12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 221f42cc9SSteffen Klassert /* 321f42cc9SSteffen Klassert * xfrm_device.c - IPsec device offloading code. 421f42cc9SSteffen Klassert * 521f42cc9SSteffen Klassert * Copyright (c) 2015 secunet Security Networks AG 621f42cc9SSteffen Klassert * 721f42cc9SSteffen Klassert * Author: 821f42cc9SSteffen Klassert * Steffen Klassert <steffen.klassert@secunet.com> 921f42cc9SSteffen Klassert */ 1021f42cc9SSteffen Klassert 1121f42cc9SSteffen Klassert #include <linux/errno.h> 1221f42cc9SSteffen Klassert #include <linux/module.h> 1321f42cc9SSteffen Klassert #include <linux/netdevice.h> 1421f42cc9SSteffen Klassert #include <linux/skbuff.h> 1521f42cc9SSteffen Klassert #include <linux/slab.h> 1621f42cc9SSteffen Klassert #include <linux/spinlock.h> 1721f42cc9SSteffen Klassert #include <net/dst.h> 1821f42cc9SSteffen Klassert #include <net/xfrm.h> 1921f42cc9SSteffen Klassert #include <linux/notifier.h> 2021f42cc9SSteffen Klassert 21b81f884aSHangbin Liu #ifdef CONFIG_XFRM_OFFLOAD 22303c5fabSFlorian Westphal static void __xfrm_transport_prep(struct xfrm_state *x, struct sk_buff *skb, 23303c5fabSFlorian Westphal unsigned int hsize) 24303c5fabSFlorian Westphal { 25303c5fabSFlorian Westphal struct xfrm_offload *xo = xfrm_offload(skb); 26303c5fabSFlorian Westphal 27303c5fabSFlorian Westphal skb_reset_mac_len(skb); 28303c5fabSFlorian Westphal pskb_pull(skb, skb->mac_len + hsize + x->props.header_len); 29303c5fabSFlorian Westphal 30303c5fabSFlorian Westphal if (xo->flags & XFRM_GSO_SEGMENT) { 31303c5fabSFlorian Westphal skb_reset_transport_header(skb); 32303c5fabSFlorian Westphal skb->transport_header -= x->props.header_len; 33303c5fabSFlorian Westphal } 34303c5fabSFlorian Westphal } 35303c5fabSFlorian Westphal 36303c5fabSFlorian Westphal static void __xfrm_mode_tunnel_prep(struct xfrm_state *x, struct sk_buff *skb, 37303c5fabSFlorian Westphal unsigned int hsize) 38303c5fabSFlorian Westphal 39303c5fabSFlorian Westphal { 40303c5fabSFlorian Westphal struct xfrm_offload *xo = xfrm_offload(skb); 41303c5fabSFlorian Westphal 42303c5fabSFlorian Westphal if (xo->flags & XFRM_GSO_SEGMENT) 43303c5fabSFlorian Westphal skb->transport_header = skb->network_header + hsize; 44303c5fabSFlorian Westphal 45303c5fabSFlorian Westphal skb_reset_mac_len(skb); 46303c5fabSFlorian Westphal pskb_pull(skb, skb->mac_len + x->props.header_len); 47303c5fabSFlorian Westphal } 48303c5fabSFlorian Westphal 49303c5fabSFlorian Westphal /* Adjust pointers into the packet when IPsec is done at layer2 */ 50303c5fabSFlorian Westphal static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb) 51303c5fabSFlorian Westphal { 52c9500d7bSFlorian Westphal switch (x->outer_mode.encap) { 53303c5fabSFlorian Westphal case XFRM_MODE_TUNNEL: 54c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET) 55303c5fabSFlorian Westphal return __xfrm_mode_tunnel_prep(x, skb, 56303c5fabSFlorian Westphal sizeof(struct iphdr)); 57c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET6) 58303c5fabSFlorian Westphal return __xfrm_mode_tunnel_prep(x, skb, 59303c5fabSFlorian Westphal sizeof(struct ipv6hdr)); 60303c5fabSFlorian Westphal break; 61303c5fabSFlorian Westphal case XFRM_MODE_TRANSPORT: 62c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET) 