Commit message: ipv6: add support of equal cost multipath (ECMP)

Each nexthop is added like a single route in the routing table. All routes
that have the same metric/weight and destination but not the same gateway
are considering as ECMP routes. They are linked together, through a list called
rt6i_siblings.

ECMP routes can be added in one shot, with RTA_MULTIPATH attribute or one after
the other (in both case, the flag NLM_F_EXCL should not be set).

The patch is based on a previous work from
Luc Saillard <luc.saillard@6wind.com>.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
CVE: CVE-2013-4125
Vulnerability description: The fib6_add_rt2node function in net/ipv6/ip6_fib.c in the IPv6 stack in the Linux kernel through 3.10.1 does not properly handle Router Advertisement (RA) messages in certain circumstances involving three routes that initially qualified for membership in an ECMP route set until a change occurred for one of the first two routes, which allows remote attackers to cause a denial of service (system crash) via a crafted sequence of messages.

Project: linux
File: route.c

static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
				      const struct in6_addr *daddr,
				      const struct in6_addr *saddr)
{
	struct rt6_info *rt;

	/*
	 *	Clone the route.
	 */

	rt = ip6_rt_copy(ort, daddr);

	if (rt) {
		int attempts = !in_softirq();

		if (!(rt->rt6i_flags & RTF_GATEWAY)) {
			if (ort->rt6i_dst.plen != 128 &&
			    ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
				rt->rt6i_flags |= RTF_ANYCAST;
			rt->rt6i_gateway = *daddr;
		}

		rt->rt6i_flags |= RTF_CACHE;

#ifdef CONFIG_IPV6_SUBTREES
		if (rt->rt6i_src.plen && saddr) {
			rt->rt6i_src.addr = *saddr;
			rt->rt6i_src.plen = 128;
		}
#endif

	retry:
		if (rt6_bind_neighbour(rt, rt->dst.dev)) {
			struct net *net = dev_net(rt->dst.dev);
			int saved_rt_min_interval =
				net->ipv6.sysctl.ip6_rt_gc_min_interval;
			int saved_rt_elasticity =
				net->ipv6.sysctl.ip6_rt_gc_elasticity;

			if (attempts-- > 0) {
				net->ipv6.sysctl.ip6_rt_gc_elasticity = 1;
				net->ipv6.sysctl.ip6_rt_gc_min_interval = 0;

				ip6_dst_gc(&net->ipv6.ip6_dst_ops);

				net->ipv6.sysctl.ip6_rt_gc_elasticity =
					saved_rt_elasticity;
				net->ipv6.sysctl.ip6_rt_gc_min_interval =
					saved_rt_min_interval;
				goto retry;
			}

			net_warn_ratelimited("Neighbour table overflow\n");
			dst_free(&rt->dst);
			return NULL;
		}
	}

	return rt;
}

Project: linux
File: route.c

static int ip6_route_dev_notify(struct notifier_block *this,
				unsigned long event, void *data)
{
	struct net_device *dev = (struct net_device *)data;
	struct net *net = dev_net(dev);

	if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
		net->ipv6.ip6_null_entry->dst.dev = dev;
		net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
		net->ipv6.ip6_prohibit_entry->dst.dev = dev;
		net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
		net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
		net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
#endif
	}

	return NOTIFY_OK;
}

Project: linux
File: route.c

static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
			      struct fib6_config *cfg)
{
	struct rtmsg *rtm;
	struct nlattr *tb[RTA_MAX+1];
	int err;

	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;

	err = -EINVAL;
	rtm = nlmsg_data(nlh);
	memset(cfg, 0, sizeof(*cfg));

	cfg->fc_table = rtm->rtm_table;
	cfg->fc_dst_len = rtm->rtm_dst_len;
	cfg->fc_src_len = rtm->rtm_src_len;
	cfg->fc_flags = RTF_UP;
	cfg->fc_protocol = rtm->rtm_protocol;
	cfg->fc_type = rtm->rtm_type;

	if (rtm->rtm_type == RTN_UNREACHABLE ||
	    rtm->rtm_type == RTN_BLACKHOLE ||
	    rtm->rtm_type == RTN_PROHIBIT ||
	    rtm->rtm_type == RTN_THROW)
		cfg->fc_flags |= RTF_REJECT;

	if (rtm->rtm_type == RTN_LOCAL)
		cfg->fc_flags |= RTF_LOCAL;

	cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
	cfg->fc_nlinfo.nlh = nlh;
	cfg->fc_nlinfo.nl_net = sock_net(skb->sk);

	if (tb[RTA_GATEWAY]) {
		nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
		cfg->fc_flags |= RTF_GATEWAY;
	}

	if (tb[RTA_DST]) {
		int plen = (rtm->rtm_dst_len + 7) >> 3;

		if (nla_len(tb[RTA_DST]) < plen)
			goto errout;

		nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
	}

	if (tb[RTA_SRC]) {
		int plen = (rtm->rtm_src_len + 7) >> 3;

		if (nla_len(tb[RTA_SRC]) < plen)
			goto errout;

		nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
	}

	if (tb[RTA_PREFSRC])
		nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);

	if (tb[RTA_OIF])
		cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);

	if (tb[RTA_PRIORITY])
		cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);

	if (tb[RTA_METRICS]) {
		cfg->fc_mx = nla_data(tb[RTA_METRICS]);
		cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
	}

	if (tb[RTA_TABLE])
		cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);

	if (tb[RTA_MULTIPATH]) {
		cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
		cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
	}

	err = 0;
errout:
	return err;
}

Project: linux
File: route.c

static inline void rt6_probe(struct rt6_info *rt)
{
}

Project: linux
File: route.c

static int ip6_pkt_prohibit_out(struct sk_buff *skb)
{
	skb->dev = skb_dst(skb)->dev;
	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
}

Project: linux
File: route.c

static int ip6_route_multipath(struct fib6_config *cfg, int add)
{
	struct fib6_config r_cfg;
	struct rtnexthop *rtnh;
	int remaining;
	int attrlen;
	int err = 0, last_err = 0;

beginning:
	rtnh = (struct rtnexthop *)cfg->fc_mp;
	remaining = cfg->fc_mp_len;

	/* Parse a Multipath Entry */
	while (rtnh_ok(rtnh, remaining)) {
		memcpy(&r_cfg, cfg, sizeof(*cfg));
		if (rtnh->rtnh_ifindex)
			r_cfg.fc_ifindex = rtnh->rtnh_ifindex;

		attrlen = rtnh_attrlen(rtnh);
		if (attrlen > 0) {
			struct nlattr *nla, *attrs = rtnh_attrs(rtnh);

			nla = nla_find(attrs, attrlen, RTA_GATEWAY);
			if (nla) {
				nla_memcpy(&r_cfg.fc_gateway, nla, 16);
				r_cfg.fc_flags |= RTF_GATEWAY;
			}
		}
		err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
		if (err) {
			last_err = err;
			/* If we are trying to remove a route, do not stop the
			 * loop when ip6_route_del() fails (because next hop is
			 * already gone), we should try to remove all next hops.
			 */
			if (add) {
				/* If add fails, we should try to delete all
				 * next hops that have been already added.
				 */
				add = 0;
				goto beginning;
			}
		}
		rtnh = rtnh_next(rtnh, &remaining);
	}

	return last_err;
}

Project: linux
File: route.c

static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
{
	struct rt6_info *rt;

	rt = (struct rt6_info *) dst;

	/* All IPV6 dsts are created with ->obsolete set to the value
	 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
	 * into this function always.
	 */
	if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev)))
		return NULL;

	if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) {
		if (rt->rt6i_peer_genid != rt6_peer_genid()) {
			if (!rt6_has_peer(rt))
				rt6_bind_peer(rt, 0);
			rt->rt6i_peer_genid = rt6_peer_genid();
		}
		return dst;
	}
	return NULL;
}

