blob: 4420c8fd318a67b3f2004cc3fae59b3cdc1657b9 [file] [log] [blame]
Andrew Scullb4b6d4a2019-01-02 15:54:55 +00001// 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>
Olivier Deprez157378f2022-04-04 15:47:50 +020040#include <net/ip_tunnels.h>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000041#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
47static int xfrmi_dev_init(struct net_device *dev);
48static void xfrmi_dev_setup(struct net_device *dev);
49static struct rtnl_link_ops xfrmi_link_ops __read_mostly;
50static unsigned int xfrmi_net_id __read_mostly;
Olivier Deprez157378f2022-04-04 15:47:50 +020051static const struct net_device_ops xfrmi_netdev_ops;
52
53#define XFRMI_HASH_BITS 8
54#define XFRMI_HASH_SIZE BIT(XFRMI_HASH_BITS)
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000055
56struct xfrmi_net {
57 /* lists for storing interfaces in use */
Olivier Deprez157378f2022-04-04 15:47:50 +020058 struct xfrm_if __rcu *xfrmi[XFRMI_HASH_SIZE];
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000059};
60
61#define for_each_xfrmi_rcu(start, xi) \
62 for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next))
63
Olivier Deprez157378f2022-04-04 15:47:50 +020064static u32 xfrmi_hash(u32 if_id)
65{
66 return hash_32(if_id, XFRMI_HASH_BITS);
67}
68
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000069static 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
Olivier Deprez157378f2022-04-04 15:47:50 +020074 for_each_xfrmi_rcu(xfrmn->xfrmi[xfrmi_hash(x->if_id)], xi) {
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000075 if (x->if_id == xi->p.if_id &&
76 (xi->dev->flags & IFF_UP))
77 return xi;
78 }
79
80 return NULL;
81}
82
David Brazdil0f672f62019-12-10 10:32:29 +000083static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb,
84 unsigned short family)
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000085{
Olivier Deprez157378f2022-04-04 15:47:50 +020086 struct net_device *dev;
David Brazdil0f672f62019-12-10 10:32:29 +000087 int ifindex = 0;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000088
David Brazdil0f672f62019-12-10 10:32:29 +000089 if (!secpath_exists(skb) || !skb->dev)
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000090 return NULL;
91
David Brazdil0f672f62019-12-10 10:32:29 +000092 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 }
David Brazdil0f672f62019-12-10 10:32:29 +0000100
Olivier Deprez157378f2022-04-04 15:47:50 +0200101 if (ifindex) {
102 struct net *net = xs_net(xfrm_input_state(skb));
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000103
Olivier Deprez157378f2022-04-04 15:47:50 +0200104 dev = dev_get_by_index_rcu(net, ifindex);
105 } else {
106 dev = skb->dev;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000107 }
108
Olivier Deprez157378f2022-04-04 15:47:50 +0200109 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);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000115}
116
117static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
118{
Olivier Deprez157378f2022-04-04 15:47:50 +0200119 struct xfrm_if __rcu **xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)];
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000120
121 rcu_assign_pointer(xi->next , rtnl_dereference(*xip));
122 rcu_assign_pointer(*xip, xi);
123}
124
125static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
126{
127 struct xfrm_if __rcu **xip;
128 struct xfrm_if *iter;
129
Olivier Deprez157378f2022-04-04 15:47:50 +0200130 for (xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)];
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000131 (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
140static void xfrmi_dev_free(struct net_device *dev)
141{
142 struct xfrm_if *xi = netdev_priv(dev);
143
144 gro_cells_destroy(&xi->gro_cells);
145 free_percpu(dev->tstats);
146}
147
David Brazdil0f672f62019-12-10 10:32:29 +0000148static int xfrmi_create(struct net_device *dev)
