ |
| 711 | if (t->u.target_size |
| 712 | != IP6T_ALIGN(sizeof(struct ip6t_standard_target))) { |
| 713 | duprintf("standard_check: target size %u != %u\n", |
| 714 | t->u.target_size, |
| 715 | IP6T_ALIGN(sizeof(struct ip6t_standard_target))); |
| 716 | return 0; |
| 717 | } |
| 718 | |
| 719 | if (targ->verdict >= 0 |
| 720 | && targ->verdict > max_offset - sizeof(struct ip6t_entry)) { |
| 721 | duprintf("ip6t_standard_check: bad verdict (%i)\n", |
| 722 | targ->verdict); |
| 723 | return 0; |
| 724 | } |
| 725 | |
| 726 | if (targ->verdict < -NF_MAX_VERDICT - 1) { |
| 727 | duprintf("ip6t_standard_check: bad negative verdict (%i)\n", |
| 728 | targ->verdict); |
| 729 | return 0; |
| 730 | } |
| 731 | return 1; |
| 732 | } |
| 733 | |
| 734 | static inline int |
| 735 | check_match(struct ip6t_entry_match *m, |
| 736 | const char *name, |
| 737 | const struct ip6t_ip6 *ipv6, |
| 738 | unsigned int hookmask, |
| 739 | unsigned int *i) |
| 740 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | struct ip6t_match *match; |
| 742 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 743 | match = try_then_request_module(find_match(m->u.user.name, |
| 744 | m->u.user.revision), |
| 745 | "ip6t_%s", m->u.user.name); |
| 746 | if (IS_ERR(match) || !match) { |
| 747 | duprintf("check_match: `%s' not found\n", m->u.user.name); |
| 748 | return match ? PTR_ERR(match) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | } |
| 750 | m->u.kernel.match = match; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
| 752 | if (m->u.kernel.match->checkentry |
| 753 | && !m->u.kernel.match->checkentry(name, ipv6, m->data, |
| 754 | m->u.match_size - sizeof(*m), |
| 755 | hookmask)) { |
| 756 | module_put(m->u.kernel.match->me); |
| 757 | duprintf("ip_tables: check failed for `%s'.\n", |
| 758 | m->u.kernel.match->name); |
| 759 | return -EINVAL; |
| 760 | } |
| 761 | |
| 762 | (*i)++; |
| 763 | return 0; |
| 764 | } |
| 765 | |
| 766 | static struct ip6t_target ip6t_standard_target; |
| 767 | |
| 768 | static inline int |
| 769 | check_entry(struct ip6t_entry *e, const char *name, unsigned int size, |
| 770 | unsigned int *i) |
| 771 | { |
| 772 | struct ip6t_entry_target *t; |
| 773 | struct ip6t_target *target; |
| 774 | int ret; |
| 775 | unsigned int j; |
| 776 | |
| 777 | if (!ip6_checkentry(&e->ipv6)) { |
| 778 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); |
| 779 | return -EINVAL; |
| 780 | } |
| 781 | |
| 782 | j = 0; |
| 783 | ret = IP6T_MATCH_ITERATE(e, check_match, name, &e->ipv6, e->comefrom, &j); |
| 784 | if (ret != 0) |
| 785 | goto cleanup_matches; |
| 786 | |
| 787 | t = ip6t_get_target(e); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 788 | target = try_then_request_module(find_target(t->u.user.name, |
| 789 | t->u.user.revision), |
| 790 | "ip6t_%s", t->u.user.name); |
| 791 | if (IS_ERR(target) || !target) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | duprintf("check_entry: `%s' not found\n", t->u.user.name); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 793 | ret = target ? PTR_ERR(target) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | goto cleanup_matches; |
| 795 | } |
| 796 | t->u.kernel.target = target; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | if (t->u.kernel.target == &ip6t_standard_target) { |
| 799 | if (!standard_check(t, size)) { |
| 800 | ret = -EINVAL; |
| 801 | goto cleanup_matches; |
| 802 | } |
| 803 | } else if (t->u.kernel.target->checkentry |
| 804 | && !t->u.kernel.target->checkentry(name, e, t->data, |
| 805 | t->u.target_size |
| 806 | - sizeof(*t), |
| 807 | e->comefrom)) { |
| 808 | module_put(t->u.kernel.target->me); |
| 809 | duprintf("ip_tables: check failed for `%s'.\n", |
| 810 | t->u.kernel.target->name); |
| 811 | ret = -EINVAL; |
| 812 | goto cleanup_matches; |
| 813 | } |
| 814 | |
| 815 | (*i)++; |
| 816 | return 0; |
| 817 | |
| 818 | cleanup_matches: |
| 819 | IP6T_MATCH_ITERATE(e, cleanup_match, &j); |
| 820 | return ret; |
| 821 | } |
| 822 | |
| 823 | static inline int |
| 824 | check_entry_size_and_hooks(struct ip6t_entry *e, |
| 825 | struct ip6t_table_info *newinfo, |
| 826 | unsigned char *base, |
| 827 | unsigned char *limit, |
| 828 | const unsigned int *hook_entries, |
| 829 | const unsigned int *underflows, |
| 830 | unsigned int *i) |
| 831 | { |
| 832 | unsigned int h; |
| 833 | |
| 834 | if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 |
| 835 | || (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) { |
| 836 | duprintf("Bad offset %p\n", e); |
| 837 | return -EINVAL; |
| 838 | } |
| 839 | |
| 840 | if (e->next_offset |
| 841 | < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) { |
| 842 | duprintf("checking: element %p size %u\n", |
| 843 | e, e->next_offset); |
| 844 | return -EINVAL; |
| 845 | } |
| 846 | |
| 847 | /* Check hooks & underflows */ |
| 848 | for (h = 0; h < NF_IP6_NUMHOOKS; h++) { |
| 849 | if ((unsigned char *)e - base == hook_entries[h]) |
| 850 | newinfo->hook_entry[h] = hook_entries[h]; |
| 851 | if ((unsigned char *)e - base == underflows[h]) |
| 852 | newinfo->underflow[h] = underflows[h]; |
| 853 | } |
| 854 | |
| 855 | /* FIXME: underflows must be unconditional, standard verdicts |
| 856 | < 0 (not IP6T_RETURN). --RR */ |
| 857 | |
| 858 | /* Clear counters and comefrom */ |
| 859 | e->counters = ((struct ip6t_counters) { 0, 0 }); |
| 860 | e->comefrom = 0; |
| 861 | |
| 862 | (*i)++; |
| 863 | return 0; |
| 864 | } |
| 865 | |
| 866 | static inline int |
| 867 | cleanup_entry(struct ip6t_entry *e, unsigned int *i) |
| 868 | { |
| 869 | struct ip6t_entry_target *t; |
| 870 | |
| 871 | if (i && (*i)-- == 0) |
| 872 | return 1; |
| 873 | |
| 874 | /* Cleanup all matches */ |
| 875 | IP6T_MATCH_ITERATE(e, cleanup_match, NULL); |
| 876 | t = ip6t_get_target(e); |
| 877 | if (t->u.kernel.target->destroy) |
| 878 | t->u.kernel.target->destroy(t->data, |
| 879 | t->u.target_size - sizeof(*t)); |
| 880 | module_put(t->u.kernel.target->me); |
| 881 | return 0; |
| 882 | } |
| 883 | |
| 884 | /* Checks and translates the user-supplied table segment (held in |
| 885 | newinfo) */ |
| 886 | static int |
| 887 | translate_table(const char *name, |
| 888 | unsigned int valid_hooks, |
| 889 | struct ip6t_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 890 | void *entry0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | unsigned int size, |
| 892 | unsigned int number, |
| 893 | const unsigned int *hook_entries, |
| 894 | const unsigned int *underflows) |
