Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * XFRM virtual interface |
| 4 | * |
| 5 | * Copyright (C) 2018 secunet Security Networks AG |
| 6 | * |
| 7 | * Author: |
| 8 | * Steffen Klassert <steffen.klassert@secunet.com> |
| 9 | */ |
| 10 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/capability.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/sockios.h> |
| 16 | #include <linux/icmp.h> |
| 17 | #include <linux/if.h> |
| 18 | #include <linux/in.h> |
| 19 | #include <linux/ip.h> |
| 20 | #include <linux/net.h> |
| 21 | #include <linux/in6.h> |
| 22 | #include <linux/netdevice.h> |
| 23 | #include <linux/if_link.h> |
| 24 | #include <linux/if_arp.h> |
| 25 | #include <linux/icmpv6.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/route.h> |
| 28 | #include <linux/rtnetlink.h> |
| 29 | #include <linux/netfilter_ipv6.h> |
| 30 | #include <linux/slab.h> |
| 31 | #include <linux/hash.h> |
| 32 | |
| 33 | #include <linux/uaccess.h> |
| 34 | #include <linux/atomic.h> |
| 35 | |
| 36 | #include <net/icmp.h> |
| 37 | #include <net/ip.h> |
| 38 | #include <net/ipv6.h> |
| 39 | #include <net/ip6_route.h> |
| 40 | #include <net/addrconf.h> |
| 41 | #include <net/xfrm.h> |
| 42 | #include <net/net_namespace.h> |
| 43 | #include <net/netns/generic.h> |
| 44 | #include <linux/etherdevice.h> |
| 45 | |
| 46 | static int xfrmi_dev_init(struct net_device *dev); |
| 47 | static void xfrmi_dev_setup(struct net_device *dev); |
| 48 | static struct rtnl_link_ops xfrmi_link_ops __read_mostly; |
| 49 | static unsigned int xfrmi_net_id __read_mostly; |
| 50 | |
| 51 | struct xfrmi_net { |
| 52 | /* lists for storing interfaces in use */ |
| 53 | struct xfrm_if __rcu *xfrmi[1]; |
| 54 | }; |
| 55 | |
| 56 | #define for_each_xfrmi_rcu(start, xi) \ |
| 57 | for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next)) |
| 58 | |
| 59 | static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x) |
| 60 | { |
| 61 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| 62 | struct xfrm_if *xi; |
| 63 | |
| 64 | for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) { |
| 65 | if (x->if_id == xi->p.if_id && |
| 66 | (xi->dev->flags & IFF_UP)) |
| 67 | return xi; |
| 68 | } |
| 69 | |
| 70 | return NULL; |
| 71 | } |
| 72 | |
Martin Willi | 025c65e | 2019-03-26 13:20:43 +0100 | [diff] [blame] | 73 | static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb, |
| 74 | unsigned short family) |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 75 | { |
| 76 | struct xfrmi_net *xfrmn; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 77 | struct xfrm_if *xi; |
Martin Willi | 025c65e | 2019-03-26 13:20:43 +0100 | [diff] [blame] | 78 | int ifindex = 0; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 79 | |
Tobias Brunner | 660899d | 2019-02-18 10:49:39 +0100 | [diff] [blame] | 80 | if (!secpath_exists(skb) || !skb->dev) |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 81 | return NULL; |
| 82 | |
Martin Willi | 025c65e | 2019-03-26 13:20:43 +0100 | [diff] [blame] | 83 | switch (family) { |
| 84 | case AF_INET6: |
| 85 | ifindex = inet6_sdif(skb); |
| 86 | break; |
| 87 | case AF_INET: |
| 88 | ifindex = inet_sdif(skb); |
| 89 | break; |
| 90 | } |
| 91 | if (!ifindex) |
| 92 | ifindex = skb->dev->ifindex; |
| 93 | |
Tobias Brunner | 660899d | 2019-02-18 10:49:39 +0100 | [diff] [blame] | 94 | xfrmn = net_generic(xs_net(xfrm_input_state(skb)), xfrmi_net_id); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 95 | |
| 96 | for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) { |
| 97 | if (ifindex == xi->dev->ifindex && |
| 98 | (xi->dev->flags & IFF_UP)) |
| 99 | return xi; |
| 100 | } |
| 101 | |
| 102 | return NULL; |
| 103 | } |
| 104 | |
| 105 | static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi) |
| 106 | { |
| 107 | struct xfrm_if __rcu **xip = &xfrmn->xfrmi[0]; |
| 108 | |
| 109 | rcu_assign_pointer(xi->next , rtnl_dereference(*xip)); |
| 110 | rcu_assign_pointer(*xip, xi); |
| 111 | } |
| 112 | |
| 113 | static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi) |
| 114 | { |
| 115 | struct xfrm_if __rcu **xip; |
| 116 | struct xfrm_if *iter; |
| 117 | |
