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linux-next/net/ipv6
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Maciej Żenczykowski 09454fd0a4 Revert "ipv6: add mtu lock check in __ip6_rt_update_pmtu" 
This reverts commit 19bda36c42:

| ipv6: add mtu lock check in __ip6_rt_update_pmtu
|
| Prior to this patch, ipv6 didn't do mtu lock check in ip6_update_pmtu.
| It leaded to that mtu lock doesn't really work when receiving the pkt
| of ICMPV6_PKT_TOOBIG.
|
| This patch is to add mtu lock check in __ip6_rt_update_pmtu just as ipv4
| did in __ip_rt_update_pmtu.

The above reasoning is incorrect.  IPv6 *requires* icmp based pmtu to work.
There's already a comment to this effect elsewhere in the kernel:

  $ git grep -p -B1 -A3 'RTAX_MTU lock'
  net/ipv6/route.c=4813=

  static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg)
  ...
    /* In IPv6 pmtu discovery is not optional,
       so that RTAX_MTU lock cannot disable it.
       We still use this lock to block changes
       caused by addrconf/ndisc.
    */

This reverts to the pre-4.9 behaviour.

Cc: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Xin Long <lucien.xin@gmail.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Fixes: 19bda36c42 ("ipv6: add mtu lock check in __ip6_rt_update_pmtu")
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-07 17:29:12 -07:00
..
ila net: add net available in build_state 2020-03-29 22:30:57 -07:00
netfilter netfilter: Replace zero-length array with flexible-array member 2020-03-15 15:20:16 +01:00
addrconf_core.c net: ipv6_stub: use ip6_dst_lookup_flow instead of ip6_dst_lookup 2019-12-04 12:27:13 -08:00
addrconf.c neigh: support smaller retrans_time settting 2020-04-02 17:55:26 -07:00
addrlabel.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
af_inet6.c net: ipv6: add rpl sr tunnel 2020-03-29 22:30:57 -07:00
ah6.c inet: Use fallthrough; 2020-03-12 15:55:00 -07:00
anycast.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
calipso.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
datagram.c net: ipv6: add net argument to ip6_dst_lookup_flow 2019-12-04 12:27:12 -08:00
esp6_offload.c esp6: add gso_segment for esp6 beet mode 2020-03-26 14:51:07 +01:00
esp6.c ESP: Export esp_output_fill_trailer function 2020-02-19 13:52:32 +01:00
exthdrs_core.c ipv6: remove printk 2019-07-27 14:23:48 -07:00
exthdrs_offload.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
exthdrs.c net: ipv6: add support for rpl sr exthdr 2020-03-29 22:30:57 -07:00
fib6_notifier.c net: fib_notifier: propagate extack down to the notifier block callback 2019-10-04 11:10:56 -07:00
fib6_rules.c net: fib_notifier: propagate extack down to the notifier block callback 2019-10-04 11:10:56 -07:00
fou6.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
icmp.c net: icmp6: do not select saddr from iif when route has prefsrc set 2020-04-07 18:25:10 -07:00
inet6_connection_sock.c net: add bool confirm_neigh parameter for dst_ops.update_pmtu 2019-12-24 22:28:54 -08:00
inet6_hashtables.c net: annotate accesses to sk->sk_incoming_cpu 2019-10-30 13:24:25 -07:00
ip6_checksum.c net: udp: fix handling of CHECKSUM_COMPLETE packets 2018-10-24 14:18:16 -07:00
ip6_fib.c inet: Use fallthrough; 2020-03-12 15:55:00 -07:00
ip6_flowlabel.c ipv6: fix static key imbalance in fl_create() 2019-07-11 14:43:25 -07:00
ip6_gre.c net: ip6_gre: Distribute switch variables for initialization 2020-02-20 10:00:19 -08:00
ip6_icmp.c icmp: introduce helper for nat'd source address in network device context 2020-02-13 14:19:00 -08:00
ip6_input.c bpf: Add socket assign support 2020-03-30 13:45:04 -07:00
