projects / mirror_ubuntu-eoan-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| f203b76d SK |
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 | ||
| 025c65e1 MW |
73 | static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb, |
| 74 | unsigned short family) | |
| f203b76d SK |
75 | { |
| 76 | struct xfrmi_net *xfrmn; | |
| f203b76d | 77 | struct xfrm_if *xi; |
| 025c65e1 | 78 | int ifindex = 0; |
| f203b76d | 79 | |
| 660899dd | 80 | if (!secpath_exists(skb) || !skb->dev) |
| f203b76d SK |
81 | return NULL; |
| 82 | ||
| 025c65e1 MW |
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 | ||
| 660899dd | 94 | xfrmn = net_generic(xs_net(xfrm_input_state(skb)), xfrmi_net_id); |
| f203b76d SK |
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 | { | |
| 4da40259 LR |
130 | struct xfrm_if *xi = netdev_priv(dev); |
| 131 | ||
| 132 | gro_cells_destroy(&xi->gro_cells); | |
| f203b76d SK |
133 | free_percpu(dev->tstats); |
| 134 | } | |
| 135 | ||
| 56c5ee1a | 136 | static int xfrmi_create(struct net_device *dev) |
| f203b76d SK |
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 | ||
| 148 | strcpy(xi->p.name, dev->name); | |
| 149 | ||
| 150 | dev_hold(dev); | |
| 151 | xfrmi_link(xfrmn, xi); | |
| 152 | ||
| 153 | return 0; | |
| 154 | ||
| 155 | out: | |
| 156 | return err; | |
| 157 | } | |
| 158 | ||
| 56c5ee1a | 159 | static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p) |
| f203b76d SK |
160 | { |
| 161 | struct xfrm_if __rcu **xip; | |
| 162 | struct xfrm_if *xi; | |
| 163 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
| 164 | ||
| 165 | for (xip = &xfrmn->xfrmi[0]; | |
| 166 | (xi = rtnl_dereference(*xip)) != NULL; | |
| 56c5ee1a ND |
167 | xip = &xi->next) |
| 168 | if (xi->p.if_id == p->if_id) | |
| f203b76d | 169 | return xi; |
| 56c5ee1a ND |
170 | |
| 171 | return NULL; | |
| f203b76d SK |
172 | } |
| 173 | ||
| 174 | static void xfrmi_dev_uninit(struct net_device *dev) | |
| 175 | { | |
| 176 | struct xfrm_if *xi = netdev_priv(dev); | |
| 177 | struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id); | |
| 178 | ||
| 179 | xfrmi_unlink(xfrmn, xi); | |
| 180 | dev_put(xi->phydev); | |
| 181 | dev_put(dev); | |
| 182 | } | |
| 183 | ||
| 184 | static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet) | |
| 185 | { | |
| 186 | skb->tstamp = 0; | |
| 187 | skb->pkt_type = PACKET_HOST; | |
| 188 | skb->skb_iif = 0; | |
| 189 | skb->ignore_df = 0; | |
| 190 | skb_dst_drop(skb); | |
| 191 | nf_reset(skb); | |
| 192 | nf_reset_trace(skb); | |
| 193 | ||
| 194 | if (!xnet) | |
| 195 | return; | |
| 196 | ||
| 197 | ipvs_reset(skb); | |
| 198 | secpath_reset(skb); | |
| 199 | skb_orphan(skb); | |
| 200 | skb->mark = 0; | |
| 201 | } | |
| 202 | ||
| 203 | static int xfrmi_rcv_cb(struct sk_buff *skb, int err) | |
| 204 | { | |
| 4c145dce | 205 | const struct xfrm_mode *inner_mode; |
| f203b76d | 206 | struct pcpu_sw_netstats *tstats; |
| f203b76d SK |
207 | struct net_device *dev; |
| 208 | struct xfrm_state *x; | |
| 209 | struct xfrm_if *xi; | |
| 210 | bool xnet; | |
| 211 | ||
| 26912e37 | 212 | if (err && !secpath_exists(skb)) |
| f203b76d SK |
213 | return 0; |
| 214 | ||
| 215 | x = xfrm_input_state(skb); | |
| 216 | ||
| 217 | xi = xfrmi_lookup(xs_net(x), x); | |
| 218 | if (!xi) | |
| 219 | return 1; | |
| 220 | ||
| 221 | dev = xi->dev; | |
