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coresight: fix comment in of_coresight.c
[linux-2.6-block.git] / net / netfilter / nft_compat.c
CommitLineData
0ca743a5
PNA		 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>
0ca743a5
PNA		 22#include <net/netfilter/nf_tables.h>
23
f3f5dded
PNA		 24static int nft_compat_chain_validate_dependency(const char *tablename,
25 const struct nft_chain *chain)
26{
f3f5dded
PNA		 27 const struct nft_base_chain *basechain;
28
29 if (!tablename || !(chain->flags & NFT_BASE_CHAIN))
30 return 0;
31
f3f5dded 32 basechain = nft_base_chain(chain);
c918687f
PNA		 33 if (strcmp(tablename, "nat") == 0 &&
34 basechain->type->type != NFT_CHAIN_T_NAT)
f3f5dded
PNA		 35 return -EINVAL;
36
37 return 0;
38}
39
0ca743a5
PNA		 40union nft_entry {
41 struct ipt_entry e4;
42 struct ip6t_entry e6;
43};
44
45static inline void
46nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info)
47{
48 par->target = xt;
49 par->targinfo = xt_info;
50 par->hotdrop = false;
51}
52
53static void nft_target_eval(const struct nft_expr *expr,
54 struct nft_data data[NFT_REG_MAX + 1],
55 const struct nft_pktinfo *pkt)
56{
57 void *info = nft_expr_priv(expr);
58 struct xt_target *target = expr->ops->data;
59 struct sk_buff *skb = pkt->skb;
60 int ret;
61
62 nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info);
63
64 ret = target->target(skb, &pkt->xt);
65
66 if (pkt->xt.hotdrop)
67 ret = NF_DROP;
68
69 switch(ret) {
70 case XT_CONTINUE:
71 data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
72 break;
73 default:
74 data[NFT_REG_VERDICT].verdict = ret;
75 break;
76 }
77 return;
78}
79
80static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = {
81 [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING },
82 [NFTA_TARGET_REV] = { .type = NLA_U32 },
83 [NFTA_TARGET_INFO] = { .type = NLA_BINARY },
84};
85
86static void
87nft_target_set_tgchk_param(struct xt_tgchk_param *par,
88 const struct nft_ctx *ctx,
89 struct xt_target *target, void *info,
90 union nft_entry *entry, u8 proto, bool inv)
91{
2daf1b4d 92 par->net = ctx->net;
0ca743a5
PNA		 93 par->table = ctx->table->name;
94 switch (ctx->afi->family) {
95 case AF_INET:
96 entry->e4.ip.proto = proto;
97 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
98 break;
99 case AF_INET6:
100 entry->e6.ipv6.proto = proto;
101 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
102 break;
103 }
104 par->entryinfo = entry;
105 par->target = target;
106 par->targinfo = info;
107 if (ctx->chain->flags & NFT_BASE_CHAIN) {
108 const struct nft_base_chain *basechain =
109 nft_base_chain(ctx->chain);
115a60b1 110 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 111
112 par->hook_mask = 1 << ops->hooknum;
493618a9
PNA		 113 } else {
114 par->hook_mask = 0;
0ca743a5
PNA		 115 }
116 par->family = ctx->afi->family;
117}
118
119static void target_compat_from_user(struct xt_target *t, void *in, void *out)
120{
756c1b1a 121 int pad;
0ca743a5 122
756c1b1a
PNA		 123 memcpy(out, in, t->targetsize);
124 pad = XT_ALIGN(t->targetsize) - t->targetsize;
125 if (pad > 0)
126 memset(out + t->targetsize, 0, pad);
0ca743a5
PNA		 127}
128
129static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = {
130 [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 },
131 [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 },
132};
133
8691a9a3 134static int nft_parse_compat(const struct nlattr *attr, u8 *proto, bool *inv)
0ca743a5
PNA		 135{
136 struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1];
137 u32 flags;
138 int err;
139
140 err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr,
141 nft_rule_compat_policy);
142 if (err < 0)
143 return err;
144
145 if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS])
146 return -EINVAL;
147
148 flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS]));
149 if (flags & ~NFT_RULE_COMPAT_F_MASK)
150 return -EINVAL;
151 if (flags & NFT_RULE_COMPAT_F_INV)
152 *inv = true;
153
8691a9a3
PNA		 154 *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
155 return 0;
0ca743a5
PNA		 156}
157
158static int
159nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
