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Merge remote-tracking branches 'asoc/fix/adau1701' and 'asoc/fix/tlv320aic32x4' into...
[deliverable/linux.git] / net / netfilter / nft_compat.c
1 /*
2 * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/netlink.h>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter/nfnetlink.h>
17 #include <linux/netfilter/nf_tables.h>
18 #include <linux/netfilter/nf_tables_compat.h>
19 #include <linux/netfilter/x_tables.h>
20 #include <linux/netfilter_ipv4/ip_tables.h>
21 #include <linux/netfilter_ipv6/ip6_tables.h>
22 #include <asm/uaccess.h> /* for set_fs */
23 #include <net/netfilter/nf_tables.h>
24
25 union nft_entry {
26 struct ipt_entry e4;
27 struct ip6t_entry e6;
28 };
29
30 static inline void
31 nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info)
32 {
33 par->target = xt;
34 par->targinfo = xt_info;
35 par->hotdrop = false;
36 }
37
38 static void nft_target_eval(const struct nft_expr *expr,
39 struct nft_data data[NFT_REG_MAX + 1],
40 const struct nft_pktinfo *pkt)
41 {
42 void *info = nft_expr_priv(expr);
43 struct xt_target *target = expr->ops->data;
44 struct sk_buff *skb = pkt->skb;
45 int ret;
46
47 nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info);
48
49 ret = target->target(skb, &pkt->xt);
50
51 if (pkt->xt.hotdrop)
52 ret = NF_DROP;
53
54 switch(ret) {
55 case XT_CONTINUE:
56 data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
57 break;
58 default:
59 data[NFT_REG_VERDICT].verdict = ret;
60 break;
61 }
62 return;
63 }
64
65 static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = {
66 [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING },
67 [NFTA_TARGET_REV] = { .type = NLA_U32 },
68 [NFTA_TARGET_INFO] = { .type = NLA_BINARY },
69 };
70
71 static void
72 nft_target_set_tgchk_param(struct xt_tgchk_param *par,
73 const struct nft_ctx *ctx,
74 struct xt_target *target, void *info,
75 union nft_entry *entry, u8 proto, bool inv)
76 {
77 par->net = &init_net;
78 par->table = ctx->table->name;
79 switch (ctx->afi->family) {
80 case AF_INET:
81 entry->e4.ip.proto = proto;
82 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
83 break;
84 case AF_INET6:
85 entry->e6.ipv6.proto = proto;
86 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
87 break;
88 }
89 par->entryinfo = entry;
90 par->target = target;
91 par->targinfo = info;
92 if (ctx->chain->flags & NFT_BASE_CHAIN) {
93 const struct nft_base_chain *basechain =
94 nft_base_chain(ctx->chain);
95 const struct nf_hook_ops *ops = &basechain->ops;
96
97 par->hook_mask = 1 << ops->hooknum;
98 }
99 par->family = ctx->afi->family;
100 }
101
102 static void target_compat_from_user(struct xt_target *t, void *in, void *out)
103 {
104 #ifdef CONFIG_COMPAT
105 if (t->compat_from_user) {
106 int pad;
107
108 t->compat_from_user(out, in);
109 pad = XT_ALIGN(t->targetsize) - t->targetsize;
110 if (pad > 0)
111 memset(out + t->targetsize, 0, pad);
112 } else
113 #endif
114 memcpy(out, in, XT_ALIGN(t->targetsize));
115 }
116
117 static inline int nft_compat_target_offset(struct xt_target *target)
118 {
119 #ifdef CONFIG_COMPAT
120 return xt_compat_target_offset(target);
121 #else
122 return 0;
123 #endif
124 }
125
126 static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = {
127 [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 },
128 [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 },
129 };
130
131 static int nft_parse_compat(const struct nlattr *attr, u8 *proto, bool *inv)
132 {
133 struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1];
134 u32 flags;
135 int err;
136
137 err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr,
138 nft_rule_compat_policy);
139 if (err < 0)
140 return err;
141
142 if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS])
143 return -EINVAL;
144
145 flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS]));
146 if (flags & ~NFT_RULE_COMPAT_F_MASK)
147 return -EINVAL;
148 if (flags & NFT_RULE_COMPAT_F_INV)
149 *inv = true;
150
151 *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
152 return 0;
153 }
154
155 static int
156 nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
157 const struct nlattr * const tb[])
158 {
