1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * xfrm_device.c - IPsec device offloading code.
5 * Copyright (c) 2015 secunet Security Networks AG
8 * Steffen Klassert <steffen.klassert@secunet.com>
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>
19 #include <linux/notifier.h>
21 #ifdef CONFIG_XFRM_OFFLOAD
22 static void __xfrm_transport_prep(struct xfrm_state *x, struct sk_buff *skb,
25 struct xfrm_offload *xo = xfrm_offload(skb);
27 skb_reset_mac_len(skb);
28 if (xo->flags & XFRM_GSO_SEGMENT)
29 skb->transport_header -= x->props.header_len;
31 pskb_pull(skb, skb_transport_offset(skb) + x->props.header_len);
34 static void __xfrm_mode_tunnel_prep(struct xfrm_state *x, struct sk_buff *skb,
38 struct xfrm_offload *xo = xfrm_offload(skb);
40 if (xo->flags & XFRM_GSO_SEGMENT)
41 skb->transport_header = skb->network_header + hsize;
43 skb_reset_mac_len(skb);
44 pskb_pull(skb, skb->mac_len + x->props.header_len);
47 static void __xfrm_mode_beet_prep(struct xfrm_state *x, struct sk_buff *skb,
50 struct xfrm_offload *xo = xfrm_offload(skb);
53 if (xo->flags & XFRM_GSO_SEGMENT)
54 skb->transport_header = skb->network_header + hsize;
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);
63 pskb_pull(skb, skb->mac_len + hsize + (x->props.header_len - phlen));
66 /* Adjust pointers into the packet when IPsec is done at layer2 */
67 static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb)
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));
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));
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));
94 case XFRM_MODE_ROUTEOPTIMIZATION:
95 case XFRM_MODE_IN_TRIGGER:
100 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
104 struct xfrm_state *x;
105 struct softnet_data *sd;
106 struct sk_buff *skb2, *nskb, *pskb = NULL;
107 netdev_features_t esp_features = features;
108 struct xfrm_offload *xo = xfrm_offload(skb);
109 struct net_device *dev = skb->dev;
112 if (!xo || (xo->flags & XFRM_XMIT))
115 if (!(features & NETIF_F_HW_ESP))
116 esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
118 sp = skb_sec_path(skb);
119 x = sp->xvec[sp->len - 1];
120 if (xo->flags & XFRM_GRO || x->xso.flags & XFRM_OFFLOAD_INBOUND)
123 /* This skb was already validated on the upper/virtual dev */
124 if ((x->xso.dev != dev) && (x->xso.real_dev == dev))
127 local_irq_save(flags);
128 sd = this_cpu_ptr(&softnet_data);
129 err = !skb_queue_empty(&sd->xfrm_backlog);
130 local_irq_restore(flags);
137 xo->flags |= XFRM_XMIT;
139 if (skb_is_gso(skb) && unlikely(x->xso.dev != dev)) {
140 struct sk_buff *segs;
142 /* Packet got rerouted, fixup features and segment it. */
143 esp_features = esp_features & ~(NETIF_F_HW_ESP | NETIF_F_GSO_ESP);
145 segs = skb_gso_segment(skb, esp_features);
148 atomic_long_inc(&dev->tx_dropped);
157 esp_features |= skb->dev->gso_partial_features;
158 xfrm_outer_mode_prep(x, skb);
160 xo->flags |= XFRM_DEV_RESUME;
162 err = x->type_offload->xmit(x, skb, esp_features);
164 if (err == -EINPROGRESS)
167 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
172 skb_push(skb, skb->data - skb_mac_header(skb));
177 skb_list_walk_safe(skb, skb2, nskb) {
178 esp_features |= skb->dev->gso_partial_features;
179 skb_mark_not_on_list(skb2);
181 xo = xfrm_offload(skb2);
182 xo->flags |= XFRM_DEV_RESUME;
184 xfrm_outer_mode_prep(x, skb2);
186 err = x->type_offload->xmit(x, skb2, esp_features);
189 } else if (err != -EINPROGRESS) {
190 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
192 kfree_skb_list(skb2);
203 skb_push(skb2, skb2->data - skb_mac_header(skb2));
209 EXPORT_SYMBOL_GPL(validate_xmit_xfrm);
211 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
212 struct xfrm_user_offload *xuo)
215 struct dst_entry *dst;
216 struct net_device *dev;
217 struct xfrm_state_offload *xso = &x->xso;