| 222 | skb->dev = dev; | |
| 223 | ||
| 224 | if (err) { | |
| 225 | dev->stats.rx_errors++; | |
| 226 | dev->stats.rx_dropped++; | |
| 227 | ||
| 228 | return 0; | |
| 229 | } | |
| 230 | ||
| 231 | xnet = !net_eq(xi->net, dev_net(skb->dev)); | |
| 232 | ||
| 233 | if (xnet) { | |
| c9500d7b | 234 | inner_mode = &x->inner_mode; |
| f203b76d SK |
235 | |
| 236 | if (x->sel.family == AF_UNSPEC) { | |
| 237 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
| 238 | if (inner_mode == NULL) { | |
| 239 | XFRM_INC_STATS(dev_net(skb->dev), | |
| 240 | LINUX_MIB_XFRMINSTATEMODEERROR); | |
| 241 | return -EINVAL; | |
| 242 | } | |
| 243 | } | |
| 244 | ||
| 245 | if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, | |
| b45714b1 | 246 | inner_mode->family)) |
| f203b76d SK |
247 | return -EPERM; |
| 248 | } | |
| 249 | ||
| 250 | xfrmi_scrub_packet(skb, xnet); | |
| 251 | ||
| 252 | tstats = this_cpu_ptr(dev->tstats); | |
| 253 | ||
| 254 | u64_stats_update_begin(&tstats->syncp); | |
| 255 | tstats->rx_packets++; | |
| 256 | tstats->rx_bytes += skb->len; | |
| 257 | u64_stats_update_end(&tstats->syncp); | |
| 258 | ||
| 259 | return 0; | |
| 260 | } | |
| 261 | ||
| 262 | static int | |
| 263 | xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) | |
| 264 | { | |
| 265 | struct xfrm_if *xi = netdev_priv(dev); | |
| 266 | struct net_device_stats *stats = &xi->dev->stats; | |
| 267 | struct dst_entry *dst = skb_dst(skb); | |
| 268 | unsigned int length = skb->len; | |
| 269 | struct net_device *tdev; | |
| 270 | struct xfrm_state *x; | |
| 271 | int err = -1; | |
| 272 | int mtu; | |
| 273 | ||
| 274 | if (!dst) | |
| 275 | goto tx_err_link_failure; | |
| 276 | ||
| f203b76d | 277 | dst_hold(dst); |
| bc56b334 | 278 | dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id); |
| f203b76d SK |
279 | if (IS_ERR(dst)) { |
| 280 | err = PTR_ERR(dst); | |
| 281 | dst = NULL; | |
| 282 | goto tx_err_link_failure; | |
| 283 | } | |
| 284 | ||
| 285 | x = dst->xfrm; | |
| 286 | if (!x) | |
| 287 | goto tx_err_link_failure; | |
| 288 | ||
| 289 | if (x->if_id != xi->p.if_id) | |
| 290 | goto tx_err_link_failure; | |
| 291 | ||
| 292 | tdev = dst->dev; | |
| 293 | ||
| 294 | if (tdev == dev) { | |
| 295 | stats->collisions++; | |
| 296 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
| 297 | xi->p.name); | |
| 298 | goto tx_err_dst_release; | |
| 299 | } | |
| 300 | ||
| 301 | mtu = dst_mtu(dst); | |
| 302 | if (!skb->ignore_df && skb->len > mtu) { | |
| 303 | skb_dst_update_pmtu(skb, mtu); | |
| 304 | ||
| 305 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
| 306 | if (mtu < IPV6_MIN_MTU) | |
| 307 | mtu = IPV6_MIN_MTU; | |
| 308 | ||
| 309 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
| 310 | } else { | |
| 311 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
| 312 | htonl(mtu)); | |
| 313 | } | |
| 314 | ||
| 315 | dst_release(dst); | |
| 316 | return -EMSGSIZE; | |
| 317 | } | |
| 318 | ||
| 319 | xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev))); | |
| 320 | skb_dst_set(skb, dst); | |
| 321 | skb->dev = tdev; | |
| 322 | ||
| 323 | err = dst_output(xi->net, skb->sk, skb); | |
| 324 | if (net_xmit_eval(err) == 0) { | |
| 325 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); | |
| 326 | ||
| 327 | u64_stats_update_begin(&tstats->syncp); | |
| 328 | tstats->tx_bytes += length; | |
