summaryrefslogtreecommitdiff
path: root/net/l2tp
diff options
context:
space:
mode:
Diffstat (limited to 'net/l2tp')
-rw-r--r--net/l2tp/l2tp_core.c247
-rw-r--r--net/l2tp/l2tp_core.h205
-rw-r--r--net/l2tp/l2tp_debugfs.c34
-rw-r--r--net/l2tp/l2tp_eth.c21
-rw-r--r--net/l2tp/l2tp_ip.c41
-rw-r--r--net/l2tp/l2tp_ip6.c43
-rw-r--r--net/l2tp/l2tp_netlink.c259
-rw-r--r--net/l2tp/l2tp_ppp.c97
8 files changed, 489 insertions, 458 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index 6434d17e6e8e..701fc72ad9f4 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -1,6 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-only
-/*
- * L2TP core.
+/* L2TP core.
*
* Copyright (c) 2008,2009,2010 Katalix Systems Ltd
*
@@ -94,7 +93,7 @@ struct l2tp_skb_cb {
unsigned long expires;
};
-#define L2TP_SKB_CB(skb) ((struct l2tp_skb_cb *) &skb->cb[sizeof(struct inet_skb_parm)])
+#define L2TP_SKB_CB(skb) ((struct l2tp_skb_cb *)&(skb)->cb[sizeof(struct inet_skb_parm)])
static struct workqueue_struct *l2tp_wq;
@@ -102,8 +101,10 @@ static struct workqueue_struct *l2tp_wq;
static unsigned int l2tp_net_id;
struct l2tp_net {
struct list_head l2tp_tunnel_list;
+ /* Lock for write access to l2tp_tunnel_list */
spinlock_t l2tp_tunnel_list_lock;
struct hlist_head l2tp_session_hlist[L2TP_HASH_SIZE_2];
+ /* Lock for write access to l2tp_session_hlist */
spinlock_t l2tp_session_hlist_lock;
};
@@ -134,7 +135,6 @@ static inline struct hlist_head *
l2tp_session_id_hash_2(struct l2tp_net *pn, u32 session_id)
{
return &pn->l2tp_session_hlist[hash_32(session_id, L2TP_HASH_BITS_2)];
-
}
/* Session hash list.
@@ -149,12 +149,51 @@ l2tp_session_id_hash(struct l2tp_tunnel *tunnel, u32 session_id)
return &tunnel->session_hlist[hash_32(session_id, L2TP_HASH_BITS)];
}
-void l2tp_tunnel_free(struct l2tp_tunnel *tunnel)
+static void l2tp_tunnel_free(struct l2tp_tunnel *tunnel)
{
sock_put(tunnel->sock);
/* the tunnel is freed in the socket destructor */
}
-EXPORT_SYMBOL(l2tp_tunnel_free);
+
+static void l2tp_session_free(struct l2tp_session *session)
+{
+ struct l2tp_tunnel *tunnel = session->tunnel;
+
+ if (tunnel) {
+ if (WARN_ON(tunnel->magic != L2TP_TUNNEL_MAGIC))
+ goto out;
+ l2tp_tunnel_dec_refcount(tunnel);
+ }
+
+out:
+ kfree(session);
+}
+
+void l2tp_tunnel_inc_refcount(struct l2tp_tunnel *tunnel)
+{
+ refcount_inc(&tunnel->ref_count);
+}
+EXPORT_SYMBOL_GPL(l2tp_tunnel_inc_refcount);
+
+void l2tp_tunnel_dec_refcount(struct l2tp_tunnel *tunnel)
+{
+ if (refcount_dec_and_test(&tunnel->ref_count))
+ l2tp_tunnel_free(tunnel);
+}
+EXPORT_SYMBOL_GPL(l2tp_tunnel_dec_refcount);
+
+void l2tp_session_inc_refcount(struct l2tp_session *session)
+{
+ refcount_inc(&session->ref_count);
+}
+EXPORT_SYMBOL_GPL(l2tp_session_inc_refcount);
+
+void l2tp_session_dec_refcount(struct l2tp_session *session)
+{
+ if (refcount_dec_and_test(&session->ref_count))
+ l2tp_session_free(session);
+}
+EXPORT_SYMBOL_GPL(l2tp_session_dec_refcount);
/* Lookup a tunnel. A new reference is held on the returned tunnel. */
struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id)
@@ -412,7 +451,7 @@ static void l2tp_recv_dequeue_skb(struct l2tp_session *session, struct sk_buff *
}
/* call private receive handler */
- if (session->recv_skb != NULL)
+ if (session->recv_skb)
(*session->recv_skb)(session, skb, L2TP_SKB_CB(skb)->length);
else
kfree_skb(skb);
@@ -621,8 +660,8 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
int length)
{
struct l2tp_tunnel *tunnel = session->tunnel;
+ u32 ns = 0, nr = 0;
int offset;
- u32 ns, nr;
/* Parse and check optional cookie */
if (session->peer_cookie_len > 0) {
@@ -644,13 +683,12 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
* the control of the LNS. If no sequence numbers present but
* we were expecting them, discard frame.
*/
- ns = nr = 0;
L2TP_SKB_CB(skb)->has_seq = 0;
if (tunnel->version == L2TP_HDR_VER_2) {
if (hdrflags & L2TP_HDRFLAG_S) {
- ns = ntohs(*(__be16 *) ptr);
+ ns = ntohs(*(__be16 *)ptr);
ptr += 2;
- nr = ntohs(*(__be16 *) ptr);
+ nr = ntohs(*(__be16 *)ptr);
ptr += 2;
/* Store L2TP info in the skb */
@@ -662,7 +700,7 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
session->name, ns, nr, session->nr);
}
} else if (session->l2specific_type == L2TP_L2SPECTYPE_DEFAULT) {
- u32 l2h = ntohl(*(__be32 *) ptr);
+ u32 l2h = ntohl(*(__be32 *)ptr);
if (l2h & 0x40000000) {
ns = l2h & 0x00ffffff;
@@ -679,11 +717,11 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
}
if (L2TP_SKB_CB(skb)->has_seq) {
- /* Received a packet with sequence numbers. If we're the LNS,
+ /* Received a packet with sequence numbers. If we're the LAC,
* check if we sre sending sequence numbers and if not,
* configure it so.
*/
- if ((!session->lns_mode) && (!session->send_seq)) {
+ if (!session->lns_mode && !session->send_seq) {
l2tp_info(session, L2TP_MSG_SEQ,
"%s: requested to enable seq numbers by LNS\n",
session->name);
@@ -707,7 +745,7 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
* If we're the LNS and we're sending sequence numbers, the
* LAC is broken. Discard the frame.
