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daba287b29
linux/net/ipv4
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Hannes Frederic Sowa daba287b29 ipv4: fix DO and PROBE pmtu mode regarding local fragmentation with UFO/CORK 
UFO as well as UDP_CORK do not respect IP_PMTUDISC_DO and
IP_PMTUDISC_PROBE well enough.

UFO enabled packet delivery just appends all frags to the cork and hands
it over to the network card. So we just deliver non-DF udp fragments
(DF-flag may get overwritten by hardware or virtual UFO enabled
interface).

UDP_CORK does enqueue the data until the cork is disengaged. At this
point it sets the correct IP_DF and local_df flags and hands it over to
ip_fragment which in this case will generate an icmp error which gets
appended to the error socket queue. This is not reflected in the syscall
error (of course, if UFO is enabled this also won't happen).

Improve this by checking the pmtudisc flags before appending data to the
socket and if we still can fit all data in one packet when IP_PMTUDISC_DO
or IP_PMTUDISC_PROBE is set, only then proceed.

We use (mtu-fragheaderlen) to check for the maximum length because we
ensure not to generate a fragment and non-fragmented data does not need
to have its length aligned on 64 bit boundaries. Also the passed in
ip_options are already aligned correctly.

Maybe, we can relax some other checks around ip_fragment. This needs
more research.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-10-29 00:15:22 -04:00
..
netfilter netfilter: nf_tables: add ARP filtering support 2013-10-14 18:01:03 +02:00
af_inet.c inet: restore gso for vxlan 2013-10-28 00:23:06 -04:00
ah4.c
arp.c net: neighbour: Remove CONFIG_ARPD 2013-09-03 21:41:43 -04:00
cipso_ipv4.c
datagram.c
devinet.c net: igmp: Allow user-space configuration of igmp unsolicited report interval 2013-08-09 11:27:46 -07:00
esp4.c net: esp{4,6}: fix potential MTU calculation overflows 2013-08-05 12:26:50 -07:00
fib_frontend.c fib_trie: remove duplicated rcu lock 2013-10-18 13:53:59 -04:00
fib_lookup.h net: ipv4/ipv6: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
fib_rules.c fib_rules: fix suppressor names and default values 2013-08-03 10:40:23 -07:00
fib_semantics.c fib: Use const struct nl_info * in rtmsg_fib 2013-10-18 14:42:15 -04:00
fib_trie.c fib_trie: only calc for the un-first node 2013-10-10 00:08:07 -04:00
gre_demux.c ipv4: generalize gre_handle_offloads 2013-10-19 19:36:18 -04:00
gre_offload.c ipip: add GSO/TSO support 2013-10-19 19:36:19 -04:00
icmp.c ipv4: processing ancillary IP_TOS or IP_TTL 2013-09-28 15:21:52 -07:00
igmp.c ipv4 igmp: use in_dev_put in timer handlers instead of __in_dev_put 2013-09-30 22:28:56 -07:00
inet_connection_sock.c inet: rename ir_loc_port to ir_num 2013-10-10 14:37:35 -04:00
inet_diag.c inet_diag: use sock_gen_put() 2013-10-17 15:02:02 -04:00
inet_fragment.c inet: remove old fragmentation hash initializing 2013-10-23 17:01:41 -04:00
inet_hashtables.c inet: convert inet_ehash_secret and ipv6_hash_secret to net_get_random_once 2013-10-19 19:45:35 -04:00
inet_lro.c
inet_timewait_sock.c tcp/dccp: remove twchain 2013-10-08 23:19:24 -04:00
inetpeer.c ip: generate unique IP identificator if local fragmentation is allowed 2013-09-19 14:11:15 -04:00
ip_forward.c
ip_fragment.c ipv4: initialize ip4_frags hash secret as late as possible 2013-10-23 17:01:40 -04:00