| 329 | tstats->tx_packets++; | |
| 330 | u64_stats_update_end(&tstats->syncp); | |
| 331 | } else { | |
| 332 | stats->tx_errors++; | |
| 333 | stats->tx_aborted_errors++; | |
| 334 | } | |
| 335 | ||
| 336 | return 0; | |
| 337 | tx_err_link_failure: | |
| 338 | stats->tx_carrier_errors++; | |
| 339 | dst_link_failure(skb); | |
| 340 | tx_err_dst_release: | |
| 341 | dst_release(dst); | |
| 342 | return err; | |
| 343 | } | |
| 344 | ||
| 345 | static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev) | |
| 346 | { | |
| 347 | struct xfrm_if *xi = netdev_priv(dev); | |
| 348 | struct net_device_stats *stats = &xi->dev->stats; | |
| 349 | struct flowi fl; | |
| 350 | int ret; | |
| 351 | ||
| 352 | memset(&fl, 0, sizeof(fl)); | |
| 353 | ||
| 354 | switch (skb->protocol) { | |
| 355 | case htons(ETH_P_IPV6): | |
| 356 | xfrm_decode_session(skb, &fl, AF_INET6); | |
| 357 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); | |
| 358 | break; | |
| 359 | case htons(ETH_P_IP): | |
| 360 | xfrm_decode_session(skb, &fl, AF_INET); | |
| 361 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
| 362 | break; | |
| 363 | default: | |
| 364 | goto tx_err; | |
| 365 | } | |
| 366 | ||
| 367 | fl.flowi_oif = xi->phydev->ifindex; | |
| 368 | ||
| 369 | ret = xfrmi_xmit2(skb, dev, &fl); | |
| 370 | if (ret < 0) | |
| 371 | goto tx_err; | |
| 372 | ||
| 373 | return NETDEV_TX_OK; | |
| 374 | ||
| 375 | tx_err: | |
| 376 | stats->tx_errors++; | |
| 377 | stats->tx_dropped++; | |
| 378 | kfree_skb(skb); | |
| 379 | return NETDEV_TX_OK; | |
| 380 | } | |
| 381 | ||
| 382 | static int xfrmi4_err(struct sk_buff *skb, u32 info) | |
| 383 | { | |
| 384 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
| 385 | struct net *net = dev_net(skb->dev); | |
| 386 | int protocol = iph->protocol; | |
| 387 | struct ip_comp_hdr *ipch; | |
| 388 | struct ip_esp_hdr *esph; | |
| 389 | struct ip_auth_hdr *ah ; | |
| 390 | struct xfrm_state *x; | |
| 391 | struct xfrm_if *xi; | |
| 392 | __be32 spi; | |
| 393 | ||
| 394 | switch (protocol) { | |
| 395 | case IPPROTO_ESP: | |
| 396 | esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); | |
| 397 | spi = esph->spi; | |
| 398 | break; | |
| 399 | case IPPROTO_AH: | |
| 400 | ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); | |
| 401 | spi = ah->spi; | |
| 402 | break; | |
| 403 | case IPPROTO_COMP: | |
| 404 | ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); | |
| 405 | spi = htonl(ntohs(ipch->cpi)); | |
| 406 | break; | |
| 407 | default: | |
| 408 | return 0; | |
| 409 | } | |
| 410 | ||
| 411 | switch (icmp_hdr(skb)->type) { | |
| 412 | case ICMP_DEST_UNREACH: | |
| 413 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) | |
| 414 | return 0; | |
| 415 | case ICMP_REDIRECT: | |
| 416 | break; | |
| 417 | default: | |
| 418 | return 0; | |
| 419 | } | |
| 420 | ||
| 421 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, | |
| 422 | spi, protocol, AF_INET); | |
| 423 | if (!x) | |
| 424 | return 0; | |
| 425 | ||
| 426 | xi = xfrmi_lookup(net, x); | |
| 427 | if (!xi) { | |
| 428 | xfrm_state_put(x); | |
| 429 | return -1; | |
| 430 | } | |
| 431 | ||
| 432 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) | |
| d888f396 | 433 | ipv4_update_pmtu(skb, net, info, 0, protocol); |
| f203b76d | 434 | else |
