James Chapman | 309795f | 2010-04-02 06:19:10 +0000 | [diff] [blame] | 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 | #include <net/sock.h> |
| 18 | #include <net/genetlink.h> |
| 19 | #include <net/udp.h> |
| 20 | #include <linux/in.h> |
| 21 | #include <linux/udp.h> |
| 22 | #include <linux/socket.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/list.h> |
| 25 | #include <net/net_namespace.h> |
| 26 | |
| 27 | #include <linux/l2tp.h> |
| 28 | |
| 29 | #include "l2tp_core.h" |
| 30 | |
| 31 | |
| 32 | static struct genl_family l2tp_nl_family = { |
| 33 | .id = GENL_ID_GENERATE, |
| 34 | .name = L2TP_GENL_NAME, |
| 35 | .version = L2TP_GENL_VERSION, |
| 36 | .hdrsize = 0, |
| 37 | .maxattr = L2TP_ATTR_MAX, |
| 38 | }; |
| 39 | |
| 40 | /* Accessed under genl lock */ |
| 41 | static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX]; |
| 42 | |
| 43 | static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info) |
| 44 | { |
| 45 | u32 tunnel_id; |
| 46 | u32 session_id; |
| 47 | char *ifname; |
| 48 | struct l2tp_tunnel *tunnel; |
| 49 | struct l2tp_session *session = NULL; |
| 50 | struct net *net = genl_info_net(info); |
| 51 | |
| 52 | if (info->attrs[L2TP_ATTR_IFNAME]) { |
| 53 | ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); |
| 54 | session = l2tp_session_find_by_ifname(net, ifname); |
| 55 | } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) && |
| 56 | (info->attrs[L2TP_ATTR_CONN_ID])) { |
| 57 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| 58 | session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); |
| 59 | tunnel = l2tp_tunnel_find(net, tunnel_id); |
| 60 | if (tunnel) |
| 61 | session = l2tp_session_find(net, tunnel, session_id); |
| 62 | } |
| 63 | |
| 64 | return session; |
| 65 | } |
| 66 | |
| 67 | static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info) |
| 68 | { |
| 69 | struct sk_buff *msg; |
| 70 | void *hdr; |
| 71 | int ret = -ENOBUFS; |
| 72 | |
| 73 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 74 | if (!msg) { |
| 75 | ret = -ENOMEM; |
| 76 | goto out; |
| 77 | } |
| 78 | |
| 79 | hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq, |
| 80 | &l2tp_nl_family, 0, L2TP_CMD_NOOP); |
| 81 | if (IS_ERR(hdr)) { |
| 82 | ret = PTR_ERR(hdr); |
| 83 | goto err_out; |
| 84 | } |
| 85 | |
| 86 | genlmsg_end(msg, hdr); |
| 87 | |
| 88 | return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid); |
| 89 | |
| 90 | err_out: |
| 91 | nlmsg_free(msg); |
| 92 | |
| 93 | out: |
| 94 | return ret; |
| 95 | } |
| 96 | |
| 97 | static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info) |
| 98 | { |
| 99 | u32 tunnel_id; |
| 100 | u32 peer_tunnel_id; |
| 101 | int proto_version; |
| 102 | int fd; |
| 103 | int ret = 0; |
| 104 | struct l2tp_tunnel_cfg cfg = { 0, }; |
| 105 | struct l2tp_tunnel *tunnel; |
| 106 | struct net *net = genl_info_net(info); |
| 107 | |
| 108 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { |
| 109 | ret = -EINVAL; |
| 110 | goto out; |
| 111 | } |
| 112 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| 113 | |
| 114 | if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) { |
| 115 | ret = -EINVAL; |
| 116 | goto out; |
| 117 | } |
| 118 | peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]); |
| 119 | |
| 120 | if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) { |
| 121 | ret = -EINVAL; |
| 122 | goto out; |
| 123 | } |
| 124 | proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]); |
| 125 | |
| 126 | if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) { |
| 127 | ret = -EINVAL; |