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000149{
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
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000160 xfrmi_link(xfrmn, xi);
161
162 return 0;
163
164out:
165 return err;
166}
167
David Brazdil0f672f62019-12-10 10:32:29 +0000168static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p)
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000169{
170 struct xfrm_if __rcu **xip;
171 struct xfrm_if *xi;
172 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
173
Olivier Deprez157378f2022-04-04 15:47:50 +0200174 for (xip = &xfrmn->xfrmi[xfrmi_hash(p->if_id)];
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000175 (xi = rtnl_dereference(*xip)) != NULL;
David Brazdil0f672f62019-12-10 10:32:29 +0000176 xip = &xi->next)
177 if (xi->p.if_id == p->if_id)
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000178 return xi;
David Brazdil0f672f62019-12-10 10:32:29 +0000179
180 return NULL;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000181}
182
183static 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);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000189}
190
191static 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);
David Brazdil0f672f62019-12-10 10:32:29 +0000198 nf_reset_ct(skb);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000199 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
210static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
211{
David Brazdil0f672f62019-12-10 10:32:29 +0000212 const struct xfrm_mode *inner_mode;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000213 struct net_device *dev;
214 struct xfrm_state *x;
215 struct xfrm_if *xi;
216 bool xnet;
217
David Brazdil0f672f62019-12-10 10:32:29 +0000218 if (err && !secpath_exists(skb))
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000219 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) {
David Brazdil0f672f62019-12-10 10:32:29 +0000240 inner_mode = &x->inner_mode;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000241
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,
David Brazdil0f672f62019-12-10 10:32:29 +0000252 inner_mode->family))
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000253 return -EPERM;
254 }
255
256 xfrmi_scrub_packet(skb, xnet);
Olivier Deprez157378f2022-04-04 15:47:50 +0200257 dev_sw_netstats_rx_add(dev, skb->len);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000258
259 return 0;
260}
261
262static int
263xfrmi_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
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000274 dst_hold(dst);
275 dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id);
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",
David Brazdil0f672f62019-12-10 10:32:29 +0000294 dev->name);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000295 goto tx_err_dst_release;
296 }
297
298 mtu = dst_mtu(dst);
Olivier Deprez0e641232021-09-23 10:07:05 +0200299 if (skb->len > mtu) {
300 skb_dst_update_pmtu_no_confirm(skb, mtu);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000301
302 if (skb->protocol == htons(ETH_P_IPV6)) {
303 if (mtu < IPV6_MIN_MTU)
304 mtu = IPV6_MIN_MTU;
305
Olivier Deprez0e641232021-09-23 10:07:05 +0200306 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000307 } else {
Olivier Deprez0e641232021-09-23 10:07:05 +0200308 if (!(ip_hdr(skb)->frag_off & htons(IP_DF)))
309 goto xmit;
310 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
311 htonl(mtu));
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000312 }
313
314 dst_release(dst);
315 return -EMSGSIZE;
316 }
317
Olivier Deprez0e641232021-09-23 10:07:05 +0200318xmit:
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000319 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;
337tx_err_link_failure:
338 stats->tx_carrier_errors++;
339 dst_link_failure(skb);
340tx_err_dst_release:
341 dst_release(dst);
342 return err;
343}
344
