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authorStephen Hemminger <shemminger@osdl.org>2006-08-03 16:38:49 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-08-04 22:59:50 -0700
commit30a584d944fbd599d4a8f470f75bf7af1a15b466 (patch)
tree7e90f97222f776db8a01c51256c7071e35523543 /net/llc
parentb9e2cc0f0e47ad351349156018ef8a365e9c6d25 (diff)
[LLX]: SOCK_DGRAM interface fixes
The datagram interface of LLC is broken in a couple of ways. These were discovered when trying to use it to build an out-of-kernel version of STP. First it didn't pass the source address of the received packet in recvfrom(). It needs to copy the source address of received LLC packets into the socket control block. At the same time fix a security issue because there was uninitialized data leakage. Every recvfrom call was just copying out old data. Second, LLC should not merge multiple packets in one receive call on datagram sockets. LLC should preserve packet boundaries on SOCK_DGRAM. This fix goes against the old historical comments about UNIX98 semantics but without this fix SOCK_DGRAM is broken and useless. So either ANK's interpretation was incorect or UNIX98 standard was wrong. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Acked-by: Arnaldo Carvalho de Melo <acme@mandriva.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/llc')
-rw-r--r--net/llc/af_llc.c20
-rw-r--r--net/llc/llc_sap.c4
2 files changed, 10 insertions, 14 deletions
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index d6cfe84d521..2652ead96c6 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -784,24 +784,20 @@ static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
copied += used;
len -= used;
- if (used + offset < skb->len)
- continue;
-
if (!(flags & MSG_PEEK)) {
sk_eat_skb(sk, skb, 0);
*seq = 0;
}
+
+ /* For non stream protcols we get one packet per recvmsg call */
+ if (sk->sk_type != SOCK_STREAM)
+ goto copy_uaddr;
+
+ /* Partial read */
+ if (used + offset < skb->len)
+ continue;
} while (len > 0);
- /*
- * According to UNIX98, msg_name/msg_namelen are ignored
- * on connected socket. -ANK
- * But... af_llc still doesn't have separate sets of methods for
- * SOCK_DGRAM and SOCK_STREAM :-( So we have to do this test, will
- * eventually fix this tho :-) -acme
- */
- if (sk->sk_type == SOCK_DGRAM)
- goto copy_uaddr;
out:
release_sock(sk);
return copied;
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
index 20c4eb5c1ac..42eb0c3a978 100644
--- a/net/llc/llc_sap.c
+++ b/net/llc/llc_sap.c
@@ -51,10 +51,10 @@ void llc_save_primitive(struct sock *sk, struct sk_buff* skb, u8 prim)
{
struct sockaddr_llc *addr;
- if (skb->sk->sk_type == SOCK_STREAM) /* See UNIX98 */
- return;
/* save primitive for use by the user. */
addr = llc_ui_skb_cb(skb);
+
+ memset(addr, 0, sizeof(*addr));
addr->sllc_family = sk->sk_family;
addr->sllc_arphrd = skb->dev->type;
addr->sllc_test = prim == LLC_TEST_PRIM;