1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
4 * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
5 *
6 * Development of this code funded by Astaro AG (http://www.astaro.com/)
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/netlink.h>
13 #include <linux/netfilter.h>
14 #include <linux/netfilter/nf_tables.h>
15 #include <net/netfilter/nf_tables.h>
16 #include <net/netfilter/nf_conntrack.h>
17 #include <net/netfilter/nf_conntrack_acct.h>
18 #include <net/netfilter/nf_conntrack_tuple.h>
19 #include <net/netfilter/nf_conntrack_helper.h>
20 #include <net/netfilter/nf_conntrack_ecache.h>
21 #include <net/netfilter/nf_conntrack_labels.h>
22 #include <net/netfilter/nf_conntrack_timeout.h>
23 #include <net/netfilter/nf_conntrack_l4proto.h>
24 #include <net/netfilter/nf_conntrack_expect.h>
25
26 struct nft_ct {
27 enum nft_ct_keys key:8;
28 enum ip_conntrack_dir dir:8;
29 union {
30 u8 dreg;
31 u8 sreg;
32 };
33 };
34
35 struct nft_ct_helper_obj {
36 struct nf_conntrack_helper *helper4;
37 struct nf_conntrack_helper *helper6;
38 u8 l4proto;
39 };
40
41 #ifdef CONFIG_NF_CONNTRACK_ZONES
42 static DEFINE_PER_CPU(struct nf_conn *, nft_ct_pcpu_template);
43 static unsigned int nft_ct_pcpu_template_refcnt __read_mostly;
44 #endif
45
nft_ct_get_eval_counter(const struct nf_conn_counter * c,enum nft_ct_keys k,enum ip_conntrack_dir d)46 static u64 nft_ct_get_eval_counter(const struct nf_conn_counter *c,
47 enum nft_ct_keys k,
48 enum ip_conntrack_dir d)
49 {
50 if (d < IP_CT_DIR_MAX)
51 return k == NFT_CT_BYTES ? atomic64_read(&c[d].bytes) :
52 atomic64_read(&c[d].packets);
53
54 return nft_ct_get_eval_counter(c, k, IP_CT_DIR_ORIGINAL) +
55 nft_ct_get_eval_counter(c, k, IP_CT_DIR_REPLY);
56 }
57
nft_ct_get_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)58 static void nft_ct_get_eval(const struct nft_expr *expr,
59 struct nft_regs *regs,
60 const struct nft_pktinfo *pkt)
61 {
62 const struct nft_ct *priv = nft_expr_priv(expr);
63 u32 *dest = ®s->data[priv->dreg];
64 enum ip_conntrack_info ctinfo;
65 const struct nf_conn *ct;
66 const struct nf_conn_help *help;
67 const struct nf_conntrack_tuple *tuple;
68 const struct nf_conntrack_helper *helper;
69 unsigned int state;
70
71 ct = nf_ct_get(pkt->skb, &ctinfo);
72
73 switch (priv->key) {
74 case NFT_CT_STATE:
75 if (ct)
76 state = NF_CT_STATE_BIT(ctinfo);
77 else if (ctinfo == IP_CT_UNTRACKED)
78 state = NF_CT_STATE_UNTRACKED_BIT;
79 else
80 state = NF_CT_STATE_INVALID_BIT;
81 *dest = state;
82 return;
83 default:
84 break;
85 }
86
87 if (ct == NULL)
88 goto err;
89
90 switch (priv->key) {
91 case NFT_CT_DIRECTION:
92 nft_reg_store8(dest, CTINFO2DIR(ctinfo));
93 return;
94 case NFT_CT_STATUS:
95 *dest = ct->status;
96 return;
97 #ifdef CONFIG_NF_CONNTRACK_MARK
98 case NFT_CT_MARK:
99 *dest = ct->mark;
100 return;
101 #endif
102 #ifdef CONFIG_NF_CONNTRACK_SECMARK
103 case NFT_CT_SECMARK:
104 *dest = ct->secmark;
105 return;
106 #endif
107 case NFT_CT_EXPIRATION:
108 *dest = jiffies_to_msecs(nf_ct_expires(ct));
109 return;
110 case NFT_CT_HELPER:
111 if (ct->master == NULL)
112 goto err;
113 help = nfct_help(ct->master);
114 if (help == NULL)
115 goto err;
116 helper = rcu_dereference(help->helper);
117 if (helper == NULL)
118 goto err;
119 strncpy((char *)dest, helper->name, NF_CT_HELPER_NAME_LEN);
120 return;
121 #ifdef CONFIG_NF_CONNTRACK_LABELS
122 case NFT_CT_LABELS: {
123 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
124
125 if (labels)
126 memcpy(dest, labels->bits, NF_CT_LABELS_MAX_SIZE);
127 else
128 memset(dest, 0, NF_CT_LABELS_MAX_SIZE);
129 return;
130 }
131 #endif
132 case NFT_CT_BYTES: /* fallthrough */
133 case NFT_CT_PKTS: {
134 const struct nf_conn_acct *acct = nf_conn_acct_find(ct);
135 u64 count = 0;
136
137 if (acct)
138 count = nft_ct_get_eval_counter(acct->counter,
139 priv->key, priv->dir);
140 memcpy(dest, &count, sizeof(count));
141 return;
142 }
143 case NFT_CT_AVGPKT: {
144 const struct nf_conn_acct *acct = nf_conn_acct_find(ct);
145 u64 avgcnt = 0, bcnt = 0, pcnt = 0;
146
147 if (acct) {
148 pcnt = nft_ct_get_eval_counter(acct->counter,
149 NFT_CT_PKTS, priv->dir);
150 bcnt = nft_ct_get_eval_counter(acct->counter,
151 NFT_CT_BYTES, priv->dir);
152 if (pcnt != 0)
153 avgcnt = div64_u64(bcnt, pcnt);
154 }
155
156 memcpy(dest, &avgcnt, sizeof(avgcnt));
157 return;
158 }
159 case NFT_CT_L3PROTOCOL:
160 nft_reg_store8(dest, nf_ct_l3num(ct));
161 return;
162 case NFT_CT_PROTOCOL:
163 nft_reg_store8(dest, nf_ct_protonum(ct));
164 return;
165 #ifdef CONFIG_NF_CONNTRACK_ZONES
166 case NFT_CT_ZONE: {
167 const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
168 u16 zoneid;
169
170 if (priv->dir < IP_CT_DIR_MAX)
171 zoneid = nf_ct_zone_id(zone, priv->dir);
172 else
173 zoneid = zone->id;
174
175 nft_reg_store16(dest, zoneid);
176 return;
177 }
178 #endif
179 case NFT_CT_ID:
