1078 lines
27 KiB
C
1078 lines
27 KiB
C
/*
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* L2TP netlink layer, for management
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*
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* Copyright (c) 2008,2009,2010 Katalix Systems Ltd
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*
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* Partly based on the IrDA nelink implementation
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* (see net/irda/irnetlink.c) which is:
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* Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
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* which is in turn partly based on the wireless netlink code:
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* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <net/sock.h>
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#include <net/genetlink.h>
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#include <net/udp.h>
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#include <linux/in.h>
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#include <linux/udp.h>
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#include <linux/socket.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <net/net_namespace.h>
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#include <linux/l2tp.h>
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#include "l2tp_core.h"
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static struct genl_family l2tp_nl_family;
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static const struct genl_multicast_group l2tp_multicast_group[] = {
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{
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.name = L2TP_GENL_MCGROUP,
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},
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};
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static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
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int flags, struct l2tp_tunnel *tunnel, u8 cmd);
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static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
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int flags, struct l2tp_session *session,
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u8 cmd);
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/* Accessed under genl lock */
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static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
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static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info,
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bool do_ref)
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{
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u32 tunnel_id;
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u32 session_id;
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char *ifname;
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struct l2tp_tunnel *tunnel;
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struct l2tp_session *session = NULL;
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struct net *net = genl_info_net(info);
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if (info->attrs[L2TP_ATTR_IFNAME]) {
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ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
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session = l2tp_session_get_by_ifname(net, ifname, do_ref);
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} else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
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(info->attrs[L2TP_ATTR_CONN_ID])) {
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tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
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session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
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tunnel = l2tp_tunnel_get(net, tunnel_id);
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if (tunnel) {
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session = l2tp_session_get(net, tunnel, session_id,
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do_ref);
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l2tp_tunnel_dec_refcount(tunnel);
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}
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}
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return session;
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}
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static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
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{
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struct sk_buff *msg;
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void *hdr;
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int ret = -ENOBUFS;
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg) {
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ret = -ENOMEM;
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goto out;
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}
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hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
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&l2tp_nl_family, 0, L2TP_CMD_NOOP);
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if (!hdr) {
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ret = -EMSGSIZE;
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goto err_out;
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}
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genlmsg_end(msg, hdr);
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return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
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err_out:
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nlmsg_free(msg);
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out:
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return ret;
