Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ebtables |
| 3 | * |
| 4 | * Author: |
| 5 | * Bart De Schuymer <bdschuym@pandora.be> |
| 6 | * |
| 7 | * ebtables.c,v 2.0, July, 2002 |
| 8 | * |
| 9 | * This code is stongly inspired on the iptables code which is |
| 10 | * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | */ |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | #include <linux/kmod.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/vmalloc.h> |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 22 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/netfilter_bridge/ebtables.h> |
| 24 | #include <linux/spinlock.h> |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 25 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/uaccess.h> |
| 27 | #include <linux/smp.h> |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 28 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <net/sock.h> |
| 30 | /* needed for logical [in,out]-dev filtering */ |
| 31 | #include "../br_private.h" |
| 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #define BUGPRINT(format, args...) printk("kernel msg: ebtables bug: please "\ |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 34 | "report to author: "format, ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | /* #define BUGPRINT(format, args...) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #define MEMPRINT(format, args...) printk("kernel msg: ebtables "\ |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 37 | ": out of memory: "format, ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | /* #define MEMPRINT(format, args...) */ |
| 39 | |
| 40 | |
| 41 | |
| 42 | /* |
| 43 | * Each cpu has its own set of counters, so there is no need for write_lock in |
| 44 | * the softirq |
| 45 | * For reading or updating the counters, the user context needs to |
| 46 | * get a write_lock |
| 47 | */ |
| 48 | |
| 49 | /* The size of each set of counters is altered to get cache alignment */ |
| 50 | #define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1)) |
| 51 | #define COUNTER_OFFSET(n) (SMP_ALIGN(n * sizeof(struct ebt_counter))) |
| 52 | #define COUNTER_BASE(c, n, cpu) ((struct ebt_counter *)(((char *)c) + \ |
| 53 | COUNTER_OFFSET(n) * cpu)) |
| 54 | |
| 55 | |
| 56 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 57 | static DEFINE_MUTEX(ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 59 | static struct xt_target ebt_standard_target = { |
Jan Engelhardt | 001a18d | 2008-10-08 11:35:14 +0200 | [diff] [blame] | 60 | .name = "standard", |
| 61 | .revision = 0, |
| 62 | .family = NFPROTO_BRIDGE, |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 63 | .targetsize = sizeof(int), |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 64 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 66 | static inline int |
| 67 | ebt_do_watcher(const struct ebt_entry_watcher *w, struct sk_buff *skb, |
| 68 | struct xt_target_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | { |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 70 | par->target = w->u.watcher; |
| 71 | par->targinfo = w->data; |
| 72 | w->u.watcher->target(skb, par); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | /* watchers don't give a verdict */ |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | static inline int ebt_do_match (struct ebt_entry_match *m, |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 78 | const struct sk_buff *skb, struct xt_match_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | { |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 80 | par->match = m->u.match; |
| 81 | par->matchinfo = m->data; |
Jan Engelhardt | d61ba9f | 2009-01-12 00:06:06 +0000 | [diff] [blame] | 82 | return m->u.match->match(skb, par) ? EBT_MATCH : EBT_NOMATCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | } |
| 84 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 85 | static inline int |
| 86 | ebt_dev_check(const char *entry, const struct net_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | { |
| 88 | int i = 0; |
Julia Lawall | f3d8b2e | 2009-01-09 10:22:22 +0000 | [diff] [blame] | 89 | const char *devname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
| 91 | if (*entry == '\0') |
| 92 | return 0; |
| 93 | if (!device) |
| 94 | return 1; |
Julia Lawall | f3d8b2e | 2009-01-09 10:22:22 +0000 | [diff] [blame] | 95 | devname = device->name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | /* 1 is the wildcard token */ |
| 97 | while (entry[i] != '\0' && entry[i] != 1 && entry[i] == devname[i]) |
| 98 | i++; |
| 99 | return (devname[i] != entry[i] && entry[i] != 1); |
| 100 | } |
| 101 | |
| 102 | #define FWINV2(bool,invflg) ((bool) ^ !!(e->invflags & invflg)) |
| 103 | /* process standard matches */ |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 104 | static inline int |
| 105 | ebt_basic_match(const struct ebt_entry *e, const struct ethhdr *h, |
| 106 | const struct net_device *in, const struct net_device *out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | { |
| 108 | int verdict, i; |
| 109 | |
| 110 | if (e->bitmask & EBT_802_3) { |
| 111 | if (FWINV2(ntohs(h->h_proto) >= 1536, EBT_IPROTO)) |
| 112 | return 1; |
| 113 | } else if (!(e->bitmask & EBT_NOPROTO) && |
| 114 | FWINV2(e->ethproto != h->h_proto, EBT_IPROTO)) |
| 115 | return 1; |
| 116 | |
| 117 | if (FWINV2(ebt_dev_check(e->in, in), EBT_IIN)) |
| 118 | return 1; |
| 119 | if (FWINV2(ebt_dev_check(e->out, out), EBT_IOUT)) |
| 120 | return 1; |
| 121 | if ((!in || !in->br_port) ? 0 : FWINV2(ebt_dev_check( |
| 122 | e->logical_in, in->br_port->br->dev), EBT_ILOGICALIN)) |
| 123 | return 1; |
| 124 | if ((!out || !out->br_port) ? 0 : FWINV2(ebt_dev_check( |
| 125 | e->logical_out, out->br_port->br->dev), EBT_ILOGICALOUT)) |
| 126 | return 1; |
| 127 | |
| 128 | if (e->bitmask & EBT_SOURCEMAC) { |
| 129 | verdict = 0; |
| 130 | for (i = 0; i < 6; i++) |
| 131 | verdict |= (h->h_source[i] ^ e->sourcemac[i]) & |
| 132 | e->sourcemsk[i]; |
| 133 | if (FWINV2(verdict != 0, EBT_ISOURCE) ) |
| 134 | return 1; |
| 135 | } |
| 136 | if (e->bitmask & EBT_DESTMAC) { |
| 137 | verdict = 0; |
| 138 | for (i = 0; i < 6; i++) |
| 139 | verdict |= (h->h_dest[i] ^ e->destmac[i]) & |
| 140 | e->destmsk[i]; |
| 141 | if (FWINV2(verdict != 0, EBT_IDEST) ) |
| 142 | return 1; |
| 143 | } |
| 144 | return 0; |
| 145 | } |
| 146 | |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 147 | static inline __pure |
| 148 | struct ebt_entry *ebt_next_entry(const struct ebt_entry *entry) |
| 149 | { |
| 150 | return (void *)entry + entry->next_offset; |
| 151 | } |
| 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | /* Do some firewalling */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 154 | unsigned int ebt_do_table (unsigned int hook, struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | const struct net_device *in, const struct net_device *out, |
| 156 | struct ebt_table *table) |
| 157 | { |
| 158 | int i, nentries; |
| 159 | struct ebt_entry *point; |
| 160 | struct ebt_counter *counter_base, *cb_base; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 161 | const struct ebt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | int verdict, sp = 0; |
| 163 | struct ebt_chainstack *cs; |
| 164 | struct ebt_entries *chaininfo; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 165 | const char *base; |
| 166 | const struct ebt_table_info *private; |
Jan Engelhardt | 5365f80 | 2008-10-08 11:35:16 +0200 | [diff] [blame] | 167 | bool hotdrop = false; |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 168 | struct xt_match_param mtpar; |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 169 | struct xt_target_param tgpar; |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 170 | |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 171 | mtpar.family = tgpar.family = NFPROTO_BRIDGE; |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 172 | mtpar.in = tgpar.in = in; |
| 173 | mtpar.out = tgpar.out = out; |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 174 | mtpar.hotdrop = &hotdrop; |
Evgeniy Polyakov | a5e7882 | 2009-06-04 16:54:42 +0200 | [diff] [blame] | 175 | mtpar.hooknum = tgpar.hooknum = hook; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
| 177 | read_lock_bh(&table->lock); |
| 178 | private = table->private; |
| 179 | cb_base = COUNTER_BASE(private->counters, private->nentries, |
| 180 | smp_processor_id()); |
| 181 | if (private->chainstack) |
| 182 | cs = private->chainstack[smp_processor_id()]; |
| 183 | else |
| 184 | cs = NULL; |
| 185 | chaininfo = private->hook_entry[hook]; |
| 186 | nentries = private->hook_entry[hook]->nentries; |
| 187 | point = (struct ebt_entry *)(private->hook_entry[hook]->data); |
| 188 | counter_base = cb_base + private->hook_entry[hook]->counter_offset; |
| 189 | /* base for chain jumps */ |
| 190 | base = private->entries; |
| 191 | i = 0; |
| 192 | while (i < nentries) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 193 | if (ebt_basic_match(point, eth_hdr(skb), in, out)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | goto letscontinue; |
| 195 | |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 196 | if (EBT_MATCH_ITERATE(point, ebt_do_match, skb, &mtpar) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | goto letscontinue; |
Jan Engelhardt | 5365f80 | 2008-10-08 11:35:16 +0200 | [diff] [blame] | 198 | if (hotdrop) { |
