121f42cc9SSteffen Klassert /* 221f42cc9SSteffen Klassert * xfrm_device.c - IPsec device offloading code. 321f42cc9SSteffen Klassert * 421f42cc9SSteffen Klassert * Copyright (c) 2015 secunet Security Networks AG 521f42cc9SSteffen Klassert * 621f42cc9SSteffen Klassert * Author: 721f42cc9SSteffen Klassert * Steffen Klassert <steffen.klassert@secunet.com> 821f42cc9SSteffen Klassert * 921f42cc9SSteffen Klassert * This program is free software; you can redistribute it and/or 1021f42cc9SSteffen Klassert * modify it under the terms of the GNU General Public License 1121f42cc9SSteffen Klassert * as published by the Free Software Foundation; either version 1221f42cc9SSteffen Klassert * 2 of the License, or (at your option) any later version. 1321f42cc9SSteffen Klassert */ 1421f42cc9SSteffen Klassert 1521f42cc9SSteffen Klassert #include <linux/errno.h> 1621f42cc9SSteffen Klassert #include <linux/module.h> 1721f42cc9SSteffen Klassert #include <linux/netdevice.h> 1821f42cc9SSteffen Klassert #include <linux/skbuff.h> 1921f42cc9SSteffen Klassert #include <linux/slab.h> 2021f42cc9SSteffen Klassert #include <linux/spinlock.h> 2121f42cc9SSteffen Klassert #include <net/dst.h> 2221f42cc9SSteffen Klassert #include <net/xfrm.h> 2321f42cc9SSteffen Klassert #include <linux/notifier.h> 2421f42cc9SSteffen Klassert 25b81f884aSHangbin Liu #ifdef CONFIG_XFRM_OFFLOAD 26303c5fabSFlorian Westphal static void __xfrm_transport_prep(struct xfrm_state *x, struct sk_buff *skb, 27303c5fabSFlorian Westphal unsigned int hsize) 28303c5fabSFlorian Westphal { 29303c5fabSFlorian Westphal struct xfrm_offload *xo = xfrm_offload(skb); 30303c5fabSFlorian Westphal 31303c5fabSFlorian Westphal skb_reset_mac_len(skb); 32303c5fabSFlorian Westphal pskb_pull(skb, skb->mac_len + hsize + x->props.header_len); 33303c5fabSFlorian Westphal 34303c5fabSFlorian Westphal if (xo->flags & XFRM_GSO_SEGMENT) { 35303c5fabSFlorian Westphal skb_reset_transport_header(skb); 36303c5fabSFlorian Westphal skb->transport_header -= x->props.header_len; 37303c5fabSFlorian Westphal } 38303c5fabSFlorian Westphal } 39303c5fabSFlorian Westphal 40303c5fabSFlorian Westphal static void __xfrm_mode_tunnel_prep(struct xfrm_state *x, struct sk_buff *skb, 41303c5fabSFlorian Westphal unsigned int hsize) 42303c5fabSFlorian Westphal 43303c5fabSFlorian Westphal { 44303c5fabSFlorian Westphal struct xfrm_offload *xo = xfrm_offload(skb); 45303c5fabSFlorian Westphal 46303c5fabSFlorian Westphal if (xo->flags & XFRM_GSO_SEGMENT) 47303c5fabSFlorian Westphal skb->transport_header = skb->network_header + hsize; 48303c5fabSFlorian Westphal 49303c5fabSFlorian Westphal skb_reset_mac_len(skb); 50303c5fabSFlorian Westphal pskb_pull(skb, skb->mac_len + x->props.header_len); 51303c5fabSFlorian Westphal } 52303c5fabSFlorian Westphal 53303c5fabSFlorian Westphal /* Adjust pointers into the packet when IPsec is done at layer2 */ 54303c5fabSFlorian Westphal static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb) 55303c5fabSFlorian Westphal { 56c9500d7bSFlorian Westphal switch (x->outer_mode.encap) { 57303c5fabSFlorian Westphal case XFRM_MODE_TUNNEL: 58c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET) 59303c5fabSFlorian Westphal return __xfrm_mode_tunnel_prep(x, skb, 60303c5fabSFlorian Westphal sizeof(struct iphdr)); 61c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET6) 62303c5fabSFlorian