160 const struct nlattr * const tb[])
161{
162 void *info = nft_expr_priv(expr);
163 struct xt_target *target = expr->ops->data;
164 struct xt_tgchk_param par;
165 size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO]));
166 u8 proto = 0;
167 bool inv = false;
168 union nft_entry e = {};
169 int ret;
170
f3f5dded
PNA		 171 ret = nft_compat_chain_validate_dependency(target->table, ctx->chain);
172 if (ret < 0)
173 goto err;
174
0ca743a5
PNA		 175 target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info);
176
8691a9a3
PNA		 177 if (ctx->nla[NFTA_RULE_COMPAT]) {
178 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
179 if (ret < 0)
180 goto err;
181 }
0ca743a5
PNA		 182
183 nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv);
184
185 ret = xt_check_target(&par, size, proto, inv);
186 if (ret < 0)
187 goto err;
188
189 /* The standard target cannot be used */
190 if (target->target == NULL) {
191 ret = -EINVAL;
192 goto err;
193 }
194
195 return 0;
196err:
197 module_put(target->me);
198 return ret;
199}
200
201static void
62472bce 202nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
0ca743a5
PNA		 203{
204 struct xt_target *target = expr->ops->data;
3d9b1421
PNA		 205 void *info = nft_expr_priv(expr);
206 struct xt_tgdtor_param par;
207
208 par.net = ctx->net;
209 par.target = target;
210 par.targinfo = info;
211 par.family = ctx->afi->family;
212 if (par.target->destroy != NULL)
213 par.target->destroy(&par);
0ca743a5
PNA		 214
215 module_put(target->me);
216}
217
0ca743a5
PNA		 218static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr)
219{
220 const struct xt_target *target = expr->ops->data;
221 void *info = nft_expr_priv(expr);
222
223 if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) ||
224 nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) ||
756c1b1a 225 nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(target->targetsize), info))
0ca743a5
PNA		 226 goto nla_put_failure;
227
228 return 0;
229
230nla_put_failure:
231 return -1;
232}
233
234static int nft_target_validate(const struct nft_ctx *ctx,
235 const struct nft_expr *expr,
236 const struct nft_data **data)
237{
238 struct xt_target *target = expr->ops->data;
239 unsigned int hook_mask = 0;
f3f5dded 240 int ret;
0ca743a5
PNA		 241
242 if (ctx->chain->flags & NFT_BASE_CHAIN) {
243 const struct nft_base_chain *basechain =
244 nft_base_chain(ctx->chain);
115a60b1 245 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 246
247 hook_mask = 1 << ops->hooknum;
f3f5dded
PNA		 248 if (!(hook_mask & target->hooks))
249 return -EINVAL;
0ca743a5 250
f3f5dded
PNA		 251 ret = nft_compat_chain_validate_dependency(target->table,
252 ctx->chain);
253 if (ret < 0)
254 return ret;
0ca743a5
PNA		 255 }
256 return 0;
257}
258
259static void nft_match_eval(const struct nft_expr *expr,
260 struct nft_data data[NFT_REG_MAX + 1],
261 const struct nft_pktinfo *pkt)
262{
263 void *info = nft_expr_priv(expr);
264 struct xt_match *match = expr->ops->data;
265 struct sk_buff *skb = pkt->skb;
266 bool ret;
267
268 nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info);
269
270 ret = match->match(skb, (struct xt_action_param *)&pkt->xt);
271
272 if (pkt->xt.hotdrop) {
273 data[NFT_REG_VERDICT].verdict = NF_DROP;
274 return;
275 }
276
277 switch(ret) {
278 case true:
279 data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
280 break;
281 case false:
282 data[NFT_REG_VERDICT].verdict = NFT_BREAK;
283 break;
284 }
285}
286
287static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = {
288 [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING },
289 [NFTA_MATCH_REV] = { .type = NLA_U32 },
290 [NFTA_MATCH_INFO] = { .type = NLA_BINARY },
291};
292
293/* struct xt_mtchk_param and xt_tgchk_param look very similar */
294static void
295nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
296 struct xt_match *match, void *info,
297 union nft_entry *entry, u8 proto, bool inv)
298{
2daf1b4d 299 par->net = ctx->net;
0ca743a5
PNA		 300 par->table = ctx->table->name;
301 switch (ctx->afi->family) {
302 case AF_INET:
303 entry->e4.ip.proto = proto;
304 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
305 break;
