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 (net %llu), fix it urgently!\n",
64 dev->name, dev_net(dev)->net_cookie);
65 DEV_STATS_INC(dev, tx_errors);
66 }
67 ip_rt_put(rt);
68 kfree_skb_reason(skb, SKB_DROP_REASON_RECURSION_LIMIT);
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;
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
230 err = pskb_trim(skb, 576 - sizeof(*niph) - sizeof(*icmph));
231 if (err)
232 return err;
233
234 len = skb->len + sizeof(*icmph);
235 err = skb_cow(skb, sizeof(*niph) + sizeof(*icmph) + ETH_HLEN);
236 if (err)
237 return err;
238 iph = ip_hdr(skb);
239 icmph = skb_push(skb, sizeof(*icmph));
240 *icmph = (struct icmphdr) {
241 .type = ICMP_DEST_UNREACH,
242 .code = ICMP_FRAG_NEEDED,
243 .checksum = 0,
244 .un.frag.__unused = 0,
245 .un.frag.mtu = htons(mtu),
246 };
247 icmph->checksum = csum_fold(skb_checksum(skb, 0, len, 0));
248 skb_reset_transport_header(skb);
249
250 niph = skb_push(skb, sizeof(*niph));
251 *niph = (struct iphdr) {
252 .ihl = sizeof(*niph) / 4u,
253 .version = 4,
254 .tos = 0,
255 .tot_len = htons(len + sizeof(*niph)),
256 .id = 0,
257 .frag_off = htons(IP_DF),
258 .ttl = iph->ttl,
259 .protocol = IPPROTO_ICMP,
260 .saddr = iph->daddr,
261 .daddr = iph->saddr,
262 };
263 ip_send_check(niph);
264 skb_reset_network_header(skb);
265
266 skb->ip_summed = CHECKSUM_NONE;
267
268 eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
269 skb_reset_mac_header(skb);
270
271 return skb->len;
272 }
273
274 /**
275 * iptunnel_pmtud_check_icmp() - Trigger ICMP reply if needed and allowed
276 * @skb: Buffer being sent by encapsulation, L2 headers expected
277 * @mtu: Network MTU for path
278 *
279 * Return: 0 for no ICMP reply, length if built, negative value on error.
280 */
iptunnel_pmtud_check_icmp(struct sk_buff * skb,int mtu)281 static int iptunnel_pmtud_check_icmp(struct sk_buff *skb, int mtu)
282 {
283 const struct iphdr *iph = ip_hdr(skb);
284
285 if (mtu < 576 || iph->frag_off != htons(IP_DF))
286 return 0;
287
288 if (ipv4_is_lbcast(iph->daddr) || ipv4_is_multicast(iph->daddr) ||
289 ipv4_is_zeronet(iph->saddr) || ipv4_is_loopback(iph->saddr) ||
290 ipv4_is_lbcast(iph->saddr) || ipv4_is_multicast(iph->saddr))
291 return 0;
292
293 if (iph->protocol == IPPROTO_ICMP) {
294 const struct icmphdr *icmph;
295
296 if (!pskb_network_may_pull(skb, iph->ihl * 4 +
297 offsetofend(struct icmphdr, type)))
298 return 0;
299 iph = ip_hdr(skb);
300 icmph = (void *)iph + iph->ihl * 4;
301 if (icmp_is_err(icmph->type))
302 return 0;
303 }
304 return iptunnel_pmtud_build_icmp(skb, mtu);
305 }
306
307 #if IS_ENABLED(CONFIG_IPV6)
308 /**
309 * iptunnel_pmtud_build_icmpv6() - Build ICMPv6 error message for PMTUD
310 * @skb: Original packet with L2 header
311 * @mtu: MTU value for ICMPv6 error
312 *
313 * Return: length on success, negative error code if message couldn't be built.
