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15#include <linux/types.h>
16#include <linux/skbuff.h>
17#include <linux/net.h>
18#include <linux/module.h>
19#include <net/ip.h>
20#include <net/lwtunnel.h>
21#include <net/netevent.h>
22#include <net/netns/generic.h>
23#include <net/ip6_fib.h>
24#include <net/route.h>
25#include <net/seg6.h>
26#include <linux/seg6.h>
27#include <linux/seg6_local.h>
28#include <net/addrconf.h>
29#include <net/ip6_route.h>
30#include <net/dst_cache.h>
31#ifdef CONFIG_IPV6_SEG6_HMAC
32#include <net/seg6_hmac.h>
33#endif
34#include <net/seg6_local.h>
35#include <linux/etherdevice.h>
36#include <linux/bpf.h>
37
38struct seg6_local_lwt;
39
40struct seg6_action_desc {
41 int action;
42 unsigned long attrs;
43 int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
44 int static_headroom;
45};
46
47struct bpf_lwt_prog {
48 struct bpf_prog *prog;
49 char *name;
50};
51
52struct seg6_local_lwt {
53 int action;
54 struct ipv6_sr_hdr *srh;
55 int table;
56 struct in_addr nh4;
57 struct in6_addr nh6;
58 int iif;
59 int oif;
60 struct bpf_lwt_prog bpf;
61
62 int headroom;
63 struct seg6_action_desc *desc;
64};
65
66static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt)
67{
68 return (struct seg6_local_lwt *)lwt->data;
69}
70
71static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb)
72{
73 struct ipv6_sr_hdr *srh;
74 int len, srhoff = 0;
75
76 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
77 return NULL;
78
79 if (!pskb_may_pull(skb, srhoff + sizeof(*srh)))
80 return NULL;
81
82 srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
83
84 len = (srh->hdrlen + 1) << 3;
85
86 if (!pskb_may_pull(skb, srhoff + len))
87 return NULL;
88
89 if (!seg6_validate_srh(srh, len))
90 return NULL;
91
92 return srh;
93}
94
95static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb)
96{
97 struct ipv6_sr_hdr *srh;
98
99 srh = get_srh(skb);
100 if (!srh)
101 return NULL;
102
103 if (srh->segments_left == 0)
104 return NULL;
105
106#ifdef CONFIG_IPV6_SEG6_HMAC
107 if (!seg6_hmac_validate_skb(skb))
108 return NULL;
109#endif
110
111 return srh;
112}
113
114static bool decap_and_validate(struct sk_buff *skb, int proto)
115{
116 struct ipv6_sr_hdr *srh;
117 unsigned int off = 0;
118
119 srh = get_srh(skb);
120 if (srh && srh->segments_left > 0)
121 return false;
122
123#ifdef CONFIG_IPV6_SEG6_HMAC
124 if (srh && !seg6_hmac_validate_skb(skb))
125 return false;
126#endif
127
128 if (ipv6_find_hdr(skb, &off, proto, NULL, NULL) < 0)
129 return false;
130
131 if (!pskb_pull(skb, off))
132 return false;
133
134 skb_postpull_rcsum(skb, skb_network_header(skb), off);
135
136 skb_reset_network_header(skb);
137 skb_reset_transport_header(skb);
138 skb->encapsulation = 0;
139
140 return true;
141}
142
143static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr)
144{
145 struct in6_addr *addr;
146
147 srh->segments_left--;
148 addr = srh->segments + srh->segments_left;
149 *daddr = *addr;
150}
151
152int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
153 u32 tbl_id)
154{
155 struct net *net = dev_net(skb->dev);
156 struct ipv6hdr *hdr = ipv6_hdr(skb);
157 int flags = RT6_LOOKUP_F_HAS_SADDR;
158 struct dst_entry *dst = NULL;
159 struct rt6_info *rt;
160 struct flowi6 fl6;
161
162 fl6.flowi6_iif = skb->dev->ifindex;
163 fl6.daddr = nhaddr ? *nhaddr : hdr->daddr;
164 fl6.saddr = hdr->saddr;
165 fl6.flowlabel = ip6_flowinfo(hdr);
166 fl6.flowi6_mark = skb->mark;
167 fl6.flowi6_proto = hdr->nexthdr;
168
169 if (nhaddr)