| 895 | { |
| 896 | unsigned int i; |
| 897 | int ret; |
| 898 | |
| 899 | newinfo->size = size; |
| 900 | newinfo->number = number; |
| 901 | |
| 902 | /* Init all hooks to impossible value. */ |
| 903 | for (i = 0; i < NF_IP6_NUMHOOKS; i++) { |
| 904 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
| 905 | newinfo->underflow[i] = 0xFFFFFFFF; |
| 906 | } |
| 907 | |
| 908 | duprintf("translate_table: size %u\n", newinfo->size); |
| 909 | i = 0; |
| 910 | /* Walk through entries, checking offsets. */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 911 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | check_entry_size_and_hooks, |
| 913 | newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 914 | entry0, |
| 915 | entry0 + size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | hook_entries, underflows, &i); |
| 917 | if (ret != 0) |
| 918 | return ret; |
| 919 | |
| 920 | if (i != number) { |
| 921 | duprintf("translate_table: %u not %u entries\n", |
| 922 | i, number); |
| 923 | return -EINVAL; |
| 924 | } |
| 925 | |
| 926 | /* Check hooks all assigned */ |
| 927 | for (i = 0; i < NF_IP6_NUMHOOKS; i++) { |
| 928 | /* Only hooks which are valid */ |
| 929 | if (!(valid_hooks & (1 << i))) |
| 930 | continue; |
| 931 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { |
| 932 | duprintf("Invalid hook entry %u %u\n", |
| 933 | i, hook_entries[i]); |
| 934 | return -EINVAL; |
| 935 | } |
| 936 | if (newinfo->underflow[i] == 0xFFFFFFFF) { |
| 937 | duprintf("Invalid underflow %u %u\n", |
| 938 | i, underflows[i]); |
| 939 | return -EINVAL; |
| 940 | } |
| 941 | } |
| 942 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 943 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | return -ELOOP; |
| 945 | |
| 946 | /* Finally, each sanity check must pass */ |
| 947 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 948 | ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | check_entry, name, size, &i); |
| 950 | |
| 951 | if (ret != 0) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 952 | IP6T_ENTRY_ITERATE(entry0, newinfo->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | cleanup_entry, &i); |
| 954 | return ret; |
| 955 | } |
| 956 | |
| 957 | /* And one copy for every other CPU */ |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 958 | for_each_cpu(i) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 959 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
| 960 | memcpy(newinfo->entries[i], entry0, newinfo->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | } |
| 962 | |
| 963 | return ret; |
| 964 | } |
| 965 | |
| 966 | static struct ip6t_table_info * |
| 967 | replace_table(struct ip6t_table *table, |
| 968 | unsigned int num_counters, |
| 969 | struct ip6t_table_info *newinfo, |
| 970 | int *error) |
| 971 | { |
| 972 | struct ip6t_table_info *oldinfo; |
| 973 | |
| 974 | #ifdef CONFIG_NETFILTER_DEBUG |
| 975 | { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 976 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 978 | for_each_cpu(cpu) { |
| 979 | struct ip6t_entry *table_base = newinfo->entries[cpu]; |
| 980 | if (table_base) |
| 981 | table_base->comefrom = 0xdead57ac; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | } |
| 983 | } |
| 984 | #endif |
| 985 | |
| 986 | /* Do the substitution. */ |
| 987 | write_lock_bh(&table->lock); |
| 988 | /* Check inside lock: is the old number correct? */ |
| 989 | if (num_counters != table->private->number) { |
| 990 | duprintf("num_counters != table->private->number (%u/%u)\n", |
| 991 | num_counters, table->private->number); |
| 992 | write_unlock_bh(&table->lock); |
| 993 | *error = -EAGAIN; |
| 994 | return NULL; |
| 995 | } |
| 996 | oldinfo = table->private; |
| 997 | table->private = newinfo; |
| 998 | newinfo->initial_entries = oldinfo->initial_entries; |
| 999 | write_unlock_bh(&table->lock); |
| 1000 | |
| 1001 | return oldinfo; |
| 1002 | } |
| 1003 | |
| 1004 | /* Gets counters. */ |
| 1005 | static inline int |
| 1006 | add_entry_to_counter(const struct ip6t_entry *e, |
| 1007 | struct ip6t_counters total[], |
| 1008 | unsigned int *i) |
| 1009 | { |
| 1010 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); |
| 1011 | |
| 1012 | (*i)++; |
| 1013 | return 0; |
| 1014 | } |
| 1015 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1016 | static inline int |
| 1017 | set_entry_to_counter(const struct ip6t_entry *e, |
| 1018 | struct ip6t_counters total[], |
| 1019 | unsigned int *i) |
| 1020 | { |
| 1021 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); |
| 1022 | |
| 1023 | (*i)++; |
| 1024 | return 0; |
| 1025 | } |
| 1026 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | static void |
| 1028 | get_counters(const struct ip6t_table_info *t, |
| 1029 | struct ip6t_counters counters[]) |
| 1030 | { |
| 1031 | unsigned int cpu; |
| 1032 | unsigned int i; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1033 | unsigned int curcpu; |
| 1034 | |
| 1035 | /* Instead of clearing (by a previous call to memset()) |
| 1036 | * the counters and using adds, we set the counters |
| 1037 | * with data used by 'current' CPU |
| 1038 | * We dont care about preemption here. |
| 1039 | */ |
| 1040 | curcpu = raw_smp_processor_id(); |
| 1041 | |
| 1042 | i = 0; |
| 1043 | IP6T_ENTRY_ITERATE(t->entries[curcpu], |
| 1044 | t->size, |
| 1045 | set_entry_to_counter, |
| 1046 | counters, |
| 1047 | &i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 1049 | for_each_cpu(cpu) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1050 | if (cpu == curcpu) |
| 1051 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1053 | IP6T_ENTRY_ITERATE(t->entries[cpu], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | t->size, |
| 1055 | add_entry_to_counter, |
| 1056 | counters, |
| 1057 | &i); |
| 1058 | } |
| 1059 | } |
| 1060 | |
| 1061 | static int |
| 1062 | copy_entries_to_user(unsigned int total_size, |
| 1063 | struct ip6t_table *table, |
| 1064 | void __user *userptr) |
| 1065 | { |
| 1066 | unsigned int off, num, countersize; |
| 1067 | struct ip6t_entry *e; |
| 1068 | struct ip6t_counters *counters; |
| 1069 | int ret = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1070 | void *loc_cpu_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | |
| 1072 | /* We need atomic snapshot of counters: rest doesn't change |
| 1073 | (other than comefrom, which userspace doesn't care |
| 1074 | about). */ |
