1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2013 Nicira, Inc.
4 */
5
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/skbuff.h>
11 #include <linux/netdevice.h>
12 #include <linux/in.h>
13 #include <linux/if_arp.h>
14 #include <linux/init.h>
15 #include <linux/in6.h>
16 #include <linux/inetdevice.h>
17 #include <linux/netfilter_ipv4.h>
18 #include <linux/etherdevice.h>
19 #include <linux/if_ether.h>
20 #include <linux/if_vlan.h>
21 #include <linux/static_key.h>
22
23 #include <net/ip.h>
24 #include <net/icmp.h>
25 #include <net/protocol.h>
26 #include <net/ip_tunnels.h>
27 #include <net/ip6_tunnel.h>
28 #include <net/ip6_checksum.h>
29 #include <net/arp.h>
30 #include <net/checksum.h>
31 #include <net/dsfield.h>
32 #include <net/inet_ecn.h>
33 #include <net/xfrm.h>
34 #include <net/net_namespace.h>
35 #include <net/netns/generic.h>
36 #include <net/rtnetlink.h>
37 #include <net/dst_metadata.h>
38 #include <net/geneve.h>
39 #include <net/vxlan.h>
40 #include <net/erspan.h>
41
42 const struct ip_tunnel_encap_ops __rcu *
43 iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
44 EXPORT_SYMBOL(iptun_encaps);
45
46 const struct ip6_tnl_encap_ops __rcu *
47 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
48 EXPORT_SYMBOL(ip6tun_encaps);
49
iptunnel_xmit(struct sock * sk,struct rtable * rt,struct sk_buff * skb,__be32 src,__be32 dst,__u8 proto,__u8 tos,__u8 ttl,__be16 df,bool xnet,u16 ipcb_flags)50 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
51 __be32 src, __be32 dst, __u8 proto,
52 __u8 tos, __u8 ttl, __be16 df, bool xnet,
53 u16 ipcb_flags)
54 {
55 int pkt_len = skb->len - skb_inner_network_offset(skb);
56 struct net *net = dev_net(rt->dst.dev);
57 struct net_device *dev = skb->dev;
58 struct iphdr *iph;
59 int err;
60
61 if (unlikely(dev_recursion_level() > IP_TUNNEL_RECURSION_LIMIT)) {
62 if (dev) {
63 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
64 dev->name);
65 DEV_STATS_INC(dev, tx_errors);
66 }
67 ip_rt_put(rt);
68 kfree_skb(skb);
69 return;
70 }
71
72 dev_xmit_recursion_inc();
73
74 skb_scrub_packet(skb, xnet);
75
76 skb_clear_hash_if_not_l4(skb);
77 skb_dst_set(skb, &rt->dst);
78 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
79 IPCB(skb)->flags = ipcb_flags;
80
81 /* Push down and install the IP header. */
82 skb_push(skb, sizeof(struct iphdr));
83 skb_reset_network_header(skb);
84
85 iph = ip_hdr(skb);
86
87 iph->version = 4;
88 iph->ihl = sizeof(struct iphdr) >> 2;
89 iph->frag_off = ip_mtu_locked(&rt->dst) ? 0 : df;
90 iph->protocol = proto;
91 iph->tos = tos;
92 iph->daddr = dst;
93 iph->saddr = src;
94 iph->ttl = ttl;
95 __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
96
97 err = ip_local_out(net, sk, skb);
98
99 if (dev) {
100 if (unlikely(net_xmit_eval(err)))
101 pkt_len = 0;
102 iptunnel_xmit_stats(dev, pkt_len);
103 }
104
105 dev_xmit_recursion_dec();
106 }
107 EXPORT_SYMBOL_GPL(iptunnel_xmit);
108
__iptunnel_pull_header(struct sk_buff * skb,int hdr_len,__be16 inner_proto,bool raw_proto,bool xnet)109 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
110 __be16 inner_proto, bool raw_proto, bool xnet)
111 {
112 if (unlikely(!pskb_may_pull(skb, hdr_len)))
113 return -ENOMEM;
114
115 skb_pull_rcsum(skb, hdr_len);
116
117 if (!raw_proto && inner_proto == htons(ETH_P_TEB)) {
118 struct ethhdr *eh;
119
120 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
121 return -ENOMEM;
122
123 eh = (struct ethhdr *)skb->data;
124 if (likely(eth_proto_is_802_3(eh->h_proto)))
125 skb->protocol = eh->h_proto;
126 else
127 skb->protocol = htons(ETH_P_802_2);
128
129 } else {
130 skb->protocol = inner_proto;
131 }
132
133 skb_clear_hash_if_not_l4(skb);
134 __vlan_hwaccel_clear_tag(skb);
135 skb_set_queue_mapping(skb, 0);
136 skb_scrub_packet(skb, xnet);
137
138 return iptunnel_pull_offloads(skb);
139 }
140 EXPORT_SYMBOL_GPL(__iptunnel_pull_header);
141
iptunnel_metadata_reply(struct metadata_dst * md,gfp_t flags)142 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
143 gfp_t flags)
