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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> | |
40 | #include <net/addrconf.h> | |
41 | #include <net/xfrm.h> | |
42 | #include <net/net_namespace.h> | |
43 | #include <net/netns/generic.h> | |
44 | #include <linux/etherdevice.h> | |
45 | ||
46 | static int xfrmi_dev_init(struct net_device *dev); | |
47 | static void xfrmi_dev_setup(struct net_device *dev); | |
48 | static struct rtnl_link_ops xfrmi_link_ops __read_mostly; | |
49 | static unsigned int xfrmi_net_id __read_mostly; | |
50 | ||
51 | struct xfrmi_net { | |
52 | /* lists for storing interfaces in use */ | |
53 | struct xfrm_if __rcu *xfrmi[1]; | |
54 | }; | |
55 | ||
56 | #define for_each_xfrmi_rcu(start, xi) \ | |
57 | for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next)) | |
58 | ||
59 | static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x) | |
60 | { | |
61 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
62 | struct xfrm_if *xi; | |
63 | ||
64 | for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) { | |
65 | if (x->if_id == xi->p.if_id && | |
66 | (xi->dev->flags & IFF_UP)) | |
67 | return xi; | |
68 | } | |
69 | ||
70 | return NULL; | |
71 | } | |
72 | ||
025c65e1 MW |
73 | static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb, |
74 | unsigned short family) | |
f203b76d SK |
75 | { |
76 | struct xfrmi_net *xfrmn; | |
f203b76d | 77 | struct xfrm_if *xi; |
025c65e1 | 78 | int ifindex = 0; |
f203b76d | 79 | |
660899dd | 80 | if (!secpath_exists(skb) || !skb->dev) |
f203b76d SK |
81 | return NULL; |
82 | ||
025c65e1 MW |
83 | switch (family) { |
84 | case AF_INET6: | |
85 | ifindex = inet6_sdif(skb); | |
86 | break; | |
87 | case AF_INET: | |
88 | ifindex = inet_sdif(skb); | |
89 | break; | |
90 | } | |
91 | if (!ifindex) | |
92 | ifindex = skb->dev->ifindex; | |
93 | ||
660899dd | 94 | xfrmn = net_generic(xs_net(xfrm_input_state(skb)), xfrmi_net_id); |
f203b76d SK |
95 | |
96 | for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) { | |
97 | if (ifindex == xi->dev->ifindex && | |
98 | (xi->dev->flags & IFF_UP)) | |
99 | return xi; | |
100 | } | |
101 | ||
102 | return NULL; | |
103 | } | |
104 | ||
105 | static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi) | |
106 | { | |
107 | struct xfrm_if __rcu **xip = &xfrmn->xfrmi[0]; | |
108 | ||
109 | rcu_assign_pointer(xi->next , rtnl_dereference(*xip)); | |
110 | rcu_assign_pointer(*xip, xi); | |
111 | } | |
112 | ||
113 | static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi) | |
114 | { | |
115 | struct xfrm_if __rcu **xip; | |
116 | struct xfrm_if *iter; | |
117 | ||
118 | for (xip = &xfrmn->xfrmi[0]; | |
119 | (iter = rtnl_dereference(*xip)) != NULL; | |
120 | xip = &iter->next) { | |
121 | if (xi == iter) { | |
122 | rcu_assign_pointer(*xip, xi->next); | |
123 | break; | |
124 | } | |
125 | } | |
126 | } | |
127 | ||
128 | static void xfrmi_dev_free(struct net_device *dev) | |
129 | { | |
4da40259 LR |
130 | struct xfrm_if *xi = netdev_priv(dev); |
131 | ||
132 | gro_cells_destroy(&xi->gro_cells); | |
f203b76d SK |
133 | free_percpu(dev->tstats); |
134 | } | |
135 | ||
56c5ee1a | 136 | static int xfrmi_create(struct net_device *dev) |
f203b76d SK |
137 | { |
138 | struct xfrm_if *xi = netdev_priv(dev); | |
139 | struct net *net = dev_net(dev); | |
140 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
