Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Packet matching code. |
| 3 | * |
| 4 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 5 | * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 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 |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 14 | * 08 Oct 2005 Harald Welte <lafore@netfilter.org> |
| 15 | * - Generalize into "x_tables" layer and "{ip,ip6,arp}_tables" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | */ |
| 17 | #include <linux/config.h> |
| 18 | #include <linux/cache.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 19 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/skbuff.h> |
| 21 | #include <linux/kmod.h> |
| 22 | #include <linux/vmalloc.h> |
| 23 | #include <linux/netdevice.h> |
| 24 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/icmp.h> |
| 26 | #include <net/ip.h> |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 27 | #include <net/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <asm/uaccess.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 29 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/proc_fs.h> |
| 31 | #include <linux/err.h> |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 32 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 34 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 36 | |
| 37 | MODULE_LICENSE("GPL"); |
| 38 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 39 | MODULE_DESCRIPTION("IPv4 packet filter"); |
| 40 | |
| 41 | /*#define DEBUG_IP_FIREWALL*/ |
| 42 | /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */ |
| 43 | /*#define DEBUG_IP_FIREWALL_USER*/ |
| 44 | |
| 45 | #ifdef DEBUG_IP_FIREWALL |
| 46 | #define dprintf(format, args...) printk(format , ## args) |
| 47 | #else |
| 48 | #define dprintf(format, args...) |
| 49 | #endif |
| 50 | |
| 51 | #ifdef DEBUG_IP_FIREWALL_USER |
| 52 | #define duprintf(format, args...) printk(format , ## args) |
| 53 | #else |
| 54 | #define duprintf(format, args...) |
| 55 | #endif |
| 56 | |
| 57 | #ifdef CONFIG_NETFILTER_DEBUG |
| 58 | #define IP_NF_ASSERT(x) \ |
| 59 | do { \ |
| 60 | if (!(x)) \ |
| 61 | printk("IP_NF_ASSERT: %s:%s:%u\n", \ |
| 62 | __FUNCTION__, __FILE__, __LINE__); \ |
| 63 | } while(0) |
| 64 | #else |
| 65 | #define IP_NF_ASSERT(x) |
| 66 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | #if 0 |
| 69 | /* All the better to debug you with... */ |
| 70 | #define static |
| 71 | #define inline |
| 72 | #endif |
| 73 | |
| 74 | /* |
| 75 | We keep a set of rules for each CPU, so we can avoid write-locking |
| 76 | them in the softirq when updating the counters and therefore |
| 77 | only need to read-lock in the softirq; doing a write_lock_bh() in user |
| 78 | context stops packets coming through and allows user context to read |
| 79 | the counters or update the rules. |
| 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | Hence the start of any table is given by get_table() below. */ |
| 82 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | /* Returns whether matches rule or not. */ |
| 84 | static inline int |
| 85 | ip_packet_match(const struct iphdr *ip, |
| 86 | const char *indev, |
| 87 | const char *outdev, |
| 88 | const struct ipt_ip *ipinfo, |
| 89 | int isfrag) |
| 90 | { |
| 91 | size_t i; |
| 92 | unsigned long ret; |
| 93 | |
| 94 | #define FWINV(bool,invflg) ((bool) ^ !!(ipinfo->invflags & invflg)) |
| 95 | |
| 96 | if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr, |
| 97 | IPT_INV_SRCIP) |
| 98 | || FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr, |
| 99 | IPT_INV_DSTIP)) { |
| 100 | dprintf("Source or dest mismatch.\n"); |
| 101 | |
| 102 | dprintf("SRC: %u.%u.%u.%u. Mask: %u.%u.%u.%u. Target: %u.%u.%u.%u.%s\n", |
| 103 | NIPQUAD(ip->saddr), |
| 104 | NIPQUAD(ipinfo->smsk.s_addr), |
| 105 | NIPQUAD(ipinfo->src.s_addr), |
| 106 | ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : ""); |
| 107 | dprintf("DST: %u.%u.%u.%u Mask: %u.%u.%u.%u Target: %u.%u.%u.%u.%s\n", |
| 108 | NIPQUAD(ip->daddr), |
| 109 | NIPQUAD(ipinfo->dmsk.s_addr), |
| 110 | NIPQUAD(ipinfo->dst.s_addr), |
| 111 | ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : ""); |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | /* Look for ifname matches; this should unroll nicely. */ |
| 116 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { |
| 117 | ret |= (((const unsigned long *)indev)[i] |
| 118 | ^ ((const unsigned long *)ipinfo->iniface)[i]) |
| 119 | & ((const unsigned long *)ipinfo->iniface_mask)[i]; |
| 120 | } |
| 121 | |
| 122 | if (FWINV(ret != 0, IPT_INV_VIA_IN)) { |
| 123 | dprintf("VIA in mismatch (%s vs %s).%s\n", |
| 124 | indev, ipinfo->iniface, |
| 125 | ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":""); |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) { |
| 130 | ret |= (((const unsigned long *)outdev)[i] |
| 131 | ^ ((const unsigned long *)ipinfo->outiface)[i]) |
| 132 | & ((const unsigned long *)ipinfo->outiface_mask)[i]; |
| 133 | } |
| 134 | |
| 135 | if (FWINV(ret != 0, IPT_INV_VIA_OUT)) { |
| 136 | dprintf("VIA out mismatch (%s vs %s).%s\n", |
| 137 | outdev, ipinfo->outiface, |
| 138 | ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":""); |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | /* Check specific protocol */ |
| 143 | if (ipinfo->proto |
| 144 | && FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) { |
| 145 | dprintf("Packet protocol %hi does not match %hi.%s\n", |
| 146 | ip->protocol, ipinfo->proto, |
| 147 | ipinfo->invflags&IPT_INV_PROTO ? " (INV)":""); |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | /* If we have a fragment rule but the packet is not a fragment |
| 152 | * then we return zero */ |
| 153 | if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) { |
| 154 | dprintf("Fragment rule but not fragment.%s\n", |
| 155 | ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : ""); |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | return 1; |
| 160 | } |
| 161 | |
| 162 | static inline int |
| 163 | ip_checkentry(const struct ipt_ip *ip) |
| 164 | { |
| 165 | if (ip->flags & ~IPT_F_MASK) { |
| 166 | duprintf("Unknown flag bits set: %08X\n", |
| 167 | ip->flags & ~IPT_F_MASK); |
| 168 | return 0; |
| 169 | } |
| 170 | if (ip->invflags & ~IPT_INV_MASK) { |
| 171 | duprintf("Unknown invflag bits set: %08X\n", |
| 172 | ip->invflags & ~IPT_INV_MASK); |
| 173 | return 0; |
| 174 | } |
| 175 | return 1; |
| 176 | } |
| 177 | |
| 178 | static unsigned int |
| 179 | ipt_error(struct sk_buff **pskb, |
| 180 | const struct net_device *in, |
| 181 | const struct net_device *out, |
| 182 | unsigned int hooknum, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame] | 183 | const struct xt_target *target, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | const void *targinfo, |
| 185 | void *userinfo) |
| 186 | { |
| 187 | if (net_ratelimit()) |
| 188 | printk("ip_tables: error: `%s'\n", (char *)targinfo); |
| 189 | |
| 190 | return NF_DROP; |
| 191 | } |
| 192 | |
| 193 | static inline |
| 194 | int do_match(struct ipt_entry_match *m, |
| 195 | const struct sk_buff *skb, |
| 196 | const struct net_device *in, |
| 197 | const struct net_device *out, |
| 198 | int offset, |
| 199 | int *hotdrop) |
| 200 | { |
| 201 | /* Stop iteration if it doesn't match */ |
Patrick McHardy | 1c52483 | 2006-03-20 18:02:15 -0800 | [diff] [blame] | 202 | if (!m->u.kernel.match->match(skb, in, out, m->u.kernel.match, m->data, |
| 203 | offset, skb->nh.iph->ihl*4, hotdrop)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | return 1; |
| 205 | else |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static inline struct ipt_entry * |
| 210 | get_entry(void *base, unsigned int offset) |
| 211 | { |
| 212 | return (struct ipt_entry *)(base + offset); |
| 213 | } |
| 214 | |
| 215 | /* Returns one of the generic firewall policies, like NF_ACCEPT. */ |
| 216 | unsigned int |
| 217 | ipt_do_table(struct sk_buff **pskb, |
| 218 | unsigned int hook, |
| 219 | const struct net_device *in, |
| 220 | const struct net_device *out, |
| 221 | struct ipt_table *table, |
| 222 | void *userdata) |
| 223 | { |
| 224 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
| 225 | u_int16_t offset; |
| 226 | struct iphdr *ip; |
| 227 | u_int16_t datalen; |
| 228 | int hotdrop = 0; |
| 229 | /* Initializing verdict to NF_DROP keeps gcc happy. */ |
| 230 | unsigned int verdict = NF_DROP; |
| 231 | const char *indev, *outdev; |
| 232 | void *table_base; |
| 233 | struct ipt_entry *e, *back; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 234 | struct xt_table_info *private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
| 236 | /* Initialization */ |
| 237 | ip = (*pskb)->nh.iph; |
| 238 | datalen = (*pskb)->len - ip->ihl * 4; |
| 239 | indev = in ? in->name : nulldevname; |
| 240 | outdev = out ? out->name : nulldevname; |
| 241 | /* We handle fragments by dealing with the first fragment as |
| 242 | * if it was a normal packet. All other fragments are treated |
| 243 | * normally, except that they will NEVER match rules that ask |
| 244 | * things we don't know, ie. tcp syn flag or ports). If the |
| 245 | * rule is also a fragment-specific rule, non-fragments won't |
| 246 | * match it. */ |
| 247 | offset = ntohs(ip->frag_off) & IP_OFFSET; |
| 248 | |
| 249 | read_lock_bh(&table->lock); |
| 250 | IP_NF_ASSERT(table->valid_hooks & (1 << hook)); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 251 | table_base = (void *)private->entries[smp_processor_id()]; |
| 252 | e = get_entry(table_base, private->hook_entry[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | /* For return from builtin chain */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 255 | back = get_entry(table_base, private->underflow[hook]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
| 257 | do { |
| 258 | IP_NF_ASSERT(e); |
| 259 | IP_NF_ASSERT(back); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) { |
| 261 | struct ipt_entry_target *t; |
| 262 | |
| 263 | if (IPT_MATCH_ITERATE(e, do_match, |
| 264 | *pskb, in, out, |
| 265 | offset, &hotdrop) != 0) |
| 266 | goto no_match; |
| 267 | |
| 268 | ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1); |
| 269 | |
| 270 | t = ipt_get_target(e); |
| 271 | IP_NF_ASSERT(t->u.kernel.target); |
| 272 | /* Standard target? */ |
| 273 | if (!t->u.kernel.target->target) { |
| 274 | int v; |
| 275 | |
| 276 | v = ((struct ipt_standard_target *)t)->verdict; |
| 277 | if (v < 0) { |
| 278 | /* Pop from stack? */ |
| 279 | if (v != IPT_RETURN) { |
| 280 | verdict = (unsigned)(-v) - 1; |
| 281 | break; |
| 282 | } |
| 283 | e = back; |
| 284 | back = get_entry(table_base, |
| 285 | back->comefrom); |
| 286 | continue; |
| 287 | } |
Patrick McHardy | 0546534 | 2005-08-21 23:31:43 -0700 | [diff] [blame] | 288 | if (table_base + v != (void *)e + e->next_offset |