159 void *info = nft_expr_priv(expr);
160 struct xt_target *target = expr->ops->data;
161 struct xt_tgchk_param par;
162 size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO]));
163 u8 proto = 0;
164 bool inv = false;
165 union nft_entry e = {};
166 int ret;
167
168 target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info);
169
170 if (ctx->nla[NFTA_RULE_COMPAT]) {
171 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
172 if (ret < 0)
173 goto err;
174 }
175
176 nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv);
177
178 ret = xt_check_target(&par, size, proto, inv);
179 if (ret < 0)
180 goto err;
181
182 /* The standard target cannot be used */
183 if (target->target == NULL) {
184 ret = -EINVAL;
185 goto err;
186 }
187
188 return 0;
189 err:
190 module_put(target->me);
191 return ret;
192 }
193
194 static void
195 nft_target_destroy(const struct nft_expr *expr)
196 {
197 struct xt_target *target = expr->ops->data;
198
199 module_put(target->me);
200 }
201
202 static int
203 target_dump_info(struct sk_buff *skb, const struct xt_target *t, const void *in)
204 {
205 int ret;
206
207 #ifdef CONFIG_COMPAT
208 if (t->compat_to_user) {
209 mm_segment_t old_fs;
210 void *out;
211
212 out = kmalloc(XT_ALIGN(t->targetsize), GFP_ATOMIC);
213 if (out == NULL)
214 return -ENOMEM;
215
216 /* We want to reuse existing compat_to_user */
217 old_fs = get_fs();
218 set_fs(KERNEL_DS);
219 t->compat_to_user(out, in);
220 set_fs(old_fs);
221 ret = nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(t->targetsize), out);
222 kfree(out);
223 } else
224 #endif
225 ret = nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(t->targetsize), in);
226
227 return ret;
228 }
229
230 static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr)
231 {
232 const struct xt_target *target = expr->ops->data;
233 void *info = nft_expr_priv(expr);
234
235 if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) ||
236 nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) ||
237 target_dump_info(skb, target, info))
238 goto nla_put_failure;
239
240 return 0;
241
242 nla_put_failure:
243 return -1;
244 }
245
246 static int nft_target_validate(const struct nft_ctx *ctx,
247 const struct nft_expr *expr,
248 const struct nft_data **data)
249 {
250 struct xt_target *target = expr->ops->data;
251 unsigned int hook_mask = 0;
252
253 if (ctx->chain->flags & NFT_BASE_CHAIN) {
254 const struct nft_base_chain *basechain =
255 nft_base_chain(ctx->chain);
256 const struct nf_hook_ops *ops = &basechain->ops;
257
258 hook_mask = 1 << ops->hooknum;
259 if (hook_mask & target->hooks)
260 return 0;
261
262 /* This target is being called from an invalid chain */
263 return -EINVAL;
264 }
265 return 0;
266 }
267
268 static void nft_match_eval(const struct nft_expr *expr,
269 struct nft_data data[NFT_REG_MAX + 1],
270 const struct nft_pktinfo *pkt)
271 {
272 void *info = nft_expr_priv(expr);
273 struct xt_match *match = expr->ops->data;
274 struct sk_buff *skb = pkt->skb;
275 bool ret;
276
277 nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info);
278
279 ret = match->match(skb, (struct xt_action_param *)&pkt->xt);
280
281 if (pkt->xt.hotdrop) {
282 data[NFT_REG_VERDICT].verdict = NF_DROP;
283 return;
284 }
285
286 switch(ret) {
287 case true:
288 data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
289 break;
290 case false:
291 data[NFT_REG_VERDICT].verdict = NFT_BREAK;
292 break;
293 }
294 }
295
296 static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = {
297 [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING },
298 [NFTA_MATCH_REV] = { .type = NLA_U32 },
299 [NFTA_MATCH_INFO] = { .type = NLA_BINARY },
300 };
301
302 /* struct xt_mtchk_param and xt_tgchk_param look very similar */
303 static void
304 nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
305 struct xt_match *match, void *info,
306 union nft_entry *entry, u8 proto, bool inv)
307 {
308 par->net = &init_net;
309 par->table = ctx->table->name;
310 switch (ctx->afi->family) {
311 case AF_INET:
312 entry->e4.ip.proto = proto;
313 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
314 break;
315 case AF_INET6:
316 entry->e6.ipv6.proto = proto;