63303c5fabSFlorian Westphal return __xfrm_transport_prep(x, skb, 64303c5fabSFlorian Westphal sizeof(struct iphdr)); 65c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET6) 66303c5fabSFlorian Westphal return __xfrm_transport_prep(x, skb, 67303c5fabSFlorian Westphal sizeof(struct ipv6hdr)); 68303c5fabSFlorian Westphal break; 69303c5fabSFlorian Westphal case XFRM_MODE_ROUTEOPTIMIZATION: 70303c5fabSFlorian Westphal case XFRM_MODE_IN_TRIGGER: 71303c5fabSFlorian Westphal case XFRM_MODE_BEET: 72303c5fabSFlorian Westphal break; 73303c5fabSFlorian Westphal } 74303c5fabSFlorian Westphal } 75303c5fabSFlorian Westphal 76f53c7239SSteffen Klassert struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 77f6e27114SSteffen Klassert { 78f6e27114SSteffen Klassert int err; 79f53c7239SSteffen Klassert unsigned long flags; 80f6e27114SSteffen Klassert struct xfrm_state *x; 81f53c7239SSteffen Klassert struct softnet_data *sd; 82d1d17a35SXin Long struct sk_buff *skb2, *nskb, *pskb = NULL; 833dca3f38SSteffen Klassert netdev_features_t esp_features = features; 84f6e27114SSteffen Klassert struct xfrm_offload *xo = xfrm_offload(skb); 852294be0fSFlorian Westphal struct sec_path *sp; 86f6e27114SSteffen Klassert 873dca3f38SSteffen Klassert if (!xo) 883dca3f38SSteffen Klassert return skb; 89f6e27114SSteffen Klassert 903dca3f38SSteffen Klassert if (!(features & NETIF_F_HW_ESP)) 913dca3f38SSteffen Klassert esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK); 923dca3f38SSteffen Klassert 932294be0fSFlorian Westphal sp = skb_sec_path(skb); 942294be0fSFlorian Westphal x = sp->xvec[sp->len - 1]; 95f6e27114SSteffen Klassert if (xo->flags & XFRM_GRO || x->xso.flags & XFRM_OFFLOAD_INBOUND) 963dca3f38SSteffen Klassert return skb; 97f6e27114SSteffen Klassert 98f53c7239SSteffen Klassert local_irq_save(flags); 99f53c7239SSteffen Klassert sd = this_cpu_ptr(&softnet_data); 100f53c7239SSteffen Klassert err = !skb_queue_empty(&sd->xfrm_backlog); 101f53c7239SSteffen Klassert local_irq_restore(flags); 102f53c7239SSteffen Klassert 103f53c7239SSteffen Klassert if (err) { 104f53c7239SSteffen Klassert *again = true; 105f53c7239SSteffen Klassert return skb; 106f53c7239SSteffen Klassert } 107f53c7239SSteffen Klassert 1083dca3f38SSteffen Klassert if (skb_is_gso(skb)) { 1093dca3f38SSteffen Klassert struct net_device *dev = skb->dev; 1103dca3f38SSteffen Klassert 111fcb662deSShannon Nelson if (unlikely(x->xso.dev != dev)) { 1123dca3f38SSteffen Klassert struct sk_buff *segs; 1133dca3f38SSteffen Klassert 1143dca3f38SSteffen Klassert /* Packet got rerouted, fixup features and segment it. */ 1153dca3f38SSteffen Klassert esp_features = esp_features & ~(NETIF_F_HW_ESP 1163dca3f38SSteffen Klassert | NETIF_F_GSO_ESP); 1173dca3f38SSteffen Klassert 1183dca3f38SSteffen Klassert segs = skb_gso_segment(skb, esp_features); 1193dca3f38SSteffen Klassert if (IS_ERR(segs)) { 1203dca3f38SSteffen Klassert kfree_skb(skb); 121f53c7239SSteffen Klassert atomic_long_inc(&dev->tx_dropped); 1223dca3f38SSteffen Klassert return NULL; 1233dca3f38SSteffen Klassert } else { 1243dca3f38SSteffen Klassert consume_skb(skb); 1253dca3f38SSteffen Klassert skb = segs; 1263dca3f38SSteffen Klassert } 1273dca3f38SSteffen Klassert } 1283dca3f38SSteffen Klassert } 1293dca3f38SSteffen Klassert 