*/
- if ((!session->lns_mode) && (session->send_seq)) {
+ if (!session->lns_mode && session->send_seq) {
l2tp_info(session, L2TP_MSG_SEQ,
"%s: requested to disable seq numbers by LNS\n",
session->name);
@@ -770,20 +808,21 @@ discard:
atomic_long_inc(&session->stats.rx_errors);
kfree_skb(skb);
}
-EXPORT_SYMBOL(l2tp_recv_common);
+EXPORT_SYMBOL_GPL(l2tp_recv_common);
/* Drop skbs from the session's reorder_q
*/
-static int l2tp_session_queue_purge(struct l2tp_session *session)
+static void l2tp_session_queue_purge(struct l2tp_session *session)
{
struct sk_buff *skb = NULL;
- BUG_ON(!session);
- BUG_ON(session->magic != L2TP_SESSION_MAGIC);
+
+ if (WARN_ON(session->magic != L2TP_SESSION_MAGIC))
+ return;
+
while ((skb = skb_dequeue(&session->reorder_q))) {
atomic_long_inc(&session->stats.rx_errors);
kfree_skb(skb);
}
- return 0;
}
/* Internal UDP receive frame. Do the real work of receiving an L2TP data frame
@@ -825,10 +864,11 @@ static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb)
}
/* Point to L2TP header */
- optr = ptr = skb->data;
+ optr = skb->data;
+ ptr = skb->data;
/* Get L2TP header flags */
- hdrflags = ntohs(*(__be16 *) ptr);
+ hdrflags = ntohs(*(__be16 *)ptr);
/* Check protocol version */
version = hdrflags & L2TP_HDR_VER_MASK;
@@ -859,14 +899,14 @@ static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb)
ptr += 2;
/* Extract tunnel and session ID */
- tunnel_id = ntohs(*(__be16 *) ptr);
+ tunnel_id = ntohs(*(__be16 *)ptr);
ptr += 2;
- session_id = ntohs(*(__be16 *) ptr);
+ session_id = ntohs(*(__be16 *)ptr);
ptr += 2;
} else {
ptr += 2; /* skip reserved bits */
tunnel_id = tunnel->tunnel_id;
- session_id = ntohl(*(__be32 *) ptr);
+ session_id = ntohl(*(__be32 *)ptr);
ptr += 4;
}
@@ -910,7 +950,7 @@ int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
struct l2tp_tunnel *tunnel;
tunnel = rcu_dereference_sk_user_data(sk);
- if (tunnel == NULL)
+ if (!tunnel)
goto pass_up;
l2tp_dbg(tunnel, L2TP_MSG_DATA, "%s: received %d bytes\n",
@@ -971,13 +1011,13 @@ static int l2tp_build_l2tpv3_header(struct l2tp_session *session, void *buf)
*/
if (tunnel->encap == L2TP_ENCAPTYPE_UDP) {
u16 flags = L2TP_HDR_VER_3;
- *((__be16 *) bufp) = htons(flags);
+ *((__be16 *)bufp) = htons(flags);
bufp += 2;
- *((__be16 *) bufp) = 0;
+ *((__be16 *)bufp) = 0;
bufp += 2;
}
- *((__be32 *) bufp) = htonl(session->peer_session_id);
+ *((__be32 *)bufp) = htonl(session->peer_session_id);
bufp += 4;
if (session->cookie_len) {
memcpy(bufp, &session->cookie[0], session->cookie_len);
@@ -1076,7 +1116,10 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len
}
/* Setup L2TP header */
- session->build_header(session, __skb_push(skb, hdr_len));
+ if (tunnel->version == L2TP_HDR_VER_2)
+ l2tp_build_l2tpv2_header(session, __skb_push(skb, hdr_len));
+ else
+ l2tp_build_l2tpv3_header(session, __skb_push(skb, hdr_len));
/* Reset skb netfilter state */
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
@@ -1121,8 +1164,8 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len
&sk->sk_v6_daddr, udp_len);
else
#endif
- udp_set_csum(sk->sk_no_check_tx, skb, inet->inet_saddr,
- inet->inet_daddr, udp_len);
+ udp_set_csum(sk->sk_no_check_tx, skb, inet->inet_saddr,
+ inet->inet_daddr, udp_len);
break;
case L2TP_ENCAPTYPE_IP:
@@ -1149,7 +1192,7 @@ static void l2tp_tunnel_destruct(struct sock *sk)
{
struct l2tp_tunnel *tunnel = l2tp_tunnel(sk);
- if (tunnel == NULL)
+ if (!tunnel)
goto end;
l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: closing...\n", tunnel->name);
@@ -1179,6 +1222,30 @@ end:
return;
}
+/* Remove an l2tp session from l2tp_core's hash lists. */
+static void l2tp_session_unhash(struct l2tp_session *session)
+{
+ struct l2tp_tunnel *tunnel = session->tunnel;
+
+ /* Remove the session from core hashes */
+ if (tunnel) {
+ /* Remove from the per-tunnel hash */
+ write_lock_bh(&tunnel->hlist_lock);
+ hlist_del_init(&session->hlist);
+ write_unlock_bh(&tunnel->hlist_lock);
+
+ /* For L2TPv3 we have a per-net hash: remove from there, too */
+ if (tunnel->version != L2TP_HDR_VER_2) {
+ struct l2tp_net *pn = l2tp_pernet(tunnel->l2tp_net);
+
+ spin_lock_bh(&pn->l2tp_session_hlist_lock);
+ hlist_del_init_rcu(&session->global_hlist);
+ spin_unlock_bh(&pn->l2tp_session_hlist_lock);
+ synchronize_rcu();
+ }
+ }
+}
+
/* When the tunnel is closed, all the attached sessions need to go too.
*/
static void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel)
@@ -1188,8 +1255,6 @@ static void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel)
struct hlist_node *tmp;
struct l2tp_session *session;
- BUG_ON(tunnel == NULL);
-
l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: closing all sessions...\n",
tunnel->name);
@@ -1210,10 +1275,10 @@ again:
write_unlock_bh(&tunnel->hlist_lock);
- __l2tp_session_unhash(session);
+ l2tp_session_unhash(session);
l2tp_session_queue_purge(session);
- if (session->session_close != NULL)
+ if (session->session_close)
(*session->session_close)(session);
l2tp_session_dec_refcount(session);
@@ -1284,10 +1349,10 @@ static void l2tp_tunnel_del_work(struct work_struct *work)
* exit hook.
*/
static int l2tp_tunnel_sock_create(struct net *net,
- u32 tunnel_id,
- u32 peer_tunnel_id,
- struct l2tp_tunnel_cfg *cfg,
- struct socket **sockp)
+ u32 tunnel_id,
+ u32 peer_tunnel_id,
+ struct l2tp_tunnel_cfg *cfg,
+ struct socket **sockp)
{
int err = -EINVAL;
struct socket *sock = NULL;
@@ -1305,9 +1370,9 @@ static int l2tp_tunnel_sock_create(struct net *net,
memcpy(&udp_conf.peer_ip6, cfg->peer_ip6,
sizeof(udp_conf.peer_ip6));
udp_conf.use_udp6_tx_checksums =
- ! cfg->udp6_zero_tx_checksums;
+ !cfg->udp6_zero_tx_checksums;
udp_conf.use_udp6_rx_checksums =
- ! cfg->udp6_zero_rx_checksums;
+ !cfg->udp6_zero_rx_checksums;
} else
#endif
{
@@ -1332,7 +1397,7 @@ static int l2tp_tunnel_sock_create(struct net *net,
struct sockaddr_l2tpip6 ip6_addr = {0};
err = sock_create_kern(net, AF_INET6, SOCK_DGRAM,
- IPPROTO_L2TP, &sock);
+ IPPROTO_L2TP, &sock);
if (err < 0)
goto out;
@@ -1340,7 +1405,7 @@ static int l2tp_tunnel_sock_create(struct net *net,
memcpy(&ip6_addr.l2tp_addr, cfg->local_ip6,
sizeof(ip6_addr.l2tp_addr));
ip6_addr.l2tp_conn_id = tunnel_id;
- err = kernel_bind(sock, (struct sockaddr *) &ip6_addr,
+ err = kernel_bind(sock, (struct sockaddr *)&ip6_addr,
sizeof(ip6_addr));
if (err < 0)
goto out;
@@ -1350,7 +1415,7 @@ static int l2tp_tunnel_sock_create(struct net *net,
sizeof(ip6_addr.l2tp_addr));
ip6_addr.l2tp_conn_id = peer_tunnel_id;
err = kernel_connect(sock,
- (struct sockaddr *) &ip6_addr,
+ (struct sockaddr *)&ip6_addr,
sizeof(ip6_addr), 0);
if (err < 0)
goto out;
@@ -1360,14 +1425,14 @@ static int l2tp_tunnel_sock_create(struct net *net,
struct sockaddr_l2tpip ip_addr = {0};
err = sock_create_kern(net, AF_INET, SOCK_DGRAM,
- IPPROTO_L2TP, &sock);
+ IPPROTO_L2TP, &sock);
if (err < 0)
goto out;
ip_addr.l2tp_family = AF_INET;
ip_addr.l2tp_addr = cfg->local_ip;
ip_addr.l2tp_conn_id = tunnel_id;
- err = kernel_bind(sock, (struct sockaddr *) &ip_addr,
+ err = kernel_bind(sock, (struct sockaddr *)&ip_addr,
sizeof(ip_addr));
if (err < 0)
goto out;
@@ -1375,7 +1440,7 @@ static int l2tp_tunnel_sock_create(struct net *net,
ip_addr.l2tp_family = AF_INET;
ip_addr.l2tp_addr = cfg->peer_ip;
ip_addr.l2tp_conn_id = peer_tunnel_id;
- err = kernel_connect(sock, (struct sockaddr *) &ip_addr,
+ err = kernel_connect(sock, (struct sockaddr *)&ip_addr,
sizeof(ip_addr), 0);
if (err < 0)
goto out;
@@ -1388,7 +1453,7 @@ static int l2tp_tunnel_sock_create(struct net *net,
out:
*sockp = sock;
- if ((err < 0) && sock) {
+ if (err < 0 && sock) {
kernel_sock_shutdown(sock, SHUT_RDWR);
sock_release(sock);
*sockp = NULL;
@@ -1399,17 +1464,18 @@ out:
static struct lock_class_key l2tp_socket_class;
-int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg, struct l2tp_tunnel **tunnelp)
+int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32 peer_tunnel_id,
+ struct l2tp_tunnel_cfg *cfg, struct l2tp_tunnel **tunnelp)
{
struct l2tp_tunnel *tunnel = NULL;
int err;
enum l2tp_encap_type encap = L2TP_ENCAPTYPE_UDP;
- if (cfg != NULL)
+ if (cfg)
encap = cfg->encap;
- tunnel = kzalloc(sizeof(struct l2tp_tunnel), GFP_KERNEL);
- if (tunnel == NULL) {
+ tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL);
+ if (!tunnel) {
err = -ENOMEM;
goto err;
}
@@ -1424,7 +1490,7 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32
rwlock_init(&tunnel->hlist_lock);
tunnel->acpt_newsess = true;
- if (cfg != NULL)
+ if (cfg)
tunnel->debug = cfg->debug;
tunnel->encap = encap;
@@ -1557,67 +1623,17 @@ void l2tp_tunnel_delete(struct l2tp_tunnel *tunnel)
}
EXPORT_SYMBOL_GPL(l2tp_tunnel_delete);
-/* Really kill the session.
