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e07c99b07ae85255d5c5bc2480fbd4c4e77f71bc
linux/include/net
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Sabrina Dubroca d52e5a7e7c ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu 
Prior to the rework of PMTU information storage in commit
2c8cec5c10 ("ipv4: Cache learned PMTU information in inetpeer."),
when a PMTU event advertising a PMTU smaller than
net.ipv4.route.min_pmtu was received, we would disable setting the DF
flag on packets by locking the MTU metric, and set the PMTU to
net.ipv4.route.min_pmtu.

Since then, we don't disable DF, and set PMTU to
net.ipv4.route.min_pmtu, so the intermediate router that has this link
with a small MTU will have to drop the packets.

This patch reestablishes pre-2.6.39 behavior by splitting
rtable->rt_pmtu into a bitfield with rt_mtu_locked and rt_pmtu.
rt_mtu_locked indicates that we shouldn't set the DF bit on that path,
and is checked in ip_dont_fragment().

One possible workaround is to set net.ipv4.route.min_pmtu to a value low
enough to accommodate the lowest MTU encountered.

Fixes: 2c8cec5c10 ("ipv4: Cache learned PMTU information in inetpeer.")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-14 13:37:36 -04:00
..
9p
9p: Implement show_options
2017-07-11 06:08:58 -04:00
bluetooth
net: annotate ->poll() instances
2017-11-27 16:20:04 -05:00
caif
caif: reduce stack size with KASAN
2018-01-19 14:02:12 -05:00
iucv
net: annotate ->poll() instances
2017-11-27 16:20:04 -05:00
netfilter
netfilter: nf_flow_offload: fix use-after-free and a resource leak
2018-02-07 11:55:52 +01:00
netns
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
2018-01-21 11:35:34 -05:00
nfc
NFC: Add nfc_dbg() macro
2017-04-05 10:15:20 +02:00
phonet
net: phonet: mark phonet_protocol as const
2017-10-07 23:15:08 +01:00
sctp
Merge tag 'usercopy-v4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2018-02-03 16:25:42 -08:00
tc_act
net/sched: act_csum: don't use spinlock in the fast path
2018-01-23 19:51:46 -05:00
6lowpan.h
6lowpan: Fix IID format for Bluetooth
2017-04-12 22:02:36 +02:00
act_api.h
net_sched: switch to exit_batch for action pernet ops
2017-12-13 13:58:41 -05:00
addrconf.h
rtnetlink: ipv6: convert remaining users to rtnl_register_module
2017-12-04 13:35:36 -05:00
af_ieee802154.h
…
af_rxrpc.h
rxrpc: Provide functions for allowing cleaner handling of signals
2017-10-18 11:42:48 +01:00
af_unix.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
af_vsock.h
VSOCK: use TCP state constants for sk_state
2017-10-05 18:44:17 -07:00
ah.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
arp.h
ipv4: Make neigh lookup keys for loopback/point-to-point devices be INADDR_ANY
2018-01-15 14:53:43 -05:00
atmclip.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ax25.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ax88796.h
…
bond_3ad.h
…
bond_alb.h
…
bond_options.h
bonding: Prevent duplicate userspace notification
2017-05-27 18:51:41 -04:00
bonding.h
bonding: remove rtmsg_ifinfo called after bond_lower_state_changed
2017-10-25 10:54:39 +09:00
busy_poll.h
net: fix compilation when busy poll is not enabled
2017-08-11 14:59:24 -07:00
calipso.h
net, calipso: convert calipso_doi.refcount from atomic_t to refcount_t
2017-07-04 22:35:16 +01:00
cfg80211-wext.h
…
cfg80211.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2018-01-17 00:10:42 -05:00
cfg802154.h
…
checksum.h
…
cipso_ipv4.h
net, ipv4: convert cipso_v4_doi.refcount from atomic_t to refcount_t
2017-07-04 01:29:04 -07:00
cls_cgroup.h
…
codel_impl.h
…
codel_qdisc.h
…
codel.h
…
compat.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
datalink.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dcbevent.h
…
dcbnl.h
…
devlink.h
mlxsw: spectrum: Fix handling of resource_size_param
2018-02-28 12:32:36 -05:00
dn_dev.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dn_fib.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dn_neigh.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dn_nsp.h
net/decnet: Convert timers to use timer_setup()
2017-10-18 12:39:36 +01:00
dn_route.h
decnet: Move dn_next into decnet route structure.
