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[linux-2.6-block.git] / net / ipv6 / seg6_local.c
CommitLineData
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
b6459415 10#include <linux/filter.h>
d1df6fd8
DL		 11#include <linux/types.h>
12#include <linux/skbuff.h>
13#include <linux/net.h>
14#include <linux/module.h>
15#include <net/ip.h>
16#include <net/lwtunnel.h>
17#include <net/netevent.h>
18#include <net/netns/generic.h>
19#include <net/ip6_fib.h>
20#include <net/route.h>
21#include <net/seg6.h>
22#include <linux/seg6.h>
23#include <linux/seg6_local.h>
24#include <net/addrconf.h>
25#include <net/ip6_route.h>
26#include <net/dst_cache.h>
62ebaeae 27#include <net/ip_tunnels.h>
d1df6fd8
DL		 28#ifdef CONFIG_IPV6_SEG6_HMAC
29#include <net/seg6_hmac.h>
30#endif
1c1e761e 31#include <net/seg6_local.h>
891ef8dd 32#include <linux/etherdevice.h>
004d4b27 33#include <linux/bpf.h>
7a3f5b0d 34#include <linux/netfilter.h>
d1df6fd8 35
300a0fd8
AM		 36#define SEG6_F_ATTR(i) BIT(i)
37
d1df6fd8
DL		 38struct seg6_local_lwt;
39
cfdf64a0
AM		 40/* callbacks used for customizing the creation and destruction of a behavior */
41struct seg6_local_lwtunnel_ops {
42 int (*build_state)(struct seg6_local_lwt *slwt, const void *cfg,
43 struct netlink_ext_ack *extack);
44 void (*destroy_state)(struct seg6_local_lwt *slwt);
45};
46
d1df6fd8
DL		 47struct seg6_action_desc {
48 int action;
49 unsigned long attrs;
0a3021f1
AM		 50
51 /* The optattrs field is used for specifying all the optional
52 * attributes supported by a specific behavior.
53 * It means that if one of these attributes is not provided in the
54 * netlink message during the behavior creation, no errors will be
55 * returned to the userspace.
56 *
57 * Each attribute can be only of two types (mutually exclusive):
58 * 1) required or 2) optional.
59 * Every user MUST obey to this rule! If you set an attribute as
60 * required the same attribute CANNOT be set as optional and vice
61 * versa.
62 */
63 unsigned long optattrs;
64
d1df6fd8
DL		 65 int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
66 int static_headroom;
cfdf64a0
AM		 67
68 struct seg6_local_lwtunnel_ops slwt_ops;
d1df6fd8
DL		 69};
70
004d4b27
MX		 71struct bpf_lwt_prog {
72 struct bpf_prog *prog;
73 char *name;
74};
75
664d6f86
AM		 76enum seg6_end_dt_mode {
77 DT_INVALID_MODE = -EINVAL,
78 DT_LEGACY_MODE = 0,
79 DT_VRF_MODE = 1,
80};
81
82struct seg6_end_dt_info {
83 enum seg6_end_dt_mode mode;
84
85 struct net *net;
86 /* VRF device associated to the routing table used by the SRv6
87 * End.DT4/DT6 behavior for routing IPv4/IPv6 packets.
88 */
89 int vrf_ifindex;
90 int vrf_table;
91
8b532109
AM		 92 /* tunneled packet family (IPv4 or IPv6).
93 * Protocol and header length are inferred from family.
94 */
664d6f86 95 u16 family;
664d6f86
AM		 96};
97
94604548
AM		 98struct pcpu_seg6_local_counters {
99 u64_stats_t packets;
100 u64_stats_t bytes;
101 u64_stats_t errors;
102
103 struct u64_stats_sync syncp;
104};
105
106/* This struct groups all the SRv6 Behavior counters supported so far.
107 *
108 * put_nla_counters() makes use of this data structure to collect all counter
109 * values after the per-CPU counter evaluation has been performed.
110 * Finally, each counter value (in seg6_local_counters) is stored in the
111 * corresponding netlink attribute and sent to user space.
112 *
113 * NB: we don't want to expose this structure to user space!
114 */
115struct seg6_local_counters {
116 __u64 packets;
117 __u64 bytes;
118 __u64 errors;
119};
120
121#define seg6_local_alloc_pcpu_counters(__gfp) \
122 __netdev_alloc_pcpu_stats(struct pcpu_seg6_local_counters, \
123 ((__gfp) | __GFP_ZERO))
124
125#define SEG6_F_LOCAL_COUNTERS SEG6_F_ATTR(SEG6_LOCAL_COUNTERS)
126
d1df6fd8
DL		 127struct seg6_local_lwt {
128 int action;
129 struct ipv6_sr_hdr *srh;
130 int table;
131 struct in_addr nh4;
132 struct in6_addr nh6;
133 int iif;
134 int oif;
004d4b27 135 struct bpf_lwt_prog bpf;
664d6f86
AM		 136#ifdef CONFIG_NET_L3_MASTER_DEV
137 struct seg6_end_dt_info dt_info;
138#endif
94604548 139 struct pcpu_seg6_local_counters __percpu *pcpu_counters;
d1df6fd8
DL		 140
141 int headroom;
142 struct seg6_action_desc *desc;
0a3021f1
AM		 143 /* unlike the required attrs, we have to track the optional attributes
144 * that have been effectively parsed.
145 */
146 unsigned long parsed_optattrs;
d1df6fd8
DL		 147};
148
149static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt)
150{
151 return (struct seg6_local_lwt *)lwt->data;
152}
153
140f04c3
DL		 154static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb)
155{
156 struct ipv6_sr_hdr *srh;
157
fa55a7d7 158 srh = seg6_get_srh(skb, IP6_FH_F_SKIP_RH);
140f04c3
DL		 159 if (!srh)
160 return NULL;
161
140f04c3
DL		 162#ifdef CONFIG_IPV6_SEG6_HMAC
163 if (!seg6_hmac_validate_skb(skb))
164 return NULL;
165#endif
166
167 return srh;
168}
169
d7a669dd
DL		 170static bool decap_and_validate(struct sk_buff *skb, int proto)
171{
172 struct ipv6_sr_hdr *srh;
173 unsigned int off = 0;
174
fa55a7d7 175 srh = seg6_get_srh(skb, 0);
d7a669dd
DL		 176 if (srh && srh->segments_left > 0)
177 return false;
178
179#ifdef CONFIG_IPV6_SEG6_HMAC
180 if (srh && !seg6_hmac_validate_skb(skb))
181 return false;
182#endif
183
184 if (ipv6_find_hdr(skb, &off, proto, NULL, NULL) < 0)
185 return false;
186
187 if (!pskb_pull(skb, off))
188 return false;
189
190 skb_postpull_rcsum(skb, skb_network_header(skb), off);
191
192 skb_reset_network_header(skb);
193 skb_reset_transport_header(skb);
62ebaeae
YT		 194 if (iptunnel_pull_offloads(skb))
195 return false;
d7a669dd
DL		 196
197 return true;
198}
199
200static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr)
201{
202 struct in6_addr *addr;
203
204 srh->segments_left--;
205 addr = srh->segments + srh->segments_left;
206 *daddr = *addr;
207}
208
fd1fef0c
AM		 209static int
210seg6_lookup_any_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
211 u32 tbl_id, bool local_delivery)
d7a669dd
DL		 212{
213 struct net *net = dev_net(skb->dev);
214 struct ipv6hdr *hdr = ipv6_hdr(skb);
215 int flags = RT6_LOOKUP_F_HAS_SADDR;
216 struct dst_entry *dst = NULL;
217 struct rt6_info *rt;
218 struct flowi6 fl6;
fd1fef0c 219 int dev_flags = 0;
d7a669dd 220
a3bd2102 221 memset(&fl6, 0, sizeof(fl6));
d7a669dd
DL		 222 fl6.flowi6_iif = skb->dev->ifindex;
223 fl6.daddr = nhaddr ? *nhaddr : hdr->daddr;
224 fl6.saddr = hdr->saddr;
225 fl6.flowlabel = ip6_flowinfo(hdr);
226 fl6.flowi6_mark = skb->mark;
227 fl6.flowi6_proto = hdr->nexthdr;
228
229 if (nhaddr)
230 fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH;
231
232 if (!tbl_id) {
b75cc8f9 233 dst = ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags);
d7a669dd
DL		 234 } else {
235 struct fib6_table *table;
236
237 table = fib6_get_table(net, tbl_id);
238 if (!table)
239 goto out;
240
b75cc8f9 241 rt = ip6_pol_route(net, table, 0, &fl6, skb, flags);
d7a669dd
DL		 242 dst = &rt->dst;
243 }
244
fd1fef0c
AM		 245 /* we want to discard traffic destined for local packet processing,
246 * if @local_delivery is set to false.