| 1042caa7 | 435 | ipv4_redirect(skb, net, 0, protocol); |
| f203b76d SK |
436 | xfrm_state_put(x); |
| 437 | ||
| 438 | return 0; | |
| 439 | } | |
| 440 | ||
| 441 | static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
| 442 | u8 type, u8 code, int offset, __be32 info) | |
| 443 | { | |
| 444 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; | |
| 445 | struct net *net = dev_net(skb->dev); | |
| 446 | int protocol = iph->nexthdr; | |
| 447 | struct ip_comp_hdr *ipch; | |
| 448 | struct ip_esp_hdr *esph; | |
| 449 | struct ip_auth_hdr *ah; | |
| 450 | struct xfrm_state *x; | |
| 451 | struct xfrm_if *xi; | |
| 452 | __be32 spi; | |
| 453 | ||
| 454 | switch (protocol) { | |
| 455 | case IPPROTO_ESP: | |
| 456 | esph = (struct ip_esp_hdr *)(skb->data + offset); | |
| 457 | spi = esph->spi; | |
| 458 | break; | |
| 459 | case IPPROTO_AH: | |
| 460 | ah = (struct ip_auth_hdr *)(skb->data + offset); | |
| 461 | spi = ah->spi; | |
| 462 | break; | |
| 463 | case IPPROTO_COMP: | |
| 464 | ipch = (struct ip_comp_hdr *)(skb->data + offset); | |
| 465 | spi = htonl(ntohs(ipch->cpi)); | |
| 466 | break; | |
| 467 | default: | |
| 468 | return 0; | |
| 469 | } | |
| 470 | ||
| 471 | if (type != ICMPV6_PKT_TOOBIG && | |
| 472 | type != NDISC_REDIRECT) | |
| 473 | return 0; | |
| 474 | ||
| 475 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, | |
| 476 | spi, protocol, AF_INET6); | |
| 477 | if (!x) | |
| 478 | return 0; | |
| 479 | ||
| 480 | xi = xfrmi_lookup(net, x); | |
| 481 | if (!xi) { | |
| 482 | xfrm_state_put(x); | |
| 483 | return -1; | |
| 484 | } | |
| 485 | ||
| 486 | if (type == NDISC_REDIRECT) | |
| 487 | ip6_redirect(skb, net, skb->dev->ifindex, 0, | |
| 488 | sock_net_uid(net, NULL)); | |
| 489 | else | |
| 490 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); | |
| 491 | xfrm_state_put(x); | |
| 492 | ||
| 493 | return 0; | |
| 494 | } | |
| 495 | ||
| 496 | static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p) | |
| 497 | { | |
| 498 | if (xi->p.link != p->link) | |
| 499 | return -EINVAL; | |
| 500 | ||
| 501 | xi->p.if_id = p->if_id; | |
| 502 | ||
| 503 | return 0; | |
| 504 | } | |
| 505 | ||
| 506 | static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p) | |
| 507 | { | |
| 508 | struct net *net = dev_net(xi->dev); | |
| 509 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
| 510 | int err; | |
| 511 | ||
| 512 | xfrmi_unlink(xfrmn, xi); | |
| 513 | synchronize_net(); | |
| 514 | err = xfrmi_change(xi, p); | |
| 515 | xfrmi_link(xfrmn, xi); | |
| 516 | netdev_state_change(xi->dev); | |
| 517 | return err; | |
| 518 | } | |
| 519 | ||
| 520 | static void xfrmi_get_stats64(struct net_device *dev, | |
| 521 | struct rtnl_link_stats64 *s) | |
| 522 | { | |
| 523 | int cpu; | |
| 524 | ||
| f203b76d SK |
525 | for_each_possible_cpu(cpu) { |
| 526 | struct pcpu_sw_netstats *stats; | |
| 527 | struct pcpu_sw_netstats tmp; | |
| 528 | int start; | |
| 529 | ||
| 530 | stats = per_cpu_ptr(dev->tstats, cpu); | |
| 531 | do { | |
| 532 | start = u64_stats_fetch_begin_irq(&stats->syncp); | |
| 533 | tmp.rx_packets = stats->rx_packets; | |
| 534 | tmp.rx_bytes = stats->rx_bytes; | |
| 535 | tmp.tx_packets = stats->tx_packets; | |
| 536 | tmp.tx_bytes = stats->tx_bytes; | |
| 537 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); | |
| 538 | ||
| 539 | s->rx_packets += tmp.rx_packets; | |
