/* Some devices are known to send Neigbor Solicitation messages and
* require Neigbor Advertisement replies. The IPv6 core will not
* respond since IFF_NOARP is set, so we must handle them ourselves.
*/
static void do_neigh_solicit(struct usbnet *dev, u8 *buf, u16 tci)
{
struct ipv6hdr *iph = (void *)buf;
struct nd_msg *msg = (void *)(iph + 1);
struct net_device *netdev;
struct inet6_dev *in6_dev;
bool is_router;
/* we'll only respond to requests from unicast addresses to
* our solicited node addresses.
*/
if (!ipv6_addr_is_solict_mult(&iph->daddr) ||
!(ipv6_addr_type(&iph->saddr) & IPV6_ADDR_UNICAST))
return;
/* need to send the NA on the VLAN dev, if any */
rcu_read_lock();
if (tci) {
netdev = __vlan_find_dev_deep_rcu(dev->net, htons(ETH_P_8021Q),
tci);
if (!netdev) {
rcu_read_unlock();
return;
}
} else {
netdev = dev->net;
}
dev_hold(netdev);
rcu_read_unlock();
in6_dev = in6_dev_get(netdev);
if (!in6_dev)
goto out;
is_router = !!in6_dev->cnf.forwarding;
in6_dev_put(in6_dev);
/* ipv6_stub != NULL if in6_dev_get returned an inet6_dev */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,4,0)
ipv6_stub->ndisc_send_na(netdev, &iph->saddr, &msg->target,
is_router /* router */,
true /* solicited */,
false /* override */,
true /* inc_opt */);
#else
ipv6_stub->ndisc_send_na(netdev, NULL, &iph->saddr, &msg->target,
is_router, true, false, true);
#endif
out:
dev_put(netdev);
}
/* Some devices are known to send Neigbor Solicitation messages and
* require Neigbor Advertisement replies. The IPv6 core will not
* respond since IFF_NOARP is set, so we must handle them ourselves.
*/
static void do_neigh_solicit(struct usbnet *dev, u8 *buf, u16 tci)
{
struct ipv6hdr *iph = (void *)buf;
struct nd_msg *msg = (void *)(iph + 1);
struct net_device *netdev;
struct inet6_dev *in6_dev;
bool is_router;
/* we'll only respond to requests from unicast addresses to
* our solicited node addresses.
*/
if (!ipv6_addr_is_solict_mult(&iph->daddr) ||
!(ipv6_addr_type(&iph->saddr) & IPV6_ADDR_UNICAST))
return;
/* need to send the NA on the VLAN dev, if any */
if (tci)
netdev = __vlan_find_dev_deep(dev->net, htons(ETH_P_8021Q),
tci);
else
netdev = dev->net;
if (!netdev)
return;
in6_dev = in6_dev_get(netdev);
if (!in6_dev)
return;
is_router = !!in6_dev->cnf.forwarding;
in6_dev_put(in6_dev);
/* ipv6_stub != NULL if in6_dev_get returned an inet6_dev */
ipv6_stub->ndisc_send_na(netdev, NULL, &iph->saddr, &msg->target,
is_router /* router */,
true /* solicited */,
false /* override */,
true /* inc_opt */);
}
