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 4930849175SXin Long static void __xfrm_mode_beet_prep(struct xfrm_state *x, struct sk_buff *skb, 5030849175SXin Long unsigned int hsize) 5130849175SXin Long { 5230849175SXin Long struct xfrm_offload *xo = xfrm_offload(skb); 5330849175SXin Long int phlen = 0; 5430849175SXin Long 5530849175SXin Long if (xo->flags & XFRM_GSO_SEGMENT) 5630849175SXin Long skb->transport_header = skb->network_header + hsize; 5730849175SXin Long 5830849175SXin Long skb_reset_mac_len(skb); 5930849175SXin Long if (x->sel.family != AF_INET6) { 6030849175SXin Long phlen = IPV4_BEET_PHMAXLEN; 6130849175SXin Long if (x->outer_mode.family == AF_INET6) 6230849175SXin Long phlen += sizeof(struct ipv6hdr) - sizeof(struct iphdr); 6330849175SXin Long } 6430849175SXin Long 6530849175SXin Long pskb_pull(skb, skb->mac_len + hsize + (x->props.header_len - phlen)); 6630849175SXin Long } 6730849175SXin Long 68303c5fabSFlorian Westphal /* Adjust pointers into the packet when IPsec is done at layer2 */ 69303c5fabSFlorian Westphal static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb) 70303c5fabSFlorian Westphal { 71c9500d7bSFlorian Westphal switch (x->outer_mode.encap) { 72303c5fabSFlorian Westphal case XFRM_MODE_TUNNEL: 73c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET) 74303c5fabSFlorian Westphal return __xfrm_mode_tunnel_prep(x, skb, 75303c5fabSFlorian Westphal sizeof(struct iphdr)); 76c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET6) 77303c5fabSFlorian Westphal return __xfrm_mode_tunnel_prep(x, skb, 78303c5fabSFlorian Westphal sizeof(struct ipv6hdr)); 79303c5fabSFlorian Westphal break; 80303c5fabSFlorian Westphal case XFRM_MODE_TRANSPORT: 81c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET) 82303c5fabSFlorian Westphal return __xfrm_transport_prep(x, skb, 83303c5fabSFlorian Westphal sizeof(struct iphdr)); 84c9500d7bSFlorian Westphal if (x->outer_mode.family == AF_INET6) 85303c5fabSFlorian Westphal return __xfrm_transport_prep(x, skb, 86303c5fabSFlorian Westphal sizeof(struct ipv6hdr)); 87303c5fabSFlorian Westphal break; 8830849175SXin Long case XFRM_MODE_BEET: 8930849175SXin Long if (x->outer_mode.family == AF_INET) 9030849175SXin Long return __xfrm_mode_beet_prep(x, skb, 9130849175SXin Long sizeof(struct iphdr)); 9230849175SXin Long if (x->outer_mode.family == AF_INET6) 9330849175SXin Long return __xfrm_mode_beet_prep(x, skb, 9430849175SXin Long sizeof(struct ipv6hdr)); 9530849175SXin Long break; 96303c5fabSFlorian Westphal case XFRM_MODE_ROUTEOPTIMIZATION: 97303c5fabSFlorian Westphal case XFRM_MODE_IN_TRIGGER: 98303c5fabSFlorian Westphal break; 99303c5fabSFlorian Westphal } 100303c5fabSFlorian Westphal } 101303c5fabSFlorian Westphal 102f53c7239SSteffen Klassert struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 103f6e27114SSteffen Klassert { 104f6e27114SSteffen Klassert int err; 105f53c7239SSteffen Klassert unsigned long flags; 106f6e27114SSteffen Klassert struct xfrm_state *x; 107c3b18e0dSJason A. Donenfeld struct sk_buff *skb2, *nskb; 108f53c7239SSteffen Klassert struct softnet_data *sd; 1093dca3f38SSteffen Klassert netdev_features_t esp_features = features; 110f6e27114SSteffen Klassert struct xfrm_offload *xo = xfrm_offload(skb); 1112294be0fSFlorian Westphal struct sec_path *sp; 112f6e27114SSteffen Klassert 1133dca3f38SSteffen Klassert if (!xo) 1143dca3f38SSteffen Klassert return skb; 115f6e27114SSteffen Klassert 1163dca3f38SSteffen Klassert if (!