| 118 | for (xip = &xfrmn->xfrmi[0]; |
| 119 | (iter = rtnl_dereference(*xip)) != NULL; |
| 120 | xip = &iter->next) { |
| 121 | if (xi == iter) { |
| 122 | rcu_assign_pointer(*xip, xi->next); |
| 123 | break; |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | static void xfrmi_dev_free(struct net_device *dev) |
| 129 | { |
Li RongQing | 4da4025 | 2018-09-30 15:06:06 +0800 | [diff] [blame] | 130 | struct xfrm_if *xi = netdev_priv(dev); |
| 131 | |
| 132 | gro_cells_destroy(&xi->gro_cells); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 133 | free_percpu(dev->tstats); |
| 134 | } |
| 135 | |
Nicolas Dichtel | 56c5ee1 | 2019-07-02 17:51:39 +0200 | [diff] [blame] | 136 | static int xfrmi_create(struct net_device *dev) |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 137 | { |
| 138 | struct xfrm_if *xi = netdev_priv(dev); |
| 139 | struct net *net = dev_net(dev); |
| 140 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| 141 | int err; |
| 142 | |
| 143 | dev->rtnl_link_ops = &xfrmi_link_ops; |
| 144 | err = register_netdevice(dev); |
| 145 | if (err < 0) |
| 146 | goto out; |
| 147 | |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 148 | dev_hold(dev); |
| 149 | xfrmi_link(xfrmn, xi); |
| 150 | |
| 151 | return 0; |
| 152 | |
| 153 | out: |
| 154 | return err; |
| 155 | } |
| 156 | |
Nicolas Dichtel | 56c5ee1 | 2019-07-02 17:51:39 +0200 | [diff] [blame] | 157 | static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p) |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 158 | { |
| 159 | struct xfrm_if __rcu **xip; |
| 160 | struct xfrm_if *xi; |
| 161 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| 162 | |
| 163 | for (xip = &xfrmn->xfrmi[0]; |
| 164 | (xi = rtnl_dereference(*xip)) != NULL; |
Nicolas Dichtel | 56c5ee1 | 2019-07-02 17:51:39 +0200 | [diff] [blame] | 165 | xip = &xi->next) |
| 166 | if (xi->p.if_id == p->if_id) |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 167 | return xi; |
Nicolas Dichtel | 56c5ee1 | 2019-07-02 17:51:39 +0200 | [diff] [blame] | 168 | |
| 169 | return NULL; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | static void xfrmi_dev_uninit(struct net_device *dev) |
| 173 | { |
| 174 | struct xfrm_if *xi = netdev_priv(dev); |
| 175 | struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id); |
| 176 | |
| 177 | xfrmi_unlink(xfrmn, xi); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 178 | dev_put(dev); |
| 179 | } |
| 180 | |
| 181 | static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet) |
| 182 | { |
| 183 | skb->tstamp = 0; |
| 184 | skb->pkt_type = PACKET_HOST; |
| 185 | skb->skb_iif = 0; |
| 186 | skb->ignore_df = 0; |
| 187 | skb_dst_drop(skb); |
Florian Westphal | 895b5c9 | 2019-09-29 20:54:03 +0200 | [diff] [blame] | 188 | nf_reset_ct(skb); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 189 | nf_reset_trace(skb); |
| 190 | |
| 191 | if (!xnet) |
| 192 | return; |
| 193 | |
| 194 | ipvs_reset(skb); |
| 195 | secpath_reset(skb); |
| 196 | skb_orphan(skb); |
| 197 | skb->mark = 0; |
| 198 | } |
| 199 | |
| 200 | static int xfrmi_rcv_cb(struct sk_buff *skb, int err) |
| 201 | { |
Florian Westphal | 4c145dc | 2019-03-29 21:16:31 +0100 | [diff] [blame] | 202 | const struct xfrm_mode *inner_mode; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 203 | struct pcpu_sw_netstats *tstats; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 204 | struct net_device *dev; |
| 205 | struct xfrm_state *x; |
| 206 | struct xfrm_if *xi; |
| 207 | bool xnet; |
| 208 | |
Florian Westphal | 26912e3 | 2018-12-18 17:15:24 +0100 | [diff] [blame] | 209 | if (err && !secpath_exists(skb)) |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 210 | return 0; |
| 211 | |
| 212 | x = xfrm_input_state(skb); |
| 213 | |
| 214 | xi = xfrmi_lookup(xs_net(x), x); |
| 215 | if (!xi) |
| 216 | return 1; |
| 217 | |
| 218 | dev = xi->dev; |
| 219 | skb->dev = dev; |
| 220 | |
| 221 | if (err) { |
| 222 | dev->stats.rx_errors++; |
| 223 | dev->stats.rx_dropped++; |
| 224 | |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | xnet = !net_eq(xi->net, dev_net(skb->dev)); |
| 229 | |
| 230 | if (xnet) { |