180 *dest = nf_ct_get_id(ct);
181 return;
182 default:
183 break;
184 }
185
186 tuple = &ct->tuplehash[priv->dir].tuple;
187 switch (priv->key) {
188 case NFT_CT_SRC:
189 memcpy(dest, tuple->src.u3.all,
190 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
191 return;
192 case NFT_CT_DST:
193 memcpy(dest, tuple->dst.u3.all,
194 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
195 return;
196 case NFT_CT_PROTO_SRC:
197 nft_reg_store16(dest, (__force u16)tuple->src.u.all);
198 return;
199 case NFT_CT_PROTO_DST:
200 nft_reg_store16(dest, (__force u16)tuple->dst.u.all);
201 return;
202 case NFT_CT_SRC_IP:
203 if (nf_ct_l3num(ct) != NFPROTO_IPV4)
204 goto err;
205 *dest = tuple->src.u3.ip;
206 return;
207 case NFT_CT_DST_IP:
208 if (nf_ct_l3num(ct) != NFPROTO_IPV4)
209 goto err;
210 *dest = tuple->dst.u3.ip;
211 return;
212 case NFT_CT_SRC_IP6:
213 if (nf_ct_l3num(ct) != NFPROTO_IPV6)
214 goto err;
215 memcpy(dest, tuple->src.u3.ip6, sizeof(struct in6_addr));
216 return;
217 case NFT_CT_DST_IP6:
218 if (nf_ct_l3num(ct) != NFPROTO_IPV6)
219 goto err;
220 memcpy(dest, tuple->dst.u3.ip6, sizeof(struct in6_addr));
221 return;
222 default:
223 break;
224 }
225 return;
226 err:
227 regs->verdict.code = NFT_BREAK;
228 }
229
230 #ifdef CONFIG_NF_CONNTRACK_ZONES
nft_ct_set_zone_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)231 static void nft_ct_set_zone_eval(const struct nft_expr *expr,
232 struct nft_regs *regs,
233 const struct nft_pktinfo *pkt)
234 {
235 struct nf_conntrack_zone zone = { .dir = NF_CT_DEFAULT_ZONE_DIR };
236 const struct nft_ct *priv = nft_expr_priv(expr);
237 struct sk_buff *skb = pkt->skb;
238 enum ip_conntrack_info ctinfo;
239 u16 value = nft_reg_load16(®s->data[priv->sreg]);
240 struct nf_conn *ct;
241
242 ct = nf_ct_get(skb, &ctinfo);
243 if (ct) /* already tracked */
244 return;
245
246 zone.id = value;
247
248 switch (priv->dir) {
249 case IP_CT_DIR_ORIGINAL:
250 zone.dir = NF_CT_ZONE_DIR_ORIG;
251 break;
252 case IP_CT_DIR_REPLY:
253 zone.dir = NF_CT_ZONE_DIR_REPL;
254 break;
255 default:
256 break;
257 }
258
259 ct = this_cpu_read(nft_ct_pcpu_template);
260
261 if (likely(atomic_read(&ct->ct_general.use) == 1)) {
262 nf_ct_zone_add(ct, &zone);
263 } else {
264 /* previous skb got queued to userspace */
265 ct = nf_ct_tmpl_alloc(nft_net(pkt), &zone, GFP_ATOMIC);
266 if (!ct) {
267 regs->verdict.code = NF_DROP;
268 return;
269 }
270 }
271
272 atomic_inc(&ct->ct_general.use);
273 nf_ct_set(skb, ct, IP_CT_NEW);
274 }
275 #endif
276
nft_ct_set_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)277 static void nft_ct_set_eval(const struct nft_expr *expr,
278 struct nft_regs *regs,
279 const struct nft_pktinfo *pkt)
280 {
281 const struct nft_ct *priv = nft_expr_priv(expr);
282 struct sk_buff *skb = pkt->skb;
283 #if defined(CONFIG_NF_CONNTRACK_MARK) || defined(CONFIG_NF_CONNTRACK_SECMARK)
284 u32 value = regs->data[priv->sreg];
285 #endif
286 enum ip_conntrack_info ctinfo;
287 struct nf_conn *ct;
288
289 ct = nf_ct_get(skb, &ctinfo);
290 if (ct == NULL || nf_ct_is_template(ct))
291 return;
292
293 switch (priv->key) {
294 #ifdef CONFIG_NF_CONNTRACK_MARK
295 case NFT_CT_MARK:
296 if (ct->mark != value) {
297 ct->mark = value;
298 nf_conntrack_event_cache(IPCT_MARK, ct);
299 }
300 break;
301 #endif
302 #ifdef CONFIG_NF_CONNTRACK_SECMARK
303 case NFT_CT_SECMARK:
304 if (ct->secmark != value) {
305 ct->secmark = value;
306 nf_conntrack_event_cache(IPCT_SECMARK, ct);
307 }
308 break;
309 #endif
310 #ifdef CONFIG_NF_CONNTRACK_LABELS
311 case NFT_CT_LABELS:
312 nf_connlabels_replace(ct,
313 ®s->data[priv->sreg],
314 ®s->data[priv->sreg],
315 NF_CT_LABELS_MAX_SIZE / sizeof(u32));
316 break;
317 #endif
318 #ifdef CONFIG_NF_CONNTRACK_EVENTS
319 case NFT_CT_EVENTMASK: {
320 struct nf_conntrack_ecache *e = nf_ct_ecache_find(ct);
321 u32 ctmask = regs->data[priv->sreg];
322
323 if (e) {
324 if (e->ctmask != ctmask)
325 e->ctmask = ctmask;
326 break;
327 }
328
329 if (ctmask && !nf_ct_is_confirmed(ct))
330 nf_ct_ecache_ext_add(ct, ctmask, 0, GFP_ATOMIC);
331 break;
332 }
333 #endif
334 default:
335 break;
336 }
337 }
338
339 static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
340 [NFTA_CT_DREG] = { .type = NLA_U32 },
341 [NFTA_CT_KEY] = { .type = NLA_U32 },
342 [NFTA_CT_DIRECTION] = { .type = NLA_U8 },
343 [NFTA_CT_SREG] = { .type = NLA_U32 },
344 };
345
346 #ifdef CONFIG_NF_CONNTRACK_ZONES
nft_ct_tmpl_put_pcpu(void)347 static void nft_ct_tmpl_put_pcpu(void)
348 {
349 struct nf_conn *ct;
350 int cpu;
351
352 for_each_possible_cpu(cpu) {
353 ct = per_cpu(nft_ct_pcpu_template, cpu);
354 if (!ct)
355 break;
356 nf_ct_put(ct);
357 per_cpu(nft_ct_pcpu_template, cpu) = NULL;
358 }
359 }
360
nft_ct_tmpl_alloc_pcpu(void)361 static bool nft_ct_tmpl_alloc_pcpu(void)
362 {
363 struct nf_conntrack_zone zone = { .id = 0 };
