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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d1df6fd8 DL |
2 | /* |
3 | * SR-IPv6 implementation | |
4 | * | |
004d4b27 | 5 | * Authors: |
d1df6fd8 | 6 | * David Lebrun <david.lebrun@uclouvain.be> |
004d4b27 | 7 | * eBPF support: Mathieu Xhonneux <m.xhonneux@gmail.com> |
d1df6fd8 DL |
8 | */ |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/net.h> | |
13 | #include <linux/module.h> | |
14 | #include <net/ip.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> | |
20 | #include <net/seg6.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> | |
62ebaeae | 26 | #include <net/ip_tunnels.h> |
d1df6fd8 DL |
27 | #ifdef CONFIG_IPV6_SEG6_HMAC |
28 | #include <net/seg6_hmac.h> | |
29 | #endif | |
1c1e761e | 30 | #include <net/seg6_local.h> |
891ef8dd | 31 | #include <linux/etherdevice.h> |
004d4b27 | 32 | #include <linux/bpf.h> |
d1df6fd8 DL |
33 | |
34 | struct seg6_local_lwt; | |
35 | ||
cfdf64a0 AM |
36 | /* callbacks used for customizing the creation and destruction of a behavior */ |
37 | struct seg6_local_lwtunnel_ops { | |
38 | int (*build_state)(struct seg6_local_lwt *slwt, const void *cfg, | |
39 | struct netlink_ext_ack *extack); | |
40 | void (*destroy_state)(struct seg6_local_lwt *slwt); | |
41 | }; | |
42 | ||
d1df6fd8 DL |
43 | struct seg6_action_desc { |
44 | int action; | |
45 | unsigned long attrs; | |
0a3021f1 AM |
46 | |
47 | /* The optattrs field is used for specifying all the optional | |
48 | * attributes supported by a specific behavior. | |
49 | * It means that if one of these attributes is not provided in the | |
50 | * netlink message during the behavior creation, no errors will be | |
51 | * returned to the userspace. | |
52 | * | |
53 | * Each attribute can be only of two types (mutually exclusive): | |
54 | * 1) required or 2) optional. | |
55 | * Every user MUST obey to this rule! If you set an attribute as | |
56 | * required the same attribute CANNOT be set as optional and vice | |
57 | * versa. | |
58 | */ | |
59 | unsigned long optattrs; | |
60 | ||
d1df6fd8 DL |
61 | int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt); |
62 | int static_headroom; | |
cfdf64a0 AM |
63 | |
64 | struct seg6_local_lwtunnel_ops slwt_ops; | |
d1df6fd8 DL |
65 | }; |
66 | ||
004d4b27 MX |
67 | struct bpf_lwt_prog { |
68 | struct bpf_prog *prog; | |
69 | char *name; | |
70 | }; | |
71 | ||
664d6f86 AM |
72 | enum seg6_end_dt_mode { |
73 | DT_INVALID_MODE = -EINVAL, | |
74 | DT_LEGACY_MODE = 0, | |
75 | DT_VRF_MODE = 1, | |
76 | }; | |
77 | ||
78 | struct seg6_end_dt_info { | |
79 | enum seg6_end_dt_mode mode; | |
80 | ||
81 | struct net *net; | |
82 | /* VRF device associated to the routing table used by the SRv6 | |
83 | * End.DT4/DT6 behavior for routing IPv4/IPv6 packets. | |
84 | */ | |
85 | int vrf_ifindex; | |
86 | int vrf_table; | |
87 | ||
88 | /* tunneled packet proto and family (IPv4 or IPv6) */ | |
89 | __be16 proto; | |
90 | u16 family; | |
91 | int hdrlen; | |
92 | }; | |
93 | ||
d1df6fd8 DL |
94 | struct seg6_local_lwt { |
95 | int action; | |
96 | struct ipv6_sr_hdr *srh; | |
97 | int table; | |
98 | struct in_addr nh4; | |
99 | struct in6_addr nh6; | |
100 | int iif; | |
101 | int oif; | |
004d4b27 | 102 | struct bpf_lwt_prog bpf; |
664d6f86 AM |
103 | #ifdef CONFIG_NET_L3_MASTER_DEV |
104 | struct seg6_end_dt_info dt_info; | |
105 | #endif | |
d1df6fd8 DL |
106 | |
107 | int headroom; | |
108 | struct seg6_action_desc *desc; | |
0a3021f1 AM |
109 | /* unlike the required attrs, we have to track the optional attributes |
110 | * that have been effectively parsed. | |
111 | */ | |
112 | unsigned long parsed_optattrs; | |
d1df6fd8 DL |
113 | }; |
114 | ||
115 | static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt) | |
116 | { | |
117 | return (struct seg6_local_lwt *)lwt->data; | |
118 | } | |
119 | ||
140f04c3 DL |
120 | static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb) |
121 | { | |
122 | struct ipv6_sr_hdr *srh; | |
5829d70b | 123 | int len, srhoff = 0; |
140f04c3 | 124 | |
5829d70b AA |
125 | if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) |
126 | return NULL; | |
127 | ||
128 | if (!pskb_may_pull(skb, srhoff + sizeof(*srh))) | |
129 | return NULL; | |
130 | ||
131 | srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
132 | ||
140f04c3 DL |
133 | len = (srh->hdrlen + 1) << 3; |
134 | ||
5829d70b | 135 | if (!pskb_may_pull(skb, srhoff + len)) |
140f04c3 DL |
136 | return NULL; |
137 | ||
7f91ed8c AM |
138 | /* note that pskb_may_pull may change pointers in header; |
139 | * for this reason it is necessary to reload them when needed. | |
140 | */ | |
141 | srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
142 | ||
bb986a50 | 143 | if (!seg6_validate_srh(srh, len, true)) |
140f04c3 DL |
144 | return NULL; |
145 | ||
146 | return srh; | |
147 | } | |
148 | ||
149 | static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb) | |
150 | { | |
151 | struct ipv6_sr_hdr *srh; | |
152 | ||
153 | srh = get_srh(skb); | |
154 | if (!srh) | |
155 | return NULL; | |
156 | ||
157 | if (srh->segments_left == 0) | |
158 | return NULL; | |
159 | ||
160 | #ifdef CONFIG_IPV6_SEG6_HMAC | |
161 | if (!seg6_hmac_validate_skb(skb)) | |
162 | return NULL; | |
163 | #endif | |
164 | ||
165 | return srh; | |
166 | } | |
167 | ||
d7a669dd DL |
168 | static bool decap_and_validate(struct sk_buff *skb, int proto) |
169 | { | |
170 | struct ipv6_sr_hdr *srh; | |
171 | unsigned int off = 0; | |
172 | ||
173 | srh = get_srh(skb); | |
174 | if (srh && srh->segments_left > 0) | |
175 | return false; | |
176 | ||
177 | #ifdef CONFIG_IPV6_SEG6_HMAC | |
178 | if (srh && !seg6_hmac_validate_skb(skb)) | |
179 | return false; | |
180 | #endif | |
181 | ||
182 | if (ipv6_find_hdr(skb, &off, proto, NULL, NULL) < 0) | |
183 | return false; | |
184 | ||
185 | if (!pskb_pull(skb, off)) | |
186 | return false; | |
187 | ||
188 | skb_postpull_rcsum(skb, skb_network_header(skb), off); | |
189 | ||
190 | skb_reset_network_header(skb); | |
191 | skb_reset_transport_header(skb); | |
62ebaeae YT |
192 | if (iptunnel_pull_offloads(skb)) |
193 | return false; | |
d7a669dd DL |
194 | |
195 | return true; | |
196 | } | |
197 | ||
198 | static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr) | |
199 | { | |
200 | struct in6_addr *addr; | |
201 | ||
202 | srh->segments_left--; | |
203 | addr = srh->segments + srh->segments_left; | |
204 | *daddr = *addr; | |
205 | } | |
206 | ||
fd1fef0c AM |
207 | static int |
208 | seg6_lookup_any_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr, | |
209 | u32 tbl_id, bool local_delivery) | |
d7a669dd DL |
210 | { |
211 | struct net *net = dev_net(skb->dev); | |
212 | struct ipv6hdr *hdr = ipv6_hdr(skb); | |
213 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
214 | struct dst_entry *dst = NULL; | |
215 | struct rt6_info *rt; | |
216 | struct flowi6 fl6; | |
fd1fef0c | 217 | int dev_flags = 0; |
d7a669dd DL |
218 | |
219 | fl6.flowi6_iif = skb->dev->ifindex; | |
