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Commit | Line | Data |
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f203b76d SK |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * XFRM virtual interface | |
4 | * | |
5 | * Copyright (C) 2018 secunet Security Networks AG | |
6 | * | |
7 | * Author: | |
8 | * Steffen Klassert <steffen.klassert@secunet.com> | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/capability.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/sockios.h> | |
16 | #include <linux/icmp.h> | |
17 | #include <linux/if.h> | |
18 | #include <linux/in.h> | |
19 | #include <linux/ip.h> | |
20 | #include <linux/net.h> | |
21 | #include <linux/in6.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/if_link.h> | |
24 | #include <linux/if_arp.h> | |
25 | #include <linux/icmpv6.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/route.h> | |
28 | #include <linux/rtnetlink.h> | |
29 | #include <linux/netfilter_ipv6.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/hash.h> | |
32 | ||
33 | #include <linux/uaccess.h> | |
34 | #include <linux/atomic.h> | |
35 | ||
36 | #include <net/icmp.h> | |
37 | #include <net/ip.h> | |
38 | #include <net/ipv6.h> | |
39 | #include <net/ip6_route.h> | |
8f9a1fa4 | 40 | #include <net/ip_tunnels.h> |
f203b76d SK |
41 | #include <net/addrconf.h> |
42 | #include <net/xfrm.h> | |
43 | #include <net/net_namespace.h> | |
44 | #include <net/netns/generic.h> | |
45 | #include <linux/etherdevice.h> | |
46 | ||
47 | static int xfrmi_dev_init(struct net_device *dev); | |
48 | static void xfrmi_dev_setup(struct net_device *dev); | |
49 | static struct rtnl_link_ops xfrmi_link_ops __read_mostly; | |
50 | static unsigned int xfrmi_net_id __read_mostly; | |
2749c697 | 51 | static const struct net_device_ops xfrmi_netdev_ops; |
f203b76d | 52 | |
e98e4456 EB |
53 | #define XFRMI_HASH_BITS 8 |
54 | #define XFRMI_HASH_SIZE BIT(XFRMI_HASH_BITS) | |
f203b76d SK |
55 | |
56 | struct xfrmi_net { | |
57 | /* lists for storing interfaces in use */ | |
e98e4456 | 58 | struct xfrm_if __rcu *xfrmi[XFRMI_HASH_SIZE]; |
f203b76d SK |
59 | }; |
60 | ||
61 | #define for_each_xfrmi_rcu(start, xi) \ | |
62 | for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next)) | |
63 | ||
e98e4456 EB |
64 | static u32 xfrmi_hash(u32 if_id) |
65 | { | |
66 | return hash_32(if_id, XFRMI_HASH_BITS); | |
67 | } | |
68 | ||
f203b76d SK |
69 | static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x) |
70 | { | |
71 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
72 | struct xfrm_if *xi; | |
73 | ||
e98e4456 | 74 | for_each_xfrmi_rcu(xfrmn->xfrmi[xfrmi_hash(x->if_id)], xi) { |
f203b76d SK |
75 | if (x->if_id == xi->p.if_id && |
76 | (xi->dev->flags & IFF_UP)) | |
77 | return xi; | |
78 | } | |
79 | ||
80 | return NULL; | |
81 | } | |
82 | ||
025c65e1 MW |
83 | static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb, |
84 | unsigned short family) | |
f203b76d | 85 | { |
2749c697 | 86 | struct net_device *dev; |
025c65e1 | 87 | int ifindex = 0; |
f203b76d | 88 | |
660899dd | 89 | if (!secpath_exists(skb) || !skb->dev) |
f203b76d SK |
90 | return NULL; |
91 | ||
025c65e1 MW |
92 | switch (family) { |
93 | case AF_INET6: | |
94 | ifindex = inet6_sdif(skb); | |
95 | break; | |
96 | case AF_INET: | |
97 | ifindex = inet_sdif(skb); | |
98 | break; | |
99 | } | |
025c65e1 | 100 | |
2749c697 EB |
101 | if (ifindex) { |
102 | struct net *net = xs_net(xfrm_input_state(skb)); | |
f203b76d | 103 | |
2749c697 EB |
104 | dev = dev_get_by_index_rcu(net, ifindex); |
105 | } else { | |
106 | dev = skb->dev; | |
f203b76d SK |
107 | } |
108 | ||
2749c697 EB |
109 | if (!dev || !(dev->flags & IFF_UP)) |
110 | return NULL; | |
111 | if (dev->netdev_ops != &xfrmi_netdev_ops) | |
112 | return NULL; | |
113 | ||
114 | return netdev_priv(dev); | |
f203b76d SK |
115 | } |
116 | ||
117 | static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi) | |
118 | { | |
e98e4456 | 119 | struct xfrm_if __rcu **xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)]; |
f203b76d SK |
120 | |
121 | rcu_assign_pointer(xi->next , rtnl_dereference(*xip)); | |
122 | rcu_assign_pointer(*xip, xi); | |
123 | } | |
124 | ||
125 | static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi) | |