| 540 | s->rx_bytes += tmp.rx_bytes; | |
| 541 | s->tx_packets += tmp.tx_packets; | |
| 542 | s->tx_bytes += tmp.tx_bytes; | |
| 543 | } | |
| 544 | ||
| 545 | s->rx_dropped = dev->stats.rx_dropped; | |
| 546 | s->tx_dropped = dev->stats.tx_dropped; | |
| 547 | } | |
| 548 | ||
| 549 | static int xfrmi_get_iflink(const struct net_device *dev) | |
| 550 | { | |
| 551 | struct xfrm_if *xi = netdev_priv(dev); | |
| 552 | ||
| 553 | return xi->phydev->ifindex; | |
| 554 | } | |
| 555 | ||
| 556 | ||
| 557 | static const struct net_device_ops xfrmi_netdev_ops = { | |
| 558 | .ndo_init = xfrmi_dev_init, | |
| 559 | .ndo_uninit = xfrmi_dev_uninit, | |
| 560 | .ndo_start_xmit = xfrmi_xmit, | |
| 561 | .ndo_get_stats64 = xfrmi_get_stats64, | |
| 562 | .ndo_get_iflink = xfrmi_get_iflink, | |
| 563 | }; | |
| 564 | ||
| 565 | static void xfrmi_dev_setup(struct net_device *dev) | |
| 566 | { | |
| 567 | dev->netdev_ops = &xfrmi_netdev_ops; | |
| 568 | dev->type = ARPHRD_NONE; | |
| 569 | dev->hard_header_len = ETH_HLEN; | |
| 570 | dev->min_header_len = ETH_HLEN; | |
| 571 | dev->mtu = ETH_DATA_LEN; | |
| 572 | dev->min_mtu = ETH_MIN_MTU; | |
| 573 | dev->max_mtu = ETH_DATA_LEN; | |
| 574 | dev->addr_len = ETH_ALEN; | |
| 575 | dev->flags = IFF_NOARP; | |
| 576 | dev->needs_free_netdev = true; | |
| 577 | dev->priv_destructor = xfrmi_dev_free; | |
| 578 | netif_keep_dst(dev); | |
| 579 | } | |
| 580 | ||
| 581 | static int xfrmi_dev_init(struct net_device *dev) | |
| 582 | { | |
| 583 | struct xfrm_if *xi = netdev_priv(dev); | |
| 584 | struct net_device *phydev = xi->phydev; | |
| 585 | int err; | |
| 586 | ||
| 587 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
| 588 | if (!dev->tstats) | |
| 589 | return -ENOMEM; | |
| 590 | ||
| 591 | err = gro_cells_init(&xi->gro_cells, dev); | |
| 592 | if (err) { | |
| 593 | free_percpu(dev->tstats); | |
| 594 | return err; | |
| 595 | } | |
| 596 | ||
| 597 | dev->features |= NETIF_F_LLTX; | |
| 598 | ||
| 599 | dev->needed_headroom = phydev->needed_headroom; | |
| 600 | dev->needed_tailroom = phydev->needed_tailroom; | |
| 601 | ||
| 602 | if (is_zero_ether_addr(dev->dev_addr)) | |
| 603 | eth_hw_addr_inherit(dev, phydev); | |
| 604 | if (is_zero_ether_addr(dev->broadcast)) | |
| 605 | memcpy(dev->broadcast, phydev->broadcast, dev->addr_len); | |
| 606 | ||
| 607 | return 0; | |
| 608 | } | |
| 609 | ||
| 610 | static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[], | |
| 611 | struct netlink_ext_ack *extack) | |
| 612 | { | |
| 613 | return 0; | |
| 614 | } | |
| 615 | ||
| 616 | static void xfrmi_netlink_parms(struct nlattr *data[], | |
| 617 | struct xfrm_if_parms *parms) | |
| 618 | { | |
| 619 | memset(parms, 0, sizeof(*parms)); | |
| 620 | ||
| 621 | if (!data) | |
| 622 | return; | |
| 623 | ||
| 624 | if (data[IFLA_XFRM_LINK]) | |
| 625 | parms->link = nla_get_u32(data[IFLA_XFRM_LINK]); | |
| 626 | ||
| 627 | if (data[IFLA_XFRM_IF_ID]) | |
| 628 | parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]); | |
| 629 | } | |
| 630 | ||
| 631 | static int xfrmi_newlink(struct net *src_net, struct net_device *dev, | |
| 632 | struct nlattr *tb[], struct nlattr *data[], | |
| 633 | struct netlink_ext_ack *extack) | |
| 634 | { | |
| 635 | struct net *net = dev_net(dev); | |
| 56c5ee1a | 636 | struct xfrm_if_parms p; |