| 199 | read_unlock_bh(&table->lock); |
| 200 | return NF_DROP; |
| 201 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
| 203 | /* increase counter */ |
| 204 | (*(counter_base + i)).pcnt++; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 205 | (*(counter_base + i)).bcnt += skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
| 207 | /* these should only watch: not modify, nor tell us |
| 208 | what to do with the packet */ |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 209 | EBT_WATCHER_ITERATE(point, ebt_do_watcher, skb, &tgpar); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
| 211 | t = (struct ebt_entry_target *) |
| 212 | (((char *)point) + point->target_offset); |
| 213 | /* standard target */ |
| 214 | if (!t->u.target->target) |
| 215 | verdict = ((struct ebt_standard_target *)t)->verdict; |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 216 | else { |
| 217 | tgpar.target = t->u.target; |
| 218 | tgpar.targinfo = t->data; |
| 219 | verdict = t->u.target->target(skb, &tgpar); |
| 220 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | if (verdict == EBT_ACCEPT) { |
| 222 | read_unlock_bh(&table->lock); |
| 223 | return NF_ACCEPT; |
| 224 | } |
| 225 | if (verdict == EBT_DROP) { |
| 226 | read_unlock_bh(&table->lock); |
| 227 | return NF_DROP; |
| 228 | } |
| 229 | if (verdict == EBT_RETURN) { |
| 230 | letsreturn: |
| 231 | #ifdef CONFIG_NETFILTER_DEBUG |
| 232 | if (sp == 0) { |
| 233 | BUGPRINT("RETURN on base chain"); |
| 234 | /* act like this is EBT_CONTINUE */ |
| 235 | goto letscontinue; |
| 236 | } |
| 237 | #endif |
| 238 | sp--; |
| 239 | /* put all the local variables right */ |
| 240 | i = cs[sp].n; |
| 241 | chaininfo = cs[sp].chaininfo; |
| 242 | nentries = chaininfo->nentries; |
| 243 | point = cs[sp].e; |
| 244 | counter_base = cb_base + |
| 245 | chaininfo->counter_offset; |
| 246 | continue; |
| 247 | } |
| 248 | if (verdict == EBT_CONTINUE) |
| 249 | goto letscontinue; |
| 250 | #ifdef CONFIG_NETFILTER_DEBUG |
| 251 | if (verdict < 0) { |
| 252 | BUGPRINT("bogus standard verdict\n"); |
| 253 | read_unlock_bh(&table->lock); |
| 254 | return NF_DROP; |
| 255 | } |
| 256 | #endif |
| 257 | /* jump to a udc */ |
| 258 | cs[sp].n = i + 1; |
| 259 | cs[sp].chaininfo = chaininfo; |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 260 | cs[sp].e = ebt_next_entry(point); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | i = 0; |
| 262 | chaininfo = (struct ebt_entries *) (base + verdict); |
| 263 | #ifdef CONFIG_NETFILTER_DEBUG |
| 264 | if (chaininfo->distinguisher) { |
| 265 | BUGPRINT("jump to non-chain\n"); |
| 266 | read_unlock_bh(&table->lock); |
| 267 | return NF_DROP; |
| 268 | } |
| 269 | #endif |
| 270 | nentries = chaininfo->nentries; |
| 271 | point = (struct ebt_entry *)chaininfo->data; |
| 272 | counter_base = cb_base + chaininfo->counter_offset; |
| 273 | sp++; |
| 274 | continue; |
| 275 | letscontinue: |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 276 | point = ebt_next_entry(point); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | i++; |
| 278 | } |
| 279 | |
| 280 | /* I actually like this :) */ |
| 281 | if (chaininfo->policy == EBT_RETURN) |
| 282 | goto letsreturn; |
| 283 | if (chaininfo->policy == EBT_ACCEPT) { |
| 284 | read_unlock_bh(&table->lock); |
| 285 | return NF_ACCEPT; |
| 286 | } |
| 287 | read_unlock_bh(&table->lock); |
| 288 | return NF_DROP; |
| 289 | } |
| 290 | |
| 291 | /* If it succeeds, returns element and locks mutex */ |
| 292 | static inline void * |
| 293 | find_inlist_lock_noload(struct list_head *head, const char *name, int *error, |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 294 | struct mutex *mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 296 | struct { |
| 297 | struct list_head list; |
| 298 | char name[EBT_FUNCTION_MAXNAMELEN]; |
| 299 | } *e; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 301 | *error = mutex_lock_interruptible(mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | if (*error != 0) |
| 303 | return NULL; |
| 304 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 305 | list_for_each_entry(e, head, list) { |
| 306 | if (strcmp(e->name, name) == 0) |
| 307 | return e; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | } |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 309 | *error = -ENOENT; |
| 310 | mutex_unlock(mutex); |
| 311 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | } |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | static void * |
| 315 | find_inlist_lock(struct list_head *head, const char *name, const char *prefix, |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 316 | int *error, struct mutex *mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | { |
Johannes Berg | 95a5afc | 2008-10-16 15:24:51 -0700 | [diff] [blame] | 318 | return try_then_request_module( |
| 319 | find_inlist_lock_noload(head, name, error, mutex), |
| 320 | "%s%s", prefix, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
| 323 | static inline struct ebt_table * |
Alexey Dobriyan | 511061e | 2008-11-04 14:22:55 +0100 | [diff] [blame] | 324 | find_table_lock(struct net *net, const char *name, int *error, |
| 325 | struct mutex *mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | { |
Alexey Dobriyan | 511061e | 2008-11-04 14:22:55 +0100 | [diff] [blame] | 327 | return find_inlist_lock(&net->xt.tables[NFPROTO_BRIDGE], name, |
| 328 | "ebtable_", error, mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | } |
| 330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | static inline int |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 332 | ebt_check_match(struct ebt_entry_match *m, struct xt_mtchk_param *par, |
| 333 | unsigned int *cnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 335 | const struct ebt_entry *e = par->entryinfo; |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 336 | struct xt_match *match; |
Al Viro | 14197d5 | 2006-11-30 19:25:21 -0800 | [diff] [blame] | 337 | size_t left = ((char *)e + e->watchers_offset) - (char *)m; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | int ret; |
| 339 | |
Al Viro | 14197d5 | 2006-11-30 19:25:21 -0800 | [diff] [blame] | 340 | if (left < sizeof(struct ebt_entry_match) || |
| 341 | left - sizeof(struct ebt_entry_match) < m->match_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | return -EINVAL; |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 343 | |
| 344 | match = try_then_request_module(xt_find_match(NFPROTO_BRIDGE, |
| 345 | m->u.name, 0), "ebt_%s", m->u.name); |
| 346 | if (IS_ERR(match)) |
| 347 | return PTR_ERR(match); |
| 348 | if (match == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | return -ENOENT; |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 350 | m->u.match = match; |
| 351 | |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 352 | par->match = match; |
| 353 | par->matchinfo = m->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 354 | ret = xt_check_match(par, m->match_size, |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 355 | e->ethproto, e->invflags & EBT_IPROTO); |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 356 | if (ret < 0) { |
| 357 | module_put(match->me); |
| 358 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | } |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 360 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | (*cnt)++; |
| 362 | return 0; |
| 363 | } |
| 364 | |
| 365 | static inline int |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 366 | ebt_check_watcher(struct ebt_entry_watcher *w, struct xt_tgchk_param *par, |
| 367 | unsigned int *cnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | { |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 369 | const struct ebt_entry *e = par->entryinfo; |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 370 | struct xt_target *watcher; |
Al Viro | 14197d5 | 2006-11-30 19:25:21 -0800 | [diff] [blame] | 371 | size_t left = ((char *)e + e->target_offset) - (char *)w; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | int ret; |
| 373 | |
Al Viro | 14197d5 | 2006-11-30 19:25:21 -0800 | [diff] [blame] | 374 | if (left < sizeof(struct ebt_entry_watcher) || |
| 375 | left - sizeof(struct ebt_entry_watcher) < w->watcher_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | return -EINVAL; |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 377 | |
| 378 | watcher = try_then_request_module( |
| 379 | xt_find_target(NFPROTO_BRIDGE, w->u.name, 0), |
| 380 | "ebt_%s", w->u.name); |
| 381 | if (IS_ERR(watcher)) |
| 382 | return PTR_ERR(watcher); |
| 383 | if (watcher == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | return -ENOENT; |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 385 | w->u.watcher = watcher; |
| 386 | |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 387 | par->target = watcher; |
| 388 | par->targinfo = w->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 389 | ret = xt_check_target(par, w->watcher_size, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 390 | e->ethproto, e->invflags & EBT_IPROTO); |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 391 | if (ret < 0) { |
| 392 | module_put(watcher->me); |
| 393 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | (*cnt)++; |
| 397 | return 0; |
| 398 | } |
| 399 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 400 | static int ebt_verify_pointers(const struct ebt_replace *repl, |
