1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * SR-IPv6 implementation
6 * David Lebrun <david.lebrun@uclouvain.be>
7 * eBPF support: Mathieu Xhonneux <m.xhonneux@gmail.com>
10 #include <linux/types.h>
11 #include <linux/skbuff.h>
12 #include <linux/net.h>
13 #include <linux/module.h>
15 #include <net/lwtunnel.h>
16 #include <net/netevent.h>
17 #include <net/netns/generic.h>
18 #include <net/ip6_fib.h>
19 #include <net/route.h>
21 #include <linux/seg6.h>
22 #include <linux/seg6_local.h>
23 #include <net/addrconf.h>
24 #include <net/ip6_route.h>
25 #include <net/dst_cache.h>
26 #ifdef CONFIG_IPV6_SEG6_HMAC
27 #include <net/seg6_hmac.h>
29 #include <net/seg6_local.h>
30 #include <linux/etherdevice.h>
31 #include <linux/bpf.h>
33 struct seg6_local_lwt;
35 struct seg6_action_desc {
38 int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
43 struct bpf_prog *prog;
47 struct seg6_local_lwt {
49 struct ipv6_sr_hdr *srh;
55 struct bpf_lwt_prog bpf;
58 struct seg6_action_desc *desc;
61 static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt)
63 return (struct seg6_local_lwt *)lwt->data;
66 static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb)
68 struct ipv6_sr_hdr *srh;
71 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
74 if (!pskb_may_pull(skb, srhoff + sizeof(*srh)))
77 srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
79 len = (srh->hdrlen + 1) << 3;
81 if (!pskb_may_pull(skb, srhoff + len))
84 if (!seg6_validate_srh(srh, len))
90 static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb)
92 struct ipv6_sr_hdr *srh;
98 if (srh->segments_left == 0)
101 #ifdef CONFIG_IPV6_SEG6_HMAC
102 if (!seg6_hmac_validate_skb(skb))
109 static bool decap_and_validate(struct sk_buff *skb, int proto)
111 struct ipv6_sr_hdr *srh;
112 unsigned int off = 0;
115 if (srh && srh->segments_left > 0)
118 #ifdef CONFIG_IPV6_SEG6_HMAC
119 if (srh && !seg6_hmac_validate_skb(skb))
123 if (ipv6_find_hdr(skb, &off, proto, NULL, NULL) < 0)
126 if (!pskb_pull(skb, off))
129 skb_postpull_rcsum(skb, skb_network_header(skb), off);
131 skb_reset_network_header(skb);
132 skb_reset_transport_header(skb);
133 skb->encapsulation = 0;
138 static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr)
140 struct in6_addr *addr;
142 srh->segments_left--;
143 addr = srh->segments + srh->segments_left;
147 int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
150 struct net *net = dev_net(skb->dev);
151 struct ipv6hdr *hdr = ipv6_hdr(skb);
152 int flags = RT6_LOOKUP_F_HAS_SADDR;
153 struct dst_entry *dst = NULL;
157 fl6.flowi6_iif = skb->dev->ifindex;
158 fl6.daddr = nhaddr ? *nhaddr : hdr->daddr;
159 fl6.saddr = hdr->saddr;
160 fl6.flowlabel = ip6_flowinfo(hdr);
161 fl6.flowi6_mark = skb->mark;
162 fl6.flowi6_proto = hdr->nexthdr;
165 fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH;
168 dst = ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags);
170 struct fib6_table *table;
172 table = fib6_get_table(net, tbl_id);
176 rt = ip6_pol_route(net, table, 0, &fl6, skb, flags);
180 if (dst && dst->dev->flags & IFF_LOOPBACK && !dst->error) {
187 rt = net->ipv6.ip6_blk_hole_entry;
193 skb_dst_set(skb, dst);
197 /* regular endpoint function */
198 static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt)
200 struct ipv6_sr_hdr *srh;
202 srh = get_and_validate_srh(skb);
206 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
208 seg6_lookup_nexthop(skb, NULL, 0);
210 return dst_input(skb);
217 /* regular endpoint, and forward to specified nexthop */
218 static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt)
220 struct ipv6_sr_hdr *srh;
222 srh = get_and_validate_srh(skb);
226 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
228 seg6_lookup_nexthop(skb, &slwt->nh6, 0);
230 return dst_input(skb);
237 static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt)
239 struct ipv6_sr_hdr *srh;
241 srh = get_and_validate_srh(skb);
245 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
