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 | |
| 136 | static int xfrmi_create2(struct net_device *dev) |
| 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 | |
| 159 | static struct xfrm_if *xfrmi_create(struct net *net, struct xfrm_if_parms *p) |
| 160 | { |
| 161 | struct net_device *dev; |
| 162 | struct xfrm_if *xi; |
| 163 | char name[IFNAMSIZ]; |
| 164 | int err; |
| 165 | |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 166 | if (p->name[0]) { |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 167 | strlcpy(name, p->name, IFNAMSIZ); |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 168 | } else { |
| 169 | err = -EINVAL; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 170 | goto failed; |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 171 | } |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 172 | |
| 173 | dev = alloc_netdev(sizeof(*xi), name, NET_NAME_UNKNOWN, xfrmi_dev_setup); |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 174 | if (!dev) { |
| 175 | err = -EAGAIN; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 176 | goto failed; |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 177 | } |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 178 | |
| 179 | dev_net_set(dev, net); |
| 180 | |
| 181 | xi = netdev_priv(dev); |
| 182 | xi->p = *p; |
| 183 | xi->net = net; |
| 184 | xi->dev = dev; |
| 185 | xi->phydev = dev_get_by_index(net, p->link); |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 186 | if (!xi->phydev) { |
| 187 | err = -ENODEV; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 188 | goto failed_free; |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 189 | } |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 190 | |
| 191 | err = xfrmi_create2(dev); |
| 192 | if (err < 0) |
| 193 | goto failed_dev_put; |
| 194 | |
| 195 | return xi; |
| 196 | |
| 197 | failed_dev_put: |
| 198 | dev_put(xi->phydev); |
| 199 | failed_free: |
| 200 | free_netdev(dev); |
| 201 | failed: |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 202 | return ERR_PTR(err); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p, |
| 206 | int create) |
| 207 | { |
| 208 | struct xfrm_if __rcu **xip; |
| 209 | struct xfrm_if *xi; |
| 210 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| 211 | |
| 212 | for (xip = &xfrmn->xfrmi[0]; |
| 213 | (xi = rtnl_dereference(*xip)) != NULL; |
| 214 | xip = &xi->next) { |
| 215 | if (xi->p.if_id == p->if_id) { |
| 216 | if (create) |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 217 | return ERR_PTR(-EEXIST); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 218 | |
| 219 | return xi; |
| 220 | } |
| 221 | } |
| 222 | if (!create) |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 223 | return ERR_PTR(-ENODEV); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 224 | return xfrmi_create(net, p); |
| 225 | } |
| 226 | |
| 227 | static void xfrmi_dev_uninit(struct net_device *dev) |
| 228 | { |
| 229 | struct xfrm_if *xi = netdev_priv(dev); |
| 230 | struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id); |
| 231 | |
| 232 | xfrmi_unlink(xfrmn, xi); |
| 233 | dev_put(xi->phydev); |
| 234 | dev_put(dev); |
| 235 | } |
| 236 | |
| 237 | static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet) |
| 238 | { |
| 239 | skb->tstamp = 0; |
| 240 | skb->pkt_type = PACKET_HOST; |
| 241 | skb->skb_iif = 0; |
| 242 | skb->ignore_df = 0; |
