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authorLawrence Brakmo <brakmo@fb.com>2017-11-11 09:19:54 +0300
committerDavid S. Miller <davem@davemloft.net>2017-11-11 09:52:41 +0300
commite1853319fc4c7279a3561b1844af4a02487c93ef (patch)
tree2a2a98fe29e2ea0d69178e3c92622ff3a67ffe57
parent2ff969fbe2bfa4486b66226917352d4bb12ec1cb (diff)
downloadlinux-e1853319fc4c7279a3561b1844af4a02487c93ef.tar.xz
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 <brakmo@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--samples/bpf/tcp_iw_kern.c14
1 files 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;