247 */
248 if (!local_delivery)
249 dev_flags |= IFF_LOOPBACK;
250
251 if (dst && (dst->dev->flags & dev_flags) && !dst->error) {
d7a669dd
DL		 252 dst_release(dst);
253 dst = NULL;
254 }
255
256out:
257 if (!dst) {
258 rt = net->ipv6.ip6_blk_hole_entry;
259 dst = &rt->dst;
260 dst_hold(dst);
261 }
262
263 skb_dst_drop(skb);
264 skb_dst_set(skb, dst);
1c1e761e 265 return dst->error;
d7a669dd
DL		 266}
267
fd1fef0c
AM		 268int seg6_lookup_nexthop(struct sk_buff *skb,
269 struct in6_addr *nhaddr, u32 tbl_id)
270{
271 return seg6_lookup_any_nexthop(skb, nhaddr, tbl_id, false);
272}
273
140f04c3
DL		 274/* regular endpoint function */
275static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt)
276{
277 struct ipv6_sr_hdr *srh;
140f04c3
DL		 278
279 srh = get_and_validate_srh(skb);
280 if (!srh)
281 goto drop;
282
d7a669dd 283 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
140f04c3 284
1c1e761e 285 seg6_lookup_nexthop(skb, NULL, 0);
140f04c3
DL		 286
287 return dst_input(skb);
288
289drop:
290 kfree_skb(skb);
291 return -EINVAL;
292}
293
294/* regular endpoint, and forward to specified nexthop */
295static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt)
296{
140f04c3 297 struct ipv6_sr_hdr *srh;
140f04c3
DL		 298
299 srh = get_and_validate_srh(skb);
300 if (!srh)
301 goto drop;
302
d7a669dd 303 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
140f04c3 304
1c1e761e 305 seg6_lookup_nexthop(skb, &slwt->nh6, 0);
140f04c3
DL		 306
307 return dst_input(skb);
308
309drop:
310 kfree_skb(skb);
311 return -EINVAL;
312}
313
891ef8dd
DL		 314static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt)
315{
316 struct ipv6_sr_hdr *srh;
317
318 srh = get_and_validate_srh(skb);
319 if (!srh)
320 goto drop;
321
322 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
323
1c1e761e 324 seg6_lookup_nexthop(skb, NULL, slwt->table);
891ef8dd
DL		 325
326 return dst_input(skb);
327
328drop:
329 kfree_skb(skb);
330 return -EINVAL;
331}
332
333/* decapsulate and forward inner L2 frame on specified interface */
334static int input_action_end_dx2(struct sk_buff *skb,
335 struct seg6_local_lwt *slwt)
336{
337 struct net *net = dev_net(skb->dev);
338 struct net_device *odev;
339 struct ethhdr *eth;
340
26776253 341 if (!decap_and_validate(skb, IPPROTO_ETHERNET))
891ef8dd
DL		 342 goto drop;
343
344 if (!pskb_may_pull(skb, ETH_HLEN))
345 goto drop;
346
347 skb_reset_mac_header(skb);
348 eth = (struct ethhdr *)skb->data;
349
350 /* To determine the frame's protocol, we assume it is 802.3. This avoids
351 * a call to eth_type_trans(), which is not really relevant for our
352 * use case.
353 */
354 if (!eth_proto_is_802_3(eth->h_proto))
355 goto drop;
356
357 odev = dev_get_by_index_rcu(net, slwt->oif);
358 if (!odev)
359 goto drop;
360
361 /* As we accept Ethernet frames, make sure the egress device is of
362 * the correct type.
363 */
364 if (odev->type != ARPHRD_ETHER)
365 goto drop;
366
367 if (!(odev->flags & IFF_UP) || !netif_carrier_ok(odev))
368 goto drop;
369
370 skb_orphan(skb);
371
372 if (skb_warn_if_lro(skb))
373 goto drop;
374
375 skb_forward_csum(skb);
376
377 if (skb->len - ETH_HLEN > odev->mtu)
378 goto drop;
379
380 skb->dev = odev;
381 skb->protocol = eth->h_proto;
382
383 return dev_queue_xmit(skb);
384
385drop:
386 kfree_skb(skb);
387 return -EINVAL;
388}
389
7a3f5b0d
RS		 390static int input_action_end_dx6_finish(struct net *net, struct sock *sk,
391 struct sk_buff *skb)
392{
393 struct dst_entry *orig_dst = skb_dst(skb);
394 struct in6_addr *nhaddr = NULL;
395 struct seg6_local_lwt *slwt;
396
397 slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
398
399 /* The inner packet is not associated to any local interface,
400 * so we do not call netif_rx().
401 *
402 * If slwt->nh6 is set to ::, then lookup the nexthop for the
403 * inner packet's DA. Otherwise, use the specified nexthop.
404 */
405 if (!ipv6_addr_any(&slwt->nh6))
406 nhaddr = &slwt->nh6;
407
408 seg6_lookup_nexthop(skb, nhaddr, 0);
409
410 return dst_input(skb);
411}
412
140f04c3
DL		 413/* decapsulate and forward to specified nexthop */
414static int input_action_end_dx6(struct sk_buff *skb,
415 struct seg6_local_lwt *slwt)
416{
140f04c3
DL		 417 /* this function accepts IPv6 encapsulated packets, with either
418 * an SRH with SL=0, or no SRH.
419 */
420
d7a669dd 421 if (!decap_and_validate(skb, IPPROTO_IPV6))
140f04c3 422 goto drop;
140f04c3 423
d7a669dd 424 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
140f04c3
DL		 425 goto drop;
426
c71644d0 427 skb_set_transport_header(skb, sizeof(struct ipv6hdr));
7a3f5b0d 428 nf_reset_ct(skb);
c71644d0 429
7a3f5b0d
RS		 430 if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled))
431 return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
432 dev_net(skb->dev), NULL, skb, NULL,
433 skb_dst(skb)->dev, input_action_end_dx6_finish);
140f04c3 434
7a3f5b0d 435 return input_action_end_dx6_finish(dev_net(skb->dev), NULL, skb);
140f04c3
DL		 436drop:
437 kfree_skb(skb);
438 return -EINVAL;
439}
440
7a3f5b0d
RS		 441static int input_action_end_dx4_finish(struct net *net, struct sock *sk,
442 struct sk_buff *skb)
891ef8dd 443{
7a3f5b0d
RS		 444 struct dst_entry *orig_dst = skb_dst(skb);
445 struct seg6_local_lwt *slwt;
891ef8dd
DL		 446 struct iphdr *iph;
447 __be32 nhaddr;
448 int err;
449
7a3f5b0d 450 slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
891ef8dd
DL		 451
452 iph = ip_hdr(skb);
453
454 nhaddr = slwt->nh4.s_addr ?: iph->daddr;
455
456 skb_dst_drop(skb);
457
458 err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);
7a3f5b0d
RS		 459 if (err) {
460 kfree_skb(skb);
461 return -EINVAL;
462 }
891ef8dd
DL		 463
464 return dst_input(skb);
7a3f5b0d
RS		 465}
466
467static int input_action_end_dx4(struct sk_buff *skb,
468 struct seg6_local_lwt *slwt)
469{
470 if (!decap_and_validate(skb, IPPROTO_IPIP))
471 goto drop;
472
473 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
474 goto drop;
475
476 skb->protocol = htons(ETH_P_IP);
477 skb_set_transport_header(skb, sizeof(struct iphdr));
478 nf_reset_ct(skb);
479
480 if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled))
481 return NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING,
482 dev_net(skb->dev), NULL, skb, NULL,
483 skb_dst(skb)->dev, input_action_end_dx4_finish);
891ef8dd 484
7a3f5b0d 485 return input_action_end_dx4_finish(dev_net(skb->dev), NULL, skb);
891ef8dd
DL		 486drop:
487 kfree_skb(skb);
488 return -EINVAL;
489}
490
664d6f86
AM		 491#ifdef CONFIG_NET_L3_MASTER_DEV
492static struct net *fib6_config_get_net(const struct fib6_config *fib6_cfg)
493{
494 const struct nl_info *nli = &fib6_cfg->fc_nlinfo;
495
496 return nli->nl_net;
497}
498
499static int __seg6_end_dt_vrf_build(struct seg6_local_lwt *slwt, const void *cfg,
500 u16 family, struct netlink_ext_ack *extack)
501{
502 struct seg6_end_dt_info *info = &slwt->dt_info;
503 int vrf_ifindex;
504 struct net *net;
505
506 net = fib6_config_get_net(cfg);
507
508 /* note that vrf_table was already set by parse_nla_vrftable() */
509 vrf_ifindex = l3mdev_ifindex_lookup_by_table_id(L3MDEV_TYPE_VRF, net,
510 info->vrf_table);
511 if (vrf_ifindex < 0) {
512 if (vrf_ifindex == -EPERM) {
513 NL_SET_ERR_MSG(extack,
514 "Strict mode for VRF is disabled");
515 } else if (vrf_ifindex == -ENODEV) {
516 NL_SET_ERR_MSG(extack,
517 "Table has no associated VRF device");
518 } else {
519 pr_debug("seg6local: SRv6 End.DT* creation error=%d\n",
520 vrf_ifindex);
521 }
522
523 return vrf_ifindex;
524 }
525
526 info->net = net;
527 info->vrf_ifindex = vrf_ifindex;
528
664d6f86
AM		 529 info->family = family;
530 info->mode = DT_VRF_MODE;
531
532 return 0;
533}
534
535/* The SRv6 End.DT4/DT6 behavior extracts the inner (IPv4/IPv6) packet and
536 * routes the IPv4/IPv6 packet by looking at the configured routing table.