ip6_offload.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ip6_offload.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ip6_output.c net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc. 2020-02-24 13:31:42 -08:00
ip6_tunnel.c net: ip6_gre: Distribute switch variables for initialization 2020-02-20 10:00:19 -08:00
ip6_udp_tunnel.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
ip6_vti.c vti6: Fix memory leak of skb if input policy check fails 2020-03-16 11:13:48 +01:00
ip6mr.c inet: Use fallthrough; 2020-03-12 15:55:00 -07:00
ipcomp6.c xfrm: remove type and offload_type map from xfrm_state_afinfo 2019-06-06 08:34:50 +02:00
ipv6_sockglue.c ipv6: fix restrict IPV6_ADDRFORM operation 2020-04-20 11:06:39 -07:00
Kconfig net: ipv6: add rpl sr tunnel 2020-03-29 22:30:57 -07:00
Makefile net: ipv6: add rpl sr tunnel 2020-03-29 22:30:57 -07:00
mcast_snoop.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 343 2019-06-05 17:37:07 +02:00
mcast.c mld: fix memory leak in mld_del_delrec() 2019-08-28 14:47:35 -07:00
mip6.c xfrm: remove type and offload_type map from xfrm_state_afinfo 2019-06-06 08:34:50 +02:00
ndisc.c neigh: support smaller retrans_time settting 2020-04-02 17:55:26 -07:00
netfilter.c net: ensure correct skb->tstamp in various fragmenters 2019-10-18 10:02:37 -07:00
output_core.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
ping.c ipv6: Fix the link time qualifier of 'ping_v6_proc_exit_net()' 2019-09-12 11:20:33 +01:00
proc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-07 11:00:14 -07:00
protocol.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
raw.c inet: Use fallthrough; 2020-03-12 15:55:00 -07:00
reassembly.c inet: frags: re-introduce skb coalescing for local delivery 2019-08-08 15:55:10 -07:00
route.c Revert "ipv6: add mtu lock check in __ip6_rt_update_pmtu" 2020-05-07 17:29:12 -07:00
rpl_iptunnel.c net: ipv6: rpl_iptunnel: remove redundant assignments to variable err 2020-04-02 06:57:34 -07:00
rpl.c ipv6: rpl: fix full address compression 2020-04-18 15:04:27 -07:00
seg6_hmac.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
seg6_iptunnel.c net: add net available in build_state 2020-03-29 22:30:57 -07:00
seg6_local.c net: add net available in build_state 2020-03-29 22:30:57 -07:00
seg6.c seg6: fix SRH processing to comply with RFC8754 2020-05-06 17:21:35 -07:00
sit.c sit: do not confirm neighbor when do pmtu update 2019-12-24 22:28:55 -08:00
syncookies.c mptcp: handle tcp fallback when using syn cookies 2020-01-29 17:45:20 +01:00
sysctl_net_ipv6.c ipv6: Use math to point per net sysctls into the appropriate struct net 2020-03-03 14:50:08 -08:00
tcp_ipv6.c inet: Use fallthrough; 2020-03-12 15:55:00 -07:00
tcpv6_offload.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
tunnel6.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
udp_impl.h udp6: add missing rehash callback to udplite 2019-01-17 15:01:08 -08:00
udp_offload.c udp: Support UDP fraglist GRO/GSO. 2020-01-27 11:00:21 +01:00
udp.c net: Track socket refcounts in skb_steal_sock() 2020-03-30 13:45:04 -07:00
udplite.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
xfrm6_input.c net: use skb_sec_path helper in more places 2018-12-19 11:21:37 -08:00
xfrm6_output.c xfrm: Always set XFRM_TRANSFORMED in xfrm{4,6}_output_finish 2020-04-22 12:32:11 -07:00
xfrm6_policy.c net: add bool confirm_neigh parameter for dst_ops.update_pmtu 2019-12-24 22:28:54 -08:00
xfrm6_protocol.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
xfrm6_state.c xfrm: remove eth_proto value from xfrm_state_afinfo 2019-06-06 08:34:50 +02:00
xfrm6_tunnel.c ipv6: xfrm6_tunnel.c: Use built-in RCU list checking 2020-02-27 10:17:41 +01:00