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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Packet matching code for ARP packets. | |
3 | * | |
4 | * Based heavily, if not almost entirely, upon ip_tables.c framework. | |
5 | * | |
6 | * Some ARP specific bits are: | |
7 | * | |
8 | * Copyright (C) 2002 David S. Miller (davem@redhat.com) | |
f229f6ce | 9 | * Copyright (C) 2006-2009 Patrick McHardy <kaber@trash.net> |
1da177e4 LT |
10 | * |
11 | */ | |
90e7d4ab | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
4fc268d2 | 16 | #include <linux/capability.h> |
1da177e4 LT |
17 | #include <linux/if_arp.h> |
18 | #include <linux/kmod.h> | |
19 | #include <linux/vmalloc.h> | |
20 | #include <linux/proc_fs.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
57b47a53 | 23 | #include <linux/mutex.h> |
d6a2ba07 PM |
24 | #include <linux/err.h> |
25 | #include <net/compat.h> | |
79df341a | 26 | #include <net/sock.h> |
d6a2ba07 | 27 | #include <asm/uaccess.h> |
1da177e4 | 28 | |
2e4e6a17 | 29 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 30 | #include <linux/netfilter_arp/arp_tables.h> |
e3eaa991 | 31 | #include "../../netfilter/xt_repldata.h" |
1da177e4 LT |
32 | |
33 | MODULE_LICENSE("GPL"); | |
34 | MODULE_AUTHOR("David S. Miller <davem@redhat.com>"); | |
35 | MODULE_DESCRIPTION("arptables core"); | |
36 | ||
37 | /*#define DEBUG_ARP_TABLES*/ | |
38 | /*#define DEBUG_ARP_TABLES_USER*/ | |
39 | ||
40 | #ifdef DEBUG_ARP_TABLES | |
41 | #define dprintf(format, args...) printk(format , ## args) | |
42 | #else | |
43 | #define dprintf(format, args...) | |
44 | #endif | |
45 | ||
46 | #ifdef DEBUG_ARP_TABLES_USER | |
47 | #define duprintf(format, args...) printk(format , ## args) | |
48 | #else | |
49 | #define duprintf(format, args...) | |
50 | #endif | |
51 | ||
52 | #ifdef CONFIG_NETFILTER_DEBUG | |
af567603 | 53 | #define ARP_NF_ASSERT(x) WARN_ON(!(x)) |
1da177e4 LT |
54 | #else |
55 | #define ARP_NF_ASSERT(x) | |
56 | #endif | |
1da177e4 | 57 | |
e3eaa991 JE |
58 | void *arpt_alloc_initial_table(const struct xt_table *info) |
59 | { | |
60 | return xt_alloc_initial_table(arpt, ARPT); | |
61 | } | |
62 | EXPORT_SYMBOL_GPL(arpt_alloc_initial_table); | |
63 | ||
1da177e4 | 64 | static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap, |
5452e425 | 65 | const char *hdr_addr, int len) |
1da177e4 LT |
66 | { |
67 | int i, ret; | |
68 | ||
69 | if (len > ARPT_DEV_ADDR_LEN_MAX) | |
70 | len = ARPT_DEV_ADDR_LEN_MAX; | |
71 | ||
72 | ret = 0; | |
73 | for (i = 0; i < len; i++) | |
74 | ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i]; | |
75 | ||
a02cec21 | 76 | return ret != 0; |
1da177e4 LT |
77 | } |
78 | ||
ddc214c4 | 79 | /* |
25985edc | 80 | * Unfortunately, _b and _mask are not aligned to an int (or long int) |
ddc214c4 | 81 | * Some arches dont care, unrolling the loop is a win on them. |
35c7f6de | 82 | * For other arches, we only have a 16bit alignement. |
ddc214c4 ED |
83 | */ |
84 | static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask) | |
85 | { | |
86 | #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS | |
b8dfe498 | 87 | unsigned long ret = ifname_compare_aligned(_a, _b, _mask); |
ddc214c4 ED |
88 | #else |
89 | unsigned long ret = 0; | |
35c7f6de ED |
90 | const u16 *a = (const u16 *)_a; |
91 | const u16 *b = (const u16 *)_b; | |
92 | const u16 *mask = (const u16 *)_mask; | |
ddc214c4 ED |
93 | int i; |
94 | ||
35c7f6de ED |
95 | for (i = 0; i < IFNAMSIZ/sizeof(u16); i++) |
96 | ret |= (a[i] ^ b[i]) & mask[i]; | |
ddc214c4 ED |
97 | #endif |
98 | return ret; | |
99 | } | |
100 | ||
1da177e4 LT |
101 | /* Returns whether packet matches rule or not. */ |
102 | static inline int arp_packet_match(const struct arphdr *arphdr, | |
103 | struct net_device *dev, | |
104 | const char *indev, | |
105 | const char *outdev, | |
106 | const struct arpt_arp *arpinfo) | |
107 | { | |
5452e425 JE |
108 | const char *arpptr = (char *)(arphdr + 1); |
109 | const char *src_devaddr, *tgt_devaddr; | |
59b8bfd8 | 110 | __be32 src_ipaddr, tgt_ipaddr; |
ddc214c4 | 111 | long ret; |
1da177e4 | 112 | |
e79ec50b | 113 | #define FWINV(bool, invflg) ((bool) ^ !!(arpinfo->invflags & (invflg))) |
1da177e4 LT |
114 | |
115 | if (FWINV((arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop, | |
116 | ARPT_INV_ARPOP)) { | |
117 | dprintf("ARP operation field mismatch.\n"); | |
118 | dprintf("ar_op: %04x info->arpop: %04x info->arpop_mask: %04x\n", | |
119 | arphdr->ar_op, arpinfo->arpop, arpinfo->arpop_mask); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | if (FWINV((arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd, | |
124 | ARPT_INV_ARPHRD)) { | |
125 | dprintf("ARP hardware address format mismatch.\n"); | |
126 | dprintf("ar_hrd: %04x info->arhrd: %04x info->arhrd_mask: %04x\n", | |
127 | arphdr->ar_hrd, arpinfo->arhrd, arpinfo->arhrd_mask); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | if (FWINV((arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro, | |
132 | ARPT_INV_ARPPRO)) { | |
133 | dprintf("ARP protocol address format mismatch.\n"); | |
134 | dprintf("ar_pro: %04x info->arpro: %04x info->arpro_mask: %04x\n", | |
135 | arphdr->ar_pro, arpinfo->arpro, arpinfo->arpro_mask); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | if (FWINV((arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln, | |
140 | ARPT_INV_ARPHLN)) { | |
141 | dprintf("ARP hardware address length mismatch.\n"); | |
142 | dprintf("ar_hln: %02x info->arhln: %02x info->arhln_mask: %02x\n", | |
143 | arphdr->ar_hln, arpinfo->arhln, arpinfo->arhln_mask); | |
144 | return 0; | |
145 | } | |
146 | ||
147 | src_devaddr = arpptr; | |
148 | arpptr += dev->addr_len; | |
149 | memcpy(&src_ipaddr, arpptr, sizeof(u32)); | |
150 | arpptr += sizeof(u32); | |
151 | tgt_devaddr = arpptr; | |
152 | arpptr += dev->addr_len; | |
153 | memcpy(&tgt_ipaddr, arpptr, sizeof(u32)); | |
154 | ||
155 | if (FWINV(arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, dev->addr_len), | |
156 | ARPT_INV_SRCDEVADDR) || | |
157 | FWINV(arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, dev->addr_len), | |
158 | ARPT_INV_TGTDEVADDR)) { | |
159 | dprintf("Source or target device address mismatch.\n"); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | if (FWINV((src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr, | |
165 | ARPT_INV_SRCIP) || | |
166 | FWINV(((tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr), | |
167 | ARPT_INV_TGTIP)) { | |
168 | dprintf("Source or target IP address mismatch.\n"); | |
169 | ||
cffee385 HH |
170 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
171 | &src_ipaddr, | |
172 | &arpinfo->smsk.s_addr, | |
173 | &arpinfo->src.s_addr, | |
1da177e4 | 174 | arpinfo->invflags & ARPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
175 | dprintf("TGT: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
176 | &tgt_ipaddr, | |
177 | &arpinfo->tmsk.s_addr, | |
178 | &arpinfo->tgt.s_addr, | |
1da177e4 LT |
179 | arpinfo->invflags & ARPT_INV_TGTIP ? " (INV)" : ""); |
180 | return 0; | |
181 | } | |
182 | ||
183 | /* Look for ifname matches. */ | |
ddc214c4 | 184 | ret = ifname_compare(indev, arpinfo->iniface, arpinfo->iniface_mask); |
1da177e4 LT |
185 | |
186 | if (FWINV(ret != 0, ARPT_INV_VIA_IN)) { | |
187 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
188 | indev, arpinfo->iniface, | |
189 | arpinfo->invflags&ARPT_INV_VIA_IN ?" (INV)":""); | |
190 | return 0; | |
191 | } | |
192 | ||
ddc214c4 | 193 | ret = ifname_compare(outdev, arpinfo->outiface, arpinfo->outiface_mask); |
1da177e4 LT |
194 | |
195 | if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) { | |
196 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
197 | outdev, arpinfo->outiface, | |
198 | arpinfo->invflags&ARPT_INV_VIA_OUT ?" (INV)":""); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | return 1; | |
e79ec50b | 203 | #undef FWINV |
1da177e4 LT |
204 | } |
205 | ||
206 | static inline int arp_checkentry(const struct arpt_arp *arp) | |
207 | { | |
208 | if (arp->flags & ~ARPT_F_MASK) { | |
209 | duprintf("Unknown flag bits set: %08X\n", | |
210 | arp->flags & ~ARPT_F_MASK); | |
211 | return 0; | |
212 | } | |
213 | if (arp->invflags & ~ARPT_INV_MASK) { | |
214 | duprintf("Unknown invflag bits set: %08X\n", | |
215 | arp->invflags & ~ARPT_INV_MASK); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | return 1; | |
220 | } | |
221 | ||
7eb35586 | 222 | static unsigned int |
4b560b44 | 223 | arpt_error(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 224 | { |
e87cc472 JP |
225 | net_err_ratelimited("arp_tables: error: '%s'\n", |
226 | (const char *)par->targinfo); | |
1da177e4 LT |
227 | |
228 | return NF_DROP; | |
229 | } | |
230 | ||
87a2e70d | 231 | static inline const struct xt_entry_target * |
d5d1baa1 JE |
232 | arpt_get_target_c(const struct arpt_entry *e) |
233 | { | |
234 | return arpt_get_target((struct arpt_entry *)e); | |
235 | } | |
236 | ||