141 | int err; | |
142 | ||
143 | dev->rtnl_link_ops = &xfrmi_link_ops; | |
144 | err = register_netdevice(dev); | |
145 | if (err < 0) | |
146 | goto out; | |
147 | ||
148 | strcpy(xi->p.name, dev->name); | |
149 | ||
150 | dev_hold(dev); | |
151 | xfrmi_link(xfrmn, xi); | |
152 | ||
153 | return 0; | |
154 | ||
155 | out: | |
156 | return err; | |
157 | } | |
158 | ||
56c5ee1a | 159 | static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p) |
f203b76d SK |
160 | { |
161 | struct xfrm_if __rcu **xip; | |
162 | struct xfrm_if *xi; | |
163 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
164 | ||
165 | for (xip = &xfrmn->xfrmi[0]; | |
166 | (xi = rtnl_dereference(*xip)) != NULL; | |
56c5ee1a ND |
167 | xip = &xi->next) |
168 | if (xi->p.if_id == p->if_id) | |
f203b76d | 169 | return xi; |
56c5ee1a ND |
170 | |
171 | return NULL; | |
f203b76d SK |
172 | } |
173 | ||
174 | static void xfrmi_dev_uninit(struct net_device *dev) | |
175 | { | |
176 | struct xfrm_if *xi = netdev_priv(dev); | |
177 | struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id); | |
178 | ||
179 | xfrmi_unlink(xfrmn, xi); | |
180 | dev_put(xi->phydev); | |
181 | dev_put(dev); | |
182 | } | |
183 | ||
184 | static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet) | |
185 | { | |
186 | skb->tstamp = 0; | |
187 | skb->pkt_type = PACKET_HOST; | |
188 | skb->skb_iif = 0; | |
189 | skb->ignore_df = 0; | |
190 | skb_dst_drop(skb); | |
191 | nf_reset(skb); | |
192 | nf_reset_trace(skb); | |
193 | ||
194 | if (!xnet) | |
195 | return; | |
196 | ||
197 | ipvs_reset(skb); | |
198 | secpath_reset(skb); | |
199 | skb_orphan(skb); | |
200 | skb->mark = 0; | |
201 | } | |
202 | ||
203 | static int xfrmi_rcv_cb(struct sk_buff *skb, int err) | |
204 | { | |
4c145dce | 205 | const struct xfrm_mode *inner_mode; |
f203b76d | 206 | struct pcpu_sw_netstats *tstats; |
f203b76d SK |
207 | struct net_device *dev; |
208 | struct xfrm_state *x; | |
209 | struct xfrm_if *xi; | |
210 | bool xnet; | |
211 | ||
26912e37 | 212 | if (err && !secpath_exists(skb)) |
f203b76d SK |
213 | return 0; |
214 | ||
215 | x = xfrm_input_state(skb); | |
216 | ||
217 | xi = xfrmi_lookup(xs_net(x), x); | |
218 | if (!xi) | |
219 | return 1; | |
220 | ||
221 | dev = xi->dev; | |
222 | skb->dev = dev; | |
223 | ||
224 | if (err) { | |
225 | dev->stats.rx_errors++; | |
226 | dev->stats.rx_dropped++; | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | xnet = !net_eq(xi->net, dev_net(skb->dev)); | |
232 | ||
233 | if (xnet) { | |
c9500d7b | 234 | inner_mode = &x->inner_mode; |
f203b76d SK |
235 | |
236 | if (x->sel.family == AF_UNSPEC) { | |
237 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
238 | if (inner_mode == NULL) { | |
239 | XFRM_INC_STATS(dev_net(skb->dev), | |
240 | LINUX_MIB_XFRMINSTATEMODEERROR); | |
241 | return -EINVAL; | |
242 | } | |
243 | } | |
244 | ||
245 | if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, | |
b45714b1 | 246 | inner_mode->family)) |
f203b76d SK |
247 | return -EPERM; |
248 | } | |
249 | ||
250 | xfrmi_scrub_packet(skb, xnet); | |
251 | ||
252 | tstats = this_cpu_ptr(dev->tstats); | |
253 | ||
254 | u64_stats_update_begin(&tstats->syncp); | |
255 | tstats->rx_packets++; | |
256 | tstats->rx_bytes += skb->len; | |
257 | u64_stats_update_end(&tstats->syncp); | |
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 | ||