306 case AF_INET6:
307 entry->e6.ipv6.proto = proto;
308 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
309 break;
310 }
311 par->entryinfo = entry;
312 par->match = match;
313 par->matchinfo = info;
314 if (ctx->chain->flags & NFT_BASE_CHAIN) {
315 const struct nft_base_chain *basechain =
316 nft_base_chain(ctx->chain);
115a60b1 317 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 318
319 par->hook_mask = 1 << ops->hooknum;
493618a9
PNA		 320 } else {
321 par->hook_mask = 0;
0ca743a5
PNA		 322 }
323 par->family = ctx->afi->family;
324}
325
326static void match_compat_from_user(struct xt_match *m, void *in, void *out)
327{
756c1b1a
PNA		 328 int pad;
329
330 memcpy(out, in, m->matchsize);
331 pad = XT_ALIGN(m->matchsize) - m->matchsize;
332 if (pad > 0)
333 memset(out + m->matchsize, 0, pad);
0ca743a5
PNA		 334}
335
336static int
337nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
338 const struct nlattr * const tb[])
339{
340 void *info = nft_expr_priv(expr);
341 struct xt_match *match = expr->ops->data;
342 struct xt_mtchk_param par;
343 size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO]));
344 u8 proto = 0;
345 bool inv = false;
346 union nft_entry e = {};
347 int ret;
348
afefb6f9 349 ret = nft_compat_chain_validate_dependency(match->table, ctx->chain);
f3f5dded
PNA		 350 if (ret < 0)
351 goto err;
352
0ca743a5
PNA		 353 match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info);
354
8691a9a3
PNA		 355 if (ctx->nla[NFTA_RULE_COMPAT]) {
356 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
357 if (ret < 0)
358 goto err;
359 }
0ca743a5
PNA		 360
361 nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv);
362
363 ret = xt_check_match(&par, size, proto, inv);
364 if (ret < 0)
365 goto err;
366
367 return 0;
368err:
369 module_put(match->me);
370 return ret;
371}
372
373static void
62472bce 374nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
0ca743a5
PNA		 375{
376 struct xt_match *match = expr->ops->data;
3d9b1421
PNA		 377 void *info = nft_expr_priv(expr);
378 struct xt_mtdtor_param par;
379
380 par.net = ctx->net;
381 par.match = match;
382 par.matchinfo = info;
383 par.family = ctx->afi->family;
384 if (par.match->destroy != NULL)
385 par.match->destroy(&par);
0ca743a5
PNA		 386
387 module_put(match->me);
388}
389
0ca743a5
PNA		 390static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr)
391{
392 void *info = nft_expr_priv(expr);
393 struct xt_match *match = expr->ops->data;
394
395 if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) ||
396 nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) ||
756c1b1a 397 nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(match->matchsize), info))
0ca743a5
PNA		 398 goto nla_put_failure;
399
400 return 0;
401
402nla_put_failure:
403 return -1;
404}
405
406static int nft_match_validate(const struct nft_ctx *ctx,
407 const struct nft_expr *expr,
408 const struct nft_data **data)
409{
410 struct xt_match *match = expr->ops->data;
411 unsigned int hook_mask = 0;
f3f5dded 412 int ret;
0ca743a5
PNA		 413
414 if (ctx->chain->flags & NFT_BASE_CHAIN) {
415 const struct nft_base_chain *basechain =
416 nft_base_chain(ctx->chain);
115a60b1 417 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 418
419 hook_mask = 1 << ops->hooknum;
f3f5dded
PNA		 420 if (!(hook_mask & match->hooks))
421 return -EINVAL;
0ca743a5 422
afefb6f9 423 ret = nft_compat_chain_validate_dependency(match->table,
f3f5dded
PNA		 424 ctx->chain);
425 if (ret < 0)
426 return ret;
0ca743a5
PNA		 427 }
428 return 0;
429}
430
431static int
432nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
433 int event, u16 family, const char *name,
434 int rev, int target)
435{
436 struct nlmsghdr *nlh;
437 struct nfgenmsg *nfmsg;
438 unsigned int flags = portid ? NLM_F_MULTI : 0;
439
440 event |= NFNL_SUBSYS_NFT_COMPAT << 8;
441 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
442 if (nlh == NULL)
443 goto nlmsg_failure;
444
445 nfmsg = nlmsg_data(nlh);
446 nfmsg->nfgen_family = family;
447 nfmsg->version = NFNETLINK_V0;
448 nfmsg->res_id = 0;
449
450 if (nla_put_string(skb, NFTA_COMPAT_NAME, name) ||
