1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
4 * Copyright (c) 2014 Intel Corporation
5 * Author: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
6 *
7 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/netlink.h>
12 #include <linux/netfilter.h>
13 #include <linux/netfilter/nf_tables.h>
14 #include <linux/in.h>
15 #include <linux/ip.h>
16 #include <linux/ipv6.h>
17 #include <linux/smp.h>
18 #include <linux/static_key.h>
19 #include <net/dst.h>
20 #include <net/sock.h>
21 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
22 #include <net/netfilter/nf_tables.h>
23 #include <net/netfilter/nf_tables_core.h>
24 #include <net/netfilter/nft_meta.h>
25 #include <net/netfilter/nf_tables_offload.h>
26
27 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
28
29 #define NFT_META_SECS_PER_MINUTE 60
30 #define NFT_META_SECS_PER_HOUR 3600
31 #define NFT_META_SECS_PER_DAY 86400
32 #define NFT_META_DAYS_PER_WEEK 7
33
34 static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
35
nft_meta_weekday(time64_t secs)36 static u8 nft_meta_weekday(time64_t secs)
37 {
38 unsigned int dse;
39 u8 wday;
40
41 secs -= NFT_META_SECS_PER_MINUTE * sys_tz.tz_minuteswest;
42 dse = div_u64(secs, NFT_META_SECS_PER_DAY);
43 wday = (4 + dse) % NFT_META_DAYS_PER_WEEK;
44
45 return wday;
46 }
47
nft_meta_hour(time64_t secs)48 static u32 nft_meta_hour(time64_t secs)
49 {
50 struct tm tm;
51
52 time64_to_tm(secs, 0, &tm);
53
54 return tm.tm_hour * NFT_META_SECS_PER_HOUR
55 + tm.tm_min * NFT_META_SECS_PER_MINUTE
56 + tm.tm_sec;
57 }
58
nft_meta_get_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)59 void nft_meta_get_eval(const struct nft_expr *expr,
60 struct nft_regs *regs,
61 const struct nft_pktinfo *pkt)
62 {
63 const struct nft_meta *priv = nft_expr_priv(expr);
64 const struct sk_buff *skb = pkt->skb;
65 const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
66 struct sock *sk;
67 u32 *dest = ®s->data[priv->dreg];
68
69 switch (priv->key) {
70 case NFT_META_LEN:
71 *dest = skb->len;
72 break;
73 case NFT_META_PROTOCOL:
74 nft_reg_store16(dest, (__force u16)skb->protocol);
75 break;
76 case NFT_META_NFPROTO:
77 nft_reg_store8(dest, nft_pf(pkt));
78 break;
79 case NFT_META_L4PROTO:
80 if (!pkt->tprot_set)
81 goto err;
82 nft_reg_store8(dest, pkt->tprot);
83 break;
84 case NFT_META_PRIORITY:
85 *dest = skb->priority;
86 break;
87 case NFT_META_MARK:
88 *dest = skb->mark;
89 break;
90 case NFT_META_IIF:
91 *dest = in ? in->ifindex : 0;
92 break;
93 case NFT_META_OIF:
94 *dest = out ? out->ifindex : 0;
95 break;
96 case NFT_META_IIFNAME:
97 strncpy((char *)dest, in ? in->name : "", IFNAMSIZ);
98 break;
99 case NFT_META_OIFNAME:
100 strncpy((char *)dest, out ? out->name : "", IFNAMSIZ);
101 break;
102 case NFT_META_IIFTYPE:
103 if (in == NULL)
104 goto err;
105 nft_reg_store16(dest, in->type);
106 break;
107 case NFT_META_OIFTYPE:
108 if (out == NULL)
109 goto err;
110 nft_reg_store16(dest, out->type);
111 break;
112 case NFT_META_SKUID:
113 sk = skb_to_full_sk(skb);
114 if (!sk || !sk_fullsock(sk) ||
115 !net_eq(nft_net(pkt), sock_net(sk)))
116 goto err;
117
118 read_lock_bh(&sk->sk_callback_lock);
119 if (sk->sk_socket == NULL ||
120 sk->sk_socket->file == NULL) {