| f203b76d | 637 | struct xfrm_if *xi; |
| 56c5ee1a | 638 | int err; |
| f203b76d | 639 | |
| 56c5ee1a | 640 | xfrmi_netlink_parms(data, &p); |
| f203b76d SK |
641 | |
| 642 | if (!tb[IFLA_IFNAME]) | |
| 643 | return -EINVAL; | |
| 644 | ||
| 56c5ee1a | 645 | nla_strlcpy(p.name, tb[IFLA_IFNAME], IFNAMSIZ); |
| f203b76d | 646 | |
| 56c5ee1a ND |
647 | xi = xfrmi_locate(net, &p); |
| 648 | if (xi) | |
| 649 | return -EEXIST; | |
| 650 | ||
| 651 | xi = netdev_priv(dev); | |
| 652 | xi->p = p; | |
| 653 | xi->net = net; | |
| 654 | xi->dev = dev; | |
| 655 | xi->phydev = dev_get_by_index(net, p.link); | |
| 656 | if (!xi->phydev) | |
| 657 | return -ENODEV; | |
| 658 | ||
| 659 | err = xfrmi_create(dev); | |
| 660 | if (err < 0) | |
| 661 | dev_put(xi->phydev); | |
| 662 | return err; | |
| f203b76d SK |
663 | } |
| 664 | ||
| 665 | static void xfrmi_dellink(struct net_device *dev, struct list_head *head) | |
| 666 | { | |
| 667 | unregister_netdevice_queue(dev, head); | |
| 668 | } | |
| 669 | ||
| 670 | static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], | |
| 671 | struct nlattr *data[], | |
| 672 | struct netlink_ext_ack *extack) | |
| 673 | { | |
| 674 | struct xfrm_if *xi = netdev_priv(dev); | |
| 675 | struct net *net = dev_net(dev); | |
| 676 | ||
| 677 | xfrmi_netlink_parms(data, &xi->p); | |
| 678 | ||
| 56c5ee1a ND |
679 | xi = xfrmi_locate(net, &xi->p); |
| 680 | if (!xi) { | |
| 44e2b838 BW |
681 | xi = netdev_priv(dev); |
| 682 | } else { | |
| f203b76d SK |
683 | if (xi->dev != dev) |
| 684 | return -EEXIST; | |
| 44e2b838 | 685 | } |
| f203b76d SK |
686 | |
| 687 | return xfrmi_update(xi, &xi->p); | |
| 688 | } | |
| 689 | ||
| 690 | static size_t xfrmi_get_size(const struct net_device *dev) | |
| 691 | { | |
| 692 | return | |
| 693 | /* IFLA_XFRM_LINK */ | |
| 694 | nla_total_size(4) + | |
| 695 | /* IFLA_XFRM_IF_ID */ | |
| 696 | nla_total_size(4) + | |
| 697 | 0; | |
| 698 | } | |
| 699 | ||
| 700 | static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
| 701 | { | |
| 702 | struct xfrm_if *xi = netdev_priv(dev); | |
| 703 | struct xfrm_if_parms *parm = &xi->p; | |
| 704 | ||
| 705 | if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) || | |
| 706 | nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id)) | |
| 707 | goto nla_put_failure; | |
| 708 | return 0; | |
| 709 | ||
| 710 | nla_put_failure: | |
| 711 | return -EMSGSIZE; | |
| 712 | } | |
| 713 | ||
| 211d6f2d | 714 | static struct net *xfrmi_get_link_net(const struct net_device *dev) |
| f203b76d SK |
715 | { |
| 716 | struct xfrm_if *xi = netdev_priv(dev); | |
| 717 | ||
| 718 | return dev_net(xi->phydev); | |
| 719 | } | |
| 720 | ||
| 721 | static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = { | |
| 722 | [IFLA_XFRM_LINK] = { .type = NLA_U32 }, | |
| 723 | [IFLA_XFRM_IF_ID] = { .type = NLA_U32 }, | |
| 724 | }; | |
| 725 | ||
| 726 | static struct rtnl_link_ops xfrmi_link_ops __read_mostly = { | |
| 727 | .kind = "xfrm", | |
| 728 | .maxtype = IFLA_XFRM_MAX, | |
| 729 | .policy = xfrmi_policy, | |
| 730 | .priv_size = sizeof(struct xfrm_if), | |
| 731 | .setup = xfrmi_dev_setup, | |
| 732 | .validate = xfrmi_validate, | |
| 733 | .newlink = xfrmi_newlink, | |
| 734 | .dellink = xfrmi_dellink, | |
| 735 | .changelink = xfrmi_changelink, | |
| 736 | .get_size = xfrmi_get_size, | |
| 737 | .fill_info = xfrmi_fill_info, | |