| 289 | && !(e->ip.flags & IPT_F_GOTO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | /* Save old back ptr in next entry */ |
| 291 | struct ipt_entry *next |
| 292 | = (void *)e + e->next_offset; |
| 293 | next->comefrom |
| 294 | = (void *)back - table_base; |
| 295 | /* set back pointer to next entry */ |
| 296 | back = next; |
| 297 | } |
| 298 | |
| 299 | e = get_entry(table_base, v); |
| 300 | } else { |
| 301 | /* Targets which reenter must return |
| 302 | abs. verdicts */ |
| 303 | #ifdef CONFIG_NETFILTER_DEBUG |
| 304 | ((struct ipt_entry *)table_base)->comefrom |
| 305 | = 0xeeeeeeec; |
| 306 | #endif |
| 307 | verdict = t->u.kernel.target->target(pskb, |
| 308 | in, out, |
| 309 | hook, |
Patrick McHardy | 1c52483 | 2006-03-20 18:02:15 -0800 | [diff] [blame] | 310 | t->u.kernel.target, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | t->data, |
| 312 | userdata); |
| 313 | |
| 314 | #ifdef CONFIG_NETFILTER_DEBUG |
| 315 | if (((struct ipt_entry *)table_base)->comefrom |
| 316 | != 0xeeeeeeec |
| 317 | && verdict == IPT_CONTINUE) { |
| 318 | printk("Target %s reentered!\n", |
| 319 | t->u.kernel.target->name); |
| 320 | verdict = NF_DROP; |
| 321 | } |
| 322 | ((struct ipt_entry *)table_base)->comefrom |
| 323 | = 0x57acc001; |
| 324 | #endif |
| 325 | /* Target might have changed stuff. */ |
| 326 | ip = (*pskb)->nh.iph; |
| 327 | datalen = (*pskb)->len - ip->ihl * 4; |
| 328 | |
| 329 | if (verdict == IPT_CONTINUE) |
| 330 | e = (void *)e + e->next_offset; |
| 331 | else |
| 332 | /* Verdict */ |
| 333 | break; |
| 334 | } |
| 335 | } else { |
| 336 | |
| 337 | no_match: |
| 338 | e = (void *)e + e->next_offset; |
| 339 | } |
| 340 | } while (!hotdrop); |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | read_unlock_bh(&table->lock); |
| 343 | |
| 344 | #ifdef DEBUG_ALLOW_ALL |
| 345 | return NF_ACCEPT; |
| 346 | #else |
| 347 | if (hotdrop) |
| 348 | return NF_DROP; |
| 349 | else return verdict; |
| 350 | #endif |
| 351 | } |
| 352 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | /* All zeroes == unconditional rule. */ |
| 354 | static inline int |
| 355 | unconditional(const struct ipt_ip *ip) |
| 356 | { |
| 357 | unsigned int i; |
| 358 | |
| 359 | for (i = 0; i < sizeof(*ip)/sizeof(__u32); i++) |
| 360 | if (((__u32 *)ip)[i]) |
| 361 | return 0; |
| 362 | |
| 363 | return 1; |
| 364 | } |
| 365 | |
| 366 | /* Figures out from what hook each rule can be called: returns 0 if |
| 367 | there are loops. Puts hook bitmask in comefrom. */ |
| 368 | static int |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 369 | mark_source_chains(struct xt_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 370 | unsigned int valid_hooks, void *entry0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | { |
| 372 | unsigned int hook; |
| 373 | |
| 374 | /* No recursion; use packet counter to save back ptrs (reset |
| 375 | to 0 as we leave), and comefrom to save source hook bitmask */ |
| 376 | for (hook = 0; hook < NF_IP_NUMHOOKS; hook++) { |
| 377 | unsigned int pos = newinfo->hook_entry[hook]; |
| 378 | struct ipt_entry *e |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 379 | = (struct ipt_entry *)(entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
| 381 | if (!(valid_hooks & (1 << hook))) |
| 382 | continue; |
| 383 | |
| 384 | /* Set initial back pointer. */ |
| 385 | e->counters.pcnt = pos; |
| 386 | |
| 387 | for (;;) { |
| 388 | struct ipt_standard_target *t |
| 389 | = (void *)ipt_get_target(e); |
| 390 | |
| 391 | if (e->comefrom & (1 << NF_IP_NUMHOOKS)) { |
| 392 | printk("iptables: loop hook %u pos %u %08X.\n", |
| 393 | hook, pos, e->comefrom); |
| 394 | return 0; |
| 395 | } |
| 396 | e->comefrom |
| 397 | |= ((1 << hook) | (1 << NF_IP_NUMHOOKS)); |
| 398 | |
| 399 | /* Unconditional return/END. */ |
| 400 | if (e->target_offset == sizeof(struct ipt_entry) |
| 401 | && (strcmp(t->target.u.user.name, |
| 402 | IPT_STANDARD_TARGET) == 0) |
| 403 | && t->verdict < 0 |
| 404 | && unconditional(&e->ip)) { |
| 405 | unsigned int oldpos, size; |
| 406 | |
| 407 | /* Return: backtrack through the last |
| 408 | big jump. */ |
| 409 | do { |
| 410 | e->comefrom ^= (1<<NF_IP_NUMHOOKS); |
| 411 | #ifdef DEBUG_IP_FIREWALL_USER |
| 412 | if (e->comefrom |
| 413 | & (1 << NF_IP_NUMHOOKS)) { |
| 414 | duprintf("Back unset " |
| 415 | "on hook %u " |
| 416 | "rule %u\n", |
| 417 | hook, pos); |
| 418 | } |
| 419 | #endif |
| 420 | oldpos = pos; |
| 421 | pos = e->counters.pcnt; |
| 422 | e->counters.pcnt = 0; |
| 423 | |
| 424 | /* We're at the start. */ |
| 425 | if (pos == oldpos) |
| 426 | goto next; |
| 427 | |
| 428 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 429 | (entry0 + pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | } while (oldpos == pos + e->next_offset); |
| 431 | |
| 432 | /* Move along one */ |
| 433 | size = e->next_offset; |
| 434 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 435 | (entry0 + pos + size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | e->counters.pcnt = pos; |
| 437 | pos += size; |
| 438 | } else { |
| 439 | int newpos = t->verdict; |
| 440 | |
| 441 | if (strcmp(t->target.u.user.name, |
| 442 | IPT_STANDARD_TARGET) == 0 |
| 443 | && newpos >= 0) { |
| 444 | /* This a jump; chase it. */ |
| 445 | duprintf("Jump rule %u -> %u\n", |
| 446 | pos, newpos); |
| 447 | } else { |
| 448 | /* ... this is a fallthru */ |
| 449 | newpos = pos + e->next_offset; |
| 450 | } |
| 451 | e = (struct ipt_entry *) |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 452 | (entry0 + newpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | e->counters.pcnt = pos; |
| 454 | pos = newpos; |
| 455 | } |
| 456 | } |
| 457 | next: |
| 458 | duprintf("Finished chain %u\n", hook); |
| 459 | } |
| 460 | return 1; |
| 461 | } |
| 462 | |
| 463 | static inline int |
| 464 | cleanup_match(struct ipt_entry_match *m, unsigned int *i) |
| 465 | { |
| 466 | if (i && (*i)-- == 0) |
| 467 | return 1; |
| 468 | |
| 469 | if (m->u.kernel.match->destroy) |
Patrick McHardy | 1c52483 | 2006-03-20 18:02:15 -0800 | [diff] [blame] | 470 | m->u.kernel.match->destroy(m->u.kernel.match, m->data, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | m->u.match_size - sizeof(*m)); |
| 472 | module_put(m->u.kernel.match->me); |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | static inline int |
| 477 | standard_check(const struct ipt_entry_target *t, |
| 478 | unsigned int max_offset) |
| 479 | { |
| 480 | struct ipt_standard_target *targ = (void *)t; |
| 481 | |
| 482 | /* Check standard info. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | if (targ->verdict >= 0 |
| 484 | && targ->verdict > max_offset - sizeof(struct ipt_entry)) { |
| 485 | duprintf("ipt_standard_check: bad verdict (%i)\n", |
| 486 | targ->verdict); |
| 487 | return 0; |
| 488 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | if (targ->verdict < -NF_MAX_VERDICT - 1) { |
| 490 | duprintf("ipt_standard_check: bad negative verdict (%i)\n", |
| 491 | targ->verdict); |
| 492 | return 0; |
| 493 | } |
| 494 | return 1; |
| 495 | } |
| 496 | |
| 497 | static inline int |
| 498 | check_match(struct ipt_entry_match *m, |
| 499 | const char *name, |
| 500 | const struct ipt_ip *ip, |
| 501 | unsigned int hookmask, |
| 502 | unsigned int *i) |
| 503 | { |
| 504 | struct ipt_match *match; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 505 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 507 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | m->u.user.revision), |
| 509 | "ipt_%s", m->u.user.name); |
| 510 | if (IS_ERR(match) || !match) { |
| 511 | duprintf("check_match: `%s' not found\n", m->u.user.name); |
| 512 | return match ? PTR_ERR(match) : -ENOENT; |
| 513 | } |
| 514 | m->u.kernel.match = match; |
| 515 | |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 516 | ret = xt_check_match(match, AF_INET, m->u.match_size - sizeof(*m), |
| 517 | name, hookmask, ip->proto, |
| 518 | ip->invflags & IPT_INV_PROTO); |
| 519 | if (ret) |
| 520 | goto err; |
| 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | if (m->u.kernel.match->checkentry |
Patrick McHardy | 1c52483 | 2006-03-20 18:02:15 -0800 | [diff] [blame] | 523 | && !m->u.kernel.match->checkentry(name, ip, match, m->data, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | m->u.match_size - sizeof(*m), |
| 525 | hookmask)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | duprintf("ip_tables: check failed for `%s'.\n", |
| 527 | m->u.kernel.match->name); |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 528 | ret = -EINVAL; |
| 529 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | } |
| 531 | |
| 532 | (*i)++; |
| 533 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 534 | err: |
| 535 | module_put(m->u.kernel.match->me); |
| 536 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | } |
| 538 | |
| 539 | static struct ipt_target ipt_standard_target; |
| 540 | |
| 541 | static inline int |
| 542 | check_entry(struct ipt_entry *e, const char *name, unsigned int size, |
| 543 | unsigned int *i) |
| 544 | { |
| 545 | struct ipt_entry_target *t; |
| 546 | struct ipt_target *target; |
| 547 | int ret; |
| 548 | unsigned int j; |
| 549 | |
| 550 | if (!ip_checkentry(&e->ip)) { |
| 551 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); |
| 552 | return -EINVAL; |
| 553 | } |
| 554 | |
| 555 | j = 0; |
| 556 | ret = IPT_MATCH_ITERATE(e, check_match, name, &e->ip, e->comefrom, &j); |
| 557 | if (ret != 0) |
| 558 | goto cleanup_matches; |
| 559 | |
| 560 | t = ipt_get_target(e); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 561 | target = try_then_request_module(xt_find_target(AF_INET, |
| 562 | t->u.user.name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | t->u.user.revision), |
| 564 | "ipt_%s", t->u.user.name); |
| 565 | if (IS_ERR(target) || !target) { |
| 566 | duprintf("check_entry: `%s' not found\n", t->u.user.name); |
| 567 | ret = target ? PTR_ERR(target) : -ENOENT; |
| 568 | goto cleanup_matches; |
| 569 | } |
| 570 | t->u.kernel.target = target; |
| 571 | |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 572 | ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t), |
| 573 | name, e->comefrom, e->ip.proto, |
| 574 | e->ip.invflags & IPT_INV_PROTO); |
| 575 | if (ret) |
| 576 | goto err; |
| 577 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | if (t->u.kernel.target == &ipt_standard_target) { |
| 579 | if (!standard_check(t, size)) { |
| 580 | ret = -EINVAL; |
| 581 | goto cleanup_matches; |
| 582 | } |
| 583 | } else if (t->u.kernel.target->checkentry |
Patrick McHardy | 1c52483 | 2006-03-20 18:02:15 -0800 | [diff] [blame] | 584 | && !t->u.kernel.target->checkentry(name, e, target, t->data, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | t->u.target_size |
| 586 | - sizeof(*t), |
| 587 | e->comefrom)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | duprintf("ip_tables: check failed for `%s'.\n", |
| 589 | t->u.kernel.target->name); |