274 | if (!dst) | |
275 | goto tx_err_link_failure; | |
276 | ||
f203b76d | 277 | dst_hold(dst); |
bc56b334 | 278 | dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id); |
f203b76d SK |
279 | if (IS_ERR(dst)) { |
280 | err = PTR_ERR(dst); | |
281 | dst = NULL; | |
282 | goto tx_err_link_failure; | |
283 | } | |
284 | ||
285 | x = dst->xfrm; | |
286 | if (!x) | |
287 | goto tx_err_link_failure; | |
288 | ||
289 | if (x->if_id != xi->p.if_id) | |
290 | goto tx_err_link_failure; | |
291 | ||
292 | tdev = dst->dev; | |
293 | ||
294 | if (tdev == dev) { | |
295 | stats->collisions++; | |
296 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
297 | xi->p.name); | |
298 | goto tx_err_dst_release; | |
299 | } | |
300 | ||
301 | mtu = dst_mtu(dst); | |
302 | if (!skb->ignore_df && skb->len > mtu) { | |
303 | skb_dst_update_pmtu(skb, mtu); | |
304 | ||
305 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
306 | if (mtu < IPV6_MIN_MTU) | |
307 | mtu = IPV6_MIN_MTU; | |
308 | ||
309 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
310 | } else { | |
311 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
312 | htonl(mtu)); | |
313 | } | |
314 | ||
315 | dst_release(dst); | |
316 | return -EMSGSIZE; | |
317 | } | |
318 | ||
319 | xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev))); | |
320 | skb_dst_set(skb, dst); | |
321 | skb->dev = tdev; | |
322 | ||
323 | err = dst_output(xi->net, skb->sk, skb); | |
324 | if (net_xmit_eval(err) == 0) { | |
325 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); | |
326 | ||
327 | u64_stats_update_begin(&tstats->syncp); | |
328 | tstats->tx_bytes += length; | |
329 | tstats->tx_packets++; | |
330 | u64_stats_update_end(&tstats->syncp); | |
331 | } else { | |
332 | stats->tx_errors++; | |
333 | stats->tx_aborted_errors++; | |
334 | } | |
335 | ||
336 | return 0; | |
337 | tx_err_link_failure: | |
338 | stats->tx_carrier_errors++; | |
339 | dst_link_failure(skb); | |
340 | tx_err_dst_release: | |
341 | dst_release(dst); | |
342 | return err; | |
343 | } | |
344 | ||
345 | static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev) | |
346 | { | |
347 | struct xfrm_if *xi = netdev_priv(dev); | |
348 | struct net_device_stats *stats = &xi->dev->stats; | |
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))); | |
358 | break; | |
359 | case htons(ETH_P_IP): | |
360 | xfrm_decode_session(skb, &fl, AF_INET); | |
361 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
362 | break; | |
363 | default: | |
364 | goto tx_err; | |
365 | } | |
366 | ||
367 | fl.flowi_oif = xi->phydev->ifindex; | |
368 | ||
369 | ret = xfrmi_xmit2(skb, dev, &fl); | |
370 | if (ret < 0) | |
371 | goto tx_err; | |
372 | ||
373 | return NETDEV_TX_OK; | |
374 | ||
375 | tx_err: | |
376 | stats->tx_errors++; | |
377 | stats->tx_dropped++; | |
378 | kfree_skb(skb); | |
379 | return NETDEV_TX_OK; | |
380 | } | |
381 | ||
382 | static int xfrmi4_err(struct sk_buff *skb, u32 info) | |
383 | { | |
384 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
385 | struct net *net = dev_net(skb->dev); | |
386 | int protocol = iph->protocol; | |
387 | struct ip_comp_hdr *ipch; | |
388 | struct ip_esp_hdr *esph; | |
389 | struct ip_auth_hdr *ah ; | |
390 | struct xfrm_state *x; | |
391 | struct xfrm_if *xi; | |
392 | __be32 spi; | |
393 | ||
394 | switch (protocol) { | |
395 | case IPPROTO_ESP: | |