Westphal return __xfrm_mode_tunnel_prep(x, skb, 63303c5fabSFlorian Westphal sizeof(struct ipv6hdr)); 64303c5fabSFlorian Westphal break; 65303c5fabSFlorian Westphal case XFRM_MODE_TRANSPORT: 66c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET) 67303c5fabSFlorian Westphal return __xfrm_transport_prep(x, skb, 68303c5fabSFlorian Westphal sizeof(struct iphdr)); 69c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET6) 70303c5fabSFlorian Westphal return __xfrm_transport_prep(x, skb, 71303c5fabSFlorian Westphal sizeof(struct ipv6hdr)); 72303c5fabSFlorian Westphal break; 73303c5fabSFlorian Westphal case XFRM_MODE_ROUTEOPTIMIZATION: 74303c5fabSFlorian Westphal case XFRM_MODE_IN_TRIGGER: 75303c5fabSFlorian Westphal case XFRM_MODE_BEET: 76303c5fabSFlorian Westphal break; 77303c5fabSFlorian Westphal } 78303c5fabSFlorian Westphal } 79303c5fabSFlorian Westphal 80f53c7239SSteffen Klassert struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 81f6e27114SSteffen Klassert { 82f6e27114SSteffen Klassert int err; 83f53c7239SSteffen Klassert unsigned long flags; 84f6e27114SSteffen Klassert struct xfrm_state *x; 853dca3f38SSteffen Klassert struct sk_buff *skb2; 86f53c7239SSteffen Klassert struct softnet_data *sd; 873dca3f38SSteffen Klassert netdev_features_t esp_features = features; 88f6e27114SSteffen Klassert struct xfrm_offload *xo = xfrm_offload(skb); 892294be0fSFlorian Westphal struct sec_path *sp; 90f6e27114SSteffen Klassert 913dca3f38SSteffen Klassert if (!xo) 923dca3f38SSteffen Klassert return skb; 93f6e27114SSteffen Klassert 943dca3f38SSteffen Klassert if (!(features & NETIF_F_HW_ESP)) 953dca3f38SSteffen Klassert esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK); 963dca3f38SSteffen Klassert 972294be0fSFlorian Westphal sp = skb_sec_path(skb); 982294be0fSFlorian Westphal x = sp->xvec[sp->len - 1]; 99f6e27114SSteffen Klassert if (xo->flags & XFRM_GRO || x->xso.flags & XFRM_OFFLOAD_INBOUND) 1003dca3f38SSteffen Klassert return skb; 101f6e27114SSteffen Klassert 102f53c7239SSteffen Klassert local_irq_save(flags); 103f53c7239SSteffen Klassert sd = this_cpu_ptr(&softnet_data); 104f53c7239SSteffen Klassert err = !skb_queue_empty(&sd->xfrm_backlog); 105f53c7239SSteffen Klassert local_irq_restore(flags); 106f53c7239SSteffen Klassert 107f53c7239SSteffen Klassert if (err) { 108f53c7239SSteffen Klassert *again = true; 109f53c7239SSteffen Klassert return skb; 110f53c7239SSteffen Klassert } 111f53c7239SSteffen Klassert 1123dca3f38SSteffen Klassert if (skb_is_gso(skb)) { 1133dca3f38SSteffen Klassert struct net_device *dev = skb->dev; 1143dca3f38SSteffen Klassert 115fcb662deSShannon Nelson if (unlikely(x->xso.dev != dev)) { 1163dca3f38SSteffen Klassert struct sk_buff *segs; 1173dca3f38SSteffen Klassert 1183dca3f38SSteffen Klassert /* Packet got rerouted, fixup features and segment it. */ 1193dca3f38SSteffen Klassert esp_features = esp_features & ~(NETIF_F_HW_ESP 1203dca3f38SSteffen Klassert | NETIF_F_GSO_ESP); 1213dca3f38SSteffen Klassert 1223dca3f38SSteffen Klassert segs = skb_gso_segment(skb, esp_features); 1233dca3f38SSteffen Klassert if (IS_ERR(segs)) { 1243dca3f38SSteffen Klassert kfree_skb(skb); 125f53c7239SSteffen Klassert atomic_long_inc(&dev->tx_dropped); 1263dca3f38SSteffen Klassert return NULL; 1273dca3f38SSteffen Klassert } else { 1283dca3f38SSteffen Klassert consume_skb(skb); 1293dca3f38SSteffen