diff options
Diffstat (limited to 'freebsd/sbin/dhclient/dispatch.c')
| -rw-r--r-- | freebsd/sbin/dhclient/dispatch.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/freebsd/sbin/dhclient/dispatch.c b/freebsd/sbin/dhclient/dispatch.c index a9cc65b7..b815e6b8 100644 --- a/freebsd/sbin/dhclient/dispatch.c +++ b/freebsd/sbin/dhclient/dispatch.c @@ -59,8 +59,8 @@ __FBSDID("$FreeBSD$"); /* Assert that pointer p is aligned to at least align bytes */ #define assert_aligned(p, align) assert((((uintptr_t)p) & ((align) - 1)) == 0) -struct protocol *protocols; -struct timeout *timeouts; +static struct protocol *protocols; +static struct timeout *timeouts; static struct timeout *free_timeouts; static int interfaces_invalidated; void (*bootp_packet_handler)(struct interface_info *, @@ -549,17 +549,29 @@ interface_set_mtu_priv(char *ifname, u_int16_t mtu) { struct ifreq ifr; int sock; + u_int16_t old_mtu; if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) error("Can't create socket"); memset(&ifr, 0, sizeof(ifr)); + old_mtu = 0; strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); - ifr.ifr_mtu = mtu; - if (ioctl(sock, SIOCSIFMTU, &ifr) == -1) - warning("SIOCSIFMTU failed (%d): %s", mtu, + if (ioctl(sock, SIOCGIFMTU, (caddr_t)&ifr) == -1) + warning("SIOCGIFMTU failed (%s): %s", ifname, strerror(errno)); + else + old_mtu = ifr.ifr_mtu; + + if (mtu != old_mtu) { + ifr.ifr_mtu = mtu; + + if (ioctl(sock, SIOCSIFMTU, &ifr) == -1) + warning("SIOCSIFMTU failed (%d): %s", mtu, + strerror(errno)); + } + close(sock); } |