Commit | Line | Data |
---|---|---|
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) | |
9 | * | |
10 | */ | |
90e7d4ab | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/netdevice.h> | |
4fc268d2 | 15 | #include <linux/capability.h> |
1da177e4 LT |
16 | #include <linux/if_arp.h> |
17 | #include <linux/kmod.h> | |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/proc_fs.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
57b47a53 | 22 | #include <linux/mutex.h> |
d6a2ba07 PM |
23 | #include <linux/err.h> |
24 | #include <net/compat.h> | |
79df341a | 25 | #include <net/sock.h> |
d6a2ba07 | 26 | #include <asm/uaccess.h> |
1da177e4 | 27 | |
2e4e6a17 | 28 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
29 | #include <linux/netfilter_arp/arp_tables.h> |
30 | ||
31 | MODULE_LICENSE("GPL"); | |
32 | MODULE_AUTHOR("David S. Miller <davem@redhat.com>"); | |
33 | MODULE_DESCRIPTION("arptables core"); | |
34 | ||
35 | /*#define DEBUG_ARP_TABLES*/ | |
36 | /*#define DEBUG_ARP_TABLES_USER*/ | |
37 | ||
38 | #ifdef DEBUG_ARP_TABLES | |
39 | #define dprintf(format, args...) printk(format , ## args) | |
40 | #else | |
41 | #define dprintf(format, args...) | |
42 | #endif | |
43 | ||
44 | #ifdef DEBUG_ARP_TABLES_USER | |
45 | #define duprintf(format, args...) printk(format , ## args) | |
46 | #else | |
47 | #define duprintf(format, args...) | |
48 | #endif | |
49 | ||
50 | #ifdef CONFIG_NETFILTER_DEBUG | |
51 | #define ARP_NF_ASSERT(x) \ | |
52 | do { \ | |
53 | if (!(x)) \ | |
54 | printk("ARP_NF_ASSERT: %s:%s:%u\n", \ | |
0dc47877 | 55 | __func__, __FILE__, __LINE__); \ |
1da177e4 LT |
56 | } while(0) |
57 | #else | |
58 | #define ARP_NF_ASSERT(x) | |
59 | #endif | |
1da177e4 | 60 | |
1da177e4 | 61 | static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap, |
5452e425 | 62 | const char *hdr_addr, int len) |
1da177e4 LT |
63 | { |
64 | int i, ret; | |
65 | ||
66 | if (len > ARPT_DEV_ADDR_LEN_MAX) | |
67 | len = ARPT_DEV_ADDR_LEN_MAX; | |
68 | ||
69 | ret = 0; | |
70 | for (i = 0; i < len; i++) | |
71 | ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i]; | |
72 | ||
73 | return (ret != 0); | |
74 | } | |
75 | ||
ddc214c4 ED |
76 | /* |
77 | * Unfortunatly, _b and _mask are not aligned to an int (or long int) | |
78 | * Some arches dont care, unrolling the loop is a win on them. | |
35c7f6de | 79 | * For other arches, we only have a 16bit alignement. |
ddc214c4 ED |
80 | */ |
81 | static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask) | |
82 | { | |
83 | #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS | |
b8dfe498 | 84 | unsigned long ret = ifname_compare_aligned(_a, _b, _mask); |
ddc214c4 ED |
85 | #else |
86 | unsigned long ret = 0; | |
35c7f6de ED |
87 | const u16 *a = (const u16 *)_a; |
88 | const u16 *b = (const u16 *)_b; | |
89 | const u16 *mask = (const u16 *)_mask; | |
ddc214c4 ED |
90 | int i; |
91 | ||
35c7f6de ED |
92 | for (i = 0; i < IFNAMSIZ/sizeof(u16); i++) |
93 | ret |= (a[i] ^ b[i]) & mask[i]; | |
ddc214c4 ED |
94 | #endif |
95 | return ret; | |
96 | } | |
97 | ||
1da177e4 LT |
98 | /* Returns whether packet matches rule or not. */ |
99 | static inline int arp_packet_match(const struct arphdr *arphdr, | |
100 | struct net_device *dev, | |
101 | const char *indev, | |
102 | const char *outdev, | |
103 | const struct arpt_arp *arpinfo) | |
104 | { | |
5452e425 JE |
105 | const char *arpptr = (char *)(arphdr + 1); |
106 | const char *src_devaddr, *tgt_devaddr; | |
59b8bfd8 | 107 | __be32 src_ipaddr, tgt_ipaddr; |
ddc214c4 | 108 | long ret; |
1da177e4 | 109 | |
e79ec50b | 110 | #define FWINV(bool, invflg) ((bool) ^ !!(arpinfo->invflags & (invflg))) |
1da177e4 LT |
111 | |
112 | if (FWINV((arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop, | |
113 | ARPT_INV_ARPOP)) { | |
114 | dprintf("ARP operation field mismatch.\n"); | |
115 | dprintf("ar_op: %04x info->arpop: %04x info->arpop_mask: %04x\n", | |
116 | arphdr->ar_op, arpinfo->arpop, arpinfo->arpop_mask); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | if (FWINV((arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd, | |
121 | ARPT_INV_ARPHRD)) { | |
122 | dprintf("ARP hardware address format mismatch.\n"); | |
123 | dprintf("ar_hrd: %04x info->arhrd: %04x info->arhrd_mask: %04x\n", | |
124 | arphdr->ar_hrd, arpinfo->arhrd, arpinfo->arhrd_mask); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | if (FWINV((arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro, | |
129 | ARPT_INV_ARPPRO)) { | |
130 | dprintf("ARP protocol address format mismatch.\n"); | |
131 | dprintf("ar_pro: %04x info->arpro: %04x info->arpro_mask: %04x\n", | |
132 | arphdr->ar_pro, arpinfo->arpro, arpinfo->arpro_mask); | |
133 | return 0; | |
134 | } | |
135 | ||
136 | if (FWINV((arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln, | |
137 | ARPT_INV_ARPHLN)) { | |
138 | dprintf("ARP hardware address length mismatch.\n"); | |
139 | dprintf("ar_hln: %02x info->arhln: %02x info->arhln_mask: %02x\n", | |
140 | arphdr->ar_hln, arpinfo->arhln, arpinfo->arhln_mask); | |
141 | return 0; | |
142 | } | |
143 | ||
144 | src_devaddr = arpptr; | |
145 | arpptr += dev->addr_len; | |
146 | memcpy(&src_ipaddr, arpptr, sizeof(u32)); | |
147 | arpptr += sizeof(u32); | |
148 | tgt_devaddr = arpptr; | |
149 | arpptr += dev->addr_len; | |
150 | memcpy(&tgt_ipaddr, arpptr, sizeof(u32)); | |
151 | ||
152 | if (FWINV(arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, dev->addr_len), | |
153 | ARPT_INV_SRCDEVADDR) || | |
154 | FWINV(arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, dev->addr_len), | |
155 | ARPT_INV_TGTDEVADDR)) { | |
156 | dprintf("Source or target device address mismatch.\n"); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | if (FWINV((src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr, | |
162 | ARPT_INV_SRCIP) || | |
163 | FWINV(((tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr), | |
164 | ARPT_INV_TGTIP)) { | |
165 | dprintf("Source or target IP address mismatch.\n"); | |
166 | ||
cffee385 HH |
167 | dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n", |
168 | &src_ipaddr, | |
169 | &arpinfo->smsk.s_addr, | |
170 | &arpinfo->src.s_addr, | |
1da177e4 | 171 | arpinfo->invflags & ARPT_INV_SRCIP ? " (INV)" : ""); |
cffee385 HH |
172 | dprintf("TGT: %pI4 Mask: %pI4 Target: %pI4.%s\n", |
173 | &tgt_ipaddr, | |
174 | &arpinfo->tmsk.s_addr, | |
175 | &arpinfo->tgt.s_addr, | |
1da177e4 LT |
176 | arpinfo->invflags & ARPT_INV_TGTIP ? " (INV)" : ""); |
177 | return 0; | |
178 | } | |
179 | ||
180 | /* Look for ifname matches. */ | |
ddc214c4 | 181 | ret = ifname_compare(indev, arpinfo->iniface, arpinfo->iniface_mask); |
1da177e4 LT |
182 | |
183 | if (FWINV(ret != 0, ARPT_INV_VIA_IN)) { | |
184 | dprintf("VIA in mismatch (%s vs %s).%s\n", | |
185 | indev, arpinfo->iniface, | |
186 | arpinfo->invflags&ARPT_INV_VIA_IN ?" (INV)":""); | |
187 | return 0; | |
188 | } | |
189 | ||
ddc214c4 | 190 | ret = ifname_compare(outdev, arpinfo->outiface, arpinfo->outiface_mask); |
1da177e4 LT |
191 | |
192 | if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) { | |
193 | dprintf("VIA out mismatch (%s vs %s).%s\n", | |
194 | outdev, arpinfo->outiface, | |
195 | arpinfo->invflags&ARPT_INV_VIA_OUT ?" (INV)":""); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | return 1; | |
e79ec50b | 200 | #undef FWINV |
1da177e4 LT |
201 | } |
202 | ||
203 | static inline int arp_checkentry(const struct arpt_arp *arp) | |
204 | { | |
205 | if (arp->flags & ~ARPT_F_MASK) { | |
206 | duprintf("Unknown flag bits set: %08X\n", | |
207 | arp->flags & ~ARPT_F_MASK); | |
208 | return 0; | |
209 | } | |
210 | if (arp->invflags & ~ARPT_INV_MASK) { | |
211 | duprintf("Unknown invflag bits set: %08X\n", | |
212 | arp->invflags & ~ARPT_INV_MASK); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | return 1; | |
217 | } | |
218 | ||
7eb35586 JE |
219 | static unsigned int |
220 | arpt_error(struct sk_buff *skb, const struct xt_target_param *par) | |
1da177e4 LT |
221 | { |
222 | if (net_ratelimit()) | |
7eb35586 JE |
223 | printk("arp_tables: error: '%s'\n", |
