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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
e905a9ed | 3 | * Linux NET3: IP/IP protocol decoder. |
1da177e4 | 4 | * |
1da177e4 LT |
5 | * Authors: |
6 | * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 | |
7 | * | |
8 | * Fixes: | |
9 | * Alan Cox : Merged and made usable non modular (its so tiny its silly as | |
10 | * a module taking up 2 pages). | |
11 | * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph) | |
12 | * to keep ip_forward happy. | |
13 | * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8). | |
14 | * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL | |
15 | * David Woodhouse : Perform some basic ICMP handling. | |
16 | * IPIP Routing without decapsulation. | |
17 | * Carlos Picoto : GRE over IP support | |
18 | * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c. | |
19 | * I do not want to merge them together. | |
1da177e4 LT |
20 | */ |
21 | ||
22 | /* tunnel.c: an IP tunnel driver | |
23 | ||
24 | The purpose of this driver is to provide an IP tunnel through | |
25 | which you can tunnel network traffic transparently across subnets. | |
26 | ||
27 | This was written by looking at Nick Holloway's dummy driver | |
28 | Thanks for the great code! | |
29 | ||
30 | -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 | |
e905a9ed | 31 | |
1da177e4 LT |
32 | Minor tweaks: |
33 | Cleaned up the code a little and added some pre-1.3.0 tweaks. | |
34 | dev->hard_header/hard_header_len changed to use no headers. | |
35 | Comments/bracketing tweaked. | |
36 | Made the tunnels use dev->name not tunnel: when error reporting. | |
37 | Added tx_dropped stat | |
e905a9ed | 38 | |
113aa838 | 39 | -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95 |
1da177e4 LT |
40 | |
41 | Reworked: | |
42 | Changed to tunnel to destination gateway in addition to the | |
43 | tunnel's pointopoint address | |
44 | Almost completely rewritten | |
45 | Note: There is currently no firewall or ICMP handling done. | |
46 | ||
47 | -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96 | |
e905a9ed | 48 | |
1da177e4 LT |
49 | */ |
50 | ||
51 | /* Things I wish I had known when writing the tunnel driver: | |
52 | ||
53 | When the tunnel_xmit() function is called, the skb contains the | |
54 | packet to be sent (plus a great deal of extra info), and dev | |
55 | contains the tunnel device that _we_ are. | |
56 | ||
57 | When we are passed a packet, we are expected to fill in the | |
58 | source address with our source IP address. | |
59 | ||
60 | What is the proper way to allocate, copy and free a buffer? | |
61 | After you allocate it, it is a "0 length" chunk of memory | |
62 | starting at zero. If you want to add headers to the buffer | |
63 | later, you'll have to call "skb_reserve(skb, amount)" with | |
64 | the amount of memory you want reserved. Then, you call | |
65 | "skb_put(skb, amount)" with the amount of space you want in | |
66 | the buffer. skb_put() returns a pointer to the top (#0) of | |
67 | that buffer. skb->len is set to the amount of space you have | |
68 | "allocated" with skb_put(). You can then write up to skb->len | |
69 | bytes to that buffer. If you need more, you can call skb_put() | |
70 | again with the additional amount of space you need. You can | |
e905a9ed | 71 | find out how much more space you can allocate by calling |
1da177e4 LT |
72 | "skb_tailroom(skb)". |
