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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->type != METADATA_IP_TUNNEL ||
138 md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
139
140 return NULL;
141
142 res = metadata_dst_alloc(0, METADATA_IP_TUNNEL, flags);
143 if (!res)
144 return NULL;
145
146 dst = &res->u.tun_info;
147 src = &md->u.tun_info;
148 dst->key.tun_id = src->key.tun_id;
149 if (src->mode & IP_TUNNEL_INFO_IPV6)
150 memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
151 sizeof(struct in6_addr));
152 else
153 dst->key.u.ipv4.dst = src->key.u.ipv4.src;
154 dst->mode = src->mode | IP_TUNNEL_INFO_TX;
155
156 return res;
157}
158EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
159
160int iptunnel_handle_offloads(struct sk_buff *skb,
161 int gso_type_mask)
162{
163 int err;
164
165 if (likely(!skb->encapsulation)) {
166 skb_reset_inner_headers(skb);
167 skb->encapsulation = 1;
168 }
169
170 if (skb_is_gso(skb)) {
171 err = skb_header_unclone(skb, GFP_ATOMIC);
172 if (unlikely(err))
173 return err;
174 skb_shinfo(skb)->gso_type |= gso_type_mask;
175 return 0;
176 }
177
178 if (skb->ip_summed != CHECKSUM_PARTIAL) {
179 skb->ip_summed = CHECKSUM_NONE;
180
181
182
183
184
185 skb->encapsulation = 0;
186 }
187
188 return 0;
189}
190EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
191
192
193void ip_tunnel_get_stats64(struct net_device *dev,
194 struct rtnl_link_stats64 *tot)
195{
196 int i;
197
198 netdev_stats_to_stats64(tot, &dev->stats);
199
200 for_each_possible_cpu(i) {
201 const struct pcpu_sw_netstats *tstats =
202 per_cpu_ptr(dev->tstats, i);
203 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
204 unsigned int start;
205
206 do {
207 start = u64_stats_fetch_begin_irq(&tstats->syncp);
208 rx_packets = tstats->rx_packets;
209 tx_packets = tstats->tx_packets;
210 rx_bytes = tstats->rx_bytes;
211 tx_bytes = tstats->tx_bytes;
212 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
213
214 tot->rx_packets += rx_packets;
215 tot->tx_packets += tx_packets;
216 tot->rx_bytes += rx_bytes;
217 tot->tx_bytes += tx_bytes;
218 }
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 nlattr *attr,
232 unsigned int family, const void *cfg,
233 struct lwtunnel_state **ts,
234 struct netlink_ext_ack *extack)
235{
236 struct ip_tunnel_info *tun_info;
237 struct lwtunnel_state *new_state;
238 struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
239 int err;
240
241 err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy,
242 extack);
243 if (err < 0)
244 return err;
245
246 new_state = lwtunnel_state_alloc(sizeof(*tun_info));
247 if (!new_state)
248 return -ENOMEM;
249
250 new_state->type = LWTUNNEL_ENCAP_IP;
251
252 tun_info = lwt_tun_info(new_state);
253
254 if (tb[LWTUNNEL_IP_ID])
255 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
256
257 if (tb[LWTUNNEL_IP_DST])
258 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
259
260 if (tb[LWTUNNEL_IP_SRC])
261 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
262
263 if (tb[LWTUNNEL_IP_TTL])
264 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
265
266 if (tb[LWTUNNEL_IP_TOS])
267 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
268
269 if (tb[LWTUNNEL_IP_FLAGS])
270 tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP_FLAGS]);
271
272 tun_info->mode = IP_TUNNEL_INFO_TX;
273 tun_info->options_len = 0;
274
275 *ts = new_state;
276
277 return 0;
278}
279
280static int ip_tun_fill_encap_info(struct sk_buff *skb,
281 struct lwtunnel_state *lwtstate)
282{
283 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
284
285 if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
286 LWTUNNEL_IP_PAD) ||
287 nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
288 nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
289 nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
290 nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
291 nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags))
292 return -ENOMEM;
293
294 return 0;
295}
296
297static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
298{
299 return nla_total_size_64bit(8)
300 + nla_total_size(4)
301 + nla_total_size(4)
302 + nla_total_size(1)
303 + nla_total_size(1)
304 + nla_total_size(2);
305}
306
307static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
308{
309 return memcmp(lwt_tun_info(a), lwt_tun_info(b),
310 sizeof(struct ip_tunnel_info));
311}
312
313static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
314 .build_state = ip_tun_build_state,
315 .fill_encap = ip_tun_fill_encap_info,
316 .get_encap_size = ip_tun_encap_nlsize,
317 .cmp_encap = ip_tun_cmp_encap,
318 .owner = THIS_MODULE,
319};
320
321static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
322 [LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
323 [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
324 [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
325 [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
326 [LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
327 [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
328};
329
330static int ip6_tun_build_state(struct nlattr *attr,
331 unsigned int family, const void *cfg,
332 struct lwtunnel_state **ts,
333 struct netlink_ext_ack *extack)
334{
335 struct ip_tunnel_info *tun_info;
336 struct lwtunnel_state *new_state;
337 struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
338 int err;
339
340 err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy,
341 extack);
342 if (err < 0)
343 return err;
344
345 new_state = lwtunnel_state_alloc(sizeof(*tun_info));
346 if (!new_state)
347 return -ENOMEM;
348
349 new_state->type = LWTUNNEL_ENCAP_IP6;
350
351 tun_info = lwt_tun_info(new_state);
352
353 if (tb[LWTUNNEL_IP6_ID])
354 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
355
356 if (tb[LWTUNNEL_IP6_DST])
357 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
358
359 if (tb[LWTUNNEL_IP6_SRC])
360 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
361
362 if (tb[LWTUNNEL_IP6_HOPLIMIT])
363 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
364
365 if (tb[LWTUNNEL_IP6_TC])
366 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
367
368 if (tb[LWTUNNEL_IP6_FLAGS])
369 tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
370
371 tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
372 tun_info->options_len = 0;
373
374 *ts = new_state;
375
376 return 0;
377}
378
379static int ip6_tun_fill_encap_info(struct sk_buff *skb,
380 struct lwtunnel_state *lwtstate)
381{
382 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
383
384 if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
385 LWTUNNEL_IP6_PAD) ||
386 nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
387 nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
388 nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
389 nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
390 nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags))
391 return -ENOMEM;
392
393 return 0;
394}
395
396static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
397{
398 return nla_total_size_64bit(8)
399 + nla_total_size(16)
400 + nla_total_size(16)
401 + nla_total_size(1)
402 + nla_total_size(1)
403 + nla_total_size(2);
404}
405
406static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
407 .build_state = ip6_tun_build_state,
408 .fill_encap = ip6_tun_fill_encap_info,
409 .get_encap_size = ip6_tun_encap_nlsize,
410 .cmp_encap = ip_tun_cmp_encap,
411 .owner = THIS_MODULE,
412};
413
414void __init ip_tunnel_core_init(void)
415{
416
417
418
419
420 BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
421
422 lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
423 lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
424}
425
426struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE;
427EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
428
429void ip_tunnel_need_metadata(void)
430{
431 static_key_slow_inc(&ip_tunnel_metadata_cnt);
432}
433EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
434
435void ip_tunnel_unneed_metadata(void)
436{
437 static_key_slow_dec(&ip_tunnel_metadata_cnt);
438}
439EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
440