345static 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;
Olivier Deprez0e641232021-09-23 10:07:05 +0200349 struct dst_entry *dst = skb_dst(skb);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000350 struct flowi fl;
351 int ret;
352
353 memset(&fl, 0, sizeof(fl));
354
355 switch (skb->protocol) {
356 case htons(ETH_P_IPV6):
357 xfrm_decode_session(skb, &fl, AF_INET6);
358 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
Olivier Deprez0e641232021-09-23 10:07:05 +0200359 if (!dst) {
360 fl.u.ip6.flowi6_oif = dev->ifindex;
361 fl.u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
362 dst = ip6_route_output(dev_net(dev), NULL, &fl.u.ip6);
363 if (dst->error) {
364 dst_release(dst);
365 stats->tx_carrier_errors++;
366 goto tx_err;
367 }
368 skb_dst_set(skb, dst);
369 }
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000370 break;
371 case htons(ETH_P_IP):
372 xfrm_decode_session(skb, &fl, AF_INET);
373 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
Olivier Deprez0e641232021-09-23 10:07:05 +0200374 if (!dst) {
375 struct rtable *rt;
376
377 fl.u.ip4.flowi4_oif = dev->ifindex;
378 fl.u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
379 rt = __ip_route_output_key(dev_net(dev), &fl.u.ip4);
380 if (IS_ERR(rt)) {
381 stats->tx_carrier_errors++;
382 goto tx_err;
383 }
384 skb_dst_set(skb, &rt->dst);
385 }
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000386 break;
387 default:
388 goto tx_err;
389 }
390
David Brazdil0f672f62019-12-10 10:32:29 +0000391 fl.flowi_oif = xi->p.link;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000392
393 ret = xfrmi_xmit2(skb, dev, &fl);
394 if (ret < 0)
395 goto tx_err;
396
397 return NETDEV_TX_OK;
398
399tx_err:
400 stats->tx_errors++;
401 stats->tx_dropped++;
402 kfree_skb(skb);
403 return NETDEV_TX_OK;
404}
405
406static int xfrmi4_err(struct sk_buff *skb, u32 info)
407{
408 const struct iphdr *iph = (const struct iphdr *)skb->data;
409 struct net *net = dev_net(skb->dev);
410 int protocol = iph->protocol;
411 struct ip_comp_hdr *ipch;
412 struct ip_esp_hdr *esph;
413 struct ip_auth_hdr *ah ;
414 struct xfrm_state *x;
415 struct xfrm_if *xi;
416 __be32 spi;
417
418 switch (protocol) {
419 case IPPROTO_ESP:
420 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
421 spi = esph->spi;
422 break;
423 case IPPROTO_AH:
424 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
425 spi = ah->spi;
426 break;
427 case IPPROTO_COMP:
428 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
429 spi = htonl(ntohs(ipch->cpi));
430 break;
431 default:
432 return 0;
433 }
434
435 switch (icmp_hdr(skb)->type) {
436 case ICMP_DEST_UNREACH:
437 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
438 return 0;
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)
David Brazdil0f672f62019-12-10 10:32:29 +0000457 ipv4_update_pmtu(skb, net, info, 0, protocol);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000458 else
David Brazdil0f672f62019-12-10 10:32:29 +0000459 ipv4_redirect(skb, net, 0, protocol);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000460 xfrm_state_put(x);
461
462 return 0;
463}
464
465static 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
520static 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
530static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
531{
David Brazdil0f672f62019-12-10 10:32:29 +0000532 struct net *net = xi->net;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000533 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
544static void xfrmi_get_stats64(struct net_device *dev,
545 struct rtnl_link_stats64 *s)
546{
Olivier Deprez157378f2022-04-04 15:47:50 +0200547 dev_fetch_sw_netstats(s, dev->tstats);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000548
549 s->rx_dropped = dev->stats.rx_dropped;
550 s->tx_dropped = dev->stats.tx_dropped;
551}
552
553static int xfrmi_get_iflink(const struct net_device *dev)
554{
555 struct xfrm_if *xi = netdev_priv(dev);
