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TOMOYO Linux Cross Reference
Linux/net/ipv4/ip_tunnel_core.c

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

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