224 | (const char *)par->targinfo); | |
1da177e4 LT |
225 | |
226 | return NF_DROP; | |
227 | } | |
228 | ||
229 | static inline struct arpt_entry *get_entry(void *base, unsigned int offset) | |
230 | { | |
231 | return (struct arpt_entry *)(base + offset); | |
232 | } | |
233 | ||
98e86403 JE |
234 | static inline __pure |
235 | struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry) | |
236 | { | |
237 | return (void *)entry + entry->next_offset; | |
238 | } | |
239 | ||
3db05fea | 240 | unsigned int arpt_do_table(struct sk_buff *skb, |
1da177e4 LT |
241 | unsigned int hook, |
242 | const struct net_device *in, | |
243 | const struct net_device *out, | |
4abff077 | 244 | struct xt_table *table) |
1da177e4 | 245 | { |
ddc214c4 | 246 | static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long)))); |
1da177e4 | 247 | unsigned int verdict = NF_DROP; |
5452e425 | 248 | const struct arphdr *arp; |
cff533ac | 249 | bool hotdrop = false; |
1da177e4 LT |
250 | struct arpt_entry *e, *back; |
251 | const char *indev, *outdev; | |
252 | void *table_base; | |
5452e425 | 253 | const struct xt_table_info *private; |
7eb35586 | 254 | struct xt_target_param tgpar; |
1da177e4 | 255 | |
988b7050 | 256 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
257 | return NF_DROP; |
258 | ||
259 | indev = in ? in->name : nulldevname; | |
260 | outdev = out ? out->name : nulldevname; | |
261 | ||
942e4a2b SH |
262 | xt_info_rdlock_bh(); |
263 | private = table->private; | |
264 | table_base = private->entries[smp_processor_id()]; | |
78454473 | 265 | |
2e4e6a17 HW |
266 | e = get_entry(table_base, private->hook_entry[hook]); |
267 | back = get_entry(table_base, private->underflow[hook]); | |
1da177e4 | 268 | |
7eb35586 JE |
269 | tgpar.in = in; |
270 | tgpar.out = out; | |
271 | tgpar.hooknum = hook; | |
916a917d | 272 | tgpar.family = NFPROTO_ARP; |
7eb35586 | 273 | |
3db05fea | 274 | arp = arp_hdr(skb); |
1da177e4 | 275 | do { |
a1ff4ac8 JE |
276 | struct arpt_entry_target *t; |
277 | int hdr_len; | |
278 | ||
279 | if (!arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) { | |
280 | e = arpt_next_entry(e); | |
281 | continue; | |
282 | } | |
283 | ||
284 | hdr_len = sizeof(*arp) + (2 * sizeof(struct in_addr)) + | |
285 | (2 * skb->dev->addr_len); | |
286 | ADD_COUNTER(e->counters, hdr_len, 1); | |
1da177e4 | 287 | |
a1ff4ac8 JE |
288 | t = arpt_get_target(e); |
289 | ||
290 | /* Standard target? */ | |
291 | if (!t->u.kernel.target->target) { | |
292 | int v; | |
293 | ||
294 | v = ((struct arpt_standard_target *)t)->verdict; | |
295 | if (v < 0) { | |
296 | /* Pop from stack? */ | |
297 | if (v != ARPT_RETURN) { | |
298 | verdict = (unsigned)(-v) - 1; | |
1da177e4 | 299 | break; |
a1ff4ac8 JE |
300 | } |
301 | e = back; | |
302 | back = get_entry(table_base, back->comefrom); | |
303 | continue; | |
1da177e4 | 304 | } |
a1ff4ac8 JE |
305 | if (table_base + v |
306 | != arpt_next_entry(e)) { | |
307 | /* Save old back ptr in next entry */ | |
308 | struct arpt_entry *next = arpt_next_entry(e); | |
309 | next->comefrom = (void *)back - table_base; | |
310 | ||
311 | /* set back pointer to next entry */ | |
312 | back = next; | |
313 | } | |
314 | ||
315 | e = get_entry(table_base, v); | |
7a6b1c46 | 316 | continue; |
1da177e4 | 317 | } |
7a6b1c46 JE |
318 | |
319 | /* Targets which reenter must return | |
320 | * abs. verdicts | |
321 | */ | |
322 | tgpar.target = t->u.kernel.target; | |
323 | tgpar.targinfo = t->data; | |
324 | verdict = t->u.kernel.target->target(skb, &tgpar); | |
325 | ||
326 | /* Target might have changed stuff. */ | |
327 | arp = arp_hdr(skb); | |
328 | ||
329 | if (verdict == ARPT_CONTINUE) | |
330 | e = arpt_next_entry(e); | |
331 | else | |
332 | /* Verdict */ | |
333 | break; | |
1da177e4 | 334 | } while (!hotdrop); |
942e4a2b | 335 | xt_info_rdunlock_bh(); |
1da177e4 LT |
336 | |
337 | if (hotdrop) | |
338 | return NF_DROP; | |
339 | else | |
340 | return verdict; | |
341 | } | |
342 | ||
1da177e4 | 343 | /* All zeroes == unconditional rule. */ |
47901dc2 | 344 | static inline bool unconditional(const struct arpt_arp *arp) |
1da177e4 | 345 | { |
47901dc2 | 346 | static const struct arpt_arp uncond; |
1da177e4 | 347 | |
47901dc2 | 348 | return memcmp(arp, &uncond, sizeof(uncond)) == 0; |
1da177e4 LT |
349 | } |
350 | ||
351 | /* Figures out from what hook each rule can be called: returns 0 if | |
352 | * there are loops. Puts hook bitmask in comefrom. | |
353 | */ | |
2e4e6a17 | 354 | static int mark_source_chains(struct xt_table_info *newinfo, |
31836064 | 355 | unsigned int valid_hooks, void *entry0) |
1da177e4 LT |
356 | { |
357 | unsigned int hook; | |
358 | ||
359 | /* No recursion; use packet counter to save back ptrs (reset | |
360 | * to 0 as we leave), and comefrom to save source hook bitmask. | |
361 | */ | |
362 | for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) { | |
363 | unsigned int pos = newinfo->hook_entry[hook]; | |
364 | struct arpt_entry *e | |
31836064 | 365 | = (struct arpt_entry *)(entry0 + pos); |
1da177e4 LT |
366 | |
367 | if (!(valid_hooks & (1 << hook))) | |
368 | continue; | |
369 | ||
370 | /* Set initial back pointer. */ | |
371 | e->counters.pcnt = pos; | |
372 | ||
373 | for (;;) { | |
5452e425 | 374 | const struct arpt_standard_target *t |
1da177e4 | 375 | = (void *)arpt_get_target(e); |
e1b4b9f3 | 376 | int visited = e->comefrom & (1 << hook); |
1da177e4 LT |
377 | |
378 | if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) { | |
379 | printk("arptables: loop hook %u pos %u %08X.\n", | |
380 | hook, pos, e->comefrom); | |
381 | return 0; | |
382 | } | |
383 | e->comefrom | |
384 | |= ((1 << hook) | (1 << NF_ARP_NUMHOOKS)); | |
385 | ||
386 | /* Unconditional return/END. */ | |
e1b4b9f3 | 387 | if ((e->target_offset == sizeof(struct arpt_entry) |
1da177e4 LT |
388 | && (strcmp(t->target.u.user.name, |
389 | ARPT_STANDARD_TARGET) == 0) | |
390 | && t->verdict < 0 | |
e1b4b9f3 | 391 | && unconditional(&e->arp)) || visited) { |
1da177e4 LT |
392 | unsigned int oldpos, size; |
393 | ||
1f9352ae PM |
394 | if ((strcmp(t->target.u.user.name, |
395 | ARPT_STANDARD_TARGET) == 0) && | |
396 | t->verdict < -NF_MAX_VERDICT - 1) { | |
74c9c0c1 DM |
397 | duprintf("mark_source_chains: bad " |
398 | "negative verdict (%i)\n", | |
399 | t->verdict); | |
400 | return 0; | |
401 | } | |
402 | ||
1da177e4 LT |
403 | /* Return: backtrack through the last |
404 | * big jump. | |
405 | */ | |
406 | do { | |
407 | e->comefrom ^= (1<<NF_ARP_NUMHOOKS); | |
408 | oldpos = pos; | |
409 | pos = e->counters.pcnt; | |
410 | e->counters.pcnt = 0; | |
411 | ||
412 | /* We're at the start. */ | |
413 | if (pos == oldpos) | |
414 | goto next; | |
415 | ||
416 | e = (struct arpt_entry *) | |
31836064 | 417 | (entry0 + pos); |
1da177e4 LT |
418 | } while (oldpos == pos + e->next_offset); |
419 | ||
420 | /* Move along one */ | |
421 | size = e->next_offset; | |
422 | e = (struct arpt_entry *) | |
31836064 | 423 | (entry0 + pos + size); |
1da177e4 LT |
424 | e->counters.pcnt = pos; |
425 | pos += size; | |
426 | } else { | |
427 | int newpos = t->verdict; | |
428 | ||
429 | if (strcmp(t->target.u.user.name, | |
430 | ARPT_STANDARD_TARGET) == 0 | |
431 | && newpos >= 0) { | |
74c9c0c1 DM |
432 | if (newpos > newinfo->size - |
433 | sizeof(struct arpt_entry)) { | |
434 | duprintf("mark_source_chains: " | |
435 | "bad verdict (%i)\n", | |
436 | newpos); | |
437 | return 0; | |
438 | } | |
439 | ||
1da177e4 LT |
440 | /* This a jump; chase it. */ |
441 | duprintf("Jump rule %u -> %u\n", | |
442 | pos, newpos); | |
443 | } else { | |
444 | /* ... this is a fallthru */ | |
445 | newpos = pos + e->next_offset; | |
446 | } | |
447 | e = (struct arpt_entry *) | |
31836064 | 448 | (entry0 + newpos); |
1da177e4 LT |
449 | e->counters.pcnt = pos; |
450 | pos = newpos; | |
451 | } | |
452 | } | |
453 | next: | |
454 | duprintf("Finished chain %u\n", hook); | |
455 | } | |
456 | return 1; | |
457 | } | |
458 | ||
fb5b6095 | 459 | static inline int check_entry(struct arpt_entry *e, const char *name) |
1da177e4 | 460 | { |