170 fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH;
171
172 if (!tbl_id) {
173 dst = ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags);
174 } else {
175 struct fib6_table *table;
176
177 table = fib6_get_table(net, tbl_id);
178 if (!table)
179 goto out;
180
181 rt = ip6_pol_route(net, table, 0, &fl6, skb, flags);
182 dst = &rt->dst;
183 }
184
185 if (dst && dst->dev->flags & IFF_LOOPBACK && !dst->error) {
186 dst_release(dst);
187 dst = NULL;
188 }
189
190out:
191 if (!dst) {
192 rt = net->ipv6.ip6_blk_hole_entry;
193 dst = &rt->dst;
194 dst_hold(dst);
195 }
196
197 skb_dst_drop(skb);
198 skb_dst_set(skb, dst);
199 return dst->error;
200}
201
202
203static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt)
204{
205 struct ipv6_sr_hdr *srh;
206
207 srh = get_and_validate_srh(skb);
208 if (!srh)
209 goto drop;
210
211 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
212
213 seg6_lookup_nexthop(skb, NULL, 0);
214
215 return dst_input(skb);
216
217drop:
218 kfree_skb(skb);
219 return -EINVAL;
220}
221
222
223static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt)
224{
225 struct ipv6_sr_hdr *srh;
226
227 srh = get_and_validate_srh(skb);
228 if (!srh)
229 goto drop;
230
231 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
232
233 seg6_lookup_nexthop(skb, &slwt->nh6, 0);
234
235 return dst_input(skb);
236
237drop:
238 kfree_skb(skb);
239 return -EINVAL;
240}
241
242static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt)
243{
244 struct ipv6_sr_hdr *srh;
245
246 srh = get_and_validate_srh(skb);
247 if (!srh)
248 goto drop;
249
250 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
251
252 seg6_lookup_nexthop(skb, NULL, slwt->table);
253
254 return dst_input(skb);
255
256drop:
257 kfree_skb(skb);
258 return -EINVAL;
259}
260
261
262static int input_action_end_dx2(struct sk_buff *skb,
263 struct seg6_local_lwt *slwt)
264{
265 struct net *net = dev_net(skb->dev);
266 struct net_device *odev;
267 struct ethhdr *eth;
268
269 if (!decap_and_validate(skb, NEXTHDR_NONE))
270 goto drop;
271
272 if (!pskb_may_pull(skb, ETH_HLEN))
273 goto drop;
274
275 skb_reset_mac_header(skb);
276 eth = (struct ethhdr *)skb->data;
277
278
279
280
281
282 if (!eth_proto_is_802_3(eth->h_proto))
283 goto drop;
284
285 odev = dev_get_by_index_rcu(net, slwt->oif);
286 if (!odev)
287 goto drop;
288
289
290
291
292 if (odev->type != ARPHRD_ETHER)
293 goto drop;
294
295 if (!(odev->flags & IFF_UP) || !netif_carrier_ok(odev))
296 goto drop;
297
298 skb_orphan(skb);
299
300 if (skb_warn_if_lro(skb))
301 goto drop;
302
303 skb_forward_csum(skb);
304
305 if (skb->len - ETH_HLEN > odev->mtu)
306 goto drop;
307
308 skb->dev = odev;
309 skb->protocol = eth->h_proto;
310
311 return dev_queue_xmit(skb);
312
313drop:
314 kfree_skb(skb);
315 return -EINVAL;
316}
317
318
319static int input_action_end_dx6(struct sk_buff *skb,
320 struct seg6_local_lwt *slwt)
321{
322 struct in6_addr *nhaddr = NULL;
323
324
325
326
327
328 if (!decap_and_validate(skb, IPPROTO_IPV6))
329 goto drop;
330
331 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
332 goto drop;
333
334
335
336
337
338
339
340
341 if (!ipv6_addr_any(&slwt->nh6))
342 nhaddr = &slwt->nh6;
343
344 seg6_lookup_nexthop(skb, nhaddr, 0);
345
346 return dst_input(skb);
347drop:
348 kfree_skb(skb);
349 return -EINVAL;
350}
351
352static int input_action_end_dx4(struct sk_buff *skb,
353 struct seg6_local_lwt *slwt)
354{
355 struct iphdr *iph;
356 __be32 nhaddr;
357 int err;
358
359 if (!decap_and_validate(skb, IPPROTO_IPIP))
360 goto drop;