237 | static inline struct arpt_entry * | |
238 | get_entry(const void *base, unsigned int offset) | |
1da177e4 LT |
239 | { |
240 | return (struct arpt_entry *)(base + offset); | |
241 | } | |
242 | ||
6c7941de | 243 | static inline |
98e86403 JE |
244 | struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry) |
245 | { | |
246 | return (void *)entry + entry->next_offset; | |
247 | } | |
248 | ||
3db05fea | 249 | unsigned int arpt_do_table(struct sk_buff *skb, |
1da177e4 | 250 | unsigned int hook, |
b85c3dc9 | 251 | const struct nf_hook_state *state, |
4abff077 | 252 | struct xt_table *table) |
1da177e4 | 253 | { |
ddc214c4 | 254 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 | 255 | unsigned int verdict = NF_DROP; |
5452e425 | 256 | const struct arphdr *arp; |
3bd22997 | 257 | struct arpt_entry *e, **jumpstack; |
1da177e4 | 258 | const char *indev, *outdev; |
711bdde6 | 259 | const void *table_base; |
3bd22997 | 260 | unsigned int cpu, stackidx = 0; |
5452e425 | 261 | const struct xt_table_info *private; |
de74c169 | 262 | struct xt_action_param acpar; |
7f5c6d4f | 263 | unsigned int addend; |
1da177e4 | 264 | |
988b7050 | 265 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
266 | return NF_DROP; |
267 | ||
b85c3dc9 DM |
268 | indev = state->in ? state->in->name : nulldevname; |
269 | outdev = state->out ? state->out->name : nulldevname; | |
1da177e4 | 270 | |
7f5c6d4f ED |
271 | local_bh_disable(); |
272 | addend = xt_write_recseq_begin(); | |
942e4a2b | 273 | private = table->private; |
3bd22997 | 274 | cpu = smp_processor_id(); |
b416c144 WD |
275 | /* |
276 | * Ensure we load private-> members after we've fetched the base | |
277 | * pointer. | |
278 | */ | |
279 | smp_read_barrier_depends(); | |
482cfc31 | 280 | table_base = private->entries; |
3bd22997 | 281 | jumpstack = (struct arpt_entry **)private->jumpstack[cpu]; |
78454473 | 282 | |
7814b6ec FW |
283 | /* No TEE support for arptables, so no need to switch to alternate |
284 | * stack. All targets that reenter must return absolute verdicts. | |
285 | */ | |
2e4e6a17 | 286 | e = get_entry(table_base, private->hook_entry[hook]); |
1da177e4 | 287 | |
b85c3dc9 DM |
288 | acpar.in = state->in; |
289 | acpar.out = state->out; | |
de74c169 JE |
290 | acpar.hooknum = hook; |
291 | acpar.family = NFPROTO_ARP; | |
b4ba2611 | 292 | acpar.hotdrop = false; |
7eb35586 | 293 | |
3db05fea | 294 | arp = arp_hdr(skb); |
1da177e4 | 295 | do { |
87a2e70d | 296 | const struct xt_entry_target *t; |
71ae0dff | 297 | struct xt_counters *counter; |
a1ff4ac8 JE |
298 | |
299 | if (!arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) { | |
300 | e = arpt_next_entry(e); | |
301 | continue; | |
302 | } | |
303 | ||
71ae0dff FW |
304 | counter = xt_get_this_cpu_counter(&e->counters); |
305 | ADD_COUNTER(*counter, arp_hdr_len(skb->dev), 1); | |
1da177e4 | 306 | |
d5d1baa1 | 307 | t = arpt_get_target_c(e); |
a1ff4ac8 JE |
308 | |
309 | /* Standard target? */ | |
310 | if (!t->u.kernel.target->target) { | |
311 | int v; | |
312 | ||
87a2e70d | 313 | v = ((struct xt_standard_target *)t)->verdict; |
a1ff4ac8 JE |
314 | if (v < 0) { |
315 | /* Pop from stack? */ | |
243bf6e2 | 316 | if (v != XT_RETURN) { |
95c96174 | 317 | verdict = (unsigned int)(-v) - 1; |
1da177e4 | 318 | break; |
a1ff4ac8 | 319 | } |
3bd22997 FW |
320 | if (stackidx == 0) { |
321 | e = get_entry(table_base, | |
322 | private->underflow[hook]); | |
323 | } else { | |
324 | e = jumpstack[--stackidx]; | |
325 | e = arpt_next_entry(e); | |
326 | } | |
a1ff4ac8 | 327 | continue; |
1da177e4 | 328 | } |
a1ff4ac8 JE |
329 | if (table_base + v |
330 | != arpt_next_entry(e)) { | |
3bd22997 | 331 | jumpstack[stackidx++] = e; |
a1ff4ac8 JE |
332 | } |
333 | ||
334 | e = get_entry(table_base, v); | |
7a6b1c46 | 335 | continue; |
1da177e4 | 336 | } |
7a6b1c46 | 337 | |
de74c169 JE |
338 | acpar.target = t->u.kernel.target; |
339 | acpar.targinfo = t->data; | |
340 | verdict = t->u.kernel.target->target(skb, &acpar); | |
7a6b1c46 JE |
341 | |
342 | /* Target might have changed stuff. */ | |
343 | arp = arp_hdr(skb); | |
344 | ||
243bf6e2 | 345 | if (verdict == XT_CONTINUE) |
7a6b1c46 JE |
346 | e = arpt_next_entry(e); |
347 | else | |
348 | /* Verdict */ | |
349 | break; | |
b4ba2611 | 350 | } while (!acpar.hotdrop); |
7f5c6d4f ED |
351 | xt_write_recseq_end(addend); |
352 | local_bh_enable(); | |
1da177e4 | 353 | |
b4ba2611 | 354 | if (acpar.hotdrop) |
1da177e4 LT |
355 | return NF_DROP; |
356 | else | |
357 | return verdict; | |
358 | } | |
359 | ||
1da177e4 | 360 | /* All zeroes == unconditional rule. */ |
47901dc2 | 361 | static inline bool unconditional(const struct arpt_arp *arp) |
1da177e4 | 362 | { |
47901dc2 | 363 | static const struct arpt_arp uncond; |
1da177e4 | 364 | |
47901dc2 | 365 | return memcmp(arp, &uncond, sizeof(uncond)) == 0; |
1da177e4 LT |
366 | } |
367 | ||
368 | /* Figures out from what hook each rule can be called: returns 0 if | |
369 | * there are loops. Puts hook bitmask in comefrom. | |
98d1bd80 FW |
370 | * |
371 | * Keeps track of largest call depth seen and stores it in newinfo->stacksize. | |
1da177e4 | 372 | */ |
98d1bd80 | 373 | static int mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 374 | unsigned int valid_hooks, void *entry0) |
1da177e4 | 375 | { |
98d1bd80 | 376 | unsigned int calldepth, max_calldepth = 0; |
1da177e4 LT |
377 | unsigned int hook; |
378 | ||
379 | /* No recursion; use packet counter to save back ptrs (reset | |
380 | * to 0 as we leave), and comefrom to save source hook bitmask. | |
381 | */ | |
382 | for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) { | |
383 | unsigned int pos = newinfo->hook_entry[hook]; | |
384 | struct arpt_entry *e | |
31836064 | 385 | = (struct arpt_entry *)(entry0 + pos); |
1da177e4 LT |
386 | |
387 | if (!(valid_hooks & (1 << hook))) | |
388 | continue; | |
389 | ||
390 | /* Set initial back pointer. */ | |
391 | e->counters.pcnt = pos; | |
98d1bd80 | 392 | calldepth = 0; |
1da177e4 LT |
393 | |
394 | for (;;) { | |
87a2e70d | 395 | const struct xt_standard_target *t |
d5d1baa1 | 396 | = (void *)arpt_get_target_c(e); |
e1b4b9f3 | 397 | int visited = e->comefrom & (1 << hook); |
1da177e4 LT |
398 | |
399 | if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) { | |
654d0fbd | 400 | pr_notice("arptables: loop hook %u pos %u %08X.\n", |
1da177e4 LT |
401 | hook, pos, e->comefrom); |
402 | return 0; | |
403 | } | |
404 | e->comefrom | |
405 | |= ((1 << hook) | (1 << NF_ARP_NUMHOOKS)); | |
406 | ||
407 | /* Unconditional return/END. */ | |
3666ed1c JP |
408 | if ((e->target_offset == sizeof(struct arpt_entry) && |
409 | (strcmp(t->target.u.user.name, | |
243bf6e2 | 410 | XT_STANDARD_TARGET) == 0) && |
3666ed1c JP |
411 | t->verdict < 0 && unconditional(&e->arp)) || |
412 | visited) { | |
1da177e4 LT |
413 | unsigned int oldpos, size; |
414 | ||
1f9352ae | 415 | if ((strcmp(t->target.u.user.name, |
243bf6e2 | 416 | XT_STANDARD_TARGET) == 0) && |
1f9352ae | 417 | t->verdict < -NF_MAX_VERDICT - 1) { |
74c9c0c1 DM |
418 | duprintf("mark_source_chains: bad " |
419 | "negative verdict (%i)\n", | |
420 | t->verdict); | |
421 | return 0; | |
422 | } | |
423 | ||
1da177e4 LT |
424 | /* Return: backtrack through the last |
425 | * big jump. | |
426 | */ | |
427 | do { | |
428 | e->comefrom ^= (1<<NF_ARP_NUMHOOKS); | |
429 | oldpos = pos; | |
430 | pos = e->counters.pcnt; | |
431 | e->counters.pcnt = 0; | |
432 | ||
433 | /* We're at the start. */ | |
434 | if (pos == oldpos) | |
435 | goto next; | |
436 | ||
437 | e = (struct arpt_entry *) | |
31836064 | 438 | (entry0 + pos); |
1da177e4 LT |
439 | } while (oldpos == pos + e->next_offset); |
440 | ||
441 | /* Move along one */ | |
442 | size = e->next_offset; | |
443 | e = (struct arpt_entry *) | |
31836064 | 444 | (entry0 + pos + size); |
1da177e4 LT |
445 | e->counters.pcnt = pos; |
446 | pos += size; | |
98d1bd80 FW |
447 | if (calldepth > 0) |
448 | --calldepth; | |
1da177e4 LT |
449 | } else { |
450 | int newpos = t->verdict; | |
451 | ||
452 | if (strcmp(t->target.u.user.name, | |
243bf6e2 | 453 | XT_STANDARD_TARGET) == 0 && |
3666ed1c | 454 | newpos >= 0) { |
74c9c0c1 DM |
455 | if (newpos > newinfo->size - |
456 | sizeof(struct arpt_entry)) { | |
457 | duprintf("mark_source_chains: " | |
458 | "bad verdict (%i)\n", | |
459 | newpos); | |
460 | return 0; | |
461 | } | |
462 | ||
98d1bd80 FW |
463 | if (entry0 + newpos != arpt_next_entry(e) && |
464 | ++calldepth > max_calldepth) | |
465 | max_calldepth = calldepth; | |
466 | ||
1da177e4 LT |
467 | /* This a jump; chase it. */ |
468 | duprintf("Jump rule %u -> %u\n", | |
469 | pos, newpos); | |
470 | } else { | |
471 | /* ... this is a fallthru */ | |
472 | newpos = pos + e->next_offset; | |
473 | } | |
474 | e = (struct arpt_entry *) | |
31836064 | 475 | (entry0 + newpos); |
1da177e4 LT |
476 | e->counters.pcnt = pos; |
477 | pos = newpos; | |
478 | } | |
479 | } | |
480 | next: | |