| 128 | goto out; |
| 129 | } |
| 130 | cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]); |
| 131 | |
James Chapman | 789a4a2 | 2010-04-02 06:19:40 +0000 | [diff] [blame] | 132 | fd = -1; |
| 133 | if (info->attrs[L2TP_ATTR_FD]) { |
| 134 | fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]); |
| 135 | } else { |
| 136 | if (info->attrs[L2TP_ATTR_IP_SADDR]) |
| 137 | cfg.local_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_SADDR]); |
| 138 | if (info->attrs[L2TP_ATTR_IP_DADDR]) |
| 139 | cfg.peer_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_DADDR]); |
| 140 | if (info->attrs[L2TP_ATTR_UDP_SPORT]) |
| 141 | cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]); |
| 142 | if (info->attrs[L2TP_ATTR_UDP_DPORT]) |
| 143 | cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]); |
| 144 | if (info->attrs[L2TP_ATTR_UDP_CSUM]) |
| 145 | cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]); |
James Chapman | 309795f | 2010-04-02 06:19:10 +0000 | [diff] [blame] | 146 | } |
James Chapman | 309795f | 2010-04-02 06:19:10 +0000 | [diff] [blame] | 147 | |
| 148 | if (info->attrs[L2TP_ATTR_DEBUG]) |
| 149 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); |
| 150 | |
| 151 | tunnel = l2tp_tunnel_find(net, tunnel_id); |
| 152 | if (tunnel != NULL) { |
| 153 | ret = -EEXIST; |
| 154 | goto out; |
| 155 | } |
| 156 | |
| 157 | ret = -EINVAL; |
| 158 | switch (cfg.encap) { |
| 159 | case L2TP_ENCAPTYPE_UDP: |
| 160 | case L2TP_ENCAPTYPE_IP: |
| 161 | ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id, |
| 162 | peer_tunnel_id, &cfg, &tunnel); |
| 163 | break; |
| 164 | } |
| 165 | |
| 166 | out: |
| 167 | return ret; |
| 168 | } |
| 169 | |
| 170 | static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info) |
| 171 | { |
| 172 | struct l2tp_tunnel *tunnel; |
| 173 | u32 tunnel_id; |
| 174 | int ret = 0; |
| 175 | struct net *net = genl_info_net(info); |
| 176 | |
| 177 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { |
| 178 | ret = -EINVAL; |
| 179 | goto out; |
| 180 | } |
| 181 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| 182 | |
| 183 | tunnel = l2tp_tunnel_find(net, tunnel_id); |
| 184 | if (tunnel == NULL) { |
| 185 | ret = -ENODEV; |
| 186 | goto out; |
| 187 | } |
| 188 | |
| 189 | (void) l2tp_tunnel_delete(tunnel); |
| 190 | |
| 191 | out: |
| 192 | return ret; |
| 193 | } |
| 194 | |
| 195 | static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info) |
| 196 | { |
| 197 | struct l2tp_tunnel *tunnel; |
| 198 | u32 tunnel_id; |
| 199 | int ret = 0; |
| 200 | struct net *net = genl_info_net(info); |
| 201 | |
| 202 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { |
| 203 | ret = -EINVAL; |
| 204 | goto out; |
| 205 | } |
| 206 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| 207 | |
| 208 | tunnel = l2tp_tunnel_find(net, tunnel_id); |
| 209 | if (tunnel == NULL) { |
| 210 | ret = -ENODEV; |
| 211 | goto out; |
| 212 | } |
| 213 | |
| 214 | if (info->attrs[L2TP_ATTR_DEBUG]) |
| 215 | tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); |
| 216 | |
| 217 | out: |
| 218 | return ret; |
| 219 | } |
| 220 | |
| 221 | static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags, |
| 222 | struct l2tp_tunnel *tunnel) |
| 223 | { |
| 224 | void *hdr; |
| 225 | struct nlattr *nest; |
| 226 | struct sock *sk = NULL; |
| 227 | struct inet_sock *inet; |
| 228 | |
| 229 | hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, |
| 230 | L2TP_CMD_TUNNEL_GET); |
| 231 | if (IS_ERR(hdr)) |
| 232 | return PTR_ERR(hdr); |
| 233 | |