5452e425 | 461 | const struct arpt_entry_target *t; |
1da177e4 LT |
462 | |
463 | if (!arp_checkentry(&e->arp)) { | |
464 | duprintf("arp_tables: arp check failed %p %s.\n", e, name); | |
465 | return -EINVAL; | |
466 | } | |
467 | ||
590bdf7f DM |
468 | if (e->target_offset + sizeof(struct arpt_entry_target) > e->next_offset) |
469 | return -EINVAL; | |
470 | ||
1da177e4 | 471 | t = arpt_get_target(e); |
590bdf7f DM |
472 | if (e->target_offset + t->u.target_size > e->next_offset) |
473 | return -EINVAL; | |
474 | ||
fb5b6095 PM |
475 | return 0; |
476 | } | |
477 | ||
478 | static inline int check_target(struct arpt_entry *e, const char *name) | |
479 | { | |
af5d6dc2 | 480 | struct arpt_entry_target *t = arpt_get_target(e); |
fb5b6095 | 481 | int ret; |
af5d6dc2 JE |
482 | struct xt_tgchk_param par = { |
483 | .table = name, | |
484 | .entryinfo = e, | |
485 | .target = t->u.kernel.target, | |
486 | .targinfo = t->data, | |
487 | .hook_mask = e->comefrom, | |
916a917d | 488 | .family = NFPROTO_ARP, |
af5d6dc2 JE |
489 | }; |
490 | ||
916a917d | 491 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false); |
367c6790 | 492 | if (ret < 0) { |
fb5b6095 PM |
493 | duprintf("arp_tables: check failed for `%s'.\n", |
494 | t->u.kernel.target->name); | |
367c6790 | 495 | return ret; |
fb5b6095 | 496 | } |
367c6790 | 497 | return 0; |
fb5b6095 PM |
498 | } |
499 | ||
500 | static inline int | |
501 | find_check_entry(struct arpt_entry *e, const char *name, unsigned int size, | |
502 | unsigned int *i) | |
503 | { | |
504 | struct arpt_entry_target *t; | |
95eea855 | 505 | struct xt_target *target; |
fb5b6095 PM |
506 | int ret; |
507 | ||
508 | ret = check_entry(e, name); | |
509 | if (ret) | |
510 | return ret; | |
511 | ||
512 | t = arpt_get_target(e); | |
ee999d8b JE |
513 | target = try_then_request_module(xt_find_target(NFPROTO_ARP, |
514 | t->u.user.name, | |
2e4e6a17 | 515 | t->u.user.revision), |
6b7d31fc HW |
516 | "arpt_%s", t->u.user.name); |
517 | if (IS_ERR(target) || !target) { | |
fb5b6095 | 518 | duprintf("find_check_entry: `%s' not found\n", t->u.user.name); |
6b7d31fc | 519 | ret = target ? PTR_ERR(target) : -ENOENT; |
1da177e4 LT |
520 | goto out; |
521 | } | |
1da177e4 | 522 | t->u.kernel.target = target; |
1da177e4 | 523 | |
fb5b6095 | 524 | ret = check_target(e, name); |
3cdc7c95 PM |
525 | if (ret) |
526 | goto err; | |
527 | ||
1da177e4 LT |
528 | (*i)++; |
529 | return 0; | |
3cdc7c95 PM |
530 | err: |
531 | module_put(t->u.kernel.target->me); | |
1da177e4 LT |
532 | out: |
533 | return ret; | |
534 | } | |
535 | ||
e2fe35c1 JE |
536 | static bool check_underflow(struct arpt_entry *e) |
537 | { | |
538 | const struct arpt_entry_target *t; | |
539 | unsigned int verdict; | |
540 | ||
541 | if (!unconditional(&e->arp)) | |
542 | return false; | |
543 | t = arpt_get_target(e); | |
544 | if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0) | |
545 | return false; | |
546 | verdict = ((struct arpt_standard_target *)t)->verdict; | |
547 | verdict = -verdict - 1; | |
548 | return verdict == NF_DROP || verdict == NF_ACCEPT; | |
549 | } | |
550 | ||
1da177e4 | 551 | static inline int check_entry_size_and_hooks(struct arpt_entry *e, |
2e4e6a17 | 552 | struct xt_table_info *newinfo, |
1da177e4 LT |
553 | unsigned char *base, |
554 | unsigned char *limit, | |
555 | const unsigned int *hook_entries, | |
556 | const unsigned int *underflows, | |
a7d51738 | 557 | unsigned int valid_hooks, |
1da177e4 LT |
558 | unsigned int *i) |
559 | { | |
560 | unsigned int h; | |
561 | ||
562 | if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 | |
563 | || (unsigned char *)e + sizeof(struct arpt_entry) >= limit) { | |
564 | duprintf("Bad offset %p\n", e); | |
565 | return -EINVAL; | |
566 | } | |
567 | ||
568 | if (e->next_offset | |
569 | < sizeof(struct arpt_entry) + sizeof(struct arpt_entry_target)) { | |
570 | duprintf("checking: element %p size %u\n", | |
571 | e, e->next_offset); | |
572 | return -EINVAL; | |
573 | } | |
574 | ||
575 | /* Check hooks & underflows */ | |
576 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
a7d51738 JE |
577 | if (!(valid_hooks & (1 << h))) |
578 | continue; | |
1da177e4 LT |
579 | if ((unsigned char *)e - base == hook_entries[h]) |
580 | newinfo->hook_entry[h] = hook_entries[h]; | |
90e7d4ab | 581 | if ((unsigned char *)e - base == underflows[h]) { |
e2fe35c1 JE |
582 | if (!check_underflow(e)) { |
583 | pr_err("Underflows must be unconditional and " | |
584 | "use the STANDARD target with " | |
585 | "ACCEPT/DROP\n"); | |
90e7d4ab JE |
586 | return -EINVAL; |
587 | } | |
1da177e4 | 588 | newinfo->underflow[h] = underflows[h]; |
90e7d4ab | 589 | } |
1da177e4 LT |
590 | } |
591 | ||
1da177e4 | 592 | /* Clear counters and comefrom */ |
2e4e6a17 | 593 | e->counters = ((struct xt_counters) { 0, 0 }); |
1da177e4 LT |
594 | e->comefrom = 0; |
595 | ||
596 | (*i)++; | |
597 | return 0; | |
598 | } | |
599 | ||
600 | static inline int cleanup_entry(struct arpt_entry *e, unsigned int *i) | |
601 | { | |
a2df1648 | 602 | struct xt_tgdtor_param par; |
1da177e4 LT |
603 | struct arpt_entry_target *t; |
604 | ||
605 | if (i && (*i)-- == 0) | |
606 | return 1; | |
607 | ||
608 | t = arpt_get_target(e); | |
a2df1648 JE |
609 | par.target = t->u.kernel.target; |
610 | par.targinfo = t->data; | |
916a917d | 611 | par.family = NFPROTO_ARP; |
a2df1648 JE |
612 | if (par.target->destroy != NULL) |
613 | par.target->destroy(&par); | |
614 | module_put(par.target->me); | |
1da177e4 LT |
615 | return 0; |
616 | } | |
617 | ||
618 | /* Checks and translates the user-supplied table segment (held in | |
619 | * newinfo). | |
620 | */ | |
621 | static int translate_table(const char *name, | |
622 | unsigned int valid_hooks, | |
2e4e6a17 | 623 | struct xt_table_info *newinfo, |
31836064 | 624 | void *entry0, |
1da177e4 LT |
625 | unsigned int size, |
626 | unsigned int number, | |
627 | const unsigned int *hook_entries, | |
628 | const unsigned int *underflows) | |
629 | { | |
630 | unsigned int i; | |
631 | int ret; | |
632 | ||
633 | newinfo->size = size; | |
634 | newinfo->number = number; | |
635 | ||
636 | /* Init all hooks to impossible value. */ | |
637 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
638 | newinfo->hook_entry[i] = 0xFFFFFFFF; | |
639 | newinfo->underflow[i] = 0xFFFFFFFF; | |
640 | } | |
641 | ||
642 | duprintf("translate_table: size %u\n", newinfo->size); | |
643 | i = 0; | |
644 | ||
645 | /* Walk through entries, checking offsets. */ | |
31836064 | 646 | ret = ARPT_ENTRY_ITERATE(entry0, newinfo->size, |
1da177e4 LT |
647 | check_entry_size_and_hooks, |
648 | newinfo, | |
31836064 ED |
649 | entry0, |
650 | entry0 + size, | |
a7d51738 | 651 | hook_entries, underflows, valid_hooks, &i); |
1da177e4 LT |
652 | duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret); |
653 | if (ret != 0) | |
654 | return ret; | |
655 | ||
656 | if (i != number) { | |
657 | duprintf("translate_table: %u not %u entries\n", | |
658 | i, number); | |
659 | return -EINVAL; | |
660 | } | |
661 | ||
662 | /* Check hooks all assigned */ | |
663 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
664 | /* Only hooks which are valid */ | |
665 | if (!(valid_hooks & (1 << i))) | |
666 | continue; | |
667 | if (newinfo->hook_entry[i] == 0xFFFFFFFF) { | |
668 | duprintf("Invalid hook entry %u %u\n", | |
669 | i, hook_entries[i]); | |
670 | return -EINVAL; | |
671 | } | |
672 | if (newinfo->underflow[i] == 0xFFFFFFFF) { | |
673 | duprintf("Invalid underflow %u %u\n", | |
674 | i, underflows[i]); | |
675 | return -EINVAL; | |
676 | } | |
677 | } | |
678 | ||
74c9c0c1 DM |
679 | if (!mark_source_chains(newinfo, valid_hooks, entry0)) { |
680 | duprintf("Looping hook\n"); | |
681 | return -ELOOP; | |
682 | } | |
683 | ||
1da177e4 LT |
684 | /* Finally, each sanity check must pass */ |
685 | i = 0; | |
31836064 | 686 | ret = ARPT_ENTRY_ITERATE(entry0, newinfo->size, |
fb5b6095 | 687 | find_check_entry, name, size, &i); |
1da177e4 | 688 | |
74c9c0c1 DM |
689 | if (ret != 0) { |
690 | ARPT_ENTRY_ITERATE(entry0, newinfo->size, | |