Project: linux
File: route.c

void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
		     int oif, u32 mark)
{
	const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
	struct dst_entry *dst;
	struct flowi6 fl6;

	memset(&fl6, 0, sizeof(fl6));
	fl6.flowi6_oif = oif;
	fl6.flowi6_mark = mark;
	fl6.flowi6_flags = 0;
	fl6.daddr = iph->daddr;
	fl6.saddr = iph->saddr;
	fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK;

	dst = ip6_route_output(net, NULL, &fl6);
	if (!dst->error)
		ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
	dst_release(dst);
}

Project: linux
File: route.c

struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
{
	struct rt6_info *rt;
	struct fib6_table *table;

	table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
	if (!table)
		return NULL;

	read_lock_bh(&table->tb6_lock);
	for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
		if (dev == rt->dst.dev &&
		    ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
		    ipv6_addr_equal(&rt->rt6i_gateway, addr))
			break;
	}
	if (rt)
		dst_hold(&rt->dst);
	read_unlock_bh(&table->tb6_lock);
	return rt;
}

Project: linux
File: route.c

static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
				      struct flowi6 *fl6, int flags)
{
	struct fib6_node *fn;
	struct rt6_info *rt, *nrt;
	int strict = 0;
	int attempts = 3;
	int err;
	int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;

	strict |= flags & RT6_LOOKUP_F_IFACE;

relookup:
	read_lock_bh(&table->tb6_lock);

restart_2:
	fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);

restart:
	rt = rt6_select(fn, oif, strict | reachable);
	if (rt->rt6i_nsiblings && oif == 0)
		rt = rt6_multipath_select(rt, fl6);
	BACKTRACK(net, &fl6->saddr);
	if (rt == net->ipv6.ip6_null_entry ||
	    rt->rt6i_flags & RTF_CACHE)
		goto out;

	dst_hold(&rt->dst);
	read_unlock_bh(&table->tb6_lock);

	if (!rt->n && !(rt->rt6i_flags & RTF_NONEXTHOP))
		nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
	else if (!(rt->dst.flags & DST_HOST))
		nrt = rt6_alloc_clone(rt, &fl6->daddr);
	else
		goto out2;

	dst_release(&rt->dst);
	rt = nrt ? : net->ipv6.ip6_null_entry;

	dst_hold(&rt->dst);
	if (nrt) {
		err = ip6_ins_rt(nrt);
		if (!err)
			goto out2;
	}

	if (--attempts <= 0)
		goto out2;

	/*
	 * Race condition! In the gap, when table->tb6_lock was
	 * released someone could insert this route.  Relookup.
	 */
	dst_release(&rt->dst);
	goto relookup;

out:
	if (reachable) {
		reachable = 0;
		goto restart_2;
	}
	dst_hold(&rt->dst);
	read_unlock_bh(&table->tb6_lock);
out2:
	rt->dst.lastuse = jiffies;
	rt->dst.__use++;

	return rt;
}

Project: linux
File: route.c

void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
{
	struct net *net = dev_net(ifp->idev->dev);
	struct arg_dev_net_ip adni = {
		.dev = ifp->idev->dev,
		.net = net,
		.addr = &ifp->addr,
	};
	fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
}

Project: linux
File: route.c

static void rtmsg_to_fib6_config(struct net *net,
				 struct in6_rtmsg *rtmsg,
				 struct fib6_config *cfg)
{
	memset(cfg, 0, sizeof(*cfg));

	cfg->fc_table = RT6_TABLE_MAIN;
	cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
	cfg->fc_metric = rtmsg->rtmsg_metric;
	cfg->fc_expires = rtmsg->rtmsg_info;
	cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
	cfg->fc_src_len = rtmsg->rtmsg_src_len;
	cfg->fc_flags = rtmsg->rtmsg_flags;

	cfg->fc_nlinfo.nl_net = net;

	cfg->fc_dst = rtmsg->rtmsg_dst;
	cfg->fc_src = rtmsg->rtmsg_src;
	cfg->fc_gateway = rtmsg->rtmsg_gateway;
}

Project: linux
File: route.c

static u32 rt6_peer_genid(void)
{
	return atomic_read(&__rt6_peer_genid);
}

Project: linux
File: ip6_fib.c

int __init fib6_init(void)
{
	int ret = -ENOMEM;

	fib6_node_kmem = kmem_cache_create("fib6_nodes",
					   sizeof(struct fib6_node),
					   0, SLAB_HWCACHE_ALIGN,
					   NULL);
	if (!fib6_node_kmem)
		goto out;

	ret = register_pernet_subsys(&fib6_net_ops);
	if (ret)
		goto out_kmem_cache_create;

	ret = __rtnl_register(PF_INET6, RTM_GETROUTE, NULL, inet6_dump_fib,
			      NULL);
	if (ret)
		goto out_unregister_subsys;
out:
	return ret;

out_unregister_subsys:
	unregister_pernet_subsys(&fib6_net_ops);
out_kmem_cache_create:
	kmem_cache_destroy(fib6_node_kmem);
	goto out;
}

Project: linux
File: route.c

static inline int rt6_check_neigh(struct rt6_info *rt)
{
	struct neighbour *neigh;
	int m;

	neigh = rt->n;
	if (rt->rt6i_flags & RTF_NONEXTHOP ||
	    !(rt->rt6i_flags & RTF_GATEWAY))
		m = 1;
	else if (neigh) {
		read_lock_bh(&neigh->lock);
		if (neigh->nud_state & NUD_VALID)
			m = 2;
#ifdef CONFIG_IPV6_ROUTER_PREF
		else if (neigh->nud_state & NUD_FAILED)
			m = 0;
#endif
		else
			m = 1;
		read_unlock_bh(&neigh->lock);
	} else
		m = 0;
	return m;
}

Project: linux
File: route.c

static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
{
	struct rt6_info *match, *rt0;
	struct net *net;

	rt0 = fn->rr_ptr;
	if (!rt0)
		fn->rr_ptr = rt0 = fn->leaf;

	match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);

	if (!match &&
	    (strict & RT6_LOOKUP_F_REACHABLE)) {
		struct rt6_info *next = rt0->dst.rt6_next;

		/* no entries matched; do round-robin */
		if (!next || next->rt6i_metric != rt0->rt6i_metric)
			next = fn->leaf;

		if (next != rt0)
			fn->rr_ptr = next;
	}

	net = dev_net(rt0->dst.dev);
	return match ? match : net->ipv6.ip6_null_entry;
}

Project: linux
File: ip6_fib.c

void fib6_clean_all_ro(struct net *net, int (*func)(struct rt6_info *, void *arg),
		    int prune, void *arg)
{
	struct fib6_table *table;
	struct hlist_node *node;
	struct hlist_head *head;
	unsigned int h;

	rcu_read_lock();
	for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
		head = &net->ipv6.fib_table_hash[h];
		hlist_for_each_entry_rcu(table, node, head, tb6_hlist) {
			read_lock_bh(&table->tb6_lock);
			fib6_clean_tree(net, &table->tb6_root,
					func, prune, arg);
			read_unlock_bh(&table->tb6_lock);
		}
	}
	rcu_read_unlock();
}

Project: linux
File: route.c

static struct rt6_info *ip6_pol_route_lookup(struct net *net,
					     struct fib6_table *table,
					     struct flowi6 *fl6, int flags)
{
	struct fib6_node *fn;
	struct rt6_info *rt;

	read_lock_bh(&table->tb6_lock);
	fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
restart:
	rt = fn->leaf;
	rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
	if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
		rt = rt6_multipath_select(rt, fl6);
	BACKTRACK(net, &fl6->saddr);
out:
	dst_use(&rt->dst, jiffies);
	read_unlock_bh(&table->tb6_lock);
	return rt;

}

Project: linux
File: route.c

static bool rt6_need_strict(const struct in6_addr *daddr)
{
	return ipv6_addr_type(daddr) &
		(IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
}

Project: linux
File: route.c

static inline size_t rt6_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct rtmsg))
	       + nla_total_size(16) /* RTA_SRC */
	       + nla_total_size(16) /* RTA_DST */
	       + nla_total_size(16) /* RTA_GATEWAY */
	       + nla_total_size(16) /* RTA_PREFSRC */
	       + nla_total_size(4) /* RTA_TABLE */
	       + nla_total_size(4) /* RTA_IIF */
	       + nla_total_size(4) /* RTA_OIF */
	       + nla_total_size(4) /* RTA_PRIORITY */
	       + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
	       + nla_total_size(sizeof(struct rta_cacheinfo));
}