| 243 | skb_dst_drop(skb); |
| 244 | nf_reset(skb); |
| 245 | nf_reset_trace(skb); |
| 246 | |
| 247 | if (!xnet) |
| 248 | return; |
| 249 | |
| 250 | ipvs_reset(skb); |
| 251 | secpath_reset(skb); |
| 252 | skb_orphan(skb); |
| 253 | skb->mark = 0; |
| 254 | } |
| 255 | |
| 256 | static int xfrmi_rcv_cb(struct sk_buff *skb, int err) |
| 257 | { |
Florian Westphal | 4c145dc | 2019-03-29 21:16:31 +0100 | [diff] [blame] | 258 | const struct xfrm_mode *inner_mode; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 259 | struct pcpu_sw_netstats *tstats; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 260 | struct net_device *dev; |
| 261 | struct xfrm_state *x; |
| 262 | struct xfrm_if *xi; |
| 263 | bool xnet; |
| 264 | |
Florian Westphal | 26912e3 | 2018-12-18 17:15:24 +0100 | [diff] [blame] | 265 | if (err && !secpath_exists(skb)) |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 266 | return 0; |
| 267 | |
| 268 | x = xfrm_input_state(skb); |
| 269 | |
| 270 | xi = xfrmi_lookup(xs_net(x), x); |
| 271 | if (!xi) |
| 272 | return 1; |
| 273 | |
| 274 | dev = xi->dev; |
| 275 | skb->dev = dev; |
| 276 | |
| 277 | if (err) { |
| 278 | dev->stats.rx_errors++; |
| 279 | dev->stats.rx_dropped++; |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | xnet = !net_eq(xi->net, dev_net(skb->dev)); |
| 285 | |
| 286 | if (xnet) { |
Florian Westphal | c9500d7 | 2019-03-29 21:16:32 +0100 | [diff] [blame] | 287 | inner_mode = &x->inner_mode; |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 288 | |
| 289 | if (x->sel.family == AF_UNSPEC) { |
| 290 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); |
| 291 | if (inner_mode == NULL) { |
| 292 | XFRM_INC_STATS(dev_net(skb->dev), |
| 293 | LINUX_MIB_XFRMINSTATEMODEERROR); |
| 294 | return -EINVAL; |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, |
Florian Westphal | b45714b | 2019-03-29 21:16:23 +0100 | [diff] [blame] | 299 | inner_mode->family)) |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 300 | return -EPERM; |
| 301 | } |
| 302 | |
| 303 | xfrmi_scrub_packet(skb, xnet); |
| 304 | |
| 305 | tstats = this_cpu_ptr(dev->tstats); |
| 306 | |
| 307 | u64_stats_update_begin(&tstats->syncp); |
| 308 | tstats->rx_packets++; |
| 309 | tstats->rx_bytes += skb->len; |
| 310 | u64_stats_update_end(&tstats->syncp); |
| 311 | |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | static int |
| 316 | xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) |
| 317 | { |
| 318 | struct xfrm_if *xi = netdev_priv(dev); |
| 319 | struct net_device_stats *stats = &xi->dev->stats; |
| 320 | struct dst_entry *dst = skb_dst(skb); |
| 321 | unsigned int length = skb->len; |
| 322 | struct net_device *tdev; |
| 323 | struct xfrm_state *x; |
| 324 | int err = -1; |
| 325 | int mtu; |
| 326 | |
| 327 | if (!dst) |
| 328 | goto tx_err_link_failure; |
| 329 | |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 330 | dst_hold(dst); |
Benedict Wong | bc56b33 | 2018-07-19 10:50:44 -0700 | [diff] [blame] | 331 | 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] | 332 | if (IS_ERR(dst)) { |
| 333 | err = PTR_ERR(dst); |
| 334 | dst = NULL; |
| 335 | goto tx_err_link_failure; |
| 336 | } |
| 337 | |
| 338 | x = dst->xfrm; |
| 339 | if (!x) |
| 340 | goto tx_err_link_failure; |
| 341 | |
| 342 | if (x->if_id != xi->p.if_id) |
| 343 | goto tx_err_link_failure; |
| 344 | |
| 345 | tdev = dst->dev; |
| 346 | |
