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Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
[mirror_ubuntu-jammy-kernel.git] / net / netfilter / nft_ct.c
CommitLineData
d2912cb1 1// SPDX-License-Identifier: GPL-2.0-only
96518518 2/*
ef1f7df9 3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
25443261 4 * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
96518518 5 *
96518518
PM		 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>
48f66c90 17#include <net/netfilter/nf_conntrack_acct.h>
96518518
PM		 18#include <net/netfilter/nf_conntrack_tuple.h>
19#include <net/netfilter/nf_conntrack_helper.h>
c4ede3d3 20#include <net/netfilter/nf_conntrack_ecache.h>
d2bf2f34 21#include <net/netfilter/nf_conntrack_labels.h>
7e0b2b57
HS		 22#include <net/netfilter/nf_conntrack_timeout.h>
23#include <net/netfilter/nf_conntrack_l4proto.h>
857b4602 24#include <net/netfilter/nf_conntrack_expect.h>
96518518
PM		 25
26struct nft_ct {
27 enum nft_ct_keys key:8;
28 enum ip_conntrack_dir dir:8;
d46f2cd2 29 union {
c4ede3d3
KE		 30 enum nft_registers dreg:8;
31 enum nft_registers sreg:8;
32 };
96518518
PM		 33};
34
1a64edf5
FW		 35struct nft_ct_helper_obj {
36 struct nf_conntrack_helper *helper4;
37 struct nf_conntrack_helper *helper6;
38 u8 l4proto;
39};
40
edee4f1e
FW		 41#ifdef CONFIG_NF_CONNTRACK_ZONES
42static DEFINE_PER_CPU(struct nf_conn *, nft_ct_pcpu_template);
43static unsigned int nft_ct_pcpu_template_refcnt __read_mostly;
44#endif
45
48f66c90
FW		 46static 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
c4ede3d3 58static void nft_ct_get_eval(const struct nft_expr *expr,
a55e22e9 59 struct nft_regs *regs,
c4ede3d3 60 const struct nft_pktinfo *pkt)
96518518
PM		 61{
62 const struct nft_ct *priv = nft_expr_priv(expr);
49499c3e 63 u32 *dest = &regs->data[priv->dreg];
96518518
PM		 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;
96518518
PM		 69 unsigned int state;
70
71 ct = nf_ct_get(pkt->skb, &ctinfo);
72
73 switch (priv->key) {
74 case NFT_CT_STATE:
cc41c84b
FW		 75 if (ct)
76 state = NF_CT_STATE_BIT(ctinfo);
77 else if (ctinfo == IP_CT_UNTRACKED)
96518518
PM		 78 state = NF_CT_STATE_UNTRACKED_BIT;
79 else
cc41c84b 80 state = NF_CT_STATE_INVALID_BIT;
fad136ea 81 *dest = state;
96518518 82 return;
c1f86676
DM		 83 default:
84 break;
96518518
PM		 85 }
86
87 if (ct == NULL)
88 goto err;
89
90 switch (priv->key) {
91 case NFT_CT_DIRECTION:
10596608 92 nft_reg_store8(dest, CTINFO2DIR(ctinfo));
96518518
PM		 93 return;
94 case NFT_CT_STATUS:
fad136ea 95 *dest = ct->status;
96518518
PM		 96 return;
97#ifdef CONFIG_NF_CONNTRACK_MARK
98 case NFT_CT_MARK:
fad136ea 99 *dest = ct->mark;
96518518
PM		 100 return;
101#endif
102#ifdef CONFIG_NF_CONNTRACK_SECMARK
103 case NFT_CT_SECMARK:
fad136ea 104 *dest = ct->secmark;
96518518
PM		 105 return;
106#endif
107 case NFT_CT_EXPIRATION:
c8607e02 108 *dest = jiffies_to_msecs(nf_ct_expires(ct));
96518518
PM		 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;
fad136ea 119 strncpy((char *)dest, helper->name, NF_CT_HELPER_NAME_LEN);
96518518 120 return;
d2bf2f34
FW		 121#ifdef CONFIG_NF_CONNTRACK_LABELS
122 case NFT_CT_LABELS: {
123 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
d2bf2f34 124
23014011
FW		 125 if (labels)
126 memcpy(dest, labels->bits, NF_CT_LABELS_MAX_SIZE);
127 else
fad136ea 128 memset(dest, 0, NF_CT_LABELS_MAX_SIZE);
d2bf2f34
FW		 129 return;
130 }
efaea94a 131#endif
48f66c90
FW		 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 }
949a3584
LZ		 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 }
d767ff2c 159 case NFT_CT_L3PROTOCOL:
10596608 160 nft_reg_store8(dest, nf_ct_l3num(ct));
d767ff2c
LZ		 161 return;
162 case NFT_CT_PROTOCOL:
10596608 163 nft_reg_store8(dest, nf_ct_protonum(ct));
d767ff2c 164 return;
ab23821f
FW		 165#ifdef CONFIG_NF_CONNTRACK_ZONES
166 case NFT_CT_ZONE: {
167 const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
10596608 168 u16 zoneid;
ab23821f
FW		 169
170 if (priv->dir < IP_CT_DIR_MAX)
10596608 171 zoneid = nf_ct_zone_id(zone, priv->dir);
ab23821f 172 else
10596608 173 zoneid = zone->id;
ab23821f 174
10596608 175 nft_reg_store16(dest, zoneid);
ab23821f
FW		 176 return;
177 }
178#endif
3087c3f7
BM		 179 case NFT_CT_ID:
180 if (!nf_ct_is_confirmed(ct))
181 goto err;
182 *dest = nf_ct_get_id(ct);
183 return;
c1f86676
DM		 184 default:
185 break;
96518518
PM		 186 }
187
188 tuple = &ct->tuplehash[priv->dir].tuple;
189 switch (priv->key) {
96518518 190 case NFT_CT_SRC:
fad136ea 191 memcpy(dest, tuple->src.u3.all,
96518518
PM		 192 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
193 return;
194 case NFT_CT_DST:
fad136ea 195 memcpy(dest, tuple->dst.u3.all,
96518518
PM		 196 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
