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path: root/net/l2tp/l2tp_ppp.c
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Diffstat (limited to 'net/l2tp/l2tp_ppp.c')
-rw-r--r--net/l2tp/l2tp_ppp.c198
1 files changed, 103 insertions, 95 deletions
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index 652c250b9a3b..f0edb7209079 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -177,7 +177,7 @@ static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
if (!pskb_may_pull(skb, 2))
return 1;
- if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03))
+ if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI))
skb_pull(skb, 2);
return 0;
@@ -231,14 +231,14 @@ static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int
if (sk->sk_state & PPPOX_BOUND) {
struct pppox_sock *po;
- l2tp_dbg(session, PPPOL2TP_MSG_DATA,
+ l2tp_dbg(session, L2TP_MSG_DATA,
"%s: recv %d byte data frame, passing to ppp\n",
session->name, data_len);
po = pppox_sk(sk);
ppp_input(&po->chan, skb);
} else {
- l2tp_dbg(session, PPPOL2TP_MSG_DATA,
+ l2tp_dbg(session, L2TP_MSG_DATA,
"%s: recv %d byte data frame, passing to L2TP socket\n",
session->name, data_len);
@@ -251,7 +251,7 @@ static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int
return;
no_sock:
- l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: no socket\n", session->name);
+ l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name);
kfree_skb(skb);
}
@@ -282,7 +282,6 @@ static void pppol2tp_session_sock_put(struct l2tp_session *session)
static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
size_t total_len)
{
- static const unsigned char ppph[2] = { 0xff, 0x03 };
struct sock *sk = sock->sk;
struct sk_buff *skb;
int error;
@@ -312,7 +311,7 @@ static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
error = -ENOMEM;
skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
uhlen + session->hdr_len +
- sizeof(ppph) + total_len,
+ 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
0, GFP_KERNEL);
if (!skb)
goto error_put_sess_tun;
@@ -325,8 +324,8 @@ static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
skb_reserve(skb, uhlen);
/* Add PPP header */
- skb->data[0] = ppph[0];
- skb->data[1] = ppph[1];
+ skb->data[0] = PPP_ALLSTATIONS;
+ skb->data[1] = PPP_UI;
skb_put(skb, 2);
/* Copy user data into skb */
@@ -369,7 +368,6 @@ error:
*/
static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
{
- static const u8 ppph[2] = { 0xff, 0x03 };
struct sock *sk = (struct sock *) chan->private;
struct sock *sk_tun;
struct l2tp_session *session;
@@ -398,14 +396,14 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
sizeof(struct iphdr) + /* IP header */
uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
session->hdr_len + /* L2TP header */
- sizeof(ppph); /* PPP header */
+ 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
if (skb_cow_head(skb, headroom))
goto abort_put_sess_tun;
/* Setup PPP header */
- __skb_push(skb, sizeof(ppph));
- skb->data[0] = ppph[0];
- skb->data[1] = ppph[1];
+ __skb_push(skb, 2);
+ skb->data[0] = PPP_ALLSTATIONS;
+ skb->data[1] = PPP_UI;
local_bh_disable();
l2tp_xmit_skb(session, skb, session->hdr_len);
@@ -440,7 +438,7 @@ static void pppol2tp_session_close(struct l2tp_session *session)
BUG_ON(session->magic != L2TP_SESSION_MAGIC);
if (sock) {
- inet_shutdown(sock, 2);
+ inet_shutdown(sock, SEND_SHUTDOWN);
/* Don't let the session go away before our socket does */
l2tp_session_inc_refcount(session);
}
@@ -452,6 +450,10 @@ static void pppol2tp_session_close(struct l2tp_session *session)
static void pppol2tp_session_destruct(struct sock *sk)
{
struct l2tp_session *session = sk->sk_user_data;
+
+ skb_queue_purge(&sk->sk_receive_queue);
+ skb_queue_purge(&sk->sk_write_queue);
+
if (session) {
sk->sk_user_data = NULL;
BUG_ON(session->magic != L2TP_SESSION_MAGIC);
@@ -490,9 +492,6 @@ static int pppol2tp_release(struct socket *sock)
l2tp_session_queue_purge(session);
sock_put(sk);
}
- skb_queue_purge(&sk->sk_receive_queue);
- skb_queue_purge(&sk->sk_write_queue);
-
release_sock(sk);
/* This will delete the session context via
@@ -554,7 +553,7 @@ out:
return error;
}
-#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
+#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
static void pppol2tp_show(struct seq_file *m, void *arg)
{
struct l2tp_session *session = arg;
@@ -584,6 +583,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
int error = 0;
u32 tunnel_id, peer_tunnel_id;
u32 session_id, peer_session_id;
+ bool drop_refcnt = false;
int ver = 2;
int fd;
@@ -685,36 +685,36 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
if (tunnel->peer_tunnel_id == 0)
tunnel->peer_tunnel_id = peer_tunnel_id;
- /* Create session if it doesn't already exist. We handle the
- * case where a session was previously created by the netlink
- * interface by checking that the session doesn't already have
- * a socket and its tunnel socket are what we expect. If any
- * of those checks fail, return EEXIST to the caller.
