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Florian Westphal 7ea851d19b tcp: merge 'init_req' and 'route_req' functions
The Multipath-TCP standard (RFC 8684) says that an MPTCP host should send
a TCP reset if the token in a MP_JOIN request is unknown.

At this time we don't do this, the 3whs completes and the 'new subflow'
is reset afterwards.  There are two ways to allow MPTCP to send the
reset.

1. override 'send_synack' callback and emit the rst from there.
   The drawback is that the request socket gets inserted into the
   listeners queue just to get removed again right away.

2. Send the reset from the 'route_req' function instead.
   This avoids the 'add&remove request socket', but route_req lacks the
   skb that is required to send the TCP reset.

Instead of just adding the skb to that function for MPTCP sake alone,
Paolo suggested to merge init_req and route_req functions.

This saves one indirection from syn processing path and provides the skb
to the merged function at the same time.

'send reset on unknown mptcp join token' is added in next patch.

Suggested-by: Paolo Abeni <pabeni@redhat.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-03 12:56:03 -08:00
..
6lowpan treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
9p net: 9p: Fix kerneldoc warnings of missing parameters etc 2020-11-02 12:25:52 -08:00
802
8021q net: vlan: Fixed signedness in vlan_group_prealloc_vid() 2020-09-28 00:51:39 -07:00
appletalk net: appletalk: fix kerneldoc warnings 2020-10-30 11:48:17 -07:00
atm atm: nicstar: Replace in_interrupt() usage 2020-11-18 16:43:55 -08:00
ax25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-07-25 17:49:04 -07:00
batman-adv batman-adv: set .owner to THIS_MODULE 2020-11-15 11:43:56 +01:00
bluetooth Bluetooth: Replace zero-length array with flexible-array member 2020-10-29 17:22:59 -05:00
bpf bpf: fix raw_tp test run in preempt kernel 2020-09-30 08:34:08 -07:00
bpfilter Revert "bpfilter: Fix build error with CONFIG_BPFILTER_UMH" 2020-10-15 12:33:24 -07:00
bridge bridge: switchdev: Notify about VLAN protocol changes 2020-12-01 15:21:13 -08:00
caif caif: Remove duplicate macro SRVL_CTRL_PKT_SIZE 2020-09-05 15:57:05 -07:00
can Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-11-27 18:25:27 -08:00
ceph libceph: clear con->out_msg on Policy::stateful_server faults 2020-10-12 15:29:27 +02:00
core net: delete __dev_getfirstbyhwtype 2020-12-01 15:40:01 -08:00
dcb net: dcb: Fix kerneldoc warnings 2020-10-30 11:59:54 -07:00
dccp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-11-27 18:25:27 -08:00
decnet treewide: rename nla_strlcpy to nla_strscpy. 2020-11-16 08:08:54 -08:00
dns_resolver docs: networking: convert dns_resolver.txt to ReST 2020-04-28 14:39:46 -07:00
dsa net: dsa: tag_hellcreek: Cleanup includes 2020-11-23 16:57:21 -08:00
ethernet net: datagram: fix some kernel-doc markups 2020-11-17 14:15:03 -08:00
ethtool Merge https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-11-12 16:54:48 -08:00
hsr genetlink: move to smaller ops wherever possible 2020-10-02 19:11:11 -07:00
ieee802154 treewide: rename nla_strlcpy to nla_strscpy. 2020-11-16 08:08:54 -08:00
ife
ipv4 tcp: merge 'init_req' and 'route_req' functions 2020-12-03 12:56:03 -08:00
ipv6 tcp: merge 'init_req' and 'route_req' functions 2020-12-03 12:56:03 -08:00
iucv net/af_iucv: set correct sk_protocol for child sockets 2020-11-21 14:43:45 -08:00
kcm net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
key Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
l2tp genetlink: move to smaller ops wherever possible 2020-10-02 19:11:11 -07:00
l3mdev net: l3mdev: Fix kerneldoc warning 2020-10-30 11:43:42 -07:00
lapb net/lapb: fix t1 timer handling for LAPB_STATE_0 2020-11-27 17:22:51 -08:00
llc net: llc: Fix kerneldoc warnings 2020-10-30 11:34:09 -07:00
mac80211 Merge https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-11-19 19:08:46 -08:00
mac802154 net: mac802154: convert tasklets to use new tasklet_setup() API 2020-11-07 10:40:56 -08:00
mpls mpls: drop skb's dst in mpls_forward() 2020-11-03 12:55:53 -08:00
mptcp tcp: merge 'init_req' and 'route_req' functions 2020-12-03 12:56:03 -08:00
ncsi net/ncsi: Fix netlink registration 2020-11-12 17:00:13 -08:00
netfilter net: openvswitch: Be liberal in tcp conntrack. 2020-11-20 09:53:48 -08:00
netlabel Merge https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-11-19 19:08:46 -08:00
netlink netlink: export policy in extended ACK 2020-10-09 20:22:32 -07:00
netrom treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nfc treewide: rename nla_strlcpy to nla_strscpy. 2020-11-16 08:08:54 -08:00
nsh treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-11-27 18:25:27 -08:00
packet Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-11-27 18:25:27 -08:00
phonet treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
psample genetlink: move to smaller ops wherever possible 2020-10-02 19:11:11 -07:00
qrtr net: qrtr: Release distant nodes along the bridge node 2020-11-11 15:29:34 -08:00
rds RDMA: Add rdma_connect_locked() 2020-10-28 09:14:49 -03:00
rfkill rfkill: Fix use-after-free in rfkill_resume() 2020-11-12 09:18:06 +01:00
rose rose: Fix Null pointer dereference in rose_send_frame() 2020-11-20 10:04:58 -08:00
rxrpc rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
sched net: sched: remove redundant 'rtnl_held' argument 2020-12-01 11:24:56 -08:00
sctp sctp: Fix some typo 2020-11-23 17:44:11 -08:00
smc net/smc: Add support for obtaining SMCR device list 2020-12-01 17:56:13 -08:00
strparser
sunrpc net: datagram: fix some kernel-doc markups 2020-11-17 14:15:03 -08:00
switchdev net: switchdev: Fixed kerneldoc warning 2020-09-23 17:46:31 -07:00
tipc net/tipc: fix all function Return: notation 2020-12-01 15:38:17 -08:00
tls net/tls: make sure tls offload sets salt_size 2020-12-01 17:51:30 -08:00
unix networking changes for the 5.10 merge window 2020-10-15 18:42:13 -07:00
vmw_vsock Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-11-27 18:25:27 -08:00
wireless Some updates: 2020-11-13 12:03:22 -08:00
x25 net/x25: remove x25_kill_by_device() 2020-11-27 17:22:51 -08:00
xdp xsk: Fix possible memory leak at socket close 2020-10-29 15:19:56 +01:00
xfrm net: xfrm: use core API for updating/providing stats 2020-11-14 17:01:08 -08:00
Kconfig wimax: move out to staging 2020-10-29 19:27:45 +01:00
Makefile wimax: move out to staging 2020-10-29 19:27:45 +01:00
compat.c iov_iter: transparently handle compat iovecs in import_iovec 2020-10-03 00:02:13 -04:00
devres.c net: devres: rename the release callback of devm_register_netdev() 2020-06-30 15:57:34 -07:00
socket.c net: don't include ethtool.h from netdevice.h 2020-11-23 17:27:04 -08:00
sysctl_net.c