| | 1 | /* |
| | 2 | * L2TP netlink layer, for management |
| | 3 | * |
| | 4 | * Copyright (c) 2008,2009,2010 Katalix Systems Ltd |
| | 5 | * |
| | 6 | * Partly based on the IrDA nelink implementation |
| | 7 | * (see net/irda/irnetlink.c) which is: |
| | 8 | * Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org> |
| | 9 | * which is in turn partly based on the wireless netlink code: |
| | 10 | * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> |
| | 11 | * |
| | 12 | * This program is free software; you can redistribute it and/or modify |
| | 13 | * it under the terms of the GNU General Public License version 2 as |
| | 14 | * published by the Free Software Foundation. |
| | 15 | */ |
| | 16 | |
| | 17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| | 18 | |
| | 19 | #include <net/sock.h> |
| | 20 | #include <net/genetlink.h> |
| | 21 | #include <net/udp.h> |
| | 22 | #include <linux/in.h> |
| | 23 | #include <linux/udp.h> |
| | 24 | #include <linux/socket.h> |
| | 25 | #include <linux/module.h> |
| | 26 | #include <linux/list.h> |
| | 27 | #include <net/net_namespace.h> |
| | 28 | |
| | 29 | #include <linux/l2tp.h> |
| | 30 | |
| | 31 | #include "l2tp_core.h" |
| | 32 | |
| | 33 | |
| | 34 | static struct genl_family l2tp_nl_family; |
| | 35 | |
| | 36 | static const struct genl_multicast_group l2tp_multicast_group[] = { |
| | 37 | { |
| | 38 | .name = L2TP_GENL_MCGROUP, |
| | 39 | }, |
| | 40 | }; |
| | 41 | |
| | 42 | static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, |
| | 43 | int flags, struct l2tp_tunnel *tunnel, u8 cmd); |
| | 44 | static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, |
| | 45 | int flags, struct l2tp_session *session, |
| | 46 | u8 cmd); |
| | 47 | |
| | 48 | /* Accessed under genl lock */ |
| | 49 | static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX]; |
| | 50 | |
| | 51 | static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info) |
| | 52 | { |
| | 53 | u32 tunnel_id; |
| | 54 | u32 session_id; |
| | 55 | char *ifname; |
| | 56 | struct l2tp_tunnel *tunnel; |
| | 57 | struct l2tp_session *session = NULL; |
| | 58 | struct net *net = genl_info_net(info); |
| | 59 | |
| | 60 | if (info->attrs[L2TP_ATTR_IFNAME]) { |
| | 61 | ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); |
| | 62 | session = l2tp_session_get_by_ifname(net, ifname); |
| | 63 | } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) && |
| | 64 | (info->attrs[L2TP_ATTR_CONN_ID])) { |
| | 65 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| | 66 | session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); |
| | 67 | tunnel = l2tp_tunnel_get(net, tunnel_id); |
| | 68 | if (tunnel) { |
| | 69 | session = l2tp_session_get(net, tunnel, session_id); |
| | 70 | l2tp_tunnel_dec_refcount(tunnel); |
| | 71 | } |
| | 72 | } |
| | 73 | |
| | 74 | return session; |
| | 75 | } |
| | 76 | |
| | 77 | static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info) |
| | 78 | { |
| | 79 | struct sk_buff *msg; |
| | 80 | void *hdr; |
| | 81 | int ret = -ENOBUFS; |
| | 82 | |
| | 83 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| | 84 | if (!msg) { |
| | 85 | ret = -ENOMEM; |
| | 86 | goto out; |
| | 87 | } |
| | 88 | |
| | 89 | hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, |
| | 90 | &l2tp_nl_family, 0, L2TP_CMD_NOOP); |
| | 91 | if (!hdr) { |
| | 92 | ret = -EMSGSIZE; |
| | 93 | goto err_out; |
| | 94 | } |
| | 95 | |
| | 96 | genlmsg_end(msg, hdr); |
| | 97 | |
| | 98 | return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid); |
| | 99 | |
| | 100 | err_out: |
| | 101 | nlmsg_free(msg); |
| | 102 | |
| | 103 | out: |
| | 104 | return ret; |
| | 105 | } |
| | 106 | |
| | 107 | static int l2tp_tunnel_notify(struct genl_family *family, |
| | 108 | struct genl_info *info, |
| | 109 | struct l2tp_tunnel *tunnel, |
| | 110 | u8 cmd) |
| | 111 | { |
| | 112 | struct sk_buff *msg; |
| | 113 | int ret; |
| | 114 | |
| | 115 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| | 116 | if (!msg) |
| | 117 | return -ENOMEM; |
| | 118 | |
| | 119 | ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq, |
| | 120 | NLM_F_ACK, tunnel, cmd); |
| | 121 | |
| | 122 | if (ret >= 0) { |
| | 123 | ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC); |
| | 124 | /* We don't care if no one is listening */ |
| | 125 | if (ret == -ESRCH) |
| | 126 | ret = 0; |
| | 127 | return ret; |
| | 128 | } |
| | 129 | |
| | 130 | nlmsg_free(msg); |
| | 131 | |
| | 132 | return ret; |
| | 133 | } |
| | 134 | |
| | 135 | static int l2tp_session_notify(struct genl_family *family, |
| | 136 | struct genl_info *info, |
| | 137 | struct l2tp_session *session, |
| | 138 | u8 cmd) |
| | 139 | { |
| | 140 | struct sk_buff *msg; |
| | 141 | int ret; |
| | 142 | |
| | 143 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| | 144 | if (!msg) |
| | 145 | return -ENOMEM; |