Al Viro | 70fe9af | 2006-11-30 19:26:14 -0800 | [diff] [blame] | 401 | struct ebt_table_info *newinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | { |
Al Viro | 70fe9af | 2006-11-30 19:26:14 -0800 | [diff] [blame] | 403 | unsigned int limit = repl->entries_size; |
| 404 | unsigned int valid_hooks = repl->valid_hooks; |
| 405 | unsigned int offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | int i; |
| 407 | |
Al Viro | e4fd77d | 2006-11-30 19:26:35 -0800 | [diff] [blame] | 408 | for (i = 0; i < NF_BR_NUMHOOKS; i++) |
| 409 | newinfo->hook_entry[i] = NULL; |
| 410 | |
| 411 | newinfo->entries_size = repl->entries_size; |
| 412 | newinfo->nentries = repl->nentries; |
| 413 | |
Al Viro | 70fe9af | 2006-11-30 19:26:14 -0800 | [diff] [blame] | 414 | while (offset < limit) { |
| 415 | size_t left = limit - offset; |
| 416 | struct ebt_entry *e = (void *)newinfo->entries + offset; |
Al Viro | bb2ef25 | 2006-11-30 19:22:42 -0800 | [diff] [blame] | 417 | |
Al Viro | 70fe9af | 2006-11-30 19:26:14 -0800 | [diff] [blame] | 418 | if (left < sizeof(unsigned int)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | break; |
Al Viro | 22b440b | 2006-11-30 19:25:51 -0800 | [diff] [blame] | 420 | |
Al Viro | 70fe9af | 2006-11-30 19:26:14 -0800 | [diff] [blame] | 421 | for (i = 0; i < NF_BR_NUMHOOKS; i++) { |
| 422 | if ((valid_hooks & (1 << i)) == 0) |
| 423 | continue; |
Al Viro | 1e419cd | 2006-11-30 19:28:48 -0800 | [diff] [blame] | 424 | if ((char __user *)repl->hook_entry[i] == |
| 425 | repl->entries + offset) |
Al Viro | 70fe9af | 2006-11-30 19:26:14 -0800 | [diff] [blame] | 426 | break; |
| 427 | } |
| 428 | |
| 429 | if (i != NF_BR_NUMHOOKS || !(e->bitmask & EBT_ENTRY_OR_ENTRIES)) { |
| 430 | if (e->bitmask != 0) { |
| 431 | /* we make userspace set this right, |
| 432 | so there is no misunderstanding */ |
| 433 | BUGPRINT("EBT_ENTRY_OR_ENTRIES shouldn't be set " |
| 434 | "in distinguisher\n"); |
| 435 | return -EINVAL; |
| 436 | } |
| 437 | if (i != NF_BR_NUMHOOKS) |
| 438 | newinfo->hook_entry[i] = (struct ebt_entries *)e; |
| 439 | if (left < sizeof(struct ebt_entries)) |
| 440 | break; |
| 441 | offset += sizeof(struct ebt_entries); |
| 442 | } else { |
| 443 | if (left < sizeof(struct ebt_entry)) |
| 444 | break; |
| 445 | if (left < e->next_offset) |
| 446 | break; |
Florian Westphal | 1756de2 | 2010-02-15 18:15:55 +0100 | [diff] [blame] | 447 | if (e->next_offset < sizeof(struct ebt_entry)) |
| 448 | return -EINVAL; |
Al Viro | 70fe9af | 2006-11-30 19:26:14 -0800 | [diff] [blame] | 449 | offset += e->next_offset; |
| 450 | } |
| 451 | } |
| 452 | if (offset != limit) { |
| 453 | BUGPRINT("entries_size too small\n"); |
| 454 | return -EINVAL; |
| 455 | } |
Al Viro | e4fd77d | 2006-11-30 19:26:35 -0800 | [diff] [blame] | 456 | |
| 457 | /* check if all valid hooks have a chain */ |
| 458 | for (i = 0; i < NF_BR_NUMHOOKS; i++) { |
| 459 | if (!newinfo->hook_entry[i] && |
| 460 | (valid_hooks & (1 << i))) { |
| 461 | BUGPRINT("Valid hook without chain\n"); |
| 462 | return -EINVAL; |
| 463 | } |
| 464 | } |
Al Viro | 70fe9af | 2006-11-30 19:26:14 -0800 | [diff] [blame] | 465 | return 0; |
Al Viro | 22b440b | 2006-11-30 19:25:51 -0800 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | /* |
| 469 | * this one is very careful, as it is the first function |
| 470 | * to parse the userspace data |
| 471 | */ |
| 472 | static inline int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 473 | ebt_check_entry_size_and_hooks(const struct ebt_entry *e, |
| 474 | const struct ebt_table_info *newinfo, |
Al Viro | 0e79553 | 2006-11-30 19:27:13 -0800 | [diff] [blame] | 475 | unsigned int *n, unsigned int *cnt, |
| 476 | unsigned int *totalcnt, unsigned int *udc_cnt) |
Al Viro | 22b440b | 2006-11-30 19:25:51 -0800 | [diff] [blame] | 477 | { |
Al Viro | 22b440b | 2006-11-30 19:25:51 -0800 | [diff] [blame] | 478 | int i; |
| 479 | |
| 480 | for (i = 0; i < NF_BR_NUMHOOKS; i++) { |
Al Viro | 0e79553 | 2006-11-30 19:27:13 -0800 | [diff] [blame] | 481 | if ((void *)e == (void *)newinfo->hook_entry[i]) |
Al Viro | 22b440b | 2006-11-30 19:25:51 -0800 | [diff] [blame] | 482 | break; |
| 483 | } |
| 484 | /* beginning of a new chain |
| 485 | if i == NF_BR_NUMHOOKS it must be a user defined chain */ |
| 486 | if (i != NF_BR_NUMHOOKS || !e->bitmask) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | /* this checks if the previous chain has as many entries |
| 488 | as it said it has */ |
| 489 | if (*n != *cnt) { |
| 490 | BUGPRINT("nentries does not equal the nr of entries " |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 491 | "in the chain\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | return -EINVAL; |
| 493 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | if (((struct ebt_entries *)e)->policy != EBT_DROP && |
| 495 | ((struct ebt_entries *)e)->policy != EBT_ACCEPT) { |
| 496 | /* only RETURN from udc */ |
| 497 | if (i != NF_BR_NUMHOOKS || |
| 498 | ((struct ebt_entries *)e)->policy != EBT_RETURN) { |
| 499 | BUGPRINT("bad policy\n"); |
| 500 | return -EINVAL; |
| 501 | } |
| 502 | } |
| 503 | if (i == NF_BR_NUMHOOKS) /* it's a user defined chain */ |
| 504 | (*udc_cnt)++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | if (((struct ebt_entries *)e)->counter_offset != *totalcnt) { |
| 506 | BUGPRINT("counter_offset != totalcnt"); |
| 507 | return -EINVAL; |
| 508 | } |
| 509 | *n = ((struct ebt_entries *)e)->nentries; |
| 510 | *cnt = 0; |
| 511 | return 0; |
| 512 | } |
| 513 | /* a plain old entry, heh */ |
| 514 | if (sizeof(struct ebt_entry) > e->watchers_offset || |
| 515 | e->watchers_offset > e->target_offset || |
| 516 | e->target_offset >= e->next_offset) { |
| 517 | BUGPRINT("entry offsets not in right order\n"); |
| 518 | return -EINVAL; |
| 519 | } |
| 520 | /* this is not checked anywhere else */ |
| 521 | if (e->next_offset - e->target_offset < sizeof(struct ebt_entry_target)) { |
| 522 | BUGPRINT("target size too small\n"); |
| 523 | return -EINVAL; |
| 524 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | (*cnt)++; |
| 526 | (*totalcnt)++; |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | struct ebt_cl_stack |
| 531 | { |
| 532 | struct ebt_chainstack cs; |
| 533 | int from; |
| 534 | unsigned int hookmask; |
| 535 | }; |
| 536 | |
| 537 | /* |
| 538 | * we need these positions to check that the jumps to a different part of the |
| 539 | * entries is a jump to the beginning of a new chain. |
| 540 | */ |
| 541 | static inline int |
| 542 | ebt_get_udc_positions(struct ebt_entry *e, struct ebt_table_info *newinfo, |
Al Viro | 177abc3 | 2006-11-30 19:27:32 -0800 | [diff] [blame] | 543 | unsigned int *n, struct ebt_cl_stack *udc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | { |
| 545 | int i; |
| 546 | |
| 547 | /* we're only interested in chain starts */ |
Al Viro | 40642f9 | 2006-11-30 19:24:12 -0800 | [diff] [blame] | 548 | if (e->bitmask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | return 0; |
| 550 | for (i = 0; i < NF_BR_NUMHOOKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | if (newinfo->hook_entry[i] == (struct ebt_entries *)e) |
| 552 | break; |
| 553 | } |
| 554 | /* only care about udc */ |
| 555 | if (i != NF_BR_NUMHOOKS) |
| 556 | return 0; |
| 557 | |
| 558 | udc[*n].cs.chaininfo = (struct ebt_entries *)e; |
| 559 | /* these initialisations are depended on later in check_chainloops() */ |
| 560 | udc[*n].cs.n = 0; |
| 561 | udc[*n].hookmask = 0; |
| 562 | |
| 563 | (*n)++; |
| 564 | return 0; |
| 565 | } |
| 566 | |
| 567 | static inline int |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 568 | ebt_cleanup_match(struct ebt_entry_match *m, struct net *net, unsigned int *i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | { |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 570 | struct xt_mtdtor_param par; |
| 571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | if (i && (*i)-- == 0) |
| 573 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 575 | par.net = net; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 576 | par.match = m->u.match; |
| 577 | par.matchinfo = m->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 578 | par.family = NFPROTO_BRIDGE; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 579 | if (par.match->destroy != NULL) |
| 580 | par.match->destroy(&par); |
| 581 | module_put(par.match->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | return 0; |
| 583 | } |
| 584 | |
| 585 | static inline int |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 586 | ebt_cleanup_watcher(struct ebt_entry_watcher *w, struct net *net, unsigned int *i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | { |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 588 | struct xt_tgdtor_param par; |
| 589 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | if (i && (*i)-- == 0) |
| 591 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 593 | par.net = net; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 594 | par.target = w->u.watcher; |
| 595 | par.targinfo = w->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 596 | par.family = NFPROTO_BRIDGE; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 597 | if (par.target->destroy != NULL) |
| 598 | par.target->destroy(&par); |
| 599 | module_put(par.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | return 0; |
| 601 | } |
