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
xfrmi_lookup(struct net * net,struct xfrm_state * x)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
xfrmi_decode_session(struct sk_buff * skb)73 static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb)
74 {
75 struct xfrmi_net *xfrmn;
76 int ifindex;
77 struct xfrm_if *xi;
78
79 if (!skb->dev)
80 return NULL;
81
82 xfrmn = net_generic(dev_net(skb->dev), xfrmi_net_id);
83 ifindex = skb->dev->ifindex;
84
85 for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
86 if (ifindex == xi->dev->ifindex &&
87 (xi->dev->flags & IFF_UP))
88 return xi;
89 }
90
91 return NULL;
92 }
93
xfrmi_link(struct xfrmi_net * xfrmn,struct xfrm_if * xi)94 static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
95 {
96 struct xfrm_if __rcu **xip = &xfrmn->xfrmi[0];
97
98 rcu_assign_pointer(xi->next , rtnl_dereference(*xip));
99 rcu_assign_pointer(*xip, xi);
100 }
101
xfrmi_unlink(struct xfrmi_net * xfrmn,struct xfrm_if * xi)102 static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
103 {
104 struct xfrm_if __rcu **xip;
105 struct xfrm_if *iter;
106
107 for (xip = &xfrmn->xfrmi[0];
108 (iter = rtnl_dereference(*xip)) != NULL;
109 xip = &iter->next) {
110 if (xi == iter) {
111 rcu_assign_pointer(*xip, xi->next);
112 break;
113 }
114 }
115 }
116
xfrmi_dev_free(struct net_device * dev)117 static void xfrmi_dev_free(struct net_device *dev)
118 {
119 struct xfrm_if *xi = netdev_priv(dev);
120
121 gro_cells_destroy(&xi->gro_cells);
122 free_percpu(dev->tstats);
123 }
124
xfrmi_create2(struct net_device * dev)125 static int xfrmi_create2(struct net_device *dev)
126 {
127 struct xfrm_if *xi = netdev_priv(dev);
128 struct net *net = dev_net(dev);
129 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
130 int err;
131
132 dev->rtnl_link_ops = &xfrmi_link_ops;
133 err = register_netdevice(dev);
134 if (err < 0)
135 goto out;
136
137 strcpy(xi->p.name, dev->name);
138
139 dev_hold(dev);
140 xfrmi_link(xfrmn, xi);
141
142 return 0;
143
144 out:
145 return err;
146 }
147
xfrmi_create(struct net * net,struct xfrm_if_parms * p)148 static struct xfrm_if *xfrmi_create(struct net *net, struct xfrm_if_parms *p)
149 {
150 struct net_device *dev;
151 struct xfrm_if *xi;
152 char name[IFNAMSIZ];
153 int err;
154
155 if (p->name[0]) {
156 strlcpy(name, p->name, IFNAMSIZ);
157 } else {
158 err = -EINVAL;
159 goto failed;
160 }
161
162 dev = alloc_netdev(sizeof(*xi), name, NET_NAME_UNKNOWN, xfrmi_dev_setup);
163 if (!dev) {
164 err = -EAGAIN;
165 goto failed;
166 }
167
168 dev_net_set(dev, net);
169
170 xi = netdev_priv(dev);
171 xi->p = *p;
172 xi->net = net;
173 xi->dev = dev;
174 xi->phydev = dev_get_by_index(net, p->link);
175 if (!xi->phydev) {
176 err = -ENODEV;
177 goto failed_free;
178 }
179
180 err = xfrmi_create2(dev);
181 if (err < 0)
182 goto failed_dev_put;
183
184 return xi;
185
186 failed_dev_put:
187 dev_put(xi->phydev);
188 failed_free:
189 free_netdev(dev);
190 failed:
191 return ERR_PTR(err);
192 }
193
xfrmi_locate(struct net * net,struct xfrm_if_parms * p,int create)194 static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p,
195 int create)
196 {
197 struct xfrm_if __rcu **xip;
198 struct xfrm_if *xi;
199 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
200
201 for (xip = &xfrmn->xfrmi[0];
202 (xi = rtnl_dereference(*xip)) != NULL;
203 xip = &xi->next) {
