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* net: l2tp_eth: provide tx_dropped counterEric Dumazet2012-06-291-5/+10
| | | | | | | | | | | | Change l2tp_xmit_skb() to return NET_XMIT_DROP in case skb is dropped. Use kfree_skb() instead dev_kfree_skb() for drop_monitor pleasure. Support tx_dropped counter for l2tp_eth Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: l2tp_eth: use LLTX to avoid LOCKDEP splatsEric Dumazet2012-06-261-11/+32
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Denys Fedoryshchenko reported a LOCKDEP issue with l2tp code. [ 8683.927442] ====================================================== [ 8683.927555] [ INFO: possible circular locking dependency detected ] [ 8683.927672] 3.4.1-build-0061 #14 Not tainted [ 8683.927782] ------------------------------------------------------- [ 8683.927895] swapper/0/0 is trying to acquire lock: [ 8683.928007] (slock-AF_INET){+.-...}, at: [<e0fc73ec>] l2tp_xmit_skb+0x173/0x47e [l2tp_core] [ 8683.928121] [ 8683.928121] but task is already holding lock: [ 8683.928121] (_xmit_ETHER#2){+.-...}, at: [<c02f062d>] sch_direct_xmit+0x36/0x119 [ 8683.928121] [ 8683.928121] which lock already depends on the new lock. [ 8683.928121] [ 8683.928121] [ 8683.928121] the existing dependency chain (in reverse order) is: [ 8683.928121] [ 8683.928121] -> #1 (_xmit_ETHER#2){+.-...}: [ 8683.928121] [<c015a561>] lock_acquire+0x71/0x85 [ 8683.928121] [<c034da2d>] _raw_spin_lock+0x33/0x40 [ 8683.928121] [<c0304e0c>] ip_send_reply+0xf2/0x1ce [ 8683.928121] [<c0317dbc>] tcp_v4_send_reset+0x153/0x16f [ 8683.928121] [<c0317f4a>] tcp_v4_do_rcv+0x172/0x194 [ 8683.928121] [<c031929b>] tcp_v4_rcv+0x387/0x5a0 [ 8683.928121] [<c03001d0>] ip_local_deliver_finish+0x13a/0x1e9 [ 8683.928121] [<c0300645>] NF_HOOK.clone.11+0x46/0x4d [ 8683.928121] [<c030075b>] ip_local_deliver+0x41/0x45 [ 8683.928121] [<c03005dd>] ip_rcv_finish+0x31a/0x33c [ 8683.928121] [<c0300645>] NF_HOOK.clone.11+0x46/0x4d [ 8683.928121] [<c0300960>] ip_rcv+0x201/0x23d [ 8683.928121] [<c02de91b>] __netif_receive_skb+0x329/0x378 [ 8683.928121] [<c02deae8>] netif_receive_skb+0x4e/0x7d [ 8683.928121] [<e08d5ef3>] rtl8139_poll+0x243/0x33d [8139too] [ 8683.928121] [<c02df103>] net_rx_action+0x90/0x15d [ 8683.928121] [<c012b2b5>] __do_softirq+0x7b/0x118 [ 8683.928121] [ 8683.928121] -> #0 (slock-AF_INET){+.-...}: [ 8683.928121] [<c0159f1b>] __lock_acquire+0x9a3/0xc27 [ 8683.928121] [<c015a561>] lock_acquire+0x71/0x85 [ 8683.928121] [<c034da2d>] _raw_spin_lock+0x33/0x40 [ 8683.928121] [<e0fc73ec>] l2tp_xmit_skb+0x173/0x47e [l2tp_core] [ 8683.928121] [<e0fe31fb>] l2tp_eth_dev_xmit+0x1a/0x2f [l2tp_eth] [ 8683.928121] [<c02e01e7>] dev_hard_start_xmit+0x333/0x3f2 [ 8683.928121] [<c02f064c>] sch_direct_xmit+0x55/0x119 [ 8683.928121] [<c02e0528>] dev_queue_xmit+0x282/0x418 [ 8683.928121] [<c031f4fb>] NF_HOOK.clone.19+0x45/0x4c [ 8683.928121] [<c031f524>] arp_xmit+0x22/0x24 [ 8683.928121] [<c031f567>] arp_send+0x41/0x48 [ 8683.928121] [<c031fa7d>] arp_process+0x289/0x491 [ 8683.928121] [<c031f4fb>] NF_HOOK.clone.19+0x45/0x4c [ 8683.928121] [<c031f7a0>] arp_rcv+0xb1/0xc3 [ 8683.928121] [<c02de91b>] __netif_receive_skb+0x329/0x378 [ 8683.928121] [<c02de9d3>] process_backlog+0x69/0x130 [ 8683.928121] [<c02df103>] net_rx_action+0x90/0x15d [ 8683.928121] [<c012b2b5>] __do_softirq+0x7b/0x118 [ 8683.928121] [ 8683.928121] other info that might help us debug this: [ 8683.928121] [ 8683.928121] Possible unsafe locking scenario: [ 8683.928121] [ 8683.928121] CPU0 CPU1 [ 8683.928121] ---- ---- [ 8683.928121] lock(_xmit_ETHER#2); [ 8683.928121] lock(slock-AF_INET); [ 8683.928121] lock(_xmit_ETHER#2); [ 8683.928121] lock(slock-AF_INET); [ 8683.928121] [ 8683.928121] *** DEADLOCK *** [ 8683.928121] [ 8683.928121] 3 locks held by swapper/0/0: [ 8683.928121] #0: (rcu_read_lock){.