126 | { | |
127 | struct xfrm_if __rcu **xip; | |
128 | struct xfrm_if *iter; | |
129 | ||
e98e4456 | 130 | for (xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)]; |
f203b76d SK |
131 | (iter = rtnl_dereference(*xip)) != NULL; |
132 | xip = &iter->next) { | |
133 | if (xi == iter) { | |
134 | rcu_assign_pointer(*xip, xi->next); | |
135 | break; | |
136 | } | |
137 | } | |
138 | } | |
139 | ||
140 | static void xfrmi_dev_free(struct net_device *dev) | |
141 | { | |
4da40259 LR |
142 | struct xfrm_if *xi = netdev_priv(dev); |
143 | ||
144 | gro_cells_destroy(&xi->gro_cells); | |
f203b76d SK |
145 | free_percpu(dev->tstats); |
146 | } | |
147 | ||
56c5ee1a | 148 | static int xfrmi_create(struct net_device *dev) |
f203b76d SK |
149 | { |
150 | struct xfrm_if *xi = netdev_priv(dev); | |
151 | struct net *net = dev_net(dev); | |
152 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
153 | int err; | |
154 | ||
155 | dev->rtnl_link_ops = &xfrmi_link_ops; | |
156 | err = register_netdevice(dev); | |
157 | if (err < 0) | |
158 | goto out; | |
159 | ||
f203b76d SK |
160 | xfrmi_link(xfrmn, xi); |
161 | ||
162 | return 0; | |
163 | ||
164 | out: | |
165 | return err; | |
166 | } | |
167 | ||
56c5ee1a | 168 | static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p) |
f203b76d SK |
169 | { |
170 | struct xfrm_if __rcu **xip; | |
171 | struct xfrm_if *xi; | |
172 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
173 | ||
e98e4456 | 174 | for (xip = &xfrmn->xfrmi[xfrmi_hash(p->if_id)]; |
f203b76d | 175 | (xi = rtnl_dereference(*xip)) != NULL; |
56c5ee1a ND |
176 | xip = &xi->next) |
177 | if (xi->p.if_id == p->if_id) | |
f203b76d | 178 | return xi; |
56c5ee1a ND |
179 | |
180 | return NULL; | |
f203b76d SK |
181 | } |
182 | ||
183 | static void xfrmi_dev_uninit(struct net_device *dev) | |
184 | { | |
185 | struct xfrm_if *xi = netdev_priv(dev); | |
186 | struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id); | |
187 | ||
188 | xfrmi_unlink(xfrmn, xi); | |
f203b76d SK |
189 | } |
190 | ||
191 | static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet) | |
192 | { | |
193 | skb->tstamp = 0; | |
194 | skb->pkt_type = PACKET_HOST; | |
195 | skb->skb_iif = 0; | |
196 | skb->ignore_df = 0; | |
197 | skb_dst_drop(skb); | |
895b5c9f | 198 | nf_reset_ct(skb); |
f203b76d SK |
199 | nf_reset_trace(skb); |
200 | ||
201 | if (!xnet) | |
202 | return; | |
203 | ||
204 | ipvs_reset(skb); | |
205 | secpath_reset(skb); | |
206 | skb_orphan(skb); | |
207 | skb->mark = 0; | |
208 | } | |
209 | ||
210 | static int xfrmi_rcv_cb(struct sk_buff *skb, int err) | |
211 | { | |
4c145dce | 212 | const struct xfrm_mode *inner_mode; |
f203b76d SK |
213 | struct net_device *dev; |
214 | struct xfrm_state *x; | |
215 | struct xfrm_if *xi; | |
216 | bool xnet; | |
217 | ||
26912e37 | 218 | if (err && !secpath_exists(skb)) |
f203b76d SK |
219 | return 0; |
220 | ||
221 | x = xfrm_input_state(skb); | |
222 | ||
223 | xi = xfrmi_lookup(xs_net(x), x); | |
224 | if (!xi) | |
225 | return 1; | |
226 | ||
227 | dev = xi->dev; | |
228 | skb->dev = dev; | |
229 | ||
230 | if (err) { | |
231 | dev->stats.rx_errors++; | |
232 | dev->stats.rx_dropped++; | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | xnet = !net_eq(xi->net, dev_net(skb->dev)); | |
238 | ||
239 | if (xnet) { | |
c9500d7b | 240 | inner_mode = &x->inner_mode; |
f203b76d SK |
241 | |
242 | if (x->sel.family == AF_UNSPEC) { | |
243 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
244 | if (inner_mode == NULL) { | |
245 | XFRM_INC_STATS(dev_net(skb->dev), | |
246 | LINUX_MIB_XFRMINSTATEMODEERROR); | |
247 | return -EINVAL; | |
248 | } | |
249 | } | |
250 | ||
251 | if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, | |
b45714b1 | 252 | inner_mode->family)) |
f203b76d SK |
253 | return -EPERM; |
254 | } | |
255 | ||
256 | xfrmi_scrub_packet(skb, xnet); | |
c852162e | 257 | dev_sw_netstats_rx_add(dev, skb->len); |
f203b76d SK |
258 | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static int | |
263 | xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) | |
264 | { | |
265 | struct xfrm_if *xi = netdev_priv(dev); | |
266 | struct net_device_stats *stats = &xi->dev->stats; | |
267 | struct dst_entry *dst = skb_dst(skb); | |
