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net_sched: fix a memory leak in atm_tc_init()
[mirror_ubuntu-focal-kernel.git] / net / sched / act_ct.c
1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /* -
3 * net/sched/act_ct.c Connection Tracking action
4 *
5 * Authors: Paul Blakey <paulb@mellanox.com>
6 * Yossi Kuperman <yossiku@mellanox.com>
7 * Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
8 */
9
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/skbuff.h>
14 #include <linux/rtnetlink.h>
15 #include <linux/pkt_cls.h>
16 #include <linux/ip.h>
17 #include <linux/ipv6.h>
18 #include <net/netlink.h>
19 #include <net/pkt_sched.h>
20 #include <net/pkt_cls.h>
21 #include <net/act_api.h>
22 #include <net/ip.h>
23 #include <net/ipv6_frag.h>
24 #include <uapi/linux/tc_act/tc_ct.h>
25 #include <net/tc_act/tc_ct.h>
26
27 #include <net/netfilter/nf_conntrack.h>
28 #include <net/netfilter/nf_conntrack_core.h>
29 #include <net/netfilter/nf_conntrack_zones.h>
30 #include <net/netfilter/nf_conntrack_helper.h>
31 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
32 #include <uapi/linux/netfilter/nf_nat.h>
33
34 static struct tc_action_ops act_ct_ops;
35 static unsigned int ct_net_id;
36
37 struct tc_ct_action_net {
38 struct tc_action_net tn; /* Must be first */
39 bool labels;
40 };
41
42 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
43 static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
44 u16 zone_id, bool force)
45 {
46 enum ip_conntrack_info ctinfo;
47 struct nf_conn *ct;
48
49 ct = nf_ct_get(skb, &ctinfo);
50 if (!ct)
51 return false;
52 if (!net_eq(net, read_pnet(&ct->ct_net)))
53 return false;
54 if (nf_ct_zone(ct)->id != zone_id)
55 return false;
56
57 /* Force conntrack entry direction. */
58 if (force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
59 if (nf_ct_is_confirmed(ct))
60 nf_ct_kill(ct);
61
62 nf_conntrack_put(&ct->ct_general);
63 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
64
65 return false;
66 }
67
68 return true;
69 }
70
71 /* Trim the skb to the length specified by the IP/IPv6 header,
72 * removing any trailing lower-layer padding. This prepares the skb
73 * for higher-layer processing that assumes skb->len excludes padding
74 * (such as nf_ip_checksum). The caller needs to pull the skb to the
75 * network header, and ensure ip_hdr/ipv6_hdr points to valid data.
76 */
77 static int tcf_ct_skb_network_trim(struct sk_buff *skb, int family)
78 {
79 unsigned int len;
80 int err;
81
82 switch (family) {
83 case NFPROTO_IPV4:
84 len = ntohs(ip_hdr(skb)->tot_len);
85 break;
86 case NFPROTO_IPV6:
87 len = sizeof(struct ipv6hdr)
88 + ntohs(ipv6_hdr(skb)->payload_len);
89 break;
90 default:
91 len = skb->len;
92 }
93
94 err = pskb_trim_rcsum(skb, len);
95
96 return err;
97 }
98
99 static u8 tcf_ct_skb_nf_family(struct sk_buff *skb)
100 {
101 u8 family = NFPROTO_UNSPEC;
102
103 switch (skb->protocol) {
104 case htons(ETH_P_IP):
105 family = NFPROTO_IPV4;
106 break;
107 case htons(ETH_P_IPV6):
108 family = NFPROTO_IPV6;
109 break;
110 default:
111 break;
112 }
113
114 return family;
115 }
116
117 static int tcf_ct_ipv4_is_fragment(struct sk_buff *skb, bool *frag)
118 {
119 unsigned int len;
120
121 len = skb_network_offset(skb) + sizeof(struct iphdr);
122 if (unlikely(skb->len < len))
123 return -EINVAL;
124 if (unlikely(!pskb_may_pull(skb, len)))
125 return -ENOMEM;
126
127 *frag = ip_is_fragment(ip_hdr(skb));
128 return 0;
129 }
130
131 static int tcf_ct_ipv6_is_fragment(struct sk_buff *skb, bool *frag)
132 {
133 unsigned int flags = 0, len, payload_ofs = 0;