314 */
iptunnel_pmtud_build_icmpv6(struct sk_buff * skb,int mtu)315 static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb, int mtu)
316 {
317 const struct ipv6hdr *ip6h;
318 struct icmp6hdr *icmp6h;
319 struct ipv6hdr *nip6h;
320 struct ethhdr eh;
321 int len, err;
322 __wsum csum;
323
324 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
325 return -EINVAL;
326
327 if (skb_is_gso(skb))
328 skb_gso_reset(skb);
329
330 skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
331 pskb_pull(skb, ETH_HLEN);
332
333 err = pskb_trim(skb, IPV6_MIN_MTU - sizeof(*nip6h) - sizeof(*icmp6h));
334 if (err)
335 return err;
336
337 len = skb->len + sizeof(*icmp6h);
338 err = skb_cow(skb, sizeof(*nip6h) + sizeof(*icmp6h) + ETH_HLEN);
339 if (err)
340 return err;
341
342 ip6h = ipv6_hdr(skb);
343 icmp6h = skb_push(skb, sizeof(*icmp6h));
344 *icmp6h = (struct icmp6hdr) {
345 .icmp6_type = ICMPV6_PKT_TOOBIG,
346 .icmp6_code = 0,
347 .icmp6_cksum = 0,
348 .icmp6_mtu = htonl(mtu),
349 };
350 skb_reset_transport_header(skb);
351
352 nip6h = skb_push(skb, sizeof(*nip6h));
353 *nip6h = (struct ipv6hdr) {
354 .priority = 0,
355 .version = 6,
356 .flow_lbl = { 0 },
357 .payload_len = htons(len),
358 .nexthdr = IPPROTO_ICMPV6,
359 .hop_limit = ip6h->hop_limit,
360 .saddr = ip6h->daddr,
361 .daddr = ip6h->saddr,
362 };
363 skb_reset_network_header(skb);
364
365 csum = skb_checksum(skb, skb_transport_offset(skb), len, 0);
366 icmp6h->icmp6_cksum = csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr, len,
367 IPPROTO_ICMPV6, csum);
368
369 skb->ip_summed = CHECKSUM_NONE;
370
371 eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
372 skb_reset_mac_header(skb);
373
374 return skb->len;
375 }
376
377 /**
378 * iptunnel_pmtud_check_icmpv6() - Trigger ICMPv6 reply if needed and allowed
379 * @skb: Buffer being sent by encapsulation, L2 headers expected
380 * @mtu: Network MTU for path
381 *
382 * Return: 0 for no ICMPv6 reply, length if built, negative value on error.
383 */
iptunnel_pmtud_check_icmpv6(struct sk_buff * skb,int mtu)384 static int iptunnel_pmtud_check_icmpv6(struct sk_buff *skb, int mtu)
385 {
386 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
387 int stype = ipv6_addr_type(&ip6h->saddr);
388 u8 proto = ip6h->nexthdr;
389 __be16 frag_off;
390 int offset;
391
392 if (mtu < IPV6_MIN_MTU)
393 return 0;
394
395 if (stype == IPV6_ADDR_ANY || stype == IPV6_ADDR_MULTICAST ||
396 stype == IPV6_ADDR_LOOPBACK)
397 return 0;
398
399 offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto,
400 &frag_off);
401 if (offset < 0 || (frag_off & htons(~0x7)))
402 return 0;
403
404 if (proto == IPPROTO_ICMPV6) {
405 struct icmp6hdr *icmp6h;
406
407 if (!pskb_may_pull(skb, skb_network_header(skb) +
408 offset + 1 - skb->data))
409 return 0;
410
411 icmp6h = (struct icmp6hdr *)(skb_network_header(skb) + offset);
412 if (icmpv6_is_err(icmp6h->icmp6_type) ||
413 icmp6h->icmp6_type == NDISC_REDIRECT)
414 return 0;
415 }
416
417 return iptunnel_pmtud_build_icmpv6(skb, mtu);
418 }
419 #endif /* IS_ENABLED(CONFIG_IPV6) */
420
421 /**
422 * skb_tunnel_check_pmtu() - Check, update PMTU and trigger ICMP reply as needed
423 * @skb: Buffer being sent by encapsulation, L2 headers expected
424 * @encap_dst: Destination for tunnel encapsulation (outer IP)
425 * @headroom: Encapsulation header size, bytes
426 * @reply: Build matching ICMP or ICMPv6 message as a result
427 *
428 * L2 tunnel implementations that can carry IP and can be directly bridged
429 * (currently UDP tunnels) can't always rely on IP forwarding paths to handle
430 * PMTU discovery. In the bridged case, ICMP or ICMPv6 messages need to be built
431 * based on payload and sent back by the encapsulation itself.
432 *
433 * For routable interfaces, we just need to update the PMTU for the destination.