| 1075 | countersize = sizeof(struct ip6t_counters) * table->private->number; |
| 1076 | counters = vmalloc(countersize); |
| 1077 | |
| 1078 | if (counters == NULL) |
| 1079 | return -ENOMEM; |
| 1080 | |
| 1081 | /* First, sum counters... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | write_lock_bh(&table->lock); |
| 1083 | get_counters(table->private, counters); |
| 1084 | write_unlock_bh(&table->lock); |
| 1085 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1086 | /* choose the copy that is on ourc node/cpu */ |
| 1087 | loc_cpu_entry = table->private->entries[raw_smp_processor_id()]; |
| 1088 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | ret = -EFAULT; |
| 1090 | goto free_counters; |
| 1091 | } |
| 1092 | |
| 1093 | /* FIXME: use iterator macros --RR */ |
| 1094 | /* ... then go back and fix counters and names */ |
| 1095 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ |
| 1096 | unsigned int i; |
| 1097 | struct ip6t_entry_match *m; |
| 1098 | struct ip6t_entry_target *t; |
| 1099 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1100 | e = (struct ip6t_entry *)(loc_cpu_entry + off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | if (copy_to_user(userptr + off |
| 1102 | + offsetof(struct ip6t_entry, counters), |
| 1103 | &counters[num], |
| 1104 | sizeof(counters[num])) != 0) { |
| 1105 | ret = -EFAULT; |
| 1106 | goto free_counters; |
| 1107 | } |
| 1108 | |
| 1109 | for (i = sizeof(struct ip6t_entry); |
| 1110 | i < e->target_offset; |
| 1111 | i += m->u.match_size) { |
| 1112 | m = (void *)e + i; |
| 1113 | |
| 1114 | if (copy_to_user(userptr + off + i |
| 1115 | + offsetof(struct ip6t_entry_match, |
| 1116 | u.user.name), |
| 1117 | m->u.kernel.match->name, |
| 1118 | strlen(m->u.kernel.match->name)+1) |
| 1119 | != 0) { |
| 1120 | ret = -EFAULT; |
| 1121 | goto free_counters; |
| 1122 | } |
| 1123 | } |
| 1124 | |
| 1125 | t = ip6t_get_target(e); |
| 1126 | if (copy_to_user(userptr + off + e->target_offset |
| 1127 | + offsetof(struct ip6t_entry_target, |
| 1128 | u.user.name), |
| 1129 | t->u.kernel.target->name, |
| 1130 | strlen(t->u.kernel.target->name)+1) != 0) { |
| 1131 | ret = -EFAULT; |
| 1132 | goto free_counters; |
| 1133 | } |
| 1134 | } |
| 1135 | |
| 1136 | free_counters: |
| 1137 | vfree(counters); |
| 1138 | return ret; |
| 1139 | } |
| 1140 | |
| 1141 | static int |
| 1142 | get_entries(const struct ip6t_get_entries *entries, |
| 1143 | struct ip6t_get_entries __user *uptr) |
| 1144 | { |
| 1145 | int ret; |
| 1146 | struct ip6t_table *t; |
| 1147 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1148 | t = find_table_lock(entries->name); |
| 1149 | if (t && !IS_ERR(t)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | duprintf("t->private->number = %u\n", |
| 1151 | t->private->number); |
| 1152 | if (entries->size == t->private->size) |
| 1153 | ret = copy_entries_to_user(t->private->size, |
| 1154 | t, uptr->entrytable); |
| 1155 | else { |
| 1156 | duprintf("get_entries: I've got %u not %u!\n", |
| 1157 | t->private->size, |
| 1158 | entries->size); |
| 1159 | ret = -EINVAL; |
| 1160 | } |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1161 | module_put(t->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | up(&ip6t_mutex); |
| 1163 | } else |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1164 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | |
| 1166 | return ret; |
| 1167 | } |
| 1168 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1169 | static void free_table_info(struct ip6t_table_info *info) |
| 1170 | { |
| 1171 | int cpu; |
| 1172 | for_each_cpu(cpu) { |
| 1173 | if (info->size <= PAGE_SIZE) |
| 1174 | kfree(info->entries[cpu]); |
| 1175 | else |
| 1176 | vfree(info->entries[cpu]); |
| 1177 | } |
| 1178 | kfree(info); |
| 1179 | } |
| 1180 | |
| 1181 | static struct ip6t_table_info *alloc_table_info(unsigned int size) |
| 1182 | { |
| 1183 | struct ip6t_table_info *newinfo; |
| 1184 | int cpu; |
| 1185 | |
| 1186 | newinfo = kzalloc(sizeof(struct ip6t_table_info), GFP_KERNEL); |
| 1187 | if (!newinfo) |
| 1188 | return NULL; |
| 1189 | |
| 1190 | newinfo->size = size; |
| 1191 | |
| 1192 | for_each_cpu(cpu) { |
| 1193 | if (size <= PAGE_SIZE) |
| 1194 | newinfo->entries[cpu] = kmalloc_node(size, |
| 1195 | GFP_KERNEL, |
| 1196 | cpu_to_node(cpu)); |
| 1197 | else |
| 1198 | newinfo->entries[cpu] = vmalloc_node(size, |
| 1199 | cpu_to_node(cpu)); |
| 1200 | if (newinfo->entries[cpu] == NULL) { |
| 1201 | free_table_info(newinfo); |
| 1202 | return NULL; |
| 1203 | } |
| 1204 | } |
| 1205 | |
| 1206 | return newinfo; |
| 1207 | } |
| 1208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | static int |
| 1210 | do_replace(void __user *user, unsigned int len) |
| 1211 | { |
| 1212 | int ret; |
| 1213 | struct ip6t_replace tmp; |
| 1214 | struct ip6t_table *t; |
| 1215 | struct ip6t_table_info *newinfo, *oldinfo; |
| 1216 | struct ip6t_counters *counters; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1217 | void *loc_cpu_entry, *loc_cpu_old_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | |
| 1219 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1220 | return -EFAULT; |
| 1221 | |
| 1222 | /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */ |
| 1223 | if ((SMP_ALIGN(tmp.size) >> PAGE_SHIFT) + 2 > num_physpages) |
| 1224 | return -ENOMEM; |
| 1225 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1226 | newinfo = alloc_table_info(tmp.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | if (!newinfo) |
| 1228 | return -ENOMEM; |
| 1229 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1230 | /* choose the copy that is on our node/cpu */ |
| 1231 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 1232 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | tmp.size) != 0) { |
| 1234 | ret = -EFAULT; |
| 1235 | goto free_newinfo; |
| 1236 | } |
| 1237 | |
| 1238 | counters = vmalloc(tmp.num_counters * sizeof(struct ip6t_counters)); |
| 1239 | if (!counters) { |
| 1240 | ret = -ENOMEM; |
| 1241 | goto free_newinfo; |
| 1242 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | |
| 1244 | ret = translate_table(tmp.name, tmp.valid_hooks, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1245 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | tmp.hook_entry, tmp.underflow); |
| 1247 | if (ret != 0) |
| 1248 | goto free_newinfo_counters; |
| 1249 | |
| 1250 | duprintf("ip_tables: Translated table\n"); |
| 1251 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1252 | t = try_then_request_module(find_table_lock(tmp.name), |