Klassert skb = segs; 1303dca3f38SSteffen Klassert } 1313dca3f38SSteffen Klassert } 1323dca3f38SSteffen Klassert } 1333dca3f38SSteffen Klassert 1343dca3f38SSteffen Klassert if (!skb->next) { 13565fd2c2aSBoris Pismenny esp_features |= skb->dev->gso_partial_features; 136303c5fabSFlorian Westphal xfrm_outer_mode_prep(x, skb); 137f6e27114SSteffen Klassert 138f53c7239SSteffen Klassert xo->flags |= XFRM_DEV_RESUME; 139f53c7239SSteffen Klassert 1403dca3f38SSteffen Klassert err = x->type_offload->xmit(x, skb, esp_features); 141f6e27114SSteffen Klassert if (err) { 142f53c7239SSteffen Klassert if (err == -EINPROGRESS) 143f53c7239SSteffen Klassert return NULL; 144f53c7239SSteffen Klassert 145f6e27114SSteffen Klassert XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); 1463dca3f38SSteffen Klassert kfree_skb(skb); 1473dca3f38SSteffen Klassert return NULL; 148f6e27114SSteffen Klassert } 149f6e27114SSteffen Klassert 150f6e27114SSteffen Klassert skb_push(skb, skb->data - skb_mac_header(skb)); 1513dca3f38SSteffen Klassert 1523dca3f38SSteffen Klassert return skb; 153f6e27114SSteffen Klassert } 154f6e27114SSteffen Klassert 1553dca3f38SSteffen Klassert skb2 = skb; 1563dca3f38SSteffen Klassert 1573dca3f38SSteffen Klassert do { 1583dca3f38SSteffen Klassert struct sk_buff *nskb = skb2->next; 15965fd2c2aSBoris Pismenny 16065fd2c2aSBoris Pismenny esp_features |= skb->dev->gso_partial_features; 161a8305bffSDavid S. Miller skb_mark_not_on_list(skb2); 1623dca3f38SSteffen Klassert 1633dca3f38SSteffen Klassert xo = xfrm_offload(skb2); 164f53c7239SSteffen Klassert xo->flags |= XFRM_DEV_RESUME; 1653dca3f38SSteffen Klassert 166303c5fabSFlorian Westphal xfrm_outer_mode_prep(x, skb2); 1673dca3f38SSteffen Klassert 1683dca3f38SSteffen Klassert err = x->type_offload->xmit(x, skb2, esp_features); 169f53c7239SSteffen Klassert if (!err) { 170f53c7239SSteffen Klassert skb2->next = nskb; 171f53c7239SSteffen Klassert } else if (err != -EINPROGRESS) { 1723dca3f38SSteffen Klassert XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); 1733dca3f38SSteffen Klassert skb2->next = nskb; 1743dca3f38SSteffen Klassert kfree_skb_list(skb2); 1753dca3f38SSteffen Klassert return NULL; 176f53c7239SSteffen Klassert } else { 177f53c7239SSteffen Klassert if (skb == skb2) 178f53c7239SSteffen Klassert skb = nskb; 1793dca3f38SSteffen Klassert 180f53c7239SSteffen Klassert if (!skb) 181f53c7239SSteffen Klassert return NULL; 182f53c7239SSteffen Klassert 183f53c7239SSteffen Klassert goto skip_push; 184f53c7239SSteffen Klassert } 1853dca3f38SSteffen Klassert 1863dca3f38SSteffen Klassert skb_push(skb2, skb2->data - skb_mac_header(skb2)); 1873dca3f38SSteffen Klassert 188f53c7239SSteffen Klassert skip_push: 1893dca3f38SSteffen Klassert skb2 = nskb; 1903dca3f38SSteffen Klassert } while (skb2); 1913dca3f38SSteffen Klassert 1923dca3f38SSteffen Klassert return skb; 193f6e27114SSteffen Klassert } 194f6e27114SSteffen Klassert EXPORT_SYMBOL_GPL(validate_xmit_xfrm); 195f6e27114SSteffen Klassert 196d77e38e6SSteffen Klassert int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 197d77e38e6SSteffen Klassert struct xfrm_user_offload *xuo) 198d77e38e6SSteffen Klassert { 199d77e38e6SSteffen Klassert int err; 200d77e38e6SSteffen Klassert struct dst_entry *dst; 201d77e38e6SSteffen Klassert struct net_device *dev; 202d77e38e6SSteffen Klassert struct xfrm_state_offload *xso = &x->xso; 203d77e38e6SSteffen Klassert xfrm_address_t *saddr; 204d77e38e6SSteffen Klassert xfrm_address_t *daddr; 205d77e38e6SSteffen Klassert 206d77e38e6SSteffen Klassert if (!x->type_offload) 207ffdb5211SIlan Tayari return -EINVAL; 208d77e38e6SSteffen Klassert 20950bd870aSYossef Efraim /* We don't yet support UDP encapsulation and TFC padding. */ 21050bd870aSYossef Efraim if (x->encap || x->tfcpad) 21143024b9cSYossef Efraim return -EINVAL; 212d77e38e6SSteffen Klassert 213d77e38e6SSteffen Klassert dev = dev_get_by_index(net, xuo->ifindex); 214d77e38e6SSteffen Klassert if (!dev) { 215d77e38e6SSteffen Klassert if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) { 216d77e38e6SSteffen Klassert saddr = &x->props.saddr; 217d77e38e6SSteffen Klassert daddr = &x->id.daddr; 218d77e38e6SSteffen Klassert } else { 219d77e38e6SSteffen Klassert saddr = &x->id.daddr; 220d77e38e6SSteffen Klassert daddr = &x->props.saddr; 221d77e38e6SSteffen Klassert } 222d77e38e6SSteffen Klassert 223077fbac4SLorenzo Colitti dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr, 2249b42c1f1SSteffen Klassert x->props.family, 2259b42c1f1SSteffen Klassert xfrm_smark_get(0, x)); 226d77e38e6SSteffen Klassert if (IS_ERR(dst)) 227d77e38e6SSteffen Klassert return 0; 228d77e38e6SSteffen Klassert 229d77e38e6SSteffen Klassert dev = dst->dev; 230d77e38e6SSteffen Klassert 231d77e38e6SSteffen Klassert dev_hold(dev); 232d77e38e6SSteffen Klassert dst_release(dst); 233d77e38e6SSteffen Klassert } 234d77e38e6SSteffen Klassert 235d77e38e6SSteffen Klassert if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_state_add) { 23667a63387SSteffen Klassert xso->dev = NULL; 237d77e38e6SSteffen Klassert dev_put(dev); 238d77e38e6SSteffen Klassert return 0; 239d77e38e6SSteffen Klassert } 240d77e38e6SSteffen Klassert 24150bd870aSYossef Efraim if (x->props.flags & XFRM_STATE_ESN && 24250bd870aSYossef Efraim !dev->xfrmdev_ops->xdo_dev_state_advance_esn) { 24350bd870aSYossef Efraim xso->dev = NULL; 24450bd870aSYossef Efraim dev_put(dev); 24550bd870aSYossef Efraim return -EINVAL; 24650bd870aSYossef Efraim } 24750bd870aSYossef Efraim 248d77e38e6SSteffen Klassert xso->dev = dev; 249d77e38e6SSteffen Klassert xso->num_exthdrs = 1; 250d77e38e6SSteffen Klassert xso->flags = xuo->flags; 251d77e38e6SSteffen Klassert 252d77e38e6SSteffen Klassert err = dev->xfrmdev_ops->xdo_dev_state_add(x); 253d77e38e6SSteffen Klassert if (err) { 2544a132095SShannon Nelson xso->num_exthdrs = 0; 2554a132095SShannon Nelson xso->flags = 0; 256aa5dd6faSAviad Yehezkel xso->dev = NULL; 257d77e38e6SSteffen Klassert dev_put(dev); 2584a132095SShannon Nelson 2594a132095SShannon Nelson if (err != -EOPNOTSUPP) 260d77e38e6SSteffen Klassert return err; 261d77e38e6SSteffen Klassert } 262d77e38e6SSteffen Klassert 263d77e38e6SSteffen Klassert return 0; 264d77e38e6SSteffen Klassert } 265d77e38e6SSteffen Klassert EXPORT_SYMBOL_GPL(xfrm_dev_state_add); 266d77e38e6SSteffen Klassert 267d77e38e6SSteffen Klassert bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 268d77e38e6SSteffen Klassert { 269d77e38e6SSteffen Klassert int mtu; 270d77e38e6SSteffen Klassert struct dst_entry *dst = skb_dst(skb); 271d77e38e6SSteffen Klassert struct xfrm_dst *xdst = (struct xfrm_dst *)dst; 272d77e38e6SSteffen Klassert struct net_device *dev = x->xso.dev; 273d77e38e6SSteffen Klassert 274d77e38e6SSteffen Klassert if (!x->type_offload || x->encap) 275d77e38e6SSteffen Klassert return false; 276d77e38e6SSteffen Klassert 277fcb662deSShannon Nelson if ((!dev || (dev == xfrm_dst_path(dst)->dev)) && 278c7b37c76SFlorian Westphal (!xdst->child->xfrm)) { 279c7b37c76SFlorian Westphal mtu = xfrm_state_mtu(x, xdst->child_mtu_cached); 280d77e38e6SSteffen Klassert if (skb->len <= mtu) 281d77e38e6SSteffen Klassert goto ok; 282d77e38e6SSteffen Klassert 283779b7931SDaniel Axtens if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) 284d77e38e6SSteffen Klassert goto ok; 285d77e38e6SSteffen Klassert } 286d77e38e6SSteffen Klassert 287d77e38e6SSteffen Klassert return false; 288d77e38e6SSteffen Klassert 289d77e38e6SSteffen Klassert ok: 290d77e38e6SSteffen Klassert if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok) 291d77e38e6SSteffen Klassert return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x); 292d77e38e6SSteffen Klassert 293d77e38e6SSteffen Klassert return true; 294d77e38e6SSteffen Klassert } 295d77e38e6SSteffen Klassert EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok); 296f53c7239SSteffen Klassert 297f53c7239SSteffen Klassert void xfrm_dev_resume(struct sk_buff *skb) 298f53c7239SSteffen Klassert { 299f53c7239SSteffen Klassert struct net_device *dev = skb->dev; 300f53c7239SSteffen Klassert int ret = NETDEV_TX_BUSY; 301f53c7239SSteffen Klassert struct netdev_queue *txq; 302f53c7239SSteffen Klassert struct softnet_data *sd; 303f53c7239SSteffen Klassert unsigned long flags; 304f53c7239SSteffen Klassert 305f53c7239SSteffen Klassert rcu_read_lock(); 3064bd97d51SPaolo Abeni txq = netdev_core_pick_tx(dev, skb, NULL); 307f53c7239SSteffen Klassert 308f53c7239SSteffen Klassert HARD_TX_LOCK(dev, txq, smp_processor_id()); 309f53c7239SSteffen Klassert if (!netif_xmit_frozen_or_stopped(txq)) 310f53c7239SSteffen Klassert skb = dev_hard_start_xmit(skb, dev, txq, &ret); 311f53c7239SSteffen Klassert HARD_TX_UNLOCK(dev, txq); 312f53c7239SSteffen Klassert 313f53c7239SSteffen Klassert if (!dev_xmit_complete(ret)) { 314f53c7239SSteffen Klassert local_irq_save(flags); 315f53c7239SSteffen Klassert sd = this_cpu_ptr(&softnet_data); 316f53c7239SSteffen Klassert skb_queue_tail(&sd->xfrm_backlog, skb); 317f53c7239SSteffen Klassert raise_softirq_irqoff(NET_TX_SOFTIRQ); 318f53c7239SSteffen Klassert local_irq_restore(flags); 319f53c7239SSteffen Klassert } 320f53c7239SSteffen Klassert rcu_read_unlock(); 321f53c7239SSteffen Klassert } 322f53c7239SSteffen Klassert EXPORT_SYMBOL_GPL(xfrm_dev_resume); 323f53c7239SSteffen Klassert 324f53c7239SSteffen Klassert void xfrm_dev_backlog(struct softnet_data *sd) 325f53c7239SSteffen Klassert { 326f53c7239SSteffen Klassert struct sk_buff_head *xfrm_backlog = &sd->xfrm_backlog; 327f53c7239SSteffen Klassert struct sk_buff_head list; 328f53c7239SSteffen Klassert struct sk_buff *skb; 329f53c7239SSteffen Klassert 330f53c7239SSteffen Klassert if (skb_queue_empty(xfrm_backlog)) 331f53c7239SSteffen Klassert return; 332f53c7239SSteffen Klassert 333f53c7239SSteffen Klassert __skb_queue_head_init(&list); 334f53c7239SSteffen Klassert 335f53c7239SSteffen Klassert spin_lock(&xfrm_backlog->lock); 336f53c7239SSteffen Klassert skb_queue_splice_init(xfrm_backlog, &list); 337f53c7239SSteffen Klassert spin_unlock(&xfrm_backlog->lock); 338f53c7239SSteffen Klassert 339f53c7239SSteffen Klassert while (!skb_queue_empty(&list)) { 