1303dca3f38SSteffen Klassert if (!skb->next) { 13165fd2c2aSBoris Pismenny esp_features |= skb->dev->gso_partial_features; 132303c5fabSFlorian Westphal xfrm_outer_mode_prep(x, skb); 133f6e27114SSteffen Klassert 134f53c7239SSteffen Klassert xo->flags |= XFRM_DEV_RESUME; 135f53c7239SSteffen Klassert 1363dca3f38SSteffen Klassert err = x->type_offload->xmit(x, skb, esp_features); 137f6e27114SSteffen Klassert if (err) { 138f53c7239SSteffen Klassert if (err == -EINPROGRESS) 139f53c7239SSteffen Klassert return NULL; 140f53c7239SSteffen Klassert 141f6e27114SSteffen Klassert XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); 1423dca3f38SSteffen Klassert kfree_skb(skb); 1433dca3f38SSteffen Klassert return NULL; 144f6e27114SSteffen Klassert } 145f6e27114SSteffen Klassert 146f6e27114SSteffen Klassert skb_push(skb, skb->data - skb_mac_header(skb)); 1473dca3f38SSteffen Klassert 1483dca3f38SSteffen Klassert return skb; 149f6e27114SSteffen Klassert } 150f6e27114SSteffen Klassert 151c3b18e0dSJason A. Donenfeld skb_list_walk_safe(skb, skb2, nskb) { 15265fd2c2aSBoris Pismenny esp_features |= skb->dev->gso_partial_features; 153a8305bffSDavid S. Miller skb_mark_not_on_list(skb2); 1543dca3f38SSteffen Klassert 1553dca3f38SSteffen Klassert xo = xfrm_offload(skb2); 156f53c7239SSteffen Klassert xo->flags |= XFRM_DEV_RESUME; 1573dca3f38SSteffen Klassert 158303c5fabSFlorian Westphal xfrm_outer_mode_prep(x, skb2); 1593dca3f38SSteffen Klassert 1603dca3f38SSteffen Klassert err = x->type_offload->xmit(x, skb2, esp_features); 161f53c7239SSteffen Klassert if (!err) { 162f53c7239SSteffen Klassert skb2->next = nskb; 163f53c7239SSteffen Klassert } else if (err != -EINPROGRESS) { 1643dca3f38SSteffen Klassert XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); 1653dca3f38SSteffen Klassert skb2->next = nskb; 1663dca3f38SSteffen Klassert kfree_skb_list(skb2); 1673dca3f38SSteffen Klassert return NULL; 168f53c7239SSteffen Klassert } else { 169f53c7239SSteffen Klassert if (skb == skb2) 170f53c7239SSteffen Klassert skb = nskb; 171d1d17a35SXin Long else 172d1d17a35SXin Long pskb->next = nskb; 173f53c7239SSteffen Klassert 174c3b18e0dSJason A. Donenfeld continue; 175f53c7239SSteffen Klassert } 1763dca3f38SSteffen Klassert 1773dca3f38SSteffen Klassert skb_push(skb2, skb2->data - skb_mac_header(skb2)); 178d1d17a35SXin Long pskb = skb2; 179c3b18e0dSJason A. Donenfeld } 1803dca3f38SSteffen Klassert 1813dca3f38SSteffen Klassert return skb; 182f6e27114SSteffen Klassert } 183f6e27114SSteffen Klassert EXPORT_SYMBOL_GPL(validate_xmit_xfrm); 184f6e27114SSteffen Klassert 185d77e38e6SSteffen Klassert int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 186d77e38e6SSteffen Klassert struct xfrm_user_offload *xuo) 187d77e38e6SSteffen Klassert { 188d77e38e6SSteffen Klassert int err; 189d77e38e6SSteffen Klassert struct dst_entry *dst; 190d77e38e6SSteffen Klassert struct net_device *dev; 191d77e38e6SSteffen Klassert struct xfrm_state_offload *xso = &x->xso; 192d77e38e6SSteffen Klassert xfrm_address_t *saddr; 193d77e38e6SSteffen Klassert xfrm_address_t *daddr; 194d77e38e6SSteffen Klassert 195d77e38e6SSteffen Klassert if (!x->type_offload) 196ffdb5211SIlan Tayari return -EINVAL; 197d77e38e6SSteffen Klassert 19850bd870aSYossef Efraim /* We don't yet support UDP