| 1253 | "ip6table_%s", tmp.name); |
| 1254 | if (!t || IS_ERR(t)) { |
| 1255 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | goto free_newinfo_counters_untrans; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1257 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | |
| 1259 | /* You lied! */ |
| 1260 | if (tmp.valid_hooks != t->valid_hooks) { |
| 1261 | duprintf("Valid hook crap: %08X vs %08X\n", |
| 1262 | tmp.valid_hooks, t->valid_hooks); |
| 1263 | ret = -EINVAL; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1264 | goto put_module; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | } |
| 1266 | |
| 1267 | oldinfo = replace_table(t, tmp.num_counters, newinfo, &ret); |
| 1268 | if (!oldinfo) |
| 1269 | goto put_module; |
| 1270 | |
| 1271 | /* Update module usage count based on number of rules */ |
| 1272 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", |
| 1273 | oldinfo->number, oldinfo->initial_entries, newinfo->number); |
| 1274 | if ((oldinfo->number > oldinfo->initial_entries) || |
| 1275 | (newinfo->number <= oldinfo->initial_entries)) |
| 1276 | module_put(t->me); |
| 1277 | if ((oldinfo->number > oldinfo->initial_entries) && |
| 1278 | (newinfo->number <= oldinfo->initial_entries)) |
| 1279 | module_put(t->me); |
| 1280 | |
| 1281 | /* Get the old counters. */ |
| 1282 | get_counters(oldinfo, counters); |
| 1283 | /* Decrease module usage counts and free resource */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1284 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
| 1285 | IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); |
| 1286 | free_table_info(oldinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | if (copy_to_user(tmp.counters, counters, |
| 1288 | sizeof(struct ip6t_counters) * tmp.num_counters) != 0) |
| 1289 | ret = -EFAULT; |
| 1290 | vfree(counters); |
| 1291 | up(&ip6t_mutex); |
| 1292 | return ret; |
| 1293 | |
| 1294 | put_module: |
| 1295 | module_put(t->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | up(&ip6t_mutex); |
| 1297 | free_newinfo_counters_untrans: |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1298 | IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | free_newinfo_counters: |
| 1300 | vfree(counters); |
| 1301 | free_newinfo: |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1302 | free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | return ret; |
| 1304 | } |
| 1305 | |
| 1306 | /* We're lazy, and add to the first CPU; overflow works its fey magic |
| 1307 | * and everything is OK. */ |
| 1308 | static inline int |
| 1309 | add_counter_to_entry(struct ip6t_entry *e, |
| 1310 | const struct ip6t_counters addme[], |
| 1311 | unsigned int *i) |
| 1312 | { |
| 1313 | #if 0 |
| 1314 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", |
| 1315 | *i, |
| 1316 | (long unsigned int)e->counters.pcnt, |
| 1317 | (long unsigned int)e->counters.bcnt, |
| 1318 | (long unsigned int)addme[*i].pcnt, |
| 1319 | (long unsigned int)addme[*i].bcnt); |
| 1320 | #endif |
| 1321 | |
| 1322 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); |
| 1323 | |
| 1324 | (*i)++; |
| 1325 | return 0; |
| 1326 | } |
| 1327 | |
| 1328 | static int |
| 1329 | do_add_counters(void __user *user, unsigned int len) |
| 1330 | { |
| 1331 | unsigned int i; |
| 1332 | struct ip6t_counters_info tmp, *paddc; |
| 1333 | struct ip6t_table *t; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1334 | int ret = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1335 | void *loc_cpu_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | |
| 1337 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1338 | return -EFAULT; |
| 1339 | |
| 1340 | if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct ip6t_counters)) |
| 1341 | return -EINVAL; |
| 1342 | |
| 1343 | paddc = vmalloc(len); |
| 1344 | if (!paddc) |
| 1345 | return -ENOMEM; |
| 1346 | |
| 1347 | if (copy_from_user(paddc, user, len) != 0) { |
| 1348 | ret = -EFAULT; |
| 1349 | goto free; |
| 1350 | } |
| 1351 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1352 | t = find_table_lock(tmp.name); |
| 1353 | if (!t || IS_ERR(t)) { |
| 1354 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | goto free; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1356 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | |
| 1358 | write_lock_bh(&t->lock); |
| 1359 | if (t->private->number != paddc->num_counters) { |
| 1360 | ret = -EINVAL; |
| 1361 | goto unlock_up_free; |
| 1362 | } |
| 1363 | |
| 1364 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1365 | /* Choose the copy that is on our node */ |
| 1366 | loc_cpu_entry = t->private->entries[smp_processor_id()]; |
| 1367 | IP6T_ENTRY_ITERATE(loc_cpu_entry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | t->private->size, |
| 1369 | add_counter_to_entry, |
| 1370 | paddc->counters, |
| 1371 | &i); |
| 1372 | unlock_up_free: |
| 1373 | write_unlock_bh(&t->lock); |
| 1374 | up(&ip6t_mutex); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1375 | module_put(t->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | free: |
| 1377 | vfree(paddc); |
| 1378 | |
| 1379 | return ret; |
| 1380 | } |
| 1381 | |
| 1382 | static int |
| 1383 | do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
| 1384 | { |
| 1385 | int ret; |
| 1386 | |
| 1387 | if (!capable(CAP_NET_ADMIN)) |
| 1388 | return -EPERM; |
| 1389 | |
| 1390 | switch (cmd) { |
| 1391 | case IP6T_SO_SET_REPLACE: |
| 1392 | ret = do_replace(user, len); |
| 1393 | break; |
| 1394 | |
| 1395 | case IP6T_SO_SET_ADD_COUNTERS: |
| 1396 | ret = do_add_counters(user, len); |
| 1397 | break; |
| 1398 | |
| 1399 | default: |
| 1400 | duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd); |
| 1401 | ret = -EINVAL; |
| 1402 | } |
| 1403 | |
| 1404 | return ret; |
| 1405 | } |
| 1406 | |
| 1407 | static int |
| 1408 | do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1409 | { |
| 1410 | int ret; |
| 1411 | |
| 1412 | if (!capable(CAP_NET_ADMIN)) |
| 1413 | return -EPERM; |
| 1414 | |
| 1415 | switch (cmd) { |
| 1416 | case IP6T_SO_GET_INFO: { |
| 1417 | char name[IP6T_TABLE_MAXNAMELEN]; |
| 1418 | struct ip6t_table *t; |
| 1419 | |
| 1420 | if (*len != sizeof(struct ip6t_getinfo)) { |
| 1421 | duprintf("length %u != %u\n", *len, |
| 1422 | sizeof(struct ip6t_getinfo)); |
| 1423 | ret = -EINVAL; |
| 1424 | break; |
| 1425 | } |
| 1426 | |
| 1427 | if (copy_from_user(name, user, sizeof(name)) != 0) { |