268 | unsigned int length = skb->len; | |
269 | struct net_device *tdev; | |
270 | struct xfrm_state *x; | |
271 | int err = -1; | |
272 | int mtu; | |
273 | ||
f203b76d | 274 | dst_hold(dst); |
bc56b334 | 275 | dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id); |
f203b76d SK |
276 | if (IS_ERR(dst)) { |
277 | err = PTR_ERR(dst); | |
278 | dst = NULL; | |
279 | goto tx_err_link_failure; | |
280 | } | |
281 | ||
282 | x = dst->xfrm; | |
283 | if (!x) | |
284 | goto tx_err_link_failure; | |
285 | ||
286 | if (x->if_id != xi->p.if_id) | |
287 | goto tx_err_link_failure; | |
288 | ||
289 | tdev = dst->dev; | |
290 | ||
291 | if (tdev == dev) { | |
292 | stats->collisions++; | |
293 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
e0aaa332 | 294 | dev->name); |
f203b76d SK |
295 | goto tx_err_dst_release; |
296 | } | |
297 | ||
298 | mtu = dst_mtu(dst); | |
18f97696 EB |
299 | if ((!skb_is_gso(skb) && skb->len > mtu) || |
300 | (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu))) { | |
8aaea2b0 | 301 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
f203b76d SK |
302 | |
303 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
304 | if (mtu < IPV6_MIN_MTU) | |
305 | mtu = IPV6_MIN_MTU; | |
306 | ||
fd3b56b4 LW |
307 | if (skb->len > 1280) |
308 | icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
309 | else | |
310 | goto xmit; | |
f203b76d | 311 | } else { |
8fc0e3b6 EB |
312 | if (!(ip_hdr(skb)->frag_off & htons(IP_DF))) |
313 | goto xmit; | |
45942ba8 JD |
314 | icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
315 | htonl(mtu)); | |
f203b76d SK |
316 | } |
317 | ||
318 | dst_release(dst); | |
319 | return -EMSGSIZE; | |
320 | } | |
321 | ||
8fc0e3b6 | 322 | xmit: |
f203b76d SK |
323 | xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev))); |
324 | skb_dst_set(skb, dst); | |
325 | skb->dev = tdev; | |
326 | ||
327 | err = dst_output(xi->net, skb->sk, skb); | |
328 | if (net_xmit_eval(err) == 0) { | |
0064c5c1 | 329 | dev_sw_netstats_tx_add(dev, 1, length); |
f203b76d SK |
330 | } else { |
331 | stats->tx_errors++; | |
332 | stats->tx_aborted_errors++; | |
333 | } | |
334 | ||
335 | return 0; | |
336 | tx_err_link_failure: | |
337 | stats->tx_carrier_errors++; | |
338 | dst_link_failure(skb); | |
339 | tx_err_dst_release: | |
340 | dst_release(dst); | |
341 | return err; | |
342 | } | |
343 | ||
344 | static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev) | |
345 | { | |
346 | struct xfrm_if *xi = netdev_priv(dev); | |
347 | struct net_device_stats *stats = &xi->dev->stats; | |
f042365d | 348 | struct dst_entry *dst = skb_dst(skb); |
f203b76d SK |
349 | struct flowi fl; |
350 | int ret; | |
351 | ||
352 | memset(&fl, 0, sizeof(fl)); | |
353 | ||
354 | switch (skb->protocol) { | |
355 | case htons(ETH_P_IPV6): | |
356 | xfrm_decode_session(skb, &fl, AF_INET6); | |
357 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); | |
f042365d ND |
358 | if (!dst) { |
359 | fl.u.ip6.flowi6_oif = dev->ifindex; | |
360 | fl.u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC; | |
361 | dst = ip6_route_output(dev_net(dev), NULL, &fl.u.ip6); | |
362 | if (dst->error) { | |
363 | dst_release(dst); | |
364 | stats->tx_carrier_errors++; | |
365 | goto tx_err; | |
366 | } | |
367 | skb_dst_set(skb, dst); | |
368 | } | |
f203b76d SK |
369 | break; |
370 | case htons(ETH_P_IP): | |
371 | xfrm_decode_session(skb, &fl, AF_INET); | |
372 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
f042365d ND |
373 | if (!dst) { |
374 | struct rtable *rt; | |
375 | ||
376 | fl.u.ip4.flowi4_oif = dev->ifindex; | |
377 | fl.u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC; | |
378 | rt = __ip_route_output_key(dev_net(dev), &fl.u.ip4); | |
379 | if (IS_ERR(rt)) { | |
380 | stats->tx_carrier_errors++; | |
381 | goto tx_err; | |
382 | } | |
383 | skb_dst_set(skb, &rt->dst); | |
384 | } | |
f203b76d SK |
385 | break; |
386 | default: | |
387 | goto tx_err; | |
388 | } | |
389 | ||
22d6552f | 390 | fl.flowi_oif = xi->p.link; |
f203b76d SK |
391 | |
392 | ret = xfrmi_xmit2(skb, dev, &fl); | |
393 | if (ret < 0) | |
394 | goto tx_err; | |
395 | ||
396 | return NETDEV_TX_OK; | |
397 | ||
398 | tx_err: | |
399 | stats->tx_errors++; | |
400 | stats->tx_dropped++; | |