| | 146 | |
| | 147 | ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq, |
| | 148 | NLM_F_ACK, session, cmd); |
| | 149 | |
| | 150 | if (ret >= 0) { |
| | 151 | ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC); |
| | 152 | /* We don't care if no one is listening */ |
| | 153 | if (ret == -ESRCH) |
| | 154 | ret = 0; |
| | 155 | return ret; |
| | 156 | } |
| | 157 | |
| | 158 | nlmsg_free(msg); |
| | 159 | |
| | 160 | return ret; |
| | 161 | } |
| | 162 | |
| | 163 | static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info) |
| | 164 | { |
| | 165 | u32 tunnel_id; |
| | 166 | u32 peer_tunnel_id; |
| | 167 | int proto_version; |
| | 168 | int fd; |
| | 169 | int ret = 0; |
| | 170 | struct l2tp_tunnel_cfg cfg = { 0, }; |
| | 171 | struct l2tp_tunnel *tunnel; |
| | 172 | struct net *net = genl_info_net(info); |
| | 173 | |
| | 174 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { |
| | 175 | ret = -EINVAL; |
| | 176 | goto out; |
| | 177 | } |
| | 178 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| | 179 | |
| | 180 | if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) { |
| | 181 | ret = -EINVAL; |
| | 182 | goto out; |
| | 183 | } |
| | 184 | peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]); |
| | 185 | |
| | 186 | if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) { |
| | 187 | ret = -EINVAL; |
| | 188 | goto out; |
| | 189 | } |
| | 190 | proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]); |
| | 191 | |
| | 192 | if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) { |
| | 193 | ret = -EINVAL; |
| | 194 | goto out; |
| | 195 | } |
| | 196 | cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]); |
| | 197 | |
| | 198 | fd = -1; |
| | 199 | if (info->attrs[L2TP_ATTR_FD]) { |
| | 200 | fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]); |
| | 201 | } else { |
| | 202 | #if IS_ENABLED(CONFIG_IPV6) |
| | 203 | if (info->attrs[L2TP_ATTR_IP6_SADDR] && |
| | 204 | info->attrs[L2TP_ATTR_IP6_DADDR]) { |
| | 205 | cfg.local_ip6 = nla_data( |
| | 206 | info->attrs[L2TP_ATTR_IP6_SADDR]); |
| | 207 | cfg.peer_ip6 = nla_data( |
| | 208 | info->attrs[L2TP_ATTR_IP6_DADDR]); |
| | 209 | } else |
| | 210 | #endif |
| | 211 | if (info->attrs[L2TP_ATTR_IP_SADDR] && |
| | 212 | info->attrs[L2TP_ATTR_IP_DADDR]) { |
| | 213 | cfg.local_ip.s_addr = nla_get_in_addr( |
| | 214 | info->attrs[L2TP_ATTR_IP_SADDR]); |
| | 215 | cfg.peer_ip.s_addr = nla_get_in_addr( |
| | 216 | info->attrs[L2TP_ATTR_IP_DADDR]); |
| | 217 | } else { |
| | 218 | ret = -EINVAL; |
| | 219 | goto out; |
| | 220 | } |
| | 221 | if (info->attrs[L2TP_ATTR_UDP_SPORT]) |
| | 222 | cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]); |
| | 223 | if (info->attrs[L2TP_ATTR_UDP_DPORT]) |
| | 224 | cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]); |
| | 225 | cfg.use_udp_checksums = nla_get_flag( |
| | 226 | info->attrs[L2TP_ATTR_UDP_CSUM]); |
| | 227 | |
| | 228 | #if IS_ENABLED(CONFIG_IPV6) |
| | 229 | cfg.udp6_zero_tx_checksums = nla_get_flag( |
| | 230 | info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]); |
| | 231 | cfg.udp6_zero_rx_checksums = nla_get_flag( |
| | 232 | info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]); |
| | 233 | #endif |
| | 234 | } |
| | 235 | |
| | 236 | if (info->attrs[L2TP_ATTR_DEBUG]) |
| | 237 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); |
| | 238 | |
| | 239 | ret = -EINVAL; |
| | 240 | switch (cfg.encap) { |
| | 241 | case L2TP_ENCAPTYPE_UDP: |
| | 242 | case L2TP_ENCAPTYPE_IP: |
| | 243 | ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id, |
| | 244 | peer_tunnel_id, &cfg, &tunnel); |
| | 245 | break; |
| | 246 | } |
| | 247 | |
| | 248 | if (ret < 0) |
| | 249 | goto out; |
| | 250 | |
| | 251 | l2tp_tunnel_inc_refcount(tunnel); |
| | 252 | ret = l2tp_tunnel_register(tunnel, net, &cfg); |
| | 253 | if (ret < 0) { |
| | 254 | kfree(tunnel); |
| | 255 | goto out; |
| | 256 | } |
| | 257 | ret = l2tp_tunnel_notify(&l2tp_nl_family, info, tunnel, |
| | 258 | L2TP_CMD_TUNNEL_CREATE); |
| | 259 | l2tp_tunnel_dec_refcount(tunnel); |
| | 260 | |
| | 261 | out: |
| | 262 | return ret; |
| | 263 | } |
| | 264 | |
| | 265 | static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info) |
| | 266 | { |
| | 267 | struct l2tp_tunnel *tunnel; |
| | 268 | u32 tunnel_id; |
| | 269 | int ret = 0; |
| | 270 | struct net *net = genl_info_net(info); |
| | 271 | |
| | 272 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { |
| | 273 | ret = -EINVAL; |
| | 274 | goto out; |
| | 275 | } |
| | 276 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| | 277 | |
| | 278 | tunnel = l2tp_tunnel_get(net, tunnel_id); |
| | 279 | if (!tunnel) { |
| | 280 | ret = -ENODEV; |
| | 281 | goto out; |
| | 282 | } |
| | 283 | |
| | 284 | l2tp_tunnel_notify(&l2tp_nl_family, info, |
| | 285 | tunnel, L2TP_CMD_TUNNEL_DELETE); |