396 | esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); | |
397 | spi = esph->spi; | |
398 | break; | |
399 | case IPPROTO_AH: | |
400 | ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); | |
401 | spi = ah->spi; | |
402 | break; | |
403 | case IPPROTO_COMP: | |
404 | ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); | |
405 | spi = htonl(ntohs(ipch->cpi)); | |
406 | break; | |
407 | default: | |
408 | return 0; | |
409 | } | |
410 | ||
411 | switch (icmp_hdr(skb)->type) { | |
412 | case ICMP_DEST_UNREACH: | |
413 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) | |
414 | return 0; | |
415 | case ICMP_REDIRECT: | |
416 | break; | |
417 | default: | |
418 | return 0; | |
419 | } | |
420 | ||
421 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, | |
422 | spi, protocol, AF_INET); | |
423 | if (!x) | |
424 | return 0; | |
425 | ||
426 | xi = xfrmi_lookup(net, x); | |
427 | if (!xi) { | |
428 | xfrm_state_put(x); | |
429 | return -1; | |
430 | } | |
431 | ||
432 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) | |
d888f396 | 433 | ipv4_update_pmtu(skb, net, info, 0, protocol); |
f203b76d | 434 | else |
1042caa7 | 435 | ipv4_redirect(skb, net, 0, protocol); |
f203b76d SK |
436 | xfrm_state_put(x); |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
441 | static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
442 | u8 type, u8 code, int offset, __be32 info) | |
443 | { | |
444 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; | |
445 | struct net *net = dev_net(skb->dev); | |
446 | int protocol = iph->nexthdr; | |
447 | struct ip_comp_hdr *ipch; | |
448 | struct ip_esp_hdr *esph; | |
449 | struct ip_auth_hdr *ah; | |
450 | struct xfrm_state *x; | |
451 | struct xfrm_if *xi; | |
452 | __be32 spi; | |
453 | ||
454 | switch (protocol) { | |
455 | case IPPROTO_ESP: | |
456 | esph = (struct ip_esp_hdr *)(skb->data + offset); | |
457 | spi = esph->spi; | |
458 | break; | |
459 | case IPPROTO_AH: | |
460 | ah = (struct ip_auth_hdr *)(skb->data + offset); | |
461 | spi = ah->spi; | |
462 | break; | |
463 | case IPPROTO_COMP: | |
464 | ipch = (struct ip_comp_hdr *)(skb->data + offset); | |
465 | spi = htonl(ntohs(ipch->cpi)); | |
466 | break; | |
467 | default: | |
468 | return 0; | |
469 | } | |
470 | ||
471 | if (type != ICMPV6_PKT_TOOBIG && | |
472 | type != NDISC_REDIRECT) | |
473 | return 0; | |
474 | ||
475 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, | |
476 | spi, protocol, AF_INET6); | |
477 | if (!x) | |
478 | return 0; | |
479 | ||
480 | xi = xfrmi_lookup(net, x); | |
481 | if (!xi) { | |
482 | xfrm_state_put(x); | |
483 | return -1; | |
484 | } | |
485 | ||
486 | if (type == NDISC_REDIRECT) | |
487 | ip6_redirect(skb, net, skb->dev->ifindex, 0, | |
488 | sock_net_uid(net, NULL)); | |
489 | else | |
490 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); | |
491 | xfrm_state_put(x); | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
496 | static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p) | |
497 | { | |
498 | if (xi->p.link != p->link) | |
499 | return -EINVAL; | |
500 | ||
501 | xi->p.if_id = p->if_id; | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p) | |
507 | { | |
508 | struct net *net = dev_net(xi->dev); | |
509 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
510 | int err; | |
511 | ||
512 | xfrmi_unlink(xfrmn, xi); | |
