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Martin KaFai Lau 1fe4850b34 bpf: bpf_fib_lookup should not return neigh in NUD_FAILED state 
The bpf_fib_lookup() helper does not only look up the fib (ie. route)
but it also looks up the neigh. Before returning the neigh, the helper
does not check for NUD_VALID. When a neigh state (neigh->nud_state)
is in NUD_FAILED, its dmac (neigh->ha) could be all zeros. The helper
still returns SUCCESS instead of NO_NEIGH in this case. Because of the
SUCCESS return value, the bpf prog directly uses the returned dmac
and ends up filling all zero in the eth header.

This patch checks for NUD_VALID and returns NO_NEIGH if the neigh is
not valid.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230217004150.2980689-3-martin.lau@linux.dev
2023-02-17 16:19:42 +01:00
..
bpf_sk_storage.c bpf: Fix a compilation failure with clang lto build 2022-11-30 17:13:25 -08:00
datagram.c tcp: TX zerocopy should not sense pfmemalloc status 2022-09-02 12:29:02 +01:00
dev.c bpf-next-for-netdev 2023-02-10 17:51:27 -08:00
dev.h net-sysctl: factor-out rpm mask manipulation helpers 2023-02-09 17:45:55 -08:00
dev_addr_lists.c net: extract a few internals from netdevice.h 2022-04-07 20:32:09 -07:00
dev_addr_lists_test.c kunit: Use KUNIT_EXPECT_MEMEQ macro 2022-10-27 02:40:14 -06:00
dev_ioctl.c net: dev: Convert sa_data to flexible array in struct sockaddr 2022-10-25 11:44:20 -07:00
drop_monitor.c genetlink: introduce split op representation 2022-11-07 12:30:16 +00:00
dst.c ipv6: remove max_size check inline with ipv4 2023-01-13 20:59:14 -08:00
dst_cache.c wireguard: device: reset peer src endpoint when netns exits 2021-11-29 19:50:45 -08:00
failover.c net: failover: use IFF_NO_ADDRCONF flag to prevent ipv6 addrconf 2022-12-12 15:18:25 -08:00
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 fib: expand fib_rule_policy 2021-12-16 07:18:35 -08:00
filter.c bpf: bpf_fib_lookup should not return neigh in NUD_FAILED state 2023-02-17 16:19:42 +01:00
flow_dissector.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-11-29 13:04:52 -08:00
flow_offload.c net: flow_offload: add support for ARP frame matching 2022-11-14 11:24:16 +00:00
gen_estimator.c treewide: Convert del_timer*() to timer_shutdown*() 2022-12-25 13:38:09 -08:00
gen_stats.c net: Remove the obsolte u64_stats_fetch_*_irq() users (net). 2022-10-28 20:13:54 -07:00
gro.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-02-02 14:49:55 -08:00
gro_cells.c net: drop the weight argument from netif_napi_add 2022-09-28 18:57:14 -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: linkwatch: only report IF_OPER_LOWERLAYERDOWN if iflink is actually down 2022-11-16 09:45:00 +00:00
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 xfrm: lwtunnel: squelch kernel warning in case XFRM encap type is not available 2022-10-12 10:45:51 +02:00
Makefile netdev-genl: create a simple family for netdev stuff 2023-02-02 20:48:23 -08:00
neighbour.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-02-09 12:25:40 -08:00
net-procfs.c net: extract a few internals from netdevice.h 2022-04-07 20:32:09 -07:00
net-sysfs.c net: introduce default_rps_mask netns attribute 2023-02-09 17:45:55 -08:00
net-sysfs.h net-sysfs: add netdev_change_owner() 2020-02-26 20:07:25 -08:00
net-traces.c net: bridge: Add a tracepoint for MDB overflows 2023-02-06 08:48:25 +00:00
net_namespace.c net: fix UaF in netns ops registration error path 2023-01-20 18:51:18 -08:00
netclassid_cgroup.c core: Variable type completion 2022-08-31 09:40:34 +01:00
netdev-genl-gen.c netdev-genl: create a simple family for netdev stuff 2023-02-02 20:48:23 -08:00
netdev-genl-gen.h netdev-genl: create a simple family for netdev stuff 2023-02-02 20:48:23 -08:00
netdev-genl.c netdev-genl: create a simple family for netdev stuff 2023-02-02 20:48:23 -08:00
netevent.c net: core: Correct function name netevent_unregister_notifier() in the kerneldoc 2021-03-28 17:56:56 -07:00
netpoll.c netpoll: Remove 4s sleep during carrier detection 2023-01-27 23:24:07 -08:00
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 of: net: export of_get_mac_address_nvmem() 2022-11-29 10:45:53 +01:00
page_pool.c net: page_pool: use in_softirq() instead 2023-02-06 09:15:22 +00:00
pktgen.c treewide: use get_random_u32_inclusive() when possible 2022-11-18 02:18:02 +01:00
ptp_classifier.c ptp: Add generic PTP is_sync() function 2022-03-07 11:31:34 +00:00
request_sock.c tcp: add rcu protection around tp->fastopen_rsk 2019-10-13 10:13:08 -07:00
rtnetlink.c net: bridge: Add netlink knobs for number / maximum MDB entries 2023-02-06 08:48:26 +00:00
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 net: skbuff: drop the word head from skb cache 2023-02-10 09:10:28 +00:00
skmsg.c net/sock: Introduce trace_sk_data_ready() 2023-01-23 11:26:50 +00:00
sock.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-02-09 12:25:40 -08:00
sock_destructor.h skb_expand_head() adjust skb->truesize incorrectly 2021-10-22 12:35:51 -07:00
sock_diag.c net: fix __sock_gen_cookie() 2022-11-21 20:36:30 -08:00
sock_map.c bpf, sockmap: Don't let sock_map_{close,destroy,unhash} call itself 2023-01-24 21:32:55 -08:00
sock_reuseport.c soreuseport: Fix socket selection for SO_INCOMING_CPU. 2022-10-25 11:35:16 +02:00
stream.c net: stream: purge sk_error_queue in sk_stream_kill_queues() 2022-12-19 12:33:16 +00:00
sysctl_net_core.c net: introduce default_rps_mask netns attribute 2023-02-09 17:45:55 -08:00
timestamping.c net: Introduce a new MII time stamping interface. 2019-12-25 19:51:33 -08:00
tso.c net: tso: inline tso_count_descs() 2022-12-12 15:04:39 -08:00
utils.c net: core: inet[46]_pton strlen len types 2022-11-01 21:14:39 -07:00
xdp.c bpf-next-for-netdev 2023-02-10 17:51:27 -08:00