220 | fl6.daddr = nhaddr ? *nhaddr : hdr->daddr; | |
221 | fl6.saddr = hdr->saddr; | |
222 | fl6.flowlabel = ip6_flowinfo(hdr); | |
223 | fl6.flowi6_mark = skb->mark; | |
224 | fl6.flowi6_proto = hdr->nexthdr; | |
225 | ||
226 | if (nhaddr) | |
227 | fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH; | |
228 | ||
229 | if (!tbl_id) { | |
b75cc8f9 | 230 | dst = ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags); |
d7a669dd DL |
231 | } else { |
232 | struct fib6_table *table; | |
233 | ||
234 | table = fib6_get_table(net, tbl_id); | |
235 | if (!table) | |
236 | goto out; | |
237 | ||
b75cc8f9 | 238 | rt = ip6_pol_route(net, table, 0, &fl6, skb, flags); |
d7a669dd DL |
239 | dst = &rt->dst; |
240 | } | |
241 | ||
fd1fef0c AM |
242 | /* we want to discard traffic destined for local packet processing, |
243 | * if @local_delivery is set to false. | |
244 | */ | |
245 | if (!local_delivery) | |
246 | dev_flags |= IFF_LOOPBACK; | |
247 | ||
248 | if (dst && (dst->dev->flags & dev_flags) && !dst->error) { | |
d7a669dd DL |
249 | dst_release(dst); |
250 | dst = NULL; | |
251 | } | |
252 | ||
253 | out: | |
254 | if (!dst) { | |
255 | rt = net->ipv6.ip6_blk_hole_entry; | |
256 | dst = &rt->dst; | |
257 | dst_hold(dst); | |
258 | } | |
259 | ||
260 | skb_dst_drop(skb); | |
261 | skb_dst_set(skb, dst); | |
1c1e761e | 262 | return dst->error; |
d7a669dd DL |
263 | } |
264 | ||
fd1fef0c AM |
265 | int seg6_lookup_nexthop(struct sk_buff *skb, |
266 | struct in6_addr *nhaddr, u32 tbl_id) | |
267 | { | |
268 | return seg6_lookup_any_nexthop(skb, nhaddr, tbl_id, false); | |
269 | } | |
270 | ||
140f04c3 DL |
271 | /* regular endpoint function */ |
272 | static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
273 | { | |
274 | struct ipv6_sr_hdr *srh; | |
140f04c3 DL |
275 | |
276 | srh = get_and_validate_srh(skb); | |
277 | if (!srh) | |
278 | goto drop; | |
279 | ||
d7a669dd | 280 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); |
140f04c3 | 281 | |
1c1e761e | 282 | seg6_lookup_nexthop(skb, NULL, 0); |
140f04c3 DL |
283 | |
284 | return dst_input(skb); | |
285 | ||
286 | drop: | |
287 | kfree_skb(skb); | |
288 | return -EINVAL; | |
289 | } | |
290 | ||
291 | /* regular endpoint, and forward to specified nexthop */ | |
292 | static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
293 | { | |
140f04c3 | 294 | struct ipv6_sr_hdr *srh; |
140f04c3 DL |
295 | |
296 | srh = get_and_validate_srh(skb); | |
297 | if (!srh) | |
298 | goto drop; | |
299 | ||
d7a669dd | 300 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); |
140f04c3 | 301 | |
1c1e761e | 302 | seg6_lookup_nexthop(skb, &slwt->nh6, 0); |
140f04c3 DL |
303 | |
304 | return dst_input(skb); | |
305 | ||
306 | drop: | |
307 | kfree_skb(skb); | |
308 | return -EINVAL; | |
309 | } | |
310 | ||
891ef8dd DL |
311 | static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt) |
312 | { | |
313 | struct ipv6_sr_hdr *srh; | |
314 | ||
315 | srh = get_and_validate_srh(skb); | |
316 | if (!srh) | |
317 | goto drop; | |
318 | ||
319 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); | |
320 | ||
1c1e761e | 321 | seg6_lookup_nexthop(skb, NULL, slwt->table); |
891ef8dd DL |
322 | |
323 | return dst_input(skb); | |
324 | ||
325 | drop: | |
326 | kfree_skb(skb); | |
327 | return -EINVAL; | |
328 | } | |
329 | ||
330 | /* decapsulate and forward inner L2 frame on specified interface */ | |
331 | static int input_action_end_dx2(struct sk_buff *skb, | |
332 | struct seg6_local_lwt *slwt) | |
333 | { | |
334 | struct net *net = dev_net(skb->dev); | |
335 | struct net_device *odev; | |
336 | struct ethhdr *eth; | |
337 | ||
26776253 | 338 | if (!decap_and_validate(skb, IPPROTO_ETHERNET)) |
891ef8dd DL |
339 | goto drop; |
340 | ||
341 | if (!pskb_may_pull(skb, ETH_HLEN)) | |
342 | goto drop; | |
343 | ||
344 | skb_reset_mac_header(skb); | |
345 | eth = (struct ethhdr *)skb->data; | |
346 | ||
347 | /* To determine the frame's protocol, we assume it is 802.3. This avoids | |
348 | * a call to eth_type_trans(), which is not really relevant for our | |
349 | * use case. | |
350 | */ | |
351 | if (!eth_proto_is_802_3(eth->h_proto)) | |
352 | goto drop; | |
353 | ||
354 | odev = dev_get_by_index_rcu(net, slwt->oif); | |
355 | if (!odev) | |
356 | goto drop; | |
357 | ||
358 | /* As we accept Ethernet frames, make sure the egress device is of | |
359 | * the correct type. | |
360 | */ | |
361 | if (odev->type != ARPHRD_ETHER) | |
362 | goto drop; | |
363 | ||
364 | if (!(odev->flags & IFF_UP) || !netif_carrier_ok(odev)) | |
365 | goto drop; | |
366 | ||
367 | skb_orphan(skb); | |
368 | ||
369 | if (skb_warn_if_lro(skb)) | |
370 | goto drop; | |
371 | ||
372 | skb_forward_csum(skb); | |
373 | ||
374 | if (skb->len - ETH_HLEN > odev->mtu) | |
375 | goto drop; | |
376 | ||
377 | skb->dev = odev; | |
378 | skb->protocol = eth->h_proto; | |
379 | ||
380 | return dev_queue_xmit(skb); | |
381 | ||
382 | drop: | |
383 | kfree_skb(skb); | |
384 | return -EINVAL; | |
385 | } | |
386 | ||
140f04c3 DL |
387 | /* decapsulate and forward to specified nexthop */ |
388 | static int input_action_end_dx6(struct sk_buff *skb, | |
389 | struct seg6_local_lwt *slwt) | |
390 | { | |
d7a669dd | 391 | struct in6_addr *nhaddr = NULL; |
140f04c3 DL |
392 | |
393 | /* this function accepts IPv6 encapsulated packets, with either | |
394 | * an SRH with SL=0, or no SRH. | |
395 | */ | |
396 | ||
d7a669dd | 397 | if (!decap_and_validate(skb, IPPROTO_IPV6)) |
140f04c3 | 398 | goto drop; |
140f04c3 | 399 | |
d7a669dd | 400 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
140f04c3 DL |
401 | goto drop; |
402 | ||
140f04c3 DL |
403 | /* The inner packet is not associated to any local interface, |
404 | * so we do not call netif_rx(). | |
405 | * | |
406 | * If slwt->nh6 is set to ::, then lookup the nexthop for the | |
407 | * inner packet's DA. Otherwise, use the specified nexthop. | |
408 | */ | |
409 | ||
d7a669dd DL |
410 | if (!ipv6_addr_any(&slwt->nh6)) |
411 | nhaddr = &slwt->nh6; | |
140f04c3 | 412 | |
c71644d0 AM |
413 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); |
414 | ||
1c1e761e | 415 | seg6_lookup_nexthop(skb, nhaddr, 0); |
140f04c3 DL |
416 | |
417 | return dst_input(skb); | |
418 | drop: | |
419 | kfree_skb(skb); | |
420 | return -EINVAL; | |
421 | } | |
422 | ||
891ef8dd DL |
423 | static int input_action_end_dx4(struct sk_buff *skb, |
424 | struct seg6_local_lwt *slwt) | |
425 | { | |
426 | struct iphdr *iph; | |
427 | __be32 nhaddr; | |
428 | int err; | |
429 | ||
430 | if (!decap_and_validate(skb, IPPROTO_IPIP)) | |
431 | goto drop; | |
432 | ||
433 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
434 | goto drop; | |
435 | ||
436 | skb->protocol = htons(ETH_P_IP); | |
437 | ||
438 | iph = ip_hdr(skb); | |
439 | ||
440 | nhaddr = slwt->nh4.s_addr ?: iph->daddr; | |
441 | ||
442 | skb_dst_drop(skb); | |
443 | ||
c71644d0 AM |
444 | skb_set_transport_header(skb, sizeof(struct iphdr)); |
445 | ||
891ef8dd DL |
446 | err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev); |