247 seg6_lookup_nexthop(skb, NULL, slwt->table);
249 return dst_input(skb);
256 /* decapsulate and forward inner L2 frame on specified interface */
257 static int input_action_end_dx2(struct sk_buff *skb,
258 struct seg6_local_lwt *slwt)
260 struct net *net = dev_net(skb->dev);
261 struct net_device *odev;
264 if (!decap_and_validate(skb, NEXTHDR_NONE))
267 if (!pskb_may_pull(skb, ETH_HLEN))
270 skb_reset_mac_header(skb);
271 eth = (struct ethhdr *)skb->data;
273 /* To determine the frame's protocol, we assume it is 802.3. This avoids
274 * a call to eth_type_trans(), which is not really relevant for our
277 if (!eth_proto_is_802_3(eth->h_proto))
280 odev = dev_get_by_index_rcu(net, slwt->oif);
284 /* As we accept Ethernet frames, make sure the egress device is of
287 if (odev->type != ARPHRD_ETHER)
290 if (!(odev->flags & IFF_UP) || !netif_carrier_ok(odev))
295 if (skb_warn_if_lro(skb))
298 skb_forward_csum(skb);
300 if (skb->len - ETH_HLEN > odev->mtu)
304 skb->protocol = eth->h_proto;
306 return dev_queue_xmit(skb);
313 /* decapsulate and forward to specified nexthop */
314 static int input_action_end_dx6(struct sk_buff *skb,
315 struct seg6_local_lwt *slwt)
317 struct in6_addr *nhaddr = NULL;
319 /* this function accepts IPv6 encapsulated packets, with either
320 * an SRH with SL=0, or no SRH.
323 if (!decap_and_validate(skb, IPPROTO_IPV6))
326 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
329 /* The inner packet is not associated to any local interface,
330 * so we do not call netif_rx().
332 * If slwt->nh6 is set to ::, then lookup the nexthop for the
333 * inner packet's DA. Otherwise, use the specified nexthop.
336 if (!ipv6_addr_any(&slwt->nh6))
339 seg6_lookup_nexthop(skb, nhaddr, 0);
341 return dst_input(skb);
347 static int input_action_end_dx4(struct sk_buff *skb,
348 struct seg6_local_lwt *slwt)
354 if (!decap_and_validate(skb, IPPROTO_IPIP))
357 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
360 skb->protocol = htons(ETH_P_IP);
364 nhaddr = slwt->nh4.s_addr ?: iph->daddr;
368 err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);
372 return dst_input(skb);
379 static int input_action_end_dt6(struct sk_buff *skb,
380 struct seg6_local_lwt *slwt)
382 if (!decap_and_validate(skb, IPPROTO_IPV6))
385 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
388 seg6_lookup_nexthop(skb, NULL, slwt->table);
390 return dst_input(skb);
397 /* push an SRH on top of the current one */
398 static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
400 struct ipv6_sr_hdr *srh;
403 srh = get_and_validate_srh(skb);
407 err = seg6_do_srh_inline(skb, slwt->srh);
411 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
412 skb_set_transport_header(skb, sizeof(struct ipv6hdr));
414 seg6_lookup_nexthop(skb, NULL, 0);
416 return dst_input(skb);
423 /* encapsulate within an outer IPv6 header and a specified SRH */
424 static int input_action_end_b6_encap(struct sk_buff *skb,
425 struct seg6_local_lwt *slwt)
427 struct ipv6_sr_hdr *srh;
430 srh = get_and_validate_srh(skb);
434 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
436 skb_reset_inner_headers(skb);
437 skb->encapsulation = 1;
439 err = seg6_do_srh_encap(skb, slwt->srh, IPPROTO_IPV6);
443 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
444 skb_set_transport_header(skb, sizeof(struct ipv6hdr));
446 seg6_lookup_nexthop(skb, NULL, 0);
448 return dst_input(skb);
455 DEFINE_PER_CPU(struct seg6_bpf_srh_state, seg6_bpf_srh_states);
457 bool seg6_bpf_has_valid_srh(struct sk_buff *skb)
459 struct seg6_bpf_srh_state *srh_state =
460 this_cpu_ptr(&seg6_bpf_srh_states);
461 struct ipv6_sr_hdr *srh = srh_state->srh;
463 if (unlikely(srh == NULL))
466 if (unlikely(!srh_state->valid)) {
467 if ((srh_state->hdrlen & 7) != 0)
470 srh->hdrlen = (u8)(srh_state->hdrlen >> 3);
471 if (!seg6_validate_srh(srh, (srh->hdrlen + 1) << 3))
474 srh_state->valid = true;
480 static int input_action_end_bpf(struct sk_buff *skb,