Project: linux
File: route.c

static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
{
	struct rt6_info *rt = (struct rt6_info *) dst;

	if (rt) {
		if (rt->rt6i_flags & RTF_CACHE) {
			if (rt6_check_expired(rt)) {
				ip6_del_rt(rt);
				dst = NULL;
			}
		} else {
			dst_release(dst);
			dst = NULL;
		}
	}
	return dst;
}

Project: linux
File: route.c

static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
{
	int err;
	struct fib6_table *table;

	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
	err = fib6_add(&table->tb6_root, rt, info);
	write_unlock_bh(&table->tb6_lock);

	return err;
}

Project: linux
File: route.c

static inline struct rt6_info *ip6_dst_alloc(struct net *net,
					     struct net_device *dev,
					     int flags,
					     struct fib6_table *table)
{
	struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
					0, DST_OBSOLETE_FORCE_CHK, flags);

	if (rt) {
		struct dst_entry *dst = &rt->dst;

		memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
		rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
		rt->rt6i_genid = rt_genid(net);
		INIT_LIST_HEAD(&rt->rt6i_siblings);
		rt->rt6i_nsiblings = 0;
	}
	return rt;
}

Project: linux
File: route.c

static int rt6_score_route(struct rt6_info *rt, int oif,
			   int strict)
{
	int m, n;

	m = rt6_check_dev(rt, oif);
	if (!m && (strict & RT6_LOOKUP_F_IFACE))
		return -1;
#ifdef CONFIG_IPV6_ROUTER_PREF
	m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
#endif
	n = rt6_check_neigh(rt);
	if (!n && (strict & RT6_LOOKUP_F_REACHABLE))
		return -1;
	return m;
}

Project: linux
File: route.c

int ip6_route_get_saddr(struct net *net,
			struct rt6_info *rt,
			const struct in6_addr *daddr,
			unsigned int prefs,
			struct in6_addr *saddr)
{
	struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
	int err = 0;
	if (rt->rt6i_prefsrc.plen)
		*saddr = rt->rt6i_prefsrc.addr;
	else
		err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
					 daddr, prefs, saddr);
	return err;
}

Project: linux
File: route.c

static bool rt6_check_expired(const struct rt6_info *rt)
{
	if (rt->rt6i_flags & RTF_EXPIRES) {
		if (time_after(jiffies, rt->dst.expires))
			return true;
	} else if (rt->dst.from) {
		return rt6_check_expired((struct rt6_info *) rt->dst.from);
	}
	return false;
}

Project: linux
File: route.c

static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
			   int how)
{
	struct rt6_info *rt = (struct rt6_info *)dst;
	struct inet6_dev *idev = rt->rt6i_idev;
	struct net_device *loopback_dev =
		dev_net(dev)->loopback_dev;

	if (dev != loopback_dev) {
		if (idev && idev->dev == dev) {
			struct inet6_dev *loopback_idev =
				in6_dev_get(loopback_dev);
			if (loopback_idev) {
				rt->rt6i_idev = loopback_idev;
				in6_dev_put(idev);
			}
		}
		if (rt->n && rt->n->dev == dev) {
			rt->n->dev = loopback_dev;
			dev_hold(loopback_dev);
			dev_put(dev);
		}
	}
}

Project: linux
File: route.c

static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
{
	int err;
	struct fib6_table *table;
	struct net *net = dev_net(rt->dst.dev);

	if (rt == net->ipv6.ip6_null_entry) {
		err = -ENOENT;
		goto out;
	}

	table = rt->rt6i_table;
	write_lock_bh(&table->tb6_lock);
	err = fib6_del(rt, info);
	write_unlock_bh(&table->tb6_lock);

out:
	dst_release(&rt->dst);
	return err;
}

Project: linux
File: route.c

static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
{
	struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
	struct inet6_dev *idev;

	/* In IPv6 pmtu discovery is not optional,
	   so that RTAX_MTU lock cannot disable it.
	   We still use this lock to block changes
	   caused by addrconf/ndisc.
	*/

	idev = __in6_dev_get(arg->dev);
	if (!idev)
		return 0;

	/* For administrative MTU increase, there is no way to discover
	   IPv6 PMTU increase, so PMTU increase should be updated here.
	   Since RFC 1981 doesn't include administrative MTU increase
	   update PMTU increase is a MUST. (i.e. jumbo frame)
	 */
	/*
	   If new MTU is less than route PMTU, this new MTU will be the
	   lowest MTU in the path, update the route PMTU to reflect PMTU
	   decreases; if new MTU is greater than route PMTU, and the
	   old MTU is the lowest MTU in the path, update the route PMTU
	   to reflect the increase. In this case if the other nodes' MTU
	   also have the lowest MTU, TOO BIG MESSAGE will be lead to
	   PMTU discouvery.
	 */
	if (rt->dst.dev == arg->dev &&
	    !dst_metric_locked(&rt->dst, RTAX_MTU) &&
	    (dst_mtu(&rt->dst) >= arg->mtu ||
	     (dst_mtu(&rt->dst) < arg->mtu &&
	      dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
		dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
	}
	return 0;
}

Project: linux
File: route.c

static int __net_init ipv6_inetpeer_init(struct net *net)
{
	struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);

	if (!bp)
		return -ENOMEM;
	inet_peer_base_init(bp);
	net->ipv6.peers = bp;
	return 0;
}

Project: linux
File: route.c

static void __net_exit ip6_route_net_exit_late(struct net *net)
{
#ifdef CONFIG_PROC_FS
	proc_net_remove(net, "ipv6_route");
	proc_net_remove(net, "rt6_stats");
#endif
}

Project: linux
File: route.c

void rt6_purge_dflt_routers(struct net *net)
{
	struct rt6_info *rt;
	struct fib6_table *table;

	/* NOTE: Keep consistent with rt6_get_dflt_router */
	table = fib6_get_table(net, RT6_TABLE_DFLT);
	if (!table)
		return;

restart:
	read_lock_bh(&table->tb6_lock);
	for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
			dst_hold(&rt->dst);
			read_unlock_bh(&table->tb6_lock);
			ip6_del_rt(rt);
			goto restart;
		}
	}
	read_unlock_bh(&table->tb6_lock);
}

Project: linux
File: route.c

static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
				   int *mpri, struct rt6_info *match)
{
	int m;

	if (rt6_check_expired(rt))
		goto out;

	m = rt6_score_route(rt, oif, strict);
	if (m < 0)
		goto out;

	if (m > *mpri) {
		if (strict & RT6_LOOKUP_F_REACHABLE)
			rt6_probe(match);
		*mpri = m;
		match = rt;
	} else if (strict & RT6_LOOKUP_F_REACHABLE) {
		rt6_probe(rt);
	}

out:
	return match;
}

Project: linux
File: route.c

static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
					    struct flowi6 *fl6, int flags)
{
	return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
}

Project: linux
File: route.c

static int ip6_pkt_prohibit(struct sk_buff *skb)
{
	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
}

Project: linux
File: route.c

struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
				     struct net_device *dev,
				     unsigned int pref)
{
	struct fib6_config cfg = {
		.fc_table	= RT6_TABLE_DFLT,
		.fc_metric	= IP6_RT_PRIO_USER,
		.fc_ifindex	= dev->ifindex,
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
				  RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
		.fc_nlinfo.portid = 0,
		.fc_nlinfo.nlh = NULL,
		.fc_nlinfo.nl_net = dev_net(dev),
	};

	cfg.fc_gateway = *gwaddr;

	ip6_route_add(&cfg);

	return rt6_get_dflt_router(gwaddr, dev);
}

Project: linux
File: route.c

static struct rt6_info *rt6_add_route_info(struct net *net,
					   const struct in6_addr *prefix, int prefixlen,
					   const struct in6_addr *gwaddr, int ifindex,
					   unsigned int pref)
{
	struct fib6_config cfg = {
		.fc_table	= RT6_TABLE_INFO,
		.fc_metric	= IP6_RT_PRIO_USER,
		.fc_ifindex	= ifindex,
		.fc_dst_len	= prefixlen,
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
				  RTF_UP | RTF_PREF(pref),
		.fc_nlinfo.portid = 0,
		.fc_nlinfo.nlh = NULL,
		.fc_nlinfo.nl_net = net,
	};

	cfg.fc_dst = *prefix;
	cfg.fc_gateway = *gwaddr;