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}
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static int l2tp_tunnel_notify(struct genl_family *family,
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struct genl_info *info,
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struct l2tp_tunnel *tunnel,
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u8 cmd)
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{
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struct sk_buff *msg;
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int ret;
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
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NLM_F_ACK, tunnel, cmd);
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if (ret >= 0) {
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ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
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/* We don't care if no one is listening */
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if (ret == -ESRCH)
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ret = 0;
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return ret;
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}
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nlmsg_free(msg);
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return ret;
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}
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static int l2tp_session_notify(struct genl_family *family,
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struct genl_info *info,
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struct l2tp_session *session,
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u8 cmd)
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{
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struct sk_buff *msg;
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int ret;
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
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NLM_F_ACK, session, cmd);
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if (ret >= 0) {
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ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
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/* We don't care if no one is listening */
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if (ret == -ESRCH)
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ret = 0;
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return ret;
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}
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nlmsg_free(msg);
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return ret;
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}
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static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
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{
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u32 tunnel_id;
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u32 peer_tunnel_id;
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int proto_version;
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int fd;
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int ret = 0;
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struct l2tp_tunnel_cfg cfg = { 0, };
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struct l2tp_tunnel *tunnel;
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struct net *net = genl_info_net(info);
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if (!info->attrs[L2TP_ATTR_CONN_ID]) {
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ret = -EINVAL;
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goto out;
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}
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tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
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if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
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ret = -EINVAL;
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goto out;
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}
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peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
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if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
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ret = -EINVAL;
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goto out;
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}
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proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
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if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
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ret = -EINVAL;
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goto out;
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}
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cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
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fd = -1;
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if (info->attrs[L2TP_ATTR_FD]) {
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fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
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} else {
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#if IS_ENABLED(CONFIG_IPV6)
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if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
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info->attrs[L2TP_ATTR_IP6_DADDR]) {
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cfg.local_ip6 = nla_data(
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info->attrs[L2TP_ATTR_IP6_SADDR]);
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cfg.peer_ip6 = nla_data(
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info->attrs[L2TP_ATTR_IP6_DADDR]);
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} else
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#endif
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if (info->attrs[L2TP_ATTR_IP_SADDR] &&