204 if (xi->p.if_id == p->if_id) {
205 if (create)
206 return ERR_PTR(-EEXIST);
207
208 return xi;
209 }
210 }
211 if (!create)
212 return ERR_PTR(-ENODEV);
213 return xfrmi_create(net, p);
214 }
215
xfrmi_dev_uninit(struct net_device * dev)216 static void xfrmi_dev_uninit(struct net_device *dev)
217 {
218 struct xfrm_if *xi = netdev_priv(dev);
219 struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id);
220
221 xfrmi_unlink(xfrmn, xi);
222 dev_put(xi->phydev);
223 dev_put(dev);
224 }
225
xfrmi_scrub_packet(struct sk_buff * skb,bool xnet)226 static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
227 {
228 skb->tstamp = 0;
229 skb->pkt_type = PACKET_HOST;
230 skb->skb_iif = 0;
231 skb->ignore_df = 0;
232 skb_dst_drop(skb);
233 nf_reset(skb);
234 nf_reset_trace(skb);
235
236 if (!xnet)
237 return;
238
239 ipvs_reset(skb);
240 secpath_reset(skb);
241 skb_orphan(skb);
242 skb->mark = 0;
243 }
244
xfrmi_rcv_cb(struct sk_buff * skb,int err)245 static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
246 {
247 struct pcpu_sw_netstats *tstats;
248 struct xfrm_mode *inner_mode;
249 struct net_device *dev;
250 struct xfrm_state *x;
251 struct xfrm_if *xi;
252 bool xnet;
253
254 if (err && !skb->sp)
255 return 0;
256
257 x = xfrm_input_state(skb);
258
259 xi = xfrmi_lookup(xs_net(x), x);
260 if (!xi)
261 return 1;
262
263 dev = xi->dev;
264 skb->dev = dev;
265
266 if (err) {
267 dev->stats.rx_errors++;
268 dev->stats.rx_dropped++;
269
270 return 0;
271 }
272
273 xnet = !net_eq(xi->net, dev_net(skb->dev));
274
275 if (xnet) {
276 inner_mode = x->inner_mode;
277
278 if (x->sel.family == AF_UNSPEC) {
279 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
280 if (inner_mode == NULL) {
281 XFRM_INC_STATS(dev_net(skb->dev),
282 LINUX_MIB_XFRMINSTATEMODEERROR);
283 return -EINVAL;
284 }
285 }
286
287 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb,
288 inner_mode->afinfo->family))
289 return -EPERM;
290 }
291
292 xfrmi_scrub_packet(skb, xnet);
293
294 tstats = this_cpu_ptr(dev->tstats);
295
296 u64_stats_update_begin(&tstats->syncp);
297 tstats->rx_packets++;
298 tstats->rx_bytes += skb->len;
299 u64_stats_update_end(&tstats->syncp);
300
301 return 0;
302 }
303
304 static int
xfrmi_xmit2(struct sk_buff * skb,struct net_device * dev,struct flowi * fl)305 xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
306 {
307 struct xfrm_if *xi = netdev_priv(dev);
308 struct net_device_stats *stats = &xi->dev->stats;
309 struct dst_entry *dst = skb_dst(skb);
310 unsigned int length = skb->len;
311 struct net_device *tdev;
312 struct xfrm_state *x;
313 int err = -1;
314 int mtu;
315
316 if (!dst)
317 goto tx_err_link_failure;
318
319 dst_hold(dst);
320 dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id);
321 if (IS_ERR(dst)) {
322 err = PTR_ERR(dst);
323 dst = NULL;
324 goto tx_err_link_failure;
325 }
326
327 x = dst->xfrm;
328 if (!x)
329 goto tx_err_link_failure;
330
331 if (x->if_id != xi->p.if_id)
332 goto tx_err_link_failure;
333
334 tdev = dst->dev;
335
336 if (tdev == dev) {
337 stats->collisions++;
338 net_warn_ratelimited("%s: Local routing loop detected!\n",
339 xi->p.name);
340 goto tx_err_dst_release;
341 }
342
343 mtu = dst_mtu(dst);
344 if (!skb->ignore_df && skb->len > mtu) {
345 skb_dst_update_pmtu(skb, mtu);
346
347 if (skb->protocol == htons(ETH_P_IPV6)) {
348 if (mtu < IPV6_MIN_MTU)