| 590 | ret = -EINVAL; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 591 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | (*i)++; |
| 595 | return 0; |
Patrick McHardy | 3cdc7c9 | 2006-03-20 18:00:36 -0800 | [diff] [blame] | 596 | err: |
| 597 | module_put(t->u.kernel.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | cleanup_matches: |
| 599 | IPT_MATCH_ITERATE(e, cleanup_match, &j); |
| 600 | return ret; |
| 601 | } |
| 602 | |
| 603 | static inline int |
| 604 | check_entry_size_and_hooks(struct ipt_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 605 | struct xt_table_info *newinfo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | unsigned char *base, |
| 607 | unsigned char *limit, |
| 608 | const unsigned int *hook_entries, |
| 609 | const unsigned int *underflows, |
| 610 | unsigned int *i) |
| 611 | { |
| 612 | unsigned int h; |
| 613 | |
| 614 | if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 |
| 615 | || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) { |
| 616 | duprintf("Bad offset %p\n", e); |
| 617 | return -EINVAL; |
| 618 | } |
| 619 | |
| 620 | if (e->next_offset |
| 621 | < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) { |
| 622 | duprintf("checking: element %p size %u\n", |
| 623 | e, e->next_offset); |
| 624 | return -EINVAL; |
| 625 | } |
| 626 | |
| 627 | /* Check hooks & underflows */ |
| 628 | for (h = 0; h < NF_IP_NUMHOOKS; h++) { |
| 629 | if ((unsigned char *)e - base == hook_entries[h]) |
| 630 | newinfo->hook_entry[h] = hook_entries[h]; |
| 631 | if ((unsigned char *)e - base == underflows[h]) |
| 632 | newinfo->underflow[h] = underflows[h]; |
| 633 | } |
| 634 | |
| 635 | /* FIXME: underflows must be unconditional, standard verdicts |
| 636 | < 0 (not IPT_RETURN). --RR */ |
| 637 | |
| 638 | /* Clear counters and comefrom */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 639 | e->counters = ((struct xt_counters) { 0, 0 }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | e->comefrom = 0; |
| 641 | |
| 642 | (*i)++; |
| 643 | return 0; |
| 644 | } |
| 645 | |
| 646 | static inline int |
| 647 | cleanup_entry(struct ipt_entry *e, unsigned int *i) |
| 648 | { |
| 649 | struct ipt_entry_target *t; |
| 650 | |
| 651 | if (i && (*i)-- == 0) |
| 652 | return 1; |
| 653 | |
| 654 | /* Cleanup all matches */ |
| 655 | IPT_MATCH_ITERATE(e, cleanup_match, NULL); |
| 656 | t = ipt_get_target(e); |
| 657 | if (t->u.kernel.target->destroy) |
Patrick McHardy | 1c52483 | 2006-03-20 18:02:15 -0800 | [diff] [blame] | 658 | t->u.kernel.target->destroy(t->u.kernel.target, t->data, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | t->u.target_size - sizeof(*t)); |
| 660 | module_put(t->u.kernel.target->me); |
| 661 | return 0; |
| 662 | } |
| 663 | |
| 664 | /* Checks and translates the user-supplied table segment (held in |
| 665 | newinfo) */ |
| 666 | static int |
| 667 | translate_table(const char *name, |
| 668 | unsigned int valid_hooks, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 669 | struct xt_table_info *newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 670 | void *entry0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | unsigned int size, |
| 672 | unsigned int number, |
| 673 | const unsigned int *hook_entries, |
| 674 | const unsigned int *underflows) |
| 675 | { |
| 676 | unsigned int i; |
| 677 | int ret; |
| 678 | |
| 679 | newinfo->size = size; |
| 680 | newinfo->number = number; |
| 681 | |
| 682 | /* Init all hooks to impossible value. */ |
| 683 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { |
| 684 | newinfo->hook_entry[i] = 0xFFFFFFFF; |
| 685 | newinfo->underflow[i] = 0xFFFFFFFF; |
| 686 | } |
| 687 | |
| 688 | duprintf("translate_table: size %u\n", newinfo->size); |
| 689 | i = 0; |
| 690 | /* Walk through entries, checking offsets. */ |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 691 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | check_entry_size_and_hooks, |
| 693 | newinfo, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 694 | entry0, |
| 695 | entry0 + size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | hook_entries, underflows, &i); |
| 697 | if (ret != 0) |
| 698 | return ret; |
| 699 | |
| 700 | if (i != number) { |
| 701 | duprintf("translate_table: %u not %u entries\n", |
| 702 | i, number); |
| 703 | return -EINVAL; |
| 704 | } |
| 705 | |
| 706 | /* Check hooks all assigned */ |
| 707 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { |
| 708 | /* Only hooks which are valid */ |
| 709 | if (!(valid_hooks & (1 << i))) |
| 710 | continue; |
| 711 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { |
| 712 | duprintf("Invalid hook entry %u %u\n", |
| 713 | i, hook_entries[i]); |
| 714 | return -EINVAL; |
| 715 | } |
| 716 | if (newinfo->underflow[i] == 0xFFFFFFFF) { |
| 717 | duprintf("Invalid underflow %u %u\n", |
| 718 | i, underflows[i]); |
| 719 | return -EINVAL; |
| 720 | } |
| 721 | } |
| 722 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 723 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | return -ELOOP; |
| 725 | |
| 726 | /* Finally, each sanity check must pass */ |
| 727 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 728 | ret = IPT_ENTRY_ITERATE(entry0, newinfo->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | check_entry, name, size, &i); |
| 730 | |
| 731 | if (ret != 0) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 732 | IPT_ENTRY_ITERATE(entry0, newinfo->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | cleanup_entry, &i); |
| 734 | return ret; |
| 735 | } |
| 736 | |
| 737 | /* And one copy for every other CPU */ |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 738 | for_each_possible_cpu(i) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 739 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
| 740 | memcpy(newinfo->entries[i], entry0, newinfo->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | } |
| 742 | |
| 743 | return ret; |
| 744 | } |
| 745 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | /* Gets counters. */ |
| 747 | static inline int |
| 748 | add_entry_to_counter(const struct ipt_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 749 | struct xt_counters total[], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | unsigned int *i) |
| 751 | { |
| 752 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); |
| 753 | |
| 754 | (*i)++; |
| 755 | return 0; |
| 756 | } |
| 757 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 758 | static inline int |
| 759 | set_entry_to_counter(const struct ipt_entry *e, |
| 760 | struct ipt_counters total[], |
| 761 | unsigned int *i) |
| 762 | { |
| 763 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); |
| 764 | |
| 765 | (*i)++; |
| 766 | return 0; |
| 767 | } |
| 768 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | static void |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 770 | get_counters(const struct xt_table_info *t, |
| 771 | struct xt_counters counters[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | { |
| 773 | unsigned int cpu; |
| 774 | unsigned int i; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 775 | unsigned int curcpu; |
| 776 | |
| 777 | /* Instead of clearing (by a previous call to memset()) |
| 778 | * the counters and using adds, we set the counters |
| 779 | * with data used by 'current' CPU |
| 780 | * We dont care about preemption here. |
| 781 | */ |
| 782 | curcpu = raw_smp_processor_id(); |
| 783 | |
| 784 | i = 0; |
| 785 | IPT_ENTRY_ITERATE(t->entries[curcpu], |
| 786 | t->size, |
| 787 | set_entry_to_counter, |
| 788 | counters, |
| 789 | &i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 791 | for_each_possible_cpu(cpu) { |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 792 | if (cpu == curcpu) |
| 793 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 795 | IPT_ENTRY_ITERATE(t->entries[cpu], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | t->size, |
| 797 | add_entry_to_counter, |
| 798 | counters, |
| 799 | &i); |
| 800 | } |
| 801 | } |
| 802 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 803 | static inline struct xt_counters * alloc_counters(struct ipt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 805 | unsigned int countersize; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 806 | struct xt_counters *counters; |
| 807 | struct xt_table_info *private = table->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
| 809 | /* We need atomic snapshot of counters: rest doesn't change |
| 810 | (other than comefrom, which userspace doesn't care |
| 811 | about). */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 812 | countersize = sizeof(struct xt_counters) * private->number; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 813 | counters = vmalloc_node(countersize, numa_node_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | |
| 815 | if (counters == NULL) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 816 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | |
| 818 | /* First, sum counters... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | write_lock_bh(&table->lock); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 820 | get_counters(private, counters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | write_unlock_bh(&table->lock); |
| 822 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 823 | return counters; |
| 824 | } |
| 825 | |
| 826 | static int |
| 827 | copy_entries_to_user(unsigned int total_size, |
| 828 | struct ipt_table *table, |
| 829 | void __user *userptr) |
| 830 | { |
| 831 | unsigned int off, num; |
| 832 | struct ipt_entry *e; |
| 833 | struct xt_counters *counters; |
| 834 | struct xt_table_info *private = table->private; |
| 835 | int ret = 0; |
| 836 | void *loc_cpu_entry; |
| 837 | |
| 838 | counters = alloc_counters(table); |
| 839 | if (IS_ERR(counters)) |
| 840 | return PTR_ERR(counters); |
| 841 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 842 | /* choose the copy that is on our node/cpu, ... |
| 843 | * This choice is lazy (because current thread is |
| 844 | * allowed to migrate to another cpu) |
| 845 | */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 846 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 847 | /* ... then copy entire thing ... */ |
| 848 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | ret = -EFAULT; |
| 850 | goto free_counters; |
| 851 | } |
| 852 | |
| 853 | /* FIXME: use iterator macros --RR */ |
| 854 | /* ... then go back and fix counters and names */ |
| 855 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ |
| 856 | unsigned int i; |
| 857 | struct ipt_entry_match *m; |
| 858 | struct ipt_entry_target *t; |
| 859 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 860 | e = (struct ipt_entry *)(loc_cpu_entry + off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | if (copy_to_user(userptr + off |