361
362 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
363 goto drop;
364
365 skb->protocol = htons(ETH_P_IP);
366
367 iph = ip_hdr(skb);
368
369 nhaddr = slwt->nh4.s_addr ?: iph->daddr;
370
371 skb_dst_drop(skb);
372
373 err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);
374 if (err)
375 goto drop;
376
377 return dst_input(skb);
378
379drop:
380 kfree_skb(skb);
381 return -EINVAL;
382}
383
384static int input_action_end_dt6(struct sk_buff *skb,
385 struct seg6_local_lwt *slwt)
386{
387 if (!decap_and_validate(skb, IPPROTO_IPV6))
388 goto drop;
389
390 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
391 goto drop;
392
393 seg6_lookup_nexthop(skb, NULL, slwt->table);
394
395 return dst_input(skb);
396
397drop:
398 kfree_skb(skb);
399 return -EINVAL;
400}
401
402
403static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
404{
405 struct ipv6_sr_hdr *srh;
406 int err = -EINVAL;
407
408 srh = get_and_validate_srh(skb);
409 if (!srh)
410 goto drop;
411
412 err = seg6_do_srh_inline(skb, slwt->srh);
413 if (err)
414 goto drop;
415
416 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
417 skb_set_transport_header(skb, sizeof(struct ipv6hdr));
418
419 seg6_lookup_nexthop(skb, NULL, 0);
420
421 return dst_input(skb);
422
423drop:
424 kfree_skb(skb);
425 return err;
426}
427
428
429static int input_action_end_b6_encap(struct sk_buff *skb,
430 struct seg6_local_lwt *slwt)
431{
432 struct ipv6_sr_hdr *srh;
433 int err = -EINVAL;
434
435 srh = get_and_validate_srh(skb);
436 if (!srh)
437 goto drop;
438
439 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
440
441 skb_reset_inner_headers(skb);
442 skb->encapsulation = 1;
443
444 err = seg6_do_srh_encap(skb, slwt->srh, IPPROTO_IPV6);
445 if (err)
446 goto drop;
447
448 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
449 skb_set_transport_header(skb, sizeof(struct ipv6hdr));
450
451 seg6_lookup_nexthop(skb, NULL, 0);
452
453 return dst_input(skb);
454
455drop:
456 kfree_skb(skb);
457 return err;
458}
459
460DEFINE_PER_CPU(struct seg6_bpf_srh_state, seg6_bpf_srh_states);
461
462static int input_action_end_bpf(struct sk_buff *skb,
463 struct seg6_local_lwt *slwt)
464{
465 struct seg6_bpf_srh_state *srh_state =
466 this_cpu_ptr(&seg6_bpf_srh_states);
467 struct seg6_bpf_srh_state local_srh_state;
468 struct ipv6_sr_hdr *srh;
469 int srhoff = 0;
470 int ret;
471
472 srh = get_and_validate_srh(skb);
473 if (!srh)
474 goto drop;
475 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
476
477
478
479
480 preempt_disable();
481 srh_state->hdrlen = srh->hdrlen << 3;
482 srh_state->valid = 1;
483
484 rcu_read_lock();
485 bpf_compute_data_pointers(skb);
486 ret = bpf_prog_run_save_cb(slwt->bpf.prog, skb);
487 rcu_read_unlock();
488
489 local_srh_state = *srh_state;
490 preempt_enable();
491
492 switch (ret) {
493 case BPF_OK:
494 case BPF_REDIRECT:
495 break;
496 case BPF_DROP:
497 goto drop;
498 default:
499 pr_warn_once("bpf-seg6local: Illegal return value %u\n", ret);
500 goto drop;
501 }
502
503 if (unlikely((local_srh_state.hdrlen & 7) != 0))
504 goto drop;
505
506 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
507 goto drop;
508 srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
509 srh->hdrlen = (u8)(local_srh_state.hdrlen >> 3);
510
511 if (!local_srh_state.valid &&
512 unlikely(!seg6_validate_srh(srh, (srh->hdrlen + 1) << 3)))
513 goto drop;
514
515 if (ret != BPF_REDIRECT)
516 seg6_lookup_nexthop(skb, NULL, 0);
517
518 return dst_input(skb);
519
520drop:
521 kfree_skb(skb);
