From 743df8b7749fb5a289fc0c7ac94ec15533596839 Mon Sep 17 00:00:00 2001 From: John Fastabend Date: Sat, 10 Oct 2020 22:09:07 -0700 Subject: [PATCH] bpf, sockmap: Check skb_verdict and skb_parser programs explicitly We are about to allow skb_verdict to run without skb_parser programs as a first step change code to check each program type specifically. This should be a mechanical change without any impact to actual result. Signed-off-by: John Fastabend Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/160239294756.8495.5796595770890272219.stgit@john-Precision-5820-Tower --- net/core/sock_map.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/net/core/sock_map.c b/net/core/sock_map.c index e83a80e8f13b..a2ed5b6223b9 100644 --- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -230,16 +230,16 @@ static int sock_map_link(struct bpf_map *map, struct sk_psock_progs *progs, { struct bpf_prog *msg_parser, *skb_parser, *skb_verdict; struct sk_psock *psock; - bool skb_progs; int ret; skb_verdict = READ_ONCE(progs->skb_verdict); skb_parser = READ_ONCE(progs->skb_parser); - skb_progs = skb_parser && skb_verdict; - if (skb_progs) { + if (skb_verdict) { skb_verdict = bpf_prog_inc_not_zero(skb_verdict); if (IS_ERR(skb_verdict)) return PTR_ERR(skb_verdict); + } + if (skb_parser) { skb_parser = bpf_prog_inc_not_zero(skb_parser); if (IS_ERR(skb_parser)) { bpf_prog_put(skb_verdict); @@ -264,7 +264,8 @@ static int sock_map_link(struct bpf_map *map, struct sk_psock_progs *progs, if (psock) { if ((msg_parser && READ_ONCE(psock->progs.msg_parser)) || - (skb_progs && READ_ONCE(psock->progs.skb_parser))) { + (skb_parser && READ_ONCE(psock->progs.skb_parser)) || + (skb_verdict && READ_ONCE(psock->progs.skb_verdict))) { sk_psock_put(sk, psock); ret = -EBUSY; goto out_progs; @@ -285,7 +286,7 @@ static int sock_map_link(struct bpf_map *map, struct sk_psock_progs *progs, goto out_drop; write_lock_bh(&sk->sk_callback_lock); - if (skb_progs && !psock->parser.enabled) { + if (skb_parser && skb_verdict && !psock->parser.enabled) { ret = sk_psock_init_strp(sk, psock); if (ret) { write_unlock_bh(&sk->sk_callback_lock); @@ -303,10 +304,10 @@ out_progs: if (msg_parser) bpf_prog_put(msg_parser); out: - if (skb_progs) { + if (skb_verdict) bpf_prog_put(skb_verdict); + if (skb_parser) bpf_prog_put(skb_parser); - } return ret; } -- 2.39.5