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authorLawrence Brakmo <brakmo@fb.com>2017-11-11 09:19:55 +0300
committerDavid S. Miller <davem@davemloft.net>2017-11-11 09:52:41 +0300
commit03e982eed419da37e9cac1d759097dbe10447190 (patch)
tree8e5123160a50193d2b2c5c65fcd7178359353018 /samples/bpf/tcp_clamp_kern.c
parente1853319fc4c7279a3561b1844af4a02487c93ef (diff)
downloadlinux-03e982eed419da37e9cac1d759097dbe10447190.tar.xz
bpf: Fix tcp_clamp_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>
Diffstat (limited to 'samples/bpf/tcp_clamp_kern.c')
-rw-r--r--samples/bpf/tcp_clamp_kern.c24
1 files changed, 13 insertions, 11 deletions
diff --git a/samples/bpf/tcp_clamp_kern.c b/samples/bpf/tcp_clamp_kern.c
index d68eadd9ca2d..f4225c9d2c0c 100644
--- a/samples/bpf/tcp_clamp_kern.c
+++ b/samples/bpf/tcp_clamp_kern.c
@@ -41,8 +41,10 @@ int bpf_clamp(struct bpf_sock_ops *skops)
/* For testing purposes, only execute rest of BPF program
* if neither port numberis 55601
*/
- if (bpf_ntohl(skops->remote_port) != 55601 && skops->local_port != 55601)
- return -1;
+ if (bpf_ntohl(skops->remote_port) != 55601 && skops->local_port != 55601) {
+ skops->reply = -1;
+ return 0;
+ }
op = (int) skops->op;
@@ -66,9 +68,9 @@ int bpf_clamp(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,
@@ -80,12 +82,12 @@ int bpf_clamp(struct bpf_sock_ops *skops)
rv = bpf_setsockopt(skops, SOL_TCP,
TCP_BPF_SNDCWND_CLAMP,
&clamp, sizeof(clamp));
- rv = rv*100 + 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_SNDBUF, &bufsize,
+ sizeof(bufsize));
+ rv += bpf_setsockopt(skops, SOL_SOCKET,
+ SO_RCVBUF, &bufsize,
+ sizeof(bufsize));
break;
default:
rv = -1;