	/* We should treat it as a default route if prefix length is 0. */
	if (!prefixlen)
		cfg.fc_flags |= RTF_DEFAULT;

	ip6_route_add(&cfg);

	return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
}

Project: linux
File: route.c

static inline struct rt6_info *rt6_device_match(struct net *net,
						    struct rt6_info *rt,
						    const struct in6_addr *saddr,
						    int oif,
						    int flags)
{
	struct rt6_info *local = NULL;
	struct rt6_info *sprt;

	if (!oif && ipv6_addr_any(saddr))
		goto out;

	for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
		struct net_device *dev = sprt->dst.dev;

		if (oif) {
			if (dev->ifindex == oif)
				return sprt;
			if (dev->flags & IFF_LOOPBACK) {
				if (!sprt->rt6i_idev ||
				    sprt->rt6i_idev->dev->ifindex != oif) {
					if (flags & RT6_LOOKUP_F_IFACE && oif)
						continue;
					if (local && (!oif ||
						      local->rt6i_idev->dev->ifindex == oif))
						continue;
				}
				local = sprt;
			}
		} else {
			if (ipv6_chk_addr(net, saddr, dev,
					  flags & RT6_LOOKUP_F_IFACE))
				return sprt;
		}
	}

	if (oif) {
		if (local)
			return local;

		if (flags & RT6_LOOKUP_F_IFACE)
			return net->ipv6.ip6_null_entry;
	}
out:
	return rt;
}

Project: linux
File: route.c

static int fib6_ifdown(struct rt6_info *rt, void *arg)
{
	const struct arg_dev_net *adn = arg;
	const struct net_device *dev = adn->dev;

	if ((rt->dst.dev == dev || !dev) &&
	    rt != adn->net->ipv6.ip6_null_entry)
		return -1;

	return 0;
}

Project: linux
File: route.c

static void rt6_probe(struct rt6_info *rt)
{
	struct neighbour *neigh;
	/*
	 * Okay, this does not seem to be appropriate
	 * for now, however, we need to check if it
	 * is really so; aka Router Reachability Probing.
	 *
	 * Router Reachability Probe MUST be rate-limited
	 * to no more than one per minute.
	 */
	neigh = rt ? rt->n : NULL;
	if (!neigh || (neigh->nud_state & NUD_VALID))
		return;
	read_lock_bh(&neigh->lock);
	if (!(neigh->nud_state & NUD_VALID) &&
	    time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
		struct in6_addr mcaddr;
		struct in6_addr *target;

		neigh->updated = jiffies;
		read_unlock_bh(&neigh->lock);

		target = (struct in6_addr *)&neigh->primary_key;
		addrconf_addr_solict_mult(target, &mcaddr);
		ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL);
	} else {
		read_unlock_bh(&neigh->lock);
	}
}

Project: linux
File: route.c

void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
{
	struct rt6_mtu_change_arg arg = {
		.dev = dev,
		.mtu = mtu,
	};

	fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
}

Project: linux
File: route.c

static int __net_init ip6_route_net_init(struct net *net)
{
	int ret = -ENOMEM;

	memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
	       sizeof(net->ipv6.ip6_dst_ops));

	if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
		goto out_ip6_dst_ops;

	net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
					   sizeof(*net->ipv6.ip6_null_entry),
					   GFP_KERNEL);
	if (!net->ipv6.ip6_null_entry)
		goto out_ip6_dst_entries;
	net->ipv6.ip6_null_entry->dst.path =
		(struct dst_entry *)net->ipv6.ip6_null_entry;
	net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
	dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
			 ip6_template_metrics, true);

#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
					       sizeof(*net->ipv6.ip6_prohibit_entry),
					       GFP_KERNEL);
	if (!net->ipv6.ip6_prohibit_entry)
		goto out_ip6_null_entry;
	net->ipv6.ip6_prohibit_entry->dst.path =
		(struct dst_entry *)net->ipv6.ip6_prohibit_entry;
	net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
	dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
			 ip6_template_metrics, true);

	net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
					       sizeof(*net->ipv6.ip6_blk_hole_entry),
					       GFP_KERNEL);
	if (!net->ipv6.ip6_blk_hole_entry)
		goto out_ip6_prohibit_entry;
	net->ipv6.ip6_blk_hole_entry->dst.path =
		(struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
	net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
	dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
			 ip6_template_metrics, true);
#endif

	net->ipv6.sysctl.flush_delay = 0;
	net->ipv6.sysctl.ip6_rt_max_size = 4096;
	net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
	net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
	net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
	net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
	net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
	net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;

	net->ipv6.ip6_rt_gc_expire = 30*HZ;

	ret = 0;
out:
	return ret;

#ifdef CONFIG_IPV6_MULTIPLE_TABLES
out_ip6_prohibit_entry:
	kfree(net->ipv6.ip6_prohibit_entry);
out_ip6_null_entry:
	kfree(net->ipv6.ip6_null_entry);
#endif
out_ip6_dst_entries:
	dst_entries_destroy(&net->ipv6.ip6_dst_ops);
out_ip6_dst_ops:
	goto out;
}

Project: linux
File: route.c

static unsigned int ip6_default_advmss(const struct dst_entry *dst)
{
	struct net_device *dev = dst->dev;
	unsigned int mtu = dst_mtu(dst);
	struct net *net = dev_net(dev);

	mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);

	if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
		mtu = net->ipv6.sysctl.ip6_rt_min_advmss;

	/*
	 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
	 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
	 * IPV6_MAXPLEN is also valid and means: "any MSS,
	 * rely only on pmtu discovery"
	 */
	if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
		mtu = IPV6_MAXPLEN;
	return mtu;
}

Project: linux
File: route.c

void ip6_route_input(struct sk_buff *skb)
{
	const struct ipv6hdr *iph = ipv6_hdr(skb);
	struct net *net = dev_net(skb->dev);
	int flags = RT6_LOOKUP_F_HAS_SADDR;
	struct flowi6 fl6 = {
		.flowi6_iif = skb->dev->ifindex,
		.daddr = iph->daddr,
		.saddr = iph->saddr,
		.flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK,
		.flowi6_mark = skb->mark,
		.flowi6_proto = iph->nexthdr,
	};

	skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
}

Project: linux
File: route.c

int rt6_dump_route(struct rt6_info *rt, void *p_arg)
{
	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
	int prefix;

	if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
		struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
		prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
	} else
		prefix = 0;

	return rt6_fill_node(arg->net,
		     arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
		     NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
		     prefix, 0, NLM_F_MULTI);
}

Project: linux
File: route.c

static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
					 struct sk_buff *skb, u32 mtu)
{
}

Project: linux
File: route.c

static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
{
	struct rt6_info *rt = (struct rt6_info *) dst;
	struct inet_peer *peer;
	u32 *p = NULL;

	if (!(rt->dst.flags & DST_HOST))
		return NULL;

	peer = rt6_get_peer_create(rt);
	if (peer) {
		u32 *old_p = __DST_METRICS_PTR(old);
		unsigned long prev, new;

		p = peer->metrics;
		if (inet_metrics_new(peer))
			memcpy(p, old_p, sizeof(u32) * RTAX_MAX);

		new = (unsigned long) p;
		prev = cmpxchg(&dst->_metrics, old, new);

		if (prev != old) {
			p = __DST_METRICS_PTR(prev);
			if (prev & DST_METRICS_READ_ONLY)
				p = NULL;
		}
	}
	return p;
}

