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linux/net/ipv6
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Willem de Bruijn 08676246d8 udp: consistently apply ufo or fragmentation 
commit 85f1bd9a7b upstream.

When iteratively building a UDP datagram with MSG_MORE and that
datagram exceeds MTU, consistently choose UFO or fragmentation.

Once skb_is_gso, always apply ufo. Conversely, once a datagram is
split across multiple skbs, do not consider ufo.

Sendpage already maintains the first invariant, only add the second.
IPv6 does not have a sendpage implementation to modify.

A gso skb must have a partial checksum, do not follow sk_no_check_tx
in udp_send_skb.

Found by syzkaller.

Fixes: e89e9cf539 ("[IPv4/IPv6]: UFO Scatter-gather approach")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.16:
 - ip6_append_data() doesn't take a queue parameter; use &sk->sk_write_queue
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
History 2017-08-26 02:14:49 +01:00
..
netfilter netfilter: rpfilter: fix incorrect loopback packet judgment 2017-03-16 02:26:59 +00:00
addrconf.c ipv6: addrconf: Avoid addrconf_disable_change() using RCU read-side lock 2017-03-16 02:27:23 +00:00
addrconf_core.c ipv6: remove rt6i_genid 2014-10-15 12:05:29 +02:00
addrlabel.c ipv6/addrlabel: fix ip6addrlbl_get() 2016-01-25 10:44:00 +00:00
af_inet6.c ipv6: move stub initialization after ipv6 setup completion 2017-07-18 18:40:39 +01:00
ah6.c ah6: Use the IPsec protocol multiplexer API 2014-03-14 07:28:07 +01:00
anycast.c ipv6: restore the behavior of ipv6_sock_ac_drop() 2014-10-15 12:05:28 +02:00
datagram.c ipv6/udp: use sticky pktinfo egress ifindex on connect() 2016-03-09 10:38:49 +00:00
esp6.c esp6: Use the IPsec protocol multiplexer API 2014-03-14 07:28:07 +01:00
exthdrs.c ipv6: Need to export ipv6_push_frag_opts for tunneling now. 2017-08-26 02:14:43 +01:00
exthdrs_core.c ipv6: re-enable fragment header matching in ipv6_find_hdr 2016-03-24 10:01:14 +00:00
exthdrs_offload.c ipv6: fix exthdrs offload registration in out_rt path 2015-09-30 13:20:50 +01:00
fib6_rules.c ipv6: fix backtracking for throw routes 2015-03-24 10:34:13 +00:00
icmp.c ipv6: fix endianness error in icmpv6_err 2016-08-22 22:38:15 +01:00
inet6_connection_sock.c ipv6: add complete rcu protection around np->opt 2015-12-18 16:06:24 +00:00
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 udp: Generic functions to set checksum 2014-06-04 22:46:38 -07:00
ip6_fib.c ipv6: make ECMP route replacement less greedy 2017-07-18 18:40:12 +01:00
ip6_flowlabel.c ipv6: fix a lockdep splat 2016-02-25 10:51:01 +00:00
ip6_gre.c ip6_tunnel: must reload ipv6h in ip6ip6_tnl_xmit() 2017-03-16 02:27:05 +00:00
ip6_icmp.c ipv6: Kill ipv6 dependency of icmpv6_send(). 2013-04-29 13:54:36 -04:00
ip6_input.c ipv6: Make MLD packets to only be processed locally 2015-08-10 17:10:15 +01:00
ip6_offload.c ipv6: Check ip6_find_1stfragopt() return value properly. 2017-06-05 21:17:24 +01:00
ip6_offload.h ipv6: Pull IPv6 GSO registration out of the module 2012-11-15 17:39:24 -05:00
ip6_output.c udp: consistently apply ufo or fragmentation 2017-08-26 02:14:49 +01:00