| | 286 | |
| | 287 | l2tp_tunnel_delete(tunnel); |
| | 288 | |
| | 289 | l2tp_tunnel_dec_refcount(tunnel); |
| | 290 | |
| | 291 | out: |
| | 292 | return ret; |
| | 293 | } |
| | 294 | |
| | 295 | static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info) |
| | 296 | { |
| | 297 | struct l2tp_tunnel *tunnel; |
| | 298 | u32 tunnel_id; |
| | 299 | int ret = 0; |
| | 300 | struct net *net = genl_info_net(info); |
| | 301 | |
| | 302 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { |
| | 303 | ret = -EINVAL; |
| | 304 | goto out; |
| | 305 | } |
| | 306 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| | 307 | |
| | 308 | tunnel = l2tp_tunnel_get(net, tunnel_id); |
| | 309 | if (!tunnel) { |
| | 310 | ret = -ENODEV; |
| | 311 | goto out; |
| | 312 | } |
| | 313 | |
| | 314 | if (info->attrs[L2TP_ATTR_DEBUG]) |
| | 315 | tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); |
| | 316 | |
| | 317 | ret = l2tp_tunnel_notify(&l2tp_nl_family, info, |
| | 318 | tunnel, L2TP_CMD_TUNNEL_MODIFY); |
| | 319 | |
| | 320 | l2tp_tunnel_dec_refcount(tunnel); |
| | 321 | |
| | 322 | out: |
| | 323 | return ret; |
| | 324 | } |
| | 325 | |
| | 326 | static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags, |
| | 327 | struct l2tp_tunnel *tunnel, u8 cmd) |
| | 328 | { |
| | 329 | void *hdr; |
| | 330 | struct nlattr *nest; |
| | 331 | struct sock *sk = NULL; |
| | 332 | struct inet_sock *inet; |
| | 333 | #if IS_ENABLED(CONFIG_IPV6) |
| | 334 | struct ipv6_pinfo *np = NULL; |
| | 335 | #endif |
| | 336 | |
| | 337 | hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd); |
| | 338 | if (!hdr) |
| | 339 | return -EMSGSIZE; |
| | 340 | |
| | 341 | if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) || |
| | 342 | nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || |
| | 343 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || |
| | 344 | nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) || |
| | 345 | nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap)) |
| | 346 | goto nla_put_failure; |
| | 347 | |
| | 348 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); |
| | 349 | if (nest == NULL) |
| | 350 | goto nla_put_failure; |
| | 351 | |
| | 352 | if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS, |
| | 353 | atomic_long_read(&tunnel->stats.tx_packets), |
| | 354 | L2TP_ATTR_STATS_PAD) || |
| | 355 | nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES, |
| | 356 | atomic_long_read(&tunnel->stats.tx_bytes), |
| | 357 | L2TP_ATTR_STATS_PAD) || |
| | 358 | nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS, |
| | 359 | atomic_long_read(&tunnel->stats.tx_errors), |
| | 360 | L2TP_ATTR_STATS_PAD) || |
| | 361 | nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS, |
| | 362 | atomic_long_read(&tunnel->stats.rx_packets), |
| | 363 | L2TP_ATTR_STATS_PAD) || |
| | 364 | nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES, |
| | 365 | atomic_long_read(&tunnel->stats.rx_bytes), |
| | 366 | L2TP_ATTR_STATS_PAD) || |
| | 367 | nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS, |
| | 368 | atomic_long_read(&tunnel->stats.rx_seq_discards), |
| | 369 | L2TP_ATTR_STATS_PAD) || |
| | 370 | nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS, |
| | 371 | atomic_long_read(&tunnel->stats.rx_oos_packets), |
| | 372 | L2TP_ATTR_STATS_PAD) || |
| | 373 | nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS, |
| | 374 | atomic_long_read(&tunnel->stats.rx_errors), |
| | 375 | L2TP_ATTR_STATS_PAD)) |
| | 376 | goto nla_put_failure; |
| | 377 | nla_nest_end(skb, nest); |
| | 378 | |
| | 379 | sk = tunnel->sock; |
| | 380 | if (!sk) |
| | 381 | goto out; |
| | 382 | |
| | 383 | #if IS_ENABLED(CONFIG_IPV6) |
| | 384 | if (sk->sk_family == AF_INET6) |
| | 385 | np = inet6_sk(sk); |
| | 386 | #endif |
| | 387 | |
| | 388 | inet = inet_sk(sk); |
| | 389 | |
| | 390 | switch (tunnel->encap) { |
| | 391 | case L2TP_ENCAPTYPE_UDP: |
| | 392 | switch (sk->sk_family) { |
| | 393 | case AF_INET: |
| | 394 | if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx)) |
| | 395 | goto nla_put_failure; |
| | 396 | break; |
| | 397 | #if IS_ENABLED(CONFIG_IPV6) |
| | 398 | case AF_INET6: |
| | 399 | if (udp_get_no_check6_tx(sk) && |
| | 400 | nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX)) |
| | 401 | goto nla_put_failure; |
| | 402 | if (udp_get_no_check6_rx(sk) && |
| | 403 | nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX)) |
| | 404 | goto nla_put_failure; |
| | 405 | break; |
| | 406 | #endif |
| | 407 | } |
| | 408 | if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) || |
| | 409 | nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport))) |
| | 410 | goto nla_put_failure; |
| | 411 | /* fall through */ |
| | 412 | case L2TP_ENCAPTYPE_IP: |
| | 413 | #if IS_ENABLED(CONFIG_IPV6) |
| | 414 | if (np) { |