522 return -EINVAL;
523}
524
525static struct seg6_action_desc seg6_action_table[] = {
526 {
527 .action = SEG6_LOCAL_ACTION_END,
528 .attrs = 0,
529 .input = input_action_end,
530 },
531 {
532 .action = SEG6_LOCAL_ACTION_END_X,
533 .attrs = (1 << SEG6_LOCAL_NH6),
534 .input = input_action_end_x,
535 },
536 {
537 .action = SEG6_LOCAL_ACTION_END_T,
538 .attrs = (1 << SEG6_LOCAL_TABLE),
539 .input = input_action_end_t,
540 },
541 {
542 .action = SEG6_LOCAL_ACTION_END_DX2,
543 .attrs = (1 << SEG6_LOCAL_OIF),
544 .input = input_action_end_dx2,
545 },
546 {
547 .action = SEG6_LOCAL_ACTION_END_DX6,
548 .attrs = (1 << SEG6_LOCAL_NH6),
549 .input = input_action_end_dx6,
550 },
551 {
552 .action = SEG6_LOCAL_ACTION_END_DX4,
553 .attrs = (1 << SEG6_LOCAL_NH4),
554 .input = input_action_end_dx4,
555 },
556 {
557 .action = SEG6_LOCAL_ACTION_END_DT6,
558 .attrs = (1 << SEG6_LOCAL_TABLE),
559 .input = input_action_end_dt6,
560 },
561 {
562 .action = SEG6_LOCAL_ACTION_END_B6,
563 .attrs = (1 << SEG6_LOCAL_SRH),
564 .input = input_action_end_b6,
565 },
566 {
567 .action = SEG6_LOCAL_ACTION_END_B6_ENCAP,
568 .attrs = (1 << SEG6_LOCAL_SRH),
569 .input = input_action_end_b6_encap,
570 .static_headroom = sizeof(struct ipv6hdr),
571 },
572 {
573 .action = SEG6_LOCAL_ACTION_END_BPF,
574 .attrs = (1 << SEG6_LOCAL_BPF),
575 .input = input_action_end_bpf,
576 },
577
578};
579
580static struct seg6_action_desc *__get_action_desc(int action)
581{
582 struct seg6_action_desc *desc;
583 int i, count;
584
585 count = ARRAY_SIZE(seg6_action_table);
586 for (i = 0; i < count; i++) {
587 desc = &seg6_action_table[i];
588 if (desc->action == action)
589 return desc;
590 }
591
592 return NULL;
593}
594
595static int seg6_local_input(struct sk_buff *skb)
596{
597 struct dst_entry *orig_dst = skb_dst(skb);
598 struct seg6_action_desc *desc;
599 struct seg6_local_lwt *slwt;
600
601 if (skb->protocol != htons(ETH_P_IPV6)) {
602 kfree_skb(skb);
603 return -EINVAL;
604 }
605
606 slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
607 desc = slwt->desc;
608
609 return desc->input(skb, slwt);
610}
611
612static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = {
613 [SEG6_LOCAL_ACTION] = { .type = NLA_U32 },
614 [SEG6_LOCAL_SRH] = { .type = NLA_BINARY },
615 [SEG6_LOCAL_TABLE] = { .type = NLA_U32 },
616 [SEG6_LOCAL_NH4] = { .type = NLA_BINARY,
617 .len = sizeof(struct in_addr) },
618 [SEG6_LOCAL_NH6] = { .type = NLA_BINARY,
619 .len = sizeof(struct in6_addr) },
620 [SEG6_LOCAL_IIF] = { .type = NLA_U32 },
621 [SEG6_LOCAL_OIF] = { .type = NLA_U32 },
622 [SEG6_LOCAL_BPF] = { .type = NLA_NESTED },
623};
624
625static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt)
626{
627 struct ipv6_sr_hdr *srh;
628 int len;
629
630 srh = nla_data(attrs[SEG6_LOCAL_SRH]);
631 len = nla_len(attrs[SEG6_LOCAL_SRH]);
632
633
634 if (len < sizeof(*srh) + sizeof(struct in6_addr))
635 return -EINVAL;
636
637 if (!seg6_validate_srh(srh, len))
638 return -EINVAL;
639
640 slwt->srh = kmalloc(len, GFP_KERNEL);
641 if (!slwt->srh)
642 return -ENOMEM;
643
644 memcpy(slwt->srh, srh, len);
645
646 slwt->headroom += len;
647
648 return 0;
649}
650
651static int put_nla_srh(struct sk_buff *skb, struct seg6_local_lwt *slwt)
652{
653 struct ipv6_sr_hdr *srh;
654 struct nlattr *nla;
655 int len;
656
657 srh = slwt->srh;
658 len = (srh->hdrlen + 1) << 3;
659
660 nla = nla_reserve(skb, SEG6_LOCAL_SRH, len);
661 if (!nla)
662 return -EMSGSIZE;
663
664 memcpy(nla_data(nla), srh, len);
665
666 return 0;
667}
668