481 | duprintf("Finished chain %u\n", hook); | |
482 | } | |
98d1bd80 | 483 | newinfo->stacksize = max_calldepth; |
1da177e4 LT |
484 | return 1; |
485 | } | |
486 | ||
d5d1baa1 | 487 | static inline int check_entry(const struct arpt_entry *e, const char *name) |
1da177e4 | 488 | { |
87a2e70d | 489 | const struct xt_entry_target *t; |
1da177e4 LT |
490 | |
491 | if (!arp_checkentry(&e->arp)) { | |
492 | duprintf("arp_tables: arp check failed %p %s.\n", e, name); | |
493 | return -EINVAL; | |
494 | } | |
495 | ||
87a2e70d | 496 | if (e->target_offset + sizeof(struct xt_entry_target) > e->next_offset) |
590bdf7f DM |
497 | return -EINVAL; |
498 | ||
d5d1baa1 | 499 | t = arpt_get_target_c(e); |
590bdf7f DM |
500 | if (e->target_offset + t->u.target_size > e->next_offset) |
501 | return -EINVAL; | |
502 | ||
fb5b6095 PM |
503 | return 0; |
504 | } | |
505 | ||
506 | static inline int check_target(struct arpt_entry *e, const char *name) | |
507 | { | |
87a2e70d | 508 | struct xt_entry_target *t = arpt_get_target(e); |
fb5b6095 | 509 | int ret; |
af5d6dc2 JE |
510 | struct xt_tgchk_param par = { |
511 | .table = name, | |
512 | .entryinfo = e, | |
513 | .target = t->u.kernel.target, | |
514 | .targinfo = t->data, | |
515 | .hook_mask = e->comefrom, | |
916a917d | 516 | .family = NFPROTO_ARP, |
af5d6dc2 JE |
517 | }; |
518 | ||
916a917d | 519 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false); |
367c6790 | 520 | if (ret < 0) { |
fb5b6095 PM |
521 | duprintf("arp_tables: check failed for `%s'.\n", |
522 | t->u.kernel.target->name); | |
367c6790 | 523 | return ret; |
fb5b6095 | 524 | } |
367c6790 | 525 | return 0; |
fb5b6095 PM |
526 | } |
527 | ||
528 | static inline int | |
0559518b | 529 | find_check_entry(struct arpt_entry *e, const char *name, unsigned int size) |
fb5b6095 | 530 | { |
87a2e70d | 531 | struct xt_entry_target *t; |
95eea855 | 532 | struct xt_target *target; |
fb5b6095 PM |
533 | int ret; |
534 | ||
535 | ret = check_entry(e, name); | |
536 | if (ret) | |
537 | return ret; | |
538 | ||
71ae0dff FW |
539 | e->counters.pcnt = xt_percpu_counter_alloc(); |
540 | if (IS_ERR_VALUE(e->counters.pcnt)) | |
541 | return -ENOMEM; | |
542 | ||
fb5b6095 | 543 | t = arpt_get_target(e); |
d2a7b6ba JE |
544 | target = xt_request_find_target(NFPROTO_ARP, t->u.user.name, |
545 | t->u.user.revision); | |
546 | if (IS_ERR(target)) { | |
fb5b6095 | 547 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
d2a7b6ba | 548 | ret = PTR_ERR(target); |
1da177e4 LT |
549 | goto out; |
550 | } | |
1da177e4 | 551 | t->u.kernel.target = target; |
1da177e4 | 552 | |
fb5b6095 | 553 | ret = check_target(e, name); |
3cdc7c95 PM |
554 | if (ret) |
555 | goto err; | |
1da177e4 | 556 | return 0; |
3cdc7c95 PM |
557 | err: |
558 | module_put(t->u.kernel.target->me); | |
1da177e4 | 559 | out: |
71ae0dff FW |
560 | xt_percpu_counter_free(e->counters.pcnt); |
561 | ||
1da177e4 LT |
562 | return ret; |
563 | } | |
564 | ||
d5d1baa1 | 565 | static bool check_underflow(const struct arpt_entry *e) |
e2fe35c1 | 566 | { |
87a2e70d | 567 | const struct xt_entry_target *t; |
e2fe35c1 JE |
568 | unsigned int verdict; |
569 | ||
570 | if (!unconditional(&e->arp)) | |
571 | return false; | |
d5d1baa1 | 572 | t = arpt_get_target_c(e); |
e2fe35c1 JE |
573 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) |
574 | return false; | |
87a2e70d | 575 | verdict = ((struct xt_standard_target *)t)->verdict; |
e2fe35c1 JE |
576 | verdict = -verdict - 1; |
577 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
578 | } | |
579 | ||
1da177e4 | 580 | static inline int check_entry_size_and_hooks(struct arpt_entry *e, |
2e4e6a17 | 581 | struct xt_table_info *newinfo, |
d5d1baa1 JE |
582 | const unsigned char *base, |
583 | const unsigned char *limit, | |
1da177e4 LT |
584 | const unsigned int *hook_entries, |
585 | const unsigned int *underflows, | |
0559518b | 586 | unsigned int valid_hooks) |
1da177e4 LT |
587 | { |
588 | unsigned int h; | |
589 | ||
3666ed1c JP |
590 | if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 || |
591 | (unsigned char *)e + sizeof(struct arpt_entry) >= limit) { | |
1da177e4 LT |
592 | duprintf("Bad offset %p\n", e); |
593 | return -EINVAL; | |
594 | } | |
595 | ||
596 | if (e->next_offset | |
87a2e70d | 597 | < sizeof(struct arpt_entry) + sizeof(struct xt_entry_target)) { |
1da177e4 LT |
598 | duprintf("checking: element %p size %u\n", |
599 | e, e->next_offset); | |
600 | return -EINVAL; | |
601 | } | |
602 | ||
603 | /* Check hooks & underflows */ | |
604 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
a7d51738 JE |
605 | if (!(valid_hooks & (1 << h))) |
606 | continue; | |
1da177e4 LT |
607 | if ((unsigned char *)e - base == hook_entries[h]) |
608 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 609 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
610 | if (!check_underflow(e)) { |
611 | pr_err("Underflows must be unconditional and " | |
612 | "use the STANDARD target with " | |
613 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
614 | return -EINVAL; |
615 | } | |
1da177e4 | 616 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 617 | } |
1da177e4 LT |
618 | } |
619 | ||
1da177e4 | 620 | /* Clear counters and comefrom */ |
2e4e6a17 | 621 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 | 622 | e->comefrom = 0; |
1da177e4 LT |
623 | return 0; |
624 | } | |
625 | ||
0559518b | 626 | static inline void cleanup_entry(struct arpt_entry *e) |
1da177e4 | 627 | { |
a2df1648 | 628 | struct xt_tgdtor_param par; |
87a2e70d | 629 | struct xt_entry_target *t; |
1da177e4 | 630 | |
1da177e4 | 631 | t = arpt_get_target(e); |
a2df1648 JE |
632 | par.target = t->u.kernel.target; |
633 | par.targinfo = t->data; | |
916a917d | 634 | par.family = NFPROTO_ARP; |
a2df1648 JE |
635 | if (par.target->destroy != NULL) |
636 | par.target->destroy(&par); | |
637 | module_put(par.target->me); | |
71ae0dff | 638 | xt_percpu_counter_free(e->counters.pcnt); |
1da177e4 LT |
639 | } |
640 | ||
641 | /* Checks and translates the user-supplied table segment (held in | |
642 | * newinfo). | |
643 | */ | |
0f234214 JE |
644 | static int translate_table(struct xt_table_info *newinfo, void *entry0, |
645 | const struct arpt_replace *repl) | |
1da177e4 | 646 | { |
72b2b1dd | 647 | struct arpt_entry *iter; |
1da177e4 | 648 | unsigned int i; |
72b2b1dd | 649 | int ret = 0; |
1da177e4 | 650 | |
0f234214 JE |
651 | newinfo->size = repl->size; |
652 | newinfo->number = repl->num_entries; | |
1da177e4 LT |
653 | |
654 | /* Init all hooks to impossible value. */ | |
655 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
656 | newinfo->hook_entry[i] = 0xFFFFFFFF; | |
657 | newinfo->underflow[i] = 0xFFFFFFFF; | |
658 | } | |
659 | ||
660 | duprintf("translate_table: size %u\n", newinfo->size); | |
661 | i = 0; | |
662 | ||
663 | /* Walk through entries, checking offsets. */ | |
72b2b1dd JE |
664 | xt_entry_foreach(iter, entry0, newinfo->size) { |
665 | ret = check_entry_size_and_hooks(iter, newinfo, entry0, | |
6b4ff2d7 JE |
666 | entry0 + repl->size, |
667 | repl->hook_entry, | |
668 | repl->underflow, | |
669 | repl->valid_hooks); | |
72b2b1dd JE |
670 | if (ret != 0) |
671 | break; | |
0559518b | 672 | ++i; |
72b2b1dd | 673 | } |
1da177e4 LT |
674 | duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret); |
675 | if (ret != 0) | |
676 | return ret; | |
677 | ||
0f234214 | 678 | if (i != repl->num_entries) { |
1da177e4 | 679 | duprintf("translate_table: %u not %u entries\n", |
0f234214 | 680 | i, repl->num_entries); |
1da177e4 LT |
681 | return -EINVAL; |
682 | } | |
683 | ||
684 | /* Check hooks all assigned */ | |
685 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
686 | /* Only hooks which are valid */ | |
0f234214 | 687 | if (!(repl->valid_hooks & (1 << i))) |
1da177e4 LT |
688 | continue; |
689 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
690 | duprintf("Invalid hook entry %u %u\n", | |
0f234214 | 691 | i, repl->hook_entry[i]); |
1da177e4 LT |
692 | return -EINVAL; |
693 | } | |
694 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
695 | duprintf("Invalid underflow %u %u\n", | |
0f234214 | 696 | i, repl->underflow[i]); |
1da177e4 LT |
697 | return -EINVAL; |
698 | } | |
699 | } | |
700 | ||
0f234214 | 701 | if (!mark_source_chains(newinfo, repl->valid_hooks, entry0)) { |
74c9c0c1 DM |
702 | duprintf("Looping hook\n"); |
703 | return -ELOOP; | |
704 | } | |
705 | ||
1da177e4 LT |
706 | /* Finally, each sanity check must pass */ |
707 | i = 0; | |
72b2b1dd | 708 | xt_entry_foreach(iter, entry0, newinfo->size) { |
0f234214 | 709 | ret = find_check_entry(iter, repl->name, repl->size); |
72b2b1dd JE |
710 | if (ret != 0) |
711 | break; | |
0559518b | 712 | ++i; |
72b2b1dd | 713 | } |
1da177e4 | 714 | |
74c9c0c1 | 715 | if (ret != 0) { |
0559518b JE |
716 | xt_entry_foreach(iter, entry0, newinfo->size) { |
717 | if (i-- == 0) | |
72b2b1dd | 718 | break; |
0559518b JE |
719 | cleanup_entry(iter); |