Florian Westphal | c9500d7 | 2019-03-29 21:16:32 +0100 | [diff] [blame] | 231 | inner_mode = &x->inner_mode; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 232 | |
| 233 | if (x->sel.family == AF_UNSPEC) { |
| 234 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); |
| 235 | if (inner_mode == NULL) { |
| 236 | XFRM_INC_STATS(dev_net(skb->dev), |
| 237 | LINUX_MIB_XFRMINSTATEMODEERROR); |
| 238 | return -EINVAL; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, |
Florian Westphal | b45714b | 2019-03-29 21:16:23 +0100 | [diff] [blame] | 243 | inner_mode->family)) |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 244 | return -EPERM; |
| 245 | } |
| 246 | |
| 247 | xfrmi_scrub_packet(skb, xnet); |
| 248 | |
| 249 | tstats = this_cpu_ptr(dev->tstats); |
| 250 | |
| 251 | u64_stats_update_begin(&tstats->syncp); |
| 252 | tstats->rx_packets++; |
| 253 | tstats->rx_bytes += skb->len; |
| 254 | u64_stats_update_end(&tstats->syncp); |
| 255 | |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | static int |
| 260 | xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) |
| 261 | { |
| 262 | struct xfrm_if *xi = netdev_priv(dev); |
| 263 | struct net_device_stats *stats = &xi->dev->stats; |
| 264 | struct dst_entry *dst = skb_dst(skb); |
| 265 | unsigned int length = skb->len; |
| 266 | struct net_device *tdev; |
| 267 | struct xfrm_state *x; |
| 268 | int err = -1; |
| 269 | int mtu; |
| 270 | |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 271 | dst_hold(dst); |
Benedict Wong | bc56b33 | 2018-07-19 10:50:44 -0700 | [diff] [blame] | 272 | dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 273 | if (IS_ERR(dst)) { |
| 274 | err = PTR_ERR(dst); |
| 275 | dst = NULL; |
| 276 | goto tx_err_link_failure; |
| 277 | } |
| 278 | |
| 279 | x = dst->xfrm; |
| 280 | if (!x) |
| 281 | goto tx_err_link_failure; |
| 282 | |
| 283 | if (x->if_id != xi->p.if_id) |
| 284 | goto tx_err_link_failure; |
| 285 | |
| 286 | tdev = dst->dev; |
| 287 | |
| 288 | if (tdev == dev) { |
| 289 | stats->collisions++; |
| 290 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
Nicolas Dichtel | e0aaa33 | 2019-07-15 12:00:21 +0200 | [diff] [blame] | 291 | dev->name); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 292 | goto tx_err_dst_release; |
| 293 | } |
| 294 | |
| 295 | mtu = dst_mtu(dst); |
| 296 | if (!skb->ignore_df && skb->len > mtu) { |
Xu Wang | 8aaea2b | 2020-01-13 09:00:36 +0000 | [diff] [blame] | 297 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 298 | |
| 299 | if (skb->protocol == htons(ETH_P_IPV6)) { |
| 300 | if (mtu < IPV6_MIN_MTU) |
| 301 | mtu = IPV6_MIN_MTU; |
| 302 | |
| 303 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
| 304 | } else { |
| 305 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
| 306 | htonl(mtu)); |
| 307 | } |
| 308 | |
| 309 | dst_release(dst); |
| 310 | return -EMSGSIZE; |
| 311 | } |
| 312 | |
| 313 | xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev))); |
| 314 | skb_dst_set(skb, dst); |
| 315 | skb->dev = tdev; |
| 316 | |
| 317 | err = dst_output(xi->net, skb->sk, skb); |
| 318 | if (net_xmit_eval(err) == 0) { |
| 319 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); |
| 320 | |
| 321 | u64_stats_update_begin(&tstats->syncp); |
| 322 | tstats->tx_bytes += length; |
| 323 | tstats->tx_packets++; |
| 324 | u64_stats_update_end(&tstats->syncp); |
| 325 | } else { |
| 326 | stats->tx_errors++; |
| 327 | stats->tx_aborted_errors++; |
| 328 | } |
| 329 | |
| 330 | return 0; |
| 331 | tx_err_link_failure: |
| 332 | stats->tx_carrier_errors++; |
| 333 | dst_link_failure(skb); |
| 334 | tx_err_dst_release: |
| 335 | dst_release(dst); |
| 336 | return err; |
| 337 | } |
| 338 | |
| 339 | static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev) |
| 340 | { |
| 341 | struct xfrm_if *xi = netdev_priv(dev); |
| 342 | struct net_device_stats *stats = &xi->dev->stats; |
Nicolas Dichtel | f042365d | 2020-01-13 09:32:47 +0100 | [diff] [blame] | 343 | struct dst_entry *dst = skb_dst(skb); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 344 | struct flowi fl; |
| 345 | int ret; |
| 346 | |
| 347 | memset(&fl, 0, sizeof(fl)); |
| 348 | |
| 349 | switch (skb->protocol) { |