| 862 | + offsetof(struct ipt_entry, counters), |
| 863 | &counters[num], |
| 864 | sizeof(counters[num])) != 0) { |
| 865 | ret = -EFAULT; |
| 866 | goto free_counters; |
| 867 | } |
| 868 | |
| 869 | for (i = sizeof(struct ipt_entry); |
| 870 | i < e->target_offset; |
| 871 | i += m->u.match_size) { |
| 872 | m = (void *)e + i; |
| 873 | |
| 874 | if (copy_to_user(userptr + off + i |
| 875 | + offsetof(struct ipt_entry_match, |
| 876 | u.user.name), |
| 877 | m->u.kernel.match->name, |
| 878 | strlen(m->u.kernel.match->name)+1) |
| 879 | != 0) { |
| 880 | ret = -EFAULT; |
| 881 | goto free_counters; |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | t = ipt_get_target(e); |
| 886 | if (copy_to_user(userptr + off + e->target_offset |
| 887 | + offsetof(struct ipt_entry_target, |
| 888 | u.user.name), |
| 889 | t->u.kernel.target->name, |
| 890 | strlen(t->u.kernel.target->name)+1) != 0) { |
| 891 | ret = -EFAULT; |
| 892 | goto free_counters; |
| 893 | } |
| 894 | } |
| 895 | |
| 896 | free_counters: |
| 897 | vfree(counters); |
| 898 | return ret; |
| 899 | } |
| 900 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 901 | #ifdef CONFIG_COMPAT |
| 902 | struct compat_delta { |
| 903 | struct compat_delta *next; |
| 904 | u_int16_t offset; |
| 905 | short delta; |
| 906 | }; |
| 907 | |
| 908 | static struct compat_delta *compat_offsets = NULL; |
| 909 | |
| 910 | static int compat_add_offset(u_int16_t offset, short delta) |
| 911 | { |
| 912 | struct compat_delta *tmp; |
| 913 | |
| 914 | tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL); |
| 915 | if (!tmp) |
| 916 | return -ENOMEM; |
| 917 | tmp->offset = offset; |
| 918 | tmp->delta = delta; |
| 919 | if (compat_offsets) { |
| 920 | tmp->next = compat_offsets->next; |
| 921 | compat_offsets->next = tmp; |
| 922 | } else { |
| 923 | compat_offsets = tmp; |
| 924 | tmp->next = NULL; |
| 925 | } |
| 926 | return 0; |
| 927 | } |
| 928 | |
| 929 | static void compat_flush_offsets(void) |
| 930 | { |
| 931 | struct compat_delta *tmp, *next; |
| 932 | |
| 933 | if (compat_offsets) { |
| 934 | for(tmp = compat_offsets; tmp; tmp = next) { |
| 935 | next = tmp->next; |
| 936 | kfree(tmp); |
| 937 | } |
| 938 | compat_offsets = NULL; |
| 939 | } |
| 940 | } |
| 941 | |
| 942 | static short compat_calc_jump(u_int16_t offset) |
| 943 | { |
| 944 | struct compat_delta *tmp; |
| 945 | short delta; |
| 946 | |
| 947 | for(tmp = compat_offsets, delta = 0; tmp; tmp = tmp->next) |
| 948 | if (tmp->offset < offset) |
| 949 | delta += tmp->delta; |
| 950 | return delta; |
| 951 | } |
| 952 | |
| 953 | struct compat_ipt_standard_target |
| 954 | { |
| 955 | struct compat_xt_entry_target target; |
| 956 | compat_int_t verdict; |
| 957 | }; |
| 958 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 959 | struct compat_ipt_standard |
| 960 | { |
| 961 | struct compat_ipt_entry entry; |
| 962 | struct compat_ipt_standard_target target; |
| 963 | }; |
| 964 | |
Patrick McHardy | 46c5ea3c | 2006-05-02 05:12:22 +0200 | [diff] [blame] | 965 | #define IPT_ST_LEN XT_ALIGN(sizeof(struct ipt_standard_target)) |
| 966 | #define IPT_ST_COMPAT_LEN COMPAT_XT_ALIGN(sizeof(struct compat_ipt_standard_target)) |
| 967 | #define IPT_ST_OFFSET (IPT_ST_LEN - IPT_ST_COMPAT_LEN) |
| 968 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 969 | static int compat_ipt_standard_fn(void *target, |
| 970 | void **dstptr, int *size, int convert) |
| 971 | { |
| 972 | struct compat_ipt_standard_target compat_st, *pcompat_st; |
| 973 | struct ipt_standard_target st, *pst; |
| 974 | int ret; |
| 975 | |
| 976 | ret = 0; |
| 977 | switch (convert) { |
| 978 | case COMPAT_TO_USER: |
Patrick McHardy | 46c5ea3c | 2006-05-02 05:12:22 +0200 | [diff] [blame] | 979 | pst = target; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 980 | memcpy(&compat_st.target, &pst->target, |
Patrick McHardy | 46c5ea3c | 2006-05-02 05:12:22 +0200 | [diff] [blame] | 981 | sizeof(compat_st.target)); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 982 | compat_st.verdict = pst->verdict; |
| 983 | if (compat_st.verdict > 0) |
| 984 | compat_st.verdict -= |
| 985 | compat_calc_jump(compat_st.verdict); |
Patrick McHardy | 46c5ea3c | 2006-05-02 05:12:22 +0200 | [diff] [blame] | 986 | compat_st.target.u.user.target_size = IPT_ST_COMPAT_LEN; |
| 987 | if (copy_to_user(*dstptr, &compat_st, IPT_ST_COMPAT_LEN)) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 988 | ret = -EFAULT; |
| 989 | *size -= IPT_ST_OFFSET; |
Patrick McHardy | 46c5ea3c | 2006-05-02 05:12:22 +0200 | [diff] [blame] | 990 | *dstptr += IPT_ST_COMPAT_LEN; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 991 | break; |
| 992 | case COMPAT_FROM_USER: |
Patrick McHardy | 46c5ea3c | 2006-05-02 05:12:22 +0200 | [diff] [blame] | 993 | pcompat_st = target; |
| 994 | memcpy(&st.target, &pcompat_st->target, IPT_ST_COMPAT_LEN); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 995 | st.verdict = pcompat_st->verdict; |
| 996 | if (st.verdict > 0) |
| 997 | st.verdict += compat_calc_jump(st.verdict); |
Patrick McHardy | 46c5ea3c | 2006-05-02 05:12:22 +0200 | [diff] [blame] | 998 | st.target.u.user.target_size = IPT_ST_LEN; |
| 999 | memcpy(*dstptr, &st, IPT_ST_LEN); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1000 | *size += IPT_ST_OFFSET; |
Patrick McHardy | 46c5ea3c | 2006-05-02 05:12:22 +0200 | [diff] [blame] | 1001 | *dstptr += IPT_ST_LEN; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1002 | break; |
| 1003 | case COMPAT_CALC_SIZE: |
| 1004 | *size += IPT_ST_OFFSET; |
| 1005 | break; |
| 1006 | default: |
| 1007 | ret = -ENOPROTOOPT; |
| 1008 | break; |
| 1009 | } |
| 1010 | return ret; |
| 1011 | } |
| 1012 | |
| 1013 | static inline int |
| 1014 | compat_calc_match(struct ipt_entry_match *m, int * size) |
| 1015 | { |
| 1016 | if (m->u.kernel.match->compat) |
| 1017 | m->u.kernel.match->compat(m, NULL, size, COMPAT_CALC_SIZE); |
| 1018 | else |
| 1019 | xt_compat_match(m, NULL, size, COMPAT_CALC_SIZE); |
| 1020 | return 0; |
| 1021 | } |
| 1022 | |
| 1023 | static int compat_calc_entry(struct ipt_entry *e, struct xt_table_info *info, |
| 1024 | void *base, struct xt_table_info *newinfo) |
| 1025 | { |
| 1026 | struct ipt_entry_target *t; |
| 1027 | u_int16_t entry_offset; |
| 1028 | int off, i, ret; |
| 1029 | |
| 1030 | off = 0; |
| 1031 | entry_offset = (void *)e - base; |
| 1032 | IPT_MATCH_ITERATE(e, compat_calc_match, &off); |
| 1033 | t = ipt_get_target(e); |
| 1034 | if (t->u.kernel.target->compat) |
| 1035 | t->u.kernel.target->compat(t, NULL, &off, COMPAT_CALC_SIZE); |
| 1036 | else |
| 1037 | xt_compat_target(t, NULL, &off, COMPAT_CALC_SIZE); |
| 1038 | newinfo->size -= off; |
| 1039 | ret = compat_add_offset(entry_offset, off); |
| 1040 | if (ret) |
| 1041 | return ret; |
| 1042 | |
| 1043 | for (i = 0; i< NF_IP_NUMHOOKS; i++) { |
| 1044 | if (info->hook_entry[i] && (e < (struct ipt_entry *) |
| 1045 | (base + info->hook_entry[i]))) |
| 1046 | newinfo->hook_entry[i] -= off; |
| 1047 | if (info->underflow[i] && (e < (struct ipt_entry *) |
| 1048 | (base + info->underflow[i]))) |
| 1049 | newinfo->underflow[i] -= off; |
| 1050 | } |
| 1051 | return 0; |
| 1052 | } |
| 1053 | |
| 1054 | static int compat_table_info(struct xt_table_info *info, |
| 1055 | struct xt_table_info *newinfo) |
| 1056 | { |
| 1057 | void *loc_cpu_entry; |
| 1058 | int i; |
| 1059 | |
| 1060 | if (!newinfo || !info) |
| 1061 | return -EINVAL; |
| 1062 | |
| 1063 | memset(newinfo, 0, sizeof(struct xt_table_info)); |
| 1064 | newinfo->size = info->size; |
| 1065 | newinfo->number = info->number; |
| 1066 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { |
| 1067 | newinfo->hook_entry[i] = info->hook_entry[i]; |
| 1068 | newinfo->underflow[i] = info->underflow[i]; |
| 1069 | } |
| 1070 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; |
| 1071 | return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, |
| 1072 | compat_calc_entry, info, loc_cpu_entry, newinfo); |
| 1073 | } |
| 1074 | #endif |
| 1075 | |
| 1076 | static int get_info(void __user *user, int *len, int compat) |
| 1077 | { |
| 1078 | char name[IPT_TABLE_MAXNAMELEN]; |
| 1079 | struct ipt_table *t; |
| 1080 | int ret; |
| 1081 | |
| 1082 | if (*len != sizeof(struct ipt_getinfo)) { |
| 1083 | duprintf("length %u != %u\n", *len, |
| 1084 | (unsigned int)sizeof(struct ipt_getinfo)); |
| 1085 | return -EINVAL; |
| 1086 | } |
| 1087 | |
| 1088 | if (copy_from_user(name, user, sizeof(name)) != 0) |
| 1089 | return -EFAULT; |
| 1090 | |
| 1091 | name[IPT_TABLE_MAXNAMELEN-1] = '\0'; |
| 1092 | #ifdef CONFIG_COMPAT |
| 1093 | if (compat) |
| 1094 | xt_compat_lock(AF_INET); |
| 1095 | #endif |
| 1096 | t = try_then_request_module(xt_find_table_lock(AF_INET, name), |
| 1097 | "iptable_%s", name); |
| 1098 | if (t && !IS_ERR(t)) { |
| 1099 | struct ipt_getinfo info; |
| 1100 | struct xt_table_info *private = t->private; |
| 1101 | |
| 1102 | #ifdef CONFIG_COMPAT |
| 1103 | if (compat) { |
| 1104 | struct xt_table_info tmp; |
| 1105 | ret = compat_table_info(private, &tmp); |
| 1106 | compat_flush_offsets(); |
| 1107 | private = &tmp; |
| 1108 | } |
| 1109 | #endif |
| 1110 | info.valid_hooks = t->valid_hooks; |
| 1111 | memcpy(info.hook_entry, private->hook_entry, |
| 1112 | sizeof(info.hook_entry)); |
| 1113 | memcpy(info.underflow, private->underflow, |
| 1114 | sizeof(info.underflow)); |
| 1115 | info.num_entries = private->number; |
| 1116 | info.size = private->size; |
| 1117 | strcpy(info.name, name); |
| 1118 | |
| 1119 | if (copy_to_user(user, &info, *len) != 0) |
| 1120 | ret = -EFAULT; |
| 1121 | else |
| 1122 | ret = 0; |
| 1123 | |
| 1124 | xt_table_unlock(t); |
| 1125 | module_put(t->me); |
| 1126 | } else |
| 1127 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1128 | #ifdef CONFIG_COMPAT |
| 1129 | if (compat) |
| 1130 | xt_compat_unlock(AF_INET); |
| 1131 | #endif |
| 1132 | return ret; |
| 1133 | } |
| 1134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | static int |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1136 | get_entries(struct ipt_get_entries __user *uptr, int *len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | { |
| 1138 | int ret; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1139 | struct ipt_get_entries get; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | struct ipt_table *t; |
| 1141 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1142 | if (*len < sizeof(get)) { |
| 1143 | duprintf("get_entries: %u < %d\n", *len, |
| 1144 | (unsigned int)sizeof(get)); |
| 1145 | return -EINVAL; |
| 1146 | } |
| 1147 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1148 | return -EFAULT; |
| 1149 | if (*len != sizeof(struct ipt_get_entries) + get.size) { |
| 1150 | duprintf("get_entries: %u != %u\n", *len, |
| 1151 | (unsigned int)(sizeof(struct ipt_get_entries) + |
| 1152 | get.size)); |
| 1153 | return -EINVAL; |
| 1154 | } |
| 1155 | |
