forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
812 lines
19 KiB
812 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* L2TPv3 IP encapsulation support for IPv6 |
|
* |
|
* Copyright (c) 2012 Katalix Systems Ltd |
|
*/ |
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
|
|
|
#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/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(const struct net *net, |
|
const struct in6_addr *laddr, |
|
const struct in6_addr *raddr, |
|
int dif, u32 tunnel_id) |
|
{ |
|
struct sock *sk; |
|
|
|
sk_for_each_bound(sk, &l2tp_ip6_bind_table) { |
|
const struct in6_addr *sk_laddr = inet6_rcv_saddr(sk); |
|
const struct in6_addr *sk_raddr = &sk->sk_v6_daddr; |
|
const struct l2tp_ip6_sock *l2tp = l2tp_ip6_sk(sk); |
|
|
|
if (!net_eq(sock_net(sk), net)) |
|
continue; |
|
|
|
if (sk->sk_bound_dev_if && dif && sk->sk_bound_dev_if != dif) |
|
continue; |
|
|
|
if (sk_laddr && !ipv6_addr_any(sk_laddr) && |
|
!ipv6_addr_any(laddr) && !ipv6_addr_equal(sk_laddr, laddr)) |
|
continue; |
|
|
|
if (!ipv6_addr_any(sk_raddr) && raddr && |
|
!ipv6_addr_any(raddr) && !ipv6_addr_equal(sk_raddr, raddr)) |
|
continue; |
|
|
|
if (l2tp->conn_id != tunnel_id) |
|
continue; |
|
|
|
goto found; |
|
} |
|
|
|
sk = NULL; |
|
found: |
|
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 net *net = dev_net(skb->dev); |
|
struct sock *sk; |
|
u32 session_id; |
|
u32 tunnel_id; |
|
unsigned char *ptr, *optr; |
|
struct l2tp_session *session; |
|
struct l2tp_tunnel *tunnel = NULL; |
|
struct ipv6hdr *iph; |
|
|
|
if (!pskb_may_pull(skb, 4)) |
|
goto discard; |
|
|
|
/* Point to L2TP header */ |
|
optr = skb->data; |
|
ptr = skb->data; |
|
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_get(net, session_id); |
|
if (!session) |
|
goto discard; |
|
|
|
tunnel = session->tunnel; |
|
if (!tunnel) |
|
goto discard_sess; |
|
|
|
if (l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr)) |
|
goto discard_sess; |
|
|
|
l2tp_recv_common(session, skb, ptr, optr, 0, skb->len); |
|
l2tp_session_dec_refcount(session); |
|
|
|
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]); |
|
iph = ipv6_hdr(skb); |
|
|
|
read_lock_bh(&l2tp_ip6_lock); |
|
sk = __l2tp_ip6_bind_lookup(net, &iph->daddr, &iph->saddr, |
|
inet6_iif(skb), tunnel_id); |
|
if (!sk) { |
|
read_unlock_bh(&l2tp_ip6_lock); |
|
goto discard; |
|
} |
|
sock_hold(sk); |
|
read_unlock_bh(&l2tp_ip6_lock); |
|
|
|
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
|
goto discard_put; |
|
|
|
nf_reset_ct(skb); |
|
|
|
return sk_receive_skb(sk, skb, 1); |
|
|
|
discard_sess: |
|
l2tp_session_dec_refcount(session); |
|
goto discard; |
|
|
|
discard_put: |
|
sock_put(sk); |
|
|
|
discard: |
|
kfree_skb(skb); |
|
return 0; |
|
} |
|
|
|
static int l2tp_ip6_hash(struct sock *sk) |
|
{ |
|
if (sk_unhashed(sk)) { |
|
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_unhash(struct sock *sk) |
|
{ |
|
if (sk_unhashed(sk)) |
|
return; |
|
write_lock_bh(&l2tp_ip6_lock); |
|
sk_del_node_init(sk); |
|
write_unlock_bh(&l2tp_ip6_lock); |
|
} |
|
|
|
static int l2tp_ip6_open(struct sock *sk) |
|
{ |
|
/* Prevent autobind. We don't have ports. */ |
|
inet_sk(sk)->inet_num = IPPROTO_L2TP; |
|
|
|
l2tp_ip6_hash(sk); |
|
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) |
|
{ |
|
struct l2tp_tunnel *tunnel = l2tp_sk_to_tunnel(sk); |
|
|
|
lock_sock(sk); |
|
ip6_flush_pending_frames(sk); |
|
release_sock(sk); |
|
|
|
if (tunnel) |
|
l2tp_tunnel_delete(tunnel); |
|
|
|
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; |
|
struct net *net = sock_net(sk); |
|
__be32 v4addr = 0; |
|
int bound_dev_if; |
|
int addr_type; |