| 347 | if (tdev == dev) { |
| 348 | stats->collisions++; |
| 349 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
| 350 | xi->p.name); |
| 351 | goto tx_err_dst_release; |
| 352 | } |
| 353 | |
| 354 | mtu = dst_mtu(dst); |
| 355 | if (!skb->ignore_df && skb->len > mtu) { |
| 356 | skb_dst_update_pmtu(skb, mtu); |
| 357 | |
| 358 | if (skb->protocol == htons(ETH_P_IPV6)) { |
| 359 | if (mtu < IPV6_MIN_MTU) |
| 360 | mtu = IPV6_MIN_MTU; |
| 361 | |
| 362 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
| 363 | } else { |
| 364 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
| 365 | htonl(mtu)); |
| 366 | } |
| 367 | |
| 368 | dst_release(dst); |
| 369 | return -EMSGSIZE; |
| 370 | } |
| 371 | |
| 372 | xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev))); |
| 373 | skb_dst_set(skb, dst); |
| 374 | skb->dev = tdev; |
| 375 | |
| 376 | err = dst_output(xi->net, skb->sk, skb); |
| 377 | if (net_xmit_eval(err) == 0) { |
| 378 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); |
| 379 | |
| 380 | u64_stats_update_begin(&tstats->syncp); |
| 381 | tstats->tx_bytes += length; |
| 382 | tstats->tx_packets++; |
| 383 | u64_stats_update_end(&tstats->syncp); |
| 384 | } else { |
| 385 | stats->tx_errors++; |
| 386 | stats->tx_aborted_errors++; |
| 387 | } |
| 388 | |
| 389 | return 0; |
| 390 | tx_err_link_failure: |
| 391 | stats->tx_carrier_errors++; |
| 392 | dst_link_failure(skb); |
| 393 | tx_err_dst_release: |
| 394 | dst_release(dst); |
| 395 | return err; |
| 396 | } |
| 397 | |
| 398 | static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev) |
| 399 | { |
| 400 | struct xfrm_if *xi = netdev_priv(dev); |
| 401 | struct net_device_stats *stats = &xi->dev->stats; |
| 402 | struct flowi fl; |
| 403 | int ret; |
| 404 | |
| 405 | memset(&fl, 0, sizeof(fl)); |
| 406 | |
| 407 | switch (skb->protocol) { |
| 408 | case htons(ETH_P_IPV6): |
| 409 | xfrm_decode_session(skb, &fl, AF_INET6); |
| 410 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); |
| 411 | break; |
| 412 | case htons(ETH_P_IP): |
| 413 | xfrm_decode_session(skb, &fl, AF_INET); |
| 414 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
| 415 | break; |
| 416 | default: |
| 417 | goto tx_err; |
| 418 | } |
| 419 | |
| 420 | fl.flowi_oif = xi->phydev->ifindex; |
| 421 | |
| 422 | ret = xfrmi_xmit2(skb, dev, &fl); |
| 423 | if (ret < 0) |
| 424 | goto tx_err; |
| 425 | |
| 426 | return NETDEV_TX_OK; |
| 427 | |
| 428 | tx_err: |
| 429 | stats->tx_errors++; |
| 430 | stats->tx_dropped++; |
| 431 | kfree_skb(skb); |
| 432 | return NETDEV_TX_OK; |
| 433 | } |
| 434 | |
| 435 | static int xfrmi4_err(struct sk_buff *skb, u32 info) |
| 436 | { |
| 437 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
| 438 | struct net *net = dev_net(skb->dev); |
| 439 | int protocol = iph->protocol; |
| 440 | struct ip_comp_hdr *ipch; |
| 441 | struct ip_esp_hdr *esph; |
| 442 | struct ip_auth_hdr *ah ; |
| 443 | struct xfrm_state *x; |
| 444 | struct xfrm_if *xi; |
| 445 | __be32 spi; |
| 446 | |
| 447 | switch (protocol) { |
| 448 | case IPPROTO_ESP: |
| 449 | esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); |
| 450 | spi = esph->spi; |
| 451 | break; |
| 452 | case IPPROTO_AH: |
| 453 | ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); |
| 454 | spi = ah->spi; |
| 455 | break; |
| 456 | case IPPROTO_COMP: |
| 457 | ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); |
