Merge tag 'kvm-s390-next-6.6-1' of https://git.kernel.org/pub/scm/linux/kernel/git...
[platform/kernel/linux-starfive.git] / net / ipv4 / ip_tunnel_core.c
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            = htons(mtu),
226         };
227         icmph->checksum = csum_fold(skb_checksum(skb, 0, len, 0));
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, ntohs(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, ntohs(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_network_offset(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;
587         struct nlattr *nla;
588         __be16 type = 0;
589
590         if (!attr)
591                 return 0;
592
593         err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX,
594                            ip_opts_policy, extack);
595         if (err)
596                 return err;
597
598         nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
599                 switch (nla_type(nla)) {
600                 case LWTUNNEL_IP_OPTS_GENEVE:
601                         if (type && type != TUNNEL_GENEVE_OPT)
602                                 return -EINVAL;
603                         opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len,
604                                                            extack);
605                         if (opt_len < 0)
606                                 return opt_len;
607                         opts_len += opt_len;
608                         if (opts_len > IP_TUNNEL_OPTS_MAX)
609                                 return -EINVAL;
610                         type = TUNNEL_GENEVE_OPT;
611                         break;
612                 case LWTUNNEL_IP_OPTS_VXLAN:
613                         if (type)
614                                 return -EINVAL;
615                         opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len,
616                                                           extack);
617                         if (opt_len < 0)
618                                 return opt_len;
619                         opts_len += opt_len;
620                         type = TUNNEL_VXLAN_OPT;
621                         break;
622                 case LWTUNNEL_IP_OPTS_ERSPAN:
623                         if (type)
624                                 return -EINVAL;
625                         opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len,
626                                                            extack);
627                         if (opt_len < 0)
628                                 return opt_len;
629                         opts_len += opt_len;
630                         type = TUNNEL_ERSPAN_OPT;
631                         break;
632                 default:
633                         return -EINVAL;
634                 }
635         }
636
637         return opts_len;
638 }
639
640 static int ip_tun_get_optlen(struct nlattr *attr,
641                              struct netlink_ext_ack *extack)
642 {
643         return ip_tun_parse_opts(attr, NULL, extack);
644 }
645
646 static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info,
647                            struct netlink_ext_ack *extack)
648 {
649         return ip_tun_parse_opts(attr, info, extack);
650 }
651
652 static int ip_tun_build_state(struct net *net, struct nlattr *attr,
653                               unsigned int family, const void *cfg,
654                               struct lwtunnel_state **ts,
655                               struct netlink_ext_ack *extack)
656 {
657         struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
658         struct lwtunnel_state *new_state;
659         struct ip_tunnel_info *tun_info;
660         int err, opt_len;
661
662         err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr,
663                                           ip_tun_policy, extack);
664         if (err < 0)
665                 return err;
666
667         opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack);
668         if (opt_len < 0)
669                 return opt_len;
670
671         new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
672         if (!new_state)
673                 return -ENOMEM;
674
675         new_state->type = LWTUNNEL_ENCAP_IP;
676
677         tun_info = lwt_tun_info(new_state);
678
679         err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack);
680         if (err < 0) {
681                 lwtstate_free(new_state);
682                 return err;
683         }
684
685 #ifdef CONFIG_DST_CACHE
686         err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL);
687         if (err) {
688                 lwtstate_free(new_state);
689                 return err;
690         }
691 #endif
692
693         if (tb[LWTUNNEL_IP_ID])
694                 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
695
696         if (tb[LWTUNNEL_IP_DST])
697                 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
698
699         if (tb[LWTUNNEL_IP_SRC])
700                 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
701
702         if (tb[LWTUNNEL_IP_TTL])
703                 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
704
705         if (tb[LWTUNNEL_IP_TOS])
706                 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
707
708         if (tb[LWTUNNEL_IP_FLAGS])
709                 tun_info->key.tun_flags |=
710                                 (nla_get_be16(tb[LWTUNNEL_IP_FLAGS]) &
711                                  ~TUNNEL_OPTIONS_PRESENT);
712
713         tun_info->mode = IP_TUNNEL_INFO_TX;
714         tun_info->options_len = opt_len;
715
716         *ts = new_state;
717
718         return 0;
719 }
720
721 static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate)
722 {