| 234 | NLA_PUT_U8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version); |
| 235 | NLA_PUT_U32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id); |
| 236 | NLA_PUT_U32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id); |
| 237 | NLA_PUT_U32(skb, L2TP_ATTR_DEBUG, tunnel->debug); |
| 238 | NLA_PUT_U16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap); |
| 239 | |
| 240 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); |
| 241 | if (nest == NULL) |
| 242 | goto nla_put_failure; |
| 243 | |
| 244 | NLA_PUT_U64(skb, L2TP_ATTR_TX_PACKETS, tunnel->stats.tx_packets); |
| 245 | NLA_PUT_U64(skb, L2TP_ATTR_TX_BYTES, tunnel->stats.tx_bytes); |
| 246 | NLA_PUT_U64(skb, L2TP_ATTR_TX_ERRORS, tunnel->stats.tx_errors); |
| 247 | NLA_PUT_U64(skb, L2TP_ATTR_RX_PACKETS, tunnel->stats.rx_packets); |
| 248 | NLA_PUT_U64(skb, L2TP_ATTR_RX_BYTES, tunnel->stats.rx_bytes); |
| 249 | NLA_PUT_U64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, tunnel->stats.rx_seq_discards); |
| 250 | NLA_PUT_U64(skb, L2TP_ATTR_RX_OOS_PACKETS, tunnel->stats.rx_oos_packets); |
| 251 | NLA_PUT_U64(skb, L2TP_ATTR_RX_ERRORS, tunnel->stats.rx_errors); |
| 252 | nla_nest_end(skb, nest); |
| 253 | |
| 254 | sk = tunnel->sock; |
| 255 | if (!sk) |
| 256 | goto out; |
| 257 | |
| 258 | inet = inet_sk(sk); |
| 259 | |
| 260 | switch (tunnel->encap) { |
| 261 | case L2TP_ENCAPTYPE_UDP: |
| 262 | NLA_PUT_U16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)); |
| 263 | NLA_PUT_U16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)); |
| 264 | NLA_PUT_U8(skb, L2TP_ATTR_UDP_CSUM, (sk->sk_no_check != UDP_CSUM_NOXMIT)); |
| 265 | /* NOBREAK */ |
| 266 | case L2TP_ENCAPTYPE_IP: |
| 267 | NLA_PUT_BE32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr); |
| 268 | NLA_PUT_BE32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr); |
| 269 | break; |
| 270 | } |
| 271 | |
| 272 | out: |
| 273 | return genlmsg_end(skb, hdr); |
| 274 | |
| 275 | nla_put_failure: |
| 276 | genlmsg_cancel(skb, hdr); |
| 277 | return -1; |
| 278 | } |
| 279 | |
| 280 | static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info) |
| 281 | { |
| 282 | struct l2tp_tunnel *tunnel; |
| 283 | struct sk_buff *msg; |
| 284 | u32 tunnel_id; |
| 285 | int ret = -ENOBUFS; |
| 286 | struct net *net = genl_info_net(info); |
| 287 | |
| 288 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { |
| 289 | ret = -EINVAL; |
| 290 | goto out; |
| 291 | } |
| 292 | |
| 293 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| 294 | |
| 295 | tunnel = l2tp_tunnel_find(net, tunnel_id); |
| 296 | if (tunnel == NULL) { |
| 297 | ret = -ENODEV; |
| 298 | goto out; |
| 299 | } |
| 300 | |
| 301 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 302 | if (!msg) { |
| 303 | ret = -ENOMEM; |
| 304 | goto out; |
| 305 | } |
| 306 | |
| 307 | ret = l2tp_nl_tunnel_send(msg, info->snd_pid, info->snd_seq, |
| 308 | NLM_F_ACK, tunnel); |
| 309 | if (ret < 0) |
| 310 | goto err_out; |
| 311 | |
| 312 | return genlmsg_unicast(net, msg, info->snd_pid); |
| 313 | |
| 314 | err_out: |
| 315 | nlmsg_free(msg); |
| 316 | |
| 317 | out: |
| 318 | return ret; |
| 319 | } |
| 320 | |
| 321 | static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 322 | { |
| 323 | int ti = cb->args[0]; |
| 324 | struct l2tp_tunnel *tunnel; |
| 325 | struct net *net = sock_net(skb->sk); |
| 326 | |
| 327 | for (;;) { |
| 328 | tunnel = l2tp_tunnel_find_nth(net, ti); |
| 329 | if (tunnel == NULL) |
| 330 | goto out; |
| 331 | |
| 332 | if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).pid, |