434 *
435 * Return: 0 if ICMP error not needed, length if built, negative value on error
436 */
skb_tunnel_check_pmtu(struct sk_buff * skb,struct dst_entry * encap_dst,int headroom,bool reply)437 int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
438 int headroom, bool reply)
439 {
440 u32 mtu = dst_mtu(encap_dst) - headroom;
441
442 if ((skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) ||
443 (!skb_is_gso(skb) && (skb->len - skb_network_offset(skb)) <= mtu))
444 return 0;
445
446 skb_dst_update_pmtu_no_confirm(skb, mtu);
447
448 if (!reply)
449 return 0;
450
451 if (skb->protocol == htons(ETH_P_IP))
452 return iptunnel_pmtud_check_icmp(skb, mtu);
453
454 #if IS_ENABLED(CONFIG_IPV6)
455 if (skb->protocol == htons(ETH_P_IPV6))
456 return iptunnel_pmtud_check_icmpv6(skb, mtu);
457 #endif
458 return 0;
459 }
460 EXPORT_SYMBOL(skb_tunnel_check_pmtu);
461
462 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
463 [LWTUNNEL_IP_UNSPEC] = { .strict_start_type = LWTUNNEL_IP_OPTS },
464 [LWTUNNEL_IP_ID] = { .type = NLA_U64 },
465 [LWTUNNEL_IP_DST] = { .type = NLA_U32 },
466 [LWTUNNEL_IP_SRC] = { .type = NLA_U32 },
467 [LWTUNNEL_IP_TTL] = { .type = NLA_U8 },
468 [LWTUNNEL_IP_TOS] = { .type = NLA_U8 },
469 [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
470 [LWTUNNEL_IP_OPTS] = { .type = NLA_NESTED },
471 };
472
473 static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = {
474 [LWTUNNEL_IP_OPTS_GENEVE] = { .type = NLA_NESTED },
475 [LWTUNNEL_IP_OPTS_VXLAN] = { .type = NLA_NESTED },
476 [LWTUNNEL_IP_OPTS_ERSPAN] = { .type = NLA_NESTED },
477 };
478
479 static const struct nla_policy
480 geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = {
481 [LWTUNNEL_IP_OPT_GENEVE_CLASS] = { .type = NLA_U16 },
482 [LWTUNNEL_IP_OPT_GENEVE_TYPE] = { .type = NLA_U8 },
483 [LWTUNNEL_IP_OPT_GENEVE_DATA] = { .type = NLA_BINARY, .len = 127 },
484 };
485
486 static const struct nla_policy
487 vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = {
488 [LWTUNNEL_IP_OPT_VXLAN_GBP] = { .type = NLA_U32 },
489 };
490
491 static const struct nla_policy
492 erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = {
493 [LWTUNNEL_IP_OPT_ERSPAN_VER] = { .type = NLA_U8 },
494 [LWTUNNEL_IP_OPT_ERSPAN_INDEX] = { .type = NLA_U32 },
495 [LWTUNNEL_IP_OPT_ERSPAN_DIR] = { .type = NLA_U8 },
496 [LWTUNNEL_IP_OPT_ERSPAN_HWID] = { .type = NLA_U8 },
497 };
498
ip_tun_parse_opts_geneve(struct nlattr * attr,struct ip_tunnel_info * info,int opts_len,struct netlink_ext_ack * extack)499 static int ip_tun_parse_opts_geneve(struct nlattr *attr,
500 struct ip_tunnel_info *info, int opts_len,
501 struct netlink_ext_ack *extack)
502 {
503 struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1];
504 int data_len, err;
505
506 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr,
507 geneve_opt_policy, extack);
508 if (err)
509 return err;
510
511 if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] ||
512 !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] ||
513 !tb[LWTUNNEL_IP_OPT_GENEVE_DATA])
514 return -EINVAL;
515
516 attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];
517 data_len = nla_len(attr);
518 if (data_len % 4)
519 return -EINVAL;
520
521 if (info) {
522 struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;
523
524 memcpy(opt->opt_data, nla_data(attr), data_len);
525 opt->length = data_len / 4;
526 attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS];
527 opt->opt_class = nla_get_be16(attr);
528 attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE];
529 opt->type = nla_get_u8(attr);
530 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags);
531 }
532
533 return sizeof(struct geneve_opt) + data_len;
534 }
535
ip_tun_parse_opts_vxlan(struct nlattr * attr,struct ip_tunnel_info * info,int opts_len,struct netlink_ext_ack * extack)536 static int ip_tun_parse_opts_vxlan(struct nlattr *attr,
537 struct ip_tunnel_info *info, int opts_len,
538 struct netlink_ext_ack *extack)
539 {
540 struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1];
541 int err;
542
543 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr,
544 vxlan_opt_policy, extack);
545 if (err)
546 return err;
547
548 if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP])
549 return -EINVAL;
550
551 if (info) {
552 struct vxlan_metadata *md =