134 unsigned short frag_off;
135 int nexthdr;
136
137 len = skb_network_offset(skb) + sizeof(struct ipv6hdr);
138 if (unlikely(skb->len < len))
139 return -EINVAL;
140 if (unlikely(!pskb_may_pull(skb, len)))
141 return -ENOMEM;
142
143 nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
144 if (unlikely(nexthdr < 0))
145 return -EPROTO;
146
147 *frag = flags & IP6_FH_F_FRAG;
148 return 0;
149 }
150
151 static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
152 u8 family, u16 zone)
153 {
154 enum ip_conntrack_info ctinfo;
155 struct nf_conn *ct;
156 int err = 0;
157 bool frag;
158
159 /* Previously seen (loopback)? Ignore. */
160 ct = nf_ct_get(skb, &ctinfo);
161 if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED)
162 return 0;
163
164 if (family == NFPROTO_IPV4)
165 err = tcf_ct_ipv4_is_fragment(skb, &frag);
166 else
167 err = tcf_ct_ipv6_is_fragment(skb, &frag);
168 if (err || !frag)
169 return err;
170
171 skb_get(skb);
172
173 if (family == NFPROTO_IPV4) {
174 enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
175
176 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
177 local_bh_disable();
178 err = ip_defrag(net, skb, user);
179 local_bh_enable();
180 if (err && err != -EINPROGRESS)
181 goto out_free;
182 } else { /* NFPROTO_IPV6 */
183 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
184 enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
185
186 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
187 err = nf_ct_frag6_gather(net, skb, user);
188 if (err && err != -EINPROGRESS)
189 goto out_free;
190 #else
191 err = -EOPNOTSUPP;
192 goto out_free;
193 #endif
194 }
195
196 skb_clear_hash(skb);
197 skb->ignore_df = 1;
198 return err;
199
200 out_free:
201 kfree_skb(skb);
202 return err;
203 }
204
205 static void tcf_ct_params_free(struct rcu_head *head)
206 {
207 struct tcf_ct_params *params = container_of(head,
208 struct tcf_ct_params, rcu);
209
210 if (params->tmpl)
211 nf_conntrack_put(&params->tmpl->ct_general);
212 kfree(params);
213 }
214
215 #if IS_ENABLED(CONFIG_NF_NAT)
216 /* Modelled after nf_nat_ipv[46]_fn().
217 * range is only used for new, uninitialized NAT state.
218 * Returns either NF_ACCEPT or NF_DROP.
219 */
220 static int ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct,
221 enum ip_conntrack_info ctinfo,
222 const struct nf_nat_range2 *range,
223 enum nf_nat_manip_type maniptype)
224 {
225 int hooknum, err = NF_ACCEPT;
226
227 /* See HOOK2MANIP(). */
228 if (maniptype == NF_NAT_MANIP_SRC)
229 hooknum = NF_INET_LOCAL_IN; /* Source NAT */
230 else
231 hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */
232
233 switch (ctinfo) {
234 case IP_CT_RELATED:
235 case IP_CT_RELATED_REPLY:
236 if (skb->protocol == htons(ETH_P_IP) &&
237 ip_hdr(skb)->protocol == IPPROTO_ICMP) {
238 if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
239 hooknum))
240 err = NF_DROP;
241 goto out;
242 } else if (IS_ENABLED(CONFIG_IPV6) &&
243 skb->protocol == htons(ETH_P_IPV6)) {
244 __be16 frag_off;
245 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
246 int hdrlen = ipv6_skip_exthdr(skb,
247 sizeof(struct ipv6hdr),
248 &nexthdr, &frag_off);
249
250 if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
251 if (!nf_nat_icmpv6_reply_translation(skb, ct,
252 ctinfo,
253 hooknum,
254 hdrlen))
255 err = NF_DROP;
256 goto out;
257 }
258 }
259 /* Non-ICMP, fall thru to initialize if needed. */
260 /* fall through */
261 case IP_CT_NEW:
262 /* Seen it before? This can happen for loopback, retrans,
263 * or local packets.
