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linux/include/net
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Sabrina Dubroca 2b7e4c7359 net: ipv4: update fnhe_pmtu when first hop's MTU changes 
[ Upstream commit af7d6cce53 ]

Since commit 5aad1de5ea ("ipv4: use separate genid for next hop
exceptions"), exceptions get deprecated separately from cached
routes. In particular, administrative changes don't clear PMTU anymore.

As Stefano described in commit e9fa1495d7 ("ipv6: Reflect MTU changes
on PMTU of exceptions for MTU-less routes"), the PMTU discovered before
the local MTU change can become stale:
 - if the local MTU is now lower than the PMTU, that PMTU is now
   incorrect
 - if the local MTU was the lowest value in the path, and is increased,
   we might discover a higher PMTU

Similarly to what commit e9fa1495d7 did for IPv6, update PMTU in those
cases.

If the exception was locked, the discovered PMTU was smaller than the
minimal accepted PMTU. In that case, if the new local MTU is smaller
than the current PMTU, let PMTU discovery figure out if locking of the
exception is still needed.

To do this, we need to know the old link MTU in the NETDEV_CHANGEMTU
notifier. By the time the notifier is called, dev->mtu has been
changed. This patch adds the old MTU as additional information in the
notifier structure, and a new call_netdevice_notifiers_u32() function.

Fixes: 5aad1de5ea ("ipv4: use separate genid for next hop exceptions")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-10-20 09:52:36 +02:00
..
9p 9p: switch p9_client_read() to passing struct iov_iter * 2015-04-11 22:28:27 -04:00
bluetooth Bluetooth: Fix connection if directed advertising and privacy is used 2018-07-03 11:21:35 +02:00
caif caif: fix a signedness bug in cfpkt_iterate() 2015-02-20 17:35:14 -05:00
irda irda: Convert function pointer arrays and uses to const 2014-12-10 15:33:16 -05:00
iucv s390/iucv: do not use arrays as argument 2015-09-21 16:03:04 -07:00
netfilter netfilter: nf_queue: Make the queue_handler pernet 2018-02-16 20:09:40 +01:00
netns netfilter: ipv6: nf_defrag: reduce struct net memory waste 2018-08-24 13:26:53 +02:00
nfc NFC: Fix the number of pipes 2018-09-29 03:08:51 -07:00
phonet
sctp sctp: potential read out of bounds in sctp_ulpevent_type_enabled() 2017-10-21 17:09:01 +02:00
tc_act act_connmark: Remember the struct net instead of guessing it. 2015-09-18 21:59:31 +02:00
6lowpan.h 6lowpan: remove lowpan_is_addr_broadcast 2015-10-21 00:49:25 +02:00
act_api.h net_sched: make tcf_hash_destroy() static 2015-08-26 11:01:44 -07:00
addrconf.h ipv6: reorder ip6_route_dev_notifier after ipv6_dev_notf 2017-05-14 13:32:58 +02:00
af_ieee802154.h ieee802154: af_ieee802154: fix typo in comment. 2015-09-17 13:20:05 +02:00
af_rxrpc.h af_rxrpc.h: Remove extern from function prototypes 2013-07-31 17:50:01 -07:00
af_unix.h af_unix: split 'u->readlock' into two: 'iolock' and 'bindlock' 2016-09-30 10:18:36 +02:00
af_vsock.h vsock: split dwork to avoid reinitializations 2018-08-22 07:48:35 +02:00
ah.h ipsec: Remove obsolete MAX_AH_AUTH_LEN 2014-09-18 10:54:36 +02:00
arp.h ipv4: Make neigh lookup keys for loopback/point-to-point devices be INADDR_ANY 2018-01-31 12:06:14 +01:00
atmclip.h
ax25.h ax25: Stop using sock->sk_protinfo. 2015-06-28 16:55:44 -07:00
ax88796.h
bond_3ad.h bonding: simplify / unify event handling code for 3ad mode. 2015-11-02 22:52:24 -05:00
bond_alb.h net: Move bonding headers under include/net 2014-11-10 13:27:49 -05:00
bond_options.h bonding: convert num_grat_arp to the new bonding option API 2015-07-27 01:05:24 -07:00
bonding.h bonding: avoid possible dead-lock 2018-10-20 09:52:36 +02:00
busy_poll.h sched, net: Fixup busy_loop_us_clock() 2014-01-13 17:39:11 +01:00