720 | } | |
74c9c0c1 | 721 | return ret; |
1da177e4 LT |
722 | } |
723 | ||
1da177e4 LT |
724 | return ret; |
725 | } | |
726 | ||
2e4e6a17 HW |
727 | static void get_counters(const struct xt_table_info *t, |
728 | struct xt_counters counters[]) | |
1da177e4 | 729 | { |
72b2b1dd | 730 | struct arpt_entry *iter; |
1da177e4 LT |
731 | unsigned int cpu; |
732 | unsigned int i; | |
733 | ||
6f912042 | 734 | for_each_possible_cpu(cpu) { |
7f5c6d4f | 735 | seqcount_t *s = &per_cpu(xt_recseq, cpu); |
83723d60 | 736 | |
1da177e4 | 737 | i = 0; |
482cfc31 | 738 | xt_entry_foreach(iter, t->entries, t->size) { |
71ae0dff | 739 | struct xt_counters *tmp; |
83723d60 ED |
740 | u64 bcnt, pcnt; |
741 | unsigned int start; | |
742 | ||
71ae0dff | 743 | tmp = xt_get_per_cpu_counter(&iter->counters, cpu); |
83723d60 | 744 | do { |
7f5c6d4f | 745 | start = read_seqcount_begin(s); |
71ae0dff FW |
746 | bcnt = tmp->bcnt; |
747 | pcnt = tmp->pcnt; | |
7f5c6d4f | 748 | } while (read_seqcount_retry(s, start)); |
83723d60 ED |
749 | |
750 | ADD_COUNTER(counters[i], bcnt, pcnt); | |
0559518b JE |
751 | ++i; |
752 | } | |
1da177e4 | 753 | } |
78454473 SH |
754 | } |
755 | ||
d5d1baa1 | 756 | static struct xt_counters *alloc_counters(const struct xt_table *table) |
1da177e4 | 757 | { |
27e2c26b | 758 | unsigned int countersize; |
2e4e6a17 | 759 | struct xt_counters *counters; |
d5d1baa1 | 760 | const struct xt_table_info *private = table->private; |
1da177e4 LT |
761 | |
762 | /* We need atomic snapshot of counters: rest doesn't change | |
763 | * (other than comefrom, which userspace doesn't care | |
764 | * about). | |
765 | */ | |
2e4e6a17 | 766 | countersize = sizeof(struct xt_counters) * private->number; |
83723d60 | 767 | counters = vzalloc(countersize); |
1da177e4 LT |
768 | |
769 | if (counters == NULL) | |
942e4a2b | 770 | return ERR_PTR(-ENOMEM); |
78454473 | 771 | |
942e4a2b | 772 | get_counters(private, counters); |
1da177e4 | 773 | |
27e2c26b PM |
774 | return counters; |
775 | } | |
776 | ||
777 | static int copy_entries_to_user(unsigned int total_size, | |
d5d1baa1 | 778 | const struct xt_table *table, |
27e2c26b PM |
779 | void __user *userptr) |
780 | { | |
781 | unsigned int off, num; | |
d5d1baa1 | 782 | const struct arpt_entry *e; |
27e2c26b | 783 | struct xt_counters *counters; |
4abff077 | 784 | struct xt_table_info *private = table->private; |
27e2c26b PM |
785 | int ret = 0; |
786 | void *loc_cpu_entry; | |
787 | ||
788 | counters = alloc_counters(table); | |
789 | if (IS_ERR(counters)) | |
790 | return PTR_ERR(counters); | |
791 | ||
482cfc31 | 792 | loc_cpu_entry = private->entries; |
31836064 ED |
793 | /* ... then copy entire thing ... */ |
794 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { | |
1da177e4 LT |
795 | ret = -EFAULT; |
796 | goto free_counters; | |
797 | } | |
798 | ||
799 | /* FIXME: use iterator macros --RR */ | |
800 | /* ... then go back and fix counters and names */ | |
801 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
87a2e70d | 802 | const struct xt_entry_target *t; |
1da177e4 | 803 | |
31836064 | 804 | e = (struct arpt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
805 | if (copy_to_user(userptr + off |
806 | + offsetof(struct arpt_entry, counters), | |
807 | &counters[num], | |
808 | sizeof(counters[num])) != 0) { | |
809 | ret = -EFAULT; | |
810 | goto free_counters; | |
811 | } | |
812 | ||
d5d1baa1 | 813 | t = arpt_get_target_c(e); |
1da177e4 | 814 | if (copy_to_user(userptr + off + e->target_offset |
87a2e70d | 815 | + offsetof(struct xt_entry_target, |
1da177e4 LT |
816 | u.user.name), |
817 | t->u.kernel.target->name, | |
818 | strlen(t->u.kernel.target->name)+1) != 0) { | |
819 | ret = -EFAULT; | |
820 | goto free_counters; | |
821 | } | |
822 | } | |
823 | ||
824 | free_counters: | |
825 | vfree(counters); | |
826 | return ret; | |
827 | } | |
828 | ||
d6a2ba07 | 829 | #ifdef CONFIG_COMPAT |
739674fb | 830 | static void compat_standard_from_user(void *dst, const void *src) |
d6a2ba07 PM |
831 | { |
832 | int v = *(compat_int_t *)src; | |
833 | ||
834 | if (v > 0) | |
ee999d8b | 835 | v += xt_compat_calc_jump(NFPROTO_ARP, v); |
d6a2ba07 PM |
836 | memcpy(dst, &v, sizeof(v)); |
837 | } | |
838 | ||
739674fb | 839 | static int compat_standard_to_user(void __user *dst, const void *src) |
d6a2ba07 PM |
840 | { |
841 | compat_int_t cv = *(int *)src; | |
842 | ||
843 | if (cv > 0) | |
ee999d8b | 844 | cv -= xt_compat_calc_jump(NFPROTO_ARP, cv); |
d6a2ba07 PM |
845 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
846 | } | |
847 | ||
d5d1baa1 | 848 | static int compat_calc_entry(const struct arpt_entry *e, |
d6a2ba07 | 849 | const struct xt_table_info *info, |
d5d1baa1 | 850 | const void *base, struct xt_table_info *newinfo) |
d6a2ba07 | 851 | { |
87a2e70d | 852 | const struct xt_entry_target *t; |
d6a2ba07 PM |
853 | unsigned int entry_offset; |
854 | int off, i, ret; | |
855 | ||
856 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
857 | entry_offset = (void *)e - base; | |
858 | ||
d5d1baa1 | 859 | t = arpt_get_target_c(e); |
d6a2ba07 PM |
860 | off += xt_compat_target_offset(t->u.kernel.target); |
861 | newinfo->size -= off; | |
ee999d8b | 862 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
d6a2ba07 PM |
863 | if (ret) |
864 | return ret; | |
865 | ||
866 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
867 | if (info->hook_entry[i] && | |
868 | (e < (struct arpt_entry *)(base + info->hook_entry[i]))) | |
869 | newinfo->hook_entry[i] -= off; | |
870 | if (info->underflow[i] && | |
871 | (e < (struct arpt_entry *)(base + info->underflow[i]))) | |
872 | newinfo->underflow[i] -= off; | |
873 | } | |
874 | return 0; | |
875 | } | |
876 | ||
877 | static int compat_table_info(const struct xt_table_info *info, | |
878 | struct xt_table_info *newinfo) | |
879 | { | |
72b2b1dd | 880 | struct arpt_entry *iter; |
711bdde6 | 881 | const void *loc_cpu_entry; |
0559518b | 882 | int ret; |
d6a2ba07 PM |
883 | |
884 | if (!newinfo || !info) | |
885 | return -EINVAL; | |
886 | ||
482cfc31 | 887 | /* we dont care about newinfo->entries */ |
d6a2ba07 PM |
888 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); |
889 | newinfo->initial_entries = 0; | |
482cfc31 | 890 | loc_cpu_entry = info->entries; |
255d0dc3 | 891 | xt_compat_init_offsets(NFPROTO_ARP, info->number); |
72b2b1dd JE |
892 | xt_entry_foreach(iter, loc_cpu_entry, info->size) { |
893 | ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); | |
894 | if (ret != 0) | |
0559518b | 895 | return ret; |
72b2b1dd | 896 | } |
0559518b | 897 | return 0; |
d6a2ba07 PM |
898 | } |
899 | #endif | |
900 | ||
d5d1baa1 JE |
901 | static int get_info(struct net *net, void __user *user, |
902 | const int *len, int compat) | |
41acd975 | 903 | { |
12b00c2c | 904 | char name[XT_TABLE_MAXNAMELEN]; |
4abff077 | 905 | struct xt_table *t; |
41acd975 PM |
906 | int ret; |
907 | ||
908 | if (*len != sizeof(struct arpt_getinfo)) { | |
909 | duprintf("length %u != %Zu\n", *len, | |
910 | sizeof(struct arpt_getinfo)); | |
911 | return -EINVAL; | |
912 | } | |
913 | ||
914 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
915 | return -EFAULT; | |
916 | ||
12b00c2c | 917 | name[XT_TABLE_MAXNAMELEN-1] = '\0'; |
d6a2ba07 PM |
918 | #ifdef CONFIG_COMPAT |
919 | if (compat) | |
ee999d8b | 920 | xt_compat_lock(NFPROTO_ARP); |
d6a2ba07 | 921 | #endif |
ee999d8b | 922 | t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name), |
41acd975 | 923 | "arptable_%s", name); |
0cc8d8df | 924 | if (!IS_ERR_OR_NULL(t)) { |
41acd975 | 925 | struct arpt_getinfo info; |
5452e425 | 926 | const struct xt_table_info *private = t->private; |
d6a2ba07 | 927 | #ifdef CONFIG_COMPAT |
14c7dbe0 AD |
928 | struct xt_table_info tmp; |
929 | ||
d6a2ba07 | 930 | if (compat) { |
d6a2ba07 | 931 | ret = compat_table_info(private, &tmp); |
ee999d8b | 932 | xt_compat_flush_offsets(NFPROTO_ARP); |
d6a2ba07 PM |
933 | private = &tmp; |
934 | } | |
935 | #endif | |
1a8b7a67 | 936 | memset(&info, 0, sizeof(info)); |
41acd975 PM |
937 | info.valid_hooks = t->valid_hooks; |
938 | memcpy(info.hook_entry, private->hook_entry, | |
939 | sizeof(info.hook_entry)); | |
940 | memcpy(info.underflow, private->underflow, | |
941 | sizeof(info.underflow)); | |
942 | info.num_entries = private->number; | |
943 | info.size = private->size; | |
944 | strcpy(info.name, name); | |
945 | ||
946 | if (copy_to_user(user, &info, *len) != 0) | |
947 | ret = -EFAULT; | |
948 | else | |
949 | ret = 0; | |
950 | xt_table_unlock(t); | |
951 | module_put(t->me); | |
952 | } else | |
953 | ret = t ? PTR_ERR(t) : -ENOENT; | |
d6a2ba07 PM |
954 | #ifdef CONFIG_COMPAT |
955 | if (compat) | |
ee999d8b | 956 | xt_compat_unlock(NFPROTO_ARP); |
d6a2ba07 | 957 | #endif |
41acd975 PM |
958 | return ret; |
959 | } | |
960 | ||
79df341a | 961 | static int get_entries(struct net *net, struct arpt_get_entries __user *uptr, |
d5d1baa1 | 962 | const int *len) |
1da177e4 LT |
963 | { |