349 mtu = IPV6_MIN_MTU;
350
351 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
352 } else {
353 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
354 htonl(mtu));
355 }
356
357 dst_release(dst);
358 return -EMSGSIZE;
359 }
360
361 xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev)));
362 skb_dst_set(skb, dst);
363 skb->dev = tdev;
364
365 err = dst_output(xi->net, skb->sk, skb);
366 if (net_xmit_eval(err) == 0) {
367 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
368
369 u64_stats_update_begin(&tstats->syncp);
370 tstats->tx_bytes += length;
371 tstats->tx_packets++;
372 u64_stats_update_end(&tstats->syncp);
373 } else {
374 stats->tx_errors++;
375 stats->tx_aborted_errors++;
376 }
377
378 return 0;
379 tx_err_link_failure:
380 stats->tx_carrier_errors++;
381 dst_link_failure(skb);
382 tx_err_dst_release:
383 dst_release(dst);
384 return err;
385 }
386
xfrmi_xmit(struct sk_buff * skb,struct net_device * dev)387 static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev)
388 {
389 struct xfrm_if *xi = netdev_priv(dev);
390 struct net_device_stats *stats = &xi->dev->stats;
391 struct flowi fl;
392 int ret;
393
394 memset(&fl, 0, sizeof(fl));
395
396 switch (skb->protocol) {
397 case htons(ETH_P_IPV6):
398 xfrm_decode_session(skb, &fl, AF_INET6);
399 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
400 break;
401 case htons(ETH_P_IP):
402 xfrm_decode_session(skb, &fl, AF_INET);
403 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
404 break;
405 default:
406 goto tx_err;
407 }
408
409 fl.flowi_oif = xi->phydev->ifindex;
410
411 ret = xfrmi_xmit2(skb, dev, &fl);
412 if (ret < 0)
413 goto tx_err;
414
415 return NETDEV_TX_OK;
416
417 tx_err:
418 stats->tx_errors++;
419 stats->tx_dropped++;
420 kfree_skb(skb);
421 return NETDEV_TX_OK;
422 }
423
xfrmi4_err(struct sk_buff * skb,u32 info)424 static int xfrmi4_err(struct sk_buff *skb, u32 info)
425 {
426 const struct iphdr *iph = (const struct iphdr *)skb->data;
427 struct net *net = dev_net(skb->dev);
428 int protocol = iph->protocol;
429 struct ip_comp_hdr *ipch;
430 struct ip_esp_hdr *esph;
431 struct ip_auth_hdr *ah ;
432 struct xfrm_state *x;
433 struct xfrm_if *xi;
434 __be32 spi;
435
436 switch (protocol) {
437 case IPPROTO_ESP:
438 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
439 spi = esph->spi;
440 break;
441 case IPPROTO_AH:
442 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
443 spi = ah->spi;
444 break;
445 case IPPROTO_COMP:
446 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
447 spi = htonl(ntohs(ipch->cpi));
448 break;
449 default:
450 return 0;
451 }
452
453 switch (icmp_hdr(skb)->type) {
454 case ICMP_DEST_UNREACH:
455 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
456 return 0;
457 case ICMP_REDIRECT:
458 break;
459 default:
460 return 0;
461 }
462
463 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
464 spi, protocol, AF_INET);
465 if (!x)
466 return 0;
467
468 xi = xfrmi_lookup(net, x);
469 if (!xi) {
470 xfrm_state_put(x);
471 return -1;
472 }
473
474 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
475 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
476 else
477 ipv4_redirect(skb, net, 0, 0, protocol, 0);
478 xfrm_state_put(x);
479
480 return 0;
481 }
482
xfrmi6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)483 static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