144 {
145 IP_TUNNEL_DECLARE_FLAGS(tun_flags) = { };
146 struct metadata_dst *res;
147 struct ip_tunnel_info *dst, *src;
148
149 if (!md || md->type != METADATA_IP_TUNNEL ||
150 md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
151 return NULL;
152
153 src = &md->u.tun_info;
154 res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags);
155 if (!res)
156 return NULL;
157
158 dst = &res->u.tun_info;
159 dst->key.tun_id = src->key.tun_id;
160 if (src->mode & IP_TUNNEL_INFO_IPV6)
161 memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
162 sizeof(struct in6_addr));
163 else
164 dst->key.u.ipv4.dst = src->key.u.ipv4.src;
165 ip_tunnel_flags_copy(dst->key.tun_flags, src->key.tun_flags);
166 dst->mode = src->mode | IP_TUNNEL_INFO_TX;
167 ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src),
168 src->options_len, tun_flags);
169
170 return res;
171 }
172 EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
173
iptunnel_handle_offloads(struct sk_buff * skb,int gso_type_mask)174 int iptunnel_handle_offloads(struct sk_buff *skb,
175 int gso_type_mask)
176 {
177 int err;
178
179 if (likely(!skb->encapsulation)) {
180 skb_reset_inner_headers(skb);
181 skb->encapsulation = 1;
182 }
183
184 if (skb_is_gso(skb)) {
185 err = skb_header_unclone(skb, GFP_ATOMIC);
186 if (unlikely(err))
187 return err;
188 skb_shinfo(skb)->gso_type |= gso_type_mask;
189 return 0;
190 }
191
192 if (skb->ip_summed != CHECKSUM_PARTIAL) {
193 skb->ip_summed = CHECKSUM_NONE;
194 /* We clear encapsulation here to prevent badly-written
195 * drivers potentially deciding to offload an inner checksum
196 * if we set CHECKSUM_PARTIAL on the outer header.
197 * This should go away when the drivers are all fixed.
198 */
199 skb->encapsulation = 0;
200 }
201
202 return 0;
203 }
204 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
205
206 /**
207 * iptunnel_pmtud_build_icmp() - Build ICMP error message for PMTUD
208 * @skb: Original packet with L2 header
209 * @mtu: MTU value for ICMP error
210 *
211 * Return: length on success, negative error code if message couldn't be built.
212 */
iptunnel_pmtud_build_icmp(struct sk_buff * skb,int mtu)213 static int iptunnel_pmtud_build_icmp(struct sk_buff *skb, int mtu)
214 {
215 const struct iphdr *iph = ip_hdr(skb);
216 struct icmphdr *icmph;
217 struct iphdr *niph;
218 struct ethhdr eh;
219 int len, err;
220
221 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
222 return -EINVAL;
223
224 if (skb_is_gso(skb))
225 skb_gso_reset(skb);
226
227 skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
228 pskb_pull(skb, ETH_HLEN);
229 skb_reset_network_header(skb);
230
231 err = pskb_trim(skb, 576 - sizeof(*niph) - sizeof(*icmph));
232 if (err)
233 return err;
234
235 len = skb->len + sizeof(*icmph);
236 err = skb_cow(skb, sizeof(*niph) + sizeof(*icmph) + ETH_HLEN);
237 if (err)
238 return err;
239
240 icmph = skb_push(skb, sizeof(*icmph));
241 *icmph = (struct icmphdr) {
242 .type = ICMP_DEST_UNREACH,
243 .code = ICMP_FRAG_NEEDED,
244 .checksum = 0,
245 .un.frag.__unused = 0,
246 .un.frag.mtu = htons(mtu),
247 };
248 icmph->checksum = csum_fold(skb_checksum(skb, 0, len, 0));
249 skb_reset_transport_header(skb);
250
251 niph = skb_push(skb, sizeof(*niph));
252 *niph = (struct iphdr) {
253 .ihl = sizeof(*niph) / 4u,
254 .version = 4,
255 .tos = 0,
256 .tot_len = htons(len + sizeof(*niph)),
257 .id = 0,
258 .frag_off = htons(IP_DF),
259 .ttl = iph->ttl,
260 .protocol = IPPROTO_ICMP,
261 .saddr = iph->daddr,
262 .daddr = iph->saddr,
263 };
264 ip_send_check(niph);
265 skb_reset_network_header(skb);
266
267 skb->ip_summed = CHECKSUM_NONE;
268
269 eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
270 skb_reset_mac_header(skb);
271
272 return skb->len;
273 }
274
275 /**
276 * iptunnel_pmtud_check_icmp() - Trigger ICMP reply if needed and allowed
277 * @skb: Buffer being sent by encapsulation, L2 headers expected
278 * @mtu: Network MTU for path
279 *
280 * Return: 0 for no ICMP reply, length if built, negative value on error.