| 333 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| 334 | tunnel) <= 0) |
| 335 | goto out; |
| 336 | |
| 337 | ti++; |
| 338 | } |
| 339 | |
| 340 | out: |
| 341 | cb->args[0] = ti; |
| 342 | |
| 343 | return skb->len; |
| 344 | } |
| 345 | |
| 346 | static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info) |
| 347 | { |
| 348 | u32 tunnel_id = 0; |
| 349 | u32 session_id; |
| 350 | u32 peer_session_id; |
| 351 | int ret = 0; |
| 352 | struct l2tp_tunnel *tunnel; |
| 353 | struct l2tp_session *session; |
| 354 | struct l2tp_session_cfg cfg = { 0, }; |
| 355 | struct net *net = genl_info_net(info); |
| 356 | |
| 357 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { |
| 358 | ret = -EINVAL; |
| 359 | goto out; |
| 360 | } |
| 361 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); |
| 362 | tunnel = l2tp_tunnel_find(net, tunnel_id); |
| 363 | if (!tunnel) { |
| 364 | ret = -ENODEV; |
| 365 | goto out; |
| 366 | } |
| 367 | |
| 368 | if (!info->attrs[L2TP_ATTR_SESSION_ID]) { |
| 369 | ret = -EINVAL; |
| 370 | goto out; |
| 371 | } |
| 372 | session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); |
| 373 | session = l2tp_session_find(net, tunnel, session_id); |
| 374 | if (session) { |
| 375 | ret = -EEXIST; |
| 376 | goto out; |
| 377 | } |
| 378 | |
| 379 | if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) { |
| 380 | ret = -EINVAL; |
| 381 | goto out; |
| 382 | } |
| 383 | peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]); |
| 384 | |
| 385 | if (!info->attrs[L2TP_ATTR_PW_TYPE]) { |
| 386 | ret = -EINVAL; |
| 387 | goto out; |
| 388 | } |
| 389 | cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]); |
| 390 | if (cfg.pw_type >= __L2TP_PWTYPE_MAX) { |
| 391 | ret = -EINVAL; |
| 392 | goto out; |
| 393 | } |
| 394 | |
| 395 | if (tunnel->version > 2) { |
| 396 | if (info->attrs[L2TP_ATTR_OFFSET]) |
| 397 | cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]); |
| 398 | |
| 399 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) |
| 400 | cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); |
| 401 | |
| 402 | cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT; |
| 403 | if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) |
| 404 | cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]); |
| 405 | |
| 406 | cfg.l2specific_len = 4; |
| 407 | if (info->attrs[L2TP_ATTR_L2SPEC_LEN]) |
| 408 | cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]); |
| 409 | |
| 410 | if (info->attrs[L2TP_ATTR_COOKIE]) { |
| 411 | u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]); |
| 412 | if (len > 8) { |
| 413 | ret = -EINVAL; |
| 414 | goto out; |
| 415 | } |
| 416 | cfg.cookie_len = len; |
| 417 | memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len); |
| 418 | } |
| 419 | if (info->attrs[L2TP_ATTR_PEER_COOKIE]) { |
| 420 | u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]); |
| 421 | if (len > 8) { |
| 422 | ret = -EINVAL; |
| 423 | goto out; |
| 424 | } |
| 425 | cfg.peer_cookie_len = len; |
| 426 | memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len); |
| 427 | } |
| 428 | if (info->attrs[L2TP_ATTR_IFNAME]) |
| 429 | cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); |
| 430 | |
| 431 | if (info->attrs[L2TP_ATTR_VLAN_ID]) |
| 432 | cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]); |
| 433 | } |
| 434 | |
| 435 | if (info->attrs[L2TP_ATTR_DEBUG]) |
| 436 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); |
| 437 | |
| 438 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) |
| 439 | cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); |