| 1428 | ret = -EFAULT; |
| 1429 | break; |
| 1430 | } |
| 1431 | name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1432 | |
| 1433 | t = try_then_request_module(find_table_lock(name), |
| 1434 | "ip6table_%s", name); |
| 1435 | if (t && !IS_ERR(t)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | struct ip6t_getinfo info; |
| 1437 | |
| 1438 | info.valid_hooks = t->valid_hooks; |
| 1439 | memcpy(info.hook_entry, t->private->hook_entry, |
| 1440 | sizeof(info.hook_entry)); |
| 1441 | memcpy(info.underflow, t->private->underflow, |
| 1442 | sizeof(info.underflow)); |
| 1443 | info.num_entries = t->private->number; |
| 1444 | info.size = t->private->size; |
| 1445 | memcpy(info.name, name, sizeof(info.name)); |
| 1446 | |
| 1447 | if (copy_to_user(user, &info, *len) != 0) |
| 1448 | ret = -EFAULT; |
| 1449 | else |
| 1450 | ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | up(&ip6t_mutex); |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1452 | module_put(t->me); |
| 1453 | } else |
| 1454 | ret = t ? PTR_ERR(t) : -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | } |
| 1456 | break; |
| 1457 | |
| 1458 | case IP6T_SO_GET_ENTRIES: { |
| 1459 | struct ip6t_get_entries get; |
| 1460 | |
| 1461 | if (*len < sizeof(get)) { |
| 1462 | duprintf("get_entries: %u < %u\n", *len, sizeof(get)); |
| 1463 | ret = -EINVAL; |
| 1464 | } else if (copy_from_user(&get, user, sizeof(get)) != 0) { |
| 1465 | ret = -EFAULT; |
| 1466 | } else if (*len != sizeof(struct ip6t_get_entries) + get.size) { |
| 1467 | duprintf("get_entries: %u != %u\n", *len, |
| 1468 | sizeof(struct ip6t_get_entries) + get.size); |
| 1469 | ret = -EINVAL; |
| 1470 | } else |
| 1471 | ret = get_entries(&get, user); |
| 1472 | break; |
| 1473 | } |
| 1474 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1475 | case IP6T_SO_GET_REVISION_MATCH: |
| 1476 | case IP6T_SO_GET_REVISION_TARGET: { |
| 1477 | struct ip6t_get_revision rev; |
| 1478 | int (*revfn)(const char *, u8, int *); |
| 1479 | |
| 1480 | if (*len != sizeof(rev)) { |
| 1481 | ret = -EINVAL; |
| 1482 | break; |
| 1483 | } |
| 1484 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { |
| 1485 | ret = -EFAULT; |
| 1486 | break; |
| 1487 | } |
| 1488 | |
| 1489 | if (cmd == IP6T_SO_GET_REVISION_TARGET) |
| 1490 | revfn = target_revfn; |
| 1491 | else |
| 1492 | revfn = match_revfn; |
| 1493 | |
| 1494 | try_then_request_module(find_revision(rev.name, rev.revision, |
| 1495 | revfn, &ret), |
| 1496 | "ip6t_%s", rev.name); |
| 1497 | break; |
| 1498 | } |
| 1499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | default: |
| 1501 | duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd); |
| 1502 | ret = -EINVAL; |
| 1503 | } |
| 1504 | |
| 1505 | return ret; |
| 1506 | } |
| 1507 | |
| 1508 | /* Registration hooks for targets. */ |
| 1509 | int |
| 1510 | ip6t_register_target(struct ip6t_target *target) |
| 1511 | { |
| 1512 | int ret; |
| 1513 | |
| 1514 | ret = down_interruptible(&ip6t_mutex); |
| 1515 | if (ret != 0) |
| 1516 | return ret; |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1517 | list_add(&target->list, &ip6t_target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | up(&ip6t_mutex); |
| 1519 | return ret; |
| 1520 | } |
| 1521 | |
| 1522 | void |
| 1523 | ip6t_unregister_target(struct ip6t_target *target) |
| 1524 | { |
| 1525 | down(&ip6t_mutex); |
| 1526 | LIST_DELETE(&ip6t_target, target); |
| 1527 | up(&ip6t_mutex); |
| 1528 | } |
| 1529 | |
| 1530 | int |
| 1531 | ip6t_register_match(struct ip6t_match *match) |
| 1532 | { |
| 1533 | int ret; |
| 1534 | |
| 1535 | ret = down_interruptible(&ip6t_mutex); |
| 1536 | if (ret != 0) |
| 1537 | return ret; |
| 1538 | |
Harald Welte | 6b7d31f | 2005-10-26 09:34:24 +0200 | [diff] [blame] | 1539 | list_add(&match->list, &ip6t_match); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | up(&ip6t_mutex); |
| 1541 | |
| 1542 | return ret; |
| 1543 | } |
| 1544 | |
| 1545 | void |
| 1546 | ip6t_unregister_match(struct ip6t_match *match) |
| 1547 | { |
| 1548 | down(&ip6t_mutex); |
| 1549 | LIST_DELETE(&ip6t_match, match); |
| 1550 | up(&ip6t_mutex); |
| 1551 | } |
| 1552 | |
| 1553 | int ip6t_register_table(struct ip6t_table *table, |
| 1554 | const struct ip6t_replace *repl) |
| 1555 | { |
| 1556 | int ret; |
| 1557 | struct ip6t_table_info *newinfo; |
| 1558 | static struct ip6t_table_info bootstrap |
| 1559 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1560 | void *loc_cpu_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1562 | newinfo = alloc_table_info(repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | if (!newinfo) |
| 1564 | return -ENOMEM; |
| 1565 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1566 | /* choose the copy on our node/cpu */ |
| 1567 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 1568 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | |
| 1570 | ret = translate_table(table->name, table->valid_hooks, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1571 | newinfo, loc_cpu_entry, repl->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | repl->num_entries, |
| 1573 | repl->hook_entry, |
| 1574 | repl->underflow); |
| 1575 | if (ret != 0) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1576 | free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | return ret; |
| 1578 | } |
| 1579 | |
| 1580 | ret = down_interruptible(&ip6t_mutex); |
| 1581 | if (ret != 0) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1582 | free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | return ret; |
| 1584 | } |
| 1585 | |
| 1586 | /* Don't autoload: we'd eat our tail... */ |
| 1587 | if (list_named_find(&ip6t_tables, table->name)) { |
| 1588 | ret = -EEXIST; |
| 1589 | goto free_unlock; |
| 1590 | } |
| 1591 | |
| 1592 | /* Simplifies replace_table code. */ |
| 1593 | table->private = &bootstrap; |
| 1594 | if (!replace_table(table, 0, newinfo, &ret)) |
| 1595 | goto free_unlock; |
| 1596 | |
| 1597 | duprintf("table->private->number = %u\n", |
| 1598 | table->private->number); |
| 1599 | |
| 1600 | /* save number of initial entries */ |
| 1601 | table->private->initial_entries = table->private->number; |
| 1602 | |
| 1603 | rwlock_init(&table->lock); |
| 1604 | list_prepend(&ip6t_tables, table); |
| 1605 | |
| 1606 | unlock: |
| 1607 | up(&ip6t_mutex); |
| 1608 | return ret; |
| 1609 | |
| 1610 | free_unlock: |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1611 | free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | goto unlock; |