281 */
iptunnel_pmtud_check_icmp(struct sk_buff * skb,int mtu)282 static int iptunnel_pmtud_check_icmp(struct sk_buff *skb, int mtu)
283 {
284 const struct icmphdr *icmph = icmp_hdr(skb);
285 const struct iphdr *iph = ip_hdr(skb);
286
287 if (mtu < 576 || iph->frag_off != htons(IP_DF))
288 return 0;
289
290 if (ipv4_is_lbcast(iph->daddr) || ipv4_is_multicast(iph->daddr) ||
291 ipv4_is_zeronet(iph->saddr) || ipv4_is_loopback(iph->saddr) ||
292 ipv4_is_lbcast(iph->saddr) || ipv4_is_multicast(iph->saddr))
293 return 0;
294
295 if (iph->protocol == IPPROTO_ICMP && icmp_is_err(icmph->type))
296 return 0;
297
298 return iptunnel_pmtud_build_icmp(skb, mtu);
299 }
300
301 #if IS_ENABLED(CONFIG_IPV6)
302 /**
303 * iptunnel_pmtud_build_icmpv6() - Build ICMPv6 error message for PMTUD
304 * @skb: Original packet with L2 header
305 * @mtu: MTU value for ICMPv6 error
306 *
307 * Return: length on success, negative error code if message couldn't be built.
308 */
iptunnel_pmtud_build_icmpv6(struct sk_buff * skb,int mtu)309 static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb, int mtu)
310 {
311 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
312 struct icmp6hdr *icmp6h;
313 struct ipv6hdr *nip6h;
314 struct ethhdr eh;
315 int len, err;
316 __wsum csum;
317
318 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
319 return -EINVAL;
320
321 if (skb_is_gso(skb))
322 skb_gso_reset(skb);
323
324 skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
325 pskb_pull(skb, ETH_HLEN);
326 skb_reset_network_header(skb);
327
328 err = pskb_trim(skb, IPV6_MIN_MTU - sizeof(*nip6h) - sizeof(*icmp6h));
329 if (err)
330 return err;
331
332 len = skb->len + sizeof(*icmp6h);
333 err = skb_cow(skb, sizeof(*nip6h) + sizeof(*icmp6h) + ETH_HLEN);
334 if (err)
335 return err;
336
337 icmp6h = skb_push(skb, sizeof(*icmp6h));
338 *icmp6h = (struct icmp6hdr) {
339 .icmp6_type = ICMPV6_PKT_TOOBIG,
340 .icmp6_code = 0,
341 .icmp6_cksum = 0,
342 .icmp6_mtu = htonl(mtu),
343 };
344 skb_reset_transport_header(skb);
345
346 nip6h = skb_push(skb, sizeof(*nip6h));
347 *nip6h = (struct ipv6hdr) {
348 .priority = 0,
349 .version = 6,
350 .flow_lbl = { 0 },
351 .payload_len = htons(len),
352 .nexthdr = IPPROTO_ICMPV6,
353 .hop_limit = ip6h->hop_limit,
354 .saddr = ip6h->daddr,
355 .daddr = ip6h->saddr,
356 };
357 skb_reset_network_header(skb);
358
359 csum = skb_checksum(skb, skb_transport_offset(skb), len, 0);
360 icmp6h->icmp6_cksum = csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr, len,
361 IPPROTO_ICMPV6, csum);
362
363 skb->ip_summed = CHECKSUM_NONE;
364
365 eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
366 skb_reset_mac_header(skb);
367
368 return skb->len;
369 }
370
371 /**
372 * iptunnel_pmtud_check_icmpv6() - Trigger ICMPv6 reply if needed and allowed
373 * @skb: Buffer being sent by encapsulation, L2 headers expected
374 * @mtu: Network MTU for path
375 *
376 * Return: 0 for no ICMPv6 reply, length if built, negative value on error.
377 */
iptunnel_pmtud_check_icmpv6(struct sk_buff * skb,int mtu)378 static int iptunnel_pmtud_check_icmpv6(struct sk_buff *skb, int mtu)
379 {
380 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
381 int stype = ipv6_addr_type(&ip6h->saddr);
382 u8 proto = ip6h->nexthdr;
383 __be16 frag_off;
384 int offset;
385
386 if (mtu < IPV6_MIN_MTU)
387 return 0;
388
389 if (stype == IPV6_ADDR_ANY || stype == IPV6_ADDR_MULTICAST ||
390 stype == IPV6_ADDR_LOOPBACK)
391 return 0;
392
393 offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto,
394 &frag_off);
395 if (offset < 0 || (frag_off & htons(~0x7)))
396 return 0;
397
398 if (proto == IPPROTO_ICMPV6) {
399 struct icmp6hdr *icmp6h;
400
401 if (!pskb_may_pull(skb, skb_network_header(skb) +
402 offset + 1 - skb->data))
403 return 0;
404
405 icmp6h = (struct icmp6hdr *)(skb_network_header(skb) + offset);
406 if (icmpv6_is_err(icmp6h->icmp6_type) ||
407 icmp6h->icmp6_type == NDISC_REDIRECT)
408 return 0;
409 }
410
411 return iptunnel_pmtud_build_icmpv6(skb, mtu);
412 }
413 #endif /* IS_ENABLED(CONFIG_IPV6) */
414
415 /**
416 * skb_tunnel_check_pmtu() - Check, update PMTU and trigger ICMP reply as needed
417 * @skb: Buffer being sent by encapsulation, L2 headers expected
418 * @encap_dst: Destination for tunnel encapsulation (outer IP)
419 * @headroom: Encapsulation header size, bytes
420 * @reply: Build matching ICMP or ICMPv6 message as a result
421 *
422 * L2 tunnel implementations that can carry IP and can be directly bridged
423 * (currently UDP tunnels) can't always rely on IP forwarding paths to handle
424 * PMTU discovery. In the bridged case, ICMP or ICMPv6 messages need to be built
425 * based on payload and sent back by the encapsulation itself.