encapsulation and TFC padding. */ 19950bd870aSYossef Efraim if (x->encap || x->tfcpad) 20043024b9cSYossef Efraim return -EINVAL; 201d77e38e6SSteffen Klassert 202d77e38e6SSteffen Klassert dev = dev_get_by_index(net, xuo->ifindex); 203d77e38e6SSteffen Klassert if (!dev) { 204d77e38e6SSteffen Klassert if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) { 205d77e38e6SSteffen Klassert saddr = &x->props.saddr; 206d77e38e6SSteffen Klassert daddr = &x->id.daddr; 207d77e38e6SSteffen Klassert } else { 208d77e38e6SSteffen Klassert saddr = &x->id.daddr; 209d77e38e6SSteffen Klassert daddr = &x->props.saddr; 210d77e38e6SSteffen Klassert } 211d77e38e6SSteffen Klassert 212077fbac4SLorenzo Colitti dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr, 2139b42c1f1SSteffen Klassert x->props.family, 2149b42c1f1SSteffen Klassert xfrm_smark_get(0, x)); 215d77e38e6SSteffen Klassert if (IS_ERR(dst)) 216d77e38e6SSteffen Klassert return 0; 217d77e38e6SSteffen Klassert 218d77e38e6SSteffen Klassert dev = dst->dev; 219d77e38e6SSteffen Klassert 220d77e38e6SSteffen Klassert dev_hold(dev); 221d77e38e6SSteffen Klassert dst_release(dst); 222d77e38e6SSteffen Klassert } 223d77e38e6SSteffen Klassert 224d77e38e6SSteffen Klassert if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_state_add) { 22567a63387SSteffen Klassert xso->dev = NULL; 226d77e38e6SSteffen Klassert dev_put(dev); 227d77e38e6SSteffen Klassert return 0; 228d77e38e6SSteffen Klassert } 229d77e38e6SSteffen Klassert 23050bd870aSYossef Efraim if (x->props.flags & XFRM_STATE_ESN && 23150bd870aSYossef Efraim !dev->xfrmdev_ops->xdo_dev_state_advance_esn) { 23250bd870aSYossef Efraim xso->dev = NULL; 23350bd870aSYossef Efraim dev_put(dev); 23450bd870aSYossef Efraim return -EINVAL; 23550bd870aSYossef Efraim } 23650bd870aSYossef Efraim 237d77e38e6SSteffen Klassert xso->dev = dev; 238d77e38e6SSteffen Klassert xso->num_exthdrs = 1; 239d77e38e6SSteffen Klassert xso->flags = xuo->flags; 240d77e38e6SSteffen Klassert 241d77e38e6SSteffen Klassert err = dev->xfrmdev_ops->xdo_dev_state_add(x); 242d77e38e6SSteffen Klassert if (err) { 2434a132095SShannon Nelson xso->num_exthdrs = 0; 2444a132095SShannon Nelson xso->flags = 0; 245aa5dd6faSAviad Yehezkel xso->dev = NULL; 246d77e38e6SSteffen Klassert dev_put(dev); 2474a132095SShannon Nelson 2484a132095SShannon Nelson if (err != -EOPNOTSUPP) 249d77e38e6SSteffen Klassert return err; 250d77e38e6SSteffen Klassert } 251d77e38e6SSteffen Klassert 252d77e38e6SSteffen Klassert return 0; 253d77e38e6SSteffen Klassert } 254d77e38e6SSteffen Klassert EXPORT_SYMBOL_GPL(xfrm_dev_state_add); 255d77e38e6SSteffen Klassert 256d77e38e6SSteffen Klassert bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 257d77e38e6SSteffen Klassert { 258d77e38e6SSteffen Klassert int mtu; 259d77e38e6SSteffen Klassert struct dst_entry *dst = skb_dst(skb); 260d77e38e6SSteffen Klassert struct xfrm_dst *xdst = (struct xfrm_dst *)dst; 261d77e38e6SSteffen Klassert struct net_device *dev = x->xso.dev; 262d77e38e6SSteffen Klassert 263d77e38e6SSteffen Klassert if (!x->type_offload || x->encap) 264d77e38e6SSteffen Klassert return false; 265d77e38e6SSteffen Klassert 266fcb662deSShannon Nelson if ((!dev || (dev == xfrm_dst_path(dst)->dev)) && 267c7b37c76SFlorian Westphal (!xdst->child->xfrm)) { 