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Diffstat (limited to 'net/l2tp/l2tp_ip6.c')
-rw-r--r--net/l2tp/l2tp_ip6.c106
1 files changed, 51 insertions, 55 deletions
diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
index d148766f40d1..9dbd801ddb98 100644
--- a/net/l2tp/l2tp_ip6.c
+++ b/net/l2tp/l2tp_ip6.c
@@ -1,6 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * L2TPv3 IP encapsulation support for IPv6
+/* L2TPv3 IP encapsulation support for IPv6
*
* Copyright (c) 2012 Katalix Systems Ltd
*/
@@ -20,8 +19,6 @@
#include <net/icmp.h>
#include <net/udp.h>
#include <net/inet_common.h>
-#include <net/inet_hashtables.h>
-#include <net/inet6_hashtables.h>
#include <net/tcp_states.h>
#include <net/protocol.h>
#include <net/xfrm.h>
@@ -40,7 +37,8 @@ struct l2tp_ip6_sock {
u32 peer_conn_id;
/* ipv6_pinfo has to be the last member of l2tp_ip6_sock, see
- inet6_sk_generic */
+ * inet6_sk_generic
+ */
struct ipv6_pinfo inet6;
};
@@ -64,11 +62,13 @@ static struct sock *__l2tp_ip6_bind_lookup(const struct net *net,
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);
+ int bound_dev_if;
if (!net_eq(sock_net(sk), net))
continue;
- if (sk->sk_bound_dev_if && dif && sk->sk_bound_dev_if != dif)
+ bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
+ if (bound_dev_if && dif && bound_dev_if != dif)
continue;
if (sk_laddr && !ipv6_addr_any(sk_laddr) &&
@@ -133,14 +133,14 @@ static int l2tp_ip6_recv(struct sk_buff *skb)
struct l2tp_session *session;
struct l2tp_tunnel *tunnel = NULL;
struct ipv6hdr *iph;
- int length;
if (!pskb_may_pull(skb, 4))
goto discard;
/* Point to L2TP header */
- optr = ptr = skb->data;
- session_id = ntohl(*((__be32 *) ptr));
+ optr = skb->data;
+ ptr = skb->data;
+ session_id = ntohl(*((__be32 *)ptr));
ptr += 4;
/* RFC3931: L2TP/IP packets have the first 4 bytes containing
@@ -161,19 +161,6 @@ static int l2tp_ip6_recv(struct sk_buff *skb)
if (!tunnel)
goto discard_sess;
- /* Trace packet contents, if enabled */
- if (tunnel->debug & L2TP_MSG_DATA) {
- length = min(32u, skb->len);
- if (!pskb_may_pull(skb, length))
- goto discard_sess;
-
- /* Point to L2TP header */
- optr = ptr = skb->data;
- ptr += 4;
- pr_debug("%s: ip recv\n", tunnel->name);
- print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
- }
-
if (l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr))
goto discard_sess;
@@ -190,7 +177,7 @@ pass_up:
if ((skb->data[0] & 0xc0) != 0xc0)
goto discard;
- tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
+ tunnel_id = ntohl(*(__be32 *)&skb->data[4]);
iph = ipv6_hdr(skb);
read_lock_bh(&l2tp_ip6_lock);
@@ -222,15 +209,31 @@ discard:
return 0;
}
-static int l2tp_ip6_open(struct sock *sk)
+static int l2tp_ip6_hash(struct sock *sk)
{
- /* Prevent autobind. We don't have ports. */
- inet_sk(sk)->inet_num = IPPROTO_L2TP;
+ 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_add_node(sk, &l2tp_ip6_table);
+ 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;
}
@@ -246,7 +249,7 @@ static void l2tp_ip6_close(struct sock *sk, long timeout)
static void l2tp_ip6_destroy_sock(struct sock *sk)
{
- struct l2tp_tunnel *tunnel = sk->sk_user_data;
+ struct l2tp_tunnel *tunnel = l2tp_sk_to_tunnel(sk);
lock_sock(sk);
ip6_flush_pending_frames(sk);
@@ -262,7 +265,7 @@ 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 sockaddr_l2tpip6 *addr = (struct sockaddr_l2tpip6 *)uaddr;
struct net *net = sock_net(sk);
__be32 v4addr = 0;
int bound_dev_if;
@@ -361,8 +364,8 @@ out_unlock:
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 sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)uaddr;
+ struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
struct in6_addr *daddr;
int addr_type;
int rc;
@@ -444,7 +447,7 @@ static int l2tp_ip6_getname(struct socket *sock, struct sockaddr *uaddr,
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;
+ lsa->l2tp_scope_id = READ_ONCE(sk->sk_bound_dev_if);
return sizeof(*lsa);
}
@@ -472,7 +475,7 @@ static int l2tp_ip6_push_pending_frames(struct sock *sk)
int err = 0;
skb = skb_peek(&sk->sk_write_queue);
- if (skb == NULL)
+ if (!skb)
goto out;
transhdr = (__be32 *)skb_transport_header(skb);
@@ -501,22 +504,21 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
struct ipcm6_cookie ipc6;
int addr_len = msg->msg_namelen;
int transhdrlen = 4; /* zero session-id */
- int ulen = len + transhdrlen;
+ int ulen;
int err;
/* Rough check on arithmetic overflow,
- better check is made in ip6_append_data().