(features & NETIF_F_HW_ESP)) 1173dca3f38SSteffen Klassert esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK); 1183dca3f38SSteffen Klassert 1192294be0fSFlorian Westphal sp = skb_sec_path(skb); 1202294be0fSFlorian Westphal x = sp->xvec[sp->len - 1]; 121f6e27114SSteffen Klassert if (xo->flags & XFRM_GRO || x->xso.flags & XFRM_OFFLOAD_INBOUND) 1223dca3f38SSteffen Klassert return skb; 123f6e27114SSteffen Klassert 124f53c7239SSteffen Klassert local_irq_save(flags); 125f53c7239SSteffen Klassert sd = this_cpu_ptr(&softnet_data); 126f53c7239SSteffen Klassert err = !skb_queue_empty(&sd->xfrm_backlog); 127f53c7239SSteffen Klassert local_irq_restore(flags); 128f53c7239SSteffen Klassert 129f53c7239SSteffen Klassert if (err) { 130f53c7239SSteffen Klassert *again = true; 131f53c7239SSteffen Klassert return skb; 132f53c7239SSteffen Klassert } 133f53c7239SSteffen Klassert 1343dca3f38SSteffen Klassert if (skb_is_gso(skb)) { 1353dca3f38SSteffen Klassert struct net_device *dev = skb->dev; 1363dca3f38SSteffen Klassert 137fcb662deSShannon Nelson if (unlikely(x->xso.dev != dev)) { 1383dca3f38SSteffen Klassert struct sk_buff *segs; 1393dca3f38SSteffen Klassert 1403dca3f38SSteffen Klassert /* Packet got rerouted, fixup features and segment it. */ 1413dca3f38SSteffen Klassert esp_features = esp_features & ~(NETIF_F_HW_ESP 1423dca3f38SSteffen Klassert | NETIF_F_GSO_ESP); 1433dca3f38SSteffen Klassert 1443dca3f38SSteffen Klassert segs = skb_gso_segment(skb, esp_features); 1453dca3f38SSteffen Klassert if (IS_ERR(segs)) { 1463dca3f38SSteffen Klassert kfree_skb(skb); 147f53c7239SSteffen Klassert atomic_long_inc(&dev->tx_dropped); 1483dca3f38SSteffen Klassert return NULL; 1493dca3f38SSteffen Klassert } else { 1503dca3f38SSteffen Klassert consume_skb(skb); 1513dca3f38SSteffen Klassert skb = segs; 1523dca3f38SSteffen Klassert } 1533dca3f38SSteffen Klassert } 1543dca3f38SSteffen Klassert } 1553dca3f38SSteffen Klassert 1563dca3f38SSteffen Klassert if (!skb->next) { 15765fd2c2aSBoris Pismenny esp_features |= skb->dev->gso_partial_features; 158303c5fabSFlorian Westphal xfrm_outer_mode_prep(x, skb); 159f6e27114SSteffen Klassert 160f53c7239SSteffen Klassert xo->flags |= XFRM_DEV_RESUME; 161f53c7239SSteffen Klassert 1623dca3f38SSteffen Klassert err = x->type_offload->xmit(x, skb, esp_features); 163f6e27114SSteffen Klassert if (err) { 164f53c7239SSteffen Klassert if (err == -EINPROGRESS) 165f53c7239SSteffen Klassert return NULL; 166f53c7239SSteffen Klassert 167f6e27114SSteffen Klassert XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); 1683dca3f38SSteffen Klassert kfree_skb(skb); 1693dca3f38SSteffen Klassert return NULL; 170f6e27114SSteffen Klassert } 