723 #ifdef CONFIG_DST_CACHE
724         struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
725
726         dst_cache_destroy(&tun_info->dst_cache);
727 #endif
728 }
729
730 static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb,
731                                          struct ip_tunnel_info *tun_info)
732 {
733         struct geneve_opt *opt;
734         struct nlattr *nest;
735         int offset = 0;
736
737         nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE);
738         if (!nest)
739                 return -ENOMEM;
740
741         while (tun_info->options_len > offset) {
742                 opt = ip_tunnel_info_opts(tun_info) + offset;
743                 if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS,
744                                  opt->opt_class) ||
745                     nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) ||
746                     nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4,
747                             opt->opt_data)) {
748                         nla_nest_cancel(skb, nest);
749                         return -ENOMEM;
750                 }
751                 offset += sizeof(*opt) + opt->length * 4;
752         }
753
754         nla_nest_end(skb, nest);
755         return 0;
756 }
757
758 static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb,
759                                         struct ip_tunnel_info *tun_info)
760 {
761         struct vxlan_metadata *md;
762         struct nlattr *nest;
763
764         nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN);
765         if (!nest)
766                 return -ENOMEM;
767
768         md = ip_tunnel_info_opts(tun_info);
769         if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) {
770                 nla_nest_cancel(skb, nest);
771                 return -ENOMEM;
772         }
773
774         nla_nest_end(skb, nest);
775         return 0;
776 }
777
778 static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb,
779                                          struct ip_tunnel_info *tun_info)
780 {
781         struct erspan_metadata *md;
782         struct nlattr *nest;
783
784         nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN);
785         if (!nest)
786                 return -ENOMEM;
787
788         md = ip_tunnel_info_opts(tun_info);
789         if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version))
790                 goto err;
791
792         if (md->version == 1 &&
793             nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index))
794                 goto err;
795
796         if (md->version == 2 &&
797             (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) ||
798              nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID,
799                         get_hwid(&md->u.md2))))
800                 goto err;
801
802         nla_nest_end(skb, nest);
803         return 0;
804 err:
805         nla_nest_cancel(skb, nest);
806         return -ENOMEM;
807 }
808
809 static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type,
810                                   struct ip_tunnel_info *tun_info)
811 {
812         struct nlattr *nest;
813         int err = 0;
814
815         if (!(tun_info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
816                 return 0;
817
818         nest = nla_nest_start_noflag(skb, type);
819         if (!nest)
820                 return -ENOMEM;
821
822         if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT)
823                 err = ip_tun_fill_encap_opts_geneve(skb, tun_info);
824         else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT)
825                 err = ip_tun_fill_encap_opts_vxlan(skb, tun_info);
826         else if (tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)
827                 err = ip_tun_fill_encap_opts_erspan(skb, tun_info);
828
829         if (err) {
830                 nla_nest_cancel(skb, nest);
831                 return err;
832         }
833
834         nla_nest_end(skb, nest);
835         return 0;
836 }
837
838 static int ip_tun_fill_encap_info(struct sk_buff *skb,
839                                   struct lwtunnel_state *lwtstate)
840 {
841         struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
842
843         if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
844                          LWTUNNEL_IP_PAD) ||
845             nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
846             nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
847             nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
848             nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
849             nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) ||
850             ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info))
851                 return -ENOMEM;
852
853         return 0;
854 }
855
856 static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
857 {
858         int opt_len;
859
860         if (!(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
861                 return 0;
862
863         opt_len = nla_total_size(0);            /* LWTUNNEL_IP_OPTS */
864         if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
865                 struct geneve_opt *opt;
866                 int offset = 0;
867
868                 opt_len += nla_total_size(0);   /* LWTUNNEL_IP_OPTS_GENEVE */
869                 while (info->options_len > offset) {
870                         opt = ip_tunnel_info_opts(info) + offset;
871                         opt_len += nla_total_size(2)    /* OPT_GENEVE_CLASS */
872                                    + nla_total_size(1)  /* OPT_GENEVE_TYPE */
873                                    + nla_total_size(opt->length * 4);