197 return;
96518518 198 case NFT_CT_PROTO_SRC:
10596608 199 nft_reg_store16(dest, (__force u16)tuple->src.u.all);
96518518
PM		 200 return;
201 case NFT_CT_PROTO_DST:
10596608 202 nft_reg_store16(dest, (__force u16)tuple->dst.u.all);
96518518 203 return;
d719e3f2
PNA		 204 case NFT_CT_SRC_IP:
205 if (nf_ct_l3num(ct) != NFPROTO_IPV4)
206 goto err;
207 *dest = tuple->src.u3.ip;
208 return;
209 case NFT_CT_DST_IP:
210 if (nf_ct_l3num(ct) != NFPROTO_IPV4)
211 goto err;
212 *dest = tuple->dst.u3.ip;
213 return;
214 case NFT_CT_SRC_IP6:
215 if (nf_ct_l3num(ct) != NFPROTO_IPV6)
216 goto err;
217 memcpy(dest, tuple->src.u3.ip6, sizeof(struct in6_addr));
218 return;
219 case NFT_CT_DST_IP6:
220 if (nf_ct_l3num(ct) != NFPROTO_IPV6)
221 goto err;
222 memcpy(dest, tuple->dst.u3.ip6, sizeof(struct in6_addr));
223 return;
c1f86676
DM		 224 default:
225 break;
96518518
PM		 226 }
227 return;
228err:
a55e22e9 229 regs->verdict.code = NFT_BREAK;
96518518
PM		 230}
231
edee4f1e
FW		 232#ifdef CONFIG_NF_CONNTRACK_ZONES
233static void nft_ct_set_zone_eval(const struct nft_expr *expr,
234 struct nft_regs *regs,
235 const struct nft_pktinfo *pkt)
236{
237 struct nf_conntrack_zone zone = { .dir = NF_CT_DEFAULT_ZONE_DIR };
238 const struct nft_ct *priv = nft_expr_priv(expr);
239 struct sk_buff *skb = pkt->skb;
240 enum ip_conntrack_info ctinfo;
10596608 241 u16 value = nft_reg_load16(&regs->data[priv->sreg]);
edee4f1e
FW		 242 struct nf_conn *ct;
243
244 ct = nf_ct_get(skb, &ctinfo);
245 if (ct) /* already tracked */
246 return;
247
248 zone.id = value;
249
250 switch (priv->dir) {
251 case IP_CT_DIR_ORIGINAL:
252 zone.dir = NF_CT_ZONE_DIR_ORIG;
253 break;
254 case IP_CT_DIR_REPLY:
255 zone.dir = NF_CT_ZONE_DIR_REPL;
256 break;
257 default:
258 break;
259 }
260
261 ct = this_cpu_read(nft_ct_pcpu_template);
262
263 if (likely(atomic_read(&ct->ct_general.use) == 1)) {
264 nf_ct_zone_add(ct, &zone);
265 } else {
266 /* previous skb got queued to userspace */
267 ct = nf_ct_tmpl_alloc(nft_net(pkt), &zone, GFP_ATOMIC);
268 if (!ct) {
269 regs->verdict.code = NF_DROP;
270 return;
271 }
272 }
273
274 atomic_inc(&ct->ct_general.use);
275 nf_ct_set(skb, ct, IP_CT_NEW);
276}
277#endif
278
c4ede3d3 279static void nft_ct_set_eval(const struct nft_expr *expr,
a55e22e9 280 struct nft_regs *regs,
c4ede3d3
KE		 281 const struct nft_pktinfo *pkt)
282{
283 const struct nft_ct *priv = nft_expr_priv(expr);
284 struct sk_buff *skb = pkt->skb;
b473a1f5 285#if defined(CONFIG_NF_CONNTRACK_MARK) || defined(CONFIG_NF_CONNTRACK_SECMARK)
49499c3e 286 u32 value = regs->data[priv->sreg];
847c8e29 287#endif
c4ede3d3
KE		 288 enum ip_conntrack_info ctinfo;
289 struct nf_conn *ct;
290
291 ct = nf_ct_get(skb, &ctinfo);
694a0055 292 if (ct == NULL || nf_ct_is_template(ct))
c4ede3d3
KE		 293 return;
294
295 switch (priv->key) {
296#ifdef CONFIG_NF_CONNTRACK_MARK
297 case NFT_CT_MARK:
298 if (ct->mark != value) {
299 ct->mark = value;
300 nf_conntrack_event_cache(IPCT_MARK, ct);
301 }
302 break;
1ad8f48d 303#endif
b473a1f5
CG		 304#ifdef CONFIG_NF_CONNTRACK_SECMARK
305 case NFT_CT_SECMARK:
306 if (ct->secmark != value) {
307 ct->secmark = value;
308 nf_conntrack_event_cache(IPCT_SECMARK, ct);
309 }
310 break;
311#endif
1ad8f48d
FW		 312#ifdef CONFIG_NF_CONNTRACK_LABELS
313 case NFT_CT_LABELS:
314 nf_connlabels_replace(ct,
315 &regs->data[priv->sreg],
316 &regs->data[priv->sreg],
317 NF_CT_LABELS_MAX_SIZE / sizeof(u32));
318 break;
694a0055
FW		 319#endif
320#ifdef CONFIG_NF_CONNTRACK_EVENTS
321 case NFT_CT_EVENTMASK: {
322 struct nf_conntrack_ecache *e = nf_ct_ecache_find(ct);
323 u32 ctmask = regs->data[priv->sreg];
324
325 if (e) {
326 if (e->ctmask != ctmask)
327 e->ctmask = ctmask;
328 break;
329 }
330
331 if (ctmask && !nf_ct_is_confirmed(ct))
332 nf_ct_ecache_ext_add(ct, ctmask, 0, GFP_ATOMIC);
333 break;
334 }
c4ede3d3 335#endif
c1f86676
DM		 336 default:
337 break;
c4ede3d3
KE		 338 }
339}
340
96518518
PM		 341static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
342 [NFTA_CT_DREG] = { .type = NLA_U32 },
343 [NFTA_CT_KEY] = { .type = NLA_U32 },
344 [NFTA_CT_DIRECTION] = { .type = NLA_U8 },
c4ede3d3 345 [NFTA_CT_SREG] = { .type = NLA_U32 },
96518518
PM		 346};
347
edee4f1e
FW		 348#ifdef CONFIG_NF_CONNTRACK_ZONES
349static void nft_ct_tmpl_put_pcpu(void)
350{
351 struct nf_conn *ct;
352 int cpu;
353
354 for_each_possible_cpu(cpu) {
355 ct = per_cpu(nft_ct_pcpu_template, cpu);
356 if (!ct)
357 break;
358 nf_ct_put(ct);
359 per_cpu(nft_ct_pcpu_template, cpu) = NULL;
360 }
361}
362
363static bool nft_ct_tmpl_alloc_pcpu(void)
364{
365 struct nf_conntrack_zone zone = { .id = 0 };
366 struct nf_conn *tmp;
367 int cpu;
368
369 if (nft_ct_pcpu_template_refcnt)
370 return true;
371