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info->attrs[L2TP_ATTR_IP_DADDR]) {
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cfg.local_ip.s_addr = nla_get_in_addr(
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info->attrs[L2TP_ATTR_IP_SADDR]);
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cfg.peer_ip.s_addr = nla_get_in_addr(
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info->attrs[L2TP_ATTR_IP_DADDR]);
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} else {
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ret = -EINVAL;
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goto out;
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}
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if (info->attrs[L2TP_ATTR_UDP_SPORT])
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cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
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if (info->attrs[L2TP_ATTR_UDP_DPORT])
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cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
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cfg.use_udp_checksums = nla_get_flag(
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info->attrs[L2TP_ATTR_UDP_CSUM]);
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#if IS_ENABLED(CONFIG_IPV6)
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cfg.udp6_zero_tx_checksums = nla_get_flag(
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info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
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cfg.udp6_zero_rx_checksums = nla_get_flag(
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info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
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#endif
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}
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if (info->attrs[L2TP_ATTR_DEBUG])
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cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
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tunnel = l2tp_tunnel_find(net, tunnel_id);
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if (tunnel != NULL) {
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ret = -EEXIST;
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goto out;
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}
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ret = -EINVAL;
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switch (cfg.encap) {
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case L2TP_ENCAPTYPE_UDP:
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case L2TP_ENCAPTYPE_IP:
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ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
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peer_tunnel_id, &cfg, &tunnel);
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break;
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}
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if (ret >= 0)
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ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
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tunnel, L2TP_CMD_TUNNEL_CREATE);
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out:
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return ret;
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}
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static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
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{
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struct l2tp_tunnel *tunnel;
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u32 tunnel_id;
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int ret = 0;
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struct net *net = genl_info_net(info);
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if (!info->attrs[L2TP_ATTR_CONN_ID]) {
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ret = -EINVAL;
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goto out;
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}
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tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
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tunnel = l2tp_tunnel_get(net, tunnel_id);
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if (!tunnel) {
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ret = -ENODEV;
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goto out;
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}
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l2tp_tunnel_notify(&l2tp_nl_family, info,
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tunnel, L2TP_CMD_TUNNEL_DELETE);
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(void) l2tp_tunnel_delete(tunnel);
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l2tp_tunnel_dec_refcount(tunnel);
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out:
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return ret;
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}
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static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
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{
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struct l2tp_tunnel *tunnel;
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u32 tunnel_id;
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int ret = 0;
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struct net *net = genl_info_net(info);
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if (!info->attrs[L2TP_ATTR_CONN_ID]) {
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ret = -EINVAL;
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goto out;
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}
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tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
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tunnel = l2tp_tunnel_get(net, tunnel_id);
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if (!tunnel) {