2017-11-30 09:54:25 -05:00
dn.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2017-11-04 09:26:51 +09:00
dsa.h
net: dsa: Allow compiling out legacy support
2017-12-07 14:14:54 -05:00
dsfield.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dst_cache.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dst_metadata.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2017-11-04 09:26:51 +09:00
dst_ops.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dst.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2018-01-29 10:15:51 -05:00
erspan.h
net: erspan: fix metadata extraction
2018-02-06 11:32:48 -05:00
esp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ethoc.h
…
fib_notifier.h
net: Add extack to fib_notifier_info
2017-11-01 11:50:43 +09:00
fib_rules.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
firewire.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
flow_dissector.h
tipc: improve link resiliency when rps is activated
2017-11-11 15:36:05 +09:00
flow.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fou.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fq_impl.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2017-10-30 21:09:24 +09:00
fq.h
fq: support filtering a given tin
2017-10-11 09:49:34 +02:00
garp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gen_stats.h
net: sched: add support for TCQ_F_NOLOCK subqueues to sch_mq
2017-12-08 13:32:26 -05:00
genetlink.h
genetlink: fix genlmsg_nlhdr()
2017-11-16 10:49:00 +09:00
geneve.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gre.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gro_cells.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gtp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gue.h
fou: fix some member types in guehdr
2017-12-11 14:10:06 -05:00
hwbm.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
icmp.h
…
ieee80211_radiotap.h
…
ieee802154_netdev.h
…
if_inet6.h
net, ipv6: convert ifacaddr6.aca_refcnt from atomic_t to refcount_t
2017-07-04 01:29:04 -07:00
ife.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ila.h
…
inet6_connection_sock.h
…
inet6_hashtables.h
net: ipv6: add second dif to inet6 socket lookups
2017-08-07 11:39:22 -07:00
inet_common.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
inet_connection_sock.h
vfs: do bulk POLL* -> EPOLL* replacement
2018-02-11 14:34:03 -08:00
inet_ecn.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2017-11-04 09:26:51 +09:00
inet_frag.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2017-11-04 09:26:51 +09:00
inet_hashtables.h
inet: Add a 2nd listener hashtable (port+addr)
2017-12-03 10:18:28 -05:00
inet_sock.h
net: sock: replace sk_state_load with inet_sk_state_load and remove sk_state_store
2017-12-20 14:00:25 -05:00
inet_timewait_sock.h
tcp/dccp: avoid one atomic operation for timewait hashdance
2017-12-13 14:33:10 -05:00
inetpeer.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ip6_checksum.h
…
ip6_fib.h
ipv6: Add support for non-equal-cost multipath
2018-01-10 15:14:44 -05:00
ip6_route.h
xfrm: reuse uncached_list to track xdsts
2018-02-16 07:03:33 +01:00
ip6_tunnel.h
ip6_gre: add erspan v2 support
2017-12-15 12:34:00 -05:00
ip_fib.h
ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu
2018-03-14 13:37:36 -04:00
ip_tunnels.h
net: erspan: introduce erspan v2 for ip_gre
2017-12-15 12:34:00 -05:00
ip_vs.h
netfilter: ipvs: Remove useless ipvsh param of frag_safe_skb_hp
2018-01-08 18:01:02 +01:00
ip.h
ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu
2018-03-14 13:37:36 -04:00
ipcomp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ipconfig.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ipv6.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2018-01-24 23:44:15 -05:00
ipx.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
iw_handler.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kcm.h
…
l3mdev.h
…
lapb.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
lib80211.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
llc_c_ac.h
net: LLC: Convert timers to use timer_setup()
2017-10-25 12:06:25 +09:00
llc_c_ev.h
…
llc_c_st.h
…
llc_conn.h
…
llc_if.h
…
llc_pdu.h
…
llc_s_ac.h
…
llc_s_ev.h
…
llc_s_st.h
…
llc_sap.h
…
llc.h
net, llc: convert llc_sap.refcnt from atomic_t to refcount_t
2017-07-04 22:35:15 +01:00
lwtunnel.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mac80211.h
