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linux/net/ipv6
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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 NOTRACK/RAW dependency on NETFILTER_ADVANCED. 2011-11-23 16:07:00 -05:00
addrconf_core.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
addrconf.c ipv6: Fix for adding multicast route for loopback device automatically. 2011-12-12 18:48:18 -05:00
addrlabel.c rtnetlink: Compute and store minimum ifinfo dump size 2011-06-09 20:38:07 -07:00
af_inet6.c gro: refetch inet6_protos[] after pulling ext headers 2011-10-10 14:26:16 -04:00
ah6.c ah: Don't return NET_XMIT_DROP on input. 2011-11-12 18:13:32 -05:00
anycast.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
datagram.c ipv6: Remove superfluous NULL pointer check in ipv6_local_rxpmtu 2011-10-18 23:51:30 -04:00
esp6.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-05-05 14:59:02 -07:00
exthdrs_core.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
exthdrs.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
fib6_rules.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
icmp.c net: more accurate skb truesize 2011-10-13 16:05:07 -04:00
inet6_connection_sock.c ipv6: tcp: fix panic in SYN processing 2011-11-23 15:49:31 -05:00
inet6_hashtables.c net: Compute protocol sequence numbers and fragment IDs using MD5. 2011-08-06 18:33:19 -07:00
ip6_fib.c cleanup: remove unnecessary include. 2011-10-19 19:26:16 -04:00
ip6_flowlabel.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
ip6_input.c ipv6: drop packets when source address is multicast 2011-11-08 12:37:06 -05:00
ip6_output.c net: introduce DST_NOPEER dst flag 2011-12-22 22:34:56 -05:00
ip6_tunnel.c ip6_tunnel: copy parms.name after register_netdevice 2011-11-14 00:24:06 -05:00
ip6mr.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
ipcomp6.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
ipv6_sockglue.c ipv6: Set mcast_hops to IPV6_DEFAULT_MCASTHOPS when -1 was given. 2011-11-28 18:09:13 -05:00
Kconfig ipv6: ip6mr: support multiple tables 2010-05-11 14:40:55 +02:00
Makefile [IPV6] MROUTE: Support multicast forwarding. 2008-04-05 22:33:38 +09:00
mcast.c mcast: Fix source address selection for multicast listener report 2011-08-24 17:46:15 -07:00
mip6.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
ndisc.c ipv6: fix a bug in ndisc_send_redirect 2011-11-23 03:51:54 -05:00
netfilter.c Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
proc.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
protocol.c net: add __rcu annotations to protocol 2010-10-27 11:37:31 -07:00
raw.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
reassembly.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
route.c ipv6: Check dest prefix length on original route not copied one in rt6_alloc_cow(). 2011-12-13 17:35:06 -05:00
sit.c ipip, sit: copy parms.name after register_netdevice 2011-12-12 18:50:51 -05:00
syncookies.c tcp: add const qualifiers where possible 2011-10-21 05:22:42 -04:00
sysctl_net_ipv6.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
tcp_ipv6.c ipv6: tcp: fix tcp_v6_conn_request() 2011-11-23 17:29:23 -05:00
tunnel6.c tunnels: add _rcu annotations 2010-10-25 13:09:45 -07:00
udp_impl.h net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
udp.c Revert "udp: remove redundant variable" 2011-12-01 14:12:55 -05:00
udplite.c Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
xfrm6_input.c netfilter: ipv6: use NFPROTO values for NF_HOOK invocation 2010-03-25 16:00:49 +01:00
xfrm6_mode_beet.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
xfrm6_mode_ro.c [IPSEC]: Make x->lastused an unsigned long 2008-01-28 14:53:52 -08:00
xfrm6_mode_transport.c [IPSEC]: Use IPv6 calling convention as the convention for x->mode->output 2007-10-10 16:55:54 -07:00
xfrm6_mode_tunnel.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
xfrm6_output.c xfrm6: Don't call icmpv6_send on local error 2011-10-18 23:53:10 -04:00
xfrm6_policy.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
xfrm6_state.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
xfrm6_tunnel.c ipv6: Fix return of xfrm6_tunnel_rcv() 2011-05-24 01:11:51 -04:00