cfg80211-wext.h
cfg80211.h cfg80211: make RATE_INFO_BW_20 the default 2018-04-13 19:50:00 +02:00
cfg802154.h nl802154: add support for security layer 2015-09-30 13:16:44 +02:00
checksum.h net: Add inet_proto_csum_replace_by_diff utility function 2015-08-17 21:33:06 -07:00
cipso_ipv4.h netlabel: out of bound access in cipso_v4_validate() 2017-02-18 16:39:26 +01:00
cls_cgroup.h cls_cgroup: factor out classid retrieval 2015-07-20 12:41:30 -07:00
codel.h net_sched: update hierarchical backlog too 2016-05-18 17:06:39 -07:00
compat.h net: switch importing msghdr from userland to {compat_,}import_iovec() 2015-04-09 00:02:26 -04:00
datalink.h net: Move prototype declaration to header file include/net/datalink.h from net/ipx/af_ipx.c 2014-02-09 17:32:50 -08:00
dcbevent.h include/net/: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00
dcbnl.h net/dcb: Add IEEE QCN attribute 2015-03-06 21:50:02 -05:00
dn_dev.h dn_dev: add support for IFA_FLAGS nl attribute 2013-12-10 21:50:00 -05:00
dn_fib.h decnet (dn*.h): Remove extern from function prototypes 2013-09-20 14:49:32 -04:00
dn_neigh.h netfilter: Pass net into okfn 2015-09-17 17:18:37 -07:00
dn_nsp.h decnet (dn*.h): Remove extern from function prototypes 2013-09-20 14:49:32 -04:00
dn_route.h net: Move prototype declaration to appropriate header file from decnet/af_decnet.c 2014-02-09 17:32:49 -08:00
dn.h net: Move prototype declaration to header file include/net/dn.h from net/decnet/af_decnet.c 2014-02-09 17:32:49 -08:00
dsa.h net: dsa: use switchdev obj for VLAN add/del ops 2015-11-01 15:56:11 -05:00
dsfield.h
dst_cache.h net: add dst_cache support 2018-02-25 11:03:34 +01:00
dst_metadata.h gro: Make GRO aware of lightweight tunnels. 2016-03-03 15:07:04 -08:00
dst_ops.h ipv4, ipv6: Pass net into __ip_local_out and __ip6_local_out 2015-10-08 04:27:02 -07:00
dst.h ipv4: add reference counting to metrics 2017-06-07 12:05:59 +02:00
esp.h net: move pskb_put() to core code 2013-11-07 19:28:58 -05:00
ethoc.h net/ethoc: support big-endian register layout 2015-09-23 15:33:15 -07:00
fib_rules.h net: ipv6: use common fib_default_rule_pref 2015-09-09 14:19:50 -07:00
firewire.h
flow_dissector.h flow_dissector: Don't use bit fields. 2015-09-01 16:46:08 -07:00
flow.h net: Rename FLOWI_FLAG_VRFSRC to FLOWI_FLAG_L3MDEV_SRC 2015-10-07 04:27:42 -07:00
flowcache.h flowcache: Make flow cache name space aware 2014-02-12 07:02:11 +01:00
fou.h ip_tunnel: Ops registration for secondary encap (fou, gue) 2014-11-12 15:01:35 -05:00
garp.h garp.h: Remove extern from function prototypes 2013-09-20 14:49:33 -04:00
gen_stats.h net: sched: enable per cpu qstats 2014-09-30 01:02:26 -04:00
genetlink.h netlink: add a start callback for starting a netlink dump 2017-12-05 11:22:49 +01:00
geneve.h geneve: Consolidate Geneve functionality in single module. 2015-08-27 15:42:48 -07:00
gre.h gre: Remove support for sharing GRE protocol hook. 2015-08-10 14:03:54 -07:00
gro_cells.h gro_cells: remove spinlock protecting receive queues 2015-08-31 15:17:17 -07:00
gue.h gue: Protocol constants for remote checksum offload 2014-11-05 16:30:03 -05:00
icmp.h icmp.h: Remove extern from function prototypes 2013-09-20 14:49:33 -04:00
ieee80211_radiotap.h mac80211: propagate STBC / LDPC flags to radiotap 2014-02-06 09:34:58 +01:00
ieee802154_netdev.h nl802154: add support for security layer 2015-09-30 13:16:44 +02:00
if_inet6.h ipv6: do retries on stable privacy addresses 2015-03-23 22:12:09 -04:00
inet_common.h net: avoid NULL deref in inet_ctl_sock_destroy() 2015-11-02 22:46:09 -05:00
inet_connection_sock.h tcp/dccp: fix another race at listener dismantle 2016-03-03 15:07:07 -08:00
inet_ecn.h ipv6: update skb->csum when CE mark is propagated 2016-01-31 11:29:01 -08:00