| | 415 | if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR, |
| | 416 | &np->saddr) || |
| | 417 | nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR, |
| | 418 | &sk->sk_v6_daddr)) |
| | 419 | goto nla_put_failure; |
| | 420 | } else |
| | 421 | #endif |
| | 422 | if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR, |
| | 423 | inet->inet_saddr) || |
| | 424 | nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR, |
| | 425 | inet->inet_daddr)) |
| | 426 | goto nla_put_failure; |
| | 427 | break; |
| | 428 | } |
| | 429 | |
| | 430 | out: |
| | 431 | genlmsg_end(skb, hdr); |
| | 432 | return 0; |
| | 433 | |
| | 434 | nla_put_failure: |
| | 435 | genlmsg_cancel(skb, hdr); |
| | 436 | return -1; |
| | 437 | } |
| | 438 | |
| | 439 | static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info) |
| | 440 | { |
| | 441 | struct l2tp_tunnel *tunnel; |
| | 442 | struct sk_buff *msg; |
| | 443 | u32 tunnel_id; |
| | 444 | int ret = -ENOBUFS; |
| | 445 | struct net *net = genl_info_net(info); |
| | 446 | |
| | 447 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { |
| | 448 | ret = -EINVAL; |
| | 449 | goto err; |
| | 450 | } |
| | 451 | |
| | 452 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| | 453 | |
| | 454 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| | 455 | if (!msg) { |
| | 456 | ret = -ENOMEM; |
| | 457 | goto err; |
| | 458 | } |
| | 459 | |
| | 460 | tunnel = l2tp_tunnel_get(net, tunnel_id); |
| | 461 | if (!tunnel) { |
| | 462 | ret = -ENODEV; |
| | 463 | goto err_nlmsg; |
| | 464 | } |
| | 465 | |
| | 466 | ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq, |
| | 467 | NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET); |
| | 468 | if (ret < 0) |
| | 469 | goto err_nlmsg_tunnel; |
| | 470 | |
| | 471 | l2tp_tunnel_dec_refcount(tunnel); |
| | 472 | |
| | 473 | return genlmsg_unicast(net, msg, info->snd_portid); |
| | 474 | |
| | 475 | err_nlmsg_tunnel: |
| | 476 | l2tp_tunnel_dec_refcount(tunnel); |
| | 477 | err_nlmsg: |
| | 478 | nlmsg_free(msg); |
| | 479 | err: |
| | 480 | return ret; |
| | 481 | } |
| | 482 | |
| | 483 | static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| | 484 | { |
| | 485 | int ti = cb->args[0]; |
| | 486 | struct l2tp_tunnel *tunnel; |
| | 487 | struct net *net = sock_net(skb->sk); |
| | 488 | |
| | 489 | for (;;) { |
| | 490 | tunnel = l2tp_tunnel_get_nth(net, ti); |
| | 491 | if (tunnel == NULL) |
| | 492 | goto out; |
| | 493 | |
| | 494 | if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid, |
| | 495 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| | 496 | tunnel, L2TP_CMD_TUNNEL_GET) < 0) { |
| | 497 | l2tp_tunnel_dec_refcount(tunnel); |
| | 498 | goto out; |
| | 499 | } |
| | 500 | l2tp_tunnel_dec_refcount(tunnel); |
| | 501 | |
| | 502 | ti++; |
| | 503 | } |
| | 504 | |
| | 505 | out: |
| | 506 | cb->args[0] = ti; |
| | 507 | |
| | 508 | return skb->len; |
| | 509 | } |
| | 510 | |
| | 511 | static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info) |
| | 512 | { |
| | 513 | u32 tunnel_id = 0; |
| | 514 | u32 session_id; |
| | 515 | u32 peer_session_id; |
| | 516 | int ret = 0; |
| | 517 | struct l2tp_tunnel *tunnel; |
| | 518 | struct l2tp_session *session; |
| | 519 | struct l2tp_session_cfg cfg = { 0, }; |
| | 520 | struct net *net = genl_info_net(info); |
| | 521 | |
| | 522 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { |
| | 523 | ret = -EINVAL; |
| | 524 | goto out; |
| | 525 | } |
| | 526 | |
| | 527 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| | 528 | tunnel = l2tp_tunnel_get(net, tunnel_id); |
| | 529 | if (!tunnel) { |
| | 530 | ret = -ENODEV; |
| | 531 | goto out; |
| | 532 | } |
| | 533 | |
| | 534 | if (!info->attrs[L2TP_ATTR_SESSION_ID]) { |
| | 535 | ret = -EINVAL; |
| | 536 | goto out_tunnel; |
| | 537 | } |
| | 538 | session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); |
| | 539 | |
| | 540 | if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) { |
| | 541 | ret = -EINVAL; |
| | 542 | goto out_tunnel; |
| | 543 | } |
| | 544 | peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]); |
| | 545 | |
| | 546 | if (!info->attrs[L2TP_ATTR_PW_TYPE]) { |
| | 547 | ret = -EINVAL; |
| | 548 | goto out_tunnel; |
| | 549 | } |
| | 550 | cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]); |
| | 551 | if (cfg.pw_type >= __L2TP_PWTYPE_MAX) { |
| | 552 | ret = -EINVAL; |
| | 553 | goto out_tunnel; |
| | 554 | } |
| | 555 | |
| | 556 | if (tunnel->version > 2) { |
| | 557 | if (info->attrs[L2TP_ATTR_OFFSET]) |
| | 558 | cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]); |
| | 559 | |
| | 560 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) |
| | 561 | cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); |
| | 562 | |
| | 563 | cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT; |
| | 564 | if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) |
