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273b7f0fb4
linux/net/core
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Martin KaFai Lau 273b7f0fb4 bpf: Change bpf_getsockopt(SOL_TCP) to reuse do_tcp_getsockopt() 
This patch changes bpf_getsockopt(SOL_TCP) to reuse
do_tcp_getsockopt().  It removes the duplicated code from
bpf_getsockopt(SOL_TCP).

Before this patch, there were some optnames available to
bpf_setsockopt(SOL_TCP) but missing in bpf_getsockopt(SOL_TCP).
For example, TCP_NODELAY, TCP_MAXSEG, TCP_KEEPIDLE, TCP_KEEPINTVL,
and a few more.  It surprises users from time to time.  This patch
automatically closes this gap without duplicating more code.

bpf_getsockopt(TCP_SAVED_SYN) does not free the saved_syn,
so it stays in sol_tcp_sockopt().

For string name value like TCP_CONGESTION, bpf expects it
is always null terminated, so sol_tcp_sockopt() decrements
optlen by one before calling do_tcp_getsockopt() and
the 'if (optlen < saved_optlen) memset(..,0,..);'
in __bpf_getsockopt() will always do a null termination.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20220902002918.2894511-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2022-09-02 20:34:32 -07:00
..
.gitignore net: skb: use auto-generation to convert skb drop reason to string 2022-06-07 12:51:41 +02:00
bpf_sk_storage.c bpf: Check the validity of max_rdwr_access for sock local storage map iterator 2022-08-10 10:12:48 -07:00
datagram.c iov_iter: advancing variants of iov_iter_get_pages{,_alloc}() 2022-08-08 22:37:22 -04:00
dev_addr_lists_test.c net: kunit: add a test for dev_addr_lists 2021-11-20 12:25:57 +00:00
dev_addr_lists.c net: extract a few internals from netdevice.h 2022-04-07 20:32:09 -07:00
dev_ioctl.c net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
dev.c Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-07-22 16:55:44 -07:00
dev.h net: add skb_defer_max sysctl 2022-05-16 11:33:59 +01:00
devlink.c devlink: Fix use-after-free after a failed reload 2022-08-10 13:48:04 +01:00
drop_monitor.c drop_monitor: adopt u64_stats_t 2022-06-09 21:53:12 -07:00
dst_cache.c wireguard: device: reset peer src endpoint when netns exits 2021-11-29 19:50:45 -08:00
dst.c net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
failover.c net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
fib_notifier.c
fib_rules.c fib: expand fib_rule_policy 2021-12-16 07:18:35 -08:00
filter.c bpf: Change bpf_getsockopt(SOL_TCP) to reuse do_tcp_getsockopt() 2022-09-02 20:34:32 -07:00
flow_dissector.c bpf, flow_dissector: Introduce BPF_FLOW_DISSECTOR_CONTINUE retcode for bpf progs 2022-08-23 22:47:55 +02:00
flow_offload.c flow_offload: Introduce flow_match_pppoe 2022-07-26 10:49:27 -07:00
gen_estimator.c net: sched: Remove Qdisc::running sequence counter 2021-10-18 12:54:41 +01:00
gen_stats.c net: stats: Read the statistics in ___gnet_stats_copy_basic() instead of adding. 2021-10-21 12:47:56 +01:00
gro_cells.c net: add per-cpu storage and net->core_stats 2022-03-11 23:17:24 -08:00
gro.c net: allow gro_max_size to exceed 65536 2022-05-16 10:18:56 +01:00
hwbm.c
link_watch.c net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
lwt_bpf.c bpf, lwt: Fix crash when using bpf_skb_set_tunnel_key() from bpf_xmit lwt hook 2022-04-22 17:45:25 +02:00
lwtunnel.c lwtunnel: Validate RTA_ENCAP_TYPE attribute length 2021-12-31 14:31:59 +00:00
Makefile net: skb: use auto-generation to convert skb drop reason to string 2022-06-07 12:51:41 +02:00
neighbour.c net, neigh: introduce interval_probe_time_ms for periodic probe 2022-06-30 13:14:35 +02:00
net_namespace.c net: set proper memcg for net_init hooks allocations 2022-06-16 19:48:31 -07:00
net-procfs.c net: extract a few internals from netdevice.h 2022-04-07 20:32:09 -07:00
net-sysfs.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-06-23 12:33:24 -07:00
net-sysfs.h
net-traces.c
netclassid_cgroup.c bpf, cgroups: Fix cgroup v2 fallback on v1/v2 mixed mode 2021-09-13 16:35:58 -07:00
netevent.c
netpoll.c net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
netprio_cgroup.c bpf, cgroups: Fix cgroup v2 fallback on v1/v2 mixed mode 2021-09-13 16:35:58 -07:00
of_net.c Revert "of: net: support NVMEM cells with MAC in text format" 2022-01-12 14:14:36 +00:00
page_pool.c - The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe 2022-08-05 16:32:45 -07:00
pktgen.c net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
ptp_classifier.c ptp: Add generic PTP is_sync() function 2022-03-07 11:31:34 +00:00
request_sock.c
rtnetlink.c net: allow gro_max_size to exceed 65536 2022-05-16 10:18:56 +01:00
scm.c memcg: enable accounting for scm_fp_list objects 2021-07-20 06:00:38 -07:00
secure_seq.c tcp: Fix data-races around sysctl knobs related to SYN option. 2022-07-20 10:14:49 +01:00
selftests.c net: core: constify mac addrs in selftests 2021-10-24 13:59:44 +01:00
skbuff.c Merge branch 'io_uring-zerocopy-send' of git://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux 2022-07-19 14:22:41 -07:00
skmsg.c Including fixes from bluetooth, bpf, can and netfilter. 2022-08-11 13:45:37 -07:00
sock_destructor.h skb_expand_head() adjust skb->truesize incorrectly 2021-10-22 12:35:51 -07:00
sock_diag.c net: Don't include filter.h from net/sock.h 2021-12-29 08:48:14 -08:00
sock_map.c Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-08-17 20:29:36 -07:00
sock_reuseport.c tcp: Fix data-races around sysctl_tcp_migrate_req. 2022-07-18 12:21:54 +01:00
sock.c bpf: Change bpf_getsockopt(SOL_SOCKET) to reuse sk_getsockopt() 2022-09-02 20:34:31 -07:00
stream.c net: use WARN_ON_ONCE() in sk_stream_kill_queues() 2022-06-09 21:53:55 -07:00
sysctl_net_core.c Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-05-23 16:07:14 -07:00
timestamping.c
tso.c
utils.c net: core: Use csum_replace_by_diff() and csum_sub() instead of opencoding 2022-02-21 11:40:44 +00:00
xdp.c Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-03-22 11:18:49 -07:00