340f53c7239SSteffen Klassert skb = __skb_dequeue(&list); 341f53c7239SSteffen Klassert xfrm_dev_resume(skb); 342f53c7239SSteffen Klassert } 343f53c7239SSteffen Klassert 344f53c7239SSteffen Klassert } 345b81f884aSHangbin Liu #endif 346d77e38e6SSteffen Klassert 34792a23206SShannon Nelson static int xfrm_api_check(struct net_device *dev) 348d77e38e6SSteffen Klassert { 34992a23206SShannon Nelson #ifdef CONFIG_XFRM_OFFLOAD 350d77e38e6SSteffen Klassert if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) && 351d77e38e6SSteffen Klassert !(dev->features & NETIF_F_HW_ESP)) 352d77e38e6SSteffen Klassert return NOTIFY_BAD; 353d77e38e6SSteffen Klassert 35492a23206SShannon Nelson if ((dev->features & NETIF_F_HW_ESP) && 35592a23206SShannon Nelson (!(dev->xfrmdev_ops && 35692a23206SShannon Nelson dev->xfrmdev_ops->xdo_dev_state_add && 35792a23206SShannon Nelson dev->xfrmdev_ops->xdo_dev_state_delete))) 35892a23206SShannon Nelson return NOTIFY_BAD; 35992a23206SShannon Nelson #else 36092a23206SShannon Nelson if (dev->features & (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM)) 36192a23206SShannon Nelson return NOTIFY_BAD; 36292a23206SShannon Nelson #endif 36392a23206SShannon Nelson 364d77e38e6SSteffen Klassert return NOTIFY_DONE; 365d77e38e6SSteffen Klassert } 366d77e38e6SSteffen Klassert 36792a23206SShannon Nelson static int xfrm_dev_register(struct net_device *dev) 36892a23206SShannon Nelson { 36992a23206SShannon Nelson return xfrm_api_check(dev); 37092a23206SShannon Nelson } 37192a23206SShannon Nelson 372d77e38e6SSteffen Klassert static int xfrm_dev_feat_change(struct net_device *dev) 373d77e38e6SSteffen Klassert { 37492a23206SShannon Nelson return xfrm_api_check(dev); 375d77e38e6SSteffen Klassert } 376d77e38e6SSteffen Klassert 377d77e38e6SSteffen Klassert static int xfrm_dev_down(struct net_device *dev) 378d77e38e6SSteffen Klassert { 3792c1497bbSIlan Tayari if (dev->features & NETIF_F_HW_ESP) 380d77e38e6SSteffen Klassert xfrm_dev_state_flush(dev_net(dev), dev, true); 381d77e38e6SSteffen Klassert 382d77e38e6SSteffen Klassert return NOTIFY_DONE; 383d77e38e6SSteffen Klassert } 384d77e38e6SSteffen Klassert 38521f42cc9SSteffen Klassert static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) 38621f42cc9SSteffen Klassert { 38721f42cc9SSteffen Klassert struct net_device *dev = netdev_notifier_info_to_dev(ptr); 38821f42cc9SSteffen Klassert 38921f42cc9SSteffen Klassert switch (event) { 390d77e38e6SSteffen Klassert case NETDEV_REGISTER: 391d77e38e6SSteffen Klassert return xfrm_dev_register(dev); 392d77e38e6SSteffen Klassert 393d77e38e6SSteffen Klassert case NETDEV_FEAT_CHANGE: 394d77e38e6SSteffen Klassert return xfrm_dev_feat_change(dev); 395d77e38e6SSteffen Klassert 39621f42cc9SSteffen Klassert case NETDEV_DOWN: 397d77e38e6SSteffen Klassert return xfrm_dev_down(dev); 39821f42cc9SSteffen Klassert } 39921f42cc9SSteffen Klassert return NOTIFY_DONE; 40021f42cc9SSteffen Klassert } 40121f42cc9SSteffen Klassert 40221f42cc9SSteffen Klassert static struct notifier_block xfrm_dev_notifier = { 40321f42cc9SSteffen Klassert .notifier_call = xfrm_dev_event, 40421f42cc9SSteffen Klassert }; 40521f42cc9SSteffen Klassert 406e9a441b6SKirill Tkhai void __init xfrm_dev_init(void) 40721f42cc9SSteffen Klassert { 40821f42cc9SSteffen Klassert register_netdevice_notifier(&xfrm_dev_notifier); 40921f42cc9SSteffen Klassert } 410