| 440 | |
| 441 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) |
| 442 | cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); |
| 443 | |
| 444 | if (info->attrs[L2TP_ATTR_LNS_MODE]) |
| 445 | cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); |
| 446 | |
| 447 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) |
| 448 | cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); |
| 449 | |
| 450 | if (info->attrs[L2TP_ATTR_MTU]) |
| 451 | cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); |
| 452 | |
| 453 | if (info->attrs[L2TP_ATTR_MRU]) |
| 454 | cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); |
| 455 | |
| 456 | if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) || |
| 457 | (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) { |
| 458 | ret = -EPROTONOSUPPORT; |
| 459 | goto out; |
| 460 | } |
| 461 | |
| 462 | /* Check that pseudowire-specific params are present */ |
| 463 | switch (cfg.pw_type) { |
| 464 | case L2TP_PWTYPE_NONE: |
| 465 | break; |
| 466 | case L2TP_PWTYPE_ETH_VLAN: |
| 467 | if (!info->attrs[L2TP_ATTR_VLAN_ID]) { |
| 468 | ret = -EINVAL; |
| 469 | goto out; |
| 470 | } |
| 471 | break; |
| 472 | case L2TP_PWTYPE_ETH: |
| 473 | break; |
| 474 | case L2TP_PWTYPE_PPP: |
| 475 | case L2TP_PWTYPE_PPP_AC: |
| 476 | break; |
| 477 | case L2TP_PWTYPE_IP: |
| 478 | default: |
| 479 | ret = -EPROTONOSUPPORT; |
| 480 | break; |
| 481 | } |
| 482 | |
| 483 | ret = -EPROTONOSUPPORT; |
| 484 | if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create) |
| 485 | ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id, |
| 486 | session_id, peer_session_id, &cfg); |
| 487 | |
| 488 | out: |
| 489 | return ret; |
| 490 | } |
| 491 | |
| 492 | static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info) |
| 493 | { |
| 494 | int ret = 0; |
| 495 | struct l2tp_session *session; |
| 496 | u16 pw_type; |
| 497 | |
| 498 | session = l2tp_nl_session_find(info); |
| 499 | if (session == NULL) { |
| 500 | ret = -ENODEV; |
| 501 | goto out; |
| 502 | } |
| 503 | |
| 504 | pw_type = session->pwtype; |
| 505 | if (pw_type < __L2TP_PWTYPE_MAX) |
| 506 | if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete) |
| 507 | ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session); |
| 508 | |
| 509 | out: |
| 510 | return ret; |
| 511 | } |
| 512 | |
| 513 | static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info) |
| 514 | { |
| 515 | int ret = 0; |
| 516 | struct l2tp_session *session; |
| 517 | |
| 518 | session = l2tp_nl_session_find(info); |
| 519 | if (session == NULL) { |
| 520 | ret = -ENODEV; |
| 521 | goto out; |
| 522 | } |
| 523 | |
| 524 | if (info->attrs[L2TP_ATTR_DEBUG]) |
| 525 | session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); |
| 526 | |
| 527 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) |
| 528 | session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); |
| 529 | |
| 530 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) |
| 531 | session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); |
| 532 | |
| 533 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) |
| 534 | session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); |
| 535 | |
| 536 | if (info->attrs[L2TP_ATTR_LNS_MODE]) |
| 537 | session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); |
| 538 | |
| 539 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) |
| 540 | session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); |
| 541 | |
| 542 | if (info->attrs[L2TP_ATTR_MTU]) |
| 543 | session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); |