553 ip_tunnel_info_opts(info) + opts_len;
554
555 attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP];
556 md->gbp = nla_get_u32(attr);
557 md->gbp &= VXLAN_GBP_MASK;
558 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags);
559 }
560
561 return sizeof(struct vxlan_metadata);
562 }
563
ip_tun_parse_opts_erspan(struct nlattr * attr,struct ip_tunnel_info * info,int opts_len,struct netlink_ext_ack * extack)564 static int ip_tun_parse_opts_erspan(struct nlattr *attr,
565 struct ip_tunnel_info *info, int opts_len,
566 struct netlink_ext_ack *extack)
567 {
568 struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1];
569 int err;
570 u8 ver;
571
572 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr,
573 erspan_opt_policy, extack);
574 if (err)
575 return err;
576
577 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER])
578 return -EINVAL;
579
580 ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]);
581 if (ver == 1) {
582 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX])
583 return -EINVAL;
584 } else if (ver == 2) {
585 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] ||
586 !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID])
587 return -EINVAL;
588 } else {
589 return -EINVAL;
590 }
591
592 if (info) {
593 struct erspan_metadata *md =
594 ip_tunnel_info_opts(info) + opts_len;
595
596 md->version = ver;
597 if (ver == 1) {
598 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX];
599 md->u.index = nla_get_be32(attr);
600 } else {
601 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR];
602 md->u.md2.dir = nla_get_u8(attr);
603 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID];
604 set_hwid(&md->u.md2, nla_get_u8(attr));
605 }
606
607 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, info->key.tun_flags);
608 }
609
610 return sizeof(struct erspan_metadata);
611 }
612
ip_tun_parse_opts(struct nlattr * attr,struct ip_tunnel_info * info,struct netlink_ext_ack * extack)613 static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info,
614 struct netlink_ext_ack *extack)
615 {
616 int err, rem, opt_len, opts_len = 0;
617 struct nlattr *nla;
618 u32 type = 0;
619
620 if (!attr)
621 return 0;
622
623 err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX,
624 ip_opts_policy, extack);
625 if (err)
626 return err;
627
628 nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
629 switch (nla_type(nla)) {
630 case LWTUNNEL_IP_OPTS_GENEVE:
631 if (type && type != IP_TUNNEL_GENEVE_OPT_BIT)
632 return -EINVAL;
633 opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len,
634 extack);
635 if (opt_len < 0)
636 return opt_len;
637 opts_len += opt_len;
638 if (opts_len > IP_TUNNEL_OPTS_MAX)
639 return -EINVAL;
640 type = IP_TUNNEL_GENEVE_OPT_BIT;
641 break;
642 case LWTUNNEL_IP_OPTS_VXLAN:
643 if (type)
644 return -EINVAL;
645 opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len,
646 extack);
647 if (opt_len < 0)
648 return opt_len;
649 opts_len += opt_len;
650 type = IP_TUNNEL_VXLAN_OPT_BIT;
651 break;
652 case LWTUNNEL_IP_OPTS_ERSPAN:
653 if (type)
654 return -EINVAL;
655 opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len,
656 extack);
657 if (opt_len < 0)
658 return opt_len;
659 opts_len += opt_len;
660 type = IP_TUNNEL_ERSPAN_OPT_BIT;
661 break;
662 default:
663 return -EINVAL;
664 }
665 }
666
667 return opts_len;
668 }
669
ip_tun_get_optlen(struct nlattr * attr,struct netlink_ext_ack * extack)670 static int ip_tun_get_optlen(struct nlattr *attr,
671 struct netlink_ext_ack *extack)
672 {
673 return ip_tun_parse_opts(attr, NULL, extack);
674 }
675
ip_tun_set_opts(struct nlattr * attr,struct ip_tunnel_info * info,struct netlink_ext_ack * extack)676 static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info,
677 struct netlink_ext_ack *extack)
678 {
679 return ip_tun_parse_opts(attr, info, extack);
680 }
681
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)682 static int ip_tun_build_state(struct net *net, struct nlattr *attr,
683 unsigned int family, const void *cfg,
684 struct lwtunnel_state **ts,
685 struct netlink_ext_ack *extack)
686 {
687 struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
688 struct lwtunnel_state *new_state;
689 struct ip_tunnel_info *tun_info;
690 int err, opt_len;
691
692 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr,
693 ip_tun_policy, extack);