481 struct seg6_local_lwt *slwt)
483 struct seg6_bpf_srh_state *srh_state =
484 this_cpu_ptr(&seg6_bpf_srh_states);
485 struct ipv6_sr_hdr *srh;
488 srh = get_and_validate_srh(skb);
493 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
495 /* preempt_disable is needed to protect the per-CPU buffer srh_state,
496 * which is also accessed by the bpf_lwt_seg6_* helpers
499 srh_state->srh = srh;
500 srh_state->hdrlen = srh->hdrlen << 3;
501 srh_state->valid = true;
504 bpf_compute_data_pointers(skb);
505 ret = bpf_prog_run_save_cb(slwt->bpf.prog, skb);
515 pr_warn_once("bpf-seg6local: Illegal return value %u\n", ret);
519 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
523 if (ret != BPF_REDIRECT)
524 seg6_lookup_nexthop(skb, NULL, 0);
526 return dst_input(skb);
534 static struct seg6_action_desc seg6_action_table[] = {
536 .action = SEG6_LOCAL_ACTION_END,
538 .input = input_action_end,
541 .action = SEG6_LOCAL_ACTION_END_X,
542 .attrs = (1 << SEG6_LOCAL_NH6),
543 .input = input_action_end_x,
546 .action = SEG6_LOCAL_ACTION_END_T,
547 .attrs = (1 << SEG6_LOCAL_TABLE),
548 .input = input_action_end_t,
551 .action = SEG6_LOCAL_ACTION_END_DX2,
552 .attrs = (1 << SEG6_LOCAL_OIF),
553 .input = input_action_end_dx2,
556 .action = SEG6_LOCAL_ACTION_END_DX6,
557 .attrs = (1 << SEG6_LOCAL_NH6),
558 .input = input_action_end_dx6,
561 .action = SEG6_LOCAL_ACTION_END_DX4,
562 .attrs = (1 << SEG6_LOCAL_NH4),
563 .input = input_action_end_dx4,
566 .action = SEG6_LOCAL_ACTION_END_DT6,
567 .attrs = (1 << SEG6_LOCAL_TABLE),
568 .input = input_action_end_dt6,
571 .action = SEG6_LOCAL_ACTION_END_B6,
572 .attrs = (1 << SEG6_LOCAL_SRH),
573 .input = input_action_end_b6,
576 .action = SEG6_LOCAL_ACTION_END_B6_ENCAP,
577 .attrs = (1 << SEG6_LOCAL_SRH),
578 .input = input_action_end_b6_encap,
579 .static_headroom = sizeof(struct ipv6hdr),
582 .action = SEG6_LOCAL_ACTION_END_BPF,
583 .attrs = (1 << SEG6_LOCAL_BPF),
584 .input = input_action_end_bpf,
589 static struct seg6_action_desc *__get_action_desc(int action)
591 struct seg6_action_desc *desc;
594 count = ARRAY_SIZE(seg6_action_table);
595 for (i = 0; i < count; i++) {
596 desc = &seg6_action_table[i];
597 if (desc->action == action)
604 static int seg6_local_input(struct sk_buff *skb)
606 struct dst_entry *orig_dst = skb_dst(skb);
607 struct seg6_action_desc *desc;
608 struct seg6_local_lwt *slwt;
610 if (skb->protocol != htons(ETH_P_IPV6)) {
615 slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
618 return desc->input(skb, slwt);
621 static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = {
622 [SEG6_LOCAL_ACTION] = { .type = NLA_U32 },
623 [SEG6_LOCAL_SRH] = { .type = NLA_BINARY },
624 [SEG6_LOCAL_TABLE] = { .type = NLA_U32 },
625 [SEG6_LOCAL_NH4] = { .type = NLA_BINARY,
626 .len = sizeof(struct in_addr) },
627 [SEG6_LOCAL_NH6] = { .type = NLA_BINARY,
628 .len = sizeof(struct in6_addr) },
629 [SEG6_LOCAL_IIF] = { .type = NLA_U32 },
630 [SEG6_LOCAL_OIF] = { .type = NLA_U32 },
631 [SEG6_LOCAL_BPF] = { .type = NLA_NESTED },
634 static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt)
636 struct ipv6_sr_hdr *srh;
639 srh = nla_data(attrs[SEG6_LOCAL_SRH]);
640 len = nla_len(attrs[SEG6_LOCAL_SRH]);
642 /* SRH must contain at least one segment */
643 if (len < sizeof(*srh) + sizeof(struct in6_addr))
646 if (!seg6_validate_srh(srh, len))
649 slwt->srh = kmemdup(srh, len, GFP_KERNEL);
653 slwt->headroom += len;
658 static int put_nla_srh(struct sk_buff *skb, struct seg6_local_lwt *slwt)
660 struct ipv6_sr_hdr *srh;
665 len = (srh->hdrlen + 1) << 3;
667 nla = nla_reserve(skb, SEG6_LOCAL_SRH, len);
671 memcpy(nla_data(nla), srh, len);
676 static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
678 int len = (a->srh->hdrlen + 1) << 3;
680 if (len != ((b->srh->hdrlen + 1) << 3))
683 return memcmp(a->srh, b->srh, len);
686 static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt)
688 slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]);