372 for_each_possible_cpu(cpu) {
373 tmp = nf_ct_tmpl_alloc(&init_net, &zone, GFP_KERNEL);
374 if (!tmp) {
375 nft_ct_tmpl_put_pcpu();
376 return false;
377 }
378
379 atomic_set(&tmp->ct_general.use, 1);
380 per_cpu(nft_ct_pcpu_template, cpu) = tmp;
381 }
382
383 return true;
384}
385#endif
386
fe92ca45
PM		 387static int nft_ct_get_init(const struct nft_ctx *ctx,
388 const struct nft_expr *expr,
389 const struct nlattr * const tb[])
96518518
PM		 390{
391 struct nft_ct *priv = nft_expr_priv(expr);
45d9bcda 392 unsigned int len;
fe92ca45 393 int err;
96518518 394
fe92ca45 395 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
ab23821f 396 priv->dir = IP_CT_DIR_MAX;
96518518 397 switch (priv->key) {
96518518 398 case NFT_CT_DIRECTION:
45d9bcda
PM		 399 if (tb[NFTA_CT_DIRECTION] != NULL)
400 return -EINVAL;
401 len = sizeof(u8);
402 break;
403 case NFT_CT_STATE:
96518518
PM		 404 case NFT_CT_STATUS:
405#ifdef CONFIG_NF_CONNTRACK_MARK
406 case NFT_CT_MARK:
407#endif
408#ifdef CONFIG_NF_CONNTRACK_SECMARK
409 case NFT_CT_SECMARK:
d2bf2f34 410#endif
45d9bcda
PM		 411 case NFT_CT_EXPIRATION:
412 if (tb[NFTA_CT_DIRECTION] != NULL)
413 return -EINVAL;
414 len = sizeof(u32);
415 break;
d2bf2f34
FW		 416#ifdef CONFIG_NF_CONNTRACK_LABELS
417 case NFT_CT_LABELS:
45d9bcda
PM		 418 if (tb[NFTA_CT_DIRECTION] != NULL)
419 return -EINVAL;
420 len = NF_CT_LABELS_MAX_SIZE;
421 break;
96518518 422#endif
96518518
PM		 423 case NFT_CT_HELPER:
424 if (tb[NFTA_CT_DIRECTION] != NULL)
425 return -EINVAL;
45d9bcda 426 len = NF_CT_HELPER_NAME_LEN;
96518518 427 break;
45d9bcda 428
51292c07 429 case NFT_CT_L3PROTOCOL:
96518518 430 case NFT_CT_PROTOCOL:
d767ff2c
LZ		 431 /* For compatibility, do not report error if NFTA_CT_DIRECTION
432 * attribute is specified.
433 */
45d9bcda
PM		 434 len = sizeof(u8);
435 break;
96518518
PM		 436 case NFT_CT_SRC:
437 case NFT_CT_DST:
45d9bcda
PM		 438 if (tb[NFTA_CT_DIRECTION] == NULL)
439 return -EINVAL;
440
36596dad 441 switch (ctx->family) {
45d9bcda 442 case NFPROTO_IPV4:
c593642c 443 len = sizeof_field(struct nf_conntrack_tuple,
45d9bcda
PM		 444 src.u3.ip);
445 break;
446 case NFPROTO_IPV6:
447 case NFPROTO_INET:
c593642c 448 len = sizeof_field(struct nf_conntrack_tuple,
45d9bcda
PM		 449 src.u3.ip6);
450 break;
451 default:
452 return -EAFNOSUPPORT;
453 }
454 break;
d719e3f2
PNA		 455 case NFT_CT_SRC_IP:
456 case NFT_CT_DST_IP:
457 if (tb[NFTA_CT_DIRECTION] == NULL)
458 return -EINVAL;
459
c593642c 460 len = sizeof_field(struct nf_conntrack_tuple, src.u3.ip);
d719e3f2
PNA		 461 break;
462 case NFT_CT_SRC_IP6:
463 case NFT_CT_DST_IP6:
464 if (tb[NFTA_CT_DIRECTION] == NULL)
465 return -EINVAL;
466
c593642c 467 len = sizeof_field(struct nf_conntrack_tuple, src.u3.ip6);
d719e3f2 468 break;
96518518
PM		 469 case NFT_CT_PROTO_SRC:
470 case NFT_CT_PROTO_DST:
471 if (tb[NFTA_CT_DIRECTION] == NULL)
472 return -EINVAL;
c593642c 473 len = sizeof_field(struct nf_conntrack_tuple, src.u.all);
96518518 474 break;
48f66c90
FW		 475 case NFT_CT_BYTES:
476 case NFT_CT_PKTS:
949a3584 477 case NFT_CT_AVGPKT:
48f66c90
FW		 478 len = sizeof(u64);
479 break;
ab23821f
FW		 480#ifdef CONFIG_NF_CONNTRACK_ZONES
481 case NFT_CT_ZONE:
482 len = sizeof(u16);
483 break;
484#endif
3087c3f7
BM		 485 case NFT_CT_ID:
486 len = sizeof(u32);
487 break;
96518518
PM		 488 default:
489 return -EOPNOTSUPP;
490 }
491
fe92ca45
PM		 492 if (tb[NFTA_CT_DIRECTION] != NULL) {
493 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
494 switch (priv->dir) {
495 case IP_CT_DIR_ORIGINAL:
496 case IP_CT_DIR_REPLY:
497 break;
498 default:
499 return -EINVAL;
500 }
501 }
502
b1c96ed3 503 priv->dreg = nft_parse_register(tb[NFTA_CT_DREG]);
1ec10212
PM		 504 err = nft_validate_register_store(ctx, priv->dreg, NULL,
505 NFT_DATA_VALUE, len);
fe92ca45
PM		 506 if (err < 0)
507 return err;
508
36596dad 509 err = nf_ct_netns_get(ctx->net, ctx->family);
fe92ca45
PM		 510 if (err < 0)
511 return err;
512
949a3584
LZ		 513 if (priv->key == NFT_CT_BYTES ||
514 priv->key == NFT_CT_PKTS ||
515 priv->key == NFT_CT_AVGPKT)
3f8b61b7
LZ		 516 nf_ct_set_acct(ctx->net, true);
517
c4ede3d3
KE		 518 return 0;
519}
520
5c178d81
FW		 521static 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;
edee4f1e
FW		 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();
5c178d81
FW		 533#endif
534 default:
535 break;
536 }
537}
538
fe92ca45
PM		 539static int nft_ct_set_init(const struct nft_ctx *ctx,
540 const struct nft_expr *expr,
541 const struct nlattr * const tb[])
c4ede3d3 542{
fe92ca45 543 struct nft_ct *priv = nft_expr_priv(expr);
d07db988 544 unsigned int len;
fe92ca45
PM		 545 int err;
546
edee4f1e 547 priv->dir = IP_CT_DIR_MAX;
fe92ca45
PM		 548 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