451 nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) ||
452 nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target)))
453 goto nla_put_failure;
454
455 nlmsg_end(skb, nlh);
456 return skb->len;
457
458nlmsg_failure:
459nla_put_failure:
460 nlmsg_cancel(skb, nlh);
461 return -1;
462}
463
464static int
465nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb,
466 const struct nlmsghdr *nlh, const struct nlattr * const tb[])
467{
468 int ret = 0, target;
469 struct nfgenmsg *nfmsg;
470 const char *fmt;
471 const char *name;
472 u32 rev;
473 struct sk_buff *skb2;
474
475 if (tb[NFTA_COMPAT_NAME] == NULL ||
476 tb[NFTA_COMPAT_REV] == NULL ||
477 tb[NFTA_COMPAT_TYPE] == NULL)
478 return -EINVAL;
479
480 name = nla_data(tb[NFTA_COMPAT_NAME]);
481 rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV]));
482 target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE]));
483
484 nfmsg = nlmsg_data(nlh);
485
486 switch(nfmsg->nfgen_family) {
487 case AF_INET:
488 fmt = "ipt_%s";
489 break;
490 case AF_INET6:
491 fmt = "ip6t_%s";
492 break;
493 default:
494 pr_err("nft_compat: unsupported protocol %d\n",
495 nfmsg->nfgen_family);
496 return -EINVAL;
497 }
498
499 try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name,
500 rev, target, &ret),
501 fmt, name);
502
503 if (ret < 0)
504 return ret;
505
506 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
507 if (skb2 == NULL)
508 return -ENOMEM;
509
510 /* include the best revision for this extension in the message */
511 if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid,
512 nlh->nlmsg_seq,
513 NFNL_MSG_TYPE(nlh->nlmsg_type),
514 NFNL_MSG_COMPAT_GET,
515 nfmsg->nfgen_family,
516 name, ret, target) <= 0) {
517 kfree_skb(skb2);
518 return -ENOSPC;
519 }
520
521 ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid,
522 MSG_DONTWAIT);
523 if (ret > 0)
524 ret = 0;
525
526 return ret == -EAGAIN ? -ENOBUFS : ret;
527}
528
529static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = {
530 [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING,
531 .len = NFT_COMPAT_NAME_MAX-1 },
532 [NFTA_COMPAT_REV] = { .type = NLA_U32 },
533 [NFTA_COMPAT_TYPE] = { .type = NLA_U32 },
534};
535
536static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = {
537 [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get,
538 .attr_count = NFTA_COMPAT_MAX,
539 .policy = nfnl_compat_policy_get },
540};
541
542static const struct nfnetlink_subsystem nfnl_compat_subsys = {
543 .name = "nft-compat",
544 .subsys_id = NFNL_SUBSYS_NFT_COMPAT,
545 .cb_count = NFNL_MSG_COMPAT_MAX,
546 .cb = nfnl_nft_compat_cb,
547};
548
549static LIST_HEAD(nft_match_list);
550
551struct nft_xt {
552 struct list_head head;
553 struct nft_expr_ops ops;
554};
555
556static struct nft_expr_type nft_match_type;
557
558static const struct nft_expr_ops *
559nft_match_select_ops(const struct nft_ctx *ctx,
560 const struct nlattr * const tb[])
561{
562 struct nft_xt *nft_match;
563 struct xt_match *match;
564 char *mt_name;
565 __u32 rev, family;
566
567 if (tb[NFTA_MATCH_NAME] == NULL ||
568 tb[NFTA_MATCH_REV] == NULL ||
569 tb[NFTA_MATCH_INFO] == NULL)
570 return ERR_PTR(-EINVAL);
571
572 mt_name = nla_data(tb[NFTA_MATCH_NAME]);
573 rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV]));
574 family = ctx->afi->family;
575
576 /* Re-use the existing match if it's already loaded. */
577 list_for_each_entry(nft_match, &nft_match_list, head) {
578 struct xt_match *match = nft_match->ops.data;
579
580 if (strcmp(match->name, mt_name) == 0 &&
581 match->revision == rev && match->family == family)
582 return &nft_match->ops;
583 }
584
585 match = xt_request_find_match(family, mt_name, rev);
586 if (IS_ERR(match))
587 return ERR_PTR(-ENOENT);
588
589 /* This is the first time we use this match, allocate operations */
590 nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
591 if (nft_match == NULL)
592 return ERR_PTR(-ENOMEM);
593
594 nft_match->ops.type = &nft_match_type;
756c1b1a 595 nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize));
0ca743a5
PNA		 596 nft_match->ops.eval = nft_match_eval;
597 nft_match->ops.init = nft_match_init;
598 nft_match->ops.destroy = nft_match_destroy;