556
David Brazdil0f672f62019-12-10 10:32:29 +0000557 return xi->p.link;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000558}
559
560
561static const struct net_device_ops xfrmi_netdev_ops = {
562 .ndo_init = xfrmi_dev_init,
563 .ndo_uninit = xfrmi_dev_uninit,
564 .ndo_start_xmit = xfrmi_xmit,
565 .ndo_get_stats64 = xfrmi_get_stats64,
566 .ndo_get_iflink = xfrmi_get_iflink,
567};
568
569static void xfrmi_dev_setup(struct net_device *dev)
570{
571 dev->netdev_ops = &xfrmi_netdev_ops;
Olivier Deprez157378f2022-04-04 15:47:50 +0200572 dev->header_ops = &ip_tunnel_header_ops;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000573 dev->type = ARPHRD_NONE;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000574 dev->mtu = ETH_DATA_LEN;
575 dev->min_mtu = ETH_MIN_MTU;
Olivier Deprez0e641232021-09-23 10:07:05 +0200576 dev->max_mtu = IP_MAX_MTU;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000577 dev->flags = IFF_NOARP;
578 dev->needs_free_netdev = true;
579 dev->priv_destructor = xfrmi_dev_free;
580 netif_keep_dst(dev);
David Brazdil0f672f62019-12-10 10:32:29 +0000581
582 eth_broadcast_addr(dev->broadcast);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000583}
584
585static int xfrmi_dev_init(struct net_device *dev)
586{
587 struct xfrm_if *xi = netdev_priv(dev);
David Brazdil0f672f62019-12-10 10:32:29 +0000588 struct net_device *phydev = __dev_get_by_index(xi->net, xi->p.link);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000589 int err;
590
591 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
592 if (!dev->tstats)
593 return -ENOMEM;
594
595 err = gro_cells_init(&xi->gro_cells, dev);
596 if (err) {
597 free_percpu(dev->tstats);
598 return err;
599 }
600
601 dev->features |= NETIF_F_LLTX;
602
David Brazdil0f672f62019-12-10 10:32:29 +0000603 if (phydev) {
604 dev->needed_headroom = phydev->needed_headroom;
605 dev->needed_tailroom = phydev->needed_tailroom;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000606
David Brazdil0f672f62019-12-10 10:32:29 +0000607 if (is_zero_ether_addr(dev->dev_addr))
608 eth_hw_addr_inherit(dev, phydev);
609 if (is_zero_ether_addr(dev->broadcast))
610 memcpy(dev->broadcast, phydev->broadcast,
611 dev->addr_len);
612 } else {
613 eth_hw_addr_random(dev);
614 eth_broadcast_addr(dev->broadcast);
615 }
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000616
617 return 0;
618}
619
620static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
621 struct netlink_ext_ack *extack)
622{
623 return 0;
624}
625
626static void xfrmi_netlink_parms(struct nlattr *data[],
627 struct xfrm_if_parms *parms)
628{
629 memset(parms, 0, sizeof(*parms));
630
631 if (!data)
632 return;
633
634 if (data[IFLA_XFRM_LINK])
635 parms->link = nla_get_u32(data[IFLA_XFRM_LINK]);
636
637 if (data[IFLA_XFRM_IF_ID])
638 parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]);
639}
640
641static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
642 struct nlattr *tb[], struct nlattr *data[],
643 struct netlink_ext_ack *extack)
644{
645 struct net *net = dev_net(dev);
Olivier Deprez157378f2022-04-04 15:47:50 +0200646 struct xfrm_if_parms p = {};
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000647 struct xfrm_if *xi;
David Brazdil0f672f62019-12-10 10:32:29 +0000648 int err;
649
650 xfrmi_netlink_parms(data, &p);
Olivier Deprez157378f2022-04-04 15:47:50 +0200651 if (!p.if_id) {
652 NL_SET_ERR_MSG(extack, "if_id must be non zero");
653 return -EINVAL;
654 }
655
David Brazdil0f672f62019-12-10 10:32:29 +0000656 xi = xfrmi_locate(net, &p);
657 if (xi)
658 return -EEXIST;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000659
660 xi = netdev_priv(dev);
David Brazdil0f672f62019-12-10 10:32:29 +0000661 xi->p = p;
662 xi->net = net;
663 xi->dev = dev;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000664
David Brazdil0f672f62019-12-10 10:32:29 +0000665 err = xfrmi_create(dev);
666 return err;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000667}
