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19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21#include <linux/types.h>
22#include <linux/kernel.h>
23#include <linux/skbuff.h>
24#include <linux/netdevice.h>
25#include <linux/in.h>
26#include <linux/if_arp.h>
27#include <linux/init.h>
28#include <linux/in6.h>
29#include <linux/inetdevice.h>
30#include <linux/netfilter_ipv4.h>
31#include <linux/etherdevice.h>
32#include <linux/if_ether.h>
33#include <linux/if_vlan.h>
34#include <linux/static_key.h>
35
36#include <net/ip.h>
37#include <net/icmp.h>
38#include <net/protocol.h>
39#include <net/ip_tunnels.h>
40#include <net/ip6_tunnel.h>
41#include <net/arp.h>
42#include <net/checksum.h>
43#include <net/dsfield.h>
44#include <net/inet_ecn.h>
45#include <net/xfrm.h>
46#include <net/net_namespace.h>
47#include <net/netns/generic.h>
48#include <net/rtnetlink.h>
49#include <net/dst_metadata.h>
50
51const struct ip_tunnel_encap_ops __rcu *
52 iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
53EXPORT_SYMBOL(iptun_encaps);
54
55const struct ip6_tnl_encap_ops __rcu *
56 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
57EXPORT_SYMBOL(ip6tun_encaps);
58
59void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
60 __be32 src, __be32 dst, __u8 proto,
61 __u8 tos, __u8 ttl, __be16 df, bool xnet)
62{
63 int pkt_len = skb->len - skb_inner_network_offset(skb);
64 struct net *net = dev_net(rt->dst.dev);
65 struct net_device *dev = skb->dev;
66 struct iphdr *iph;
67 int err;
68
69 skb_scrub_packet(skb, xnet);
70
71 skb_clear_hash_if_not_l4(skb);
72 skb_dst_set(skb, &rt->dst);
73 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
74
75
76 skb_push(skb, sizeof(struct iphdr));
77 skb_reset_network_header(skb);
78
79 iph = ip_hdr(skb);
80
81 iph->version = 4;
82 iph->ihl = sizeof(struct iphdr) >> 2;
83 iph->frag_off = df;
84 iph->protocol = proto;
85 iph->tos = tos;
86 iph->daddr = dst;
87 iph->saddr = src;
88 iph->ttl = ttl;
89 __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
90
91 err = ip_local_out(net, sk, skb);
92 if (unlikely(net_xmit_eval(err)))
93 pkt_len = 0;
94 iptunnel_xmit_stats(dev, pkt_len);
95}
96EXPORT_SYMBOL_GPL(iptunnel_xmit);
97
98int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
99 __be16 inner_proto, bool raw_proto, bool xnet)
100{
101 if (unlikely(!pskb_may_pull(skb, hdr_len)))
102 return -ENOMEM;
103
104 skb_pull_rcsum(skb, hdr_len);
105
106 if (!raw_proto && inner_proto == htons(ETH_P_TEB)) {
107 struct ethhdr *eh;
108
109 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
110 return -ENOMEM;
111
112 eh = (struct ethhdr *)skb->data;
113 if (likely(eth_proto_is_802_3(eh->h_proto)))
114 skb->protocol = eh->h_proto;
115 else
116 skb->protocol = htons(ETH_P_802_2);
117
118 } else {
119 skb->protocol = inner_proto;
120 }
121
122 skb_clear_hash_if_not_l4(skb);
123 skb->vlan_tci = 0;
124 skb_set_queue_mapping(skb, 0);
125 skb_scrub_packet(skb, xnet);
126
127 return iptunnel_pull_offloads(skb);
128}
129EXPORT_SYMBOL_GPL(__iptunnel_pull_header);
130
131struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
132 gfp_t flags)
133{
134 struct metadata_dst *res;
135 struct ip_tunnel_info *dst, *src;
136
137 if (!md || md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
138 return NULL;
139
140 res = metadata_dst_alloc(0, flags);
141 if (!res)
142 return NULL;
143
144 dst = &res->u.tun_info;
145 src = &md->u.tun_info;
146 dst->key.tun_id = src->key.tun_id;
147 if (src->mode & IP_TUNNEL_INFO_IPV6)
148 memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
149 sizeof(struct in6_addr));
150 else
151 dst->key.u.ipv4.dst = src->key.u.ipv4.src;
152 dst->mode = src->mode | IP_TUNNEL_INFO_TX;
153
154 return res;
155}
156EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
157
158int iptunnel_handle_offloads(struct sk_buff *skb,
159 int gso_type_mask)
160{
161 int err;
162
163 if (likely(!skb->encapsulation)) {
164 skb_reset_inner_headers(skb);
165 skb->encapsulation = 1;
166 }
167
168 if (skb_is_gso(skb)) {
169 err = skb_header_unclone(skb, GFP_ATOMIC);
170 if (unlikely(err))
171 return err;
172 skb_shinfo(skb)->gso_type |= gso_type_mask;
173 return 0;
174 }
175
176 if (skb->ip_summed != CHECKSUM_PARTIAL) {
177 skb->ip_summed = CHECKSUM_NONE;
178
179
180
181
182
183 skb->encapsulation = 0;
184 }
185
186 return 0;
187}
188EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
189
190
191struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
192 struct rtnl_link_stats64 *tot)
193{
194 int i;
195
196 netdev_stats_to_stats64(tot, &dev->stats);
197
198 for_each_possible_cpu(i) {
199 const struct pcpu_sw_netstats *tstats =
200 per_cpu_ptr(dev->tstats, i);
201 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
202 unsigned int start;
203
204 do {
205 start = u64_stats_fetch_begin_irq(&tstats->syncp);
206 rx_packets = tstats->rx_packets;
207 tx_packets = tstats->tx_packets;
208 rx_bytes = tstats->rx_bytes;
209 tx_bytes = tstats->tx_bytes;
210 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
211
212 tot->rx_packets += rx_packets;
213 tot->tx_packets += tx_packets;
214 tot->rx_bytes += rx_bytes;
215 tot->tx_bytes += tx_bytes;
216 }
217
218 return tot;
219}
220EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
221
222static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
223 [LWTUNNEL_IP_ID] = { .type = NLA_U64 },
224 [LWTUNNEL_IP_DST] = { .type = NLA_U32 },
225 [LWTUNNEL_IP_SRC] = { .type = NLA_U32 },
226 [LWTUNNEL_IP_TTL] = { .type = NLA_U8 },
227 [LWTUNNEL_IP_TOS] = { .type = NLA_U8 },
228 [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
229};
230
231static int ip_tun_build_state(struct net_device *dev, struct nlattr *attr,
232 unsigned int family, const void *cfg,
233 struct lwtunnel_state **ts)
234{
235 struct ip_tunnel_info *tun_info;