447 | if (err) | |
448 | goto drop; | |
449 | ||
450 | return dst_input(skb); | |
451 | ||
452 | drop: | |
453 | kfree_skb(skb); | |
454 | return -EINVAL; | |
455 | } | |
456 | ||
664d6f86 AM |
457 | #ifdef CONFIG_NET_L3_MASTER_DEV |
458 | static struct net *fib6_config_get_net(const struct fib6_config *fib6_cfg) | |
459 | { | |
460 | const struct nl_info *nli = &fib6_cfg->fc_nlinfo; | |
461 | ||
462 | return nli->nl_net; | |
463 | } | |
464 | ||
465 | static int __seg6_end_dt_vrf_build(struct seg6_local_lwt *slwt, const void *cfg, | |
466 | u16 family, struct netlink_ext_ack *extack) | |
467 | { | |
468 | struct seg6_end_dt_info *info = &slwt->dt_info; | |
469 | int vrf_ifindex; | |
470 | struct net *net; | |
471 | ||
472 | net = fib6_config_get_net(cfg); | |
473 | ||
474 | /* note that vrf_table was already set by parse_nla_vrftable() */ | |
475 | vrf_ifindex = l3mdev_ifindex_lookup_by_table_id(L3MDEV_TYPE_VRF, net, | |
476 | info->vrf_table); | |
477 | if (vrf_ifindex < 0) { | |
478 | if (vrf_ifindex == -EPERM) { | |
479 | NL_SET_ERR_MSG(extack, | |
480 | "Strict mode for VRF is disabled"); | |
481 | } else if (vrf_ifindex == -ENODEV) { | |
482 | NL_SET_ERR_MSG(extack, | |
483 | "Table has no associated VRF device"); | |
484 | } else { | |
485 | pr_debug("seg6local: SRv6 End.DT* creation error=%d\n", | |
486 | vrf_ifindex); | |
487 | } | |
488 | ||
489 | return vrf_ifindex; | |
490 | } | |
491 | ||
492 | info->net = net; | |
493 | info->vrf_ifindex = vrf_ifindex; | |
494 | ||
495 | switch (family) { | |
496 | case AF_INET: | |
497 | info->proto = htons(ETH_P_IP); | |
498 | info->hdrlen = sizeof(struct iphdr); | |
499 | break; | |
20a081b7 AM |
500 | case AF_INET6: |
501 | info->proto = htons(ETH_P_IPV6); | |
502 | info->hdrlen = sizeof(struct ipv6hdr); | |
503 | break; | |
664d6f86 AM |
504 | default: |
505 | return -EINVAL; | |
506 | } | |
507 | ||
508 | info->family = family; | |
509 | info->mode = DT_VRF_MODE; | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
514 | /* The SRv6 End.DT4/DT6 behavior extracts the inner (IPv4/IPv6) packet and | |
515 | * routes the IPv4/IPv6 packet by looking at the configured routing table. | |
516 | * | |
517 | * In the SRv6 End.DT4/DT6 use case, we can receive traffic (IPv6+Segment | |
518 | * Routing Header packets) from several interfaces and the outer IPv6 | |
519 | * destination address (DA) is used for retrieving the specific instance of the | |
520 | * End.DT4/DT6 behavior that should process the packets. | |
521 | * | |
522 | * However, the inner IPv4/IPv6 packet is not really bound to any receiving | |
523 | * interface and thus the End.DT4/DT6 sets the VRF (associated with the | |
524 | * corresponding routing table) as the *receiving* interface. | |
525 | * In other words, the End.DT4/DT6 processes a packet as if it has been received | |
526 | * directly by the VRF (and not by one of its slave devices, if any). | |
527 | * In this way, the VRF interface is used for routing the IPv4/IPv6 packet in | |
528 | * according to the routing table configured by the End.DT4/DT6 instance. | |
529 | * | |
530 | * This design allows you to get some interesting features like: | |
531 | * 1) the statistics on rx packets; | |
532 | * 2) the possibility to install a packet sniffer on the receiving interface | |
533 | * (the VRF one) for looking at the incoming packets; | |
534 | * 3) the possibility to leverage the netfilter prerouting hook for the inner | |
535 | * IPv4 packet. | |
536 | * | |
537 | * This function returns: | |
538 | * - the sk_buff* when the VRF rcv handler has processed the packet correctly; | |
539 | * - NULL when the skb is consumed by the VRF rcv handler; | |
540 | * - a pointer which encodes a negative error number in case of error. | |
541 | * Note that in this case, the function takes care of freeing the skb. | |
542 | */ | |
543 | static struct sk_buff *end_dt_vrf_rcv(struct sk_buff *skb, u16 family, | |
544 | struct net_device *dev) | |
545 | { | |
546 | /* based on l3mdev_ip_rcv; we are only interested in the master */ | |
547 | if (unlikely(!netif_is_l3_master(dev) && !netif_has_l3_rx_handler(dev))) | |
548 | goto drop; | |
549 | ||
550 | if (unlikely(!dev->l3mdev_ops->l3mdev_l3_rcv)) | |
551 | goto drop; | |
552 | ||
553 | /* the decap packet IPv4/IPv6 does not come with any mac header info. | |
554 | * We must unset the mac header to allow the VRF device to rebuild it, | |
555 | * just in case there is a sniffer attached on the device. | |
556 | */ | |
557 | skb_unset_mac_header(skb); | |
558 | ||
559 | skb = dev->l3mdev_ops->l3mdev_l3_rcv(dev, skb, family); | |
560 | if (!skb) | |
561 | /* the skb buffer was consumed by the handler */ | |
562 | return NULL; | |
563 | ||
564 | /* when a packet is received by a VRF or by one of its slaves, the | |
565 | * master device reference is set into the skb. | |
566 | */ | |
567 | if (unlikely(skb->dev != dev || skb->skb_iif != dev->ifindex)) | |
568 | goto drop; | |
569 | ||
570 | return skb; | |
571 | ||
572 | drop: | |
573 | kfree_skb(skb); | |
574 | return ERR_PTR(-EINVAL); | |
575 | } | |
576 | ||
577 | static struct net_device *end_dt_get_vrf_rcu(struct sk_buff *skb, | |
578 | struct seg6_end_dt_info *info) | |
579 | { | |
580 | int vrf_ifindex = info->vrf_ifindex; | |
581 | struct net *net = info->net; | |
582 | ||
583 | if (unlikely(vrf_ifindex < 0)) | |
584 | goto error; | |
585 | ||
586 | if (unlikely(!net_eq(dev_net(skb->dev), net))) | |
587 | goto error; | |
588 | ||
589 | return dev_get_by_index_rcu(net, vrf_ifindex); | |
590 | ||
591 | error: | |
592 | return NULL; | |
593 | } | |
594 | ||
595 | static struct sk_buff *end_dt_vrf_core(struct sk_buff *skb, | |
596 | struct seg6_local_lwt *slwt) | |
597 | { | |
598 | struct seg6_end_dt_info *info = &slwt->dt_info; | |
599 | struct net_device *vrf; | |
600 | ||
601 | vrf = end_dt_get_vrf_rcu(skb, info); | |
602 | if (unlikely(!vrf)) | |
603 | goto drop; | |
604 | ||
605 | skb->protocol = info->proto; | |
606 | ||
607 | skb_dst_drop(skb); | |
608 | ||
609 | skb_set_transport_header(skb, info->hdrlen); | |
610 | ||
611 | return end_dt_vrf_rcv(skb, info->family, vrf); | |
612 | ||
613 | drop: | |
614 | kfree_skb(skb); | |
615 | return ERR_PTR(-EINVAL); | |
616 | } | |
617 | ||
618 | static int input_action_end_dt4(struct sk_buff *skb, | |
619 | struct seg6_local_lwt *slwt) | |
620 | { | |
621 | struct iphdr *iph; | |
622 | int err; | |
623 | ||
624 | if (!decap_and_validate(skb, IPPROTO_IPIP)) | |
625 | goto drop; | |
626 | ||
627 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
628 | goto drop; | |
629 | ||
630 | skb = end_dt_vrf_core(skb, slwt); | |
631 | if (!skb) | |
632 | /* packet has been processed and consumed by the VRF */ | |
633 | return 0; | |
634 | ||
635 | if (IS_ERR(skb)) | |
636 | return PTR_ERR(skb); | |
637 | ||
638 | iph = ip_hdr(skb); | |
639 | ||
640 | err = ip_route_input(skb, iph->daddr, iph->saddr, 0, skb->dev); | |
641 | if (unlikely(err)) | |
642 | goto drop; | |
643 | ||
644 | return dst_input(skb); | |
645 | ||
