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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/arp.h>
41#include <net/checksum.h>
42#include <net/dsfield.h>
43#include <net/inet_ecn.h>
44#include <net/xfrm.h>
45#include <net/net_namespace.h>
46#include <net/netns/generic.h>
47#include <net/rtnetlink.h>
48#include <net/dst_metadata.h>
49
50void 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(skb);
63 skb_dst_set(skb, &rt->dst);
64 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
65
66
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 = 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 if (unlikely(net_xmit_eval(err)))
84 pkt_len = 0;
85 iptunnel_xmit_stats(dev, pkt_len);
86}
87EXPORT_SYMBOL_GPL(iptunnel_xmit);
88
89int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto,
90 bool xnet)
91{
92 if (unlikely(!pskb_may_pull(skb, hdr_len)))
93 return -ENOMEM;
94
95 skb_pull_rcsum(skb, hdr_len);
96
97 if (inner_proto == htons(ETH_P_TEB)) {
98 struct ethhdr *eh;
99
100 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
101 return -ENOMEM;
102
103 eh = (struct ethhdr *)skb->data;
104 if (likely(eth_proto_is_802_3(eh->h_proto)))
105 skb->protocol = eh->h_proto;
106 else
107 skb->protocol = htons(ETH_P_802_2);
108
109 } else {
110 skb->protocol = inner_proto;
111 }
112
113 skb_clear_hash_if_not_l4(skb);
114 skb->vlan_tci = 0;
115 skb_set_queue_mapping(skb, 0);
116 skb_scrub_packet(skb, xnet);
117
118 return iptunnel_pull_offloads(skb);
119}
120EXPORT_SYMBOL_GPL(iptunnel_pull_header);
121
122struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
123 gfp_t flags)
124{
125 struct metadata_dst *res;
126 struct ip_tunnel_info *dst, *src;
127
128 if (!md || md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
129 return NULL;
130
131 res = metadata_dst_alloc(0, flags);
132 if (!res)
133 return NULL;
134
135 dst = &res->u.tun_info;
136 src = &md->u.tun_info;
137 dst->key.tun_id = src->key.tun_id;
138 if (src->mode & IP_TUNNEL_INFO_IPV6)
139 memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
140 sizeof(struct in6_addr));
141 else
142 dst->key.u.ipv4.dst = src->key.u.ipv4.src;
143 dst->mode = src->mode | IP_TUNNEL_INFO_TX;
144
145 return res;
146}
147EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
148
149struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb,
150 int gso_type_mask)
151{
152 int err;
153
154 if (likely(!skb->encapsulation)) {
155 skb_reset_inner_headers(skb);
156 skb->encapsulation = 1;
157 }
158
159 if (skb_is_gso(skb)) {
160 err = skb_unclone(skb, GFP_ATOMIC);
161 if (unlikely(err))
162 goto error;
163 skb_shinfo(skb)->gso_type |= gso_type_mask;
164 return skb;
165 }
166
167 if (skb->ip_summed != CHECKSUM_PARTIAL) {
168 skb->ip_summed = CHECKSUM_NONE;
169
170
171
172
173
174 skb->encapsulation = 0;
175 }
176
177 return skb;
178error:
179 kfree_skb(skb);
180 return ERR_PTR(err);
181}
182EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
183
184
185struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
186 struct rtnl_link_stats64 *tot)
187{
188 int i;
189
190 netdev_stats_to_stats64(tot, &dev->stats);
191
192 for_each_possible_cpu(i) {
193 const struct pcpu_sw_netstats *tstats =
194 per_cpu_ptr(dev->tstats, i);
195 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
196 unsigned int start;
197
198 do {
199 start = u64_stats_fetch_begin_irq(&tstats->syncp);
200 rx_packets = tstats->rx_packets;
201 tx_packets = tstats->tx_packets;
202 rx_bytes = tstats->rx_bytes;
203 tx_bytes = tstats->tx_bytes;
204 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
205
206 tot->rx_packets += rx_packets;
207 tot->tx_packets += tx_packets;
208 tot->rx_bytes += rx_bytes;
209 tot->tx_bytes += tx_bytes;
210 }
211
212 return tot;
213}
214EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
215
216static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
217 [LWTUNNEL_IP_ID] = { .type = NLA_U64 },
218 [LWTUNNEL_IP_DST] = { .type = NLA_U32 },
219 [LWTUNNEL_IP_SRC] = { .type = NLA_U32 },
220 [LWTUNNEL_IP_TTL] = { .type = NLA_U8 },
221 [LWTUNNEL_IP_TOS] = { .type = NLA_U8 },
222 [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
223};
224
225static int ip_tun_build_state(struct net_device *dev, struct nlattr *attr,
226 unsigned int family, const void *cfg,
227 struct lwtunnel_state **ts)
228{
229 struct ip_tunnel_info *tun_info;
230 struct lwtunnel_state *new_state;
231 struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
232 int err;
233
234 err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy);
235 if (err < 0)
236 return err;
237
238 new_state = lwtunnel_state_alloc(sizeof(*tun_info));
239 if (!new_state)
240 return -ENOMEM;
241
242 new_state->type = LWTUNNEL_ENCAP_IP;
243
244 tun_info = lwt_tun_info(new_state);
245
246 if (tb[LWTUNNEL_IP_ID])
247 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
248
249 if (tb[LWTUNNEL_IP_DST])
250 tun_info->key.u.ipv4.dst = nla_get_be32(tb[LWTUNNEL_IP_DST]);
251
252 if (tb[LWTUNNEL_IP_SRC])
253 tun_info->key.u.ipv4.src = nla_get_be32(tb[LWTUNNEL_IP_SRC]);
254
255 if (tb[LWTUNNEL_IP_TTL])