264 */
265 if (!nf_nat_initialized(ct, maniptype)) {
266 /* Initialize according to the NAT action. */
267 err = (range && range->flags & NF_NAT_RANGE_MAP_IPS)
268 /* Action is set up to establish a new
269 * mapping.
270 */
271 ? nf_nat_setup_info(ct, range, maniptype)
272 : nf_nat_alloc_null_binding(ct, hooknum);
273 if (err != NF_ACCEPT)
274 goto out;
275 }
276 break;
277
278 case IP_CT_ESTABLISHED:
279 case IP_CT_ESTABLISHED_REPLY:
280 break;
281
282 default:
283 err = NF_DROP;
284 goto out;
285 }
286
287 err = nf_nat_packet(ct, ctinfo, hooknum, skb);
288 out:
289 return err;
290 }
291 #endif /* CONFIG_NF_NAT */
292
293 static void tcf_ct_act_set_mark(struct nf_conn *ct, u32 mark, u32 mask)
294 {
295 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
296 u32 new_mark;
297
298 if (!mask)
299 return;
300
301 new_mark = mark | (ct->mark & ~(mask));
302 if (ct->mark != new_mark) {
303 ct->mark = new_mark;
304 if (nf_ct_is_confirmed(ct))
305 nf_conntrack_event_cache(IPCT_MARK, ct);
306 }
307 #endif
308 }
309
310 static void tcf_ct_act_set_labels(struct nf_conn *ct,
311 u32 *labels,
312 u32 *labels_m)
313 {
314 #if IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)
315 size_t labels_sz = FIELD_SIZEOF(struct tcf_ct_params, labels);
316
317 if (!memchr_inv(labels_m, 0, labels_sz))
318 return;
319
320 nf_connlabels_replace(ct, labels, labels_m, 4);
321 #endif
322 }
323
324 static int tcf_ct_act_nat(struct sk_buff *skb,
325 struct nf_conn *ct,
326 enum ip_conntrack_info ctinfo,
327 int ct_action,
328 struct nf_nat_range2 *range,
329 bool commit)
330 {
331 #if IS_ENABLED(CONFIG_NF_NAT)
332 int err;
333 enum nf_nat_manip_type maniptype;
334
335 if (!(ct_action & TCA_CT_ACT_NAT))
336 return NF_ACCEPT;
337
338 /* Add NAT extension if not confirmed yet. */
339 if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
340 return NF_DROP; /* Can't NAT. */
341
342 if (ctinfo != IP_CT_NEW && (ct->status & IPS_NAT_MASK) &&
343 (ctinfo != IP_CT_RELATED || commit)) {
344 /* NAT an established or related connection like before. */
345 if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY)
346 /* This is the REPLY direction for a connection
347 * for which NAT was applied in the forward
348 * direction. Do the reverse NAT.
349 */
350 maniptype = ct->status & IPS_SRC_NAT
351 ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC;
352 else
353 maniptype = ct->status & IPS_SRC_NAT
354 ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST;
355 } else if (ct_action & TCA_CT_ACT_NAT_SRC) {
356 maniptype = NF_NAT_MANIP_SRC;
357 } else if (ct_action & TCA_CT_ACT_NAT_DST) {
358 maniptype = NF_NAT_MANIP_DST;
359 } else {
360 return NF_ACCEPT;
361 }
362
363 err = ct_nat_execute(skb, ct, ctinfo, range, maniptype);
364 if (err == NF_ACCEPT &&
365 ct->status & IPS_SRC_NAT && ct->status & IPS_DST_NAT) {
366 if (maniptype == NF_NAT_MANIP_SRC)
367 maniptype = NF_NAT_MANIP_DST;
368 else
369 maniptype = NF_NAT_MANIP_SRC;
370
371 err = ct_nat_execute(skb, ct, ctinfo, range, maniptype);
372 }
373 return err;
374 #else
375 return NF_ACCEPT;
376 #endif
377 }
378
379 static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
380 struct tcf_result *res)
381 {
382 struct net *net = dev_net(skb->dev);
383 bool cached, commit, clear, force;
384 enum ip_conntrack_info ctinfo;
385 struct tcf_ct *c = to_ct(a);
386 struct nf_conn *tmpl = NULL;
387 struct nf_hook_state state;
388 int nh_ofs, err, retval;
389 struct tcf_ct_params *p;
390 struct nf_conn *ct;
391 u8 family;
392
393 p = rcu_dereference_bh(c->params);
394
395 retval = READ_ONCE(c->tcf_action);
396 commit = p->ct_action & TCA_CT_ACT_COMMIT;
397 clear = p->ct_action & TCA_CT_ACT_CLEAR;
398 force = p->ct_action & TCA_CT_ACT_FORCE;
399 tmpl = p->tmpl;
400
401 if (clear) {
402 ct = nf_ct_get(skb, &ctinfo);
403 if (ct) {
404 nf_conntrack_put(&ct->ct_general);
405 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
406 }
407
408 goto out;
409 }
410
411 family = tcf_ct_skb_nf_family(skb);
412 if (family == NFPROTO_UNSPEC)
413 goto drop;
414
415 /* The conntrack module expects to be working at L3.