| 350 | case htons(ETH_P_IPV6): |
| 351 | xfrm_decode_session(skb, &fl, AF_INET6); |
| 352 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); |
Nicolas Dichtel | f042365d | 2020-01-13 09:32:47 +0100 | [diff] [blame] | 353 | if (!dst) { |
| 354 | fl.u.ip6.flowi6_oif = dev->ifindex; |
| 355 | fl.u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC; |
| 356 | dst = ip6_route_output(dev_net(dev), NULL, &fl.u.ip6); |
| 357 | if (dst->error) { |
| 358 | dst_release(dst); |
| 359 | stats->tx_carrier_errors++; |
| 360 | goto tx_err; |
| 361 | } |
| 362 | skb_dst_set(skb, dst); |
| 363 | } |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 364 | break; |
| 365 | case htons(ETH_P_IP): |
| 366 | xfrm_decode_session(skb, &fl, AF_INET); |
| 367 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
Nicolas Dichtel | f042365d | 2020-01-13 09:32:47 +0100 | [diff] [blame] | 368 | if (!dst) { |
| 369 | struct rtable *rt; |
| 370 | |
| 371 | fl.u.ip4.flowi4_oif = dev->ifindex; |
| 372 | fl.u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC; |
| 373 | rt = __ip_route_output_key(dev_net(dev), &fl.u.ip4); |
| 374 | if (IS_ERR(rt)) { |
| 375 | stats->tx_carrier_errors++; |
| 376 | goto tx_err; |
| 377 | } |
| 378 | skb_dst_set(skb, &rt->dst); |
| 379 | } |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 380 | break; |
| 381 | default: |
| 382 | goto tx_err; |
| 383 | } |
| 384 | |
Nicolas Dichtel | 22d6552 | 2019-07-15 12:00:23 +0200 | [diff] [blame] | 385 | fl.flowi_oif = xi->p.link; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 386 | |
| 387 | ret = xfrmi_xmit2(skb, dev, &fl); |
| 388 | if (ret < 0) |
| 389 | goto tx_err; |
| 390 | |
| 391 | return NETDEV_TX_OK; |
| 392 | |
| 393 | tx_err: |
| 394 | stats->tx_errors++; |
| 395 | stats->tx_dropped++; |
| 396 | kfree_skb(skb); |
| 397 | return NETDEV_TX_OK; |
| 398 | } |
| 399 | |
| 400 | static int xfrmi4_err(struct sk_buff *skb, u32 info) |
| 401 | { |
| 402 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
| 403 | struct net *net = dev_net(skb->dev); |
| 404 | int protocol = iph->protocol; |
| 405 | struct ip_comp_hdr *ipch; |
| 406 | struct ip_esp_hdr *esph; |
| 407 | struct ip_auth_hdr *ah ; |
| 408 | struct xfrm_state *x; |
| 409 | struct xfrm_if *xi; |
| 410 | __be32 spi; |
| 411 | |
| 412 | switch (protocol) { |
| 413 | case IPPROTO_ESP: |
| 414 | esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); |
| 415 | spi = esph->spi; |
| 416 | break; |
| 417 | case IPPROTO_AH: |
| 418 | ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); |
| 419 | spi = ah->spi; |
| 420 | break; |
| 421 | case IPPROTO_COMP: |
| 422 | ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); |
| 423 | spi = htonl(ntohs(ipch->cpi)); |
| 424 | break; |
| 425 | default: |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | switch (icmp_hdr(skb)->type) { |
| 430 | case ICMP_DEST_UNREACH: |
| 431 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) |
| 432 | return 0; |
| 433 | case ICMP_REDIRECT: |
| 434 | break; |
| 435 | default: |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
| 440 | spi, protocol, AF_INET); |
| 441 | if (!x) |
| 442 | return 0; |
| 443 | |
| 444 | xi = xfrmi_lookup(net, x); |
| 445 | if (!xi) { |
| 446 | xfrm_state_put(x); |
| 447 | return -1; |
| 448 | } |
| 449 | |
| 450 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) |
Maciej Żenczykowski | d888f39 | 2018-09-25 20:56:26 -0700 | [diff] [blame] | 451 | ipv4_update_pmtu(skb, net, info, 0, protocol); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 452 | else |
Maciej Żenczykowski | 1042caa | 2018-09-25 20:56:27 -0700 | [diff] [blame] | 453 | ipv4_redirect(skb, net, 0, protocol); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 454 | xfrm_state_put(x); |
| 455 | |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| 460 | u8 type, u8 code, int offset, __be32 info) |
| 461 | { |
| 462 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
| 463 | struct net *net = dev_net(skb->dev); |
| 464 | int protocol = iph->nexthdr; |
| 465 | struct ip_comp_hdr *ipch; |
| 466 | struct ip_esp_hdr *esph; |
| 467 | struct ip_auth_hdr *ah; |
| 468 | struct xfrm_state *x; |