171f6e27114SSteffen Klassert 172f6e27114SSteffen Klassert skb_push(skb, skb->data - skb_mac_header(skb)); 1733dca3f38SSteffen Klassert 1743dca3f38SSteffen Klassert return skb; 175f6e27114SSteffen Klassert } 176f6e27114SSteffen Klassert 177c3b18e0dSJason A. Donenfeld skb_list_walk_safe(skb, skb2, nskb) { 17865fd2c2aSBoris Pismenny esp_features |= skb->dev->gso_partial_features; 179a8305bffSDavid S. Miller skb_mark_not_on_list(skb2); 1803dca3f38SSteffen Klassert 1813dca3f38SSteffen Klassert xo = xfrm_offload(skb2); 182f53c7239SSteffen Klassert xo->flags |= XFRM_DEV_RESUME; 1833dca3f38SSteffen Klassert 184303c5fabSFlorian Westphal xfrm_outer_mode_prep(x, skb2); 1853dca3f38SSteffen Klassert 1863dca3f38SSteffen Klassert err = x->type_offload->xmit(x, skb2, esp_features); 187f53c7239SSteffen Klassert if (!err) { 188f53c7239SSteffen Klassert skb2->next = nskb; 189f53c7239SSteffen Klassert } else if (err != -EINPROGRESS) { 1903dca3f38SSteffen Klassert XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); 1913dca3f38SSteffen Klassert skb2->next = nskb; 1923dca3f38SSteffen Klassert kfree_skb_list(skb2); 1933dca3f38SSteffen Klassert return NULL; 194f53c7239SSteffen Klassert } else { 195f53c7239SSteffen Klassert if (skb == skb2) 196f53c7239SSteffen Klassert skb = nskb; 1973dca3f38SSteffen Klassert 198f53c7239SSteffen Klassert if (!skb) 199f53c7239SSteffen Klassert return NULL; 200f53c7239SSteffen Klassert 201c3b18e0dSJason A. Donenfeld continue; 202f53c7239SSteffen Klassert } 2033dca3f38SSteffen Klassert 2043dca3f38SSteffen Klassert skb_push(skb2, skb2->data - skb_mac_header(skb2)); 205c3b18e0dSJason A. Donenfeld } 2063dca3f38SSteffen Klassert 2073dca3f38SSteffen Klassert return skb; 208f6e27114SSteffen Klassert } 209f6e27114SSteffen Klassert EXPORT_SYMBOL_GPL(validate_xmit_xfrm); 210f6e27114SSteffen Klassert 211d77e38e6SSteffen Klassert int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 212d77e38e6SSteffen Klassert struct xfrm_user_offload *xuo) 213d77e38e6SSteffen Klassert { 214d77e38e6SSteffen Klassert int err; 215d77e38e6SSteffen Klassert struct dst_entry *dst; 216d77e38e6SSteffen Klassert struct net_device *dev; 217d77e38e6SSteffen Klassert struct xfrm_state_offload *xso = &x->xso; 218d77e38e6SSteffen Klassert xfrm_address_t *saddr; 219d77e38e6SSteffen Klassert xfrm_address_t *daddr; 220d77e38e6SSteffen Klassert 221d77e38e6SSteffen Klassert if (!x->type_offload) 222ffdb5211SIlan Tayari return -EINVAL; 223d77e38e6SSteffen Klassert 22450bd870aSYossef Efraim /* We don't yet support UDP encapsulation and TFC padding. */ 22550bd870aSYossef Efraim if (x->encap || x->tfcpad) 22643024b9cSYossef Efraim return -EINVAL; 227d77e38e6SSteffen Klassert 228d77e38e6SSteffen Klassert dev = dev_get_by_index(net, xuo->ifindex); 229d77e38e6SSteffen Klassert if (!dev) { 230d77e38e6SSteffen Klassert if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) { 231d77e38e6SSteffen Klassert saddr = &x->props.saddr; 232d77e38e6SSteffen Klassert daddr = &x->id.daddr; 233d77e38e6SSteffen Klassert } else { 234d77e38e6SSteffen Klassert saddr = &x->id.daddr; 