537 *
538 * In the SRv6 End.DT4/DT6 use case, we can receive traffic (IPv6+Segment
539 * Routing Header packets) from several interfaces and the outer IPv6
540 * destination address (DA) is used for retrieving the specific instance of the
541 * End.DT4/DT6 behavior that should process the packets.
542 *
543 * However, the inner IPv4/IPv6 packet is not really bound to any receiving
544 * interface and thus the End.DT4/DT6 sets the VRF (associated with the
545 * corresponding routing table) as the *receiving* interface.
546 * In other words, the End.DT4/DT6 processes a packet as if it has been received
547 * directly by the VRF (and not by one of its slave devices, if any).
548 * In this way, the VRF interface is used for routing the IPv4/IPv6 packet in
549 * according to the routing table configured by the End.DT4/DT6 instance.
550 *
551 * This design allows you to get some interesting features like:
552 * 1) the statistics on rx packets;
553 * 2) the possibility to install a packet sniffer on the receiving interface
554 * (the VRF one) for looking at the incoming packets;
555 * 3) the possibility to leverage the netfilter prerouting hook for the inner
556 * IPv4 packet.
557 *
558 * This function returns:
559 * - the sk_buff* when the VRF rcv handler has processed the packet correctly;
560 * - NULL when the skb is consumed by the VRF rcv handler;
561 * - a pointer which encodes a negative error number in case of error.
562 * Note that in this case, the function takes care of freeing the skb.
563 */
564static struct sk_buff *end_dt_vrf_rcv(struct sk_buff *skb, u16 family,
565 struct net_device *dev)
566{
567 /* based on l3mdev_ip_rcv; we are only interested in the master */
568 if (unlikely(!netif_is_l3_master(dev) && !netif_has_l3_rx_handler(dev)))
569 goto drop;
570
571 if (unlikely(!dev->l3mdev_ops->l3mdev_l3_rcv))
572 goto drop;
573
574 /* the decap packet IPv4/IPv6 does not come with any mac header info.
575 * We must unset the mac header to allow the VRF device to rebuild it,
576 * just in case there is a sniffer attached on the device.
577 */
578 skb_unset_mac_header(skb);
579
580 skb = dev->l3mdev_ops->l3mdev_l3_rcv(dev, skb, family);
581 if (!skb)
582 /* the skb buffer was consumed by the handler */
583 return NULL;
584
585 /* when a packet is received by a VRF or by one of its slaves, the
586 * master device reference is set into the skb.
587 */
588 if (unlikely(skb->dev != dev || skb->skb_iif != dev->ifindex))
589 goto drop;
590
591 return skb;
592
593drop:
594 kfree_skb(skb);
595 return ERR_PTR(-EINVAL);
596}
597
598static struct net_device *end_dt_get_vrf_rcu(struct sk_buff *skb,
599 struct seg6_end_dt_info *info)
600{
601 int vrf_ifindex = info->vrf_ifindex;
602 struct net *net = info->net;
603
604 if (unlikely(vrf_ifindex < 0))
605 goto error;
606
607 if (unlikely(!net_eq(dev_net(skb->dev), net)))
608 goto error;
609
610 return dev_get_by_index_rcu(net, vrf_ifindex);
611
612error:
613 return NULL;
614}
615
616static struct sk_buff *end_dt_vrf_core(struct sk_buff *skb,
8b532109 617 struct seg6_local_lwt *slwt, u16 family)
664d6f86
AM		 618{
619 struct seg6_end_dt_info *info = &slwt->dt_info;
620 struct net_device *vrf;
8b532109
AM		 621 __be16 protocol;
622 int hdrlen;
664d6f86
AM		 623
624 vrf = end_dt_get_vrf_rcu(skb, info);
625 if (unlikely(!vrf))
626 goto drop;
627
8b532109
AM		 628 switch (family) {
629 case AF_INET:
630 protocol = htons(ETH_P_IP);
631 hdrlen = sizeof(struct iphdr);
632 break;
633 case AF_INET6:
634 protocol = htons(ETH_P_IPV6);
635 hdrlen = sizeof(struct ipv6hdr);
636 break;
637 case AF_UNSPEC:
638 fallthrough;
639 default:
640 goto drop;
641 }
642
643 if (unlikely(info->family != AF_UNSPEC && info->family != family)) {
644 pr_warn_once("seg6local: SRv6 End.DT* family mismatch");
645 goto drop;
646 }
647
648 skb->protocol = protocol;
664d6f86
AM		 649
650 skb_dst_drop(skb);
651
8b532109 652 skb_set_transport_header(skb, hdrlen);
7a3f5b0d 653 nf_reset_ct(skb);
664d6f86 654
8b532109 655 return end_dt_vrf_rcv(skb, family, vrf);
664d6f86
AM		 656
657drop:
658 kfree_skb(skb);
659 return ERR_PTR(-EINVAL);
660}
661
662static int input_action_end_dt4(struct sk_buff *skb,
663 struct seg6_local_lwt *slwt)
664{
665 struct iphdr *iph;
666 int err;
667
668 if (!decap_and_validate(skb, IPPROTO_IPIP))
669 goto drop;
670
671 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
672 goto drop;
673
8b532109 674 skb = end_dt_vrf_core(skb, slwt, AF_INET);
664d6f86
AM		 675 if (!skb)
676 /* packet has been processed and consumed by the VRF */
677 return 0;
678
679 if (IS_ERR(skb))
680 return PTR_ERR(skb);
681
682 iph = ip_hdr(skb);
683
684 err = ip_route_input(skb, iph->daddr, iph->saddr, 0, skb->dev);
685 if (unlikely(err))
686 goto drop;
687
688 return dst_input(skb);
689
690drop:
691 kfree_skb(skb);
692 return -EINVAL;
693}
694
695static int seg6_end_dt4_build(struct seg6_local_lwt *slwt, const void *cfg,
696 struct netlink_ext_ack *extack)
697{
698 return __seg6_end_dt_vrf_build(slwt, cfg, AF_INET, extack);
699}
20a081b7
AM		 700
701static enum
702seg6_end_dt_mode seg6_end_dt6_parse_mode(struct seg6_local_lwt *slwt)
703{
704 unsigned long parsed_optattrs = slwt->parsed_optattrs;
705 bool legacy, vrfmode;
706
300a0fd8
AM		 707 legacy = !!(parsed_optattrs & SEG6_F_ATTR(SEG6_LOCAL_TABLE));
708 vrfmode = !!(parsed_optattrs & SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE));
20a081b7
AM		 709
710 if (!(legacy ^ vrfmode))
711 /* both are absent or present: invalid DT6 mode */
712 return DT_INVALID_MODE;
713
714 return legacy ? DT_LEGACY_MODE : DT_VRF_MODE;
715}
716
717static enum seg6_end_dt_mode seg6_end_dt6_get_mode(struct seg6_local_lwt *slwt)
718{
719 struct seg6_end_dt_info *info = &slwt->dt_info;
720
721 return info->mode;
722}
723
724static int seg6_end_dt6_build(struct seg6_local_lwt *slwt, const void *cfg,
725 struct netlink_ext_ack *extack)
726{
727 enum seg6_end_dt_mode mode = seg6_end_dt6_parse_mode(slwt);
728 struct seg6_end_dt_info *info = &slwt->dt_info;
729
730 switch (mode) {
731 case DT_LEGACY_MODE:
732 info->mode = DT_LEGACY_MODE;
733 return 0;
734 case DT_VRF_MODE:
735 return __seg6_end_dt_vrf_build(slwt, cfg, AF_INET6, extack);
736 default:
737 NL_SET_ERR_MSG(extack, "table or vrftable must be specified");
738 return -EINVAL;
739 }
740}
664d6f86
AM		 741#endif
742
891ef8dd
DL		 743static int input_action_end_dt6(struct sk_buff *skb,
744 struct seg6_local_lwt *slwt)
745{
746 if (!decap_and_validate(skb, IPPROTO_IPV6))
747 goto drop;
748
749 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
750 goto drop;
751
20a081b7
AM		 752#ifdef CONFIG_NET_L3_MASTER_DEV
753 if (seg6_end_dt6_get_mode(slwt) == DT_LEGACY_MODE)
754 goto legacy_mode;
755
756 /* DT6_VRF_MODE */
8b532109 757 skb = end_dt_vrf_core(skb, slwt, AF_INET6);
20a081b7
AM		 758 if (!skb)
759 /* packet has been processed and consumed by the VRF */
760 return 0;
761
762 if (IS_ERR(skb))
763 return PTR_ERR(skb);
764
765 /* note: this time we do not need to specify the table because the VRF
766 * takes care of selecting the correct table.
