linux/net/core
Daniel Borkmann 7cdec54f97 bpf: Add csum_level helper for fixing up csum levels
Add a bpf_csum_level() helper which BPF programs can use in combination
with bpf_skb_adjust_room() when they pass in BPF_F_ADJ_ROOM_NO_CSUM_RESET
flag to the latter to avoid falling back to CHECKSUM_NONE.

The bpf_csum_level() allows to adjust CHECKSUM_UNNECESSARY skb->csum_levels
via BPF_CSUM_LEVEL_{INC,DEC} which calls __skb_{incr,decr}_checksum_unnecessary()
on the skb. The helper also allows a BPF_CSUM_LEVEL_RESET which sets the skb's
csum to CHECKSUM_NONE as well as a BPF_CSUM_LEVEL_QUERY to just return the
current level. Without this helper, there is no way to otherwise adjust the
skb->csum_level. I did not add an extra dummy flags as there is plenty of free
bitspace in level argument itself iff ever needed in future.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Acked-by: Lorenz Bauer <lmb@cloudflare.com>
Link: https://lore.kernel.org/bpf/279ae3717cb3d03c0ffeb511493c93c450a01e1a.1591108731.git.daniel@iogearbox.net
2020-06-02 11:50:23 -07:00
..
Makefile ethtool: move to its own directory 2019-12-12 17:07:05 -08:00
bpf_sk_storage.c bpf: Implement CAP_BPF 2020-05-15 17:29:41 +02:00
datagram.c net: use indirect call wrappers for skb_copy_datagram_iter() 2020-03-25 11:30:40 -07:00
datagram.h net/core: Allow the compiler to verify declaration and definition consistency 2019-03-27 13:49:44 -07:00
dev.c bpf: Add support to attach bpf program to a devmap entry 2020-06-01 14:48:32 -07:00
dev_addr_lists.c net: remove unnecessary variables and callback 2019-10-24 14:53:49 -07:00
dev_ioctl.c ethtool: add timestamping related string sets 2020-03-29 22:32:36 -07:00
devlink.c devlink: Add ACL control packet traps 2020-06-01 11:49:23 -07:00
drop_monitor.c drop_monitor: work around gcc-10 stringop-overflow warning 2020-05-01 15:45:16 -07:00
dst.c net/dst: use a smaller percpu_counter batch for dst entries accounting 2020-05-08 21:33:33 -07:00
dst_cache.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
failover.c failover: allow name change on IFF_UP slave interfaces 2019-04-10 22:12:26 -07:00
fib_notifier.c net: fib_notifier: propagate extack down to the notifier block callback 2019-10-04 11:10:56 -07:00
fib_rules.c net: fib_rules: Correctly set table field when table number exceeds 8 bits 2020-02-16 18:38:24 -08:00
filter.c bpf: Add csum_level helper for fixing up csum levels 2020-06-02 11:50:23 -07:00
flow_dissector.c flow_dissector: Move out netns_bpf prog callbacks 2020-06-01 15:21:02 -07:00
flow_offload.c net: remove indirect block netdev event registration 2020-06-01 11:41:50 -07:00
gen_estimator.c net_sched: gen_estimator: extend packet counter to 64bit 2019-11-06 21:51:36 -08:00
gen_stats.c docs: networking: convert gen_stats.txt to ReST 2020-04-28 14:39:46 -07:00
gro_cells.c gro_cells: make sure device is up in gro_cells_receive() 2019-03-10 11:07:14 -07:00
hwbm.c net: hwbm: Make the hwbm_pool lock a mutex 2019-06-09 19:40:10 -07:00
link_watch.c net: Add IF_OPER_TESTING 2020-04-20 12:43:24 -07:00
lwt_bpf.c net: add net available in build_state 2020-03-29 22:30:57 -07:00
lwtunnel.c net: ipv6: add rpl sr tunnel 2020-03-29 22:30:57 -07:00
neighbour.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-31 17:48:46 -07:00
net-procfs.c net: procfs: use index hashlist instead of name hashlist 2019-10-01 14:47:19 -07:00
net-sysfs.c net: core: recursively find netdev by device node 2020-05-15 10:18:49 -07:00
net-sysfs.h net-sysfs: add netdev_change_owner() 2020-02-26 20:07:25 -08:00
net-traces.c page_pool: add tracepoints for page_pool with details need by XDP 2019-06-19 11:23:13 -04:00
net_namespace.c bpf: Add netns cookie and enable it for bpf cgroup hooks 2020-03-27 19:40:38 -07:00
netclassid_cgroup.c cgroup, netclassid: remove double cond_resched 2020-04-21 15:44:30 -07:00
netevent.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
netpoll.c netpoll: accept NULL np argument in netpoll_send_skb() 2020-05-07 18:11:07 -07:00
netprio_cgroup.c netprio_cgroup: Fix unlimited memory leak of v2 cgroups 2020-05-09 20:59:21 -07:00
page_pool.c net: page pool: allow to pass zero flags to page_pool_init() 2020-03-29 21:49:20 -07:00
pktgen.c docs: networking: convert pktgen.txt to ReST 2020-04-30 12:56:37 -07:00
ptp_classifier.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295 2019-06-05 17:36:38 +02:00
request_sock.c tcp: add rcu protection around tp->fastopen_rsk 2019-10-13 10:13:08 -07:00
rtnetlink.c net: rtnetlink: remove redundant assignment to variable err 2020-04-27 11:14:07 -07:00
scm.c net: ignore sock_from_file errors in __scm_install_fd 2020-05-13 12:30:54 -07:00
secure_seq.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
skbuff.c net: unexport skb_gro_receive() 2020-05-19 19:55:36 -07:00
skmsg.c bpf: Fix running sk_skb program types with ktls 2020-06-01 14:48:32 -07:00
sock.c net: Make locking in sock_bindtoindex optional 2020-06-01 14:57:14 -07:00
sock_diag.c sock: make cookie generation global instead of per netns 2019-08-09 13:14:46 -07:00
sock_map.c bpf: Allow bpf_map_lookup_elem for SOCKMAP and SOCKHASH 2020-04-29 23:30:59 +02:00
sock_reuseport.c net: Generate reuseport group ID on group creation 2020-02-21 22:29:45 +01:00
stream.c tcp: make sure EPOLLOUT wont be missed 2019-08-19 13:07:43 -07:00
sysctl_net_core.c netns: enable to inherit devconf from current netns 2020-05-16 13:46:37 -07:00
timestamping.c net: Introduce a new MII time stamping interface. 2019-12-25 19:51:33 -08:00
tso.c net: Use skb accessors in network core 2019-07-22 20:47:56 -07:00
utils.c net: Fix skb->csum update in inet_proto_csum_replace16(). 2020-01-24 20:54:30 +01:00
xdp.c xdp: Simplify xdp_return_{frame, frame_rx_napi, buff} 2020-05-21 17:31:27 -07:00