235d77e38e6SSteffen Klassert daddr = &x->props.saddr; 236d77e38e6SSteffen Klassert } 237d77e38e6SSteffen Klassert 238077fbac4SLorenzo Colitti dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr, 2399b42c1f1SSteffen Klassert x->props.family, 2409b42c1f1SSteffen Klassert xfrm_smark_get(0, x)); 241d77e38e6SSteffen Klassert if (IS_ERR(dst)) 242d77e38e6SSteffen Klassert return 0; 243d77e38e6SSteffen Klassert 244d77e38e6SSteffen Klassert dev = dst->dev; 245d77e38e6SSteffen Klassert 246d77e38e6SSteffen Klassert dev_hold(dev); 247d77e38e6SSteffen Klassert dst_release(dst); 248d77e38e6SSteffen Klassert } 249d77e38e6SSteffen Klassert 250d77e38e6SSteffen Klassert if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_state_add) { 25167a63387SSteffen Klassert xso->dev = NULL; 252d77e38e6SSteffen Klassert dev_put(dev); 253d77e38e6SSteffen Klassert return 0; 254d77e38e6SSteffen Klassert } 255d77e38e6SSteffen Klassert 25650bd870aSYossef Efraim if (x->props.flags & XFRM_STATE_ESN && 25750bd870aSYossef Efraim !dev->xfrmdev_ops->xdo_dev_state_advance_esn) { 25850bd870aSYossef Efraim xso->dev = NULL; 25950bd870aSYossef Efraim dev_put(dev); 26050bd870aSYossef Efraim return -EINVAL; 26150bd870aSYossef Efraim } 26250bd870aSYossef Efraim 263d77e38e6SSteffen Klassert xso->dev = dev; 264d77e38e6SSteffen Klassert xso->num_exthdrs = 1; 265d77e38e6SSteffen Klassert xso->flags = xuo->flags; 266d77e38e6SSteffen Klassert 267d77e38e6SSteffen Klassert err = dev->xfrmdev_ops->xdo_dev_state_add(x); 268d77e38e6SSteffen Klassert if (err) { 2694a132095SShannon Nelson xso->num_exthdrs = 0; 2704a132095SShannon Nelson xso->flags = 0; 271aa5dd6faSAviad Yehezkel xso->dev = NULL; 272d77e38e6SSteffen Klassert dev_put(dev); 2734a132095SShannon Nelson 2744a132095SShannon Nelson if (err != -EOPNOTSUPP) 275d77e38e6SSteffen Klassert return err; 276d77e38e6SSteffen Klassert } 277d77e38e6SSteffen Klassert 278d77e38e6SSteffen Klassert return 0; 279d77e38e6SSteffen Klassert } 280d77e38e6SSteffen Klassert EXPORT_SYMBOL_GPL(xfrm_dev_state_add); 281d77e38e6SSteffen Klassert 282d77e38e6SSteffen Klassert bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 283d77e38e6SSteffen Klassert { 284d77e38e6SSteffen Klassert int mtu; 285d77e38e6SSteffen Klassert struct dst_entry *dst = skb_dst(skb); 286d77e38e6SSteffen Klassert struct xfrm_dst *xdst = (struct xfrm_dst *)dst; 287d77e38e6SSteffen Klassert struct net_device *dev = x->xso.dev; 288d77e38e6SSteffen Klassert 289d77e38e6SSteffen Klassert if (!x->type_offload || x->encap) 290d77e38e6SSteffen Klassert return false; 291d77e38e6SSteffen Klassert 292fcb662deSShannon Nelson if ((!dev || (dev == xfrm_dst_path(dst)->dev)) && 293c7b37c76SFlorian Westphal (!xdst->child->xfrm)) { 294c7b37c76SFlorian Westphal mtu = xfrm_state_mtu(x, xdst->child_mtu_cached); 295d77e38e6SSteffen Klassert if (skb->len <= mtu) 296d77e38e6SSteffen Klassert goto ok; 297d77e38e6SSteffen Klassert 298779b7931SDaniel Axtens if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) 299d77e38e6SSteffen Klassert goto ok; 300d77e38e6SSteffen Klassert } 