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ret = -ENODEV;
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goto out;
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}
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if (info->attrs[L2TP_ATTR_DEBUG])
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tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
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ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
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tunnel, L2TP_CMD_TUNNEL_MODIFY);
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l2tp_tunnel_dec_refcount(tunnel);
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out:
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return ret;
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}
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static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
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struct l2tp_tunnel *tunnel, u8 cmd)
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{
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void *hdr;
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struct nlattr *nest;
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struct sock *sk = NULL;
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struct inet_sock *inet;
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#if IS_ENABLED(CONFIG_IPV6)
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struct ipv6_pinfo *np = NULL;
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#endif
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hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
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if (!hdr)
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return -EMSGSIZE;
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if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
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nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
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nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
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nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
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nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
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goto nla_put_failure;
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nest = nla_nest_start(skb, L2TP_ATTR_STATS);
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if (nest == NULL)
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goto nla_put_failure;
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if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
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atomic_long_read(&tunnel->stats.tx_packets),
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L2TP_ATTR_STATS_PAD) ||
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nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
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atomic_long_read(&tunnel->stats.tx_bytes),
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L2TP_ATTR_STATS_PAD) ||
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nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
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atomic_long_read(&tunnel->stats.tx_errors),
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L2TP_ATTR_STATS_PAD) ||
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nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
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atomic_long_read(&tunnel->stats.rx_packets),
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L2TP_ATTR_STATS_PAD) ||
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nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
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atomic_long_read(&tunnel->stats.rx_bytes),
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L2TP_ATTR_STATS_PAD) ||
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nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
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atomic_long_read(&tunnel->stats.rx_seq_discards),
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L2TP_ATTR_STATS_PAD) ||
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nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
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atomic_long_read(&tunnel->stats.rx_oos_packets),
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L2TP_ATTR_STATS_PAD) ||
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nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
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atomic_long_read(&tunnel->stats.rx_errors),
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L2TP_ATTR_STATS_PAD))
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goto nla_put_failure;
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nla_nest_end(skb, nest);
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sk = tunnel->sock;
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if (!sk)
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goto out;
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#if IS_ENABLED(CONFIG_IPV6)
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if (sk->sk_family == AF_INET6)
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np = inet6_sk(sk);
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#endif
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inet = inet_sk(sk);
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|
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switch (tunnel->encap) {
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case L2TP_ENCAPTYPE_UDP:
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switch (sk->sk_family) {
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case AF_INET:
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if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
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goto nla_put_failure;
|
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break;