401 | kfree_skb(skb); | |
402 | return NETDEV_TX_OK; | |
403 | } | |
404 | ||
405 | static int xfrmi4_err(struct sk_buff *skb, u32 info) | |
406 | { | |
407 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
408 | struct net *net = dev_net(skb->dev); | |
409 | int protocol = iph->protocol; | |
410 | struct ip_comp_hdr *ipch; | |
411 | struct ip_esp_hdr *esph; | |
412 | struct ip_auth_hdr *ah ; | |
413 | struct xfrm_state *x; | |
414 | struct xfrm_if *xi; | |
415 | __be32 spi; | |
416 | ||
417 | switch (protocol) { | |
418 | case IPPROTO_ESP: | |
419 | esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); | |
420 | spi = esph->spi; | |
421 | break; | |
422 | case IPPROTO_AH: | |
423 | ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); | |
424 | spi = ah->spi; | |
425 | break; | |
426 | case IPPROTO_COMP: | |
427 | ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); | |
428 | spi = htonl(ntohs(ipch->cpi)); | |
429 | break; | |
430 | default: | |
431 | return 0; | |
432 | } | |
433 | ||
434 | switch (icmp_hdr(skb)->type) { | |
435 | case ICMP_DEST_UNREACH: | |
436 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) | |
437 | return 0; | |
135436a7 | 438 | break; |
f203b76d SK |
439 | case ICMP_REDIRECT: |
440 | break; | |
441 | default: | |
442 | return 0; | |
443 | } | |
444 | ||
445 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, | |
446 | spi, protocol, AF_INET); | |
447 | if (!x) | |
448 | return 0; | |
449 | ||
450 | xi = xfrmi_lookup(net, x); | |
451 | if (!xi) { | |
452 | xfrm_state_put(x); | |
453 | return -1; | |
454 | } | |
455 | ||
456 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) | |
d888f396 | 457 | ipv4_update_pmtu(skb, net, info, 0, protocol); |
f203b76d | 458 | else |
1042caa7 | 459 | ipv4_redirect(skb, net, 0, protocol); |
f203b76d SK |
460 | xfrm_state_put(x); |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
466 | u8 type, u8 code, int offset, __be32 info) | |
467 | { | |
468 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; | |
469 | struct net *net = dev_net(skb->dev); | |
470 | int protocol = iph->nexthdr; | |
471 | struct ip_comp_hdr *ipch; | |
472 | struct ip_esp_hdr *esph; | |
473 | struct ip_auth_hdr *ah; | |
474 | struct xfrm_state *x; | |
475 | struct xfrm_if *xi; | |
476 | __be32 spi; | |
477 | ||
478 | switch (protocol) { | |
479 | case IPPROTO_ESP: | |
480 | esph = (struct ip_esp_hdr *)(skb->data + offset); | |
481 | spi = esph->spi; | |
482 | break; | |
483 | case IPPROTO_AH: | |
484 | ah = (struct ip_auth_hdr *)(skb->data + offset); | |
485 | spi = ah->spi; | |
486 | break; | |
487 | case IPPROTO_COMP: | |
488 | ipch = (struct ip_comp_hdr *)(skb->data + offset); | |
489 | spi = htonl(ntohs(ipch->cpi)); | |
490 | break; | |
491 | default: | |
492 | return 0; | |
493 | } | |
494 | ||
495 | if (type != ICMPV6_PKT_TOOBIG && | |
496 | type != NDISC_REDIRECT) | |
497 | return 0; | |
498 | ||
499 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, | |
500 | spi, protocol, AF_INET6); | |
501 | if (!x) | |
502 | return 0; | |
503 | ||
504 | xi = xfrmi_lookup(net, x); | |
505 | if (!xi) { | |
506 | xfrm_state_put(x); | |
507 | return -1; | |
508 | } | |
509 | ||
510 | if (type == NDISC_REDIRECT) | |
511 | ip6_redirect(skb, net, skb->dev->ifindex, 0, | |
512 | sock_net_uid(net, NULL)); | |
513 | else | |
514 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); | |
515 | xfrm_state_put(x); | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p) | |
521 | { | |
522 | if (xi->p.link != p->link) | |
523 | return -EINVAL; | |
524 | ||
525 | xi->p.if_id = p->if_id; | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p) | |
531 | { | |
c5d1030f | 532 | struct net *net = xi->net; |
f203b76d SK |
533 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
534 | int err; | |
535 | ||
536 | xfrmi_unlink(xfrmn, xi); | |
537 | synchronize_net(); | |
538 | err = xfrmi_change(xi, p); | |
539 | xfrmi_link(xfrmn, xi); | |
540 | netdev_state_change(xi->dev); | |
541 | return err; | |
542 | } | |
543 | ||
f203b76d SK |
544 | static int xfrmi_get_iflink(const struct net_device *dev) |
545 | { | |
546 | struct xfrm_if *xi = netdev_priv(dev); | |
547 | ||
22d6552f | 548 | return xi->p.link; |
f203b76d SK |
549 | } |
550 | ||