| 458 | spi = htonl(ntohs(ipch->cpi)); |
| 459 | break; |
| 460 | default: |
| 461 | return 0; |
| 462 | } |
| 463 | |
| 464 | switch (icmp_hdr(skb)->type) { |
| 465 | case ICMP_DEST_UNREACH: |
| 466 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) |
| 467 | return 0; |
| 468 | case ICMP_REDIRECT: |
| 469 | break; |
| 470 | default: |
| 471 | return 0; |
| 472 | } |
| 473 | |
| 474 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
| 475 | spi, protocol, AF_INET); |
| 476 | if (!x) |
| 477 | return 0; |
| 478 | |
| 479 | xi = xfrmi_lookup(net, x); |
| 480 | if (!xi) { |
| 481 | xfrm_state_put(x); |
| 482 | return -1; |
| 483 | } |
| 484 | |
| 485 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) |
Maciej Żenczykowski | d888f39 | 2018-09-25 20:56:26 -0700 | [diff] [blame] | 486 | ipv4_update_pmtu(skb, net, info, 0, protocol); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 487 | else |
Maciej Żenczykowski | 1042caa | 2018-09-25 20:56:27 -0700 | [diff] [blame] | 488 | ipv4_redirect(skb, net, 0, protocol); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 489 | xfrm_state_put(x); |
| 490 | |
| 491 | return 0; |
| 492 | } |
| 493 | |
| 494 | static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| 495 | u8 type, u8 code, int offset, __be32 info) |
| 496 | { |
| 497 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
| 498 | struct net *net = dev_net(skb->dev); |
| 499 | int protocol = iph->nexthdr; |
| 500 | struct ip_comp_hdr *ipch; |
| 501 | struct ip_esp_hdr *esph; |
| 502 | struct ip_auth_hdr *ah; |
| 503 | struct xfrm_state *x; |
| 504 | struct xfrm_if *xi; |
| 505 | __be32 spi; |
| 506 | |
| 507 | switch (protocol) { |
| 508 | case IPPROTO_ESP: |
| 509 | esph = (struct ip_esp_hdr *)(skb->data + offset); |
| 510 | spi = esph->spi; |
| 511 | break; |
| 512 | case IPPROTO_AH: |
| 513 | ah = (struct ip_auth_hdr *)(skb->data + offset); |
| 514 | spi = ah->spi; |
| 515 | break; |
| 516 | case IPPROTO_COMP: |
| 517 | ipch = (struct ip_comp_hdr *)(skb->data + offset); |
| 518 | spi = htonl(ntohs(ipch->cpi)); |
| 519 | break; |
| 520 | default: |
| 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | if (type != ICMPV6_PKT_TOOBIG && |
| 525 | type != NDISC_REDIRECT) |
| 526 | return 0; |
| 527 | |
| 528 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
| 529 | spi, protocol, AF_INET6); |
| 530 | if (!x) |
| 531 | return 0; |
| 532 | |
| 533 | xi = xfrmi_lookup(net, x); |
| 534 | if (!xi) { |
| 535 | xfrm_state_put(x); |
| 536 | return -1; |
| 537 | } |
| 538 | |
| 539 | if (type == NDISC_REDIRECT) |
| 540 | ip6_redirect(skb, net, skb->dev->ifindex, 0, |
| 541 | sock_net_uid(net, NULL)); |
| 542 | else |
| 543 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
| 544 | xfrm_state_put(x); |
| 545 | |
| 546 | return 0; |
| 547 | } |
| 548 | |
| 549 | static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p) |
| 550 | { |
| 551 | if (xi->p.link != p->link) |
| 552 | return -EINVAL; |
| 553 | |
| 554 | xi->p.if_id = p->if_id; |
| 555 | |
| 556 | return 0; |
| 557 | } |
| 558 | |
| 559 | static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p) |
| 560 | { |
| 561 | struct net *net = dev_net(xi->dev); |
| 562 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| 563 | int err; |
| 564 | |
| 565 | xfrmi_unlink(xfrmn, xi); |
| 566 | synchronize_net(); |
| 567 | err = xfrmi_change(xi, p); |
| 568 | xfrmi_link(xfrmn, xi); |