416 * We also try to pull the IPv4/6 header to linear area
417 */
418 nh_ofs = skb_network_offset(skb);
419 skb_pull_rcsum(skb, nh_ofs);
420 err = tcf_ct_handle_fragments(net, skb, family, p->zone);
421 if (err == -EINPROGRESS) {
422 retval = TC_ACT_STOLEN;
423 goto out;
424 }
425 if (err)
426 goto drop;
427
428 err = tcf_ct_skb_network_trim(skb, family);
429 if (err)
430 goto drop;
431
432 /* If we are recirculating packets to match on ct fields and
433 * committing with a separate ct action, then we don't need to
434 * actually run the packet through conntrack twice unless it's for a
435 * different zone.
436 */
437 cached = tcf_ct_skb_nfct_cached(net, skb, p->zone, force);
438 if (!cached) {
439 /* Associate skb with specified zone. */
440 if (tmpl) {
441 ct = nf_ct_get(skb, &ctinfo);
442 if (skb_nfct(skb))
443 nf_conntrack_put(skb_nfct(skb));
444 nf_conntrack_get(&tmpl->ct_general);
445 nf_ct_set(skb, tmpl, IP_CT_NEW);
446 }
447
448 state.hook = NF_INET_PRE_ROUTING;
449 state.net = net;
450 state.pf = family;
451 err = nf_conntrack_in(skb, &state);
452 if (err != NF_ACCEPT)
453 goto out_push;
454 }
455
456 ct = nf_ct_get(skb, &ctinfo);
457 if (!ct)
458 goto out_push;
459 nf_ct_deliver_cached_events(ct);
460
461 err = tcf_ct_act_nat(skb, ct, ctinfo, p->ct_action, &p->range, commit);
462 if (err != NF_ACCEPT)
463 goto drop;
464
465 if (commit) {
466 tcf_ct_act_set_mark(ct, p->mark, p->mark_mask);
467 tcf_ct_act_set_labels(ct, p->labels, p->labels_mask);
468
469 /* This will take care of sending queued events
470 * even if the connection is already confirmed.
471 */
472 nf_conntrack_confirm(skb);
473 }
474
475 out_push:
476 skb_push_rcsum(skb, nh_ofs);
477
478 out:
479 bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), skb);
480 return retval;
481
482 drop:
483 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats));
484 return TC_ACT_SHOT;
485 }
486
487 static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
488 [TCA_CT_UNSPEC] = { .strict_start_type = TCA_CT_UNSPEC + 1 },
489 [TCA_CT_ACTION] = { .type = NLA_U16 },
490 [TCA_CT_PARMS] = { .type = NLA_EXACT_LEN, .len = sizeof(struct tc_ct) },
491 [TCA_CT_ZONE] = { .type = NLA_U16 },
492 [TCA_CT_MARK] = { .type = NLA_U32 },
493 [TCA_CT_MARK_MASK] = { .type = NLA_U32 },
494 [TCA_CT_LABELS] = { .type = NLA_BINARY,
495 .len = 128 / BITS_PER_BYTE },
496 [TCA_CT_LABELS_MASK] = { .type = NLA_BINARY,
497 .len = 128 / BITS_PER_BYTE },
498 [TCA_CT_NAT_IPV4_MIN] = { .type = NLA_U32 },
499 [TCA_CT_NAT_IPV4_MAX] = { .type = NLA_U32 },
500 [TCA_CT_NAT_IPV6_MIN] = { .type = NLA_EXACT_LEN,
501 .len = sizeof(struct in6_addr) },
502 [TCA_CT_NAT_IPV6_MAX] = { .type = NLA_EXACT_LEN,
503 .len = sizeof(struct in6_addr) },
504 [TCA_CT_NAT_PORT_MIN] = { .type = NLA_U16 },
505 [TCA_CT_NAT_PORT_MAX] = { .type = NLA_U16 },
506 };
507
508 static int tcf_ct_fill_params_nat(struct tcf_ct_params *p,
509 struct tc_ct *parm,
510 struct nlattr **tb,
511 struct netlink_ext_ack *extack)
512 {
513 struct nf_nat_range2 *range;
514
515 if (!(p->ct_action & TCA_CT_ACT_NAT))
516 return 0;
517
518 if (!IS_ENABLED(CONFIG_NF_NAT)) {
519 NL_SET_ERR_MSG_MOD(extack, "Netfilter nat isn't enabled in kernel");