599 nft_match->ops.dump = nft_match_dump;
600 nft_match->ops.validate = nft_match_validate;
601 nft_match->ops.data = match;
602
603 list_add(&nft_match->head, &nft_match_list);
604
605 return &nft_match->ops;
606}
607
608static void nft_match_release(void)
609{
c359c415 610 struct nft_xt *nft_match, *tmp;
0ca743a5 611
c359c415 612 list_for_each_entry_safe(nft_match, tmp, &nft_match_list, head)
0ca743a5
PNA		 613 kfree(nft_match);
614}
615
616static struct nft_expr_type nft_match_type __read_mostly = {
617 .name = "match",
618 .select_ops = nft_match_select_ops,
619 .policy = nft_match_policy,
620 .maxattr = NFTA_MATCH_MAX,
621 .owner = THIS_MODULE,
622};
623
624static LIST_HEAD(nft_target_list);
625
626static struct nft_expr_type nft_target_type;
627
628static const struct nft_expr_ops *
629nft_target_select_ops(const struct nft_ctx *ctx,
630 const struct nlattr * const tb[])
631{
632 struct nft_xt *nft_target;
633 struct xt_target *target;
634 char *tg_name;
635 __u32 rev, family;
636
637 if (tb[NFTA_TARGET_NAME] == NULL ||
638 tb[NFTA_TARGET_REV] == NULL ||
639 tb[NFTA_TARGET_INFO] == NULL)
640 return ERR_PTR(-EINVAL);
641
642 tg_name = nla_data(tb[NFTA_TARGET_NAME]);
643 rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV]));
644 family = ctx->afi->family;
645
646 /* Re-use the existing target if it's already loaded. */
7965ee93 647 list_for_each_entry(nft_target, &nft_target_list, head) {
0ca743a5
PNA		 648 struct xt_target *target = nft_target->ops.data;
649
650 if (strcmp(target->name, tg_name) == 0 &&
651 target->revision == rev && target->family == family)
652 return &nft_target->ops;
653 }
654
655 target = xt_request_find_target(family, tg_name, rev);
656 if (IS_ERR(target))
657 return ERR_PTR(-ENOENT);
658
659 /* This is the first time we use this target, allocate operations */
660 nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
661 if (nft_target == NULL)
662 return ERR_PTR(-ENOMEM);
663
664 nft_target->ops.type = &nft_target_type;
756c1b1a 665 nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize));
0ca743a5
PNA		 666 nft_target->ops.eval = nft_target_eval;
667 nft_target->ops.init = nft_target_init;
668 nft_target->ops.destroy = nft_target_destroy;
669 nft_target->ops.dump = nft_target_dump;
670 nft_target->ops.validate = nft_target_validate;
671 nft_target->ops.data = target;
672
673 list_add(&nft_target->head, &nft_target_list);
674
675 return &nft_target->ops;
676}
677
678static void nft_target_release(void)
679{
c359c415 680 struct nft_xt *nft_target, *tmp;
0ca743a5 681
c359c415 682 list_for_each_entry_safe(nft_target, tmp, &nft_target_list, head)
0ca743a5
PNA		 683 kfree(nft_target);
684}
685
686static struct nft_expr_type nft_target_type __read_mostly = {
687 .name = "target",
688 .select_ops = nft_target_select_ops,
689 .policy = nft_target_policy,
690 .maxattr = NFTA_TARGET_MAX,
691 .owner = THIS_MODULE,
692};
693
694static int __init nft_compat_module_init(void)
695{
696 int ret;
697
698 ret = nft_register_expr(&nft_match_type);
699 if (ret < 0)
700 return ret;
701
702 ret = nft_register_expr(&nft_target_type);
703 if (ret < 0)
704 goto err_match;
705
706 ret = nfnetlink_subsys_register(&nfnl_compat_subsys);
707 if (ret < 0) {
708 pr_err("nft_compat: cannot register with nfnetlink.\n");
709 goto err_target;
710 }
711
712 pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n");
713
714 return ret;
715
716err_target:
717 nft_unregister_expr(&nft_target_type);
718err_match:
719 nft_unregister_expr(&nft_match_type);
720 return ret;
721}
722
723static void __exit nft_compat_module_exit(void)
724{
725 nfnetlink_subsys_unregister(&nfnl_compat_subsys);
726 nft_unregister_expr(&nft_target_type);
727 nft_unregister_expr(&nft_match_type);
728 nft_match_release();
729 nft_target_release();
730}
731
732MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT);
733
734module_init(nft_compat_module_init);
735module_exit(nft_compat_module_exit);
736
737MODULE_LICENSE("GPL");
738MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
739MODULE_ALIAS_NFT_EXPR("match");
740MODULE_ALIAS_NFT_EXPR("target");
Linux 6.x block layer and io_uring tree(s)