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Merge tag 'block-6.0-2022-09-16' of git://git.kernel.dk/linux-block
[linux-block.git] / net / xfrm / xfrm_interface.c
CommitLineData
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
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;
2749c697 51static 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
56struct 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		 64static u32 xfrmi_hash(u32 if_id)
65{
66 return hash_32(if_id, XFRMI_HASH_BITS);
67}
68
f203b76d
SK		 69static 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		 83static 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
117static 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
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
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
140static 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 148static 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
164out:
165 return err;
166}
167
56c5ee1a 168static 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
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);
f203b76d
SK		 189}
190
191static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
192{
de799101 193 skb_clear_tstamp(skb);
f203b76d
SK		 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
210static 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
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
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
4ff2980b
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 322xmit:
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;
336tx_err_link_failure:
337 stats->tx_carrier_errors++;
338 dst_link_failure(skb);
339tx_err_dst_release:
340 dst_release(dst);
341 return err;
342}
343
344static 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
398tx_err:
399 stats->tx_errors++;
400 stats->tx_dropped++;
401 kfree_skb(skb);
402 return NETDEV_TX_OK;
403}
404
405static 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
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{
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		 544static 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		 551static 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
559static 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		 580static 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
617static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
618 struct netlink_ext_ack *extack)
619{
620 return 0;
621}
622
623static 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
638static 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);
8dce4391 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);
8dce4391
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
666static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
667{
668 unregister_netdevice_queue(dev, head);
669}
670
671static 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;
8dce4391
AA		 677 struct xfrm_if_parms p = {};
678
6d0d95a1 679 xfrmi_netlink_parms(data, &p);
8dce4391
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
696static 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
706static 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
716nla_put_failure:
717 return -EMSGSIZE;
718}
719
211d6f2d 720static 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
727static 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
732static 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		 747static 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 770static 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
776static 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
784static 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
792static 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		 801static 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
812static 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
819static 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		 827static 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
835static 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
843static 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		 852static int xfrmi4_rcv_tunnel(struct sk_buff *skb)
853{
854 return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
855}
856
857static 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
864static 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		 872static 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		 897xfrm_tunnel_ipip6_failed:
898 xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET);
899xfrm_tunnel_ipip_failed:
900 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
901#endif
f203b76d
SK		 902xfrm_proto_comp_failed:
903 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
904xfrm_proto_ah_failed:
905 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
906xfrm_proto_esp_failed:
907 return err;
908}
909
910static 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
921static 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		 946xfrm_tunnel_ip6ip_failed:
947 xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6);
948xfrm_tunnel_ipv6_failed:
949 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
950#endif
f203b76d
SK		 951xfrm_proto_comp_failed:
952 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
953xfrm_proto_ah_failed:
954 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
955xfrm_proto_esp_failed:
956 return err;
957}
958
959static 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
970static const struct xfrm_if_cb xfrm_if_cb = {
971 .decode_session = xfrmi_decode_session,
972};
973
974static 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
1006rtnl_link_failed:
1007 xfrmi6_fini();
1008xfrmi6_failed:
1009 xfrmi4_fini();
1010xfrmi4_failed:
1011 unregister_pernet_device(&xfrmi_net_ops);
1012pernet_dev_failed:
1013 pr_err("xfrmi init: failed to register %s\n", msg);
1014 return err;
1015}
1016
1017static 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
1026module_init(xfrmi_init);
1027module_exit(xfrmi_fini);
1028MODULE_LICENSE("GPL");
1029MODULE_ALIAS_RTNL_LINK("xfrm");
1030MODULE_ALIAS_NETDEV("xfrm0");
1031MODULE_AUTHOR("Steffen Klassert");
1032MODULE_DESCRIPTION("XFRM virtual interface");
Linux 6.x block layer and io_uring tree(s)