| | 565 | cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]); |
| | 566 | |
| | 567 | cfg.l2specific_len = 4; |
| | 568 | if (info->attrs[L2TP_ATTR_L2SPEC_LEN]) |
| | 569 | cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]); |
| | 570 | |
| | 571 | if (info->attrs[L2TP_ATTR_COOKIE]) { |
| | 572 | u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]); |
| | 573 | if (len > 8) { |
| | 574 | ret = -EINVAL; |
| | 575 | goto out_tunnel; |
| | 576 | } |
| | 577 | cfg.cookie_len = len; |
| | 578 | memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len); |
| | 579 | } |
| | 580 | if (info->attrs[L2TP_ATTR_PEER_COOKIE]) { |
| | 581 | u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]); |
| | 582 | if (len > 8) { |
| | 583 | ret = -EINVAL; |
| | 584 | goto out_tunnel; |
| | 585 | } |
| | 586 | cfg.peer_cookie_len = len; |
| | 587 | memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len); |
| | 588 | } |
| | 589 | if (info->attrs[L2TP_ATTR_IFNAME]) |
| | 590 | cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); |
| | 591 | |
| | 592 | if (info->attrs[L2TP_ATTR_VLAN_ID]) |
| | 593 | cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]); |
| | 594 | } |
| | 595 | |
| | 596 | if (info->attrs[L2TP_ATTR_DEBUG]) |
| | 597 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); |
| | 598 | |
| | 599 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) |
| | 600 | cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); |
| | 601 | |
| | 602 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) |
| | 603 | cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); |
| | 604 | |
| | 605 | if (info->attrs[L2TP_ATTR_LNS_MODE]) |
| | 606 | cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); |
| | 607 | |
| | 608 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) |
| | 609 | cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); |
| | 610 | |
| | 611 | if (info->attrs[L2TP_ATTR_MTU]) |
| | 612 | cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); |
| | 613 | |
| | 614 | if (info->attrs[L2TP_ATTR_MRU]) |
| | 615 | cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); |
| | 616 | |
| | 617 | #ifdef CONFIG_MODULES |
| | 618 | if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) { |
| | 619 | genl_unlock(); |
| | 620 | request_module("net-l2tp-type-%u", cfg.pw_type); |
| | 621 | genl_lock(); |
| | 622 | } |
| | 623 | #endif |
| | 624 | if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) || |
| | 625 | (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) { |
| | 626 | ret = -EPROTONOSUPPORT; |
| | 627 | goto out_tunnel; |
| | 628 | } |
| | 629 | |
| | 630 | /* Check that pseudowire-specific params are present */ |
| | 631 | switch (cfg.pw_type) { |
| | 632 | case L2TP_PWTYPE_NONE: |
| | 633 | break; |
| | 634 | case L2TP_PWTYPE_ETH_VLAN: |
| | 635 | if (!info->attrs[L2TP_ATTR_VLAN_ID]) { |
| | 636 | ret = -EINVAL; |
| | 637 | goto out_tunnel; |
| | 638 | } |
| | 639 | break; |
| | 640 | case L2TP_PWTYPE_ETH: |
| | 641 | break; |
| | 642 | case L2TP_PWTYPE_PPP: |
| | 643 | case L2TP_PWTYPE_PPP_AC: |
| | 644 | break; |
| | 645 | case L2TP_PWTYPE_IP: |
| | 646 | default: |
| | 647 | ret = -EPROTONOSUPPORT; |
| | 648 | break; |
| | 649 | } |
| | 650 | |
| | 651 | ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel, |
| | 652 | session_id, |
| | 653 | peer_session_id, |
| | 654 | &cfg); |
| | 655 | |
| | 656 | if (ret >= 0) { |
| | 657 | session = l2tp_session_get(net, tunnel, session_id); |
| | 658 | if (session) { |
| | 659 | ret = l2tp_session_notify(&l2tp_nl_family, info, session, |
| | 660 | L2TP_CMD_SESSION_CREATE); |
| | 661 | l2tp_session_dec_refcount(session); |
| | 662 | } |
| | 663 | } |
| | 664 | |
| | 665 | out_tunnel: |
| | 666 | l2tp_tunnel_dec_refcount(tunnel); |
| | 667 | out: |
| | 668 | return ret; |
| | 669 | } |
| | 670 | |
| | 671 | static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info) |
| | 672 | { |
| | 673 | int ret = 0; |
| | 674 | struct l2tp_session *session; |
| | 675 | u16 pw_type; |
| | 676 | |
| | 677 | session = l2tp_nl_session_get(info); |
| | 678 | if (session == NULL) { |
| | 679 | ret = -ENODEV; |
| | 680 | goto out; |
| | 681 | } |
| | 682 | |
| | 683 | l2tp_session_notify(&l2tp_nl_family, info, |
| | 684 | session, L2TP_CMD_SESSION_DELETE); |
| | 685 | |
| | 686 | pw_type = session->pwtype; |
| | 687 | if (pw_type < __L2TP_PWTYPE_MAX) |
| | 688 | if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete) |
| | 689 | ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session); |
| | 690 | |
| | 691 | l2tp_session_dec_refcount(session); |
| | 692 | |
| | 693 | out: |
| | 694 | return ret; |
| | 695 | } |
| | 696 | |
| | 697 | static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info) |
| | 698 | { |
| | 699 | int ret = 0; |
| | 700 | struct l2tp_session *session; |
| | 701 | |