- */
-void l2tp_session_free(struct l2tp_session *session)
-{
- struct l2tp_tunnel *tunnel = session->tunnel;
-
- BUG_ON(refcount_read(&session->ref_count) != 0);
-
- if (tunnel) {
- BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
- l2tp_tunnel_dec_refcount(tunnel);
- }
-
- kfree(session);
-}
-EXPORT_SYMBOL_GPL(l2tp_session_free);
-
-/* Remove an l2tp session from l2tp_core's hash lists.
- * Provides a tidyup interface for pseudowire code which can't just route all
- * shutdown via. l2tp_session_delete and a pseudowire-specific session_close
- * callback.
- */
-void __l2tp_session_unhash(struct l2tp_session *session)
-{
- struct l2tp_tunnel *tunnel = session->tunnel;
-
- /* Remove the session from core hashes */
- if (tunnel) {
- /* Remove from the per-tunnel hash */
- write_lock_bh(&tunnel->hlist_lock);
- hlist_del_init(&session->hlist);
- write_unlock_bh(&tunnel->hlist_lock);
-
- /* For L2TPv3 we have a per-net hash: remove from there, too */
- if (tunnel->version != L2TP_HDR_VER_2) {
- struct l2tp_net *pn = l2tp_pernet(tunnel->l2tp_net);
- spin_lock_bh(&pn->l2tp_session_hlist_lock);
- hlist_del_init_rcu(&session->global_hlist);
- spin_unlock_bh(&pn->l2tp_session_hlist_lock);
- synchronize_rcu();
- }
- }
-}
-EXPORT_SYMBOL_GPL(__l2tp_session_unhash);
-
-/* This function is used by the netlink SESSION_DELETE command and by
- pseudowire modules.
- */
-int l2tp_session_delete(struct l2tp_session *session)
+void l2tp_session_delete(struct l2tp_session *session)
{
if (test_and_set_bit(0, &session->dead))
- return 0;
+ return;
- __l2tp_session_unhash(session);
+ l2tp_session_unhash(session);
l2tp_session_queue_purge(session);
- if (session->session_close != NULL)
+ if (session->session_close)
(*session->session_close)(session);
l2tp_session_dec_refcount(session);
-
- return 0;
}
EXPORT_SYMBOL_GPL(l2tp_session_delete);
@@ -1636,16 +1652,16 @@ void l2tp_session_set_header_len(struct l2tp_session *session, int version)
if (session->tunnel->encap == L2TP_ENCAPTYPE_UDP)
session->hdr_len += 4;
}
-
}
EXPORT_SYMBOL_GPL(l2tp_session_set_header_len);
-struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunnel, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
+struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunnel, u32 session_id,
+ u32 peer_session_id, struct l2tp_session_cfg *cfg)
{
struct l2tp_session *session;
- session = kzalloc(sizeof(struct l2tp_session) + priv_size, GFP_KERNEL);
- if (session != NULL) {
+ session = kzalloc(sizeof(*session) + priv_size, GFP_KERNEL);
+ if (session) {
session->magic = L2TP_SESSION_MAGIC;
session->tunnel = tunnel;
@@ -1687,11 +1703,6 @@ struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunn
memcpy(&session->peer_cookie[0], &cfg->peer_cookie[0], cfg->peer_cookie_len);
}
- if (tunnel->version == L2TP_HDR_VER_2)
- session->build_header = l2tp_build_l2tpv2_header;
- else
- session->build_header = l2tp_build_l2tpv3_header;
-
l2tp_session_set_header_len(session, tunnel->version);
refcount_set(&session->ref_count, 1);
diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h
index 10cf7c3dcbb3..3468d6b177a0 100644
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -1,6 +1,5 @@
/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * L2TP internal definitions.
+/* L2TP internal definitions.
*
* Copyright (c) 2008,2009 Katalix Systems Ltd
*/
@@ -16,17 +15,17 @@
#include <net/xfrm.h>
#endif
-/* Just some random numbers */
+/* Random numbers used for internal consistency checks of tunnel and session structures */
#define L2TP_TUNNEL_MAGIC 0x42114DDA
#define L2TP_SESSION_MAGIC 0x0C04EB7D
-/* Per tunnel, session hash table size */
+/* Per tunnel session hash table size */
#define L2TP_HASH_BITS 4
-#define L2TP_HASH_SIZE (1 << L2TP_HASH_BITS)
+#define L2TP_HASH_SIZE BIT(L2TP_HASH_BITS)
-/* System-wide, session hash table size */
+/* System-wide session hash table size */
#define L2TP_HASH_BITS_2 8
-#define L2TP_HASH_SIZE_2 (1 << L2TP_HASH_BITS_2)
+#define L2TP_HASH_SIZE_2 BIT(L2TP_HASH_BITS_2)
struct sk_buff;
@@ -44,37 +43,34 @@ struct l2tp_stats {
struct l2tp_tunnel;
-/* Describes a session. Contains information to determine incoming
- * packets and transmit outgoing ones.
- */
+/* L2TP session configuration */
struct l2tp_session_cfg {
enum l2tp_pwtype pw_type;
- unsigned int recv_seq:1; /* expect receive packets with
- * sequence numbers? */
- unsigned int send_seq:1; /* send packets with sequence
- * numbers? */
- unsigned int lns_mode:1; /* behave as LNS? LAC enables
- * sequence numbers under
- * control of LNS. */
- int debug; /* bitmask of debug message
- * categories */
+ unsigned int recv_seq:1; /* expect receive packets with sequence numbers? */
+ unsigned int send_seq:1; /* send packets with sequence numbers? */
+ unsigned int lns_mode:1; /* behave as LNS?
+ * LAC enables sequence numbers under LNS control.
+ */
+ int debug; /* bitmask of debug message categories */
u16 l2specific_type; /* Layer 2 specific type */
u8 cookie[8]; /* optional cookie */
int cookie_len; /* 0, 4 or 8 bytes */
u8 peer_cookie[8]; /* peer's cookie */
int peer_cookie_len; /* 0, 4 or 8 bytes */
- int reorder_timeout; /* configured reorder timeout
- * (in jiffies) */
+ int reorder_timeout; /* configured reorder timeout (in jiffies) */
char *ifname;
};
+/* Represents a session (pseudowire) instance.
+ * Tracks runtime state including cookies, dataplane packet sequencing, and IO statistics.
+ * Is linked into a per-tunnel session hashlist; and in the case of an L2TPv3 session into
+ * an additional per-net ("global") hashlist.
+ */
struct l2tp_session {
- int magic; /* should be
- * L2TP_SESSION_MAGIC */
+ int magic; /* should be L2TP_SESSION_MAGIC */
long dead;
- struct l2tp_tunnel *tunnel; /* back pointer to tunnel
- * context */
+ struct l2tp_tunnel *tunnel; /* back pointer to tunnel context */
u32 session_id;
u32 peer_session_id;
u8 cookie[8];
@@ -89,42 +85,53 @@ struct l2tp_session {
u32 nr_max; /* max NR. Depends on tunnel */
u32 nr_window_size; /* NR window size */
u32 nr_oos; /* NR of last OOS packet */
- int nr_oos_count; /* For OOS recovery */
+ int nr_oos_count; /* for OOS recovery */
int nr_oos_count_max;
- struct hlist_node hlist; /* Hash list node */
+ struct hlist_node hlist; /* hash list node */
refcount_t ref_count;
char name[32]; /* for logging */
char ifname[IFNAMSIZ];
- unsigned int recv_seq:1; /* expect receive packets with
- * sequence numbers? */
- unsigned int send_seq:1; /* send packets with sequence
- * numbers? */
- unsigned int lns_mode:1; /* behave as LNS? LAC enables
- * sequence numbers under
- * control of LNS. */
- int debug; /* bitmask of debug message
- * categories */
- int reorder_timeout; /* configured reorder timeout
- * (in jiffies) */
+ unsigned int recv_seq:1; /* expect receive packets with sequence numbers? */
+ unsigned int send_seq:1; /* send packets with sequence numbers? */
+ unsigned int lns_mode:1; /* behave as LNS?
