From: Roy Marples <roy@marples.name>
Date: Thu, 18 Apr 2019 17:05:56 +0000 (+0100)
Subject: BPF: Set BPF_MCAST flag as on BSD
X-Git-Tag: v8.0.0~46^2~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=06f90a0ea67867b14a2c3740c69ad1fa19cd54c3;p=thirdparty%2Fdhcpcd.git

BPF: Set BPF_MCAST flag as on BSD
---

diff --git a/src/bpf.c b/src/bpf.c
index 81d3a1c6..940dfd80 100644
--- a/src/bpf.c
+++ b/src/bpf.c
@@ -95,7 +95,7 @@ bpf_frame_header_len(const struct interface *ifp)
 static const uint8_t etherbroadcastaddr[] =
     { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 
-static int
+int
 bpf_frame_bcast(const struct interface *ifp, const char *frame)
 {
 
diff --git a/src/bpf.h b/src/bpf.h
index f3ce5434..05c20941 100644
--- a/src/bpf.h
+++ b/src/bpf.h
@@ -37,6 +37,7 @@
 
 extern const char *bpf_name;
 size_t bpf_frame_header_len(const struct interface *);
+int bpf_frame_bcast(const struct interface *, const char *frame);
 int bpf_open(struct interface *, int (*)(struct interface *, int));
 int bpf_close(struct interface *, int);
 int bpf_attach(int, void *, unsigned int);
diff --git a/src/if-linux.c b/src/if-linux.c
index dd0fb58f..22913d54 100644
--- a/src/if-linux.c
+++ b/src/if-linux.c
@@ -1412,6 +1412,10 @@ bpf_read(struct interface *ifp, int s, void *data, size_t len,
 	if (bytes) {
 		ssize_t fl = (ssize_t)bpf_frame_header_len(ifp);
 
+		if (bpf_frame_bcast(ifp, state->buffer) == 0)
+			*flags |= BPF_BCAST;
+		else
+			*flags &= ~BPF_BCAST;
 		bytes -= fl;
 		if ((size_t)bytes > len)
 			bytes = (ssize_t)len;