static struct dst_entry *rxe_find_route(struct net_device *ndev,
struct rxe_qp *qp,
struct rxe_av *av)
{
struct dst_entry *dst = NULL;
if (qp_type(qp) == IB_QPT_RC)
dst = sk_dst_get(qp->sk->sk);
if (!dst || !dst_check(dst, qp->dst_cookie)) {
if (dst)
dst_release(dst);
if (av->network_type == RDMA_NETWORK_IPV4) {
struct in_addr *saddr;
struct in_addr *daddr;
saddr = &av->sgid_addr._sockaddr_in.sin_addr;
daddr = &av->dgid_addr._sockaddr_in.sin_addr;
dst = rxe_find_route4(ndev, saddr, daddr);
} else if (av->network_type == RDMA_NETWORK_IPV6) {
struct in6_addr *saddr6;
struct in6_addr *daddr6;
saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
dst = rxe_find_route6(ndev, saddr6, daddr6);
#if IS_ENABLED(CONFIG_IPV6)
if (dst)
qp->dst_cookie =
rt6_get_cookie((struct rt6_info *)dst);
#endif
}
if (dst && (qp_type(qp) == IB_QPT_RC)) {
dst_hold(dst);
sk_dst_set(qp->sk->sk, dst);
}
}
return dst;
}
/*
* Get route to destination or remote server
*/
static int
__ip_vs_get_out_rt_v6(int skb_af, struct sk_buff *skb, struct ip_vs_dest *dest,
struct in6_addr *daddr, struct in6_addr *ret_saddr,
struct ip_vs_iphdr *ipvsh, int do_xfrm, int rt_mode)
{
struct net *net = dev_net(skb_dst(skb)->dev);
struct ip_vs_dest_dst *dest_dst;
struct rt6_info *rt; /* Route to the other host */
struct dst_entry *dst;
int mtu;
int local, noref = 1;
if (dest) {
dest_dst = __ip_vs_dst_check(dest);
if (likely(dest_dst))
rt = (struct rt6_info *) dest_dst->dst_cache;
else {
u32 cookie;
dest_dst = ip_vs_dest_dst_alloc();
spin_lock_bh(&dest->dst_lock);
if (!dest_dst) {
__ip_vs_dst_set(dest, NULL, NULL, 0);
spin_unlock_bh(&dest->dst_lock);
goto err_unreach;
}
dst = __ip_vs_route_output_v6(net, &dest->addr.in6,
&dest_dst->dst_saddr.in6,
do_xfrm, rt_mode);
if (!dst) {
__ip_vs_dst_set(dest, NULL, NULL, 0);
spin_unlock_bh(&dest->dst_lock);
ip_vs_dest_dst_free(dest_dst);
goto err_unreach;
}
rt = (struct rt6_info *) dst;
cookie = rt6_get_cookie(rt);
__ip_vs_dst_set(dest, dest_dst, &rt->dst, cookie);
spin_unlock_bh(&dest->dst_lock);
IP_VS_DBG(10, "new dst %pI6, src %pI6, refcnt=%d\n",
&dest->addr.in6, &dest_dst->dst_saddr.in6,
atomic_read(&rt->dst.__refcnt));
}
if (ret_saddr)
*ret_saddr = dest_dst->dst_saddr.in6;
} else {
noref = 0;
dst = __ip_vs_route_output_v6(net, daddr, ret_saddr, do_xfrm,
rt_mode);
if (!dst)
goto err_unreach;
rt = (struct rt6_info *) dst;
}
local = __ip_vs_is_local_route6(rt);
if (unlikely(crosses_local_route_boundary(skb_af, skb, rt_mode,
local))) {
IP_VS_DBG_RL("We are crossing local and non-local addresses"
" daddr=%pI6\n", daddr);
goto err_put;
}
if (unlikely(local)) {
/* skb to local stack, preserve old route */
if (!noref)
dst_release(&rt->dst);
return local;
}
/* MTU checking */
if (likely(!(rt_mode & IP_VS_RT_MODE_TUNNEL)))
mtu = dst_mtu(&rt->dst);
else {
mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr);
if (mtu < IPV6_MIN_MTU) {
IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__,
IPV6_MIN_MTU);
goto err_put;
}
maybe_update_pmtu(skb_af, skb, mtu);
}
if (!ensure_mtu_is_adequate(skb_af, rt_mode, ipvsh, skb, mtu))
goto err_put;
skb_dst_drop(skb);
if (noref) {
if (!local)
skb_dst_set_noref(skb, &rt->dst);
else
skb_dst_set(skb, dst_clone(&rt->dst));
} else
skb_dst_set(skb, &rt->dst);
return local;
err_put:
if (!noref)
dst_release(&rt->dst);
return -1;
err_unreach:
/* The ip6_link_failure function requires the dev field to be set
* in order to get the net (further for the sake of fwmark
* reflection).
*/
if (!skb->dev)
skb->dev = skb_dst(skb)->dev;
dst_link_failure(skb);
return -1;
}