964 | int ret; | |
11f6dff8 | 965 | struct arpt_get_entries get; |
4abff077 | 966 | struct xt_table *t; |
1da177e4 | 967 | |
11f6dff8 PM |
968 | if (*len < sizeof(get)) { |
969 | duprintf("get_entries: %u < %Zu\n", *len, sizeof(get)); | |
970 | return -EINVAL; | |
971 | } | |
972 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
973 | return -EFAULT; | |
974 | if (*len != sizeof(struct arpt_get_entries) + get.size) { | |
975 | duprintf("get_entries: %u != %Zu\n", *len, | |
976 | sizeof(struct arpt_get_entries) + get.size); | |
977 | return -EINVAL; | |
978 | } | |
979 | ||
ee999d8b | 980 | t = xt_find_table_lock(net, NFPROTO_ARP, get.name); |
0cc8d8df | 981 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 JE |
982 | const struct xt_table_info *private = t->private; |
983 | ||
1da177e4 | 984 | duprintf("t->private->number = %u\n", |
2e4e6a17 | 985 | private->number); |
11f6dff8 | 986 | if (get.size == private->size) |
2e4e6a17 | 987 | ret = copy_entries_to_user(private->size, |
1da177e4 LT |
988 | t, uptr->entrytable); |
989 | else { | |
990 | duprintf("get_entries: I've got %u not %u!\n", | |
11f6dff8 | 991 | private->size, get.size); |
544473c1 | 992 | ret = -EAGAIN; |
1da177e4 | 993 | } |
6b7d31fc | 994 | module_put(t->me); |
2e4e6a17 | 995 | xt_table_unlock(t); |
1da177e4 | 996 | } else |
6b7d31fc | 997 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 LT |
998 | |
999 | return ret; | |
1000 | } | |
1001 | ||
79df341a AD |
1002 | static int __do_replace(struct net *net, const char *name, |
1003 | unsigned int valid_hooks, | |
d6a2ba07 PM |
1004 | struct xt_table_info *newinfo, |
1005 | unsigned int num_counters, | |
1006 | void __user *counters_ptr) | |
1da177e4 LT |
1007 | { |
1008 | int ret; | |
4abff077 | 1009 | struct xt_table *t; |
d6a2ba07 | 1010 | struct xt_table_info *oldinfo; |
2e4e6a17 | 1011 | struct xt_counters *counters; |
d6a2ba07 | 1012 | void *loc_cpu_old_entry; |
72b2b1dd | 1013 | struct arpt_entry *iter; |
1da177e4 | 1014 | |
d6a2ba07 | 1015 | ret = 0; |
83723d60 | 1016 | counters = vzalloc(num_counters * sizeof(struct xt_counters)); |
1da177e4 LT |
1017 | if (!counters) { |
1018 | ret = -ENOMEM; | |
d6a2ba07 | 1019 | goto out; |
1da177e4 | 1020 | } |
1da177e4 | 1021 | |
ee999d8b | 1022 | t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name), |
d6a2ba07 | 1023 | "arptable_%s", name); |
0cc8d8df | 1024 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1025 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1026 | goto free_newinfo_counters_untrans; |
6b7d31fc | 1027 | } |
1da177e4 LT |
1028 | |
1029 | /* You lied! */ | |
d6a2ba07 | 1030 | if (valid_hooks != t->valid_hooks) { |
1da177e4 | 1031 | duprintf("Valid hook crap: %08X vs %08X\n", |
d6a2ba07 | 1032 | valid_hooks, t->valid_hooks); |
1da177e4 | 1033 | ret = -EINVAL; |
6b7d31fc | 1034 | goto put_module; |
1da177e4 LT |
1035 | } |
1036 | ||
d6a2ba07 | 1037 | oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); |
1da177e4 LT |
1038 | if (!oldinfo) |
1039 | goto put_module; | |
1040 | ||
1041 | /* Update module usage count based on number of rules */ | |
1042 | duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", | |
1043 | oldinfo->number, oldinfo->initial_entries, newinfo->number); | |
e905a9ed YH |
1044 | if ((oldinfo->number > oldinfo->initial_entries) || |
1045 | (newinfo->number <= oldinfo->initial_entries)) | |
1da177e4 LT |
1046 | module_put(t->me); |
1047 | if ((oldinfo->number > oldinfo->initial_entries) && | |
1048 | (newinfo->number <= oldinfo->initial_entries)) | |
1049 | module_put(t->me); | |
1050 | ||
942e4a2b | 1051 | /* Get the old counters, and synchronize with replace */ |
1da177e4 | 1052 | get_counters(oldinfo, counters); |
942e4a2b | 1053 | |
1da177e4 | 1054 | /* Decrease module usage counts and free resource */ |
482cfc31 | 1055 | loc_cpu_old_entry = oldinfo->entries; |
72b2b1dd | 1056 | xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size) |
0559518b | 1057 | cleanup_entry(iter); |
31836064 | 1058 | |
2e4e6a17 | 1059 | xt_free_table_info(oldinfo); |
d6a2ba07 | 1060 | if (copy_to_user(counters_ptr, counters, |
c58dd2dd TG |
1061 | sizeof(struct xt_counters) * num_counters) != 0) { |
1062 | /* Silent error, can't fail, new table is already in place */ | |
1063 | net_warn_ratelimited("arptables: counters copy to user failed while replacing table\n"); | |
1064 | } | |
1da177e4 | 1065 | vfree(counters); |
2e4e6a17 | 1066 | xt_table_unlock(t); |
1da177e4 LT |
1067 | return ret; |
1068 | ||
1069 | put_module: | |
1070 | module_put(t->me); | |
2e4e6a17 | 1071 | xt_table_unlock(t); |
1da177e4 | 1072 | free_newinfo_counters_untrans: |
1da177e4 | 1073 | vfree(counters); |
d6a2ba07 PM |
1074 | out: |
1075 | return ret; | |
1076 | } | |
1077 | ||
d5d1baa1 JE |
1078 | static int do_replace(struct net *net, const void __user *user, |
1079 | unsigned int len) | |
d6a2ba07 PM |
1080 | { |
1081 | int ret; | |
1082 | struct arpt_replace tmp; | |
1083 | struct xt_table_info *newinfo; | |
1084 | void *loc_cpu_entry; | |
72b2b1dd | 1085 | struct arpt_entry *iter; |
d6a2ba07 PM |
1086 | |
1087 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1088 | return -EFAULT; | |
1089 | ||
1090 | /* overflow check */ | |
1091 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1092 | return -ENOMEM; | |
1086bbe9 DJ |
1093 | if (tmp.num_counters == 0) |
1094 | return -EINVAL; | |
1095 | ||
42eab94f | 1096 | tmp.name[sizeof(tmp.name)-1] = 0; |
d6a2ba07 PM |
1097 | |
1098 | newinfo = xt_alloc_table_info(tmp.size); | |
1099 | if (!newinfo) | |
1100 | return -ENOMEM; | |
1101 | ||
482cfc31 | 1102 | loc_cpu_entry = newinfo->entries; |
d6a2ba07 PM |
1103 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), |
1104 | tmp.size) != 0) { | |
1105 | ret = -EFAULT; | |
1106 | goto free_newinfo; | |
1107 | } | |
1108 | ||
0f234214 | 1109 | ret = translate_table(newinfo, loc_cpu_entry, &tmp); |
d6a2ba07 PM |
1110 | if (ret != 0) |
1111 | goto free_newinfo; | |
1112 | ||
1113 | duprintf("arp_tables: Translated table\n"); | |
1114 | ||
79df341a | 1115 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
d6a2ba07 PM |
1116 | tmp.num_counters, tmp.counters); |
1117 | if (ret) | |
1118 | goto free_newinfo_untrans; | |
1119 | return 0; | |
1120 | ||
1121 | free_newinfo_untrans: | |
72b2b1dd | 1122 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1123 | cleanup_entry(iter); |
1da177e4 | 1124 | free_newinfo: |
2e4e6a17 | 1125 | xt_free_table_info(newinfo); |
1da177e4 LT |
1126 | return ret; |
1127 | } | |
1128 | ||
d5d1baa1 JE |
1129 | static int do_add_counters(struct net *net, const void __user *user, |
1130 | unsigned int len, int compat) | |
1da177e4 | 1131 | { |
482cfc31 | 1132 | unsigned int i; |
d6a2ba07 PM |
1133 | struct xt_counters_info tmp; |
1134 | struct xt_counters *paddc; | |
1135 | unsigned int num_counters; | |
5452e425 | 1136 | const char *name; |
d6a2ba07 PM |
1137 | int size; |
1138 | void *ptmp; | |
4abff077 | 1139 | struct xt_table *t; |
5452e425 | 1140 | const struct xt_table_info *private; |
6b7d31fc | 1141 | int ret = 0; |
72b2b1dd | 1142 | struct arpt_entry *iter; |
7f5c6d4f | 1143 | unsigned int addend; |
d6a2ba07 PM |
1144 | #ifdef CONFIG_COMPAT |
1145 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1146 | |
d6a2ba07 PM |
1147 | if (compat) { |
1148 | ptmp = &compat_tmp; | |
1149 | size = sizeof(struct compat_xt_counters_info); | |
1150 | } else | |
1151 | #endif | |
1152 | { | |
1153 | ptmp = &tmp; | |
1154 | size = sizeof(struct xt_counters_info); | |
1155 | } | |
1156 | ||
1157 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1158 | return -EFAULT; |
1159 | ||
d6a2ba07 PM |
1160 | #ifdef CONFIG_COMPAT |
1161 | if (compat) { | |
1162 | num_counters = compat_tmp.num_counters; | |
1163 | name = compat_tmp.name; | |
1164 | } else | |
1165 | #endif | |
1166 | { | |
1167 | num_counters = tmp.num_counters; | |
1168 | name = tmp.name; | |
1169 | } | |
1170 | ||
1171 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1172 | return -EINVAL; |
1173 | ||
e12f8e29 | 1174 | paddc = vmalloc(len - size); |
1da177e4 LT |
1175 | if (!paddc) |
1176 | return -ENOMEM; | |
1177 | ||
d6a2ba07 | 1178 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1179 | ret = -EFAULT; |
1180 | goto free; | |
1181 | } | |
1182 | ||
ee999d8b | 1183 | t = xt_find_table_lock(net, NFPROTO_ARP, name); |
0cc8d8df | 1184 | if (IS_ERR_OR_NULL(t)) { |
6b7d31fc | 1185 | ret = t ? PTR_ERR(t) : -ENOENT; |
1da177e4 | 1186 | goto free; |
6b7d31fc | 1187 | } |
1da177e4 | 1188 | |
942e4a2b | 1189 | local_bh_disable(); |
2e4e6a17 | 1190 | private = t->private; |
d6a2ba07 | 1191 | if (private->number != num_counters) { |
1da177e4 LT |
1192 | ret = -EINVAL; |
1193 | goto unlock_up_free; | |
1194 | } | |
1195 | ||
1196 | i = 0; | |
482cfc31 | 1197 | |
7f5c6d4f | 1198 | addend = xt_write_recseq_begin(); |
482cfc31 | 1199 | xt_entry_foreach(iter, private->entries, private->size) { |
71ae0dff FW |
1200 | struct xt_counters *tmp; |