484 u8 type, u8 code, int offset, __be32 info)
485 {
486 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
487 struct net *net = dev_net(skb->dev);
488 int protocol = iph->nexthdr;
489 struct ip_comp_hdr *ipch;
490 struct ip_esp_hdr *esph;
491 struct ip_auth_hdr *ah;
492 struct xfrm_state *x;
493 struct xfrm_if *xi;
494 __be32 spi;
495
496 switch (protocol) {
497 case IPPROTO_ESP:
498 esph = (struct ip_esp_hdr *)(skb->data + offset);
499 spi = esph->spi;
500 break;
501 case IPPROTO_AH:
502 ah = (struct ip_auth_hdr *)(skb->data + offset);
503 spi = ah->spi;
504 break;
505 case IPPROTO_COMP:
506 ipch = (struct ip_comp_hdr *)(skb->data + offset);
507 spi = htonl(ntohs(ipch->cpi));
508 break;
509 default:
510 return 0;
511 }
512
513 if (type != ICMPV6_PKT_TOOBIG &&
514 type != NDISC_REDIRECT)
515 return 0;
516
517 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
518 spi, protocol, AF_INET6);
519 if (!x)
520 return 0;
521
522 xi = xfrmi_lookup(net, x);
523 if (!xi) {
524 xfrm_state_put(x);
525 return -1;
526 }
527
528 if (type == NDISC_REDIRECT)
529 ip6_redirect(skb, net, skb->dev->ifindex, 0,
530 sock_net_uid(net, NULL));
531 else
532 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
533 xfrm_state_put(x);
534
535 return 0;
536 }
537
xfrmi_change(struct xfrm_if * xi,const struct xfrm_if_parms * p)538 static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p)
539 {
540 if (xi->p.link != p->link)
541 return -EINVAL;
542
543 xi->p.if_id = p->if_id;
544
545 return 0;
546 }
547
xfrmi_update(struct xfrm_if * xi,struct xfrm_if_parms * p)548 static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
549 {
550 struct net *net = dev_net(xi->dev);
551 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
552 int err;
553
554 xfrmi_unlink(xfrmn, xi);
555 synchronize_net();
556 err = xfrmi_change(xi, p);
557 xfrmi_link(xfrmn, xi);
558 netdev_state_change(xi->dev);
559 return err;
560 }
561
xfrmi_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * s)562 static void xfrmi_get_stats64(struct net_device *dev,
563 struct rtnl_link_stats64 *s)
564 {
565 int cpu;
566
567 if (!dev->tstats)
568 return;
569
570 for_each_possible_cpu(cpu) {
571 struct pcpu_sw_netstats *stats;
572 struct pcpu_sw_netstats tmp;
573 int start;
574
575 stats = per_cpu_ptr(dev->tstats, cpu);
576 do {
577 start = u64_stats_fetch_begin_irq(&stats->syncp);
578 tmp.rx_packets = stats->rx_packets;
579 tmp.rx_bytes = stats->rx_bytes;
580 tmp.tx_packets = stats->tx_packets;
581 tmp.tx_bytes = stats->tx_bytes;
582 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
583
584 s->rx_packets += tmp.rx_packets;
585 s->rx_bytes += tmp.rx_bytes;
586 s->tx_packets += tmp.tx_packets;
587 s->tx_bytes += tmp.tx_bytes;
588 }
589
590 s->rx_dropped = dev->stats.rx_dropped;
591 s->tx_dropped = dev->stats.tx_dropped;
592 }
593
xfrmi_get_iflink(const struct net_device * dev)594 static int xfrmi_get_iflink(const struct net_device *dev)
595 {
596 struct xfrm_if *xi = netdev_priv(dev);
597
598 return xi->phydev->ifindex;
599 }
600
601
602 static const struct net_device_ops xfrmi_netdev_ops = {
603 .ndo_init = xfrmi_dev_init,
604 .ndo_uninit = xfrmi_dev_uninit,
605 .ndo_start_xmit = xfrmi_xmit,
606 .ndo_get_stats64 = xfrmi_get_stats64,
607 .ndo_get_iflink = xfrmi_get_iflink,
608 };
609
xfrmi_dev_setup(struct net_device * dev)610 static void xfrmi_dev_setup(struct net_device *dev)