549 switch (priv->key) {
e88e514e 550#ifdef CONFIG_NF_CONNTRACK_MARK
c4ede3d3 551 case NFT_CT_MARK:
7bfdde70
LZ		 552 if (tb[NFTA_CT_DIRECTION])
553 return -EINVAL;
c593642c 554 len = sizeof_field(struct nf_conn, mark);
c4ede3d3 555 break;
1ad8f48d
FW		 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;
edee4f1e
FW		 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++;
427345d6 572 len = sizeof(u16);
edee4f1e 573 break;
694a0055
FW		 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;
b473a1f5
CG		 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;
e88e514e 588#endif
c4ede3d3
KE		 589 default:
590 return -EOPNOTSUPP;
591 }
592
edee4f1e
FW		 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:
4494dbc6
LZ		 600 err = -EINVAL;
601 goto err1;
edee4f1e
FW		 602 }
603 }
604
b1c96ed3 605 priv->sreg = nft_parse_register(tb[NFTA_CT_SREG]);
d07db988 606 err = nft_validate_register_load(priv->sreg, len);
fe92ca45 607 if (err < 0)
590025a2 608 goto err1;
c4ede3d3 609
36596dad 610 err = nf_ct_netns_get(ctx->net, ctx->family);
96518518 611 if (err < 0)
590025a2 612 goto err1;
96518518 613
96518518 614 return 0;
590025a2
LZ		 615
616err1:
5c178d81 617 __nft_ct_set_destroy(ctx, priv);
590025a2
LZ		 618 return err;
619}
620
621static void nft_ct_get_destroy(const struct nft_ctx *ctx,
622 const struct nft_expr *expr)
623{
36596dad 624 nf_ct_netns_put(ctx->net, ctx->family);
96518518
PM		 625}
626
590025a2
LZ		 627static void nft_ct_set_destroy(const struct nft_ctx *ctx,
628 const struct nft_expr *expr)
96518518 629{
1ad8f48d
FW		 630 struct nft_ct *priv = nft_expr_priv(expr);
631
5c178d81 632 __nft_ct_set_destroy(ctx, priv);
36596dad 633 nf_ct_netns_put(ctx->net, ctx->family);
96518518
PM		 634}
635
c4ede3d3 636static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
96518518
PM		 637{
638 const struct nft_ct *priv = nft_expr_priv(expr);
639
b1c96ed3 640 if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg))
96518518
PM		 641 goto nla_put_failure;
642 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
643 goto nla_put_failure;
2a53bfb3
AB		 644
645 switch (priv->key) {
2a53bfb3
AB		 646 case NFT_CT_SRC:
647 case NFT_CT_DST:
d719e3f2
PNA		 648 case NFT_CT_SRC_IP:
649 case NFT_CT_DST_IP:
650 case NFT_CT_SRC_IP6:
651 case NFT_CT_DST_IP6:
2a53bfb3
AB		 652 case NFT_CT_PROTO_SRC:
653 case NFT_CT_PROTO_DST:
654 if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
655 goto nla_put_failure;
48f66c90
FW		 656 break;
657 case NFT_CT_BYTES:
658 case NFT_CT_PKTS:
949a3584 659 case NFT_CT_AVGPKT:
ab23821f 660 case NFT_CT_ZONE:
48f66c90
FW		 661 if (priv->dir < IP_CT_DIR_MAX &&
662 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
663 goto nla_put_failure;
664 break;
2a53bfb3
AB		 665 default:
666 break;
667 }
668
96518518
PM		 669 return 0;
670
671nla_put_failure:
672 return -1;
673}
674
c4ede3d3
KE		 675static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
676{
677 const struct nft_ct *priv = nft_expr_priv(expr);
678
b1c96ed3 679 if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg))
c4ede3d3
KE		 680 goto nla_put_failure;
681 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
682 goto nla_put_failure;
edee4f1e
FW		 683
684 switch (priv->key) {
685 case NFT_CT_ZONE:
686 if (priv->dir < IP_CT_DIR_MAX &&
687 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
688 goto nla_put_failure;
689 break;
690 default:
691 break;
692 }
693
c4ede3d3
KE		 694 return 0;
695
696nla_put_failure:
697 return -1;
698}
699
ef1f7df9 700static struct nft_expr_type nft_ct_type;
c4ede3d3 701static const struct nft_expr_ops nft_ct_get_ops = {
ef1f7df9 702 .type = &nft_ct_type,
96518518 703 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
c4ede3d3 704 .eval = nft_ct_get_eval,
fe92ca45 705 .init = nft_ct_get_init,
590025a2 706 .destroy = nft_ct_get_destroy,
c4ede3d3 707 .dump = nft_ct_get_dump,
ef1f7df9
PM		 708};
709
c4ede3d3
KE		 710static const struct nft_expr_ops nft_ct_set_ops = {
711 .type = &nft_ct_type,
712 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
713 .eval = nft_ct_set_eval,
fe92ca45 714 .init = nft_ct_set_init,
590025a2 715 .destroy = nft_ct_set_destroy,
c4ede3d3
KE		 716 .dump = nft_ct_set_dump,
717};
718
edee4f1e
FW		 719#ifdef CONFIG_NF_CONNTRACK_ZONES
720static const struct nft_expr_ops nft_ct_set_zone_ops = {
721 .type = &nft_ct_type,
722 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
723 .eval = nft_ct_set_zone_eval,
724 .init = nft_ct_set_init,
725 .destroy = nft_ct_set_destroy,
726 .dump = nft_ct_set_dump,
727};
728#endif
729
c4ede3d3
KE		 730static const struct nft_expr_ops *
731nft_ct_select_ops(const struct nft_ctx *ctx,
732 const struct nlattr * const tb[])
733{
734 if (tb[NFTA_CT_KEY] == NULL)
735 return ERR_PTR(-EINVAL);