520 return -EOPNOTSUPP;
521 }
522
523 if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
524 return 0;
525
526 if ((p->ct_action & TCA_CT_ACT_NAT_SRC) &&
527 (p->ct_action & TCA_CT_ACT_NAT_DST)) {
528 NL_SET_ERR_MSG_MOD(extack, "dnat and snat can't be enabled at the same time");
529 return -EOPNOTSUPP;
530 }
531
532 range = &p->range;
533 if (tb[TCA_CT_NAT_IPV4_MIN]) {
534 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV4_MAX];
535
536 p->ipv4_range = true;
537 range->flags |= NF_NAT_RANGE_MAP_IPS;
538 range->min_addr.ip =
539 nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MIN]);
540
541 range->max_addr.ip = max_attr ?
542 nla_get_in_addr(max_attr) :
543 range->min_addr.ip;
544 } else if (tb[TCA_CT_NAT_IPV6_MIN]) {
545 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV6_MAX];
546
547 p->ipv4_range = false;
548 range->flags |= NF_NAT_RANGE_MAP_IPS;
549 range->min_addr.in6 =
550 nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MIN]);
551
552 range->max_addr.in6 = max_attr ?
553 nla_get_in6_addr(max_attr) :
554 range->min_addr.in6;
555 }
556
557 if (tb[TCA_CT_NAT_PORT_MIN]) {
558 range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
559 range->min_proto.all = nla_get_be16(tb[TCA_CT_NAT_PORT_MIN]);
560
561 range->max_proto.all = tb[TCA_CT_NAT_PORT_MAX] ?
562 nla_get_be16(tb[TCA_CT_NAT_PORT_MAX]) :
563 range->min_proto.all;
564 }
565
566 return 0;
567 }
568
569 static void tcf_ct_set_key_val(struct nlattr **tb,
570 void *val, int val_type,
571 void *mask, int mask_type,
572 int len)
573 {
574 if (!tb[val_type])
575 return;
576 nla_memcpy(val, tb[val_type], len);
577
578 if (!mask)
579 return;
580
581 if (mask_type == TCA_CT_UNSPEC || !tb[mask_type])
582 memset(mask, 0xff, len);
583 else
584 nla_memcpy(mask, tb[mask_type], len);
585 }
586
587 static int tcf_ct_fill_params(struct net *net,
588 struct tcf_ct_params *p,
589 struct tc_ct *parm,
590 struct nlattr **tb,
591 struct netlink_ext_ack *extack)
592 {
593 struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
594 struct nf_conntrack_zone zone;
595 struct nf_conn *tmpl;
596 int err;
597
598 p->zone = NF_CT_DEFAULT_ZONE_ID;
599
600 tcf_ct_set_key_val(tb,
601 &p->ct_action, TCA_CT_ACTION,
602 NULL, TCA_CT_UNSPEC,
603 sizeof(p->ct_action));
604
605 if (p->ct_action & TCA_CT_ACT_CLEAR)
606 return 0;
607
608 err = tcf_ct_fill_params_nat(p, parm, tb, extack);
609 if (err)
610 return err;
611
612 if (tb[TCA_CT_MARK]) {
613 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)) {
614 NL_SET_ERR_MSG_MOD(extack, "Conntrack mark isn't enabled.");
615 return -EOPNOTSUPP;
616 }
617 tcf_ct_set_key_val(tb,
618 &p->mark, TCA_CT_MARK,
619 &p->mark_mask, TCA_CT_MARK_MASK,
620 sizeof(p->mark));
621 }
622
623 if (tb[TCA_CT_LABELS]) {
624 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) {
625 NL_SET_ERR_MSG_MOD(extack, "Conntrack labels isn't enabled.");
626 return -EOPNOTSUPP;
627 }
628
629 if (!tn->labels) {
630 NL_SET_ERR_MSG_MOD(extack, "Failed to set connlabel length");
631 return -EOPNOTSUPP;
632 }
633 tcf_ct_set_key_val(tb,
634 p->labels, TCA_CT_LABELS,
635 p->labels_mask, TCA_CT_LABELS_MASK,