364 struct nf_conn *tmp;
365 int cpu;
366
367 if (nft_ct_pcpu_template_refcnt)
368 return true;
369
370 for_each_possible_cpu(cpu) {
371 tmp = nf_ct_tmpl_alloc(&init_net, &zone, GFP_KERNEL);
372 if (!tmp) {
373 nft_ct_tmpl_put_pcpu();
374 return false;
375 }
376
377 atomic_set(&tmp->ct_general.use, 1);
378 per_cpu(nft_ct_pcpu_template, cpu) = tmp;
379 }
380
381 return true;
382 }
383 #endif
384
nft_ct_get_init(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nlattr * const tb[])385 static int nft_ct_get_init(const struct nft_ctx *ctx,
386 const struct nft_expr *expr,
387 const struct nlattr * const tb[])
388 {
389 struct nft_ct *priv = nft_expr_priv(expr);
390 unsigned int len;
391 int err;
392
393 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
394 priv->dir = IP_CT_DIR_MAX;
395 switch (priv->key) {
396 case NFT_CT_DIRECTION:
397 if (tb[NFTA_CT_DIRECTION] != NULL)
398 return -EINVAL;
399 len = sizeof(u8);
400 break;
401 case NFT_CT_STATE:
402 case NFT_CT_STATUS:
403 #ifdef CONFIG_NF_CONNTRACK_MARK
404 case NFT_CT_MARK:
405 #endif
406 #ifdef CONFIG_NF_CONNTRACK_SECMARK
407 case NFT_CT_SECMARK:
408 #endif
409 case NFT_CT_EXPIRATION:
410 if (tb[NFTA_CT_DIRECTION] != NULL)
411 return -EINVAL;
412 len = sizeof(u32);
413 break;
414 #ifdef CONFIG_NF_CONNTRACK_LABELS
415 case NFT_CT_LABELS:
416 if (tb[NFTA_CT_DIRECTION] != NULL)
417 return -EINVAL;
418 len = NF_CT_LABELS_MAX_SIZE;
419 break;
420 #endif
421 case NFT_CT_HELPER:
422 if (tb[NFTA_CT_DIRECTION] != NULL)
423 return -EINVAL;
424 len = NF_CT_HELPER_NAME_LEN;
425 break;
426
427 case NFT_CT_L3PROTOCOL:
428 case NFT_CT_PROTOCOL:
429 /* For compatibility, do not report error if NFTA_CT_DIRECTION
430 * attribute is specified.
431 */
432 len = sizeof(u8);
433 break;
434 case NFT_CT_SRC:
435 case NFT_CT_DST:
436 if (tb[NFTA_CT_DIRECTION] == NULL)
437 return -EINVAL;
438
439 switch (ctx->family) {
440 case NFPROTO_IPV4:
441 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
442 src.u3.ip);
443 break;
444 case NFPROTO_IPV6:
445 case NFPROTO_INET:
446 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
447 src.u3.ip6);
448 break;
449 default:
450 return -EAFNOSUPPORT;
451 }
452 break;
453 case NFT_CT_SRC_IP:
454 case NFT_CT_DST_IP:
455 if (tb[NFTA_CT_DIRECTION] == NULL)
456 return -EINVAL;
457
458 len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u3.ip);
459 break;
460 case NFT_CT_SRC_IP6:
461 case NFT_CT_DST_IP6:
462 if (tb[NFTA_CT_DIRECTION] == NULL)
463 return -EINVAL;
464
465 len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u3.ip6);
466 break;
467 case NFT_CT_PROTO_SRC:
468 case NFT_CT_PROTO_DST:
469 if (tb[NFTA_CT_DIRECTION] == NULL)
470 return -EINVAL;
471 len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u.all);
472 break;
473 case NFT_CT_BYTES:
474 case NFT_CT_PKTS:
475 case NFT_CT_AVGPKT:
476 len = sizeof(u64);
477 break;
478 #ifdef CONFIG_NF_CONNTRACK_ZONES
479 case NFT_CT_ZONE:
480 len = sizeof(u16);
481 break;
482 #endif
483 case NFT_CT_ID:
484 if (tb[NFTA_CT_DIRECTION])
485 return -EINVAL;
486
487 len = sizeof(u32);
488 break;
489 default:
490 return -EOPNOTSUPP;
491 }
492
493 if (tb[NFTA_CT_DIRECTION] != NULL) {
494 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
495 switch (priv->dir) {
496 case IP_CT_DIR_ORIGINAL:
497 case IP_CT_DIR_REPLY:
498 break;
499 default:
500 return -EINVAL;
501 }
502 }
503
504 err = nft_parse_register_store(ctx, tb[NFTA_CT_DREG], &priv->dreg, NULL,
505 NFT_DATA_VALUE, len);
506 if (err < 0)
507 return err;
508
509 err = nf_ct_netns_get(ctx->net, ctx->family);
510 if (err < 0)
511 return err;
512
513 if (priv->key == NFT_CT_BYTES ||
514 priv->key == NFT_CT_PKTS ||
515 priv->key == NFT_CT_AVGPKT)
516 nf_ct_set_acct(ctx->net, true);
517
518 return 0;
519 }
520
__nft_ct_set_destroy(const struct nft_ctx * ctx,struct nft_ct * priv)521 static void __nft_ct_set_destroy(const struct nft_ctx *ctx, struct nft_ct *priv)
522 {
523 switch (priv->key) {
524 #ifdef CONFIG_NF_CONNTRACK_LABELS
525 case NFT_CT_LABELS:
526 nf_connlabels_put(ctx->net);
527 break;
528 #endif
529 #ifdef CONFIG_NF_CONNTRACK_ZONES
530 case NFT_CT_ZONE:
531 if (--nft_ct_pcpu_template_refcnt == 0)
532 nft_ct_tmpl_put_pcpu();
533 #endif
534 default:
535 break;
536 }
537 }
538
nft_ct_set_init(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nlattr * const tb[])539 static int nft_ct_set_init(const struct nft_ctx *ctx,
540 const struct nft_expr *expr,
541 const struct nlattr * const tb[])
542 {
543 struct nft_ct *priv = nft_expr_priv(expr);
544 unsigned int len;
545 int err;
546
547 priv->dir = IP_CT_DIR_MAX;
548 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
549 switch (priv->key) {
550 #ifdef CONFIG_NF_CONNTRACK_MARK
551 case NFT_CT_MARK:
552 if (tb[NFTA_CT_DIRECTION])
553 return -EINVAL;
554 len = FIELD_SIZEOF(struct nf_conn, mark);
555 break;
556 #endif