736
737 if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG])
738 return ERR_PTR(-EINVAL);
739
740 if (tb[NFTA_CT_DREG])
741 return &nft_ct_get_ops;
742
edee4f1e
FW		 743 if (tb[NFTA_CT_SREG]) {
744#ifdef CONFIG_NF_CONNTRACK_ZONES
745 if (nla_get_be32(tb[NFTA_CT_KEY]) == htonl(NFT_CT_ZONE))
746 return &nft_ct_set_zone_ops;
747#endif
c4ede3d3 748 return &nft_ct_set_ops;
edee4f1e 749 }
c4ede3d3
KE		 750
751 return ERR_PTR(-EINVAL);
752}
753
ef1f7df9
PM		 754static struct nft_expr_type nft_ct_type __read_mostly = {
755 .name = "ct",
d4ef3835 756 .select_ops = nft_ct_select_ops,
96518518
PM		 757 .policy = nft_ct_policy,
758 .maxattr = NFTA_CT_MAX,
ef1f7df9 759 .owner = THIS_MODULE,
96518518
PM		 760};
761
25443261
PNA		 762static void nft_notrack_eval(const struct nft_expr *expr,
763 struct nft_regs *regs,
764 const struct nft_pktinfo *pkt)
765{
766 struct sk_buff *skb = pkt->skb;
767 enum ip_conntrack_info ctinfo;
768 struct nf_conn *ct;
769
770 ct = nf_ct_get(pkt->skb, &ctinfo);
771 /* Previously seen (loopback or untracked)? Ignore. */
cc41c84b 772 if (ct || ctinfo == IP_CT_UNTRACKED)
25443261
PNA		 773 return;
774
cc41c84b 775 nf_ct_set(skb, ct, IP_CT_UNTRACKED);
25443261
PNA		 776}
777
778static struct nft_expr_type nft_notrack_type;
779static const struct nft_expr_ops nft_notrack_ops = {
780 .type = &nft_notrack_type,
781 .size = NFT_EXPR_SIZE(0),
782 .eval = nft_notrack_eval,
783};
784
785static struct nft_expr_type nft_notrack_type __read_mostly = {
786 .name = "notrack",
787 .ops = &nft_notrack_ops,
788 .owner = THIS_MODULE,
789};
790
7e0b2b57
HS		 791#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
792static int
793nft_ct_timeout_parse_policy(void *timeouts,
794 const struct nf_conntrack_l4proto *l4proto,
795 struct net *net, const struct nlattr *attr)
796{
797 struct nlattr **tb;
798 int ret = 0;
799
7e0b2b57
HS		 800 tb = kcalloc(l4proto->ctnl_timeout.nlattr_max + 1, sizeof(*tb),
801 GFP_KERNEL);
802
803 if (!tb)
804 return -ENOMEM;
805
8cb08174
JB		 806 ret = nla_parse_nested_deprecated(tb,
807 l4proto->ctnl_timeout.nlattr_max,
808 attr,
809 l4proto->ctnl_timeout.nla_policy,
810 NULL);
7e0b2b57
HS		 811 if (ret < 0)
812 goto err;
813
814 ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts);
815
816err:
817 kfree(tb);
818 return ret;
819}
820
821struct nft_ct_timeout_obj {
0434ccdc 822 struct nf_ct_timeout *timeout;
7e0b2b57
HS		 823 u8 l4proto;
824};
825
826static void nft_ct_timeout_obj_eval(struct nft_object *obj,
827 struct nft_regs *regs,
828 const struct nft_pktinfo *pkt)
829{
830 const struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
831 struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb);
0434ccdc
FW		 832 struct nf_conn_timeout *timeout;
833 const unsigned int *values;
834
835 if (priv->l4proto != pkt->tprot)
836 return;
7e0b2b57 837
0434ccdc 838 if (!ct || nf_ct_is_template(ct) || nf_ct_is_confirmed(ct))
7e0b2b57
HS		 839 return;
840
0434ccdc
FW		 841 timeout = nf_ct_timeout_find(ct);
842 if (!timeout) {
843 timeout = nf_ct_timeout_ext_add(ct, priv->timeout, GFP_ATOMIC);
844 if (!timeout) {
845 regs->verdict.code = NF_DROP;
846 return;
847 }
848 }
849
850 rcu_assign_pointer(timeout->timeout, priv->timeout);
851
852 /* adjust the timeout as per 'new' state. ct is unconfirmed,
853 * so the current timestamp must not be added.
854 */
855 values = nf_ct_timeout_data(timeout);
856 if (values)
857 nf_ct_refresh(ct, pkt->skb, values[0]);
7e0b2b57
HS		 858}
859
860static int nft_ct_timeout_obj_init(const struct nft_ctx *ctx,
861 const struct nlattr * const tb[],
862 struct nft_object *obj)
863{
7e0b2b57
HS		 864 struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
865 const struct nf_conntrack_l4proto *l4proto;
7e0b2b57
HS		 866 struct nf_ct_timeout *timeout;
867 int l3num = ctx->family;
7e0b2b57
HS		 868 __u8 l4num;
869 int ret;
870
3206c516 871 if (!tb[NFTA_CT_TIMEOUT_L4PROTO] ||
7e0b2b57
HS		 872 !tb[NFTA_CT_TIMEOUT_DATA])
873 return -EINVAL;
874
3206c516
HS		 875 if (tb[NFTA_CT_TIMEOUT_L3PROTO])
876 l3num = ntohs(nla_get_be16(tb[NFTA_CT_TIMEOUT_L3PROTO]));
877
7e0b2b57
HS		 878 l4num = nla_get_u8(tb[NFTA_CT_TIMEOUT_L4PROTO]);
879 priv->l4proto = l4num;
880
4a60dc74 881 l4proto = nf_ct_l4proto_find(l4num);
7e0b2b57
HS		 882
883 if (l4proto->l4proto != l4num) {
884 ret = -EOPNOTSUPP;
885 goto err_proto_put;
886 }
887
888 timeout = kzalloc(sizeof(struct nf_ct_timeout) +
889 l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
890 if (timeout == NULL) {
891 ret = -ENOMEM;
892 goto err_proto_put;
893 }
894
895 ret = nft_ct_timeout_parse_policy(&timeout->data, l4proto, ctx->net,
896 tb[NFTA_CT_TIMEOUT_DATA]);
897 if (ret < 0)
898 goto err_free_timeout;
899
900 timeout->l3num = l3num;