+ * LAC enables sequence numbers under LNS control.
+ */
+ int debug; /* bitmask of debug message categories */
+ int reorder_timeout; /* configured reorder timeout (in jiffies) */
int reorder_skip; /* set if skip to next nr */
enum l2tp_pwtype pwtype;
struct l2tp_stats stats;
- struct hlist_node global_hlist; /* Global hash list node */
+ struct hlist_node global_hlist; /* global hash list node */
- int (*build_header)(struct l2tp_session *session, void *buf);
+ /* Session receive handler for data packets.
+ * Each pseudowire implementation should implement this callback in order to
+ * handle incoming packets. Packets are passed to the pseudowire handler after
+ * reordering, if data sequence numbers are enabled for the session.
+ */
void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len);
+
+ /* Session close handler.
+ * Each pseudowire implementation may implement this callback in order to carry
+ * out pseudowire-specific shutdown actions.
+ * The callback is called by core after unhashing the session and purging its
+ * reorder queue.
+ */
void (*session_close)(struct l2tp_session *session);
+
+ /* Session show handler.
+ * Pseudowire-specific implementation of debugfs session rendering.
+ * The callback is called by l2tp_debugfs.c after rendering core session
+ * information.
+ */
void (*show)(struct seq_file *m, void *priv);
- u8 priv[]; /* private data */
+
+ u8 priv[]; /* private data */
};
-/* Describes the tunnel. It contains info to track all the associated
- * sessions so incoming packets can be sorted out
- */
+/* L2TP tunnel configuration */
struct l2tp_tunnel_cfg {
- int debug; /* bitmask of debug message
- * categories */
+ int debug; /* bitmask of debug message categories */
enum l2tp_encap_type encap;
/* Used only for kernel-created sockets */
@@ -141,6 +148,12 @@ struct l2tp_tunnel_cfg {
udp6_zero_rx_checksums:1;
};
+/* Represents a tunnel instance.
+ * Tracks runtime state including IO statistics.
+ * Holds the tunnel socket (either passed from userspace or directly created by the kernel).
+ * Maintains a hashlist of sessions belonging to the tunnel instance.
+ * Is linked into a per-net list of tunnels.
+ */
struct l2tp_tunnel {
int magic; /* Should be L2TP_TUNNEL_MAGIC */
@@ -148,40 +161,51 @@ struct l2tp_tunnel {
struct rcu_head rcu;
rwlock_t hlist_lock; /* protect session_hlist */
- bool acpt_newsess; /* Indicates whether this
- * tunnel accepts new sessions.
- * Protected by hlist_lock.
+ bool acpt_newsess; /* indicates whether this tunnel accepts
+ * new sessions. Protected by hlist_lock.
*/
struct hlist_head session_hlist[L2TP_HASH_SIZE];
- /* hashed list of sessions,
- * hashed by id */
+ /* hashed list of sessions, hashed by id */
u32 tunnel_id;
u32 peer_tunnel_id;
int version; /* 2=>L2TPv2, 3=>L2TPv3 */
char name[20]; /* for logging */
- int debug; /* bitmask of debug message
- * categories */
+ int debug; /* bitmask of debug message categories */
enum l2tp_encap_type encap;
struct l2tp_stats stats;
- struct list_head list; /* Keep a list of all tunnels */
+ struct list_head list; /* list node on per-namespace list of tunnels */
struct net *l2tp_net; /* the net we belong to */
refcount_t ref_count;
- void (*old_sk_destruct)(struct sock *);
- struct sock *sock; /* Parent socket */
- int fd; /* Parent fd, if tunnel socket
- * was created by userspace */
+ void (*old_sk_destruct)(struct sock *sk);
+ struct sock *sock; /* parent socket */
+ int fd; /* parent fd, if tunnel socket was created
+ * by userspace
+ */
struct work_struct del_work;
};
+/* Pseudowire ops callbacks for use with the l2tp genetlink interface */
struct l2tp_nl_cmd_ops {
+ /* The pseudowire session create callback is responsible for creating a session
+ * instance for a specific pseudowire type.
+ * It must call l2tp_session_create and l2tp_session_register to register the
+ * session instance, as well as carry out any pseudowire-specific initialisation.
+ * It must return >= 0 on success, or an appropriate negative errno value on failure.
+ */
int (*session_create)(struct net *net, struct l2tp_tunnel *tunnel,
u32 session_id, u32 peer_session_id,
struct l2tp_session_cfg *cfg);
- int (*session_delete)(struct l2tp_session *session);
+
+ /* The pseudowire session delete callback is responsible for initiating the deletion
+ * of a session instance.
+ * It must call l2tp_session_delete, as well as carry out any pseudowire-specific
+ * teardown actions.
+ */
+ void (*session_delete)(struct l2tp_session *session);
};
static inline void *l2tp_session_priv(struct l2tp_session *session)
@@ -189,73 +213,68 @@ static inline void *l2tp_session_priv(struct l2tp_session *session)
return &session->priv[0];
}
+/* Tunnel and session refcounts */
+void l2tp_tunnel_inc_refcount(struct l2tp_tunnel *tunnel);
+void l2tp_tunnel_dec_refcount(struct l2tp_tunnel *tunnel);
+void l2tp_session_inc_refcount(struct l2tp_session *session);
+void l2tp_session_dec_refcount(struct l2tp_session *session);
+
+/* Tunnel and session lookup.
+ * These functions take a reference on the instances they return, so
+ * the caller must ensure that the reference is dropped appropriately.
+ */
struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id);
struct l2tp_tunnel *l2tp_tunnel_get_nth(const struct net *net, int nth);
struct l2tp_session *l2tp_tunnel_get_session(struct l2tp_tunnel *tunnel,
u32 session_id);
-void l2tp_tunnel_free(struct l2tp_tunnel *tunnel);
-
struct l2tp_session *l2tp_session_get(const struct net *net, u32 session_id);
struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth);
struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net,
const char *ifname);
+/* Tunnel and session lifetime management.
+ * Creation of a new instance is a two-step process: create, then register.
+ * Destruction is triggered using the *_delete functions, and completes asynchronously.
+ */
int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id,
u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg,
struct l2tp_tunnel **tunnelp);
int l2tp_tunnel_register(struct l2tp_tunnel *tunnel, struct net *net,
struct l2tp_tunnel_cfg *cfg);
-
void l2tp_tunnel_delete(struct l2tp_tunnel *tunnel);
+
struct l2tp_session *l2tp_session_create(int priv_size,
struct l2tp_tunnel *tunnel,
u32 session_id, u32 peer_session_id,
struct l2tp_session_cfg *cfg);
int l2tp_session_register(struct l2tp_session *session,
struct l2tp_tunnel *tunnel);
+void l2tp_session_delete(struct l2tp_session *session);
-void __l2tp_session_unhash(struct l2tp_session *session);
-int l2tp_session_delete(struct l2tp_session *session);
-void l2tp_session_free(struct l2tp_session *session);
+/* Receive path helpers. If data sequencing is enabled for the session these
+ * functions handle queuing and reordering prior to passing packets to the
+ * pseudowire code to be passed to userspace.
+ */
void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
unsigned char *ptr, unsigned char *optr, u16 hdrflags,
int length);
int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb);
-void l2tp_session_set_header_len(struct l2tp_session *session, int version);
+/* Transmit path helpers for sending packets over the tunnel socket. */
+void l2tp_session_set_header_len(struct l2tp_session *session, int version);
int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb,
int hdr_len);
-int l2tp_nl_register_ops(enum l2tp_pwtype pw_type,
- const struct l2tp_nl_cmd_ops *ops);
-void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type);
-int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg);
-
-static inline void l2tp_tunnel_inc_refcount(struct l2tp_tunnel *tunnel)
-{
- refcount_inc(&tunnel->ref_count);
-}
-
-static inline void l2tp_tunnel_dec_refcount(struct l2tp_tunnel *tunnel)
-{
- if (refcount_dec_and_test(&tunnel->ref_count))
- l2tp_tunnel_free(tunnel);
-}
-
-/* Session reference counts. Incremented when code obtains a reference
- * to a session.
+/* Pseudowire management.
+ * Pseudowires should register with l2tp core on module init, and unregister
+ * on module exit.