694 if (err < 0)
695 return err;
696
697 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack);
698 if (opt_len < 0)
699 return opt_len;
700
701 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
702 if (!new_state)
703 return -ENOMEM;
704
705 new_state->type = LWTUNNEL_ENCAP_IP;
706
707 tun_info = lwt_tun_info(new_state);
708
709 err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack);
710 if (err < 0) {
711 lwtstate_free(new_state);
712 return err;
713 }
714
715 #ifdef CONFIG_DST_CACHE
716 err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL);
717 if (err) {
718 lwtstate_free(new_state);
719 return err;
720 }
721 #endif
722
723 if (tb[LWTUNNEL_IP_ID])
724 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
725
726 if (tb[LWTUNNEL_IP_DST])
727 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
728
729 if (tb[LWTUNNEL_IP_SRC])
730 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
731
732 if (tb[LWTUNNEL_IP_TTL])
733 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
734
735 if (tb[LWTUNNEL_IP_TOS])
736 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
737
738 if (tb[LWTUNNEL_IP_FLAGS]) {
739 IP_TUNNEL_DECLARE_FLAGS(flags);
740
741 ip_tunnel_flags_from_be16(flags,
742 nla_get_be16(tb[LWTUNNEL_IP_FLAGS]));
743 ip_tunnel_clear_options_present(flags);
744
745 ip_tunnel_flags_or(tun_info->key.tun_flags,
746 tun_info->key.tun_flags, flags);
747 }
748
749 tun_info->mode = IP_TUNNEL_INFO_TX;
750 tun_info->options_len = opt_len;
751
752 *ts = new_state;
753
754 return 0;
755 }
756
ip_tun_destroy_state(struct lwtunnel_state * lwtstate)757 static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate)
758 {
759 #ifdef CONFIG_DST_CACHE
760 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
761
762 dst_cache_destroy(&tun_info->dst_cache);
763 #endif
764 }
765
ip_tun_fill_encap_opts_geneve(struct sk_buff * skb,struct ip_tunnel_info * tun_info)766 static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb,
767 struct ip_tunnel_info *tun_info)
768 {
769 struct geneve_opt *opt;
770 struct nlattr *nest;
771 int offset = 0;
772
773 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE);
774 if (!nest)
775 return -ENOMEM;
776
777 while (tun_info->options_len > offset) {
778 opt = ip_tunnel_info_opts(tun_info) + offset;
779 if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS,
780 opt->opt_class) ||
781 nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) ||
782 nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4,
783 opt->opt_data)) {
784 nla_nest_cancel(skb, nest);
785 return -ENOMEM;
786 }
787 offset += sizeof(*opt) + opt->length * 4;
788 }
789
790 nla_nest_end(skb, nest);
791 return 0;
792 }
793
ip_tun_fill_encap_opts_vxlan(struct sk_buff * skb,struct ip_tunnel_info * tun_info)794 static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb,
795 struct ip_tunnel_info *tun_info)
796 {
797 struct vxlan_metadata *md;
798 struct nlattr *nest;
799
800 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN);
801 if (!nest)
802 return -ENOMEM;
803
804 md = ip_tunnel_info_opts(tun_info);
805 if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) {
806 nla_nest_cancel(skb, nest);
807 return -ENOMEM;
808 }
809
810 nla_nest_end(skb, nest);
811 return 0;
812 }
813
ip_tun_fill_encap_opts_erspan(struct sk_buff * skb,struct ip_tunnel_info * tun_info)814 static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb,
815 struct ip_tunnel_info *tun_info)
816 {
817 struct erspan_metadata *md;
818 struct nlattr *nest;
819
820 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN);
821 if (!nest)
822 return -ENOMEM;
823
824 md = ip_tunnel_info_opts(tun_info);
825 if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version))
826 goto err;
827
828 if (md->version == 1 &&
829 nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index))
830 goto err;
831
832 if (md->version == 2 &&
833 (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) ||
834 nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID,
835 get_hwid(&md->u.md2))))
836 goto err;
837
838 nla_nest_end(skb, nest);
839 return 0;
840 err:
841 nla_nest_cancel(skb, nest);
842 return -ENOMEM;
843 }
844
ip_tun_fill_encap_opts(struct sk_buff * skb,int type,struct ip_tunnel_info * tun_info)845 static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type,
846 struct ip_tunnel_info *tun_info)