611 {
612 dev->netdev_ops = &xfrmi_netdev_ops;
613 dev->type = ARPHRD_NONE;
614 dev->hard_header_len = ETH_HLEN;
615 dev->min_header_len = ETH_HLEN;
616 dev->mtu = ETH_DATA_LEN;
617 dev->min_mtu = ETH_MIN_MTU;
618 dev->max_mtu = ETH_DATA_LEN;
619 dev->addr_len = ETH_ALEN;
620 dev->flags = IFF_NOARP;
621 dev->needs_free_netdev = true;
622 dev->priv_destructor = xfrmi_dev_free;
623 netif_keep_dst(dev);
624 }
625
xfrmi_dev_init(struct net_device * dev)626 static int xfrmi_dev_init(struct net_device *dev)
627 {
628 struct xfrm_if *xi = netdev_priv(dev);
629 struct net_device *phydev = xi->phydev;
630 int err;
631
632 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
633 if (!dev->tstats)
634 return -ENOMEM;
635
636 err = gro_cells_init(&xi->gro_cells, dev);
637 if (err) {
638 free_percpu(dev->tstats);
639 return err;
640 }
641
642 dev->features |= NETIF_F_LLTX;
643
644 dev->needed_headroom = phydev->needed_headroom;
645 dev->needed_tailroom = phydev->needed_tailroom;
646
647 if (is_zero_ether_addr(dev->dev_addr))
648 eth_hw_addr_inherit(dev, phydev);
649 if (is_zero_ether_addr(dev->broadcast))
650 memcpy(dev->broadcast, phydev->broadcast, dev->addr_len);
651
652 return 0;
653 }
654
xfrmi_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)655 static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
656 struct netlink_ext_ack *extack)
657 {
658 return 0;
659 }
660
xfrmi_netlink_parms(struct nlattr * data[],struct xfrm_if_parms * parms)661 static void xfrmi_netlink_parms(struct nlattr *data[],
662 struct xfrm_if_parms *parms)
663 {
664 memset(parms, 0, sizeof(*parms));
665
666 if (!data)
667 return;
668
669 if (data[IFLA_XFRM_LINK])
670 parms->link = nla_get_u32(data[IFLA_XFRM_LINK]);
671
672 if (data[IFLA_XFRM_IF_ID])
673 parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]);
674 }
675
xfrmi_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)676 static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
677 struct nlattr *tb[], struct nlattr *data[],
678 struct netlink_ext_ack *extack)
679 {
680 struct net *net = dev_net(dev);
681 struct xfrm_if_parms *p;
682 struct xfrm_if *xi;
683
684 xi = netdev_priv(dev);
685 p = &xi->p;
686
687 xfrmi_netlink_parms(data, p);
688
689 if (!tb[IFLA_IFNAME])
690 return -EINVAL;
691
692 nla_strlcpy(p->name, tb[IFLA_IFNAME], IFNAMSIZ);
693
694 xi = xfrmi_locate(net, p, 1);
695 return PTR_ERR_OR_ZERO(xi);
696 }
697
xfrmi_dellink(struct net_device * dev,struct list_head * head)698 static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
699 {
700 unregister_netdevice_queue(dev, head);
701 }
702
xfrmi_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)703 static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
704 struct nlattr *data[],
705 struct netlink_ext_ack *extack)
706 {
707 struct xfrm_if *xi = netdev_priv(dev);
708 struct net *net = dev_net(dev);
709
710 xfrmi_netlink_parms(data, &xi->p);
711
712 xi = xfrmi_locate(net, &xi->p, 0);
713
714 if (IS_ERR_OR_NULL(xi)) {
715 xi = netdev_priv(dev);
716 } else {
717 if (xi->dev != dev)
718 return -EEXIST;
719 }
720
721 return xfrmi_update(xi, &xi->p);
722 }
723
xfrmi_get_size(const struct net_device * dev)724 static size_t xfrmi_get_size(const struct net_device *dev)
725 {
726 return
727 /* IFLA_XFRM_LINK */
728 nla_total_size(4) +
729 /* IFLA_XFRM_IF_ID */
