From: acst1223 <natnstart@gmail.com>
Date: Thu, 26 Sep 2024 07:56:28 +0000 (+0900)
Subject: Include frame header in buffer length (#371)
X-Git-Tag: v10.1.0~8
X-Git-Url: http://git.ipfire.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=005111278ce60fa290638769d876ec2e6e03e033;p=thirdparty%2Fdhcpcd.git

Include frame header in buffer length (#371)

Since we are capturing packets at L2 we should not be using ETH_DATA_LEN
but ETH_FRAME_LEN to include also dst/src MAC and EtherType.

Co-authored-by: Andrzej Ostruszka <amo@semihalf.com>
---

diff --git a/src/if-linux.c b/src/if-linux.c
index b9075952..682f935f 100644
--- a/src/if-linux.c
+++ b/src/if-linux.c
@@ -1768,7 +1768,7 @@ bpf_open(const struct interface *ifp,
 	bpf->bpf_ifp = ifp;
 
 	/* Allocate a suitably large buffer for a single packet. */
-	bpf->bpf_size = ETH_DATA_LEN;
+	bpf->bpf_size = ETH_FRAME_LEN;
 	bpf->bpf_buffer = malloc(bpf->bpf_size);
 	if (bpf->bpf_buffer == NULL)
 		goto eexit;