268c7b37c76SFlorian Westphal mtu = xfrm_state_mtu(x, xdst->child_mtu_cached); 269d77e38e6SSteffen Klassert if (skb->len <= mtu) 270d77e38e6SSteffen Klassert goto ok; 271d77e38e6SSteffen Klassert 272779b7931SDaniel Axtens if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) 273d77e38e6SSteffen Klassert goto ok; 274d77e38e6SSteffen Klassert } 275d77e38e6SSteffen Klassert 276d77e38e6SSteffen Klassert return false; 277d77e38e6SSteffen Klassert 278d77e38e6SSteffen Klassert ok: 279d77e38e6SSteffen Klassert if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok) 280d77e38e6SSteffen Klassert return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x); 281d77e38e6SSteffen Klassert 282d77e38e6SSteffen Klassert return true; 283d77e38e6SSteffen Klassert } 284d77e38e6SSteffen Klassert EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok); 285f53c7239SSteffen Klassert 286f53c7239SSteffen Klassert void xfrm_dev_resume(struct sk_buff *skb) 287f53c7239SSteffen Klassert { 288f53c7239SSteffen Klassert struct net_device *dev = skb->dev; 289f53c7239SSteffen Klassert int ret = NETDEV_TX_BUSY; 290f53c7239SSteffen Klassert struct netdev_queue *txq; 291f53c7239SSteffen Klassert struct softnet_data *sd; 292f53c7239SSteffen Klassert unsigned long flags; 293f53c7239SSteffen Klassert 294f53c7239SSteffen Klassert rcu_read_lock(); 2954bd97d51SPaolo Abeni txq = netdev_core_pick_tx(dev, skb, NULL); 296f53c7239SSteffen Klassert 297f53c7239SSteffen Klassert HARD_TX_LOCK(dev, txq, smp_processor_id()); 298f53c7239SSteffen Klassert if (!netif_xmit_frozen_or_stopped(txq)) 299f53c7239SSteffen Klassert skb = dev_hard_start_xmit(skb, dev, txq, &ret); 300f53c7239SSteffen Klassert HARD_TX_UNLOCK(dev, txq); 301f53c7239SSteffen Klassert 302f53c7239SSteffen Klassert if (!dev_xmit_complete(ret)) { 303f53c7239SSteffen Klassert local_irq_save(flags); 304f53c7239SSteffen Klassert sd = this_cpu_ptr(&softnet_data); 305f53c7239SSteffen Klassert skb_queue_tail(&sd->xfrm_backlog, skb); 306f53c7239SSteffen Klassert raise_softirq_irqoff(NET_TX_SOFTIRQ); 307f53c7239SSteffen Klassert local_irq_restore(flags); 308f53c7239SSteffen Klassert } 309f53c7239SSteffen Klassert rcu_read_unlock(); 310f53c7239SSteffen Klassert } 311f53c7239SSteffen Klassert EXPORT_SYMBOL_GPL(xfrm_dev_resume); 312f53c7239SSteffen Klassert 313f53c7239SSteffen Klassert void xfrm_dev_backlog(struct softnet_data *sd) 314f53c7239SSteffen Klassert { 315f53c7239SSteffen Klassert struct sk_buff_head *xfrm_backlog = &sd->xfrm_backlog; 316f53c7239SSteffen Klassert struct sk_buff_head list; 317f53c7239SSteffen Klassert struct sk_buff *skb; 318f53c7239SSteffen Klassert 319f53c7239SSteffen Klassert if (skb_queue_empty(xfrm_backlog)) 320f53c7239SSteffen Klassert return; 321f53c7239SSteffen Klassert 322f53c7239SSteffen Klassert __skb_queue_head_init(&list); 323f53c7239SSteffen Klassert 324f53c7239SSteffen Klassert spin_lock(&xfrm_backlog->lock); 325f53c7239SSteffen Klassert skb_queue_splice_init(xfrm_backlog, &list); 326f53c7239SSteffen Klassert spin_unlock(&xfrm_backlog->lock); 327f53c7239SSteffen Klassert 328f53c7239SSteffen Klassert while (!skb_queue_empty(&list)) { 329f53c7239SSteffen Klassert skb = __skb_dequeue(&list); 330f53c7239SSteffen Klassert xfrm_dev_resume(skb); 331f53c7239SSteffen Klassert } 332f53c7239SSteffen Klassert 333f53c7239SSteffen Klassert } 334b81f884aSHangbin Liu #endif 335d77e38e6SSteffen Klassert 33692a23206SShannon Nelson static int xfrm_api_check(struct net_device *dev) 337d77e38e6SSteffen Klassert { 33892a23206SShannon Nelson #ifdef CONFIG_XFRM_OFFLOAD 339d77e38e6SSteffen Klassert if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) && 340d77e38e6SSteffen Klassert !