|
int err; |
|
|
|
if (addr->l2tp_family != AF_INET6) |
|
return -EINVAL; |
|
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; |
|
|
|
lock_sock(sk); |
|
|
|
err = -EINVAL; |
|
if (!sock_flag(sk, SOCK_ZAPPED)) |
|
goto out_unlock; |
|
|
|
if (sk->sk_state != TCP_CLOSE) |
|
goto out_unlock; |
|
|
|
bound_dev_if = sk->sk_bound_dev_if; |
|
|
|
/* 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->l2tp_scope_id) |
|
bound_dev_if = addr->l2tp_scope_id; |
|
|
|
/* Binding to link-local address requires an |
|
* interface. |
|
*/ |
|
if (!bound_dev_if) |
|
goto out_unlock_rcu; |
|
|
|
err = -ENODEV; |
|
dev = dev_get_by_index_rcu(sock_net(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(); |
|
|
|
write_lock_bh(&l2tp_ip6_lock); |
|
if (__l2tp_ip6_bind_lookup(net, &addr->l2tp_addr, NULL, bound_dev_if, |
|
addr->l2tp_conn_id)) { |
|
write_unlock_bh(&l2tp_ip6_lock); |
|
err = -EADDRINUSE; |
|
goto out_unlock; |
|
} |
|
|
|
inet->inet_saddr = v4addr; |
|
inet->inet_rcv_saddr = v4addr; |
|
sk->sk_bound_dev_if = bound_dev_if; |
|
sk->sk_v6_rcv_saddr = addr->l2tp_addr; |
|
np->saddr = addr->l2tp_addr; |
|
|
|
l2tp_ip6_sk(sk)->conn_id = addr->l2tp_conn_id; |
|
|
|
sk_add_bind_node(sk, &l2tp_ip6_bind_table); |
|
sk_del_node_init(sk); |
|
write_unlock_bh(&l2tp_ip6_lock); |
|
|
|
sock_reset_flag(sk, SOCK_ZAPPED); |
|
release_sock(sk); |
|
return 0; |
|
|
|
out_unlock_rcu: |
|
rcu_read_unlock(); |
|
out_unlock: |
|
release_sock(sk); |
|
|
|
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; |
|
|
|
if (usin->sin6_family != AF_INET6) |
|
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; |
|
} |
|
|
|
lock_sock(sk); |
|
|
|
/* Must bind first - autobinding does not work */ |
|
if (sock_flag(sk, SOCK_ZAPPED)) { |
|
rc = -EINVAL; |
|
goto out_sk; |
|
} |
|
|
|
rc = __ip6_datagram_connect(sk, uaddr, addr_len); |
|
if (rc < 0) |
|
goto out_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); |
|
|
|
out_sk: |
|
release_sock(sk); |
|
|
|
return rc; |
|
} |
|
|
|
static int l2tp_ip6_disconnect(struct sock *sk, int flags) |
|
{ |
|
if (sock_flag(sk, SOCK_ZAPPED)) |
|
return 0; |
|
|
|
return __udp_disconnect(sk, flags); |
|
} |
|
|
|
static int l2tp_ip6_getname(struct socket *sock, struct sockaddr *uaddr, |
|
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; |
|
lsa->l2tp_unused = 0; |
|
if (peer) { |
|
if (!lsk->peer_conn_id) |
|
return -ENOTCONN; |
|
lsa->l2tp_conn_id = lsk->peer_conn_id; |
|
lsa->l2tp_addr = sk->sk_v6_daddr; |
|
if (np->sndflow) |
|
lsa->l2tp_flowinfo = np->flow_label; |
|
} else { |
|
if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
|
lsa->l2tp_addr = np->saddr; |
|
else |
|
lsa->l2tp_addr = sk->sk_v6_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; |
|
return sizeof(*lsa); |
|
} |
|
|
|
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(sock_net(sk), 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) |
|
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 sock *sk, struct msghdr *msg, size_t len) |
|
{ |
|
struct ipv6_txoptions opt_space; |
|
DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name); |
|
struct in6_addr *daddr, *final_p, final; |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct ipv6_txoptions *opt_to_free = NULL; |
|
struct ipv6_txoptions *opt = NULL; |
|
struct ip6_flowlabel *flowlabel = NULL; |
|
struct dst_entry *dst = NULL; |
|
struct flowi6 fl6; |
|
struct ipcm6_cookie ipc6; |
|
int addr_len = msg->msg_namelen; |
|
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; |
|
fl6.flowi6_uid = sk->sk_uid; |
|
|
|
ipcm6_init(&ipc6); |
|
|
|
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 (IS_ERR(flowlabel)) |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
