diff options
| -rw-r--r-- | include/linux/l2tp.h | 17 | ||||
| -rw-r--r-- | net/l2tp/Makefile | 3 | ||||
| -rw-r--r-- | net/l2tp/l2tp_ip6.c | 792 |
3 files changed, 812 insertions, 0 deletions
diff --git a/include/linux/l2tp.h b/include/linux/l2tp.h index 16b8347..7eab668 100644 --- a/include/linux/l2tp.h +++ b/include/linux/l2tp.h @@ -11,6 +11,7 @@ #include <linux/socket.h> #ifdef __KERNEL__ #include <linux/in.h> +#include <linux/in6.h> #else #include <netinet/in.h> #endif @@ -39,6 +40,22 @@ struct sockaddr_l2tpip { sizeof(__u32)]; }; +/** + * struct sockaddr_l2tpip6 - the sockaddr structure for L2TP-over-IPv6 sockets + * @l2tp_family: address family number AF_L2TPIP. + * @l2tp_addr: protocol specific address information + * @l2tp_conn_id: connection id of tunnel + */ +struct sockaddr_l2tpip6 { + /* The first fields must match struct sockaddr_in6 */ + __kernel_sa_family_t l2tp_family; /* AF_INET6 */ + __be16 l2tp_unused; /* INET port number (unused) */ + __be32 l2tp_flowinfo; /* IPv6 flow information */ + struct in6_addr l2tp_addr; /* IPv6 address */ + __u32 l2tp_scope_id; /* scope id (new in RFC2553) */ + __u32 l2tp_conn_id; /* Connection ID of tunnel */ +}; + /***************************************************************************** * NETLINK_GENERIC netlink family. *****************************************************************************/ diff --git a/net/l2tp/Makefile b/net/l2tp/Makefile index 110e7bc..2870f41 100644 --- a/net/l2tp/Makefile +++ b/net/l2tp/Makefile @@ -10,3 +10,6 @@ obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_IP)) += l2tp_ip.o obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_V3)) += l2tp_netlink.o obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_ETH)) += l2tp_eth.o obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_DEBUGFS)) += l2tp_debugfs.o +ifneq ($(CONFIG_IPV6),) +obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_IP)) += l2tp_ip6.o +endif diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c new file mode 100644 index 0000000..88f0abe --- /dev/null +++ b/net/l2tp/l2tp_ip6.c @@ -0,0 +1,792 @@ +/* + * L2TPv3 IP encapsulation support for IPv6 + * + * Copyright (c) 2012 Katalix Systems Ltd + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/icmp.h> +#include <linux/module.h> +#include <linux/skbuff.h> +#include <linux/random.h> +#include <linux/socket.h> +#include <linux/l2tp.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <net/sock.h> +#include <net/ip.h> +#include <net/icmp.h> +#include <net/udp.h> +#include <net/inet_common.h> +#include <net/inet_hashtables.h> +#include <net/tcp_states.h> +#include <net/protocol.h> +#include <net/xfrm.h> + +#include <net/transp_v6.h> +#include <net/addrconf.h> +#include <net/ip6_route.h> + +#include "l2tp_core.h" + +struct l2tp_ip6_sock { + /* inet_sock has to be the first member of l2tp_ip6_sock */ + struct inet_sock inet; + + u32 conn_id; + u32 peer_conn_id; + + /* ipv6_pinfo has to be the last member of l2tp_ip6_sock, see + inet6_sk_generic */ + struct ipv6_pinfo inet6; +}; + +static DEFINE_RWLOCK(l2tp_ip6_lock); +static struct hlist_head l2tp_ip6_table; +static struct hlist_head l2tp_ip6_bind_table; + +static inline struct l2tp_ip6_sock *l2tp_ip6_sk(const struct sock *sk) +{ + return (struct l2tp_ip6_sock *)sk; +} + +static struct sock *__l2tp_ip6_bind_lookup(struct net *net, + struct in6_addr *laddr, + int dif, u32 tunnel_id) +{ + struct hlist_node *node; + struct sock *sk; + + sk_for_each_bound(sk, node, &l2tp_ip6_bind_table) { + struct in6_addr *addr = inet6_rcv_saddr(sk); + struct l2tp_ip6_sock *l2tp = l2tp_ip6_sk(sk); + + if (l2tp == NULL) + continue; + + if ((l2tp->conn_id == tunnel_id) && + net_eq(sock_net(sk), net) && + !