inet_frag.h Revert "net: fix percpu memory leaks" 2017-09-27 11:00:11 +02:00
inet_hashtables.h tcp/dccp: fix hashdance race for passive sessions 2015-10-23 05:42:21 -07:00
inet_sock.h tcp/dccp: fix other lockdep splats accessing ireq_opt 2017-11-18 11:11:07 +01:00
inet_timewait_sock.h soreuseport: initialise timewait reuseport field 2018-05-16 10:06:50 +02:00
inet6_connection_sock.h ipv6: remove obsolete inet6 functions 2015-10-03 04:32:42 -07:00
inet6_hashtables.h ipv6: get rid of __inet6_hash() 2015-03-18 22:00:35 -04:00
inetpeer.h inet: tcp: fix inetpeer_set_addr_v4() 2015-12-16 00:14:12 -05:00
ip_fib.h net: ipv4: update fnhe_pmtu when first hop's MTU changes 2018-10-20 09:52:36 +02:00
ip_tunnels.h ip_tunnel: replace dst_cache with generic implementation 2018-02-28 10:17:21 +01:00
ip_vs.h ipvs: drop first packet to redirect conntrack 2016-05-11 11:21:09 +02:00
ip.h ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu 2018-05-30 07:49:04 +02:00
ip6_checksum.h net: add gro_compute_pseudo functions 2014-08-24 18:09:23 -07:00
ip6_fib.h ipv6: fix sparse warning on rt6i_node 2017-09-27 11:00:10 +02:00
ip6_route.h net: ipv6: Compare lwstate in detecting duplicate nexthops 2017-07-21 07:44:55 +02:00
ip6_tunnel.h net: replace dst_cache ip6_tunnel implementation with the generic one 2018-02-25 11:03:34 +01:00
ipcomp.h
ipconfig.h
ipv6.h ipv6: fix useless rol32 call on hash 2018-07-25 10:18:16 +02:00
ipx.h switch ipxrtr_route_packet() from iovec to msghdr 2014-11-24 04:28:49 -05:00
iw_handler.h wext: handle NULL extra data in iwe_stream_add_point better 2017-08-11 09:08:56 -07:00
l3mdev.h net: Propagate lookup failure in l3mdev_get_saddr to caller 2016-01-04 22:58:30 -05:00
lapb.h lapb.h: Remove extern from function prototypes 2013-09-21 14:01:38 -04:00
lib80211.h lib80211: remove unused print_ssid() 2014-10-14 02:18:27 +02:00
llc_c_ac.h llc*.h: Remove extern from function prototypes 2013-09-21 14:01:38 -04:00
llc_c_ev.h llc*.h: Remove extern from function prototypes 2013-09-21 14:01:38 -04:00
llc_c_st.h llc: Make llc_conn_ev_qfyr_t function pointer arrays const 2014-12-10 15:21:24 -05:00
llc_conn.h llc: properly handle dev_queue_xmit() return value 2018-05-30 07:49:06 +02:00
llc_if.h llc*.h: Remove extern from function prototypes 2013-09-21 14:01:38 -04:00
llc_pdu.h net: llc: fix order of evaluation in llc_conn_ac_inc_vr_by_1 2014-01-01 22:22:43 -05:00
llc_s_ac.h llc*.h: Remove extern from function prototypes 2013-09-21 14:01:38 -04:00
llc_s_ev.h llc*.h: Remove extern from function prototypes 2013-09-21 14:01:38 -04:00
llc_s_st.h llc: Make llc_sap_action_t function pointer arrays const 2014-12-10 15:21:24 -05:00
llc_sap.h llc*.h: Remove extern from function prototypes 2013-09-21 14:01:38 -04:00
llc.h llc: use refcount_inc_not_zero() for llc_sap_find() 2018-08-22 07:48:35 +02:00
lwtunnel.h dst: Pass net into dst->output 2015-10-08 04:27:03 -07:00
mac80211.h mac80211: round IEEE80211_TX_STATUS_HEADROOM up to multiple of 4 2018-05-30 07:48:59 +02:00
mac802154.h 6lowpan: cleanup lowpan_header_decompress 2015-10-21 00:49:24 +02:00
mip6.h include/net/: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00
mld.h ipv6: mld: answer mldv2 queries with mldv1 reports in mldv1 fallback 2014-09-22 16:23:15 -04:00
mpls_iptunnel.h mpls: multipath route support 2015-10-23 06:26:42 -07:00
mpls.h openvswitch: Add basic MPLS support to kernel 2014-11-05 23:52:33 -08:00
mrp.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-10-01 17:06:14 -04:00
ndisc.h Revert "ipv6: ndisc: inherit metadata dst when creating ndisc requests" 2015-12-01 15:07:59 -05:00
neighbour.h net: add explicit logging and stat for neighbour table overflow 2015-08-10 13:46:21 -07:00
net_namespace.h netfilter: ipv6: nf_defrag: reduce struct net memory waste 2018-08-24 13:26:53 +02:00