73 | Now, to add header space, call "skb_push(skb, header_len)". | |
74 | This creates space at the beginning of the buffer and returns | |
75 | a pointer to this new space. If later you need to strip a | |
76 | header from a buffer, call "skb_pull(skb, header_len)". | |
77 | skb_headroom() will return how much space is left at the top | |
78 | of the buffer (before the main data). Remember, this headroom | |
79 | space must be reserved before the skb_put() function is called. | |
80 | */ | |
81 | ||
82 | /* | |
83 | This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c | |
84 | ||
85 | For comments look at net/ipv4/ip_gre.c --ANK | |
86 | */ | |
87 | ||
e905a9ed | 88 | |
4fc268d2 | 89 | #include <linux/capability.h> |
1da177e4 LT |
90 | #include <linux/module.h> |
91 | #include <linux/types.h> | |
1da177e4 | 92 | #include <linux/kernel.h> |
5a0e3ad6 | 93 | #include <linux/slab.h> |
7c0f6ba6 | 94 | #include <linux/uaccess.h> |
1da177e4 LT |
95 | #include <linux/skbuff.h> |
96 | #include <linux/netdevice.h> | |
97 | #include <linux/in.h> | |
98 | #include <linux/tcp.h> | |
99 | #include <linux/udp.h> | |
100 | #include <linux/if_arp.h> | |
1da177e4 LT |
101 | #include <linux/init.h> |
102 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 103 | #include <linux/if_ether.h> |
1da177e4 LT |
104 | |
105 | #include <net/sock.h> | |
106 | #include <net/ip.h> | |
107 | #include <net/icmp.h> | |
c5441932 | 108 | #include <net/ip_tunnels.h> |
1da177e4 LT |
109 | #include <net/inet_ecn.h> |
110 | #include <net/xfrm.h> | |
10dc4c7b PE |
111 | #include <net/net_namespace.h> |
112 | #include <net/netns/generic.h> | |
cfc7381b | 113 | #include <net/dst_metadata.h> |
1da177e4 | 114 | |
eccc1bb8 | 115 | static bool log_ecn_error = true; |
116 | module_param(log_ecn_error, bool, 0644); | |
117 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
118 | ||
c7d03a00 | 119 | static unsigned int ipip_net_id __read_mostly; |
10dc4c7b | 120 | |
3c97af99 | 121 | static int ipip_tunnel_init(struct net_device *dev); |
0974658d | 122 | static struct rtnl_link_ops ipip_link_ops __read_mostly; |
1da177e4 | 123 | |
d2acc347 | 124 | static int ipip_err(struct sk_buff *skb, u32 info) |
1da177e4 | 125 | { |
f3594f0a XL |
126 | /* All the routers (except for Linux) return only |
127 | * 8 bytes of packet payload. It means, that precise relaying of | |
128 | * ICMP in the real Internet is absolutely infeasible. | |
129 | */ | |
fd58156e PS |
130 | struct net *net = dev_net(skb->dev); |
131 | struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); | |
b71d1d42 | 132 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
fd58156e PS |
133 | const int type = icmp_hdr(skb)->type; |
134 | const int code = icmp_hdr(skb)->code; | |
f3594f0a XL |
135 | struct ip_tunnel *t; |
136 | int err = 0; | |
137 | ||
32bbd879 SB |
138 | t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, |
139 | iph->daddr, iph->saddr, 0); | |
140 | if (!t) { | |
141 | err = -ENOENT; | |
142 | goto out; | |
143 | } | |
144 | ||
f3594f0a XL |
145 | switch (type) { |
146 | case ICMP_DEST_UNREACH: | |
147 | switch (code) { | |
148 | case ICMP_SR_FAILED: | |
149 | /* Impossible event. */ | |
150 | goto out; | |
151 | default: | |
152 | /* All others are translated to HOST_UNREACH. | |
153 | * rfc2003 contains "deep thoughts" about NET_UNREACH, | |
154 | * I believe they are just ether pollution. --ANK | |
155 | */ | |
156 | break; | |
157 | } | |
158 | break; | |
159 | ||
160 | case ICMP_TIME_EXCEEDED: | |