| 602 | |
| 603 | static inline int |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 604 | ebt_cleanup_entry(struct ebt_entry *e, struct net *net, unsigned int *cnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | { |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 606 | struct xt_tgdtor_param par; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | struct ebt_entry_target *t; |
| 608 | |
Al Viro | 40642f9 | 2006-11-30 19:24:12 -0800 | [diff] [blame] | 609 | if (e->bitmask == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | return 0; |
| 611 | /* we're done */ |
| 612 | if (cnt && (*cnt)-- == 0) |
| 613 | return 1; |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 614 | EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, net, NULL); |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 615 | EBT_MATCH_ITERATE(e, ebt_cleanup_match, net, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | t = (struct ebt_entry_target *)(((char *)e) + e->target_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 618 | par.net = net; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 619 | par.target = t->u.target; |
| 620 | par.targinfo = t->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 621 | par.family = NFPROTO_BRIDGE; |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 622 | if (par.target->destroy != NULL) |
| 623 | par.target->destroy(&par); |
| 624 | module_put(par.target->me); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | return 0; |
| 626 | } |
| 627 | |
| 628 | static inline int |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 629 | ebt_check_entry(struct ebt_entry *e, struct net *net, |
| 630 | const struct ebt_table_info *newinfo, |
Al Viro | f7da79d | 2006-11-30 19:27:48 -0800 | [diff] [blame] | 631 | const char *name, unsigned int *cnt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | struct ebt_cl_stack *cl_s, unsigned int udc_cnt) |
| 633 | { |
| 634 | struct ebt_entry_target *t; |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 635 | struct xt_target *target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | unsigned int i, j, hook = 0, hookmask = 0; |
Chuck Ebbert | 44f9a2f | 2007-01-04 12:17:44 -0800 | [diff] [blame] | 637 | size_t gap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | int ret; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 639 | struct xt_mtchk_param mtpar; |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 640 | struct xt_tgchk_param tgpar; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | |
| 642 | /* don't mess with the struct ebt_entries */ |
Al Viro | 40642f9 | 2006-11-30 19:24:12 -0800 | [diff] [blame] | 643 | if (e->bitmask == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | return 0; |
| 645 | |
| 646 | if (e->bitmask & ~EBT_F_MASK) { |
| 647 | BUGPRINT("Unknown flag for bitmask\n"); |
| 648 | return -EINVAL; |
| 649 | } |
| 650 | if (e->invflags & ~EBT_INV_MASK) { |
| 651 | BUGPRINT("Unknown flag for inv bitmask\n"); |
| 652 | return -EINVAL; |
| 653 | } |
| 654 | if ( (e->bitmask & EBT_NOPROTO) && (e->bitmask & EBT_802_3) ) { |
| 655 | BUGPRINT("NOPROTO & 802_3 not allowed\n"); |
| 656 | return -EINVAL; |
| 657 | } |
| 658 | /* what hook do we belong to? */ |
| 659 | for (i = 0; i < NF_BR_NUMHOOKS; i++) { |
Al Viro | f7da79d | 2006-11-30 19:27:48 -0800 | [diff] [blame] | 660 | if (!newinfo->hook_entry[i]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | continue; |
| 662 | if ((char *)newinfo->hook_entry[i] < (char *)e) |
| 663 | hook = i; |
| 664 | else |
| 665 | break; |
| 666 | } |
| 667 | /* (1 << NF_BR_NUMHOOKS) tells the check functions the rule is on |
| 668 | a base chain */ |
| 669 | if (i < NF_BR_NUMHOOKS) |
| 670 | hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS); |
| 671 | else { |
| 672 | for (i = 0; i < udc_cnt; i++) |
| 673 | if ((char *)(cl_s[i].cs.chaininfo) > (char *)e) |
| 674 | break; |
| 675 | if (i == 0) |
| 676 | hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS); |
| 677 | else |
| 678 | hookmask = cl_s[i - 1].hookmask; |
| 679 | } |
| 680 | i = 0; |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 681 | |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 682 | mtpar.net = tgpar.net = net; |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 683 | mtpar.table = tgpar.table = name; |
| 684 | mtpar.entryinfo = tgpar.entryinfo = e; |
| 685 | mtpar.hook_mask = tgpar.hook_mask = hookmask; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 686 | mtpar.family = tgpar.family = NFPROTO_BRIDGE; |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 687 | ret = EBT_MATCH_ITERATE(e, ebt_check_match, &mtpar, &i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | if (ret != 0) |
| 689 | goto cleanup_matches; |
| 690 | j = 0; |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 691 | ret = EBT_WATCHER_ITERATE(e, ebt_check_watcher, &tgpar, &j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | if (ret != 0) |
| 693 | goto cleanup_watchers; |
| 694 | t = (struct ebt_entry_target *)(((char *)e) + e->target_offset); |
Chuck Ebbert | 44f9a2f | 2007-01-04 12:17:44 -0800 | [diff] [blame] | 695 | gap = e->next_offset - e->target_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 697 | target = try_then_request_module( |
| 698 | xt_find_target(NFPROTO_BRIDGE, t->u.name, 0), |
| 699 | "ebt_%s", t->u.name); |
| 700 | if (IS_ERR(target)) { |
| 701 | ret = PTR_ERR(target); |
Jan Engelhardt | 001a18d | 2008-10-08 11:35:14 +0200 | [diff] [blame] | 702 | goto cleanup_watchers; |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 703 | } else if (target == NULL) { |
| 704 | ret = -ENOENT; |
Jan Engelhardt | 001a18d | 2008-10-08 11:35:14 +0200 | [diff] [blame] | 705 | goto cleanup_watchers; |
| 706 | } |
| 707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | t->u.target = target; |
| 709 | if (t->u.target == &ebt_standard_target) { |
Al Viro | 14197d5 | 2006-11-30 19:25:21 -0800 | [diff] [blame] | 710 | if (gap < sizeof(struct ebt_standard_target)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | BUGPRINT("Standard target size too big\n"); |
| 712 | ret = -EFAULT; |
| 713 | goto cleanup_watchers; |
| 714 | } |
| 715 | if (((struct ebt_standard_target *)t)->verdict < |
| 716 | -NUM_STANDARD_TARGETS) { |
| 717 | BUGPRINT("Invalid standard target\n"); |
| 718 | ret = -EFAULT; |
| 719 | goto cleanup_watchers; |
| 720 | } |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 721 | } else if (t->target_size > gap - sizeof(struct ebt_entry_target)) { |
| 722 | module_put(t->u.target->me); |
| 723 | ret = -EFAULT; |
| 724 | goto cleanup_watchers; |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 725 | } |
| 726 | |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 727 | tgpar.target = target; |
| 728 | tgpar.targinfo = t->data; |
Jan Engelhardt | 916a917 | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 729 | ret = xt_check_target(&tgpar, t->target_size, |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 730 | e->ethproto, e->invflags & EBT_IPROTO); |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 731 | if (ret < 0) { |
| 732 | module_put(target->me); |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 733 | goto cleanup_watchers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | } |
| 735 | (*cnt)++; |
| 736 | return 0; |
| 737 | cleanup_watchers: |
Patrick McHardy | add6746 | 2010-02-03 13:45:12 +0100 | [diff] [blame] | 738 | EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, net, &j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | cleanup_matches: |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 740 | EBT_MATCH_ITERATE(e, ebt_cleanup_match, net, &i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | return ret; |
| 742 | } |
| 743 | |
| 744 | /* |
| 745 | * checks for loops and sets the hook mask for udc |
| 746 | * the hook mask for udc tells us from which base chains the udc can be |
| 747 | * accessed. This mask is a parameter to the check() functions of the extensions |
| 748 | */ |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 749 | static int check_chainloops(const struct ebt_entries *chain, struct ebt_cl_stack *cl_s, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | unsigned int udc_cnt, unsigned int hooknr, char *base) |
| 751 | { |
| 752 | int i, chain_nr = -1, pos = 0, nentries = chain->nentries, verdict; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 753 | const struct ebt_entry *e = (struct ebt_entry *)chain->data; |
| 754 | const struct ebt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
| 756 | while (pos < nentries || chain_nr != -1) { |
| 757 | /* end of udc, go back one 'recursion' step */ |
| 758 | if (pos == nentries) { |
| 759 | /* put back values of the time when this chain was called */ |
| 760 | e = cl_s[chain_nr].cs.e; |
| 761 | if (cl_s[chain_nr].from != -1) |
| 762 | nentries = |
| 763 | cl_s[cl_s[chain_nr].from].cs.chaininfo->nentries; |
| 764 | else |
| 765 | nentries = chain->nentries; |
| 766 | pos = cl_s[chain_nr].cs.n; |
| 767 | /* make sure we won't see a loop that isn't one */ |
| 768 | cl_s[chain_nr].cs.n = 0; |
| 769 | chain_nr = cl_s[chain_nr].from; |
| 770 | if (pos == nentries) |
| 771 | continue; |
| 772 | } |
| 773 | t = (struct ebt_entry_target *) |
| 774 | (((char *)e) + e->target_offset); |
| 775 | if (strcmp(t->u.name, EBT_STANDARD_TARGET)) |
| 776 | goto letscontinue; |