| 1613 | } |
| 1614 | |
| 1615 | void ip6t_unregister_table(struct ip6t_table *table) |
| 1616 | { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1617 | void *loc_cpu_entry; |
| 1618 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | down(&ip6t_mutex); |
| 1620 | LIST_DELETE(&ip6t_tables, table); |
| 1621 | up(&ip6t_mutex); |
| 1622 | |
| 1623 | /* Decrease module usage counts and free resources */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1624 | loc_cpu_entry = table->private->entries[raw_smp_processor_id()]; |
| 1625 | IP6T_ENTRY_ITERATE(loc_cpu_entry, table->private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | cleanup_entry, NULL); |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1627 | free_table_info(table->private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | } |
| 1629 | |
| 1630 | /* Returns 1 if the port is matched by the range, 0 otherwise */ |
| 1631 | static inline int |
| 1632 | port_match(u_int16_t min, u_int16_t max, u_int16_t port, int invert) |
| 1633 | { |
| 1634 | int ret; |
| 1635 | |
| 1636 | ret = (port >= min && port <= max) ^ invert; |
| 1637 | return ret; |
| 1638 | } |
| 1639 | |
| 1640 | static int |
| 1641 | tcp_find_option(u_int8_t option, |
| 1642 | const struct sk_buff *skb, |
| 1643 | unsigned int tcpoff, |
| 1644 | unsigned int optlen, |
| 1645 | int invert, |
| 1646 | int *hotdrop) |
| 1647 | { |
| 1648 | /* tcp.doff is only 4 bits, ie. max 15 * 4 bytes */ |
| 1649 | u_int8_t _opt[60 - sizeof(struct tcphdr)], *op; |
| 1650 | unsigned int i; |
| 1651 | |
| 1652 | duprintf("tcp_match: finding option\n"); |
| 1653 | if (!optlen) |
| 1654 | return invert; |
| 1655 | /* If we don't have the whole header, drop packet. */ |
| 1656 | op = skb_header_pointer(skb, tcpoff + sizeof(struct tcphdr), optlen, |
| 1657 | _opt); |
| 1658 | if (op == NULL) { |
| 1659 | *hotdrop = 1; |
| 1660 | return 0; |
| 1661 | } |
| 1662 | |
| 1663 | for (i = 0; i < optlen; ) { |
| 1664 | if (op[i] == option) return !invert; |
| 1665 | if (op[i] < 2) i++; |
| 1666 | else i += op[i+1]?:1; |
| 1667 | } |
| 1668 | |
| 1669 | return invert; |
| 1670 | } |
| 1671 | |
| 1672 | static int |
| 1673 | tcp_match(const struct sk_buff *skb, |
| 1674 | const struct net_device *in, |
| 1675 | const struct net_device *out, |
| 1676 | const void *matchinfo, |
| 1677 | int offset, |
| 1678 | unsigned int protoff, |
| 1679 | int *hotdrop) |
| 1680 | { |
| 1681 | struct tcphdr _tcph, *th; |
| 1682 | const struct ip6t_tcp *tcpinfo = matchinfo; |
| 1683 | |
| 1684 | if (offset) { |
| 1685 | /* To quote Alan: |
| 1686 | |
| 1687 | Don't allow a fragment of TCP 8 bytes in. Nobody normal |
| 1688 | causes this. Its a cracker trying to break in by doing a |
| 1689 | flag overwrite to pass the direction checks. |
| 1690 | */ |
| 1691 | if (offset == 1) { |
| 1692 | duprintf("Dropping evil TCP offset=1 frag.\n"); |
| 1693 | *hotdrop = 1; |
| 1694 | } |
| 1695 | /* Must not be a fragment. */ |
| 1696 | return 0; |
| 1697 | } |
| 1698 | |
| 1699 | #define FWINVTCP(bool,invflg) ((bool) ^ !!(tcpinfo->invflags & invflg)) |
| 1700 | |
| 1701 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
| 1702 | if (th == NULL) { |
| 1703 | /* We've been asked to examine this packet, and we |
| 1704 | can't. Hence, no choice but to drop. */ |
| 1705 | duprintf("Dropping evil TCP offset=0 tinygram.\n"); |
| 1706 | *hotdrop = 1; |
| 1707 | return 0; |
| 1708 | } |
| 1709 | |
| 1710 | if (!port_match(tcpinfo->spts[0], tcpinfo->spts[1], |
| 1711 | ntohs(th->source), |
| 1712 | !!(tcpinfo->invflags & IP6T_TCP_INV_SRCPT))) |
| 1713 | return 0; |
| 1714 | if (!port_match(tcpinfo->dpts[0], tcpinfo->dpts[1], |
| 1715 | ntohs(th->dest), |
| 1716 | !!(tcpinfo->invflags & IP6T_TCP_INV_DSTPT))) |
| 1717 | return 0; |
| 1718 | if (!FWINVTCP((((unsigned char *)th)[13] & tcpinfo->flg_mask) |
| 1719 | == tcpinfo->flg_cmp, |
| 1720 | IP6T_TCP_INV_FLAGS)) |
| 1721 | return 0; |
| 1722 | if (tcpinfo->option) { |
| 1723 | if (th->doff * 4 < sizeof(_tcph)) { |
| 1724 | *hotdrop = 1; |
| 1725 | return 0; |
| 1726 | } |
| 1727 | if (!tcp_find_option(tcpinfo->option, skb, protoff, |
| 1728 | th->doff*4 - sizeof(*th), |
| 1729 | tcpinfo->invflags & IP6T_TCP_INV_OPTION, |
| 1730 | hotdrop)) |
| 1731 | return 0; |
| 1732 | } |
| 1733 | return 1; |
| 1734 | } |
| 1735 | |
| 1736 | /* Called when user tries to insert an entry of this type. */ |
| 1737 | static int |
| 1738 | tcp_checkentry(const char *tablename, |
| 1739 | const struct ip6t_ip6 *ipv6, |
| 1740 | void *matchinfo, |
| 1741 | unsigned int matchsize, |
| 1742 | unsigned int hook_mask) |
| 1743 | { |
| 1744 | const struct ip6t_tcp *tcpinfo = matchinfo; |
| 1745 | |
| 1746 | /* Must specify proto == TCP, and no unknown invflags */ |
| 1747 | return ipv6->proto == IPPROTO_TCP |
| 1748 | && !(ipv6->invflags & IP6T_INV_PROTO) |
| 1749 | && matchsize == IP6T_ALIGN(sizeof(struct ip6t_tcp)) |
| 1750 | && !(tcpinfo->invflags & ~IP6T_TCP_INV_MASK); |
| 1751 | } |
| 1752 | |
| 1753 | static int |
| 1754 | udp_match(const struct sk_buff *skb, |
| 1755 | const struct net_device *in, |
| 1756 | const struct net_device *out, |
| 1757 | const void *matchinfo, |
| 1758 | int offset, |
| 1759 | unsigned int protoff, |
| 1760 | int *hotdrop) |
| 1761 | { |
| 1762 | struct udphdr _udph, *uh; |
| 1763 | const struct ip6t_udp *udpinfo = matchinfo; |
| 1764 | |
| 1765 | /* Must not be a fragment. */ |
| 1766 | if (offset) |
| 1767 | return 0; |
| 1768 | |
| 1769 | uh = skb_header_pointer(skb, protoff, sizeof(_udph), &_udph); |
| 1770 | if (uh == NULL) { |
| 1771 | /* We've been asked to examine this packet, and we |
| 1772 | can't. Hence, no choice but to drop. */ |
| 1773 | duprintf("Dropping evil UDP tinygram.\n"); |
| 1774 | *hotdrop = 1; |
| 1775 | return 0; |
| 1776 | } |
| 1777 | |
| 1778 | return port_match(udpinfo->spts[0], udpinfo->spts[1], |
| 1779 | ntohs(uh->source), |
| 1780 | !!(udpinfo->invflags & IP6T_UDP_INV_SRCPT)) |
| 1781 | && port_match(udpinfo->dpts[0], udpinfo->dpts[1], |
| 1782 | ntohs(uh->dest), |
| 1783 | !!(udpinfo->invflags & IP6T_UDP_INV_DSTPT)); |
| 1784 | } |
| 1785 | |
| 1786 | /* Called when user tries to insert an entry of this type. */ |
| 1787 | static int |
| 1788 | udp_checkentry(const char *tablename, |
| 1789 | const struct ip6t_ip6 *ipv6, |
| 1790 | void *matchinfo, |
| 1791 | unsigned int matchinfosize, |
| 1792 | unsigned int hook_mask) |
| 1793 | { |
| 1794 | const struct ip6t_udp *udpinfo = matchinfo; |