901 timeout->l4proto = l4proto;
7e0b2b57
HS		 902
903 ret = nf_ct_netns_get(ctx->net, ctx->family);
904 if (ret < 0)
0434ccdc 905 goto err_free_timeout;
7e0b2b57 906
0434ccdc 907 priv->timeout = timeout;
7e0b2b57
HS		 908 return 0;
909
7e0b2b57
HS		 910err_free_timeout:
911 kfree(timeout);
912err_proto_put:
7e0b2b57
HS		 913 return ret;
914}
915
916static void nft_ct_timeout_obj_destroy(const struct nft_ctx *ctx,
917 struct nft_object *obj)
918{
919 struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
0434ccdc 920 struct nf_ct_timeout *timeout = priv->timeout;
7e0b2b57 921
7e0b2b57 922 nf_ct_untimeout(ctx->net, timeout);
7e0b2b57 923 nf_ct_netns_put(ctx->net, ctx->family);
0434ccdc 924 kfree(priv->timeout);
7e0b2b57
HS		 925}
926
927static int nft_ct_timeout_obj_dump(struct sk_buff *skb,
928 struct nft_object *obj, bool reset)
929{
930 const struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
0434ccdc 931 const struct nf_ct_timeout *timeout = priv->timeout;
7e0b2b57
HS		 932 struct nlattr *nest_params;
933 int ret;
934
935 if (nla_put_u8(skb, NFTA_CT_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) ||
936 nla_put_be16(skb, NFTA_CT_TIMEOUT_L3PROTO, htons(timeout->l3num)))
937 return -1;
938
ae0be8de 939 nest_params = nla_nest_start(skb, NFTA_CT_TIMEOUT_DATA);
7e0b2b57
HS		 940 if (!nest_params)
941 return -1;
942
943 ret = timeout->l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data);
944 if (ret < 0)
945 return -1;
946 nla_nest_end(skb, nest_params);
947 return 0;
948}
949
950static const struct nla_policy nft_ct_timeout_policy[NFTA_CT_TIMEOUT_MAX + 1] = {
951 [NFTA_CT_TIMEOUT_L3PROTO] = {.type = NLA_U16 },
952 [NFTA_CT_TIMEOUT_L4PROTO] = {.type = NLA_U8 },
953 [NFTA_CT_TIMEOUT_DATA] = {.type = NLA_NESTED },
954};
955
956static struct nft_object_type nft_ct_timeout_obj_type;
957
958static const struct nft_object_ops nft_ct_timeout_obj_ops = {
959 .type = &nft_ct_timeout_obj_type,
960 .size = sizeof(struct nft_ct_timeout_obj),
961 .eval = nft_ct_timeout_obj_eval,
962 .init = nft_ct_timeout_obj_init,
963 .destroy = nft_ct_timeout_obj_destroy,
964 .dump = nft_ct_timeout_obj_dump,
965};
966
967static struct nft_object_type nft_ct_timeout_obj_type __read_mostly = {
968 .type = NFT_OBJECT_CT_TIMEOUT,
969 .ops = &nft_ct_timeout_obj_ops,
970 .maxattr = NFTA_CT_TIMEOUT_MAX,
971 .policy = nft_ct_timeout_policy,
972 .owner = THIS_MODULE,
973};
974#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
975
1a64edf5
FW		 976static int nft_ct_helper_obj_init(const struct nft_ctx *ctx,
977 const struct nlattr * const tb[],
978 struct nft_object *obj)
979{
980 struct nft_ct_helper_obj *priv = nft_obj_data(obj);
981 struct nf_conntrack_helper *help4, *help6;
982 char name[NF_CT_HELPER_NAME_LEN];
36596dad 983 int family = ctx->family;
f699edb1 984 int err;
1a64edf5
FW		 985
986 if (!tb[NFTA_CT_HELPER_NAME] || !tb[NFTA_CT_HELPER_L4PROTO])
987 return -EINVAL;
988
989 priv->l4proto = nla_get_u8(tb[NFTA_CT_HELPER_L4PROTO]);
990 if (!priv->l4proto)
991 return -ENOENT;
992
993 nla_strlcpy(name, tb[NFTA_CT_HELPER_NAME], sizeof(name));
994
995 if (tb[NFTA_CT_HELPER_L3PROTO])
996 family = ntohs(nla_get_be16(tb[NFTA_CT_HELPER_L3PROTO]));
997
998 help4 = NULL;
999 help6 = NULL;
1000
1001 switch (family) {
1002 case NFPROTO_IPV4:
36596dad 1003 if (ctx->family == NFPROTO_IPV6)
1a64edf5
FW		 1004 return -EINVAL;
1005
1006 help4 = nf_conntrack_helper_try_module_get(name, family,
1007 priv->l4proto);
1008 break;
1009 case NFPROTO_IPV6:
36596dad 1010 if (ctx->family == NFPROTO_IPV4)
1a64edf5
FW		 1011 return -EINVAL;
1012
1013 help6 = nf_conntrack_helper_try_module_get(name, family,
1014 priv->l4proto);
1015 break;
1016 case NFPROTO_NETDEV: /* fallthrough */
1017 case NFPROTO_BRIDGE: /* same */
1018 case NFPROTO_INET:
1019 help4 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV4,
1020 priv->l4proto);
1021 help6 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV6,
1022 priv->l4proto);
1023 break;
1024 default:
1025 return -EAFNOSUPPORT;
1026 }
1027
1028 /* && is intentional; only error if INET found neither ipv4 or ipv6 */
1029 if (!help4 && !help6)
1030 return -ENOENT;
1031
1032 priv->helper4 = help4;
1033 priv->helper6 = help6;
1034
f699edb1
PNA		 1035 err = nf_ct_netns_get(ctx->net, ctx->family);
1036 if (err < 0)
1037 goto err_put_helper;
1038
1a64edf5 1039 return 0;
f699edb1
PNA		 1040
1041err_put_helper:
1042 if (priv->helper4)
1043 nf_conntrack_helper_put(priv->helper4);
1044 if (priv->helper6)
1045 nf_conntrack_helper_put(priv->helper6);
1046 return err;
1a64edf5
FW		 1047}
1048
00bfb320
PNA		 1049static void nft_ct_helper_obj_destroy(const struct nft_ctx *ctx,
1050 struct nft_object *obj)
1a64edf5
FW		 1051{
1052 struct nft_ct_helper_obj *priv = nft_obj_data(obj);