557 #ifdef CONFIG_NF_CONNTRACK_LABELS
558 case NFT_CT_LABELS:
559 if (tb[NFTA_CT_DIRECTION])
560 return -EINVAL;
561 len = NF_CT_LABELS_MAX_SIZE;
562 err = nf_connlabels_get(ctx->net, (len * BITS_PER_BYTE) - 1);
563 if (err)
564 return err;
565 break;
566 #endif
567 #ifdef CONFIG_NF_CONNTRACK_ZONES
568 case NFT_CT_ZONE:
569 if (!nft_ct_tmpl_alloc_pcpu())
570 return -ENOMEM;
571 nft_ct_pcpu_template_refcnt++;
572 len = sizeof(u16);
573 break;
574 #endif
575 #ifdef CONFIG_NF_CONNTRACK_EVENTS
576 case NFT_CT_EVENTMASK:
577 if (tb[NFTA_CT_DIRECTION])
578 return -EINVAL;
579 len = sizeof(u32);
580 break;
581 #endif
582 #ifdef CONFIG_NF_CONNTRACK_SECMARK
583 case NFT_CT_SECMARK:
584 if (tb[NFTA_CT_DIRECTION])
585 return -EINVAL;
586 len = sizeof(u32);
587 break;
588 #endif
589 default:
590 return -EOPNOTSUPP;
591 }
592
593 if (tb[NFTA_CT_DIRECTION]) {
594 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
595 switch (priv->dir) {
596 case IP_CT_DIR_ORIGINAL:
597 case IP_CT_DIR_REPLY:
598 break;
599 default:
600 err = -EINVAL;
601 goto err1;
602 }
603 }
604
605 err = nft_parse_register_load(tb[NFTA_CT_SREG], &priv->sreg, len);
606 if (err < 0)
607 goto err1;
608
609 err = nf_ct_netns_get(ctx->net, ctx->family);
610 if (err < 0)
611 goto err1;
612
613 return 0;
614
615 err1:
616 __nft_ct_set_destroy(ctx, priv);
617 return err;
618 }
619
nft_ct_get_destroy(const struct nft_ctx * ctx,const struct nft_expr * expr)620 static void nft_ct_get_destroy(const struct nft_ctx *ctx,
621 const struct nft_expr *expr)
622 {
623 nf_ct_netns_put(ctx->net, ctx->family);
624 }
625
nft_ct_set_destroy(const struct nft_ctx * ctx,const struct nft_expr * expr)626 static void nft_ct_set_destroy(const struct nft_ctx *ctx,
627 const struct nft_expr *expr)
628 {
629 struct nft_ct *priv = nft_expr_priv(expr);
630
631 __nft_ct_set_destroy(ctx, priv);
632 nf_ct_netns_put(ctx->net, ctx->family);
633 }
634
nft_ct_get_dump(struct sk_buff * skb,const struct nft_expr * expr)635 static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
636 {
637 const struct nft_ct *priv = nft_expr_priv(expr);
638
639 if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg))
640 goto nla_put_failure;
641 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
642 goto nla_put_failure;
643
644 switch (priv->key) {
645 case NFT_CT_SRC:
646 case NFT_CT_DST:
647 case NFT_CT_SRC_IP:
648 case NFT_CT_DST_IP:
649 case NFT_CT_SRC_IP6:
650 case NFT_CT_DST_IP6:
651 case NFT_CT_PROTO_SRC:
652 case NFT_CT_PROTO_DST:
653 if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
654 goto nla_put_failure;
655 break;
656 case NFT_CT_BYTES:
657 case NFT_CT_PKTS:
658 case NFT_CT_AVGPKT:
659 case NFT_CT_ZONE:
660 if (priv->dir < IP_CT_DIR_MAX &&
661 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
662 goto nla_put_failure;
663 break;
664 default:
665 break;
666 }
667
668 return 0;
669
670 nla_put_failure:
671 return -1;
672 }
673
nft_ct_set_dump(struct sk_buff * skb,const struct nft_expr * expr)674 static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
675 {
676 const struct nft_ct *priv = nft_expr_priv(expr);
677
678 if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg))
679 goto nla_put_failure;
680 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
681 goto nla_put_failure;
682
683 switch (priv->key) {
684 case NFT_CT_ZONE:
685 if (priv->dir < IP_CT_DIR_MAX &&
686 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
687 goto nla_put_failure;
688 break;
689 default:
690 break;
691 }
692
693 return 0;
694
695 nla_put_failure:
696 return -1;
697 }
698
699 static struct nft_expr_type nft_ct_type;
700 static const struct nft_expr_ops nft_ct_get_ops = {
701 .type = &nft_ct_type,
702 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
703 .eval = nft_ct_get_eval,
704 .init = nft_ct_get_init,
705 .destroy = nft_ct_get_destroy,
706 .dump = nft_ct_get_dump,
707 };
708
709 static const struct nft_expr_ops nft_ct_set_ops = {
710 .type = &nft_ct_type,
711 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
712 .eval = nft_ct_set_eval,
713 .init = nft_ct_set_init,
714 .destroy = nft_ct_set_destroy,
715 .dump = nft_ct_set_dump,
716 };
717
718 #ifdef CONFIG_NF_CONNTRACK_ZONES
719 static const struct nft_expr_ops nft_ct_set_zone_ops = {
720 .type = &nft_ct_type,
721 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
722 .eval = nft_ct_set_zone_eval,
723 .init = nft_ct_set_init,
724 .destroy = nft_ct_set_destroy,
725 .dump = nft_ct_set_dump,
726 };
727 #endif
728
729 static const struct nft_expr_ops *
nft_ct_select_ops(const struct nft_ctx * ctx,const struct nlattr * const tb[])730 nft_ct_select_ops(const struct nft_ctx *ctx,
731 const struct nlattr * const tb[])
732 {
733 if (tb[NFTA_CT_KEY] == NULL)
734 return ERR_PTR(-EINVAL);
735
736 if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG])
737 return ERR_PTR(-EINVAL);
738