- */
- session = l2tp_session_find(sock_net(sk), tunnel, session_id);
- if (session == NULL) {
- /* Default MTU must allow space for UDP/L2TP/PPP
- * headers.
+ session = l2tp_session_get(sock_net(sk), tunnel, session_id, false);
+ if (session) {
+ drop_refcnt = true;
+ ps = l2tp_session_priv(session);
+
+ /* Using a pre-existing session is fine as long as it hasn't
+ * been connected yet.
*/
- cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
+ if (ps->sock) {
+ error = -EEXIST;
+ goto end;
+ }
- /* Allocate and initialize a new session context. */
- session = l2tp_session_create(sizeof(struct pppol2tp_session),
- tunnel, session_id,
- peer_session_id, &cfg);
- if (session == NULL) {
- error = -ENOMEM;
+ /* consistency checks */
+ if (ps->tunnel_sock != tunnel->sock) {
+ error = -EEXIST;
goto end;
}
} else {
- ps = l2tp_session_priv(session);
- error = -EEXIST;
- if (ps->sock != NULL)
- goto end;
+ /* Default MTU must allow space for UDP/L2TP/PPP headers */
+ cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
+ cfg.mru = cfg.mtu;
- /* consistency checks */
- if (ps->tunnel_sock != tunnel->sock)
+ session = l2tp_session_create(sizeof(struct pppol2tp_session),
+ tunnel, session_id,
+ peer_session_id, &cfg);
+ if (IS_ERR(session)) {
+ error = PTR_ERR(session);
goto end;
+ }
}
/* Associate session with its PPPoL2TP socket */
@@ -725,7 +725,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
session->recv_skb = pppol2tp_recv;
session->session_close = pppol2tp_session_close;
-#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
+#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
session->show = pppol2tp_show;
#endif
@@ -775,10 +775,12 @@ out_no_ppp:
/* This is how we get the session context from the socket. */
sk->sk_user_data = session;
sk->sk_state = PPPOX_CONNECTED;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
+ l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
session->name);
end:
+ if (drop_refcnt)
+ l2tp_session_dec_refcount(session);
release_sock(sk);
return error;
@@ -806,12 +808,6 @@ static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_i
if (tunnel->sock == NULL)
goto out;
- /* Check that this session doesn't already exist */
- error = -EEXIST;
- session = l2tp_session_find(net, tunnel, session_id);
- if (session != NULL)
- goto out;
-
/* Default MTU values. */
if (cfg->mtu == 0)
cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
@@ -819,17 +815,18 @@ static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_i
cfg->mru = cfg->mtu;
/* Allocate and initialize a new session context. */
- error = -ENOMEM;
session = l2tp_session_create(sizeof(struct pppol2tp_session),
tunnel, session_id,
peer_session_id, cfg);
- if (session == NULL)
+ if (IS_ERR(session)) {
+ error = PTR_ERR(session);
goto out;
+ }
ps = l2tp_session_priv(session);
ps->tunnel_sock = tunnel->sock;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
+ l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
session->name);
error = 0;
@@ -856,7 +853,7 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
error = -ENOTCONN;
if (sk == NULL)
goto end;
- if (sk->sk_state != PPPOX_CONNECTED)
+ if (!(sk->sk_state & PPPOX_CONNECTED))
goto end;
error = -EBADF;
@@ -866,10 +863,8 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
pls = l2tp_session_priv(session);
tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
- if (tunnel == NULL) {
- error = -EBADF;
+ if (tunnel == NULL)
goto end_put_sess;
- }
inet = inet_sk(tunnel->sock);
if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
@@ -947,12 +942,11 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
}
*usockaddr_len = len;
+ error = 0;
sock_put(pls->tunnel_sock);
end_put_sess:
sock_put(sk);
- error = 0;
-
end:
return error;
}
@@ -994,7 +988,7 @@ static int pppol2tp_session_ioctl(struct l2tp_session *session,
struct l2tp_tunnel *tunnel = session->tunnel;
struct pppol2tp_ioc_stats stats;
- l2tp_dbg(session, PPPOL2TP_MSG_CONTROL,
+ l2tp_dbg(session, L2TP_MSG_CONTROL,
"%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
session->name, cmd, arg);
@@ -1014,7 +1008,7 @@ static int pppol2tp_session_ioctl(struct l2tp_session *session,
if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