f203b76d SK |
551 | static const struct net_device_ops xfrmi_netdev_ops = { |
552 | .ndo_init = xfrmi_dev_init, | |
553 | .ndo_uninit = xfrmi_dev_uninit, | |
554 | .ndo_start_xmit = xfrmi_xmit, | |
0064c5c1 | 555 | .ndo_get_stats64 = dev_get_tstats64, |
f203b76d SK |
556 | .ndo_get_iflink = xfrmi_get_iflink, |
557 | }; | |
558 | ||
559 | static void xfrmi_dev_setup(struct net_device *dev) | |
560 | { | |
561 | dev->netdev_ops = &xfrmi_netdev_ops; | |
8f9a1fa4 | 562 | dev->header_ops = &ip_tunnel_header_ops; |
f203b76d | 563 | dev->type = ARPHRD_NONE; |
f203b76d SK |
564 | dev->mtu = ETH_DATA_LEN; |
565 | dev->min_mtu = ETH_MIN_MTU; | |
f042365d | 566 | dev->max_mtu = IP_MAX_MTU; |
f203b76d SK |
567 | dev->flags = IFF_NOARP; |
568 | dev->needs_free_netdev = true; | |
569 | dev->priv_destructor = xfrmi_dev_free; | |
570 | netif_keep_dst(dev); | |
22d6552f ND |
571 | |
572 | eth_broadcast_addr(dev->broadcast); | |
f203b76d SK |
573 | } |
574 | ||
18f97696 EB |
575 | #define XFRMI_FEATURES (NETIF_F_SG | \ |
576 | NETIF_F_FRAGLIST | \ | |
577 | NETIF_F_GSO_SOFTWARE | \ | |
578 | NETIF_F_HW_CSUM) | |
579 | ||
f203b76d SK |
580 | static int xfrmi_dev_init(struct net_device *dev) |
581 | { | |
582 | struct xfrm_if *xi = netdev_priv(dev); | |
22d6552f | 583 | struct net_device *phydev = __dev_get_by_index(xi->net, xi->p.link); |
f203b76d SK |
584 | int err; |
585 | ||
586 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
587 | if (!dev->tstats) | |
588 | return -ENOMEM; | |
589 | ||
590 | err = gro_cells_init(&xi->gro_cells, dev); | |
591 | if (err) { | |
592 | free_percpu(dev->tstats); | |
593 | return err; | |
594 | } | |
595 | ||
596 | dev->features |= NETIF_F_LLTX; | |
18f97696 EB |
597 | dev->features |= XFRMI_FEATURES; |
598 | dev->hw_features |= XFRMI_FEATURES; | |
f203b76d | 599 | |
22d6552f ND |
600 | if (phydev) { |
601 | dev->needed_headroom = phydev->needed_headroom; | |
602 | dev->needed_tailroom = phydev->needed_tailroom; | |
f203b76d | 603 | |
22d6552f ND |
604 | if (is_zero_ether_addr(dev->dev_addr)) |
605 | eth_hw_addr_inherit(dev, phydev); | |
606 | if (is_zero_ether_addr(dev->broadcast)) | |
607 | memcpy(dev->broadcast, phydev->broadcast, | |
608 | dev->addr_len); | |
609 | } else { | |
610 | eth_hw_addr_random(dev); | |
611 | eth_broadcast_addr(dev->broadcast); | |
612 | } | |
f203b76d SK |
613 | |
614 | return 0; | |
615 | } | |
616 | ||
617 | static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[], | |
618 | struct netlink_ext_ack *extack) | |
619 | { | |
620 | return 0; | |
621 | } | |
622 | ||
623 | static void xfrmi_netlink_parms(struct nlattr *data[], | |
624 | struct xfrm_if_parms *parms) | |
625 | { | |
626 | memset(parms, 0, sizeof(*parms)); | |
627 | ||
628 | if (!data) | |
629 | return; | |
630 | ||
631 | if (data[IFLA_XFRM_LINK]) | |
632 | parms->link = nla_get_u32(data[IFLA_XFRM_LINK]); | |
633 | ||
634 | if (data[IFLA_XFRM_IF_ID]) | |
635 | parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]); | |
636 | } | |
637 | ||
638 | static int xfrmi_newlink(struct net *src_net, struct net_device *dev, | |
639 | struct nlattr *tb[], struct nlattr *data[], | |
640 | struct netlink_ext_ack *extack) | |
641 | { | |
642 | struct net *net = dev_net(dev); | |
a05fa0ac | 643 | struct xfrm_if_parms p = {}; |
f203b76d | 644 | struct xfrm_if *xi; |
56c5ee1a | 645 | int err; |
f203b76d | 646 | |
56c5ee1a | 647 | xfrmi_netlink_parms(data, &p); |
a05fa0ac AA |
648 | if (!p.if_id) { |
649 | NL_SET_ERR_MSG(extack, "if_id must be non zero"); | |
650 | return -EINVAL; | |
651 | } | |
652 | ||
56c5ee1a ND |
653 | xi = xfrmi_locate(net, &p); |
654 | if (xi) | |
655 | return -EEXIST; | |
656 | ||
657 | xi = netdev_priv(dev); | |
658 | xi->p = p; | |
659 | xi->net = net; | |
660 | xi->dev = dev; | |
56c5ee1a ND |
661 | |
662 | err = xfrmi_create(dev); | |
56c5ee1a | 663 | return err; |
f203b76d SK |
664 | } |
665 | ||
666 | static void xfrmi_dellink(struct net_device *dev, struct list_head *head) | |
667 | { | |
668 | unregister_netdevice_queue(dev, head); | |
669 | } | |
670 | ||
671 | static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], | |
672 | struct nlattr *data[], | |
673 | struct netlink_ext_ack *extack) | |
674 | { | |
c5d1030f ND |
