diff options
| author | Eric Leblond <eric@inl.fr> | 2007-09-18 13:07:15 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-09-20 12:13:52 -0700 |
| commit | 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 (patch) | |
| tree | 932854319ca02c2c0190ea35b3e38bb929014d45 | |
| parent | 6d0b842d3bf0cc027dcff57a89fb8a6b1fd610e1 (diff) | |
[NETFILTER]: nfnetlink_log: fix sending of multipart messages
The following patch fixes the handling of netlink packets containing
multiple messages.
As exposed during netfilter workshop, nfnetlink_log was overwritten the
message type of the last message (setting it to MSG_DONE) in a multipart
packet. The consequence was libnfnetlink to ignore the last message in the
packet.
The following patch adds a supplementary message (with type MSG_DONE) af
the end of the netlink skb.
Signed-off-by: Eric Leblond <eric@inl.fr>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/netfilter/nfnetlink_log.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c index e185a5b55913..2351533a8507 100644 --- a/net/netfilter/nfnetlink_log.c +++ b/net/netfilter/nfnetlink_log.c @@ -58,7 +58,6 @@ struct nfulnl_instance { unsigned int qlen; /* number of nlmsgs in skb */ struct sk_buff *skb; /* pre-allocatd skb */ - struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */ struct timer_list timer; int peer_pid; /* PID of the peer process */ @@ -345,10 +344,12 @@ static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size, static int __nfulnl_send(struct nfulnl_instance *inst) { - int status; + int status = -1; if (inst->qlen > 1) - inst->lastnlh->nlmsg_type = NLMSG_DONE; + NLMSG_PUT(inst->skb, 0, 0, + NLMSG_DONE, + sizeof(struct nfgenmsg)); status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT); if (status < 0) { @@ -358,8 +359,8 @@ __nfulnl_send(struct nfulnl_instance *inst) inst->qlen = 0; inst->skb = NULL; - inst->lastnlh = NULL; +nlmsg_failure: return status; } @@ -538,7 +539,6 @@ __build_packet_message(struct nfulnl_instance *inst, } nlh->nlmsg_len = inst->skb->tail - old_tail; - inst->lastnlh = nlh; return 0; nlmsg_failure: @@ -644,7 +644,8 @@ nfulnl_log_packet(unsigned int pf, } if (inst->qlen >= qthreshold || - (inst->skb && size > skb_tailroom(inst->skb))) { + (inst->skb && size > + skb_tailroom(inst->skb) - sizeof(struct nfgenmsg))) { /* either the queue len is too high or we don't have * enough room in the skb left. flush to userspace. */ UDEBUG("flushing old skb\n"); |