From e1853319fc4c7279a3561b1844af4a02487c93ef Mon Sep 17 00:00:00 2001 From: Lawrence Brakmo Date: Fri, 10 Nov 2017 22:19:54 -0800 Subject: bpf: Fix tcp_iw_kern.c sample program The program was returning -1 in some cases which is not allowed by the verifier any longer. Fixes: 390ee7e29fc8 ("bpf: enforce return code for cgroup-bpf programs") Signed-off-by: Lawrence Brakmo Signed-off-by: David S. Miller --- samples/bpf/tcp_iw_kern.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/samples/bpf/tcp_iw_kern.c b/samples/bpf/tcp_iw_kern.c index 23c5122ef819..4ca5ecc9f580 100644 --- a/samples/bpf/tcp_iw_kern.c +++ b/samples/bpf/tcp_iw_kern.c @@ -42,8 +42,10 @@ int bpf_iw(struct bpf_sock_ops *skops) * if neither port numberis 55601 */ if (bpf_ntohl(skops->remote_port) != 55601 && - skops->local_port != 55601) - return -1; + skops->local_port != 55601) { + skops->reply = -1; + return 1; + } op = (int) skops->op; @@ -62,8 +64,8 @@ int bpf_iw(struct bpf_sock_ops *skops) /* Set sndbuf and rcvbuf of active connections */ rv = bpf_setsockopt(skops, SOL_SOCKET, SO_SNDBUF, &bufsize, sizeof(bufsize)); - rv = rv*100 + bpf_setsockopt(skops, SOL_SOCKET, SO_RCVBUF, - &bufsize, sizeof(bufsize)); + rv += bpf_setsockopt(skops, SOL_SOCKET, SO_RCVBUF, + &bufsize, sizeof(bufsize)); break; case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB: rv = bpf_setsockopt(skops, SOL_TCP, TCP_BPF_IW, &iw, @@ -73,8 +75,8 @@ int bpf_iw(struct bpf_sock_ops *skops) /* Set sndbuf and rcvbuf of passive connections */ rv = bpf_setsockopt(skops, SOL_SOCKET, SO_SNDBUF, &bufsize, sizeof(bufsize)); - rv = rv*100 + bpf_setsockopt(skops, SOL_SOCKET, SO_RCVBUF, - &bufsize, sizeof(bufsize)); + rv += bpf_setsockopt(skops, SOL_SOCKET, SO_RCVBUF, + &bufsize, sizeof(bufsize)); break; default: rv = -1; -- cgit v1.2.3