767 */
768 seg6_lookup_any_nexthop(skb, NULL, 0, true);
769
770 return dst_input(skb);
771
772legacy_mode:
773#endif
c71644d0
AM		 774 skb_set_transport_header(skb, sizeof(struct ipv6hdr));
775
fd1fef0c 776 seg6_lookup_any_nexthop(skb, NULL, slwt->table, true);
891ef8dd
DL		 777
778 return dst_input(skb);
779
780drop:
781 kfree_skb(skb);
782 return -EINVAL;
783}
784
8b532109
AM		 785#ifdef CONFIG_NET_L3_MASTER_DEV
786static int seg6_end_dt46_build(struct seg6_local_lwt *slwt, const void *cfg,
787 struct netlink_ext_ack *extack)
788{
789 return __seg6_end_dt_vrf_build(slwt, cfg, AF_UNSPEC, extack);
790}
791
792static int input_action_end_dt46(struct sk_buff *skb,
793 struct seg6_local_lwt *slwt)
794{
795 unsigned int off = 0;
796 int nexthdr;
797
798 nexthdr = ipv6_find_hdr(skb, &off, -1, NULL, NULL);
799 if (unlikely(nexthdr < 0))
800 goto drop;
801
802 switch (nexthdr) {
803 case IPPROTO_IPIP:
804 return input_action_end_dt4(skb, slwt);
805 case IPPROTO_IPV6:
806 return input_action_end_dt6(skb, slwt);
807 }
808
809drop:
810 kfree_skb(skb);
811 return -EINVAL;
812}
813#endif
814
140f04c3
DL		 815/* push an SRH on top of the current one */
816static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
817{
818 struct ipv6_sr_hdr *srh;
819 int err = -EINVAL;
820
821 srh = get_and_validate_srh(skb);
822 if (!srh)
823 goto drop;
824
825 err = seg6_do_srh_inline(skb, slwt->srh);
826 if (err)
827 goto drop;
828
140f04c3
DL		 829 skb_set_transport_header(skb, sizeof(struct ipv6hdr));
830
1c1e761e 831 seg6_lookup_nexthop(skb, NULL, 0);
140f04c3
DL		 832
833 return dst_input(skb);
834
835drop:
836 kfree_skb(skb);
837 return err;
838}
839
840/* encapsulate within an outer IPv6 header and a specified SRH */
841static int input_action_end_b6_encap(struct sk_buff *skb,
842 struct seg6_local_lwt *slwt)
843{
844 struct ipv6_sr_hdr *srh;
140f04c3
DL		 845 int err = -EINVAL;
846
847 srh = get_and_validate_srh(skb);
848 if (!srh)
849 goto drop;
850
d7a669dd 851 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
140f04c3
DL		 852
853 skb_reset_inner_headers(skb);
854 skb->encapsulation = 1;
855
32d99d0b 856 err = seg6_do_srh_encap(skb, slwt->srh, IPPROTO_IPV6);
140f04c3
DL		 857 if (err)
858 goto drop;
859
140f04c3
DL		 860 skb_set_transport_header(skb, sizeof(struct ipv6hdr));
861
1c1e761e 862 seg6_lookup_nexthop(skb, NULL, 0);
140f04c3
DL		 863
864 return dst_input(skb);
865
866drop:
867 kfree_skb(skb);
868 return err;
869}
870
fe94cc29
MX		 871DEFINE_PER_CPU(struct seg6_bpf_srh_state, seg6_bpf_srh_states);
872
486cdf21
MX		 873bool seg6_bpf_has_valid_srh(struct sk_buff *skb)
874{
875 struct seg6_bpf_srh_state *srh_state =
876 this_cpu_ptr(&seg6_bpf_srh_states);
877 struct ipv6_sr_hdr *srh = srh_state->srh;
878
879 if (unlikely(srh == NULL))
880 return false;
881
882 if (unlikely(!srh_state->valid)) {
883 if ((srh_state->hdrlen & 7) != 0)
884 return false;
885
886 srh->hdrlen = (u8)(srh_state->hdrlen >> 3);
bb986a50 887 if (!seg6_validate_srh(srh, (srh->hdrlen + 1) << 3, true))
486cdf21
MX		 888 return false;
889
890 srh_state->valid = true;
891 }
892
893 return true;
894}
895
004d4b27
MX		 896static int input_action_end_bpf(struct sk_buff *skb,
897 struct seg6_local_lwt *slwt)
898{
899 struct seg6_bpf_srh_state *srh_state =
900 this_cpu_ptr(&seg6_bpf_srh_states);
004d4b27 901 struct ipv6_sr_hdr *srh;
004d4b27
MX		 902 int ret;
903
904 srh = get_and_validate_srh(skb);
486cdf21
MX		 905 if (!srh) {
906 kfree_skb(skb);
907 return -EINVAL;
908 }
004d4b27
MX		 909 advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
910
911 /* preempt_disable is needed to protect the per-CPU buffer srh_state,
912 * which is also accessed by the bpf_lwt_seg6_* helpers
913 */
914 preempt_disable();
486cdf21 915 srh_state->srh = srh;
004d4b27 916 srh_state->hdrlen = srh->hdrlen << 3;
486cdf21 917 srh_state->valid = true;
004d4b27
MX		 918
919 rcu_read_lock();
920 bpf_compute_data_pointers(skb);
921 ret = bpf_prog_run_save_cb(slwt->bpf.prog, skb);
922 rcu_read_unlock();
923
004d4b27
MX		 924 switch (ret) {
925 case BPF_OK:
926 case BPF_REDIRECT:
927 break;
928 case BPF_DROP:
929 goto drop;
930 default:
931 pr_warn_once("bpf-seg6local: Illegal return value %u\n", ret);
932 goto drop;
933 }
934
486cdf21 935 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
004d4b27
MX		 936 goto drop;
937
486cdf21 938 preempt_enable();
004d4b27
MX		 939 if (ret != BPF_REDIRECT)
940 seg6_lookup_nexthop(skb, NULL, 0);
941
942 return dst_input(skb);
943
944drop:
486cdf21 945 preempt_enable();
004d4b27
MX		 946 kfree_skb(skb);
947 return -EINVAL;
948}
949
d1df6fd8
DL		 950static struct seg6_action_desc seg6_action_table[] = {
951 {
952 .action = SEG6_LOCAL_ACTION_END,
953 .attrs = 0,
94604548 954 .optattrs = SEG6_F_LOCAL_COUNTERS,
140f04c3
DL		 955 .input = input_action_end,
956 },
957 {
958 .action = SEG6_LOCAL_ACTION_END_X,
300a0fd8 959 .attrs = SEG6_F_ATTR(SEG6_LOCAL_NH6),
94604548 960 .optattrs = SEG6_F_LOCAL_COUNTERS,
140f04c3 961 .input = input_action_end_x,
d1df6fd8 962 },
891ef8dd
DL		 963 {
964 .action = SEG6_LOCAL_ACTION_END_T,
300a0fd8 965 .attrs = SEG6_F_ATTR(SEG6_LOCAL_TABLE),
94604548 966 .optattrs = SEG6_F_LOCAL_COUNTERS,
891ef8dd
DL		 967 .input = input_action_end_t,
968 },
969 {
970 .action = SEG6_LOCAL_ACTION_END_DX2,
300a0fd8 971 .attrs = SEG6_F_ATTR(SEG6_LOCAL_OIF),
94604548 972 .optattrs = SEG6_F_LOCAL_COUNTERS,
891ef8dd
DL		 973 .input = input_action_end_dx2,
974 },
140f04c3
DL		 975 {
976 .action = SEG6_LOCAL_ACTION_END_DX6,
300a0fd8 977 .attrs = SEG6_F_ATTR(SEG6_LOCAL_NH6),
94604548 978 .optattrs = SEG6_F_LOCAL_COUNTERS,
140f04c3
DL		 979 .input = input_action_end_dx6,
980 },
891ef8dd
DL		 981 {
982 .action = SEG6_LOCAL_ACTION_END_DX4,
300a0fd8 983 .attrs = SEG6_F_ATTR(SEG6_LOCAL_NH4),
94604548 984 .optattrs = SEG6_F_LOCAL_COUNTERS,
891ef8dd
DL		 985 .input = input_action_end_dx4,
986 },
664d6f86
AM		 987 {
988 .action = SEG6_LOCAL_ACTION_END_DT4,
300a0fd8 989 .attrs = SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE),
94604548 990 .optattrs = SEG6_F_LOCAL_COUNTERS,
664d6f86
AM		 991#ifdef CONFIG_NET_L3_MASTER_DEV
992 .input = input_action_end_dt4,
993 .slwt_ops = {
994 .build_state = seg6_end_dt4_build,
995 },
996#endif
997 },
891ef8dd
DL		 998 {
999 .action = SEG6_LOCAL_ACTION_END_DT6,
20a081b7
AM		 1000#ifdef CONFIG_NET_L3_MASTER_DEV
1001 .attrs = 0,
94604548
AM		 1002 .optattrs = SEG6_F_LOCAL_COUNTERS |
1003 SEG6_F_ATTR(SEG6_LOCAL_TABLE) |
300a0fd8 1004 SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE),
20a081b7
AM		 1005 .slwt_ops = {
1006 .build_state = seg6_end_dt6_build,
1007 },
1008#else
300a0fd8 1009 .attrs = SEG6_F_ATTR(SEG6_LOCAL_TABLE),
94604548 1010 .optattrs = SEG6_F_LOCAL_COUNTERS,
20a081b7 1011#endif
891ef8dd
DL		 1012 .input = input_action_end_dt6,
1013 },
8b532109
AM		 1014 {
1015 .action = SEG6_LOCAL_ACTION_END_DT46,
1016 .attrs = SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE),
1017 .optattrs = SEG6_F_LOCAL_COUNTERS,
1018#ifdef CONFIG_NET_L3_MASTER_DEV
1019 .input = input_action_end_dt46,
1020 .slwt_ops = {
1021 .build_state = seg6_end_dt46_build,
1022 },
1023#endif
1024 },
140f04c3
DL		 1025 {
1026 .action = SEG6_LOCAL_ACTION_END_B6,
300a0fd8 1027 .attrs = SEG6_F_ATTR(SEG6_LOCAL_SRH),
94604548 1028 .optattrs = SEG6_F_LOCAL_COUNTERS,