693 static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt)
695 if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table))
701 static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
703 if (a->table != b->table)
709 static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt)
711 memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]),
712 sizeof(struct in_addr));
717 static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt)
721 nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr));
725 memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr));
730 static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
732 return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr));
735 static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt)
737 memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]),
738 sizeof(struct in6_addr));
743 static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
747 nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr));
751 memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr));
756 static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
758 return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr));
761 static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
763 slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]);
768 static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
770 if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif))
776 static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
778 if (a->iif != b->iif)
784 static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
786 slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]);
791 static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
793 if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif))
799 static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
801 if (a->oif != b->oif)
807 #define MAX_PROG_NAME 256
808 static const struct nla_policy bpf_prog_policy[SEG6_LOCAL_BPF_PROG_MAX + 1] = {
809 [SEG6_LOCAL_BPF_PROG] = { .type = NLA_U32, },
810 [SEG6_LOCAL_BPF_PROG_NAME] = { .type = NLA_NUL_STRING,
811 .len = MAX_PROG_NAME },
814 static int parse_nla_bpf(struct nlattr **attrs, struct seg6_local_lwt *slwt)
816 struct nlattr *tb[SEG6_LOCAL_BPF_PROG_MAX + 1];
821 ret = nla_parse_nested_deprecated(tb, SEG6_LOCAL_BPF_PROG_MAX,
822 attrs[SEG6_LOCAL_BPF],
823 bpf_prog_policy, NULL);
827 if (!tb[SEG6_LOCAL_BPF_PROG] || !tb[SEG6_LOCAL_BPF_PROG_NAME])
830 slwt->bpf.name = nla_memdup(tb[SEG6_LOCAL_BPF_PROG_NAME], GFP_KERNEL);
834 fd = nla_get_u32(tb[SEG6_LOCAL_BPF_PROG]);
835 p = bpf_prog_get_type(fd, BPF_PROG_TYPE_LWT_SEG6LOCAL);
837 kfree(slwt->bpf.name);
845 static int put_nla_bpf(struct sk_buff *skb, struct seg6_local_lwt *slwt)
852 nest = nla_nest_start_noflag(skb, SEG6_LOCAL_BPF);
856 if (nla_put_u32(skb, SEG6_LOCAL_BPF_PROG, slwt->bpf.prog->aux->id))
859 if (slwt->bpf.name &&
860 nla_put_string(skb, SEG6_LOCAL_BPF_PROG_NAME, slwt->bpf.name))
863 return nla_nest_end(skb, nest);
866 static int cmp_nla_bpf(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
868 if (!a->bpf.name && !b->bpf.name)
871 if (!a->bpf.name || !b->bpf.name)
874 return strcmp(a->bpf.name, b->bpf.name);
877 struct seg6_action_param {
878 int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt);
879 int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
880 int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b);
883 static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = {
884 [SEG6_LOCAL_SRH] = { .parse = parse_nla_srh,
886 .cmp = cmp_nla_srh },
888 [SEG6_LOCAL_TABLE] = { .parse = parse_nla_table,
889 .put = put_nla_table,
890 .cmp = cmp_nla_table },
892 [SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4,
894 .cmp = cmp_nla_nh4 },
896 [SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6,
898 .cmp = cmp_nla_nh6 },
900 [SEG6_LOCAL_IIF] = { .parse = parse_nla_iif,
902 .cmp = cmp_nla_iif },