847 {
848 struct nlattr *nest;
849 int err = 0;
850
851 if (!ip_tunnel_is_options_present(tun_info->key.tun_flags))
852 return 0;
853
854 nest = nla_nest_start_noflag(skb, type);
855 if (!nest)
856 return -ENOMEM;
857
858 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, tun_info->key.tun_flags))
859 err = ip_tun_fill_encap_opts_geneve(skb, tun_info);
860 else if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, tun_info->key.tun_flags))
861 err = ip_tun_fill_encap_opts_vxlan(skb, tun_info);
862 else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, tun_info->key.tun_flags))
863 err = ip_tun_fill_encap_opts_erspan(skb, tun_info);
864
865 if (err) {
866 nla_nest_cancel(skb, nest);
867 return err;
868 }
869
870 nla_nest_end(skb, nest);
871 return 0;
872 }
873
ip_tun_fill_encap_info(struct sk_buff * skb,struct lwtunnel_state * lwtstate)874 static int ip_tun_fill_encap_info(struct sk_buff *skb,
875 struct lwtunnel_state *lwtstate)
876 {
877 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
878
879 if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
880 LWTUNNEL_IP_PAD) ||
881 nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
882 nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
883 nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
884 nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
885 nla_put_be16(skb, LWTUNNEL_IP_FLAGS,
886 ip_tunnel_flags_to_be16(tun_info->key.tun_flags)) ||
887 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info))
888 return -ENOMEM;
889
890 return 0;
891 }
892
ip_tun_opts_nlsize(struct ip_tunnel_info * info)893 static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
894 {
895 int opt_len;
896
897 if (!ip_tunnel_is_options_present(info->key.tun_flags))
898 return 0;
899
900 opt_len = nla_total_size(0); /* LWTUNNEL_IP_OPTS */
901 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags)) {
902 struct geneve_opt *opt;
903 int offset = 0;
904
905 opt_len += nla_total_size(0); /* LWTUNNEL_IP_OPTS_GENEVE */
906 while (info->options_len > offset) {
907 opt = ip_tunnel_info_opts(info) + offset;
908 opt_len += nla_total_size(2) /* OPT_GENEVE_CLASS */
909 + nla_total_size(1) /* OPT_GENEVE_TYPE */
910 + nla_total_size(opt->length * 4);
911 /* OPT_GENEVE_DATA */
912 offset += sizeof(*opt) + opt->length * 4;
913 }
914 } else if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) {
915 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_VXLAN */
916 + nla_total_size(4); /* OPT_VXLAN_GBP */
917 } else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, info->key.tun_flags)) {
918 struct erspan_metadata *md = ip_tunnel_info_opts(info);
919
920 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_ERSPAN */
921 + nla_total_size(1) /* OPT_ERSPAN_VER */
922 + (md->version == 1 ? nla_total_size(4)
923 /* OPT_ERSPAN_INDEX (v1) */
924 : nla_total_size(1) +
925 nla_total_size(1));
926 /* OPT_ERSPAN_DIR + HWID (v2) */
927 }
928
929 return opt_len;
930 }
931
ip_tun_encap_nlsize(struct lwtunnel_state * lwtstate)932 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
933 {
934 return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */
935 + nla_total_size(4) /* LWTUNNEL_IP_DST */
936 + nla_total_size(4) /* LWTUNNEL_IP_SRC */
937 + nla_total_size(1) /* LWTUNNEL_IP_TOS */
938 + nla_total_size(1) /* LWTUNNEL_IP_TTL */
939 + nla_total_size(2) /* LWTUNNEL_IP_FLAGS */
940 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
941 /* LWTUNNEL_IP_OPTS */
942 }
943
ip_tun_cmp_encap(struct lwtunnel_state * a,struct lwtunnel_state * b)944 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
945 {
946 struct ip_tunnel_info *info_a = lwt_tun_info(a);
947 struct ip_tunnel_info *info_b = lwt_tun_info(b);
948
949 return memcmp(info_a, info_b, sizeof(info_a->key)) ||
950 info_a->mode != info_b->mode ||
951 info_a->options_len != info_b->options_len ||
952 memcmp(ip_tunnel_info_opts(info_a),
953 ip_tunnel_info_opts(info_b), info_a->options_len);
954 }
955
956 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
957 .build_state = ip_tun_build_state,
958 .destroy_state = ip_tun_destroy_state,
959 .fill_encap = ip_tun_fill_encap_info,
960 .get_encap_size = ip_tun_encap_nlsize,
961 .cmp_encap = ip_tun_cmp_encap,
962 .owner = THIS_MODULE,
963 };
964
965 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