426 *
427 * For routable interfaces, we just need to update the PMTU for the destination.
428 *
429 * Return: 0 if ICMP error not needed, length if built, negative value on error
430 */
skb_tunnel_check_pmtu(struct sk_buff * skb,struct dst_entry * encap_dst,int headroom,bool reply)431 int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
432 int headroom, bool reply)
433 {
434 u32 mtu = dst_mtu(encap_dst) - headroom;
435
436 if ((skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) ||
437 (!skb_is_gso(skb) && (skb->len - skb_network_offset(skb)) <= mtu))
438 return 0;
439
440 skb_dst_update_pmtu_no_confirm(skb, mtu);
441
442 if (!reply)
443 return 0;
444
445 if (skb->protocol == htons(ETH_P_IP))
446 return iptunnel_pmtud_check_icmp(skb, mtu);
447
448 #if IS_ENABLED(CONFIG_IPV6)
449 if (skb->protocol == htons(ETH_P_IPV6))
450 return iptunnel_pmtud_check_icmpv6(skb, mtu);
451 #endif
452 return 0;
453 }
454 EXPORT_SYMBOL(skb_tunnel_check_pmtu);
455
456 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
457 [LWTUNNEL_IP_UNSPEC] = { .strict_start_type = LWTUNNEL_IP_OPTS },
458 [LWTUNNEL_IP_ID] = { .type = NLA_U64 },
459 [LWTUNNEL_IP_DST] = { .type = NLA_U32 },
460 [LWTUNNEL_IP_SRC] = { .type = NLA_U32 },
461 [LWTUNNEL_IP_TTL] = { .type = NLA_U8 },
462 [LWTUNNEL_IP_TOS] = { .type = NLA_U8 },
463 [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
464 [LWTUNNEL_IP_OPTS] = { .type = NLA_NESTED },
465 };
466
467 static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = {
468 [LWTUNNEL_IP_OPTS_GENEVE] = { .type = NLA_NESTED },
469 [LWTUNNEL_IP_OPTS_VXLAN] = { .type = NLA_NESTED },
470 [LWTUNNEL_IP_OPTS_ERSPAN] = { .type = NLA_NESTED },
471 };
472
473 static const struct nla_policy
474 geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = {
475 [LWTUNNEL_IP_OPT_GENEVE_CLASS] = { .type = NLA_U16 },
476 [LWTUNNEL_IP_OPT_GENEVE_TYPE] = { .type = NLA_U8 },
477 [LWTUNNEL_IP_OPT_GENEVE_DATA] = { .type = NLA_BINARY, .len = 127 },
478 };
479
480 static const struct nla_policy
481 vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = {
482 [LWTUNNEL_IP_OPT_VXLAN_GBP] = { .type = NLA_U32 },
483 };
484
485 static const struct nla_policy
486 erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = {
487 [LWTUNNEL_IP_OPT_ERSPAN_VER] = { .type = NLA_U8 },
488 [LWTUNNEL_IP_OPT_ERSPAN_INDEX] = { .type = NLA_U32 },
489 [LWTUNNEL_IP_OPT_ERSPAN_DIR] = { .type = NLA_U8 },
490 [LWTUNNEL_IP_OPT_ERSPAN_HWID] = { .type = NLA_U8 },
491 };
492
ip_tun_parse_opts_geneve(struct nlattr * attr,struct ip_tunnel_info * info,int opts_len,struct netlink_ext_ack * extack)493 static int ip_tun_parse_opts_geneve(struct nlattr *attr,
494 struct ip_tunnel_info *info, int opts_len,
495 struct netlink_ext_ack *extack)
496 {
497 struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1];
498 int data_len, err;
499
500 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr,
501 geneve_opt_policy, extack);
502 if (err)
503 return err;
504
505 if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] ||
506 !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] ||
507 !tb[LWTUNNEL_IP_OPT_GENEVE_DATA])
508 return -EINVAL;
509
510 attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];
511 data_len = nla_len(attr);
512 if (data_len % 4)
513 return -EINVAL;
514
515 if (info) {
516 struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;
517
518 memcpy(opt->opt_data, nla_data(attr), data_len);
519 opt->length = data_len / 4;
520 attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS];
521 opt->opt_class = nla_get_be16(attr);
522 attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE];
523 opt->type = nla_get_u8(attr);
524 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags);
525 }
526
527 return sizeof(struct geneve_opt) + data_len;
528 }
529
ip_tun_parse_opts_vxlan(struct nlattr * attr,struct ip_tunnel_info * info,int opts_len,struct netlink_ext_ack * extack)530 static int ip_tun_parse_opts_vxlan(struct nlattr *attr,
531 struct ip_tunnel_info *info, int opts_len,
532 struct netlink_ext_ack *extack)
533 {
534 struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1];
535 int err;
536
537 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr,
538 vxlan_opt_policy, extack);
539 if (err)
540 return err;
541
542 if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP])
543 return -EINVAL;
544
545 if (info) {
546 struct vxlan_metadata *md =
547 ip_tunnel_info_opts(info) + opts_len;
548
549 attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP];
550 md->gbp = nla_get_u32(attr);
551 md->gbp &= VXLAN_GBP_MASK;
552 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags);
553 }
554
555 return sizeof(struct vxlan_metadata);
556 }
557
ip_tun_parse_opts_erspan(struct nlattr * attr,struct ip_tunnel_info * info,int opts_len,struct netlink_ext_ack * extack)558 static int ip_tun_parse_opts_erspan(struct nlattr *attr,
559 struct ip_tunnel_info *info, int opts_len,
560 struct netlink_ext_ack *extack)
561 {
562 struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1];
563 int err;
564 u8 ver;
565
566 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr,
