linux/net, branch v2.6.28

net: Fix module refcount leak in kernel_accept()

2008-12-19T03:35:10Z

The kernel_accept() does not hold the module refcount of newsock->ops->owner, so we need __module_get(newsock->ops->owner) code after call kernel_accept() by hand. In sunrpc, the module refcount is missing to hold. So this cause kernel panic. Used following script to reproduct: while [ 1 ]; do mount -t nfs4 192.168.0.19:/ /mnt touch /mnt/file umount /mnt lsmod | grep ipv6 done This patch fixed the problem by add __module_get(newsock->ops->owner) to kernel_accept(). So we do not need to used __module_get(newsock->ops->owner) in every place when used kernel_accept(). Signed-off-by: Wei Yongjun Signed-off-by: David S. Miller

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

2008-12-16T00:30:22Z

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: Phonet: keep TX queue disabled when the device is off SCHED: netem: Correct documentation comment in code. netfilter: update rwlock initialization for nat_table netlabel: Compiler warning and NULL pointer dereference fix e1000e: fix double release of mutex IA64: HP_SIMETH needs to depend upon NET netpoll: fix race on poll_list resulting in garbage entry ipv6: silence log messages for locally generated multicast sungem: improve ethtool output with internal pcs and serdes tcp: tcp_vegas cong avoid fix sungem: Make PCS PHY support partially work again.

Phonet: keep TX queue disabled when the device is off

2008-12-15T08:53:57Z

Signed-off-by: Rémi Denis-Courmont Signed-off-by: David S. Miller

SCHED: netem: Correct documentation comment in code.

2008-12-15T08:39:17Z

The netem simulator is no longer limited by Linux timer resolution HZ. Not since Patrick McHardy changed the QoS system to use hrtimer. Signed-off-by: Jesper Dangaard Brouer Signed-off-by: David S. Miller

netfilter: update rwlock initialization for nat_table

2008-12-15T08:19:14Z

The commit e099a173573ce1ba171092aee7bb3c72ea686e59 (netfilter: netns nat: per-netns NAT table) renamed the nat_table from __nat_table to nat_table without updating the __RW_LOCK_UNLOCKED(__nat_table.lock). Signed-off-by: Steven Rostedt Signed-off-by: David S. Miller

netlabel: Compiler warning and NULL pointer dereference fix

2008-12-12T05:31:50Z

Fix the two compiler warnings show below. Thanks to Geert Uytterhoeven for finding and reporting the problem. net/netlabel/netlabel_unlabeled.c:567: warning: 'entry' may be used uninitialized in this function net/netlabel/netlabel_unlabeled.c:629: warning: 'entry' may be used uninitialized in this function Signed-off-by: Paul Moore Signed-off-by: David S. Miller

netpoll: fix race on poll_list resulting in garbage entry

2008-12-10T07:22:26Z

A few months back a race was discused between the netpoll napi service path, and the fast path through net_rx_action: http://kerneltrap.org/mailarchive/linux-netdev/2007/10/16/345470 A patch was submitted for that bug, but I think we missed a case. Consider the following scenario: INITIAL STATE CPU0 has one napi_struct A on its poll_list CPU1 is calling netpoll_send_skb and needs to call poll_napi on the same napi_struct A that CPU0 has on its list CPU0 CPU1 net_rx_action poll_napi !list_empty (returns true) locks poll_lock for A poll_one_napi napi->poll netif_rx_complete __napi_complete (removes A from poll_list) list_entry(list->next) In the above scenario, net_rx_action assumes that the per-cpu poll_list is exclusive to that cpu. netpoll of course violates that, and because the netpoll path can dequeue from the poll list, its possible for CPU0 to detect a non-empty list at the top of the while loop in net_rx_action, but have it become empty by the time it calls list_entry. Since the poll_list isn't surrounded by any other structure, the returned data from that list_entry call in this situation is garbage, and any number of crashes can result based on what exactly that garbage is. Given that its not fasible for performance reasons to place exclusive locks arround each cpus poll list to provide that mutal exclusion, I think the best solution is modify the netpoll path in such a way that we continue to guarantee that the poll_list for a cpu is in fact exclusive to that cpu. To do this I've implemented the patch below. It adds an additional bit to the state field in the napi_struct. When executing napi->poll from the netpoll_path, this bit will be set. When a driver calls netif_rx_complete, if that bit is set, it will not remove the napi_struct from the poll_list. That work will be saved for the next iteration of net_rx_action. I've tested this and it seems to work well. About the biggest drawback I can see to it is the fact that it might result in an extra loop through net_rx_action in the event that the device is actually contended for (i.e. the netpoll path actually preforms all the needed work no the device, and the call to net_rx_action winds up doing nothing, except removing the napi_struct from the poll_list. However I think this is probably a small price to pay, given that the alternative is a crash. Signed-off-by: Neil Horman Signed-off-by: David S. Miller

ipv6: silence log messages for locally generated multicast

2008-12-09T23:48:32Z

This patch fixes minor annoyance during transmission of unsolicited neighbor advertisements from userspace to multicast addresses (as far as I can see in RFC, this is allowed and the similar functionality for IPv4 has been in arping for a long time). Outgoing multicast packets get reinserted into local processing as if they are received from the network. The machine thus sees its own NA and fills the logs with error messages. This patch removes the message if NA has been generated locally. Signed-off-by: Jan Sembera Signed-off-by: David S. Miller

tcp: tcp_vegas cong avoid fix

2008-12-09T08:13:04Z

This patch addresses a book-keeping issue in tcp_vegas.c. At present tcp_vegas does separate book-keeping of cwnd based on packet sequence numbers. A mismatch can develop between this book-keeping and tp->snd_cwnd due, for example, to delayed acks acking multiple packets. When vegas transitions to reno operation (e.g. following loss), then this mismatch leads to incorrect behaviour (akin to a cwnd backoff). This seems mostly to affect operation at low cwnds where delayed acking can lead to a significant fraction of cwnd being covered by a single ack, leading to the book-keeping mismatch. This patch modifies the congestion avoidance update to avoid the need for separate book-keeping while leaving vegas congestion avoidance functionally unchanged. A secondary advantage of this modification is that the use of fixed-point (via V_PARAM_SHIFT) and 64 bit arithmetic is no longer necessary, simplifying the code. Some example test measurements with the patched code (confirming no functional change in the congestion avoidance algorithm) can be seen at: http://www.hamilton.ie/doug/vegaspatch/ Signed-off-by: Doug Leith Signed-off-by: David S. Miller

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

2008-12-09T03:52:43Z

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: tproxy: fixe a possible read from an invalid location in the socket match zd1211rw: use unaligned safe memcmp() in-place of compare_ether_addr() mac80211: use unaligned safe memcmp() in-place of compare_ether_addr() ipw2200: fix netif_*_queue() removal regression iwlwifi: clean key table in iwl_clear_stations_table function tcp: tcp_vegas ssthresh bug fix can: omit received RTR frames for single ID filter lists ATM: CVE-2008-5079: duplicate listen() on socket corrupts the vcc table netx-eth: initialize per device spinlock tcp: make urg+gso work for real this time enc28j60: Fix sporadic packet loss (corrected again) hysdn: fix writing outside the field on 64 bits b1isa: fix b1isa_exit() to really remove registered capi controllers can: Fix CAN_(EFF|RTR)_FLAG handling in can_filter Phonet: do not dump addresses from other namespaces netlabel: Fix a potential NULL pointer dereference bnx2: Add workaround to handle missed MSI. xfrm: Fix kernel panic when flush and dump SPD entries