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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
34static struct tc_action_ops act_ct_ops;
35static unsigned int ct_net_id;
36
37struct 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. */
43static 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 */
77static 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
99static 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
117static 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
131static 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
151static 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
200out_free:
201 kfree_skb(skb);
202 return err;
203}
204
205static 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(¶ms->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 */
220static 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);
288out:
289 return err;
290}
291#endif /* CONFIG_NF_NAT */
292
293static 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
310static 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
324static 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 enum nf_nat_manip_type maniptype;
333
334 if (!(ct_action & TCA_CT_ACT_NAT))
335 return NF_ACCEPT;
336
337 /* Add NAT extension if not confirmed yet. */
338 if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
339 return NF_DROP; /* Can't NAT. */
340
341 if (ctinfo != IP_CT_NEW && (ct->status & IPS_NAT_MASK) &&
342 (ctinfo != IP_CT_RELATED || commit)) {
343 /* NAT an established or related connection like before. */
344 if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY)
345 /* This is the REPLY direction for a connection
346 * for which NAT was applied in the forward
347 * direction. Do the reverse NAT.
348 */
349 maniptype = ct->status & IPS_SRC_NAT
350 ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC;
351 else
352 maniptype = ct->status & IPS_SRC_NAT
353 ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST;
354 } else if (ct_action & TCA_CT_ACT_NAT_SRC) {
355 maniptype = NF_NAT_MANIP_SRC;
356 } else if (ct_action & TCA_CT_ACT_NAT_DST) {
357 maniptype = NF_NAT_MANIP_DST;
358 } else {
359 return NF_ACCEPT;
360 }
361
362 return ct_nat_execute(skb, ct, ctinfo, range, maniptype);
363#else
364 return NF_ACCEPT;
365#endif
366}
367
368static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
369 struct tcf_result *res)
370{
371 struct net *net = dev_net(skb->dev);
372 bool cached, commit, clear, force;
373 enum ip_conntrack_info ctinfo;
374 struct tcf_ct *c = to_ct(a);
375 struct nf_conn *tmpl = NULL;
376 struct nf_hook_state state;
377 int nh_ofs, err, retval;
378 struct tcf_ct_params *p;
379 struct nf_conn *ct;
380 u8 family;
381
382 p = rcu_dereference_bh(c->params);
383
384 retval = READ_ONCE(c->tcf_action);
385 commit = p->ct_action & TCA_CT_ACT_COMMIT;
386 clear = p->ct_action & TCA_CT_ACT_CLEAR;
387 force = p->ct_action & TCA_CT_ACT_FORCE;
388 tmpl = p->tmpl;
389
390 if (clear) {
391 ct = nf_ct_get(skb, &ctinfo);
392 if (ct) {
393 nf_conntrack_put(&ct->ct_general);
394 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
395 }
396
397 goto out;
398 }
399
400 family = tcf_ct_skb_nf_family(skb);
401 if (family == NFPROTO_UNSPEC)
402 goto drop;
403
404 /* The conntrack module expects to be working at L3.
405 * We also try to pull the IPv4/6 header to linear area
406 */
407 nh_ofs = skb_network_offset(skb);
408 skb_pull_rcsum(skb, nh_ofs);
409 err = tcf_ct_handle_fragments(net, skb, family, p->zone);
410 if (err == -EINPROGRESS) {
411 retval = TC_ACT_STOLEN;
412 goto out;
413 }
414 if (err)
415 goto drop;
416
417 err = tcf_ct_skb_network_trim(skb, family);
418 if (err)
419 goto drop;
420
421 /* If we are recirculating packets to match on ct fields and
422 * committing with a separate ct action, then we don't need to
423 * actually run the packet through conntrack twice unless it's for a
424 * different zone.
425 */
426 cached = tcf_ct_skb_nfct_cached(net, skb, p->zone, force);
427 if (!cached) {
428 /* Associate skb with specified zone. */
429 if (tmpl) {
430 ct = nf_ct_get(skb, &ctinfo);
431 if (skb_nfct(skb))
432 nf_conntrack_put(skb_nfct(skb));
433 nf_conntrack_get(&tmpl->ct_general);
434 nf_ct_set(skb, tmpl, IP_CT_NEW);
435 }
436
437 state.hook = NF_INET_PRE_ROUTING;
438 state.net = net;
439 state.pf = family;
440 err = nf_conntrack_in(skb, &state);
441 if (err != NF_ACCEPT)
442 goto out_push;
443 }
444
445 ct = nf_ct_get(skb, &ctinfo);
446 if (!ct)
447 goto out_push;
448 nf_ct_deliver_cached_events(ct);
449
450 err = tcf_ct_act_nat(skb, ct, ctinfo, p->ct_action, &p->range, commit);
451 if (err != NF_ACCEPT)
452 goto drop;
453
454 if (commit) {
455 tcf_ct_act_set_mark(ct, p->mark, p->mark_mask);
456 tcf_ct_act_set_labels(ct, p->labels, p->labels_mask);
457
458 /* This will take care of sending queued events
459 * even if the connection is already confirmed.