121 read_unlock_bh(&sk->sk_callback_lock);
122 goto err;
123 }
124
125 *dest = from_kuid_munged(&init_user_ns,
126 sk->sk_socket->file->f_cred->fsuid);
127 read_unlock_bh(&sk->sk_callback_lock);
128 break;
129 case NFT_META_SKGID:
130 sk = skb_to_full_sk(skb);
131 if (!sk || !sk_fullsock(sk) ||
132 !net_eq(nft_net(pkt), sock_net(sk)))
133 goto err;
134
135 read_lock_bh(&sk->sk_callback_lock);
136 if (sk->sk_socket == NULL ||
137 sk->sk_socket->file == NULL) {
138 read_unlock_bh(&sk->sk_callback_lock);
139 goto err;
140 }
141 *dest = from_kgid_munged(&init_user_ns,
142 sk->sk_socket->file->f_cred->fsgid);
143 read_unlock_bh(&sk->sk_callback_lock);
144 break;
145 #ifdef CONFIG_IP_ROUTE_CLASSID
146 case NFT_META_RTCLASSID: {
147 const struct dst_entry *dst = skb_dst(skb);
148
149 if (dst == NULL)
150 goto err;
151 *dest = dst->tclassid;
152 break;
153 }
154 #endif
155 #ifdef CONFIG_NETWORK_SECMARK
156 case NFT_META_SECMARK:
157 *dest = skb->secmark;
158 break;
159 #endif
160 case NFT_META_PKTTYPE:
161 if (skb->pkt_type != PACKET_LOOPBACK) {
162 nft_reg_store8(dest, skb->pkt_type);
163 break;
164 }
165
166 switch (nft_pf(pkt)) {
167 case NFPROTO_IPV4:
168 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
169 nft_reg_store8(dest, PACKET_MULTICAST);
170 else
171 nft_reg_store8(dest, PACKET_BROADCAST);
172 break;
173 case NFPROTO_IPV6:
174 nft_reg_store8(dest, PACKET_MULTICAST);
175 break;
176 case NFPROTO_NETDEV:
177 switch (skb->protocol) {
178 case htons(ETH_P_IP): {
179 int noff = skb_network_offset(skb);
180 struct iphdr *iph, _iph;
181
182 iph = skb_header_pointer(skb, noff,
183 sizeof(_iph), &_iph);
184 if (!iph)
185 goto err;
186
187 if (ipv4_is_multicast(iph->daddr))
188 nft_reg_store8(dest, PACKET_MULTICAST);
189 else
190 nft_reg_store8(dest, PACKET_BROADCAST);
191
192 break;
193 }
194 case htons(ETH_P_IPV6):
195 nft_reg_store8(dest, PACKET_MULTICAST);
196 break;
197 default:
198 WARN_ON_ONCE(1);
199 goto err;
200 }
201 break;
202 default:
203 WARN_ON_ONCE(1);
204 goto err;
205 }
206 break;
207 case NFT_META_CPU:
208 *dest = raw_smp_processor_id();
209 break;
210 case NFT_META_IIFGROUP:
211 if (in == NULL)
212 goto err;
213 *dest = in->group;
214 break;
215 case NFT_META_OIFGROUP:
216 if (out == NULL)
217 goto err;
218 *dest = out->group;
219 break;
220 #ifdef CONFIG_CGROUP_NET_CLASSID
221 case NFT_META_CGROUP:
222 sk = skb_to_full_sk(skb);
223 if (!sk || !sk_fullsock(sk) ||
224 !net_eq(nft_net(pkt), sock_net(sk)))
225 goto err;
226 *dest = sock_cgroup_classid(&sk->sk_cgrp_data);
227 break;
228 #endif
229 case NFT_META_PRANDOM: {
230 struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
231 *dest = prandom_u32_state(state);
232 break;
233 }
234 #ifdef CONFIG_XFRM
235 case NFT_META_SECPATH:
236 nft_reg_store8(dest, secpath_exists(skb));
237 break;
238 #endif
239 case NFT_META_IIFKIND:
240 if (in == NULL || in->rtnl_link_ops == NULL)
241 goto err;
242 strncpy((char *)dest, in->rtnl_link_ops->kind, IFNAMSIZ);
243 break;
244 case NFT_META_OIFKIND:
245 if (out == NULL || out->rtnl_link_ops == NULL)
246 goto err;
247 strncpy((char *)dest, out->rtnl_link_ops->kind, IFNAMSIZ);
248 break;
249 case NFT_META_TIME_NS:
250 nft_reg_store64((u64 *)dest, ktime_get_real_ns());
