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