| 469 | struct xfrm_if *xi; |
| 470 | __be32 spi; |
| 471 | |
| 472 | switch (protocol) { |
| 473 | case IPPROTO_ESP: |
| 474 | esph = (struct ip_esp_hdr *)(skb->data + offset); |
| 475 | spi = esph->spi; |
| 476 | break; |
| 477 | case IPPROTO_AH: |
| 478 | ah = (struct ip_auth_hdr *)(skb->data + offset); |
| 479 | spi = ah->spi; |
| 480 | break; |
| 481 | case IPPROTO_COMP: |
| 482 | ipch = (struct ip_comp_hdr *)(skb->data + offset); |
| 483 | spi = htonl(ntohs(ipch->cpi)); |
| 484 | break; |
| 485 | default: |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | if (type != ICMPV6_PKT_TOOBIG && |
| 490 | type != NDISC_REDIRECT) |
| 491 | return 0; |
| 492 | |
| 493 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
| 494 | spi, protocol, AF_INET6); |
| 495 | if (!x) |
| 496 | return 0; |
| 497 | |
| 498 | xi = xfrmi_lookup(net, x); |
| 499 | if (!xi) { |
| 500 | xfrm_state_put(x); |
| 501 | return -1; |
| 502 | } |
| 503 | |
| 504 | if (type == NDISC_REDIRECT) |
| 505 | ip6_redirect(skb, net, skb->dev->ifindex, 0, |
| 506 | sock_net_uid(net, NULL)); |
| 507 | else |
| 508 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
| 509 | xfrm_state_put(x); |
| 510 | |
| 511 | return 0; |
| 512 | } |
| 513 | |
| 514 | static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p) |
| 515 | { |
| 516 | if (xi->p.link != p->link) |
| 517 | return -EINVAL; |
| 518 | |
| 519 | xi->p.if_id = p->if_id; |
| 520 | |
| 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p) |
| 525 | { |
Nicolas Dichtel | c5d1030 | 2019-07-15 12:00:22 +0200 | [diff] [blame] | 526 | struct net *net = xi->net; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 527 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| 528 | int err; |
| 529 | |
| 530 | xfrmi_unlink(xfrmn, xi); |
| 531 | synchronize_net(); |
| 532 | err = xfrmi_change(xi, p); |
| 533 | xfrmi_link(xfrmn, xi); |
| 534 | netdev_state_change(xi->dev); |
| 535 | return err; |
| 536 | } |
| 537 | |
| 538 | static void xfrmi_get_stats64(struct net_device *dev, |
| 539 | struct rtnl_link_stats64 *s) |
| 540 | { |
| 541 | int cpu; |
| 542 | |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 543 | for_each_possible_cpu(cpu) { |
| 544 | struct pcpu_sw_netstats *stats; |
| 545 | struct pcpu_sw_netstats tmp; |
| 546 | int start; |
| 547 | |
| 548 | stats = per_cpu_ptr(dev->tstats, cpu); |
| 549 | do { |
| 550 | start = u64_stats_fetch_begin_irq(&stats->syncp); |
| 551 | tmp.rx_packets = stats->rx_packets; |
| 552 | tmp.rx_bytes = stats->rx_bytes; |
| 553 | tmp.tx_packets = stats->tx_packets; |
| 554 | tmp.tx_bytes = stats->tx_bytes; |
| 555 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
| 556 | |
| 557 | s->rx_packets += tmp.rx_packets; |
| 558 | s->rx_bytes += tmp.rx_bytes; |
| 559 | s->tx_packets += tmp.tx_packets; |
| 560 | s->tx_bytes += tmp.tx_bytes; |
| 561 | } |
| 562 | |
| 563 | s->rx_dropped = dev->stats.rx_dropped; |
| 564 | s->tx_dropped = dev->stats.tx_dropped; |
| 565 | } |
| 566 | |
| 567 | static int xfrmi_get_iflink(const struct net_device *dev) |
| 568 | { |
| 569 | struct xfrm_if *xi = netdev_priv(dev); |
| 570 | |
Nicolas Dichtel | 22d6552 | 2019-07-15 12:00:23 +0200 | [diff] [blame] | 571 | return xi->p.link; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 572 | } |
| 573 | |
| 574 | |
| 575 | static const struct net_device_ops xfrmi_netdev_ops = { |
| 576 | .ndo_init = xfrmi_dev_init, |
| 577 | .ndo_uninit = xfrmi_dev_uninit, |
| 578 | .ndo_start_xmit = xfrmi_xmit, |
| 579 | .ndo_get_stats64 = xfrmi_get_stats64, |
| 580 | .ndo_get_iflink = xfrmi_get_iflink, |
| 581 | }; |
| 582 | |
| 583 | static void xfrmi_dev_setup(struct net_device *dev) |
| 584 | { |
| 585 | dev->netdev_ops = &xfrmi_netdev_ops; |
| 586 | dev->type = ARPHRD_NONE; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 587 | dev->mtu = ETH_DATA_LEN; |
| 588 | dev->min_mtu = ETH_MIN_MTU; |
Nicolas Dichtel | f042365d | 2020-01-13 09:32:47 +0100 | [diff] [blame] | 589 | dev->max_mtu = IP_MAX_MTU; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 590 | dev->flags = IFF_NOARP; |
| 591 | dev->needs_free_netdev = true; |
| 592 | dev->priv_destructor = xfrmi_dev_free; |