140f04c3
DL		 1029 .input = input_action_end_b6,
1030 },
1031 {
1032 .action = SEG6_LOCAL_ACTION_END_B6_ENCAP,
300a0fd8 1033 .attrs = SEG6_F_ATTR(SEG6_LOCAL_SRH),
94604548 1034 .optattrs = SEG6_F_LOCAL_COUNTERS,
140f04c3
DL		 1035 .input = input_action_end_b6_encap,
1036 .static_headroom = sizeof(struct ipv6hdr),
004d4b27
MX		 1037 },
1038 {
1039 .action = SEG6_LOCAL_ACTION_END_BPF,
300a0fd8 1040 .attrs = SEG6_F_ATTR(SEG6_LOCAL_BPF),
94604548 1041 .optattrs = SEG6_F_LOCAL_COUNTERS,
004d4b27
MX		 1042 .input = input_action_end_bpf,
1043 },
1044
d1df6fd8
DL		 1045};
1046
1047static struct seg6_action_desc *__get_action_desc(int action)
1048{
1049 struct seg6_action_desc *desc;
1050 int i, count;
1051
709af180 1052 count = ARRAY_SIZE(seg6_action_table);
d1df6fd8
DL		 1053 for (i = 0; i < count; i++) {
1054 desc = &seg6_action_table[i];
1055 if (desc->action == action)
1056 return desc;
1057 }
1058
1059 return NULL;
1060}
1061
94604548
AM		 1062static bool seg6_lwtunnel_counters_enabled(struct seg6_local_lwt *slwt)
1063{
1064 return slwt->parsed_optattrs & SEG6_F_LOCAL_COUNTERS;
1065}
1066
1067static void seg6_local_update_counters(struct seg6_local_lwt *slwt,
1068 unsigned int len, int err)
1069{
1070 struct pcpu_seg6_local_counters *pcounters;
1071
1072 pcounters = this_cpu_ptr(slwt->pcpu_counters);
1073 u64_stats_update_begin(&pcounters->syncp);
1074
1075 if (likely(!err)) {
1076 u64_stats_inc(&pcounters->packets);
1077 u64_stats_add(&pcounters->bytes, len);
1078 } else {
1079 u64_stats_inc(&pcounters->errors);
1080 }
1081
1082 u64_stats_update_end(&pcounters->syncp);
1083}
1084
7a3f5b0d
RS		 1085static int seg6_local_input_core(struct net *net, struct sock *sk,
1086 struct sk_buff *skb)
d1df6fd8
DL		 1087{
1088 struct dst_entry *orig_dst = skb_dst(skb);
1089 struct seg6_action_desc *desc;
1090 struct seg6_local_lwt *slwt;
94604548
AM		 1091 unsigned int len = skb->len;
1092 int rc;
d1df6fd8
DL		 1093
1094 slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
1095 desc = slwt->desc;
1096
94604548
AM		 1097 rc = desc->input(skb, slwt);
1098
1099 if (!seg6_lwtunnel_counters_enabled(slwt))
1100 return rc;
1101
1102 seg6_local_update_counters(slwt, len, rc);
1103
1104 return rc;
d1df6fd8
DL		 1105}
1106
7a3f5b0d
RS		 1107static int seg6_local_input(struct sk_buff *skb)
1108{
1109 if (skb->protocol != htons(ETH_P_IPV6)) {
1110 kfree_skb(skb);
1111 return -EINVAL;
1112 }
1113
1114 if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled))
1115 return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN,
1116 dev_net(skb->dev), NULL, skb, skb->dev, NULL,
1117 seg6_local_input_core);
1118
1119 return seg6_local_input_core(dev_net(skb->dev), NULL, skb);
1120}
1121
d1df6fd8
DL		 1122static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = {
1123 [SEG6_LOCAL_ACTION] = { .type = NLA_U32 },
1124 [SEG6_LOCAL_SRH] = { .type = NLA_BINARY },
1125 [SEG6_LOCAL_TABLE] = { .type = NLA_U32 },
664d6f86 1126 [SEG6_LOCAL_VRFTABLE] = { .type = NLA_U32 },
d1df6fd8
DL		 1127 [SEG6_LOCAL_NH4] = { .type = NLA_BINARY,
1128 .len = sizeof(struct in_addr) },
1129 [SEG6_LOCAL_NH6] = { .type = NLA_BINARY,
1130 .len = sizeof(struct in6_addr) },
1131 [SEG6_LOCAL_IIF] = { .type = NLA_U32 },
1132 [SEG6_LOCAL_OIF] = { .type = NLA_U32 },
004d4b27 1133 [SEG6_LOCAL_BPF] = { .type = NLA_NESTED },
94604548 1134 [SEG6_LOCAL_COUNTERS] = { .type = NLA_NESTED },
d1df6fd8
DL		 1135};
1136
2d9cc60a
DL		 1137static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt)
1138{
1139 struct ipv6_sr_hdr *srh;
1140 int len;
1141
1142 srh = nla_data(attrs[SEG6_LOCAL_SRH]);
1143 len = nla_len(attrs[SEG6_LOCAL_SRH]);
1144
1145 /* SRH must contain at least one segment */
1146 if (len < sizeof(*srh) + sizeof(struct in6_addr))
1147 return -EINVAL;
1148
bb986a50 1149 if (!seg6_validate_srh(srh, len, false))
2d9cc60a
DL		 1150 return -EINVAL;
1151
7fa41efa 1152 slwt->srh = kmemdup(srh, len, GFP_KERNEL);
2d9cc60a
DL		 1153 if (!slwt->srh)
1154 return -ENOMEM;
1155
2d9cc60a
DL		 1156 slwt->headroom += len;
1157
1158 return 0;
1159}
1160
1161static int put_nla_srh(struct sk_buff *skb, struct seg6_local_lwt *slwt)
1162{
1163 struct ipv6_sr_hdr *srh;
1164 struct nlattr *nla;
1165 int len;
1166
1167 srh = slwt->srh;
1168 len = (srh->hdrlen + 1) << 3;
1169
1170 nla = nla_reserve(skb, SEG6_LOCAL_SRH, len);
1171 if (!nla)
1172 return -EMSGSIZE;
1173
1174 memcpy(nla_data(nla), srh, len);
1175
1176 return 0;
1177}
1178
1179static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
1180{
1181 int len = (a->srh->hdrlen + 1) << 3;
1182
1183 if (len != ((b->srh->hdrlen + 1) << 3))
1184 return 1;
1185
1186 return memcmp(a->srh, b->srh, len);
1187}
1188
964adce5
AM		 1189static void destroy_attr_srh(struct seg6_local_lwt *slwt)
1190{
1191 kfree(slwt->srh);
1192}
1193
2d9cc60a
DL		 1194static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt)
1195{
1196 slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]);
1197
1198 return 0;
1199}
1200
1201static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt)
1202{
1203 if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table))
1204 return -EMSGSIZE;
1205
1206 return 0;
1207}
1208
1209static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
1210{
1211 if (a->table != b->table)
1212 return 1;
1213
1214 return 0;
1215}
1216
664d6f86
AM		 1217static struct
1218seg6_end_dt_info *seg6_possible_end_dt_info(struct seg6_local_lwt *slwt)
1219{
1220#ifdef CONFIG_NET_L3_MASTER_DEV
1221 return &slwt->dt_info;
1222#else
1223 return ERR_PTR(-EOPNOTSUPP);
1224#endif
1225}
1226
1227static int parse_nla_vrftable(struct nlattr **attrs,
1228 struct seg6_local_lwt *slwt)
1229{
1230 struct seg6_end_dt_info *info = seg6_possible_end_dt_info(slwt);
1231
1232 if (IS_ERR(info))
1233 return PTR_ERR(info);
1234
1235 info->vrf_table = nla_get_u32(attrs[SEG6_LOCAL_VRFTABLE]);
1236
1237 return 0;
1238}
1239
1240static int put_nla_vrftable(struct sk_buff *skb, struct seg6_local_lwt *slwt)
1241{
1242 struct seg6_end_dt_info *info = seg6_possible_end_dt_info(slwt);
1243
1244 if (IS_ERR(info))
1245 return PTR_ERR(info);
1246
1247 if (nla_put_u32(skb, SEG6_LOCAL_VRFTABLE, info->vrf_table))
1248 return -EMSGSIZE;
1249
1250 return 0;
1251}
1252
1253static int cmp_nla_vrftable(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
1254{
1255 struct seg6_end_dt_info *info_a = seg6_possible_end_dt_info(a);
1256 struct seg6_end_dt_info *info_b = seg6_possible_end_dt_info(b);
1257
1258 if (info_a->vrf_table != info_b->vrf_table)
1259 return 1;
1260
1261 return 0;
1262}
1263
2d9cc60a
DL		 1264static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt)
1265{
1266 memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]),
1267 sizeof(struct in_addr));
1268
1269 return 0;
1270}
1271
1272static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt)
1273{
1274 struct nlattr *nla;
1275
1276 nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr));
1277 if (!nla)
1278 return -EMSGSIZE;
1279
1280 memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr));
1281
1282 return 0;
1283}
1284
1285static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
1286{
1287 return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr));
1288}
1289
1290static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt)
1291{