567 erspan_opt_policy, extack);
568 if (err)
569 return err;
570
571 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER])
572 return -EINVAL;
573
574 ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]);
575 if (ver == 1) {
576 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX])
577 return -EINVAL;
578 } else if (ver == 2) {
579 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] ||
580 !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID])
581 return -EINVAL;
582 } else {
583 return -EINVAL;
584 }
585
586 if (info) {
587 struct erspan_metadata *md =
588 ip_tunnel_info_opts(info) + opts_len;
589
590 md->version = ver;
591 if (ver == 1) {
592 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX];
593 md->u.index = nla_get_be32(attr);
594 } else {
595 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR];
596 md->u.md2.dir = nla_get_u8(attr);
597 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID];
598 set_hwid(&md->u.md2, nla_get_u8(attr));
599 }
600
601 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, info->key.tun_flags);
602 }
603
604 return sizeof(struct erspan_metadata);
605 }
606
ip_tun_parse_opts(struct nlattr * attr,struct ip_tunnel_info * info,struct netlink_ext_ack * extack)607 static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info,
608 struct netlink_ext_ack *extack)
609 {
610 int err, rem, opt_len, opts_len = 0;
611 struct nlattr *nla;
612 u32 type = 0;
613
614 if (!attr)
615 return 0;
616
617 err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX,
618 ip_opts_policy, extack);
619 if (err)
620 return err;
621
622 nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
623 switch (nla_type(nla)) {
624 case LWTUNNEL_IP_OPTS_GENEVE:
625 if (type && type != IP_TUNNEL_GENEVE_OPT_BIT)
626 return -EINVAL;
627 opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len,
628 extack);
629 if (opt_len < 0)
630 return opt_len;
631 opts_len += opt_len;
632 if (opts_len > IP_TUNNEL_OPTS_MAX)
633 return -EINVAL;
634 type = IP_TUNNEL_GENEVE_OPT_BIT;
635 break;
636 case LWTUNNEL_IP_OPTS_VXLAN:
637 if (type)
638 return -EINVAL;
639 opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len,
640 extack);
641 if (opt_len < 0)
642 return opt_len;
643 opts_len += opt_len;
644 type = IP_TUNNEL_VXLAN_OPT_BIT;
645 break;
646 case LWTUNNEL_IP_OPTS_ERSPAN:
647 if (type)
648 return -EINVAL;
649 opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len,
650 extack);
651 if (opt_len < 0)
652 return opt_len;
653 opts_len += opt_len;
654 type = IP_TUNNEL_ERSPAN_OPT_BIT;
655 break;
656 default:
657 return -EINVAL;
658 }
659 }
660
661 return opts_len;
662 }
663
ip_tun_get_optlen(struct nlattr * attr,struct netlink_ext_ack * extack)664 static int ip_tun_get_optlen(struct nlattr *attr,
665 struct netlink_ext_ack *extack)
666 {
667 return ip_tun_parse_opts(attr, NULL, extack);
668 }
669
ip_tun_set_opts(struct nlattr * attr,struct ip_tunnel_info * info,struct netlink_ext_ack * extack)670 static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info,
671 struct netlink_ext_ack *extack)
672 {
673 return ip_tun_parse_opts(attr, info, extack);
674 }
675
ip_tun_build_state(struct net * net,struct nlattr * attr,unsigned int family,const void * cfg,struct lwtunnel_state ** ts,struct netlink_ext_ack * extack)676 static int ip_tun_build_state(struct net *net, struct nlattr *attr,
677 unsigned int family, const void *cfg,
678 struct lwtunnel_state **ts,
679 struct netlink_ext_ack *extack)
680 {
681 struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
682 struct lwtunnel_state *new_state;
683 struct ip_tunnel_info *tun_info;
684 int err, opt_len;
685
686 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr,
687 ip_tun_policy, extack);
688 if (err < 0)
689 return err;
690
691 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack);
692 if (opt_len < 0)
693 return opt_len;
694
695 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
696 if (!new_state)
697 return -ENOMEM;
698
699 new_state->type = LWTUNNEL_ENCAP_IP;
700
701 tun_info = lwt_tun_info(new_state);
702
703 err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack);
704 if (err < 0) {
705 lwtstate_free(new_state);
706 return err;
707 }
708
709 #ifdef CONFIG_DST_CACHE
710 err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL);
711 if (err) {
712 lwtstate_free(new_state);
713 return err;
714 }
715 #endif
716
717 if (tb[LWTUNNEL_IP_ID])
718 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
719
720 if (tb[LWTUNNEL_IP_DST])
721 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
722
723 if (tb[LWTUNNEL_IP_SRC])
724 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
725
726 if (tb[LWTUNNEL_IP_TTL])
727 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
728
729 if (tb[LWTUNNEL_IP_TOS])
730 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
731
732 if (tb[LWTUNNEL_IP_FLAGS]) {
733 IP_TUNNEL_DECLARE_FLAGS(flags);
734
735 ip_tunnel_flags_from_be16(flags,
736 nla_get_be16(tb[LWTUNNEL_IP_FLAGS]));
737 ip_tunnel_clear_options_present(flags);
738
739 ip_tunnel_flags_or(tun_info->key.tun_flags,
740 tun_info->key.tun_flags, flags);
741 }
742