| | 702 | session = l2tp_nl_session_get(info); |
| | 703 | if (session == NULL) { |
| | 704 | ret = -ENODEV; |
| | 705 | goto out; |
| | 706 | } |
| | 707 | |
| | 708 | if (info->attrs[L2TP_ATTR_DEBUG]) |
| | 709 | session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); |
| | 710 | |
| | 711 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) |
| | 712 | session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); |
| | 713 | |
| | 714 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) |
| | 715 | session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); |
| | 716 | |
| | 717 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) { |
| | 718 | session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); |
| | 719 | l2tp_session_set_header_len(session, session->tunnel->version); |
| | 720 | } |
| | 721 | |
| | 722 | if (info->attrs[L2TP_ATTR_LNS_MODE]) |
| | 723 | session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); |
| | 724 | |
| | 725 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) |
| | 726 | session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); |
| | 727 | |
| | 728 | if (info->attrs[L2TP_ATTR_MTU]) |
| | 729 | session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); |
| | 730 | |
| | 731 | if (info->attrs[L2TP_ATTR_MRU]) |
| | 732 | session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); |
| | 733 | |
| | 734 | ret = l2tp_session_notify(&l2tp_nl_family, info, |
| | 735 | session, L2TP_CMD_SESSION_MODIFY); |
| | 736 | |
| | 737 | l2tp_session_dec_refcount(session); |
| | 738 | |
| | 739 | out: |
| | 740 | return ret; |
| | 741 | } |
| | 742 | |
| | 743 | static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags, |
| | 744 | struct l2tp_session *session, u8 cmd) |
| | 745 | { |
| | 746 | void *hdr; |
| | 747 | struct nlattr *nest; |
| | 748 | struct l2tp_tunnel *tunnel = session->tunnel; |
| | 749 | struct sock *sk = NULL; |
| | 750 | |
| | 751 | sk = tunnel->sock; |
| | 752 | |
| | 753 | hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd); |
| | 754 | if (!hdr) |
| | 755 | return -EMSGSIZE; |
| | 756 | |
| | 757 | if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || |
| | 758 | nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) || |
| | 759 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || |
| | 760 | nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, |
| | 761 | session->peer_session_id) || |
| | 762 | nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) || |
| | 763 | nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) || |
| | 764 | nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) || |
| | 765 | (session->mru && |
| | 766 | nla_put_u16(skb, L2TP_ATTR_MRU, session->mru))) |
| | 767 | goto nla_put_failure; |
| | 768 | |
| | 769 | if ((session->ifname[0] && |
| | 770 | nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) || |
| | 771 | (session->cookie_len && |
| | 772 | nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len, |
| | 773 | &session->cookie[0])) || |
| | 774 | (session->peer_cookie_len && |
| | 775 | nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, |
| | 776 | &session->peer_cookie[0])) || |
| | 777 | nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) || |
| | 778 | nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) || |
| | 779 | nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) || |
| | 780 | #ifdef CONFIG_XFRM |
| | 781 | (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) && |
| | 782 | nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) || |
| | 783 | #endif |
| | 784 | (session->reorder_timeout && |
| | 785 | nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, |
| | 786 | session->reorder_timeout, L2TP_ATTR_PAD))) |
| | 787 | goto nla_put_failure; |
| | 788 | |
| | 789 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); |
| | 790 | if (nest == NULL) |
| | 791 | goto nla_put_failure; |
| | 792 | |
| | 793 | if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS, |
| | 794 | atomic_long_read(&session->stats.tx_packets), |
| | 795 | L2TP_ATTR_STATS_PAD) || |
| | 796 | nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES, |
| | 797 | atomic_long_read(&session->stats.tx_bytes), |
| | 798 | L2TP_ATTR_STATS_PAD) || |
| | 799 | nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS, |
| | 800 | atomic_long_read(&session->stats.tx_errors), |
| | 801 | L2TP_ATTR_STATS_PAD) || |
| | 802 | nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS, |
| | 803 | atomic_long_read(&session->stats.rx_packets), |
| | 804 | L2TP_ATTR_STATS_PAD) || |
| | 805 | nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES, |
| | 806 | atomic_long_read(&session->stats.rx_bytes), |
| | 807 | L2TP_ATTR_STATS_PAD) || |
| | 808 | nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS, |
| | 809 | atomic_long_read(&session->stats.rx_seq_discards), |