730 nla_total_size(4) +
731 0;
732 }
733
xfrmi_fill_info(struct sk_buff * skb,const struct net_device * dev)734 static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev)
735 {
736 struct xfrm_if *xi = netdev_priv(dev);
737 struct xfrm_if_parms *parm = &xi->p;
738
739 if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) ||
740 nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id))
741 goto nla_put_failure;
742 return 0;
743
744 nla_put_failure:
745 return -EMSGSIZE;
746 }
747
xfrmi_get_link_net(const struct net_device * dev)748 struct net *xfrmi_get_link_net(const struct net_device *dev)
749 {
750 struct xfrm_if *xi = netdev_priv(dev);
751
752 return dev_net(xi->phydev);
753 }
754
755 static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
756 [IFLA_XFRM_LINK] = { .type = NLA_U32 },
757 [IFLA_XFRM_IF_ID] = { .type = NLA_U32 },
758 };
759
760 static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
761 .kind = "xfrm",
762 .maxtype = IFLA_XFRM_MAX,
763 .policy = xfrmi_policy,
764 .priv_size = sizeof(struct xfrm_if),
765 .setup = xfrmi_dev_setup,
766 .validate = xfrmi_validate,
767 .newlink = xfrmi_newlink,
768 .dellink = xfrmi_dellink,
769 .changelink = xfrmi_changelink,
770 .get_size = xfrmi_get_size,
771 .fill_info = xfrmi_fill_info,
772 .get_link_net = xfrmi_get_link_net,
773 };
774
xfrmi_destroy_interfaces(struct xfrmi_net * xfrmn)775 static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn)
776 {
777 struct xfrm_if *xi;
778 LIST_HEAD(list);
779
780 xi = rtnl_dereference(xfrmn->xfrmi[0]);
781 if (!xi)
782 return;
783
784 unregister_netdevice_queue(xi->dev, &list);
785 unregister_netdevice_many(&list);
786 }
787
xfrmi_init_net(struct net * net)788 static int __net_init xfrmi_init_net(struct net *net)
789 {
790 return 0;
791 }
792
xfrmi_exit_net(struct net * net)793 static void __net_exit xfrmi_exit_net(struct net *net)
794 {
795 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
796
797 rtnl_lock();
798 xfrmi_destroy_interfaces(xfrmn);
799 rtnl_unlock();
800 }
801
802 static struct pernet_operations xfrmi_net_ops = {
803 .init = xfrmi_init_net,
804 .exit = xfrmi_exit_net,
805 .id = &xfrmi_net_id,
806 .size = sizeof(struct xfrmi_net),
807 };
808
809 static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = {
810 .handler = xfrm6_rcv,
811 .cb_handler = xfrmi_rcv_cb,
812 .err_handler = xfrmi6_err,
813 .priority = 10,
814 };
815
816 static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = {
817 .handler = xfrm6_rcv,
818 .cb_handler = xfrmi_rcv_cb,
819 .err_handler = xfrmi6_err,
820 .priority = 10,
821 };
822
823 static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = {
824 .handler = xfrm6_rcv,
825 .cb_handler = xfrmi_rcv_cb,
826 .err_handler = xfrmi6_err,
827 .priority = 10,
828 };
829
830 static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = {
831 .handler = xfrm4_rcv,
832 .input_handler = xfrm_input,
833 .cb_handler = xfrmi_rcv_cb,
834 .err_handler = xfrmi4_err,
835 .priority = 10,
836 };
837
838 static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = {
839 .handler = xfrm4_rcv,
840 .input_handler = xfrm_input,
841 .cb_handler = xfrmi_rcv_cb,
842 .err_handler = xfrmi4_err,
843 .priority = 10,
844 };
845
846 static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = {
847 .handler = xfrm4_rcv,
848 .input_handler = xfrm_input,
849 .cb_handler = xfrmi_rcv_cb,