251 break;
252 case NFT_META_TIME_DAY:
253 nft_reg_store8(dest, nft_meta_weekday(ktime_get_real_seconds()));
254 break;
255 case NFT_META_TIME_HOUR:
256 *dest = nft_meta_hour(ktime_get_real_seconds());
257 break;
258 default:
259 WARN_ON(1);
260 goto err;
261 }
262 return;
263
264 err:
265 regs->verdict.code = NFT_BREAK;
266 }
267 EXPORT_SYMBOL_GPL(nft_meta_get_eval);
268
nft_meta_set_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)269 void nft_meta_set_eval(const struct nft_expr *expr,
270 struct nft_regs *regs,
271 const struct nft_pktinfo *pkt)
272 {
273 const struct nft_meta *meta = nft_expr_priv(expr);
274 struct sk_buff *skb = pkt->skb;
275 u32 *sreg = ®s->data[meta->sreg];
276 u32 value = *sreg;
277 u8 value8;
278
279 switch (meta->key) {
280 case NFT_META_MARK:
281 skb->mark = value;
282 break;
283 case NFT_META_PRIORITY:
284 skb->priority = value;
285 break;
286 case NFT_META_PKTTYPE:
287 value8 = nft_reg_load8(sreg);
288
289 if (skb->pkt_type != value8 &&
290 skb_pkt_type_ok(value8) &&
291 skb_pkt_type_ok(skb->pkt_type))
292 skb->pkt_type = value8;
293 break;
294 case NFT_META_NFTRACE:
295 value8 = nft_reg_load8(sreg);
296
297 skb->nf_trace = !!value8;
298 break;
299 #ifdef CONFIG_NETWORK_SECMARK
300 case NFT_META_SECMARK:
301 skb->secmark = value;
302 break;
303 #endif
304 default:
305 WARN_ON(1);
306 }
307 }
308 EXPORT_SYMBOL_GPL(nft_meta_set_eval);
309
310 const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
311 [NFTA_META_DREG] = { .type = NLA_U32 },
312 [NFTA_META_KEY] = { .type = NLA_U32 },
313 [NFTA_META_SREG] = { .type = NLA_U32 },
314 };
315 EXPORT_SYMBOL_GPL(nft_meta_policy);
316
nft_meta_get_init(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nlattr * const tb[])317 int nft_meta_get_init(const struct nft_ctx *ctx,
318 const struct nft_expr *expr,
319 const struct nlattr * const tb[])
320 {
321 struct nft_meta *priv = nft_expr_priv(expr);
322 unsigned int len;
323
324 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
325 switch (priv->key) {
326 case NFT_META_PROTOCOL:
327 case NFT_META_IIFTYPE:
328 case NFT_META_OIFTYPE:
329 len = sizeof(u16);
330 break;
331 case NFT_META_NFPROTO:
332 case NFT_META_L4PROTO:
333 case NFT_META_LEN:
334 case NFT_META_PRIORITY:
335 case NFT_META_MARK:
336 case NFT_META_IIF:
337 case NFT_META_OIF:
338 case NFT_META_SKUID:
339 case NFT_META_SKGID:
340 #ifdef CONFIG_IP_ROUTE_CLASSID
341 case NFT_META_RTCLASSID:
342 #endif
343 #ifdef CONFIG_NETWORK_SECMARK
344 case NFT_META_SECMARK:
345 #endif
346 case NFT_META_PKTTYPE:
347 case NFT_META_CPU:
348 case NFT_META_IIFGROUP:
349 case NFT_META_OIFGROUP:
350 #ifdef CONFIG_CGROUP_NET_CLASSID
351 case NFT_META_CGROUP:
352 #endif
353 len = sizeof(u32);
354 break;
355 case NFT_META_IIFNAME:
356 case NFT_META_OIFNAME:
357 case NFT_META_IIFKIND:
358 case NFT_META_OIFKIND:
359 len = IFNAMSIZ;
360 break;
361 case NFT_META_PRANDOM:
362 prandom_init_once(&nft_prandom_state);
363 len = sizeof(u32);
364 break;
365 #ifdef CONFIG_XFRM
366 case NFT_META_SECPATH:
367 len = sizeof(u8);
368 break;
369 #endif
370 case NFT_META_TIME_NS:
371 len = sizeof(u64);
372 break;
373 case NFT_META_TIME_DAY:
374 len = sizeof(u8);
375 break;