646 | drop: | |
647 | kfree_skb(skb); | |
648 | return -EINVAL; | |
649 | } | |
650 | ||
651 | static int seg6_end_dt4_build(struct seg6_local_lwt *slwt, const void *cfg, | |
652 | struct netlink_ext_ack *extack) | |
653 | { | |
654 | return __seg6_end_dt_vrf_build(slwt, cfg, AF_INET, extack); | |
655 | } | |
20a081b7 AM |
656 | |
657 | static enum | |
658 | seg6_end_dt_mode seg6_end_dt6_parse_mode(struct seg6_local_lwt *slwt) | |
659 | { | |
660 | unsigned long parsed_optattrs = slwt->parsed_optattrs; | |
661 | bool legacy, vrfmode; | |
662 | ||
663 | legacy = !!(parsed_optattrs & (1 << SEG6_LOCAL_TABLE)); | |
664 | vrfmode = !!(parsed_optattrs & (1 << SEG6_LOCAL_VRFTABLE)); | |
665 | ||
666 | if (!(legacy ^ vrfmode)) | |
667 | /* both are absent or present: invalid DT6 mode */ | |
668 | return DT_INVALID_MODE; | |
669 | ||
670 | return legacy ? DT_LEGACY_MODE : DT_VRF_MODE; | |
671 | } | |
672 | ||
673 | static enum seg6_end_dt_mode seg6_end_dt6_get_mode(struct seg6_local_lwt *slwt) | |
674 | { | |
675 | struct seg6_end_dt_info *info = &slwt->dt_info; | |
676 | ||
677 | return info->mode; | |
678 | } | |
679 | ||
680 | static int seg6_end_dt6_build(struct seg6_local_lwt *slwt, const void *cfg, | |
681 | struct netlink_ext_ack *extack) | |
682 | { | |
683 | enum seg6_end_dt_mode mode = seg6_end_dt6_parse_mode(slwt); | |
684 | struct seg6_end_dt_info *info = &slwt->dt_info; | |
685 | ||
686 | switch (mode) { | |
687 | case DT_LEGACY_MODE: | |
688 | info->mode = DT_LEGACY_MODE; | |
689 | return 0; | |
690 | case DT_VRF_MODE: | |
691 | return __seg6_end_dt_vrf_build(slwt, cfg, AF_INET6, extack); | |
692 | default: | |
693 | NL_SET_ERR_MSG(extack, "table or vrftable must be specified"); | |
694 | return -EINVAL; | |
695 | } | |
696 | } | |
664d6f86 AM |
697 | #endif |
698 | ||
891ef8dd DL |
699 | static int input_action_end_dt6(struct sk_buff *skb, |
700 | struct seg6_local_lwt *slwt) | |
701 | { | |
702 | if (!decap_and_validate(skb, IPPROTO_IPV6)) | |
703 | goto drop; | |
704 | ||
705 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
706 | goto drop; | |
707 | ||
20a081b7 AM |
708 | #ifdef CONFIG_NET_L3_MASTER_DEV |
709 | if (seg6_end_dt6_get_mode(slwt) == DT_LEGACY_MODE) | |
710 | goto legacy_mode; | |
711 | ||
712 | /* DT6_VRF_MODE */ | |
713 | skb = end_dt_vrf_core(skb, slwt); | |
714 | if (!skb) | |
715 | /* packet has been processed and consumed by the VRF */ | |
716 | return 0; | |
717 | ||
718 | if (IS_ERR(skb)) | |
719 | return PTR_ERR(skb); | |
720 | ||
721 | /* note: this time we do not need to specify the table because the VRF | |
722 | * takes care of selecting the correct table. | |
723 | */ | |
724 | seg6_lookup_any_nexthop(skb, NULL, 0, true); | |
725 | ||
726 | return dst_input(skb); | |
727 | ||
728 | legacy_mode: | |
729 | #endif | |
c71644d0 AM |
730 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); |
731 | ||
fd1fef0c | 732 | seg6_lookup_any_nexthop(skb, NULL, slwt->table, true); |
891ef8dd DL |
733 | |
734 | return dst_input(skb); | |
735 | ||
736 | drop: | |
737 | kfree_skb(skb); | |
738 | return -EINVAL; | |
739 | } | |
740 | ||
140f04c3 DL |
741 | /* push an SRH on top of the current one */ |
742 | static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
743 | { | |
744 | struct ipv6_sr_hdr *srh; | |
745 | int err = -EINVAL; | |
746 | ||
747 | srh = get_and_validate_srh(skb); | |
748 | if (!srh) | |
749 | goto drop; | |
750 | ||
751 | err = seg6_do_srh_inline(skb, slwt->srh); | |
752 | if (err) | |
753 | goto drop; | |
754 | ||
755 | ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
756 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); | |
757 | ||
1c1e761e | 758 | seg6_lookup_nexthop(skb, NULL, 0); |
140f04c3 DL |
759 | |
760 | return dst_input(skb); | |
761 | ||
762 | drop: | |
763 | kfree_skb(skb); | |
764 | return err; | |
765 | } | |
766 | ||
767 | /* encapsulate within an outer IPv6 header and a specified SRH */ | |
768 | static int input_action_end_b6_encap(struct sk_buff *skb, | |
769 | struct seg6_local_lwt *slwt) | |
770 | { | |
771 | struct ipv6_sr_hdr *srh; | |
140f04c3 DL |
772 | int err = -EINVAL; |
773 | ||
774 | srh = get_and_validate_srh(skb); | |
775 | if (!srh) | |
776 | goto drop; | |
777 | ||
d7a669dd | 778 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); |
140f04c3 DL |
779 | |
780 | skb_reset_inner_headers(skb); | |
781 | skb->encapsulation = 1; | |
782 | ||
32d99d0b | 783 | err = seg6_do_srh_encap(skb, slwt->srh, IPPROTO_IPV6); |
140f04c3 DL |
784 | if (err) |
785 | goto drop; | |
786 | ||
787 | ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
788 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); | |
789 | ||
1c1e761e | 790 | seg6_lookup_nexthop(skb, NULL, 0); |
140f04c3 DL |
791 | |
792 | return dst_input(skb); | |
793 | ||
794 | drop: | |
795 | kfree_skb(skb); | |
796 | return err; | |
797 | } | |
798 | ||
fe94cc29 MX |
799 | DEFINE_PER_CPU(struct seg6_bpf_srh_state, seg6_bpf_srh_states); |
800 | ||
486cdf21 MX |
801 | bool seg6_bpf_has_valid_srh(struct sk_buff *skb) |
802 | { | |
803 | struct seg6_bpf_srh_state *srh_state = | |
804 | this_cpu_ptr(&seg6_bpf_srh_states); | |
805 | struct ipv6_sr_hdr *srh = srh_state->srh; | |
806 | ||
807 | if (unlikely(srh == NULL)) | |
808 | return false; | |
809 | ||
810 | if (unlikely(!srh_state->valid)) { | |
811 | if ((srh_state->hdrlen & 7) != 0) | |
812 | return false; | |
813 | ||
814 | srh->hdrlen = (u8)(srh_state->hdrlen >> 3); | |
bb986a50 | 815 | if (!seg6_validate_srh(srh, (srh->hdrlen + 1) << 3, true)) |
486cdf21 MX |
816 | return false; |
817 | ||
818 | srh_state->valid = true; | |
819 | } | |
820 | ||
821 | return true; | |
822 | } | |
823 | ||
004d4b27 MX |
824 | static int input_action_end_bpf(struct sk_buff *skb, |
825 | struct seg6_local_lwt *slwt) | |
826 | { | |
827 | struct seg6_bpf_srh_state *srh_state = | |
828 | this_cpu_ptr(&seg6_bpf_srh_states); | |
004d4b27 | 829 | struct ipv6_sr_hdr *srh; |
004d4b27 MX |
830 | int ret; |
831 | ||
832 | srh = get_and_validate_srh(skb); | |
486cdf21 MX |
833 | if (!srh) { |
834 | kfree_skb(skb); | |
835 | return -EINVAL; | |
836 | } | |
004d4b27 MX |
837 | advance_nextseg(srh, &ipv6_hdr(skb)->daddr); |
838 | ||
839 | /* preempt_disable is needed to protect the per-CPU buffer srh_state, | |
840 | * which is also accessed by the bpf_lwt_seg6_* helpers | |
841 | */ | |
842 | preempt_disable(); | |
486cdf21 | 843 | srh_state->srh = srh; |
004d4b27 | 844 | srh_state->hdrlen = srh->hdrlen << 3; |
486cdf21 | 845 | srh_state->valid = true; |
004d4b27 MX |
846 | |
847 | rcu_read_lock(); | |
848 | bpf_compute_data_pointers(skb); | |
849 | ret = bpf_prog_run_save_cb(slwt->bpf.prog, skb); | |
850 | rcu_read_unlock(); | |
851 | ||
004d4b27 MX |
852 | switch (ret) { |
853 | case BPF_OK: | |
854 | case BPF_REDIRECT: | |
855 | break; | |
856 | case BPF_DROP: | |
857 | goto drop; | |
858 | default: | |
859 | pr_warn_once("bpf-seg6local: Illegal return value %u\n", ret); | |
860 | goto drop; | |
861 | } | |
862 | ||