+.+..}, at: [<c02dbc10>] rcu_lock_acquire+0x0/0x30 [ 8683.928121] #1: (rcu_read_lock_bh){.+....}, at: [<c02dbc10>] rcu_lock_acquire+0x0/0x30 [ 8683.928121] #2: (_xmit_ETHER#2){+.-...}, at: [<c02f062d>] sch_direct_xmit+0x36/0x119 [ 8683.928121] [ 8683.928121] stack backtrace: [ 8683.928121] Pid: 0, comm: swapper/0 Not tainted 3.4.1-build-0061 #14 [ 8683.928121] Call Trace: [ 8683.928121] [<c034bdd2>] ? printk+0x18/0x1a [ 8683.928121] [<c0158904>] print_circular_bug+0x1ac/0x1b6 [ 8683.928121] [<c0159f1b>] __lock_acquire+0x9a3/0xc27 [ 8683.928121] [<c015a561>] lock_acquire+0x71/0x85 [ 8683.928121] [<e0fc73ec>] ? l2tp_xmit_skb+0x173/0x47e [l2tp_core] [ 8683.928121] [<c034da2d>] _raw_spin_lock+0x33/0x40 [ 8683.928121] [<e0fc73ec>] ? l2tp_xmit_skb+0x173/0x47e [l2tp_core] [ 8683.928121] [<e0fc73ec>] l2tp_xmit_skb+0x173/0x47e [l2tp_core] [ 8683.928121] [<e0fe31fb>] l2tp_eth_dev_xmit+0x1a/0x2f [l2tp_eth] [ 8683.928121] [<c02e01e7>] dev_hard_start_xmit+0x333/0x3f2 [ 8683.928121] [<c02f064c>] sch_direct_xmit+0x55/0x119 [ 8683.928121] [<c02e0528>] dev_queue_xmit+0x282/0x418 [ 8683.928121] [<c02e02a6>] ? dev_hard_start_xmit+0x3f2/0x3f2 [ 8683.928121] [<c031f4fb>] NF_HOOK.clone.19+0x45/0x4c [ 8683.928121] [<c031f524>] arp_xmit+0x22/0x24 [ 8683.928121] [<c02e02a6>] ? dev_hard_start_xmit+0x3f2/0x3f2 [ 8683.928121] [<c031f567>] arp_send+0x41/0x48 [ 8683.928121] [<c031fa7d>] arp_process+0x289/0x491 [ 8683.928121] [<c031f7f4>] ? __neigh_lookup.clone.20+0x42/0x42 [ 8683.928121] [<c031f4fb>] NF_HOOK.clone.19+0x45/0x4c [ 8683.928121] [<c031f7a0>] arp_rcv+0xb1/0xc3 [ 8683.928121] [<c031f7f4>] ? __neigh_lookup.clone.20+0x42/0x42 [ 8683.928121] [<c02de91b>] __netif_receive_skb+0x329/0x378 [ 8683.928121] [<c02de9d3>] process_backlog+0x69/0x130 [ 8683.928121] [<c02df103>] net_rx_action+0x90/0x15d [ 8683.928121] [<c012b2b5>] __do_softirq+0x7b/0x118 [ 8683.928121] [<c012b23a>] ? local_bh_enable+0xd/0xd [ 8683.928121] <IRQ> [<c012b4d0>] ? irq_exit+0x41/0x91 [ 8683.928121] [<c0103c6f>] ? do_IRQ+0x79/0x8d [ 8683.928121] [<c0157ea1>] ? trace_hardirqs_off_caller+0x2e/0x86 [ 8683.928121] [<c034ef6e>] ? common_interrupt+0x2e/0x34 [ 8683.928121] [<c0108a33>] ? default_idle+0x23/0x38 [ 8683.928121] [<c01091a8>] ? cpu_idle+0x55/0x6f [ 8683.928121] [<c033df25>] ? rest_init+0xa1/0xa7 [ 8683.928121] [<c033de84>] ? __read_lock_failed+0x14/0x14 [ 8683.928121] [<c0498745>] ? start_kernel+0x303/0x30a [ 8683.928121] [<c0498209>] ? repair_env_string+0x51/0x51 [ 8683.928121] [<c04980a8>] ? i386_start_kernel+0xa8/0xaf It appears that like most virtual devices, l2tp should be converted to LLTX mode. This patch takes care of statistics using atomic_long in both RX and TX paths, and fix a bug in l2tp_eth_dev_recv(), which was caching skb->data before a pskb_may_pull() call. Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Denys Fedoryshchenko <denys@visp.net.lb> Cc: James Chapman <jchapman@katalix.com> Cc: Hong zhi guo <honkiko@gmail.com> Cc: Francois Romieu <romieu@fr.zoreil.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: l2tp_eth: fix l2tp_eth_dev_xmit raceEric Dumazet2012-06-251-3/+3