| 569 | netdev_state_change(xi->dev); |
| 570 | return err; |
| 571 | } |
| 572 | |
| 573 | static void xfrmi_get_stats64(struct net_device *dev, |
| 574 | struct rtnl_link_stats64 *s) |
| 575 | { |
| 576 | int cpu; |
| 577 | |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 578 | for_each_possible_cpu(cpu) { |
| 579 | struct pcpu_sw_netstats *stats; |
| 580 | struct pcpu_sw_netstats tmp; |
| 581 | int start; |
| 582 | |
| 583 | stats = per_cpu_ptr(dev->tstats, cpu); |
| 584 | do { |
| 585 | start = u64_stats_fetch_begin_irq(&stats->syncp); |
| 586 | tmp.rx_packets = stats->rx_packets; |
| 587 | tmp.rx_bytes = stats->rx_bytes; |
| 588 | tmp.tx_packets = stats->tx_packets; |
| 589 | tmp.tx_bytes = stats->tx_bytes; |
| 590 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
| 591 | |
| 592 | s->rx_packets += tmp.rx_packets; |
| 593 | s->rx_bytes += tmp.rx_bytes; |
| 594 | s->tx_packets += tmp.tx_packets; |
| 595 | s->tx_bytes += tmp.tx_bytes; |
| 596 | } |
| 597 | |
| 598 | s->rx_dropped = dev->stats.rx_dropped; |
| 599 | s->tx_dropped = dev->stats.tx_dropped; |
| 600 | } |
| 601 | |
| 602 | static int xfrmi_get_iflink(const struct net_device *dev) |
| 603 | { |
| 604 | struct xfrm_if *xi = netdev_priv(dev); |
| 605 | |
| 606 | return xi->phydev->ifindex; |
| 607 | } |
| 608 | |
| 609 | |
| 610 | static const struct net_device_ops xfrmi_netdev_ops = { |
| 611 | .ndo_init = xfrmi_dev_init, |
| 612 | .ndo_uninit = xfrmi_dev_uninit, |
| 613 | .ndo_start_xmit = xfrmi_xmit, |
| 614 | .ndo_get_stats64 = xfrmi_get_stats64, |
| 615 | .ndo_get_iflink = xfrmi_get_iflink, |
| 616 | }; |
| 617 | |
| 618 | static void xfrmi_dev_setup(struct net_device *dev) |
| 619 | { |
| 620 | dev->netdev_ops = &xfrmi_netdev_ops; |
| 621 | dev->type = ARPHRD_NONE; |
| 622 | dev->hard_header_len = ETH_HLEN; |
| 623 | dev->min_header_len = ETH_HLEN; |
| 624 | dev->mtu = ETH_DATA_LEN; |
| 625 | dev->min_mtu = ETH_MIN_MTU; |
| 626 | dev->max_mtu = ETH_DATA_LEN; |
| 627 | dev->addr_len = ETH_ALEN; |
| 628 | dev->flags = IFF_NOARP; |
| 629 | dev->needs_free_netdev = true; |
| 630 | dev->priv_destructor = xfrmi_dev_free; |
| 631 | netif_keep_dst(dev); |
| 632 | } |
| 633 | |
| 634 | static int xfrmi_dev_init(struct net_device *dev) |
| 635 | { |
| 636 | struct xfrm_if *xi = netdev_priv(dev); |
| 637 | struct net_device *phydev = xi->phydev; |
| 638 | int err; |
| 639 | |
| 640 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| 641 | if (!dev->tstats) |
| 642 | return -ENOMEM; |
| 643 | |
| 644 | err = gro_cells_init(&xi->gro_cells, dev); |
| 645 | if (err) { |
| 646 | free_percpu(dev->tstats); |
| 647 | return err; |
| 648 | } |
| 649 | |
| 650 | dev->features |= NETIF_F_LLTX; |
| 651 | |
| 652 | dev->needed_headroom = phydev->needed_headroom; |
| 653 | dev->needed_tailroom = phydev->needed_tailroom; |
| 654 | |
| 655 | if (is_zero_ether_addr(dev->dev_addr)) |
| 656 | eth_hw_addr_inherit(dev, phydev); |
| 657 | if (is_zero_ether_addr(dev->broadcast)) |
| 658 | memcpy(dev->broadcast, phydev->broadcast, dev->addr_len); |
| 659 | |
| 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[], |
| 664 | struct netlink_ext_ack *extack) |
| 665 | { |
| 666 | return 0; |
| 667 | } |
| 668 | |
| 669 | static void xfrmi_netlink_parms(struct nlattr *data[], |
| 670 | struct xfrm_if_parms *parms) |
| 671 | { |
| 672 | memset(parms, 0, sizeof(*parms)); |
| 673 | |
| 674 | if (!data) |
| 675 | return; |
| 676 | |