*/
-static inline void l2tp_session_inc_refcount(struct l2tp_session *session)
-{
- refcount_inc(&session->ref_count);
-}
+int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops);
+void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type);
-static inline void l2tp_session_dec_refcount(struct l2tp_session *session)
-{
- if (refcount_dec_and_test(&session->ref_count))
- l2tp_session_free(session);
-}
+/* IOCTL helper for IP encap modules. */
+int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg);
static inline int l2tp_get_l2specific_len(struct l2tp_session *session)
{
diff --git a/net/l2tp/l2tp_debugfs.c b/net/l2tp/l2tp_debugfs.c
index 35bb4f3bdbe0..96cb9601c21b 100644
--- a/net/l2tp/l2tp_debugfs.c
+++ b/net/l2tp/l2tp_debugfs.c
@@ -1,6 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * L2TP subsystem debugfs
+/* L2TP subsystem debugfs
*
* Copyright (c) 2010 Katalix Systems Ltd
*/
@@ -59,11 +58,10 @@ static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd)
pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx);
pd->session_idx++;
- if (pd->session == NULL) {
+ if (!pd->session) {
pd->session_idx = 0;
l2tp_dfs_next_tunnel(pd);
}
-
}
static void *l2tp_dfs_seq_start(struct seq_file *m, loff_t *offs)
@@ -74,23 +72,25 @@ static void *l2tp_dfs_seq_start(struct seq_file *m, loff_t *offs)
if (!pos)
goto out;
- BUG_ON(m->private == NULL);
+ if (WARN_ON(!m->private)) {
+ pd = NULL;
+ goto out;
+ }
pd = m->private;
- if (pd->tunnel == NULL)
+ if (!pd->tunnel)
l2tp_dfs_next_tunnel(pd);
else
l2tp_dfs_next_session(pd);
/* NULL tunnel and session indicates end of list */
- if ((pd->tunnel == NULL) && (pd->session == NULL))
+ if (!pd->tunnel && !pd->session)
pd = NULL;
out:
return pd;
}
-
static void *l2tp_dfs_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
(*pos)++;
@@ -148,11 +148,13 @@ static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v)
const struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
seq_printf(m, " from %pI6c to %pI6c\n",
- &np->saddr, &tunnel->sock->sk_v6_daddr);
- } else
+ &np->saddr, &tunnel->sock->sk_v6_daddr);
+ }
#endif
- seq_printf(m, " from %pI4 to %pI4\n",
- &inet->inet_saddr, &inet->inet_daddr);
+ if (tunnel->sock->sk_family == AF_INET)
+ seq_printf(m, " from %pI4 to %pI4\n",
+ &inet->inet_saddr, &inet->inet_daddr);
+
if (tunnel->encap == L2TP_ENCAPTYPE_UDP)
seq_printf(m, " source port %hu, dest port %hu\n",
ntohs(inet->inet_sport), ntohs(inet->inet_dport));
@@ -202,7 +204,7 @@ static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
seq_printf(m, "%02x%02x%02x%02x",
session->cookie[4], session->cookie[5],
session->cookie[6], session->cookie[7]);
- seq_printf(m, "\n");
+ seq_puts(m, "\n");
}
if (session->peer_cookie_len) {
seq_printf(m, " peer cookie %02x%02x%02x%02x",
@@ -212,7 +214,7 @@ static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
seq_printf(m, "%02x%02x%02x%02x",
session->peer_cookie[4], session->peer_cookie[5],
session->peer_cookie[6], session->peer_cookie[7]);
- seq_printf(m, "\n");
+ seq_puts(m, "\n");
}
seq_printf(m, " %hu/%hu tx %ld/%ld/%ld rx %ld/%ld/%ld\n",
@@ -224,7 +226,7 @@ static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
atomic_long_read(&session->stats.rx_bytes),
atomic_long_read(&session->stats.rx_errors));
- if (session->show != NULL)
+ if (session->show)
session->show(m, session);
}
@@ -271,7 +273,7 @@ static int l2tp_dfs_seq_open(struct inode *inode, struct file *file)
int rc = -ENOMEM;
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
- if (pd == NULL)
+ if (!pd)
goto out;
/* Derive the network namespace from the pid opening the
diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index fd5ac2788e45..7ed2b4eced94 100644
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -1,6 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * L2TPv3 ethernet pseudowire driver
+/* L2TPv3 ethernet pseudowire driver
*
* Copyright (c) 2008,2009,2010 Katalix Systems Ltd
*/
@@ -51,7 +50,6 @@ struct l2tp_eth_sess {
struct net_device __rcu *dev;
};
-
static int l2tp_eth_dev_init(struct net_device *dev)
{
eth_hw_addr_random(dev);
@@ -73,7 +71,7 @@ static void l2tp_eth_dev_uninit(struct net_device *dev)
*/
}
-static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct l2tp_eth *priv = netdev_priv(dev);
struct l2tp_session *session = priv->session;
@@ -94,13 +92,12 @@ static void l2tp_eth_get_stats64(struct net_device *dev,
{
struct l2tp_eth *priv = netdev_priv(dev);
- stats->tx_bytes = (unsigned long) atomic_long_read(&priv->tx_bytes);
- stats->tx_packets = (unsigned long) atomic_long_read(&priv->tx_packets);
- stats->tx_dropped = (unsigned long) atomic_long_read(&priv->tx_dropped);
- stats->rx_bytes = (unsigned long) atomic_long_read(&priv->rx_bytes);
- stats->rx_packets = (unsigned long) atomic_long_read(&priv->rx_packets);
- stats->rx_errors = (unsigned long) atomic_long_read(&priv->rx_errors);
-
+ stats->tx_bytes = (unsigned long)atomic_long_read(&priv->tx_bytes);
+ stats->tx_packets = (unsigned long)atomic_long_read(&priv->tx_packets);
+ stats->tx_dropped = (unsigned long)atomic_long_read(&priv->tx_dropped);
+ stats->rx_bytes = (unsigned long)atomic_long_read(&priv->rx_bytes);
+ stats->rx_packets = (unsigned long)atomic_long_read(&priv->rx_packets);
+ stats->rx_errors = (unsigned long)atomic_long_read(&priv->rx_errors);
}
static const struct net_device_ops l2tp_eth_netdev_ops = {
@@ -348,13 +345,11 @@ err:
return rc;
}
-
static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
.session_create = l2tp_eth_create,
.session_delete = l2tp_session_delete,
};
-
static int __init l2tp_eth_init(void)
{
int err = 0;
diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
index 955662a6dee7..df2a35b5714a 100644
--- a/net/l2tp/l2tp_ip.c
+++ b/net/l2tp/l2tp_ip.c
@@ -1,6 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * L2TPv3 IP encapsulation support
+/* L2TPv3 IP encapsulation support
*
* Copyright (c) 2008,2009,2010 Katalix Systems Ltd
*/
@@ -125,8 +124,9 @@ static int l2tp_ip_recv(struct sk_buff *skb)
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
@@ -154,7 +154,8 @@ static int l2tp_ip_recv(struct sk_buff *skb)
goto discard_sess;
/* Point to L2TP header */
- optr = ptr = skb->data;
+ optr = skb->data;
+ ptr = skb->data;
ptr += 4;
pr_debug("%s: ip recv\n", tunnel->name);
print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
@@ -176,7 +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 = (struct iphdr *)skb_network_header(skb);
read_lock_bh(&l2tp_ip_lock);
@@ -260,7 +261,7 @@ static void l2tp_ip_destroy_sock(struct sock *sk)
static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
struct inet_sock *inet = inet_sk(sk);
- struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr;
+ struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *)uaddr;
struct net *net = sock_net(sk);
int ret;
int chk_addr_ret;
@@ -285,8 +286,10 @@ static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
goto out;
- if (addr->l2tp_addr.s_addr)
- inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr;
+ if (addr->l2tp_addr.s_addr) {
+ inet->inet_rcv_saddr = addr->l2tp_addr.s_addr;
+ inet->inet_saddr = addr->l2tp_addr.s_addr;
+ }
if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
inet->inet_saddr = 0; /* Use device */
@@ -316,7 +319,7 @@ out:
static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
- struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr;
+ struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr;
int rc;
if (addr_len < sizeof(*lsa))
@@ -375,6 +378,7 @@ static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr,
lsa->l2tp_addr.s_addr = inet->inet_daddr;
} else {
__be32 addr = inet->inet_rcv_saddr;
+
if (!addr)
addr = inet->inet_saddr;
lsa->l2tp_conn_id = lsk->conn_id;
@@ -422,6 +426,7 @@ static int l2tp_ip_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
/* Get and verify the address. */
if (msg->msg_name) {
DECLARE_SOCKADDR(struct sockaddr_l2tpip *, lip, msg->msg_name);
+
rc = -EINVAL;
if (msg->msg_namelen < sizeof(*lip))
goto out;
@@ -456,7 +461,7 @@ static int l2tp_ip_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
skb_reset_transport_header(skb);
/* Insert 0 session_id */
- *((__be32 *) skb_put(skb, 4)) = 0;
+ *((__be32 *)skb_put(skb, 4)) = 0;
/* Copy user data into skb */
rc = memcpy_from_msg(skb_put(skb, len), msg, len);
@@ -467,10 +472,10 @@ static int l2tp_ip_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
fl4 = &inet->cork.fl.u.ip4;
if (connected)
- rt = (struct rtable *) __sk_dst_check(sk, 0);
+ rt = (struct rtable *)__sk_dst_check(sk, 0);
rcu_read_lock();
- if (rt == NULL) {
+ if (!rt) {
const struct ip_options_rcu *inet_opt;