ip_gre.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-08-16 15:37:26 -07:00
ip_input.c net: add SNMP counters tracking incoming ECN bits 2013-08-08 22:24:59 -07:00
ip_options.c
ip_output.c ipv4: fix DO and PROBE pmtu mode regarding local fragmentation with UFO/CORK 2013-10-29 00:15:22 -04:00
ip_sockglue.c net: ipv4 only populate IP_PKTINFO when needed 2013-10-08 16:27:33 -04:00
ip_tunnel_core.c ipv4: generalize gre_handle_offloads 2013-10-19 19:36:18 -04:00
ip_tunnel.c ip_tunnel: Remove double unregister of the fallback device 2013-10-01 12:42:16 -04:00
ip_vti.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-10-23 16:49:34 -04:00
ipcomp.c
ipconfig.c
ipip.c ipip: add GSO/TSO support 2013-10-19 19:36:19 -04:00
ipmr.c ip: generate unique IP identificator if local fragmentation is allowed 2013-09-19 14:11:15 -04:00
Kconfig net: neighbour: Remove CONFIG_ARPD 2013-09-03 21:41:43 -04:00
Makefile
netfilter.c
ping.c net: fix build errors if ipv6 is disabled 2013-10-09 13:04:03 -04:00
proc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-08-16 15:37:26 -07:00
protocol.c
raw.c net: ipv4 only populate IP_PKTINFO when needed 2013-10-08 16:27:33 -04:00
route.c ipv4: shrink rt_cache_stat 2013-10-17 16:11:04 -04:00
syncookies.c inet: split syncookie keys for ipv4 and ipv6 and initialize with net_get_random_once 2013-10-19 19:45:35 -04:00
sysctl_net_ipv4.c ipv4: Allow unprivileged users to use per net sysctls 2013-10-21 18:43:03 -04:00
tcp_bic.c
tcp_cong.c
tcp_cubic.c tcp: cubic: fix bug in bictcp_acked() 2013-08-07 10:35:08 -07:00
tcp_diag.c
tcp_fastopen.c tcp: switch tcp_fastopen key generation to net_get_random_once 2013-10-19 19:45:35 -04:00
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c
tcp_illinois.c
tcp_input.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-10-23 16:49:34 -04:00
tcp_ipv4.c tcp_memcontrol: Remove the per netns control. 2013-10-21 18:43:02 -04:00
tcp_lp.c
tcp_memcontrol.c tcp_memcontrol: Kill struct tcp_memcontrol 2013-10-21 18:43:02 -04:00
tcp_metrics.c inet: includes a sock_common in request_sock 2013-10-10 00:08:07 -04:00
tcp_minisocks.c ipv6: make lookups simpler and faster 2013-10-09 00:01:25 -04:00
tcp_offload.c ipv6: sit: add GSO/TSO support 2013-10-21 18:49:39 -04:00
tcp_output.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-10-23 16:49:34 -04:00
tcp_probe.c ipv6: make lookups simpler and faster 2013-10-09 00:01:25 -04:00
tcp_scalable.c
tcp_timer.c ipv6: make lookups simpler and faster 2013-10-09 00:01:25 -04:00
tcp_vegas.c
tcp_vegas.h net: ipv4/ipv6: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
tcp_veno.c
tcp_westwood.c
tcp_yeah.c
tcp.c tcp_memcontrol: Remove the per netns control. 2013-10-21 18:43:02 -04:00
tunnel4.c
udp_diag.c
udp_impl.h net: ipv4/ipv6: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
udp_offload.c ipip: add GSO/TSO support 2013-10-19 19:36:19 -04:00
udp.c inet: convert inet_ehash_secret and ipv6_hash_secret to net_get_random_once 2013-10-19 19:45:35 -04:00
udplite.c
xfrm4_input.c
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2013-09-30 15:24:57 -04:00
xfrm4_output.c xfrm: revert ipv4 mtu determination to dst_mtu 2013-08-26 12:40:53 +02:00
xfrm4_policy.c xfrm: Decode sessions with output interface. 2013-09-16 09:39:43 +02:00
xfrm4_state.c xfrm: make local error reporting more robust 2013-08-14 13:07:12 +02:00
xfrm4_tunnel.c