Commit | Line | Data |
---|---|---|
0e6fbc5b PS |
1 | /* |
2 | * Copyright (c) 2013 Nicira, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
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> | |
0e6fbc5b PS |
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> | |
e7030878 | 34 | #include <linux/static_key.h> |
0e6fbc5b PS |
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> | |
63d008a4 | 48 | #include <net/dst_metadata.h> |
0e6fbc5b | 49 | |
039f5062 PS |
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) | |
0e6fbc5b | 53 | { |
bc22a0e2 | 54 | int pkt_len = skb->len - skb_inner_network_offset(skb); |
f859b0f6 | 55 | struct net *net = dev_net(rt->dst.dev); |
039f5062 | 56 | struct net_device *dev = skb->dev; |
0e6fbc5b PS |
57 | struct iphdr *iph; |
58 | int err; | |
59 | ||
963a88b3 ND |
60 | skb_scrub_packet(skb, xnet); |
61 | ||
7539fadc | 62 | skb_clear_hash(skb); |
0e6fbc5b PS |
63 | skb_dst_set(skb, &rt->dst); |
64 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
65 | ||
66 | /* Push down and install the IP header. */ | |
78a3694d | 67 | skb_push(skb, sizeof(struct iphdr)); |
0e6fbc5b PS |
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; | |
f859b0f6 | 80 | __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1); |
0e6fbc5b | 81 | |
33224b16 | 82 | err = ip_local_out(net, sk, skb); |
0e6fbc5b PS |
83 | if (unlikely(net_xmit_eval(err))) |
84 | pkt_len = 0; | |
039f5062 | 85 | iptunnel_xmit_stats(dev, pkt_len); |
0e6fbc5b PS |
86 | } |
87 | EXPORT_SYMBOL_GPL(iptunnel_xmit); | |
3d7b46cd | 88 | |
7f290c94 JB |
89 | int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto, |
90 | bool xnet) | |
3d7b46cd PS |
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)) { | |
1245dfc8 | 98 | struct ethhdr *eh; |
3d7b46cd PS |
99 | |
100 | if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) | |
101 | return -ENOMEM; | |
102 | ||
1245dfc8 | 103 | eh = (struct ethhdr *)skb->data; |
d181ddca | 104 | if (likely(eth_proto_is_802_3(eh->h_proto))) |
3d7b46cd PS |
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 | ||
7539fadc | 113 | skb_clear_hash_if_not_l4(skb); |
3d7b46cd PS |
114 | skb->vlan_tci = 0; |
115 | skb_set_queue_mapping(skb, 0); | |
7f290c94 | 116 | skb_scrub_packet(skb, xnet); |
a09a4c8d JG |
117 | |
118 | return iptunnel_pull_offloads(skb); | |
3d7b46cd PS |
119 | } |
120 | EXPORT_SYMBOL_GPL(iptunnel_pull_header); | |
2d26f0a3 | 121 | |
63d008a4 JB |
122 | struct 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 | } | |
147 | EXPORT_SYMBOL_GPL(iptunnel_metadata_reply); | |
148 | ||
2d26f0a3 | 149 | struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, |
2d26f0a3 ED |
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 | ||
6fa79666 | 167 | if (skb->ip_summed != CHECKSUM_PARTIAL) { |
2d26f0a3 | 168 | skb->ip_summed = CHECKSUM_NONE; |
6fa79666 EC |
169 | /* We clear encapsulation here to prevent badly-written |
170 | * drivers potentially deciding to offload an inner checksum | |
171 | * if we set CHECKSUM_PARTIAL on the outer header. | |
172 | * This should go away when the drivers are all fixed. | |
173 | */ | |
179bc67f EC |
174 | skb->encapsulation = 0; |
175 | } | |
2d26f0a3 ED |
176 | |
177 | return skb; | |
178 | error: | |
179 | kfree_skb(skb); | |
180 | return ERR_PTR(err); | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(iptunnel_handle_offloads); | |
ebe44f35 DM |
183 | |
184 | /* Often modified stats are per cpu, other are shared (netdev->stats) */ | |
185 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, | |
186 | struct rtnl_link_stats64 *tot) | |
187 | { | |
188 | int i; | |
189 | ||
c24a5964 AD |
190 | netdev_stats_to_stats64(tot, &dev->stats); |
191 | ||
ebe44f35 DM |
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 { | |
57a7744e | 199 | start = u64_stats_fetch_begin_irq(&tstats->syncp); |
ebe44f35 DM |
200 | rx_packets = tstats->rx_packets; |
201 | tx_packets = tstats->tx_packets; | |
202 | rx_bytes = tstats->rx_bytes; | |
203 | tx_bytes = tstats->tx_bytes; | |
57a7744e | 204 | } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
ebe44f35 DM |
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 | ||
ebe44f35 DM |
212 | return tot; |
213 | } | |
214 | EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64); | |
3093fbe7 | 215 | |
a1c234f9 JB |
216 | static 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 }, | |
a1c234f9 | 222 | [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 }, |
3093fbe7 TG |
223 | }; |
224 | ||
225 | static int ip_tun_build_state(struct net_device *dev, struct nlattr *attr, | |
127eb7cd | 226 | unsigned int family, const void *cfg, |
3093fbe7 TG |
227 | struct lwtunnel_state **ts) |
228 | { | |
229 | struct ip_tunnel_info *tun_info; | |
230 | struct lwtunnel_state *new_state; | |
a1c234f9 | 231 | struct nlattr *tb[LWTUNNEL_IP_MAX + 1]; |
3093fbe7 TG |
232 | int err; |
233 | ||
a1c234f9 | 234 | err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy); |
3093fbe7 TG |
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 | ||
a1c234f9 | 246 | if (tb[LWTUNNEL_IP_ID]) |
30d3d83a | 247 | tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]); |