| 677 | if (data[IFLA_XFRM_LINK]) |
| 678 | parms->link = nla_get_u32(data[IFLA_XFRM_LINK]); |
| 679 | |
| 680 | if (data[IFLA_XFRM_IF_ID]) |
| 681 | parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]); |
| 682 | } |
| 683 | |
| 684 | static int xfrmi_newlink(struct net *src_net, struct net_device *dev, |
| 685 | struct nlattr *tb[], struct nlattr *data[], |
| 686 | struct netlink_ext_ack *extack) |
| 687 | { |
| 688 | struct net *net = dev_net(dev); |
| 689 | struct xfrm_if_parms *p; |
| 690 | struct xfrm_if *xi; |
| 691 | |
| 692 | xi = netdev_priv(dev); |
| 693 | p = &xi->p; |
| 694 | |
| 695 | xfrmi_netlink_parms(data, p); |
| 696 | |
| 697 | if (!tb[IFLA_IFNAME]) |
| 698 | return -EINVAL; |
| 699 | |
| 700 | nla_strlcpy(p->name, tb[IFLA_IFNAME], IFNAMSIZ); |
| 701 | |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 702 | xi = xfrmi_locate(net, p, 1); |
kbuild test robot | c6f5e01 | 2018-07-26 15:09:52 +0800 | [diff] [blame] | 703 | return PTR_ERR_OR_ZERO(xi); |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | static void xfrmi_dellink(struct net_device *dev, struct list_head *head) |
| 707 | { |
| 708 | unregister_netdevice_queue(dev, head); |
| 709 | } |
| 710 | |
| 711 | static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], |
| 712 | struct nlattr *data[], |
| 713 | struct netlink_ext_ack *extack) |
| 714 | { |
| 715 | struct xfrm_if *xi = netdev_priv(dev); |
| 716 | struct net *net = dev_net(dev); |
| 717 | |
| 718 | xfrmi_netlink_parms(data, &xi->p); |
| 719 | |
| 720 | xi = xfrmi_locate(net, &xi->p, 0); |
| 721 | |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 722 | if (IS_ERR_OR_NULL(xi)) { |
| 723 | xi = netdev_priv(dev); |
| 724 | } else { |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 725 | if (xi->dev != dev) |
| 726 | return -EEXIST; |
Benedict Wong | 44e2b83 | 2018-07-25 13:45:29 -0700 | [diff] [blame] | 727 | } |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 728 | |
| 729 | return xfrmi_update(xi, &xi->p); |
| 730 | } |
| 731 | |
| 732 | static size_t xfrmi_get_size(const struct net_device *dev) |
| 733 | { |
| 734 | return |
| 735 | /* IFLA_XFRM_LINK */ |
| 736 | nla_total_size(4) + |
| 737 | /* IFLA_XFRM_IF_ID */ |
| 738 | nla_total_size(4) + |
| 739 | 0; |
| 740 | } |
| 741 | |
| 742 | static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 743 | { |
| 744 | struct xfrm_if *xi = netdev_priv(dev); |
| 745 | struct xfrm_if_parms *parm = &xi->p; |
| 746 | |
| 747 | if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) || |
| 748 | nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id)) |
| 749 | goto nla_put_failure; |
| 750 | return 0; |
| 751 | |
| 752 | nla_put_failure: |
| 753 | return -EMSGSIZE; |
| 754 | } |
| 755 | |
Wei Yongjun | 211d6f2 | 2018-07-28 06:49:48 +0000 | [diff] [blame] | 756 | static struct net *xfrmi_get_link_net(const struct net_device *dev) |
Steffen Klassert | f203b76 | 2018-06-12 14:07:12 +0200 | [diff] [blame] | 757 | { |
| 758 | struct xfrm_if *xi = netdev_priv(dev); |
| 759 | |
| 760 | return dev_net(xi->phydev); |
| 761 | } |
| 762 | |
| 763 | static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = { |
| 764 | [IFLA_XFRM_LINK] = { .type = NLA_U32 }, |
| 765 | [IFLA_XFRM_IF_ID] = { .type = NLA_U32 }, |
| 766 | }; |
| 767 | |
| 768 | static struct rtnl_link_ops xfrmi_link_ops __read_mostly = { |
| 769 | .kind = "xfrm", |
| 770 | .maxtype = IFLA_XFRM_MAX, |