| 1795 | |
| 1796 | /* Must specify proto == UDP, and no unknown invflags */ |
| 1797 | if (ipv6->proto != IPPROTO_UDP || (ipv6->invflags & IP6T_INV_PROTO)) { |
| 1798 | duprintf("ip6t_udp: Protocol %u != %u\n", ipv6->proto, |
| 1799 | IPPROTO_UDP); |
| 1800 | return 0; |
| 1801 | } |
| 1802 | if (matchinfosize != IP6T_ALIGN(sizeof(struct ip6t_udp))) { |
| 1803 | duprintf("ip6t_udp: matchsize %u != %u\n", |
| 1804 | matchinfosize, IP6T_ALIGN(sizeof(struct ip6t_udp))); |
| 1805 | return 0; |
| 1806 | } |
| 1807 | if (udpinfo->invflags & ~IP6T_UDP_INV_MASK) { |
| 1808 | duprintf("ip6t_udp: unknown flags %X\n", |
| 1809 | udpinfo->invflags); |
| 1810 | return 0; |
| 1811 | } |
| 1812 | |
| 1813 | return 1; |
| 1814 | } |
| 1815 | |
| 1816 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ |
| 1817 | static inline int |
| 1818 | icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
| 1819 | u_int8_t type, u_int8_t code, |
| 1820 | int invert) |
| 1821 | { |
| 1822 | return (type == test_type && code >= min_code && code <= max_code) |
| 1823 | ^ invert; |
| 1824 | } |
| 1825 | |
| 1826 | static int |
| 1827 | icmp6_match(const struct sk_buff *skb, |
| 1828 | const struct net_device *in, |
| 1829 | const struct net_device *out, |
| 1830 | const void *matchinfo, |
| 1831 | int offset, |
| 1832 | unsigned int protoff, |
| 1833 | int *hotdrop) |
| 1834 | { |
| 1835 | struct icmp6hdr _icmp, *ic; |
| 1836 | const struct ip6t_icmp *icmpinfo = matchinfo; |
| 1837 | |
| 1838 | /* Must not be a fragment. */ |
| 1839 | if (offset) |
| 1840 | return 0; |
| 1841 | |
| 1842 | ic = skb_header_pointer(skb, protoff, sizeof(_icmp), &_icmp); |
| 1843 | if (ic == NULL) { |
| 1844 | /* We've been asked to examine this packet, and we |
| 1845 | can't. Hence, no choice but to drop. */ |
| 1846 | duprintf("Dropping evil ICMP tinygram.\n"); |
| 1847 | *hotdrop = 1; |
| 1848 | return 0; |
| 1849 | } |
| 1850 | |
| 1851 | return icmp6_type_code_match(icmpinfo->type, |
| 1852 | icmpinfo->code[0], |
| 1853 | icmpinfo->code[1], |
| 1854 | ic->icmp6_type, ic->icmp6_code, |
| 1855 | !!(icmpinfo->invflags&IP6T_ICMP_INV)); |
| 1856 | } |
| 1857 | |
| 1858 | /* Called when user tries to insert an entry of this type. */ |
| 1859 | static int |
| 1860 | icmp6_checkentry(const char *tablename, |
| 1861 | const struct ip6t_ip6 *ipv6, |
| 1862 | void *matchinfo, |
| 1863 | unsigned int matchsize, |
| 1864 | unsigned int hook_mask) |
| 1865 | { |
| 1866 | const struct ip6t_icmp *icmpinfo = matchinfo; |
| 1867 | |
| 1868 | /* Must specify proto == ICMP, and no unknown invflags */ |
| 1869 | return ipv6->proto == IPPROTO_ICMPV6 |
| 1870 | && !(ipv6->invflags & IP6T_INV_PROTO) |
| 1871 | && matchsize == IP6T_ALIGN(sizeof(struct ip6t_icmp)) |
| 1872 | && !(icmpinfo->invflags & ~IP6T_ICMP_INV); |
| 1873 | } |
| 1874 | |
| 1875 | /* The built-in targets: standard (NULL) and error. */ |
| 1876 | static struct ip6t_target ip6t_standard_target = { |
| 1877 | .name = IP6T_STANDARD_TARGET, |
| 1878 | }; |
| 1879 | |
| 1880 | static struct ip6t_target ip6t_error_target = { |
| 1881 | .name = IP6T_ERROR_TARGET, |
| 1882 | .target = ip6t_error, |
| 1883 | }; |
| 1884 | |
| 1885 | static struct nf_sockopt_ops ip6t_sockopts = { |
| 1886 | .pf = PF_INET6, |
| 1887 | .set_optmin = IP6T_BASE_CTL, |
| 1888 | .set_optmax = IP6T_SO_SET_MAX+1, |
| 1889 | .set = do_ip6t_set_ctl, |
| 1890 | .get_optmin = IP6T_BASE_CTL, |
| 1891 | .get_optmax = IP6T_SO_GET_MAX+1, |
| 1892 | .get = do_ip6t_get_ctl, |
| 1893 | }; |
| 1894 | |
| 1895 | static struct ip6t_match tcp_matchstruct = { |
| 1896 | .name = "tcp", |
| 1897 | .match = &tcp_match, |
| 1898 | .checkentry = &tcp_checkentry, |
| 1899 | }; |
| 1900 | |
| 1901 | static struct ip6t_match udp_matchstruct = { |
| 1902 | .name = "udp", |
| 1903 | .match = &udp_match, |
| 1904 | .checkentry = &udp_checkentry, |
| 1905 | }; |
| 1906 | |
| 1907 | static struct ip6t_match icmp6_matchstruct = { |
| 1908 | .name = "icmp6", |
| 1909 | .match = &icmp6_match, |
| 1910 | .checkentry = &icmp6_checkentry, |
| 1911 | }; |
| 1912 | |
| 1913 | #ifdef CONFIG_PROC_FS |
| 1914 | static inline int print_name(const char *i, |
| 1915 | off_t start_offset, char *buffer, int length, |
| 1916 | off_t *pos, unsigned int *count) |
| 1917 | { |
| 1918 | if ((*count)++ >= start_offset) { |
| 1919 | unsigned int namelen; |
| 1920 | |
| 1921 | namelen = sprintf(buffer + *pos, "%s\n", |
| 1922 | i + sizeof(struct list_head)); |
| 1923 | if (*pos + namelen > length) { |
| 1924 | /* Stop iterating */ |
| 1925 | return 1; |
| 1926 | } |
| 1927 | *pos += namelen; |
| 1928 | } |
| 1929 | return 0; |
| 1930 | } |
| 1931 | |
| 1932 | static inline int print_target(const struct ip6t_target *t, |
| 1933 | off_t start_offset, char *buffer, int length, |
| 1934 | off_t *pos, unsigned int *count) |
| 1935 | { |
| 1936 | if (t == &ip6t_standard_target || t == &ip6t_error_target) |
| 1937 | return 0; |
| 1938 | return print_name((char *)t, start_offset, buffer, length, pos, count); |
| 1939 | } |
| 1940 | |
| 1941 | static int ip6t_get_tables(char *buffer, char **start, off_t offset, int length) |
| 1942 | { |
| 1943 | off_t pos = 0; |
| 1944 | unsigned int count = 0; |
| 1945 | |
| 1946 | if (down_interruptible(&ip6t_mutex) != 0) |
| 1947 | return 0; |
| 1948 | |
| 1949 | LIST_FIND(&ip6t_tables, print_name, char *, |
| 1950 | offset, buffer, length, &pos, &count); |
| 1951 | |
| 1952 | up(&ip6t_mutex); |
| 1953 | |
| 1954 | /* `start' hack - see fs/proc/generic.c line ~105 */ |
| 1955 | *start=(char *)((unsigned long)count-offset); |
| 1956 | return pos; |
| 1957 | } |
| 1958 | |
| 1959 | static int ip6t_get_targets(char *buffer, char **start, off_t offset, int length) |
| 1960 | { |
| 1961 | off_t pos = 0; |
| 1962 | unsigned int count = 0; |
| 1963 | |
| 1964 | if (down_interruptible(&ip6t_mutex) != 0) |
| 1965 | return 0; |
| 1966 | |
| 1967 | LIST_FIND(&ip6t_target, print_target, struct ip6t_target *, |
| 1968 | offset, buffer, length, &pos, &count); |
| 1969 | |
| 1970 | up(&ip6t_mutex); |
| 1971 | |
| 1972 | *start = (char *)((unsigned long)count - offset); |
| 1973 | return pos; |
| 1974 | } |
| 1975 | |
| 1976 | static int ip6t_get_matches(char *buffer, char **start, off_t offset, int length) |
| 1977 | { |
| 1978 | off_t pos = 0; |
| 1979 | unsigned int count = 0; |
| 1980 | |
| 1981 | if (down_interruptible(&ip6t_mutex) != 0) |
| 1982 | return 0; |
| 1983 | |
| 1984 | LIST_FIND(&ip6t_match, print_name, char *, |