| 777 | if (e->target_offset + sizeof(struct ebt_standard_target) > |
| 778 | e->next_offset) { |
| 779 | BUGPRINT("Standard target size too big\n"); |
| 780 | return -1; |
| 781 | } |
| 782 | verdict = ((struct ebt_standard_target *)t)->verdict; |
| 783 | if (verdict >= 0) { /* jump to another chain */ |
| 784 | struct ebt_entries *hlp2 = |
| 785 | (struct ebt_entries *)(base + verdict); |
| 786 | for (i = 0; i < udc_cnt; i++) |
| 787 | if (hlp2 == cl_s[i].cs.chaininfo) |
| 788 | break; |
| 789 | /* bad destination or loop */ |
| 790 | if (i == udc_cnt) { |
| 791 | BUGPRINT("bad destination\n"); |
| 792 | return -1; |
| 793 | } |
| 794 | if (cl_s[i].cs.n) { |
| 795 | BUGPRINT("loop\n"); |
| 796 | return -1; |
| 797 | } |
Al Viro | 98a0824 | 2006-11-30 19:24:49 -0800 | [diff] [blame] | 798 | if (cl_s[i].hookmask & (1 << hooknr)) |
| 799 | goto letscontinue; |
| 800 | /* this can't be 0, so the loop test is correct */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | cl_s[i].cs.n = pos + 1; |
| 802 | pos = 0; |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 803 | cl_s[i].cs.e = ebt_next_entry(e); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | e = (struct ebt_entry *)(hlp2->data); |
| 805 | nentries = hlp2->nentries; |
| 806 | cl_s[i].from = chain_nr; |
| 807 | chain_nr = i; |
| 808 | /* this udc is accessible from the base chain for hooknr */ |
| 809 | cl_s[i].hookmask |= (1 << hooknr); |
| 810 | continue; |
| 811 | } |
| 812 | letscontinue: |
Jan Engelhardt | 98e8640 | 2009-04-15 21:06:05 +0200 | [diff] [blame] | 813 | e = ebt_next_entry(e); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | pos++; |
| 815 | } |
| 816 | return 0; |
| 817 | } |
| 818 | |
| 819 | /* do the parsing of the table/chains/entries/matches/watchers/targets, heh */ |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 820 | static int translate_table(struct net *net, const char *name, |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 821 | struct ebt_table_info *newinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | { |
| 823 | unsigned int i, j, k, udc_cnt; |
| 824 | int ret; |
| 825 | struct ebt_cl_stack *cl_s = NULL; /* used in the checking for chain loops */ |
| 826 | |
| 827 | i = 0; |
Al Viro | 1f072c9 | 2006-11-30 19:26:53 -0800 | [diff] [blame] | 828 | while (i < NF_BR_NUMHOOKS && !newinfo->hook_entry[i]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | i++; |
| 830 | if (i == NF_BR_NUMHOOKS) { |
| 831 | BUGPRINT("No valid hooks specified\n"); |
| 832 | return -EINVAL; |
| 833 | } |
Al Viro | 1f072c9 | 2006-11-30 19:26:53 -0800 | [diff] [blame] | 834 | if (newinfo->hook_entry[i] != (struct ebt_entries *)newinfo->entries) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | BUGPRINT("Chains don't start at beginning\n"); |
| 836 | return -EINVAL; |
| 837 | } |
| 838 | /* make sure chains are ordered after each other in same order |
| 839 | as their corresponding hooks */ |
| 840 | for (j = i + 1; j < NF_BR_NUMHOOKS; j++) { |
Al Viro | 1f072c9 | 2006-11-30 19:26:53 -0800 | [diff] [blame] | 841 | if (!newinfo->hook_entry[j]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | continue; |
Al Viro | 1f072c9 | 2006-11-30 19:26:53 -0800 | [diff] [blame] | 843 | if (newinfo->hook_entry[j] <= newinfo->hook_entry[i]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | BUGPRINT("Hook order must be followed\n"); |
| 845 | return -EINVAL; |
| 846 | } |
| 847 | i = j; |
| 848 | } |
| 849 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | /* do some early checkings and initialize some things */ |
| 851 | i = 0; /* holds the expected nr. of entries for the chain */ |
| 852 | j = 0; /* holds the up to now counted entries for the chain */ |
| 853 | k = 0; /* holds the total nr. of entries, should equal |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 854 | newinfo->nentries afterwards */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | udc_cnt = 0; /* will hold the nr. of user defined chains (udc) */ |
| 856 | ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, |
Al Viro | 0e79553 | 2006-11-30 19:27:13 -0800 | [diff] [blame] | 857 | ebt_check_entry_size_and_hooks, newinfo, |
| 858 | &i, &j, &k, &udc_cnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | |
| 860 | if (ret != 0) |
| 861 | return ret; |
| 862 | |
| 863 | if (i != j) { |
| 864 | BUGPRINT("nentries does not equal the nr of entries in the " |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 865 | "(last) chain\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | return -EINVAL; |
| 867 | } |
| 868 | if (k != newinfo->nentries) { |
| 869 | BUGPRINT("Total nentries is wrong\n"); |
| 870 | return -EINVAL; |
| 871 | } |
| 872 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | /* get the location of the udc, put them in an array |
| 874 | while we're at it, allocate the chainstack */ |
| 875 | if (udc_cnt) { |
| 876 | /* this will get free'd in do_replace()/ebt_register_table() |
| 877 | if an error occurs */ |
Jayachandran C | 7ad4d2f | 2006-04-11 17:25:38 -0700 | [diff] [blame] | 878 | newinfo->chainstack = |
Christoph Lameter | 53b8a31 | 2007-02-20 13:57:51 -0800 | [diff] [blame] | 879 | vmalloc(nr_cpu_ids * sizeof(*(newinfo->chainstack))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | if (!newinfo->chainstack) |
| 881 | return -ENOMEM; |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 882 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | newinfo->chainstack[i] = |
Jayachandran C | 18bc89a | 2006-04-20 00:14:49 -0700 | [diff] [blame] | 884 | vmalloc(udc_cnt * sizeof(*(newinfo->chainstack[0]))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | if (!newinfo->chainstack[i]) { |
| 886 | while (i) |
| 887 | vfree(newinfo->chainstack[--i]); |
| 888 | vfree(newinfo->chainstack); |
| 889 | newinfo->chainstack = NULL; |
| 890 | return -ENOMEM; |
| 891 | } |
| 892 | } |
| 893 | |
Jayachandran C | 18bc89a | 2006-04-20 00:14:49 -0700 | [diff] [blame] | 894 | cl_s = vmalloc(udc_cnt * sizeof(*cl_s)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | if (!cl_s) |
| 896 | return -ENOMEM; |
| 897 | i = 0; /* the i'th udc */ |
| 898 | EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, |
Al Viro | 177abc3 | 2006-11-30 19:27:32 -0800 | [diff] [blame] | 899 | ebt_get_udc_positions, newinfo, &i, cl_s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | /* sanity check */ |
| 901 | if (i != udc_cnt) { |
| 902 | BUGPRINT("i != udc_cnt\n"); |
| 903 | vfree(cl_s); |
| 904 | return -EFAULT; |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | /* Check for loops */ |
| 909 | for (i = 0; i < NF_BR_NUMHOOKS; i++) |
Al Viro | 1f072c9 | 2006-11-30 19:26:53 -0800 | [diff] [blame] | 910 | if (newinfo->hook_entry[i]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | if (check_chainloops(newinfo->hook_entry[i], |
| 912 | cl_s, udc_cnt, i, newinfo->entries)) { |
James Lamanna | 68d3187 | 2005-06-22 22:12:57 -0700 | [diff] [blame] | 913 | vfree(cl_s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | return -EINVAL; |
| 915 | } |
| 916 | |
Jan Engelhardt | 96de0e2 | 2007-10-19 23:21:04 +0200 | [diff] [blame] | 917 | /* we now know the following (along with E=mc²): |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | - the nr of entries in each chain is right |
| 919 | - the size of the allocated space is right |
| 920 | - all valid hooks have a corresponding chain |
| 921 | - there are no loops |
| 922 | - wrong data can still be on the level of a single entry |
| 923 | - could be there are jumps to places that are not the |
| 924 | beginning of a chain. This can only occur in chains that |
| 925 | are not accessible from any base chains, so we don't care. */ |
| 926 | |
| 927 | /* used to know what we need to clean up if something goes wrong */ |
| 928 | i = 0; |
| 929 | ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 930 | ebt_check_entry, net, newinfo, name, &i, cl_s, udc_cnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | if (ret != 0) { |
| 932 | EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 933 | ebt_cleanup_entry, net, &i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | } |
James Lamanna | 68d3187 | 2005-06-22 22:12:57 -0700 | [diff] [blame] | 935 | vfree(cl_s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | return ret; |
| 937 | } |
| 938 | |
| 939 | /* called under write_lock */ |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 940 | static void get_counters(const struct ebt_counter *oldcounters, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | struct ebt_counter *counters, unsigned int nentries) |
| 942 | { |
| 943 | int i, cpu; |
| 944 | struct ebt_counter *counter_base; |
| 945 | |
| 946 | /* counters of cpu 0 */ |
| 947 | memcpy(counters, oldcounters, |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 948 | sizeof(struct ebt_counter) * nentries); |
| 949 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | /* add other counters to those of cpu 0 */ |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 951 | for_each_possible_cpu(cpu) { |
David S. Miller | c8923c6 | 2005-10-13 14:41:23 -0700 | [diff] [blame] | 952 | if (cpu == 0) |
| 953 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | counter_base = COUNTER_BASE(oldcounters, nentries, cpu); |
| 955 | for (i = 0; i < nentries; i++) { |
| 956 | counters[i].pcnt += counter_base[i].pcnt; |
| 957 | counters[i].bcnt += counter_base[i].bcnt; |
| 958 | } |
| 959 | } |
| 960 | } |