636 sizeof(p->labels));
637 }
638
639 if (tb[TCA_CT_ZONE]) {
640 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)) {
641 NL_SET_ERR_MSG_MOD(extack, "Conntrack zones isn't enabled.");
642 return -EOPNOTSUPP;
643 }
644
645 tcf_ct_set_key_val(tb,
646 &p->zone, TCA_CT_ZONE,
647 NULL, TCA_CT_UNSPEC,
648 sizeof(p->zone));
649 }
650
651 if (p->zone == NF_CT_DEFAULT_ZONE_ID)
652 return 0;
653
654 nf_ct_zone_init(&zone, p->zone, NF_CT_DEFAULT_ZONE_DIR, 0);
655 tmpl = nf_ct_tmpl_alloc(net, &zone, GFP_KERNEL);
656 if (!tmpl) {
657 NL_SET_ERR_MSG_MOD(extack, "Failed to allocate conntrack template");
658 return -ENOMEM;
659 }
660 __set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
661 nf_conntrack_get(&tmpl->ct_general);
662 p->tmpl = tmpl;
663
664 return 0;
665 }
666
667 static int tcf_ct_init(struct net *net, struct nlattr *nla,
668 struct nlattr *est, struct tc_action **a,
669 int replace, int bind, bool rtnl_held,
670 struct tcf_proto *tp,
671 struct netlink_ext_ack *extack)
672 {
673 struct tc_action_net *tn = net_generic(net, ct_net_id);
674 struct tcf_ct_params *params = NULL;
675 struct nlattr *tb[TCA_CT_MAX + 1];
676 struct tcf_chain *goto_ch = NULL;
677 struct tc_ct *parm;
678 struct tcf_ct *c;
679 int err, res = 0;
680 u32 index;
681
682 if (!nla) {
683 NL_SET_ERR_MSG_MOD(extack, "Ct requires attributes to be passed");
684 return -EINVAL;
685 }
686
687 err = nla_parse_nested(tb, TCA_CT_MAX, nla, ct_policy, extack);
688 if (err < 0)
689 return err;
690
691 if (!tb[TCA_CT_PARMS]) {
692 NL_SET_ERR_MSG_MOD(extack, "Missing required ct parameters");
693 return -EINVAL;
694 }
695 parm = nla_data(tb[TCA_CT_PARMS]);
696 index = parm->index;
697 err = tcf_idr_check_alloc(tn, &index, a, bind);
698 if (err < 0)
699 return err;
700
701 if (!err) {
702 err = tcf_idr_create(tn, index, est, a,
703 &act_ct_ops, bind, true);
704 if (err) {
705 tcf_idr_cleanup(tn, index);
706 return err;
707 }
708 res = ACT_P_CREATED;
709 } else {
710 if (bind)
711 return 0;
712
713 if (!replace) {
714 tcf_idr_release(*a, bind);
715 return -EEXIST;
716 }
717 }
718 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
719 if (err < 0)
720 goto cleanup;
721
722 c = to_ct(*a);
723
724 params = kzalloc(sizeof(*params), GFP_KERNEL);
725 if (unlikely(!params)) {
726 err = -ENOMEM;
727 goto cleanup;
728 }
729
730 err = tcf_ct_fill_params(net, params, parm, tb, extack);
731 if (err)
732 goto cleanup;
733
734 spin_lock_bh(&c->tcf_lock);
735 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
736 rcu_swap_protected(c->params, params, lockdep_is_held(&c->tcf_lock));
737 spin_unlock_bh(&c->tcf_lock);
738
739 if (goto_ch)
740 tcf_chain_put_by_act(goto_ch);
741 if (params)
742 call_rcu(&params->rcu, tcf_ct_params_free);
743 if (res == ACT_P_CREATED)
744 tcf_idr_insert(tn, *a);
745
746 return res;
747
748 cleanup:
749 if (goto_ch)
750 tcf_chain_put_by_act(goto_ch);
751 kfree(params);
752 tcf_idr_release(*a, bind);
753 return err;
754 }
755
756 static void tcf_ct_cleanup(struct tc_action *a)
757 {
758 struct tcf_ct_params *params;
759 struct tcf_ct *c = to_ct(a);
760
761 params = rcu_dereference_protected(c->params, 1);