675 | struct xfrm_if *xi = netdev_priv(dev); |
676 | struct net *net = xi->net; | |
a05fa0ac AA |
677 | struct xfrm_if_parms p = {}; |
678 | ||
649990b3 | 679 | xfrmi_netlink_parms(data, &p); |
a05fa0ac AA |
680 | if (!p.if_id) { |
681 | NL_SET_ERR_MSG(extack, "if_id must be non zero"); | |
682 | return -EINVAL; | |
683 | } | |
f203b76d | 684 | |
e9e7e85d | 685 | xi = xfrmi_locate(net, &p); |
56c5ee1a | 686 | if (!xi) { |
44e2b838 BW |
687 | xi = netdev_priv(dev); |
688 | } else { | |
f203b76d SK |
689 | if (xi->dev != dev) |
690 | return -EEXIST; | |
44e2b838 | 691 | } |
f203b76d | 692 | |
e9e7e85d | 693 | return xfrmi_update(xi, &p); |
f203b76d SK |
694 | } |
695 | ||
696 | static size_t xfrmi_get_size(const struct net_device *dev) | |
697 | { | |
698 | return | |
699 | /* IFLA_XFRM_LINK */ | |
700 | nla_total_size(4) + | |
701 | /* IFLA_XFRM_IF_ID */ | |
702 | nla_total_size(4) + | |
703 | 0; | |
704 | } | |
705 | ||
706 | static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
707 | { | |
708 | struct xfrm_if *xi = netdev_priv(dev); | |
709 | struct xfrm_if_parms *parm = &xi->p; | |
710 | ||
711 | if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) || | |
712 | nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id)) | |
713 | goto nla_put_failure; | |
714 | return 0; | |
715 | ||
716 | nla_put_failure: | |
717 | return -EMSGSIZE; | |
718 | } | |
719 | ||
211d6f2d | 720 | static struct net *xfrmi_get_link_net(const struct net_device *dev) |
f203b76d SK |
721 | { |
722 | struct xfrm_if *xi = netdev_priv(dev); | |
723 | ||
c5d1030f | 724 | return xi->net; |
f203b76d SK |
725 | } |
726 | ||
727 | static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = { | |
728 | [IFLA_XFRM_LINK] = { .type = NLA_U32 }, | |
729 | [IFLA_XFRM_IF_ID] = { .type = NLA_U32 }, | |
730 | }; | |
731 | ||
732 | static struct rtnl_link_ops xfrmi_link_ops __read_mostly = { | |
733 | .kind = "xfrm", | |
734 | .maxtype = IFLA_XFRM_MAX, | |
735 | .policy = xfrmi_policy, | |
736 | .priv_size = sizeof(struct xfrm_if), | |
737 | .setup = xfrmi_dev_setup, | |
738 | .validate = xfrmi_validate, | |
739 | .newlink = xfrmi_newlink, | |
740 | .dellink = xfrmi_dellink, | |
741 | .changelink = xfrmi_changelink, | |
742 | .get_size = xfrmi_get_size, | |
743 | .fill_info = xfrmi_fill_info, | |
744 | .get_link_net = xfrmi_get_link_net, | |
745 | }; | |
746 | ||
c95c5f58 ND |
747 | static void __net_exit xfrmi_exit_batch_net(struct list_head *net_exit_list) |
748 | { | |
749 | struct net *net; | |
750 | LIST_HEAD(list); | |
751 | ||
752 | rtnl_lock(); | |
753 | list_for_each_entry(net, net_exit_list, exit_list) { | |
754 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
755 | struct xfrm_if __rcu **xip; | |
756 | struct xfrm_if *xi; | |
e98e4456 | 757 | int i; |
c95c5f58 | 758 | |
e98e4456 EB |
759 | for (i = 0; i < XFRMI_HASH_SIZE; i++) { |
760 | for (xip = &xfrmn->xfrmi[i]; | |
761 | (xi = rtnl_dereference(*xip)) != NULL; | |
762 | xip = &xi->next) | |
763 | unregister_netdevice_queue(xi->dev, &list); | |
764 | } | |
c95c5f58 ND |
765 | } |
766 | unregister_netdevice_many(&list); | |
767 | rtnl_unlock(); | |
768 | } | |
769 | ||
f203b76d | 770 | static struct pernet_operations xfrmi_net_ops = { |
c95c5f58 | 771 | .exit_batch = xfrmi_exit_batch_net, |
f203b76d SK |
772 | .id = &xfrmi_net_id, |
773 | .size = sizeof(struct xfrmi_net), | |
774 | }; | |
775 | ||
776 | static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = { | |
777 | .handler = xfrm6_rcv, | |
0146dca7 | 778 | .input_handler = xfrm_input, |
f203b76d SK |
779 | .cb_handler = xfrmi_rcv_cb, |
780 | .err_handler = xfrmi6_err, | |
781 | .priority = 10, | |
782 | }; | |
783 | ||
784 | static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = { | |
785 | .handler = xfrm6_rcv, | |
0146dca7 | 786 | .input_handler = xfrm_input, |
f203b76d SK |
787 | .cb_handler = xfrmi_rcv_cb, |
788 | .err_handler = xfrmi6_err, | |
789 | .priority = 10, | |
790 | }; | |
791 | ||
792 | static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = { | |
793 | .handler = xfrm6_rcv, | |
0146dca7 | 794 | .input_handler = xfrm_input, |
f203b76d SK |
795 | .cb_handler = xfrmi_rcv_cb, |
796 | .err_handler = xfrmi6_err, | |
797 | .priority = 10, | |
798 | }; | |
799 | ||