161 | if (code != ICMP_EXC_TTL) | |
162 | goto out; | |
163 | break; | |
164 | ||
165 | case ICMP_REDIRECT: | |
166 | break; | |
167 | ||
168 | default: | |
169 | goto out; | |
170 | } | |
1da177e4 | 171 | |
36393395 | 172 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { |
d888f396 | 173 | ipv4_update_pmtu(skb, net, info, t->parms.link, iph->protocol); |
36393395 DM |
174 | goto out; |
175 | } | |
176 | ||
55be7a9c | 177 | if (type == ICMP_REDIRECT) { |
1042caa7 | 178 | ipv4_redirect(skb, net, t->parms.link, iph->protocol); |
55be7a9c DM |
179 | goto out; |
180 | } | |
181 | ||
f3594f0a XL |
182 | if (t->parms.iph.daddr == 0) { |
183 | err = -ENOENT; | |
1da177e4 | 184 | goto out; |
f3594f0a | 185 | } |
d2acc347 | 186 | |
1da177e4 LT |
187 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
188 | goto out; | |
189 | ||
26d94b46 | 190 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
191 | t->err_count++; |
192 | else | |
193 | t->err_count = 1; | |
194 | t->err_time = jiffies; | |
b0558ef2 | 195 | |
fd58156e | 196 | out: |
d2acc347 | 197 | return err; |
1da177e4 LT |
198 | } |
199 | ||
1b69e7e6 | 200 | static const struct tnl_ptk_info ipip_tpi = { |
fd58156e PS |
201 | /* no tunnel info required for ipip. */ |
202 | .proto = htons(ETH_P_IP), | |
203 | }; | |
204 | ||
1b69e7e6 SH |
205 | #if IS_ENABLED(CONFIG_MPLS) |
206 | static const struct tnl_ptk_info mplsip_tpi = { | |
207 | /* no tunnel info required for mplsip. */ | |
208 | .proto = htons(ETH_P_MPLS_UC), | |
209 | }; | |
210 | #endif | |
211 | ||
212 | static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto) | |
1da177e4 | 213 | { |
fd58156e PS |
214 | struct net *net = dev_net(skb->dev); |
215 | struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); | |
cfc7381b | 216 | struct metadata_dst *tun_dst = NULL; |
1da177e4 | 217 | struct ip_tunnel *tunnel; |
3d7b46cd | 218 | const struct iphdr *iph; |
3c97af99 | 219 | |
3d7b46cd | 220 | iph = ip_hdr(skb); |
fd58156e PS |
221 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, |
222 | iph->saddr, iph->daddr, 0); | |
223 | if (tunnel) { | |
1b69e7e6 SH |
224 | const struct tnl_ptk_info *tpi; |
225 | ||
226 | if (tunnel->parms.iph.protocol != ipproto && | |
227 | tunnel->parms.iph.protocol != 0) | |
228 | goto drop; | |
229 | ||
eccc1bb8 | 230 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
231 | goto drop; | |
1b69e7e6 SH |
232 | #if IS_ENABLED(CONFIG_MPLS) |
233 | if (ipproto == IPPROTO_MPLS) | |
234 | tpi = &mplsip_tpi; | |
235 | else | |
236 | #endif | |
237 | tpi = &ipip_tpi; | |
238 | if (iptunnel_pull_header(skb, 0, tpi->proto, false)) | |
737e828b | 239 | goto drop; |
cfc7381b AS |
240 | if (tunnel->collect_md) { |
241 | tun_dst = ip_tun_rx_dst(skb, 0, 0, 0); | |
242 | if (!tun_dst) | |
243 | return 0; | |
244 | } | |
7ad136fd GN |
245 | skb_reset_mac_header(skb); |
246 | ||
cfc7381b | 247 | return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); |
1da177e4 | 248 | } |
1da177e4 | 249 | |
1da177e4 | 250 | return -1; |
eccc1bb8 | 251 | |
252 | drop: | |
253 | kfree_skb(skb); | |
254 | return 0; | |
1da177e4 LT |
255 | } |
256 | ||
1b69e7e6 SH |
257 | static int ipip_rcv(struct sk_buff *skb) |
258 | { | |
259 | return ipip_tunnel_rcv(skb, IPPROTO_IPIP); | |
260 | } | |
261 | ||
262 | #if IS_ENABLED(CONFIG_MPLS) | |
263 | static int mplsip_rcv(struct sk_buff *skb) | |
264 | { | |
265 | return ipip_tunnel_rcv(skb, IPPROTO_MPLS); | |
266 | } | |
267 | #endif | |