966 [LWTUNNEL_IP6_UNSPEC] = { .strict_start_type = LWTUNNEL_IP6_OPTS },
967 [LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
968 [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
969 [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
970 [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
971 [LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
972 [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
973 [LWTUNNEL_IP6_OPTS] = { .type = NLA_NESTED },
974 };
975
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)976 static int ip6_tun_build_state(struct net *net, struct nlattr *attr,
977 unsigned int family, const void *cfg,
978 struct lwtunnel_state **ts,
979 struct netlink_ext_ack *extack)
980 {
981 struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
982 struct lwtunnel_state *new_state;
983 struct ip_tunnel_info *tun_info;
984 int err, opt_len;
985
986 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr,
987 ip6_tun_policy, extack);
988 if (err < 0)
989 return err;
990
991 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack);
992 if (opt_len < 0)
993 return opt_len;
994
995 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
996 if (!new_state)
997 return -ENOMEM;
998
999 new_state->type = LWTUNNEL_ENCAP_IP6;
1000
1001 tun_info = lwt_tun_info(new_state);
1002
1003 err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack);
1004 if (err < 0) {
1005 lwtstate_free(new_state);
1006 return err;
1007 }
1008
1009 if (tb[LWTUNNEL_IP6_ID])
1010 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
1011
1012 if (tb[LWTUNNEL_IP6_DST])
1013 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
1014
1015 if (tb[LWTUNNEL_IP6_SRC])
1016 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
1017
1018 if (tb[LWTUNNEL_IP6_HOPLIMIT])
1019 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
1020
1021 if (tb[LWTUNNEL_IP6_TC])
1022 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
1023
1024 if (tb[LWTUNNEL_IP6_FLAGS]) {
1025 IP_TUNNEL_DECLARE_FLAGS(flags);
1026 __be16 data;
1027
1028 data = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
1029 ip_tunnel_flags_from_be16(flags, data);
1030 ip_tunnel_clear_options_present(flags);
1031
1032 ip_tunnel_flags_or(tun_info->key.tun_flags,
1033 tun_info->key.tun_flags, flags);
1034 }
1035
1036 tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
1037 tun_info->options_len = opt_len;
1038
1039 *ts = new_state;
1040
1041 return 0;
1042 }
1043
ip6_tun_fill_encap_info(struct sk_buff * skb,struct lwtunnel_state * lwtstate)1044 static int ip6_tun_fill_encap_info(struct sk_buff *skb,
1045 struct lwtunnel_state *lwtstate)
1046 {
1047 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
1048
1049 if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
1050 LWTUNNEL_IP6_PAD) ||
1051 nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
1052 nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
1053 nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
1054 nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
1055 nla_put_be16(skb, LWTUNNEL_IP6_FLAGS,
1056 ip_tunnel_flags_to_be16(tun_info->key.tun_flags)) ||
1057 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info))
1058 return -ENOMEM;
1059
1060 return 0;
1061 }
1062
ip6_tun_encap_nlsize(struct lwtunnel_state * lwtstate)1063 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
1064 {
1065 return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */
1066 + nla_total_size(16) /* LWTUNNEL_IP6_DST */
1067 + nla_total_size(16) /* LWTUNNEL_IP6_SRC */
1068 + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */
1069 + nla_total_size(1) /* LWTUNNEL_IP6_TC */
1070 + nla_total_size(2) /* LWTUNNEL_IP6_FLAGS */
1071 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
1072 /* LWTUNNEL_IP6_OPTS */
1073 }
1074
1075 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
1076 .build_state = ip6_tun_build_state,
1077 .fill_encap = ip6_tun_fill_encap_info,
1078 .get_encap_size = ip6_tun_encap_nlsize,
1079 .cmp_encap = ip_tun_cmp_encap,
1080 .owner = THIS_MODULE,
1081 };
1082
ip_tunnel_core_init(void)1083 void __init ip_tunnel_core_init(void)
1084 {
1085 /* If you land here, make sure whether increasing ip_tunnel_info's
1086 * options_len is a reasonable choice with its usage in front ends
1087 * (f.e., it's part of flow keys, etc).