| 544 | |
| 545 | if (info->attrs[L2TP_ATTR_MRU]) |
| 546 | session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); |
| 547 | |
| 548 | out: |
| 549 | return ret; |
| 550 | } |
| 551 | |
| 552 | static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags, |
| 553 | struct l2tp_session *session) |
| 554 | { |
| 555 | void *hdr; |
| 556 | struct nlattr *nest; |
| 557 | struct l2tp_tunnel *tunnel = session->tunnel; |
| 558 | struct sock *sk = NULL; |
| 559 | |
| 560 | sk = tunnel->sock; |
| 561 | |
| 562 | hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET); |
| 563 | if (IS_ERR(hdr)) |
| 564 | return PTR_ERR(hdr); |
| 565 | |
| 566 | NLA_PUT_U32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id); |
| 567 | NLA_PUT_U32(skb, L2TP_ATTR_SESSION_ID, session->session_id); |
| 568 | NLA_PUT_U32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id); |
| 569 | NLA_PUT_U32(skb, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id); |
| 570 | NLA_PUT_U32(skb, L2TP_ATTR_DEBUG, session->debug); |
| 571 | NLA_PUT_U16(skb, L2TP_ATTR_PW_TYPE, session->pwtype); |
| 572 | NLA_PUT_U16(skb, L2TP_ATTR_MTU, session->mtu); |
| 573 | if (session->mru) |
| 574 | NLA_PUT_U16(skb, L2TP_ATTR_MRU, session->mru); |
| 575 | |
| 576 | if (session->ifname && session->ifname[0]) |
| 577 | NLA_PUT_STRING(skb, L2TP_ATTR_IFNAME, session->ifname); |
| 578 | if (session->cookie_len) |
| 579 | NLA_PUT(skb, L2TP_ATTR_COOKIE, session->cookie_len, &session->cookie[0]); |
| 580 | if (session->peer_cookie_len) |
| 581 | NLA_PUT(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, &session->peer_cookie[0]); |
| 582 | NLA_PUT_U8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq); |
| 583 | NLA_PUT_U8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq); |
| 584 | NLA_PUT_U8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode); |
| 585 | #ifdef CONFIG_XFRM |
| 586 | if ((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) |
| 587 | NLA_PUT_U8(skb, L2TP_ATTR_USING_IPSEC, 1); |
| 588 | #endif |
| 589 | if (session->reorder_timeout) |
| 590 | NLA_PUT_MSECS(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout); |
| 591 | |
| 592 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); |
| 593 | if (nest == NULL) |
| 594 | goto nla_put_failure; |
| 595 | NLA_PUT_U64(skb, L2TP_ATTR_TX_PACKETS, session->stats.tx_packets); |
| 596 | NLA_PUT_U64(skb, L2TP_ATTR_TX_BYTES, session->stats.tx_bytes); |
| 597 | NLA_PUT_U64(skb, L2TP_ATTR_TX_ERRORS, session->stats.tx_errors); |
| 598 | NLA_PUT_U64(skb, L2TP_ATTR_RX_PACKETS, session->stats.rx_packets); |
| 599 | NLA_PUT_U64(skb, L2TP_ATTR_RX_BYTES, session->stats.rx_bytes); |
| 600 | NLA_PUT_U64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, session->stats.rx_seq_discards); |
| 601 | NLA_PUT_U64(skb, L2TP_ATTR_RX_OOS_PACKETS, session->stats.rx_oos_packets); |
| 602 | NLA_PUT_U64(skb, L2TP_ATTR_RX_ERRORS, session->stats.rx_errors); |
| 603 | nla_nest_end(skb, nest); |
| 604 | |
| 605 | return genlmsg_end(skb, hdr); |
| 606 | |
| 607 | nla_put_failure: |
| 608 | genlmsg_cancel(skb, hdr); |
| 609 | return -1; |
| 610 | } |
| 611 | |
| 612 | static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info) |
| 613 | { |
| 614 | struct l2tp_session *session; |
| 615 | struct sk_buff *msg; |
| 616 | int ret; |
| 617 | |
| 618 | session = l2tp_nl_session_find(info); |
| 619 | if (session == NULL) { |
| 620 | ret = -ENODEV; |
| 621 | goto out; |
| 622 | } |
| 623 | |
| 624 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 625 | if (!msg) { |
| 626 | ret = -ENOMEM; |