668
669static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
670{
671 unregister_netdevice_queue(dev, head);
672}
673
674static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
675 struct nlattr *data[],
676 struct netlink_ext_ack *extack)
677{
678 struct xfrm_if *xi = netdev_priv(dev);
David Brazdil0f672f62019-12-10 10:32:29 +0000679 struct net *net = xi->net;
Olivier Deprez157378f2022-04-04 15:47:50 +0200680 struct xfrm_if_parms p = {};
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000681
David Brazdil0f672f62019-12-10 10:32:29 +0000682 xfrmi_netlink_parms(data, &p);
Olivier Deprez157378f2022-04-04 15:47:50 +0200683 if (!p.if_id) {
684 NL_SET_ERR_MSG(extack, "if_id must be non zero");
685 return -EINVAL;
686 }
687
David Brazdil0f672f62019-12-10 10:32:29 +0000688 xi = xfrmi_locate(net, &p);
689 if (!xi) {
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000690 xi = netdev_priv(dev);
691 } else {
692 if (xi->dev != dev)
693 return -EEXIST;
694 }
695
David Brazdil0f672f62019-12-10 10:32:29 +0000696 return xfrmi_update(xi, &p);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000697}
698
699static size_t xfrmi_get_size(const struct net_device *dev)
700{
701 return
702 /* IFLA_XFRM_LINK */
703 nla_total_size(4) +
704 /* IFLA_XFRM_IF_ID */
705 nla_total_size(4) +
706 0;
707}
708
709static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev)
710{
711 struct xfrm_if *xi = netdev_priv(dev);
712 struct xfrm_if_parms *parm = &xi->p;
713
714 if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) ||
715 nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id))
716 goto nla_put_failure;
717 return 0;
718
719nla_put_failure:
720 return -EMSGSIZE;
721}
722
David Brazdil0f672f62019-12-10 10:32:29 +0000723static struct net *xfrmi_get_link_net(const struct net_device *dev)
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000724{
725 struct xfrm_if *xi = netdev_priv(dev);
726
David Brazdil0f672f62019-12-10 10:32:29 +0000727 return xi->net;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000728}
729
730static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
731 [IFLA_XFRM_LINK] = { .type = NLA_U32 },
732 [IFLA_XFRM_IF_ID] = { .type = NLA_U32 },
733};
734
735static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
736 .kind = "xfrm",
737 .maxtype = IFLA_XFRM_MAX,
738 .policy = xfrmi_policy,
739 .priv_size = sizeof(struct xfrm_if),
740 .setup = xfrmi_dev_setup,
741 .validate = xfrmi_validate,
742 .newlink = xfrmi_newlink,
743 .dellink = xfrmi_dellink,
744 .changelink = xfrmi_changelink,
745 .get_size = xfrmi_get_size,
746 .fill_info = xfrmi_fill_info,
747 .get_link_net = xfrmi_get_link_net,
748};
749
Olivier Deprez0e641232021-09-23 10:07:05 +0200750static void __net_exit xfrmi_exit_batch_net(struct list_head *net_exit_list)
751{
752 struct net *net;
753 LIST_HEAD(list);
754
755 rtnl_lock();
756 list_for_each_entry(net, net_exit_list, exit_list) {
757 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
758 struct xfrm_if __rcu **xip;
759 struct xfrm_if *xi;
Olivier Deprez157378f2022-04-04 15:47:50 +0200760 int i;
Olivier Deprez0e641232021-09-23 10:07:05 +0200761
Olivier Deprez157378f2022-04-04 15:47:50 +0200762 for (i = 0; i < XFRMI_HASH_SIZE; i++) {
763 for (xip = &xfrmn->xfrmi[i];
764 (xi = rtnl_dereference(*xip)) != NULL;
765 xip = &xi->next)
766 unregister_netdevice_queue(xi->dev, &list);
767 }
Olivier Deprez0e641232021-09-23 10:07:05 +0200768 }
769 unregister_netdevice_many(&list);
770 rtnl_unlock();
771}
772
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000773static struct pernet_operations xfrmi_net_ops = {
Olivier Deprez0e641232021-09-23 10:07:05 +0200774 .exit_batch = xfrmi_exit_batch_net,
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000775 .id = &xfrmi_net_id,
776 .size = sizeof(struct xfrmi_net),
777};
778
779static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = {
780 .handler = xfrm6_rcv,