762 if (params)
763 call_rcu(&params->rcu, tcf_ct_params_free);
764 }
765
766 static int tcf_ct_dump_key_val(struct sk_buff *skb,
767 void *val, int val_type,
768 void *mask, int mask_type,
769 int len)
770 {
771 int err;
772
773 if (mask && !memchr_inv(mask, 0, len))
774 return 0;
775
776 err = nla_put(skb, val_type, len, val);
777 if (err)
778 return err;
779
780 if (mask_type != TCA_CT_UNSPEC) {
781 err = nla_put(skb, mask_type, len, mask);
782 if (err)
783 return err;
784 }
785
786 return 0;
787 }
788
789 static int tcf_ct_dump_nat(struct sk_buff *skb, struct tcf_ct_params *p)
790 {
791 struct nf_nat_range2 *range = &p->range;
792
793 if (!(p->ct_action & TCA_CT_ACT_NAT))
794 return 0;
795
796 if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
797 return 0;
798
799 if (range->flags & NF_NAT_RANGE_MAP_IPS) {
800 if (p->ipv4_range) {
801 if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MIN,
802 range->min_addr.ip))
803 return -1;
804 if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MAX,
805 range->max_addr.ip))
806 return -1;
807 } else {
808 if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MIN,
809 &range->min_addr.in6))
810 return -1;
811 if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MAX,
812 &range->max_addr.in6))
813 return -1;
814 }
815 }
816
817 if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
818 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MIN,
819 range->min_proto.all))
820 return -1;
821 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MAX,
822 range->max_proto.all))
823 return -1;
824 }
825
826 return 0;
827 }
828
829 static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a,
830 int bind, int ref)
831 {
832 unsigned char *b = skb_tail_pointer(skb);
833 struct tcf_ct *c = to_ct(a);
834 struct tcf_ct_params *p;
835
836 struct tc_ct opt = {
837 .index = c->tcf_index,
838 .refcnt = refcount_read(&c->tcf_refcnt) - ref,
839 .bindcnt = atomic_read(&c->tcf_bindcnt) - bind,
840 };
841 struct tcf_t t;
842
843 spin_lock_bh(&c->tcf_lock);
844 p = rcu_dereference_protected(c->params,
845 lockdep_is_held(&c->tcf_lock));
846 opt.action = c->tcf_action;
847
848 if (tcf_ct_dump_key_val(skb,
849 &p->ct_action, TCA_CT_ACTION,
850 NULL, TCA_CT_UNSPEC,
851 sizeof(p->ct_action)))
852 goto nla_put_failure;
853
854 if (p->ct_action & TCA_CT_ACT_CLEAR)
855 goto skip_dump;
856
857 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
858 tcf_ct_dump_key_val(skb,
859 &p->mark, TCA_CT_MARK,
860 &p->mark_mask, TCA_CT_MARK_MASK,
861 sizeof(p->mark)))
862 goto nla_put_failure;
863
864 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
865 tcf_ct_dump_key_val(skb,
866 p->labels, TCA_CT_LABELS,
867 p->labels_mask, TCA_CT_LABELS_MASK,
868 sizeof(p->labels)))
869 goto nla_put_failure;
870
871 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
872 tcf_ct_dump_key_val(skb,
873 &p->zone, TCA_CT_ZONE,
874 NULL, TCA_CT_UNSPEC,
875 sizeof(p->zone)))
876 goto nla_put_failure;
877
878 if (tcf_ct_dump_nat(skb, p))
879 goto nla_put_failure;
880
881 skip_dump:
882 if (nla_put(skb, TCA_CT_PARMS, sizeof(opt), &opt))
883 goto nla_put_failure;
884