218 xfrm_address_t *saddr;
219 xfrm_address_t *daddr;
221 if (!x->type_offload)
224 /* We don't yet support UDP encapsulation and TFC padding. */
225 if (x->encap || x->tfcpad)
228 dev = dev_get_by_index(net, xuo->ifindex);
230 if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) {
231 saddr = &x->props.saddr;
232 daddr = &x->id.daddr;
234 saddr = &x->id.daddr;
235 daddr = &x->props.saddr;
238 dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr,
240 xfrm_smark_get(0, x));
250 if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_state_add) {
256 if (x->props.flags & XFRM_STATE_ESN &&
257 !dev->xfrmdev_ops->xdo_dev_state_advance_esn) {
265 xso->num_exthdrs = 1;
266 xso->flags = xuo->flags;
268 err = dev->xfrmdev_ops->xdo_dev_state_add(x);
270 xso->num_exthdrs = 0;
275 if (err != -EOPNOTSUPP)
281 EXPORT_SYMBOL_GPL(xfrm_dev_state_add);
283 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
286 struct dst_entry *dst = skb_dst(skb);
287 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
288 struct net_device *dev = x->xso.dev;
290 if (!x->type_offload || x->encap)
293 if ((!dev || (dev == xfrm_dst_path(dst)->dev)) &&
294 (!xdst->child->xfrm)) {
295 mtu = xfrm_state_mtu(x, xdst->child_mtu_cached);
299 if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
306 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok)
307 return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x);
311 EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok);
313 void xfrm_dev_resume(struct sk_buff *skb)
315 struct net_device *dev = skb->dev;
316 int ret = NETDEV_TX_BUSY;
317 struct netdev_queue *txq;
318 struct softnet_data *sd;
322 txq = netdev_core_pick_tx(dev, skb, NULL);
324 HARD_TX_LOCK(dev, txq, smp_processor_id());
325 if (!netif_xmit_frozen_or_stopped(txq))
326 skb = dev_hard_start_xmit(skb, dev, txq, &ret);
327 HARD_TX_UNLOCK(dev, txq);
329 if (!dev_xmit_complete(ret)) {
330 local_irq_save(flags);
331 sd = this_cpu_ptr(&softnet_data);
332 skb_queue_tail(&sd->xfrm_backlog, skb);
333 raise_softirq_irqoff(NET_TX_SOFTIRQ);
334 local_irq_restore(flags);
338 EXPORT_SYMBOL_GPL(xfrm_dev_resume);
340 void xfrm_dev_backlog(struct softnet_data *sd)
342 struct sk_buff_head *xfrm_backlog = &sd->xfrm_backlog;
343 struct sk_buff_head list;
346 if (skb_queue_empty(xfrm_backlog))
349 __skb_queue_head_init(&list);
351 spin_lock(&xfrm_backlog->lock);
352 skb_queue_splice_init(xfrm_backlog, &list);
353 spin_unlock(&xfrm_backlog->lock);
355 while (!skb_queue_empty(&list)) {
356 skb = __skb_dequeue(&list);
357 xfrm_dev_resume(skb);
363 static int xfrm_api_check(struct net_device *dev)
365 #ifdef CONFIG_XFRM_OFFLOAD
366 if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) &&
367 !(dev->features & NETIF_F_HW_ESP))
370 if ((dev->features & NETIF_F_HW_ESP) &&
371 (!(dev->xfrmdev_ops &&
372 dev->xfrmdev_ops->xdo_dev_state_add &&
373 dev->xfrmdev_ops->xdo_dev_state_delete)))
376 if (dev->features & (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM))
383 static int xfrm_dev_register(struct net_device *dev)
385 return xfrm_api_check(dev);
388 static int xfrm_dev_feat_change(struct net_device *dev)
390 return xfrm_api_check(dev);
393 static int xfrm_dev_down(struct net_device *dev)
395 if (dev->features & NETIF_F_HW_ESP)
396 xfrm_dev_state_flush(dev_net(dev), dev, true);
401 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
403 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
406 case NETDEV_REGISTER:
407 return xfrm_dev_register(dev);
409 case NETDEV_FEAT_CHANGE:
410 return xfrm_dev_feat_change(dev);
413 case NETDEV_UNREGISTER:
414 return xfrm_dev_down(dev);
419 static struct notifier_block xfrm_dev_notifier = {
420 .notifier_call = xfrm_dev_event,
423 void __init xfrm_dev_init(void)
425 register_netdevice_notifier(&xfrm_dev_notifier);