301d77e38e6SSteffen Klassert 302d77e38e6SSteffen Klassert return false; 303d77e38e6SSteffen Klassert 304d77e38e6SSteffen Klassert ok: 305d77e38e6SSteffen Klassert if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok) 306d77e38e6SSteffen Klassert return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x); 307d77e38e6SSteffen Klassert 308d77e38e6SSteffen Klassert return true; 309d77e38e6SSteffen Klassert } 310d77e38e6SSteffen Klassert EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok); 311f53c7239SSteffen Klassert 312f53c7239SSteffen Klassert void xfrm_dev_resume(struct sk_buff *skb) 313f53c7239SSteffen Klassert { 314f53c7239SSteffen Klassert struct net_device *dev = skb->dev; 315f53c7239SSteffen Klassert int ret = NETDEV_TX_BUSY; 316f53c7239SSteffen Klassert struct netdev_queue *txq; 317f53c7239SSteffen Klassert struct softnet_data *sd; 318f53c7239SSteffen Klassert unsigned long flags; 319f53c7239SSteffen Klassert 320f53c7239SSteffen Klassert rcu_read_lock(); 3214bd97d51SPaolo Abeni txq = netdev_core_pick_tx(dev, skb, NULL); 322f53c7239SSteffen Klassert 323f53c7239SSteffen Klassert HARD_TX_LOCK(dev, txq, smp_processor_id()); 324f53c7239SSteffen Klassert if (!netif_xmit_frozen_or_stopped(txq)) 325f53c7239SSteffen Klassert skb = dev_hard_start_xmit(skb, dev, txq, &ret); 326f53c7239SSteffen Klassert HARD_TX_UNLOCK(dev, txq); 327f53c7239SSteffen Klassert 328f53c7239SSteffen Klassert if (!dev_xmit_complete(ret)) { 329f53c7239SSteffen Klassert local_irq_save(flags); 330f53c7239SSteffen Klassert sd = this_cpu_ptr(&softnet_data); 331f53c7239SSteffen Klassert skb_queue_tail(&sd->xfrm_backlog, skb); 332f53c7239SSteffen Klassert raise_softirq_irqoff(NET_TX_SOFTIRQ); 333f53c7239SSteffen Klassert local_irq_restore(flags); 334f53c7239SSteffen Klassert } 335f53c7239SSteffen Klassert rcu_read_unlock(); 336f53c7239SSteffen Klassert } 337f53c7239SSteffen Klassert EXPORT_SYMBOL_GPL(xfrm_dev_resume); 338f53c7239SSteffen Klassert 339f53c7239SSteffen Klassert void xfrm_dev_backlog(struct softnet_data *sd) 340f53c7239SSteffen Klassert { 341f53c7239SSteffen Klassert struct sk_buff_head *xfrm_backlog = &sd->xfrm_backlog; 342f53c7239SSteffen Klassert struct sk_buff_head list; 343f53c7239SSteffen Klassert struct sk_buff *skb; 344f53c7239SSteffen Klassert 345f53c7239SSteffen Klassert if (skb_queue_empty(xfrm_backlog)) 346f53c7239SSteffen Klassert return; 347f53c7239SSteffen Klassert 348f53c7239SSteffen Klassert __skb_queue_head_init(&list); 349f53c7239SSteffen Klassert 350f53c7239SSteffen Klassert spin_lock(&xfrm_backlog->lock); 351f53c7239SSteffen Klassert skb_queue_splice_init(xfrm_backlog, &list); 352f53c7239SSteffen Klassert spin_unlock(&xfrm_backlog->lock); 353f53c7239SSteffen Klassert 354f53c7239SSteffen Klassert while (!skb_queue_empty(&list)) { 355f53c7239SSteffen Klassert skb = __skb_dequeue(&list); 356f53c7239SSteffen Klassert xfrm_dev_resume(skb); 357f53c7239SSteffen Klassert } 358f53c7239SSteffen Klassert 359f53c7239SSteffen Klassert } 360b81f884aSHangbin Liu #endif 361d77e38e6SSteffen Klassert 36292a23206SShannon Nelson static int xfrm_api_check(struct net_device *dev) 363d77e38e6SSteffen Klassert { 36492a23206SShannon Nelson #ifdef CONFIG_XFRM_OFFLOAD 365d77e38e6SSteffen Klassert if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) && 366d77e38e6SSteffen Klassert !