(addr && ipv6_addr_equal(addr, laddr)) && + !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) + goto found; + } + + sk = NULL; +found: + return sk; +} + +static inline struct sock *l2tp_ip6_bind_lookup(struct net *net, + struct in6_addr *laddr, + int dif, u32 tunnel_id) +{ + struct sock *sk = __l2tp_ip6_bind_lookup(net, laddr, dif, tunnel_id); + if (sk) + sock_hold(sk); + + return sk; +} + +/* When processing receive frames, there are two cases to + * consider. Data frames consist of a non-zero session-id and an + * optional cookie. Control frames consist of a regular L2TP header + * preceded by 32-bits of zeros. + * + * L2TPv3 Session Header Over IP + * + * 0 1 2 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Session ID | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Cookie (optional, maximum 64 bits)... + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * + * L2TPv3 Control Message Header Over IP + * + * 0 1 2 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | (32 bits of zeros) | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Control Connection ID | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Ns | Nr | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * + * All control frames are passed to userspace. + */ +static int l2tp_ip6_recv(struct sk_buff *skb) +{ + struct sock *sk; + u32 session_id; + u32 tunnel_id; + unsigned char *ptr, *optr; + struct l2tp_session *session; + struct l2tp_tunnel *tunnel = NULL; + int length; + int offset; + + /* Point to L2TP header */ + optr = ptr = skb->data; + + if (!pskb_may_pull(skb, 4)) + goto discard; + + session_id = ntohl(*((__be32 *) ptr)); + ptr += 4; + + /* RFC3931: L2TP/IP packets have the first 4 bytes containing + * the session_id. If it is 0, the packet is a L2TP control + * frame and the session_id value can be discarded. + */ + if (session_id == 0) { + __skb_pull(skb, 4); + goto pass_up; + } + + /* Ok, this is a data packet. Lookup the session. */ + session = l2tp_session_find(&init_net, NULL, session_id); + if (session == NULL) + goto discard; + + tunnel = session->tunnel; + if (tunnel == NULL) + goto discard; + + /* Trace packet contents, if enabled */ + if (tunnel->debug & L2TP_MSG_DATA) { + length = min(32u, skb->len); + if (!pskb_may_pull(skb, length)) + goto discard; + + printk(KERN_DEBUG "%s: ip recv: ", tunnel->name); + + offset = 0; + do { + printk(" %02X", ptr[offset]); + } while (++offset < length); + + printk("\n"); + } + + l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, + tunnel->recv_payload_hook); + return 0; + +pass_up: + /* Get the tunnel_id from the L2TP header */ + if (!pskb_may_pull(skb, 12)) + goto discard; + + if ((skb->data[0] & 0xc0) != 0xc0) + goto discard; + + tunnel_id = ntohl(*(__be32 *) &skb->data[4]); + tunnel = l2tp_tunnel_find(&init_net, tunnel_id); + if (tunnel != NULL) + sk = tunnel->sock; + else { + struct ipv6hdr *iph = ipv6_hdr(skb); + + read_lock_bh(&l2tp_ip6_lock); + sk = __l2tp_ip6_bind_lookup(&init_net, &iph->daddr, + 0, tunnel_id); + read_unlock_bh(&l2tp_ip6_lock); + } + + if (sk == NULL) + goto discard; + + sock_hold(sk); + + if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) + goto