int ip6_rt_addr_add(struct in6_addr *addr, struct net_device *dev)
{
struct rt6_info *rt;
rt = dst_alloc(&ip6_dst_ops);
if (rt == NULL)
return -ENOMEM;
rt->u.dst.flags = DST_HOST;
rt->u.dst.input = ip6_input;
rt->u.dst.output = ip6_output;
rt->rt6i_dev = dev_get_by_name("lo");
rt->u.dst.pmtu = ipv6_get_mtu(rt->rt6i_dev);
rt->u.dst.advmss = max_t(unsigned int, rt->u.dst.pmtu - 60, ip6_rt_min_advmss);
if (rt->u.dst.advmss > 65535-20)
rt->u.dst.advmss = 65535;
rt->rt6i_hoplimit = ipv6_get_hoplimit(rt->rt6i_dev);
rt->u.dst.obsolete = -1;
rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
if (rt->rt6i_nexthop == NULL) {
dst_free((struct dst_entry *) rt);
return -ENOMEM;
}
ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
rt->rt6i_dst.plen = 128;
rt6_ins(rt, NULL);
return 0;
}
/* Route the packet according to the routing keys specified in
* route_info. Keys are :
* - ifindex :
* 0 if no oif preferred,
* otherwise set to the index of the desired oif
* - route_info->gw :
* 0 if no gateway specified,
* otherwise set to the next host to which the pkt must be routed
* If success, skb->dev is the output device to which the packet must
* be sent and skb->dst is not NULL
*
* RETURN: 1 if the packet was succesfully routed to the
* destination desired
* 0 if the kernel routing table could not route the packet
* according to the keys specified
*/
static int
route6(struct sk_buff *skb,
unsigned int ifindex,
const struct ip6t_route_target_info *route_info)
{
struct rt6_info *rt = NULL;
struct ipv6hdr *ipv6h = skb->nh.ipv6h;
struct in6_addr *gw = (struct in6_addr*)&route_info->gw;
DEBUGP("ip6t_ROUTE: called with: ");
DEBUGP("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(ipv6h->daddr));
DEBUGP("GATEWAY=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(*gw));
DEBUGP("OUT=%s\n", route_info->oif);
if (ipv6_addr_any(gw))
rt = rt6_lookup(&ipv6h->daddr, &ipv6h->saddr, ifindex, 1);
else
rt = rt6_lookup(gw, &ipv6h->saddr, ifindex, 1);
if (!rt)
goto no_route;
DEBUGP("ip6t_ROUTE: routing gives: ");
DEBUGP("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(rt->rt6i_dst.addr));
DEBUGP("GATEWAY=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(rt->rt6i_gateway));
DEBUGP("OUT=%s\n", rt->rt6i_dev->name);
if (ifindex && rt->rt6i_dev->ifindex!=ifindex)
goto wrong_route;
if (!rt->rt6i_nexthop) {
DEBUGP("ip6t_ROUTE: discovering neighbour\n");
rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_dst.addr);
}
/* Drop old route. */
dst_release(skb->dst);
skb->dst = &rt->u.dst;
skb->dev = rt->rt6i_dev;
return 1;
wrong_route:
dst_release(&rt->u.dst);
no_route:
if (!net_ratelimit())
return 0;
printk("ip6t_ROUTE: no explicit route found ");
if (ifindex)
printk("via interface %s ", route_info->oif);
if (!ipv6_addr_any(gw))
printk("via gateway %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x", NIP6(*gw));
printk("\n");
return 0;
}
static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr,
struct in6_addr *saddr)
{
int err;
struct rt6_info *rt;
/*
* Clone the route.
*/
rt = ip6_rt_copy(ort);
if (rt) {
ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
if (!(rt->rt6i_flags&RTF_GATEWAY))
ipv6_addr_copy(&rt->rt6i_gateway, daddr);
rt->rt6i_dst.plen = 128;
rt->rt6i_flags |= RTF_CACHE;
rt->u.dst.flags |= DST_HOST;
#ifdef CONFIG_IPV6_SUBTREES
if (rt->rt6i_src.plen && saddr) {
ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
rt->rt6i_src.plen = 128;
}
#endif
rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
dst_hold(&rt->u.dst);
err = rt6_ins(rt, NULL);
if (err == 0)
return rt;
rt->u.dst.error = err;
return rt;
}
dst_hold(&ip6_null_entry.u.dst);
return &ip6_null_entry;
}