1292 memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]),
1293 sizeof(struct in6_addr));
1294
1295 return 0;
1296}
1297
1298static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
1299{
1300 struct nlattr *nla;
1301
1302 nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr));
1303 if (!nla)
1304 return -EMSGSIZE;
1305
1306 memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr));
1307
1308 return 0;
1309}
1310
1311static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
1312{
1313 return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr));
1314}
1315
1316static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
1317{
1318 slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]);
1319
1320 return 0;
1321}
1322
1323static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
1324{
1325 if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif))
1326 return -EMSGSIZE;
1327
1328 return 0;
1329}
1330
1331static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
1332{
1333 if (a->iif != b->iif)
1334 return 1;
1335
1336 return 0;
1337}
1338
1339static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
1340{
1341 slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]);
1342
1343 return 0;
1344}
1345
1346static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
1347{
1348 if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif))
1349 return -EMSGSIZE;
1350
1351 return 0;
1352}
1353
1354static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
1355{
1356 if (a->oif != b->oif)
1357 return 1;
1358
1359 return 0;
1360}
1361
004d4b27
MX		 1362#define MAX_PROG_NAME 256
1363static const struct nla_policy bpf_prog_policy[SEG6_LOCAL_BPF_PROG_MAX + 1] = {
1364 [SEG6_LOCAL_BPF_PROG] = { .type = NLA_U32, },
1365 [SEG6_LOCAL_BPF_PROG_NAME] = { .type = NLA_NUL_STRING,
1366 .len = MAX_PROG_NAME },
1367};
1368
1369static int parse_nla_bpf(struct nlattr **attrs, struct seg6_local_lwt *slwt)
1370{
1371 struct nlattr *tb[SEG6_LOCAL_BPF_PROG_MAX + 1];
1372 struct bpf_prog *p;
1373 int ret;
1374 u32 fd;
1375
8cb08174
JB		 1376 ret = nla_parse_nested_deprecated(tb, SEG6_LOCAL_BPF_PROG_MAX,
1377 attrs[SEG6_LOCAL_BPF],
1378 bpf_prog_policy, NULL);
004d4b27
MX		 1379 if (ret < 0)
1380 return ret;
1381
1382 if (!tb[SEG6_LOCAL_BPF_PROG] || !tb[SEG6_LOCAL_BPF_PROG_NAME])
1383 return -EINVAL;
1384
1385 slwt->bpf.name = nla_memdup(tb[SEG6_LOCAL_BPF_PROG_NAME], GFP_KERNEL);
1386 if (!slwt->bpf.name)
1387 return -ENOMEM;
1388
1389 fd = nla_get_u32(tb[SEG6_LOCAL_BPF_PROG]);
1390 p = bpf_prog_get_type(fd, BPF_PROG_TYPE_LWT_SEG6LOCAL);
1391 if (IS_ERR(p)) {
1392 kfree(slwt->bpf.name);
1393 return PTR_ERR(p);
1394 }
1395
1396 slwt->bpf.prog = p;
1397 return 0;
1398}
1399
1400static int put_nla_bpf(struct sk_buff *skb, struct seg6_local_lwt *slwt)
1401{
1402 struct nlattr *nest;
1403
1404 if (!slwt->bpf.prog)
1405 return 0;
1406
ae0be8de 1407 nest = nla_nest_start_noflag(skb, SEG6_LOCAL_BPF);
004d4b27
MX		 1408 if (!nest)
1409 return -EMSGSIZE;
1410
1411 if (nla_put_u32(skb, SEG6_LOCAL_BPF_PROG, slwt->bpf.prog->aux->id))
1412 return -EMSGSIZE;
1413
1414 if (slwt->bpf.name &&
1415 nla_put_string(skb, SEG6_LOCAL_BPF_PROG_NAME, slwt->bpf.name))
1416 return -EMSGSIZE;
1417
1418 return nla_nest_end(skb, nest);
1419}
1420
1421static int cmp_nla_bpf(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
1422{
1423 if (!a->bpf.name && !b->bpf.name)
1424 return 0;
1425
1426 if (!a->bpf.name || !b->bpf.name)
1427 return 1;
1428
1429 return strcmp(a->bpf.name, b->bpf.name);
1430}
1431
964adce5
AM		 1432static void destroy_attr_bpf(struct seg6_local_lwt *slwt)
1433{
1434 kfree(slwt->bpf.name);
1435 if (slwt->bpf.prog)
1436 bpf_prog_put(slwt->bpf.prog);
1437}
1438
94604548
AM		 1439static const struct
1440nla_policy seg6_local_counters_policy[SEG6_LOCAL_CNT_MAX + 1] = {
1441 [SEG6_LOCAL_CNT_PACKETS] = { .type = NLA_U64 },
1442 [SEG6_LOCAL_CNT_BYTES] = { .type = NLA_U64 },
1443 [SEG6_LOCAL_CNT_ERRORS] = { .type = NLA_U64 },
1444};
1445
1446static int parse_nla_counters(struct nlattr **attrs,
1447 struct seg6_local_lwt *slwt)
1448{
1449 struct pcpu_seg6_local_counters __percpu *pcounters;
1450 struct nlattr *tb[SEG6_LOCAL_CNT_MAX + 1];
1451 int ret;
1452
1453 ret = nla_parse_nested_deprecated(tb, SEG6_LOCAL_CNT_MAX,
1454 attrs[SEG6_LOCAL_COUNTERS],
1455 seg6_local_counters_policy, NULL);
1456 if (ret < 0)
1457 return ret;
1458
1459 /* basic support for SRv6 Behavior counters requires at least:
1460 * packets, bytes and errors.
1461 */
1462 if (!tb[SEG6_LOCAL_CNT_PACKETS] || !tb[SEG6_LOCAL_CNT_BYTES] ||
1463 !tb[SEG6_LOCAL_CNT_ERRORS])
1464 return -EINVAL;
1465
1466 /* counters are always zero initialized */
1467 pcounters = seg6_local_alloc_pcpu_counters(GFP_KERNEL);
1468 if (!pcounters)
1469 return -ENOMEM;
1470
1471 slwt->pcpu_counters = pcounters;
1472
1473 return 0;
1474}
1475
1476static int seg6_local_fill_nla_counters(struct sk_buff *skb,
1477 struct seg6_local_counters *counters)
1478{
1479 if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_PACKETS, counters->packets,
1480 SEG6_LOCAL_CNT_PAD))
1481 return -EMSGSIZE;
1482
1483 if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_BYTES, counters->bytes,
1484 SEG6_LOCAL_CNT_PAD))
1485 return -EMSGSIZE;
1486
1487 if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_ERRORS, counters->errors,
1488 SEG6_LOCAL_CNT_PAD))
1489 return -EMSGSIZE;
1490
1491 return 0;
1492}
1493
1494static int put_nla_counters(struct sk_buff *skb, struct seg6_local_lwt *slwt)
1495{
1496 struct seg6_local_counters counters = { 0, 0, 0 };
1497 struct nlattr *nest;
1498 int rc, i;
1499
1500 nest = nla_nest_start(skb, SEG6_LOCAL_COUNTERS);
1501 if (!nest)
1502 return -EMSGSIZE;
1503
1504 for_each_possible_cpu(i) {
1505 struct pcpu_seg6_local_counters *pcounters;
1506 u64 packets, bytes, errors;
1507 unsigned int start;
1508
1509 pcounters = per_cpu_ptr(slwt->pcpu_counters, i);
1510 do {
1511 start = u64_stats_fetch_begin_irq(&pcounters->syncp);
1512
1513 packets = u64_stats_read(&pcounters->packets);
1514 bytes = u64_stats_read(&pcounters->bytes);
1515 errors = u64_stats_read(&pcounters->errors);
1516
1517 } while (u64_stats_fetch_retry_irq(&pcounters->syncp, start));
1518
1519 counters.packets += packets;
1520 counters.bytes += bytes;
1521 counters.errors += errors;
1522 }
1523
1524 rc = seg6_local_fill_nla_counters(skb, &counters);
1525 if (rc < 0) {
1526 nla_nest_cancel(skb, nest);
1527 return rc;
1528 }
1529
1530 return nla_nest_end(skb, nest);
1531}
1532
1533static int cmp_nla_counters(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
1534{
1535 /* a and b are equal if both have pcpu_counters set or not */
1536 return (!!((unsigned long)a->pcpu_counters)) ^
1537 (!!((unsigned long)b->pcpu_counters));
1538}
1539
1540static void destroy_attr_counters(struct seg6_local_lwt *slwt)
1541{
1542 free_percpu(slwt->pcpu_counters);
1543}
1544
d1df6fd8
DL		 1545struct seg6_action_param {
1546 int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt);
1547 int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
1548 int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b);
964adce5
AM		 1549
1550 /* optional destroy() callback useful for releasing resources which
1551 * have been previously acquired in the corresponding parse()
1552 * function.