| | 810 | L2TP_ATTR_STATS_PAD) || |
| | 811 | nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS, |
| | 812 | atomic_long_read(&session->stats.rx_oos_packets), |
| | 813 | L2TP_ATTR_STATS_PAD) || |
| | 814 | nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS, |
| | 815 | atomic_long_read(&session->stats.rx_errors), |
| | 816 | L2TP_ATTR_STATS_PAD)) |
| | 817 | goto nla_put_failure; |
| | 818 | nla_nest_end(skb, nest); |
| | 819 | |
| | 820 | genlmsg_end(skb, hdr); |
| | 821 | return 0; |
| | 822 | |
| | 823 | nla_put_failure: |
| | 824 | genlmsg_cancel(skb, hdr); |
| | 825 | return -1; |
| | 826 | } |
| | 827 | |
| | 828 | static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info) |
| | 829 | { |
| | 830 | struct l2tp_session *session; |
| | 831 | struct sk_buff *msg; |
| | 832 | int ret; |
| | 833 | |
| | 834 | session = l2tp_nl_session_get(info); |
| | 835 | if (session == NULL) { |
| | 836 | ret = -ENODEV; |
| | 837 | goto err; |
| | 838 | } |
| | 839 | |
| | 840 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| | 841 | if (!msg) { |
| | 842 | ret = -ENOMEM; |
| | 843 | goto err_ref; |
| | 844 | } |
| | 845 | |
| | 846 | ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq, |
| | 847 | 0, session, L2TP_CMD_SESSION_GET); |
| | 848 | if (ret < 0) |
| | 849 | goto err_ref_msg; |
| | 850 | |
| | 851 | ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid); |
| | 852 | |
| | 853 | l2tp_session_dec_refcount(session); |
| | 854 | |
| | 855 | return ret; |
| | 856 | |
| | 857 | err_ref_msg: |
| | 858 | nlmsg_free(msg); |
| | 859 | err_ref: |
| | 860 | l2tp_session_dec_refcount(session); |
| | 861 | err: |
| | 862 | return ret; |
| | 863 | } |
| | 864 | |
| | 865 | static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| | 866 | { |
| | 867 | struct net *net = sock_net(skb->sk); |
| | 868 | struct l2tp_session *session; |
| | 869 | struct l2tp_tunnel *tunnel = NULL; |
| | 870 | int ti = cb->args[0]; |
| | 871 | int si = cb->args[1]; |
| | 872 | |
| | 873 | for (;;) { |
| | 874 | if (tunnel == NULL) { |
| | 875 | tunnel = l2tp_tunnel_get_nth(net, ti); |
| | 876 | if (tunnel == NULL) |
| | 877 | goto out; |
| | 878 | } |
| | 879 | |
| | 880 | session = l2tp_session_get_nth(tunnel, si); |
| | 881 | if (session == NULL) { |
| | 882 | ti++; |
| | 883 | l2tp_tunnel_dec_refcount(tunnel); |
| | 884 | tunnel = NULL; |
| | 885 | si = 0; |
| | 886 | continue; |
| | 887 | } |
| | 888 | |
| | 889 | if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid, |
| | 890 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| | 891 | session, L2TP_CMD_SESSION_GET) < 0) { |
| | 892 | l2tp_session_dec_refcount(session); |
| | 893 | l2tp_tunnel_dec_refcount(tunnel); |
| | 894 | break; |
| | 895 | } |
| | 896 | l2tp_session_dec_refcount(session); |
| | 897 | |
| | 898 | si++; |
| | 899 | } |
| | 900 | |
| | 901 | out: |
| | 902 | cb->args[0] = ti; |
| | 903 | cb->args[1] = si; |
| | 904 | |
| | 905 | return skb->len; |
| | 906 | } |
| | 907 | |
| | 908 | static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = { |
| | 909 | [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, }, |
| | 910 | [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, }, |
| | 911 | [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, }, |
| | 912 | [L2TP_ATTR_OFFSET] = { .type = NLA_U16, }, |
| | 913 | [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, }, |
| | 914 | [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, }, |
| | 915 | [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, }, |
| | 916 | [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, }, |
| | 917 | [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, }, |
| | 918 | [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, }, |
| | 919 | [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, }, |
| | 920 | [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, }, |
| | 921 | [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, }, |
| | 922 | [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, }, |
| | 923 | [L2TP_ATTR_DEBUG] = { .type = NLA_U32, }, |
| | 924 | [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, }, |
| | 925 | [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, }, |
| | 926 | [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, }, |
| | 927 | [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, }, |
| | 928 | [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, }, |
| | 929 | [L2TP_ATTR_FD] = { .type = NLA_U32, }, |
| | 930 | [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, }, |
| | 931 | [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, }, |
| | 932 | [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, }, |
| | 933 | [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, }, |
| | 934 | [L2TP_ATTR_MTU] = { .type = NLA_U16, }, |