743 tun_info->mode = IP_TUNNEL_INFO_TX;
744 tun_info->options_len = opt_len;
745
746 *ts = new_state;
747
748 return 0;
749 }
750
ip_tun_destroy_state(struct lwtunnel_state * lwtstate)751 static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate)
752 {
753 #ifdef CONFIG_DST_CACHE
754 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
755
756 dst_cache_destroy(&tun_info->dst_cache);
757 #endif
758 }
759
ip_tun_fill_encap_opts_geneve(struct sk_buff * skb,struct ip_tunnel_info * tun_info)760 static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb,
761 struct ip_tunnel_info *tun_info)
762 {
763 struct geneve_opt *opt;
764 struct nlattr *nest;
765 int offset = 0;
766
767 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE);
768 if (!nest)
769 return -ENOMEM;
770
771 while (tun_info->options_len > offset) {
772 opt = ip_tunnel_info_opts(tun_info) + offset;
773 if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS,
774 opt->opt_class) ||
775 nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) ||
776 nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4,
777 opt->opt_data)) {
778 nla_nest_cancel(skb, nest);
779 return -ENOMEM;
780 }
781 offset += sizeof(*opt) + opt->length * 4;
782 }
783
784 nla_nest_end(skb, nest);
785 return 0;
786 }
787
ip_tun_fill_encap_opts_vxlan(struct sk_buff * skb,struct ip_tunnel_info * tun_info)788 static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb,
789 struct ip_tunnel_info *tun_info)
790 {
791 struct vxlan_metadata *md;
792 struct nlattr *nest;
793
794 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN);
795 if (!nest)
796 return -ENOMEM;
797
798 md = ip_tunnel_info_opts(tun_info);
799 if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) {
800 nla_nest_cancel(skb, nest);
801 return -ENOMEM;
802 }
803
804 nla_nest_end(skb, nest);
805 return 0;
806 }
807
ip_tun_fill_encap_opts_erspan(struct sk_buff * skb,struct ip_tunnel_info * tun_info)808 static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb,
809 struct ip_tunnel_info *tun_info)
810 {
811 struct erspan_metadata *md;
812 struct nlattr *nest;
813
814 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN);
815 if (!nest)
816 return -ENOMEM;
817
818 md = ip_tunnel_info_opts(tun_info);
819 if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version))
820 goto err;
821
822 if (md->version == 1 &&
823 nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index))
824 goto err;
825
826 if (md->version == 2 &&
827 (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) ||
828 nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID,
829 get_hwid(&md->u.md2))))
830 goto err;
831
832 nla_nest_end(skb, nest);
833 return 0;
834 err:
835 nla_nest_cancel(skb, nest);
836 return -ENOMEM;
837 }
838
ip_tun_fill_encap_opts(struct sk_buff * skb,int type,struct ip_tunnel_info * tun_info)839 static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type,
840 struct ip_tunnel_info *tun_info)
841 {
842 struct nlattr *nest;
843 int err = 0;
844
845 if (!ip_tunnel_is_options_present(tun_info->key.tun_flags))
846 return 0;
847
848 nest = nla_nest_start_noflag(skb, type);
849 if (!nest)
850 return -ENOMEM;
851
852 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, tun_info->key.tun_flags))
853 err = ip_tun_fill_encap_opts_geneve(skb, tun_info);
854 else if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, tun_info->key.tun_flags))
855 err = ip_tun_fill_encap_opts_vxlan(skb, tun_info);
856 else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, tun_info->key.tun_flags))
857 err = ip_tun_fill_encap_opts_erspan(skb, tun_info);
858
859 if (err) {
860 nla_nest_cancel(skb, nest);
861 return err;
862 }
863
864 nla_nest_end(skb, nest);
865 return 0;
866 }
867
ip_tun_fill_encap_info(struct sk_buff * skb,struct lwtunnel_state * lwtstate)868 static int ip_tun_fill_encap_info(struct sk_buff *skb,
869 struct lwtunnel_state *lwtstate)
870 {
871 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
872
873 if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
874 LWTUNNEL_IP_PAD) ||
875 nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
876 nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
877 nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
878 nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
879 nla_put_be16(skb, LWTUNNEL_IP_FLAGS,
880 ip_tunnel_flags_to_be16(tun_info->key.tun_flags)) ||
881 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info))
882 return -ENOMEM;
883
884 return 0;
885 }
886
ip_tun_opts_nlsize(struct ip_tunnel_info * info)887 static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
888 {
889 int opt_len;
890
891 if (!ip_tunnel_is_options_present(info->key.tun_flags))
892 return 0;
893
894 opt_len = nla_total_size(0); /* LWTUNNEL_IP_OPTS */
895 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags)) {
896 struct geneve_opt *opt;
897 int offset = 0;
898
899 opt_len += nla_total_size(0); /* LWTUNNEL_IP_OPTS_GENEVE */
900 while (info->options_len > offset) {
901 opt = ip_tunnel_info_opts(info) + offset;
902 opt_len += nla_total_size(2) /* OPT_GENEVE_CLASS */
903 + nla_total_size(1) /* OPT_GENEVE_TYPE */