discard_put; + + nf_reset(skb); + + return sk_receive_skb(sk, skb, 1); + +discard_put: + sock_put(sk); + +discard: + kfree_skb(skb); + return 0; +} + +static int l2tp_ip6_open(struct sock *sk) +{ + /* Prevent autobind. We don't have ports. */ + inet_sk(sk)->inet_num = IPPROTO_L2TP; + + write_lock_bh(&l2tp_ip6_lock); + sk_add_node(sk, &l2tp_ip6_table); + write_unlock_bh(&l2tp_ip6_lock); + + return 0; +} + +static void l2tp_ip6_close(struct sock *sk, long timeout) +{ + write_lock_bh(&l2tp_ip6_lock); + hlist_del_init(&sk->sk_bind_node); + sk_del_node_init(sk); + write_unlock_bh(&l2tp_ip6_lock); + + sk_common_release(sk); +} + +static void l2tp_ip6_destroy_sock(struct sock *sk) +{ + lock_sock(sk); + ip6_flush_pending_frames(sk); + release_sock(sk); + + inet6_destroy_sock(sk); +} + +static int l2tp_ip6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) +{ + struct inet_sock *inet = inet_sk(sk); + struct ipv6_pinfo *np = inet6_sk(sk); + struct sockaddr_l2tpip6 *addr = (struct sockaddr_l2tpip6 *) uaddr; + __be32 v4addr = 0; + int addr_type; + int err; + + if (addr_len < sizeof(*addr)) + return -EINVAL; + + addr_type = ipv6_addr_type(&addr->l2tp_addr); + + /* l2tp_ip6 sockets are IPv6 only */ + if (addr_type == IPV6_ADDR_MAPPED) + return -EADDRNOTAVAIL; + + /* L2TP is point-point, not multicast */ + if (addr_type & IPV6_ADDR_MULTICAST) + return -EADDRNOTAVAIL; + + err = -EADDRINUSE; + read_lock_bh(&l2tp_ip6_lock); + if (__l2tp_ip6_bind_lookup(&init_net, &addr->l2tp_addr, + sk->sk_bound_dev_if, addr->l2tp_conn_id)) + goto out_in_use; + read_unlock_bh(&l2tp_ip6_lock); + + lock_sock(sk); + + err = -EINVAL; + if (sk->sk_state != TCP_CLOSE) + goto out_unlock; + + /* Check if the address belongs to the host. */ + rcu_read_lock(); + if (addr_type != IPV6_ADDR_ANY) { + struct net_device *dev = NULL; + + if (addr_type & IPV6_ADDR_LINKLOCAL) { + if (addr_len >= sizeof(struct sockaddr_in6) && + addr->l2tp_scope_id) { + /* Override any existing binding, if another + * one is supplied by user. + */ + sk->sk_bound_dev_if = addr->l2tp_scope_id; + } + + /* Binding to link-local address requires an + interface */ + if (!sk->sk_bound_dev_if) + goto out_unlock_rcu; + + err = -ENODEV; + dev = dev_get_by_index_rcu(sock_net(sk), + sk->sk_bound_dev_if); + if (!dev) + goto out_unlock_rcu; + } + + /* ipv4 addr of the socket is invalid. Only the + * unspecified and mapped address have a v4 equivalent. + */ + v4addr = LOOPBACK4_IPV6; + err = -EADDRNOTAVAIL; + if (!ipv6_chk_addr(sock_net(sk), &addr->l2tp_addr, dev, 0)) + goto out_unlock_rcu; + } + rcu_read_unlock(); + + inet->inet_rcv_saddr = inet->inet_saddr = v4addr; + np->rcv_saddr = addr->l2tp_addr; + np->saddr = addr->l2tp_addr; + + l2tp_ip6_sk(sk)->conn_id = addr->l2tp_conn_id; + + write_lock_bh(&l2tp_ip6_lock); + sk_add_bind_node(sk, &l2tp_ip6_bind_table); + sk_del_node_init(sk); + write_unlock_bh(&l2tp_ip6_lock); + + release_sock(sk); + return 0; + +out_unlock_rcu: + rcu_read_unlock(); +out_unlock: + release_sock(sk); + return err; + +out_in_use: + read_unlock_bh(&l2tp_ip6_lock); + return err; +} + +static int l2tp_ip6_connect(struct sock *sk, struct sockaddr *uaddr, + int addr_len) +{ + struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *) uaddr; + struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; + struct in6_addr *daddr; + int addr_type; + int rc; + + if (addr_len < sizeof(*lsa)) + return -EINVAL; + + addr_type = ipv6_addr_type(&usin->sin6_addr); + if (addr_type & IPV6_ADDR_MULTICAST) + return -EINVAL; + + if (addr_type & IPV6_ADDR_MAPPED) { + daddr = &usin->sin6_addr; + if (ipv4_is_multicast(daddr->s6_addr32[3])) + return -EINVAL; + } + + rc = ip6_datagram_connect(sk, uaddr, addr_len); + + lock_sock(sk); + + l2tp_ip6_sk(sk)->peer_conn_id = lsa->l2tp_conn_id; + + write_lock_bh(&l2tp_ip6_lock); + hlist_del_init(&sk->sk_bind_node); + sk_add_bind_node(sk, &l2tp_ip6_bind_table); + write_unlock_bh(&l2tp_ip6_lock); + + release_sock(sk); + + return rc; +} + +static int l2tp_ip6_getname(struct socket *sock, struct sockaddr *uaddr, + int *uaddr_len, int peer) +{ + struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)uaddr; + struct sock *sk = sock->sk; + struct ipv6_pinfo *np = inet6_sk(sk); + struct l2tp_ip6_sock *lsk = l2tp_ip6_sk(sk); + + lsa->l2tp_family = AF_INET6; + lsa->l2tp_flowinfo = 0; + lsa->l2tp_scope_id = 0; + if (peer) { + if (!lsk->peer_conn_id) + return -ENOTCONN; + lsa->l2tp_conn_id = lsk->peer_conn_id; + lsa->l2tp_addr = np->daddr; + if (np->sndflow) + lsa->l2tp_flowinfo = np->flow_label; + } else { + if (ipv6_addr_any(&np->rcv_saddr)) + lsa->l2tp_addr = np->saddr; + else + lsa->l2tp_addr = np->rcv_saddr; + + lsa->l2tp_conn_id = lsk->conn_id; + } + if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL) + lsa->l2tp_scope_id = sk->sk_bound_dev_if; + *uaddr_len = sizeof(*lsa); + return 0; +} + +static int l2tp_ip6_backlog_recv(struct sock *sk, struct sk_buff *skb) +{ + int rc; + + /* Charge it to the socket, dropping if the queue is full. */ + rc = sock_queue_rcv_skb(sk, skb); + if (rc < 0) + goto drop; + + return 0; + +drop: + IP_INC_STATS(&init_net, IPSTATS_MIB_INDISCARDS); + kfree_skb(skb); + return -1; +} + +static int l2tp_ip6_push_pending_frames(struct sock *sk) +{ + struct sk_buff *skb; + __be32 *transhdr = NULL; + int err = 0; + + skb = skb_peek(&sk->sk_write_queue); + if (skb == NULL) + goto out; + + transhdr = (__be32 *)skb_transport_header(skb); + *transhdr = 0; + + err = ip6_push_pending_frames(sk); + +out: + return err; +} + +/* Userspace will call sendmsg() on the tunnel socket to send L2TP + * control frames. + */ +static int l2tp_ip6_sendmsg(struct kiocb *iocb, struct sock *sk, + struct msghdr *msg, size_t len) +{ + struct ipv6_txoptions opt_space; + struct sockaddr_l2tpip6 *lsa = + (struct sockaddr_l2tpip6 *) msg->msg_name; + struct in6_addr *daddr, *final_p, final; + struct ipv6_pinfo *np = inet6_sk(sk); + struct ipv6_txoptions *opt = NULL; + struct ip6_flowlabel *flowlabel = NULL; + struct dst_entry *dst = NULL; + struct flowi6 fl6; + int addr_len = msg->msg_namelen; + int hlimit = -1; + int tclass = -1; + int dontfrag = -1; + int transhdrlen = 4; /* zero session-id */ + int ulen = len + transhdrlen; + int err; + + /* Rough check on arithmetic overflow, + better check is made in ip6_append_data(). + */ + if (len > INT_MAX) + return -EMSGSIZE; + + /* Mirror BSD error message compatibility */ + if (msg->msg_flags & MSG_OOB) + return -EOPNOTSUPP; + + /* + * Get and verify the address. + */ + memset(&fl6, 0, sizeof(fl6)); + + fl6.flowi6_mark = sk->sk_mark; + + if (lsa) { + if (addr_len < SIN6_LEN_RFC2133) + return -EINVAL; + + if (lsa->l2tp_family && lsa->l2tp_family != AF_INET6) + return -EAFNOSUPPORT; + + daddr = &lsa->l2tp_addr; + if (np->sndflow) { + fl6.flowlabel = lsa->l2tp_flowinfo & IPV6_FLOWINFO_MASK; + if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { + flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); + if (flowlabel == NULL) + return -EINVAL; + daddr = &flowlabel->dst; + } + } + + /* + * Otherwise it will be difficult to maintain + * sk->sk_dst_cache. + */ + if (sk->sk_state == TCP_ESTABLISHED && + ipv6_addr_equal(daddr, &np->daddr)) + daddr = &np->daddr; + + if (addr_len >= sizeof(struct sockaddr_in6) && + lsa->l2tp_scope_id && + ipv6_addr_type(daddr) & IPV6_ADDR_LINKLOCAL) + fl6.flowi6_oif = lsa->l2tp_scope_id; + } else { + if (sk->sk_state != TCP_ESTABLISHED) + return -EDESTADDRREQ; + + daddr = &np->daddr; + fl6.flowlabel = np->flow_label; + } + + if (fl6.flowi6_oif == 0) + fl6.flowi6_oif = sk->sk_bound_dev_if; + + if (msg->msg_controllen) { + opt = &opt_space; + memset(opt, 0, sizeof(struct ipv6_txoptions)); + opt->tot_len = sizeof(struct ipv6_txoptions); + + err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, + &hlimit, &tclass, &dontfrag); + if (err < 0) { + fl6_sock_release(flowlabel); + return err; + } + if ((fl6.flowlabel & IPV6_FLOWLABEL_MASK) && !flowlabel) { + flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); + if (flowlabel == NULL) + return -EINVAL; + } + if (!(opt->opt_nflen|opt->opt_flen)) + opt = NULL; + } + + if (opt == NULL) + opt = np->opt; + if (flowlabel) + opt = fl6_merge_options(&opt_space, flowlabel, opt); + opt = ipv6_fixup_options(&opt_space, opt); + + fl6.flowi6_proto = sk->sk_protocol; + if (!ipv6_addr_any(daddr)) + fl6.daddr = *daddr; + else + fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ + if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) + fl6.saddr = np->saddr; + + final_p = fl6_update_dst(&fl6, opt, &final); + + if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) + fl6.flowi6_oif = np->mcast_oif; + else if (!fl6.flowi6_oif) + fl6.flowi6_oif = np->ucast_oif; + + security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); + + dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); + if (IS_ERR(dst)) { + err = PTR_ERR(dst); + goto out; + } + + if (hlimit < 0) { + if (ipv6_addr_is_multicast(&fl6.daddr)) + hlimit = np->mcast_hops; + else + hlimit = np->hop_limit; + if (hlimit < 0) + hlimit = ip6_dst_hoplimit(dst); + } + + if (tclass < 0) + tclass = np->tclass; + + if (dontfrag < 0) + dontfrag = np->dontfrag; + + if (msg->msg_flags & MSG_CONFIRM) + goto do_confirm; + +back_from_confirm: + lock_sock(sk); + err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, + ulen, transhdrlen, hlimit, tclass, opt, + &fl6, (struct rt6_info *)dst, + msg->msg_flags, dontfrag); + if (err) + ip6_flush_pending_frames(sk); + else if (!(msg->msg_flags & MSG_MORE)) + err = l2tp_ip6_push_pending_frames(sk); + release_sock(sk); +done: + dst_release(dst); +out: + fl6_sock_release(flowlabel); + + return err < 0 ? err : len; + +do_confirm: + dst_confirm(dst); + if (!(msg->msg_flags & MSG_PROBE) || len) + goto back_from_confirm; + err = 0; + goto done; +} + +static int l2tp_ip6_recvmsg(struct kiocb *iocb, struct sock *sk, + struct msghdr *msg, size_t len, int noblock, + int flags, int *addr_len) +{ + struct inet_sock *inet = inet_sk(sk); + struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)msg->msg_name; + size_t copied = 0; + int err = -EOPNOTSUPP; + struct sk_buff *skb; + + if (flags & MSG_OOB) + goto out; + + if (addr_len) + *addr_len = sizeof(*lsa); + + if (flags & MSG_ERRQUEUE) + return ipv6_recv_error(sk, msg, len); + + skb = skb_recv_datagram(sk, flags, noblock, &err); + if (!skb) + goto out; + + copied = skb->len; + if (len < copied) { + msg->msg_flags |= MSG_TRUNC; + copied = len; + } + + err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); + if (err) + goto done; + + sock_recv_timestamp(msg, sk, skb); + + /* Copy the address. */ + if (lsa) { + lsa->l2tp_family = AF_INET6; + lsa->l2tp_unused = 0; + lsa->l2tp_addr = ipv6_hdr(skb)->saddr; + lsa->l2tp_flowinfo = 0; + lsa->l2tp_scope_id = 0; + if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL) + lsa->l2tp_scope_id = IP6CB(skb)->iif; + } + + if (inet->cmsg_flags) + ip_cmsg_recv(msg, skb); + + if (flags & MSG_TRUNC) + copied = skb->len; +done: + skb_free_datagram(sk, skb); +out: + return err ? err : copied; +} + +static struct proto l2tp_ip6_prot = { + .name = "L2TP/IPv6", + .owner = THIS_MODULE, + .init = l2tp_ip6_open, + .close = l2tp_ip6_close, + .bind = l2tp_ip6_bind, + .connect = l2tp_ip6_connect, + .disconnect = udp_disconnect, + .ioctl = udp_ioctl, + .destroy = l2tp_ip6_destroy_sock, + .setsockopt = ipv6_setsockopt, + .getsockopt = ipv6_getsockopt, + .sendmsg = l2tp_ip6_sendmsg, + .recvmsg = l2tp_ip6_recvmsg, + .backlog_rcv = l2tp_ip6_backlog_recv, + .hash = inet_hash, + .unhash = inet_unhash, + .obj_size = sizeof(struct l2tp_ip6_sock), +#ifdef CONFIG_COMPAT + .compat_setsockopt = compat_ipv6_setsockopt, + .compat_getsockopt = compat_ipv6_getsockopt, +#endif +}; + +static const struct proto_ops l2tp_ip6_ops = { + .family = PF_INET6, + .owner = THIS_MODULE, + .release = inet6_release, + .bind = inet6_bind, + .connect = inet_dgram_connect, + .socketpair = sock_no_socketpair, + .accept = sock_no_accept, + .getname = l2tp_ip6_getname, + .poll = datagram_poll, + .ioctl = inet6_ioctl, + .listen = sock_no_listen, + .shutdown = inet_shutdown, + .setsockopt = sock_common_setsockopt, + .getsockopt = sock_common_getsockopt, + .sendmsg = inet_sendmsg, + .recvmsg = sock_common_recvmsg, + .mmap = sock_no_mmap, + .sendpage = sock_no_sendpage, +#ifdef CONFIG_COMPAT + .compat_setsockopt = compat_sock_common_setsockopt, + .compat_getsockopt = compat_sock_common_getsockopt, +#endif +}; + +static struct inet_protosw l2tp_ip6_protosw = { + .type = SOCK_DGRAM, + .protocol = IPPROTO_L2TP, + .prot = &l2tp_ip6_prot, + .ops = &l2tp_ip6_ops, + .no_check = 0, +}; + +static struct inet6_protocol l2tp_ip6_protocol __read_mostly = { + .handler = l2tp_ip6_recv, +}; + +static int __init l2tp_ip6_init(void) +{ + int err; + + printk(KERN_INFO "L2TP IP encapsulation support for IPv6 (L2TPv3)\n"); + + err = proto_register(&l2tp_ip6_prot, 1); + if (err != 0) + goto out; + + err = inet6_add_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP); + if (err) + goto out1; + + inet6_register_protosw(&l2tp_ip6_protosw); + return 0; + +out1: + proto_unregister(&l2tp_ip6_prot); +out: + return err; +} + +static void __exit l2tp_ip6_exit(void) +{ + inet6_unregister_protosw(&l2tp_ip6_protosw); + inet6_del_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP); + proto_unregister(&l2tp_ip6_prot); +} + +module_init(l2tp_ip6_init); +module_exit(l2tp_ip6_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Chris Elston <celston@katalix.com>"); +MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6"); +MODULE_VERSION("1.0"); + +/* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like + * enums + */ +MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 2, IPPROTO_L2TP); |