| | 935 | [L2TP_ATTR_MRU] = { .type = NLA_U16, }, |
| | 936 | [L2TP_ATTR_STATS] = { .type = NLA_NESTED, }, |
| | 937 | [L2TP_ATTR_IP6_SADDR] = { |
| | 938 | .type = NLA_BINARY, |
| | 939 | .len = sizeof(struct in6_addr), |
| | 940 | }, |
| | 941 | [L2TP_ATTR_IP6_DADDR] = { |
| | 942 | .type = NLA_BINARY, |
| | 943 | .len = sizeof(struct in6_addr), |
| | 944 | }, |
| | 945 | [L2TP_ATTR_IFNAME] = { |
| | 946 | .type = NLA_NUL_STRING, |
| | 947 | .len = IFNAMSIZ - 1, |
| | 948 | }, |
| | 949 | [L2TP_ATTR_COOKIE] = { |
| | 950 | .type = NLA_BINARY, |
| | 951 | .len = 8, |
| | 952 | }, |
| | 953 | [L2TP_ATTR_PEER_COOKIE] = { |
| | 954 | .type = NLA_BINARY, |
| | 955 | .len = 8, |
| | 956 | }, |
| | 957 | }; |
| | 958 | |
| | 959 | static const struct genl_ops l2tp_nl_ops[] = { |
| | 960 | { |
| | 961 | .cmd = L2TP_CMD_NOOP, |
| | 962 | .doit = l2tp_nl_cmd_noop, |
| | 963 | .policy = l2tp_nl_policy, |
| | 964 | /* can be retrieved by unprivileged users */ |
| | 965 | }, |
| | 966 | { |
| | 967 | .cmd = L2TP_CMD_TUNNEL_CREATE, |
| | 968 | .doit = l2tp_nl_cmd_tunnel_create, |
| | 969 | .policy = l2tp_nl_policy, |
| | 970 | .flags = GENL_ADMIN_PERM, |
| | 971 | }, |
| | 972 | { |
| | 973 | .cmd = L2TP_CMD_TUNNEL_DELETE, |
| | 974 | .doit = l2tp_nl_cmd_tunnel_delete, |
| | 975 | .policy = l2tp_nl_policy, |
| | 976 | .flags = GENL_ADMIN_PERM, |
| | 977 | }, |
| | 978 | { |
| | 979 | .cmd = L2TP_CMD_TUNNEL_MODIFY, |
| | 980 | .doit = l2tp_nl_cmd_tunnel_modify, |
| | 981 | .policy = l2tp_nl_policy, |
| | 982 | .flags = GENL_ADMIN_PERM, |
| | 983 | }, |
| | 984 | { |
| | 985 | .cmd = L2TP_CMD_TUNNEL_GET, |
| | 986 | .doit = l2tp_nl_cmd_tunnel_get, |
| | 987 | .dumpit = l2tp_nl_cmd_tunnel_dump, |
| | 988 | .policy = l2tp_nl_policy, |
| | 989 | .flags = GENL_ADMIN_PERM, |
| | 990 | }, |
| | 991 | { |
| | 992 | .cmd = L2TP_CMD_SESSION_CREATE, |
| | 993 | .doit = l2tp_nl_cmd_session_create, |
| | 994 | .policy = l2tp_nl_policy, |
| | 995 | .flags = GENL_ADMIN_PERM, |
| | 996 | }, |
| | 997 | { |
| | 998 | .cmd = L2TP_CMD_SESSION_DELETE, |
| | 999 | .doit = l2tp_nl_cmd_session_delete, |
| | 1000 | .policy = l2tp_nl_policy, |
| | 1001 | .flags = GENL_ADMIN_PERM, |
| | 1002 | }, |
| | 1003 | { |
| | 1004 | .cmd = L2TP_CMD_SESSION_MODIFY, |
| | 1005 | .doit = l2tp_nl_cmd_session_modify, |
| | 1006 | .policy = l2tp_nl_policy, |
| | 1007 | .flags = GENL_ADMIN_PERM, |
| | 1008 | }, |
| | 1009 | { |
| | 1010 | .cmd = L2TP_CMD_SESSION_GET, |
| | 1011 | .doit = l2tp_nl_cmd_session_get, |
| | 1012 | .dumpit = l2tp_nl_cmd_session_dump, |
| | 1013 | .policy = l2tp_nl_policy, |
| | 1014 | .flags = GENL_ADMIN_PERM, |
| | 1015 | }, |
| | 1016 | }; |
| | 1017 | |
| | 1018 | static struct genl_family l2tp_nl_family __ro_after_init = { |
| | 1019 | .name = L2TP_GENL_NAME, |
| | 1020 | .version = L2TP_GENL_VERSION, |
| | 1021 | .hdrsize = 0, |
| | 1022 | .maxattr = L2TP_ATTR_MAX, |
| | 1023 | .netnsok = true, |
| | 1024 | .module = THIS_MODULE, |
| | 1025 | .ops = l2tp_nl_ops, |
| | 1026 | .n_ops = ARRAY_SIZE(l2tp_nl_ops), |
| | 1027 | .mcgrps = l2tp_multicast_group, |
| | 1028 | .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group), |
| | 1029 | }; |
| | 1030 | |
| | 1031 | int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops) |
| | 1032 | { |
| | 1033 | int ret; |
| | 1034 | |
| | 1035 | ret = -EINVAL; |
| | 1036 | if (pw_type >= __L2TP_PWTYPE_MAX) |
| | 1037 | goto err; |
| | 1038 | |
| | 1039 | genl_lock(); |
| | 1040 | ret = -EBUSY; |
| | 1041 | if (l2tp_nl_cmd_ops[pw_type]) |
| | 1042 | goto out; |
| | 1043 | |
| | 1044 | l2tp_nl_cmd_ops[pw_type] = ops; |
| | 1045 | ret = 0; |
| | 1046 | |
| | 1047 | out: |
| | 1048 | genl_unlock(); |
| | 1049 | err: |
| | 1050 | return ret; |
| | 1051 | } |
| | 1052 | EXPORT_SYMBOL_GPL(l2tp_nl_register_ops); |
| | 1053 | |
| | 1054 | void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type) |
| | 1055 | { |
| | 1056 | if (pw_type < __L2TP_PWTYPE_MAX) { |
| | 1057 | genl_lock(); |
| | 1058 | l2tp_nl_cmd_ops[pw_type] = NULL; |
| | 1059 | genl_unlock(); |
| | 1060 | } |
| | 1061 | } |
| | 1062 | EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops); |
| | 1063 | |
| | 1064 | static int __init l2tp_nl_init(void) |
| | 1065 | { |
| | 1066 | pr_info("L2TP netlink interface\n"); |
| | 1067 | return genl_register_family(&l2tp_nl_family); |
| | 1068 | } |
| | 1069 | |
| | 1070 | static void l2tp_nl_cleanup(void) |
| | 1071 | { |
| | 1072 | genl_unregister_family(&l2tp_nl_family); |
| | 1073 | } |
| | 1074 | |
| | 1075 | module_init(l2tp_nl_init); |
| | 1076 | module_exit(l2tp_nl_cleanup); |
| | 1077 | |
| | 1078 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); |
| | 1079 | MODULE_DESCRIPTION("L2TP netlink"); |
| | 1080 | MODULE_LICENSE("GPL"); |
| | 1081 | MODULE_VERSION("1.0"); |
| | 1082 | MODULE_ALIAS_GENL_FAMILY("l2tp"); |
projects / mirror_ubuntu-bionic-kernel.git / blame_incremental