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58a4782449
linux/net/ipv6
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Eric Dumazet 58a4782449 ipv6: sit: update mtu check to take care of gso packets 
While testing my changes for TSO support in SIT devices,
I was using sit0 tunnel which appears to include nopmtudisc flag.

But using :

ip tun add sittun mode sit remote $REMOTE_IPV4 local $LOCAL_IPV4 \
   dev $IFACE

We get a tunnel which rejects too long packets because of the mtu check
which is not yet GSO aware.

erd:~# ip tunnel
sittun: ipv6/ip  remote 10.246.17.84  local 10.246.17.83  ttl inherit  6rd-prefix 2002::/16
sit0: ipv6/ip  remote any  local any  ttl 64  nopmtudisc 6rd-prefix 2002::/16

This patch is based on an excellent report from
Michal Shmidt.

In the future, we probably want to extend the MTU check to do the
right thing for GSO packets...

Fixes: ("61c1db7fae21 ipv6: sit: add GSO/TSO support")
Reported-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Tested-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-18 17:55:24 -05:00
..
netfilter netfilter: SYNPROXY target: restrict to INPUT/FORWARD 2013-12-11 11:30:25 +01:00
addrconf_core.c ipv6: move in6_dev_finish_destroy() into core kernel 2013-08-31 22:30:00 -04:00
addrconf.c ipv6: fix third arg of anycast_dst_alloc(), must be bool. 2013-12-02 17:13:25 -05:00
addrlabel.c ipv6: fix null pointer dereference in __ip6addrlbl_add 2013-09-04 14:14:53 -04:00
af_inet6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-11-19 15:50:47 -08:00
ah6.c ipsec: Don't update the pmtu on ICMPV6_DEST_UNREACH 2013-09-16 09:45:32 +02:00
anycast.c net: proc: change proc_net_remove to remove_proc_entry 2013-02-18 14:53:08 -05:00
datagram.c ipv6: do not erase dst address with flow label destination 2013-12-10 22:51:00 -05:00
esp6.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2013-11-02 02:13:48 -04:00
exthdrs_core.c ipv6: Correct comparisons and calculations using skb->tail and skb-transport_header 2013-05-28 23:49:07 -07:00
exthdrs_offload.c ipv6: Pull IPv6 GSO registration out of the module 2012-11-15 17:39:24 -05:00
exthdrs.c ipv6/exthdrs: accept tlv which includes only padding 2013-09-11 15:52:27 -04:00
fib6_rules.c inet: fix NULL pointer Oops in fib(6)_rule_suppress 2013-12-10 17:54:23 -05:00
icmp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-09-05 14:58:52 -04:00
inet6_connection_sock.c inet: rename ir_loc_port to ir_num 2013-10-10 14:37:35 -04:00
inet6_hashtables.c inet: convert inet_ehash_secret and ipv6_hash_secret to net_get_random_once 2013-10-19 19:45:35 -04:00
ip6_checksum.c ipv6: move csum_ipv6_magic() and udp6_csum_init() into static library 2013-01-08 17:56:10 -08:00
ip6_fib.c ipv6: compare sernum when walking fib for /proc/net/ipv6_route as safety net 2013-09-27 17:32:17 -04:00
ip6_flowlabel.c ipv6: protect for_each_sk_fl_rcu in mem_check with rcu_read_lock_bh 2013-11-11 01:25:28 -05:00
ip6_gre.c net: Explicitly initialize u64_stats_sync structures for lockdep 2013-11-06 12:40:25 +01:00
ip6_icmp.c ipv6: Kill ipv6 dependency of icmpv6_send(). 2013-04-29 13:54:36 -04:00
ip6_input.c net: add SNMP counters tracking incoming ECN bits 2013-08-08 22:24:59 -07:00
ip6_offload.c ipv6: sit: add GSO/TSO support 2013-10-21 18:49:39 -04:00