268 | ||
1da177e4 LT |
269 | /* |
270 | * This function assumes it is being called from dev_queue_xmit() | |
271 | * and that skb is filled properly by that function. | |
272 | */ | |
1b69e7e6 SH |
273 | static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, |
274 | struct net_device *dev) | |
1da177e4 | 275 | { |
2941a486 | 276 | struct ip_tunnel *tunnel = netdev_priv(dev); |
b71d1d42 | 277 | const struct iphdr *tiph = &tunnel->parms.iph; |
1b69e7e6 SH |
278 | u8 ipproto; |
279 | ||
47d858d0 HY |
280 | if (!pskb_inet_may_pull(skb)) |
281 | goto tx_error; | |
282 | ||
1b69e7e6 SH |
283 | switch (skb->protocol) { |
284 | case htons(ETH_P_IP): | |
285 | ipproto = IPPROTO_IPIP; | |
286 | break; | |
287 | #if IS_ENABLED(CONFIG_MPLS) | |
288 | case htons(ETH_P_MPLS_UC): | |
289 | ipproto = IPPROTO_MPLS; | |
290 | break; | |
291 | #endif | |
292 | default: | |
293 | goto tx_error; | |
294 | } | |
1da177e4 | 295 | |
1b69e7e6 | 296 | if (tiph->protocol != ipproto && tiph->protocol != 0) |
1da177e4 | 297 | goto tx_error; |
1da177e4 | 298 | |
7e13318d | 299 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) |
aed069df | 300 | goto tx_error; |
8344bfc6 | 301 | |
1b69e7e6 | 302 | skb_set_inner_ipproto(skb, ipproto); |
077c5a09 | 303 | |
cfc7381b | 304 | if (tunnel->collect_md) |
c8b34e68 | 305 | ip_md_tunnel_xmit(skb, dev, ipproto, 0); |
cfc7381b AS |
306 | else |
307 | ip_tunnel_xmit(skb, dev, tiph, ipproto); | |
6ed10654 | 308 | return NETDEV_TX_OK; |
1da177e4 | 309 | |
1da177e4 | 310 | tx_error: |
3acfa1e7 | 311 | kfree_skb(skb); |
aed069df | 312 | |
cb32f511 | 313 | dev->stats.tx_errors++; |
6ed10654 | 314 | return NETDEV_TX_OK; |
1da177e4 LT |
315 | } |
316 | ||
1b69e7e6 SH |
317 | static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto) |
318 | { | |
319 | switch (ipproto) { | |
320 | case 0: | |
321 | case IPPROTO_IPIP: | |
322 | #if IS_ENABLED(CONFIG_MPLS) | |
323 | case IPPROTO_MPLS: | |
324 | #endif | |
325 | return true; | |
326 | } | |
327 | ||
328 | return false; | |
329 | } | |
330 | ||
1da177e4 | 331 | static int |
607259a6 | 332 | ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) |
1da177e4 | 333 | { |
3b7b514f | 334 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
607259a6 CH |
335 | if (p->iph.version != 4 || |
336 | !ipip_tunnel_ioctl_verify_protocol(p->iph.protocol) || | |
337 | p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) | |
3b7b514f CW |
338 | return -EINVAL; |
339 | } | |
340 | ||
607259a6 CH |
341 | p->i_key = p->o_key = 0; |
342 | p->i_flags = p->o_flags = 0; | |
343 | return ip_tunnel_ctl(dev, p, cmd); | |
1da177e4 LT |
344 | } |
345 | ||
23a12b14 | 346 | static const struct net_device_ops ipip_netdev_ops = { |
fd58156e PS |
347 | .ndo_init = ipip_tunnel_init, |
348 | .ndo_uninit = ip_tunnel_uninit, | |
23a12b14 | 349 | .ndo_start_xmit = ipip_tunnel_xmit, |
3e7a1c7c | 350 | .ndo_siocdevprivate = ip_tunnel_siocdevprivate, |
fd58156e | 351 | .ndo_change_mtu = ip_tunnel_change_mtu, |
98d7fc46 | 352 | .ndo_get_stats64 = dev_get_tstats64, |
1e99584b | 353 | .ndo_get_iflink = ip_tunnel_get_iflink, |
607259a6 | 354 | .ndo_tunnel_ctl = ipip_tunnel_ctl, |
23a12b14 SH |
355 | }; |
356 | ||
c3b89fbb ED |
357 | #define IPIP_FEATURES (NETIF_F_SG | \ |
358 | NETIF_F_FRAGLIST | \ | |
359 | NETIF_F_HIGHDMA | \ | |
cb32f511 | 360 | NETIF_F_GSO_SOFTWARE | \ |
c3b89fbb ED |
361 | NETIF_F_HW_CSUM) |
362 | ||
1da177e4 LT |
363 | static void ipip_tunnel_setup(struct net_device *dev) |