691 | cleanup_entry, &i); | |
692 | return ret; | |
1da177e4 LT |
693 | } |
694 | ||
695 | /* And one copy for every other CPU */ | |
6f912042 | 696 | for_each_possible_cpu(i) { |
31836064 ED |
697 | if (newinfo->entries[i] && newinfo->entries[i] != entry0) |
698 | memcpy(newinfo->entries[i], entry0, newinfo->size); | |
1da177e4 LT |
699 | } |
700 | ||
701 | return ret; | |
702 | } | |
703 | ||
1da177e4 LT |
704 | /* Gets counters. */ |
705 | static inline int add_entry_to_counter(const struct arpt_entry *e, | |
2e4e6a17 | 706 | struct xt_counters total[], |
1da177e4 LT |
707 | unsigned int *i) |
708 | { | |
709 | ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
710 | ||
711 | (*i)++; | |
712 | return 0; | |
713 | } | |
714 | ||
31836064 | 715 | static inline int set_entry_to_counter(const struct arpt_entry *e, |
2e4e6a17 | 716 | struct xt_counters total[], |
31836064 ED |
717 | unsigned int *i) |
718 | { | |
719 | SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt); | |
720 | ||
721 | (*i)++; | |
722 | return 0; | |
723 | } | |
724 | ||
2e4e6a17 HW |
725 | static void get_counters(const struct xt_table_info *t, |
726 | struct xt_counters counters[]) | |
1da177e4 LT |
727 | { |
728 | unsigned int cpu; | |
729 | unsigned int i; | |
31836064 ED |
730 | unsigned int curcpu; |
731 | ||
732 | /* Instead of clearing (by a previous call to memset()) | |
733 | * the counters and using adds, we set the counters | |
734 | * with data used by 'current' CPU | |
942e4a2b SH |
735 | * |
736 | * Bottom half has to be disabled to prevent deadlock | |
737 | * if new softirq were to run and call ipt_do_table | |
31836064 | 738 | */ |
942e4a2b SH |
739 | local_bh_disable(); |
740 | curcpu = smp_processor_id(); | |
31836064 ED |
741 | |
742 | i = 0; | |
743 | ARPT_ENTRY_ITERATE(t->entries[curcpu], | |
744 | t->size, | |
745 | set_entry_to_counter, | |
746 | counters, | |
747 | &i); | |
1da177e4 | 748 | |
6f912042 | 749 | for_each_possible_cpu(cpu) { |
31836064 ED |
750 | if (cpu == curcpu) |
751 | continue; | |
1da177e4 | 752 | i = 0; |
942e4a2b | 753 | xt_info_wrlock(cpu); |
31836064 | 754 | ARPT_ENTRY_ITERATE(t->entries[cpu], |
1da177e4 LT |
755 | t->size, |
756 | add_entry_to_counter, | |
757 | counters, | |
758 | &i); | |
942e4a2b | 759 | xt_info_wrunlock(cpu); |
1da177e4 | 760 | } |
78454473 SH |
761 | local_bh_enable(); |
762 | } | |
763 | ||
78454473 | 764 | static struct xt_counters *alloc_counters(struct xt_table *table) |
1da177e4 | 765 | { |
27e2c26b | 766 | unsigned int countersize; |
2e4e6a17 | 767 | struct xt_counters *counters; |
78454473 | 768 | struct xt_table_info *private = table->private; |
1da177e4 LT |
769 | |
770 | /* We need atomic snapshot of counters: rest doesn't change | |
771 | * (other than comefrom, which userspace doesn't care | |
772 | * about). | |
773 | */ | |
2e4e6a17 HW |
774 | countersize = sizeof(struct xt_counters) * private->number; |
775 | counters = vmalloc_node(countersize, numa_node_id()); | |
1da177e4 LT |
776 | |
777 | if (counters == NULL) | |
942e4a2b | 778 | return ERR_PTR(-ENOMEM); |
78454473 | 779 | |
942e4a2b | 780 | get_counters(private, counters); |
1da177e4 | 781 | |
27e2c26b PM |
782 | return counters; |
783 | } | |
784 | ||
785 | static int copy_entries_to_user(unsigned int total_size, | |
4abff077 | 786 | struct xt_table *table, |
27e2c26b PM |
787 | void __user *userptr) |
788 | { | |
789 | unsigned int off, num; | |
790 | struct arpt_entry *e; | |
791 | struct xt_counters *counters; | |
4abff077 | 792 | struct xt_table_info *private = table->private; |
27e2c26b PM |
793 | int ret = 0; |
794 | void *loc_cpu_entry; | |
795 | ||
796 | counters = alloc_counters(table); | |
797 | if (IS_ERR(counters)) | |
798 | return PTR_ERR(counters); | |
799 | ||
2e4e6a17 | 800 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
31836064 ED |
801 | /* ... then copy entire thing ... */ |
802 | if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) { | |
1da177e4 LT |
803 | ret = -EFAULT; |
804 | goto free_counters; | |
805 | } | |
806 | ||
807 | /* FIXME: use iterator macros --RR */ | |
808 | /* ... then go back and fix counters and names */ | |
809 | for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){ | |
810 | struct arpt_entry_target *t; | |
811 | ||
31836064 | 812 | e = (struct arpt_entry *)(loc_cpu_entry + off); |
1da177e4 LT |
813 | if (copy_to_user(userptr + off |
814 | + offsetof(struct arpt_entry, counters), | |
815 | &counters[num], | |
816 | sizeof(counters[num])) != 0) { | |
817 | ret = -EFAULT; | |
818 | goto free_counters; | |
819 | } | |
820 | ||
821 | t = arpt_get_target(e); | |
822 | if (copy_to_user(userptr + off + e->target_offset | |
823 | + offsetof(struct arpt_entry_target, | |
824 | u.user.name), | |
825 | t->u.kernel.target->name, | |
826 | strlen(t->u.kernel.target->name)+1) != 0) { | |
827 | ret = -EFAULT; | |
828 | goto free_counters; | |
829 | } | |
830 | } | |
831 | ||
832 | free_counters: | |
833 | vfree(counters); | |
834 | return ret; | |
835 | } | |
836 | ||
d6a2ba07 PM |
837 | #ifdef CONFIG_COMPAT |
838 | static void compat_standard_from_user(void *dst, void *src) | |
839 | { | |
840 | int v = *(compat_int_t *)src; | |
841 | ||
842 | if (v > 0) | |
ee999d8b | 843 | v += xt_compat_calc_jump(NFPROTO_ARP, v); |
d6a2ba07 PM |
844 | memcpy(dst, &v, sizeof(v)); |
845 | } | |
846 | ||
847 | static int compat_standard_to_user(void __user *dst, void *src) | |
848 | { | |
849 | compat_int_t cv = *(int *)src; | |
850 | ||
851 | if (cv > 0) | |
ee999d8b | 852 | cv -= xt_compat_calc_jump(NFPROTO_ARP, cv); |
d6a2ba07 PM |
853 | return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0; |
854 | } | |
855 | ||
856 | static int compat_calc_entry(struct arpt_entry *e, | |
857 | const struct xt_table_info *info, | |
858 | void *base, struct xt_table_info *newinfo) | |
859 | { | |
860 | struct arpt_entry_target *t; | |
861 | unsigned int entry_offset; | |
862 | int off, i, ret; | |
863 | ||
864 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
865 | entry_offset = (void *)e - base; | |
866 | ||
867 | t = arpt_get_target(e); | |
868 | off += xt_compat_target_offset(t->u.kernel.target); | |
869 | newinfo->size -= off; | |
ee999d8b | 870 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
d6a2ba07 PM |
871 | if (ret) |
872 | return ret; | |
873 | ||
874 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
875 | if (info->hook_entry[i] && | |
876 | (e < (struct arpt_entry *)(base + info->hook_entry[i]))) | |
877 | newinfo->hook_entry[i] -= off; | |
878 | if (info->underflow[i] && | |
879 | (e < (struct arpt_entry *)(base + info->underflow[i]))) | |
880 | newinfo->underflow[i] -= off; | |
881 | } | |
882 | return 0; | |
883 | } | |
884 | ||
885 | static int compat_table_info(const struct xt_table_info *info, | |
886 | struct xt_table_info *newinfo) | |
887 | { | |
888 | void *loc_cpu_entry; | |
889 | ||
890 | if (!newinfo || !info) | |
891 | return -EINVAL; | |
892 | ||
893 | /* we dont care about newinfo->entries[] */ | |
894 | memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); | |
895 | newinfo->initial_entries = 0; | |
896 | loc_cpu_entry = info->entries[raw_smp_processor_id()]; | |
897 | return ARPT_ENTRY_ITERATE(loc_cpu_entry, info->size, | |
898 | compat_calc_entry, info, loc_cpu_entry, | |
899 | newinfo); | |
900 | } | |
901 | #endif | |
902 | ||
79df341a | 903 | static int get_info(struct net *net, void __user *user, int *len, int compat) |
41acd975 PM |
904 | { |
905 | char name[ARPT_TABLE_MAXNAMELEN]; | |
4abff077 | 906 | struct xt_table *t; |
41acd975 PM |
907 | int ret; |
908 | ||
909 | if (*len != sizeof(struct arpt_getinfo)) { | |
910 | duprintf("length %u != %Zu\n", *len, | |
911 | sizeof(struct arpt_getinfo)); | |
912 | return -EINVAL; | |
913 | } | |
914 | ||
915 | if (copy_from_user(name, user, sizeof(name)) != 0) | |
916 | return -EFAULT; | |
917 | ||
918 | name[ARPT_TABLE_MAXNAMELEN-1] = '\0'; | |
d6a2ba07 PM |
919 | #ifdef CONFIG_COMPAT |
920 | if (compat) | |
ee999d8b | 921 | xt_compat_lock(NFPROTO_ARP); |
d6a2ba07 | 922 | #endif |