1201 | ||
1202 | tmp = xt_get_this_cpu_counter(&iter->counters); | |
1203 | ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt); | |
0559518b JE |
1204 | ++i; |
1205 | } | |
7f5c6d4f | 1206 | xt_write_recseq_end(addend); |
1da177e4 | 1207 | unlock_up_free: |
942e4a2b | 1208 | local_bh_enable(); |
2e4e6a17 | 1209 | xt_table_unlock(t); |
6b7d31fc | 1210 | module_put(t->me); |
1da177e4 LT |
1211 | free: |
1212 | vfree(paddc); | |
1213 | ||
1214 | return ret; | |
1215 | } | |
1216 | ||
d6a2ba07 | 1217 | #ifdef CONFIG_COMPAT |
0559518b | 1218 | static inline void compat_release_entry(struct compat_arpt_entry *e) |
d6a2ba07 | 1219 | { |
87a2e70d | 1220 | struct xt_entry_target *t; |
d6a2ba07 | 1221 | |
d6a2ba07 PM |
1222 | t = compat_arpt_get_target(e); |
1223 | module_put(t->u.kernel.target->me); | |
d6a2ba07 PM |
1224 | } |
1225 | ||
1226 | static inline int | |
1227 | check_compat_entry_size_and_hooks(struct compat_arpt_entry *e, | |
1228 | struct xt_table_info *newinfo, | |
1229 | unsigned int *size, | |
d5d1baa1 JE |
1230 | const unsigned char *base, |
1231 | const unsigned char *limit, | |
1232 | const unsigned int *hook_entries, | |
1233 | const unsigned int *underflows, | |
d6a2ba07 PM |
1234 | const char *name) |
1235 | { | |
87a2e70d | 1236 | struct xt_entry_target *t; |
d6a2ba07 PM |
1237 | struct xt_target *target; |
1238 | unsigned int entry_offset; | |
1239 | int ret, off, h; | |
1240 | ||
1241 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
3666ed1c JP |
1242 | if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0 || |
1243 | (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit) { | |
d6a2ba07 PM |
1244 | duprintf("Bad offset %p, limit = %p\n", e, limit); |
1245 | return -EINVAL; | |
1246 | } | |
1247 | ||
1248 | if (e->next_offset < sizeof(struct compat_arpt_entry) + | |
1249 | sizeof(struct compat_xt_entry_target)) { | |
1250 | duprintf("checking: element %p size %u\n", | |
1251 | e, e->next_offset); | |
1252 | return -EINVAL; | |
1253 | } | |
1254 | ||
1255 | /* For purposes of check_entry casting the compat entry is fine */ | |
1256 | ret = check_entry((struct arpt_entry *)e, name); | |
1257 | if (ret) | |
1258 | return ret; | |
1259 | ||
1260 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1261 | entry_offset = (void *)e - (void *)base; | |
1262 | ||
1263 | t = compat_arpt_get_target(e); | |
d2a7b6ba JE |
1264 | target = xt_request_find_target(NFPROTO_ARP, t->u.user.name, |
1265 | t->u.user.revision); | |
1266 | if (IS_ERR(target)) { | |
d6a2ba07 PM |
1267 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", |
1268 | t->u.user.name); | |
d2a7b6ba | 1269 | ret = PTR_ERR(target); |
d6a2ba07 PM |
1270 | goto out; |
1271 | } | |
1272 | t->u.kernel.target = target; | |
1273 | ||
1274 | off += xt_compat_target_offset(target); | |
1275 | *size += off; | |
ee999d8b | 1276 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
d6a2ba07 PM |
1277 | if (ret) |
1278 | goto release_target; | |
1279 | ||
1280 | /* Check hooks & underflows */ | |
1281 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
1282 | if ((unsigned char *)e - base == hook_entries[h]) | |
1283 | newinfo->hook_entry[h] = hook_entries[h]; | |
1284 | if ((unsigned char *)e - base == underflows[h]) | |
1285 | newinfo->underflow[h] = underflows[h]; | |
1286 | } | |
1287 | ||
1288 | /* Clear counters and comefrom */ | |
1289 | memset(&e->counters, 0, sizeof(e->counters)); | |
1290 | e->comefrom = 0; | |
d6a2ba07 PM |
1291 | return 0; |
1292 | ||
1293 | release_target: | |
1294 | module_put(t->u.kernel.target->me); | |
1295 | out: | |
1296 | return ret; | |
1297 | } | |
1298 | ||
1299 | static int | |
1300 | compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr, | |
1301 | unsigned int *size, const char *name, | |
1302 | struct xt_table_info *newinfo, unsigned char *base) | |
1303 | { | |
87a2e70d | 1304 | struct xt_entry_target *t; |
d6a2ba07 PM |
1305 | struct xt_target *target; |
1306 | struct arpt_entry *de; | |
1307 | unsigned int origsize; | |
1308 | int ret, h; | |
1309 | ||
1310 | ret = 0; | |
1311 | origsize = *size; | |
1312 | de = (struct arpt_entry *)*dstptr; | |
1313 | memcpy(de, e, sizeof(struct arpt_entry)); | |
1314 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1315 | ||
1316 | *dstptr += sizeof(struct arpt_entry); | |
1317 | *size += sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1318 | ||
1319 | de->target_offset = e->target_offset - (origsize - *size); | |
1320 | t = compat_arpt_get_target(e); | |
1321 | target = t->u.kernel.target; | |
1322 | xt_compat_target_from_user(t, dstptr, size); | |
1323 | ||
1324 | de->next_offset = e->next_offset - (origsize - *size); | |
1325 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
1326 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1327 | newinfo->hook_entry[h] -= origsize - *size; | |
1328 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1329 | newinfo->underflow[h] -= origsize - *size; | |
1330 | } | |
1331 | return ret; | |
1332 | } | |
1333 | ||
d6a2ba07 PM |
1334 | static int translate_compat_table(const char *name, |
1335 | unsigned int valid_hooks, | |
1336 | struct xt_table_info **pinfo, | |
1337 | void **pentry0, | |
1338 | unsigned int total_size, | |
1339 | unsigned int number, | |
1340 | unsigned int *hook_entries, | |
1341 | unsigned int *underflows) | |
1342 | { | |
1343 | unsigned int i, j; | |
1344 | struct xt_table_info *newinfo, *info; | |
1345 | void *pos, *entry0, *entry1; | |
72b2b1dd JE |
1346 | struct compat_arpt_entry *iter0; |
1347 | struct arpt_entry *iter1; | |
d6a2ba07 | 1348 | unsigned int size; |
72b2b1dd | 1349 | int ret = 0; |
d6a2ba07 PM |
1350 | |
1351 | info = *pinfo; | |
1352 | entry0 = *pentry0; | |
1353 | size = total_size; | |
1354 | info->number = number; | |
1355 | ||
1356 | /* Init all hooks to impossible value. */ | |
1357 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
1358 | info->hook_entry[i] = 0xFFFFFFFF; | |
1359 | info->underflow[i] = 0xFFFFFFFF; | |
1360 | } | |
1361 | ||
1362 | duprintf("translate_compat_table: size %u\n", info->size); | |
1363 | j = 0; | |
ee999d8b | 1364 | xt_compat_lock(NFPROTO_ARP); |
255d0dc3 | 1365 | xt_compat_init_offsets(NFPROTO_ARP, number); |
d6a2ba07 | 1366 | /* Walk through entries, checking offsets. */ |
72b2b1dd JE |
1367 | xt_entry_foreach(iter0, entry0, total_size) { |
1368 | ret = check_compat_entry_size_and_hooks(iter0, info, &size, | |
6b4ff2d7 JE |
1369 | entry0, |
1370 | entry0 + total_size, | |
1371 | hook_entries, | |
1372 | underflows, | |
1373 | name); | |
72b2b1dd | 1374 | if (ret != 0) |
0559518b JE |
1375 | goto out_unlock; |
1376 | ++j; | |
72b2b1dd | 1377 | } |
d6a2ba07 PM |
1378 | |
1379 | ret = -EINVAL; | |
1380 | if (j != number) { | |
1381 | duprintf("translate_compat_table: %u not %u entries\n", | |
1382 | j, number); | |
1383 | goto out_unlock; | |
1384 | } | |
1385 | ||
1386 | /* Check hooks all assigned */ | |
1387 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
1388 | /* Only hooks which are valid */ | |
1389 | if (!(valid_hooks & (1 << i))) | |
1390 | continue; | |
1391 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1392 | duprintf("Invalid hook entry %u %u\n", | |
1393 | i, hook_entries[i]); | |
1394 | goto out_unlock; | |
1395 | } | |
1396 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1397 | duprintf("Invalid underflow %u %u\n", | |
1398 | i, underflows[i]); | |
1399 | goto out_unlock; | |
1400 | } | |
1401 | } | |
1402 | ||
1403 | ret = -ENOMEM; | |
1404 | newinfo = xt_alloc_table_info(size); | |
1405 | if (!newinfo) | |
1406 | goto out_unlock; | |
1407 | ||
1408 | newinfo->number = number; | |
1409 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
1410 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1411 | newinfo->underflow[i] = info->underflow[i]; | |
1412 | } | |
482cfc31 | 1413 | entry1 = newinfo->entries; |
d6a2ba07 PM |
1414 | pos = entry1; |
1415 | size = total_size; | |
72b2b1dd | 1416 | xt_entry_foreach(iter0, entry0, total_size) { |
6b4ff2d7 JE |
1417 | ret = compat_copy_entry_from_user(iter0, &pos, &size, |
1418 | name, newinfo, entry1); | |
72b2b1dd JE |
1419 | if (ret != 0) |
1420 | break; | |
1421 | } | |
ee999d8b JE |
1422 | xt_compat_flush_offsets(NFPROTO_ARP); |
1423 | xt_compat_unlock(NFPROTO_ARP); | |
d6a2ba07 PM |
1424 | if (ret) |
1425 | goto free_newinfo; | |
1426 | ||
1427 | ret = -ELOOP; | |
1428 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1429 | goto free_newinfo; | |
1430 | ||
1431 | i = 0; | |
72b2b1dd | 1432 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
71ae0dff FW |
1433 | iter1->counters.pcnt = xt_percpu_counter_alloc(); |
1434 | if (IS_ERR_VALUE(iter1->counters.pcnt)) { | |
1435 | ret = -ENOMEM; | |
1436 | break; | |
1437 | } | |
1438 | ||
0559518b | 1439 | ret = check_target(iter1, name); |
71ae0dff FW |
1440 | if (ret != 0) { |
1441 | xt_percpu_counter_free(iter1->counters.pcnt); | |
72b2b1dd | 1442 | break; |