| 1156 | t = xt_find_table_lock(AF_INET, get.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | if (t && !IS_ERR(t)) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1158 | struct xt_table_info *private = t->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | duprintf("t->private->number = %u\n", |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1160 | private->number); |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1161 | if (get.size == private->size) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1162 | ret = copy_entries_to_user(private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | t, uptr->entrytable); |
| 1164 | else { |
| 1165 | duprintf("get_entries: I've got %u not %u!\n", |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1166 | private->size, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1167 | get.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | ret = -EINVAL; |
| 1169 | } |
| 1170 | module_put(t->me); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1171 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | } else |
| 1173 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1174 | |
| 1175 | return ret; |
| 1176 | } |
| 1177 | |
| 1178 | static int |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1179 | __do_replace(const char *name, unsigned int valid_hooks, |
| 1180 | struct xt_table_info *newinfo, unsigned int num_counters, |
| 1181 | void __user *counters_ptr) |
| 1182 | { |
| 1183 | int ret; |
| 1184 | struct ipt_table *t; |
| 1185 | struct xt_table_info *oldinfo; |
| 1186 | struct xt_counters *counters; |
| 1187 | void *loc_cpu_old_entry; |
| 1188 | |
| 1189 | ret = 0; |
| 1190 | counters = vmalloc(num_counters * sizeof(struct xt_counters)); |
| 1191 | if (!counters) { |
| 1192 | ret = -ENOMEM; |
| 1193 | goto out; |
| 1194 | } |
| 1195 | |
| 1196 | t = try_then_request_module(xt_find_table_lock(AF_INET, name), |
| 1197 | "iptable_%s", name); |
| 1198 | if (!t || IS_ERR(t)) { |
| 1199 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1200 | goto free_newinfo_counters_untrans; |
| 1201 | } |
| 1202 | |
| 1203 | /* You lied! */ |
| 1204 | if (valid_hooks != t->valid_hooks) { |
| 1205 | duprintf("Valid hook crap: %08X vs %08X\n", |
| 1206 | valid_hooks, t->valid_hooks); |
| 1207 | ret = -EINVAL; |
| 1208 | goto put_module; |
| 1209 | } |
| 1210 | |
| 1211 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
| 1212 | if (!oldinfo) |
| 1213 | goto put_module; |
| 1214 | |
| 1215 | /* Update module usage count based on number of rules */ |
| 1216 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", |
| 1217 | oldinfo->number, oldinfo->initial_entries, newinfo->number); |
| 1218 | if ((oldinfo->number > oldinfo->initial_entries) || |
| 1219 | (newinfo->number <= oldinfo->initial_entries)) |
| 1220 | module_put(t->me); |
| 1221 | if ((oldinfo->number > oldinfo->initial_entries) && |
| 1222 | (newinfo->number <= oldinfo->initial_entries)) |
| 1223 | module_put(t->me); |
| 1224 | |
| 1225 | /* Get the old counters. */ |
| 1226 | get_counters(oldinfo, counters); |
| 1227 | /* Decrease module usage counts and free resource */ |
| 1228 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
| 1229 | IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); |
| 1230 | xt_free_table_info(oldinfo); |
| 1231 | if (copy_to_user(counters_ptr, counters, |
| 1232 | sizeof(struct xt_counters) * num_counters) != 0) |
| 1233 | ret = -EFAULT; |
| 1234 | vfree(counters); |
| 1235 | xt_table_unlock(t); |
| 1236 | return ret; |
| 1237 | |
| 1238 | put_module: |
| 1239 | module_put(t->me); |
| 1240 | xt_table_unlock(t); |
| 1241 | free_newinfo_counters_untrans: |
| 1242 | vfree(counters); |
| 1243 | out: |
| 1244 | return ret; |
| 1245 | } |
| 1246 | |
| 1247 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | do_replace(void __user *user, unsigned int len) |
| 1249 | { |
| 1250 | int ret; |
| 1251 | struct ipt_replace tmp; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1252 | struct xt_table_info *newinfo; |
| 1253 | void *loc_cpu_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | |
| 1255 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1256 | return -EFAULT; |
| 1257 | |
| 1258 | /* Hack: Causes ipchains to give correct error msg --RR */ |
| 1259 | if (len != sizeof(tmp) + tmp.size) |
| 1260 | return -ENOPROTOOPT; |
| 1261 | |
Kirill Korotaev | ee4bb81 | 2006-02-04 02:16:56 -0800 | [diff] [blame] | 1262 | /* overflow check */ |
| 1263 | if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - |
| 1264 | SMP_CACHE_BYTES) |
| 1265 | return -ENOMEM; |
| 1266 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1267 | return -ENOMEM; |
| 1268 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1269 | newinfo = xt_alloc_table_info(tmp.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | if (!newinfo) |
| 1271 | return -ENOMEM; |
| 1272 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1273 | /* choose the copy that is our node/cpu */ |
| 1274 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 1275 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | tmp.size) != 0) { |
| 1277 | ret = -EFAULT; |
| 1278 | goto free_newinfo; |
| 1279 | } |
| 1280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | ret = translate_table(tmp.name, tmp.valid_hooks, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1282 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | tmp.hook_entry, tmp.underflow); |
| 1284 | if (ret != 0) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1285 | goto free_newinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | |
| 1287 | duprintf("ip_tables: Translated table\n"); |
| 1288 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1289 | ret = __do_replace(tmp.name, tmp.valid_hooks, |
| 1290 | newinfo, tmp.num_counters, |
| 1291 | tmp.counters); |
| 1292 | if (ret) |
| 1293 | goto free_newinfo_untrans; |
| 1294 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1296 | free_newinfo_untrans: |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1297 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | free_newinfo: |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1299 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | return ret; |
| 1301 | } |
| 1302 | |
| 1303 | /* We're lazy, and add to the first CPU; overflow works its fey magic |
| 1304 | * and everything is OK. */ |
| 1305 | static inline int |
| 1306 | add_counter_to_entry(struct ipt_entry *e, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1307 | const struct xt_counters addme[], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | unsigned int *i) |
| 1309 | { |
| 1310 | #if 0 |
| 1311 | duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n", |
| 1312 | *i, |
| 1313 | (long unsigned int)e->counters.pcnt, |
| 1314 | (long unsigned int)e->counters.bcnt, |
| 1315 | (long unsigned int)addme[*i].pcnt, |
| 1316 | (long unsigned int)addme[*i].bcnt); |
| 1317 | #endif |
| 1318 | |
| 1319 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); |
| 1320 | |
| 1321 | (*i)++; |
| 1322 | return 0; |
| 1323 | } |
| 1324 | |
| 1325 | static int |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1326 | do_add_counters(void __user *user, unsigned int len, int compat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | { |
| 1328 | unsigned int i; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1329 | struct xt_counters_info tmp; |
| 1330 | struct xt_counters *paddc; |
| 1331 | unsigned int num_counters; |
| 1332 | char *name; |
| 1333 | int size; |
| 1334 | void *ptmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | struct ipt_table *t; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1336 | struct xt_table_info *private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | int ret = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1338 | void *loc_cpu_entry; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1339 | #ifdef CONFIG_COMPAT |
| 1340 | struct compat_xt_counters_info compat_tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1342 | if (compat) { |
| 1343 | ptmp = &compat_tmp; |
| 1344 | size = sizeof(struct compat_xt_counters_info); |
| 1345 | } else |
| 1346 | #endif |
| 1347 | { |
| 1348 | ptmp = &tmp; |
| 1349 | size = sizeof(struct xt_counters_info); |
| 1350 | } |
| 1351 | |
| 1352 | if (copy_from_user(ptmp, user, size) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | return -EFAULT; |
| 1354 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1355 | #ifdef CONFIG_COMPAT |
| 1356 | if (compat) { |
| 1357 | num_counters = compat_tmp.num_counters; |
| 1358 | name = compat_tmp.name; |
| 1359 | } else |
| 1360 | #endif |
| 1361 | { |
| 1362 | num_counters = tmp.num_counters; |
| 1363 | name = tmp.name; |
| 1364 | } |
| 1365 | |
| 1366 | if (len != size + num_counters * sizeof(struct xt_counters)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | return -EINVAL; |
| 1368 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1369 | paddc = vmalloc_node(len - size, numa_node_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | if (!paddc) |
| 1371 | return -ENOMEM; |
| 1372 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1373 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | ret = -EFAULT; |
| 1375 | goto free; |
| 1376 | } |
| 1377 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1378 | t = xt_find_table_lock(AF_INET, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | if (!t || IS_ERR(t)) { |
| 1380 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1381 | goto free; |
| 1382 | } |
| 1383 | |
| 1384 | write_lock_bh(&t->lock); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1385 | private = t->private; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1386 | if (private->number != num_counters) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | ret = -EINVAL; |
| 1388 | goto unlock_up_free; |
| 1389 | } |
| 1390 | |
| 1391 | i = 0; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1392 | /* Choose the copy that is on our node */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1393 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 1394 | IPT_ENTRY_ITERATE(loc_cpu_entry, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1395 | private->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | add_counter_to_entry, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1397 | paddc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | &i); |
| 1399 | unlock_up_free: |
| 1400 | write_unlock_bh(&t->lock); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1401 | xt_table_unlock(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | module_put(t->me); |
| 1403 | free: |
| 1404 | vfree(paddc); |
| 1405 | |
| 1406 | return ret; |
| 1407 | } |
| 1408 | |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1409 | #ifdef CONFIG_COMPAT |
| 1410 | struct compat_ipt_replace { |
| 1411 | char name[IPT_TABLE_MAXNAMELEN]; |
| 1412 | u32 valid_hooks; |
