static int
link_netlink(struct dhcpcd_ctx *ctx, struct interface *ifp,
struct nlmsghdr *nlm)
{
int r;
size_t len;
struct rtattr *rta, *hwaddr;
struct ifinfomsg *ifi;
char ifn[IF_NAMESIZE + 1];
r = link_route(ctx, ifp, nlm);
if (r != 0)
return r;
r = link_addr(ctx, ifp, nlm);
if (r != 0)
return r;
#ifdef INET6
r = link_neigh(ctx, ifp, nlm);
if (r != 0)
return r;
#endif
if (nlm->nlmsg_type != RTM_NEWLINK && nlm->nlmsg_type != RTM_DELLINK)
return 0;
len = nlm->nlmsg_len - sizeof(*nlm);
if ((size_t)len < sizeof(*ifi)) {
errno = EBADMSG;
return -1;
}
ifi = NLMSG_DATA(nlm);
if (ifi->ifi_flags & IFF_LOOPBACK)
return 0;
rta = (void *)((char *)ifi + NLMSG_ALIGN(sizeof(*ifi)));
len = NLMSG_PAYLOAD(nlm, sizeof(*ifi));
*ifn = '\0';
hwaddr = NULL;
while (RTA_OK(rta, len)) {
switch (rta->rta_type) {
case IFLA_WIRELESS:
/* Ignore wireless messages */
if (nlm->nlmsg_type == RTM_NEWLINK &&
ifi->ifi_change == 0)
return 0;
break;
case IFLA_IFNAME:
strlcpy(ifn, (char *)RTA_DATA(rta), sizeof(ifn));
break;
case IFLA_ADDRESS:
hwaddr = rta;
break;
}
rta = RTA_NEXT(rta, len);
}
if (nlm->nlmsg_type == RTM_DELLINK) {
/* If are listening to a dev manager, let that remove
* the interface rather than the kernel. */
if (dev_listening(ctx) < 1)
dhcpcd_handleinterface(ctx, -1, ifn);
return 0;
}
/* Virtual interfaces may not get a valid hardware address
* at this point.
* To trigger a valid hardware address pickup we need to pretend
* that that don't exist until they have one. */
if (ifi->ifi_flags & IFF_MASTER && !hwaddr) {
dhcpcd_handleinterface(ctx, -1, ifn);
return 0;
}
/* Check for a new interface */
ifp = if_findindex(ctx->ifaces, (unsigned int)ifi->ifi_index);
if (ifp == NULL) {
/* If are listening to a dev manager, let that announce
* the interface rather than the kernel. */
if (dev_listening(ctx) < 1)
dhcpcd_handleinterface(ctx, 1, ifn);
return 0;
}
/* Handle interface being renamed */
if (strcmp(ifp->name, ifn) != 0) {
dhcpcd_handleinterface(ctx, -1, ifn);
dhcpcd_handleinterface(ctx, 1, ifn);
return 0;
}
/* Re-read hardware address and friends */
if (!(ifi->ifi_flags & IFF_UP) && hwaddr) {
uint8_t l;
l = l2addr_len(ifi->ifi_type);
if (hwaddr->rta_len == RTA_LENGTH(l))
dhcpcd_handlehwaddr(ctx, ifn, RTA_DATA(hwaddr), l);
}
dhcpcd_handlecarrier(ctx,
ifi->ifi_flags & IFF_RUNNING ? LINK_UP : LINK_DOWN,
ifi->ifi_flags, ifn);
return 0;
}
static int
link_netlink(struct nlmsghdr *nlm)
{
int len;
struct rtattr *rta, *hwaddr;
struct ifinfomsg *ifi;
char ifn[IF_NAMESIZE + 1];
struct interface *ifp;
len = link_route(nlm);
if (len != 0)
return len;
len = link_addr(nlm);
if (len != 0)
return len;
if (nlm->nlmsg_type != RTM_NEWLINK && nlm->nlmsg_type != RTM_DELLINK)
return 0;
len = nlm->nlmsg_len - sizeof(*nlm);
if ((size_t)len < sizeof(*ifi)) {
errno = EBADMSG;
return -1;
}
ifi = NLMSG_DATA(nlm);
if (ifi->ifi_flags & IFF_LOOPBACK)
return 1;
rta = (struct rtattr *)(void *)((char *)ifi +NLMSG_ALIGN(sizeof(*ifi)));
len = NLMSG_PAYLOAD(nlm, sizeof(*ifi));
*ifn = '\0';
hwaddr = NULL;
while (RTA_OK(rta, len)) {
switch (rta->rta_type) {
case IFLA_WIRELESS:
/* Ignore wireless messages */
if (nlm->nlmsg_type == RTM_NEWLINK &&
ifi->ifi_change == 0)
return 1;
break;
case IFLA_IFNAME:
strlcpy(ifn, RTA_DATA(rta), sizeof(ifn));
break;
case IFLA_ADDRESS:
hwaddr = rta;
break;
}
rta = RTA_NEXT(rta, len);
}
if (nlm->nlmsg_type == RTM_DELLINK) {
handle_interface(-1, ifn);
return 1;
}
/* Virtual interfaces may not get a valid hardware address
* at this point.
* To trigger a valid hardware address pickup we need to pretend
* that that don't exist until they have one. */
if (ifi->ifi_flags & IFF_MASTER && !hwaddr) {
handle_interface(-1, ifn);
return 1;
}
/* Check for interface name change */
if (handle_rename(ifi->ifi_index, ifn))
return 1;
/* Check for a new interface */
ifp = find_interface(ifn);
if (ifp == NULL) {
/* If are listening to a dev manager, let that announce
* the interface rather than the kernel. */
if (dev_listening() < 1)
handle_interface(1, ifn);
return 1;
}
/* Re-read hardware address and friends */
if (!(ifi->ifi_flags & IFF_UP) && hwaddr) {
len = l2addr_len(ifi->ifi_type);
if (hwaddr->rta_len == RTA_LENGTH(len))
handle_hwaddr(ifn, RTA_DATA(hwaddr), len);
}
handle_carrier(ifi->ifi_flags & IFF_RUNNING ? LINK_UP : LINK_DOWN,
ifi->ifi_flags, ifn);
return 1;
}