669static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
670{
671 int len = (a->srh->hdrlen + 1) << 3;
672
673 if (len != ((b->srh->hdrlen + 1) << 3))
674 return 1;
675
676 return memcmp(a->srh, b->srh, len);
677}
678
679static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt)
680{
681 slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]);
682
683 return 0;
684}
685
686static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt)
687{
688 if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table))
689 return -EMSGSIZE;
690
691 return 0;
692}
693
694static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
695{
696 if (a->table != b->table)
697 return 1;
698
699 return 0;
700}
701
702static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt)
703{
704 memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]),
705 sizeof(struct in_addr));
706
707 return 0;
708}
709
710static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt)
711{
712 struct nlattr *nla;
713
714 nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr));
715 if (!nla)
716 return -EMSGSIZE;
717
718 memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr));
719
720 return 0;
721}
722
723static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
724{
725 return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr));
726}
727
728static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt)
729{
730 memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]),
731 sizeof(struct in6_addr));
732
733 return 0;
734}
735
736static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
737{
738 struct nlattr *nla;
739
740 nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr));
741 if (!nla)
742 return -EMSGSIZE;
743
744 memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr));
745
746 return 0;
747}
748
749static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
750{
751 return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr));
752}
753
754static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
755{
756 slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]);
757
758 return 0;
759}
760
761static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
762{
763 if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif))
764 return -EMSGSIZE;
765
766 return 0;
767}
768
769static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
770{
771 if (a->iif != b->iif)
772 return 1;
773
774 return 0;
775}
776
777static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
778{
779 slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]);
780
781 return 0;
782}
783
784static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
785{
786 if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif))
787 return -EMSGSIZE;
788
789 return 0;
790}
791
792static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
793{
794 if (a->oif != b->oif)
795 return 1;
796
797 return 0;
798}
799
800#define MAX_PROG_NAME 256
801static const struct nla_policy bpf_prog_policy[SEG6_LOCAL_BPF_PROG_MAX + 1] = {
802 [SEG6_LOCAL_BPF_PROG] = { .type = NLA_U32, },
803 [SEG6_LOCAL_BPF_PROG_NAME] = { .type = NLA_NUL_STRING,
804 .len = MAX_PROG_NAME },
805};
806
807static int parse_nla_bpf(struct nlattr **attrs, struct seg6_local_lwt *slwt)
808{
809 struct nlattr *tb[SEG6_LOCAL_BPF_PROG_MAX + 1];
810 struct bpf_prog *p;
811 int ret;
812 u32 fd;
813
814 ret = nla_parse_nested(tb, SEG6_LOCAL_BPF_PROG_MAX,
815 attrs[SEG6_LOCAL_BPF], bpf_prog_policy, NULL);
816 if (ret < 0)
817 return ret;
818
819 if (!tb[SEG6_LOCAL_BPF_PROG] || !tb[SEG6_LOCAL_BPF_PROG_NAME])