71ae0dff | 1443 | } |
0559518b | 1444 | ++i; |
72b2b1dd | 1445 | } |
d6a2ba07 | 1446 | if (ret) { |
72b2b1dd JE |
1447 | /* |
1448 | * The first i matches need cleanup_entry (calls ->destroy) | |
1449 | * because they had called ->check already. The other j-i | |
1450 | * entries need only release. | |
1451 | */ | |
1452 | int skip = i; | |
d6a2ba07 | 1453 | j -= i; |
72b2b1dd JE |
1454 | xt_entry_foreach(iter0, entry0, newinfo->size) { |
1455 | if (skip-- > 0) | |
1456 | continue; | |
0559518b | 1457 | if (j-- == 0) |
72b2b1dd | 1458 | break; |
0559518b | 1459 | compat_release_entry(iter0); |
72b2b1dd | 1460 | } |
0559518b JE |
1461 | xt_entry_foreach(iter1, entry1, newinfo->size) { |
1462 | if (i-- == 0) | |
72b2b1dd | 1463 | break; |
0559518b JE |
1464 | cleanup_entry(iter1); |
1465 | } | |
d6a2ba07 PM |
1466 | xt_free_table_info(newinfo); |
1467 | return ret; | |
1468 | } | |
1469 | ||
d6a2ba07 PM |
1470 | *pinfo = newinfo; |
1471 | *pentry0 = entry1; | |
1472 | xt_free_table_info(info); | |
1473 | return 0; | |
1474 | ||
1475 | free_newinfo: | |
1476 | xt_free_table_info(newinfo); | |
1477 | out: | |
0559518b JE |
1478 | xt_entry_foreach(iter0, entry0, total_size) { |
1479 | if (j-- == 0) | |
72b2b1dd | 1480 | break; |
0559518b JE |
1481 | compat_release_entry(iter0); |
1482 | } | |
d6a2ba07 PM |
1483 | return ret; |
1484 | out_unlock: | |
ee999d8b JE |
1485 | xt_compat_flush_offsets(NFPROTO_ARP); |
1486 | xt_compat_unlock(NFPROTO_ARP); | |
d6a2ba07 PM |
1487 | goto out; |
1488 | } | |
1489 | ||
1490 | struct compat_arpt_replace { | |
12b00c2c | 1491 | char name[XT_TABLE_MAXNAMELEN]; |
d6a2ba07 PM |
1492 | u32 valid_hooks; |
1493 | u32 num_entries; | |
1494 | u32 size; | |
1495 | u32 hook_entry[NF_ARP_NUMHOOKS]; | |
1496 | u32 underflow[NF_ARP_NUMHOOKS]; | |
1497 | u32 num_counters; | |
1498 | compat_uptr_t counters; | |
1499 | struct compat_arpt_entry entries[0]; | |
1500 | }; | |
1501 | ||
79df341a AD |
1502 | static int compat_do_replace(struct net *net, void __user *user, |
1503 | unsigned int len) | |
d6a2ba07 PM |
1504 | { |
1505 | int ret; | |
1506 | struct compat_arpt_replace tmp; | |
1507 | struct xt_table_info *newinfo; | |
1508 | void *loc_cpu_entry; | |
72b2b1dd | 1509 | struct arpt_entry *iter; |
d6a2ba07 PM |
1510 | |
1511 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1512 | return -EFAULT; | |
1513 | ||
1514 | /* overflow check */ | |
1515 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1516 | return -ENOMEM; | |
1517 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1518 | return -ENOMEM; | |
1086bbe9 DJ |
1519 | if (tmp.num_counters == 0) |
1520 | return -EINVAL; | |
1521 | ||
42eab94f | 1522 | tmp.name[sizeof(tmp.name)-1] = 0; |
d6a2ba07 PM |
1523 | |
1524 | newinfo = xt_alloc_table_info(tmp.size); | |
1525 | if (!newinfo) | |
1526 | return -ENOMEM; | |
1527 | ||
482cfc31 | 1528 | loc_cpu_entry = newinfo->entries; |
d6a2ba07 PM |
1529 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), tmp.size) != 0) { |
1530 | ret = -EFAULT; | |
1531 | goto free_newinfo; | |
1532 | } | |
1533 | ||
1534 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, | |
1535 | &newinfo, &loc_cpu_entry, tmp.size, | |
1536 | tmp.num_entries, tmp.hook_entry, | |
1537 | tmp.underflow); | |
1538 | if (ret != 0) | |
1539 | goto free_newinfo; | |
1540 | ||
1541 | duprintf("compat_do_replace: Translated table\n"); | |
1542 | ||
79df341a | 1543 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
d6a2ba07 PM |
1544 | tmp.num_counters, compat_ptr(tmp.counters)); |
1545 | if (ret) | |
1546 | goto free_newinfo_untrans; | |
1547 | return 0; | |
1548 | ||
1549 | free_newinfo_untrans: | |
72b2b1dd | 1550 | xt_entry_foreach(iter, loc_cpu_entry, newinfo->size) |
0559518b | 1551 | cleanup_entry(iter); |
d6a2ba07 PM |
1552 | free_newinfo: |
1553 | xt_free_table_info(newinfo); | |
1554 | return ret; | |
1555 | } | |
1556 | ||
1557 | static int compat_do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1558 | unsigned int len) | |
1559 | { | |
1560 | int ret; | |
1561 | ||
52e804c6 | 1562 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
d6a2ba07 PM |
1563 | return -EPERM; |
1564 | ||
1565 | switch (cmd) { | |
1566 | case ARPT_SO_SET_REPLACE: | |
3b1e0a65 | 1567 | ret = compat_do_replace(sock_net(sk), user, len); |
d6a2ba07 PM |
1568 | break; |
1569 | ||
1570 | case ARPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1571 | ret = do_add_counters(sock_net(sk), user, len, 1); |
d6a2ba07 PM |
1572 | break; |
1573 | ||
1574 | default: | |
1575 | duprintf("do_arpt_set_ctl: unknown request %i\n", cmd); | |
1576 | ret = -EINVAL; | |
1577 | } | |
1578 | ||
1579 | return ret; | |
1580 | } | |
1581 | ||
1582 | static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr, | |
1583 | compat_uint_t *size, | |
1584 | struct xt_counters *counters, | |
0559518b | 1585 | unsigned int i) |
d6a2ba07 | 1586 | { |
87a2e70d | 1587 | struct xt_entry_target *t; |
d6a2ba07 PM |
1588 | struct compat_arpt_entry __user *ce; |
1589 | u_int16_t target_offset, next_offset; | |
1590 | compat_uint_t origsize; | |
1591 | int ret; | |
1592 | ||
d6a2ba07 PM |
1593 | origsize = *size; |
1594 | ce = (struct compat_arpt_entry __user *)*dstptr; | |
0559518b JE |
1595 | if (copy_to_user(ce, e, sizeof(struct arpt_entry)) != 0 || |
1596 | copy_to_user(&ce->counters, &counters[i], | |
1597 | sizeof(counters[i])) != 0) | |
1598 | return -EFAULT; | |
d6a2ba07 PM |
1599 | |
1600 | *dstptr += sizeof(struct compat_arpt_entry); | |
1601 | *size -= sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1602 | ||
1603 | target_offset = e->target_offset - (origsize - *size); | |
1604 | ||
1605 | t = arpt_get_target(e); | |
1606 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1607 | if (ret) | |
0559518b | 1608 | return ret; |
d6a2ba07 | 1609 | next_offset = e->next_offset - (origsize - *size); |
0559518b JE |
1610 | if (put_user(target_offset, &ce->target_offset) != 0 || |
1611 | put_user(next_offset, &ce->next_offset) != 0) | |
1612 | return -EFAULT; | |
d6a2ba07 | 1613 | return 0; |
d6a2ba07 PM |
1614 | } |
1615 | ||
1616 | static int compat_copy_entries_to_user(unsigned int total_size, | |
4abff077 | 1617 | struct xt_table *table, |
d6a2ba07 PM |
1618 | void __user *userptr) |
1619 | { | |
1620 | struct xt_counters *counters; | |
5452e425 | 1621 | const struct xt_table_info *private = table->private; |
d6a2ba07 PM |
1622 | void __user *pos; |
1623 | unsigned int size; | |
1624 | int ret = 0; | |
d6a2ba07 | 1625 | unsigned int i = 0; |
72b2b1dd | 1626 | struct arpt_entry *iter; |
d6a2ba07 PM |
1627 | |
1628 | counters = alloc_counters(table); | |
1629 | if (IS_ERR(counters)) | |
1630 | return PTR_ERR(counters); | |
1631 | ||
d6a2ba07 PM |
1632 | pos = userptr; |
1633 | size = total_size; | |
482cfc31 | 1634 | xt_entry_foreach(iter, private->entries, total_size) { |
72b2b1dd | 1635 | ret = compat_copy_entry_to_user(iter, &pos, |
6b4ff2d7 | 1636 | &size, counters, i++); |
72b2b1dd JE |
1637 | if (ret != 0) |
1638 | break; | |
1639 | } | |
d6a2ba07 PM |
1640 | vfree(counters); |
1641 | return ret; | |
1642 | } | |
1643 | ||
1644 | struct compat_arpt_get_entries { | |
12b00c2c | 1645 | char name[XT_TABLE_MAXNAMELEN]; |
d6a2ba07 PM |
1646 | compat_uint_t size; |
1647 | struct compat_arpt_entry entrytable[0]; | |
1648 | }; | |
1649 | ||
79df341a AD |
1650 | static int compat_get_entries(struct net *net, |
1651 | struct compat_arpt_get_entries __user *uptr, | |
d6a2ba07 PM |
1652 | int *len) |
1653 | { | |
1654 | int ret; | |
1655 | struct compat_arpt_get_entries get; | |
4abff077 | 1656 | struct xt_table *t; |
d6a2ba07 PM |
1657 | |
1658 | if (*len < sizeof(get)) { | |
1659 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); | |
1660 | return -EINVAL; | |
1661 | } | |
1662 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1663 | return -EFAULT; | |
1664 | if (*len != sizeof(struct compat_arpt_get_entries) + get.size) { | |
1665 | duprintf("compat_get_entries: %u != %zu\n", | |
1666 | *len, sizeof(get) + get.size); | |
1667 | return -EINVAL; | |
1668 | } | |
1669 | ||
ee999d8b JE |
1670 | xt_compat_lock(NFPROTO_ARP); |
1671 | t = xt_find_table_lock(net, NFPROTO_ARP, get.name); | |
0cc8d8df | 1672 | if (!IS_ERR_OR_NULL(t)) { |
5452e425 | 1673 | const struct xt_table_info *private = t->private; |
d6a2ba07 PM |
1674 | struct xt_table_info info; |
1675 | ||
1676 | duprintf("t->private->number = %u\n", private->number); | |
1677 | ret = compat_table_info(private, &info); | |
1678 | if (!ret && get.size == info.size) { | |
1679 | ret = compat_copy_entries_to_user(private->size, | |
1680 | t, uptr->entrytable); | |
1681 | } else if (!ret) { | |
1682 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
1683 | private->size, get.size); | |
544473c1 | 1684 | ret = -EAGAIN; |
d6a2ba07 | 1685 | } |
ee999d8b | 1686 | xt_compat_flush_offsets(NFPROTO_ARP); |
d6a2ba07 PM |
1687 | module_put(t->me); |
1688 | xt_table_unlock(t); | |