ee999d8b | 923 | t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name), |
41acd975 PM |
924 | "arptable_%s", name); |
925 | if (t && !IS_ERR(t)) { | |
926 | struct arpt_getinfo info; | |
5452e425 | 927 | const struct xt_table_info *private = t->private; |
41acd975 | 928 | |
d6a2ba07 PM |
929 | #ifdef CONFIG_COMPAT |
930 | if (compat) { | |
931 | struct xt_table_info tmp; | |
932 | ret = compat_table_info(private, &tmp); | |
ee999d8b | 933 | xt_compat_flush_offsets(NFPROTO_ARP); |
d6a2ba07 PM |
934 | private = &tmp; |
935 | } | |
936 | #endif | |
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 AD |
961 | static int get_entries(struct net *net, struct arpt_get_entries __user *uptr, |
962 | 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); |
31fe4d33 | 981 | if (t && !IS_ERR(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; |
1da177e4 | 1013 | |
d6a2ba07 PM |
1014 | ret = 0; |
1015 | counters = vmalloc_node(num_counters * sizeof(struct xt_counters), | |
19763120 | 1016 | numa_node_id()); |
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); |
6b7d31fc HW |
1024 | if (!t || IS_ERR(t)) { |
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 */ |
31836064 | 1055 | loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; |
d6a2ba07 PM |
1056 | ARPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry, |
1057 | NULL); | |
31836064 | 1058 | |
2e4e6a17 | 1059 | xt_free_table_info(oldinfo); |
d6a2ba07 PM |
1060 | if (copy_to_user(counters_ptr, counters, |
1061 | sizeof(struct xt_counters) * num_counters) != 0) | |
1da177e4 LT |
1062 | ret = -EFAULT; |
1063 | vfree(counters); | |
2e4e6a17 | 1064 | xt_table_unlock(t); |
1da177e4 LT |
1065 | return ret; |
1066 | ||
1067 | put_module: | |
1068 | module_put(t->me); | |
2e4e6a17 | 1069 | xt_table_unlock(t); |
1da177e4 | 1070 | free_newinfo_counters_untrans: |
1da177e4 | 1071 | vfree(counters); |
d6a2ba07 PM |
1072 | out: |
1073 | return ret; | |
1074 | } | |
1075 | ||
79df341a | 1076 | static int do_replace(struct net *net, void __user *user, unsigned int len) |
d6a2ba07 PM |
1077 | { |
1078 | int ret; | |
1079 | struct arpt_replace tmp; | |
1080 | struct xt_table_info *newinfo; | |
1081 | void *loc_cpu_entry; | |
1082 | ||
1083 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1084 | return -EFAULT; | |
1085 | ||
1086 | /* overflow check */ | |
1087 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1088 | return -ENOMEM; | |
1089 | ||
1090 | newinfo = xt_alloc_table_info(tmp.size); | |
1091 | if (!newinfo) | |
1092 | return -ENOMEM; | |
1093 | ||
1094 | /* choose the copy that is on our node/cpu */ | |
1095 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1096 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), | |
1097 | tmp.size) != 0) { | |
1098 | ret = -EFAULT; | |
1099 | goto free_newinfo; | |
1100 | } | |
1101 | ||
1102 | ret = translate_table(tmp.name, tmp.valid_hooks, | |
1103 | newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, | |
1104 | tmp.hook_entry, tmp.underflow); | |
1105 | if (ret != 0) | |
1106 | goto free_newinfo; | |
1107 | ||
1108 | duprintf("arp_tables: Translated table\n"); | |
1109 | ||
79df341a | 1110 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
d6a2ba07 PM |
1111 | tmp.num_counters, tmp.counters); |
1112 | if (ret) | |
1113 | goto free_newinfo_untrans; | |
1114 | return 0; | |
1115 | ||
1116 | free_newinfo_untrans: | |
1117 | ARPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1da177e4 | 1118 | free_newinfo: |
2e4e6a17 | 1119 | xt_free_table_info(newinfo); |
1da177e4 LT |
1120 | return ret; |
1121 | } | |
1122 | ||
942e4a2b SH |
1123 | /* We're lazy, and add to the first CPU; overflow works its fey magic |
1124 | * and everything is OK. */ | |
1125 | static int | |
1126 | add_counter_to_entry(struct arpt_entry *e, | |
1127 | const struct xt_counters addme[], | |
1128 | unsigned int *i) | |
1129 | { | |
1130 | ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt); | |
1131 | ||
1132 | (*i)++; | |
1133 | return 0; | |
1134 | } | |
1135 | ||
79df341a AD |
1136 | static int do_add_counters(struct net *net, void __user *user, unsigned int len, |
1137 | int compat) | |
1da177e4 | 1138 | { |
942e4a2b | 1139 | unsigned int i, curcpu; |
d6a2ba07 PM |
1140 | struct xt_counters_info tmp; |
1141 | struct xt_counters *paddc; | |
1142 | unsigned int num_counters; | |
5452e425 | 1143 | const char *name; |
d6a2ba07 PM |
1144 | int size; |
1145 | void *ptmp; | |
4abff077 | 1146 | struct xt_table *t; |
5452e425 | 1147 | const struct xt_table_info *private; |
6b7d31fc | 1148 | int ret = 0; |
31836064 | 1149 | void *loc_cpu_entry; |
d6a2ba07 PM |
1150 | #ifdef CONFIG_COMPAT |
1151 | struct compat_xt_counters_info compat_tmp; | |
1da177e4 | 1152 | |
d6a2ba07 PM |
1153 | if (compat) { |
1154 | ptmp = &compat_tmp; | |
1155 | size = sizeof(struct compat_xt_counters_info); | |
1156 | } else | |
1157 | #endif | |
1158 | { | |
1159 | ptmp = &tmp; | |
1160 | size = sizeof(struct xt_counters_info); | |
1161 | } | |
1162 | ||
1163 | if (copy_from_user(ptmp, user, size) != 0) | |
1da177e4 LT |
1164 | return -EFAULT; |
1165 | ||
d6a2ba07 PM |
1166 | #ifdef CONFIG_COMPAT |
1167 | if (compat) { | |
1168 | num_counters = compat_tmp.num_counters; | |
1169 | name = compat_tmp.name; | |
1170 | } else | |
1171 | #endif | |
1172 | { | |
1173 | num_counters = tmp.num_counters; | |
1174 | name = tmp.name; | |
1175 | } | |
1176 | ||
1177 | if (len != size + num_counters * sizeof(struct xt_counters)) | |
1da177e4 LT |
1178 | return -EINVAL; |
1179 | ||
d6a2ba07 | 1180 | paddc = vmalloc_node(len - size, numa_node_id()); |
1da177e4 LT |
1181 | if (!paddc) |
1182 | return -ENOMEM; | |
1183 | ||
d6a2ba07 | 1184 | if (copy_from_user(paddc, user + size, len - size) != 0) { |
1da177e4 LT |
1185 | ret = -EFAULT; |
1186 | goto free; | |
1187 | } | |
1188 | ||
ee999d8b | 1189 | t = xt_find_table_lock(net, NFPROTO_ARP, name); |
6b7d31fc HW |
1190 | if (!t || IS_ERR(t)) { |
1191 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1da177e4 | 1192 | goto free; |
6b7d31fc | 1193 | } |
1da177e4 | 1194 | |
942e4a2b | 1195 | local_bh_disable(); |
2e4e6a17 | 1196 | private = t->private; |
d6a2ba07 | 1197 | if (private->number != num_counters) { |
1da177e4 LT |
1198 | ret = -EINVAL; |
1199 | goto unlock_up_free; | |
1200 | } | |
1201 | ||
1202 | i = 0; | |
31836064 | 1203 | /* Choose the copy that is on our node */ |
942e4a2b SH |
1204 | curcpu = smp_processor_id(); |
1205 | loc_cpu_entry = private->entries[curcpu]; | |
1206 | xt_info_wrlock(curcpu); | |
31836064 | 1207 | ARPT_ENTRY_ITERATE(loc_cpu_entry, |
2e4e6a17 | 1208 | private->size, |
1da177e4 | 1209 | add_counter_to_entry, |
d6a2ba07 | 1210 | paddc, |
1da177e4 | 1211 | &i); |
942e4a2b | 1212 | xt_info_wrunlock(curcpu); |
1da177e4 | 1213 | unlock_up_free: |
942e4a2b | 1214 | local_bh_enable(); |
2e4e6a17 | 1215 | xt_table_unlock(t); |
6b7d31fc | 1216 | module_put(t->me); |
1da177e4 LT |
1217 | free: |
1218 | vfree(paddc); | |
1219 | ||
1220 | return ret; | |
1221 | } | |
1222 | ||
d6a2ba07 PM |
1223 | #ifdef CONFIG_COMPAT |
1224 | static inline int | |
1225 | compat_release_entry(struct compat_arpt_entry *e, unsigned int *i) | |
1226 | { | |
1227 | struct arpt_entry_target *t; | |
1228 | ||
1229 | if (i && (*i)-- == 0) | |
1230 | return 1; | |
1231 | ||
1232 | t = compat_arpt_get_target(e); | |
1233 | module_put(t->u.kernel.target->me); | |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | static inline int | |
1238 | check_compat_entry_size_and_hooks(struct compat_arpt_entry *e, | |
1239 | struct xt_table_info *newinfo, | |
1240 | unsigned int *size, | |
1241 | unsigned char *base, | |
1242 | unsigned char *limit, | |
1243 | unsigned int *hook_entries, | |
1244 | unsigned int *underflows, | |
1245 | unsigned int *i, | |
1246 | const char *name) | |
1247 | { | |
1248 | struct arpt_entry_target *t; | |
1249 | struct xt_target *target; | |
1250 | unsigned int entry_offset; | |
1251 | int ret, off, h; | |
1252 | ||
1253 | duprintf("check_compat_entry_size_and_hooks %p\n", e); | |
1254 | if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0 | |