820 return -EINVAL;
821
822 slwt->bpf.name = nla_memdup(tb[SEG6_LOCAL_BPF_PROG_NAME], GFP_KERNEL);
823 if (!slwt->bpf.name)
824 return -ENOMEM;
825
826 fd = nla_get_u32(tb[SEG6_LOCAL_BPF_PROG]);
827 p = bpf_prog_get_type(fd, BPF_PROG_TYPE_LWT_SEG6LOCAL);
828 if (IS_ERR(p)) {
829 kfree(slwt->bpf.name);
830 return PTR_ERR(p);
831 }
832
833 slwt->bpf.prog = p;
834 return 0;
835}
836
837static int put_nla_bpf(struct sk_buff *skb, struct seg6_local_lwt *slwt)
838{
839 struct nlattr *nest;
840
841 if (!slwt->bpf.prog)
842 return 0;
843
844 nest = nla_nest_start(skb, SEG6_LOCAL_BPF);
845 if (!nest)
846 return -EMSGSIZE;
847
848 if (nla_put_u32(skb, SEG6_LOCAL_BPF_PROG, slwt->bpf.prog->aux->id))
849 return -EMSGSIZE;
850
851 if (slwt->bpf.name &&
852 nla_put_string(skb, SEG6_LOCAL_BPF_PROG_NAME, slwt->bpf.name))
853 return -EMSGSIZE;
854
855 return nla_nest_end(skb, nest);
856}
857
858static int cmp_nla_bpf(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
859{
860 if (!a->bpf.name && !b->bpf.name)
861 return 0;
862
863 if (!a->bpf.name || !b->bpf.name)
864 return 1;
865
866 return strcmp(a->bpf.name, b->bpf.name);
867}
868
869struct seg6_action_param {
870 int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt);
871 int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
872 int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b);
873};
874
875static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = {
876 [SEG6_LOCAL_SRH] = { .parse = parse_nla_srh,
877 .put = put_nla_srh,
878 .cmp = cmp_nla_srh },
879
880 [SEG6_LOCAL_TABLE] = { .parse = parse_nla_table,
881 .put = put_nla_table,
882 .cmp = cmp_nla_table },
883
884 [SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4,
885 .put = put_nla_nh4,
886 .cmp = cmp_nla_nh4 },
887
888 [SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6,
889 .put = put_nla_nh6,
890 .cmp = cmp_nla_nh6 },
891
892 [SEG6_LOCAL_IIF] = { .parse = parse_nla_iif,
893 .put = put_nla_iif,
894 .cmp = cmp_nla_iif },
895
896 [SEG6_LOCAL_OIF] = { .parse = parse_nla_oif,
897 .put = put_nla_oif,
898 .cmp = cmp_nla_oif },
899
900 [SEG6_LOCAL_BPF] = { .parse = parse_nla_bpf,
901 .put = put_nla_bpf,
902 .cmp = cmp_nla_bpf },
903
904};
905
906static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt)
907{
908 struct seg6_action_param *param;
909 struct seg6_action_desc *desc;
910 int i, err;
911
912 desc = __get_action_desc(slwt->action);
913 if (!desc)
914 return -EINVAL;
915
916 if (!desc->input)
917 return -EOPNOTSUPP;
918
919 slwt->desc = desc;
920 slwt->headroom += desc->static_headroom;
921
922 for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
923 if (desc->attrs & (1 << i)) {
924 if (!attrs[i])
925 return -EINVAL;
926
927 param = &seg6_action_params[i];
928
929 err = param->parse(attrs, slwt);
930 if (err < 0)
931 return err;
932 }
933 }
934
935 return 0;
936}
937
938static int seg6_local_build_state(struct nlattr *nla, unsigned int family,
939 const void *cfg, struct lwtunnel_state **ts,
940 struct netlink_ext_ack *extack)
941{
942 struct nlattr *tb[SEG6_LOCAL_MAX + 1];
943 struct lwtunnel_state *newts;
944 struct seg6_local_lwt *slwt;
945 int err;
946
947 if (family != AF_INET6)
948 return -EINVAL;
949
950 err = nla_parse_nested(tb, SEG6_LOCAL_MAX, nla, seg6_local_policy,
951 extack);
952
953 if (err < 0)
954 return err;
955
956 if (!tb[SEG6_LOCAL_ACTION])
957 return -EINVAL;
958
959 newts = lwtunnel_state_alloc(sizeof(*slwt));
960 if (!newts)
961 return -ENOMEM;
962
963 slwt = seg6_local_lwtunnel(newts);