256 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
257
258 if (tb[LWTUNNEL_IP_TOS])
259 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
260
261 if (tb[LWTUNNEL_IP_FLAGS])
262 tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP_FLAGS]);
263
264 tun_info->mode = IP_TUNNEL_INFO_TX;
265 tun_info->options_len = 0;
266
267 *ts = new_state;
268
269 return 0;
270}
271
272static int ip_tun_fill_encap_info(struct sk_buff *skb,
273 struct lwtunnel_state *lwtstate)
274{
275 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
276
277 if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id) ||
278 nla_put_be32(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
279 nla_put_be32(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
280 nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
281 nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
282 nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags))
283 return -ENOMEM;
284
285 return 0;
286}
287
288static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
289{
290 return nla_total_size(8)
291 + nla_total_size(4)
292 + nla_total_size(4)
293 + nla_total_size(1)
294 + nla_total_size(1)
295 + nla_total_size(2);
296}
297
298static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
299{
300 return memcmp(lwt_tun_info(a), lwt_tun_info(b),
301 sizeof(struct ip_tunnel_info));
302}
303
304static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
305 .build_state = ip_tun_build_state,
306 .fill_encap = ip_tun_fill_encap_info,
307 .get_encap_size = ip_tun_encap_nlsize,
308 .cmp_encap = ip_tun_cmp_encap,
309};
310
311static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
312 [LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
313 [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
314 [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
315 [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
316 [LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
317 [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
318};
319
320static int ip6_tun_build_state(struct net_device *dev, struct nlattr *attr,
321 unsigned int family, const void *cfg,
322 struct lwtunnel_state **ts)
323{
324 struct ip_tunnel_info *tun_info;
325 struct lwtunnel_state *new_state;
326 struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
327 int err;
328
329 err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy);
330 if (err < 0)
331 return err;
332
333 new_state = lwtunnel_state_alloc(sizeof(*tun_info));
334 if (!new_state)
335 return -ENOMEM;
336
337 new_state->type = LWTUNNEL_ENCAP_IP6;
338
339 tun_info = lwt_tun_info(new_state);
340
341 if (tb[LWTUNNEL_IP6_ID])
342 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
343
344 if (tb[LWTUNNEL_IP6_DST])
345 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
346
347 if (tb[LWTUNNEL_IP6_SRC])
348 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
349
350 if (tb[LWTUNNEL_IP6_HOPLIMIT])
351 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
352
353 if (tb[LWTUNNEL_IP6_TC])
354 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
355
356 if (tb[LWTUNNEL_IP6_FLAGS])
357 tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
358
359 tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
360 tun_info->options_len = 0;
361
362 *ts = new_state;
363
364 return 0;
365}
366
367static int ip6_tun_fill_encap_info(struct sk_buff *skb,
368 struct lwtunnel_state *lwtstate)
369{
370 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
371
372 if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id) ||
373 nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
374 nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
375 nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
376 nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
377 nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags))
378 return -ENOMEM;
379
380 return 0;
381}
382
383static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
384{
385 return nla_total_size(8)
386 + nla_total_size(16)
387 + nla_total_size(16)
388 + nla_total_size(1)
389 + nla_total_size(1)
390 + nla_total_size(2);
391}
392
393static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
394 .build_state = ip6_tun_build_state,
395 .fill_encap = ip6_tun_fill_encap_info,
396 .get_encap_size = ip6_tun_encap_nlsize,
397 .cmp_encap = ip_tun_cmp_encap,
398};
399
400void __init ip_tunnel_core_init(void)
401{
402
403
404
405
406 BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
407
408 lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
409 lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
410}
411
412struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE;
413EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
414
415void ip_tunnel_need_metadata(void)
416{
417 static_key_slow_inc(&ip_tunnel_metadata_cnt);
418}
419EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
420
421void ip_tunnel_unneed_metadata(void)
422{
423 static_key_slow_dec(&ip_tunnel_metadata_cnt);
424}
425EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
426
