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John Fastabend 18ebe16d10 bpf, sockmap: Add skb_adjust_room to pop bytes off ingress payload 
This implements a new helper skb_adjust_room() so users can push/pop
extra bytes from a BPF_SK_SKB_STREAM_VERDICT program.

Some protocols may include headers and other information that we may
not want to include when doing a redirect from a BPF_SK_SKB_STREAM_VERDICT
program. One use case is to redirect TLS packets into a receive socket
that doesn't expect TLS data. In TLS case the first 13B or so contain the
protocol header. With KTLS the payload is decrypted so we should be able
to redirect this to a receiving socket, but the receiving socket may not
be expecting to receive a TLS header and discard the data. Using the
above helper we can pop the header off and put an appropriate header on
the payload. This allows for creating a proxy between protocols without
extra hops through the stack or userspace.

So in order to fix this case add skb_adjust_room() so users can strip the
header. After this the user can strip the header and an unmodified receiver
thread will work correctly when data is redirected into the ingress path
of a sock.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/160160099197.7052.8443193973242831692.stgit@john-Precision-5820-Tower
2020-10-02 15:18:39 -07:00
..
6lowpan
9p treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
802
8021q net: vlan: Fixed signedness in vlan_group_prealloc_vid() 2020-09-28 00:51:39 -07:00
appletalk appletalk: Fix atalk_proc_init() return path 2020-08-03 15:48:32 -07:00
atm net: atm: delete duplicated words 2020-09-18 14:12:43 -07:00
ax25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-07-25 17:49:04 -07:00
batman-adv net: bridge: mcast: rename br_ip's u member to dst 2020-09-23 13:24:34 -07:00
bluetooth Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next 2020-09-29 13:22:53 -07:00
bpf bpf: fix raw_tp test run in preempt kernel 2020-09-30 08:34:08 -07:00
bpfilter bpf: Add kernel module with user mode driver that populates bpffs. 2020-08-20 16:02:36 +02:00
bridge net: bridge: mcast: remove only S,G port groups from sg_port hash 2020-09-25 16:50:19 -07:00
caif caif: Remove duplicate macro SRVL_CTRL_PKT_SIZE 2020-09-05 15:57:05 -07:00
can can: remove "WITH Linux-syscall-note" from SPDX tag of C files 2020-09-21 10:13:16 +02:00
ceph treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
core bpf, sockmap: Add skb_adjust_room to pop bytes off ingress payload 2020-10-02 15:18:39 -07:00
dcb net: DCB: Validate DCB_ATTR_DCB_BUFFER argument 2020-09-10 15:09:08 -07:00
dccp inet: remove icsk_ack.blocked 2020-09-30 14:21:30 -07:00
decnet treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
dns_resolver
dsa net: dsa: tag_rtl4_a: use the generic flow dissector procedure 2020-09-26 14:17:59 -07:00
ethernet
ethtool Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-22 16:45:34 -07:00
hsr Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-22 16:45:34 -07:00
ieee802154 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ife
ipv4 bpf: tcp: Do not limit cb_flags when creating child sk from listen sk 2020-10-02 11:34:48 -07:00
ipv6 ip6gre: avoid tx_error when sending MLD/DAD on external tunnels 2020-09-28 16:01:37 -07:00
iucv treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
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 l2tp: report rx cookie discards in netlink get 2020-09-29 13:26:36 -07:00
l3mdev net: Fix some comments 2020-08-27 07:55:59 -07:00
lapb
llc net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-22 16:45:34 -07:00
mac802154 Merge tag 'ieee802154-for-davem-2020-09-08' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan 2020-09-08 20:12:58 -07:00
mpls treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mptcp net: tcp: drop unused function argument from mptcp_incoming_options 2020-09-24 20:17:01 -07:00
ncsi treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-22 16:45:34 -07:00
netlabel netlabel: Fix some kernel-doc warnings 2020-09-08 20:04:27 -07:00
netlink netlink: add spaces around '&' in netlink_recv/sendmsg() 2020-09-17 16:53:47 -07:00
netrom treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nfc NFC: digital: Remove two unused macroes 2020-09-05 16:01:52 -07:00
nsh
openvswitch net: openswitch: reuse the helper variable to improve the code readablity 2020-09-18 14:24:08 -07:00
packet net/packet: Fix a comment about network_header 2020-09-19 16:40:48 -07:00
phonet treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
psample
qrtr net: qrtr: check skb_put_padto() return value 2020-09-09 11:04:39 -07:00
rds RDS: drop double zeroing 2020-09-20 19:09:11 -07:00
rfkill
rose treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
rxrpc rxrpc: Fix an overget of the conn bundle when setting up a client conn 2020-09-14 16:18:59 +01:00
sched net/sched: cls_u32: Replace one-element array with flexible-array member 2020-09-28 18:48:42 -07:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-22 16:45:34 -07:00
smc net/smc: CLC decline - V2 enhancements 2020-09-28 15:19:03 -07:00
strparser
sunrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-22 16:45:34 -07:00
switchdev net: switchdev: kerneldoc fixes 2020-07-13 17:20:40 -07:00
tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-22 16:45:34 -07:00
tls net/tls: Implement getsockopt SOL_TLS TLS_RX 2020-09-01 11:47:12 -07:00
unix net: unix: remove redundant assignment to variable 'err' 2020-09-21 14:51:37 -07:00
vmw_vsock vsock: fix potential null pointer dereference in vsock_poll() 2020-08-12 12:56:06 -07:00
wimax
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-22 16:45:34 -07:00
x25 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
xdp xsk: Fix a documentation mistake in xsk_queue.h 2020-09-29 11:25:56 -07:00
xfrm treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
compat.c net/scm: Fix typo in SCM_RIGHTS compat refactoring 2020-08-07 12:43:25 -07:00
devres.c
Kconfig drop_monitor: Convert to using devlink tracepoint 2020-09-30 18:01:26 -07:00
Makefile
socket.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-04 21:28:59 -07:00
sysctl_net.c