236 struct lwtunnel_state *new_state;
237 struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
238 int err;
239
240 err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy);
241 if (err < 0)
242 return err;
243
244 new_state = lwtunnel_state_alloc(sizeof(*tun_info));
245 if (!new_state)
246 return -ENOMEM;
247
248 new_state->type = LWTUNNEL_ENCAP_IP;
249
250 tun_info = lwt_tun_info(new_state);
251
252 if (tb[LWTUNNEL_IP_ID])
253 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
254
255 if (tb[LWTUNNEL_IP_DST])
256 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
257
258 if (tb[LWTUNNEL_IP_SRC])
259 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
260
261 if (tb[LWTUNNEL_IP_TTL])
262 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
263
264 if (tb[LWTUNNEL_IP_TOS])
265 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
266
267 if (tb[LWTUNNEL_IP_FLAGS])
268 tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP_FLAGS]);
269
270 tun_info->mode = IP_TUNNEL_INFO_TX;
271 tun_info->options_len = 0;
272
273 *ts = new_state;
274
275 return 0;
276}
277
278static int ip_tun_fill_encap_info(struct sk_buff *skb,
279 struct lwtunnel_state *lwtstate)
280{
281 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
282
283 if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
284 LWTUNNEL_IP_PAD) ||
285 nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
286 nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
287 nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
288 nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
289 nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags))
290 return -ENOMEM;
291
292 return 0;
293}
294
295static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
296{
297 return nla_total_size_64bit(8)
298 + nla_total_size(4)
299 + nla_total_size(4)
300 + nla_total_size(1)
301 + nla_total_size(1)
302 + nla_total_size(2);
303}
304
305static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
306{
307 return memcmp(lwt_tun_info(a), lwt_tun_info(b),
308 sizeof(struct ip_tunnel_info));
309}
310
311static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
312 .build_state = ip_tun_build_state,
313 .fill_encap = ip_tun_fill_encap_info,
314 .get_encap_size = ip_tun_encap_nlsize,
315 .cmp_encap = ip_tun_cmp_encap,
316};
317
318static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
319 [LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
320 [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
321 [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
322 [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
323 [LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
324 [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
325};
326
327static int ip6_tun_build_state(struct net_device *dev, struct nlattr *attr,
328 unsigned int family, const void *cfg,
329 struct lwtunnel_state **ts)
330{
331 struct ip_tunnel_info *tun_info;
332 struct lwtunnel_state *new_state;
333 struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
334 int err;
335
336 err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy);
337 if (err < 0)
338 return err;
339
340 new_state = lwtunnel_state_alloc(sizeof(*tun_info));
341 if (!new_state)
342 return -ENOMEM;
343
344 new_state->type = LWTUNNEL_ENCAP_IP6;
345
346 tun_info = lwt_tun_info(new_state);
347
348 if (tb[LWTUNNEL_IP6_ID])
349 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
350
351 if (tb[LWTUNNEL_IP6_DST])
352 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
353
354 if (tb[LWTUNNEL_IP6_SRC])
355 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
356
357 if (tb[LWTUNNEL_IP6_HOPLIMIT])
358 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
359
360 if (tb[LWTUNNEL_IP6_TC])
361 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
362
363 if (tb[LWTUNNEL_IP6_FLAGS])
364 tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
365
366 tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
367 tun_info->options_len = 0;
368
369 *ts = new_state;
370
371 return 0;
372}
373
374static int ip6_tun_fill_encap_info(struct sk_buff *skb,
375 struct lwtunnel_state *lwtstate)
376{
377 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
378
379 if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
380 LWTUNNEL_IP6_PAD) ||
381 nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
382 nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
383 nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
384 nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
385 nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags))
386 return -ENOMEM;
387
388 return 0;
389}
390
391static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
392{
393 return nla_total_size_64bit(8)
394 + nla_total_size(16)
395 + nla_total_size(16)
396 + nla_total_size(1)
397 + nla_total_size(1)
398 + nla_total_size(2);
399}
400
401static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
402 .build_state = ip6_tun_build_state,
403 .fill_encap = ip6_tun_fill_encap_info,
404 .get_encap_size = ip6_tun_encap_nlsize,
405 .cmp_encap = ip_tun_cmp_encap,
406};
407
408void __init ip_tunnel_core_init(void)
409{
410
411
412
413
414 BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
415
416 lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
417 lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
418}
419
420struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE;
421EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
422
423void ip_tunnel_need_metadata(void)
424{
425 static_key_slow_inc(&ip_tunnel_metadata_cnt);
426}
427EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
428
429void ip_tunnel_unneed_metadata(void)
430{
431 static_key_slow_dec(&ip_tunnel_metadata_cnt);
432}
433EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
434