| 738 | .get_link_net = xfrmi_get_link_net, | |
| 739 | }; | |
| 740 | ||
| 741 | static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn) | |
| 742 | { | |
| 743 | struct xfrm_if *xi; | |
| 744 | LIST_HEAD(list); | |
| 745 | ||
| 746 | xi = rtnl_dereference(xfrmn->xfrmi[0]); | |
| 747 | if (!xi) | |
| 748 | return; | |
| 749 | ||
| 750 | unregister_netdevice_queue(xi->dev, &list); | |
| 751 | unregister_netdevice_many(&list); | |
| 752 | } | |
| 753 | ||
| f203b76d SK |
754 | static void __net_exit xfrmi_exit_net(struct net *net) |
| 755 | { | |
| 756 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); | |
| 757 | ||
| 758 | rtnl_lock(); | |
| 759 | xfrmi_destroy_interfaces(xfrmn); | |
| 760 | rtnl_unlock(); | |
| 761 | } | |
| 762 | ||
| 763 | static struct pernet_operations xfrmi_net_ops = { | |
| f203b76d SK |
764 | .exit = xfrmi_exit_net, |
| 765 | .id = &xfrmi_net_id, | |
| 766 | .size = sizeof(struct xfrmi_net), | |
| 767 | }; | |
| 768 | ||
| 769 | static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = { | |
| 770 | .handler = xfrm6_rcv, | |
| 771 | .cb_handler = xfrmi_rcv_cb, | |
| 772 | .err_handler = xfrmi6_err, | |
| 773 | .priority = 10, | |
| 774 | }; | |
| 775 | ||
| 776 | static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = { | |
| 777 | .handler = xfrm6_rcv, | |
| 778 | .cb_handler = xfrmi_rcv_cb, | |
| 779 | .err_handler = xfrmi6_err, | |
| 780 | .priority = 10, | |
| 781 | }; | |
| 782 | ||
| 783 | static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = { | |
| 784 | .handler = xfrm6_rcv, | |
| 785 | .cb_handler = xfrmi_rcv_cb, | |
| 786 | .err_handler = xfrmi6_err, | |
| 787 | .priority = 10, | |
| 788 | }; | |
| 789 | ||
| 790 | static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = { | |
| 791 | .handler = xfrm4_rcv, | |
| 792 | .input_handler = xfrm_input, | |
| 793 | .cb_handler = xfrmi_rcv_cb, | |
| 794 | .err_handler = xfrmi4_err, | |
| 795 | .priority = 10, | |
| 796 | }; | |
| 797 | ||
| 798 | static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = { | |
| 799 | .handler = xfrm4_rcv, | |
| 800 | .input_handler = xfrm_input, | |
| 801 | .cb_handler = xfrmi_rcv_cb, | |
| 802 | .err_handler = xfrmi4_err, | |
| 803 | .priority = 10, | |
| 804 | }; | |
| 805 | ||
| 806 | static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = { | |
| 807 | .handler = xfrm4_rcv, | |
| 808 | .input_handler = xfrm_input, | |
| 809 | .cb_handler = xfrmi_rcv_cb, | |
| 810 | .err_handler = xfrmi4_err, | |
| 811 | .priority = 10, | |
| 812 | }; | |
| 813 | ||
| 814 | static int __init xfrmi4_init(void) | |
| 815 | { | |
| 816 | int err; | |
| 817 | ||
| 818 | err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
| 819 | if (err < 0) | |
| 820 | goto xfrm_proto_esp_failed; | |
| 821 | err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH); | |
| 822 | if (err < 0) | |
| 823 | goto xfrm_proto_ah_failed; | |
| 824 | err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); | |
| 825 | if (err < 0) | |
| 826 | goto xfrm_proto_comp_failed; | |
| 827 | ||
| 828 | return 0; | |
| 829 | ||
| 830 | xfrm_proto_comp_failed: | |
| 831 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); | |
| 832 | xfrm_proto_ah_failed: | |
| 833 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
| 834 | xfrm_proto_esp_failed: | |
| 835 | return err; | |