904 + nla_total_size(opt->length * 4);
905 /* OPT_GENEVE_DATA */
906 offset += sizeof(*opt) + opt->length * 4;
907 }
908 } else if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) {
909 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_VXLAN */
910 + nla_total_size(4); /* OPT_VXLAN_GBP */
911 } else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, info->key.tun_flags)) {
912 struct erspan_metadata *md = ip_tunnel_info_opts(info);
913
914 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_ERSPAN */
915 + nla_total_size(1) /* OPT_ERSPAN_VER */
916 + (md->version == 1 ? nla_total_size(4)
917 /* OPT_ERSPAN_INDEX (v1) */
918 : nla_total_size(1) +
919 nla_total_size(1));
920 /* OPT_ERSPAN_DIR + HWID (v2) */
921 }
922
923 return opt_len;
924 }
925
ip_tun_encap_nlsize(struct lwtunnel_state * lwtstate)926 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
927 {
928 return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */
929 + nla_total_size(4) /* LWTUNNEL_IP_DST */
930 + nla_total_size(4) /* LWTUNNEL_IP_SRC */
931 + nla_total_size(1) /* LWTUNNEL_IP_TOS */
932 + nla_total_size(1) /* LWTUNNEL_IP_TTL */
933 + nla_total_size(2) /* LWTUNNEL_IP_FLAGS */
934 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
935 /* LWTUNNEL_IP_OPTS */
936 }
937
ip_tun_cmp_encap(struct lwtunnel_state * a,struct lwtunnel_state * b)938 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
939 {
940 struct ip_tunnel_info *info_a = lwt_tun_info(a);
941 struct ip_tunnel_info *info_b = lwt_tun_info(b);
942
943 return memcmp(info_a, info_b, sizeof(info_a->key)) ||
944 info_a->mode != info_b->mode ||
945 info_a->options_len != info_b->options_len ||
946 memcmp(ip_tunnel_info_opts(info_a),
947 ip_tunnel_info_opts(info_b), info_a->options_len);
948 }
949
950 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
951 .build_state = ip_tun_build_state,
952 .destroy_state = ip_tun_destroy_state,
953 .fill_encap = ip_tun_fill_encap_info,
954 .get_encap_size = ip_tun_encap_nlsize,
955 .cmp_encap = ip_tun_cmp_encap,
956 .owner = THIS_MODULE,
957 };
958
959 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
960 [LWTUNNEL_IP6_UNSPEC] = { .strict_start_type = LWTUNNEL_IP6_OPTS },
961 [LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
962 [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
963 [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
964 [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
965 [LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
966 [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
967 [LWTUNNEL_IP6_OPTS] = { .type = NLA_NESTED },
968 };
969
ip6_tun_build_state(struct net * net,struct nlattr * attr,unsigned int family,const void * cfg,struct lwtunnel_state ** ts,struct netlink_ext_ack * extack)970 static int ip6_tun_build_state(struct net *net, struct nlattr *attr,
971 unsigned int family, const void *cfg,
972 struct lwtunnel_state **ts,
973 struct netlink_ext_ack *extack)
974 {
975 struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
976 struct lwtunnel_state *new_state;
977 struct ip_tunnel_info *tun_info;
978 int err, opt_len;
979
980 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr,
981 ip6_tun_policy, extack);
982 if (err < 0)
983 return err;
984
985 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack);
986 if (opt_len < 0)
987 return opt_len;
988
989 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
990 if (!new_state)
991 return -ENOMEM;
992
993 new_state->type = LWTUNNEL_ENCAP_IP6;
994
995 tun_info = lwt_tun_info(new_state);
996
997 err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack);
998 if (err < 0) {
999 lwtstate_free(new_state);
1000 return err;
1001 }
1002
1003 if (tb[LWTUNNEL_IP6_ID])
1004 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
1005
1006 if (tb[LWTUNNEL_IP6_DST])
1007 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
1008
1009 if (tb[LWTUNNEL_IP6_SRC])
1010 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
1011
1012 if (tb[LWTUNNEL_IP6_HOPLIMIT])
1013 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
1014
1015 if (tb[LWTUNNEL_IP6_TC])
1016 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
1017
1018 if (tb[LWTUNNEL_IP6_FLAGS]) {
1019 IP_TUNNEL_DECLARE_FLAGS(flags);
1020 __be16 data;
1021
1022 data = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
1023 ip_tunnel_flags_from_be16(flags, data);
1024 ip_tunnel_clear_options_present(flags);
1025
1026 ip_tunnel_flags_or(tun_info->key.tun_flags,
1027 tun_info->key.tun_flags, flags);
1028 }
1029
1030 tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
1031 tun_info->options_len = opt_len;
1032
1033 *ts = new_state;
1034
1035 return 0;
1036 }
1037
ip6_tun_fill_encap_info(struct sk_buff * skb,struct lwtunnel_state * lwtstate)1038 static int ip6_tun_fill_encap_info(struct sk_buff *skb,
1039 struct lwtunnel_state *lwtstate)
1040 {
1041 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
1042
1043 if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
1044 LWTUNNEL_IP6_PAD) ||
1045 nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
1046 nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