|
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#if IS_ENABLED(CONFIG_IPV6)
|
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case AF_INET6:
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if (udp_get_no_check6_tx(sk) &&
|
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nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
|
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goto nla_put_failure;
|
|
if (udp_get_no_check6_rx(sk) &&
|
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nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
|
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goto nla_put_failure;
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break;
|
|
#endif
|
|
}
|
|
if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
|
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nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
|
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goto nla_put_failure;
|
|
/* NOBREAK */
|
|
case L2TP_ENCAPTYPE_IP:
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (np) {
|
|
if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
|
|
&np->saddr) ||
|
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nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
|
|
&sk->sk_v6_daddr))
|
|
goto nla_put_failure;
|
|
} else
|
|
#endif
|
|
if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
|
|
inet->inet_saddr) ||
|
|
nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
|
|
inet->inet_daddr))
|
|
goto nla_put_failure;
|
|
break;
|
|
}
|
|
|
|
out:
|
|
genlmsg_end(skb, hdr);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
genlmsg_cancel(skb, hdr);
|
|
return -1;
|
|
}
|
|
|
|
static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct l2tp_tunnel *tunnel;
|
|
struct sk_buff *msg;
|
|
u32 tunnel_id;
|
|
int ret = -ENOBUFS;
|
|
struct net *net = genl_info_net(info);
|
|
|
|
if (!info->attrs[L2TP_ATTR_CONN_ID]) {
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
|
|
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
tunnel = l2tp_tunnel_get(net, tunnel_id);
|
|
if (!tunnel) {
|
|
ret = -ENODEV;
|
|
goto err_nlmsg;
|
|
}
|
|
|
|
ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
|
|
NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
|
|
if (ret < 0)
|
|
goto err_nlmsg_tunnel;
|
|
|
|
l2tp_tunnel_dec_refcount(tunnel);
|
|
|
|
return genlmsg_unicast(net, msg, info->snd_portid);
|
|
|
|
err_nlmsg_tunnel:
|
|
l2tp_tunnel_dec_refcount(tunnel);
|
|
err_nlmsg:
|
|
nlmsg_free(msg);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int ti = cb->args[0];
|
|
struct l2tp_tunnel *tunnel;
|
|
struct net *net = sock_net(skb->sk);
|
|
|
|
for (;;) {
|
|
tunnel = l2tp_tunnel_find_nth(net, ti);
|
|
if (tunnel == NULL)
|
|
goto out;
|
|
|
|
if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
tunnel, L2TP_CMD_TUNNEL_GET) < 0)
|
|
goto out;
|
|
|
|
ti++;
|
|
}
|
|
|
|
out:
|
|
cb->args[0] = ti;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
u32 tunnel_id = 0;
|
|
u32 session_id;
|
|
u32 peer_session_id;
|
|
int ret = 0;
|
|
struct l2tp_tunnel *tunnel;
|
|
struct l2tp_session *session;
|
|
struct l2tp_session_cfg cfg = { 0, };
|
|
struct net *net = genl_info_net(info);
|
|
|
|
if (!info->attrs[L2TP_ATTR_CONN_ID]) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
|
|
tunnel = l2tp_tunnel_get(net, tunnel_id);
|
|
if (!tunnel) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
|
|
ret = -EINVAL;
|
|
goto out_tunnel;
|
|
}
|
|
session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
|
|
|
|
if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
|
|
ret = -EINVAL;
|
|
goto out_tunnel;
|
|
}
|
|
peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
|
|
|
|
if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
|
|
ret = -EINVAL;
|
|
goto out_tunnel;
|
|
}
|
|
cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
|
|
if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
|
|
ret = -EINVAL;
|
|
goto out_tunnel;
|
|
}
|
|
|
|
if (tunnel->version > 2) {
|
|
if (info->attrs[L2TP_ATTR_OFFSET])
|
|
cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
|
|
|
|
if (info->attrs[L2TP_ATTR_DATA_SEQ])
|
|
cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
|
|
|
|
cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
|
|
if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
|
|
cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
|
|
|
|
cfg.l2specific_len = 4;
|
|
if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
|
|
cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
|
|
|
|
if (info->attrs[L2TP_ATTR_COOKIE]) {
|
|
u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
|
|
if (len > 8) {
|
|
ret = -EINVAL;
|
|
goto out_tunnel;
|
|
}
|
|
cfg.cookie_len = len;
|
|
memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
|
|
}
|
|
if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
|
|
u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
|
|
if (len > 8) {
|
|
ret = -EINVAL;
|
|
goto out_tunnel;
|
|
}
|
|
cfg.peer_cookie_len = len;
|
|
memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
|
|
}
|
|
if (info->attrs[L2TP_ATTR_IFNAME])
|
|
cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
|
|
|
|
if (info->attrs[L2TP_ATTR_VLAN_ID])
|
|
cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
|
|
}
|
|
|
|
if (info->attrs[L2TP_ATTR_DEBUG])
|
|
cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
|
|
|
|
if (info->attrs[L2TP_ATTR_RECV_SEQ])
|
|
cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
|
|
|
|
if (info->attrs[L2TP_ATTR_SEND_SEQ])
|
|
cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
|
|
|
|
if (info->attrs[L2TP_ATTR_LNS_MODE])
|
|
cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
|
|
|
|
if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
|
|
cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
|
|
|
|
if (info->attrs[L2TP_ATTR_MTU])
|
|
cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
|
|
|
|
if (info->attrs[L2TP_ATTR_MRU])
|
|
cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
|
|
|
|
#ifdef CONFIG_MODULES
|
|
if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
|
|
genl_unlock();
|
|
request_module("net-l2tp-type-%u", cfg.pw_type);
|
|
genl_lock();
|
|
}
|
|
#endif
|
|
