From: Roy Marples <roy@marples.name>
Date: Fri, 16 Jan 2015 23:11:39 +0000 (+0000)
Subject: If we cannot open the kernel Packet Filter, give a better error message
X-Git-Tag: v6.7.0~17
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=31f26dd9b38412a332c0e2c1824e2531b2c8b35e;p=thirdparty%2Fdhcpcd.git

If we cannot open the kernel Packet Filter, give a better error message
and disable IPv4 configuration.
---

diff --git a/dhcp.c b/dhcp.c
index 31d018ff..8fdbc357 100644
--- a/dhcp.c
+++ b/dhcp.c
@@ -2876,7 +2876,15 @@ dhcp_open(struct interface *ifp)
 	if (state->raw_fd == -1) {
 		state->raw_fd = if_openrawsocket(ifp, ETHERTYPE_IP);
 		if (state->raw_fd == -1) {
-			syslog(LOG_ERR, "%s: %s: %m", __func__, ifp->name);
+			if (errno == ENOENT) {
+				syslog(LOG_ERR,
+				   "Packet Filter missing from kernel");
+				/* May as well disable IPv4 entirely at
+				 * this point as we really need it. */
+				ifp->options->options &= ~DHCPCD_IPV4;
+			} else
+				syslog(LOG_ERR, "%s: %s: %m",
+				    __func__, ifp->name);
 			return -1;
 		}
 		eloop_event_add(ifp->ctx->eloop,