486cdf21 | 863 | if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) |
004d4b27 MX |
864 | goto drop; |
865 | ||
486cdf21 | 866 | preempt_enable(); |
004d4b27 MX |
867 | if (ret != BPF_REDIRECT) |
868 | seg6_lookup_nexthop(skb, NULL, 0); | |
869 | ||
870 | return dst_input(skb); | |
871 | ||
872 | drop: | |
486cdf21 | 873 | preempt_enable(); |
004d4b27 MX |
874 | kfree_skb(skb); |
875 | return -EINVAL; | |
876 | } | |
877 | ||
d1df6fd8 DL |
878 | static struct seg6_action_desc seg6_action_table[] = { |
879 | { | |
880 | .action = SEG6_LOCAL_ACTION_END, | |
881 | .attrs = 0, | |
140f04c3 DL |
882 | .input = input_action_end, |
883 | }, | |
884 | { | |
885 | .action = SEG6_LOCAL_ACTION_END_X, | |
886 | .attrs = (1 << SEG6_LOCAL_NH6), | |
887 | .input = input_action_end_x, | |
d1df6fd8 | 888 | }, |
891ef8dd DL |
889 | { |
890 | .action = SEG6_LOCAL_ACTION_END_T, | |
891 | .attrs = (1 << SEG6_LOCAL_TABLE), | |
892 | .input = input_action_end_t, | |
893 | }, | |
894 | { | |
895 | .action = SEG6_LOCAL_ACTION_END_DX2, | |
896 | .attrs = (1 << SEG6_LOCAL_OIF), | |
897 | .input = input_action_end_dx2, | |
898 | }, | |
140f04c3 DL |
899 | { |
900 | .action = SEG6_LOCAL_ACTION_END_DX6, | |
901 | .attrs = (1 << SEG6_LOCAL_NH6), | |
902 | .input = input_action_end_dx6, | |
903 | }, | |
891ef8dd DL |
904 | { |
905 | .action = SEG6_LOCAL_ACTION_END_DX4, | |
906 | .attrs = (1 << SEG6_LOCAL_NH4), | |
907 | .input = input_action_end_dx4, | |
908 | }, | |
664d6f86 AM |
909 | { |
910 | .action = SEG6_LOCAL_ACTION_END_DT4, | |
911 | .attrs = (1 << SEG6_LOCAL_VRFTABLE), | |
912 | #ifdef CONFIG_NET_L3_MASTER_DEV | |
913 | .input = input_action_end_dt4, | |
914 | .slwt_ops = { | |
915 | .build_state = seg6_end_dt4_build, | |
916 | }, | |
917 | #endif | |
918 | }, | |
891ef8dd DL |
919 | { |
920 | .action = SEG6_LOCAL_ACTION_END_DT6, | |
20a081b7 AM |
921 | #ifdef CONFIG_NET_L3_MASTER_DEV |
922 | .attrs = 0, | |
923 | .optattrs = (1 << SEG6_LOCAL_TABLE) | | |
924 | (1 << SEG6_LOCAL_VRFTABLE), | |
925 | .slwt_ops = { | |
926 | .build_state = seg6_end_dt6_build, | |
927 | }, | |
928 | #else | |
891ef8dd | 929 | .attrs = (1 << SEG6_LOCAL_TABLE), |
20a081b7 | 930 | #endif |
891ef8dd DL |
931 | .input = input_action_end_dt6, |
932 | }, | |
140f04c3 DL |
933 | { |
934 | .action = SEG6_LOCAL_ACTION_END_B6, | |
935 | .attrs = (1 << SEG6_LOCAL_SRH), | |
936 | .input = input_action_end_b6, | |
937 | }, | |
938 | { | |
939 | .action = SEG6_LOCAL_ACTION_END_B6_ENCAP, | |
940 | .attrs = (1 << SEG6_LOCAL_SRH), | |
941 | .input = input_action_end_b6_encap, | |
942 | .static_headroom = sizeof(struct ipv6hdr), | |
004d4b27 MX |
943 | }, |
944 | { | |
945 | .action = SEG6_LOCAL_ACTION_END_BPF, | |
946 | .attrs = (1 << SEG6_LOCAL_BPF), | |
947 | .input = input_action_end_bpf, | |
948 | }, | |
949 | ||
d1df6fd8 DL |
950 | }; |
951 | ||
952 | static struct seg6_action_desc *__get_action_desc(int action) | |
953 | { | |
954 | struct seg6_action_desc *desc; | |
955 | int i, count; | |
956 | ||
709af180 | 957 | count = ARRAY_SIZE(seg6_action_table); |
d1df6fd8 DL |
958 | for (i = 0; i < count; i++) { |
959 | desc = &seg6_action_table[i]; | |
960 | if (desc->action == action) | |
961 | return desc; | |
962 | } | |
963 | ||
964 | return NULL; | |
965 | } | |
966 | ||
967 | static int seg6_local_input(struct sk_buff *skb) | |
968 | { | |
969 | struct dst_entry *orig_dst = skb_dst(skb); | |
970 | struct seg6_action_desc *desc; | |
971 | struct seg6_local_lwt *slwt; | |
972 | ||
6285217f DL |
973 | if (skb->protocol != htons(ETH_P_IPV6)) { |
974 | kfree_skb(skb); | |
975 | return -EINVAL; | |
976 | } | |
977 | ||
d1df6fd8 DL |
978 | slwt = seg6_local_lwtunnel(orig_dst->lwtstate); |
979 | desc = slwt->desc; | |
980 | ||
981 | return desc->input(skb, slwt); | |
982 | } | |
983 | ||
984 | static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = { | |
985 | [SEG6_LOCAL_ACTION] = { .type = NLA_U32 }, | |
986 | [SEG6_LOCAL_SRH] = { .type = NLA_BINARY }, | |
987 | [SEG6_LOCAL_TABLE] = { .type = NLA_U32 }, | |
664d6f86 | 988 | [SEG6_LOCAL_VRFTABLE] = { .type = NLA_U32 }, |
d1df6fd8 DL |
989 | [SEG6_LOCAL_NH4] = { .type = NLA_BINARY, |
990 | .len = sizeof(struct in_addr) }, | |
991 | [SEG6_LOCAL_NH6] = { .type = NLA_BINARY, | |
992 | .len = sizeof(struct in6_addr) }, | |
993 | [SEG6_LOCAL_IIF] = { .type = NLA_U32 }, | |
994 | [SEG6_LOCAL_OIF] = { .type = NLA_U32 }, | |
004d4b27 | 995 | [SEG6_LOCAL_BPF] = { .type = NLA_NESTED }, |
d1df6fd8 DL |
996 | }; |
997 | ||
2d9cc60a DL |
998 | static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt) |
999 | { | |
1000 | struct ipv6_sr_hdr *srh; | |
1001 | int len; | |
1002 | ||
1003 | srh = nla_data(attrs[SEG6_LOCAL_SRH]); | |
1004 | len = nla_len(attrs[SEG6_LOCAL_SRH]); | |
1005 | ||
1006 | /* SRH must contain at least one segment */ | |
1007 | if (len < sizeof(*srh) + sizeof(struct in6_addr)) | |
1008 | return -EINVAL; | |
1009 | ||
bb986a50 | 1010 | if (!seg6_validate_srh(srh, len, false)) |
2d9cc60a DL |
1011 | return -EINVAL; |
1012 | ||
7fa41efa | 1013 | slwt->srh = kmemdup(srh, len, GFP_KERNEL); |
2d9cc60a DL |
1014 | if (!slwt->srh) |
1015 | return -ENOMEM; | |
1016 | ||
2d9cc60a DL |
1017 | slwt->headroom += len; |
1018 | ||
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | static int put_nla_srh(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1023 | { | |
1024 | struct ipv6_sr_hdr *srh; | |
1025 | struct nlattr *nla; | |
1026 | int len; | |
1027 | ||
1028 | srh = slwt->srh; | |
1029 | len = (srh->hdrlen + 1) << 3; | |
1030 | ||
1031 | nla = nla_reserve(skb, SEG6_LOCAL_SRH, len); | |
1032 | if (!nla) | |
1033 | return -EMSGSIZE; | |
1034 | ||
1035 | memcpy(nla_data(nla), srh, len); | |
1036 | ||
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1041 | { | |
1042 | int len = (a->srh->hdrlen + 1) << 3; | |
1043 | ||
1044 | if (len != ((b->srh->hdrlen + 1) << 3)) | |
1045 | return 1; | |
1046 | ||
1047 | return memcmp(a->srh, b->srh, len); | |
1048 | } | |
1049 | ||
964adce5 AM |
1050 | static void destroy_attr_srh(struct seg6_local_lwt *slwt) |
1051 | { | |
1052 | kfree(slwt->srh); | |
1053 | } | |
1054 | ||
2d9cc60a DL |
1055 | static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt) |
1056 | { | |
1057 | slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]); | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1063 | { | |
1064 | if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table)) | |
1065 | return -EMSGSIZE; | |
1066 | ||
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1071 | { | |
1072 | if (a->table != b->table) | |
1073 | return 1; | |
1074 | ||
1075 | return 0; | |
1076 | } | |
1077 | ||
664d6f86 AM |
1078 | static struct |
1079 | seg6_end_dt_info *seg6_possible_end_dt_info(struct seg6_local_lwt *slwt) | |
1080 | { | |
1081 | #ifdef CONFIG_NET_L3_MASTER_DEV | |
1082 | return &slwt->dt_info; | |
1083 | #else | |
1084 | return ERR_PTR(-EOPNOTSUPP); | |
1085 | #endif | |
1086 | } | |
1087 | ||
1088 | static int parse_nla_vrftable(struct nlattr **attrs, | |
1089 | struct seg6_local_lwt *slwt) | |