376 case NFT_META_TIME_HOUR:
377 len = sizeof(u32);
378 break;
379 default:
380 return -EOPNOTSUPP;
381 }
382
383 return nft_parse_register_store(ctx, tb[NFTA_META_DREG], &priv->dreg,
384 NULL, NFT_DATA_VALUE, len);
385 }
386 EXPORT_SYMBOL_GPL(nft_meta_get_init);
387
nft_meta_get_validate(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nft_data ** data)388 static int nft_meta_get_validate(const struct nft_ctx *ctx,
389 const struct nft_expr *expr,
390 const struct nft_data **data)
391 {
392 #ifdef CONFIG_XFRM
393 const struct nft_meta *priv = nft_expr_priv(expr);
394 unsigned int hooks;
395
396 if (priv->key != NFT_META_SECPATH)
397 return 0;
398
399 switch (ctx->family) {
400 case NFPROTO_NETDEV:
401 hooks = 1 << NF_NETDEV_INGRESS;
402 break;
403 case NFPROTO_IPV4:
404 case NFPROTO_IPV6:
405 case NFPROTO_INET:
406 hooks = (1 << NF_INET_PRE_ROUTING) |
407 (1 << NF_INET_LOCAL_IN) |
408 (1 << NF_INET_FORWARD);
409 break;
410 default:
411 return -EOPNOTSUPP;
412 }
413
414 return nft_chain_validate_hooks(ctx->chain, hooks);
415 #else
416 return 0;
417 #endif
418 }
419
nft_meta_set_validate(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nft_data ** data)420 int nft_meta_set_validate(const struct nft_ctx *ctx,
421 const struct nft_expr *expr,
422 const struct nft_data **data)
423 {
424 struct nft_meta *priv = nft_expr_priv(expr);
425 unsigned int hooks;
426
427 if (priv->key != NFT_META_PKTTYPE)
428 return 0;
429
430 switch (ctx->family) {
431 case NFPROTO_BRIDGE:
432 hooks = 1 << NF_BR_PRE_ROUTING;
433 break;
434 case NFPROTO_NETDEV:
435 hooks = 1 << NF_NETDEV_INGRESS;
436 break;
437 case NFPROTO_IPV4:
438 case NFPROTO_IPV6:
439 case NFPROTO_INET:
440 hooks = 1 << NF_INET_PRE_ROUTING;
441 break;
442 default:
443 return -EOPNOTSUPP;
444 }
445
446 return nft_chain_validate_hooks(ctx->chain, hooks);
447 }
448 EXPORT_SYMBOL_GPL(nft_meta_set_validate);
449
nft_meta_set_init(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nlattr * const tb[])450 int nft_meta_set_init(const struct nft_ctx *ctx,
451 const struct nft_expr *expr,
452 const struct nlattr * const tb[])
453 {
454 struct nft_meta *priv = nft_expr_priv(expr);
455 unsigned int len;
456 int err;
457
458 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
459 switch (priv->key) {
460 case NFT_META_MARK:
461 case NFT_META_PRIORITY:
462 #ifdef CONFIG_NETWORK_SECMARK
463 case NFT_META_SECMARK:
464 #endif
465 len = sizeof(u32);
466 break;
467 case NFT_META_NFTRACE:
468 len = sizeof(u8);
469 break;
470 case NFT_META_PKTTYPE:
471 len = sizeof(u8);
472 break;
473 default:
474 return -EOPNOTSUPP;
475 }
476
477 err = nft_parse_register_load(tb[NFTA_META_SREG], &priv->sreg, len);
478 if (err < 0)
479 return err;
480
481 if (priv->key == NFT_META_NFTRACE)
482 static_branch_inc(&nft_trace_enabled);
483
484 return 0;
485 }
486 EXPORT_SYMBOL_GPL(nft_meta_set_init);
487
nft_meta_get_dump(struct sk_buff * skb,const struct nft_expr * expr)488 int nft_meta_get_dump(struct sk_buff *skb,
489 const struct nft_expr *expr)
490 {
491 const struct nft_meta *priv = nft_expr_priv(expr);
492
493 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
494 goto nla_put_failure;
495 if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