| 771 | .policy = xfrmi_policy, |
| 772 | .priv_size = sizeof(struct xfrm_if), |
| 773 | .setup = xfrmi_dev_setup, |
| 774 | .validate = xfrmi_validate, |
| 775 | .newlink = xfrmi_newlink, |
| 776 | .dellink = xfrmi_dellink, |
| 777 | .changelink = xfrmi_changelink, |
| 778 | .get_size = xfrmi_get_size, |
| 779 | .fill_info = xfrmi_fill_info, |
| 780 | .get_link_net = xfrmi_get_link_net, |
| 781 | }; |
| 782 | |
| 783 | static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn) |
| 784 | { |
| 785 | struct xfrm_if *xi; |
| 786 | LIST_HEAD(list); |
| 787 | |
| 788 | xi = rtnl_dereference(xfrmn->xfrmi[0]); |
| 789 | if (!xi) |
| 790 | return; |
| 791 | |
| 792 | unregister_netdevice_queue(xi->dev, &list); |
| 793 | unregister_netdevice_many(&list); |
| 794 | } |
| 795 | |
| 796 | static int __net_init xfrmi_init_net(struct net *net) |
| 797 | { |
| 798 | return 0; |
| 799 | } |
| 800 | |
| 801 | static void __net_exit xfrmi_exit_net(struct net *net) |
| 802 | { |
| 803 | struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| 804 | |
| 805 | rtnl_lock(); |
| 806 | xfrmi_destroy_interfaces(xfrmn); |
| 807 | rtnl_unlock(); |
| 808 | } |
| 809 | |
| 810 | static struct pernet_operations xfrmi_net_ops = { |
| 811 | .init = xfrmi_init_net, |
| 812 | .exit = xfrmi_exit_net, |
| 813 | .id = &xfrmi_net_id, |
| 814 | .size = sizeof(struct xfrmi_net), |
| 815 | }; |
| 816 | |
| 817 | static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = { |
| 818 | .handler = xfrm6_rcv, |
| 819 | .cb_handler = xfrmi_rcv_cb, |
| 820 | .err_handler = xfrmi6_err, |
| 821 | .priority = 10, |
| 822 | }; |
| 823 | |
| 824 | static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = { |
| 825 | .handler = xfrm6_rcv, |
| 826 | .cb_handler = xfrmi_rcv_cb, |
| 827 | .err_handler = xfrmi6_err, |
| 828 | .priority = 10, |
| 829 | }; |
| 830 | |
| 831 | static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = { |
| 832 | .handler = xfrm6_rcv, |
| 833 | .cb_handler = xfrmi_rcv_cb, |
| 834 | .err_handler = xfrmi6_err, |
| 835 | .priority = 10, |
| 836 | }; |
| 837 | |
| 838 | static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = { |
| 839 | .handler = xfrm4_rcv, |
| 840 | .input_handler = xfrm_input, |
| 841 | .cb_handler = xfrmi_rcv_cb, |
| 842 | .err_handler = xfrmi4_err, |
| 843 | .priority = 10, |
| 844 | }; |
| 845 | |
| 846 | static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = { |
| 847 | .handler = xfrm4_rcv, |
| 848 | .input_handler = xfrm_input, |
| 849 | .cb_handler = xfrmi_rcv_cb, |
| 850 | .err_handler = xfrmi4_err, |
| 851 | .priority = 10, |
| 852 | }; |
| 853 | |
| 854 | static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = { |
| 855 | .handler = xfrm4_rcv, |
| 856 | .input_handler = xfrm_input, |
| 857 | .cb_handler = xfrmi_rcv_cb, |
| 858 | .err_handler = xfrmi4_err, |
| 859 | .priority = 10, |
| 860 | }; |
| 861 | |
| 862 | static int __init xfrmi4_init(void) |
| 863 | { |
| 864 | int err; |
| 865 | |
| 866 | err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP); |
| 867 | if (err < 0) |
| 868 | goto xfrm_proto_esp_failed; |
| 869 | err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH); |
| 870 | if (err < 0) |
| 871 | goto xfrm_proto_ah_failed; |
| 872 | err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); |
| 873 | if (err < 0) |
| 874 | goto xfrm_proto_comp_failed; |
| 875 | |
| 876 | return 0; |
| 877 | |
| 878 | xfrm_proto_comp_failed: |