| 1413 | u32 num_entries; |
| 1414 | u32 size; |
| 1415 | u32 hook_entry[NF_IP_NUMHOOKS]; |
| 1416 | u32 underflow[NF_IP_NUMHOOKS]; |
| 1417 | u32 num_counters; |
| 1418 | compat_uptr_t counters; /* struct ipt_counters * */ |
| 1419 | struct compat_ipt_entry entries[0]; |
| 1420 | }; |
| 1421 | |
| 1422 | static inline int compat_copy_match_to_user(struct ipt_entry_match *m, |
| 1423 | void __user **dstptr, compat_uint_t *size) |
| 1424 | { |
| 1425 | if (m->u.kernel.match->compat) |
| 1426 | return m->u.kernel.match->compat(m, dstptr, size, |
| 1427 | COMPAT_TO_USER); |
| 1428 | else |
| 1429 | return xt_compat_match(m, dstptr, size, COMPAT_TO_USER); |
| 1430 | } |
| 1431 | |
| 1432 | static int compat_copy_entry_to_user(struct ipt_entry *e, |
| 1433 | void __user **dstptr, compat_uint_t *size) |
| 1434 | { |
| 1435 | struct ipt_entry_target __user *t; |
| 1436 | struct compat_ipt_entry __user *ce; |
| 1437 | u_int16_t target_offset, next_offset; |
| 1438 | compat_uint_t origsize; |
| 1439 | int ret; |
| 1440 | |
| 1441 | ret = -EFAULT; |
| 1442 | origsize = *size; |
| 1443 | ce = (struct compat_ipt_entry __user *)*dstptr; |
Patrick McHardy | 7800007 | 2006-05-03 23:20:27 -0700 | [diff] [blame] | 1444 | if (copy_to_user(ce, e, sizeof(struct ipt_entry))) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1445 | goto out; |
| 1446 | |
| 1447 | *dstptr += sizeof(struct compat_ipt_entry); |
| 1448 | ret = IPT_MATCH_ITERATE(e, compat_copy_match_to_user, dstptr, size); |
| 1449 | target_offset = e->target_offset - (origsize - *size); |
| 1450 | if (ret) |
| 1451 | goto out; |
| 1452 | t = ipt_get_target(e); |
| 1453 | if (t->u.kernel.target->compat) |
| 1454 | ret = t->u.kernel.target->compat(t, dstptr, size, |
| 1455 | COMPAT_TO_USER); |
| 1456 | else |
| 1457 | ret = xt_compat_target(t, dstptr, size, COMPAT_TO_USER); |
| 1458 | if (ret) |
| 1459 | goto out; |
| 1460 | ret = -EFAULT; |
| 1461 | next_offset = e->next_offset - (origsize - *size); |
Patrick McHardy | 7800007 | 2006-05-03 23:20:27 -0700 | [diff] [blame] | 1462 | if (put_user(target_offset, &ce->target_offset)) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1463 | goto out; |
Patrick McHardy | 7800007 | 2006-05-03 23:20:27 -0700 | [diff] [blame] | 1464 | if (put_user(next_offset, &ce->next_offset)) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 1465 | goto out; |
| 1466 | return 0; |
| 1467 | out: |
| 1468 | return ret; |
| 1469 | } |
| 1470 | |
| 1471 | static inline int |
| 1472 | compat_check_calc_match(struct ipt_entry_match *m, |
| 1473 | const char *name, |
| 1474 | const struct ipt_ip *ip, |
| 1475 | unsigned int hookmask, |
| 1476 | int *size, int *i) |
| 1477 | { |
| 1478 | struct ipt_match *match; |
| 1479 | |
| 1480 | match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, |
| 1481 | m->u.user.revision), |
| 1482 | "ipt_%s", m->u.user.name); |
| 1483 | if (IS_ERR(match) || !match) { |
| 1484 | duprintf("compat_check_calc_match: `%s' not found\n", |
| 1485 | m->u.user.name); |
| 1486 | return match ? PTR_ERR(match) : -ENOENT; |
| 1487 | } |
| 1488 | m->u.kernel.match = match; |
| 1489 | |
| 1490 | if (m->u.kernel.match->compat) |
| 1491 | m->u.kernel.match->compat(m, NULL, size, COMPAT_CALC_SIZE); |
| 1492 | else |
| 1493 | xt_compat_match(m, NULL, size, COMPAT_CALC_SIZE); |
| 1494 | |
| 1495 | (*i)++; |
| 1496 | return 0; |
| 1497 | } |
| 1498 | |
| 1499 | static inline int |
| 1500 | check_compat_entry_size_and_hooks(struct ipt_entry *e, |
| 1501 | struct xt_table_info *newinfo, |
| 1502 | unsigned int *size, |
| 1503 | unsigned char *base, |
| 1504 | unsigned char *limit, |
| 1505 | unsigned int *hook_entries, |
| 1506 | unsigned int *underflows, |
| 1507 | unsigned int *i, |
| 1508 | const char *name) |
| 1509 | { |
| 1510 | struct ipt_entry_target *t; |
| 1511 | struct ipt_target *target; |
| 1512 | u_int16_t entry_offset; |
| 1513 | int ret, off, h, j; |
| 1514 | |
| 1515 | duprintf("check_compat_entry_size_and_hooks %p\n", e); |
| 1516 | if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 |
| 1517 | || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { |
| 1518 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
| 1519 | return -EINVAL; |
| 1520 | } |
| 1521 | |
| 1522 | if (e->next_offset < sizeof(struct compat_ipt_entry) + |
| 1523 | sizeof(struct compat_xt_entry_target)) { |
| 1524 | duprintf("checking: element %p size %u\n", |
| 1525 | e, e->next_offset); |
| 1526 | return -EINVAL; |
| 1527 | } |
| 1528 | |
| 1529 | if (!ip_checkentry(&e->ip)) { |
| 1530 | duprintf("ip_tables: ip check failed %p %s.\n", e, name); |
| 1531 | return -EINVAL; |
| 1532 | } |
| 1533 | |
| 1534 | off = 0; |
| 1535 | entry_offset = (void *)e - (void *)base; |
| 1536 | j = 0; |
| 1537 | ret = IPT_MATCH_ITERATE(e, compat_check_calc_match, name, &e->ip, |
| 1538 | e->comefrom, &off, &j); |
| 1539 | if (ret != 0) |
| 1540 | goto out; |
| 1541 | |
| 1542 | t = ipt_get_target(e); |
| 1543 | target = try_then_request_module(xt_find_target(AF_INET, |
| 1544 | t->u.user.name, |
| 1545 | t->u.user.revision), |
| 1546 | "ipt_%s", t->u.user.name); |
| 1547 | if (IS_ERR(target) || !target) { |
| 1548 | duprintf("check_entry: `%s' not found\n", t->u.user.name); |
| 1549 | ret = target ? PTR_ERR(target) : -ENOENT; |
| 1550 | goto out; |
| 1551 | } |
| 1552 | t->u.kernel.target = target; |
| 1553 | |
| 1554 | if (t->u.kernel.target->compat) |
| 1555 | t->u.kernel.target->compat(t, NULL, &off, COMPAT_CALC_SIZE); |
| 1556 | else |
| 1557 | xt_compat_target(t, NULL, &off, COMPAT_CALC_SIZE); |
| 1558 | *size += off; |
| 1559 | ret = compat_add_offset(entry_offset, off); |
| 1560 | if (ret) |
| 1561 | goto out; |
| 1562 | |
| 1563 | /* Check hooks & underflows */ |
| 1564 | for (h = 0; h < NF_IP_NUMHOOKS; h++) { |
| 1565 | if ((unsigned char *)e - base == hook_entries[h]) |
| 1566 | newinfo->hook_entry[h] = hook_entries[h]; |
| 1567 | if ((unsigned char *)e - base == underflows[h]) |
| 1568 | newinfo->underflow[h] = underflows[h]; |
| 1569 | } |
| 1570 | |
| 1571 | /* Clear counters and comefrom */ |
| 1572 | e->counters = ((struct ipt_counters) { 0, 0 }); |
| 1573 | e->comefrom = 0; |
| 1574 | |
| 1575 | (*i)++; |
| 1576 | return 0; |
| 1577 | out: |
| 1578 | IPT_MATCH_ITERATE(e, cleanup_match, &j); |
| 1579 | return ret; |
| 1580 | } |
| 1581 | |
| 1582 | static inline int compat_copy_match_from_user(struct ipt_entry_match *m, |
| 1583 | void **dstptr, compat_uint_t *size, const char *name, |
| 1584 | const struct ipt_ip *ip, unsigned int hookmask) |
| 1585 | { |
| 1586 | struct ipt_entry_match *dm; |
| 1587 | struct ipt_match *match; |
| 1588 | int ret; |
| 1589 | |
| 1590 | dm = (struct ipt_entry_match *)*dstptr; |
| 1591 | match = m->u.kernel.match; |
| 1592 | if (match->compat) |
| 1593 | match->compat(m, dstptr, size, COMPAT_FROM_USER); |
| 1594 | else |
| 1595 | xt_compat_match(m, dstptr, size, COMPAT_FROM_USER); |
| 1596 | |
| 1597 | ret = xt_check_match(match, AF_INET, dm->u.match_size - sizeof(*dm), |
| 1598 | name, hookmask, ip->proto, |
| 1599 | ip->invflags & IPT_INV_PROTO); |
| 1600 | if (ret) |
| 1601 | return ret; |
| 1602 | |
| 1603 | if (m->u.kernel.match->checkentry |
| 1604 | && !m->u.kernel.match->checkentry(name, ip, match, dm->data, |
| 1605 | dm->u.match_size - sizeof(*dm), |
| 1606 | hookmask)) { |
| 1607 | duprintf("ip_tables: check failed for `%s'.\n", |
| 1608 | m->u.kernel.match->name); |
| 1609 | return -EINVAL; |
| 1610 | } |
| 1611 | return 0; |
| 1612 | } |
| 1613 | |
| 1614 | static int compat_copy_entry_from_user(struct ipt_entry *e, void **dstptr, |
| 1615 | unsigned int *size, const char *name, |
| 1616 | struct xt_table_info *newinfo, unsigned char *base) |
| 1617 | { |
| 1618 | struct ipt_entry_target *t; |
| 1619 | struct ipt_target *target; |
| 1620 | struct ipt_entry *de; |
| 1621 | unsigned int origsize; |
| 1622 | int ret, h; |
| 1623 | |
| 1624 | ret = 0; |
| 1625 | origsize = *size; |
| 1626 | de = (struct ipt_entry *)*dstptr; |
| 1627 | memcpy(de, e, sizeof(struct ipt_entry)); |
| 1628 | |
| 1629 | *dstptr += sizeof(struct compat_ipt_entry); |
| 1630 | ret = IPT_MATCH_ITERATE(e, compat_copy_match_from_user, dstptr, size, |
| 1631 | name, &de->ip, de->comefrom); |
| 1632 | if (ret) |
| 1633 | goto out; |
| 1634 | de->target_offset = e->target_offset - (origsize - *size); |
| 1635 | t = ipt_get_target(e); |
| 1636 | target = t->u.kernel.target; |
| 1637 | if (target->compat) |
| 1638 | target->compat(t, dstptr, size, COMPAT_FROM_USER); |
| 1639 | else |
| 1640 | xt_compat_target(t, dstptr, size, COMPAT_FROM_USER); |
| 1641 | |
| 1642 | de->next_offset = e->next_offset - (origsize - *size); |
| 1643 | for (h = 0; h < NF_IP_NUMHOOKS; h++) { |
| 1644 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) |
| 1645 | newinfo->hook_entry[h] -= origsize - *size; |
| 1646 | if ((unsigned char *)de - base < newinfo->underflow[h]) |
| 1647 | newinfo->underflow[h] -= origsize - *size; |
| 1648 | } |
| 1649 | |
| 1650 | t = ipt_get_target(de); |
| 1651 | target = t->u.kernel.target; |
| 1652 | ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t), |
| 1653 | name, e->comefrom, e->ip.proto, |
| 1654 | e->ip.invflags & IPT_INV_PROTO); |
| 1655 | if (ret) |
| 1656 | goto out; |
| 1657 | |
| 1658 | ret = -EINVAL; |
| 1659 | if (t->u.kernel.target == &ipt_standard_target) { |
| 1660 | if (!standard_check(t, *size)) |
| 1661 | goto out; |
| 1662 | } else if (t->u.kernel.target->checkentry |
| 1663 | && !t->u.kernel.target->checkentry(name, de, target, |
| 1664 | t->data, t->u.target_size - sizeof(*t), |
| 1665 | de->comefrom)) { |
| 1666 | duprintf("ip_tables: compat: check failed for `%s'.\n", |
| 1667 | t->u.kernel.target->name); |
| 1668 | goto out; |
| 1669 | } |
| 1670 | ret = 0; |
| 1671 | out: |
| 1672 | return ret; |
| 1673 | } |
| 1674 | |
| 1675 | static int |
| 1676 | translate_compat_table(const char *name, |
| 1677 | unsigned int valid_hooks, |
| 1678 | struct xt_table_info **pinfo, |
| 1679 | void **pentry0, |
| 1680 | unsigned int total_size, |
| 1681 | unsigned int number, |
| 1682 | unsigned int *hook_entries, |
| 1683 | unsigned int *underflows) |
| 1684 | { |
| 1685 | unsigned int i; |
| 1686 | struct xt_table_info *newinfo, *info; |
| 1687 | void *pos, *entry0, *entry1; |
| 1688 | unsigned int size; |
| 1689 | int ret; |
| 1690 | |
| 1691 | info = *pinfo; |
| 1692 | entry0 = *pentry0; |
| 1693 | size = total_size; |
| 1694 | info->number = number; |
| 1695 | |
| 1696 | /* Init all hooks to impossible value. */ |
| 1697 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { |
| 1698 | info->hook_entry[i] = 0xFFFFFFFF; |
| 1699 | info->underflow[i] = 0xFFFFFFFF; |
| 1700 | } |
| 1701 | |
| 1702 | duprintf("translate_compat_table: size %u\n", info->size); |
| 1703 | i = 0; |
| 1704 | xt_compat_lock(AF_INET); |
| 1705 | /* Walk through entries, checking offsets. */ |
| 1706 | ret = IPT_ENTRY_ITERATE(entry0, total_size, |