| | | | | | | | | Its illegal to dereference skb after giving it to l2tp_xmit_skb() as it might be already freed/reused. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: l2tp_eth: fix kernel panic on rmmod l2tp_ethEric Dumazet2012-06-071-0/+2
| | | | | | | | | | | We must prevent module unloading if some devices are still attached to l2tp_eth driver. Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Denys Fedoryshchenko <denys@visp.net.lb> Tested-by: Denys Fedoryshchenko <denys@visp.net.lb> Cc: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: l2tp: Standardize logging stylesJoe Perches2012-05-171-10/+5
| | | | | | | | | | | | | | | | | | Use more current logging styles. Add pr_fmt to prefix output appropriately. Convert printks to pr_<level>. Convert PRINTK macros to new l2tp_<level> macros. Neaten some <foo>_refcount debugging macros. Use print_hex_dump_bytes instead of hand-coded loops. Coalesce formats and align arguments. Some KERN_DEBUG output is not now emitted unless dynamic_debugging is enabled. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: replace random_ether_addr() with eth_hw_addr_random()Danny Kukawka2012-02-151-1/+1
| | | | | | | | | | | | Replace usage of random_ether_addr() with eth_hw_addr_random() to set addr_assign_type correctly to NET_ADDR_RANDOM. Change the trivial cases. v2: adapt to renamed eth_hw_addr_random() Signed-off-by: Danny Kukawka <danny.kukawka@bisect.de> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: Audit drivers to identify those needing IFF_TX_SKB_SHARING clearedNeil Horman2011-07-271-1/+1
| | | | | | | | | | | | | | | | | | | | | | | After the last patch, We are left in a state in which only drivers calling ether_setup have IFF_TX_SKB_SHARING set (we assume that drivers touching real hardware call ether_setup for their net_devices and don't hold any state in their skbs. There are a handful of drivers that violate this assumption of course, and need to be fixed up. This patch identifies those drivers, and marks them as not being able to support the safe transmission of skbs by clearning the IFF_TX_SKB_SHARING flag in priv_flags Signed-off-by: Neil Horman <nhorman@tuxdriver.com> CC: Karsten Keil <isdn@linux-pingi.de> CC: "David S. Miller" <davem@davemloft.net> CC: Jay Vosburgh <fubar@us.ibm.com> CC: Andy Gospodarek <andy@greyhouse.net> CC: Patrick McHardy <kaber@trash.net> CC: Krzysztof Halasa <khc@pm.waw.pl> CC: "John W. Linville" <linville@tuxdriver.com> CC: Greg Kroah-Hartman <gregkh@suse.de> CC: Marcel Holtmann <marcel@holtmann.org> CC: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* l2tp: fix possible oops on l2tp_eth module unloadJames Chapman2011-03-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | A struct used in the l2tp_eth driver for registering network namespace ops was incorrectly marked as __net_initdata, leading to oops when module unloaded. BUG: unable to handle kernel paging request at ffffffffa00ec098 IP: [<ffffffff8123dbd8>] ops_exit_list+0x7/0x4b PGD 142d067 PUD 1431063 PMD 195da8067 PTE 0 Oops: 0000 [#1] SMP last sysfs file: /sys/module/l2tp_eth/refcnt Call Trace: [<ffffffff8123dc94>] ? unregister_pernet_operations+0x32/0x93 [<ffffffff8123dd20>] ? unregister_pernet_device+0x2b/0x38 [<ffffffff81068b6e>] ? sys_delete_module+0x1b8/0x222 [<ffffffff810c7300>] ? do_munmap+0x254/0x318 [<ffffffff812c64e5>] ? page_fault+0x25/0x30 [<ffffffff812c6952>] ? system_call_fastpath+0x16/0x1b Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge branch 'master' of ↵David S. Miller2010-09-091-1/+1