513 | synchronize_net(); | |
514 | err = xfrmi_change(xi, p); | |
515 | xfrmi_link(xfrmn, xi); | |
516 | netdev_state_change(xi->dev); | |
517 | return err; | |
518 | } | |
519 | ||
520 | static void xfrmi_get_stats64(struct net_device *dev, | |
521 | struct rtnl_link_stats64 *s) | |
522 | { | |
523 | int cpu; | |
524 | ||
f203b76d SK |
525 | for_each_possible_cpu(cpu) { |
526 | struct pcpu_sw_netstats *stats; | |
527 | struct pcpu_sw_netstats tmp; | |
528 | int start; | |
529 | ||
530 | stats = per_cpu_ptr(dev->tstats, cpu); | |
531 | do { | |
532 | start = u64_stats_fetch_begin_irq(&stats->syncp); | |
533 | tmp.rx_packets = stats->rx_packets; | |
534 | tmp.rx_bytes = stats->rx_bytes; | |
535 | tmp.tx_packets = stats->tx_packets; | |
536 | tmp.tx_bytes = stats->tx_bytes; | |
537 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); | |
538 | ||
539 | s->rx_packets += tmp.rx_packets; | |
540 | s->rx_bytes += tmp.rx_bytes; | |
541 | s->tx_packets += tmp.tx_packets; | |
542 | s->tx_bytes += tmp.tx_bytes; | |
543 | } | |
544 | ||
545 | s->rx_dropped = dev->stats.rx_dropped; | |
546 | s->tx_dropped = dev->stats.tx_dropped; | |
547 | } | |
548 | ||
549 | static int xfrmi_get_iflink(const struct net_device *dev) | |
550 | { | |
551 | struct xfrm_if *xi = netdev_priv(dev); | |
552 | ||
553 | return xi->phydev->ifindex; | |
554 | } | |
555 | ||
556 | ||
557 | static const struct net_device_ops xfrmi_netdev_ops = { | |
558 | .ndo_init = xfrmi_dev_init, | |
559 | .ndo_uninit = xfrmi_dev_uninit, | |
560 | .ndo_start_xmit = xfrmi_xmit, | |
561 | .ndo_get_stats64 = xfrmi_get_stats64, | |
562 | .ndo_get_iflink = xfrmi_get_iflink, | |
563 | }; | |
564 | ||
565 | static void xfrmi_dev_setup(struct net_device *dev) | |
566 | { | |
567 | dev->netdev_ops = &xfrmi_netdev_ops; | |
568 | dev->type = ARPHRD_NONE; | |
569 | dev->hard_header_len = ETH_HLEN; | |
570 | dev->min_header_len = ETH_HLEN; | |
571 | dev->mtu = ETH_DATA_LEN; | |
572 | dev->min_mtu = ETH_MIN_MTU; | |
573 | dev->max_mtu = ETH_DATA_LEN; | |
574 | dev->addr_len = ETH_ALEN; | |
575 | dev->flags = IFF_NOARP; | |
576 | dev->needs_free_netdev = true; | |
577 | dev->priv_destructor = xfrmi_dev_free; | |
578 | netif_keep_dst(dev); | |
579 | } | |
580 | ||
581 | static int xfrmi_dev_init(struct net_device *dev) | |
582 | { | |
583 | struct xfrm_if *xi = netdev_priv(dev); | |
584 | struct net_device *phydev = xi->phydev; | |
585 | int err; | |
586 | ||
587 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
588 | if (!dev->tstats) | |
589 | return -ENOMEM; | |
590 | ||
591 | err = gro_cells_init(&xi->gro_cells, dev); | |
592 | if (err) { | |
593 | free_percpu(dev->tstats); | |
594 | return err; | |
595 | } | |
596 | ||
597 | dev->features |= NETIF_F_LLTX; | |
598 | ||
599 | dev->needed_headroom = phydev->needed_headroom; | |
600 | dev->needed_tailroom = phydev->needed_tailroom; | |
601 | ||
602 | if (is_zero_ether_addr(dev->dev_addr)) | |
603 | eth_hw_addr_inherit(dev, phydev); | |
604 | if (is_zero_ether_addr(dev->broadcast)) | |
605 | memcpy(dev->broadcast, phydev->broadcast, dev->addr_len); | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
610 | static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[], | |
611 | struct netlink_ext_ack *extack) | |
612 | { | |
613 | return 0; | |
614 | } | |
615 | ||
616 | static void xfrmi_netlink_parms(struct nlattr *data[], | |