(dev->features & NETIF_F_HW_ESP)) 341d77e38e6SSteffen Klassert return NOTIFY_BAD; 342d77e38e6SSteffen Klassert 34392a23206SShannon Nelson if ((dev->features & NETIF_F_HW_ESP) && 34492a23206SShannon Nelson (!(dev->xfrmdev_ops && 34592a23206SShannon Nelson dev->xfrmdev_ops->xdo_dev_state_add && 34692a23206SShannon Nelson dev->xfrmdev_ops->xdo_dev_state_delete))) 34792a23206SShannon Nelson return NOTIFY_BAD; 34892a23206SShannon Nelson #else 34992a23206SShannon Nelson if (dev->features & (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM)) 35092a23206SShannon Nelson return NOTIFY_BAD; 35192a23206SShannon Nelson #endif 35292a23206SShannon Nelson 353d77e38e6SSteffen Klassert return NOTIFY_DONE; 354d77e38e6SSteffen Klassert } 355d77e38e6SSteffen Klassert 35692a23206SShannon Nelson static int xfrm_dev_register(struct net_device *dev) 35792a23206SShannon Nelson { 35892a23206SShannon Nelson return xfrm_api_check(dev); 35992a23206SShannon Nelson } 36092a23206SShannon Nelson 361d77e38e6SSteffen Klassert static int xfrm_dev_feat_change(struct net_device *dev) 362d77e38e6SSteffen Klassert { 36392a23206SShannon Nelson return xfrm_api_check(dev); 364d77e38e6SSteffen Klassert } 365d77e38e6SSteffen Klassert 366d77e38e6SSteffen Klassert static int xfrm_dev_down(struct net_device *dev) 367d77e38e6SSteffen Klassert { 3682c1497bbSIlan Tayari if (dev->features & NETIF_F_HW_ESP) 369d77e38e6SSteffen Klassert xfrm_dev_state_flush(dev_net(dev), dev, true); 370d77e38e6SSteffen Klassert 371d77e38e6SSteffen Klassert return NOTIFY_DONE; 372d77e38e6SSteffen Klassert } 373d77e38e6SSteffen Klassert 37421f42cc9SSteffen Klassert static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) 37521f42cc9SSteffen Klassert { 37621f42cc9SSteffen Klassert struct net_device *dev = netdev_notifier_info_to_dev(ptr); 37721f42cc9SSteffen Klassert 37821f42cc9SSteffen Klassert switch (event) { 379d77e38e6SSteffen Klassert case NETDEV_REGISTER: 380d77e38e6SSteffen Klassert return xfrm_dev_register(dev); 381d77e38e6SSteffen Klassert 382d77e38e6SSteffen Klassert case NETDEV_FEAT_CHANGE: 383d77e38e6SSteffen Klassert return xfrm_dev_feat_change(dev); 384d77e38e6SSteffen Klassert 38521f42cc9SSteffen Klassert case NETDEV_DOWN: 38603891f82SRaed Salem case NETDEV_UNREGISTER: 387d77e38e6SSteffen Klassert return xfrm_dev_down(dev); 38821f42cc9SSteffen Klassert } 38921f42cc9SSteffen Klassert return NOTIFY_DONE; 39021f42cc9SSteffen Klassert } 39121f42cc9SSteffen Klassert 39221f42cc9SSteffen Klassert static struct notifier_block xfrm_dev_notifier = { 39321f42cc9SSteffen Klassert .notifier_call = xfrm_dev_event, 39421f42cc9SSteffen Klassert }; 39521f42cc9SSteffen Klassert 396e9a441b6SKirill Tkhai void __init xfrm_dev_init(void) 39721f42cc9SSteffen Klassert { 39821f42cc9SSteffen Klassert register_netdevice_notifier(&xfrm_dev_notifier); 39921f42cc9SSteffen Klassert } 400