Project: linux
File: route.c

int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
{
	struct fib6_config cfg;
	struct in6_rtmsg rtmsg;
	int err;

	switch(cmd) {
	case SIOCADDRT:		/* Add a route */
	case SIOCDELRT:		/* Delete a route */
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		err = copy_from_user(&rtmsg, arg,
				     sizeof(struct in6_rtmsg));
		if (err)
			return -EFAULT;

		rtmsg_to_fib6_config(net, &rtmsg, &cfg);

		rtnl_lock();
		switch (cmd) {
		case SIOCADDRT:
			err = ip6_route_add(&cfg);
			break;
		case SIOCDELRT:
			err = ip6_route_del(&cfg);
			break;
		default:
			err = -EINVAL;
		}
		rtnl_unlock();

		return err;
	}

	return -EINVAL;
}

Project: linux
File: route.c

static int ip6_pkt_discard_out(struct sk_buff *skb)
{
	skb->dev = skb_dst(skb)->dev;
	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
}

Project: linux
File: route.c

void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
{
	struct sk_buff *skb;
	struct net *net = info->nl_net;
	u32 seq;
	int err;

	err = -ENOBUFS;
	seq = info->nlh ? info->nlh->nlmsg_seq : 0;

	skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
	if (!skb)
		goto errout;

	err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
				event, info->portid, seq, 0, 0, 0);
	if (err < 0) {
		/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
	rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
		    info->nlh, gfp_any());
	return;
errout:
	if (err < 0)
		rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
}

Project: linux
File: route.c

static int ip6_pkt_discard(struct sk_buff *skb)
{
	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
}

Project: linux
File: route.c

int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
		  const struct in6_addr *gwaddr)
{
	struct net *net = dev_net(dev);
	struct route_info *rinfo = (struct route_info *) opt;
	struct in6_addr prefix_buf, *prefix;
	unsigned int pref;
	unsigned long lifetime;
	struct rt6_info *rt;

	if (len < sizeof(struct route_info)) {
		return -EINVAL;
	}

	/* Sanity check for prefix_len and length */
	if (rinfo->length > 3) {
		return -EINVAL;
	} else if (rinfo->prefix_len > 128) {
		return -EINVAL;
	} else if (rinfo->prefix_len > 64) {
		if (rinfo->length < 2) {
			return -EINVAL;
		}
	} else if (rinfo->prefix_len > 0) {
		if (rinfo->length < 1) {
			return -EINVAL;
		}
	}

	pref = rinfo->route_pref;
	if (pref == ICMPV6_ROUTER_PREF_INVALID)
		return -EINVAL;

	lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);

	if (rinfo->length == 3)
		prefix = (struct in6_addr *)rinfo->prefix;
	else {
		/* this function is safe */
		ipv6_addr_prefix(&prefix_buf,
				 (struct in6_addr *)rinfo->prefix,
				 rinfo->prefix_len);
		prefix = &prefix_buf;
	}

	rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
				dev->ifindex);

	if (rt && !lifetime) {
		ip6_del_rt(rt);
		rt = NULL;
	}

	if (!rt && lifetime)
		rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
					pref);
	else if (rt)
		rt->rt6i_flags = RTF_ROUTEINFO |
				 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);

	if (rt) {
		if (!addrconf_finite_timeout(lifetime))
			rt6_clean_expires(rt);
		else
			rt6_set_expires(rt, jiffies + HZ * lifetime);

		dst_release(&rt->dst);
	}
	return 0;
}

Project: linux
File: route.c

static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
					     struct flowi6 *fl6, int flags)
{
	return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
}

Project: linux
File: route.c

static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
				    const struct in6_addr *dest)
{
	struct net *net = dev_net(ort->dst.dev);
	struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
					    ort->rt6i_table);

	if (rt) {
		rt->dst.input = ort->dst.input;
		rt->dst.output = ort->dst.output;
		rt->dst.flags |= DST_HOST;

		rt->rt6i_dst.addr = *dest;
		rt->rt6i_dst.plen = 128;
		dst_copy_metrics(&rt->dst, &ort->dst);
		rt->dst.error = ort->dst.error;
		rt->rt6i_idev = ort->rt6i_idev;
		if (rt->rt6i_idev)
			in6_dev_hold(rt->rt6i_idev);
		rt->dst.lastuse = jiffies;

		rt->rt6i_gateway = ort->rt6i_gateway;
		rt->rt6i_flags = ort->rt6i_flags;
		if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==
		    (RTF_DEFAULT | RTF_ADDRCONF))
			rt6_set_from(rt, ort);
		else
			rt6_clean_expires(rt);
		rt->rt6i_metric = 0;

#ifdef CONFIG_IPV6_SUBTREES
		memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
#endif
		memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
		rt->rt6i_table = ort->rt6i_table;
	}
	return rt;
}

Project: linux
File: route.c

static void ip6_link_failure(struct sk_buff *skb)
{
	struct rt6_info *rt;

	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);

	rt = (struct rt6_info *) skb_dst(skb);
	if (rt) {
		if (rt->rt6i_flags & RTF_CACHE)
			rt6_update_expires(rt, 0);
		else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
			rt->rt6i_node->fn_sernum = -1;
	}
}

Project: linux
File: route.c

static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
					const struct in6_addr *daddr)
{
	struct rt6_info *rt = ip6_rt_copy(ort, daddr);

	if (rt) {
		rt->rt6i_flags |= RTF_CACHE;
		rt->n = neigh_clone(ort->n);
	}
	return rt;
}

Project: linux
File: route.c

static void __net_exit ip6_route_net_exit(struct net *net)
{
	kfree(net->ipv6.ip6_null_entry);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	kfree(net->ipv6.ip6_prohibit_entry);
	kfree(net->ipv6.ip6_blk_hole_entry);
#endif
	dst_entries_destroy(&net->ipv6.ip6_dst_ops);
}

Project: linux
File: route.c

void rt6_bind_peer(struct rt6_info *rt, int create)
{
	struct inet_peer_base *base;
	struct inet_peer *peer;

	base = inetpeer_base_ptr(rt->_rt6i_peer);
	if (!base)
		return;

	peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
	if (peer) {
		if (!rt6_set_peer(rt, peer))
			inet_putpeer(peer);
		else
			rt->rt6i_peer_genid = rt6_peer_genid();
	}
}

Project: linux
File: route.c

static void ip6_dst_destroy(struct dst_entry *dst)
{
	struct rt6_info *rt = (struct rt6_info *)dst;
	struct inet6_dev *idev = rt->rt6i_idev;

	if (rt->n)
		neigh_release(rt->n);

	if (!(rt->dst.flags & DST_HOST))
		dst_destroy_metrics_generic(dst);

	if (idev) {
		rt->rt6i_idev = NULL;
		in6_dev_put(idev);
	}

	if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from)
		dst_release(dst->from);

	if (rt6_has_peer(rt)) {
		struct inet_peer *peer = rt6_peer_ptr(rt);
		inet_putpeer(peer);
	}
}

Project: linux
File: route.c

static inline const void *choose_neigh_daddr(struct rt6_info *rt,
					     struct sk_buff *skb,
					     const void *daddr)
{
	struct in6_addr *p = &rt->rt6i_gateway;

	if (!ipv6_addr_any(p))
		return (const void *) p;
	else if (skb)
		return &ipv6_hdr(skb)->daddr;
	return daddr;
}

Project: linux
File: route.c

static int rt6_fill_node(struct net *net,
			 struct sk_buff *skb, struct rt6_info *rt,
			 struct in6_addr *dst, struct in6_addr *src,
			 int iif, int type, u32 portid, u32 seq,
			 int prefix, int nowait, unsigned int flags)
{
	struct rtmsg *rtm;
	struct nlmsghdr *nlh;
	long expires;
	u32 table;
	struct neighbour *n;

	if (prefix) {	/* user wants prefix routes only */
		if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
			/* success since this is not a prefix route */
			return 1;
		}
	}

	nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
	if (!nlh)
		return -EMSGSIZE;

	rtm = nlmsg_data(nlh);
	rtm->rtm_family = AF_INET6;
	rtm->rtm_dst_len = rt->rt6i_dst.plen;
	rtm->rtm_src_len = rt->rt6i_src.plen;
	rtm->rtm_tos = 0;
	if (rt->rt6i_table)
		table = rt->rt6i_table->tb6_id;
	else
		table = RT6_TABLE_UNSPEC;
	rtm->rtm_table = table;
	if (nla_put_u32(skb, RTA_TABLE, table))
		goto nla_put_failure;
	if (rt->rt6i_flags & RTF_REJECT) {
		switch (rt->dst.error) {
		case -EINVAL:
			rtm->rtm_type = RTN_BLACKHOLE;
			break;
		case -EACCES:
			rtm->rtm_type = RTN_PROHIBIT;
			break;
		case -EAGAIN:
			rtm->rtm_type = RTN_THROW;
			break;
		default:
			rtm->rtm_type = RTN_UNREACHABLE;
			break;
		}
	}
	else if (rt->rt6i_flags & RTF_LOCAL)
		rtm->rtm_type = RTN_LOCAL;
	else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
		rtm->rtm_type = RTN_LOCAL;
	else
		rtm->rtm_type = RTN_UNICAST;
	rtm->rtm_flags = 0;
	rtm->rtm_scope = RT_SCOPE_UNIVERSE;
	rtm->rtm_protocol = rt->rt6i_protocol;
	if (rt->rt6i_flags & RTF_DYNAMIC)
		rtm->rtm_protocol = RTPROT_REDIRECT;
	else if (rt->rt6i_flags & RTF_ADDRCONF) {
		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
			rtm->rtm_protocol = RTPROT_RA;
		else
			rtm->rtm_protocol = RTPROT_KERNEL;
	}

	if (rt->rt6i_flags & RTF_CACHE)
		rtm->rtm_flags |= RTM_F_CLONED;

	if (dst) {
		if (nla_put(skb, RTA_DST, 16, dst))
			goto nla_put_failure;
		rtm->rtm_dst_len = 128;
	} else if (rtm->rtm_dst_len)
		if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
			goto nla_put_failure;
#ifdef CONFIG_IPV6_SUBTREES
	if (src) {
		if (nla_put(skb, RTA_SRC, 16, src))
			goto nla_put_failure;
		rtm->rtm_src_len = 128;
	} else if (rtm->rtm_src_len &&
		   nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
		goto nla_put_failure;
#endif
	if (iif) {
#ifdef CONFIG_IPV6_MROUTE
		if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
			int err = ip6mr_get_route(net, skb, rtm, nowait);
			if (err <= 0) {
				if (!nowait) {
					if (err == 0)
						return 0;
					goto nla_put_failure;
				} else {
					if (err == -EMSGSIZE)
						goto nla_put_failure;
				}
			}
		} else
#endif
			if (nla_put_u32(skb, RTA_IIF, iif))
				goto nla_put_failure;
	} else if (dst) {
		struct in6_addr saddr_buf;
		if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
		    nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
			goto nla_put_failure;
	}

	if (rt->rt6i_prefsrc.plen) {
		struct in6_addr saddr_buf;
		saddr_buf = rt->rt6i_prefsrc.addr;
		if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
			goto nla_put_failure;
	}

	if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
		goto nla_put_failure;

	n = rt->n;
	if (n) {
		if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0)
			goto nla_put_failure;
	}

	if (rt->dst.dev &&
	    nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
		goto nla_put_failure;
	if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
		goto nla_put_failure;

	expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;

	if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
		goto nla_put_failure;

	return nlmsg_end(skb, nlh);

nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

Project: linux
File: route.c

static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
				      struct sk_buff *skb)
{
}

Project: linux
File: route.c

static void __net_exit ipv6_inetpeer_exit(struct net *net)
{
	struct inet_peer_base *bp = net->ipv6.peers;

	net->ipv6.peers = NULL;
	inetpeer_invalidate_tree(bp);
	kfree(bp);
}

Project: linux
File: route.c

static int ipv6_route_open(struct inode *inode, struct file *file)
{
	return single_open_net(inode, file, ipv6_route_show);
}

Project: linux
File: route.c

static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
{
	struct net *net = dev_net(skb->dev);
	struct netevent_redirect netevent;
	struct rt6_info *rt, *nrt = NULL;
	const struct in6_addr *target;
	struct ndisc_options ndopts;
	const struct in6_addr *dest;
	struct neighbour *old_neigh;
	struct inet6_dev *in6_dev;
	struct neighbour *neigh;
	struct icmp6hdr *icmph;
	int optlen, on_link;
	u8 *lladdr;

	optlen = skb->tail - skb->transport_header;
	optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);

	if (optlen < 0) {
		net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
		return;
	}

	icmph = icmp6_hdr(skb);
	target = (const struct in6_addr *) (icmph + 1);
	dest = target + 1;

	if (ipv6_addr_is_multicast(dest)) {
		net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
		return;
	}

	on_link = 0;
	if (ipv6_addr_equal(dest, target)) {
		on_link = 1;
	} else if (ipv6_addr_type(target) !=
		   (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
		net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
		return;
	}

	in6_dev = __in6_dev_get(skb->dev);
	if (!in6_dev)
		return;
	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
		return;

	/* RFC2461 8.1:
	 *	The IP source address of the Redirect MUST be the same as the current
	 *	first-hop router for the specified ICMP Destination Address.
	 */

	if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
		net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
		return;
	}

	lladdr = NULL;
	if (ndopts.nd_opts_tgt_lladdr) {
		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
					     skb->dev);
		if (!lladdr) {
			net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
			return;
		}
	}

	rt = (struct rt6_info *) dst;
	if (rt == net->ipv6.ip6_null_entry) {
		net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
		return;
	}

	/* Redirect received -> path was valid.
	 * Look, redirects are sent only in response to data packets,
	 * so that this nexthop apparently is reachable. --ANK
	 */
	dst_confirm(&rt->dst);

	neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
	if (!neigh)
		return;

	/* Duplicate redirect: silently ignore. */
	old_neigh = rt->n;
	if (neigh == old_neigh)
		goto out;

	/*
	 *	We have finally decided to accept it.
	 */

	neigh_update(neigh, lladdr, NUD_STALE,
		     NEIGH_UPDATE_F_WEAK_OVERRIDE|
		     NEIGH_UPDATE_F_OVERRIDE|
		     (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
				     NEIGH_UPDATE_F_ISROUTER))
		     );

	nrt = ip6_rt_copy(rt, dest);
	if (!nrt)
		goto out;

	nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
	if (on_link)
		nrt->rt6i_flags &= ~RTF_GATEWAY;

	nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
	nrt->n = neigh_clone(neigh);

	if (ip6_ins_rt(nrt))
		goto out;

	netevent.old = &rt->dst;
	netevent.old_neigh = old_neigh;
	netevent.new = &nrt->dst;
	netevent.new_neigh = neigh;
	netevent.daddr = dest;
	call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);

	if (rt->rt6i_flags & RTF_CACHE) {
		rt = (struct rt6_info *) dst_clone(&rt->dst);
		ip6_del_rt(rt);
	}

out:
	neigh_release(neigh);
}

Project: linux
File: route.c

static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
{
	int type;
	struct dst_entry *dst = skb_dst(skb);
	switch (ipstats_mib_noroutes) {
	case IPSTATS_MIB_INNOROUTES:
		type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
		if (type == IPV6_ADDR_ANY) {
			IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
				      IPSTATS_MIB_INADDRERRORS);
			break;
		}
		/* FALLTHROUGH */
	case IPSTATS_MIB_OUTNOROUTES:
		IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
			      ipstats_mib_noroutes);
		break;
	}
	icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
	kfree_skb(skb);
	return 0;
}

Project: linux
File: route.c

int ip6_del_rt(struct rt6_info *rt)
{
	struct nl_info info = {
		.nl_net = dev_net(rt->dst.dev),
	};
	return __ip6_del_rt(rt, &info);
}