Olivier Deprez157378f2022-04-04 15:47:50 +0200781 .input_handler = xfrm_input,
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000782 .cb_handler = xfrmi_rcv_cb,
783 .err_handler = xfrmi6_err,
784 .priority = 10,
785};
786
787static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = {
788 .handler = xfrm6_rcv,
Olivier Deprez157378f2022-04-04 15:47:50 +0200789 .input_handler = xfrm_input,
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000790 .cb_handler = xfrmi_rcv_cb,
791 .err_handler = xfrmi6_err,
792 .priority = 10,
793};
794
795static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = {
796 .handler = xfrm6_rcv,
Olivier Deprez157378f2022-04-04 15:47:50 +0200797 .input_handler = xfrm_input,
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000798 .cb_handler = xfrmi_rcv_cb,
799 .err_handler = xfrmi6_err,
800 .priority = 10,
801};
802
Olivier Deprez157378f2022-04-04 15:47:50 +0200803#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
804static int xfrmi6_rcv_tunnel(struct sk_buff *skb)
805{
806 const xfrm_address_t *saddr;
807 __be32 spi;
808
809 saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr;
810 spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);
811
812 return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL);
813}
814
815static struct xfrm6_tunnel xfrmi_ipv6_handler __read_mostly = {
816 .handler = xfrmi6_rcv_tunnel,
817 .cb_handler = xfrmi_rcv_cb,
818 .err_handler = xfrmi6_err,
819 .priority = 2,
820};
821
822static struct xfrm6_tunnel xfrmi_ip6ip_handler __read_mostly = {
823 .handler = xfrmi6_rcv_tunnel,
824 .cb_handler = xfrmi_rcv_cb,
825 .err_handler = xfrmi6_err,
826 .priority = 2,
827};
828#endif
829
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000830static 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
838static 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
846static 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
Olivier Deprez157378f2022-04-04 15:47:50 +0200854#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
855static int xfrmi4_rcv_tunnel(struct sk_buff *skb)
856{
857 return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
858}
859
860static struct xfrm_tunnel xfrmi_ipip_handler __read_mostly = {
861 .handler = xfrmi4_rcv_tunnel,
862 .cb_handler = xfrmi_rcv_cb,
863 .err_handler = xfrmi4_err,
864 .priority = 3,
865};
866
867static struct xfrm_tunnel xfrmi_ipip6_handler __read_mostly = {
868 .handler = xfrmi4_rcv_tunnel,
869 .cb_handler = xfrmi_rcv_cb,
870 .err_handler = xfrmi4_err,
871 .priority = 2,
872};
873#endif
874
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000875static int __init xfrmi4_init(void)
876{
877 int err;
878
879 err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP);
880 if (err < 0)
881 goto xfrm_proto_esp_failed;
882 err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH);
883 if (err < 0)
884 goto xfrm_proto_ah_failed;
885 err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
886 if (err < 0)
887 goto xfrm_proto_comp_failed;
Olivier Deprez157378f2022-04-04 15:47:50 +0200888#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
889 err = xfrm4_tunnel_register(&xfrmi_ipip_handler, AF_INET);
890 if (err < 0)
891 goto xfrm_tunnel_ipip_failed;
892 err = xfrm4_tunnel_register(&xfrmi_ipip6_handler, AF_INET6);
893 if (err < 0)
894 goto xfrm_tunnel_ipip6_failed;
895#endif
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000896
897 return 0;
898
Olivier Deprez157378f2022-04-04 15:47:50 +0200899#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
900xfrm_tunnel_ipip6_failed:
901 xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET);
902xfrm_tunnel_ipip_failed:
903 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
904#endif
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000905xfrm_proto_comp_failed:
906 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
907xfrm_proto_ah_failed:
908 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