885 tcf_tm_dump(&t, &c->tcf_tm);
886 if (nla_put_64bit(skb, TCA_CT_TM, sizeof(t), &t, TCA_CT_PAD))
887 goto nla_put_failure;
888 spin_unlock_bh(&c->tcf_lock);
889
890 return skb->len;
891 nla_put_failure:
892 spin_unlock_bh(&c->tcf_lock);
893 nlmsg_trim(skb, b);
894 return -1;
895 }
896
897 static int tcf_ct_walker(struct net *net, struct sk_buff *skb,
898 struct netlink_callback *cb, int type,
899 const struct tc_action_ops *ops,
900 struct netlink_ext_ack *extack)
901 {
902 struct tc_action_net *tn = net_generic(net, ct_net_id);
903
904 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
905 }
906
907 static int tcf_ct_search(struct net *net, struct tc_action **a, u32 index)
908 {
909 struct tc_action_net *tn = net_generic(net, ct_net_id);
910
911 return tcf_idr_search(tn, a, index);
912 }
913
914 static void tcf_stats_update(struct tc_action *a, u64 bytes, u32 packets,
915 u64 lastuse, bool hw)
916 {
917 struct tcf_ct *c = to_ct(a);
918
919 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
920
921 if (hw)
922 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
923 bytes, packets);
924 c->tcf_tm.lastuse = max_t(u64, c->tcf_tm.lastuse, lastuse);
925 }
926
927 static struct tc_action_ops act_ct_ops = {
928 .kind = "ct",
929 .id = TCA_ID_CT,
930 .owner = THIS_MODULE,
931 .act = tcf_ct_act,
932 .dump = tcf_ct_dump,
933 .init = tcf_ct_init,
934 .cleanup = tcf_ct_cleanup,
935 .walk = tcf_ct_walker,
936 .lookup = tcf_ct_search,
937 .stats_update = tcf_stats_update,
938 .size = sizeof(struct tcf_ct),
939 };
940
941 static __net_init int ct_init_net(struct net *net)
942 {
943 unsigned int n_bits = FIELD_SIZEOF(struct tcf_ct_params, labels) * 8;
944 struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
945
946 if (nf_connlabels_get(net, n_bits - 1)) {
947 tn->labels = false;
948 pr_err("act_ct: Failed to set connlabels length");
949 } else {
950 tn->labels = true;
951 }
952
953 return tc_action_net_init(net, &tn->tn, &act_ct_ops);
954 }
955
956 static void __net_exit ct_exit_net(struct list_head *net_list)
957 {
958 struct net *net;
959
960 rtnl_lock();
961 list_for_each_entry(net, net_list, exit_list) {
962 struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
963
964 if (tn->labels)
965 nf_connlabels_put(net);
966 }
967 rtnl_unlock();
968
969 tc_action_net_exit(net_list, ct_net_id);
970 }
971
972 static struct pernet_operations ct_net_ops = {
973 .init = ct_init_net,
974 .exit_batch = ct_exit_net,
975 .id = &ct_net_id,
976 .size = sizeof(struct tc_ct_action_net),
977 };
978
979 static int __init ct_init_module(void)
980 {
981 return tcf_register_action(&act_ct_ops, &ct_net_ops);
982 }
983
984 static void __exit ct_cleanup_module(void)
985 {
986 tcf_unregister_action(&act_ct_ops, &ct_net_ops);
987 }
988
989 module_init(ct_init_module);
990 module_exit(ct_cleanup_module);
991 MODULE_AUTHOR("Paul Blakey <paulb@mellanox.com>");
992 MODULE_AUTHOR("Yossi Kuperman <yossiku@mellanox.com>");
993 MODULE_AUTHOR("Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>");
994 MODULE_DESCRIPTION("Connection tracking action");
995 MODULE_LICENSE("GPL v2");
996
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