317 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
318 break;
319 }
320 par->entryinfo = entry;
321 par->match = match;
322 par->matchinfo = info;
323 if (ctx->chain->flags & NFT_BASE_CHAIN) {
324 const struct nft_base_chain *basechain =
325 nft_base_chain(ctx->chain);
326 const struct nf_hook_ops *ops = &basechain->ops;
327
328 par->hook_mask = 1 << ops->hooknum;
329 }
330 par->family = ctx->afi->family;
331 }
332
333 static void match_compat_from_user(struct xt_match *m, void *in, void *out)
334 {
335 #ifdef CONFIG_COMPAT
336 if (m->compat_from_user) {
337 int pad;
338
339 m->compat_from_user(out, in);
340 pad = XT_ALIGN(m->matchsize) - m->matchsize;
341 if (pad > 0)
342 memset(out + m->matchsize, 0, pad);
343 } else
344 #endif
345 memcpy(out, in, XT_ALIGN(m->matchsize));
346 }
347
348 static int
349 nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
350 const struct nlattr * const tb[])
351 {
352 void *info = nft_expr_priv(expr);
353 struct xt_match *match = expr->ops->data;
354 struct xt_mtchk_param par;
355 size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO]));
356 u8 proto = 0;
357 bool inv = false;
358 union nft_entry e = {};
359 int ret;
360
361 match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info);
362
363 if (ctx->nla[NFTA_RULE_COMPAT]) {
364 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
365 if (ret < 0)
366 goto err;
367 }
368
369 nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv);
370
371 ret = xt_check_match(&par, size, proto, inv);
372 if (ret < 0)
373 goto err;
374
375 return 0;
376 err:
377 module_put(match->me);
378 return ret;
379 }
380
381 static void
382 nft_match_destroy(const struct nft_expr *expr)
383 {
384 struct xt_match *match = expr->ops->data;
385
386 module_put(match->me);
387 }
388
389 static int
390 match_dump_info(struct sk_buff *skb, const struct xt_match *m, const void *in)
391 {
392 int ret;
393
394 #ifdef CONFIG_COMPAT
395 if (m->compat_to_user) {
396 mm_segment_t old_fs;
397 void *out;
398
399 out = kmalloc(XT_ALIGN(m->matchsize), GFP_ATOMIC);
400 if (out == NULL)
401 return -ENOMEM;
402
403 /* We want to reuse existing compat_to_user */
404 old_fs = get_fs();
405 set_fs(KERNEL_DS);
406 m->compat_to_user(out, in);
407 set_fs(old_fs);
408 ret = nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(m->matchsize), out);
409 kfree(out);
410 } else
411 #endif
412 ret = nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(m->matchsize), in);
413
414 return ret;
415 }
416
417 static inline int nft_compat_match_offset(struct xt_match *match)
418 {
419 #ifdef CONFIG_COMPAT
420 return xt_compat_match_offset(match);
421 #else
422 return 0;
423 #endif
424 }
425
426 static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr)
427 {
428 void *info = nft_expr_priv(expr);
429 struct xt_match *match = expr->ops->data;
430
431 if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) ||
432 nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) ||
433 match_dump_info(skb, match, info))
434 goto nla_put_failure;
435
436 return 0;
437
438 nla_put_failure:
439 return -1;
440 }
441
442 static int nft_match_validate(const struct nft_ctx *ctx,
443 const struct nft_expr *expr,
444 const struct nft_data **data)
445 {
446 struct xt_match *match = expr->ops->data;
447 unsigned int hook_mask = 0;
448
449 if (ctx->chain->flags & NFT_BASE_CHAIN) {
450 const struct nft_base_chain *basechain =
451 nft_base_chain(ctx->chain);
452 const struct nf_hook_ops *ops = &basechain->ops;
453
454 hook_mask = 1 << ops->hooknum;
455 if (hook_mask & match->hooks)
456 return 0;
457
458 /* This match is being called from an invalid chain */
459 return -EINVAL;
460 }
461 return 0;
462 }
463
464 static int
465 nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
466 int event, u16 family, const char *name,
467 int rev, int target)
468 {
469 struct nlmsghdr *nlh;
470 struct nfgenmsg *nfmsg;
471 unsigned int flags = portid ? NLM_F_MULTI : 0;
472
473 event |= NFNL_SUBSYS_NFT_COMPAT << 8;
474 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
475 if (nlh == NULL)
476 goto nlmsg_failure;
477
478 nfmsg = nlmsg_data(nlh);
479 nfmsg->nfgen_family = family;
480 nfmsg->version = NFNETLINK_V0;
481 nfmsg->res_id = 0;
482