inet_opt = rcu_dereference(inet->inet_opt);
@@ -592,7 +597,7 @@ int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg)
return put_user(amount, (int __user *)arg);
}
-EXPORT_SYMBOL(l2tp_ioctl);
+EXPORT_SYMBOL_GPL(l2tp_ioctl);
static struct proto l2tp_ip_prot = {
.name = "L2TP/IP",
@@ -612,10 +617,6 @@ static struct proto l2tp_ip_prot = {
.hash = l2tp_ip_hash,
.unhash = l2tp_ip_unhash,
.obj_size = sizeof(struct l2tp_ip_sock),
-#ifdef CONFIG_COMPAT
- .compat_setsockopt = compat_ip_setsockopt,
- .compat_getsockopt = compat_ip_getsockopt,
-#endif
};
static const struct proto_ops l2tp_ip_ops = {
@@ -638,10 +639,6 @@ static const struct proto_ops l2tp_ip_ops = {
.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_ip_protosw = {
diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
index 526ed2c24dd5..bc757bc7e264 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
*/
@@ -38,7 +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;
};
@@ -137,8 +137,9 @@ static int l2tp_ip6_recv(struct sk_buff *skb)
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
@@ -166,7 +167,8 @@ static int l2tp_ip6_recv(struct sk_buff *skb)
goto discard_sess;
/* Point to L2TP header */
- optr = ptr = skb->data;
+ optr = skb->data;
+ ptr = skb->data;
ptr += 4;
pr_debug("%s: ip recv\n", tunnel->name);
print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
@@ -188,7 +190,7 @@ 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);
@@ -276,7 +278,7 @@ 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;
@@ -375,8 +377,8 @@ 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;
@@ -486,7 +488,7 @@ 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);
@@ -519,7 +521,7 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
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)
return -EMSGSIZE;
@@ -528,9 +530,7 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
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;
@@ -548,15 +548,14 @@ 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 &&
@@ -594,7 +593,7 @@ 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;
}
@@ -745,10 +744,6 @@ static struct proto l2tp_ip6_prot = {
.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 = {
@@ -773,8 +768,6 @@ static const struct proto_ops l2tp_ip6_ops = {
.sendpage = sock_no_sendpage,
#ifdef CONFIG_COMPAT
.compat_ioctl = inet6_compat_ioctl,
- .compat_setsockopt = compat_sock_common_setsockopt,
- .compat_getsockopt = compat_sock_common_getsockopt,
#endif
};
diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
index ebb381c3f1b9..def78eebca4c 100644
--- a/net/l2tp/l2tp_netlink.c
+++ b/net/l2tp/l2tp_netlink.c
@@ -1,6 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-only
-/*
- * L2TP netlink layer, for management
+/* L2TP netlink layer, for management
*
* Copyright (c) 2008,2009,2010 Katalix Systems Ltd
*
@@ -27,7 +26,6 @@
#include "l2tp_core.h"
-
static struct genl_family l2tp_nl_family;
static const struct genl_multicast_group l2tp_multicast_group[] = {
@@ -157,81 +155,82 @@ static int l2tp_session_notify(struct genl_family *family,
return ret;
}
+static int l2tp_nl_cmd_tunnel_create_get_addr(struct nlattr **attrs, struct l2tp_tunnel_cfg *cfg)
+{
+ if (attrs[L2TP_ATTR_UDP_SPORT])
+ cfg->local_udp_port = nla_get_u16(attrs[L2TP_ATTR_UDP_SPORT]);
+ if (attrs[L2TP_ATTR_UDP_DPORT])
+ cfg->peer_udp_port = nla_get_u16(attrs[L2TP_ATTR_UDP_DPORT]);
+ cfg->use_udp_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_CSUM]);
+
+ /* Must have either AF_INET or AF_INET6 address for source and destination */
+#if IS_ENABLED(CONFIG_IPV6)
+ if (attrs[L2TP_ATTR_IP6_SADDR] && attrs[L2TP_ATTR_IP6_DADDR]) {
+ cfg->local_ip6 = nla_data(attrs[L2TP_ATTR_IP6_SADDR]);
+ cfg->peer_ip6 = nla_data(attrs[L2TP_ATTR_IP6_DADDR]);
+ cfg->udp6_zero_tx_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
+ cfg->udp6_zero_rx_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
+ return 0;
+ }
+#endif
+ if (attrs[L2TP_ATTR_IP_SADDR] && attrs[L2TP_ATTR_IP_DADDR]) {
+ cfg->local_ip.s_addr = nla_get_in_addr(attrs[L2TP_ATTR_IP_SADDR]);
+ cfg->peer_ip.s_addr = nla_get_in_addr(attrs[L2TP_ATTR_IP_DADDR]);
+ return 0;
+ }
+ return -EINVAL;
+}
+
static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
{
u32 tunnel_id;
u32 peer_tunnel_id;
int proto_version;
- int fd;
+ int fd = -1;
int ret = 0;
struct l2tp_tunnel_cfg cfg = { 0, };
struct l2tp_tunnel *tunnel;
struct net *net = genl_info_net(info);
+ struct nlattr **attrs = info->attrs;
- if (!info->attrs[L2TP_ATTR_CONN_ID]) {
+ if (!attrs[L2TP_ATTR_CONN_ID]) {
ret = -EINVAL;
goto out;
}
- tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
+ tunnel_id = nla_get_u32(attrs[L2TP_ATTR_CONN_ID]);
- if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
+ if (!attrs[L2TP_ATTR_PEER_CONN_ID]) {
ret = -EINVAL;
goto out;
}
- peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
+ peer_tunnel_id = nla_get_u32(attrs[L2TP_ATTR_PEER_CONN_ID]);
- if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
+ if (!attrs[L2TP_ATTR_PROTO_VERSION]) {
ret = -EINVAL;
goto out;
}
- proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
+ proto_version = nla_get_u8(attrs[L2TP_ATTR_PROTO_VERSION]);
- if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
+ if (!attrs[L2TP_ATTR_ENCAP_TYPE]) {
ret = -EINVAL;
goto out;
}
- cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
-
- fd = -1;
- if (info->attrs[L2TP_ATTR_FD]) {
- fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
+ cfg.encap = nla_get_u16(attrs[L2TP_ATTR_ENCAP_TYPE]);
+
+ /* Managed tunnels take the tunnel socket from userspace.
+ * Unmanaged tunnels must call out the source and destination addresses
+ * for the kernel to create the tunnel socket itself.
+ */
+ if (attrs[L2TP_ATTR_FD]) {
+ fd = nla_get_u32(attrs[L2TP_ATTR_FD]);
} else {
-#if IS_ENABLED(CONFIG_IPV6)
- if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
- info->attrs[L2TP_ATTR_IP6_DADDR]) {
- cfg.local_ip6 = nla_data(
- info->attrs[L2TP_ATTR_IP6_SADDR]);
- cfg.peer_ip6 = nla_data(
- info->attrs[L2TP_ATTR_IP6_DADDR]);
- } else
-#endif
- if (info->attrs[L2TP_ATTR_IP_SADDR] &&
- info->attrs[L2TP_ATTR_IP_DADDR]) {
- cfg.local_ip.s_addr = nla_get_in_addr(
- info->attrs[L2TP_ATTR_IP_SADDR]);
- cfg.peer_ip.s_addr = nla_get_in_addr(
- info->attrs[L2TP_ATTR_IP_DADDR]);
- } else {
- ret = -EINVAL;
+ ret = l2tp_nl_cmd_tunnel_create_get_addr(attrs, &cfg);
+ if (ret < 0)
goto out;
- }
- if (info->attrs[L2TP_ATTR_UDP_SPORT])
- cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
- if (info->attrs[L2TP_ATTR_UDP_DPORT])
- cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
- cfg.use_udp_checksums = nla_get_flag(
- info->attrs[L2TP_ATTR_UDP_CSUM]);
-
-#if IS_ENABLED(CONFIG_IPV6)
- cfg.udp6_zero_tx_checksums = nla_get_flag(
- info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
- cfg.udp6_zero_rx_checksums = nla_get_flag(
- info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
-#endif
}
- if (info->attrs[L2TP_ATTR_DEBUG])
- cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
+ if (attrs[L2TP_ATTR_DEBUG])
+ cfg.debug = nla_get_u32(attrs[L2TP_ATTR_DEBUG]);
ret = -EINVAL;
switch (cfg.encap) {
@@ -320,16 +319,79 @@ out:
return ret;
}
+#if IS_ENABLED(CONFIG_IPV6)
+static int l2tp_nl_tunnel_send_addr6(struct sk_buff *skb, struct sock *sk,
+ enum l2tp_encap_type encap)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ switch (encap) {
+ case L2TP_ENCAPTYPE_UDP:
+ if (udp_get_no_check6_tx(sk) &&
+ nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
+ return -1;
+ if (udp_get_no_check6_rx(sk) &&
+ nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
+ return -1;
+ if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
+ nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
+ return -1;
+ fallthrough;
+ case L2TP_ENCAPTYPE_IP:
+ if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR, &np->saddr) ||
+ nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR, &sk->sk_v6_daddr))
+ return -1;
+ break;
+ }
+ return 0;
+}
+#endif
+
+static int l2tp_nl_tunnel_send_addr4(struct sk_buff *skb, struct sock *sk,
+ enum l2tp_encap_type encap)
+{
+ struct inet_sock *inet = inet_sk(sk);
+
+ switch (encap) {
+ case L2TP_ENCAPTYPE_UDP:
+ if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx) ||
+ nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
+ nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
+ return -1;
+ fallthrough;
+ case L2TP_ENCAPTYPE_IP:
+ 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))
+ return -1;
+ break;
+ }
+
+ return 0;
+}
+
+/* Append attributes for the tunnel address, handling the different attribute types
+ * used for different tunnel encapsulation and AF_INET v.s. AF_INET6.