1689 | } else | |
1690 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1691 | ||
ee999d8b | 1692 | xt_compat_unlock(NFPROTO_ARP); |
d6a2ba07 PM |
1693 | return ret; |
1694 | } | |
1695 | ||
1696 | static int do_arpt_get_ctl(struct sock *, int, void __user *, int *); | |
1697 | ||
1698 | static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, | |
1699 | int *len) | |
1700 | { | |
1701 | int ret; | |
1702 | ||
52e804c6 | 1703 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
d6a2ba07 PM |
1704 | return -EPERM; |
1705 | ||
1706 | switch (cmd) { | |
1707 | case ARPT_SO_GET_INFO: | |
3b1e0a65 | 1708 | ret = get_info(sock_net(sk), user, len, 1); |
d6a2ba07 PM |
1709 | break; |
1710 | case ARPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1711 | ret = compat_get_entries(sock_net(sk), user, len); |
d6a2ba07 PM |
1712 | break; |
1713 | default: | |
1714 | ret = do_arpt_get_ctl(sk, cmd, user, len); | |
1715 | } | |
1716 | return ret; | |
1717 | } | |
1718 | #endif | |
1719 | ||
1da177e4 LT |
1720 | static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1721 | { | |
1722 | int ret; | |
1723 | ||
52e804c6 | 1724 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1725 | return -EPERM; |
1726 | ||
1727 | switch (cmd) { | |
1728 | case ARPT_SO_SET_REPLACE: | |
3b1e0a65 | 1729 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1730 | break; |
1731 | ||
1732 | case ARPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1733 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1734 | break; |
1735 | ||
1736 | default: | |
1737 | duprintf("do_arpt_set_ctl: unknown request %i\n", cmd); | |
1738 | ret = -EINVAL; | |
1739 | } | |
1740 | ||
1741 | return ret; | |
1742 | } | |
1743 | ||
1744 | static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1745 | { | |
1746 | int ret; | |
1747 | ||
52e804c6 | 1748 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1749 | return -EPERM; |
1750 | ||
1751 | switch (cmd) { | |
41acd975 | 1752 | case ARPT_SO_GET_INFO: |
3b1e0a65 | 1753 | ret = get_info(sock_net(sk), user, len, 0); |
41acd975 | 1754 | break; |
1da177e4 | 1755 | |
11f6dff8 | 1756 | case ARPT_SO_GET_ENTRIES: |
3b1e0a65 | 1757 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 1758 | break; |
1da177e4 | 1759 | |
6b7d31fc | 1760 | case ARPT_SO_GET_REVISION_TARGET: { |
2e4e6a17 | 1761 | struct xt_get_revision rev; |
6b7d31fc HW |
1762 | |
1763 | if (*len != sizeof(rev)) { | |
1764 | ret = -EINVAL; | |
1765 | break; | |
1766 | } | |
1767 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1768 | ret = -EFAULT; | |
1769 | break; | |
1770 | } | |
42eab94f | 1771 | rev.name[sizeof(rev.name)-1] = 0; |
6b7d31fc | 1772 | |
ee999d8b | 1773 | try_then_request_module(xt_find_revision(NFPROTO_ARP, rev.name, |
2e4e6a17 | 1774 | rev.revision, 1, &ret), |
6b7d31fc HW |
1775 | "arpt_%s", rev.name); |
1776 | break; | |
1777 | } | |
1778 | ||
1da177e4 LT |
1779 | default: |
1780 | duprintf("do_arpt_get_ctl: unknown request %i\n", cmd); | |
1781 | ret = -EINVAL; | |
1782 | } | |
1783 | ||
1784 | return ret; | |
1785 | } | |
1786 | ||
35aad0ff JE |
1787 | struct xt_table *arpt_register_table(struct net *net, |
1788 | const struct xt_table *table, | |
4abff077 | 1789 | const struct arpt_replace *repl) |
1da177e4 LT |
1790 | { |
1791 | int ret; | |
2e4e6a17 | 1792 | struct xt_table_info *newinfo; |
f3c5c1bf | 1793 | struct xt_table_info bootstrap = {0}; |
31836064 | 1794 | void *loc_cpu_entry; |
a98da11d | 1795 | struct xt_table *new_table; |
1da177e4 | 1796 | |
2e4e6a17 | 1797 | newinfo = xt_alloc_table_info(repl->size); |
1da177e4 LT |
1798 | if (!newinfo) { |
1799 | ret = -ENOMEM; | |
44d34e72 | 1800 | goto out; |
1da177e4 | 1801 | } |
31836064 | 1802 | |
482cfc31 | 1803 | loc_cpu_entry = newinfo->entries; |
31836064 | 1804 | memcpy(loc_cpu_entry, repl->entries, repl->size); |
1da177e4 | 1805 | |
0f234214 | 1806 | ret = translate_table(newinfo, loc_cpu_entry, repl); |
1da177e4 | 1807 | duprintf("arpt_register_table: translate table gives %d\n", ret); |
44d34e72 AD |
1808 | if (ret != 0) |
1809 | goto out_free; | |
1da177e4 | 1810 | |
79df341a | 1811 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1812 | if (IS_ERR(new_table)) { |
44d34e72 AD |
1813 | ret = PTR_ERR(new_table); |
1814 | goto out_free; | |
1da177e4 | 1815 | } |
44d34e72 | 1816 | return new_table; |
1da177e4 | 1817 | |
44d34e72 AD |
1818 | out_free: |
1819 | xt_free_table_info(newinfo); | |
1820 | out: | |
1821 | return ERR_PTR(ret); | |
1da177e4 LT |
1822 | } |
1823 | ||
4abff077 | 1824 | void arpt_unregister_table(struct xt_table *table) |
1da177e4 | 1825 | { |
2e4e6a17 | 1826 | struct xt_table_info *private; |
31836064 | 1827 | void *loc_cpu_entry; |
df200969 | 1828 | struct module *table_owner = table->me; |
72b2b1dd | 1829 | struct arpt_entry *iter; |
31836064 | 1830 | |
2e4e6a17 | 1831 | private = xt_unregister_table(table); |
1da177e4 LT |
1832 | |
1833 | /* Decrease module usage counts and free resources */ | |
482cfc31 | 1834 | loc_cpu_entry = private->entries; |
72b2b1dd | 1835 | xt_entry_foreach(iter, loc_cpu_entry, private->size) |
0559518b | 1836 | cleanup_entry(iter); |
df200969 AD |
1837 | if (private->number > private->initial_entries) |
1838 | module_put(table_owner); | |
2e4e6a17 | 1839 | xt_free_table_info(private); |
1da177e4 LT |
1840 | } |
1841 | ||
1842 | /* The built-in targets: standard (NULL) and error. */ | |
4538506b JE |
1843 | static struct xt_target arpt_builtin_tg[] __read_mostly = { |
1844 | { | |
243bf6e2 | 1845 | .name = XT_STANDARD_TARGET, |
4538506b JE |
1846 | .targetsize = sizeof(int), |
1847 | .family = NFPROTO_ARP, | |
d6a2ba07 | 1848 | #ifdef CONFIG_COMPAT |
4538506b JE |
1849 | .compatsize = sizeof(compat_int_t), |
1850 | .compat_from_user = compat_standard_from_user, | |
1851 | .compat_to_user = compat_standard_to_user, | |
d6a2ba07 | 1852 | #endif |
4538506b JE |
1853 | }, |
1854 | { | |
243bf6e2 | 1855 | .name = XT_ERROR_TARGET, |
4538506b | 1856 | .target = arpt_error, |
12b00c2c | 1857 | .targetsize = XT_FUNCTION_MAXNAMELEN, |
4538506b JE |
1858 | .family = NFPROTO_ARP, |
1859 | }, | |
1da177e4 LT |
1860 | }; |
1861 | ||
1862 | static struct nf_sockopt_ops arpt_sockopts = { | |
1863 | .pf = PF_INET, | |
1864 | .set_optmin = ARPT_BASE_CTL, | |
1865 | .set_optmax = ARPT_SO_SET_MAX+1, | |
1866 | .set = do_arpt_set_ctl, | |
d6a2ba07 PM |
1867 | #ifdef CONFIG_COMPAT |
1868 | .compat_set = compat_do_arpt_set_ctl, | |
1869 | #endif | |
1da177e4 LT |
1870 | .get_optmin = ARPT_BASE_CTL, |
1871 | .get_optmax = ARPT_SO_GET_MAX+1, | |
1872 | .get = do_arpt_get_ctl, | |
d6a2ba07 PM |
1873 | #ifdef CONFIG_COMPAT |
1874 | .compat_get = compat_do_arpt_get_ctl, | |
1875 | #endif | |
16fcec35 | 1876 | .owner = THIS_MODULE, |
1da177e4 LT |
1877 | }; |
1878 | ||
3cb609d5 AD |
1879 | static int __net_init arp_tables_net_init(struct net *net) |
1880 | { | |
ee999d8b | 1881 | return xt_proto_init(net, NFPROTO_ARP); |
3cb609d5 AD |
1882 | } |
1883 | ||
1884 | static void __net_exit arp_tables_net_exit(struct net *net) | |
1885 | { | |
ee999d8b | 1886 | xt_proto_fini(net, NFPROTO_ARP); |
3cb609d5 AD |
1887 | } |
1888 | ||
1889 | static struct pernet_operations arp_tables_net_ops = { | |
1890 | .init = arp_tables_net_init, | |
1891 | .exit = arp_tables_net_exit, | |
1892 | }; | |
1893 | ||
65b4b4e8 | 1894 | static int __init arp_tables_init(void) |
1da177e4 LT |
1895 | { |
1896 | int ret; | |
1897 | ||
3cb609d5 | 1898 | ret = register_pernet_subsys(&arp_tables_net_ops); |
0eff66e6 PM |
1899 | if (ret < 0) |
1900 | goto err1; | |
2e4e6a17 | 1901 | |
25985edc | 1902 | /* No one else will be downing sem now, so we won't sleep */ |
4538506b | 1903 | ret = xt_register_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
0eff66e6 PM |
1904 | if (ret < 0) |
1905 | goto err2; | |
1da177e4 LT |
1906 | |
1907 | /* Register setsockopt */ | |
1908 | ret = nf_register_sockopt(&arpt_sockopts); | |
0eff66e6 PM |
1909 | if (ret < 0) |
1910 | goto err4; | |
1da177e4 | 1911 | |
a887c1c1 | 1912 | printk(KERN_INFO "arp_tables: (C) 2002 David S. Miller\n"); |
1da177e4 | 1913 | return 0; |
0eff66e6 PM |
1914 | |
1915 | err4: | |
4538506b | 1916 | xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
0eff66e6 | 1917 | err2: |
3cb609d5 | 1918 | unregister_pernet_subsys(&arp_tables_net_ops); |
0eff66e6 PM |
1919 | err1: |
1920 | return ret; | |
1da177e4 LT |
1921 | } |
1922 | ||
65b4b4e8 | 1923 | static void __exit arp_tables_fini(void) |
1da177e4 LT |
1924 | { |
1925 | nf_unregister_sockopt(&arpt_sockopts); | |
4538506b | 1926 | xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg)); |
3cb609d5 | 1927 | unregister_pernet_subsys(&arp_tables_net_ops); |
1da177e4 LT |
1928 | } |
1929 | ||
1930 | EXPORT_SYMBOL(arpt_register_table); | |
1931 | EXPORT_SYMBOL(arpt_unregister_table); | |
1932 | EXPORT_SYMBOL(arpt_do_table); | |
1da177e4 | 1933 | |
65b4b4e8 AM |
1934 | module_init(arp_tables_init); |
1935 | module_exit(arp_tables_fini); |