1255 | || (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit) { | |
1256 | duprintf("Bad offset %p, limit = %p\n", e, limit); | |
1257 | return -EINVAL; | |
1258 | } | |
1259 | ||
1260 | if (e->next_offset < sizeof(struct compat_arpt_entry) + | |
1261 | sizeof(struct compat_xt_entry_target)) { | |
1262 | duprintf("checking: element %p size %u\n", | |
1263 | e, e->next_offset); | |
1264 | return -EINVAL; | |
1265 | } | |
1266 | ||
1267 | /* For purposes of check_entry casting the compat entry is fine */ | |
1268 | ret = check_entry((struct arpt_entry *)e, name); | |
1269 | if (ret) | |
1270 | return ret; | |
1271 | ||
1272 | off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1273 | entry_offset = (void *)e - (void *)base; | |
1274 | ||
1275 | t = compat_arpt_get_target(e); | |
ee999d8b | 1276 | target = try_then_request_module(xt_find_target(NFPROTO_ARP, |
d6a2ba07 PM |
1277 | t->u.user.name, |
1278 | t->u.user.revision), | |
1279 | "arpt_%s", t->u.user.name); | |
1280 | if (IS_ERR(target) || !target) { | |
1281 | duprintf("check_compat_entry_size_and_hooks: `%s' not found\n", | |
1282 | t->u.user.name); | |
1283 | ret = target ? PTR_ERR(target) : -ENOENT; | |
1284 | goto out; | |
1285 | } | |
1286 | t->u.kernel.target = target; | |
1287 | ||
1288 | off += xt_compat_target_offset(target); | |
1289 | *size += off; | |
ee999d8b | 1290 | ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off); |
d6a2ba07 PM |
1291 | if (ret) |
1292 | goto release_target; | |
1293 | ||
1294 | /* Check hooks & underflows */ | |
1295 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
1296 | if ((unsigned char *)e - base == hook_entries[h]) | |
1297 | newinfo->hook_entry[h] = hook_entries[h]; | |
1298 | if ((unsigned char *)e - base == underflows[h]) | |
1299 | newinfo->underflow[h] = underflows[h]; | |
1300 | } | |
1301 | ||
1302 | /* Clear counters and comefrom */ | |
1303 | memset(&e->counters, 0, sizeof(e->counters)); | |
1304 | e->comefrom = 0; | |
1305 | ||
1306 | (*i)++; | |
1307 | return 0; | |
1308 | ||
1309 | release_target: | |
1310 | module_put(t->u.kernel.target->me); | |
1311 | out: | |
1312 | return ret; | |
1313 | } | |
1314 | ||
1315 | static int | |
1316 | compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr, | |
1317 | unsigned int *size, const char *name, | |
1318 | struct xt_table_info *newinfo, unsigned char *base) | |
1319 | { | |
1320 | struct arpt_entry_target *t; | |
1321 | struct xt_target *target; | |
1322 | struct arpt_entry *de; | |
1323 | unsigned int origsize; | |
1324 | int ret, h; | |
1325 | ||
1326 | ret = 0; | |
1327 | origsize = *size; | |
1328 | de = (struct arpt_entry *)*dstptr; | |
1329 | memcpy(de, e, sizeof(struct arpt_entry)); | |
1330 | memcpy(&de->counters, &e->counters, sizeof(e->counters)); | |
1331 | ||
1332 | *dstptr += sizeof(struct arpt_entry); | |
1333 | *size += sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1334 | ||
1335 | de->target_offset = e->target_offset - (origsize - *size); | |
1336 | t = compat_arpt_get_target(e); | |
1337 | target = t->u.kernel.target; | |
1338 | xt_compat_target_from_user(t, dstptr, size); | |
1339 | ||
1340 | de->next_offset = e->next_offset - (origsize - *size); | |
1341 | for (h = 0; h < NF_ARP_NUMHOOKS; h++) { | |
1342 | if ((unsigned char *)de - base < newinfo->hook_entry[h]) | |
1343 | newinfo->hook_entry[h] -= origsize - *size; | |
1344 | if ((unsigned char *)de - base < newinfo->underflow[h]) | |
1345 | newinfo->underflow[h] -= origsize - *size; | |
1346 | } | |
1347 | return ret; | |
1348 | } | |
1349 | ||
1350 | static inline int compat_check_entry(struct arpt_entry *e, const char *name, | |
1351 | unsigned int *i) | |
1352 | { | |
1353 | int ret; | |
1354 | ||
1355 | ret = check_target(e, name); | |
1356 | if (ret) | |
1357 | return ret; | |
1358 | ||
1359 | (*i)++; | |
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | static int translate_compat_table(const char *name, | |
1364 | unsigned int valid_hooks, | |
1365 | struct xt_table_info **pinfo, | |
1366 | void **pentry0, | |
1367 | unsigned int total_size, | |
1368 | unsigned int number, | |
1369 | unsigned int *hook_entries, | |
1370 | unsigned int *underflows) | |
1371 | { | |
1372 | unsigned int i, j; | |
1373 | struct xt_table_info *newinfo, *info; | |
1374 | void *pos, *entry0, *entry1; | |
1375 | unsigned int size; | |
1376 | int ret; | |
1377 | ||
1378 | info = *pinfo; | |
1379 | entry0 = *pentry0; | |
1380 | size = total_size; | |
1381 | info->number = number; | |
1382 | ||
1383 | /* Init all hooks to impossible value. */ | |
1384 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
1385 | info->hook_entry[i] = 0xFFFFFFFF; | |
1386 | info->underflow[i] = 0xFFFFFFFF; | |
1387 | } | |
1388 | ||
1389 | duprintf("translate_compat_table: size %u\n", info->size); | |
1390 | j = 0; | |
ee999d8b | 1391 | xt_compat_lock(NFPROTO_ARP); |
d6a2ba07 PM |
1392 | /* Walk through entries, checking offsets. */ |
1393 | ret = COMPAT_ARPT_ENTRY_ITERATE(entry0, total_size, | |
1394 | check_compat_entry_size_and_hooks, | |
1395 | info, &size, entry0, | |
1396 | entry0 + total_size, | |
1397 | hook_entries, underflows, &j, name); | |
1398 | if (ret != 0) | |
1399 | goto out_unlock; | |
1400 | ||
1401 | ret = -EINVAL; | |
1402 | if (j != number) { | |
1403 | duprintf("translate_compat_table: %u not %u entries\n", | |
1404 | j, number); | |
1405 | goto out_unlock; | |
1406 | } | |
1407 | ||
1408 | /* Check hooks all assigned */ | |
1409 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
1410 | /* Only hooks which are valid */ | |
1411 | if (!(valid_hooks & (1 << i))) | |
1412 | continue; | |
1413 | if (info->hook_entry[i] == 0xFFFFFFFF) { | |
1414 | duprintf("Invalid hook entry %u %u\n", | |
1415 | i, hook_entries[i]); | |
1416 | goto out_unlock; | |
1417 | } | |
1418 | if (info->underflow[i] == 0xFFFFFFFF) { | |
1419 | duprintf("Invalid underflow %u %u\n", | |
1420 | i, underflows[i]); | |
1421 | goto out_unlock; | |
1422 | } | |
1423 | } | |
1424 | ||
1425 | ret = -ENOMEM; | |
1426 | newinfo = xt_alloc_table_info(size); | |
1427 | if (!newinfo) | |
1428 | goto out_unlock; | |
1429 | ||
1430 | newinfo->number = number; | |
1431 | for (i = 0; i < NF_ARP_NUMHOOKS; i++) { | |
1432 | newinfo->hook_entry[i] = info->hook_entry[i]; | |
1433 | newinfo->underflow[i] = info->underflow[i]; | |
1434 | } | |
1435 | entry1 = newinfo->entries[raw_smp_processor_id()]; | |
1436 | pos = entry1; | |
1437 | size = total_size; | |
1438 | ret = COMPAT_ARPT_ENTRY_ITERATE(entry0, total_size, | |
1439 | compat_copy_entry_from_user, | |
1440 | &pos, &size, name, newinfo, entry1); | |
ee999d8b JE |
1441 | xt_compat_flush_offsets(NFPROTO_ARP); |
1442 | xt_compat_unlock(NFPROTO_ARP); | |
d6a2ba07 PM |
1443 | if (ret) |
1444 | goto free_newinfo; | |
1445 | ||
1446 | ret = -ELOOP; | |
1447 | if (!mark_source_chains(newinfo, valid_hooks, entry1)) | |
1448 | goto free_newinfo; | |
1449 | ||
1450 | i = 0; | |
1451 | ret = ARPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry, | |
1452 | name, &i); | |
1453 | if (ret) { | |
1454 | j -= i; | |
1455 | COMPAT_ARPT_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i, | |
1456 | compat_release_entry, &j); | |
1457 | ARPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i); | |
1458 | xt_free_table_info(newinfo); | |
1459 | return ret; | |
1460 | } | |
1461 | ||
1462 | /* And one copy for every other CPU */ | |
1463 | for_each_possible_cpu(i) | |
1464 | if (newinfo->entries[i] && newinfo->entries[i] != entry1) | |
1465 | memcpy(newinfo->entries[i], entry1, newinfo->size); | |
1466 | ||
1467 | *pinfo = newinfo; | |
1468 | *pentry0 = entry1; | |
1469 | xt_free_table_info(info); | |
1470 | return 0; | |
1471 | ||
1472 | free_newinfo: | |
1473 | xt_free_table_info(newinfo); | |
1474 | out: | |
1475 | COMPAT_ARPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j); | |
1476 | return ret; | |
1477 | out_unlock: | |
ee999d8b JE |
1478 | xt_compat_flush_offsets(NFPROTO_ARP); |
1479 | xt_compat_unlock(NFPROTO_ARP); | |
d6a2ba07 PM |
1480 | goto out; |
1481 | } | |
1482 | ||