460 */
461 nf_conntrack_confirm(skb);
462 }
463
464out_push:
465 skb_push_rcsum(skb, nh_ofs);
466
467out:
468 bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), skb);
469 return retval;
470
471drop:
472 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats));
473 return TC_ACT_SHOT;
474}
475
476static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
477 [TCA_CT_UNSPEC] = { .strict_start_type = TCA_CT_UNSPEC + 1 },
478 [TCA_CT_ACTION] = { .type = NLA_U16 },
479 [TCA_CT_PARMS] = { .type = NLA_EXACT_LEN, .len = sizeof(struct tc_ct) },
480 [TCA_CT_ZONE] = { .type = NLA_U16 },
481 [TCA_CT_MARK] = { .type = NLA_U32 },
482 [TCA_CT_MARK_MASK] = { .type = NLA_U32 },
483 [TCA_CT_LABELS] = { .type = NLA_BINARY,
484 .len = 128 / BITS_PER_BYTE },
485 [TCA_CT_LABELS_MASK] = { .type = NLA_BINARY,
486 .len = 128 / BITS_PER_BYTE },
487 [TCA_CT_NAT_IPV4_MIN] = { .type = NLA_U32 },
488 [TCA_CT_NAT_IPV4_MAX] = { .type = NLA_U32 },
489 [TCA_CT_NAT_IPV6_MIN] = { .type = NLA_EXACT_LEN,
490 .len = sizeof(struct in6_addr) },
491 [TCA_CT_NAT_IPV6_MAX] = { .type = NLA_EXACT_LEN,
492 .len = sizeof(struct in6_addr) },
493 [TCA_CT_NAT_PORT_MIN] = { .type = NLA_U16 },
494 [TCA_CT_NAT_PORT_MAX] = { .type = NLA_U16 },
495};
496
497static int tcf_ct_fill_params_nat(struct tcf_ct_params *p,
498 struct tc_ct *parm,
499 struct nlattr **tb,
500 struct netlink_ext_ack *extack)
501{
502 struct nf_nat_range2 *range;
503
504 if (!(p->ct_action & TCA_CT_ACT_NAT))
505 return 0;
506
507 if (!IS_ENABLED(CONFIG_NF_NAT)) {
508 NL_SET_ERR_MSG_MOD(extack, "Netfilter nat isn't enabled in kernel");
509 return -EOPNOTSUPP;
510 }
511
512 if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
513 return 0;
514
515 if ((p->ct_action & TCA_CT_ACT_NAT_SRC) &&
516 (p->ct_action & TCA_CT_ACT_NAT_DST)) {
517 NL_SET_ERR_MSG_MOD(extack, "dnat and snat can't be enabled at the same time");
518 return -EOPNOTSUPP;
519 }
520
521 range = &p->range;
522 if (tb[TCA_CT_NAT_IPV4_MIN]) {
523 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV4_MAX];
524
525 p->ipv4_range = true;
526 range->flags |= NF_NAT_RANGE_MAP_IPS;
527 range->min_addr.ip =
528 nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MIN]);
529
530 range->max_addr.ip = max_attr ?
531 nla_get_in_addr(max_attr) :
532 range->min_addr.ip;
533 } else if (tb[TCA_CT_NAT_IPV6_MIN]) {
534 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV6_MAX];
535
536 p->ipv4_range = false;
537 range->flags |= NF_NAT_RANGE_MAP_IPS;
538 range->min_addr.in6 =
539 nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MIN]);
540
541 range->max_addr.in6 = max_attr ?
542 nla_get_in6_addr(max_attr) :
543 range->min_addr.in6;
544 }
545
546 if (tb[TCA_CT_NAT_PORT_MIN]) {
547 range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
548 range->min_proto.all = nla_get_be16(tb[TCA_CT_NAT_PORT_MIN]);
549
550 range->max_proto.all = tb[TCA_CT_NAT_PORT_MAX] ?
