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Obtain MTU of interface only when it would be used

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MTU were obtained early during iface_allowed check. But often it
returned from the function without ever using it. Because calls to
kernel might be costy, move fetching it only when it would be assigned.
This commit is contained in:
Petr Menšík
2021-03-02 21:38:02 +00:00
committed by Simon Kelley
parent 8b8a4148ec
commit a8c1474562
1 changed files with 6 additions and 4 deletions
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10
src/network.c
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@@ -232,7 +232,7 @@ static int iface_allowed(struct iface_param *param, int if_index, char *label,
union mysockaddr *addr, struct in_addr netmask, int prefixlen, int iface_flags)
{
struct irec *iface;
int mtu = 0, loopback;
int loopback;
struct ifreq ifr;
int tftp_ok = !!option_bool(OPT_TFTP);
int dhcp_ok = 1;
@@ -253,9 +253,6 @@ static int iface_allowed(struct iface_param *param, int if_index, char *label,
if (loopback)
dhcp_ok = 0;
if (ioctl(param->fd, SIOCGIFMTU, &ifr) != -1)
mtu = ifr.ifr_mtu;
if (!label)
label = ifr.ifr_name;
else
@@ -458,6 +455,11 @@ static int iface_allowed(struct iface_param *param, int if_index, char *label,
/* add to list */
if ((iface = whine_malloc(sizeof(struct irec))))
{
int mtu = 0;
if (ioctl(param->fd, SIOCGIFMTU, &ifr) != -1)
mtu = ifr.ifr_mtu;
iface->addr = *addr;
iface->netmask = netmask;
iface->tftp_ok = tftp_ok;