739 if (tb[NFTA_CT_DREG])
740 return &nft_ct_get_ops;
741
742 if (tb[NFTA_CT_SREG]) {
743 #ifdef CONFIG_NF_CONNTRACK_ZONES
744 if (nla_get_be32(tb[NFTA_CT_KEY]) == htonl(NFT_CT_ZONE))
745 return &nft_ct_set_zone_ops;
746 #endif
747 return &nft_ct_set_ops;
748 }
749
750 return ERR_PTR(-EINVAL);
751 }
752
753 static struct nft_expr_type nft_ct_type __read_mostly = {
754 .name = "ct",
755 .select_ops = nft_ct_select_ops,
756 .policy = nft_ct_policy,
757 .maxattr = NFTA_CT_MAX,
758 .owner = THIS_MODULE,
759 };
760
nft_notrack_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)761 static void nft_notrack_eval(const struct nft_expr *expr,
762 struct nft_regs *regs,
763 const struct nft_pktinfo *pkt)
764 {
765 struct sk_buff *skb = pkt->skb;
766 enum ip_conntrack_info ctinfo;
767 struct nf_conn *ct;
768
769 ct = nf_ct_get(pkt->skb, &ctinfo);
770 /* Previously seen (loopback or untracked)? Ignore. */
771 if (ct || ctinfo == IP_CT_UNTRACKED)
772 return;
773
774 nf_ct_set(skb, ct, IP_CT_UNTRACKED);
775 }
776
777 static struct nft_expr_type nft_notrack_type;
778 static const struct nft_expr_ops nft_notrack_ops = {
779 .type = &nft_notrack_type,
780 .size = NFT_EXPR_SIZE(0),
781 .eval = nft_notrack_eval,
782 };
783
784 static struct nft_expr_type nft_notrack_type __read_mostly = {
785 .name = "notrack",
786 .ops = &nft_notrack_ops,
787 .owner = THIS_MODULE,
788 };
789
790 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
791 static int
nft_ct_timeout_parse_policy(void * timeouts,const struct nf_conntrack_l4proto * l4proto,struct net * net,const struct nlattr * attr)792 nft_ct_timeout_parse_policy(void *timeouts,
793 const struct nf_conntrack_l4proto *l4proto,
794 struct net *net, const struct nlattr *attr)
795 {
796 struct nlattr **tb;
797 int ret = 0;
798
799 tb = kcalloc(l4proto->ctnl_timeout.nlattr_max + 1, sizeof(*tb),
800 GFP_KERNEL);
801
802 if (!tb)
803 return -ENOMEM;
804
805 ret = nla_parse_nested_deprecated(tb,
806 l4proto->ctnl_timeout.nlattr_max,
807 attr,
808 l4proto->ctnl_timeout.nla_policy,
809 NULL);
810 if (ret < 0)
811 goto err;
812
813 ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts);
814
815 err:
816 kfree(tb);
817 return ret;
818 }
819
820 struct nft_ct_timeout_obj {
821 struct nf_ct_timeout *timeout;
822 u8 l4proto;
823 };
824
nft_ct_timeout_obj_eval(struct nft_object * obj,struct nft_regs * regs,const struct nft_pktinfo * pkt)825 static void nft_ct_timeout_obj_eval(struct nft_object *obj,
826 struct nft_regs *regs,
827 const struct nft_pktinfo *pkt)
828 {
829 const struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
830 struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb);
831 struct nf_conn_timeout *timeout;
832 const unsigned int *values;
833
834 if (priv->l4proto != pkt->tprot)
835 return;
836
837 if (!ct || nf_ct_is_template(ct) || nf_ct_is_confirmed(ct))
838 return;
839
840 timeout = nf_ct_timeout_find(ct);
841 if (!timeout) {
842 timeout = nf_ct_timeout_ext_add(ct, priv->timeout, GFP_ATOMIC);
843 if (!timeout) {
844 regs->verdict.code = NF_DROP;
845 return;
846 }
847 }
848
849 rcu_assign_pointer(timeout->timeout, priv->timeout);
850
851 /* adjust the timeout as per 'new' state. ct is unconfirmed,
852 * so the current timestamp must not be added.
853 */
854 values = nf_ct_timeout_data(timeout);
855 if (values)
856 nf_ct_refresh(ct, pkt->skb, values[0]);
857 }
858
nft_ct_timeout_obj_init(const struct nft_ctx * ctx,const struct nlattr * const tb[],struct nft_object * obj)859 static int nft_ct_timeout_obj_init(const struct nft_ctx *ctx,
860 const struct nlattr * const tb[],
861 struct nft_object *obj)
862 {
863 struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
864 const struct nf_conntrack_l4proto *l4proto;
865 struct nf_ct_timeout *timeout;
866 int l3num = ctx->family;
867 __u8 l4num;
868 int ret;
869
870 if (!tb[NFTA_CT_TIMEOUT_L4PROTO] ||
871 !tb[NFTA_CT_TIMEOUT_DATA])
872 return -EINVAL;
873
874 if (tb[NFTA_CT_TIMEOUT_L3PROTO])
875 l3num = ntohs(nla_get_be16(tb[NFTA_CT_TIMEOUT_L3PROTO]));
876
877 l4num = nla_get_u8(tb[NFTA_CT_TIMEOUT_L4PROTO]);
878 priv->l4proto = l4num;
879
880 l4proto = nf_ct_l4proto_find(l4num);
881
882 if (l4proto->l4proto != l4num) {
883 ret = -EOPNOTSUPP;
884 goto err_proto_put;
885 }
886
887 timeout = kzalloc(sizeof(struct nf_ct_timeout) +
888 l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
889 if (timeout == NULL) {
890 ret = -ENOMEM;
891 goto err_proto_put;
892 }
893
894 ret = nft_ct_timeout_parse_policy(&timeout->data, l4proto, ctx->net,
895 tb[NFTA_CT_TIMEOUT_DATA]);
896 if (ret < 0)
897 goto err_free_timeout;
898
899 timeout->l3num = l3num;
900 timeout->l4proto = l4proto;
901
902 ret = nf_ct_netns_get(ctx->net, ctx->family);
903 if (ret < 0)
904 goto err_free_timeout;
905
906 priv->timeout = timeout;
907 return 0;
908
909 err_free_timeout:
910 kfree(timeout);