483 if (nla_put_string(skb, NFTA_COMPAT_NAME, name) ||
484 nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) ||
485 nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target)))
486 goto nla_put_failure;
487
488 nlmsg_end(skb, nlh);
489 return skb->len;
490
491 nlmsg_failure:
492 nla_put_failure:
493 nlmsg_cancel(skb, nlh);
494 return -1;
495 }
496
497 static int
498 nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb,
499 const struct nlmsghdr *nlh, const struct nlattr * const tb[])
500 {
501 int ret = 0, target;
502 struct nfgenmsg *nfmsg;
503 const char *fmt;
504 const char *name;
505 u32 rev;
506 struct sk_buff *skb2;
507
508 if (tb[NFTA_COMPAT_NAME] == NULL ||
509 tb[NFTA_COMPAT_REV] == NULL ||
510 tb[NFTA_COMPAT_TYPE] == NULL)
511 return -EINVAL;
512
513 name = nla_data(tb[NFTA_COMPAT_NAME]);
514 rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV]));
515 target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE]));
516
517 nfmsg = nlmsg_data(nlh);
518
519 switch(nfmsg->nfgen_family) {
520 case AF_INET:
521 fmt = "ipt_%s";
522 break;
523 case AF_INET6:
524 fmt = "ip6t_%s";
525 break;
526 default:
527 pr_err("nft_compat: unsupported protocol %d\n",
528 nfmsg->nfgen_family);
529 return -EINVAL;
530 }
531
532 try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name,
533 rev, target, &ret),
534 fmt, name);
535
536 if (ret < 0)
537 return ret;
538
539 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
540 if (skb2 == NULL)
541 return -ENOMEM;
542
543 /* include the best revision for this extension in the message */
544 if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid,
545 nlh->nlmsg_seq,
546 NFNL_MSG_TYPE(nlh->nlmsg_type),
547 NFNL_MSG_COMPAT_GET,
548 nfmsg->nfgen_family,
549 name, ret, target) <= 0) {
550 kfree_skb(skb2);
551 return -ENOSPC;
552 }
553
554 ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid,
555 MSG_DONTWAIT);
556 if (ret > 0)
557 ret = 0;
558
559 return ret == -EAGAIN ? -ENOBUFS : ret;
560 }
561
562 static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = {
563 [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING,
564 .len = NFT_COMPAT_NAME_MAX-1 },
565 [NFTA_COMPAT_REV] = { .type = NLA_U32 },
566 [NFTA_COMPAT_TYPE] = { .type = NLA_U32 },
567 };
568
569 static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = {
570 [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get,
571 .attr_count = NFTA_COMPAT_MAX,
572 .policy = nfnl_compat_policy_get },
573 };
574
575 static const struct nfnetlink_subsystem nfnl_compat_subsys = {
576 .name = "nft-compat",
577 .subsys_id = NFNL_SUBSYS_NFT_COMPAT,
578 .cb_count = NFNL_MSG_COMPAT_MAX,
579 .cb = nfnl_nft_compat_cb,
580 };
581
582 static LIST_HEAD(nft_match_list);
583
584 struct nft_xt {
585 struct list_head head;
586 struct nft_expr_ops ops;
587 };
588
589 static struct nft_expr_type nft_match_type;
590
591 static const struct nft_expr_ops *
592 nft_match_select_ops(const struct nft_ctx *ctx,
593 const struct nlattr * const tb[])
594 {
595 struct nft_xt *nft_match;
596 struct xt_match *match;
597 char *mt_name;
598 __u32 rev, family;
599
600 if (tb[NFTA_MATCH_NAME] == NULL ||
601 tb[NFTA_MATCH_REV] == NULL ||
602 tb[NFTA_MATCH_INFO] == NULL)
603 return ERR_PTR(-EINVAL);
604
605 mt_name = nla_data(tb[NFTA_MATCH_NAME]);
606 rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV]));
607 family = ctx->afi->family;
608
609 /* Re-use the existing match if it's already loaded. */
610 list_for_each_entry(nft_match, &nft_match_list, head) {
611 struct xt_match *match = nft_match->ops.data;
612
613 if (strcmp(match->name, mt_name) == 0 &&
614 match->revision == rev && match->family == family)
615 return &nft_match->ops;
616 }
617
618 match = xt_request_find_match(family, mt_name, rev);
619 if (IS_ERR(match))
620 return ERR_PTR(-ENOENT);
621
622 /* This is the first time we use this match, allocate operations */
623 nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
624 if (nft_match == NULL)
625 return ERR_PTR(-ENOMEM);
626
627 nft_match->ops.type = &nft_match_type;
628 nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize) +
629 nft_compat_match_offset(match));
630 nft_match->ops.eval = nft_match_eval;