| 836 | } | |
| 837 | ||
| 838 | static void xfrmi4_fini(void) | |
| 839 | { | |
| 840 | xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); | |
| 841 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); | |
| 842 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); | |
| 843 | } | |
| 844 | ||
| 845 | static int __init xfrmi6_init(void) | |
| 846 | { | |
| 847 | int err; | |
| 848 | ||
| 849 | err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
| 850 | if (err < 0) | |
| 851 | goto xfrm_proto_esp_failed; | |
| 852 | err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH); | |
| 853 | if (err < 0) | |
| 854 | goto xfrm_proto_ah_failed; | |
| 855 | err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); | |
| 856 | if (err < 0) | |
| 857 | goto xfrm_proto_comp_failed; | |
| 858 | ||
| 859 | return 0; | |
| 860 | ||
| 861 | xfrm_proto_comp_failed: | |
| 862 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); | |
| 863 | xfrm_proto_ah_failed: | |
| 864 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
| 865 | xfrm_proto_esp_failed: | |
| 866 | return err; | |
| 867 | } | |
| 868 | ||
| 869 | static void xfrmi6_fini(void) | |
| 870 | { | |
| 871 | xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); | |
| 872 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); | |
| 873 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); | |
| 874 | } | |
| 875 | ||
| 876 | static const struct xfrm_if_cb xfrm_if_cb = { | |
| 877 | .decode_session = xfrmi_decode_session, | |
| 878 | }; | |
| 879 | ||
| 880 | static int __init xfrmi_init(void) | |
| 881 | { | |
| 882 | const char *msg; | |
| 883 | int err; | |
| 884 | ||
| 885 | pr_info("IPsec XFRM device driver\n"); | |
| 886 | ||
| 887 | msg = "tunnel device"; | |
| 888 | err = register_pernet_device(&xfrmi_net_ops); | |
| 889 | if (err < 0) | |
| 890 | goto pernet_dev_failed; | |
| 891 | ||
| 892 | msg = "xfrm4 protocols"; | |
| 893 | err = xfrmi4_init(); | |
| 894 | if (err < 0) | |
| 895 | goto xfrmi4_failed; | |
| 896 | ||
| 897 | msg = "xfrm6 protocols"; | |
| 898 | err = xfrmi6_init(); | |
| 899 | if (err < 0) | |
| 900 | goto xfrmi6_failed; | |
| 901 | ||
| 902 | ||
| 903 | msg = "netlink interface"; | |
| 904 | err = rtnl_link_register(&xfrmi_link_ops); | |
| 905 | if (err < 0) | |
| 906 | goto rtnl_link_failed; | |
| 907 | ||
| 908 | xfrm_if_register_cb(&xfrm_if_cb); | |
| 909 | ||
| 910 | return err; | |
| 911 | ||
| 912 | rtnl_link_failed: | |
| 913 | xfrmi6_fini(); | |
| 914 | xfrmi6_failed: | |
| 915 | xfrmi4_fini(); | |
| 916 | xfrmi4_failed: | |
| 917 | unregister_pernet_device(&xfrmi_net_ops); | |
| 918 | pernet_dev_failed: | |
| 919 | pr_err("xfrmi init: failed to register %s\n", msg); | |
| 920 | return err; | |
| 921 | } | |
| 922 | ||
| 923 | static void __exit xfrmi_fini(void) | |
| 924 | { | |
| 925 | xfrm_if_unregister_cb(); | |
| 926 | rtnl_link_unregister(&xfrmi_link_ops); | |
| 927 | xfrmi4_fini(); | |
| 928 | xfrmi6_fini(); | |
| 929 | unregister_pernet_device(&xfrmi_net_ops); | |
| 930 | } | |
| 931 | ||
| 932 | module_init(xfrmi_init); | |
| 933 | module_exit(xfrmi_fini); | |
| 934 | MODULE_LICENSE("GPL"); | |
| 935 | MODULE_ALIAS_RTNL_LINK("xfrm"); | |
| 936 | MODULE_ALIAS_NETDEV("xfrm0"); | |
| 937 | MODULE_AUTHOR("Steffen Klassert"); | |
| 938 | MODULE_DESCRIPTION("XFRM virtual interface"); |