364 | { | |
23a12b14 | 365 | dev->netdev_ops = &ipip_netdev_ops; |
e53ac932 | 366 | dev->header_ops = &ip_tunnel_header_ops; |
1da177e4 LT |
367 | |
368 | dev->type = ARPHRD_TUNNEL; | |
1da177e4 | 369 | dev->flags = IFF_NOARP; |
1da177e4 | 370 | dev->addr_len = 4; |
153f0943 | 371 | dev->features |= NETIF_F_LLTX; |
02875878 | 372 | netif_keep_dst(dev); |
c3b89fbb ED |
373 | |
374 | dev->features |= IPIP_FEATURES; | |
375 | dev->hw_features |= IPIP_FEATURES; | |
fd58156e | 376 | ip_tunnel_setup(dev, ipip_net_id); |
1da177e4 LT |
377 | } |
378 | ||
3c97af99 | 379 | static int ipip_tunnel_init(struct net_device *dev) |
1da177e4 | 380 | { |
23a12b14 | 381 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 382 | |
1da177e4 LT |
383 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); |
384 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
385 | ||
473ab820 TH |
386 | tunnel->tun_hlen = 0; |
387 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; | |
fd58156e | 388 | return ip_tunnel_init(dev); |
1da177e4 LT |
389 | } |
390 | ||
a8b8a889 MS |
391 | static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
392 | struct netlink_ext_ack *extack) | |
1b69e7e6 SH |
393 | { |
394 | u8 proto; | |
395 | ||
396 | if (!data || !data[IFLA_IPTUN_PROTO]) | |
397 | return 0; | |
398 | ||
399 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
400 | if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0) | |
401 | return -EINVAL; | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
be42da0e | 406 | static void ipip_netlink_parms(struct nlattr *data[], |
9830ad4c CG |
407 | struct ip_tunnel_parm *parms, bool *collect_md, |
408 | __u32 *fwmark) | |
be42da0e ND |
409 | { |
410 | memset(parms, 0, sizeof(*parms)); | |
411 | ||
412 | parms->iph.version = 4; | |
413 | parms->iph.protocol = IPPROTO_IPIP; | |
414 | parms->iph.ihl = 5; | |
cfc7381b | 415 | *collect_md = false; |
be42da0e ND |
416 | |
417 | if (!data) | |
418 | return; | |
419 | ||
420 | if (data[IFLA_IPTUN_LINK]) | |
421 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
422 | ||
423 | if (data[IFLA_IPTUN_LOCAL]) | |
67b61f6c | 424 | parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]); |
be42da0e ND |
425 | |
426 | if (data[IFLA_IPTUN_REMOTE]) | |
67b61f6c | 427 | parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]); |
be42da0e ND |
428 | |
429 | if (data[IFLA_IPTUN_TTL]) { | |
430 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
431 | if (parms->iph.ttl) | |
432 | parms->iph.frag_off = htons(IP_DF); | |
433 | } | |
434 | ||
435 | if (data[IFLA_IPTUN_TOS]) | |
436 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
437 | ||
1b69e7e6 SH |
438 | if (data[IFLA_IPTUN_PROTO]) |
439 | parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
440 | ||
be42da0e ND |
441 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) |
442 | parms->iph.frag_off = htons(IP_DF); | |
cfc7381b AS |
443 | |
444 | if (data[IFLA_IPTUN_COLLECT_METADATA]) | |
445 | *collect_md = true; | |
9830ad4c CG |
446 | |
447 | if (data[IFLA_IPTUN_FWMARK]) | |
448 | *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); | |
be42da0e ND |
449 | } |
450 | ||
473ab820 TH |
451 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
452 | static bool ipip_netlink_encap_parms(struct nlattr *data[], | |
453 | struct ip_tunnel_encap *ipencap) | |
454 | { | |
455 | bool ret = false; | |
456 | ||
457 | memset(ipencap, 0, sizeof(*ipencap)); | |
458 | ||