964 slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]);
965
966 err = parse_nla_action(tb, slwt);
967 if (err < 0)
968 goto out_free;
969
970 newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL;
971 newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT;
972 newts->headroom = slwt->headroom;
973
974 *ts = newts;
975
976 return 0;
977
978out_free:
979 kfree(slwt->srh);
980 kfree(newts);
981 return err;
982}
983
984static void seg6_local_destroy_state(struct lwtunnel_state *lwt)
985{
986 struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
987
988 kfree(slwt->srh);
989
990 if (slwt->desc->attrs & (1 << SEG6_LOCAL_BPF)) {
991 kfree(slwt->bpf.name);
992 bpf_prog_put(slwt->bpf.prog);
993 }
994
995 return;
996}
997
998static int seg6_local_fill_encap(struct sk_buff *skb,
999 struct lwtunnel_state *lwt)
1000{
1001 struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
1002 struct seg6_action_param *param;
1003 int i, err;
1004
1005 if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action))
1006 return -EMSGSIZE;
1007
1008 for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
1009 if (slwt->desc->attrs & (1 << i)) {
1010 param = &seg6_action_params[i];
1011 err = param->put(skb, slwt);
1012 if (err < 0)
1013 return err;
1014 }
1015 }
1016
1017 return 0;
1018}
1019
1020static int seg6_local_get_encap_size(struct lwtunnel_state *lwt)
1021{
1022 struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
1023 unsigned long attrs;
1024 int nlsize;
1025
1026 nlsize = nla_total_size(4);
1027
1028 attrs = slwt->desc->attrs;
1029
1030 if (attrs & (1 << SEG6_LOCAL_SRH))
1031 nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3);
1032
1033 if (attrs & (1 << SEG6_LOCAL_TABLE))
1034 nlsize += nla_total_size(4);
1035
1036 if (attrs & (1 << SEG6_LOCAL_NH4))
1037 nlsize += nla_total_size(4);
1038
1039 if (attrs & (1 << SEG6_LOCAL_NH6))
1040 nlsize += nla_total_size(16);
1041
1042 if (attrs & (1 << SEG6_LOCAL_IIF))
1043 nlsize += nla_total_size(4);
1044
1045 if (attrs & (1 << SEG6_LOCAL_OIF))
1046 nlsize += nla_total_size(4);
1047
1048 if (attrs & (1 << SEG6_LOCAL_BPF))
1049 nlsize += nla_total_size(sizeof(struct nlattr)) +
1050 nla_total_size(MAX_PROG_NAME) +
1051 nla_total_size(4);
1052
1053 return nlsize;
1054}
1055
1056static int seg6_local_cmp_encap(struct lwtunnel_state *a,
1057 struct lwtunnel_state *b)
1058{
1059 struct seg6_local_lwt *slwt_a, *slwt_b;
1060 struct seg6_action_param *param;
1061 int i;
1062
1063 slwt_a = seg6_local_lwtunnel(a);
1064 slwt_b = seg6_local_lwtunnel(b);
1065
1066 if (slwt_a->action != slwt_b->action)
1067 return 1;
1068
1069 if (slwt_a->desc->attrs != slwt_b->desc->attrs)
1070 return 1;
1071
1072 for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
1073 if (slwt_a->desc->attrs & (1 << i)) {
1074 param = &seg6_action_params[i];
1075 if (param->cmp(slwt_a, slwt_b))
1076 return 1;
1077 }
1078 }
1079
1080 return 0;
1081}
1082
1083static const struct lwtunnel_encap_ops seg6_local_ops = {
1084 .build_state = seg6_local_build_state,
1085 .destroy_state = seg6_local_destroy_state,
1086 .input = seg6_local_input,
1087 .fill_encap = seg6_local_fill_encap,
1088 .get_encap_size = seg6_local_get_encap_size,
1089 .cmp_encap = seg6_local_cmp_encap,
1090 .owner = THIS_MODULE,
1091};
1092
1093int __init seg6_local_init(void)
1094{
1095 return lwtunnel_encap_add_ops(&seg6_local_ops,
1096 LWTUNNEL_ENCAP_SEG6_LOCAL);
1097}
1098
1099void seg6_local_exit(void)
1100{
1101 lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL);
1102}
1103