| 627 | goto out; |
| 628 | } |
| 629 | |
| 630 | ret = l2tp_nl_session_send(msg, info->snd_pid, info->snd_seq, |
| 631 | 0, session); |
| 632 | if (ret < 0) |
| 633 | goto err_out; |
| 634 | |
| 635 | return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid); |
| 636 | |
| 637 | err_out: |
| 638 | nlmsg_free(msg); |
| 639 | |
| 640 | out: |
| 641 | return ret; |
| 642 | } |
| 643 | |
| 644 | static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 645 | { |
| 646 | struct net *net = sock_net(skb->sk); |
| 647 | struct l2tp_session *session; |
| 648 | struct l2tp_tunnel *tunnel = NULL; |
| 649 | int ti = cb->args[0]; |
| 650 | int si = cb->args[1]; |
| 651 | |
| 652 | for (;;) { |
| 653 | if (tunnel == NULL) { |
| 654 | tunnel = l2tp_tunnel_find_nth(net, ti); |
| 655 | if (tunnel == NULL) |
| 656 | goto out; |
| 657 | } |
| 658 | |
| 659 | session = l2tp_session_find_nth(tunnel, si); |
| 660 | if (session == NULL) { |
| 661 | ti++; |
| 662 | tunnel = NULL; |
| 663 | si = 0; |
| 664 | continue; |
| 665 | } |
| 666 | |
| 667 | if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).pid, |
| 668 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| 669 | session) <= 0) |
| 670 | break; |
| 671 | |
| 672 | si++; |
| 673 | } |
| 674 | |
| 675 | out: |
| 676 | cb->args[0] = ti; |
| 677 | cb->args[1] = si; |
| 678 | |
| 679 | return skb->len; |
| 680 | } |
| 681 | |
| 682 | static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = { |
| 683 | [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, }, |
| 684 | [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, }, |
| 685 | [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, }, |
| 686 | [L2TP_ATTR_OFFSET] = { .type = NLA_U16, }, |
| 687 | [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, }, |
| 688 | [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, }, |
| 689 | [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, }, |
| 690 | [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, }, |
| 691 | [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, }, |
| 692 | [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, }, |
| 693 | [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, }, |
| 694 | [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, }, |
| 695 | [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, }, |
| 696 | [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, }, |
| 697 | [L2TP_ATTR_DEBUG] = { .type = NLA_U32, }, |
| 698 | [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, }, |
| 699 | [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, }, |
| 700 | [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, }, |
| 701 | [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, }, |
| 702 | [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, }, |
| 703 | [L2TP_ATTR_FD] = { .type = NLA_U32, }, |
| 704 | [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, }, |
| 705 | [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, }, |
| 706 | [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, }, |
| 707 | [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, }, |
| 708 | [L2TP_ATTR_MTU] = { .type = NLA_U16, }, |
| 709 | [L2TP_ATTR_MRU] = { .type = NLA_U16, }, |
| 710 | [L2TP_ATTR_STATS] = { .type = NLA_NESTED, }, |
| 711 | [L2TP_ATTR_IFNAME] = { |
| 712 | .type = NLA_NUL_STRING, |
| 713 | .len = IFNAMSIZ - 1, |
| 714 | }, |
| 715 | [L2TP_ATTR_COOKIE] = { |
| 716 | .type = NLA_BINARY, |
| 717 | .len = 8, |
| 718 | }, |
| 719 | [L2TP_ATTR_PEER_COOKIE] = { |
| 720 | .type = NLA_BINARY, |
| 721 | .len = 8, |
