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