break;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mtu=%d\n",
+ l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n",
session->name, session->mtu);
err = 0;
break;
@@ -1030,7 +1024,7 @@ static int pppol2tp_session_ioctl(struct l2tp_session *session,
session->mtu = ifr.ifr_mtu;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mtu=%d\n",
+ l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n",
session->name, session->mtu);
err = 0;
break;
@@ -1044,7 +1038,7 @@ static int pppol2tp_session_ioctl(struct l2tp_session *session,
if (put_user(session->mru, (int __user *) arg))
break;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mru=%d\n",
+ l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n",
session->name, session->mru);
err = 0;
break;
@@ -1059,7 +1053,7 @@ static int pppol2tp_session_ioctl(struct l2tp_session *session,
break;
session->mru = val;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mru=%d\n",
+ l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n",
session->name, session->mru);
err = 0;
break;
@@ -1069,7 +1063,7 @@ static int pppol2tp_session_ioctl(struct l2tp_session *session,
if (put_user(ps->flags, (int __user *) arg))
break;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get flags=%d\n",
+ l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n",
session->name, ps->flags);
err = 0;
break;
@@ -1079,7 +1073,7 @@ static int pppol2tp_session_ioctl(struct l2tp_session *session,
if (get_user(val, (int __user *) arg))
break;
ps->flags = val;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set flags=%d\n",
+ l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n",
session->name, ps->flags);
err = 0;
break;
@@ -1096,7 +1090,7 @@ static int pppol2tp_session_ioctl(struct l2tp_session *session,
if (copy_to_user((void __user *) arg, &stats,
sizeof(stats)))
break;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
+ l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
session->name);
err = 0;
break;
@@ -1124,7 +1118,7 @@ static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
struct sock *sk;
struct pppol2tp_ioc_stats stats;
- l2tp_dbg(tunnel, PPPOL2TP_MSG_CONTROL,
+ l2tp_dbg(tunnel, L2TP_MSG_CONTROL,
"%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
tunnel->name, cmd, arg);
@@ -1145,11 +1139,18 @@ static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
if (stats.session_id != 0) {
/* resend to session ioctl handler */
struct l2tp_session *session =
- l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
- if (session != NULL)
- err = pppol2tp_session_ioctl(session, cmd, arg);
- else
+ l2tp_session_get(sock_net(sk), tunnel,
+ stats.session_id, true);
+
+ if (session) {
+ err = pppol2tp_session_ioctl(session, cmd,
+ arg);
+ if (session->deref)
+ session->deref(session);
+ l2tp_session_dec_refcount(session);
+ } else {
err = -EBADR;
+ }
break;
}
#ifdef CONFIG_XFRM
@@ -1160,7 +1161,7 @@ static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
err = -EFAULT;
break;
}
- l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
+ l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
tunnel->name);
err = 0;
break;
@@ -1250,7 +1251,7 @@ static int pppol2tp_tunnel_setsockopt(struct sock *sk,
switch (optname) {
case PPPOL2TP_SO_DEBUG:
tunnel->debug = val;
- l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
+ l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
tunnel->name, tunnel->debug);
break;
@@ -1277,8 +1278,8 @@ static int pppol2tp_session_setsockopt(struct sock *sk,
err = -EINVAL;
break;
}
- session->recv_seq = val ? -1 : 0;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL,
+ session->recv_seq = !!val;
+ l2tp_info(session, L2TP_MSG_CONTROL,
"%s: set recv_seq=%d\n",
session->name, session->recv_seq);
break;
@@ -1288,7 +1289,7 @@ static int pppol2tp_session_setsockopt(struct sock *sk,
err = -EINVAL;
break;
}
- session->send_seq = val ? -1 : 0;
+ session->send_seq = !!val;
{
struct sock *ssk = ps->sock;
struct pppox_sock *po = pppox_sk(ssk);
@@ -1296,7 +1297,7 @@ static int pppol2tp_session_setsockopt(struct sock *sk,
PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
}
l2tp_session_set_header_len(session, session->tunnel->version);