| 879 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); |
| 880 | xfrm_proto_ah_failed: |
| 881 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); |
| 882 | xfrm_proto_esp_failed: |
| 883 | return err; |
| 884 | } |
| 885 | |
| 886 | static void xfrmi4_fini(void) |
| 887 | { |
| 888 | xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); |
| 889 | xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); |
| 890 | xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); |
| 891 | } |
| 892 | |
| 893 | static int __init xfrmi6_init(void) |
| 894 | { |
| 895 | int err; |
| 896 | |
| 897 | err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP); |
| 898 | if (err < 0) |
| 899 | goto xfrm_proto_esp_failed; |
| 900 | err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH); |
| 901 | if (err < 0) |
| 902 | goto xfrm_proto_ah_failed; |
| 903 | err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); |
| 904 | if (err < 0) |
| 905 | goto xfrm_proto_comp_failed; |
| 906 | |
| 907 | return 0; |
| 908 | |
| 909 | xfrm_proto_comp_failed: |
| 910 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); |
| 911 | xfrm_proto_ah_failed: |
| 912 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); |
| 913 | xfrm_proto_esp_failed: |
| 914 | return err; |
| 915 | } |
| 916 | |
| 917 | static void xfrmi6_fini(void) |
| 918 | { |
| 919 | xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); |
| 920 | xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); |
| 921 | xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); |
| 922 | } |
| 923 | |
| 924 | static const struct xfrm_if_cb xfrm_if_cb = { |
| 925 | .decode_session = xfrmi_decode_session, |
| 926 | }; |
| 927 | |
| 928 | static int __init xfrmi_init(void) |
| 929 | { |
| 930 | const char *msg; |
| 931 | int err; |
| 932 | |
| 933 | pr_info("IPsec XFRM device driver\n"); |
| 934 | |
| 935 | msg = "tunnel device"; |
| 936 | err = register_pernet_device(&xfrmi_net_ops); |
| 937 | if (err < 0) |
| 938 | goto pernet_dev_failed; |
| 939 | |
| 940 | msg = "xfrm4 protocols"; |
| 941 | err = xfrmi4_init(); |
| 942 | if (err < 0) |
| 943 | goto xfrmi4_failed; |
| 944 | |
| 945 | msg = "xfrm6 protocols"; |
| 946 | err = xfrmi6_init(); |
| 947 | if (err < 0) |
| 948 | goto xfrmi6_failed; |
| 949 | |
| 950 | |
| 951 | msg = "netlink interface"; |
| 952 | err = rtnl_link_register(&xfrmi_link_ops); |
| 953 | if (err < 0) |
| 954 | goto rtnl_link_failed; |
| 955 | |
| 956 | xfrm_if_register_cb(&xfrm_if_cb); |
| 957 | |
| 958 | return err; |
| 959 | |
| 960 | rtnl_link_failed: |
| 961 | xfrmi6_fini(); |
| 962 | xfrmi6_failed: |
| 963 | xfrmi4_fini(); |
| 964 | xfrmi4_failed: |
| 965 | unregister_pernet_device(&xfrmi_net_ops); |
| 966 | pernet_dev_failed: |
| 967 | pr_err("xfrmi init: failed to register %s\n", msg); |
| 968 | return err; |
| 969 | } |
| 970 | |
| 971 | static void __exit xfrmi_fini(void) |
| 972 | { |
| 973 | xfrm_if_unregister_cb(); |
| 974 | rtnl_link_unregister(&xfrmi_link_ops); |
| 975 | xfrmi4_fini(); |
| 976 | xfrmi6_fini(); |
| 977 | unregister_pernet_device(&xfrmi_net_ops); |
| 978 | } |
| 979 | |
| 980 | module_init(xfrmi_init); |
| 981 | module_exit(xfrmi_fini); |
| 982 | MODULE_LICENSE("GPL"); |
| 983 | MODULE_ALIAS_RTNL_LINK("xfrm"); |
| 984 | MODULE_ALIAS_NETDEV("xfrm0"); |
| 985 | MODULE_AUTHOR("Steffen Klassert"); |
| 986 | MODULE_DESCRIPTION("XFRM virtual interface"); |