1553 */
1554 void (*destroy)(struct seg6_local_lwt *slwt);
d1df6fd8
DL		 1555};
1556
1557static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = {
2d9cc60a
DL		 1558 [SEG6_LOCAL_SRH] = { .parse = parse_nla_srh,
1559 .put = put_nla_srh,
964adce5
AM		 1560 .cmp = cmp_nla_srh,
1561 .destroy = destroy_attr_srh },
d1df6fd8 1562
2d9cc60a
DL		 1563 [SEG6_LOCAL_TABLE] = { .parse = parse_nla_table,
1564 .put = put_nla_table,
1565 .cmp = cmp_nla_table },
d1df6fd8 1566
2d9cc60a
DL		 1567 [SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4,
1568 .put = put_nla_nh4,
1569 .cmp = cmp_nla_nh4 },
d1df6fd8 1570
2d9cc60a
DL		 1571 [SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6,
1572 .put = put_nla_nh6,
1573 .cmp = cmp_nla_nh6 },
d1df6fd8 1574
2d9cc60a
DL		 1575 [SEG6_LOCAL_IIF] = { .parse = parse_nla_iif,
1576 .put = put_nla_iif,
1577 .cmp = cmp_nla_iif },
d1df6fd8 1578
2d9cc60a
DL		 1579 [SEG6_LOCAL_OIF] = { .parse = parse_nla_oif,
1580 .put = put_nla_oif,
1581 .cmp = cmp_nla_oif },
004d4b27
MX		 1582
1583 [SEG6_LOCAL_BPF] = { .parse = parse_nla_bpf,
1584 .put = put_nla_bpf,
964adce5
AM		 1585 .cmp = cmp_nla_bpf,
1586 .destroy = destroy_attr_bpf },
004d4b27 1587
664d6f86
AM		 1588 [SEG6_LOCAL_VRFTABLE] = { .parse = parse_nla_vrftable,
1589 .put = put_nla_vrftable,
1590 .cmp = cmp_nla_vrftable },
1591
94604548
AM		 1592 [SEG6_LOCAL_COUNTERS] = { .parse = parse_nla_counters,
1593 .put = put_nla_counters,
1594 .cmp = cmp_nla_counters,
1595 .destroy = destroy_attr_counters },
d1df6fd8
DL		 1596};
1597
964adce5 1598/* call the destroy() callback (if available) for each set attribute in
0a3021f1
AM		 1599 * @parsed_attrs, starting from the first attribute up to the @max_parsed
1600 * (excluded) attribute.
964adce5 1601 */
0a3021f1
AM		 1602static void __destroy_attrs(unsigned long parsed_attrs, int max_parsed,
1603 struct seg6_local_lwt *slwt)
964adce5 1604{
964adce5
AM		 1605 struct seg6_action_param *param;
1606 int i;
1607
1608 /* Every required seg6local attribute is identified by an ID which is
1609 * encoded as a flag (i.e: 1 << ID) in the 'attrs' bitmask;
1610 *
0a3021f1 1611 * We scan the 'parsed_attrs' bitmask, starting from the first attribute
964adce5
AM		 1612 * up to the @max_parsed (excluded) attribute.
1613 * For each set attribute, we retrieve the corresponding destroy()
1614 * callback. If the callback is not available, then we skip to the next
1615 * attribute; otherwise, we call the destroy() callback.
1616 */
1617 for (i = 0; i < max_parsed; ++i) {
300a0fd8 1618 if (!(parsed_attrs & SEG6_F_ATTR(i)))
964adce5
AM		 1619 continue;
1620
1621 param = &seg6_action_params[i];
1622
1623 if (param->destroy)
1624 param->destroy(slwt);
1625 }
1626}
1627
1628/* release all the resources that may have been acquired during parsing
1629 * operations.
1630 */
1631static void destroy_attrs(struct seg6_local_lwt *slwt)
1632{
0a3021f1
AM		 1633 unsigned long attrs = slwt->desc->attrs | slwt->parsed_optattrs;
1634
1635 __destroy_attrs(attrs, SEG6_LOCAL_MAX + 1, slwt);
1636}
1637
1638static int parse_nla_optional_attrs(struct nlattr **attrs,
1639 struct seg6_local_lwt *slwt)
1640{
1641 struct seg6_action_desc *desc = slwt->desc;
1642 unsigned long parsed_optattrs = 0;
1643 struct seg6_action_param *param;
1644 int err, i;
1645
1646 for (i = 0; i < SEG6_LOCAL_MAX + 1; ++i) {
300a0fd8 1647 if (!(desc->optattrs & SEG6_F_ATTR(i)) || !attrs[i])
0a3021f1
AM		 1648 continue;
1649
1650 /* once here, the i-th attribute is provided by the
1651 * userspace AND it is identified optional as well.
1652 */
1653 param = &seg6_action_params[i];
1654
1655 err = param->parse(attrs, slwt);
1656 if (err < 0)
1657 goto parse_optattrs_err;
1658
1659 /* current attribute has been correctly parsed */
300a0fd8 1660 parsed_optattrs |= SEG6_F_ATTR(i);
0a3021f1
AM		 1661 }
1662
1663 /* store in the tunnel state all the optional attributed successfully
1664 * parsed.
1665 */
1666 slwt->parsed_optattrs = parsed_optattrs;
1667
1668 return 0;
1669
1670parse_optattrs_err:
1671 __destroy_attrs(parsed_optattrs, i, slwt);
1672
1673 return err;
964adce5
AM		 1674}
1675
cfdf64a0
AM		 1676/* call the custom constructor of the behavior during its initialization phase
1677 * and after that all its attributes have been parsed successfully.
1678 */
1679static int
1680seg6_local_lwtunnel_build_state(struct seg6_local_lwt *slwt, const void *cfg,
1681 struct netlink_ext_ack *extack)
1682{
1683 struct seg6_action_desc *desc = slwt->desc;
1684 struct seg6_local_lwtunnel_ops *ops;
1685
1686 ops = &desc->slwt_ops;
1687 if (!ops->build_state)
1688 return 0;
1689
1690 return ops->build_state(slwt, cfg, extack);
1691}
1692
1693/* call the custom destructor of the behavior which is invoked before the
1694 * tunnel is going to be destroyed.
1695 */
1696static void seg6_local_lwtunnel_destroy_state(struct seg6_local_lwt *slwt)
1697{
1698 struct seg6_action_desc *desc = slwt->desc;
1699 struct seg6_local_lwtunnel_ops *ops;
1700
1701 ops = &desc->slwt_ops;
1702 if (!ops->destroy_state)
1703 return;
1704
1705 ops->destroy_state(slwt);
1706}
1707
d1df6fd8
DL		 1708static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt)
1709{
1710 struct seg6_action_param *param;
1711 struct seg6_action_desc *desc;
0a3021f1 1712 unsigned long invalid_attrs;
d1df6fd8
DL		 1713 int i, err;
1714
1715 desc = __get_action_desc(slwt->action);
1716 if (!desc)
1717 return -EINVAL;
1718
1719 if (!desc->input)
1720 return -EOPNOTSUPP;
1721
1722 slwt->desc = desc;
1723 slwt->headroom += desc->static_headroom;
1724
0a3021f1
AM		 1725 /* Forcing the desc->optattrs *set* and the desc->attrs *set* to be
1726 * disjoined, this allow us to release acquired resources by optional
1727 * attributes and by required attributes independently from each other
0d770360 1728 * without any interference.
0a3021f1
AM		 1729 * In other terms, we are sure that we do not release some the acquired
1730 * resources twice.
1731 *
1732 * Note that if an attribute is configured both as required and as
1733 * optional, it means that the user has messed something up in the
1734 * seg6_action_table. Therefore, this check is required for SRv6
1735 * behaviors to work properly.