- l2tp_info(session, PPPOL2TP_MSG_CONTROL,
+ l2tp_info(session, L2TP_MSG_CONTROL,
"%s: set send_seq=%d\n",
session->name, session->send_seq);
break;
@@ -1306,21 +1307,21 @@ static int pppol2tp_session_setsockopt(struct sock *sk,
err = -EINVAL;
break;
}
- session->lns_mode = val ? -1 : 0;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL,
+ session->lns_mode = !!val;
+ l2tp_info(session, L2TP_MSG_CONTROL,
"%s: set lns_mode=%d\n",
session->name, session->lns_mode);
break;
case PPPOL2TP_SO_DEBUG:
session->debug = val;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
+ l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
session->name, session->debug);
break;
case PPPOL2TP_SO_REORDERTO:
session->reorder_timeout = msecs_to_jiffies(val);
- l2tp_info(session, PPPOL2TP_MSG_CONTROL,
+ l2tp_info(session, L2TP_MSG_CONTROL,
"%s: set reorder_timeout=%d\n",
session->name, session->reorder_timeout);
break;
@@ -1382,8 +1383,6 @@ static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
} else
err = pppol2tp_session_setsockopt(sk, session, optname, val);
- err = 0;
-
end_put_sess:
sock_put(sk);
end:
@@ -1401,7 +1400,7 @@ static int pppol2tp_tunnel_getsockopt(struct sock *sk,
switch (optname) {
case PPPOL2TP_SO_DEBUG:
*val = tunnel->debug;
- l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get debug=%x\n",
+ l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n",
tunnel->name, tunnel->debug);
break;
@@ -1424,31 +1423,31 @@ static int pppol2tp_session_getsockopt(struct sock *sk,
switch (optname) {
case PPPOL2TP_SO_RECVSEQ:
*val = session->recv_seq;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL,
+ l2tp_info(session, L2TP_MSG_CONTROL,
"%s: get recv_seq=%d\n", session->name, *val);
break;
case PPPOL2TP_SO_SENDSEQ:
*val = session->send_seq;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL,
+ l2tp_info(session, L2TP_MSG_CONTROL,
"%s: get send_seq=%d\n", session->name, *val);
break;
case PPPOL2TP_SO_LNSMODE:
*val = session->lns_mode;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL,
+ l2tp_info(session, L2TP_MSG_CONTROL,
"%s: get lns_mode=%d\n", session->name, *val);
break;
case PPPOL2TP_SO_DEBUG:
*val = session->debug;
- l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get debug=%d\n",
+ l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n",
session->name, *val);
break;
case PPPOL2TP_SO_REORDERTO:
*val = (int) jiffies_to_msecs(session->reorder_timeout);
- l2tp_info(session, PPPOL2TP_MSG_CONTROL,
+ l2tp_info(session, L2TP_MSG_CONTROL,
"%s: get reorder_timeout=%d\n", session->name, *val);
break;
@@ -1506,8 +1505,13 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
sock_put(ps->tunnel_sock);
- } else
+ if (err)
+ goto end_put_sess;
+ } else {
err = pppol2tp_session_getsockopt(sk, session, optname, &val);
+ if (err)
+ goto end_put_sess;
+ }
err = -EFAULT;
if (put_user(len, optlen))
@@ -1559,7 +1563,7 @@ static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
{
- pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
+ pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);
pd->session_idx++;
if (pd->session == NULL) {
@@ -1612,7 +1616,7 @@ static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
seq_printf(m, "\nTUNNEL '%s', %c %d\n",
tunnel->name,
(tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
- atomic_read(&tunnel->ref_count) - 1);
+ refcount_read(&tunnel->ref_count) - 1);
seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
tunnel->debug,
atomic_long_read(&tunnel->stats.tx_packets),
@@ -1686,10 +1690,14 @@ static int pppol2tp_seq_show(struct seq_file *m, void *v)
/* Show the tunnel or session context.
*/
- if (pd->session == NULL)
+ if (!pd->session) {
pppol2tp_seq_tunnel_show(m, pd->tunnel);
- else
+ } else {
pppol2tp_seq_session_show(m, pd->session);
+ if (pd->session->deref)
+ pd->session->deref(pd->session);
+ l2tp_session_dec_refcount(pd->session);
+ }
out:
return 0;
@@ -1848,4 +1856,4 @@ MODULE_DESCRIPTION("PPP over L2TP over UDP");
MODULE_LICENSE("GPL");
MODULE_VERSION(PPPOL2TP_DRV_VERSION);
MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
-MODULE_ALIAS_L2TP_PWTYPE(11);
+MODULE_ALIAS_L2TP_PWTYPE(7);
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-27 21:07:42 +0000