904 [SEG6_LOCAL_OIF] = { .parse = parse_nla_oif,
906 .cmp = cmp_nla_oif },
908 [SEG6_LOCAL_BPF] = { .parse = parse_nla_bpf,
910 .cmp = cmp_nla_bpf },
914 static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt)
916 struct seg6_action_param *param;
917 struct seg6_action_desc *desc;
920 desc = __get_action_desc(slwt->action);
928 slwt->headroom += desc->static_headroom;
930 for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
931 if (desc->attrs & (1 << i)) {
935 param = &seg6_action_params[i];
937 err = param->parse(attrs, slwt);
946 static int seg6_local_build_state(struct nlattr *nla, unsigned int family,
947 const void *cfg, struct lwtunnel_state **ts,
948 struct netlink_ext_ack *extack)
950 struct nlattr *tb[SEG6_LOCAL_MAX + 1];
951 struct lwtunnel_state *newts;
952 struct seg6_local_lwt *slwt;
955 if (family != AF_INET6)
958 err = nla_parse_nested_deprecated(tb, SEG6_LOCAL_MAX, nla,
959 seg6_local_policy, extack);
964 if (!tb[SEG6_LOCAL_ACTION])
967 newts = lwtunnel_state_alloc(sizeof(*slwt));
971 slwt = seg6_local_lwtunnel(newts);
972 slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]);
974 err = parse_nla_action(tb, slwt);
978 newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL;
979 newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT;
980 newts->headroom = slwt->headroom;
992 static void seg6_local_destroy_state(struct lwtunnel_state *lwt)
994 struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
998 if (slwt->desc->attrs & (1 << SEG6_LOCAL_BPF)) {
999 kfree(slwt->bpf.name);
1000 bpf_prog_put(slwt->bpf.prog);
1006 static int seg6_local_fill_encap(struct sk_buff *skb,
1007 struct lwtunnel_state *lwt)
1009 struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
1010 struct seg6_action_param *param;
1013 if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action))
1016 for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
1017 if (slwt->desc->attrs & (1 << i)) {
1018 param = &seg6_action_params[i];
1019 err = param->put(skb, slwt);
1028 static int seg6_local_get_encap_size(struct lwtunnel_state *lwt)
1030 struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
1031 unsigned long attrs;
1034 nlsize = nla_total_size(4); /* action */
1036 attrs = slwt->desc->attrs;
1038 if (attrs & (1 << SEG6_LOCAL_SRH))
1039 nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3);
1041 if (attrs & (1 << SEG6_LOCAL_TABLE))
1042 nlsize += nla_total_size(4);
1044 if (attrs & (1 << SEG6_LOCAL_NH4))
1045 nlsize += nla_total_size(4);
1047 if (attrs & (1 << SEG6_LOCAL_NH6))
1048 nlsize += nla_total_size(16);
1050 if (attrs & (1 << SEG6_LOCAL_IIF))
1051 nlsize += nla_total_size(4);
1053 if (attrs & (1 << SEG6_LOCAL_OIF))
1054 nlsize += nla_total_size(4);
1056 if (attrs & (1 << SEG6_LOCAL_BPF))
1057 nlsize += nla_total_size(sizeof(struct nlattr)) +
1058 nla_total_size(MAX_PROG_NAME) +
1064 static int seg6_local_cmp_encap(struct lwtunnel_state *a,
1065 struct lwtunnel_state *b)
1067 struct seg6_local_lwt *slwt_a, *slwt_b;
1068 struct seg6_action_param *param;
1071 slwt_a = seg6_local_lwtunnel(a);
1072 slwt_b = seg6_local_lwtunnel(b);
1074 if (slwt_a->action != slwt_b->action)
1077 if (slwt_a->desc->attrs != slwt_b->desc->attrs)
1080 for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
1081 if (slwt_a->desc->attrs & (1 << i)) {
1082 param = &seg6_action_params[i];
1083 if (param->cmp(slwt_a, slwt_b))
1091 static const struct lwtunnel_encap_ops seg6_local_ops = {
1092 .build_state = seg6_local_build_state,
1093 .destroy_state = seg6_local_destroy_state,
1094 .input = seg6_local_input,
1095 .fill_encap = seg6_local_fill_encap,
1096 .get_encap_size = seg6_local_get_encap_size,
1097 .cmp_encap = seg6_local_cmp_encap,
1098 .owner = THIS_MODULE,
1101 int __init seg6_local_init(void)
1103 return lwtunnel_encap_add_ops(&seg6_local_ops,
1104 LWTUNNEL_ENCAP_SEG6_LOCAL);
1107 void seg6_local_exit(void)
1109 lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL);