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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * xfrm_device.c - IPsec device offloading code.
4 *
5 * Copyright (c) 2015 secunet Security Networks AG
6 *
7 * Author:
8 * Steffen Klassert <steffen.klassert@secunet.com>
9 */
10
11#include <linux/errno.h>
12#include <linux/module.h>
13#include <linux/netdevice.h>
14#include <linux/skbuff.h>
15#include <linux/slab.h>
16#include <linux/spinlock.h>
17#include <net/dst.h>
18#include <net/xfrm.h>
19#include <linux/notifier.h>
20
21#ifdef CONFIG_XFRM_OFFLOAD
22static void __xfrm_transport_prep(struct xfrm_state *x, struct sk_buff *skb,
23 unsigned int hsize)
24{
25 struct xfrm_offload *xo = xfrm_offload(skb);
26
27 skb_reset_mac_len(skb);
28 if (xo->flags & XFRM_GSO_SEGMENT)
29 skb->transport_header -= x->props.header_len;
30
31 pskb_pull(skb, skb_transport_offset(skb) + x->props.header_len);
32}
33
34static void __xfrm_mode_tunnel_prep(struct xfrm_state *x, struct sk_buff *skb,
35 unsigned int hsize)
36
37{
38 struct xfrm_offload *xo = xfrm_offload(skb);
39
40 if (xo->flags & XFRM_GSO_SEGMENT)
41 skb->transport_header = skb->network_header + hsize;
42
43 skb_reset_mac_len(skb);
44 pskb_pull(skb, skb->mac_len + x->props.header_len);
45}
46
47static void __xfrm_mode_beet_prep(struct xfrm_state *x, struct sk_buff *skb,
48 unsigned int hsize)
49{
50 struct xfrm_offload *xo = xfrm_offload(skb);
51 int phlen = 0;
52
53 if (xo->flags & XFRM_GSO_SEGMENT)
54 skb->transport_header = skb->network_header + hsize;
55
56 skb_reset_mac_len(skb);
57 if (x->sel.family != AF_INET6) {
58 phlen = IPV4_BEET_PHMAXLEN;
59 if (x->outer_mode.family == AF_INET6)
60 phlen += sizeof(struct ipv6hdr) - sizeof(struct iphdr);
61 }
62
63 pskb_pull(skb, skb->mac_len + hsize + (x->props.header_len - phlen));
64}
65
66/* Adjust pointers into the packet when IPsec is done at layer2 */
67static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb)
68{
69 switch (x->outer_mode.encap) {
70 case XFRM_MODE_TUNNEL:
71 if (x->outer_mode.family == AF_INET)
72 return __xfrm_mode_tunnel_prep(x, skb,
73 sizeof(struct iphdr));
74 if (x->outer_mode.family == AF_INET6)
75 return __xfrm_mode_tunnel_prep(x, skb,
76 sizeof(struct ipv6hdr));
77 break;
78 case XFRM_MODE_TRANSPORT:
79 if (x->outer_mode.family == AF_INET)
80 return __xfrm_transport_prep(x, skb,
81 sizeof(struct iphdr));
82 if (x->outer_mode.family == AF_INET6)
83 return __xfrm_transport_prep(x, skb,
84 sizeof(struct ipv6hdr));
85 break;
86 case XFRM_MODE_BEET:
87 if (x->outer_mode.family == AF_INET)
88 return __xfrm_mode_beet_prep(x, skb,
89 sizeof(struct iphdr));
90 if (x->outer_mode.family == AF_INET6)
91 return __xfrm_mode_beet_prep(x, skb,
92 sizeof(struct ipv6hdr));
93 break;
94 case XFRM_MODE_ROUTEOPTIMIZATION:
95 case XFRM_MODE_IN_TRIGGER:
96 break;
97 }
98}
99
100static inline bool xmit_xfrm_check_overflow(struct sk_buff *skb)
101{
102 struct xfrm_offload *xo = xfrm_offload(skb);
103 __u32 seq = xo->seq.low;
104
105 seq += skb_shinfo(skb)->gso_segs;
106 if (unlikely(seq < xo->seq.low))
107 return true;
108
109 return false;
110}
111
112struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
113{
114 int err;
115 unsigned long flags;
116 struct xfrm_state *x;
117 struct softnet_data *sd;
118 struct sk_buff *skb2, *nskb, *pskb = NULL;
119 netdev_features_t esp_features = features;
120 struct xfrm_offload *xo = xfrm_offload(skb);
121 struct net_device *dev = skb->dev;
122 struct sec_path *sp;
123
124 if (!xo || (xo->flags & XFRM_XMIT))
125 return skb;
126
127 if (!(features & NETIF_F_HW_ESP))
128 esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
129
130 sp = skb_sec_path(skb);
131 x = sp->xvec[sp->len - 1];
132 if (xo->flags & XFRM_GRO || x->xso.dir == XFRM_DEV_OFFLOAD_IN)
133 return skb;
134
135 /* The packet was sent to HW IPsec packet offload engine,
136 * but to wrong device. Drop the packet, so it won't skip
137 * XFRM stack.
138 */
139 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET && x->xso.dev != dev) {
140 kfree_skb(skb);
141 dev_core_stats_tx_dropped_inc(dev);
142 return NULL;
143 }
144
145 /* This skb was already validated on the upper/virtual dev */
146 if ((x->xso.dev != dev) && (x->xso.real_dev == dev))
147 return skb;
148
149 local_irq_save(flags);
150 sd = this_cpu_ptr(&softnet_data);
151 err = !skb_queue_empty(&sd->xfrm_backlog);
152 local_irq_restore(flags);
153
154 if (err) {
155 *again = true;
156 return skb;
157 }
158
159 if (skb_is_gso(skb) && (unlikely(x->xso.dev != dev) ||
160 unlikely(xmit_xfrm_check_overflow(skb)))) {
161 struct sk_buff *segs;
162
163 /* Packet got rerouted, fixup features and segment it. */
164 esp_features = esp_features & ~(NETIF_F_HW_ESP | NETIF_F_GSO_ESP);
165
166 segs = skb_gso_segment(skb, esp_features);
167 if (IS_ERR(segs)) {
168 kfree_skb(skb);
169 dev_core_stats_tx_dropped_inc(dev);
170 return NULL;
171 } else {
172 consume_skb(skb);
173 skb = segs;
174 }
175 }
176
177 if (!skb->next) {
178 esp_features |= skb->dev->gso_partial_features;
179 xfrm_outer_mode_prep(x, skb);
180
181 xo->flags |= XFRM_DEV_RESUME;
182
183 err = x->type_offload->xmit(x, skb, esp_features);
184 if (err) {
185 if (err == -EINPROGRESS)
186 return NULL;
187
188 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
189 kfree_skb(skb);
190 return NULL;
191 }
192
193 skb_push(skb, skb->data - skb_mac_header(skb));
194
195 return skb;
196 }
197
198 skb_list_walk_safe(skb, skb2, nskb) {
199 esp_features |= skb->dev->gso_partial_features;
200 skb_mark_not_on_list(skb2);
201
202 xo = xfrm_offload(skb2);
203 xo->flags |= XFRM_DEV_RESUME;
204
205 xfrm_outer_mode_prep(x, skb2);
206
207 err = x->type_offload->xmit(x, skb2, esp_features);
208 if (!err) {
209 skb2->next = nskb;
210 } else if (err != -EINPROGRESS) {
211 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
212 skb2->next = nskb;
213 kfree_skb_list(skb2);
214 return NULL;
215 } else {
216 if (skb == skb2)
217 skb = nskb;
218 else
219 pskb->next = nskb;
220
221 continue;
222 }
223
224 skb_push(skb2, skb2->data - skb_mac_header(skb2));
225 pskb = skb2;
226 }
227
228 return skb;
229}
230EXPORT_SYMBOL_GPL(validate_xmit_xfrm);
231
232int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
233 struct xfrm_user_offload *xuo,
234 struct netlink_ext_ack *extack)
235{
236 int err;
237 struct dst_entry *dst;
238 struct net_device *dev;
239 struct xfrm_dev_offload *xso = &x->xso;
240 xfrm_address_t *saddr;
241 xfrm_address_t *daddr;
242 bool is_packet_offload;
243
244 if (!x->type_offload) {
245 NL_SET_ERR_MSG(extack, "Type doesn't support offload");
246 return -EINVAL;
247 }
248
249 /* We don't yet support UDP encapsulation and TFC padding. */
250 if (x->encap || x->tfcpad) {
251 NL_SET_ERR_MSG(extack, "Encapsulation and TFC padding can't be offloaded");
252 return -EINVAL;
253 }
254
255 if (xuo->flags &
256 ~(XFRM_OFFLOAD_IPV6 | XFRM_OFFLOAD_INBOUND | XFRM_OFFLOAD_PACKET)) {
257 NL_SET_ERR_MSG(extack, "Unrecognized flags in offload request");
258 return -EINVAL;
259 }
260
261 is_packet_offload = xuo->flags & XFRM_OFFLOAD_PACKET;
262 dev = dev_get_by_index(net, xuo->ifindex);
263 if (!dev) {
264 if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) {
265 saddr = &x->props.saddr;
266 daddr = &x->id.daddr;
267 } else {
268 saddr = &x->id.daddr;
269 daddr = &x->props.saddr;
270 }
271
272 dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr,
273 x->props.family,
274 xfrm_smark_get(0, x));
275 if (IS_ERR(dst))
276 return (is_packet_offload) ? -EINVAL : 0;
277
278 dev = dst->dev;
279
280 dev_hold(dev);
281 dst_release(dst);
282 }
283
284 if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_state_add) {
285 xso->dev = NULL;
286 dev_put(dev);
287 return (is_packet_offload) ? -EINVAL : 0;
288 }
289
290 if (x->props.flags & XFRM_STATE_ESN &&
291 !dev->xfrmdev_ops->xdo_dev_state_advance_esn) {
292 NL_SET_ERR_MSG(extack, "Device doesn't support offload with ESN");
293 xso->dev = NULL;
294 dev_put(dev);
295 return -EINVAL;
296 }
297
298 xso->dev = dev;
299 netdev_tracker_alloc(dev, &xso->dev_tracker, GFP_ATOMIC);
300 xso->real_dev = dev;
301
302 if (xuo->flags & XFRM_OFFLOAD_INBOUND)
303 xso->dir = XFRM_DEV_OFFLOAD_IN;
304 else
305 xso->dir = XFRM_DEV_OFFLOAD_OUT;
306
307 if (is_packet_offload)
308 xso->type = XFRM_DEV_OFFLOAD_PACKET;
309 else
310 xso->type = XFRM_DEV_OFFLOAD_CRYPTO;
311
312 err = dev->xfrmdev_ops->xdo_dev_state_add(x);
313 if (err) {
314 xso->dev = NULL;
315 xso->dir = 0;
316 xso->real_dev = NULL;
317 netdev_put(dev, &xso->dev_tracker);
318 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
319
320 /* User explicitly requested packet offload mode and configured
321 * policy in addition to the XFRM state. So be civil to users,
322 * and return an error instead of taking fallback path.
323 *
324 * This WARN_ON() can be seen as a documentation for driver
325 * authors to do not return -EOPNOTSUPP in packet offload mode.
326 */
327 WARN_ON(err == -EOPNOTSUPP && is_packet_offload);
328 if (err != -EOPNOTSUPP || is_packet_offload) {
329 NL_SET_ERR_MSG(extack, "Device failed to offload this state");
330 return err;
331 }
332 }
333
334 return 0;
335}
336EXPORT_SYMBOL_GPL(xfrm_dev_state_add);
337
338int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
339 struct xfrm_user_offload *xuo, u8 dir,
340 struct netlink_ext_ack *extack)
341{
342 struct xfrm_dev_offload *xdo = &xp->xdo;
343 struct net_device *dev;
344 int err;
345
346 if (!xuo->flags || xuo->flags & ~XFRM_OFFLOAD_PACKET) {
347 /* We support only packet offload mode and it means
348 * that user must set XFRM_OFFLOAD_PACKET bit.
349 */
350 NL_SET_ERR_MSG(extack, "Unrecognized flags in offload request");
351 return -EINVAL;
352 }
353
354 dev = dev_get_by_index(net, xuo->ifindex);
355 if (!dev)
356 return -EINVAL;
357
358 if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_policy_add) {
359 xdo->dev = NULL;
360 dev_put(dev);
361 NL_SET_ERR_MSG(extack, "Policy offload is not supported");
362 return -EINVAL;
363 }
364
365 xdo->dev = dev;
366 netdev_tracker_alloc(dev, &xdo->dev_tracker, GFP_ATOMIC);
367 xdo->real_dev = dev;
368 xdo->type = XFRM_DEV_OFFLOAD_PACKET;
369 switch (dir) {
370 case XFRM_POLICY_IN:
371 xdo->dir = XFRM_DEV_OFFLOAD_IN;
372 break;
373 case XFRM_POLICY_OUT:
374 xdo->dir = XFRM_DEV_OFFLOAD_OUT;
375 break;
376 case XFRM_POLICY_FWD:
377 xdo->dir = XFRM_DEV_OFFLOAD_FWD;
378 break;
379 default:
380 xdo->dev = NULL;
381 dev_put(dev);
382 NL_SET_ERR_MSG(extack, "Unrecognized offload direction");
383 return -EINVAL;
384 }
385
386 err = dev->xfrmdev_ops->xdo_dev_policy_add(xp);
387 if (err) {
388 xdo->dev = NULL;
389 xdo->real_dev = NULL;
390 xdo->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
391 xdo->dir = 0;
392 netdev_put(dev, &xdo->dev_tracker);
393 NL_SET_ERR_MSG(extack, "Device failed to offload this policy");
394 return err;
395 }
396
397 return 0;
398}
399EXPORT_SYMBOL_GPL(xfrm_dev_policy_add);
400
401bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
402{
403 int mtu;
404 struct dst_entry *dst = skb_dst(skb);
405 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
406 struct net_device *dev = x->xso.dev;
407
408 if (!x->type_offload || x->encap)
409 return false;
410
411 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET ||
412 ((!dev || (dev == xfrm_dst_path(dst)->dev)) &&
413 !xdst->child->xfrm)) {
414 mtu = xfrm_state_mtu(x, xdst->child_mtu_cached);
415 if (skb->len <= mtu)
416 goto ok;
417
418 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
419 goto ok;
420 }
421
422 return false;
423
424ok:
425 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok)
426 return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x);
427
428 return true;
429}
430EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok);
431
432void xfrm_dev_resume(struct sk_buff *skb)
433{
434 struct net_device *dev = skb->dev;
435 int ret = NETDEV_TX_BUSY;
436 struct netdev_queue *txq;
437 struct softnet_data *sd;
438 unsigned long flags;
439
440 rcu_read_lock();
441 txq = netdev_core_pick_tx(dev, skb, NULL);
442
443 HARD_TX_LOCK(dev, txq, smp_processor_id());
444 if (!netif_xmit_frozen_or_stopped(txq))
445 skb = dev_hard_start_xmit(skb, dev, txq, &ret);
446 HARD_TX_UNLOCK(dev, txq);
447
448 if (!dev_xmit_complete(ret)) {
449 local_irq_save(flags);
450 sd = this_cpu_ptr(&softnet_data);
451 skb_queue_tail(&sd->xfrm_backlog, skb);
452 raise_softirq_irqoff(NET_TX_SOFTIRQ);
453 local_irq_restore(flags);
454 }
455 rcu_read_unlock();
456}
457EXPORT_SYMBOL_GPL(xfrm_dev_resume);
458
459void xfrm_dev_backlog(struct softnet_data *sd)
460{
461 struct sk_buff_head *xfrm_backlog = &sd->xfrm_backlog;
462 struct sk_buff_head list;
463 struct sk_buff *skb;
464
465 if (skb_queue_empty(xfrm_backlog))
466 return;
467
468 __skb_queue_head_init(&list);
469
470 spin_lock(&xfrm_backlog->lock);
471 skb_queue_splice_init(xfrm_backlog, &list);
472 spin_unlock(&xfrm_backlog->lock);
473
474 while (!skb_queue_empty(&list)) {
475 skb = __skb_dequeue(&list);
476 xfrm_dev_resume(skb);
477 }
478
479}
480#endif
481
482static int xfrm_api_check(struct net_device *dev)
483{
484#ifdef CONFIG_XFRM_OFFLOAD
485 if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) &&
486 !(dev->features & NETIF_F_HW_ESP))
487 return NOTIFY_BAD;
488
489 if ((dev->features & NETIF_F_HW_ESP) &&
490 (!(dev->xfrmdev_ops &&
491 dev->xfrmdev_ops->xdo_dev_state_add &&
492 dev->xfrmdev_ops->xdo_dev_state_delete)))
493 return NOTIFY_BAD;
494#else
495 if (dev->features & (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM))
496 return NOTIFY_BAD;
497#endif
498
499 return NOTIFY_DONE;
500}
501
502static int xfrm_dev_down(struct net_device *dev)
503{
504 if (dev->features & NETIF_F_HW_ESP) {
505 xfrm_dev_state_flush(dev_net(dev), dev, true);
506 xfrm_dev_policy_flush(dev_net(dev), dev, true);
507 }
508
509 return NOTIFY_DONE;
510}
511
512static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
513{
514 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
515
516 switch (event) {
517 case NETDEV_REGISTER:
518 return xfrm_api_check(dev);
519
520 case NETDEV_FEAT_CHANGE:
521 return xfrm_api_check(dev);
522
523 case NETDEV_DOWN:
524 case NETDEV_UNREGISTER:
525 return xfrm_dev_down(dev);
526 }
527 return NOTIFY_DONE;
528}
529
530static struct notifier_block xfrm_dev_notifier = {
531 .notifier_call = xfrm_dev_event,
532};
533
534void __init xfrm_dev_init(void)
535{
536 register_netdevice_notifier(&xfrm_dev_notifier);
537}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * xfrm_device.c - IPsec device offloading code.
4 *
5 * Copyright (c) 2015 secunet Security Networks AG
6 *
7 * Author:
8 * Steffen Klassert <steffen.klassert@secunet.com>
9 */
10
11#include <linux/errno.h>
12#include <linux/module.h>
13#include <linux/netdevice.h>
14#include <linux/skbuff.h>
15#include <linux/slab.h>
16#include <linux/spinlock.h>
17#include <net/dst.h>
18#include <net/gso.h>
19#include <net/xfrm.h>
20#include <linux/notifier.h>
21
22#ifdef CONFIG_XFRM_OFFLOAD
23static void __xfrm_transport_prep(struct xfrm_state *x, struct sk_buff *skb,
24 unsigned int hsize)
25{
26 struct xfrm_offload *xo = xfrm_offload(skb);
27
28 skb_reset_mac_len(skb);
29 if (xo->flags & XFRM_GSO_SEGMENT)
30 skb->transport_header -= x->props.header_len;
31
32 pskb_pull(skb, skb_transport_offset(skb) + x->props.header_len);
33}
34
35static void __xfrm_mode_tunnel_prep(struct xfrm_state *x, struct sk_buff *skb,
36 unsigned int hsize)
37
38{
39 struct xfrm_offload *xo = xfrm_offload(skb);
40
41 if (xo->flags & XFRM_GSO_SEGMENT)
42 skb->transport_header = skb->network_header + hsize;
43
44 skb_reset_mac_len(skb);
45 pskb_pull(skb, skb->mac_len + x->props.header_len);
46}
47
48static void __xfrm_mode_beet_prep(struct xfrm_state *x, struct sk_buff *skb,
49 unsigned int hsize)
50{
51 struct xfrm_offload *xo = xfrm_offload(skb);
52 int phlen = 0;
53
54 if (xo->flags & XFRM_GSO_SEGMENT)
55 skb->transport_header = skb->network_header + hsize;
56
57 skb_reset_mac_len(skb);
58 if (x->sel.family != AF_INET6) {
59 phlen = IPV4_BEET_PHMAXLEN;
60 if (x->outer_mode.family == AF_INET6)
61 phlen += sizeof(struct ipv6hdr) - sizeof(struct iphdr);
62 }
63
64 pskb_pull(skb, skb->mac_len + hsize + (x->props.header_len - phlen));
65}
66
67/* Adjust pointers into the packet when IPsec is done at layer2 */
68static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb)
69{
70 switch (x->outer_mode.encap) {
71 case XFRM_MODE_TUNNEL:
72 if (x->outer_mode.family == AF_INET)
73 return __xfrm_mode_tunnel_prep(x, skb,
74 sizeof(struct iphdr));
75 if (x->outer_mode.family == AF_INET6)
76 return __xfrm_mode_tunnel_prep(x, skb,
77 sizeof(struct ipv6hdr));
78 break;
79 case XFRM_MODE_TRANSPORT:
80 if (x->outer_mode.family == AF_INET)
81 return __xfrm_transport_prep(x, skb,
82 sizeof(struct iphdr));
83 if (x->outer_mode.family == AF_INET6)
84 return __xfrm_transport_prep(x, skb,
85 sizeof(struct ipv6hdr));
86 break;
87 case XFRM_MODE_BEET:
88 if (x->outer_mode.family == AF_INET)
89 return __xfrm_mode_beet_prep(x, skb,
90 sizeof(struct iphdr));
91 if (x->outer_mode.family == AF_INET6)
92 return __xfrm_mode_beet_prep(x, skb,
93 sizeof(struct ipv6hdr));
94 break;
95 case XFRM_MODE_ROUTEOPTIMIZATION:
96 case XFRM_MODE_IN_TRIGGER:
97 break;
98 }
99}
100
101static inline bool xmit_xfrm_check_overflow(struct sk_buff *skb)
102{
103 struct xfrm_offload *xo = xfrm_offload(skb);
104 __u32 seq = xo->seq.low;
105
106 seq += skb_shinfo(skb)->gso_segs;
107 if (unlikely(seq < xo->seq.low))
108 return true;
109
110 return false;
111}
112
113struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
114{
115 int err;
116 unsigned long flags;
117 struct xfrm_state *x;
118 struct softnet_data *sd;
119 struct sk_buff *skb2, *nskb, *pskb = NULL;
120 netdev_features_t esp_features = features;
121 struct xfrm_offload *xo = xfrm_offload(skb);
122 struct net_device *dev = skb->dev;
123 struct sec_path *sp;
124
125 if (!xo || (xo->flags & XFRM_XMIT))
126 return skb;
127
128 if (!(features & NETIF_F_HW_ESP))
129 esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
130
131 sp = skb_sec_path(skb);
132 x = sp->xvec[sp->len - 1];
133 if (xo->flags & XFRM_GRO || x->xso.dir == XFRM_DEV_OFFLOAD_IN)
134 return skb;
135
136 /* The packet was sent to HW IPsec packet offload engine,
137 * but to wrong device. Drop the packet, so it won't skip
138 * XFRM stack.
139 */
140 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET && x->xso.dev != dev) {
141 kfree_skb(skb);
142 dev_core_stats_tx_dropped_inc(dev);
143 return NULL;
144 }
145
146 /* This skb was already validated on the upper/virtual dev */
147 if ((x->xso.dev != dev) && (x->xso.real_dev == dev))
148 return skb;
149
150 local_irq_save(flags);
151 sd = this_cpu_ptr(&softnet_data);
152 err = !skb_queue_empty(&sd->xfrm_backlog);
153 local_irq_restore(flags);
154
155 if (err) {
156 *again = true;
157 return skb;
158 }
159
160 if (skb_is_gso(skb) && (unlikely(x->xso.dev != dev) ||
161 unlikely(xmit_xfrm_check_overflow(skb)))) {
162 struct sk_buff *segs;
163
164 /* Packet got rerouted, fixup features and segment it. */
165 esp_features = esp_features & ~(NETIF_F_HW_ESP | NETIF_F_GSO_ESP);
166
167 segs = skb_gso_segment(skb, esp_features);
168 if (IS_ERR(segs)) {
169 kfree_skb(skb);
170 dev_core_stats_tx_dropped_inc(dev);
171 return NULL;
172 } else {
173 consume_skb(skb);
174 skb = segs;
175 }
176 }
177
178 if (!skb->next) {
179 esp_features |= skb->dev->gso_partial_features;
180 xfrm_outer_mode_prep(x, skb);
181
182 xo->flags |= XFRM_DEV_RESUME;
183
184 err = x->type_offload->xmit(x, skb, esp_features);
185 if (err) {
186 if (err == -EINPROGRESS)
187 return NULL;
188
189 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
190 kfree_skb(skb);
191 return NULL;
192 }
193
194 skb_push(skb, skb->data - skb_mac_header(skb));
195
196 return skb;
197 }
198
199 skb_list_walk_safe(skb, skb2, nskb) {
200 esp_features |= skb->dev->gso_partial_features;
201 skb_mark_not_on_list(skb2);
202
203 xo = xfrm_offload(skb2);
204 xo->flags |= XFRM_DEV_RESUME;
205
206 xfrm_outer_mode_prep(x, skb2);
207
208 err = x->type_offload->xmit(x, skb2, esp_features);
209 if (!err) {
210 skb2->next = nskb;
211 } else if (err != -EINPROGRESS) {
212 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
213 skb2->next = nskb;
214 kfree_skb_list(skb2);
215 return NULL;
216 } else {
217 if (skb == skb2)
218 skb = nskb;
219 else
220 pskb->next = nskb;
221
222 continue;
223 }
224
225 skb_push(skb2, skb2->data - skb_mac_header(skb2));
226 pskb = skb2;
227 }
228
229 return skb;
230}
231EXPORT_SYMBOL_GPL(validate_xmit_xfrm);
232
233int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
234 struct xfrm_user_offload *xuo,
235 struct netlink_ext_ack *extack)
236{
237 int err;
238 struct dst_entry *dst;
239 struct net_device *dev;
240 struct xfrm_dev_offload *xso = &x->xso;
241 xfrm_address_t *saddr;
242 xfrm_address_t *daddr;
243 bool is_packet_offload;
244
245 if (!x->type_offload) {
246 NL_SET_ERR_MSG(extack, "Type doesn't support offload");
247 return -EINVAL;
248 }
249
250 if (xuo->flags &
251 ~(XFRM_OFFLOAD_IPV6 | XFRM_OFFLOAD_INBOUND | XFRM_OFFLOAD_PACKET)) {
252 NL_SET_ERR_MSG(extack, "Unrecognized flags in offload request");
253 return -EINVAL;
254 }
255
256 is_packet_offload = xuo->flags & XFRM_OFFLOAD_PACKET;
257
258 /* We don't yet support UDP encapsulation and TFC padding. */
259 if ((!is_packet_offload && x->encap) || x->tfcpad) {
260 NL_SET_ERR_MSG(extack, "Encapsulation and TFC padding can't be offloaded");
261 return -EINVAL;
262 }
263
264 dev = dev_get_by_index(net, xuo->ifindex);
265 if (!dev) {
266 if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) {
267 saddr = &x->props.saddr;
268 daddr = &x->id.daddr;
269 } else {
270 saddr = &x->id.daddr;
271 daddr = &x->props.saddr;
272 }
273
274 dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr,
275 x->props.family,
276 xfrm_smark_get(0, x));
277 if (IS_ERR(dst))
278 return (is_packet_offload) ? -EINVAL : 0;
279
280 dev = dst->dev;
281
282 dev_hold(dev);
283 dst_release(dst);
284 }
285
286 if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_state_add) {
287 xso->dev = NULL;
288 dev_put(dev);
289 return (is_packet_offload) ? -EINVAL : 0;
290 }
291
292 if (!is_packet_offload && x->props.flags & XFRM_STATE_ESN &&
293 !dev->xfrmdev_ops->xdo_dev_state_advance_esn) {
294 NL_SET_ERR_MSG(extack, "Device doesn't support offload with ESN");
295 xso->dev = NULL;
296 dev_put(dev);
297 return -EINVAL;
298 }
299
300 xso->dev = dev;
301 netdev_tracker_alloc(dev, &xso->dev_tracker, GFP_ATOMIC);
302 xso->real_dev = dev;
303
304 if (xuo->flags & XFRM_OFFLOAD_INBOUND)
305 xso->dir = XFRM_DEV_OFFLOAD_IN;
306 else
307 xso->dir = XFRM_DEV_OFFLOAD_OUT;
308
309 if (is_packet_offload)
310 xso->type = XFRM_DEV_OFFLOAD_PACKET;
311 else
312 xso->type = XFRM_DEV_OFFLOAD_CRYPTO;
313
314 err = dev->xfrmdev_ops->xdo_dev_state_add(x, extack);
315 if (err) {
316 xso->dev = NULL;
317 xso->dir = 0;
318 xso->real_dev = NULL;
319 netdev_put(dev, &xso->dev_tracker);
320 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
321
322 /* User explicitly requested packet offload mode and configured
323 * policy in addition to the XFRM state. So be civil to users,
324 * and return an error instead of taking fallback path.
325 *
326 * This WARN_ON() can be seen as a documentation for driver
327 * authors to do not return -EOPNOTSUPP in packet offload mode.
328 */
329 WARN_ON(err == -EOPNOTSUPP && is_packet_offload);
330 if (err != -EOPNOTSUPP || is_packet_offload) {
331 NL_SET_ERR_MSG_WEAK(extack, "Device failed to offload this state");
332 return err;
333 }
334 }
335
336 return 0;
337}
338EXPORT_SYMBOL_GPL(xfrm_dev_state_add);
339
340int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
341 struct xfrm_user_offload *xuo, u8 dir,
342 struct netlink_ext_ack *extack)
343{
344 struct xfrm_dev_offload *xdo = &xp->xdo;
345 struct net_device *dev;
346 int err;
347
348 if (!xuo->flags || xuo->flags & ~XFRM_OFFLOAD_PACKET) {
349 /* We support only packet offload mode and it means
350 * that user must set XFRM_OFFLOAD_PACKET bit.
351 */
352 NL_SET_ERR_MSG(extack, "Unrecognized flags in offload request");
353 return -EINVAL;
354 }
355
356 dev = dev_get_by_index(net, xuo->ifindex);
357 if (!dev)
358 return -EINVAL;
359
360 if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_policy_add) {
361 xdo->dev = NULL;
362 dev_put(dev);
363 NL_SET_ERR_MSG(extack, "Policy offload is not supported");
364 return -EINVAL;
365 }
366
367 xdo->dev = dev;
368 netdev_tracker_alloc(dev, &xdo->dev_tracker, GFP_ATOMIC);
369 xdo->real_dev = dev;
370 xdo->type = XFRM_DEV_OFFLOAD_PACKET;
371 switch (dir) {
372 case XFRM_POLICY_IN:
373 xdo->dir = XFRM_DEV_OFFLOAD_IN;
374 break;
375 case XFRM_POLICY_OUT:
376 xdo->dir = XFRM_DEV_OFFLOAD_OUT;
377 break;
378 case XFRM_POLICY_FWD:
379 xdo->dir = XFRM_DEV_OFFLOAD_FWD;
380 break;
381 default:
382 xdo->dev = NULL;
383 netdev_put(dev, &xdo->dev_tracker);
384 NL_SET_ERR_MSG(extack, "Unrecognized offload direction");
385 return -EINVAL;
386 }
387
388 err = dev->xfrmdev_ops->xdo_dev_policy_add(xp, extack);
389 if (err) {
390 xdo->dev = NULL;
391 xdo->real_dev = NULL;
392 xdo->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
393 xdo->dir = 0;
394 netdev_put(dev, &xdo->dev_tracker);
395 NL_SET_ERR_MSG_WEAK(extack, "Device failed to offload this policy");
396 return err;
397 }
398
399 return 0;
400}
401EXPORT_SYMBOL_GPL(xfrm_dev_policy_add);
402
403bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
404{
405 int mtu;
406 struct dst_entry *dst = skb_dst(skb);
407 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
408 struct net_device *dev = x->xso.dev;
409
410 if (!x->type_offload ||
411 (x->xso.type == XFRM_DEV_OFFLOAD_UNSPECIFIED && x->encap))
412 return false;
413
414 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET ||
415 ((!dev || (dev == xfrm_dst_path(dst)->dev)) &&
416 !xdst->child->xfrm)) {
417 mtu = xfrm_state_mtu(x, xdst->child_mtu_cached);
418 if (skb->len <= mtu)
419 goto ok;
420
421 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
422 goto ok;
423 }
424
425 return false;
426
427ok:
428 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok)
429 return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x);
430
431 return true;
432}
433EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok);
434
435void xfrm_dev_resume(struct sk_buff *skb)
436{
437 struct net_device *dev = skb->dev;
438 int ret = NETDEV_TX_BUSY;
439 struct netdev_queue *txq;
440 struct softnet_data *sd;
441 unsigned long flags;
442
443 rcu_read_lock();
444 txq = netdev_core_pick_tx(dev, skb, NULL);
445
446 HARD_TX_LOCK(dev, txq, smp_processor_id());
447 if (!netif_xmit_frozen_or_stopped(txq))
448 skb = dev_hard_start_xmit(skb, dev, txq, &ret);
449 HARD_TX_UNLOCK(dev, txq);
450
451 if (!dev_xmit_complete(ret)) {
452 local_irq_save(flags);
453 sd = this_cpu_ptr(&softnet_data);
454 skb_queue_tail(&sd->xfrm_backlog, skb);
455 raise_softirq_irqoff(NET_TX_SOFTIRQ);
456 local_irq_restore(flags);
457 }
458 rcu_read_unlock();
459}
460EXPORT_SYMBOL_GPL(xfrm_dev_resume);
461
462void xfrm_dev_backlog(struct softnet_data *sd)
463{
464 struct sk_buff_head *xfrm_backlog = &sd->xfrm_backlog;
465 struct sk_buff_head list;
466 struct sk_buff *skb;
467
468 if (skb_queue_empty(xfrm_backlog))
469 return;
470
471 __skb_queue_head_init(&list);
472
473 spin_lock(&xfrm_backlog->lock);
474 skb_queue_splice_init(xfrm_backlog, &list);
475 spin_unlock(&xfrm_backlog->lock);
476
477 while (!skb_queue_empty(&list)) {
478 skb = __skb_dequeue(&list);
479 xfrm_dev_resume(skb);
480 }
481
482}
483#endif
484
485static int xfrm_api_check(struct net_device *dev)
486{
487#ifdef CONFIG_XFRM_OFFLOAD
488 if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) &&
489 !(dev->features & NETIF_F_HW_ESP))
490 return NOTIFY_BAD;
491
492 if ((dev->features & NETIF_F_HW_ESP) &&
493 (!(dev->xfrmdev_ops &&
494 dev->xfrmdev_ops->xdo_dev_state_add &&
495 dev->xfrmdev_ops->xdo_dev_state_delete)))
496 return NOTIFY_BAD;
497#else
498 if (dev->features & (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM))
499 return NOTIFY_BAD;
500#endif
501
502 return NOTIFY_DONE;
503}
504
505static int xfrm_dev_down(struct net_device *dev)
506{
507 if (dev->features & NETIF_F_HW_ESP) {
508 xfrm_dev_state_flush(dev_net(dev), dev, true);
509 xfrm_dev_policy_flush(dev_net(dev), dev, true);
510 }
511
512 return NOTIFY_DONE;
513}
514
515static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
516{
517 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
518
519 switch (event) {
520 case NETDEV_REGISTER:
521 return xfrm_api_check(dev);
522
523 case NETDEV_FEAT_CHANGE:
524 return xfrm_api_check(dev);
525
526 case NETDEV_DOWN:
527 case NETDEV_UNREGISTER:
528 return xfrm_dev_down(dev);
529 }
530 return NOTIFY_DONE;
531}
532
533static struct notifier_block xfrm_dev_notifier = {
534 .notifier_call = xfrm_dev_event,
535};
536
537void __init xfrm_dev_init(void)
538{
539 register_netdevice_notifier(&xfrm_dev_notifier);
540}