551 nla_get_be16(tb[TCA_CT_NAT_PORT_MAX]) :
552 range->min_proto.all;
553 }
554
555 return 0;
556}
557
558static void tcf_ct_set_key_val(struct nlattr **tb,
559 void *val, int val_type,
560 void *mask, int mask_type,
561 int len)
562{
563 if (!tb[val_type])
564 return;
565 nla_memcpy(val, tb[val_type], len);
566
567 if (!mask)
568 return;
569
570 if (mask_type == TCA_CT_UNSPEC || !tb[mask_type])
571 memset(mask, 0xff, len);
572 else
573 nla_memcpy(mask, tb[mask_type], len);
574}
575
576static int tcf_ct_fill_params(struct net *net,
577 struct tcf_ct_params *p,
578 struct tc_ct *parm,
579 struct nlattr **tb,
580 struct netlink_ext_ack *extack)
581{
582 struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
583 struct nf_conntrack_zone zone;
584 struct nf_conn *tmpl;
585 int err;
586
587 p->zone = NF_CT_DEFAULT_ZONE_ID;
588
589 tcf_ct_set_key_val(tb,
590 &p->ct_action, TCA_CT_ACTION,
591 NULL, TCA_CT_UNSPEC,
592 sizeof(p->ct_action));
593
594 if (p->ct_action & TCA_CT_ACT_CLEAR)
595 return 0;
596
597 err = tcf_ct_fill_params_nat(p, parm, tb, extack);
598 if (err)
599 return err;
600
601 if (tb[TCA_CT_MARK]) {
602 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)) {
603 NL_SET_ERR_MSG_MOD(extack, "Conntrack mark isn't enabled.");
604 return -EOPNOTSUPP;
605 }
606 tcf_ct_set_key_val(tb,
607 &p->mark, TCA_CT_MARK,
608 &p->mark_mask, TCA_CT_MARK_MASK,
609 sizeof(p->mark));
610 }
611
612 if (tb[TCA_CT_LABELS]) {
613 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) {
614 NL_SET_ERR_MSG_MOD(extack, "Conntrack labels isn't enabled.");
615 return -EOPNOTSUPP;
616 }
617
618 if (!tn->labels) {
619 NL_SET_ERR_MSG_MOD(extack, "Failed to set connlabel length");
620 return -EOPNOTSUPP;
621 }
622 tcf_ct_set_key_val(tb,
623 p->labels, TCA_CT_LABELS,
624 p->labels_mask, TCA_CT_LABELS_MASK,
625 sizeof(p->labels));
626 }
627
628 if (tb[TCA_CT_ZONE]) {
629 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)) {
630 NL_SET_ERR_MSG_MOD(extack, "Conntrack zones isn't enabled.");
631 return -EOPNOTSUPP;
632 }
633
634 tcf_ct_set_key_val(tb,
635 &p->zone, TCA_CT_ZONE,
636 NULL, TCA_CT_UNSPEC,
637 sizeof(p->zone));
638 }
639
640 if (p->zone == NF_CT_DEFAULT_ZONE_ID)
641 return 0;
642
643 nf_ct_zone_init(&zone, p->zone, NF_CT_DEFAULT_ZONE_DIR, 0);
644 tmpl = nf_ct_tmpl_alloc(net, &zone, GFP_KERNEL);
645 if (!tmpl) {
646 NL_SET_ERR_MSG_MOD(extack, "Failed to allocate conntrack template");
647 return -ENOMEM;
648 }
649 __set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
650 nf_conntrack_get(&tmpl->ct_general);
651 p->tmpl = tmpl;
652
653 return 0;
654}
655
656static int tcf_ct_init(struct net *net, struct nlattr *nla,
657 struct nlattr *est, struct tc_action **a,
658 int replace, int bind, bool rtnl_held,
659 struct tcf_proto *tp,
660 struct netlink_ext_ack *extack)
661{
662 struct tc_action_net *tn = net_generic(net, ct_net_id);
663 struct tcf_ct_params *params = NULL;
664 struct nlattr *tb[TCA_CT_MAX + 1];
665 struct tcf_chain *goto_ch = NULL;
666 struct tc_ct *parm;
667 struct tcf_ct *c;
668 int err, res = 0;
669 u32 index;
670
671 if (!nla) {
672 NL_SET_ERR_MSG_MOD(extack, "Ct requires attributes to be passed");
673 return -EINVAL;
674 }
675
676 err = nla_parse_nested(tb, TCA_CT_MAX, nla, ct_policy, extack);
677 if (err < 0)
678 return err;
679
680 if (!tb[TCA_CT_PARMS]) {
681 NL_SET_ERR_MSG_MOD(extack, "Missing required ct parameters");
682 return -EINVAL;
683 }
684 parm = nla_data(tb[TCA_CT_PARMS]);
685 index = parm->index;
686 err = tcf_idr_check_alloc(tn, &index, a, bind);
687 if (err < 0)
688 return err;
689
690 if (!err) {
691 err = tcf_idr_create(tn, index, est, a,
692 &act_ct_ops, bind, true);
693 if (err) {
694 tcf_idr_cleanup(tn, index);