if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
|
|
(l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
|
|
ret = -EPROTONOSUPPORT;
|
|
goto out_tunnel;
|
|
}
|
|
|
|
/* Check that pseudowire-specific params are present */
|
|
switch (cfg.pw_type) {
|
|
case L2TP_PWTYPE_NONE:
|
|
break;
|
|
case L2TP_PWTYPE_ETH_VLAN:
|
|
if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
|
|
ret = -EINVAL;
|
|
goto out_tunnel;
|
|
}
|
|
break;
|
|
case L2TP_PWTYPE_ETH:
|
|
break;
|
|
case L2TP_PWTYPE_PPP:
|
|
case L2TP_PWTYPE_PPP_AC:
|
|
break;
|
|
case L2TP_PWTYPE_IP:
|
|
default:
|
|
ret = -EPROTONOSUPPORT;
|
|
break;
|
|
}
|
|
|
|
ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel,
|
|
session_id,
|
|
peer_session_id,
|
|
&cfg);
|
|
|
|
if (ret >= 0) {
|
|
session = l2tp_session_get(net, tunnel, session_id, false);
|
|
if (session) {
|
|
ret = l2tp_session_notify(&l2tp_nl_family, info, session,
|
|
L2TP_CMD_SESSION_CREATE);
|
|
l2tp_session_dec_refcount(session);
|
|
}
|
|
}
|
|
|
|
out_tunnel:
|
|
l2tp_tunnel_dec_refcount(tunnel);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int ret = 0;
|
|
struct l2tp_session *session;
|
|
u16 pw_type;
|
|
|
|
session = l2tp_nl_session_get(info, true);
|
|
if (session == NULL) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
l2tp_session_notify(&l2tp_nl_family, info,
|
|
session, L2TP_CMD_SESSION_DELETE);
|
|
|
|
pw_type = session->pwtype;
|
|
if (pw_type < __L2TP_PWTYPE_MAX)
|
|
if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
|
|
ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
|
|
|
|
if (session->deref)
|
|
session->deref(session);
|
|
l2tp_session_dec_refcount(session);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int ret = 0;
|
|
struct l2tp_session *session;
|
|
|
|
session = l2tp_nl_session_get(info, false);
|
|
if (session == NULL) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
if (info->attrs[L2TP_ATTR_DEBUG])
|
|
session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
|
|
|
|
if (info->attrs[L2TP_ATTR_DATA_SEQ])
|
|
session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
|
|
|
|
if (info->attrs[L2TP_ATTR_RECV_SEQ])
|
|
session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
|
|
|
|
if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
|
|
session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
|
|
l2tp_session_set_header_len(session, session->tunnel->version);
|
|
}
|
|
|
|
if (info->attrs[L2TP_ATTR_LNS_MODE])
|
|
session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
|
|
|
|
if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
|
|
session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
|
|
|
|
if (info->attrs[L2TP_ATTR_MTU])
|
|
session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
|
|
|
|
if (info->attrs[L2TP_ATTR_MRU])
|
|
session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
|
|
|
|
ret = l2tp_session_notify(&l2tp_nl_family, info,
|
|
session, L2TP_CMD_SESSION_MODIFY);
|
|
|
|
l2tp_session_dec_refcount(session);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
|
|
struct l2tp_session *session, u8 cmd)
|
|
{
|
|
void *hdr;
|
|
struct nlattr *nest;
|
|
struct l2tp_tunnel *tunnel = session->tunnel;
|
|
struct sock *sk = NULL;
|
|
|
|
sk = tunnel->sock;
|
|
|
|
hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
|
|
if (!hdr)
|
|
return -EMSGSIZE;
|
|
|
|
if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
|
|
nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
|
|
nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
|
|
nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
|
|
session->peer_session_id) ||
|
|
nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
|
|
nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
|
|
nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
|
|
(session->mru &&
|
|
nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
|
|
goto nla_put_failure;
|
|
|
|
if ((session->ifname[0] &&
|
|
nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
|
|
(session->cookie_len &&
|
|
nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
|
|
&session->cookie[0])) ||
|
|
(session->peer_cookie_len &&
|
|
nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
|
|
&session->peer_cookie[0])) ||
|
|
nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
|
|
nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
|
|
nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
|
|
#ifdef CONFIG_XFRM
|
|
(((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
|
|
nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
|
|
#endif
|
|
(session->reorder_timeout &&
|
|
nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
|
|
session->reorder_timeout, L2TP_ATTR_PAD)))
|
|
goto nla_put_failure;
|
|
|
|
nest = nla_nest_start(skb, L2TP_ATTR_STATS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
|
|
atomic_long_read(&session->stats.tx_packets),
|
|
L2TP_ATTR_STATS_PAD) ||
|
|
nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
|
|
atomic_long_read(&session->stats.tx_bytes),
|
|
L2TP_ATTR_STATS_PAD) ||
|
|
nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
|
|
atomic_long_read(&session->stats.tx_errors),
|
|
L2TP_ATTR_STATS_PAD) ||
|
|
nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
|
|
atomic_long_read(&session->stats.rx_packets),
|
|
L2TP_ATTR_STATS_PAD) ||
|
|
nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
|
|
atomic_long_read(&session->stats.rx_bytes),
|
|
L2TP_ATTR_STATS_PAD) ||
|
|
nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
|
|
atomic_long_read(&session->stats.rx_seq_discards),
|
|
L2TP_ATTR_STATS_PAD) ||
|
|
nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
|
|
atomic_long_read(&session->stats.rx_oos_packets),
|
|
L2TP_ATTR_STATS_PAD) ||
|
|
nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
|
|
atomic_long_read(&session->stats.rx_errors),
|
|
L2TP_ATTR_STATS_PAD))
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
|
|
genlmsg_end(skb, hdr);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
genlmsg_cancel(skb, hdr);
|
|
return -1;
|
|
}
|
|
|
|
static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct l2tp_session *session;
|
|
struct sk_buff *msg;
|
|
int ret;
|
|
|
|
session = l2tp_nl_session_get(info, false);
|
|
if (session == NULL) {
|
|
ret = -ENODEV;