+ */
+static int l2tp_nl_tunnel_send_addr(struct sk_buff *skb, struct l2tp_tunnel *tunnel)
+{
+ struct sock *sk = tunnel->sock;
+
+ if (!sk)
+ return 0;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == AF_INET6)
+ return l2tp_nl_tunnel_send_addr6(skb, sk, tunnel->encap);
+#endif
+ return l2tp_nl_tunnel_send_addr4(skb, sk, tunnel->encap);
+}
+
static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
struct l2tp_tunnel *tunnel, u8 cmd)
{
void *hdr;
struct nlattr *nest;
- struct sock *sk = NULL;
- struct inet_sock *inet;
-#if IS_ENABLED(CONFIG_IPV6)
- struct ipv6_pinfo *np = NULL;
-#endif
hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
if (!hdr)
@@ -343,7 +405,7 @@ static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int fla
goto nla_put_failure;
nest = nla_nest_start_noflag(skb, L2TP_ATTR_STATS);
- if (nest == NULL)
+ if (!nest)
goto nla_put_failure;
if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
@@ -373,58 +435,9 @@ static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int fla
goto nla_put_failure;
nla_nest_end(skb, nest);
- sk = tunnel->sock;
- if (!sk)
- goto out;
-
-#if IS_ENABLED(CONFIG_IPV6)
- if (sk->sk_family == AF_INET6)
- np = inet6_sk(sk);
-#endif
-
- inet = inet_sk(sk);
-
- switch (tunnel->encap) {
- case L2TP_ENCAPTYPE_UDP:
- switch (sk->sk_family) {
- case AF_INET:
- if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
- goto nla_put_failure;
- break;
-#if IS_ENABLED(CONFIG_IPV6)
- case AF_INET6:
- if (udp_get_no_check6_tx(sk) &&
- nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
- goto nla_put_failure;
- if (udp_get_no_check6_rx(sk) &&
- nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
- goto nla_put_failure;
- break;
-#endif
- }
- if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
- nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
- goto nla_put_failure;
- /* fall through */
- case L2TP_ENCAPTYPE_IP:
-#if IS_ENABLED(CONFIG_IPV6)
- if (np) {
- if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
- &np->saddr) ||
- 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;
- }
+ if (l2tp_nl_tunnel_send_addr(skb, tunnel))
+ goto nla_put_failure;
-out:
genlmsg_end(skb, hdr);
return 0;
@@ -485,7 +498,7 @@ static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback
for (;;) {
tunnel = l2tp_tunnel_get_nth(net, ti);
- if (tunnel == NULL)
+ if (!tunnel)
goto out;
if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
@@ -570,6 +583,7 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf
if (info->attrs[L2TP_ATTR_COOKIE]) {
u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
+
if (len > 8) {
ret = -EINVAL;
goto out_tunnel;
@@ -579,6 +593,7 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf
}
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;
@@ -606,14 +621,13 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf
cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
#ifdef CONFIG_MODULES
- if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
+ if (!l2tp_nl_cmd_ops[cfg.pw_type]) {
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)) {
+ if (!l2tp_nl_cmd_ops[cfg.pw_type] || !l2tp_nl_cmd_ops[cfg.pw_type]->session_create) {
ret = -EPROTONOSUPPORT;
goto out_tunnel;
}
@@ -645,7 +659,7 @@ static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *inf
u16 pw_type;
session = l2tp_nl_session_get(info);
- if (session == NULL) {
+ if (!session) {
ret = -ENODEV;
goto out;
}
@@ -656,7 +670,7 @@ static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *inf
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);
+ l2tp_nl_cmd_ops[pw_type]->session_delete(session);
l2tp_session_dec_refcount(session);
@@ -670,7 +684,7 @@ static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *inf
struct l2tp_session *session;
session = l2tp_nl_session_get(info);
- if (session == NULL) {
+ if (!session) {
ret = -ENODEV;
goto out;
}
@@ -715,8 +729,7 @@ static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int fl
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_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))
goto nla_put_failure;
@@ -724,11 +737,9 @@ static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int fl
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])) ||
+ nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len, session->cookie)) ||
(session->peer_cookie_len &&
- nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
- &session->peer_cookie[0])) ||
+ nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, session->peer_cookie)) ||
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) ||
@@ -740,7 +751,7 @@ static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int fl
goto nla_put_failure;
nest = nla_nest_start_noflag(skb, L2TP_ATTR_STATS);
- if (nest == NULL)
+ if (!nest)
goto nla_put_failure;
if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
@@ -785,7 +796,7 @@ static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
int ret;
session = l2tp_nl_session_get(info);
- if (session == NULL) {
+ if (!session) {
ret = -ENODEV;
goto err;
}
@@ -824,14 +835,14 @@ static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback
int si = cb->args[1];
for (;;) {
- if (tunnel == NULL) {
+ if (!tunnel) {
tunnel = l2tp_tunnel_get_nth(net, ti);
- if (tunnel == NULL)
+ if (!tunnel)
goto out;
}
session = l2tp_session_get_nth(tunnel, si);
- if (session == NULL) {
+ if (!session) {
ti++;
l2tp_tunnel_dec_refcount(tunnel);
tunnel = NULL;
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index c54cb59593ef..13c3153b40d6 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -117,8 +117,7 @@ struct pppol2tp_session {
int owner; /* pid that opened the socket */
struct mutex sk_lock; /* Protects .sk */
- struct sock __rcu *sk; /* Pointer to the session
- * PPPoX socket */
+ struct sock __rcu *sk; /* Pointer to the session PPPoX socket */
struct sock *__sk; /* Copy of .sk, for cleanup */
struct rcu_head rcu; /* For asynchronous release */
};
@@ -155,17 +154,20 @@ static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
{
struct l2tp_session *session;
- if (sk == NULL)
+ if (!sk)
return NULL;
sock_hold(sk);
session = (struct l2tp_session *)(sk->sk_user_data);
- if (session == NULL) {
+ if (!session) {
+ sock_put(sk);
+ goto out;
+ }
+ if (WARN_ON(session->magic != L2TP_SESSION_MAGIC)) {
+ session = NULL;
sock_put(sk);
goto out;
}
-
- BUG_ON(session->magic != L2TP_SESSION_MAGIC);
out:
return session;
@@ -218,7 +220,7 @@ static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int
*/
rcu_read_lock();
sk = rcu_dereference(ps->sk);
- if (sk == NULL)
+ if (!sk)
goto no_sock;
/* If the first two bytes are 0xFF03, consider that it is the PPP's
@@ -286,7 +288,7 @@ static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
/* Get session and tunnel contexts */
error = -EBADF;
session = pppol2tp_sock_to_session(sk);
- if (session == NULL)
+ if (!session)
goto error;
tunnel = session->tunnel;
@@ -351,7 +353,7 @@ error:
*/
static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
{
- struct sock *sk = (struct sock *) chan->private;
+ struct sock *sk = (struct sock *)chan->private;
struct l2tp_session *session;
struct l2tp_tunnel *tunnel;
int uhlen, headroom;
@@ -361,7 +363,7 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
/* Get session and tunnel contexts from the socket */
session = pppol2tp_sock_to_session(sk);
- if (session == NULL)
+ if (!session)
goto abort;
tunnel = session->tunnel;
@@ -420,7 +422,8 @@ static void pppol2tp_session_destruct(struct sock *sk)
if (session) {
sk->sk_user_data = NULL;
- BUG_ON(session->magic != L2TP_SESSION_MAGIC);
+ if (WARN_ON(session->magic != L2TP_SESSION_MAGIC))
+ return;
l2tp_session_dec_refcount(session);
}
}
@@ -704,7 +707,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
* tunnel id.