459 | if (!data) | |
460 | return ret; | |
461 | ||
462 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { | |
463 | ret = true; | |
464 | ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); | |
465 | } | |
466 | ||
467 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { | |
468 | ret = true; | |
469 | ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); | |
470 | } | |
471 | ||
472 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { | |
473 | ret = true; | |
3e97fa70 | 474 | ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); |
473ab820 TH |
475 | } |
476 | ||
477 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { | |
478 | ret = true; | |
3e97fa70 | 479 | ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); |
473ab820 TH |
480 | } |
481 | ||
482 | return ret; | |
483 | } | |
484 | ||
be42da0e | 485 | static int ipip_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
486 | struct nlattr *tb[], struct nlattr *data[], |
487 | struct netlink_ext_ack *extack) | |
be42da0e | 488 | { |
cfc7381b | 489 | struct ip_tunnel *t = netdev_priv(dev); |
fd58156e | 490 | struct ip_tunnel_parm p; |
473ab820 | 491 | struct ip_tunnel_encap ipencap; |
9830ad4c | 492 | __u32 fwmark = 0; |
473ab820 TH |
493 | |
494 | if (ipip_netlink_encap_parms(data, &ipencap)) { | |
473ab820 TH |
495 | int err = ip_tunnel_encap_setup(t, &ipencap); |
496 | ||
497 | if (err < 0) | |
498 | return err; | |
499 | } | |
be42da0e | 500 | |
9830ad4c CG |
501 | ipip_netlink_parms(data, &p, &t->collect_md, &fwmark); |
502 | return ip_tunnel_newlink(dev, tb, &p, fwmark); | |
be42da0e ND |
503 | } |
504 | ||
505 | static int ipip_changelink(struct net_device *dev, struct nlattr *tb[], | |
ad744b22 MS |
506 | struct nlattr *data[], |
507 | struct netlink_ext_ack *extack) | |
be42da0e | 508 | { |
9830ad4c | 509 | struct ip_tunnel *t = netdev_priv(dev); |
be42da0e | 510 | struct ip_tunnel_parm p; |
473ab820 | 511 | struct ip_tunnel_encap ipencap; |
cfc7381b | 512 | bool collect_md; |
9830ad4c | 513 | __u32 fwmark = t->fwmark; |
473ab820 TH |
514 | |
515 | if (ipip_netlink_encap_parms(data, &ipencap)) { | |
473ab820 TH |
516 | int err = ip_tunnel_encap_setup(t, &ipencap); |
517 | ||
518 | if (err < 0) | |
519 | return err; | |
520 | } | |
be42da0e | 521 | |
9830ad4c | 522 | ipip_netlink_parms(data, &p, &collect_md, &fwmark); |
cfc7381b AS |
523 | if (collect_md) |
524 | return -EINVAL; | |
be42da0e ND |
525 | |
526 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
527 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
528 | return -EINVAL; | |
529 | ||
9830ad4c | 530 | return ip_tunnel_changelink(dev, tb, &p, fwmark); |
be42da0e ND |
531 | } |
532 | ||
0974658d ND |
533 | static size_t ipip_get_size(const struct net_device *dev) |
534 | { | |
535 | return | |
536 | /* IFLA_IPTUN_LINK */ | |
537 | nla_total_size(4) + | |
538 | /* IFLA_IPTUN_LOCAL */ | |
539 | nla_total_size(4) + | |
540 | /* IFLA_IPTUN_REMOTE */ | |
541 | nla_total_size(4) + | |
542 | /* IFLA_IPTUN_TTL */ | |
543 | nla_total_size(1) + | |
544 | /* IFLA_IPTUN_TOS */ | |
545 | nla_total_size(1) + | |
1b69e7e6 SH |
546 | /* IFLA_IPTUN_PROTO */ |
547 | nla_total_size(1) + | |
befe2aa1 ND |
548 | /* IFLA_IPTUN_PMTUDISC */ |
549 | nla_total_size(1) + | |
473ab820 TH |
550 | /* IFLA_IPTUN_ENCAP_TYPE */ |
551 | nla_total_size(2) + | |
552 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
553 | nla_total_size(2) + | |
554 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
