diff options
| -rw-r--r-- | sbin/dhclient/kroute.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/sbin/dhclient/kroute.c b/sbin/dhclient/kroute.c index 79e7436151a..d543f5c7aeb 100644 --- a/sbin/dhclient/kroute.c +++ b/sbin/dhclient/kroute.c @@ -1,4 +1,4 @@ -/* $OpenBSD: kroute.c,v 1.162 2019/05/10 16:51:13 benno Exp $ */ +/* $OpenBSD: kroute.c,v 1.163 2019/05/17 20:42:44 krw Exp $ */ /* * Copyright 2012 Kenneth R Westerback <krw@openbsd.org> @@ -792,12 +792,18 @@ set_mtu(char *name, int ioctlfd, uint16_t mtu) struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); - strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); - ifr.ifr_mtu = mtu; + if (ioctl(ioctlfd, SIOCGIFMTU, &ifr) == -1) { + log_warn("%s: SIOCGIFMTU", log_procname); + return; + } + if (ifr.ifr_mtu == mtu) + return; /* Avoid unnecessary RTM_IFINFO! */ + + ifr.ifr_mtu = mtu; if (ioctl(ioctlfd, SIOCSIFMTU, &ifr) == -1) - log_warn("%s: SIOCSIFMTU %d", log_procname, mtu); + log_warn("%s: SIOCSIFMTU %u", log_procname, mtu); } /* |