| 1707 | check_compat_entry_size_and_hooks, |
| 1708 | info, &size, entry0, |
| 1709 | entry0 + total_size, |
| 1710 | hook_entries, underflows, &i, name); |
| 1711 | if (ret != 0) |
| 1712 | goto out_unlock; |
| 1713 | |
| 1714 | ret = -EINVAL; |
| 1715 | if (i != number) { |
| 1716 | duprintf("translate_compat_table: %u not %u entries\n", |
| 1717 | i, number); |
| 1718 | goto out_unlock; |
| 1719 | } |
| 1720 | |
| 1721 | /* Check hooks all assigned */ |
| 1722 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { |
| 1723 | /* Only hooks which are valid */ |
| 1724 | if (!(valid_hooks & (1 << i))) |
| 1725 | continue; |
| 1726 | if (info->hook_entry[i] == 0xFFFFFFFF) { |
| 1727 | duprintf("Invalid hook entry %u %u\n", |
| 1728 | i, hook_entries[i]); |
| 1729 | goto out_unlock; |
| 1730 | } |
| 1731 | if (info->underflow[i] == 0xFFFFFFFF) { |
| 1732 | duprintf("Invalid underflow %u %u\n", |
| 1733 | i, underflows[i]); |
| 1734 | goto out_unlock; |
| 1735 | } |
| 1736 | } |
| 1737 | |
| 1738 | ret = -ENOMEM; |
| 1739 | newinfo = xt_alloc_table_info(size); |
| 1740 | if (!newinfo) |
| 1741 | goto out_unlock; |
| 1742 | |
| 1743 | newinfo->number = number; |
| 1744 | for (i = 0; i < NF_IP_NUMHOOKS; i++) { |
| 1745 | newinfo->hook_entry[i] = info->hook_entry[i]; |
| 1746 | newinfo->underflow[i] = info->underflow[i]; |
| 1747 | } |
| 1748 | entry1 = newinfo->entries[raw_smp_processor_id()]; |
| 1749 | pos = entry1; |
| 1750 | size = total_size; |
| 1751 | ret = IPT_ENTRY_ITERATE(entry0, total_size, |
| 1752 | compat_copy_entry_from_user, &pos, &size, |
| 1753 | name, newinfo, entry1); |
| 1754 | compat_flush_offsets(); |
| 1755 | xt_compat_unlock(AF_INET); |
| 1756 | if (ret) |
| 1757 | goto free_newinfo; |
| 1758 | |
| 1759 | ret = -ELOOP; |
| 1760 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) |
| 1761 | goto free_newinfo; |
| 1762 | |
| 1763 | /* And one copy for every other CPU */ |
| 1764 | for_each_cpu(i) |
| 1765 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) |
| 1766 | memcpy(newinfo->entries[i], entry1, newinfo->size); |
| 1767 | |
| 1768 | *pinfo = newinfo; |
| 1769 | *pentry0 = entry1; |
| 1770 | xt_free_table_info(info); |
| 1771 | return 0; |
| 1772 | |
| 1773 | free_newinfo: |
| 1774 | xt_free_table_info(newinfo); |
| 1775 | out: |
| 1776 | return ret; |
| 1777 | out_unlock: |
| 1778 | xt_compat_unlock(AF_INET); |
| 1779 | goto out; |
| 1780 | } |
| 1781 | |
| 1782 | static int |
| 1783 | compat_do_replace(void __user *user, unsigned int len) |
| 1784 | { |
| 1785 | int ret; |
| 1786 | struct compat_ipt_replace tmp; |
| 1787 | struct xt_table_info *newinfo; |
| 1788 | void *loc_cpu_entry; |
| 1789 | |
| 1790 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1791 | return -EFAULT; |
| 1792 | |
| 1793 | /* Hack: Causes ipchains to give correct error msg --RR */ |
| 1794 | if (len != sizeof(tmp) + tmp.size) |
| 1795 | return -ENOPROTOOPT; |
| 1796 | |
| 1797 | /* overflow check */ |
| 1798 | if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - |
| 1799 | SMP_CACHE_BYTES) |
| 1800 | return -ENOMEM; |
| 1801 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) |
| 1802 | return -ENOMEM; |
| 1803 | |
| 1804 | newinfo = xt_alloc_table_info(tmp.size); |
| 1805 | if (!newinfo) |
| 1806 | return -ENOMEM; |
| 1807 | |
| 1808 | /* choose the copy that is our node/cpu */ |
| 1809 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 1810 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
| 1811 | tmp.size) != 0) { |
| 1812 | ret = -EFAULT; |
| 1813 | goto free_newinfo; |
| 1814 | } |
| 1815 | |
| 1816 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, |
| 1817 | &newinfo, &loc_cpu_entry, tmp.size, |
| 1818 | tmp.num_entries, tmp.hook_entry, tmp.underflow); |
| 1819 | if (ret != 0) |
| 1820 | goto free_newinfo; |
| 1821 | |
| 1822 | duprintf("compat_do_replace: Translated table\n"); |
| 1823 | |
| 1824 | ret = __do_replace(tmp.name, tmp.valid_hooks, |
| 1825 | newinfo, tmp.num_counters, |
| 1826 | compat_ptr(tmp.counters)); |
| 1827 | if (ret) |
| 1828 | goto free_newinfo_untrans; |
| 1829 | return 0; |
| 1830 | |
| 1831 | free_newinfo_untrans: |
| 1832 | IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); |
| 1833 | free_newinfo: |
| 1834 | xt_free_table_info(newinfo); |
| 1835 | return ret; |
| 1836 | } |
| 1837 | |
| 1838 | static int |
| 1839 | compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, |
| 1840 | unsigned int len) |
| 1841 | { |
| 1842 | int ret; |
| 1843 | |
| 1844 | if (!capable(CAP_NET_ADMIN)) |
| 1845 | return -EPERM; |
| 1846 | |
| 1847 | switch (cmd) { |
| 1848 | case IPT_SO_SET_REPLACE: |
| 1849 | ret = compat_do_replace(user, len); |
| 1850 | break; |
| 1851 | |
| 1852 | case IPT_SO_SET_ADD_COUNTERS: |
| 1853 | ret = do_add_counters(user, len, 1); |
| 1854 | break; |
| 1855 | |
| 1856 | default: |
| 1857 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); |
| 1858 | ret = -EINVAL; |
| 1859 | } |
| 1860 | |
| 1861 | return ret; |
| 1862 | } |
| 1863 | |
| 1864 | struct compat_ipt_get_entries |
| 1865 | { |
| 1866 | char name[IPT_TABLE_MAXNAMELEN]; |
| 1867 | compat_uint_t size; |
| 1868 | struct compat_ipt_entry entrytable[0]; |
| 1869 | }; |
| 1870 | |
| 1871 | static int compat_copy_entries_to_user(unsigned int total_size, |
| 1872 | struct ipt_table *table, void __user *userptr) |
| 1873 | { |
| 1874 | unsigned int off, num; |
| 1875 | struct compat_ipt_entry e; |
| 1876 | struct xt_counters *counters; |
| 1877 | struct xt_table_info *private = table->private; |
| 1878 | void __user *pos; |
| 1879 | unsigned int size; |
| 1880 | int ret = 0; |
| 1881 | void *loc_cpu_entry; |
| 1882 | |
| 1883 | counters = alloc_counters(table); |
| 1884 | if (IS_ERR(counters)) |
| 1885 | return PTR_ERR(counters); |
| 1886 | |
| 1887 | /* choose the copy that is on our node/cpu, ... |
| 1888 | * This choice is lazy (because current thread is |
| 1889 | * allowed to migrate to another cpu) |
| 1890 | */ |
| 1891 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
| 1892 | pos = userptr; |
| 1893 | size = total_size; |
| 1894 | ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size, |
| 1895 | compat_copy_entry_to_user, &pos, &size); |
| 1896 | if (ret) |
| 1897 | goto free_counters; |
| 1898 | |
| 1899 | /* ... then go back and fix counters and names */ |
| 1900 | for (off = 0, num = 0; off < size; off += e.next_offset, num++) { |
| 1901 | unsigned int i; |
| 1902 | struct ipt_entry_match m; |
| 1903 | struct ipt_entry_target t; |
| 1904 | |
| 1905 | ret = -EFAULT; |
| 1906 | if (copy_from_user(&e, userptr + off, |
| 1907 | sizeof(struct compat_ipt_entry))) |
| 1908 | goto free_counters; |
| 1909 | if (copy_to_user(userptr + off + |
| 1910 | offsetof(struct compat_ipt_entry, counters), |
| 1911 | &counters[num], sizeof(counters[num]))) |
| 1912 | goto free_counters; |
| 1913 | |
| 1914 | for (i = sizeof(struct compat_ipt_entry); |
| 1915 | i < e.target_offset; i += m.u.match_size) { |
| 1916 | if (copy_from_user(&m, userptr + off + i, |
| 1917 | sizeof(struct ipt_entry_match))) |
| 1918 | goto free_counters; |
| 1919 | if (copy_to_user(userptr + off + i + |
| 1920 | offsetof(struct ipt_entry_match, u.user.name), |
| 1921 | m.u.kernel.match->name, |
| 1922 | strlen(m.u.kernel.match->name) + 1)) |
| 1923 | goto free_counters; |
| 1924 | } |
| 1925 | |
| 1926 | if (copy_from_user(&t, userptr + off + e.target_offset, |
| 1927 | sizeof(struct ipt_entry_target))) |
| 1928 | goto free_counters; |
| 1929 | if (copy_to_user(userptr + off + e.target_offset + |
| 1930 | offsetof(struct ipt_entry_target, u.user.name), |
| 1931 | t.u.kernel.target->name, |
| 1932 | strlen(t.u.kernel.target->name) + 1)) |
| 1933 | goto free_counters; |
| 1934 | } |
| 1935 | ret = 0; |
| 1936 | free_counters: |
| 1937 | vfree(counters); |
| 1938 | return ret; |
| 1939 | } |
| 1940 | |
| 1941 | static int |
| 1942 | compat_get_entries(struct compat_ipt_get_entries __user *uptr, int *len) |
| 1943 | { |
| 1944 | int ret; |
| 1945 | struct compat_ipt_get_entries get; |
| 1946 | struct ipt_table *t; |
| 1947 | |
| 1948 | |
| 1949 | if (*len < sizeof(get)) { |
| 1950 | duprintf("compat_get_entries: %u < %u\n", |
| 1951 | *len, (unsigned int)sizeof(get)); |
| 1952 | return -EINVAL; |
| 1953 | } |
| 1954 | |
| 1955 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) |
| 1956 | return -EFAULT; |
| 1957 | |
| 1958 | if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { |
| 1959 | duprintf("compat_get_entries: %u != %u\n", *len, |
| 1960 | (unsigned int)(sizeof(struct compat_ipt_get_entries) + |
| 1961 | get.size)); |
| 1962 | return -EINVAL; |
| 1963 | } |
| 1964 | |
| 1965 | xt_compat_lock(AF_INET); |
| 1966 | t = xt_find_table_lock(AF_INET, get.name); |
| 1967 | if (t && !IS_ERR(t)) { |
| 1968 | struct xt_table_info *private = t->private; |
| 1969 | struct xt_table_info info; |
| 1970 | duprintf("t->private->number = %u\n", |
| 1971 | private->number); |
| 1972 | ret = compat_table_info(private, &info); |
| 1973 | if (!ret && get.size == info.size) { |
| 1974 | ret = compat_copy_entries_to_user(private->size, |
| 1975 | t, uptr->entrytable); |
| 1976 | } else if (!ret) { |
| 1977 | duprintf("compat_get_entries: I've got %u not %u!\n", |
| 1978 | private->size, |
| 1979 | get.size); |
| 1980 | ret = -EINVAL; |
| 1981 | } |
| 1982 | compat_flush_offsets(); |
| 1983 | module_put(t->me); |
| 1984 | xt_table_unlock(t); |
| 1985 | } else |
| 1986 | ret = t ? PTR_ERR(t) : -ENOENT; |
| 1987 | |
| 1988 | xt_compat_unlock(AF_INET); |
| 1989 | return ret; |
| 1990 | } |
| 1991 | |
| 1992 | static int |
| 1993 | compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1994 | { |
| 1995 | int ret; |
| 1996 | |
| 1997 | switch (cmd) { |
| 1998 | case IPT_SO_GET_INFO: |
| 1999 | ret = get_info(user, len, 1); |
| 2000 | break; |
| 2001 | case IPT_SO_GET_ENTRIES: |
| 2002 | ret = compat_get_entries(user, len); |
| 2003 | break; |
| 2004 | default: |
| 2005 | duprintf("compat_do_ipt_get_ctl: unknown request %i\n", cmd); |
| 2006 | ret = -EINVAL; |
| 2007 | } |
| 2008 | return ret; |
| 2009 | } |
| 2010 | #endif |
| 2011 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | static int |
| 2013 | do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
| 2014 | { |
| 2015 | int ret; |
| 2016 | |
| 2017 | if (!capable(CAP_NET_ADMIN)) |
| 2018 | return -EPERM; |
| 2019 | |
| 2020 | switch (cmd) { |
| 2021 | case IPT_SO_SET_REPLACE: |
| 2022 | ret = do_replace(user, len); |
| 2023 | break; |
| 2024 | |
| 2025 | case IPT_SO_SET_ADD_COUNTERS: |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2026 | ret = do_add_counters(user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | break; |
| 2028 | |
| 2029 | default: |
| 2030 | duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); |
| 2031 | ret = -EINVAL; |
| 2032 | } |
| 2033 | |
| 2034 | return ret; |
| 2035 | } |
| 2036 | |
| 2037 | static int |
| 2038 | do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 2039 | { |