555 | nla_total_size(2) + | |
556 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
557 | nla_total_size(2) + | |
cfc7381b AS |
558 | /* IFLA_IPTUN_COLLECT_METADATA */ |
559 | nla_total_size(0) + | |
9830ad4c CG |
560 | /* IFLA_IPTUN_FWMARK */ |
561 | nla_total_size(4) + | |
0974658d ND |
562 | 0; |
563 | } | |
564 | ||
565 | static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
566 | { | |
567 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
568 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
569 | ||
570 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
571 | nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || |
572 | nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
0974658d | 573 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || |
befe2aa1 | 574 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
1b69e7e6 | 575 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || |
befe2aa1 | 576 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, |
9830ad4c CG |
577 | !!(parm->iph.frag_off & htons(IP_DF))) || |
578 | nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) | |
0974658d | 579 | goto nla_put_failure; |
473ab820 TH |
580 | |
581 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, | |
582 | tunnel->encap.type) || | |
3e97fa70 SD |
583 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, |
584 | tunnel->encap.sport) || | |
585 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, | |
586 | tunnel->encap.dport) || | |
473ab820 | 587 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, |
e1b2cb65 | 588 | tunnel->encap.flags)) |
473ab820 TH |
589 | goto nla_put_failure; |
590 | ||
cfc7381b AS |
591 | if (tunnel->collect_md) |
592 | if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) | |
593 | goto nla_put_failure; | |
0974658d ND |
594 | return 0; |
595 | ||
596 | nla_put_failure: | |
597 | return -EMSGSIZE; | |
598 | } | |
599 | ||
be42da0e ND |
600 | static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = { |
601 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
602 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
603 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
604 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
605 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1b69e7e6 | 606 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, |
be42da0e | 607 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, |
473ab820 TH |
608 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
609 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
610 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
611 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
cfc7381b | 612 | [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, |
9830ad4c | 613 | [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, |
be42da0e ND |
614 | }; |
615 | ||
0974658d ND |
616 | static struct rtnl_link_ops ipip_link_ops __read_mostly = { |
617 | .kind = "ipip", | |
618 | .maxtype = IFLA_IPTUN_MAX, | |
be42da0e | 619 | .policy = ipip_policy, |
0974658d | 620 | .priv_size = sizeof(struct ip_tunnel), |
be42da0e | 621 | .setup = ipip_tunnel_setup, |
1b69e7e6 | 622 | .validate = ipip_tunnel_validate, |
be42da0e ND |
623 | .newlink = ipip_newlink, |
624 | .changelink = ipip_changelink, | |
fd58156e | 625 | .dellink = ip_tunnel_dellink, |
0974658d ND |
626 | .get_size = ipip_get_size, |
627 | .fill_info = ipip_fill_info, | |