|
|
goto err;
|
|
}
|
|
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg) {
|
|
ret = -ENOMEM;
|
|
goto err_ref;
|
|
}
|
|
|
|
ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
|
|
0, session, L2TP_CMD_SESSION_GET);
|
|
if (ret < 0)
|
|
goto err_ref_msg;
|
|
|
|
ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
|
|
|
|
l2tp_session_dec_refcount(session);
|
|
|
|
return ret;
|
|
|
|
err_ref_msg:
|
|
nlmsg_free(msg);
|
|
err_ref:
|
|
l2tp_session_dec_refcount(session);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct l2tp_session *session;
|
|
struct l2tp_tunnel *tunnel = NULL;
|
|
int ti = cb->args[0];
|
|
int si = cb->args[1];
|
|
|
|
for (;;) {
|
|
if (tunnel == NULL) {
|
|
tunnel = l2tp_tunnel_find_nth(net, ti);
|
|
if (tunnel == NULL)
|
|
goto out;
|
|
}
|
|
|
|
session = l2tp_session_get_nth(tunnel, si, false);
|
|
if (session == NULL) {
|
|
ti++;
|
|
tunnel = NULL;
|
|
si = 0;
|
|
continue;
|
|
}
|
|
|
|
if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
session, L2TP_CMD_SESSION_GET) < 0) {
|
|
l2tp_session_dec_refcount(session);
|
|
break;
|
|
}
|
|
l2tp_session_dec_refcount(session);
|
|
|
|
si++;
|
|
}
|
|
|
|
out:
|
|
cb->args[0] = ti;
|
|
cb->args[1] = si;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
|
|
[L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
|
|
[L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
|
|
[L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
|
|
[L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
|
|
[L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
|
|
[L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
|
|
[L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
|
|
[L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
|
|
[L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
|
|
[L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
|
|
[L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
|
|
[L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
|
|
[L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
|
|
[L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
|
|
[L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
|
|
[L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
|
|
[L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
|
|
[L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
|
|
[L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
|
|
[L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
|
|
[L2TP_ATTR_FD] = { .type = NLA_U32, },
|
|
[L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
|
|
[L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
|
|
[L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
|
|
[L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
|
|
[L2TP_ATTR_MTU] = { .type = NLA_U16, },
|
|
[L2TP_ATTR_MRU] = { .type = NLA_U16, },
|
|
[L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
|
|
[L2TP_ATTR_IP6_SADDR] = {
|
|
.type = NLA_BINARY,
|
|
.len = sizeof(struct in6_addr),
|
|
},
|
|
[L2TP_ATTR_IP6_DADDR] = {
|
|
.type = NLA_BINARY,
|
|
.len = sizeof(struct in6_addr),
|
|
},
|
|
[L2TP_ATTR_IFNAME] = {
|
|
.type = NLA_NUL_STRING,
|
|
.len = IFNAMSIZ - 1,
|
|
},
|
|
[L2TP_ATTR_COOKIE] = {
|
|
.type = NLA_BINARY,
|
|
.len = 8,
|
|
},
|
|
[L2TP_ATTR_PEER_COOKIE] = {
|
|
.type = NLA_BINARY,
|
|
.len = 8,
|
|
},
|
|
};
|
|
|
|
static const struct genl_ops l2tp_nl_ops[] = {
|
|
{
|
|
.cmd = L2TP_CMD_NOOP,
|
|
.doit = l2tp_nl_cmd_noop,
|
|
.policy = l2tp_nl_policy,
|
|
/* can be retrieved by unprivileged users */
|
|
},
|
|
{
|
|
.cmd = L2TP_CMD_TUNNEL_CREATE,
|
|
.doit = l2tp_nl_cmd_tunnel_create,
|
|
.policy = l2tp_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = L2TP_CMD_TUNNEL_DELETE,
|
|
.doit = l2tp_nl_cmd_tunnel_delete,
|
|
.policy = l2tp_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = L2TP_CMD_TUNNEL_MODIFY,
|
|
.doit = l2tp_nl_cmd_tunnel_modify,
|
|
.policy = l2tp_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = L2TP_CMD_TUNNEL_GET,
|
|
.doit = l2tp_nl_cmd_tunnel_get,
|
|
.dumpit = l2tp_nl_cmd_tunnel_dump,
|
|
.policy = l2tp_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = L2TP_CMD_SESSION_CREATE,
|
|
.doit = l2tp_nl_cmd_session_create,
|
|
.policy = l2tp_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = L2TP_CMD_SESSION_DELETE,
|
|
.doit = l2tp_nl_cmd_session_delete,
|
|
.policy = l2tp_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = L2TP_CMD_SESSION_MODIFY,
|
|
.doit = l2tp_nl_cmd_session_modify,
|
|
.policy = l2tp_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = L2TP_CMD_SESSION_GET,
|
|
.doit = l2tp_nl_cmd_session_get,
|
|
.dumpit = l2tp_nl_cmd_session_dump,
|
|
.policy = l2tp_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
};
|
|
|
|
static struct genl_family l2tp_nl_family __ro_after_init = {
|
|
.name = L2TP_GENL_NAME,
|
|
.version = L2TP_GENL_VERSION,
|
|
.hdrsize = 0,
|
|
.maxattr = L2TP_ATTR_MAX,
|
|
.netnsok = true,
|
|
.module = THIS_MODULE,
|
|
.ops = l2tp_nl_ops,
|
|
.n_ops = ARRAY_SIZE(l2tp_nl_ops),
|
|
.mcgrps = l2tp_multicast_group,
|
|
.n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
|
|
};
|
|
|
|
int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
|
|
{
|
|
int ret;
|
|
|
|
ret = -EINVAL;
|
|
if (pw_type >= __L2TP_PWTYPE_MAX)
|
|
goto err;
|
|
|
|
genl_lock();
|
|
ret = -EBUSY;
|
|
if (l2tp_nl_cmd_ops[pw_type])
|
|
goto out;
|
|
|
|
l2tp_nl_cmd_ops[pw_type] = ops;
|
|
ret = 0;
|
|
|
|
out:
|
|
genl_unlock();
|
|
err:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
|
|
|
|
void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
|
|
{
|
|
if (pw_type < __L2TP_PWTYPE_MAX) {
|
|
genl_lock();
|
|
l2tp_nl_cmd_ops[pw_type] = NULL;
|
|
genl_unlock();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
|
|
|
|
static int __init l2tp_nl_init(void)
|
|
{
|
|
pr_info("L2TP netlink interface\n");
|
|
return genl_register_family(&l2tp_nl_family);
|
|
}
|
|
|
|
static void l2tp_nl_cleanup(void)
|
|
{
|
|
genl_unregister_family(&l2tp_nl_family);
|
|
}
|
|
|
|
module_init(l2tp_nl_init);
|
|
module_exit(l2tp_nl_cleanup);
|
|
|
|
MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
|
|
MODULE_DESCRIPTION("L2TP netlink");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION("1.0");
|
|
MODULE_ALIAS_GENL_FAMILY("l2tp");
|