850 .err_handler = xfrmi4_err,
851 .priority = 10,
852 };
853
xfrmi4_init(void)854 static int __init xfrmi4_init(void)
855 {
856 int err;
857
858 err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP);
859 if (err < 0)
860 goto xfrm_proto_esp_failed;
861 err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH);
862 if (err < 0)
863 goto xfrm_proto_ah_failed;
864 err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
865 if (err < 0)
866 goto xfrm_proto_comp_failed;
867
868 return 0;
869
870 xfrm_proto_comp_failed:
871 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
872 xfrm_proto_ah_failed:
873 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
874 xfrm_proto_esp_failed:
875 return err;
876 }
877
xfrmi4_fini(void)878 static void xfrmi4_fini(void)
879 {
880 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
881 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
882 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
883 }
884
xfrmi6_init(void)885 static int __init xfrmi6_init(void)
886 {
887 int err;
888
889 err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP);
890 if (err < 0)
891 goto xfrm_proto_esp_failed;
892 err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH);
893 if (err < 0)
894 goto xfrm_proto_ah_failed;
895 err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
896 if (err < 0)
897 goto xfrm_proto_comp_failed;
898
899 return 0;
900
901 xfrm_proto_comp_failed:
902 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
903 xfrm_proto_ah_failed:
904 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
905 xfrm_proto_esp_failed:
906 return err;
907 }
908
xfrmi6_fini(void)909 static void xfrmi6_fini(void)
910 {
911 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
912 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
913 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
914 }
915
916 static const struct xfrm_if_cb xfrm_if_cb = {
917 .decode_session = xfrmi_decode_session,
918 };
919
xfrmi_init(void)920 static int __init xfrmi_init(void)
921 {
922 const char *msg;
923 int err;
924
925 pr_info("IPsec XFRM device driver\n");
926
927 msg = "tunnel device";
928 err = register_pernet_device(&xfrmi_net_ops);
929 if (err < 0)
930 goto pernet_dev_failed;
931
932 msg = "xfrm4 protocols";
933 err = xfrmi4_init();
934 if (err < 0)
935 goto xfrmi4_failed;
936
937 msg = "xfrm6 protocols";
938 err = xfrmi6_init();
939 if (err < 0)
940 goto xfrmi6_failed;
941
942
943 msg = "netlink interface";
944 err = rtnl_link_register(&xfrmi_link_ops);
945 if (err < 0)
946 goto rtnl_link_failed;
947
948 xfrm_if_register_cb(&xfrm_if_cb);
949
950 return err;
951
952 rtnl_link_failed:
953 xfrmi6_fini();
954 xfrmi6_failed:
955 xfrmi4_fini();
956 xfrmi4_failed:
957 unregister_pernet_device(&xfrmi_net_ops);
958 pernet_dev_failed:
959 pr_err("xfrmi init: failed to register %s\n", msg);
960 return err;
961 }
962
xfrmi_fini(void)963 static void __exit xfrmi_fini(void)
964 {
965 xfrm_if_unregister_cb();
966 rtnl_link_unregister(&xfrmi_link_ops);
967 xfrmi4_fini();
968 xfrmi6_fini();
969 unregister_pernet_device(&xfrmi_net_ops);
970 }
971
972 module_init(xfrmi_init);
973 module_exit(xfrmi_fini);
974 MODULE_LICENSE("GPL");
975 MODULE_ALIAS_RTNL_LINK("xfrm");
976 MODULE_ALIAS_NETDEV("xfrm0");
977 MODULE_AUTHOR("Steffen Klassert");
978 MODULE_DESCRIPTION("XFRM virtual interface");
979