617 | struct xfrm_if_parms *parms) | |
618 | { | |
619 | memset(parms, 0, sizeof(*parms)); | |
620 | ||
621 | if (!data) | |
622 | return; | |
623 | ||
624 | if (data[IFLA_XFRM_LINK]) | |
625 | parms->link = nla_get_u32(data[IFLA_XFRM_LINK]); | |
626 | ||
627 | if (data[IFLA_XFRM_IF_ID]) | |
628 | parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]); | |
629 | } | |
630 | ||
631 | static int xfrmi_newlink(struct net *src_net, struct net_device *dev, | |
632 | struct nlattr *tb[], struct nlattr *data[], | |
633 | struct netlink_ext_ack *extack) | |
634 | { | |
635 | struct net *net = dev_net(dev); | |
56c5ee1a | 636 | struct xfrm_if_parms p; |
f203b76d | 637 | struct xfrm_if *xi; |
56c5ee1a | 638 | int err; |
f203b76d | 639 | |
56c5ee1a | 640 | xfrmi_netlink_parms(data, &p); |
f203b76d SK |
641 | |
642 | if (!tb[IFLA_IFNAME]) | |
643 | return -EINVAL; | |
644 | ||
56c5ee1a | 645 | nla_strlcpy(p.name, tb[IFLA_IFNAME], IFNAMSIZ); |
f203b76d | 646 | |
56c5ee1a ND |
647 | xi = xfrmi_locate(net, &p); |
648 | if (xi) | |
649 | return -EEXIST; | |
650 | ||
651 | xi = netdev_priv(dev); | |
652 | xi->p = p; | |
653 | xi->net = net; | |
654 | xi->dev = dev; | |
655 | xi->phydev = dev_get_by_index(net, p.link); | |
656 | if (!xi->phydev) | |
657 | return -ENODEV; | |
658 | ||
659 | err = xfrmi_create(dev); | |
660 | if (err < 0) | |
661 | dev_put(xi->phydev); | |
662 | return err; | |
f203b76d SK |
663 | } |
664 | ||
665 | static void xfrmi_dellink(struct net_device *dev, struct list_head *head) | |
666 | { | |
667 | unregister_netdevice_queue(dev, head); | |
668 | } | |
669 | ||
670 | static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], | |
671 | struct nlattr *data[], | |
672 | struct netlink_ext_ack *extack) | |
673 | { | |
674 | struct xfrm_if *xi = netdev_priv(dev); | |
675 | struct net *net = dev_net(dev); | |
676 | ||
677 | xfrmi_netlink_parms(data, &xi->p); | |
678 | ||
56c5ee1a ND |
679 | xi = xfrmi_locate(net, &xi->p); |
680 | if (!xi) { | |
44e2b838 BW |
681 | xi = netdev_priv(dev); |
682 | } else { | |
f203b76d SK |
683 | if (xi->dev != dev) |
684 | return -EEXIST; | |
44e2b838 | 685 | } |
f203b76d SK |
686 | |
687 | return xfrmi_update(xi, &xi->p); | |
688 | } | |
689 | ||
690 | static size_t xfrmi_get_size(const struct net_device *dev) | |
691 | { | |
692 | return | |
693 | /* IFLA_XFRM_LINK */ | |
694 | nla_total_size(4) + | |
695 | /* IFLA_XFRM_IF_ID */ | |
696 | nla_total_size(4) + | |
697 | 0; | |
698 | } | |
699 | ||
700 | static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
701 | { | |
702 | struct xfrm_if *xi = netdev_priv(dev); | |
703 | struct xfrm_if_parms *parm = &xi->p; | |
704 | ||
705 | if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) || | |
706 | nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id)) | |
707 | goto nla_put_failure; | |
708 | return 0; | |
709 | ||
710 | nla_put_failure: | |
711 | return -EMSGSIZE; | |
712 | } | |
713 | ||
211d6f2d | 714 | static struct net *xfrmi_get_link_net(const struct net_device *dev) |
f203b76d SK |
715 | { |
716 | struct xfrm_if *xi = netdev_priv(dev); | |
717 | ||
718 | return dev_net(xi->phydev); | |
719 | } | |
720 | ||
721 | static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = { | |
722 | [IFLA_XFRM_LINK] = { .type = NLA_U32 }, | |
723 | [IFLA_XFRM_IF_ID] = { .type = NLA_U32 }, | |
724 | }; | |
725 | ||