net_ratelimit.h
netevent.h netevent/netlink.h: Remove extern from function prototypes 2013-09-21 14:01:39 -04:00
netlabel.h netlabel: fix the netlbl_catmap_setlong() dummy function 2014-08-07 20:55:21 -04:00
netlink.h netlink: fix nla_put_{u8,u16,u32} for KASAN 2018-02-25 11:03:51 +01:00
netprio_cgroup.h cgroup: clean up cgroup_subsys names and initialization 2014-02-08 10:36:58 -05:00
netrom.h netrom.h: Remove extern from function prototypes 2013-09-21 14:01:39 -04:00
nexthop.h net: fix rtnh_ok() 2018-05-16 10:06:50 +02:00
nl802154.h nl802154: add support for security layer 2015-09-30 13:16:44 +02:00
p8022.h p8022.h: Remove extern from function prototypes 2013-09-21 14:01:39 -04:00
ping.h net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
pkt_cls.h net: sched: remove tcf_proto from ematch calls 2014-10-06 18:02:32 -04:00
pkt_sched.h net: sched: consolidate tc_classify{,_compat} 2015-08-27 14:18:48 -07:00
protocol.h net: Eliminate no_check from protosw 2014-05-23 16:28:53 -04:00
psnap.h psnap.h: Remove extern from function prototypes 2013-09-23 01:51:08 -04:00
raw.h raw/rawv6.h: Remove extern from function prototypes 2013-09-23 01:51:08 -04:00
rawv6.h raw/rawv6.h: Remove extern from function prototypes 2013-09-23 01:51:08 -04:00
red.h net_sched: red: Avoid illegal values 2018-02-25 11:03:40 +01:00
regulatory.h regulatory: add NUL to request alpha2 2018-05-30 07:49:00 +02:00
request_sock.h tcp/dccp: fix race at listener dismantle phase 2015-10-16 00:52:19 -07:00
rose.h rose.h: Remove extern from function prototypes 2013-09-23 01:51:08 -04:00
route.h ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu 2018-05-30 07:49:04 +02:00
rtnetlink.h netlink: Rightsize IFLA_AF_SPEC size calculation 2015-10-21 19:15:20 -07:00
sch_generic.h net_sched: fix order of queue length updates in qdisc_replace() 2017-08-30 10:19:21 +02:00
scm.h unix: correctly track in-flight fds in sending process user_struct 2016-03-03 15:07:05 -08:00
secure_seq.h inetpeer: get rid of ip_id_count 2014-06-02 11:00:41 -07:00
slhc_vj.h slip: Check if rstate is initialized before uncompressing 2018-04-24 09:32:04 +02:00
snmp.h Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2014-10-15 07:48:18 +02:00
sock.h tcp: increment sk_drops for dropped rx packets 2018-10-13 09:11:34 +02:00
Space.h drivers: net: Include new header file in sbni.c 2013-12-19 18:51:20 -05:00
stp.h stp.h: Remove extern from function prototypes 2013-09-23 01:51:09 -04:00
switchdev.h switchdev: pass pointer to fib_info instead of copy 2016-06-24 10:18:16 -07:00
tcp_memcontrol.h tcp_memcontrol: Kill struct tcp_memcontrol 2013-10-21 18:43:02 -04:00
tcp_states.h inet: add TCP_NEW_SYN_RECV state 2015-03-12 22:58:12 -04:00
tcp.h tcp: use an RB tree for ooo receive queue 2018-10-13 09:11:34 +02:00
timewait_sock.h inet: remove BUG_ON() in twsk_destructor() 2015-07-09 15:12:20 -07:00
transp_v6.h ipv6: make IPV6_RECVPKTINFO work for ipv4 datagrams 2014-01-19 19:53:18 -08:00
tso.h net: tso: add support for IPv6 2015-10-26 22:24:22 -07:00
udp_tunnel.h vxlan: do not receive IPv4 packets on IPv6 socket 2015-08-29 13:07:54 -07:00
udp.h net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
udplite.h udplite: fix partial checksum initialization 2018-03-11 16:19:46 +01:00
vsock_addr.h
vxlan.h vxlan: fix incorrect RCO bit in VXLAN header 2015-12-05 18:15:29 -05:00
wext.h wext.h: Remove extern from function prototypes 2013-09-23 16:29:40 -04:00
wimax.h net: treewide: Fix typo found in DocBook/networking.xml 2014-09-05 17:35:28 -07:00
x25.h net: x25: fix one potential use-after-free issue 2018-04-13 19:50:07 +02:00
x25device.h
xfrm.h xfrm: fix stack access out of bounds with CONFIG_XFRM_SUB_POLICY 2017-07-05 14:37:21 +02:00