| 593 | netif_keep_dst(dev); |
Nicolas Dichtel | 22d6552 | 2019-07-15 12:00:23 +0200 | [diff] [blame] | 594 | |
| 595 | eth_broadcast_addr(dev->broadcast); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 596 | } |
| 597 | |
| 598 | static int xfrmi_dev_init(struct net_device *dev) |
| 599 | { |
| 600 | struct xfrm_if *xi = netdev_priv(dev); |
Nicolas Dichtel | 22d6552 | 2019-07-15 12:00:23 +0200 | [diff] [blame] | 601 | struct net_device *phydev = __dev_get_by_index(xi->net, xi->p.link); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 602 | int err; |
| 603 | |
| 604 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| 605 | if (!dev->tstats) |
| 606 | return -ENOMEM; |
| 607 | |
| 608 | err = gro_cells_init(&xi->gro_cells, dev); |
| 609 | if (err) { |
| 610 | free_percpu(dev->tstats); |
| 611 | return err; |
| 612 | } |
| 613 | |
| 614 | dev->features |= NETIF_F_LLTX; |
| 615 | |
Nicolas Dichtel | 22d6552 | 2019-07-15 12:00:23 +0200 | [diff] [blame] | 616 | if (phydev) { |
| 617 | dev->needed_headroom = phydev->needed_headroom; |
| 618 | dev->needed_tailroom = phydev->needed_tailroom; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 619 | |
Nicolas Dichtel | 22d6552 | 2019-07-15 12:00:23 +0200 | [diff] [blame] | 620 | if (is_zero_ether_addr(dev->dev_addr)) |
| 621 | eth_hw_addr_inherit(dev, phydev); |
| 622 | if (is_zero_ether_addr(dev->broadcast)) |
| 623 | memcpy(dev->broadcast, phydev->broadcast, |
| 624 | dev->addr_len); |
| 625 | } else { |
| 626 | eth_hw_addr_random(dev); |
| 627 | eth_broadcast_addr(dev->broadcast); |
| 628 | } |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 629 | |
| 630 | return 0; |
| 631 | } |
| 632 | |
| 633 | static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[], |
| 634 | struct netlink_ext_ack *extack) |
| 635 | { |
| 636 | return 0; |
| 637 | } |
| 638 | |
| 639 | static void xfrmi_netlink_parms(struct nlattr *data[], |
| 640 | struct xfrm_if_parms *parms) |
| 641 | { |
| 642 | memset(parms, 0, sizeof(*parms)); |
| 643 | |
| 644 | if (!data) |
| 645 | return; |
| 646 | |
| 647 | if (data[IFLA_XFRM_LINK]) |
| 648 | parms->link = nla_get_u32(data[IFLA_XFRM_LINK]); |
| 649 | |
| 650 | if (data[IFLA_XFRM_IF_ID]) |
| 651 | parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]); |
| 652 | } |
| 653 | |
| 654 | static int xfrmi_newlink(struct net *src_net, struct net_device *dev, |
| 655 | struct nlattr *tb[], struct nlattr *data[], |
| 656 | struct netlink_ext_ack *extack) |
| 657 | { |
| 658 | struct net *net = dev_net(dev); |
Nicolas Dichtel | 56c5ee1 | 2019-07-02 17:51:39 +0200 | [diff] [blame] | 659 | struct xfrm_if_parms p; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 660 | struct xfrm_if *xi; |
Nicolas Dichtel | 56c5ee1 | 2019-07-02 17:51:39 +0200 | [diff] [blame] | 661 | int err; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 662 | |
Nicolas Dichtel | 56c5ee1 | 2019-07-02 17:51:39 +0200 | [diff] [blame] | 663 | xfrmi_netlink_parms(data, &p); |
Nicolas Dichtel | 56c5ee1 | 2019-07-02 17:51:39 +0200 | [diff] [blame] | 664 | xi = xfrmi_locate(net, &p); |
| 665 | if (xi) |
| 666 | return -EEXIST; |
| 667 | |
| 668 | xi = netdev_priv(dev); |
| 669 | xi->p = p; |
| 670 | xi->net = net; |
| 671 | xi->dev = dev; |
Nicolas Dichtel | 56c5ee1 | 2019-07-02 17:51:39 +0200 | [diff] [blame] | 672 | |
| 673 | err = xfrmi_create(dev); |
Nicolas Dichtel | 56c5ee1 | 2019-07-02 17:51:39 +0200 | [diff] [blame] | 674 | return err; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 675 | } |
| 676 | |
| 677 | static void xfrmi_dellink(struct net_device *dev, struct list_head *head) |
| 678 | { |
| 679 | unregister_netdevice_queue(dev, head); |
| 680 | } |
| 681 | |
| 682 | static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], |
| 683 | struct nlattr *data[], |
| 684 | struct netlink_ext_ack *extack) |
| 685 | { |
Nicolas Dichtel | c5d1030 | 2019-07-15 12:00:22 +0200 | [diff] [blame] | 686 | struct xfrm_if *xi = netdev_priv(dev); |
| 687 | struct net *net = xi->net; |
Nicolas Dichtel | e9e7e85 | 2019-07-15 12:00:20 +0200 | [diff] [blame] | 688 | struct xfrm_if_parms p; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 689 | |
