inet_arp_init_ifaddr
Declaration
void inet_arp_init_ifaddr(ifnet_t interface, ifaddr_t ipaddr);Parameters
- interface:
The interface the packet was received on.
- ipaddr:
The ip interface address.
Discussion
This function should be called in two places, when an IP address is added and when the hardware address changes. This function will setup the ifaddr_t for use with the IP ARP functions. This function will also trigger the transmission of a gratuitous ARP packet.
When the SIOCSIFADDR ioctl is handled, the data parameter will be an ifaddr_t. If this is an IP address, inet_arp_init_ifaddr should be called. This is usually performed in the protocol attachment's ioctl handler.
When the event handler for the protocol attachment receives a KEV_DL_LINK_ADDRESS_CHANGED event, the event handler should call inet_arp_init_ifaddr for each interface ip address.
For an example, see bsd/net/ether_inet_pr_module.c in xnu. Search for inet_arp_init_ifaddr.