| 1985 | offset, buffer, length, &pos, &count); |
| 1986 | |
| 1987 | up(&ip6t_mutex); |
| 1988 | |
| 1989 | *start = (char *)((unsigned long)count - offset); |
| 1990 | return pos; |
| 1991 | } |
| 1992 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 1993 | static const struct { char *name; get_info_t *get_info; } ip6t_proc_entry[] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | { { "ip6_tables_names", ip6t_get_tables }, |
| 1995 | { "ip6_tables_targets", ip6t_get_targets }, |
| 1996 | { "ip6_tables_matches", ip6t_get_matches }, |
| 1997 | { NULL, NULL} }; |
| 1998 | #endif /*CONFIG_PROC_FS*/ |
| 1999 | |
| 2000 | static int __init init(void) |
| 2001 | { |
| 2002 | int ret; |
| 2003 | |
| 2004 | /* Noone else will be downing sem now, so we won't sleep */ |
| 2005 | down(&ip6t_mutex); |
| 2006 | list_append(&ip6t_target, &ip6t_standard_target); |
| 2007 | list_append(&ip6t_target, &ip6t_error_target); |
| 2008 | list_append(&ip6t_match, &tcp_matchstruct); |
| 2009 | list_append(&ip6t_match, &udp_matchstruct); |
| 2010 | list_append(&ip6t_match, &icmp6_matchstruct); |
| 2011 | up(&ip6t_mutex); |
| 2012 | |
| 2013 | /* Register setsockopt */ |
| 2014 | ret = nf_register_sockopt(&ip6t_sockopts); |
| 2015 | if (ret < 0) { |
| 2016 | duprintf("Unable to register sockopts.\n"); |
| 2017 | return ret; |
| 2018 | } |
| 2019 | |
| 2020 | #ifdef CONFIG_PROC_FS |
| 2021 | { |
| 2022 | struct proc_dir_entry *proc; |
| 2023 | int i; |
| 2024 | |
| 2025 | for (i = 0; ip6t_proc_entry[i].name; i++) { |
| 2026 | proc = proc_net_create(ip6t_proc_entry[i].name, 0, |
| 2027 | ip6t_proc_entry[i].get_info); |
| 2028 | if (!proc) { |
| 2029 | while (--i >= 0) |
| 2030 | proc_net_remove(ip6t_proc_entry[i].name); |
| 2031 | nf_unregister_sockopt(&ip6t_sockopts); |
| 2032 | return -ENOMEM; |
| 2033 | } |
| 2034 | proc->owner = THIS_MODULE; |
| 2035 | } |
| 2036 | } |
| 2037 | #endif |
| 2038 | |
| 2039 | printk("ip6_tables: (C) 2000-2002 Netfilter core team\n"); |
| 2040 | return 0; |
| 2041 | } |
| 2042 | |
| 2043 | static void __exit fini(void) |
| 2044 | { |
| 2045 | nf_unregister_sockopt(&ip6t_sockopts); |
| 2046 | #ifdef CONFIG_PROC_FS |
| 2047 | { |
| 2048 | int i; |
| 2049 | for (i = 0; ip6t_proc_entry[i].name; i++) |
| 2050 | proc_net_remove(ip6t_proc_entry[i].name); |
| 2051 | } |
| 2052 | #endif |
| 2053 | } |
| 2054 | |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2055 | /* |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2056 | * find the offset to specified header or the protocol number of last header |
| 2057 | * if target < 0. "last header" is transport protocol header, ESP, or |
| 2058 | * "No next header". |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2059 | * |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2060 | * If target header is found, its offset is set in *offset and return protocol |
| 2061 | * number. Otherwise, return -1. |
| 2062 | * |
| 2063 | * Note that non-1st fragment is special case that "the protocol number |
| 2064 | * of last header" is "next header" field in Fragment header. In this case, |
| 2065 | * *offset is meaningless and fragment offset is stored in *fragoff if fragoff |
| 2066 | * isn't NULL. |
| 2067 | * |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2068 | */ |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2069 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
| 2070 | int target, unsigned short *fragoff) |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2071 | { |
| 2072 | unsigned int start = (u8*)(skb->nh.ipv6h + 1) - skb->data; |
| 2073 | u8 nexthdr = skb->nh.ipv6h->nexthdr; |
| 2074 | unsigned int len = skb->len - start; |
| 2075 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2076 | if (fragoff) |
| 2077 | *fragoff = 0; |
| 2078 | |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2079 | while (nexthdr != target) { |
| 2080 | struct ipv6_opt_hdr _hdr, *hp; |
| 2081 | unsigned int hdrlen; |
| 2082 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2083 | if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) { |
| 2084 | if (target < 0) |
| 2085 | break; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2086 | return -1; |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2087 | } |
| 2088 | |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2089 | hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr); |
| 2090 | if (hp == NULL) |
| 2091 | return -1; |
| 2092 | if (nexthdr == NEXTHDR_FRAGMENT) { |
| 2093 | unsigned short _frag_off, *fp; |
| 2094 | fp = skb_header_pointer(skb, |
| 2095 | start+offsetof(struct frag_hdr, |
| 2096 | frag_off), |
| 2097 | sizeof(_frag_off), |
| 2098 | &_frag_off); |
| 2099 | if (fp == NULL) |
| 2100 | return -1; |
| 2101 | |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2102 | _frag_off = ntohs(*fp) & ~0x7; |
| 2103 | if (_frag_off) { |
| 2104 | if (target < 0 && |
| 2105 | ((!ipv6_ext_hdr(hp->nexthdr)) || |
| 2106 | nexthdr == NEXTHDR_NONE)) { |
| 2107 | if (fragoff) |
| 2108 | *fragoff = _frag_off; |
| 2109 | return hp->nexthdr; |
| 2110 | } |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2111 | return -1; |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2112 | } |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2113 | hdrlen = 8; |
| 2114 | } else if (nexthdr == NEXTHDR_AUTH) |
| 2115 | hdrlen = (hp->hdrlen + 2) << 2; |
| 2116 | else |
| 2117 | hdrlen = ipv6_optlen(hp); |
| 2118 | |
| 2119 | nexthdr = hp->nexthdr; |
| 2120 | len -= hdrlen; |
| 2121 | start += hdrlen; |
| 2122 | } |
| 2123 | |
| 2124 | *offset = start; |
Patrick McHardy | b777e0c | 2006-01-05 12:21:16 -0800 | [diff] [blame] | 2125 | return nexthdr; |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2126 | } |
| 2127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | EXPORT_SYMBOL(ip6t_register_table); |
| 2129 | EXPORT_SYMBOL(ip6t_unregister_table); |
| 2130 | EXPORT_SYMBOL(ip6t_do_table); |
| 2131 | EXPORT_SYMBOL(ip6t_register_match); |
| 2132 | EXPORT_SYMBOL(ip6t_unregister_match); |
| 2133 | EXPORT_SYMBOL(ip6t_register_target); |
| 2134 | EXPORT_SYMBOL(ip6t_unregister_target); |
| 2135 | EXPORT_SYMBOL(ip6t_ext_hdr); |
Yasuyuki Kozakai | e674d0f | 2005-09-19 15:34:40 -0700 | [diff] [blame] | 2136 | EXPORT_SYMBOL(ipv6_find_hdr); |
Patrick McHardy | 22dea56 | 2006-01-05 12:21:34 -0800 | [diff] [blame] | 2137 | EXPORT_SYMBOL(ip6_masked_addrcmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | |
| 2139 | module_init(init); |
| 2140 | module_exit(fini); |