Nicolas Dichtel | e9e7e85 | 2019-07-15 12:00:20 +0200 | [diff] [blame] | 690 | xfrmi_netlink_parms(data, &p); |
| 691 | xi = xfrmi_locate(net, &p); |
Nicolas Dichtel | 56c5ee1 | 2019-07-02 17:51:39 +0200 | [diff] [blame] | 692 | if (!xi) { |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 693 | xi = netdev_priv(dev); |
| 694 | } else { |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 695 | if (xi->dev != dev) |
| 696 | return -EEXIST; |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 697 | } |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 698 | |
Nicolas Dichtel | e9e7e85 | 2019-07-15 12:00:20 +0200 | [diff] [blame] | 699 | return xfrmi_update(xi, &p); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 700 | } |
| 701 | |
| 702 | static size_t xfrmi_get_size(const struct net_device *dev) |
| 703 | { |
| 704 | return |
| 705 | /* IFLA_XFRM_LINK */ |
| 706 | nla_total_size(4) + |
| 707 | /* IFLA_XFRM_IF_ID */ |
| 708 | nla_total_size(4) + |
| 709 | 0; |
| 710 | } |
| 711 | |
| 712 | static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 713 | { |
| 714 | struct xfrm_if *xi = netdev_priv(dev); |
| 715 | struct xfrm_if_parms *parm = &xi->p; |
| 716 | |
| 717 | if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) || |
| 718 | nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id)) |
| 719 | goto nla_put_failure; |
| 720 | return 0; |
| 721 | |
| 722 | nla_put_failure: |
| 723 | return -EMSGSIZE; |
| 724 | } |
| 725 | |
Wei Yongjun | 211d6f2 | 2018-07-28 06:49:48 +0000 | [diff] [blame] | 726 | static struct net *xfrmi_get_link_net(const struct net_device *dev) |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 727 | { |
| 728 | struct xfrm_if *xi = netdev_priv(dev); |
| 729 | |
Nicolas Dichtel | c5d1030 | 2019-07-15 12:00:22 +0200 | [diff] [blame] | 730 | return xi->net; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 731 | } |
| 732 | |
| 733 | static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = { |
| 734 | [IFLA_XFRM_LINK] = { .type = NLA_U32 }, |
| 735 | [IFLA_XFRM_IF_ID] = { .type = NLA_U32 }, |
| 736 | }; |
| 737 | |
| 738 | static struct rtnl_link_ops xfrmi_link_ops __read_mostly = { |
| 739 | .kind = "xfrm", |
| 740 | .maxtype = IFLA_XFRM_MAX, |
| 741 | .policy = xfrmi_policy, |
| 742 | .priv_size = sizeof(struct xfrm_if), |
| 743 | .setup = xfrmi_dev_setup, |
| 744 | .validate = xfrmi_validate, |
| 745 | .newlink = xfrmi_newlink, |
| 746 | .dellink = xfrmi_dellink, |
| 747 | .changelink = xfrmi_changelink, |
| 748 | .get_size = xfrmi_get_size, |
| 749 | .fill_info = xfrmi_fill_info, |
| 750 | .get_link_net = xfrmi_get_link_net, |
| 751 | }; |
| 752 | |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 753 | static struct pernet_operations xfrmi_net_ops = { |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 754 | .id = &xfrmi_net_id, |
| 755 | .size = sizeof(struct xfrmi_net), |
| 756 | }; |
| 757 | |
| 758 | static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = { |
| 759 | .handler = xfrm6_rcv, |
| 760 | .cb_handler = xfrmi_rcv_cb, |
| 761 | .err_handler = xfrmi6_err, |
| 762 | .priority = 10, |
| 763 | }; |
| 764 | |
| 765 | static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = { |
| 766 | .handler = xfrm6_rcv, |
| 767 | .cb_handler = xfrmi_rcv_cb, |
| 768 | .err_handler = xfrmi6_err, |
| 769 | .priority = 10, |
| 770 | }; |
| 771 | |
| 772 | static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = { |
| 773 | .handler = xfrm6_rcv, |
| 774 | .cb_handler = xfrmi_rcv_cb, |
| 775 | .err_handler = xfrmi6_err, |
| 776 | .priority = 10, |
| 777 | }; |
| 778 | |
| 779 | static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = { |
| 780 | .handler = xfrm4_rcv, |
| 781 | .input_handler = xfrm_input, |
| 782 | .cb_handler = xfrmi_rcv_cb, |
| 783 | .err_handler = xfrmi4_err, |
| 784 | .priority = 10, |
| 785 | }; |
| 786 | |
| 787 | static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = { |
| 788 | .handler = xfrm4_rcv, |
| 789 | .input_handler = xfrm_input, |
| 790 | .cb_handler = xfrmi_rcv_cb, |
| 791 | .err_handler = xfrmi4_err, |
| 792 | .priority = 10, |
| 793 | }; |
| 794 | |
| 795 | static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = { |
| 796 | .handler = xfrm4_rcv, |
| 797 | .input_handler = xfrm_input, |
| 798 | .cb_handler = xfrmi_rcv_cb, |
| 799 | .err_handler = xfrmi4_err, |
| 800 | .priority = 10, |
| 801 | }; |
| 802 | |
| 803 | static int __init xfrmi4_init(void) |
| 804 | { |
| 805 | int err; |
| 806 | |
| 807 | err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP); |
| 808 | if (err < 0) |
| 809 | goto xfrm_proto_esp_failed; |
| 810 | err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH); |
| 811 | if (err < 0) |
| 812 | goto xfrm_proto_ah_failed; |
| 813 | err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); |
| 814 | if (err < 0) |
| 815 | goto xfrm_proto_comp_failed; |
| 816 | |
| 817 | return 0; |
| 818 | |
| 819 | xfrm_proto_comp_failed: |
| 820 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); |
| 821 | xfrm_proto_ah_failed: |
| 822 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); |
| 823 | xfrm_proto_esp_failed: |
| 824 | return err; |
| 825 | } |
| 826 | |
| 827 | static void xfrmi4_fini(void) |
| 828 | { |
| 829 | xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); |
| 830 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); |
| 831 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); |
| 832 | } |
| 833 | |
| 834 | static int __init xfrmi6_init(void) |
| 835 | { |
| 836 | int err; |
| 837 | |
| 838 | err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP); |
| 839 | if (err < 0) |
| 840 | goto xfrm_proto_esp_failed; |
| 841 | err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH); |
| 842 | if (err < 0) |
| 843 | goto xfrm_proto_ah_failed; |
| 844 | err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); |
| 845 | if (err < 0) |
| 846 | goto xfrm_proto_comp_failed; |
| 847 | |
| 848 | return 0; |
| 849 | |
| 850 | xfrm_proto_comp_failed: |
| 851 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); |
| 852 | xfrm_proto_ah_failed: |
| 853 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); |
| 854 | xfrm_proto_esp_failed: |
| 855 | return err; |
| 856 | } |
| 857 | |
| 858 | static void xfrmi6_fini(void) |
| 859 | { |
| 860 | xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); |
| 861 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); |
| 862 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); |
| 863 | } |
| 864 | |
| 865 | static const struct xfrm_if_cb xfrm_if_cb = { |
| 866 | .decode_session = xfrmi_decode_session, |
| 867 | }; |
| 868 | |
| 869 | static int __init xfrmi_init(void) |
| 870 | { |
| 871 | const char *msg; |
| 872 | int err; |
| 873 | |
| 874 | pr_info("IPsec XFRM device driver\n"); |
| 875 | |
| 876 | msg = "tunnel device"; |
| 877 | err = register_pernet_device(&xfrmi_net_ops); |
| 878 | if (err < 0) |
| 879 | goto pernet_dev_failed; |
| 880 | |
| 881 | msg = "xfrm4 protocols"; |
| 882 | err = xfrmi4_init(); |
| 883 | if (err < 0) |
| 884 | goto xfrmi4_failed; |
| 885 | |
| 886 | msg = "xfrm6 protocols"; |
| 887 | err = xfrmi6_init(); |
| 888 | if (err < 0) |
| 889 | goto xfrmi6_failed; |
| 890 | |
| 891 | |
| 892 | msg = "netlink interface"; |
| 893 | err = rtnl_link_register(&xfrmi_link_ops); |
| 894 | if (err < 0) |
| 895 | goto rtnl_link_failed; |
| 896 | |
| 897 | xfrm_if_register_cb(&xfrm_if_cb); |
| 898 | |
| 899 | return err; |
| 900 | |
| 901 | rtnl_link_failed: |
| 902 | xfrmi6_fini(); |
| 903 | xfrmi6_failed: |
| 904 | xfrmi4_fini(); |
| 905 | xfrmi4_failed: |
| 906 | unregister_pernet_device(&xfrmi_net_ops); |
| 907 | pernet_dev_failed: |
| 908 | pr_err("xfrmi init: failed to register %s\n", msg); |
| 909 | return err; |
| 910 | } |
| 911 | |
| 912 | static void __exit xfrmi_fini(void) |
| 913 | { |
| 914 | xfrm_if_unregister_cb(); |
| 915 | rtnl_link_unregister(&xfrmi_link_ops); |
| 916 | xfrmi4_fini(); |
| 917 | xfrmi6_fini(); |
| 918 | unregister_pernet_device(&xfrmi_net_ops); |
| 919 | } |
| 920 | |
| 921 | module_init(xfrmi_init); |
| 922 | module_exit(xfrmi_fini); |
| 923 | MODULE_LICENSE("GPL"); |
| 924 | MODULE_ALIAS_RTNL_LINK("xfrm"); |
| 925 | MODULE_ALIAS_NETDEV("xfrm0"); |
| 926 | MODULE_AUTHOR("Steffen Klassert"); |
| 927 | MODULE_DESCRIPTION("XFRM virtual interface"); |