726 | static struct rtnl_link_ops xfrmi_link_ops __read_mostly = { | |
727 | .kind = "xfrm", | |
728 | .maxtype = IFLA_XFRM_MAX, | |
729 | .policy = xfrmi_policy, | |
730 | .priv_size = sizeof(struct xfrm_if), | |
731 | .setup = xfrmi_dev_setup, | |
732 | .validate = xfrmi_validate, | |
733 | .newlink = xfrmi_newlink, | |
734 | .dellink = xfrmi_dellink, | |
735 | .changelink = xfrmi_changelink, | |
736 | .get_size = xfrmi_get_size, | |
737 | .fill_info = xfrmi_fill_info, | |
738 | .get_link_net = xfrmi_get_link_net, | |
739 | }; | |
740 | ||
741 | static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn) | |
742 | { | |
743 | struct xfrm_if *xi; | |
744 | LIST_HEAD(list); | |
745 | ||
746 | xi = rtnl_dereference(xfrmn->xfrmi[0]); | |
747 | if (!xi) | |
748 | return; | |
749 | ||
750 | unregister_netdevice_queue(xi->dev, &list); | |
751 | unregister_netdevice_many(&list); | |
752 | } | |
753 | ||
f203b76d SK |
754 | static void __net_exit xfrmi_exit_net(struct net *net) |
755 | { | |
756 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
757 | ||
758 | rtnl_lock(); | |
759 | xfrmi_destroy_interfaces(xfrmn); | |
760 | rtnl_unlock(); | |
761 | } | |
762 | ||
763 | static struct pernet_operations xfrmi_net_ops = { | |
f203b76d SK |
764 | .exit = xfrmi_exit_net, |
765 | .id = &xfrmi_net_id, | |
766 | .size = sizeof(struct xfrmi_net), | |
767 | }; | |
768 | ||
769 | static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = { | |
770 | .handler = xfrm6_rcv, | |
771 | .cb_handler = xfrmi_rcv_cb, | |
772 | .err_handler = xfrmi6_err, | |
773 | .priority = 10, | |
774 | }; | |
775 | ||
776 | static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = { | |
777 | .handler = xfrm6_rcv, | |
778 | .cb_handler = xfrmi_rcv_cb, | |
779 | .err_handler = xfrmi6_err, | |
780 | .priority = 10, | |
781 | }; | |
782 | ||
783 | static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = { | |
784 | .handler = xfrm6_rcv, | |
785 | .cb_handler = xfrmi_rcv_cb, | |
786 | .err_handler = xfrmi6_err, | |
787 | .priority = 10, | |
788 | }; | |
789 | ||
790 | static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = { | |
791 | .handler = xfrm4_rcv, | |
792 | .input_handler = xfrm_input, | |
793 | .cb_handler = xfrmi_rcv_cb, | |
794 | .err_handler = xfrmi4_err, | |
795 | .priority = 10, | |
796 | }; | |
797 | ||
798 | static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = { | |
799 | .handler = xfrm4_rcv, | |
800 | .input_handler = xfrm_input, | |
801 | .cb_handler = xfrmi_rcv_cb, | |
802 | .err_handler = xfrmi4_err, | |
803 | .priority = 10, | |
804 | }; | |
805 | ||
806 | static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = { | |
807 | .handler = xfrm4_rcv, | |
808 | .input_handler = xfrm_input, | |
809 | .cb_handler = xfrmi_rcv_cb, | |
810 | .err_handler = xfrmi4_err, | |
811 | .priority = 10, | |
812 | }; | |
813 | ||
814 | static int __init xfrmi4_init(void) | |
815 | { | |
816 | int err; | |
817 | ||
818 | err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
819 | if (err < 0) | |
820 | goto xfrm_proto_esp_failed; | |
821 | err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH); | |
822 | if (err < 0) | |
823 | goto xfrm_proto_ah_failed; | |
824 | err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); | |
825 | if (err < 0) | |
826 | goto xfrm_proto_comp_failed; | |
827 | ||
828 | return 0; | |
829 | ||