1088 */
1089 BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
1090
1091 lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
1092 lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
1093 }
1094
1095 DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
1096 EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
1097
ip_tunnel_need_metadata(void)1098 void ip_tunnel_need_metadata(void)
1099 {
1100 static_branch_inc(&ip_tunnel_metadata_cnt);
1101 }
1102 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
1103
ip_tunnel_unneed_metadata(void)1104 void ip_tunnel_unneed_metadata(void)
1105 {
1106 static_branch_dec(&ip_tunnel_metadata_cnt);
1107 }
1108 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
1109
1110 /* Returns either the correct skb->protocol value, or 0 if invalid. */
ip_tunnel_parse_protocol(const struct sk_buff * skb)1111 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb)
1112 {
1113 if (skb_network_header(skb) >= skb->head &&
1114 (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) &&
1115 ip_hdr(skb)->version == 4)
1116 return htons(ETH_P_IP);
1117 if (skb_network_header(skb) >= skb->head &&
1118 (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) &&
1119 ipv6_hdr(skb)->version == 6)
1120 return htons(ETH_P_IPV6);
1121 return 0;
1122 }
1123 EXPORT_SYMBOL(ip_tunnel_parse_protocol);
1124
1125 const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol };
1126 EXPORT_SYMBOL(ip_tunnel_header_ops);
1127
1128 /* 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)1129 bool ip_tunnel_netlink_encap_parms(struct nlattr *data[],
1130 struct ip_tunnel_encap *encap)
1131 {
1132 bool ret = false;
1133
1134 memset(encap, 0, sizeof(*encap));
1135
1136 if (!data)
1137 return ret;
1138
1139 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1140 ret = true;
1141 encap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1142 }
1143
1144 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1145 ret = true;
1146 encap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1147 }
1148
1149 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1150 ret = true;
1151 encap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1152 }
1153
1154 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1155 ret = true;
1156 encap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1157 }
1158
1159 return ret;
1160 }
1161 EXPORT_SYMBOL_GPL(ip_tunnel_netlink_encap_parms);
1162
ip_tunnel_netlink_parms(struct nlattr * data[],struct ip_tunnel_parm_kern * parms)1163 void ip_tunnel_netlink_parms(struct nlattr *data[],
1164 struct ip_tunnel_parm_kern *parms)
1165 {
1166 if (data[IFLA_IPTUN_LINK])
1167 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1168
1169 if (data[IFLA_IPTUN_LOCAL])
1170 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1171
1172 if (data[IFLA_IPTUN_REMOTE])
1173 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1174
1175 if (data[IFLA_IPTUN_TTL]) {
1176 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1177 if (parms->iph.ttl)
1178 parms->iph.frag_off = htons(IP_DF);
1179 }
1180
1181 if (data[IFLA_IPTUN_TOS])
1182 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1183
1184 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1185 parms->iph.frag_off = htons(IP_DF);
1186
1187 if (data[IFLA_IPTUN_FLAGS]) {
1188 __be16 flags;
1189
1190 flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1191 ip_tunnel_flags_from_be16(parms->i_flags, flags);
1192 }
1193
1194 if (data[IFLA_IPTUN_PROTO])
1195 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1196 }
1197 EXPORT_SYMBOL_GPL(ip_tunnel_netlink_parms);
1198