496 goto nla_put_failure;
497 return 0;
498
499 nla_put_failure:
500 return -1;
501 }
502 EXPORT_SYMBOL_GPL(nft_meta_get_dump);
503
nft_meta_set_dump(struct sk_buff * skb,const struct nft_expr * expr)504 int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
505 {
506 const struct nft_meta *priv = nft_expr_priv(expr);
507
508 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
509 goto nla_put_failure;
510 if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
511 goto nla_put_failure;
512
513 return 0;
514
515 nla_put_failure:
516 return -1;
517 }
518 EXPORT_SYMBOL_GPL(nft_meta_set_dump);
519
nft_meta_set_destroy(const struct nft_ctx * ctx,const struct nft_expr * expr)520 void nft_meta_set_destroy(const struct nft_ctx *ctx,
521 const struct nft_expr *expr)
522 {
523 const struct nft_meta *priv = nft_expr_priv(expr);
524
525 if (priv->key == NFT_META_NFTRACE)
526 static_branch_dec(&nft_trace_enabled);
527 }
528 EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
529
nft_meta_get_offload(struct nft_offload_ctx * ctx,struct nft_flow_rule * flow,const struct nft_expr * expr)530 static int nft_meta_get_offload(struct nft_offload_ctx *ctx,
531 struct nft_flow_rule *flow,
532 const struct nft_expr *expr)
533 {
534 const struct nft_meta *priv = nft_expr_priv(expr);
535 struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
536
537 switch (priv->key) {
538 case NFT_META_PROTOCOL:
539 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, n_proto,
540 sizeof(__u16), reg);
541 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
542 break;
543 case NFT_META_L4PROTO:
544 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
545 sizeof(__u8), reg);
546 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
547 break;
548 default:
549 return -EOPNOTSUPP;
550 }
551
552 return 0;
553 }
554
555 static const struct nft_expr_ops nft_meta_get_ops = {
556 .type = &nft_meta_type,
557 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
558 .eval = nft_meta_get_eval,
559 .init = nft_meta_get_init,
560 .dump = nft_meta_get_dump,
561 .validate = nft_meta_get_validate,
562 .offload = nft_meta_get_offload,
563 };
564
565 static const struct nft_expr_ops nft_meta_set_ops = {
566 .type = &nft_meta_type,
567 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
568 .eval = nft_meta_set_eval,
569 .init = nft_meta_set_init,
570 .destroy = nft_meta_set_destroy,
571 .dump = nft_meta_set_dump,
572 .validate = nft_meta_set_validate,
573 };
574
575 static const struct nft_expr_ops *
nft_meta_select_ops(const struct nft_ctx * ctx,const struct nlattr * const tb[])576 nft_meta_select_ops(const struct nft_ctx *ctx,
577 const struct nlattr * const tb[])
578 {
579 if (tb[NFTA_META_KEY] == NULL)
580 return ERR_PTR(-EINVAL);
581
582 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
583 return ERR_PTR(-EINVAL);
584
585 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE) && IS_MODULE(CONFIG_NFT_BRIDGE_META)
586 if (ctx->family == NFPROTO_BRIDGE)
587 return ERR_PTR(-EAGAIN);
588 #endif
589 if (tb[NFTA_META_DREG])
590 return &nft_meta_get_ops;
591
592 if (tb[NFTA_META_SREG])
593 return &nft_meta_set_ops;
594
595 return ERR_PTR(-EINVAL);
596 }
597
598 struct nft_expr_type nft_meta_type __read_mostly = {