1047 nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
1048 nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
1049 nla_put_be16(skb, LWTUNNEL_IP6_FLAGS,
1050 ip_tunnel_flags_to_be16(tun_info->key.tun_flags)) ||
1051 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info))
1052 return -ENOMEM;
1053
1054 return 0;
1055 }
1056
ip6_tun_encap_nlsize(struct lwtunnel_state * lwtstate)1057 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
1058 {
1059 return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */
1060 + nla_total_size(16) /* LWTUNNEL_IP6_DST */
1061 + nla_total_size(16) /* LWTUNNEL_IP6_SRC */
1062 + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */
1063 + nla_total_size(1) /* LWTUNNEL_IP6_TC */
1064 + nla_total_size(2) /* LWTUNNEL_IP6_FLAGS */
1065 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
1066 /* LWTUNNEL_IP6_OPTS */
1067 }
1068
1069 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
1070 .build_state = ip6_tun_build_state,
1071 .fill_encap = ip6_tun_fill_encap_info,
1072 .get_encap_size = ip6_tun_encap_nlsize,
1073 .cmp_encap = ip_tun_cmp_encap,
1074 .owner = THIS_MODULE,
1075 };
1076
ip_tunnel_core_init(void)1077 void __init ip_tunnel_core_init(void)
1078 {
1079 /* If you land here, make sure whether increasing ip_tunnel_info's
1080 * options_len is a reasonable choice with its usage in front ends
1081 * (f.e., it's part of flow keys, etc).
1082 */
1083 BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
1084
1085 lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
1086 lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
1087 }
1088
1089 DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
1090 EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
1091
ip_tunnel_need_metadata(void)1092 void ip_tunnel_need_metadata(void)
1093 {
1094 static_branch_inc(&ip_tunnel_metadata_cnt);
1095 }
1096 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
1097
ip_tunnel_unneed_metadata(void)1098 void ip_tunnel_unneed_metadata(void)
1099 {
1100 static_branch_dec(&ip_tunnel_metadata_cnt);
1101 }
1102 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
1103
1104 /* Returns either the correct skb->protocol value, or 0 if invalid. */
ip_tunnel_parse_protocol(const struct sk_buff * skb)1105 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb)
1106 {
1107 if (skb_network_header(skb) >= skb->head &&
1108 (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) &&
1109 ip_hdr(skb)->version == 4)
1110 return htons(ETH_P_IP);
1111 if (skb_network_header(skb) >= skb->head &&
1112 (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) &&
1113 ipv6_hdr(skb)->version == 6)
1114 return htons(ETH_P_IPV6);
1115 return 0;
1116 }
1117 EXPORT_SYMBOL(ip_tunnel_parse_protocol);
1118
1119 const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol };
1120 EXPORT_SYMBOL(ip_tunnel_header_ops);
1121
1122 /* This function returns true when ENCAP attributes are present in the nl msg */
ip_tunnel_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * encap)1123 bool ip_tunnel_netlink_encap_parms(struct nlattr *data[],
1124 struct ip_tunnel_encap *encap)
1125 {
1126 bool ret = false;
1127
1128 memset(encap, 0, sizeof(*encap));
1129
1130 if (!data)
1131 return ret;
1132
1133 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1134 ret = true;
1135 encap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1136 }
1137
1138 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1139 ret = true;
1140 encap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1141 }
1142
1143 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1144 ret = true;
1145 encap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1146 }
1147
1148 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1149 ret = true;
1150 encap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1151 }
1152
1153 return ret;
1154 }
1155 EXPORT_SYMBOL_GPL(ip_tunnel_netlink_encap_parms);
1156
ip_tunnel_netlink_parms(struct nlattr * data[],struct ip_tunnel_parm_kern * parms)1157 void ip_tunnel_netlink_parms(struct nlattr *data[],
1158 struct ip_tunnel_parm_kern *parms)
1159 {
1160 if (data[IFLA_IPTUN_LINK])
1161 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1162
1163 if (data[IFLA_IPTUN_LOCAL])
1164 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1165
1166 if (data[IFLA_IPTUN_REMOTE])
1167 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1168
1169 if (data[IFLA_IPTUN_TTL]) {
1170 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1171 if (parms->iph.ttl)
1172 parms->iph.frag_off = htons(IP_DF);
1173 }
1174
1175 if (data[IFLA_IPTUN_TOS])
1176 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1177
1178 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1179 parms->iph.frag_off = htons(IP_DF);
1180
1181 if (data[IFLA_IPTUN_FLAGS]) {
1182 __be16 flags;
1183
1184 flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1185 ip_tunnel_flags_from_be16(parms->i_flags, flags);
1186 }
1187
1188 if (data[IFLA_IPTUN_PROTO])
1189 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1190 }
1191 EXPORT_SYMBOL_GPL(ip_tunnel_netlink_parms);
1192