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Date: Mon, 22 Nov 2010 18:36:21 +0000
From: Alban Crequy <alban.crequy@...labora.co.uk>
To: Alban Crequy <alban.crequy@...labora.co.uk>
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <eric.dumazet@...il.com>,
Stephen Hemminger <shemminger@...tta.com>,
Cyrill Gorcunov <gorcunov@...nvz.org>,
Alexey Dobriyan <adobriyan@...il.com>,
Lennart Poettering <lennart@...ttering.net>,
Kay Sievers <kay.sievers@...y.org>,
Ian Molton <ian.molton@...labora.co.uk>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
Alban Crequy <alban.crequy@...labora.co.uk>
Subject: [PATCH 8/9] AF_UNIX: add options on multicast connected socket
autojoin and send-to-peer
Signed-off-by: Alban Crequy <alban.crequy@...labora.co.uk>
---
include/net/af_unix.h | 27 +++++++++++++++++++++------
net/unix/af_unix.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 64 insertions(+), 7 deletions(-)
diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index bf114d5..c82b5f8 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -40,18 +40,31 @@ struct unix_skb_parms {
spin_lock_nested(&unix_sk(s)->lock, \
SINGLE_DEPTH_NESTING)
-#define UNIX_MREQ_LOOPBACK 0x01
+/* UNIX socket options */
+#define UNIX_CREATE_GROUP 1
+#define UNIX_JOIN_GROUP 2
+#define UNIX_LEAVE_GROUP 3
+
+/* Flags on unix_mreq */
+
+/* On UNIX_JOIN_GROUP: the socket will receive its own messages
+ * On UNIX_CREATE_GROUP: the accepted sockets will receive their own messages
+ */
+#define UNIX_MREQ_LOOPBACK 0x01
+
+/* On UNIX_CREATE_GROUP: the accepted socket will be member of the multicast
+ * group */
+#define UNIX_MREQ_AUTOJOIN 0x02
+
+/* ON UNIX_JOIN_GROUP: the messages will also be received by the peer */
+#define UNIX_MREQ_SEND_TO_PEER 0x04
+
struct unix_mreq
{
struct sockaddr_un address;
unsigned int flags;
};
-/* UNIX socket options */
-#define UNIX_CREATE_GROUP 1
-#define UNIX_JOIN_GROUP 2
-#define UNIX_LEAVE_GROUP 3
-
#ifdef __KERNEL__
/* The AF_UNIX socket */
struct unix_sock {
@@ -69,6 +82,8 @@ struct unix_sock {
unsigned int gc_candidate : 1;
unsigned int gc_maybe_cycle : 1;
unsigned int is_mcast_addr : 1;
+ unsigned int mcast_auto_join : 1;
+ unsigned int mcast_send_to_peer : 1;
/* These multicast fields are protected by the global spinlock
* unix_multicast_lock */
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 52e2aa2..d3d6270 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -878,6 +878,17 @@ static int unix_find_multicast_members(struct sock_set *set,
set->items[set->cnt].to_deliver = 1;
set->cnt++;
}
+
+ if (unix_peer(sender) && unix_sk(sender)->mcast_send_to_peer) {
+ if (set->cnt + 1 > recipient_cnt)
+ return -ENOMEM;
+ sock_hold(unix_peer(sender));
+ set->items[set->cnt].s = unix_peer(sender);
+ set->items[set->cnt].skb = NULL;
+ set->items[set->cnt].to_deliver = 1;
+ set->cnt++;
+ }
+
return 0;
}
@@ -1226,6 +1237,7 @@ static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
int st;
int err;
long timeo;
+ struct unix_mcast *node = NULL;
err = unix_mkname(sunaddr, addr_len, &hash);
if (err < 0)
@@ -1245,6 +1257,12 @@ static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
err = -ENOMEM;
+ node = kmalloc(sizeof(struct unix_mcast), GFP_KERNEL);
+ if (!node) {
+ err = -ENOMEM;
+ goto out;
+ }
+
/* create new sock for complete connection */
newsk = unix_create1(sock_net(sk), NULL);
if (newsk == NULL)
@@ -1261,6 +1279,8 @@ restart:
if (!other)
goto out;
+ otheru = unix_sk(other);
+
/* Latch state of peer */
unix_state_lock(other);
@@ -1332,6 +1352,21 @@ restart:
goto out_unlock;
}
+ /* Multicast sockets */
+ spin_lock(&unix_multicast_lock);
+ if (otheru->is_mcast_addr && otheru->mcast_auto_join) {
+ node->member = unix_sk(newsk);
+ node->addr = otheru;
+ node->flags = 0;
+
+ hlist_add_head(&node->member_node, &otheru->mcast_members);
+ hlist_add_head(&node->subscription_node,
+ &unix_sk(newsk)->mcast_subscriptions);
+ otheru->mcast_members_cnt++;
+ u->mcast_subscriptions_cnt++;
+ }
+ spin_unlock(&unix_multicast_lock);
+
/* The way is open! Fastly set all the necessary fields... */
sock_hold(sk);
@@ -1341,7 +1376,6 @@ restart:
init_peercred(newsk);
newu = unix_sk(newsk);
newsk->sk_wq = &newu->peer_wq;
- otheru = unix_sk(other);
/* copy address information from listening to new sock*/
if (otheru->addr) {
@@ -1380,6 +1414,8 @@ out_unlock:
out:
kfree_skb(skb);
+ if (node)
+ kfree(node);
if (newsk)
unix_release_sock(newsk, 0);
if (other)
@@ -1868,6 +1904,8 @@ static int unix_mc_create(struct socket *sock, struct unix_mreq *mreq)
unix_state_lock(sock->sk);
unix_sk(sock->sk)->is_mcast_addr = 1;
+ if (mreq->flags & UNIX_MREQ_AUTOJOIN)
+ unix_sk(sock->sk)->mcast_auto_join = 1;
unix_state_unlock(sock->sk);
return 0;
@@ -1918,6 +1956,10 @@ static int unix_mc_join(struct socket *sock, struct unix_mreq *mreq)
node->addr = otheru;
node->flags = mreq->flags;
+ unix_state_lock(sock->sk);
+ unix_sk(sock->sk)->mcast_send_to_peer = !!(mreq->flags & UNIX_MREQ_SEND_TO_PEER);
+ unix_state_unlock(sock->sk);
+
spin_lock(&unix_multicast_lock);
hlist_add_head(&node->member_node, &otheru->mcast_members);
hlist_add_head(&node->subscription_node, &u->mcast_subscriptions);
--
1.7.1
--
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