874                                                         /* OPT_GENEVE_DATA */
875                         offset += sizeof(*opt) + opt->length * 4;
876                 }
877         } else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
878                 opt_len += nla_total_size(0)    /* LWTUNNEL_IP_OPTS_VXLAN */
879                            + nla_total_size(4); /* OPT_VXLAN_GBP */
880         } else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) {
881                 struct erspan_metadata *md = ip_tunnel_info_opts(info);
882
883                 opt_len += nla_total_size(0)    /* LWTUNNEL_IP_OPTS_ERSPAN */
884                            + nla_total_size(1)  /* OPT_ERSPAN_VER */
885                            + (md->version == 1 ? nla_total_size(4)
886                                                 /* OPT_ERSPAN_INDEX (v1) */
887                                                : nla_total_size(1) +
888                                                  nla_total_size(1));
889                                                 /* OPT_ERSPAN_DIR + HWID (v2) */
890         }
891
892         return opt_len;
893 }
894
895 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
896 {
897         return nla_total_size_64bit(8)  /* LWTUNNEL_IP_ID */
898                 + nla_total_size(4)     /* LWTUNNEL_IP_DST */
899                 + nla_total_size(4)     /* LWTUNNEL_IP_SRC */
900                 + nla_total_size(1)     /* LWTUNNEL_IP_TOS */
901                 + nla_total_size(1)     /* LWTUNNEL_IP_TTL */
902                 + nla_total_size(2)     /* LWTUNNEL_IP_FLAGS */
903                 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
904                                         /* LWTUNNEL_IP_OPTS */
905 }
906
907 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
908 {
909         struct ip_tunnel_info *info_a = lwt_tun_info(a);
910         struct ip_tunnel_info *info_b = lwt_tun_info(b);
911
912         return memcmp(info_a, info_b, sizeof(info_a->key)) ||
913                info_a->mode != info_b->mode ||
914                info_a->options_len != info_b->options_len ||
915                memcmp(ip_tunnel_info_opts(info_a),
916                       ip_tunnel_info_opts(info_b), info_a->options_len);
917 }
918
919 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
920         .build_state = ip_tun_build_state,
921         .destroy_state = ip_tun_destroy_state,
922         .fill_encap = ip_tun_fill_encap_info,
923         .get_encap_size = ip_tun_encap_nlsize,
924         .cmp_encap = ip_tun_cmp_encap,
925         .owner = THIS_MODULE,
926 };
927
928 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
929         [LWTUNNEL_IP6_UNSPEC]   = { .strict_start_type = LWTUNNEL_IP6_OPTS },
930         [LWTUNNEL_IP6_ID]               = { .type = NLA_U64 },
931         [LWTUNNEL_IP6_DST]              = { .len = sizeof(struct in6_addr) },
932         [LWTUNNEL_IP6_SRC]              = { .len = sizeof(struct in6_addr) },
933         [LWTUNNEL_IP6_HOPLIMIT]         = { .type = NLA_U8 },
934         [LWTUNNEL_IP6_TC]               = { .type = NLA_U8 },
935         [LWTUNNEL_IP6_FLAGS]            = { .type = NLA_U16 },
936         [LWTUNNEL_IP6_OPTS]             = { .type = NLA_NESTED },
937 };
938
939 static int ip6_tun_build_state(struct net *net, struct nlattr *attr,
940                                unsigned int family, const void *cfg,
941                                struct lwtunnel_state **ts,
942                                struct netlink_ext_ack *extack)
943 {
944         struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
945         struct lwtunnel_state *new_state;
946         struct ip_tunnel_info *tun_info;
947         int err, opt_len;
948
949         err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr,
950                                           ip6_tun_policy, extack);
951         if (err < 0)
952                 return err;
953
954         opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack);
955         if (opt_len < 0)
956                 return opt_len;
957
958         new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
959         if (!new_state)
960                 return -ENOMEM;
961
962         new_state->type = LWTUNNEL_ENCAP_IP6;
963
964         tun_info = lwt_tun_info(new_state);
965
966         err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack);
967         if (err < 0) {
968                 lwtstate_free(new_state);
969                 return err;
970         }
971
972         if (tb[LWTUNNEL_IP6_ID])
973                 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
974
975         if (tb[LWTUNNEL_IP6_DST])
976                 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
977
978         if (tb[LWTUNNEL_IP6_SRC])
979                 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
980
981         if (tb[LWTUNNEL_IP6_HOPLIMIT])
982                 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
983
984         if (tb[LWTUNNEL_IP6_TC])
985                 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
986
987         if (tb[LWTUNNEL_IP6_FLAGS])
988                 tun_info->key.tun_flags |=
989                                 (nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]) &
990                                  ~TUNNEL_OPTIONS_PRESENT);
991
992         tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
993         tun_info->options_len = opt_len;
994
995         *ts = new_state;
996
997         return 0;
998 }
999
1000 static int ip6_tun_fill_encap_info(struct sk_buff *skb,
1001                                    struct lwtunnel_state *lwtstate)
1002 {
1003         struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
1004
1005         if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