3093fbe7 | 248 | |
a1c234f9 | 249 | if (tb[LWTUNNEL_IP_DST]) |
c1ea5d67 | 250 | tun_info->key.u.ipv4.dst = nla_get_be32(tb[LWTUNNEL_IP_DST]); |
3093fbe7 | 251 | |
a1c234f9 | 252 | if (tb[LWTUNNEL_IP_SRC]) |
c1ea5d67 | 253 | tun_info->key.u.ipv4.src = nla_get_be32(tb[LWTUNNEL_IP_SRC]); |
3093fbe7 | 254 | |
a1c234f9 | 255 | if (tb[LWTUNNEL_IP_TTL]) |
7c383fb2 | 256 | tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]); |
3093fbe7 | 257 | |
a1c234f9 | 258 | if (tb[LWTUNNEL_IP_TOS]) |
7c383fb2 | 259 | tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]); |
3093fbe7 | 260 | |
a1c234f9 | 261 | if (tb[LWTUNNEL_IP_FLAGS]) |
30d3d83a | 262 | tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP_FLAGS]); |
3093fbe7 TG |
263 | |
264 | tun_info->mode = IP_TUNNEL_INFO_TX; | |
3093fbe7 TG |
265 | tun_info->options_len = 0; |
266 | ||
267 | *ts = new_state; | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static 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 | ||
30d3d83a | 277 | if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id) || |
c1ea5d67 JB |
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) || | |
7c383fb2 JB |
280 | nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) || |
281 | nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) || | |
30d3d83a | 282 | nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags)) |
3093fbe7 TG |
283 | return -ENOMEM; |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate) | |
289 | { | |
a1c234f9 JB |
290 | return nla_total_size(8) /* LWTUNNEL_IP_ID */ |
291 | + nla_total_size(4) /* LWTUNNEL_IP_DST */ | |
292 | + nla_total_size(4) /* LWTUNNEL_IP_SRC */ | |
293 | + nla_total_size(1) /* LWTUNNEL_IP_TOS */ | |
294 | + nla_total_size(1) /* LWTUNNEL_IP_TTL */ | |
a1c234f9 | 295 | + nla_total_size(2); /* LWTUNNEL_IP_FLAGS */ |
3093fbe7 TG |
296 | } |
297 | ||
2d798499 JB |
298 | static 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 | ||
3093fbe7 TG |
304 | static 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, | |
2d798499 | 308 | .cmp_encap = ip_tun_cmp_encap, |
3093fbe7 TG |
309 | }; |
310 | ||
32a2b002 JB |
311 | static 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 }, | |
32a2b002 JB |
317 | [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 }, |
318 | }; | |
319 | ||
320 | static int ip6_tun_build_state(struct net_device *dev, struct nlattr *attr, | |
127eb7cd | 321 | unsigned int family, const void *cfg, |
32a2b002 JB |
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]) | |
30d3d83a | 342 | tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]); |
32a2b002 JB |
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 | ||
32a2b002 | 356 | if (tb[LWTUNNEL_IP6_FLAGS]) |
30d3d83a | 357 | tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]); |
32a2b002 | 358 | |
7f9562a1 | 359 | tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6; |
32a2b002 JB |
360 | tun_info->options_len = 0; |
361 | ||
362 | *ts = new_state; | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | static 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 | ||
30d3d83a | 372 | if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id) || |
32a2b002 JB |
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) || | |
995096a0 QA |
375 | nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) || |
376 | nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) || | |
30d3d83a | 377 | nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags)) |
32a2b002 JB |
378 | return -ENOMEM; |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate) | |
384 | { | |
385 | return nla_total_size(8) /* LWTUNNEL_IP6_ID */ | |
386 | + nla_total_size(16) /* LWTUNNEL_IP6_DST */ | |
387 | + nla_total_size(16) /* LWTUNNEL_IP6_SRC */ | |
388 | + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */ | |
389 | + nla_total_size(1) /* LWTUNNEL_IP6_TC */ | |
32a2b002 JB |
390 | + nla_total_size(2); /* LWTUNNEL_IP6_FLAGS */ |
391 | } | |
392 | ||
393 | static 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 | ||
045a0fa0 | 400 | void __init ip_tunnel_core_init(void) |
3093fbe7 | 401 | { |
fca5fdf6 DB |
402 | /* If you land here, make sure whether increasing ip_tunnel_info's |
403 | * options_len is a reasonable choice with its usage in front ends | |
404 | * (f.e., it's part of flow keys, etc). | |
405 | */ | |
406 | BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255); | |
407 | ||
3093fbe7 | 408 | lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP); |
32a2b002 | 409 | lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6); |
3093fbe7 | 410 | } |
e7030878 TG |
411 | |
412 | struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE; | |
413 | EXPORT_SYMBOL(ip_tunnel_metadata_cnt); | |
414 | ||
415 | void ip_tunnel_need_metadata(void) | |
416 | { | |
417 | static_key_slow_inc(&ip_tunnel_metadata_cnt); | |
418 | } | |
419 | EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata); | |
420 | ||
421 | void ip_tunnel_unneed_metadata(void) | |
422 | { | |
423 | static_key_slow_dec(&ip_tunnel_metadata_cnt); | |
424 | } | |
425 | EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata); |