dhcpcd-discuss

On 19/08/2019 09:04, Yegor Yefremov wrote:
> > Can you provide logs of dhcpcd not working on one, or access to such a
> > device via ssh?
>
> # dhcpcd wwan0
> wwan0: unsupported interface family 00
> wwan0: waiting for carrier
> wwan0: carrier acquired
> DUID 00:01:00:01:c7:92:bc:92:74:6a:8f:ff:50:55
> wwan0: IAID 00:00:00:06
> wwan0: using static address 169.254.227.48/16
> arp_open: wwan0: Invalid argument
> arp_announce: Invalid argument
> forked to background, child pid 354
>
> This is how the interface looks like:
>
> # ip addr show wwan0
> 6: wwan0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc
> pfifo_fast state UNKNOWN group default qlen 1000
>      link/none
>      inet 169.254.227.48/16 brd 169.254.255.255 scope global noprefixroute wwan0
>         valid_lft forever preferred_lft forever
>
> And this is what happens with udhcpc:
>
> # udhcpc -i wwan0
> udhcpc: started, v1.31.0
> udhcpc: sending discover
> udhcpc: sending select for 10.50.235.7
> udhcpc: lease of 10.50.235.7 obtained, lease time 7200
> deleting routers
> adding dns 62.109.121.17
> adding dns 62.109.121.18

The attached patch should fix what you've noted thus far.
However, the default dhcpcd action for PtP interfaces is to let a 3rd 
party configure the address - dhcpcd will wait for it to appear. I don't 
want to change this, so you'll need this in /etc/dhcpcd.conf

interface wwan0
	dhcp

Then it should work.

Let me know - but please add the -d flag or add `debug` to dhcpcd.conf 
so I can get more detailed information.

Roy

diff --git a/src/dhcp.c b/src/dhcp.c
index 245ad5c4..8e48592f 100644
--- a/src/dhcp.c
+++ b/src/dhcp.c
@@ -2365,7 +2365,10 @@ dhcp_arp_address(struct interface *ifp)
 		return 0;
 	}
 #else
-	if (ifp->options->options & DHCPCD_ARP && ia == NULL) {
+	if (!(ifp->flags & IFF_NOARP) &&
+	    ifp->options->options & DHCPCD_ARP &&
+	    ia == NULL)
+	{
 		struct arp_state *astate;
 		struct dhcp_lease l;
 
diff --git a/src/dhcpcd.c b/src/dhcpcd.c
index bddd316b..d2b8bd91 100644
--- a/src/dhcpcd.c
+++ b/src/dhcpcd.c
@@ -458,11 +458,10 @@ configure_interface1(struct interface *ifp)
 		ifo->options &= ~DHCPCD_ARP;
 		if (!(ifp->flags & IFF_MULTICAST))
 			ifo->options &= ~DHCPCD_IPV6RS;
-		if (!(ifo->options & DHCPCD_INFORM))
+		if (!(ifo->options & (DHCPCD_INFORM | DHCPCD_WANTDHCP)))
 			ifo->options |= DHCPCD_STATIC;
 	}
-	if (ifp->flags & IFF_NOARP ||
-	    !(ifo->options & DHCPCD_ARP) ||
+	if (!(ifo->options & DHCPCD_ARP) ||
 	    ifo->options & (DHCPCD_INFORM | DHCPCD_STATIC))
 		ifo->options &= ~DHCPCD_IPV4LL;
 
diff --git a/src/if-options.c b/src/if-options.c
index 0213de75..f0165c13 100644
--- a/src/if-options.c
+++ b/src/if-options.c
@@ -2062,7 +2062,7 @@ err_sla:
 		ifo->auth.options &= ~DHCPCD_AUTH_REQUIRE;
 		break;
 	case O_DHCP:
-		ifo->options |= DHCPCD_DHCP | DHCPCD_IPV4;
+		ifo->options |= DHCPCD_DHCP | DHCPCD_WANTDHCP | DHCPCD_IPV4;
 		break;
 	case O_NODHCP:
 		ifo->options &= ~DHCPCD_DHCP;
diff --git a/src/if-options.h b/src/if-options.h
index 4f720d32..d0eb764a 100644
--- a/src/if-options.h
+++ b/src/if-options.h
@@ -110,7 +110,7 @@
 #define DHCPCD_DHCP6			(1ULL << 50)
 #define DHCPCD_IF_UP			(1ULL << 51)
 #define DHCPCD_INFORM6			(1ULL << 52)
-// unused				(1ULL << 53)
+#define DHCPCD_WANTDHCP			(1ULL << 53)
 #define DHCPCD_IPV6RA_AUTOCONF		(1ULL << 54)
 #define DHCPCD_ROUTER_HOST_ROUTE_WARNED	(1ULL << 55)
 #define DHCPCD_LASTLEASE_EXTEND		(1ULL << 56)
diff --git a/src/if.c b/src/if.c
index fe84a882..857294ef 100644
--- a/src/if.c
+++ b/src/if.c
@@ -528,6 +528,9 @@ if_discover(struct dhcpcd_ctx *ctx, struct ifaddrs **ifaddrs,
 			    ctx->ifac == 0 && !if_hasconf(ctx, ifp->name))
 				active = IF_INACTIVE;
 			switch (ifp->family) {
+#ifdef ARPHRD_NETROM
+			case ARPHRD_NETROM:
+#endif
 			case ARPHRD_IEEE1394:
 			case ARPHRD_INFINIBAND:
 #ifdef ARPHRD_LOOPBACK