+ * better check is made in ip6_append_data().
*/
- if (len > INT_MAX)
+ if (len > INT_MAX - transhdrlen)
return -EMSGSIZE;
+ ulen = len + transhdrlen;
/* Mirror BSD error message compatibility */
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
- /*
- * Get and verify the address.
- */
+ /* Get and verify the address */
memset(&fl6, 0, sizeof(fl6));
fl6.flowi6_mark = sk->sk_mark;
@@ -534,15 +536,14 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
daddr = &lsa->l2tp_addr;
if (np->sndflow) {
fl6.flowlabel = lsa->l2tp_flowinfo & IPV6_FLOWINFO_MASK;
- if (fl6.flowlabel&IPV6_FLOWLABEL_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
+ /* Otherwise it will be difficult to maintain
* sk->sk_dst_cache.
*/
if (sk->sk_state == TCP_ESTABLISHED &&
@@ -562,7 +563,7 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
}
if (fl6.flowi6_oif == 0)
- fl6.flowi6_oif = sk->sk_bound_dev_if;
+ fl6.flowi6_oif = READ_ONCE(sk->sk_bound_dev_if);
if (msg->msg_controllen) {
opt = &opt_space;
@@ -580,7 +581,7 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (IS_ERR(flowlabel))
return -EINVAL;
}
- if (!(opt->opt_nflen|opt->opt_flen))
+ if (!(opt->opt_nflen | opt->opt_flen))
opt = NULL;
}
@@ -608,7 +609,7 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
else if (!fl6.flowi6_oif)
fl6.flowi6_oif = np->ucast_oif;
- security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
+ security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
if (ipc6.tclass < 0)
ipc6.tclass = np->tclass;
@@ -659,7 +660,7 @@ do_confirm:
}
static int l2tp_ip6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
- int noblock, int flags, int *addr_len)
+ int flags, int *addr_len)
{
struct ipv6_pinfo *np = inet6_sk(sk);
DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name);
@@ -673,7 +674,7 @@ static int l2tp_ip6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
if (flags & MSG_ERRQUEUE)
return ipv6_recv_error(sk, msg, len, addr_len);
- skb = skb_recv_datagram(sk, flags, noblock, &err);
+ skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
goto out;
@@ -728,13 +729,9 @@ static struct proto l2tp_ip6_prot = {
.sendmsg = l2tp_ip6_sendmsg,
.recvmsg = l2tp_ip6_recvmsg,
.backlog_rcv = l2tp_ip6_backlog_recv,
- .hash = inet6_hash,
- .unhash = inet_unhash,
+ .hash = l2tp_ip6_hash,
+ .unhash = l2tp_ip6_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 = {
@@ -758,8 +755,7 @@ static const struct proto_ops l2tp_ip6_ops = {
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
#ifdef CONFIG_COMPAT
- .compat_setsockopt = compat_sock_common_setsockopt,
- .compat_getsockopt = compat_sock_common_getsockopt,
+ .compat_ioctl = inet6_compat_ioctl,
#endif
};
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