/* Otherwise it will be difficult to maintain |
|
* sk->sk_dst_cache. |
|
*/ |
|
if (sk->sk_state == TCP_ESTABLISHED && |
|
ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
|
daddr = &sk->sk_v6_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 = &sk->sk_v6_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); |
|
ipc6.opt = opt; |
|
|
|
err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); |
|
if (err < 0) { |
|
fl6_sock_release(flowlabel); |
|
return err; |
|
} |
|
if ((fl6.flowlabel & IPV6_FLOWLABEL_MASK) && !flowlabel) { |
|
flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
|
if (IS_ERR(flowlabel)) |
|
return -EINVAL; |
|
} |
|
if (!(opt->opt_nflen | opt->opt_flen)) |
|
opt = NULL; |
|
} |
|
|
|
if (!opt) { |
|
opt = txopt_get(np); |
|
opt_to_free = opt; |
|
} |
|
if (flowlabel) |
|
opt = fl6_merge_options(&opt_space, flowlabel, opt); |
|
opt = ipv6_fixup_options(&opt_space, opt); |
|
ipc6.opt = 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_common(&fl6)); |
|
|
|
if (ipc6.tclass < 0) |
|
ipc6.tclass = np->tclass; |
|
|
|
fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); |
|
|
|
dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); |
|
if (IS_ERR(dst)) { |
|
err = PTR_ERR(dst); |
|
goto out; |
|
} |
|
|
|
if (ipc6.hlimit < 0) |
|
ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
|
|
|
if (ipc6.dontfrag < 0) |
|
ipc6.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, |
|
ulen, transhdrlen, &ipc6, |
|
&fl6, (struct rt6_info *)dst, |
|
msg->msg_flags); |
|
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); |
|
txopt_put(opt_to_free); |
|
|
|
return err < 0 ? err : len; |
|
|
|
do_confirm: |
|
if (msg->msg_flags & MSG_PROBE) |
|
dst_confirm_neigh(dst, &fl6.daddr); |
|
if (!(msg->msg_flags & MSG_PROBE) || len) |
|
goto back_from_confirm; |
|
err = 0; |
|
goto done; |
|
} |
|
|
|
static int l2tp_ip6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
|
int noblock, int flags, int *addr_len) |
|
{ |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name); |
|
size_t copied = 0; |
|
int err = -EOPNOTSUPP; |
|
struct sk_buff *skb; |
|
|
|
if (flags & MSG_OOB) |
|
goto out; |
|
|
|
if (flags & MSG_ERRQUEUE) |
|
return ipv6_recv_error(sk, msg, len, addr_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_msg(skb, 0, msg, 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; |
|
lsa->l2tp_conn_id = 0; |
|
if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL) |
|
lsa->l2tp_scope_id = inet6_iif(skb); |
|
*addr_len = sizeof(*lsa); |
|
} |
|
|
|
if (np->rxopt.all) |
|
ip6_datagram_recv_ctl(sk, 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 = l2tp_ip6_disconnect, |
|
.ioctl = l2tp_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 = l2tp_ip6_hash, |
|
.unhash = l2tp_ip6_unhash, |
|
.obj_size = sizeof(struct l2tp_ip6_sock), |
|
}; |
|
|
|
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, |
|
.gettstamp = sock_gettstamp, |
|
.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_ioctl = inet6_compat_ioctl, |
|
#endif |
|
}; |
|
|
|
static struct inet_protosw l2tp_ip6_protosw = { |
|
.type = SOCK_DGRAM, |
|
.protocol = IPPROTO_L2TP, |
|
.prot = &l2tp_ip6_prot, |
|
.ops = &l2tp_ip6_ops, |
|
}; |
|
|
|
static struct inet6_protocol l2tp_ip6_protocol __read_mostly = { |
|
.handler = l2tp_ip6_recv, |
|
}; |
|
|
|
static int __init l2tp_ip6_init(void) |
|
{ |
|
int err; |
|
|
|
pr_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 <[email protected]>"); |
|
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); |
|
MODULE_ALIAS_NET_PF_PROTO(PF_INET6, IPPROTO_L2TP);
|
|
|