| 2040 | int ret; |
| 2041 | |
| 2042 | if (!capable(CAP_NET_ADMIN)) |
| 2043 | return -EPERM; |
| 2044 | |
| 2045 | switch (cmd) { |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2046 | case IPT_SO_GET_INFO: |
| 2047 | ret = get_info(user, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | break; |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2049 | |
| 2050 | case IPT_SO_GET_ENTRIES: |
| 2051 | ret = get_entries(user, len); |
| 2052 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2053 | |
| 2054 | case IPT_SO_GET_REVISION_MATCH: |
| 2055 | case IPT_SO_GET_REVISION_TARGET: { |
| 2056 | struct ipt_get_revision rev; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2057 | int target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | |
| 2059 | if (*len != sizeof(rev)) { |
| 2060 | ret = -EINVAL; |
| 2061 | break; |
| 2062 | } |
| 2063 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { |
| 2064 | ret = -EFAULT; |
| 2065 | break; |
| 2066 | } |
| 2067 | |
| 2068 | if (cmd == IPT_SO_GET_REVISION_TARGET) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2069 | target = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | else |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2071 | target = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2073 | try_then_request_module(xt_find_revision(AF_INET, rev.name, |
| 2074 | rev.revision, |
| 2075 | target, &ret), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | "ipt_%s", rev.name); |
| 2077 | break; |
| 2078 | } |
| 2079 | |
| 2080 | default: |
| 2081 | duprintf("do_ipt_get_ctl: unknown request %i\n", cmd); |
| 2082 | ret = -EINVAL; |
| 2083 | } |
| 2084 | |
| 2085 | return ret; |
| 2086 | } |
| 2087 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2088 | int ipt_register_table(struct xt_table *table, const struct ipt_replace *repl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | { |
| 2090 | int ret; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2091 | struct xt_table_info *newinfo; |
| 2092 | static struct xt_table_info bootstrap |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2094 | void *loc_cpu_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2096 | newinfo = xt_alloc_table_info(repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2097 | if (!newinfo) |
| 2098 | return -ENOMEM; |
| 2099 | |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2100 | /* choose the copy on our node/cpu |
| 2101 | * but dont care of preemption |
| 2102 | */ |
| 2103 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; |
| 2104 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | |
| 2106 | ret = translate_table(table->name, table->valid_hooks, |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2107 | newinfo, loc_cpu_entry, repl->size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | repl->num_entries, |
| 2109 | repl->hook_entry, |
| 2110 | repl->underflow); |
| 2111 | if (ret != 0) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2112 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2113 | return ret; |
| 2114 | } |
| 2115 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2116 | if (xt_register_table(table, &bootstrap, newinfo) != 0) { |
| 2117 | xt_free_table_info(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | return ret; |
| 2119 | } |
| 2120 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2121 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | } |
| 2123 | |
| 2124 | void ipt_unregister_table(struct ipt_table *table) |
| 2125 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2126 | struct xt_table_info *private; |
Eric Dumazet | 3183606 | 2005-12-13 23:13:48 -0800 | [diff] [blame] | 2127 | void *loc_cpu_entry; |
| 2128 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2129 | private = xt_unregister_table(table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | |
| 2131 | /* Decrease module usage counts and free resources */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2132 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
| 2133 | IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL); |
| 2134 | xt_free_table_info(private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | } |
| 2136 | |
| 2137 | /* Returns 1 if the type and code is matched by the range, 0 otherwise */ |
| 2138 | static inline int |
| 2139 | icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code, |
| 2140 | u_int8_t type, u_int8_t code, |
| 2141 | int invert) |
| 2142 | { |
| 2143 | return ((test_type == 0xFF) || (type == test_type && code >= min_code && code <= max_code)) |
| 2144 | ^ invert; |
| 2145 | } |
| 2146 | |
| 2147 | static int |
| 2148 | icmp_match(const struct sk_buff *skb, |
| 2149 | const struct net_device *in, |
| 2150 | const struct net_device *out, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame] | 2151 | const struct xt_match *match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | const void *matchinfo, |
| 2153 | int offset, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2154 | unsigned int protoff, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | int *hotdrop) |
| 2156 | { |
| 2157 | struct icmphdr _icmph, *ic; |
| 2158 | const struct ipt_icmp *icmpinfo = matchinfo; |
| 2159 | |
| 2160 | /* Must not be a fragment. */ |
| 2161 | if (offset) |
| 2162 | return 0; |
| 2163 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2164 | ic = skb_header_pointer(skb, protoff, sizeof(_icmph), &_icmph); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | if (ic == NULL) { |
| 2166 | /* We've been asked to examine this packet, and we |
| 2167 | * can't. Hence, no choice but to drop. |
| 2168 | */ |
| 2169 | duprintf("Dropping evil ICMP tinygram.\n"); |
| 2170 | *hotdrop = 1; |
| 2171 | return 0; |
| 2172 | } |
| 2173 | |
| 2174 | return icmp_type_code_match(icmpinfo->type, |
| 2175 | icmpinfo->code[0], |
| 2176 | icmpinfo->code[1], |
| 2177 | ic->type, ic->code, |
| 2178 | !!(icmpinfo->invflags&IPT_ICMP_INV)); |
| 2179 | } |
| 2180 | |
| 2181 | /* Called when user tries to insert an entry of this type. */ |
| 2182 | static int |
| 2183 | icmp_checkentry(const char *tablename, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2184 | const void *info, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame] | 2185 | const struct xt_match *match, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | void *matchinfo, |
| 2187 | unsigned int matchsize, |
| 2188 | unsigned int hook_mask) |
| 2189 | { |
| 2190 | const struct ipt_icmp *icmpinfo = matchinfo; |
| 2191 | |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2192 | /* Must specify no unknown invflags */ |
| 2193 | return !(icmpinfo->invflags & ~IPT_ICMP_INV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | } |
| 2195 | |
| 2196 | /* The built-in targets: standard (NULL) and error. */ |
| 2197 | static struct ipt_target ipt_standard_target = { |
| 2198 | .name = IPT_STANDARD_TARGET, |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2199 | .targetsize = sizeof(int), |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 2200 | .family = AF_INET, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2201 | #ifdef CONFIG_COMPAT |
| 2202 | .compat = &compat_ipt_standard_fn, |
| 2203 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | }; |
| 2205 | |
| 2206 | static struct ipt_target ipt_error_target = { |
| 2207 | .name = IPT_ERROR_TARGET, |
| 2208 | .target = ipt_error, |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2209 | .targetsize = IPT_FUNCTION_MAXNAMELEN, |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 2210 | .family = AF_INET, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | }; |
| 2212 | |
| 2213 | static struct nf_sockopt_ops ipt_sockopts = { |
| 2214 | .pf = PF_INET, |
| 2215 | .set_optmin = IPT_BASE_CTL, |
| 2216 | .set_optmax = IPT_SO_SET_MAX+1, |
| 2217 | .set = do_ipt_set_ctl, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2218 | #ifdef CONFIG_COMPAT |
| 2219 | .compat_set = compat_do_ipt_set_ctl, |
| 2220 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | .get_optmin = IPT_BASE_CTL, |
| 2222 | .get_optmax = IPT_SO_GET_MAX+1, |
| 2223 | .get = do_ipt_get_ctl, |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 2224 | #ifdef CONFIG_COMPAT |
| 2225 | .compat_get = compat_do_ipt_get_ctl, |
| 2226 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | }; |
| 2228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2229 | static struct ipt_match icmp_matchstruct = { |
| 2230 | .name = "icmp", |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2231 | .match = icmp_match, |
| 2232 | .matchsize = sizeof(struct ipt_icmp), |
| 2233 | .proto = IPPROTO_ICMP, |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 2234 | .family = AF_INET, |
Patrick McHardy | 1d5cd90 | 2006-03-20 18:01:14 -0800 | [diff] [blame] | 2235 | .checkentry = icmp_checkentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2236 | }; |
| 2237 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2238 | static int __init ip_tables_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | { |
| 2240 | int ret; |
| 2241 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2242 | xt_proto_init(AF_INET); |
| 2243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | /* Noone else will be downing sem now, so we won't sleep */ |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 2245 | xt_register_target(&ipt_standard_target); |
| 2246 | xt_register_target(&ipt_error_target); |
| 2247 | xt_register_match(&icmp_matchstruct); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | |
| 2249 | /* Register setsockopt */ |
| 2250 | ret = nf_register_sockopt(&ipt_sockopts); |
| 2251 | if (ret < 0) { |
| 2252 | duprintf("Unable to register sockopts.\n"); |
| 2253 | return ret; |
| 2254 | } |
| 2255 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2256 | printk("ip_tables: (C) 2000-2006 Netfilter Core Team\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2257 | return 0; |
| 2258 | } |
| 2259 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2260 | static void __exit ip_tables_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | { |
| 2262 | nf_unregister_sockopt(&ipt_sockopts); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2263 | |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 2264 | xt_unregister_match(&icmp_matchstruct); |
| 2265 | xt_unregister_target(&ipt_error_target); |
| 2266 | xt_unregister_target(&ipt_standard_target); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 2267 | |
| 2268 | xt_proto_fini(AF_INET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | } |
| 2270 | |
| 2271 | EXPORT_SYMBOL(ipt_register_table); |
| 2272 | EXPORT_SYMBOL(ipt_unregister_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | EXPORT_SYMBOL(ipt_do_table); |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 2274 | module_init(ip_tables_init); |
| 2275 | module_exit(ip_tables_fini); |