|\ | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: net/mac80211/main.c
| * l2tp: test for ethernet header in l2tp_eth_dev_recv()Eric Dumazet2010-08-261-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | close https://bugzilla.kernel.org/show_bug.cgi?id=16529 Before calling dev_forward_skb(), we should make sure skb head contains at least an ethernet header, even if length included in upper layer said so. Use pskb_may_pull() to make sure this ethernet header is present in skb head. Reported-by: Thomas Heil <heil@terminal-consulting.de> Reported-by: Ian Campbell <Ian.Campbell@eu.citrix.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: another last_rx roundEric Dumazet2010-09-021-1/+0
|/ | | | | | | Kill last_rx use in l2tp and two net drivers Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* l2tp_eth: fix memory allocationJiri Pirko2010-04-231-28/+1
| | | | | | | | | Since .size is set properly in "struct pernet_operations l2tp_eth_net_ops", allocating space for "struct l2tp_eth_net" by hand is not correct, even causes memory leakage. Signed-off-by: Jiri Pirko <jpirko@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* l2tp: Fix L2TP_DEBUGFS ifdef tests.David S. Miller2010-04-031-2/+2
| | | | | | | We have to check CONFIG_L2TP_DEBUGFS_MODULE as well as CONFIG_L2TP_DEBUGFS. Signed-off-by: David S. Miller <davem@davemloft.net>
* l2tp: Add debugfs files for dumping l2tp debug infoJames Chapman2010-04-031-0/+14
| | | | | | | | | | | | | | | | | | | | The existing pppol2tp driver exports debug info to /proc/net/pppol2tp. Rather than adding info to that file for the new functionality added in this patch series, we add new files in debugfs, leaving the old /proc file for backwards compatibility (L2TPv2 only). Currently only one file is provided: l2tp/tunnels, which lists internal debug info for all l2tp tunnels and sessions. More files may be added later. The info is for debug and problem analysis only - userspace apps should use netlink to obtain status about l2tp tunnels and sessions. Although debugfs does not support net namespaces, the tunnels and sessions dumped in l2tp/tunnels are only those in the net namespace of the process reading the file. Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* l2tp: Add L2TP ethernet pseudowire supportJames Chapman2010-04-031-0/+347
This driver presents a regular net_device for each L2TP ethernet pseudowire instance. These interfaces are named l2tpethN by default, though userspace can specify an alternative name when the L2TP session is created, if preferred. When the pseudowire is established, regular Linux networking utilities may be used to configure the interface, i.e. give it IP address info or add it to a bridge. Any data passed over the interface is carried over an L2TP tunnel. Signed-off-by: James Chapman <jchapman@katalix.com> Reviewed-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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