Project: linux
File: ip6_fib.c

void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
		    int prune, void *arg)
{
	struct fib6_table *table;
	struct hlist_node *node;
	struct hlist_head *head;
	unsigned int h;

	rcu_read_lock();
	for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
		head = &net->ipv6.fib_table_hash[h];
		hlist_for_each_entry_rcu(table, node, head, tb6_hlist) {
			write_lock_bh(&table->tb6_lock);
			fib6_clean_tree(net, &table->tb6_root,
					func, prune, arg);
			write_unlock_bh(&table->tb6_lock);
		}
	}
	rcu_read_unlock();
}

Project: linux
File: route.c

void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
{
	ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
}

Project: linux
File: route.c

static int ipv6_route_show(struct seq_file *m, void *v)
{
	struct net *net = (struct net *)m->private;
	fib6_clean_all_ro(net, rt6_info_route, 0, m);
	return 0;
}

Project: linux
File: route.c

static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
{
	struct net *net = sock_net(in_skb->sk);
	struct nlattr *tb[RTA_MAX+1];
	struct rt6_info *rt;
	struct sk_buff *skb;
	struct rtmsg *rtm;
	struct flowi6 fl6;
	int err, iif = 0, oif = 0;

	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
	if (err < 0)
		goto errout;

	err = -EINVAL;
	memset(&fl6, 0, sizeof(fl6));

	if (tb[RTA_SRC]) {
		if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
			goto errout;

		fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
	}

	if (tb[RTA_DST]) {
		if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
			goto errout;

		fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
	}

	if (tb[RTA_IIF])
		iif = nla_get_u32(tb[RTA_IIF]);

	if (tb[RTA_OIF])
		oif = nla_get_u32(tb[RTA_OIF]);

	if (iif) {
		struct net_device *dev;
		int flags = 0;

		dev = __dev_get_by_index(net, iif);
		if (!dev) {
			err = -ENODEV;
			goto errout;
		}

		fl6.flowi6_iif = iif;

		if (!ipv6_addr_any(&fl6.saddr))
			flags |= RT6_LOOKUP_F_HAS_SADDR;

		rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
							       flags);
	} else {
		fl6.flowi6_oif = oif;

		rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
	}

	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb) {
		dst_release(&rt->dst);
		err = -ENOBUFS;
		goto errout;
	}

	/* Reserve room for dummy headers, this skb can pass
	   through good chunk of routing engine.
	 */
	skb_reset_mac_header(skb);
	skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));

	skb_dst_set(skb, &rt->dst);

	err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
			    RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
			    nlh->nlmsg_seq, 0, 0, 0);
	if (err < 0) {
		kfree_skb(skb);
		goto errout;
	}

	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
errout:
	return err;
}

Project: linux
File: route.c

static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
					     struct flowi6 *fl6)
{
	struct rt6_info *sibling, *next_sibling;
	int route_choosen;

	route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
	/* Don't change the route, if route_choosen == 0
	 * (siblings does not include ourself)
	 */
	if (route_choosen)
		list_for_each_entry_safe(sibling, next_sibling,
				&match->rt6i_siblings, rt6i_siblings) {
			route_choosen--;
			if (route_choosen == 0) {
				match = sibling;
				break;
			}
		}
	return match;
}

Project: linux
File: ip6_fib.c

void fib6_gc_cleanup(void)
{
	unregister_pernet_subsys(&fib6_net_ops);
	kmem_cache_destroy(fib6_node_kmem);
}

Project: linux
File: ip6_fib.c

static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct net *net = sock_net(skb->sk);
	unsigned int h, s_h;
	unsigned int e = 0, s_e;
	struct rt6_rtnl_dump_arg arg;
	struct fib6_walker_t *w;
	struct fib6_table *tb;
	struct hlist_node *node;
	struct hlist_head *head;
	int res = 0;

	s_h = cb->args[0];
	s_e = cb->args[1];

	w = (void *)cb->args[2];
	if (!w) {
		/* New dump:
		 *
		 * 1. hook callback destructor.
		 */
		cb->args[3] = (long)cb->done;
		cb->done = fib6_dump_done;

		/*
		 * 2. allocate and initialize walker.
		 */
		w = kzalloc(sizeof(*w), GFP_ATOMIC);
		if (!w)
			return -ENOMEM;
		w->func = fib6_dump_node;
		cb->args[2] = (long)w;
	}

	arg.skb = skb;
	arg.cb = cb;
	arg.net = net;
	w->args = &arg;

	rcu_read_lock();
	for (h = s_h; h < FIB6_TABLE_HASHSZ; h++, s_e = 0) {
		e = 0;
		head = &net->ipv6.fib_table_hash[h];
		hlist_for_each_entry_rcu(tb, node, head, tb6_hlist) {
			if (e < s_e)
				goto next;
			res = fib6_dump_table(tb, skb, cb);
			if (res != 0)
				goto out;
next:
			e++;
		}
	}
out:
	rcu_read_unlock();
	cb->args[1] = e;
	cb->args[0] = h;

	res = res < 0 ? res : skb->len;
	if (res <= 0)
		fib6_dump_end(cb);
	return res;
}

Project: linux
File: route.c

int ip6_route_add(struct fib6_config *cfg)
{
	int err;
	struct net *net = cfg->fc_nlinfo.nl_net;
	struct rt6_info *rt = NULL;
	struct net_device *dev = NULL;
	struct inet6_dev *idev = NULL;
	struct fib6_table *table;
	int addr_type;

	if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
		return -EINVAL;
#ifndef CONFIG_IPV6_SUBTREES
	if (cfg->fc_src_len)
		return -EINVAL;
#endif
	if (cfg->fc_ifindex) {
		err = -ENODEV;
		dev = dev_get_by_index(net, cfg->fc_ifindex);
		if (!dev)
			goto out;
		idev = in6_dev_get(dev);
		if (!idev)
			goto out;
	}

	if (cfg->fc_metric == 0)
		cfg->fc_metric = IP6_RT_PRIO_USER;

	err = -ENOBUFS;
	if (cfg->fc_nlinfo.nlh &&
	    !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
		table = fib6_get_table(net, cfg->fc_table);
		if (!table) {
			pr_warn("NLM_F_CREATE should be specified when creating new route\n");
			table = fib6_new_table(net, cfg->fc_table);
		}
	} else {
		table = fib6_new_table(net, cfg->fc_table);
	}

	if (!table)
		goto out;

	rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table);

	if (!rt) {
		err = -ENOMEM;
		goto out;
	}

	if (cfg->fc_flags & RTF_EXPIRES)
		rt6_set_expires(rt, jiffies +
				clock_t_to_jiffies(cfg->fc_expires));
	else
		rt6_clean_expires(rt);

	if (cfg->fc_protocol == RTPROT_UNSPEC)
		cfg->fc_protocol = RTPROT_BOOT;
	rt->rt6i_protocol = cfg->fc_protocol;

	addr_type = ipv6_addr_type(&cfg->fc_dst);

	if (addr_type & IPV6_ADDR_MULTICAST)
		rt->dst.input = ip6_mc_input;
	else if (cfg->fc_flags & RTF_LOCAL)
		rt->dst.input = ip6_input;
	else
		rt->dst.input = ip6_forward;

	rt->dst.output = ip6_output;

	ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
	rt->rt6i_dst.plen = cfg->fc_dst_len;
	if (rt->rt6i_dst.plen == 128)
	       rt->dst.flags |= DST_HOST;

	if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
		u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
		if (!metrics) {
			err = -ENOMEM;
			goto out;
		}
		dst_init_metrics(&rt->dst, metrics, 0);
	}
#ifdef CONFIG_IPV6_SUBTREES
	ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
	rt->rt6i_src.plen = cfg->fc_src_len;
#endif

	rt->rt6i_metric = cfg->fc_metric;