1736 */
1737 invalid_attrs = desc->attrs & desc->optattrs;
1738 if (invalid_attrs) {
1739 WARN_ONCE(1,
1740 "An attribute cannot be both required AND optional");
1741 return -EINVAL;
1742 }
1743
1744 /* parse the required attributes */
d1df6fd8 1745 for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
300a0fd8 1746 if (desc->attrs & SEG6_F_ATTR(i)) {
d1df6fd8
DL		 1747 if (!attrs[i])
1748 return -EINVAL;
1749
1750 param = &seg6_action_params[i];
1751
1752 err = param->parse(attrs, slwt);
1753 if (err < 0)
0a3021f1 1754 goto parse_attrs_err;
d1df6fd8
DL		 1755 }
1756 }
1757
0a3021f1
AM		 1758 /* parse the optional attributes, if any */
1759 err = parse_nla_optional_attrs(attrs, slwt);
1760 if (err < 0)
1761 goto parse_attrs_err;
1762
d1df6fd8 1763 return 0;
964adce5 1764
0a3021f1 1765parse_attrs_err:
964adce5
AM		 1766 /* release any resource that may have been acquired during the i-1
1767 * parse() operations.
1768 */
0a3021f1 1769 __destroy_attrs(desc->attrs, i, slwt);
964adce5
AM		 1770
1771 return err;
d1df6fd8
DL		 1772}
1773
faee6769
AA		 1774static int seg6_local_build_state(struct net *net, struct nlattr *nla,
1775 unsigned int family, const void *cfg,
1776 struct lwtunnel_state **ts,
d1df6fd8
DL		 1777 struct netlink_ext_ack *extack)
1778{
1779 struct nlattr *tb[SEG6_LOCAL_MAX + 1];
1780 struct lwtunnel_state *newts;
1781 struct seg6_local_lwt *slwt;
1782 int err;
1783
6285217f
DL		 1784 if (family != AF_INET6)
1785 return -EINVAL;
1786
8cb08174
JB		 1787 err = nla_parse_nested_deprecated(tb, SEG6_LOCAL_MAX, nla,
1788 seg6_local_policy, extack);
d1df6fd8
DL		 1789
1790 if (err < 0)
1791 return err;
1792
1793 if (!tb[SEG6_LOCAL_ACTION])
1794 return -EINVAL;
1795
1796 newts = lwtunnel_state_alloc(sizeof(*slwt));
1797 if (!newts)
1798 return -ENOMEM;
1799
1800 slwt = seg6_local_lwtunnel(newts);
1801 slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]);
1802
1803 err = parse_nla_action(tb, slwt);
1804 if (err < 0)
1805 goto out_free;
1806
cfdf64a0
AM		 1807 err = seg6_local_lwtunnel_build_state(slwt, cfg, extack);
1808 if (err < 0)
1809 goto out_destroy_attrs;
1810
d1df6fd8
DL		 1811 newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL;
1812 newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT;
1813 newts->headroom = slwt->headroom;
1814
1815 *ts = newts;
1816
1817 return 0;
1818
cfdf64a0
AM		 1819out_destroy_attrs:
1820 destroy_attrs(slwt);
d1df6fd8 1821out_free:
d1df6fd8
DL		 1822 kfree(newts);
1823 return err;
1824}
1825
1826static void seg6_local_destroy_state(struct lwtunnel_state *lwt)
1827{
1828 struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
1829
cfdf64a0
AM		 1830 seg6_local_lwtunnel_destroy_state(slwt);
1831
964adce5 1832 destroy_attrs(slwt);
004d4b27
MX		 1833
1834 return;
d1df6fd8
DL		 1835}
1836
1837static int seg6_local_fill_encap(struct sk_buff *skb,
1838 struct lwtunnel_state *lwt)
1839{
1840 struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
1841 struct seg6_action_param *param;
0a3021f1 1842 unsigned long attrs;
d1df6fd8
DL		 1843 int i, err;
1844
1845 if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action))
1846 return -EMSGSIZE;
1847
0a3021f1
AM		 1848 attrs = slwt->desc->attrs | slwt->parsed_optattrs;
1849
d1df6fd8 1850 for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
300a0fd8 1851 if (attrs & SEG6_F_ATTR(i)) {
d1df6fd8
DL		 1852 param = &seg6_action_params[i];
1853 err = param->put(skb, slwt);
1854 if (err < 0)
1855 return err;
1856 }
1857 }
1858
1859 return 0;
1860}
1861
1862static int seg6_local_get_encap_size(struct lwtunnel_state *lwt)
1863{
1864 struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
1865 unsigned long attrs;
1866 int nlsize;
1867
1868 nlsize = nla_total_size(4); /* action */
1869
0a3021f1 1870 attrs = slwt->desc->attrs | slwt->parsed_optattrs;
d1df6fd8 1871
300a0fd8 1872 if (attrs & SEG6_F_ATTR(SEG6_LOCAL_SRH))
d1df6fd8
DL		 1873 nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3);
1874
300a0fd8 1875 if (attrs & SEG6_F_ATTR(SEG6_LOCAL_TABLE))
d1df6fd8
DL		 1876 nlsize += nla_total_size(4);
1877
300a0fd8 1878 if (attrs & SEG6_F_ATTR(SEG6_LOCAL_NH4))
d1df6fd8
DL		 1879 nlsize += nla_total_size(4);
1880
300a0fd8 1881 if (attrs & SEG6_F_ATTR(SEG6_LOCAL_NH6))
d1df6fd8
DL		 1882 nlsize += nla_total_size(16);
1883
300a0fd8 1884 if (attrs & SEG6_F_ATTR(SEG6_LOCAL_IIF))
d1df6fd8
DL		 1885 nlsize += nla_total_size(4);
1886
300a0fd8 1887 if (attrs & SEG6_F_ATTR(SEG6_LOCAL_OIF))
d1df6fd8
DL		 1888 nlsize += nla_total_size(4);
1889
300a0fd8 1890 if (attrs & SEG6_F_ATTR(SEG6_LOCAL_BPF))
004d4b27
MX		 1891 nlsize += nla_total_size(sizeof(struct nlattr)) +
1892 nla_total_size(MAX_PROG_NAME) +
1893 nla_total_size(4);
1894
300a0fd8 1895 if (attrs & SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE))
664d6f86
AM		 1896 nlsize += nla_total_size(4);
1897
94604548
AM		 1898 if (attrs & SEG6_F_LOCAL_COUNTERS)
1899 nlsize += nla_total_size(0) + /* nest SEG6_LOCAL_COUNTERS */
1900 /* SEG6_LOCAL_CNT_PACKETS */
1901 nla_total_size_64bit(sizeof(__u64)) +
1902 /* SEG6_LOCAL_CNT_BYTES */
1903 nla_total_size_64bit(sizeof(__u64)) +
1904 /* SEG6_LOCAL_CNT_ERRORS */
1905 nla_total_size_64bit(sizeof(__u64));
1906
d1df6fd8
DL		 1907 return nlsize;
1908}
1909
1910static int seg6_local_cmp_encap(struct lwtunnel_state *a,
1911 struct lwtunnel_state *b)
1912{
1913 struct seg6_local_lwt *slwt_a, *slwt_b;
1914 struct seg6_action_param *param;
0a3021f1 1915 unsigned long attrs_a, attrs_b;
d1df6fd8
DL		 1916 int i;
1917
1918 slwt_a = seg6_local_lwtunnel(a);
1919 slwt_b = seg6_local_lwtunnel(b);
1920
1921 if (slwt_a->action != slwt_b->action)
1922 return 1;
1923
0a3021f1
AM		 1924 attrs_a = slwt_a->desc->attrs | slwt_a->parsed_optattrs;
1925 attrs_b = slwt_b->desc->attrs | slwt_b->parsed_optattrs;
1926
1927 if (attrs_a != attrs_b)
d1df6fd8
DL		 1928 return 1;
1929
1930 for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
300a0fd8 1931 if (attrs_a & SEG6_F_ATTR(i)) {
d1df6fd8
DL		 1932 param = &seg6_action_params[i];
1933 if (param->cmp(slwt_a, slwt_b))
1934 return 1;
1935 }
1936 }
1937
1938 return 0;
1939}
1940
1941static const struct lwtunnel_encap_ops seg6_local_ops = {
1942 .build_state = seg6_local_build_state,
1943 .destroy_state = seg6_local_destroy_state,
1944 .input = seg6_local_input,
1945 .fill_encap = seg6_local_fill_encap,
1946 .get_encap_size = seg6_local_get_encap_size,
1947 .cmp_encap = seg6_local_cmp_encap,
1948 .owner = THIS_MODULE,
1949};
1950
1951int __init seg6_local_init(void)
1952{
300a0fd8
AM		 1953 /* If the max total number of defined attributes is reached, then your
1954 * kernel build stops here.
1955 *
1956 * This check is required to avoid arithmetic overflows when processing
1957 * behavior attributes and the maximum number of defined attributes
1958 * exceeds the allowed value.
1959 */
1960 BUILD_BUG_ON(SEG6_LOCAL_MAX + 1 > BITS_PER_TYPE(unsigned long));
1961
d1df6fd8
DL		 1962 return lwtunnel_encap_add_ops(&seg6_local_ops,
1963 LWTUNNEL_ENCAP_SEG6_LOCAL);
1964}
1965
1966void seg6_local_exit(void)
1967{
1968 lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL);
1969}
Linux 6.x block layer and io_uring tree(s)