1053
1054 if (priv->helper4)
d91fc59c 1055 nf_conntrack_helper_put(priv->helper4);
1a64edf5 1056 if (priv->helper6)
d91fc59c 1057 nf_conntrack_helper_put(priv->helper6);
f699edb1
PNA		 1058
1059 nf_ct_netns_put(ctx->net, ctx->family);
1a64edf5
FW		 1060}
1061
1062static void nft_ct_helper_obj_eval(struct nft_object *obj,
1063 struct nft_regs *regs,
1064 const struct nft_pktinfo *pkt)
1065{
1066 const struct nft_ct_helper_obj *priv = nft_obj_data(obj);
1067 struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb);
1068 struct nf_conntrack_helper *to_assign = NULL;
1069 struct nf_conn_help *help;
1070
1071 if (!ct ||
1072 nf_ct_is_confirmed(ct) ||
1073 nf_ct_is_template(ct) ||
1074 priv->l4proto != nf_ct_protonum(ct))
1075 return;
1076
1077 switch (nf_ct_l3num(ct)) {
1078 case NFPROTO_IPV4:
1079 to_assign = priv->helper4;
1080 break;
1081 case NFPROTO_IPV6:
1082 to_assign = priv->helper6;
1083 break;
1084 default:
1085 WARN_ON_ONCE(1);
1086 return;
1087 }
1088
1089 if (!to_assign)
1090 return;
1091
1092 if (test_bit(IPS_HELPER_BIT, &ct->status))
1093 return;
1094
440534d3 1095 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1a64edf5
FW		 1096 if (help) {
1097 rcu_assign_pointer(help->helper, to_assign);
1098 set_bit(IPS_HELPER_BIT, &ct->status);
1099 }
1100}
1101
1102static int nft_ct_helper_obj_dump(struct sk_buff *skb,
1103 struct nft_object *obj, bool reset)
1104{
1105 const struct nft_ct_helper_obj *priv = nft_obj_data(obj);
b7153458 1106 const struct nf_conntrack_helper *helper;
1a64edf5
FW		 1107 u16 family;
1108
b7153458
TY		 1109 if (priv->helper4 && priv->helper6) {
1110 family = NFPROTO_INET;
1111 helper = priv->helper4;
1112 } else if (priv->helper6) {
1113 family = NFPROTO_IPV6;
1114 helper = priv->helper6;
1115 } else {
1116 family = NFPROTO_IPV4;
1117 helper = priv->helper4;
1118 }
1119
1a64edf5
FW		 1120 if (nla_put_string(skb, NFTA_CT_HELPER_NAME, helper->name))
1121 return -1;
1122
1123 if (nla_put_u8(skb, NFTA_CT_HELPER_L4PROTO, priv->l4proto))
1124 return -1;
1125
1a64edf5
FW		 1126 if (nla_put_be16(skb, NFTA_CT_HELPER_L3PROTO, htons(family)))
1127 return -1;
1128
1129 return 0;
1130}
1131
1132static const struct nla_policy nft_ct_helper_policy[NFTA_CT_HELPER_MAX + 1] = {
1133 [NFTA_CT_HELPER_NAME] = { .type = NLA_STRING,
1134 .len = NF_CT_HELPER_NAME_LEN - 1 },
1135 [NFTA_CT_HELPER_L3PROTO] = { .type = NLA_U16 },
1136 [NFTA_CT_HELPER_L4PROTO] = { .type = NLA_U8 },
1137};
1138
dfc46034
PBG		 1139static struct nft_object_type nft_ct_helper_obj_type;
1140static const struct nft_object_ops nft_ct_helper_obj_ops = {
1141 .type = &nft_ct_helper_obj_type,
1a64edf5 1142 .size = sizeof(struct nft_ct_helper_obj),
1a64edf5
FW		 1143 .eval = nft_ct_helper_obj_eval,
1144 .init = nft_ct_helper_obj_init,
1145 .destroy = nft_ct_helper_obj_destroy,
1146 .dump = nft_ct_helper_obj_dump,
dfc46034
PBG		 1147};
1148
1149static struct nft_object_type nft_ct_helper_obj_type __read_mostly = {
1150 .type = NFT_OBJECT_CT_HELPER,
1151 .ops = &nft_ct_helper_obj_ops,
1152 .maxattr = NFTA_CT_HELPER_MAX,
1153 .policy = nft_ct_helper_policy,
1a64edf5
FW		 1154 .owner = THIS_MODULE,
1155};
1156
857b4602
SV		 1157struct nft_ct_expect_obj {
1158 u16 l3num;
1159 __be16 dport;
1160 u8 l4proto;
1161 u8 size;
1162 u32 timeout;
1163};
1164
1165static int nft_ct_expect_obj_init(const struct nft_ctx *ctx,
1166 const struct nlattr * const tb[],
1167 struct nft_object *obj)
1168{
1169 struct nft_ct_expect_obj *priv = nft_obj_data(obj);
1170
1171 if (!tb[NFTA_CT_EXPECT_L4PROTO] ||
1172 !tb[NFTA_CT_EXPECT_DPORT] ||
1173 !tb[NFTA_CT_EXPECT_TIMEOUT] ||
1174 !tb[NFTA_CT_EXPECT_SIZE])
1175 return -EINVAL;
1176
1177 priv->l3num = ctx->family;
1178 if (tb[NFTA_CT_EXPECT_L3PROTO])
1179 priv->l3num = ntohs(nla_get_be16(tb[NFTA_CT_EXPECT_L3PROTO]));
1180
1181 priv->l4proto = nla_get_u8(tb[NFTA_CT_EXPECT_L4PROTO]);
1182 priv->dport = nla_get_be16(tb[NFTA_CT_EXPECT_DPORT]);
1183 priv->timeout = nla_get_u32(tb[NFTA_CT_EXPECT_TIMEOUT]);
1184 priv->size = nla_get_u8(tb[NFTA_CT_EXPECT_SIZE]);
1185
1186 return nf_ct_netns_get(ctx->net, ctx->family);
1187}
1188
1189static void nft_ct_expect_obj_destroy(const struct nft_ctx *ctx,
1190 struct nft_object *obj)
1191{
1192 nf_ct_netns_put(ctx->net, ctx->family);
1193}
1194
1195static int nft_ct_expect_obj_dump(struct sk_buff *skb,
1196 struct nft_object *obj, bool reset)
1197{
1198 const struct nft_ct_expect_obj *priv = nft_obj_data(obj);
1199
1200 if (nla_put_be16(skb, NFTA_CT_EXPECT_L3PROTO, htons(priv->l3num)) ||
1201 nla_put_u8(skb, NFTA_CT_EXPECT_L4PROTO, priv->l4proto) ||
1202 nla_put_be16(skb, NFTA_CT_EXPECT_DPORT, priv->dport) ||
1203 nla_put_u32(skb, NFTA_CT_EXPECT_TIMEOUT, priv->timeout) ||
