Detect VLANID to use in IAID.

Summary:
This only works if the VLAN interface has already been setup prior
to starting dhcpcd.

Initial fix for T115.

Test Plan:
Configure a vlan interface.
Don't set any iaid in /etc/dhcpcd.conf.
Start dhcpcd, check VLANID is used for IAID.

Reviewers: sthen

Reviewed By: sthen

Tags: #dhcpcd

Differential Revision: https://dev.marples.name/D107

1 files changed, 2 insertions, 0 deletions

diff --git a/src/if.c b/src/if.c
index 71385eef..bcf14f2d 100644
--- a/src/if.c
+++ b/src/if.c
@@ -516,6 +516,8 @@ if_discover(struct dhcpcd_ctx *ctx, int argc, char * const *argv)
 			}
 		}
 
+		ifp->vlanid = if_vlanid(ifp);
+
 #ifdef SIOCGIFPRIORITY
 		/* Respect the interface priority */
 		memset(&ifr, 0, sizeof(ifr));