1483 | struct compat_arpt_replace { | |
1484 | char name[ARPT_TABLE_MAXNAMELEN]; | |
1485 | u32 valid_hooks; | |
1486 | u32 num_entries; | |
1487 | u32 size; | |
1488 | u32 hook_entry[NF_ARP_NUMHOOKS]; | |
1489 | u32 underflow[NF_ARP_NUMHOOKS]; | |
1490 | u32 num_counters; | |
1491 | compat_uptr_t counters; | |
1492 | struct compat_arpt_entry entries[0]; | |
1493 | }; | |
1494 | ||
79df341a AD |
1495 | static int compat_do_replace(struct net *net, void __user *user, |
1496 | unsigned int len) | |
d6a2ba07 PM |
1497 | { |
1498 | int ret; | |
1499 | struct compat_arpt_replace tmp; | |
1500 | struct xt_table_info *newinfo; | |
1501 | void *loc_cpu_entry; | |
1502 | ||
1503 | if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) | |
1504 | return -EFAULT; | |
1505 | ||
1506 | /* overflow check */ | |
1507 | if (tmp.size >= INT_MAX / num_possible_cpus()) | |
1508 | return -ENOMEM; | |
1509 | if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) | |
1510 | return -ENOMEM; | |
1511 | ||
1512 | newinfo = xt_alloc_table_info(tmp.size); | |
1513 | if (!newinfo) | |
1514 | return -ENOMEM; | |
1515 | ||
1516 | /* choose the copy that is on our node/cpu */ | |
1517 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1518 | if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), tmp.size) != 0) { | |
1519 | ret = -EFAULT; | |
1520 | goto free_newinfo; | |
1521 | } | |
1522 | ||
1523 | ret = translate_compat_table(tmp.name, tmp.valid_hooks, | |
1524 | &newinfo, &loc_cpu_entry, tmp.size, | |
1525 | tmp.num_entries, tmp.hook_entry, | |
1526 | tmp.underflow); | |
1527 | if (ret != 0) | |
1528 | goto free_newinfo; | |
1529 | ||
1530 | duprintf("compat_do_replace: Translated table\n"); | |
1531 | ||
79df341a | 1532 | ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo, |
d6a2ba07 PM |
1533 | tmp.num_counters, compat_ptr(tmp.counters)); |
1534 | if (ret) | |
1535 | goto free_newinfo_untrans; | |
1536 | return 0; | |
1537 | ||
1538 | free_newinfo_untrans: | |
1539 | ARPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL); | |
1540 | free_newinfo: | |
1541 | xt_free_table_info(newinfo); | |
1542 | return ret; | |
1543 | } | |
1544 | ||
1545 | static int compat_do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, | |
1546 | unsigned int len) | |
1547 | { | |
1548 | int ret; | |
1549 | ||
1550 | if (!capable(CAP_NET_ADMIN)) | |
1551 | return -EPERM; | |
1552 | ||
1553 | switch (cmd) { | |
1554 | case ARPT_SO_SET_REPLACE: | |
3b1e0a65 | 1555 | ret = compat_do_replace(sock_net(sk), user, len); |
d6a2ba07 PM |
1556 | break; |
1557 | ||
1558 | case ARPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1559 | ret = do_add_counters(sock_net(sk), user, len, 1); |
d6a2ba07 PM |
1560 | break; |
1561 | ||
1562 | default: | |
1563 | duprintf("do_arpt_set_ctl: unknown request %i\n", cmd); | |
1564 | ret = -EINVAL; | |
1565 | } | |
1566 | ||
1567 | return ret; | |
1568 | } | |
1569 | ||
1570 | static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr, | |
1571 | compat_uint_t *size, | |
1572 | struct xt_counters *counters, | |
1573 | unsigned int *i) | |
1574 | { | |
1575 | struct arpt_entry_target *t; | |
1576 | struct compat_arpt_entry __user *ce; | |
1577 | u_int16_t target_offset, next_offset; | |
1578 | compat_uint_t origsize; | |
1579 | int ret; | |
1580 | ||
1581 | ret = -EFAULT; | |
1582 | origsize = *size; | |
1583 | ce = (struct compat_arpt_entry __user *)*dstptr; | |
1584 | if (copy_to_user(ce, e, sizeof(struct arpt_entry))) | |
1585 | goto out; | |
1586 | ||
1587 | if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i]))) | |
1588 | goto out; | |
1589 | ||
1590 | *dstptr += sizeof(struct compat_arpt_entry); | |
1591 | *size -= sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry); | |
1592 | ||
1593 | target_offset = e->target_offset - (origsize - *size); | |
1594 | ||
1595 | t = arpt_get_target(e); | |
1596 | ret = xt_compat_target_to_user(t, dstptr, size); | |
1597 | if (ret) | |
1598 | goto out; | |
1599 | ret = -EFAULT; | |
1600 | next_offset = e->next_offset - (origsize - *size); | |
1601 | if (put_user(target_offset, &ce->target_offset)) | |
1602 | goto out; | |
1603 | if (put_user(next_offset, &ce->next_offset)) | |
1604 | goto out; | |
1605 | ||
1606 | (*i)++; | |
1607 | return 0; | |
1608 | out: | |
1609 | return ret; | |
1610 | } | |
1611 | ||
1612 | static int compat_copy_entries_to_user(unsigned int total_size, | |
4abff077 | 1613 | struct xt_table *table, |
d6a2ba07 PM |
1614 | void __user *userptr) |
1615 | { | |
1616 | struct xt_counters *counters; | |
5452e425 | 1617 | const struct xt_table_info *private = table->private; |
d6a2ba07 PM |
1618 | void __user *pos; |
1619 | unsigned int size; | |
1620 | int ret = 0; | |
1621 | void *loc_cpu_entry; | |
1622 | unsigned int i = 0; | |
1623 | ||
1624 | counters = alloc_counters(table); | |
1625 | if (IS_ERR(counters)) | |
1626 | return PTR_ERR(counters); | |
1627 | ||
1628 | /* choose the copy on our node/cpu */ | |
1629 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; | |
1630 | pos = userptr; | |
1631 | size = total_size; | |
1632 | ret = ARPT_ENTRY_ITERATE(loc_cpu_entry, total_size, | |
1633 | compat_copy_entry_to_user, | |
1634 | &pos, &size, counters, &i); | |
1635 | vfree(counters); | |
1636 | return ret; | |
1637 | } | |
1638 | ||
1639 | struct compat_arpt_get_entries { | |
1640 | char name[ARPT_TABLE_MAXNAMELEN]; | |
1641 | compat_uint_t size; | |
1642 | struct compat_arpt_entry entrytable[0]; | |
1643 | }; | |
1644 | ||
79df341a AD |
1645 | static int compat_get_entries(struct net *net, |
1646 | struct compat_arpt_get_entries __user *uptr, | |
d6a2ba07 PM |
1647 | int *len) |
1648 | { | |
1649 | int ret; | |
1650 | struct compat_arpt_get_entries get; | |
4abff077 | 1651 | struct xt_table *t; |
d6a2ba07 PM |
1652 | |
1653 | if (*len < sizeof(get)) { | |
1654 | duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get)); | |
1655 | return -EINVAL; | |
1656 | } | |
1657 | if (copy_from_user(&get, uptr, sizeof(get)) != 0) | |
1658 | return -EFAULT; | |
1659 | if (*len != sizeof(struct compat_arpt_get_entries) + get.size) { | |
1660 | duprintf("compat_get_entries: %u != %zu\n", | |
1661 | *len, sizeof(get) + get.size); | |
1662 | return -EINVAL; | |
1663 | } | |
1664 | ||
ee999d8b JE |
1665 | xt_compat_lock(NFPROTO_ARP); |
1666 | t = xt_find_table_lock(net, NFPROTO_ARP, get.name); | |
d6a2ba07 | 1667 | if (t && !IS_ERR(t)) { |
5452e425 | 1668 | const struct xt_table_info *private = t->private; |
d6a2ba07 PM |
1669 | struct xt_table_info info; |
1670 | ||
1671 | duprintf("t->private->number = %u\n", private->number); | |
1672 | ret = compat_table_info(private, &info); | |
1673 | if (!ret && get.size == info.size) { | |
1674 | ret = compat_copy_entries_to_user(private->size, | |
1675 | t, uptr->entrytable); | |
1676 | } else if (!ret) { | |
1677 | duprintf("compat_get_entries: I've got %u not %u!\n", | |
1678 | private->size, get.size); | |
544473c1 | 1679 | ret = -EAGAIN; |
d6a2ba07 | 1680 | } |
ee999d8b | 1681 | xt_compat_flush_offsets(NFPROTO_ARP); |
d6a2ba07 PM |
1682 | module_put(t->me); |
1683 | xt_table_unlock(t); | |
1684 | } else | |
1685 | ret = t ? PTR_ERR(t) : -ENOENT; | |
1686 | ||
ee999d8b | 1687 | xt_compat_unlock(NFPROTO_ARP); |
d6a2ba07 PM |
1688 | return ret; |
1689 | } | |
1690 | ||
1691 | static int do_arpt_get_ctl(struct sock *, int, void __user *, int *); | |
1692 | ||
1693 | static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, | |
1694 | int *len) | |
1695 | { | |
1696 | int ret; | |
1697 | ||
1698 | if (!capable(CAP_NET_ADMIN)) | |
1699 | return -EPERM; | |
1700 | ||
1701 | switch (cmd) { | |
1702 | case ARPT_SO_GET_INFO: | |
3b1e0a65 | 1703 | ret = get_info(sock_net(sk), user, len, 1); |
d6a2ba07 PM |
1704 | break; |
1705 | case ARPT_SO_GET_ENTRIES: | |
3b1e0a65 | 1706 | ret = compat_get_entries(sock_net(sk), user, len); |
d6a2ba07 PM |
1707 | break; |
1708 | default: | |
1709 | ret = do_arpt_get_ctl(sk, cmd, user, len); | |
1710 | } | |
1711 | return ret; | |
1712 | } | |
1713 | #endif | |
1714 | ||
1da177e4 LT |