(dev->features & NETIF_F_HW_ESP)) 367d77e38e6SSteffen Klassert return NOTIFY_BAD; 368d77e38e6SSteffen Klassert 36992a23206SShannon Nelson if ((dev->features & NETIF_F_HW_ESP) && 37092a23206SShannon Nelson (!(dev->xfrmdev_ops && 37192a23206SShannon Nelson dev->xfrmdev_ops->xdo_dev_state_add && 37292a23206SShannon Nelson dev->xfrmdev_ops->xdo_dev_state_delete))) 37392a23206SShannon Nelson return NOTIFY_BAD; 37492a23206SShannon Nelson #else 37592a23206SShannon Nelson if (dev->features & (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM)) 37692a23206SShannon Nelson return NOTIFY_BAD; 37792a23206SShannon Nelson #endif 37892a23206SShannon Nelson 379d77e38e6SSteffen Klassert return NOTIFY_DONE; 380d77e38e6SSteffen Klassert } 381d77e38e6SSteffen Klassert 38292a23206SShannon Nelson static int xfrm_dev_register(struct net_device *dev) 38392a23206SShannon Nelson { 38492a23206SShannon Nelson return xfrm_api_check(dev); 38592a23206SShannon Nelson } 38692a23206SShannon Nelson 387d77e38e6SSteffen Klassert static int xfrm_dev_feat_change(struct net_device *dev) 388d77e38e6SSteffen Klassert { 38992a23206SShannon Nelson return xfrm_api_check(dev); 390d77e38e6SSteffen Klassert } 391d77e38e6SSteffen Klassert 392d77e38e6SSteffen Klassert static int xfrm_dev_down(struct net_device *dev) 393d77e38e6SSteffen Klassert { 3942c1497bbSIlan Tayari if (dev->features & NETIF_F_HW_ESP) 395d77e38e6SSteffen Klassert xfrm_dev_state_flush(dev_net(dev), dev, true); 396d77e38e6SSteffen Klassert 397d77e38e6SSteffen Klassert return NOTIFY_DONE; 398d77e38e6SSteffen Klassert } 399d77e38e6SSteffen Klassert 40021f42cc9SSteffen Klassert static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) 40121f42cc9SSteffen Klassert { 40221f42cc9SSteffen Klassert struct net_device *dev = netdev_notifier_info_to_dev(ptr); 40321f42cc9SSteffen Klassert 40421f42cc9SSteffen Klassert switch (event) { 405d77e38e6SSteffen Klassert case NETDEV_REGISTER: 406d77e38e6SSteffen Klassert return xfrm_dev_register(dev); 407d77e38e6SSteffen Klassert 408d77e38e6SSteffen Klassert case NETDEV_FEAT_CHANGE: 409d77e38e6SSteffen Klassert return xfrm_dev_feat_change(dev); 410d77e38e6SSteffen Klassert 41121f42cc9SSteffen Klassert case NETDEV_DOWN: 412d77e38e6SSteffen Klassert return xfrm_dev_down(dev); 41321f42cc9SSteffen Klassert } 41421f42cc9SSteffen Klassert return NOTIFY_DONE; 41521f42cc9SSteffen Klassert } 41621f42cc9SSteffen Klassert 41721f42cc9SSteffen Klassert static struct notifier_block xfrm_dev_notifier = { 41821f42cc9SSteffen Klassert .notifier_call = xfrm_dev_event, 41921f42cc9SSteffen Klassert }; 42021f42cc9SSteffen Klassert 421e9a441b6SKirill Tkhai void __init xfrm_dev_init(void) 42221f42cc9SSteffen Klassert { 42321f42cc9SSteffen Klassert register_netdevice_notifier(&xfrm_dev_notifier); 42421f42cc9SSteffen Klassert } 425