From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lawrence Brakmo Subject: [PATCH net-next 2/6] bpf: Fix tcp_rwnd_kern.c sample program Date: Fri, 10 Nov 2017 12:42:59 -0800 Message-ID: <20171110204303.1840413-3-brakmo@fb.com> References: <20171110204303.1840413-1-brakmo@fb.com> Mime-Version: 1.0 Content-Type: text/plain Cc: Alexei Starovoitov , Daniel Borkmann To: netdev Return-path: Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:56220 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753852AbdKJUnV (ORCPT ); Fri, 10 Nov 2017 15:43:21 -0500 Received: from pps.filterd (m0109334.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id vAAKhD8N002704 for ; Fri, 10 Nov 2017 12:43:21 -0800 Received: from mail.thefacebook.com ([199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2e5g83gs1t-2 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Fri, 10 Nov 2017 12:43:13 -0800 In-Reply-To: <20171110204303.1840413-1-brakmo@fb.com> Sender: netdev-owner@vger.kernel.org List-ID: The program was returning -1 in some cases which is not allowed by the verifier any longer. Fixes: c400296bf63d ("bpf: Sample bpf program to set initial window") Signed-off-by: Lawrence Brakmo --- samples/bpf/tcp_rwnd_kern.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/samples/bpf/tcp_rwnd_kern.c b/samples/bpf/tcp_rwnd_kern.c index 3f2a228..09ff65b 100644 --- a/samples/bpf/tcp_rwnd_kern.c +++ b/samples/bpf/tcp_rwnd_kern.c @@ -38,8 +38,10 @@ int bpf_rwnd(struct bpf_sock_ops *skops) * if neither port numberis 55601 */ if (bpf_ntohl(skops->remote_port) != - 55601 && skops->local_port != 55601) - return -1; + 55601 && skops->local_port != 55601) { + skops->reply = -1; + return 1; + } op = (int) skops->op; -- 2.9.5