599 .name = "meta",
600 .select_ops = nft_meta_select_ops,
601 .policy = nft_meta_policy,
602 .maxattr = NFTA_META_MAX,
603 .owner = THIS_MODULE,
604 };
605
606 #ifdef CONFIG_NETWORK_SECMARK
607 struct nft_secmark {
608 u32 secid;
609 char *ctx;
610 };
611
612 static const struct nla_policy nft_secmark_policy[NFTA_SECMARK_MAX + 1] = {
613 [NFTA_SECMARK_CTX] = { .type = NLA_STRING, .len = NFT_SECMARK_CTX_MAXLEN },
614 };
615
nft_secmark_compute_secid(struct nft_secmark * priv)616 static int nft_secmark_compute_secid(struct nft_secmark *priv)
617 {
618 u32 tmp_secid = 0;
619 int err;
620
621 err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &tmp_secid);
622 if (err)
623 return err;
624
625 if (!tmp_secid)
626 return -ENOENT;
627
628 err = security_secmark_relabel_packet(tmp_secid);
629 if (err)
630 return err;
631
632 priv->secid = tmp_secid;
633 return 0;
634 }
635
nft_secmark_obj_eval(struct nft_object * obj,struct nft_regs * regs,const struct nft_pktinfo * pkt)636 static void nft_secmark_obj_eval(struct nft_object *obj, struct nft_regs *regs,
637 const struct nft_pktinfo *pkt)
638 {
639 const struct nft_secmark *priv = nft_obj_data(obj);
640 struct sk_buff *skb = pkt->skb;
641
642 skb->secmark = priv->secid;
643 }
644
nft_secmark_obj_init(const struct nft_ctx * ctx,const struct nlattr * const tb[],struct nft_object * obj)645 static int nft_secmark_obj_init(const struct nft_ctx *ctx,
646 const struct nlattr * const tb[],
647 struct nft_object *obj)
648 {
649 struct nft_secmark *priv = nft_obj_data(obj);
650 int err;
651
652 if (tb[NFTA_SECMARK_CTX] == NULL)
653 return -EINVAL;
654
655 priv->ctx = nla_strdup(tb[NFTA_SECMARK_CTX], GFP_KERNEL);
656 if (!priv->ctx)
657 return -ENOMEM;
658
659 err = nft_secmark_compute_secid(priv);
660 if (err) {
661 kfree(priv->ctx);
662 return err;
663 }
664
665 security_secmark_refcount_inc();
666
667 return 0;
668 }
669
nft_secmark_obj_dump(struct sk_buff * skb,struct nft_object * obj,bool reset)670 static int nft_secmark_obj_dump(struct sk_buff *skb, struct nft_object *obj,
671 bool reset)
672 {
673 struct nft_secmark *priv = nft_obj_data(obj);
674 int err;
675
676 if (nla_put_string(skb, NFTA_SECMARK_CTX, priv->ctx))
677 return -1;
678
679 if (reset) {
680 err = nft_secmark_compute_secid(priv);
681 if (err)
682 return err;
683 }
684
685 return 0;
686 }
687
nft_secmark_obj_destroy(const struct nft_ctx * ctx,struct nft_object * obj)688 static void nft_secmark_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
689 {
690 struct nft_secmark *priv = nft_obj_data(obj);
691
692 security_secmark_refcount_dec();
693
694 kfree(priv->ctx);
695 }
696
697 static const struct nft_object_ops nft_secmark_obj_ops = {
698 .type = &nft_secmark_obj_type,
699 .size = sizeof(struct nft_secmark),
700 .init = nft_secmark_obj_init,
701 .eval = nft_secmark_obj_eval,
702 .dump = nft_secmark_obj_dump,
703 .destroy = nft_secmark_obj_destroy,
704 };
705 struct nft_object_type nft_secmark_obj_type __read_mostly = {
706 .type = NFT_OBJECT_SECMARK,
707 .ops = &nft_secmark_obj_ops,
708 .maxattr = NFTA_SECMARK_MAX,
709 .policy = nft_secmark_policy,
710 .owner = THIS_MODULE,
711 };
712 #endif /* CONFIG_NETWORK_SECMARK */
713