ip6_tunnel.c ip6_tunnel: Fix missing tunnel encapsulation limit option 2017-08-26 02:14:43 +01:00
ip6_vti.c vti6: fix uninit when using x-netns 2015-05-06 11:33:05 +01:00
ip6mr.c ipmr/ip6mr: Initialize the last assert time of mfc entries. 2017-03-16 02:27:17 +00:00
ipcomp6.c ipcomp6: Use the IPsec protocol multiplexer API 2014-03-14 07:28:07 +01:00
ipv6_sockglue.c ipv6: add complete rcu protection around np->opt 2015-12-18 16:06:24 +00:00
Kconfig ip6_vti: Fix build when NET_IP_TUNNEL is not set. 2014-02-20 14:29:49 +01:00
Makefile xfrm6: Add IPsec protocol multiplexer 2014-03-14 07:28:07 +01:00
mcast.c igmp, mld: Fix memory leak in igmpv3/mld_del_delrec() 2017-03-16 02:27:26 +00:00
mip6.c ipv4/ipv6: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00
ndisc.c net: ipv6: send unsolicited NA on admin up 2017-08-26 02:14:33 +01:00
netfilter.c netfilter: Fix potential use after free in ip6_route_me_harder() 2014-05-09 02:36:39 +02:00
output_core.c ipv6: avoid overflow of offset in ip6_find_1stfragopt 2017-08-26 02:14:48 +01:00
ping.c net: ping: Return EAFNOSUPPORT when appropriate. 2015-03-12 16:45:17 +00:00
proc.c snmp: fix some left over of snmp stats 2014-05-14 15:33:47 -04:00
protocol.c net: remove outdated comment for ipv4 and ipv6 protocol handler 2013-11-28 18:47:51 -05:00
raw.c ipv6: handle -EFAULT from skb_copy_bits 2017-03-16 02:27:22 +00:00
reassembly.c ipv6: distinguish frag queues by device for multicast and link-local packets 2015-12-18 16:06:23 +00:00
route.c net: ipv6: set route type for anycast routes 2017-07-18 18:40:18 +01:00
sit.c sit: fix a double free on error path 2017-03-16 02:27:25 +00:00
syncookies.c ipv6: add complete rcu protection around np->opt 2015-12-18 16:06:24 +00:00
sysctl_net_ipv6.c net: add a sysctl to reflect the fwmark on replies 2014-05-13 18:35:08 -04:00
tcp_ipv6.c dccp/tcp: fix routing redirect race 2017-07-18 18:40:12 +01:00
tcpv6_offload.c net-gre-gro: Fix a bug that breaks the forwarding path 2014-07-16 14:45:26 -07:00
tunnel6.c ipv6: fix tunnel error handling 2015-12-13 17:49:43 +00:00
udp.c udp: prevent skbs lingering in tunnel socket queues 2017-03-16 02:27:17 +00:00
udp_impl.h net: ipv4/ipv6: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
udp_offload.c ipv6: Check ip6_find_1stfragopt() return value properly. 2017-06-05 21:17:24 +01:00
udplite.c net: Eliminate no_check from protosw 2014-05-23 16:28:53 -04:00
xfrm6_input.c netfilter: ipv6: use NFPROTO values for NF_HOOK invocation 2010-03-25 16:00:49 +01:00
xfrm6_mode_beet.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm6_mode_ro.c ipv4/ipv6: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00
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 ipv6: update skb->csum when CE mark is propagated 2016-01-28 11:06:06 +00:00
xfrm6_output.c ipv6: Fix IPsec pre-encap fragmentation check 2015-11-16 11:27:17 +00:00
xfrm6_policy.c xfrm: dst_entries_init() per-net dst_ops 2016-01-28 11:57:51 +00:00
xfrm6_protocol.c xfrm6: Properly handle unsupported protocols 2014-05-06 07:08:38 +02:00
xfrm6_state.c xfrm: make local error reporting more robust 2013-08-14 13:07:12 +02:00
xfrm6_tunnel.c ipv4/ipv6: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00