Merge tag 'mac80211-for-davem-2018-02-22' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211
2018-02-22 15:17:01 -05:00
mac802154.h
…
mip6.h
…
mld.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mpls_iptunnel.h
net: mpls: Increase max number of labels for lwt encap
2017-04-01 20:21:44 -07:00
mpls.h
…
mrp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ncsi.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ndisc.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
neighbour.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2017-11-04 09:26:51 +09:00
net_namespace.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2018-01-29 10:15:51 -05:00
net_ratelimit.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
netevent.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2017-11-04 09:26:51 +09:00
netlabel.h
net: convert netlbl_lsm_cache.refcount from atomic_t to refcount_t
2017-07-01 07:39:09 -07:00
netlink.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
netprio_cgroup.h
…
netrom.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nexthop.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nl802154.h
…
nsh.h
openvswitch: enable NSH support
2017-11-08 16:12:33 +09:00
p8022.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ping.h
…
pkt_cls.h
pkt_cls: add new tc cls helper to check offload flag and chain index
2018-01-25 21:23:07 -05:00
pkt_sched.h
net: remove prototype of qdisc_lookup_class()
2018-01-16 14:56:54 -05:00
pptp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
protocol.h
IPv4: early demux can return an error code
2017-10-01 03:55:47 +01:00
psample.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
psnap.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
raw.h
net: ipv4: add second dif to raw socket lookups
2017-08-07 11:39:21 -07:00
rawv6.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
red.h
net_sched: red: Avoid illegal values
2017-12-05 14:37:13 -05:00
regulatory.h
regulatory: add NUL to request alpha2
2018-02-22 20:57:48 +01:00
request_sock.h
tcp: socket option to set TCP fast open key
2017-10-20 13:21:36 +01:00
rose.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
route.h
ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu
2018-03-14 13:37:36 -04:00
rtnetlink.h
rtnetlink: remove __rtnl_register
2017-12-04 11:32:53 -05:00
sch_generic.h
sch_netem: fix skb leak in netem_enqueue()
2018-03-07 11:18:14 -05:00
scm.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
secure_seq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
seg6_hmac.h
…
seg6.h
ipv6: sr: add support for ip4ip6 encapsulation
2017-08-25 17:10:23 -07:00
slhc_vj.h
…
smc.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
snmp.h
…
sock_reuseport.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sock.h
sock_diag: request _diag module only when the family or proto has been registered
2018-03-12 11:03:42 -04:00
Space.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
stp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
strparser.h
strparser: Use delayed work instead of timer for msg timeout
2017-10-25 10:37:11 +09:00
switchdev.h
net: bridge: Add/del switchdev object on host join/leave
2017-11-10 13:41:40 +09:00
tcp_states.h
…
tcp.h
bpf: sockmap, add sock close() hook to remove socks
2018-02-06 11:39:32 +01:00
timewait_sock.h
…
tipc.h
tipc: improve link resiliency when rps is activated
2017-11-11 15:36:05 +09:00
tls.h
tls: Add support for encryption using async offload accelerator
2018-01-31 10:26:30 -05:00
transp_v6.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tso.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tun_proto.h
vxlan: factor out VXLAN-GPE next protocol
2017-08-29 15:16:52 -07:00
udp_tunnel.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
udp.h
net: annotate ->poll() instances
2017-11-27 16:20:04 -05:00
udplite.h
udplite: fix partial checksum initialization
2018-02-16 15:57:42 -05:00
vsock_addr.h
…
vxlan.h
vxlan: Fix trailing semicolon
2018-01-17 16:07:24 -05:00
wext.h
lift handling of SIOCIW... out of dev_ioctl()
2018-01-24 19:13:45 -05:00
wimax.h
…
x25.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
x25device.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
xdp.h
xdp/qede: setup xdp_rxq_info and intro xdp_rxq_info_is_reg
2018-01-05 15:21:21 -08:00
xfrm.h
xfrm: Add ESN support for IPSec HW offload
2018-01-18 10:42:59 +01:00