ip6_offload.h ipv6: Pull IPv6 GSO registration out of the module 2012-11-15 17:39:24 -05:00
ip6_output.c ipv6: pmtudisc setting not respected with UFO/CORK 2013-12-18 17:52:15 -05:00
ip6_tunnel.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-11-19 15:50:47 -08:00
ip6_vti.c ipv6: Add support for IPsec virtual tunnel interfaces 2013-10-10 12:00:01 +02:00
ip6mr.c tunnels: harmonize cleanup done on skb on rx path 2013-09-04 00:27:26 -04:00
ipcomp6.c ipsec: Don't update the pmtu on ICMPV6_DEST_UNREACH 2013-09-16 09:45:32 +02:00
ipv6_sockglue.c ipv6: enable IPV6_FLOWLABEL_MGR for getsockopt 2013-11-08 13:42:57 -05:00
Kconfig ipv6: Remove privacy config option. 2013-10-28 20:07:50 -04:00
Makefile ipv6: Add support for IPsec virtual tunnel interfaces 2013-10-10 12:00:01 +02:00
mcast.c ipv6 mcast: use in6_dev_put in timer handlers instead of __in6_dev_put 2013-09-30 22:28:58 -07:00
mip6.c ipv6: Correct comparisons and calculations using skb->tail and skb-transport_header 2013-05-28 23:49:07 -07:00
ndisc.c ipv6: judge the accept_ra_defrtr before calling rt6_route_rcv 2013-12-02 16:00:38 -05:00
netfilter.c netfilter: add nf_ipv6_ops hook to fix xt_addrtype with IPv6 2013-05-23 11:58:55 +02:00
output_core.c ipv6: move ip6_local_out into core kernel 2013-08-31 22:30:00 -04:00
ping.c inet: fix addr_len/msg->msg_namelen assignment in recv_error and rxpmtu functions 2013-11-23 14:46:23 -08:00
proc.c net: add SNMP counters tracking incoming ECN bits 2013-08-08 22:24:59 -07:00
protocol.c net: remove outdated comment for ipv4 and ipv6 protocol handler 2013-11-28 18:47:51 -05:00
raw.c ipv6: do not erase dst address with flow label destination 2013-12-10 22:51:00 -05:00
reassembly.c ipv6: split inet6_hash_frag for netfilter and initialize secrets with net_get_random_once 2013-10-23 17:01:40 -04:00
route.c ipv6: don't count addrconf generated routes against gc limit 2013-12-09 21:00:39 -05:00
sit.c ipv6: sit: update mtu check to take care of gso packets 2013-12-18 17:55:24 -05:00
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_ipv6.c net: Convert uses of typedef ctl_table to struct ctl_table 2013-06-13 02:36:09 -07:00
tcp_ipv6.c ipv6: do not erase dst address with flow label destination 2013-12-10 22:51:00 -05:00
tcpv6_offload.c gro: Clean up tcpX_gro_receive checksum verification 2013-11-23 14:46:19 -08:00
tunnel6.c net: ipv6: Standardize prefixes for message logging 2012-05-16 01:01:03 -04:00
udp_impl.h net: ipv4/ipv6: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
udp_offload.c ipv6: fix headroom calculation in udp6_ufo_fragment 2013-11-05 22:09:53 -05:00
udp.c ipv6: do not erase dst address with flow label destination 2013-12-10 22:51:00 -05:00
udplite.c ipv6: do not clear pinet6 field 2013-05-11 16:26:38 -07:00
xfrm6_input.c
xfrm6_mode_beet.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm6_mode_ro.c
xfrm6_mode_transport.c
xfrm6_mode_tunnel.c ipv6: Add a receive path hook for vti6 in xfrm6_mode_tunnel. 2013-10-09 13:16:36 +02:00
xfrm6_output.c xfrm: revert ipv4 mtu determination to dst_mtu 2013-08-26 12:40:53 +02:00
xfrm6_policy.c xfrm: Fix null pointer dereference when decoding sessions 2013-11-01 07:08:46 +01:00
xfrm6_state.c xfrm: make local error reporting more robust 2013-08-14 13:07:12 +02:00
xfrm6_tunnel.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00