695 return err;
696 }
697 res = ACT_P_CREATED;
698 } else {
699 if (bind)
700 return 0;
701
702 if (!replace) {
703 tcf_idr_release(*a, bind);
704 return -EEXIST;
705 }
706 }
707 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
708 if (err < 0)
709 goto cleanup;
710
711 c = to_ct(*a);
712
713 params = kzalloc(sizeof(*params), GFP_KERNEL);
714 if (unlikely(!params)) {
715 err = -ENOMEM;
716 goto cleanup;
717 }
718
719 err = tcf_ct_fill_params(net, params, parm, tb, extack);
720 if (err)
721 goto cleanup;
722
723 spin_lock_bh(&c->tcf_lock);
724 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
725 rcu_swap_protected(c->params, params, lockdep_is_held(&c->tcf_lock));
726 spin_unlock_bh(&c->tcf_lock);
727
728 if (goto_ch)
729 tcf_chain_put_by_act(goto_ch);
730 if (params)
731 kfree_rcu(params, rcu);
732 if (res == ACT_P_CREATED)
733 tcf_idr_insert(tn, *a);
734
735 return res;
736
737cleanup:
738 if (goto_ch)
739 tcf_chain_put_by_act(goto_ch);
740 kfree(params);
741 tcf_idr_release(*a, bind);
742 return err;
743}
744
745static void tcf_ct_cleanup(struct tc_action *a)
746{
747 struct tcf_ct_params *params;
748 struct tcf_ct *c = to_ct(a);
749
750 params = rcu_dereference_protected(c->params, 1);
751 if (params)
752 call_rcu(¶ms->rcu, tcf_ct_params_free);
753}
754
755static int tcf_ct_dump_key_val(struct sk_buff *skb,
756 void *val, int val_type,
757 void *mask, int mask_type,
758 int len)
759{
760 int err;
761
762 if (mask && !memchr_inv(mask, 0, len))
763 return 0;
764
765 err = nla_put(skb, val_type, len, val);
766 if (err)
767 return err;
768
769 if (mask_type != TCA_CT_UNSPEC) {
770 err = nla_put(skb, mask_type, len, mask);
771 if (err)
772 return err;
773 }
774
775 return 0;
776}
777
778static int tcf_ct_dump_nat(struct sk_buff *skb, struct tcf_ct_params *p)
779{
780 struct nf_nat_range2 *range = &p->range;
781
782 if (!(p->ct_action & TCA_CT_ACT_NAT))
783 return 0;
784
785 if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
786 return 0;
787
788 if (range->flags & NF_NAT_RANGE_MAP_IPS) {
789 if (p->ipv4_range) {
790 if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MIN,
791 range->min_addr.ip))
792 return -1;
793 if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MAX,
794 range->max_addr.ip))
795 return -1;
796 } else {
797 if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MIN,
798 &range->min_addr.in6))
799 return -1;
800 if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MAX,
801 &range->max_addr.in6))
802 return -1;
803 }
804 }
805
806 if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
807 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MIN,
808 range->min_proto.all))
809 return -1;
810 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MAX,
811 range->max_proto.all))
812 return -1;
813 }
814
815 return 0;
816}
817
818static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a,
819 int bind, int ref)
820{
821 unsigned char *b = skb_tail_pointer(skb);
822 struct tcf_ct *c = to_ct(a);
823 struct tcf_ct_params *p;
824
825 struct tc_ct opt = {
826 .index = c->tcf_index,
827 .refcnt = refcount_read(&c->tcf_refcnt) - ref,
828 .bindcnt = atomic_read(&c->tcf_bindcnt) - bind,
829 };
830 struct tcf_t t;
831
832 spin_lock_bh(&c->tcf_lock);
833 p = rcu_dereference_protected(c->params,
834 lockdep_is_held(&c->tcf_lock));
835 opt.action = c->tcf_action;
836
837 if (tcf_ct_dump_key_val(skb,
838 &p->ct_action, TCA_CT_ACTION,
839 NULL, TCA_CT_UNSPEC,
840 sizeof(p->ct_action)))
841 goto nla_put_failure;
842
843 if (p->ct_action & TCA_CT_ACT_CLEAR)
844 goto skip_dump;
845
846 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
847 tcf_ct_dump_key_val(skb,
848 &p->mark, TCA_CT_MARK,
849 &p->mark_mask, TCA_CT_MARK_MASK,