*/
if (!info.session_id && !info.peer_session_id) {
- if (tunnel == NULL) {
+ if (!tunnel) {
struct l2tp_tunnel_cfg tcfg = {
.encap = L2TP_ENCAPTYPE_UDP,
.debug = 0,
@@ -739,11 +742,11 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
} else {
/* Error if we can't find the tunnel */
error = -ENOENT;
- if (tunnel == NULL)
+ if (!tunnel)
goto end;
/* Error if socket is not prepped */
- if (tunnel->sock == NULL)
+ if (!tunnel->sock)
goto end;
}
@@ -803,8 +806,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
* the internal context for use by ioctl() and sockopt()
* handlers.
*/
- if ((session->session_id == 0) &&
- (session->peer_session_id == 0)) {
+ if (session->session_id == 0 && session->peer_session_id == 0) {
error = 0;
goto out_no_ppp;
}
@@ -912,22 +914,23 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
struct pppol2tp_session *pls;
error = -ENOTCONN;
- if (sk == NULL)
+ if (!sk)
goto end;
if (!(sk->sk_state & PPPOX_CONNECTED))
goto end;
error = -EBADF;
session = pppol2tp_sock_to_session(sk);
- if (session == NULL)
+ if (!session)
goto end;
pls = l2tp_session_priv(session);
tunnel = session->tunnel;
inet = inet_sk(tunnel->sock);
- if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
+ if (tunnel->version == 2 && tunnel->sock->sk_family == AF_INET) {
struct sockaddr_pppol2tp sp;
+
len = sizeof(sp);
memset(&sp, 0, len);
sp.sa_family = AF_PPPOX;
@@ -943,8 +946,7 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
memcpy(uaddr, &sp, len);
#if IS_ENABLED(CONFIG_IPV6)
- } else if ((tunnel->version == 2) &&
- (tunnel->sock->sk_family == AF_INET6)) {
+ } else if (tunnel->version == 2 && tunnel->sock->sk_family == AF_INET6) {
struct sockaddr_pppol2tpin6 sp;
len = sizeof(sp);
@@ -962,8 +964,7 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
sizeof(tunnel->sock->sk_v6_daddr));
memcpy(uaddr, &sp, len);
- } else if ((tunnel->version == 3) &&
- (tunnel->sock->sk_family == AF_INET6)) {
+ } else if (tunnel->version == 3 && tunnel->sock->sk_family == AF_INET6) {
struct sockaddr_pppol2tpv3in6 sp;
len = sizeof(sp);
@@ -984,6 +985,7 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
#endif
} else if (tunnel->version == 3) {
struct sockaddr_pppol2tpv3 sp;
+
len = sizeof(sp);
memset(&sp, 0, len);
sp.sa_family = AF_PPPOX;
@@ -1178,7 +1180,7 @@ static int pppol2tp_session_setsockopt(struct sock *sk,
switch (optname) {
case PPPOL2TP_SO_RECVSEQ:
- if ((val != 0) && (val != 1)) {
+ if (val != 0 && val != 1) {
err = -EINVAL;
break;
}
@@ -1189,7 +1191,7 @@ static int pppol2tp_session_setsockopt(struct sock *sk,
break;
case PPPOL2TP_SO_SENDSEQ:
- if ((val != 0) && (val != 1)) {
+ if (val != 0 && val != 1) {
err = -EINVAL;
break;
}
@@ -1207,7 +1209,7 @@ static int pppol2tp_session_setsockopt(struct sock *sk,
break;
case PPPOL2TP_SO_LNSMODE:
- if ((val != 0) && (val != 1)) {
+ if (val != 0 && val != 1) {
err = -EINVAL;
break;
}
@@ -1244,7 +1246,7 @@ static int pppol2tp_session_setsockopt(struct sock *sk,
* session or the special tunnel type.
*/
static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
- char __user *optval, unsigned int optlen)
+ sockptr_t optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
struct l2tp_session *session;
@@ -1258,23 +1260,22 @@ static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
if (optlen < sizeof(int))
return -EINVAL;
- if (get_user(val, (int __user *)optval))
+ if (copy_from_sockptr(&val, optval, sizeof(int)))
return -EFAULT;
err = -ENOTCONN;
- if (sk->sk_user_data == NULL)
+ if (!sk->sk_user_data)
goto end;
/* Get session context from the socket */
err = -EBADF;
session = pppol2tp_sock_to_session(sk);
- if (session == NULL)
+ if (!session)
goto end;
/* Special case: if session_id == 0x0000, treat as operation on tunnel
*/
- if ((session->session_id == 0) &&
- (session->peer_session_id == 0)) {
+ if (session->session_id == 0 && session->peer_session_id == 0) {
tunnel = session->tunnel;
err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
} else {
@@ -1343,7 +1344,7 @@ static int pppol2tp_session_getsockopt(struct sock *sk,
break;
case PPPOL2TP_SO_REORDERTO:
- *val = (int) jiffies_to_msecs(session->reorder_timeout);
+ *val = (int)jiffies_to_msecs(session->reorder_timeout);
l2tp_info(session, L2TP_MSG_CONTROL,
"%s: get reorder_timeout=%d\n", session->name, *val);
break;
@@ -1381,18 +1382,17 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
return -EINVAL;
err = -ENOTCONN;
- if (sk->sk_user_data == NULL)
+ if (!sk->sk_user_data)
goto end;
/* Get the session context */
err = -EBADF;
session = pppol2tp_sock_to_session(sk);
- if (session == NULL)
+ if (!session)
goto end;
/* Special case: if session_id == 0x0000, treat as operation on tunnel */
- if ((session->session_id == 0) &&
- (session->peer_session_id == 0)) {
+ if (session->session_id == 0 && session->peer_session_id == 0) {
tunnel = session->tunnel;
err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
if (err)
@@ -1407,7 +1407,7 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
if (put_user(len, optlen))
goto end_put_sess;
- if (copy_to_user((void __user *) optval, &val, len))
+ if (copy_to_user((void __user *)optval, &val, len))
goto end_put_sess;
err = 0;
@@ -1463,7 +1463,7 @@ static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx);
pd->session_idx++;
- if (pd->session == NULL) {
+ if (!pd->session) {
pd->session_idx = 0;
pppol2tp_next_tunnel(net, pd);
}
@@ -1478,17 +1478,21 @@ static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
if (!pos)
goto out;
- BUG_ON(m->private == NULL);
+ if (WARN_ON(!m->private)) {
+ pd = NULL;
+ goto out;
+ }
+
pd = m->private;
net = seq_file_net(m);
- if (pd->tunnel == NULL)
+ if (!pd->tunnel)
pppol2tp_next_tunnel(net, pd);
else
pppol2tp_next_session(net, pd);
/* NULL tunnel and session indicates end of list */
- if ((pd->tunnel == NULL) && (pd->session == NULL))
+ if (!pd->tunnel && !pd->session)
pd = NULL;
out:
@@ -1551,6 +1555,7 @@ static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
if (tunnel->sock) {
struct inet_sock *inet = inet_sk(tunnel->sock);
+
ip = ntohl(inet->inet_saddr);
port = ntohs(inet->inet_sport);
}
@@ -1564,8 +1569,7 @@ static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
user_data_ok = 'N';
}
- seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
- "%04X/%04X %d %c\n",
+ seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> %04X/%04X %d %c\n",
session->name, ip, port,
tunnel->tunnel_id,
session->session_id,
@@ -1604,8 +1608,7 @@ static int pppol2tp_seq_show(struct seq_file *m, void *v)
seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
- seq_puts(m, " SESSION name, addr/port src-tid/sid "
- "dest-tid/sid state user-data-ok\n");
+ seq_puts(m, " SESSION name, addr/port src-tid/sid dest-tid/sid state user-data-ok\n");
seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
goto out;
@@ -1638,7 +1641,7 @@ static __net_init int pppol2tp_init_net(struct net *net)
int err = 0;
pde = proc_create_net("pppol2tp", 0444, net->proc_net,
- &pppol2tp_seq_ops, sizeof(struct pppol2tp_seq_data));
+ &pppol2tp_seq_ops, sizeof(struct pppol2tp_seq_data));
if (!pde) {
err = -ENOMEM;
goto out;
generated by cgit v1.2.3 (git 2.39.0) at 2024-07-23 16:39:31 +0300