1728d4fa | 628 | .get_link_net = ip_tunnel_get_link_net, |
0974658d ND |
629 | }; |
630 | ||
6dcd814b | 631 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
1da177e4 LT |
632 | .handler = ipip_rcv, |
633 | .err_handler = ipip_err, | |
d2acc347 | 634 | .priority = 1, |
1da177e4 LT |
635 | }; |
636 | ||
1b69e7e6 SH |
637 | #if IS_ENABLED(CONFIG_MPLS) |
638 | static struct xfrm_tunnel mplsip_handler __read_mostly = { | |
639 | .handler = mplsip_rcv, | |
640 | .err_handler = ipip_err, | |
641 | .priority = 1, | |
642 | }; | |
643 | #endif | |
644 | ||
2c8c1e72 | 645 | static int __net_init ipip_init_net(struct net *net) |
10dc4c7b | 646 | { |
fd58156e | 647 | return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0"); |
10dc4c7b PE |
648 | } |
649 | ||
64bc1781 | 650 | static void __net_exit ipip_exit_batch_net(struct list_head *list_net) |
10dc4c7b | 651 | { |
64bc1781 | 652 | ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops); |
10dc4c7b PE |
653 | } |
654 | ||
655 | static struct pernet_operations ipip_net_ops = { | |
656 | .init = ipip_init_net, | |
64bc1781 | 657 | .exit_batch = ipip_exit_batch_net, |
86de8a63 | 658 | .id = &ipip_net_id, |
fd58156e | 659 | .size = sizeof(struct ip_tunnel_net), |
10dc4c7b PE |
660 | }; |
661 | ||
1da177e4 LT |
662 | static int __init ipip_init(void) |
663 | { | |
664 | int err; | |
665 | ||
1b69e7e6 | 666 | pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n"); |
1da177e4 | 667 | |
d5aa407f AD |
668 | err = register_pernet_device(&ipip_net_ops); |
669 | if (err < 0) | |
670 | return err; | |
671 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); | |
672 | if (err < 0) { | |
058bd4d2 | 673 | pr_info("%s: can't register tunnel\n", __func__); |
1b69e7e6 SH |
674 | goto xfrm_tunnel_ipip_failed; |
675 | } | |
676 | #if IS_ENABLED(CONFIG_MPLS) | |
677 | err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); | |
678 | if (err < 0) { | |
679 | pr_info("%s: can't register tunnel\n", __func__); | |
680 | goto xfrm_tunnel_mplsip_failed; | |
1da177e4 | 681 | } |
1b69e7e6 | 682 | #endif |
0974658d ND |
683 | err = rtnl_link_register(&ipip_link_ops); |
684 | if (err < 0) | |
685 | goto rtnl_link_failed; | |
686 | ||
687 | out: | |
1da177e4 | 688 | return err; |
0974658d ND |
689 | |
690 | rtnl_link_failed: | |
1b69e7e6 | 691 | #if IS_ENABLED(CONFIG_MPLS) |
57ebc8f0 | 692 | xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); |
1b69e7e6 SH |
693 | xfrm_tunnel_mplsip_failed: |
694 | ||
695 | #endif | |
0974658d | 696 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
1b69e7e6 | 697 | xfrm_tunnel_ipip_failed: |
0974658d ND |
698 | unregister_pernet_device(&ipip_net_ops); |
699 | goto out; | |
1da177e4 LT |
700 | } |
701 | ||
702 | static void __exit ipip_fini(void) | |
703 | { | |
0974658d | 704 | rtnl_link_unregister(&ipip_link_ops); |
c0d56408 | 705 | if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) |
058bd4d2 | 706 | pr_info("%s: can't deregister tunnel\n", __func__); |
1b69e7e6 SH |
707 | #if IS_ENABLED(CONFIG_MPLS) |
708 | if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS)) | |
709 | pr_info("%s: can't deregister tunnel\n", __func__); | |
710 | #endif | |
86de8a63 | 711 | unregister_pernet_device(&ipip_net_ops); |
1da177e4 LT |
712 | } |
713 | ||
714 | module_init(ipip_init); | |
715 | module_exit(ipip_fini); | |
716 | MODULE_LICENSE("GPL"); | |
f98f89a0 | 717 | MODULE_ALIAS_RTNL_LINK("ipip"); |
8909c9ad | 718 | MODULE_ALIAS_NETDEV("tunl0"); |