631 nft_match->ops.init = nft_match_init;
632 nft_match->ops.destroy = nft_match_destroy;
633 nft_match->ops.dump = nft_match_dump;
634 nft_match->ops.validate = nft_match_validate;
635 nft_match->ops.data = match;
636
637 list_add(&nft_match->head, &nft_match_list);
638
639 return &nft_match->ops;
640 }
641
642 static void nft_match_release(void)
643 {
644 struct nft_xt *nft_match, *tmp;
645
646 list_for_each_entry_safe(nft_match, tmp, &nft_match_list, head)
647 kfree(nft_match);
648 }
649
650 static struct nft_expr_type nft_match_type __read_mostly = {
651 .name = "match",
652 .select_ops = nft_match_select_ops,
653 .policy = nft_match_policy,
654 .maxattr = NFTA_MATCH_MAX,
655 .owner = THIS_MODULE,
656 };
657
658 static LIST_HEAD(nft_target_list);
659
660 static struct nft_expr_type nft_target_type;
661
662 static const struct nft_expr_ops *
663 nft_target_select_ops(const struct nft_ctx *ctx,
664 const struct nlattr * const tb[])
665 {
666 struct nft_xt *nft_target;
667 struct xt_target *target;
668 char *tg_name;
669 __u32 rev, family;
670
671 if (tb[NFTA_TARGET_NAME] == NULL ||
672 tb[NFTA_TARGET_REV] == NULL ||
673 tb[NFTA_TARGET_INFO] == NULL)
674 return ERR_PTR(-EINVAL);
675
676 tg_name = nla_data(tb[NFTA_TARGET_NAME]);
677 rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV]));
678 family = ctx->afi->family;
679
680 /* Re-use the existing target if it's already loaded. */
681 list_for_each_entry(nft_target, &nft_match_list, head) {
682 struct xt_target *target = nft_target->ops.data;
683
684 if (strcmp(target->name, tg_name) == 0 &&
685 target->revision == rev && target->family == family)
686 return &nft_target->ops;
687 }
688
689 target = xt_request_find_target(family, tg_name, rev);
690 if (IS_ERR(target))
691 return ERR_PTR(-ENOENT);
692
693 /* This is the first time we use this target, allocate operations */
694 nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
695 if (nft_target == NULL)
696 return ERR_PTR(-ENOMEM);
697
698 nft_target->ops.type = &nft_target_type;
699 nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize) +
700 nft_compat_target_offset(target));
701 nft_target->ops.eval = nft_target_eval;
702 nft_target->ops.init = nft_target_init;
703 nft_target->ops.destroy = nft_target_destroy;
704 nft_target->ops.dump = nft_target_dump;
705 nft_target->ops.validate = nft_target_validate;
706 nft_target->ops.data = target;
707
708 list_add(&nft_target->head, &nft_target_list);
709
710 return &nft_target->ops;
711 }
712
713 static void nft_target_release(void)
714 {
715 struct nft_xt *nft_target, *tmp;
716
717 list_for_each_entry_safe(nft_target, tmp, &nft_target_list, head)
718 kfree(nft_target);
719 }
720
721 static struct nft_expr_type nft_target_type __read_mostly = {
722 .name = "target",
723 .select_ops = nft_target_select_ops,
724 .policy = nft_target_policy,
725 .maxattr = NFTA_TARGET_MAX,
726 .owner = THIS_MODULE,
727 };
728
729 static int __init nft_compat_module_init(void)
730 {
731 int ret;
732
733 ret = nft_register_expr(&nft_match_type);
734 if (ret < 0)
735 return ret;
736
737 ret = nft_register_expr(&nft_target_type);
738 if (ret < 0)
739 goto err_match;
740
741 ret = nfnetlink_subsys_register(&nfnl_compat_subsys);
742 if (ret < 0) {
743 pr_err("nft_compat: cannot register with nfnetlink.\n");
744 goto err_target;
745 }
746
747 pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n");
748
749 return ret;
750
751 err_target:
752 nft_unregister_expr(&nft_target_type);
753 err_match:
754 nft_unregister_expr(&nft_match_type);
755 return ret;
756 }
757
758 static void __exit nft_compat_module_exit(void)
759 {
760 nfnetlink_subsys_unregister(&nfnl_compat_subsys);
761 nft_unregister_expr(&nft_target_type);
762 nft_unregister_expr(&nft_match_type);
763 nft_match_release();
764 nft_target_release();
765 }
766
767 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT);
768
769 module_init(nft_compat_module_init);
770 module_exit(nft_compat_module_exit);
771
772 MODULE_LICENSE("GPL");
773 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
774 MODULE_ALIAS_NFT_EXPR("match");
775 MODULE_ALIAS_NFT_EXPR("target");
Linux kernel - Deliverables
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