0a0d93b9 | 800 | #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) |
d7b360c2 XL |
801 | static int xfrmi6_rcv_tunnel(struct sk_buff *skb) |
802 | { | |
803 | const xfrm_address_t *saddr; | |
804 | __be32 spi; | |
805 | ||
806 | saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr; | |
807 | spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr); | |
808 | ||
809 | return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL); | |
810 | } | |
811 | ||
812 | static struct xfrm6_tunnel xfrmi_ipv6_handler __read_mostly = { | |
813 | .handler = xfrmi6_rcv_tunnel, | |
814 | .cb_handler = xfrmi_rcv_cb, | |
815 | .err_handler = xfrmi6_err, | |
7fe94612 | 816 | .priority = 2, |
d7b360c2 | 817 | }; |
8b404f46 XL |
818 | |
819 | static struct xfrm6_tunnel xfrmi_ip6ip_handler __read_mostly = { | |
820 | .handler = xfrmi6_rcv_tunnel, | |
821 | .cb_handler = xfrmi_rcv_cb, | |
822 | .err_handler = xfrmi6_err, | |
7fe94612 | 823 | .priority = 2, |
8b404f46 | 824 | }; |
d7b360c2 XL |
825 | #endif |
826 | ||
f203b76d SK |
827 | static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = { |
828 | .handler = xfrm4_rcv, | |
829 | .input_handler = xfrm_input, | |
830 | .cb_handler = xfrmi_rcv_cb, | |
831 | .err_handler = xfrmi4_err, | |
832 | .priority = 10, | |
833 | }; | |
834 | ||
835 | static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = { | |
836 | .handler = xfrm4_rcv, | |
837 | .input_handler = xfrm_input, | |
838 | .cb_handler = xfrmi_rcv_cb, | |
839 | .err_handler = xfrmi4_err, | |
840 | .priority = 10, | |
841 | }; | |
842 | ||
843 | static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = { | |
844 | .handler = xfrm4_rcv, | |
845 | .input_handler = xfrm_input, | |
846 | .cb_handler = xfrmi_rcv_cb, | |
847 | .err_handler = xfrmi4_err, | |
848 | .priority = 10, | |
849 | }; | |
850 | ||
0a0d93b9 | 851 | #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) |
da9bbf05 XL |
852 | static int xfrmi4_rcv_tunnel(struct sk_buff *skb) |
853 | { | |
854 | return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr); | |
855 | } | |
856 | ||
857 | static struct xfrm_tunnel xfrmi_ipip_handler __read_mostly = { | |
858 | .handler = xfrmi4_rcv_tunnel, | |
859 | .cb_handler = xfrmi_rcv_cb, | |
860 | .err_handler = xfrmi4_err, | |
7fe94612 | 861 | .priority = 3, |
da9bbf05 | 862 | }; |
8b404f46 XL |
863 | |
864 | static struct xfrm_tunnel xfrmi_ipip6_handler __read_mostly = { | |
865 | .handler = xfrmi4_rcv_tunnel, | |
866 | .cb_handler = xfrmi_rcv_cb, | |
867 | .err_handler = xfrmi4_err, | |
7fe94612 | 868 | .priority = 2, |
8b404f46 | 869 | }; |
da9bbf05 XL |
870 | #endif |
871 | ||
f203b76d SK |
872 | static int __init xfrmi4_init(void) |
873 | { | |
874 | int err; | |
875 | ||
876 | err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
877 | if (err < 0) | |
878 | goto xfrm_proto_esp_failed; | |
879 | err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH); | |
880 | if (err < 0) | |
881 | goto xfrm_proto_ah_failed; | |
882 | err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); | |
883 | if (err < 0) | |
884 | goto xfrm_proto_comp_failed; | |
0a0d93b9 | 885 | #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) |
da9bbf05 XL |
886 | err = xfrm4_tunnel_register(&xfrmi_ipip_handler, AF_INET); |
887 | if (err < 0) | |
888 | goto xfrm_tunnel_ipip_failed; | |
8b404f46 | 889 | err = xfrm4_tunnel_register(&xfrmi_ipip6_handler, AF_INET6); |
da9bbf05 XL |
890 | if (err < 0) |
891 | goto xfrm_tunnel_ipip6_failed; | |
892 | #endif | |
f203b76d SK |
893 | |
894 | return 0; | |
895 | ||
0a0d93b9 | 896 | #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) |
da9bbf05 XL |
897 | xfrm_tunnel_ipip6_failed: |
898 | xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET); | |
899 | xfrm_tunnel_ipip_failed: | |
900 | xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); | |
901 | #endif | |
f203b76d SK |
902 | xfrm_proto_comp_failed: |
903 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); | |
904 | xfrm_proto_ah_failed: | |
905 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
906 | xfrm_proto_esp_failed: | |
907 | return err; | |
908 | } | |
909 | ||
910 | static void xfrmi4_fini(void) | |
911 | { | |
0a0d93b9 | 912 | #if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) |