1006                          LWTUNNEL_IP6_PAD) ||
1007             nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
1008             nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
1009             nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
1010             nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
1011             nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) ||
1012             ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info))
1013                 return -ENOMEM;
1014
1015         return 0;
1016 }
1017
1018 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
1019 {
1020         return nla_total_size_64bit(8)  /* LWTUNNEL_IP6_ID */
1021                 + nla_total_size(16)    /* LWTUNNEL_IP6_DST */
1022                 + nla_total_size(16)    /* LWTUNNEL_IP6_SRC */
1023                 + nla_total_size(1)     /* LWTUNNEL_IP6_HOPLIMIT */
1024                 + nla_total_size(1)     /* LWTUNNEL_IP6_TC */
1025                 + nla_total_size(2)     /* LWTUNNEL_IP6_FLAGS */
1026                 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
1027                                         /* LWTUNNEL_IP6_OPTS */
1028 }
1029
1030 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
1031         .build_state = ip6_tun_build_state,
1032         .fill_encap = ip6_tun_fill_encap_info,
1033         .get_encap_size = ip6_tun_encap_nlsize,
1034         .cmp_encap = ip_tun_cmp_encap,
1035         .owner = THIS_MODULE,
1036 };
1037
1038 void __init ip_tunnel_core_init(void)
1039 {
1040         /* If you land here, make sure whether increasing ip_tunnel_info's
1041          * options_len is a reasonable choice with its usage in front ends
1042          * (f.e., it's part of flow keys, etc).
1043          */
1044         BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
1045
1046         lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
1047         lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
1048 }
1049
1050 DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
1051 EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
1052
1053 void ip_tunnel_need_metadata(void)
1054 {
1055         static_branch_inc(&ip_tunnel_metadata_cnt);
1056 }
1057 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
1058
1059 void ip_tunnel_unneed_metadata(void)
1060 {
1061         static_branch_dec(&ip_tunnel_metadata_cnt);
1062 }
1063 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
1064
1065 /* Returns either the correct skb->protocol value, or 0 if invalid. */
1066 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb)
1067 {
1068         if (skb_network_header(skb) >= skb->head &&
1069             (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) &&
1070             ip_hdr(skb)->version == 4)
1071                 return htons(ETH_P_IP);
1072         if (skb_network_header(skb) >= skb->head &&
1073             (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) &&
1074             ipv6_hdr(skb)->version == 6)
1075                 return htons(ETH_P_IPV6);
1076         return 0;
1077 }
1078 EXPORT_SYMBOL(ip_tunnel_parse_protocol);
1079
1080 const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol };
1081 EXPORT_SYMBOL(ip_tunnel_header_ops);
1082
1083 /* This function returns true when ENCAP attributes are present in the nl msg */
1084 bool ip_tunnel_netlink_encap_parms(struct nlattr *data[],
1085                                    struct ip_tunnel_encap *encap)
1086 {
1087         bool ret = false;
1088
1089         memset(encap, 0, sizeof(*encap));
1090
1091         if (!data)
1092                 return ret;
1093
1094         if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1095                 ret = true;
1096                 encap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1097         }
1098
1099         if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1100                 ret = true;
1101                 encap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1102         }
1103
1104         if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1105                 ret = true;
1106                 encap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1107         }
1108
1109         if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1110                 ret = true;
1111                 encap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1112         }
1113
1114         return ret;
1115 }
1116 EXPORT_SYMBOL_GPL(ip_tunnel_netlink_encap_parms);
1117
1118 void ip_tunnel_netlink_parms(struct nlattr *data[],
1119                              struct ip_tunnel_parm *parms)
1120 {
1121         if (data[IFLA_IPTUN_LINK])
1122                 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1123
1124         if (data[IFLA_IPTUN_LOCAL])
1125                 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1126
1127         if (data[IFLA_IPTUN_REMOTE])
1128                 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1129
1130         if (data[IFLA_IPTUN_TTL]) {
1131                 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1132                 if (parms->iph.ttl)
1133                         parms->iph.frag_off = htons(IP_DF);
1134         }
1135
1136         if (data[IFLA_IPTUN_TOS])
1137                 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1138
1139         if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1140                 parms->iph.frag_off = htons(IP_DF);
1141
1142         if (data[IFLA_IPTUN_FLAGS])
1143                 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1144
1145         if (data[IFLA_IPTUN_PROTO])
1146                 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1147 }
1148 EXPORT_SYMBOL_GPL(ip_tunnel_netlink_parms);