830 | xfrm_proto_comp_failed: | |
831 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); | |
832 | xfrm_proto_ah_failed: | |
833 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
834 | xfrm_proto_esp_failed: | |
835 | return err; | |
836 | } | |
837 | ||
838 | static void xfrmi4_fini(void) | |
839 | { | |
840 | xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); | |
841 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); | |
842 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
843 | } | |
844 | ||
845 | static int __init xfrmi6_init(void) | |
846 | { | |
847 | int err; | |
848 | ||
849 | err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
850 | if (err < 0) | |
851 | goto xfrm_proto_esp_failed; | |
852 | err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH); | |
853 | if (err < 0) | |
854 | goto xfrm_proto_ah_failed; | |
855 | err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); | |
856 | if (err < 0) | |
857 | goto xfrm_proto_comp_failed; | |
858 | ||
859 | return 0; | |
860 | ||
861 | xfrm_proto_comp_failed: | |
862 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); | |
863 | xfrm_proto_ah_failed: | |
864 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
865 | xfrm_proto_esp_failed: | |
866 | return err; | |
867 | } | |
868 | ||
869 | static void xfrmi6_fini(void) | |
870 | { | |
871 | xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); | |
872 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); | |
873 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
874 | } | |
875 | ||
876 | static const struct xfrm_if_cb xfrm_if_cb = { | |
877 | .decode_session = xfrmi_decode_session, | |
878 | }; | |
879 | ||
880 | static int __init xfrmi_init(void) | |
881 | { | |
882 | const char *msg; | |
883 | int err; | |
884 | ||
885 | pr_info("IPsec XFRM device driver\n"); | |
886 | ||
887 | msg = "tunnel device"; | |
888 | err = register_pernet_device(&xfrmi_net_ops); | |
889 | if (err < 0) | |
890 | goto pernet_dev_failed; | |
891 | ||
892 | msg = "xfrm4 protocols"; | |
893 | err = xfrmi4_init(); | |
894 | if (err < 0) | |
895 | goto xfrmi4_failed; | |
896 | ||
897 | msg = "xfrm6 protocols"; | |
898 | err = xfrmi6_init(); | |
899 | if (err < 0) | |
900 | goto xfrmi6_failed; | |
901 | ||
902 | ||
903 | msg = "netlink interface"; | |
904 | err = rtnl_link_register(&xfrmi_link_ops); | |
905 | if (err < 0) | |
906 | goto rtnl_link_failed; | |
907 | ||
908 | xfrm_if_register_cb(&xfrm_if_cb); | |
909 | ||
910 | return err; | |
911 | ||
912 | rtnl_link_failed: | |
913 | xfrmi6_fini(); | |
914 | xfrmi6_failed: | |
915 | xfrmi4_fini(); | |
916 | xfrmi4_failed: | |
917 | unregister_pernet_device(&xfrmi_net_ops); | |
918 | pernet_dev_failed: | |
919 | pr_err("xfrmi init: failed to register %s\n", msg); | |
920 | return err; | |
921 | } | |
922 | ||
923 | static void __exit xfrmi_fini(void) | |
924 | { | |
925 | xfrm_if_unregister_cb(); | |
926 | rtnl_link_unregister(&xfrmi_link_ops); | |
927 | xfrmi4_fini(); | |
928 | xfrmi6_fini(); | |
929 | unregister_pernet_device(&xfrmi_net_ops); | |
930 | } | |
931 | ||
932 | module_init(xfrmi_init); | |
933 | module_exit(xfrmi_fini); | |
934 | MODULE_LICENSE("GPL"); | |
935 | MODULE_ALIAS_RTNL_LINK("xfrm"); | |
936 | MODULE_ALIAS_NETDEV("xfrm0"); | |
937 | MODULE_AUTHOR("Steffen Klassert"); | |
938 | MODULE_DESCRIPTION("XFRM virtual interface"); |