1204 nla_put_u8(skb, NFTA_CT_EXPECT_SIZE, priv->size))
1205 return -1;
1206
1207 return 0;
1208}
1209
1210static void nft_ct_expect_obj_eval(struct nft_object *obj,
1211 struct nft_regs *regs,
1212 const struct nft_pktinfo *pkt)
1213{
1214 const struct nft_ct_expect_obj *priv = nft_obj_data(obj);
1215 struct nf_conntrack_expect *exp;
1216 enum ip_conntrack_info ctinfo;
1217 struct nf_conn_help *help;
1218 enum ip_conntrack_dir dir;
1219 u16 l3num = priv->l3num;
1220 struct nf_conn *ct;
1221
1222 ct = nf_ct_get(pkt->skb, &ctinfo);
1223 if (!ct || ctinfo == IP_CT_UNTRACKED) {
1224 regs->verdict.code = NFT_BREAK;
1225 return;
1226 }
1227 dir = CTINFO2DIR(ctinfo);
1228
1229 help = nfct_help(ct);
1230 if (!help)
1231 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2f0513d4
SV		 1232 if (!help) {
1233 regs->verdict.code = NF_DROP;
1234 return;
1235 }
857b4602
SV		 1236
1237 if (help->expecting[NF_CT_EXPECT_CLASS_DEFAULT] >= priv->size) {
1238 regs->verdict.code = NFT_BREAK;
1239 return;
1240 }
1241 if (l3num == NFPROTO_INET)
1242 l3num = nf_ct_l3num(ct);
1243
1244 exp = nf_ct_expect_alloc(ct);
1245 if (exp == NULL) {
1246 regs->verdict.code = NF_DROP;
1247 return;
1248 }
1249 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, l3num,
1250 &ct->tuplehash[!dir].tuple.src.u3,
1251 &ct->tuplehash[!dir].tuple.dst.u3,
1252 priv->l4proto, NULL, &priv->dport);
1253 exp->timeout.expires = jiffies + priv->timeout * HZ;
1254
3c00fb0b 1255 if (nf_ct_expect_related(exp, 0) != 0)
857b4602
SV		 1256 regs->verdict.code = NF_DROP;
1257}
1258
1259static const struct nla_policy nft_ct_expect_policy[NFTA_CT_EXPECT_MAX + 1] = {
1260 [NFTA_CT_EXPECT_L3PROTO] = { .type = NLA_U16 },
1261 [NFTA_CT_EXPECT_L4PROTO] = { .type = NLA_U8 },
1262 [NFTA_CT_EXPECT_DPORT] = { .type = NLA_U16 },
1263 [NFTA_CT_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1264 [NFTA_CT_EXPECT_SIZE] = { .type = NLA_U8 },
1265};
1266
1267static struct nft_object_type nft_ct_expect_obj_type;
1268
1269static const struct nft_object_ops nft_ct_expect_obj_ops = {
1270 .type = &nft_ct_expect_obj_type,
1271 .size = sizeof(struct nft_ct_expect_obj),
1272 .eval = nft_ct_expect_obj_eval,
1273 .init = nft_ct_expect_obj_init,
1274 .destroy = nft_ct_expect_obj_destroy,
1275 .dump = nft_ct_expect_obj_dump,
1276};
1277
1278static struct nft_object_type nft_ct_expect_obj_type __read_mostly = {
1279 .type = NFT_OBJECT_CT_EXPECT,
1280 .ops = &nft_ct_expect_obj_ops,
1281 .maxattr = NFTA_CT_EXPECT_MAX,
1282 .policy = nft_ct_expect_policy,
1283 .owner = THIS_MODULE,
1284};
1285
96518518
PM		 1286static int __init nft_ct_module_init(void)
1287{
25443261
PNA		 1288 int err;
1289
adff6c65
FW		 1290 BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > NFT_REG_SIZE);
1291
25443261
PNA		 1292 err = nft_register_expr(&nft_ct_type);
1293 if (err < 0)
1294 return err;
1295
1296 err = nft_register_expr(&nft_notrack_type);
1297 if (err < 0)
1298 goto err1;
1299
dfc46034 1300 err = nft_register_obj(&nft_ct_helper_obj_type);
1a64edf5
FW		 1301 if (err < 0)
1302 goto err2;
857b4602
SV		 1303
1304 err = nft_register_obj(&nft_ct_expect_obj_type);
1305 if (err < 0)
1306 goto err3;
7e0b2b57
HS		 1307#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1308 err = nft_register_obj(&nft_ct_timeout_obj_type);
1309 if (err < 0)
857b4602 1310 goto err4;
7e0b2b57 1311#endif
25443261 1312 return 0;
1a64edf5 1313
7e0b2b57 1314#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
857b4602
SV		 1315err4:
1316 nft_unregister_obj(&nft_ct_expect_obj_type);
1317#endif
7e0b2b57
HS		 1318err3:
1319 nft_unregister_obj(&nft_ct_helper_obj_type);
1a64edf5
FW		 1320err2:
1321 nft_unregister_expr(&nft_notrack_type);
25443261
PNA		 1322err1:
1323 nft_unregister_expr(&nft_ct_type);
1324 return err;
96518518
PM		 1325}
1326
1327static void __exit nft_ct_module_exit(void)
1328{
7e0b2b57
HS		 1329#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1330 nft_unregister_obj(&nft_ct_timeout_obj_type);
1331#endif
857b4602 1332 nft_unregister_obj(&nft_ct_expect_obj_type);
dfc46034 1333 nft_unregister_obj(&nft_ct_helper_obj_type);
25443261 1334 nft_unregister_expr(&nft_notrack_type);
ef1f7df9 1335 nft_unregister_expr(&nft_ct_type);
96518518
PM		 1336}
1337
1338module_init(nft_ct_module_init);
1339module_exit(nft_ct_module_exit);
1340
1341MODULE_LICENSE("GPL");
1342MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1343MODULE_ALIAS_NFT_EXPR("ct");
25443261 1344MODULE_ALIAS_NFT_EXPR("notrack");
1a64edf5 1345MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_HELPER);
7e0b2b57 1346MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_TIMEOUT);
857b4602 1347MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_EXPECT);
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