1715 | static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
1716 | { | |
1717 | int ret; | |
1718 | ||
1719 | if (!capable(CAP_NET_ADMIN)) | |
1720 | return -EPERM; | |
1721 | ||
1722 | switch (cmd) { | |
1723 | case ARPT_SO_SET_REPLACE: | |
3b1e0a65 | 1724 | ret = do_replace(sock_net(sk), user, len); |
1da177e4 LT |
1725 | break; |
1726 | ||
1727 | case ARPT_SO_SET_ADD_COUNTERS: | |
3b1e0a65 | 1728 | ret = do_add_counters(sock_net(sk), user, len, 0); |
1da177e4 LT |
1729 | break; |
1730 | ||
1731 | default: | |
1732 | duprintf("do_arpt_set_ctl: unknown request %i\n", cmd); | |
1733 | ret = -EINVAL; | |
1734 | } | |
1735 | ||
1736 | return ret; | |
1737 | } | |
1738 | ||
1739 | static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) | |
1740 | { | |
1741 | int ret; | |
1742 | ||
1743 | if (!capable(CAP_NET_ADMIN)) | |
1744 | return -EPERM; | |
1745 | ||
1746 | switch (cmd) { | |
41acd975 | 1747 | case ARPT_SO_GET_INFO: |
3b1e0a65 | 1748 | ret = get_info(sock_net(sk), user, len, 0); |
41acd975 | 1749 | break; |
1da177e4 | 1750 | |
11f6dff8 | 1751 | case ARPT_SO_GET_ENTRIES: |
3b1e0a65 | 1752 | ret = get_entries(sock_net(sk), user, len); |
1da177e4 | 1753 | break; |
1da177e4 | 1754 | |
6b7d31fc | 1755 | case ARPT_SO_GET_REVISION_TARGET: { |
2e4e6a17 | 1756 | struct xt_get_revision rev; |
6b7d31fc HW |
1757 | |
1758 | if (*len != sizeof(rev)) { | |
1759 | ret = -EINVAL; | |
1760 | break; | |
1761 | } | |
1762 | if (copy_from_user(&rev, user, sizeof(rev)) != 0) { | |
1763 | ret = -EFAULT; | |
1764 | break; | |
1765 | } | |
1766 | ||
ee999d8b | 1767 | try_then_request_module(xt_find_revision(NFPROTO_ARP, rev.name, |
2e4e6a17 | 1768 | rev.revision, 1, &ret), |
6b7d31fc HW |
1769 | "arpt_%s", rev.name); |
1770 | break; | |
1771 | } | |
1772 | ||
1da177e4 LT |
1773 | default: |
1774 | duprintf("do_arpt_get_ctl: unknown request %i\n", cmd); | |
1775 | ret = -EINVAL; | |
1776 | } | |
1777 | ||
1778 | return ret; | |
1779 | } | |
1780 | ||
35aad0ff JE |
1781 | struct xt_table *arpt_register_table(struct net *net, |
1782 | const struct xt_table *table, | |
4abff077 | 1783 | const struct arpt_replace *repl) |
1da177e4 LT |
1784 | { |
1785 | int ret; | |
2e4e6a17 | 1786 | struct xt_table_info *newinfo; |
259d4e41 | 1787 | struct xt_table_info bootstrap |
1da177e4 | 1788 | = { 0, 0, 0, { 0 }, { 0 }, { } }; |
31836064 | 1789 | void *loc_cpu_entry; |
a98da11d | 1790 | struct xt_table *new_table; |
1da177e4 | 1791 | |
2e4e6a17 | 1792 | newinfo = xt_alloc_table_info(repl->size); |
1da177e4 LT |
1793 | if (!newinfo) { |
1794 | ret = -ENOMEM; | |
44d34e72 | 1795 | goto out; |
1da177e4 | 1796 | } |
31836064 ED |
1797 | |
1798 | /* choose the copy on our node/cpu */ | |
1799 | loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; | |
1800 | memcpy(loc_cpu_entry, repl->entries, repl->size); | |
1da177e4 LT |
1801 | |
1802 | ret = translate_table(table->name, table->valid_hooks, | |
31836064 | 1803 | newinfo, loc_cpu_entry, repl->size, |
1da177e4 LT |
1804 | repl->num_entries, |
1805 | repl->hook_entry, | |
1806 | repl->underflow); | |
2e4e6a17 | 1807 | |
1da177e4 | 1808 | duprintf("arpt_register_table: translate table gives %d\n", ret); |
44d34e72 AD |
1809 | if (ret != 0) |
1810 | goto out_free; | |
1da177e4 | 1811 | |
79df341a | 1812 | new_table = xt_register_table(net, table, &bootstrap, newinfo); |
a98da11d | 1813 | if (IS_ERR(new_table)) { |
44d34e72 AD |
1814 | ret = PTR_ERR(new_table); |
1815 | goto out_free; | |
1da177e4 | 1816 | } |
44d34e72 | 1817 | return new_table; |
1da177e4 | 1818 | |
44d34e72 AD |
1819 | out_free: |
1820 | xt_free_table_info(newinfo); | |
1821 | out: | |
1822 | return ERR_PTR(ret); | |
1da177e4 LT |
1823 | } |
1824 | ||
4abff077 | 1825 | void arpt_unregister_table(struct xt_table *table) |
1da177e4 | 1826 | { |
2e4e6a17 | 1827 | struct xt_table_info *private; |
31836064 | 1828 | void *loc_cpu_entry; |
df200969 | 1829 | struct module *table_owner = table->me; |
31836064 | 1830 | |
2e4e6a17 | 1831 | private = xt_unregister_table(table); |
1da177e4 LT |
1832 | |
1833 | /* Decrease module usage counts and free resources */ | |
2e4e6a17 HW |
1834 | loc_cpu_entry = private->entries[raw_smp_processor_id()]; |
1835 | ARPT_ENTRY_ITERATE(loc_cpu_entry, private->size, | |
1da177e4 | 1836 | cleanup_entry, NULL); |
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. */ | |
95eea855 | 1843 | static struct xt_target arpt_standard_target __read_mostly = { |
1da177e4 | 1844 | .name = ARPT_STANDARD_TARGET, |
aa83c1ab | 1845 | .targetsize = sizeof(int), |
ee999d8b | 1846 | .family = NFPROTO_ARP, |
d6a2ba07 PM |
1847 | #ifdef CONFIG_COMPAT |
1848 | .compatsize = sizeof(compat_int_t), | |
1849 | .compat_from_user = compat_standard_from_user, | |
1850 | .compat_to_user = compat_standard_to_user, | |
1851 | #endif | |
1da177e4 LT |
1852 | }; |
1853 | ||
95eea855 | 1854 | static struct xt_target arpt_error_target __read_mostly = { |
1da177e4 LT |
1855 | .name = ARPT_ERROR_TARGET, |
1856 | .target = arpt_error, | |
aa83c1ab | 1857 | .targetsize = ARPT_FUNCTION_MAXNAMELEN, |
ee999d8b | 1858 | .family = NFPROTO_ARP, |
1da177e4 LT |
1859 | }; |
1860 | ||
1861 | static struct nf_sockopt_ops arpt_sockopts = { | |
1862 | .pf = PF_INET, | |
1863 | .set_optmin = ARPT_BASE_CTL, | |
1864 | .set_optmax = ARPT_SO_SET_MAX+1, | |
1865 | .set = do_arpt_set_ctl, | |
d6a2ba07 PM |
1866 | #ifdef CONFIG_COMPAT |
1867 | .compat_set = compat_do_arpt_set_ctl, | |
1868 | #endif | |
1da177e4 LT |
1869 | .get_optmin = ARPT_BASE_CTL, |
1870 | .get_optmax = ARPT_SO_GET_MAX+1, | |
1871 | .get = do_arpt_get_ctl, | |
d6a2ba07 PM |
1872 | #ifdef CONFIG_COMPAT |
1873 | .compat_get = compat_do_arpt_get_ctl, | |
1874 | #endif | |
16fcec35 | 1875 | .owner = THIS_MODULE, |
1da177e4 LT |
1876 | }; |
1877 | ||
3cb609d5 AD |
1878 | static int __net_init arp_tables_net_init(struct net *net) |
1879 | { | |
ee999d8b | 1880 | return xt_proto_init(net, NFPROTO_ARP); |
3cb609d5 AD |
1881 | } |
1882 | ||
1883 | static void __net_exit arp_tables_net_exit(struct net *net) | |
1884 | { | |
ee999d8b | 1885 | xt_proto_fini(net, NFPROTO_ARP); |
3cb609d5 AD |
1886 | } |
1887 | ||
1888 | static struct pernet_operations arp_tables_net_ops = { | |
1889 | .init = arp_tables_net_init, | |
1890 | .exit = arp_tables_net_exit, | |
1891 | }; | |
1892 | ||
65b4b4e8 | 1893 | static int __init arp_tables_init(void) |
1da177e4 LT |
1894 | { |
1895 | int ret; | |
1896 | ||
3cb609d5 | 1897 | ret = register_pernet_subsys(&arp_tables_net_ops); |
0eff66e6 PM |
1898 | if (ret < 0) |
1899 | goto err1; | |
2e4e6a17 | 1900 | |
1da177e4 | 1901 | /* Noone else will be downing sem now, so we won't sleep */ |
0eff66e6 PM |
1902 | ret = xt_register_target(&arpt_standard_target); |
1903 | if (ret < 0) | |
1904 | goto err2; | |
1905 | ret = xt_register_target(&arpt_error_target); | |
1906 | if (ret < 0) | |
1907 | goto err3; | |
1da177e4 LT |
1908 | |
1909 | /* Register setsockopt */ | |
1910 | ret = nf_register_sockopt(&arpt_sockopts); | |
0eff66e6 PM |
1911 | if (ret < 0) |
1912 | goto err4; | |
1da177e4 | 1913 | |
a887c1c1 | 1914 | printk(KERN_INFO "arp_tables: (C) 2002 David S. Miller\n"); |
1da177e4 | 1915 | return 0; |
0eff66e6 PM |
1916 | |
1917 | err4: | |
1918 | xt_unregister_target(&arpt_error_target); | |
1919 | err3: | |
1920 | xt_unregister_target(&arpt_standard_target); | |
1921 | err2: | |
3cb609d5 | 1922 | unregister_pernet_subsys(&arp_tables_net_ops); |
0eff66e6 PM |
1923 | err1: |
1924 | return ret; | |
1da177e4 LT |
1925 | } |
1926 | ||
65b4b4e8 | 1927 | static void __exit arp_tables_fini(void) |
1da177e4 LT |
1928 | { |
1929 | nf_unregister_sockopt(&arpt_sockopts); | |
f603b6ec PM |
1930 | xt_unregister_target(&arpt_error_target); |
1931 | xt_unregister_target(&arpt_standard_target); | |
3cb609d5 | 1932 | unregister_pernet_subsys(&arp_tables_net_ops); |
1da177e4 LT |
1933 | } |
1934 | ||
1935 | EXPORT_SYMBOL(arpt_register_table); | |
1936 | EXPORT_SYMBOL(arpt_unregister_table); | |
1937 | EXPORT_SYMBOL(arpt_do_table); | |
1da177e4 | 1938 | |
65b4b4e8 AM |
1939 | module_init(arp_tables_init); |
1940 | module_exit(arp_tables_fini); |