911 err_proto_put:
912 return ret;
913 }
914
nft_ct_timeout_obj_destroy(const struct nft_ctx * ctx,struct nft_object * obj)915 static void nft_ct_timeout_obj_destroy(const struct nft_ctx *ctx,
916 struct nft_object *obj)
917 {
918 struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
919 struct nf_ct_timeout *timeout = priv->timeout;
920
921 nf_ct_untimeout(ctx->net, timeout);
922 nf_ct_netns_put(ctx->net, ctx->family);
923 kfree(priv->timeout);
924 }
925
nft_ct_timeout_obj_dump(struct sk_buff * skb,struct nft_object * obj,bool reset)926 static int nft_ct_timeout_obj_dump(struct sk_buff *skb,
927 struct nft_object *obj, bool reset)
928 {
929 const struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
930 const struct nf_ct_timeout *timeout = priv->timeout;
931 struct nlattr *nest_params;
932 int ret;
933
934 if (nla_put_u8(skb, NFTA_CT_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) ||
935 nla_put_be16(skb, NFTA_CT_TIMEOUT_L3PROTO, htons(timeout->l3num)))
936 return -1;
937
938 nest_params = nla_nest_start(skb, NFTA_CT_TIMEOUT_DATA);
939 if (!nest_params)
940 return -1;
941
942 ret = timeout->l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data);
943 if (ret < 0)
944 return -1;
945 nla_nest_end(skb, nest_params);
946 return 0;
947 }
948
949 static const struct nla_policy nft_ct_timeout_policy[NFTA_CT_TIMEOUT_MAX + 1] = {
950 [NFTA_CT_TIMEOUT_L3PROTO] = {.type = NLA_U16 },
951 [NFTA_CT_TIMEOUT_L4PROTO] = {.type = NLA_U8 },
952 [NFTA_CT_TIMEOUT_DATA] = {.type = NLA_NESTED },
953 };
954
955 static struct nft_object_type nft_ct_timeout_obj_type;
956
957 static const struct nft_object_ops nft_ct_timeout_obj_ops = {
958 .type = &nft_ct_timeout_obj_type,
959 .size = sizeof(struct nft_ct_timeout_obj),
960 .eval = nft_ct_timeout_obj_eval,
961 .init = nft_ct_timeout_obj_init,
962 .destroy = nft_ct_timeout_obj_destroy,
963 .dump = nft_ct_timeout_obj_dump,
964 };
965
966 static struct nft_object_type nft_ct_timeout_obj_type __read_mostly = {
967 .type = NFT_OBJECT_CT_TIMEOUT,
968 .ops = &nft_ct_timeout_obj_ops,
969 .maxattr = NFTA_CT_TIMEOUT_MAX,
970 .policy = nft_ct_timeout_policy,
971 .owner = THIS_MODULE,
972 };
973 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
974
nft_ct_helper_obj_init(const struct nft_ctx * ctx,const struct nlattr * const tb[],struct nft_object * obj)975 static int nft_ct_helper_obj_init(const struct nft_ctx *ctx,
976 const struct nlattr * const tb[],
977 struct nft_object *obj)
978 {
979 struct nft_ct_helper_obj *priv = nft_obj_data(obj);
980 struct nf_conntrack_helper *help4, *help6;
981 char name[NF_CT_HELPER_NAME_LEN];
982 int family = ctx->family;
983 int err;
984
985 if (!tb[NFTA_CT_HELPER_NAME] || !tb[NFTA_CT_HELPER_L4PROTO])
986 return -EINVAL;
987
988 priv->l4proto = nla_get_u8(tb[NFTA_CT_HELPER_L4PROTO]);
989 if (!priv->l4proto)
990 return -ENOENT;
991
992 nla_strlcpy(name, tb[NFTA_CT_HELPER_NAME], sizeof(name));
993
994 if (tb[NFTA_CT_HELPER_L3PROTO])
995 family = ntohs(nla_get_be16(tb[NFTA_CT_HELPER_L3PROTO]));
996
997 help4 = NULL;
998 help6 = NULL;
999
1000 switch (family) {
1001 case NFPROTO_IPV4:
1002 if (ctx->family == NFPROTO_IPV6)
1003 return -EINVAL;
1004
1005 help4 = nf_conntrack_helper_try_module_get(name, family,
1006 priv->l4proto);
1007 break;
1008 case NFPROTO_IPV6:
1009 if (ctx->family == NFPROTO_IPV4)
1010 return -EINVAL;
1011
1012 help6 = nf_conntrack_helper_try_module_get(name, family,
1013 priv->l4proto);
1014 break;
1015 case NFPROTO_NETDEV: /* fallthrough */
1016 case NFPROTO_BRIDGE: /* same */
1017 case NFPROTO_INET:
1018 help4 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV4,
1019 priv->l4proto);
1020 help6 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV6,
1021 priv->l4proto);
1022 break;
1023 default:
1024 return -EAFNOSUPPORT;
1025 }
1026
1027 /* && is intentional; only error if INET found neither ipv4 or ipv6 */
1028 if (!help4 && !help6)
1029 return -ENOENT;
1030
1031 priv->helper4 = help4;
1032 priv->helper6 = help6;
1033
1034 err = nf_ct_netns_get(ctx->net, ctx->family);
1035 if (err < 0)
1036 goto err_put_helper;
1037
1038 return 0;
1039
1040 err_put_helper:
1041 if (priv->helper4)
1042 nf_conntrack_helper_put(priv->helper4);
1043 if (priv->helper6)
1044 nf_conntrack_helper_put(priv->helper6);
1045 return err;
1046 }
1047
nft_ct_helper_obj_destroy(const struct nft_ctx * ctx,struct nft_object * obj)1048 static void nft_ct_helper_obj_destroy(const struct nft_ctx *ctx,
1049 struct nft_object *obj)
1050 {
1051 struct nft_ct_helper_obj *priv = nft_obj_data(obj);
1052
1053 if (priv->helper4)
1054 nf_conntrack_helper_put(priv->helper4);
1055 if (priv->helper6)
1056 nf_conntrack_helper_put(priv->helper6);
1057
1058 nf_ct_netns_put(ctx->net, ctx->family);
1059 }
1060
nft_ct_helper_obj_eval(struct nft_object * obj,struct nft_regs * regs,const struct nft_pktinfo * pkt)1061 static void nft_ct_helper_obj_eval(struct nft_object *obj,
1062 struct nft_regs *regs,
1063 const struct nft_pktinfo *pkt)
1064 {
1065 const struct nft_ct_helper_obj *priv = nft_obj_data(obj);
1066 struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb);
1067 struct nf_conntrack_helper *to_assign = NULL;
1068 struct nf_conn_help *help;
1069
1070 if (!ct ||
1071 nf_ct_is_confirmed(ct) ||
1072 nf_ct_is_template(ct) ||
1073 priv->l4proto != nf_ct_protonum(ct))
1074 return;
1075
1076 switch (nf_ct_l3num(ct)) {
1077 case NFPROTO_IPV4:
1078 to_assign = priv->helper4;
1079 break;
1080 case NFPROTO_IPV6:
1081 to_assign = priv->helper6;
1082 break;
1083 default:
1084 WARN_ON_ONCE(1);
1085 return;
1086 }
1087
1088 if (!to_assign)
1089 return;
1090
1091 if (test_bit(IPS_HELPER_BIT, &ct->status))
1092 return;
1093
1094 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1095 if (help) {
1096 rcu_assign_pointer(help->helper, to_assign);
1097 set_bit(IPS_HELPER_BIT, &ct->status);
1098 }
1099 }
1100
nft_ct_helper_obj_dump(struct sk_buff * skb,struct nft_object * obj,bool reset)1101 static int nft_ct_helper_obj_dump(struct sk_buff *skb,
1102 struct nft_object *obj, bool reset)
1103 {
1104 const struct nft_ct_helper_obj *priv = nft_obj_data(obj);
1105 const struct nf_conntrack_helper *helper;
1106 u16 family;
1107
1108 if (priv->helper4 && priv->helper6) {
1109 family = NFPROTO_INET;
1110 helper = priv->helper4;
1111 } else if (priv->helper6) {
1112 family = NFPROTO_IPV6;
1113 helper = priv->helper6;
1114 } else {
1115 family = NFPROTO_IPV4;
1116 helper = priv->helper4;
1117 }
1118
1119 if (nla_put_string(skb, NFTA_CT_HELPER_NAME, helper->name))
1120 return -1;
1121
1122 if (nla_put_u8(skb, NFTA_CT_HELPER_L4PROTO, priv->l4proto))
1123 return -1;
1124
1125 if (nla_put_be16(skb, NFTA_CT_HELPER_L3PROTO, htons(family)))
1126 return -1;
1127
1128 return 0;
1129 }
1130
1131 static const struct nla_policy nft_ct_helper_policy[NFTA_CT_HELPER_MAX + 1] = {
1132 [NFTA_CT_HELPER_NAME] = { .type = NLA_STRING,
1133 .len = NF_CT_HELPER_NAME_LEN - 1 },
1134 [NFTA_CT_HELPER_L3PROTO] = { .type = NLA_U16 },
1135 [NFTA_CT_HELPER_L4PROTO] = { .type = NLA_U8 },
1136 };
1137
1138 static struct nft_object_type nft_ct_helper_obj_type;
1139 static const struct nft_object_ops nft_ct_helper_obj_ops = {
1140 .type = &nft_ct_helper_obj_type,
1141 .size = sizeof(struct nft_ct_helper_obj),
1142 .eval = nft_ct_helper_obj_eval,
1143 .init = nft_ct_helper_obj_init,
1144 .destroy = nft_ct_helper_obj_destroy,
1145 .dump = nft_ct_helper_obj_dump,
1146 };
1147
1148 static struct nft_object_type nft_ct_helper_obj_type __read_mostly = {
1149 .type = NFT_OBJECT_CT_HELPER,
1150 .ops = &nft_ct_helper_obj_ops,
1151 .maxattr = NFTA_CT_HELPER_MAX,
1152 .policy = nft_ct_helper_policy,
1153 .owner = THIS_MODULE,
1154 };
1155
1156 struct nft_ct_expect_obj {
1157 u16 l3num;
1158 __be16 dport;
1159 u8 l4proto;
1160 u8 size;
1161 u32 timeout;
1162 };
1163
nft_ct_expect_obj_init(const struct nft_ctx * ctx,const struct nlattr * const tb[],struct nft_object * obj)1164 static int nft_ct_expect_obj_init(const struct nft_ctx *ctx,
1165 const struct nlattr * const tb[],
1166 struct nft_object *obj)
1167 {
1168 struct nft_ct_expect_obj *priv = nft_obj_data(obj);
1169
1170 if (!tb[NFTA_CT_EXPECT_L4PROTO] ||
1171 !tb[NFTA_CT_EXPECT_DPORT] ||
1172 !tb[NFTA_CT_EXPECT_TIMEOUT] ||
1173 !tb[NFTA_CT_EXPECT_SIZE])
1174 return -EINVAL;
1175
1176 priv->l3num = ctx->family;
1177 if (tb[NFTA_CT_EXPECT_L3PROTO])
1178 priv->l3num = ntohs(nla_get_be16(tb[NFTA_CT_EXPECT_L3PROTO]));
1179
1180 switch (priv->l3num) {
1181 case NFPROTO_IPV4:
1182 case NFPROTO_IPV6:
1183 if (priv->l3num == ctx->family || ctx->family == NFPROTO_INET)
1184 break;
1185
1186 return -EINVAL;
1187 case NFPROTO_INET: /* tuple.src.l3num supports NFPROTO_IPV4/6 only */
1188 default:
1189 return -EAFNOSUPPORT;
1190 }
1191
1192 priv->l4proto = nla_get_u8(tb[NFTA_CT_EXPECT_L4PROTO]);
1193 switch (priv->l4proto) {
1194 case IPPROTO_TCP:
1195 case IPPROTO_UDP:
1196 case IPPROTO_UDPLITE:
1197 case IPPROTO_DCCP:
1198 case IPPROTO_SCTP:
1199 break;
1200 default:
1201 return -EOPNOTSUPP;
1202 }
1203
1204 priv->dport = nla_get_be16(tb[NFTA_CT_EXPECT_DPORT]);
1205 priv->timeout = nla_get_u32(tb[NFTA_CT_EXPECT_TIMEOUT]);
1206 priv->size = nla_get_u8(tb[NFTA_CT_EXPECT_SIZE]);
1207
1208 return nf_ct_netns_get(ctx->net, ctx->family);
1209 }
1210
nft_ct_expect_obj_destroy(const struct nft_ctx * ctx,struct nft_object * obj)1211 static void nft_ct_expect_obj_destroy(const struct nft_ctx *ctx,
1212 struct nft_object *obj)
1213 {
1214 nf_ct_netns_put(ctx->net, ctx->family);
1215 }
1216
nft_ct_expect_obj_dump(struct sk_buff * skb,struct nft_object * obj,bool reset)1217 static int nft_ct_expect_obj_dump(struct sk_buff *skb,
1218 struct nft_object *obj, bool reset)
1219 {
1220 const struct nft_ct_expect_obj *priv = nft_obj_data(obj);
1221
1222 if (nla_put_be16(skb, NFTA_CT_EXPECT_L3PROTO, htons(priv->l3num)) ||
1223 nla_put_u8(skb, NFTA_CT_EXPECT_L4PROTO, priv->l4proto) ||
1224 nla_put_be16(skb, NFTA_CT_EXPECT_DPORT, priv->dport) ||
1225 nla_put_u32(skb, NFTA_CT_EXPECT_TIMEOUT, priv->timeout) ||
1226 nla_put_u8(skb, NFTA_CT_EXPECT_SIZE, priv->size))
1227 return -1;
1228
1229 return 0;
1230 }
1231
nft_ct_expect_obj_eval(struct nft_object * obj,struct nft_regs * regs,const struct nft_pktinfo * pkt)1232 static void nft_ct_expect_obj_eval(struct nft_object *obj,
1233 struct nft_regs *regs,
1234 const struct nft_pktinfo *pkt)
1235 {
1236 const struct nft_ct_expect_obj *priv = nft_obj_data(obj);
1237 struct nf_conntrack_expect *exp;
1238 enum ip_conntrack_info ctinfo;
1239 struct nf_conn_help *help;
1240 enum ip_conntrack_dir dir;
1241 u16 l3num = priv->l3num;
1242 struct nf_conn *ct;
1243
1244 ct = nf_ct_get(pkt->skb, &ctinfo);
1245 if (!ct || nf_ct_is_confirmed(ct) || nf_ct_is_template(ct)) {
1246 regs->verdict.code = NFT_BREAK;
1247 return;
1248 }
1249 dir = CTINFO2DIR(ctinfo);
1250
1251 help = nfct_help(ct);
1252 if (!help)
1253 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1254 if (!help) {
1255 regs->verdict.code = NF_DROP;
1256 return;
1257 }
1258
1259 if (help->expecting[NF_CT_EXPECT_CLASS_DEFAULT] >= priv->size) {
1260 regs->verdict.code = NFT_BREAK;
1261 return;
1262 }
1263 if (l3num == NFPROTO_INET)
1264 l3num = nf_ct_l3num(ct);
1265
1266 exp = nf_ct_expect_alloc(ct);
1267 if (exp == NULL) {
1268 regs->verdict.code = NF_DROP;
1269 return;
1270 }
1271 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, l3num,
1272 &ct->tuplehash[!dir].tuple.src.u3,
1273 &ct->tuplehash[!dir].tuple.dst.u3,
1274 priv->l4proto, NULL, &priv->dport);
1275 exp->timeout.expires = jiffies + priv->timeout * HZ;
1276
1277 if (nf_ct_expect_related(exp, 0) != 0)
1278 regs->verdict.code = NF_DROP;
1279 }
1280
1281 static const struct nla_policy nft_ct_expect_policy[NFTA_CT_EXPECT_MAX + 1] = {
1282 [NFTA_CT_EXPECT_L3PROTO] = { .type = NLA_U16 },
1283 [NFTA_CT_EXPECT_L4PROTO] = { .type = NLA_U8 },
1284 [NFTA_CT_EXPECT_DPORT] = { .type = NLA_U16 },
1285 [NFTA_CT_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1286 [NFTA_CT_EXPECT_SIZE] = { .type = NLA_U8 },
1287 };
1288
1289 static struct nft_object_type nft_ct_expect_obj_type;
1290
1291 static const struct nft_object_ops nft_ct_expect_obj_ops = {
1292 .type = &nft_ct_expect_obj_type,
1293 .size = sizeof(struct nft_ct_expect_obj),
1294 .eval = nft_ct_expect_obj_eval,
1295 .init = nft_ct_expect_obj_init,
1296 .destroy = nft_ct_expect_obj_destroy,
1297 .dump = nft_ct_expect_obj_dump,
1298 };
1299
1300 static struct nft_object_type nft_ct_expect_obj_type __read_mostly = {
1301 .type = NFT_OBJECT_CT_EXPECT,
1302 .ops = &nft_ct_expect_obj_ops,
1303 .maxattr = NFTA_CT_EXPECT_MAX,
1304 .policy = nft_ct_expect_policy,
1305 .owner = THIS_MODULE,
1306 };
1307
nft_ct_module_init(void)1308 static int __init nft_ct_module_init(void)
1309 {
1310 int err;
1311
1312 BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > NFT_REG_SIZE);
1313
1314 err = nft_register_expr(&nft_ct_type);
1315 if (err < 0)
1316 return err;
1317
1318 err = nft_register_expr(&nft_notrack_type);
1319 if (err < 0)
1320 goto err1;
1321
1322 err = nft_register_obj(&nft_ct_helper_obj_type);
1323 if (err < 0)
1324 goto err2;
1325
1326 err = nft_register_obj(&nft_ct_expect_obj_type);
1327 if (err < 0)
1328 goto err3;
1329 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1330 err = nft_register_obj(&nft_ct_timeout_obj_type);
1331 if (err < 0)
1332 goto err4;
1333 #endif
1334 return 0;
1335
1336 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1337 err4:
1338 nft_unregister_obj(&nft_ct_expect_obj_type);
1339 #endif
1340 err3:
1341 nft_unregister_obj(&nft_ct_helper_obj_type);
1342 err2:
1343 nft_unregister_expr(&nft_notrack_type);
1344 err1:
1345 nft_unregister_expr(&nft_ct_type);
1346 return err;
1347 }
1348
nft_ct_module_exit(void)1349 static void __exit nft_ct_module_exit(void)
1350 {
1351 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1352 nft_unregister_obj(&nft_ct_timeout_obj_type);
1353 #endif
1354 nft_unregister_obj(&nft_ct_expect_obj_type);
1355 nft_unregister_obj(&nft_ct_helper_obj_type);
1356 nft_unregister_expr(&nft_notrack_type);
1357 nft_unregister_expr(&nft_ct_type);
1358 }
1359
1360 module_init(nft_ct_module_init);
1361 module_exit(nft_ct_module_exit);
1362
1363 MODULE_LICENSE("GPL");
1364 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1365 MODULE_ALIAS_NFT_EXPR("ct");
1366 MODULE_ALIAS_NFT_EXPR("notrack");
1367 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_HELPER);
1368 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_TIMEOUT);
1369 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_EXPECT);
1370