1090 | { | |
1091 | struct seg6_end_dt_info *info = seg6_possible_end_dt_info(slwt); | |
1092 | ||
1093 | if (IS_ERR(info)) | |
1094 | return PTR_ERR(info); | |
1095 | ||
1096 | info->vrf_table = nla_get_u32(attrs[SEG6_LOCAL_VRFTABLE]); | |
1097 | ||
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | static int put_nla_vrftable(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1102 | { | |
1103 | struct seg6_end_dt_info *info = seg6_possible_end_dt_info(slwt); | |
1104 | ||
1105 | if (IS_ERR(info)) | |
1106 | return PTR_ERR(info); | |
1107 | ||
1108 | if (nla_put_u32(skb, SEG6_LOCAL_VRFTABLE, info->vrf_table)) | |
1109 | return -EMSGSIZE; | |
1110 | ||
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | static int cmp_nla_vrftable(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1115 | { | |
1116 | struct seg6_end_dt_info *info_a = seg6_possible_end_dt_info(a); | |
1117 | struct seg6_end_dt_info *info_b = seg6_possible_end_dt_info(b); | |
1118 | ||
1119 | if (info_a->vrf_table != info_b->vrf_table) | |
1120 | return 1; | |
1121 | ||
1122 | return 0; | |
1123 | } | |
1124 | ||
2d9cc60a DL |
1125 | static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt) |
1126 | { | |
1127 | memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]), | |
1128 | sizeof(struct in_addr)); | |
1129 | ||
1130 | return 0; | |
1131 | } | |
1132 | ||
1133 | static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1134 | { | |
1135 | struct nlattr *nla; | |
1136 | ||
1137 | nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr)); | |
1138 | if (!nla) | |
1139 | return -EMSGSIZE; | |
1140 | ||
1141 | memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr)); | |
1142 | ||
1143 | return 0; | |
1144 | } | |
1145 | ||
1146 | static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1147 | { | |
1148 | return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr)); | |
1149 | } | |
1150 | ||
1151 | static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt) | |
1152 | { | |
1153 | memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]), | |
1154 | sizeof(struct in6_addr)); | |
1155 | ||
1156 | return 0; | |
1157 | } | |
1158 | ||
1159 | static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1160 | { | |
1161 | struct nlattr *nla; | |
1162 | ||
1163 | nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr)); | |
1164 | if (!nla) | |
1165 | return -EMSGSIZE; | |
1166 | ||
1167 | memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr)); | |
1168 | ||
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1173 | { | |
1174 | return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr)); | |
1175 | } | |
1176 | ||
1177 | static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt) | |
1178 | { | |
1179 | slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]); | |
1180 | ||
1181 | return 0; | |
1182 | } | |
1183 | ||
1184 | static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1185 | { | |
1186 | if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif)) | |
1187 | return -EMSGSIZE; | |
1188 | ||
1189 | return 0; | |
1190 | } | |
1191 | ||
1192 | static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1193 | { | |
1194 | if (a->iif != b->iif) | |
1195 | return 1; | |
1196 | ||
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt) | |
1201 | { | |
1202 | slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]); | |
1203 | ||
1204 | return 0; | |
1205 | } | |
1206 | ||
1207 | static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1208 | { | |
1209 | if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif)) | |
1210 | return -EMSGSIZE; | |
1211 | ||
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1216 | { | |
1217 | if (a->oif != b->oif) | |
1218 | return 1; | |
1219 | ||
1220 | return 0; | |
1221 | } | |
1222 | ||
004d4b27 MX |
1223 | #define MAX_PROG_NAME 256 |
1224 | static const struct nla_policy bpf_prog_policy[SEG6_LOCAL_BPF_PROG_MAX + 1] = { | |
1225 | [SEG6_LOCAL_BPF_PROG] = { .type = NLA_U32, }, | |
1226 | [SEG6_LOCAL_BPF_PROG_NAME] = { .type = NLA_NUL_STRING, | |
1227 | .len = MAX_PROG_NAME }, | |
1228 | }; | |
1229 | ||
1230 | static int parse_nla_bpf(struct nlattr **attrs, struct seg6_local_lwt *slwt) | |
1231 | { | |
1232 | struct nlattr *tb[SEG6_LOCAL_BPF_PROG_MAX + 1]; | |
1233 | struct bpf_prog *p; | |
1234 | int ret; | |
1235 | u32 fd; | |
1236 | ||
8cb08174 JB |
1237 | ret = nla_parse_nested_deprecated(tb, SEG6_LOCAL_BPF_PROG_MAX, |
1238 | attrs[SEG6_LOCAL_BPF], | |
1239 | bpf_prog_policy, NULL); | |
004d4b27 MX |
1240 | if (ret < 0) |
1241 | return ret; | |
1242 | ||
1243 | if (!tb[SEG6_LOCAL_BPF_PROG] || !tb[SEG6_LOCAL_BPF_PROG_NAME]) | |
1244 | return -EINVAL; | |
1245 | ||
1246 | slwt->bpf.name = nla_memdup(tb[SEG6_LOCAL_BPF_PROG_NAME], GFP_KERNEL); | |
1247 | if (!slwt->bpf.name) | |
1248 | return -ENOMEM; | |
1249 | ||
1250 | fd = nla_get_u32(tb[SEG6_LOCAL_BPF_PROG]); | |
1251 | p = bpf_prog_get_type(fd, BPF_PROG_TYPE_LWT_SEG6LOCAL); | |
1252 | if (IS_ERR(p)) { | |
1253 | kfree(slwt->bpf.name); | |
1254 | return PTR_ERR(p); | |
1255 | } | |
1256 | ||
1257 | slwt->bpf.prog = p; | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | static int put_nla_bpf(struct sk_buff *skb, struct seg6_local_lwt *slwt) | |
1262 | { | |
1263 | struct nlattr *nest; | |
1264 | ||
1265 | if (!slwt->bpf.prog) | |
1266 | return 0; | |
1267 | ||
ae0be8de | 1268 | nest = nla_nest_start_noflag(skb, SEG6_LOCAL_BPF); |
004d4b27 MX |
1269 | if (!nest) |
1270 | return -EMSGSIZE; | |
1271 | ||
1272 | if (nla_put_u32(skb, SEG6_LOCAL_BPF_PROG, slwt->bpf.prog->aux->id)) | |
1273 | return -EMSGSIZE; | |
1274 | ||
1275 | if (slwt->bpf.name && | |
1276 | nla_put_string(skb, SEG6_LOCAL_BPF_PROG_NAME, slwt->bpf.name)) | |
1277 | return -EMSGSIZE; | |
1278 | ||
1279 | return nla_nest_end(skb, nest); | |
1280 | } | |
1281 | ||
1282 | static int cmp_nla_bpf(struct seg6_local_lwt *a, struct seg6_local_lwt *b) | |
1283 | { | |
1284 | if (!a->bpf.name && !b->bpf.name) | |
1285 | return 0; | |
1286 | ||
1287 | if (!a->bpf.name || !b->bpf.name) | |
1288 | return 1; | |
1289 | ||
1290 | return strcmp(a->bpf.name, b->bpf.name); | |
1291 | } | |
1292 | ||
964adce5 AM |
1293 | static void destroy_attr_bpf(struct seg6_local_lwt *slwt) |
1294 | { | |
1295 | kfree(slwt->bpf.name); | |
1296 | if (slwt->bpf.prog) | |
1297 | bpf_prog_put(slwt->bpf.prog); | |
1298 | } | |
1299 | ||
d1df6fd8 DL |
1300 | struct seg6_action_param { |
1301 | int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt); | |
1302 | int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt); | |
1303 | int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b); | |
964adce5 AM |
1304 | |
1305 | /* optional destroy() callback useful for releasing resources which | |
1306 | * have been previously acquired in the corresponding parse() | |
1307 | * function. | |
1308 | */ | |
1309 | void (*destroy)(struct seg6_local_lwt *slwt); | |
d1df6fd8 DL |
1310 | }; |
1311 | ||
1312 | static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = { | |
2d9cc60a DL |
1313 | [SEG6_LOCAL_SRH] = { .parse = parse_nla_srh, |
1314 | .put = put_nla_srh, | |
964adce5 AM |
1315 | .cmp = cmp_nla_srh, |
1316 | .destroy = destroy_attr_srh }, | |
d1df6fd8 | 1317 | |
2d9cc60a DL |
1318 | [SEG6_LOCAL_TABLE] = { .parse = parse_nla_table, |
1319 | .put = put_nla_table, | |
1320 | .cmp = cmp_nla_table }, | |
d1df6fd8 | 1321 | |
2d9cc60a DL |
1322 | [SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4, |
1323 | .put = put_nla_nh4, | |
1324 | .cmp = cmp_nla_nh4 }, | |
d1df6fd8 | 1325 | |
2d9cc60a DL |
1326 | [SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6, |
1327 | .put = put_nla_nh6, | |
1328 | .cmp = cmp_nla_nh6 }, | |
d1df6fd8 | 1329 | |
2d9cc60a DL |
1330 | [SEG6_LOCAL_IIF] = { .parse = parse_nla_iif, |
1331 | .put = put_nla_iif, | |
1332 | .cmp = cmp_nla_iif }, | |
d1df6fd8 | 1333 | |
2d9cc60a DL |
1334 | [SEG6_LOCAL_OIF] = { .parse = parse_nla_oif, |
1335 | .put = put_nla_oif, | |
1336 | .cmp = cmp_nla_oif }, | |
004d4b27 MX |
1337 | |
1338 | [SEG6_LOCAL_BPF] = { .parse = parse_nla_bpf, | |
1339 | .put = put_nla_bpf, | |
964adce5 AM |
1340 | .cmp = cmp_nla_bpf, |
1341 | .destroy = destroy_attr_bpf }, | |
004d4b27 | 1342 | |
664d6f86 AM |
1343 | [SEG6_LOCAL_VRFTABLE] = { .parse = parse_nla_vrftable, |
1344 | .put = put_nla_vrftable, | |
1345 | .cmp = cmp_nla_vrftable }, | |
1346 | ||
d1df6fd8 DL |
1347 | }; |
1348 | ||
964adce5 | 1349 | /* call the destroy() callback (if available) for each set attribute in |
0a3021f1 AM |
1350 | * @parsed_attrs, starting from the first attribute up to the @max_parsed |
1351 | * (excluded) attribute. | |
964adce5 | 1352 | */ |
0a3021f1 AM |
1353 | static void __destroy_attrs(unsigned long parsed_attrs, int max_parsed, |
1354 | struct seg6_local_lwt *slwt) | |
964adce5 | 1355 | { |
964adce5 AM |
1356 | struct seg6_action_param *param; |
1357 | int i; | |
1358 | ||
1359 | /* Every required seg6local attribute is identified by an ID which is | |
1360 | * encoded as a flag (i.e: 1 << ID) in the 'attrs' bitmask; | |
1361 | * | |
0a3021f1 | 1362 | * We scan the 'parsed_attrs' bitmask, starting from the first attribute |
964adce5 AM |
1363 | * up to the @max_parsed (excluded) attribute. |
1364 | * For each set attribute, we retrieve the corresponding destroy() | |
1365 | * callback. If the callback is not available, then we skip to the next | |
1366 | * attribute; otherwise, we call the destroy() callback. | |
1367 | */ | |
1368 | for (i = 0; i < max_parsed; ++i) { | |
0a3021f1 | 1369 | if (!(parsed_attrs & (1 << i))) |
964adce5 AM |
1370 | continue; |
1371 | ||
1372 | param = &seg6_action_params[i]; | |
1373 | ||
1374 | if (param->destroy) | |
1375 | param->destroy(slwt); | |
1376 | } | |
1377 | } | |
1378 | ||
1379 | /* release all the resources that may have been acquired during parsing | |
1380 | * operations. | |
1381 | */ | |
1382 | static void destroy_attrs(struct seg6_local_lwt *slwt) | |
1383 | { | |
0a3021f1 AM |
1384 | unsigned long attrs = slwt->desc->attrs | slwt->parsed_optattrs; |
1385 | ||
1386 | __destroy_attrs(attrs, SEG6_LOCAL_MAX + 1, slwt); | |
1387 | } | |
1388 | ||
1389 | static int parse_nla_optional_attrs(struct nlattr **attrs, | |
1390 | struct seg6_local_lwt *slwt) | |
1391 | { | |
1392 | struct seg6_action_desc *desc = slwt->desc; | |
1393 | unsigned long parsed_optattrs = 0; | |
1394 | struct seg6_action_param *param; | |
1395 | int err, i; | |
1396 | ||
1397 | for (i = 0; i < SEG6_LOCAL_MAX + 1; ++i) { | |
1398 | if (!(desc->optattrs & (1 << i)) || !attrs[i]) | |
1399 | continue; | |
1400 | ||
1401 | /* once here, the i-th attribute is provided by the | |
1402 | * userspace AND it is identified optional as well. | |
1403 | */ | |
1404 | param = &seg6_action_params[i]; | |
1405 | ||
1406 | err = param->parse(attrs, slwt); | |
1407 | if (err < 0) | |
1408 | goto parse_optattrs_err; | |
1409 | ||
1410 | /* current attribute has been correctly parsed */ | |
1411 | parsed_optattrs |= (1 << i); | |
1412 | } | |
1413 | ||
1414 | /* store in the tunnel state all the optional attributed successfully | |
1415 | * parsed. | |
1416 | */ | |
1417 | slwt->parsed_optattrs = parsed_optattrs; | |
1418 | ||
1419 | return 0; | |
1420 | ||
1421 | parse_optattrs_err: | |
1422 | __destroy_attrs(parsed_optattrs, i, slwt); | |
1423 | ||
1424 | return err; | |
964adce5 AM |
1425 | } |
1426 | ||
cfdf64a0 AM |
1427 | /* call the custom constructor of the behavior during its initialization phase |
1428 | * and after that all its attributes have been parsed successfully. | |
1429 | */ | |
1430 | static int | |
1431 | seg6_local_lwtunnel_build_state(struct seg6_local_lwt *slwt, const void *cfg, | |
1432 | struct netlink_ext_ack *extack) | |
1433 | { | |
1434 | struct seg6_action_desc *desc = slwt->desc; | |
1435 | struct seg6_local_lwtunnel_ops *ops; | |
1436 | ||
1437 | ops = &desc->slwt_ops; | |
1438 | if (!ops->build_state) | |
1439 | return 0; | |
1440 | ||
1441 | return ops->build_state(slwt, cfg, extack); | |
1442 | } | |
1443 | ||
1444 | /* call the custom destructor of the behavior which is invoked before the | |
1445 | * tunnel is going to be destroyed. | |
1446 | */ | |
1447 | static void seg6_local_lwtunnel_destroy_state(struct seg6_local_lwt *slwt) | |
1448 | { | |
1449 | struct seg6_action_desc *desc = slwt->desc; | |
1450 | struct seg6_local_lwtunnel_ops *ops; | |
1451 | ||
1452 | ops = &desc->slwt_ops; | |
1453 | if (!ops->destroy_state) | |
1454 | return; | |
1455 | ||
1456 | ops->destroy_state(slwt); | |
1457 | } | |
1458 | ||
d1df6fd8 DL |
1459 | static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt) |
1460 | { | |
1461 | struct seg6_action_param *param; | |
1462 | struct seg6_action_desc *desc; | |
0a3021f1 | 1463 | unsigned long invalid_attrs; |
d1df6fd8 DL |
1464 | int i, err; |
1465 | ||
1466 | desc = __get_action_desc(slwt->action); | |
1467 | if (!desc) | |
1468 | return -EINVAL; | |
1469 | ||
1470 | if (!desc->input) | |
1471 | return -EOPNOTSUPP; | |
1472 | ||
1473 | slwt->desc = desc; | |
1474 | slwt->headroom += desc->static_headroom; | |
1475 | ||
0a3021f1 AM |
1476 | /* Forcing the desc->optattrs *set* and the desc->attrs *set* to be |
1477 | * disjoined, this allow us to release acquired resources by optional | |
1478 | * attributes and by required attributes independently from each other | |
1479 | * without any interfarence. | |
1480 | * In other terms, we are sure that we do not release some the acquired | |
1481 | * resources twice. | |
1482 | * | |
1483 | * Note that if an attribute is configured both as required and as | |
1484 | * optional, it means that the user has messed something up in the | |
1485 | * seg6_action_table. Therefore, this check is required for SRv6 | |
1486 | * behaviors to work properly. | |
1487 | */ | |
1488 | invalid_attrs = desc->attrs & desc->optattrs; | |
1489 | if (invalid_attrs) { | |
1490 | WARN_ONCE(1, | |
1491 | "An attribute cannot be both required AND optional"); | |
1492 | return -EINVAL; | |
1493 | } | |
1494 | ||
1495 | /* parse the required attributes */ | |