| 961 | |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 962 | static int do_replace_finish(struct net *net, struct ebt_replace *repl, |
| 963 | struct ebt_table_info *newinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | { |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 965 | int ret, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | struct ebt_counter *counterstmp = NULL; |
| 967 | /* used to be able to unlock earlier */ |
| 968 | struct ebt_table_info *table; |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 969 | struct ebt_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
| 971 | /* the user wants counters back |
| 972 | the check on the size is done later, when we have the lock */ |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 973 | if (repl->num_counters) { |
| 974 | unsigned long size = repl->num_counters * sizeof(*counterstmp); |
| 975 | counterstmp = vmalloc(size); |
| 976 | if (!counterstmp) |
| 977 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | newinfo->chainstack = NULL; |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 981 | ret = ebt_verify_pointers(repl, newinfo); |
Al Viro | 1bc2326 | 2006-11-30 19:28:08 -0800 | [diff] [blame] | 982 | if (ret != 0) |
| 983 | goto free_counterstmp; |
| 984 | |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 985 | ret = translate_table(net, repl->name, newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | |
| 987 | if (ret != 0) |
| 988 | goto free_counterstmp; |
| 989 | |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 990 | t = find_table_lock(net, repl->name, &ret, &ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | if (!t) { |
| 992 | ret = -ENOENT; |
| 993 | goto free_iterate; |
| 994 | } |
| 995 | |
| 996 | /* the table doesn't like it */ |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 997 | if (t->check && (ret = t->check(newinfo, repl->valid_hooks))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | goto free_unlock; |
| 999 | |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 1000 | if (repl->num_counters && repl->num_counters != t->private->nentries) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | BUGPRINT("Wrong nr. of counters requested\n"); |
| 1002 | ret = -EINVAL; |
| 1003 | goto free_unlock; |
| 1004 | } |
| 1005 | |
| 1006 | /* we have the mutex lock, so no danger in reading this pointer */ |
| 1007 | table = t->private; |
| 1008 | /* make sure the table can only be rmmod'ed if it contains no rules */ |
| 1009 | if (!table->nentries && newinfo->nentries && !try_module_get(t->me)) { |
| 1010 | ret = -ENOENT; |
| 1011 | goto free_unlock; |
| 1012 | } else if (table->nentries && !newinfo->nentries) |
| 1013 | module_put(t->me); |
| 1014 | /* we need an atomic snapshot of the counters */ |
| 1015 | write_lock_bh(&t->lock); |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 1016 | if (repl->num_counters) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | get_counters(t->private->counters, counterstmp, |
| 1018 | t->private->nentries); |
| 1019 | |
| 1020 | t->private = newinfo; |
| 1021 | write_unlock_bh(&t->lock); |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1022 | mutex_unlock(&ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | /* so, a user can change the chains while having messed up her counter |
| 1024 | allocation. Only reason why this is done is because this way the lock |
| 1025 | is held only once, while this doesn't bring the kernel into a |
| 1026 | dangerous state. */ |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 1027 | if (repl->num_counters && |
| 1028 | copy_to_user(repl->counters, counterstmp, |
| 1029 | repl->num_counters * sizeof(struct ebt_counter))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | ret = -EFAULT; |
| 1031 | } |
| 1032 | else |
| 1033 | ret = 0; |
| 1034 | |
| 1035 | /* decrease module count and free resources */ |
| 1036 | EBT_ENTRY_ITERATE(table->entries, table->entries_size, |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1037 | ebt_cleanup_entry, net, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
| 1039 | vfree(table->entries); |
| 1040 | if (table->chainstack) { |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 1041 | for_each_possible_cpu(i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | vfree(table->chainstack[i]); |
| 1043 | vfree(table->chainstack); |
| 1044 | } |
| 1045 | vfree(table); |
| 1046 | |
James Lamanna | 68d3187 | 2005-06-22 22:12:57 -0700 | [diff] [blame] | 1047 | vfree(counterstmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | return ret; |
| 1049 | |
| 1050 | free_unlock: |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1051 | mutex_unlock(&ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | free_iterate: |
| 1053 | EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1054 | ebt_cleanup_entry, net, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | free_counterstmp: |
James Lamanna | 68d3187 | 2005-06-22 22:12:57 -0700 | [diff] [blame] | 1056 | vfree(counterstmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | /* can be initialized in translate_table() */ |
| 1058 | if (newinfo->chainstack) { |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 1059 | for_each_possible_cpu(i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | vfree(newinfo->chainstack[i]); |
| 1061 | vfree(newinfo->chainstack); |
| 1062 | } |
Florian Westphal | e788759 | 2010-02-04 18:38:53 +0100 | [diff] [blame^] | 1063 | return ret; |
| 1064 | } |
| 1065 | |
| 1066 | /* replace the table */ |
| 1067 | static int do_replace(struct net *net, const void __user *user, |
| 1068 | unsigned int len) |
| 1069 | { |
| 1070 | int ret, countersize; |
| 1071 | struct ebt_table_info *newinfo; |
| 1072 | struct ebt_replace tmp; |
| 1073 | |
| 1074 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) |
| 1075 | return -EFAULT; |
| 1076 | |
| 1077 | if (len != sizeof(tmp) + tmp.entries_size) { |
| 1078 | BUGPRINT("Wrong len argument\n"); |
| 1079 | return -EINVAL; |
| 1080 | } |
| 1081 | |
| 1082 | if (tmp.entries_size == 0) { |
| 1083 | BUGPRINT("Entries_size never zero\n"); |
| 1084 | return -EINVAL; |
| 1085 | } |
| 1086 | /* overflow check */ |
| 1087 | if (tmp.nentries >= ((INT_MAX - sizeof(struct ebt_table_info)) / |
| 1088 | NR_CPUS - SMP_CACHE_BYTES) / sizeof(struct ebt_counter)) |
| 1089 | return -ENOMEM; |
| 1090 | if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter)) |
| 1091 | return -ENOMEM; |
| 1092 | |
| 1093 | countersize = COUNTER_OFFSET(tmp.nentries) * nr_cpu_ids; |
| 1094 | newinfo = vmalloc(sizeof(*newinfo) + countersize); |
| 1095 | if (!newinfo) |
| 1096 | return -ENOMEM; |
| 1097 | |
| 1098 | if (countersize) |
| 1099 | memset(newinfo->counters, 0, countersize); |
| 1100 | |
| 1101 | newinfo->entries = vmalloc(tmp.entries_size); |
| 1102 | if (!newinfo->entries) { |
| 1103 | ret = -ENOMEM; |
| 1104 | goto free_newinfo; |
| 1105 | } |
| 1106 | if (copy_from_user( |
| 1107 | newinfo->entries, tmp.entries, tmp.entries_size) != 0) { |
| 1108 | BUGPRINT("Couldn't copy entries from userspace\n"); |
| 1109 | ret = -EFAULT; |
| 1110 | goto free_entries; |
| 1111 | } |
| 1112 | |
| 1113 | ret = do_replace_finish(net, &tmp, newinfo); |
| 1114 | if (ret == 0) |
| 1115 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | free_entries: |
James Lamanna | 68d3187 | 2005-06-22 22:12:57 -0700 | [diff] [blame] | 1117 | vfree(newinfo->entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | free_newinfo: |
James Lamanna | 68d3187 | 2005-06-22 22:12:57 -0700 | [diff] [blame] | 1119 | vfree(newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | return ret; |
| 1121 | } |
| 1122 | |
Jan Engelhardt | 35aad0f | 2009-08-24 14:56:30 +0200 | [diff] [blame] | 1123 | struct ebt_table * |
| 1124 | ebt_register_table(struct net *net, const struct ebt_table *input_table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | { |
| 1126 | struct ebt_table_info *newinfo; |
Jan Engelhardt | 35aad0f | 2009-08-24 14:56:30 +0200 | [diff] [blame] | 1127 | struct ebt_table *t, *table; |
Al Viro | 1e419cd | 2006-11-30 19:28:48 -0800 | [diff] [blame] | 1128 | struct ebt_replace_kernel *repl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | int ret, i, countersize; |
Al Viro | df07a81 | 2006-11-30 19:28:25 -0800 | [diff] [blame] | 1130 | void *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | |
Jan Engelhardt | 35aad0f | 2009-08-24 14:56:30 +0200 | [diff] [blame] | 1132 | if (input_table == NULL || (repl = input_table->table) == NULL || |
| 1133 | repl->entries == 0 || repl->entries_size == 0 || |
| 1134 | repl->counters != NULL || input_table->private != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | BUGPRINT("Bad table data for ebt_register_table!!!\n"); |
Alexey Dobriyan | 6beceee | 2008-11-04 14:27:15 +0100 | [diff] [blame] | 1136 | return ERR_PTR(-EINVAL); |
| 1137 | } |
| 1138 | |
| 1139 | /* Don't add one table to multiple lists. */ |
Jan Engelhardt | 35aad0f | 2009-08-24 14:56:30 +0200 | [diff] [blame] | 1140 | table = kmemdup(input_table, sizeof(struct ebt_table), GFP_KERNEL); |
Alexey Dobriyan | 6beceee | 2008-11-04 14:27:15 +0100 | [diff] [blame] | 1141 | if (!table) { |
| 1142 | ret = -ENOMEM; |
| 1143 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | } |
| 1145 | |
Christoph Lameter | 53b8a31 | 2007-02-20 13:57:51 -0800 | [diff] [blame] | 1146 | countersize = COUNTER_OFFSET(repl->nentries) * nr_cpu_ids; |
Jayachandran C | 18bc89a | 2006-04-20 00:14:49 -0700 | [diff] [blame] | 1147 | newinfo = vmalloc(sizeof(*newinfo) + countersize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | ret = -ENOMEM; |
| 1149 | if (!newinfo) |
Alexey Dobriyan | 6beceee | 2008-11-04 14:27:15 +0100 | [diff] [blame] | 1150 | goto free_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | |
Al Viro | df07a81 | 2006-11-30 19:28:25 -0800 | [diff] [blame] | 1152 | p = vmalloc(repl->entries_size); |
| 1153 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | goto free_newinfo; |
| 1155 | |
Al Viro | df07a81 | 2006-11-30 19:28:25 -0800 | [diff] [blame] | 1156 | memcpy(p, repl->entries, repl->entries_size); |
| 1157 | newinfo->entries = p; |
| 1158 | |
| 1159 | newinfo->entries_size = repl->entries_size; |
| 1160 | newinfo->nentries = repl->nentries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | |
| 1162 | if (countersize) |
| 1163 | memset(newinfo->counters, 0, countersize); |
| 1164 | |
| 1165 | /* fill in newinfo and parse the entries */ |
| 1166 | newinfo->chainstack = NULL; |
Al Viro | df07a81 | 2006-11-30 19:28:25 -0800 | [diff] [blame] | 1167 | for (i = 0; i < NF_BR_NUMHOOKS; i++) { |
| 1168 | if ((repl->valid_hooks & (1 << i)) == 0) |
| 1169 | newinfo->hook_entry[i] = NULL; |
| 1170 | else |
| 1171 | newinfo->hook_entry[i] = p + |
| 1172 | ((char *)repl->hook_entry[i] - repl->entries); |
| 1173 | } |
Alexey Dobriyan | a83d8e8 | 2010-01-18 08:21:13 +0100 | [diff] [blame] | 1174 | ret = translate_table(net, repl->name, newinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | if (ret != 0) { |
| 1176 | BUGPRINT("Translate_table failed\n"); |
| 1177 | goto free_chainstack; |
| 1178 | } |
| 1179 | |
| 1180 | if (table->check && table->check(newinfo, table->valid_hooks)) { |
| 1181 | BUGPRINT("The table doesn't like its own initial data, lol\n"); |
Alexey Dobriyan | 6beceee | 2008-11-04 14:27:15 +0100 | [diff] [blame] | 1182 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | } |
| 1184 | |
| 1185 | table->private = newinfo; |
| 1186 | rwlock_init(&table->lock); |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1187 | ret = mutex_lock_interruptible(&ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | if (ret != 0) |
| 1189 | goto free_chainstack; |
| 1190 | |
Alexey Dobriyan | 511061e | 2008-11-04 14:22:55 +0100 | [diff] [blame] | 1191 | list_for_each_entry(t, &net->xt.tables[NFPROTO_BRIDGE], list) { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1192 | if (strcmp(t->name, table->name) == 0) { |
| 1193 | ret = -EEXIST; |
| 1194 | BUGPRINT("Table name already exists\n"); |
| 1195 | goto free_unlock; |
| 1196 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | } |
| 1198 | |
| 1199 | /* Hold a reference count if the chains aren't empty */ |
| 1200 | if (newinfo->nentries && !try_module_get(table->me)) { |
| 1201 | ret = -ENOENT; |
| 1202 | goto free_unlock; |
| 1203 | } |
Alexey Dobriyan | 511061e | 2008-11-04 14:22:55 +0100 | [diff] [blame] | 1204 | list_add(&table->list, &net->xt.tables[NFPROTO_BRIDGE]); |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1205 | mutex_unlock(&ebt_mutex); |
Alexey Dobriyan | 6beceee | 2008-11-04 14:27:15 +0100 | [diff] [blame] | 1206 | return table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | free_unlock: |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1208 | mutex_unlock(&ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | free_chainstack: |
| 1210 | if (newinfo->chainstack) { |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 1211 | for_each_possible_cpu(i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | vfree(newinfo->chainstack[i]); |
| 1213 | vfree(newinfo->chainstack); |
| 1214 | } |
| 1215 | vfree(newinfo->entries); |
| 1216 | free_newinfo: |
| 1217 | vfree(newinfo); |
Alexey Dobriyan | 6beceee | 2008-11-04 14:27:15 +0100 | [diff] [blame] | 1218 | free_table: |
| 1219 | kfree(table); |
| 1220 | out: |
| 1221 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | } |
| 1223 | |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1224 | void ebt_unregister_table(struct net *net, struct ebt_table *table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | { |
| 1226 | int i; |
| 1227 | |
| 1228 | if (!table) { |
| 1229 | BUGPRINT("Request to unregister NULL table!!!\n"); |
| 1230 | return; |
| 1231 | } |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1232 | mutex_lock(&ebt_mutex); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1233 | list_del(&table->list); |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1234 | mutex_unlock(&ebt_mutex); |
Alexey Dobriyan | dbcdf85 | 2008-11-04 14:28:04 +0100 | [diff] [blame] | 1235 | EBT_ENTRY_ITERATE(table->private->entries, table->private->entries_size, |
Alexey Dobriyan | f54e936 | 2010-01-18 08:25:47 +0100 | [diff] [blame] | 1236 | ebt_cleanup_entry, net, NULL); |
Alexey Dobriyan | dbcdf85 | 2008-11-04 14:28:04 +0100 | [diff] [blame] | 1237 | if (table->private->nentries) |
| 1238 | module_put(table->me); |
James Lamanna | 68d3187 | 2005-06-22 22:12:57 -0700 | [diff] [blame] | 1239 | vfree(table->private->entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | if (table->private->chainstack) { |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 1241 | for_each_possible_cpu(i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | vfree(table->private->chainstack[i]); |
| 1243 | vfree(table->private->chainstack); |
| 1244 | } |
| 1245 | vfree(table->private); |
Alexey Dobriyan | 6beceee | 2008-11-04 14:27:15 +0100 | [diff] [blame] | 1246 | kfree(table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | } |
| 1248 | |
| 1249 | /* userspace just supplied us with counters */ |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1250 | static int update_counters(struct net *net, const void __user *user, |
| 1251 | unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | { |
| 1253 | int i, ret; |
| 1254 | struct ebt_counter *tmp; |
| 1255 | struct ebt_replace hlp; |
| 1256 | struct ebt_table *t; |
| 1257 | |
| 1258 | if (copy_from_user(&hlp, user, sizeof(hlp))) |
| 1259 | return -EFAULT; |
| 1260 | |
| 1261 | if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter)) |
| 1262 | return -EINVAL; |
| 1263 | if (hlp.num_counters == 0) |
| 1264 | return -EINVAL; |
| 1265 | |
Jayachandran C | 18bc89a | 2006-04-20 00:14:49 -0700 | [diff] [blame] | 1266 | if (!(tmp = vmalloc(hlp.num_counters * sizeof(*tmp)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | MEMPRINT("Update_counters && nomemory\n"); |
| 1268 | return -ENOMEM; |
| 1269 | } |
| 1270 | |
Alexey Dobriyan | 511061e | 2008-11-04 14:22:55 +0100 | [diff] [blame] | 1271 | t = find_table_lock(net, hlp.name, &ret, &ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | if (!t) |
| 1273 | goto free_tmp; |
| 1274 | |
| 1275 | if (hlp.num_counters != t->private->nentries) { |
| 1276 | BUGPRINT("Wrong nr of counters\n"); |
| 1277 | ret = -EINVAL; |
| 1278 | goto unlock_mutex; |
| 1279 | } |
| 1280 | |
| 1281 | if ( copy_from_user(tmp, hlp.counters, |
| 1282 | hlp.num_counters * sizeof(struct ebt_counter)) ) { |
| 1283 | BUGPRINT("Updata_counters && !cfu\n"); |
| 1284 | ret = -EFAULT; |
| 1285 | goto unlock_mutex; |
| 1286 | } |
| 1287 | |
| 1288 | /* we want an atomic add of the counters */ |
| 1289 | write_lock_bh(&t->lock); |
| 1290 | |
| 1291 | /* we add to the counters of the first cpu */ |
| 1292 | for (i = 0; i < hlp.num_counters; i++) { |
| 1293 | t->private->counters[i].pcnt += tmp[i].pcnt; |
| 1294 | t->private->counters[i].bcnt += tmp[i].bcnt; |
| 1295 | } |
| 1296 | |
| 1297 | write_unlock_bh(&t->lock); |
| 1298 | ret = 0; |
| 1299 | unlock_mutex: |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1300 | mutex_unlock(&ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | free_tmp: |
| 1302 | vfree(tmp); |
| 1303 | return ret; |
| 1304 | } |
| 1305 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1306 | static inline int ebt_make_matchname(const struct ebt_entry_match *m, |
| 1307 | const char *base, char __user *ubase) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | { |
Al Viro | 1e419cd | 2006-11-30 19:28:48 -0800 | [diff] [blame] | 1309 | char __user *hlp = ubase + ((char *)m - base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | if (copy_to_user(hlp, m->u.match->name, EBT_FUNCTION_MAXNAMELEN)) |
| 1311 | return -EFAULT; |
| 1312 | return 0; |
| 1313 | } |
| 1314 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1315 | static inline int ebt_make_watchername(const struct ebt_entry_watcher *w, |
| 1316 | const char *base, char __user *ubase) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | { |
Al Viro | 1e419cd | 2006-11-30 19:28:48 -0800 | [diff] [blame] | 1318 | char __user *hlp = ubase + ((char *)w - base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | if (copy_to_user(hlp , w->u.watcher->name, EBT_FUNCTION_MAXNAMELEN)) |
| 1320 | return -EFAULT; |
| 1321 | return 0; |
| 1322 | } |
| 1323 | |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1324 | static inline int |
| 1325 | ebt_make_names(struct ebt_entry *e, const char *base, char __user *ubase) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | { |
| 1327 | int ret; |
Al Viro | 1e419cd | 2006-11-30 19:28:48 -0800 | [diff] [blame] | 1328 | char __user *hlp; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1329 | const struct ebt_entry_target *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | |
Al Viro | 40642f9 | 2006-11-30 19:24:12 -0800 | [diff] [blame] | 1331 | if (e->bitmask == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | return 0; |
| 1333 | |
Al Viro | 1e419cd | 2006-11-30 19:28:48 -0800 | [diff] [blame] | 1334 | hlp = ubase + (((char *)e + e->target_offset) - base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | t = (struct ebt_entry_target *)(((char *)e) + e->target_offset); |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 1336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | ret = EBT_MATCH_ITERATE(e, ebt_make_matchname, base, ubase); |
| 1338 | if (ret != 0) |
| 1339 | return ret; |
| 1340 | ret = EBT_WATCHER_ITERATE(e, ebt_make_watchername, base, ubase); |
| 1341 | if (ret != 0) |
| 1342 | return ret; |
| 1343 | if (copy_to_user(hlp, t->u.target->name, EBT_FUNCTION_MAXNAMELEN)) |
| 1344 | return -EFAULT; |
| 1345 | return 0; |
| 1346 | } |
| 1347 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1348 | /* called with ebt_mutex locked */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | static int copy_everything_to_user(struct ebt_table *t, void __user *user, |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1350 | const int *len, int cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | { |
| 1352 | struct ebt_replace tmp; |
Jan Engelhardt | d5d1baa | 2009-06-26 07:51:59 +0200 | [diff] [blame] | 1353 | struct ebt_counter *counterstmp; |
| 1354 | const struct ebt_counter *oldcounters; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | unsigned int entries_size, nentries; |
| 1356 | char *entries; |
| 1357 | |
| 1358 | if (cmd == EBT_SO_GET_ENTRIES) { |
| 1359 | entries_size = t->private->entries_size; |
| 1360 | nentries = t->private->nentries; |
| 1361 | entries = t->private->entries; |
| 1362 | oldcounters = t->private->counters; |
| 1363 | } else { |
| 1364 | entries_size = t->table->entries_size; |
| 1365 | nentries = t->table->nentries; |
| 1366 | entries = t->table->entries; |
| 1367 | oldcounters = t->table->counters; |
| 1368 | } |
| 1369 | |
| 1370 | if (copy_from_user(&tmp, user, sizeof(tmp))) { |
| 1371 | BUGPRINT("Cfu didn't work\n"); |
| 1372 | return -EFAULT; |
| 1373 | } |
| 1374 | |
| 1375 | if (*len != sizeof(struct ebt_replace) + entries_size + |
| 1376 | (tmp.num_counters? nentries * sizeof(struct ebt_counter): 0)) { |
| 1377 | BUGPRINT("Wrong size\n"); |
| 1378 | return -EINVAL; |
| 1379 | } |
| 1380 | |
| 1381 | if (tmp.nentries != nentries) { |
| 1382 | BUGPRINT("Nentries wrong\n"); |
| 1383 | return -EINVAL; |
| 1384 | } |
| 1385 | |
| 1386 | if (tmp.entries_size != entries_size) { |
| 1387 | BUGPRINT("Wrong size\n"); |
| 1388 | return -EINVAL; |
| 1389 | } |
| 1390 | |
| 1391 | /* userspace might not need the counters */ |
| 1392 | if (tmp.num_counters) { |
| 1393 | if (tmp.num_counters != nentries) { |
| 1394 | BUGPRINT("Num_counters wrong\n"); |
| 1395 | return -EINVAL; |
| 1396 | } |
Jayachandran C | 18bc89a | 2006-04-20 00:14:49 -0700 | [diff] [blame] | 1397 | counterstmp = vmalloc(nentries * sizeof(*counterstmp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | if (!counterstmp) { |
| 1399 | MEMPRINT("Couldn't copy counters, out of memory\n"); |
| 1400 | return -ENOMEM; |
| 1401 | } |
| 1402 | write_lock_bh(&t->lock); |
| 1403 | get_counters(oldcounters, counterstmp, nentries); |
| 1404 | write_unlock_bh(&t->lock); |
| 1405 | |
| 1406 | if (copy_to_user(tmp.counters, counterstmp, |
| 1407 | nentries * sizeof(struct ebt_counter))) { |
| 1408 | BUGPRINT("Couldn't copy counters to userspace\n"); |
| 1409 | vfree(counterstmp); |
| 1410 | return -EFAULT; |
| 1411 | } |
| 1412 | vfree(counterstmp); |
| 1413 | } |
| 1414 | |
| 1415 | if (copy_to_user(tmp.entries, entries, entries_size)) { |
| 1416 | BUGPRINT("Couldn't copy entries to userspace\n"); |
| 1417 | return -EFAULT; |
| 1418 | } |
| 1419 | /* set the match/watcher/target names right */ |
| 1420 | return EBT_ENTRY_ITERATE(entries, entries_size, |
| 1421 | ebt_make_names, entries, tmp.entries); |
| 1422 | } |
| 1423 | |
| 1424 | static int do_ebt_set_ctl(struct sock *sk, |
| 1425 | int cmd, void __user *user, unsigned int len) |
| 1426 | { |
| 1427 | int ret; |
| 1428 | |
Florian Westphal | dce766a | 2010-01-08 17:31:24 +0100 | [diff] [blame] | 1429 | if (!capable(CAP_NET_ADMIN)) |
| 1430 | return -EPERM; |
| 1431 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | switch(cmd) { |
| 1433 | case EBT_SO_SET_ENTRIES: |
Alexey Dobriyan | 511061e | 2008-11-04 14:22:55 +0100 | [diff] [blame] | 1434 | ret = do_replace(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | break; |
| 1436 | case EBT_SO_SET_COUNTERS: |
Alexey Dobriyan | 511061e | 2008-11-04 14:22:55 +0100 | [diff] [blame] | 1437 | ret = update_counters(sock_net(sk), user, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | break; |
| 1439 | default: |
| 1440 | ret = -EINVAL; |
| 1441 | } |
| 1442 | return ret; |
| 1443 | } |
| 1444 | |
| 1445 | static int do_ebt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 1446 | { |
| 1447 | int ret; |
| 1448 | struct ebt_replace tmp; |
| 1449 | struct ebt_table *t; |
| 1450 | |
Florian Westphal | dce766a | 2010-01-08 17:31:24 +0100 | [diff] [blame] | 1451 | if (!capable(CAP_NET_ADMIN)) |
| 1452 | return -EPERM; |
| 1453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | if (copy_from_user(&tmp, user, sizeof(tmp))) |
| 1455 | return -EFAULT; |
| 1456 | |
Alexey Dobriyan | 511061e | 2008-11-04 14:22:55 +0100 | [diff] [blame] | 1457 | t = find_table_lock(sock_net(sk), tmp.name, &ret, &ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | if (!t) |
| 1459 | return ret; |
| 1460 | |
| 1461 | switch(cmd) { |
| 1462 | case EBT_SO_GET_INFO: |
| 1463 | case EBT_SO_GET_INIT_INFO: |
| 1464 | if (*len != sizeof(struct ebt_replace)){ |
| 1465 | ret = -EINVAL; |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1466 | mutex_unlock(&ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | break; |
| 1468 | } |
| 1469 | if (cmd == EBT_SO_GET_INFO) { |
| 1470 | tmp.nentries = t->private->nentries; |
| 1471 | tmp.entries_size = t->private->entries_size; |
| 1472 | tmp.valid_hooks = t->valid_hooks; |
| 1473 | } else { |
| 1474 | tmp.nentries = t->table->nentries; |
| 1475 | tmp.entries_size = t->table->entries_size; |
| 1476 | tmp.valid_hooks = t->table->valid_hooks; |
| 1477 | } |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1478 | mutex_unlock(&ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | if (copy_to_user(user, &tmp, *len) != 0){ |
| 1480 | BUGPRINT("c2u Didn't work\n"); |
| 1481 | ret = -EFAULT; |
| 1482 | break; |
| 1483 | } |
| 1484 | ret = 0; |
| 1485 | break; |
| 1486 | |
| 1487 | case EBT_SO_GET_ENTRIES: |
| 1488 | case EBT_SO_GET_INIT_ENTRIES: |
| 1489 | ret = copy_everything_to_user(t, user, len, cmd); |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1490 | mutex_unlock(&ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | break; |
| 1492 | |
| 1493 | default: |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1494 | mutex_unlock(&ebt_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | ret = -EINVAL; |
| 1496 | } |
| 1497 | |
| 1498 | return ret; |
| 1499 | } |
| 1500 | |
| 1501 | static struct nf_sockopt_ops ebt_sockopts = |
Andrew Morton | 74ca4e5a | 2006-03-20 22:55:02 -0800 | [diff] [blame] | 1502 | { |
| 1503 | .pf = PF_INET, |
| 1504 | .set_optmin = EBT_BASE_CTL, |
| 1505 | .set_optmax = EBT_SO_SET_MAX + 1, |
| 1506 | .set = do_ebt_set_ctl, |
| 1507 | .get_optmin = EBT_BASE_CTL, |
| 1508 | .get_optmax = EBT_SO_GET_MAX + 1, |
| 1509 | .get = do_ebt_get_ctl, |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 1510 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | }; |
| 1512 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1513 | static int __init ebtables_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | { |
| 1515 | int ret; |
| 1516 | |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 1517 | ret = xt_register_target(&ebt_standard_target); |
| 1518 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | return ret; |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 1520 | ret = nf_register_sockopt(&ebt_sockopts); |
| 1521 | if (ret < 0) { |
| 1522 | xt_unregister_target(&ebt_standard_target); |
| 1523 | return ret; |
| 1524 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | |
Patrick McHardy | a887c1c | 2007-07-14 20:46:15 -0700 | [diff] [blame] | 1526 | printk(KERN_INFO "Ebtables v2.0 registered\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | return 0; |
| 1528 | } |
| 1529 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1530 | static void __exit ebtables_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | { |
| 1532 | nf_unregister_sockopt(&ebt_sockopts); |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 1533 | xt_unregister_target(&ebt_standard_target); |
Patrick McHardy | a887c1c | 2007-07-14 20:46:15 -0700 | [diff] [blame] | 1534 | printk(KERN_INFO "Ebtables v2.0 unregistered\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | } |
| 1536 | |
| 1537 | EXPORT_SYMBOL(ebt_register_table); |
| 1538 | EXPORT_SYMBOL(ebt_unregister_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | EXPORT_SYMBOL(ebt_do_table); |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 1540 | module_init(ebtables_init); |
| 1541 | module_exit(ebtables_fini); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | MODULE_LICENSE("GPL"); |