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Message-ID: <20141227101239.3ea24d70@urahara>
Date: Sat, 27 Dec 2014 10:12:39 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: David Miller <davem@...emloft.net>
Cc: Tom Herbert <therbert@...gle.com>,
Guillaume Nault <g.nault@...halink.fr>,
linux-api@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH net-next] l2tp : multicast notification to the registered
listeners
From: Bill Hong <bhong@...cade.com>
Previously l2tp module did not provide any means for the user space to
get notified when tunnels/sessions are added/modified/deleted.
This change contains the following
- create a multicast group for the listeners to register.
- notify the registered listeners when the tunnels/sessions are
created/modified/deleted.
Signed-off-by: Bill Hong <bhong@...cade.com>
Reviewed-by: Stephen Hemminger <stephen@...workplumber.org>
Reviewed-by: Sven-Thorsten Dietrich <sven@...cade.com>
--- a/include/uapi/linux/l2tp.h 2014-12-27 09:58:06.650962294 -0800
+++ b/include/uapi/linux/l2tp.h 2014-12-27 09:58:06.646962270 -0800
@@ -178,5 +178,6 @@ enum l2tp_seqmode {
*/
#define L2TP_GENL_NAME "l2tp"
#define L2TP_GENL_VERSION 0x1
+#define L2TP_GENL_MCGROUP "l2tp"
#endif /* _UAPI_LINUX_L2TP_H_ */
--- a/net/l2tp/l2tp_netlink.c 2014-12-27 09:58:06.650962294 -0800
+++ b/net/l2tp/l2tp_netlink.c 2014-12-27 10:08:42.058892710 -0800
@@ -40,6 +40,18 @@ static struct genl_family l2tp_nl_family
.netnsok = true,
};
+static const struct genl_multicast_group l2tp_multicast_group[] = {
+ {
+ .name = L2TP_GENL_MCGROUP,
+ },
+};
+
+static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
+ int flags, struct l2tp_tunnel *tunnel, u8 cmd);
+static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
+ int flags, struct l2tp_session *session,
+ u8 cmd);
+
/* Accessed under genl lock */
static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
@@ -97,6 +109,52 @@ out:
return ret;
}
+static int l2tp_tunnel_notify(struct genl_family *family,
+ struct genl_info *info,
+ struct l2tp_tunnel *tunnel,
+ u8 cmd)
+{
+ struct sk_buff *msg;
+ int ret;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
+ NLM_F_ACK, tunnel, cmd);
+
+ if (ret >= 0)
+ return genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
+
+ nlmsg_free(msg);
+
+ return ret;
+}
+
+static int l2tp_session_notify(struct genl_family *family,
+ struct genl_info *info,
+ struct l2tp_session *session,
+ u8 cmd)
+{
+ struct sk_buff *msg;
+ int ret;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
+ NLM_F_ACK, session, cmd);
+
+ if (ret >= 0)
+ return genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
+
+ nlmsg_free(msg);
+
+ return ret;
+}
+
static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
{
u32 tunnel_id;
@@ -188,6 +246,9 @@ static int l2tp_nl_cmd_tunnel_create(str
break;
}
+ if (ret >= 0)
+ ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
+ tunnel, L2TP_CMD_TUNNEL_CREATE);
out:
return ret;
}
@@ -211,6 +272,9 @@ static int l2tp_nl_cmd_tunnel_delete(str
goto out;
}
+ l2tp_tunnel_notify(&l2tp_nl_family, info,
+ tunnel, L2TP_CMD_TUNNEL_DELETE);
+
(void) l2tp_tunnel_delete(tunnel);
out:
@@ -239,12 +303,15 @@ static int l2tp_nl_cmd_tunnel_modify(str
if (info->attrs[L2TP_ATTR_DEBUG])
tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
+ ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
+ tunnel, L2TP_CMD_TUNNEL_MODIFY);
+
out:
return ret;
}
static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
- struct l2tp_tunnel *tunnel)
+ struct l2tp_tunnel *tunnel, u8 cmd)
{
void *hdr;
struct nlattr *nest;
@@ -254,8 +321,7 @@ static int l2tp_nl_tunnel_send(struct sk
struct ipv6_pinfo *np = NULL;
#endif
- hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags,
- L2TP_CMD_TUNNEL_GET);
+ hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
if (!hdr)
return -EMSGSIZE;
@@ -359,7 +425,7 @@ static int l2tp_nl_cmd_tunnel_get(struct
}
ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
- NLM_F_ACK, tunnel);
+ NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
if (ret < 0)
goto err_out;
@@ -385,7 +451,7 @@ static int l2tp_nl_cmd_tunnel_dump(struc
if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
- tunnel) <= 0)
+ tunnel, L2TP_CMD_TUNNEL_GET) <= 0)
goto out;
ti++;
@@ -539,6 +605,13 @@ static int l2tp_nl_cmd_session_create(st
ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
session_id, peer_session_id, &cfg);
+ if (ret >= 0) {
+ session = l2tp_session_find(net, tunnel, session_id);
+ if (session)
+ ret = l2tp_session_notify(&l2tp_nl_family, info, session,
+ L2TP_CMD_SESSION_CREATE);
+ }
+
out:
return ret;
}
@@ -555,6 +628,9 @@ static int l2tp_nl_cmd_session_delete(st
goto out;
}
+ l2tp_session_notify(&l2tp_nl_family, info,
+ session, L2TP_CMD_SESSION_DELETE);
+
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)
@@ -601,12 +677,15 @@ static int l2tp_nl_cmd_session_modify(st
if (info->attrs[L2TP_ATTR_MRU])
session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
+ ret = l2tp_session_notify(&l2tp_nl_family, info,
+ session, L2TP_CMD_SESSION_MODIFY);
+
out:
return ret;
}
static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
- struct l2tp_session *session)
+ struct l2tp_session *session, u8 cmd)
{
void *hdr;
struct nlattr *nest;
@@ -615,7 +694,7 @@ static int l2tp_nl_session_send(struct s
sk = tunnel->sock;
- hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
+ hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
if (!hdr)
return -EMSGSIZE;
@@ -699,7 +778,7 @@ static int l2tp_nl_cmd_session_get(struc
}
ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
- 0, session);
+ 0, session, L2TP_CMD_SESSION_GET);
if (ret < 0)
goto err_out;
@@ -737,7 +816,7 @@ static int l2tp_nl_cmd_session_dump(stru
if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
- session) <= 0)
+ session, L2TP_CMD_SESSION_GET) <= 0)
break;
si++;
@@ -896,7 +975,9 @@ EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops
static int l2tp_nl_init(void)
{
pr_info("L2TP netlink interface\n");
- return genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops);
+ return genl_register_family_with_ops_groups(&l2tp_nl_family,
+ l2tp_nl_ops,
+ l2tp_multicast_group);
}
static void l2tp_nl_cleanup(void)
--
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