d1df6fd8 DL |
1496 | for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) { |
1497 | if (desc->attrs & (1 << i)) { | |
1498 | if (!attrs[i]) | |
1499 | return -EINVAL; | |
1500 | ||
1501 | param = &seg6_action_params[i]; | |
1502 | ||
1503 | err = param->parse(attrs, slwt); | |
1504 | if (err < 0) | |
0a3021f1 | 1505 | goto parse_attrs_err; |
d1df6fd8 DL |
1506 | } |
1507 | } | |
1508 | ||
0a3021f1 AM |
1509 | /* parse the optional attributes, if any */ |
1510 | err = parse_nla_optional_attrs(attrs, slwt); | |
1511 | if (err < 0) | |
1512 | goto parse_attrs_err; | |
1513 | ||
d1df6fd8 | 1514 | return 0; |
964adce5 | 1515 | |
0a3021f1 | 1516 | parse_attrs_err: |
964adce5 AM |
1517 | /* release any resource that may have been acquired during the i-1 |
1518 | * parse() operations. | |
1519 | */ | |
0a3021f1 | 1520 | __destroy_attrs(desc->attrs, i, slwt); |
964adce5 AM |
1521 | |
1522 | return err; | |
d1df6fd8 DL |
1523 | } |
1524 | ||
faee6769 AA |
1525 | static int seg6_local_build_state(struct net *net, struct nlattr *nla, |
1526 | unsigned int family, const void *cfg, | |
1527 | struct lwtunnel_state **ts, | |
d1df6fd8 DL |
1528 | struct netlink_ext_ack *extack) |
1529 | { | |
1530 | struct nlattr *tb[SEG6_LOCAL_MAX + 1]; | |
1531 | struct lwtunnel_state *newts; | |
1532 | struct seg6_local_lwt *slwt; | |
1533 | int err; | |
1534 | ||
6285217f DL |
1535 | if (family != AF_INET6) |
1536 | return -EINVAL; | |
1537 | ||
8cb08174 JB |
1538 | err = nla_parse_nested_deprecated(tb, SEG6_LOCAL_MAX, nla, |
1539 | seg6_local_policy, extack); | |
d1df6fd8 DL |
1540 | |
1541 | if (err < 0) | |
1542 | return err; | |
1543 | ||
1544 | if (!tb[SEG6_LOCAL_ACTION]) | |
1545 | return -EINVAL; | |
1546 | ||
1547 | newts = lwtunnel_state_alloc(sizeof(*slwt)); | |
1548 | if (!newts) | |
1549 | return -ENOMEM; | |
1550 | ||
1551 | slwt = seg6_local_lwtunnel(newts); | |
1552 | slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]); | |
1553 | ||
1554 | err = parse_nla_action(tb, slwt); | |
1555 | if (err < 0) | |
1556 | goto out_free; | |
1557 | ||
cfdf64a0 AM |
1558 | err = seg6_local_lwtunnel_build_state(slwt, cfg, extack); |
1559 | if (err < 0) | |
1560 | goto out_destroy_attrs; | |
1561 | ||
d1df6fd8 DL |
1562 | newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL; |
1563 | newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT; | |
1564 | newts->headroom = slwt->headroom; | |
1565 | ||
1566 | *ts = newts; | |
1567 | ||
1568 | return 0; | |
1569 | ||
cfdf64a0 AM |
1570 | out_destroy_attrs: |
1571 | destroy_attrs(slwt); | |
d1df6fd8 | 1572 | out_free: |
d1df6fd8 DL |
1573 | kfree(newts); |
1574 | return err; | |
1575 | } | |
1576 | ||
1577 | static void seg6_local_destroy_state(struct lwtunnel_state *lwt) | |
1578 | { | |
1579 | struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt); | |
1580 | ||
cfdf64a0 AM |
1581 | seg6_local_lwtunnel_destroy_state(slwt); |
1582 | ||
964adce5 | 1583 | destroy_attrs(slwt); |
004d4b27 MX |
1584 | |
1585 | return; | |
d1df6fd8 DL |
1586 | } |
1587 | ||
1588 | static int seg6_local_fill_encap(struct sk_buff *skb, | |
1589 | struct lwtunnel_state *lwt) | |
1590 | { | |
1591 | struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt); | |
1592 | struct seg6_action_param *param; | |
0a3021f1 | 1593 | unsigned long attrs; |
d1df6fd8 DL |
1594 | int i, err; |
1595 | ||
1596 | if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action)) | |
1597 | return -EMSGSIZE; | |
1598 | ||
0a3021f1 AM |
1599 | attrs = slwt->desc->attrs | slwt->parsed_optattrs; |
1600 | ||
d1df6fd8 | 1601 | for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) { |
0a3021f1 | 1602 | if (attrs & (1 << i)) { |
d1df6fd8 DL |
1603 | param = &seg6_action_params[i]; |
1604 | err = param->put(skb, slwt); | |
1605 | if (err < 0) | |
1606 | return err; | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | return 0; | |
1611 | } | |
1612 | ||
1613 | static int seg6_local_get_encap_size(struct lwtunnel_state *lwt) | |
1614 | { | |
1615 | struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt); | |
1616 | unsigned long attrs; | |
1617 | int nlsize; | |
1618 | ||
1619 | nlsize = nla_total_size(4); /* action */ | |
1620 | ||
0a3021f1 | 1621 | attrs = slwt->desc->attrs | slwt->parsed_optattrs; |
d1df6fd8 DL |
1622 | |
1623 | if (attrs & (1 << SEG6_LOCAL_SRH)) | |
1624 | nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3); | |
1625 | ||
1626 | if (attrs & (1 << SEG6_LOCAL_TABLE)) | |
1627 | nlsize += nla_total_size(4); | |
1628 | ||
1629 | if (attrs & (1 << SEG6_LOCAL_NH4)) | |
1630 | nlsize += nla_total_size(4); | |
1631 | ||
1632 | if (attrs & (1 << SEG6_LOCAL_NH6)) | |
1633 | nlsize += nla_total_size(16); | |
1634 | ||
1635 | if (attrs & (1 << SEG6_LOCAL_IIF)) | |
1636 | nlsize += nla_total_size(4); | |
1637 | ||
1638 | if (attrs & (1 << SEG6_LOCAL_OIF)) | |
1639 | nlsize += nla_total_size(4); | |
1640 | ||
004d4b27 MX |
1641 | if (attrs & (1 << SEG6_LOCAL_BPF)) |
1642 | nlsize += nla_total_size(sizeof(struct nlattr)) + | |
1643 | nla_total_size(MAX_PROG_NAME) + | |
1644 | nla_total_size(4); | |
1645 | ||
664d6f86 AM |
1646 | if (attrs & (1 << SEG6_LOCAL_VRFTABLE)) |
1647 | nlsize += nla_total_size(4); | |
1648 | ||
d1df6fd8 DL |
1649 | return nlsize; |
1650 | } | |
1651 | ||
1652 | static int seg6_local_cmp_encap(struct lwtunnel_state *a, | |
1653 | struct lwtunnel_state *b) | |
1654 | { | |
1655 | struct seg6_local_lwt *slwt_a, *slwt_b; | |
1656 | struct seg6_action_param *param; | |
0a3021f1 | 1657 | unsigned long attrs_a, attrs_b; |
d1df6fd8 DL |
1658 | int i; |
1659 | ||
1660 | slwt_a = seg6_local_lwtunnel(a); | |
1661 | slwt_b = seg6_local_lwtunnel(b); | |
1662 | ||
1663 | if (slwt_a->action != slwt_b->action) | |
1664 | return 1; | |
1665 | ||
0a3021f1 AM |
1666 | attrs_a = slwt_a->desc->attrs | slwt_a->parsed_optattrs; |
1667 | attrs_b = slwt_b->desc->attrs | slwt_b->parsed_optattrs; | |
1668 | ||
1669 | if (attrs_a != attrs_b) | |
d1df6fd8 DL |
1670 | return 1; |
1671 | ||
1672 | for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) { | |
0a3021f1 | 1673 | if (attrs_a & (1 << i)) { |
d1df6fd8 DL |
1674 | param = &seg6_action_params[i]; |
1675 | if (param->cmp(slwt_a, slwt_b)) | |
1676 | return 1; | |
1677 | } | |
1678 | } | |
1679 | ||
1680 | return 0; | |
1681 | } | |
1682 | ||
1683 | static const struct lwtunnel_encap_ops seg6_local_ops = { | |
1684 | .build_state = seg6_local_build_state, | |
1685 | .destroy_state = seg6_local_destroy_state, | |
1686 | .input = seg6_local_input, | |
1687 | .fill_encap = seg6_local_fill_encap, | |
1688 | .get_encap_size = seg6_local_get_encap_size, | |
1689 | .cmp_encap = seg6_local_cmp_encap, | |
1690 | .owner = THIS_MODULE, | |
1691 | }; | |
1692 | ||
1693 | int __init seg6_local_init(void) | |
1694 | { | |
1695 | return lwtunnel_encap_add_ops(&seg6_local_ops, | |
1696 | LWTUNNEL_ENCAP_SEG6_LOCAL); | |
1697 | } | |
1698 | ||
1699 | void seg6_local_exit(void) | |
1700 | { | |
1701 | lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL); | |
1702 | } |