909xfrm_proto_esp_failed:
910 return err;
911}
912
913static void xfrmi4_fini(void)
914{
Olivier Deprez157378f2022-04-04 15:47:50 +0200915#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
916 xfrm4_tunnel_deregister(&xfrmi_ipip6_handler, AF_INET6);
917 xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET);
918#endif
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000919 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
920 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
921 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
922}
923
924static int __init xfrmi6_init(void)
925{
926 int err;
927
928 err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP);
929 if (err < 0)
930 goto xfrm_proto_esp_failed;
931 err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH);
932 if (err < 0)
933 goto xfrm_proto_ah_failed;
934 err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
935 if (err < 0)
936 goto xfrm_proto_comp_failed;
Olivier Deprez157378f2022-04-04 15:47:50 +0200937#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
938 err = xfrm6_tunnel_register(&xfrmi_ipv6_handler, AF_INET6);
939 if (err < 0)
940 goto xfrm_tunnel_ipv6_failed;
941 err = xfrm6_tunnel_register(&xfrmi_ip6ip_handler, AF_INET);
942 if (err < 0)
943 goto xfrm_tunnel_ip6ip_failed;
944#endif
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000945
946 return 0;
947
Olivier Deprez157378f2022-04-04 15:47:50 +0200948#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
949xfrm_tunnel_ip6ip_failed:
950 xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6);
951xfrm_tunnel_ipv6_failed:
952 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
953#endif
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000954xfrm_proto_comp_failed:
955 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
956xfrm_proto_ah_failed:
957 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
958xfrm_proto_esp_failed:
959 return err;
960}
961
962static void xfrmi6_fini(void)
963{
Olivier Deprez157378f2022-04-04 15:47:50 +0200964#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
965 xfrm6_tunnel_deregister(&xfrmi_ip6ip_handler, AF_INET);
966 xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6);
967#endif
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000968 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
969 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
970 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
971}
972
973static const struct xfrm_if_cb xfrm_if_cb = {
974 .decode_session = xfrmi_decode_session,
975};
976
977static int __init xfrmi_init(void)
978{
979 const char *msg;
980 int err;
981
982 pr_info("IPsec XFRM device driver\n");
983
984 msg = "tunnel device";
985 err = register_pernet_device(&xfrmi_net_ops);
986 if (err < 0)
987 goto pernet_dev_failed;
988
989 msg = "xfrm4 protocols";
990 err = xfrmi4_init();
991 if (err < 0)
992 goto xfrmi4_failed;
993
994 msg = "xfrm6 protocols";
995 err = xfrmi6_init();
996 if (err < 0)
997 goto xfrmi6_failed;
998
999
1000 msg = "netlink interface";
1001 err = rtnl_link_register(&xfrmi_link_ops);
1002 if (err < 0)
1003 goto rtnl_link_failed;
1004
1005 xfrm_if_register_cb(&xfrm_if_cb);
1006
1007 return err;
1008
1009rtnl_link_failed:
1010 xfrmi6_fini();
1011xfrmi6_failed:
1012 xfrmi4_fini();
1013xfrmi4_failed:
1014 unregister_pernet_device(&xfrmi_net_ops);
1015pernet_dev_failed:
1016 pr_err("xfrmi init: failed to register %s\n", msg);
1017 return err;
1018}
1019
1020static void __exit xfrmi_fini(void)
1021{
1022 xfrm_if_unregister_cb();
1023 rtnl_link_unregister(&xfrmi_link_ops);
1024 xfrmi4_fini();
1025 xfrmi6_fini();
1026 unregister_pernet_device(&xfrmi_net_ops);
1027}
1028
1029module_init(xfrmi_init);
1030module_exit(xfrmi_fini);
1031MODULE_LICENSE("GPL");
1032MODULE_ALIAS_RTNL_LINK("xfrm");
1033MODULE_ALIAS_NETDEV("xfrm0");
1034MODULE_AUTHOR("Steffen Klassert");
1035MODULE_DESCRIPTION("XFRM virtual interface");