850 sizeof(p->mark)))
851 goto nla_put_failure;
852
853 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
854 tcf_ct_dump_key_val(skb,
855 p->labels, TCA_CT_LABELS,
856 p->labels_mask, TCA_CT_LABELS_MASK,
857 sizeof(p->labels)))
858 goto nla_put_failure;
859
860 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
861 tcf_ct_dump_key_val(skb,
862 &p->zone, TCA_CT_ZONE,
863 NULL, TCA_CT_UNSPEC,
864 sizeof(p->zone)))
865 goto nla_put_failure;
866
867 if (tcf_ct_dump_nat(skb, p))
868 goto nla_put_failure;
869
870skip_dump:
871 if (nla_put(skb, TCA_CT_PARMS, sizeof(opt), &opt))
872 goto nla_put_failure;
873
874 tcf_tm_dump(&t, &c->tcf_tm);
875 if (nla_put_64bit(skb, TCA_CT_TM, sizeof(t), &t, TCA_CT_PAD))
876 goto nla_put_failure;
877 spin_unlock_bh(&c->tcf_lock);
878
879 return skb->len;
880nla_put_failure:
881 spin_unlock_bh(&c->tcf_lock);
882 nlmsg_trim(skb, b);
883 return -1;
884}
885
886static int tcf_ct_walker(struct net *net, struct sk_buff *skb,
887 struct netlink_callback *cb, int type,
888 const struct tc_action_ops *ops,
889 struct netlink_ext_ack *extack)
890{
891 struct tc_action_net *tn = net_generic(net, ct_net_id);
892
893 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
894}
895
896static int tcf_ct_search(struct net *net, struct tc_action **a, u32 index)
897{
898 struct tc_action_net *tn = net_generic(net, ct_net_id);
899
900 return tcf_idr_search(tn, a, index);
901}
902
903static void tcf_stats_update(struct tc_action *a, u64 bytes, u32 packets,
904 u64 lastuse, bool hw)
905{
906 struct tcf_ct *c = to_ct(a);
907
908 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
909
910 if (hw)
911 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
912 bytes, packets);
913 c->tcf_tm.lastuse = max_t(u64, c->tcf_tm.lastuse, lastuse);
914}
915
916static struct tc_action_ops act_ct_ops = {
917 .kind = "ct",
918 .id = TCA_ID_CT,
919 .owner = THIS_MODULE,
920 .act = tcf_ct_act,
921 .dump = tcf_ct_dump,
922 .init = tcf_ct_init,
923 .cleanup = tcf_ct_cleanup,
924 .walk = tcf_ct_walker,
925 .lookup = tcf_ct_search,
926 .stats_update = tcf_stats_update,
927 .size = sizeof(struct tcf_ct),
928};
929
930static __net_init int ct_init_net(struct net *net)
931{
932 unsigned int n_bits = FIELD_SIZEOF(struct tcf_ct_params, labels) * 8;
933 struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
934
935 if (nf_connlabels_get(net, n_bits - 1)) {
936 tn->labels = false;
937 pr_err("act_ct: Failed to set connlabels length");
938 } else {
939 tn->labels = true;
940 }
941
942 return tc_action_net_init(net, &tn->tn, &act_ct_ops);
943}
944
945static void __net_exit ct_exit_net(struct list_head *net_list)
946{
947 struct net *net;
948
949 rtnl_lock();
950 list_for_each_entry(net, net_list, exit_list) {
951 struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
952
953 if (tn->labels)
954 nf_connlabels_put(net);
955 }
956 rtnl_unlock();
957
958 tc_action_net_exit(net_list, ct_net_id);
959}
960
961static struct pernet_operations ct_net_ops = {
962 .init = ct_init_net,
963 .exit_batch = ct_exit_net,
964 .id = &ct_net_id,
965 .size = sizeof(struct tc_ct_action_net),
966};
967
968static int __init ct_init_module(void)
969{
970 return tcf_register_action(&act_ct_ops, &ct_net_ops);
971}
972
973static void __exit ct_cleanup_module(void)
974{
975 tcf_unregister_action(&act_ct_ops, &ct_net_ops);
976}
977
978module_init(ct_init_module);
979module_exit(ct_cleanup_module);
980MODULE_AUTHOR("Paul Blakey <paulb@mellanox.com>");
981MODULE_AUTHOR("Yossi Kuperman <yossiku@mellanox.com>");
982MODULE_AUTHOR("Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>");
983MODULE_DESCRIPTION("Connection tracking action");
984MODULE_LICENSE("GPL v2");
985