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Eric Dumazet e688a60480 net: introduce DST_NOPEER dst flag 
Chris Boot reported crashes occurring in ipv6_select_ident().

[  461.457562] RIP: 0010:[<ffffffff812dde61>]  [<ffffffff812dde61>]
ipv6_select_ident+0x31/0xa7

[  461.578229] Call Trace:
[  461.580742] <IRQ>
[  461.582870]  [<ffffffff812efa7f>] ? udp6_ufo_fragment+0x124/0x1a2
[  461.589054]  [<ffffffff812dbfe0>] ? ipv6_gso_segment+0xc0/0x155
[  461.595140]  [<ffffffff812700c6>] ? skb_gso_segment+0x208/0x28b
[  461.601198]  [<ffffffffa03f236b>] ? ipv6_confirm+0x146/0x15e
[nf_conntrack_ipv6]
[  461.608786]  [<ffffffff81291c4d>] ? nf_iterate+0x41/0x77
[  461.614227]  [<ffffffff81271d64>] ? dev_hard_start_xmit+0x357/0x543
[  461.620659]  [<ffffffff81291cf6>] ? nf_hook_slow+0x73/0x111
[  461.626440]  [<ffffffffa0379745>] ? br_parse_ip_options+0x19a/0x19a
[bridge]
[  461.633581]  [<ffffffff812722ff>] ? dev_queue_xmit+0x3af/0x459
[  461.639577]  [<ffffffffa03747d2>] ? br_dev_queue_push_xmit+0x72/0x76
[bridge]
[  461.646887]  [<ffffffffa03791e3>] ? br_nf_post_routing+0x17d/0x18f
[bridge]
[  461.653997]  [<ffffffff81291c4d>] ? nf_iterate+0x41/0x77
[  461.659473]  [<ffffffffa0374760>] ? br_flood+0xfa/0xfa [bridge]
[  461.665485]  [<ffffffff81291cf6>] ? nf_hook_slow+0x73/0x111
[  461.671234]  [<ffffffffa0374760>] ? br_flood+0xfa/0xfa [bridge]
[  461.677299]  [<ffffffffa0379215>] ?
nf_bridge_update_protocol+0x20/0x20 [bridge]
[  461.684891]  [<ffffffffa03bb0e5>] ? nf_ct_zone+0xa/0x17 [nf_conntrack]
[  461.691520]  [<ffffffffa0374760>] ? br_flood+0xfa/0xfa [bridge]
[  461.697572]  [<ffffffffa0374812>] ? NF_HOOK.constprop.8+0x3c/0x56
[bridge]
[  461.704616]  [<ffffffffa0379031>] ?
nf_bridge_push_encap_header+0x1c/0x26 [bridge]
[  461.712329]  [<ffffffffa037929f>] ? br_nf_forward_finish+0x8a/0x95
[bridge]
[  461.719490]  [<ffffffffa037900a>] ?
nf_bridge_pull_encap_header+0x1c/0x27 [bridge]
[  461.727223]  [<ffffffffa0379974>] ? br_nf_forward_ip+0x1c0/0x1d4 [bridge]
[  461.734292]  [<ffffffff81291c4d>] ? nf_iterate+0x41/0x77
[  461.739758]  [<ffffffffa03748cc>] ? __br_deliver+0xa0/0xa0 [bridge]
[  461.746203]  [<ffffffff81291cf6>] ? nf_hook_slow+0x73/0x111
[  461.751950]  [<ffffffffa03748cc>] ? __br_deliver+0xa0/0xa0 [bridge]
[  461.758378]  [<ffffffffa037533a>] ? NF_HOOK.constprop.4+0x56/0x56
[bridge]

This is caused by bridge netfilter special dst_entry (fake_rtable), a
special shared entry, where attaching an inetpeer makes no sense.

Problem is present since commit 87c48fa3b4 (ipv6: make fragment
identifications less predictable)

Introduce DST_NOPEER dst flag and make sure ipv6_select_ident() and
__ip_select_ident() fallback to the 'no peer attached' handling.

Reported-by: Chris Boot <bootc@bootc.net>
Tested-by: Chris Boot <bootc@bootc.net>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2011-12-22 22:34:56 -05:00
..
netfilter netfilter: Remove unnecessary OOM logging messages 2011-11-01 09:19:49 +01:00
Kconfig net: bridge builtin vs. ipv6 modular 2011-03-10 13:45:57 -08:00
Makefile bridge: Add core IGMP snooping support 2010-02-28 00:48:45 -08:00
br.c bridge: allow creating bridge devices with netlink 2011-04-04 17:22:28 -07:00
br_device.c Merge branch 'master' of github.com:davem330/net 2011-10-07 13:38:43 -04:00
br_fdb.c bridge: allow updating existing fdb entries 2011-10-03 12:17:33 -04:00
br_forward.c net: bridge: check the length of skb after nf_bridge_maybe_copy_header() 2011-01-06 11:33:05 -08:00
br_if.c Merge branch 'master' of ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2011-10-24 18:18:09 -04:00
br_input.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
br_ioctl.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-04-11 13:44:25 -07:00
br_multicast.c bridge: correct IPv6 checksum after pull 2011-11-16 17:32:43 -05:00
br_netfilter.c net: introduce DST_NOPEER dst flag 2011-12-22 22:34:56 -05:00
br_netlink.c bridge: master device stuck in no-carrier state forever when in user-stp mode 2011-12-01 14:05:17 -05:00
br_notify.c Bridge: Always send NETDEV_CHANGEADDR up on br MAC change. 2011-08-09 21:44:44 -07:00
br_private.h Merge branch 'master' of ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2011-10-24 18:18:09 -04:00
br_private_stp.h bridge: minor cleanups 2011-07-22 17:01:13 -07:00
br_stp.c bridge: master device stuck in no-carrier state forever when in user-stp mode 2011-12-01 14:05:17 -05:00
br_stp_bpdu.c bridge: minor cleanups 2011-07-22 17:01:13 -07:00
br_stp_if.c net: fix implicit kmod.h usage in bridge/br_stp_if.c 2011-10-31 19:30:30 -04:00
br_stp_timer.c bridge: add notification over netlink when STP changes state 2011-07-22 17:01:12 -07:00
br_sysfs_br.c bridge: allow forwarding some link local frames 2011-10-06 15:27:56 -04:00
br_sysfs_if.c bridge: range check STP parameters 2011-04-04 17:22:29 -07:00