| 722 | }, |
| 723 | }; |
| 724 | |
| 725 | static struct genl_ops l2tp_nl_ops[] = { |
| 726 | { |
| 727 | .cmd = L2TP_CMD_NOOP, |
| 728 | .doit = l2tp_nl_cmd_noop, |
| 729 | .policy = l2tp_nl_policy, |
| 730 | /* can be retrieved by unprivileged users */ |
| 731 | }, |
| 732 | { |
| 733 | .cmd = L2TP_CMD_TUNNEL_CREATE, |
| 734 | .doit = l2tp_nl_cmd_tunnel_create, |
| 735 | .policy = l2tp_nl_policy, |
| 736 | .flags = GENL_ADMIN_PERM, |
| 737 | }, |
| 738 | { |
| 739 | .cmd = L2TP_CMD_TUNNEL_DELETE, |
| 740 | .doit = l2tp_nl_cmd_tunnel_delete, |
| 741 | .policy = l2tp_nl_policy, |
| 742 | .flags = GENL_ADMIN_PERM, |
| 743 | }, |
| 744 | { |
| 745 | .cmd = L2TP_CMD_TUNNEL_MODIFY, |
| 746 | .doit = l2tp_nl_cmd_tunnel_modify, |
| 747 | .policy = l2tp_nl_policy, |
| 748 | .flags = GENL_ADMIN_PERM, |
| 749 | }, |
| 750 | { |
| 751 | .cmd = L2TP_CMD_TUNNEL_GET, |
| 752 | .doit = l2tp_nl_cmd_tunnel_get, |
| 753 | .dumpit = l2tp_nl_cmd_tunnel_dump, |
| 754 | .policy = l2tp_nl_policy, |
| 755 | .flags = GENL_ADMIN_PERM, |
| 756 | }, |
| 757 | { |
| 758 | .cmd = L2TP_CMD_SESSION_CREATE, |
| 759 | .doit = l2tp_nl_cmd_session_create, |
| 760 | .policy = l2tp_nl_policy, |
| 761 | .flags = GENL_ADMIN_PERM, |
| 762 | }, |
| 763 | { |
| 764 | .cmd = L2TP_CMD_SESSION_DELETE, |
| 765 | .doit = l2tp_nl_cmd_session_delete, |
| 766 | .policy = l2tp_nl_policy, |
| 767 | .flags = GENL_ADMIN_PERM, |
| 768 | }, |
| 769 | { |
| 770 | .cmd = L2TP_CMD_SESSION_MODIFY, |
| 771 | .doit = l2tp_nl_cmd_session_modify, |
| 772 | .policy = l2tp_nl_policy, |
| 773 | .flags = GENL_ADMIN_PERM, |
| 774 | }, |
| 775 | { |
| 776 | .cmd = L2TP_CMD_SESSION_GET, |
| 777 | .doit = l2tp_nl_cmd_session_get, |
| 778 | .dumpit = l2tp_nl_cmd_session_dump, |
| 779 | .policy = l2tp_nl_policy, |
| 780 | .flags = GENL_ADMIN_PERM, |
| 781 | }, |
| 782 | }; |
| 783 | |
| 784 | int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops) |
| 785 | { |
| 786 | int ret; |
| 787 | |
| 788 | ret = -EINVAL; |
| 789 | if (pw_type >= __L2TP_PWTYPE_MAX) |
| 790 | goto err; |
| 791 | |
| 792 | genl_lock(); |
| 793 | ret = -EBUSY; |
| 794 | if (l2tp_nl_cmd_ops[pw_type]) |
| 795 | goto out; |
| 796 | |
| 797 | l2tp_nl_cmd_ops[pw_type] = ops; |
| 798 | |
| 799 | out: |
| 800 | genl_unlock(); |
| 801 | err: |
| 802 | return 0; |
| 803 | } |
| 804 | EXPORT_SYMBOL_GPL(l2tp_nl_register_ops); |
| 805 | |
| 806 | void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type) |
| 807 | { |
| 808 | if (pw_type < __L2TP_PWTYPE_MAX) { |
| 809 | genl_lock(); |
| 810 | l2tp_nl_cmd_ops[pw_type] = NULL; |
| 811 | genl_unlock(); |
| 812 | } |
| 813 | } |
| 814 | EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops); |
| 815 | |
| 816 | static int l2tp_nl_init(void) |
| 817 | { |
| 818 | int err; |
| 819 | |
| 820 | printk(KERN_INFO "L2TP netlink interface\n"); |
| 821 | err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops, |
| 822 | ARRAY_SIZE(l2tp_nl_ops)); |
| 823 | |
| 824 | return err; |
| 825 | } |
| 826 | |
| 827 | static void l2tp_nl_cleanup(void) |
| 828 | { |
| 829 | genl_unregister_family(&l2tp_nl_family); |
| 830 | } |
| 831 | |
| 832 | module_init(l2tp_nl_init); |
| 833 | module_exit(l2tp_nl_cleanup); |
| 834 | |
| 835 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); |
| 836 | MODULE_DESCRIPTION("L2TP netlink"); |
| 837 | MODULE_LICENSE("GPL"); |
| 838 | MODULE_VERSION("1.0"); |
| 839 | MODULE_ALIAS("net-pf-" __stringify(PF_NETLINK) "-proto-" \ |
David S. Miller | f481c0d | 2010-04-03 14:58:07 -0700 | [diff] [blame^] | 840 | __stringify(NETLINK_GENERIC) "-type-" "l2tp"); |