8b404f46 | 913 | xfrm4_tunnel_deregister(&xfrmi_ipip6_handler, AF_INET6); |
da9bbf05 XL |
914 | xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET); |
915 | #endif | |
f203b76d SK |
916 | xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); |
917 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); | |
918 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
919 | } | |
920 | ||
921 | static int __init xfrmi6_init(void) | |
922 | { | |
923 | int err; | |
924 | ||
925 | err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
926 | if (err < 0) | |
927 | goto xfrm_proto_esp_failed; | |
928 | err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH); | |
929 | if (err < 0) | |
930 | goto xfrm_proto_ah_failed; | |
931 | err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); | |
932 | if (err < 0) | |
933 | goto xfrm_proto_comp_failed; | |
0a0d93b9 | 934 | #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) |
d7b360c2 XL |
935 | err = xfrm6_tunnel_register(&xfrmi_ipv6_handler, AF_INET6); |
936 | if (err < 0) | |
937 | goto xfrm_tunnel_ipv6_failed; | |
8b404f46 | 938 | err = xfrm6_tunnel_register(&xfrmi_ip6ip_handler, AF_INET); |
d7b360c2 XL |
939 | if (err < 0) |
940 | goto xfrm_tunnel_ip6ip_failed; | |
941 | #endif | |
f203b76d SK |
942 | |
943 | return 0; | |
944 | ||
0a0d93b9 | 945 | #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) |
d7b360c2 XL |
946 | xfrm_tunnel_ip6ip_failed: |
947 | xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6); | |
948 | xfrm_tunnel_ipv6_failed: | |
949 | xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); | |
950 | #endif | |
f203b76d SK |
951 | xfrm_proto_comp_failed: |
952 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); | |
953 | xfrm_proto_ah_failed: | |
954 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
955 | xfrm_proto_esp_failed: | |
956 | return err; | |
957 | } | |
958 | ||
959 | static void xfrmi6_fini(void) | |
960 | { | |
0a0d93b9 | 961 | #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) |
8b404f46 | 962 | xfrm6_tunnel_deregister(&xfrmi_ip6ip_handler, AF_INET); |
d7b360c2 XL |
963 | xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6); |
964 | #endif | |
f203b76d SK |
965 | xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); |
966 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); | |
967 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
968 | } | |
969 | ||
970 | static const struct xfrm_if_cb xfrm_if_cb = { | |
971 | .decode_session = xfrmi_decode_session, | |
972 | }; | |
973 | ||
974 | static int __init xfrmi_init(void) | |
975 | { | |
976 | const char *msg; | |
977 | int err; | |
978 | ||
979 | pr_info("IPsec XFRM device driver\n"); | |
980 | ||
981 | msg = "tunnel device"; | |
982 | err = register_pernet_device(&xfrmi_net_ops); | |
983 | if (err < 0) | |
984 | goto pernet_dev_failed; | |
985 | ||
986 | msg = "xfrm4 protocols"; | |
987 | err = xfrmi4_init(); | |
988 | if (err < 0) | |
989 | goto xfrmi4_failed; | |
990 | ||
991 | msg = "xfrm6 protocols"; | |
992 | err = xfrmi6_init(); | |
993 | if (err < 0) | |
994 | goto xfrmi6_failed; | |
995 | ||
996 | ||
997 | msg = "netlink interface"; | |
998 | err = rtnl_link_register(&xfrmi_link_ops); | |
999 | if (err < 0) | |
1000 | goto rtnl_link_failed; | |
1001 | ||
1002 | xfrm_if_register_cb(&xfrm_if_cb); | |
1003 | ||
1004 | return err; | |
1005 | ||
1006 | rtnl_link_failed: | |
1007 | xfrmi6_fini(); | |
1008 | xfrmi6_failed: | |
1009 | xfrmi4_fini(); | |
1010 | xfrmi4_failed: | |
1011 | unregister_pernet_device(&xfrmi_net_ops); | |
1012 | pernet_dev_failed: | |
1013 | pr_err("xfrmi init: failed to register %s\n", msg); | |
1014 | return err; | |
1015 | } | |
1016 | ||
1017 | static void __exit xfrmi_fini(void) | |
1018 | { | |
1019 | xfrm_if_unregister_cb(); | |
1020 | rtnl_link_unregister(&xfrmi_link_ops); | |
1021 | xfrmi4_fini(); | |
1022 | xfrmi6_fini(); | |
1023 | unregister_pernet_device(&xfrmi_net_ops); | |
1024 | } | |
1025 | ||
1026 | module_init(xfrmi_init); | |
1027 | module_exit(xfrmi_fini); | |
1028 | MODULE_LICENSE("GPL"); | |
1029 | MODULE_ALIAS_RTNL_LINK("xfrm"); | |
1030 | MODULE_ALIAS_NETDEV("xfrm0"); | |
1031 | MODULE_AUTHOR("Steffen Klassert"); | |
1032 | MODULE_DESCRIPTION("XFRM virtual interface"); |