	/* We cannot add true routes via loopback here,
	   they would result in kernel looping; promote them to reject routes
	 */
	if ((cfg->fc_flags & RTF_REJECT) ||
	    (dev && (dev->flags & IFF_LOOPBACK) &&
	     !(addr_type & IPV6_ADDR_LOOPBACK) &&
	     !(cfg->fc_flags & RTF_LOCAL))) {
		/* hold loopback dev/idev if we haven't done so. */
		if (dev != net->loopback_dev) {
			if (dev) {
				dev_put(dev);
				in6_dev_put(idev);
			}
			dev = net->loopback_dev;
			dev_hold(dev);
			idev = in6_dev_get(dev);
			if (!idev) {
				err = -ENODEV;
				goto out;
			}
		}
		rt->dst.output = ip6_pkt_discard_out;
		rt->dst.input = ip6_pkt_discard;
		rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
		switch (cfg->fc_type) {
		case RTN_BLACKHOLE:
			rt->dst.error = -EINVAL;
			break;
		case RTN_PROHIBIT:
			rt->dst.error = -EACCES;
			break;
		case RTN_THROW:
			rt->dst.error = -EAGAIN;
			break;
		default:
			rt->dst.error = -ENETUNREACH;
			break;
		}
		goto install_route;
	}

	if (cfg->fc_flags & RTF_GATEWAY) {
		const struct in6_addr *gw_addr;
		int gwa_type;

		gw_addr = &cfg->fc_gateway;
		rt->rt6i_gateway = *gw_addr;
		gwa_type = ipv6_addr_type(gw_addr);

		if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
			struct rt6_info *grt;

			/* IPv6 strictly inhibits using not link-local
			   addresses as nexthop address.
			   Otherwise, router will not able to send redirects.
			   It is very good, but in some (rare!) circumstances
			   (SIT, PtP, NBMA NOARP links) it is handy to allow
			   some exceptions. --ANK
			 */
			err = -EINVAL;
			if (!(gwa_type & IPV6_ADDR_UNICAST))
				goto out;

			grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);

			err = -EHOSTUNREACH;
			if (!grt)
				goto out;
			if (dev) {
				if (dev != grt->dst.dev) {
					dst_release(&grt->dst);
					goto out;
				}
			} else {
				dev = grt->dst.dev;
				idev = grt->rt6i_idev;
				dev_hold(dev);
				in6_dev_hold(grt->rt6i_idev);
			}
			if (!(grt->rt6i_flags & RTF_GATEWAY))
				err = 0;
			dst_release(&grt->dst);

			if (err)
				goto out;
		}
		err = -EINVAL;
		if (!dev || (dev->flags & IFF_LOOPBACK))
			goto out;
	}

	err = -ENODEV;
	if (!dev)
		goto out;

	if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
		if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
			err = -EINVAL;
			goto out;
		}
		rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
		rt->rt6i_prefsrc.plen = 128;
	} else
		rt->rt6i_prefsrc.plen = 0;

	if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
		err = rt6_bind_neighbour(rt, dev);
		if (err)
			goto out;
	}

	rt->rt6i_flags = cfg->fc_flags;

install_route:
	if (cfg->fc_mx) {
		struct nlattr *nla;
		int remaining;

		nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
			int type = nla_type(nla);

			if (type) {
				if (type > RTAX_MAX) {
					err = -EINVAL;
					goto out;
				}

				dst_metric_set(&rt->dst, type, nla_get_u32(nla));
			}
		}
	}

	rt->dst.dev = dev;
	rt->rt6i_idev = idev;
	rt->rt6i_table = table;

	cfg->fc_nlinfo.nl_net = dev_net(dev);

	return __ip6_ins_rt(rt, &cfg->fc_nlinfo);

out:
	if (dev)
		dev_put(dev);
	if (idev)
		in6_dev_put(idev);
	if (rt)
		dst_free(&rt->dst);
	return err;
}

Project: linux
File: ip6_fib.c

static struct fib6_node *fib6_repair_tree(struct net *net,
					   struct fib6_node *fn)
{
	int children;
	int nstate;
	struct fib6_node *child, *pn;
	struct fib6_walker_t *w;
	int iter = 0;

	for (;;) {
		RT6_TRACE("fixing tree: plen=%d iter=%d\n", fn->fn_bit, iter);
		iter++;

		WARN_ON(fn->fn_flags & RTN_RTINFO);
		WARN_ON(fn->fn_flags & RTN_TL_ROOT);
		WARN_ON(fn->leaf != NULL);

		children = 0;
		child = NULL;
		if (fn->right) child = fn->right, children |= 1;
		if (fn->left) child = fn->left, children |= 2;

		if (children == 3 || FIB6_SUBTREE(fn)
#ifdef CONFIG_IPV6_SUBTREES
		    /* Subtree root (i.e. fn) may have one child */
		    || (children && fn->fn_flags & RTN_ROOT)
#endif
		    ) {
			fn->leaf = fib6_find_prefix(net, fn);
#if RT6_DEBUG >= 2
			if (!fn->leaf) {
				WARN_ON(!fn->leaf);
				fn->leaf = net->ipv6.ip6_null_entry;
			}
#endif
			atomic_inc(&fn->leaf->rt6i_ref);
			return fn->parent;
		}

		pn = fn->parent;
#ifdef CONFIG_IPV6_SUBTREES
		if (FIB6_SUBTREE(pn) == fn) {
			WARN_ON(!(fn->fn_flags & RTN_ROOT));
			FIB6_SUBTREE(pn) = NULL;
			nstate = FWS_L;
		} else {
			WARN_ON(fn->fn_flags & RTN_ROOT);
#endif
			if (pn->right == fn) pn->right = child;
			else if (pn->left == fn) pn->left = child;
#if RT6_DEBUG >= 2
			else
				WARN_ON(1);
#endif
			if (child)
				child->parent = pn;
			nstate = FWS_R;
#ifdef CONFIG_IPV6_SUBTREES
		}
#endif

		read_lock(&fib6_walker_lock);
		FOR_WALKERS(w) {
			if (!child) {
				if (w->root == fn) {
					w->root = w->node = NULL;
					RT6_TRACE("W %p adjusted by delroot 1\n", w);
				} else if (w->node == fn) {
					RT6_TRACE("W %p adjusted by delnode 1, s=%d/%d\n", w, w->state, nstate);
					w->node = pn;
					w->state = nstate;
				}
			} else {
				if (w->root == fn) {
					w->root = child;
					RT6_TRACE("W %p adjusted by delroot 2\n", w);
				}
				if (w->node == fn) {
					w->node = child;
					if (children&2) {
						RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state);
						w->state = w->state>=FWS_R ? FWS_U : FWS_INIT;
					} else {
						RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state);
						w->state = w->state>=FWS_C ? FWS_U : FWS_INIT;
					}
				}
			}
		}
		read_unlock(&fib6_walker_lock);

		node_free(fn);
		if (pn->fn_flags & RTN_RTINFO || FIB6_SUBTREE(pn))
			return pn;

		rt6_release(pn->leaf);
		pn->leaf = NULL;
		fn = pn;
	}
}

Project: linux
File: route.c

void ip6_route_cleanup(void)
{
	unregister_netdevice_notifier(&ip6_route_dev_notifier);
	unregister_pernet_subsys(&ip6_route_net_late_ops);
	fib6_rules_cleanup();
	xfrm6_fini();
	fib6_gc_cleanup();
	unregister_pernet_subsys(&ipv6_inetpeer_ops);
	unregister_pernet_subsys(&ip6_route_net_ops);
	dst_entries_destroy(&ip6_dst_blackhole_ops);
	kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
}

Project: linux
File: route.c

int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write,
			      void __user *buffer, size_t *lenp, loff_t *ppos)
{
	struct net *net;
	int delay;
	if (!write)
		return -EINVAL;

	net = (struct net *)ctl->extra1;
	delay = net->ipv6.sysctl.flush_delay;
	proc_dointvec(ctl, write, buffer, lenp, ppos);
	fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
	return 0;
}

Project: linux
File: route.c

static int ip6_dst_gc(struct dst_ops *ops)
{
	unsigned long now = jiffies;
	struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
	int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
	int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
	int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
	int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
	unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
	int entries;

	entries = dst_entries_get_fast(ops);
	if (time_after(rt_last_gc + rt_min_interval, now) &&
	    entries <= rt_max_size)
		goto out;

	net->ipv6.ip6_rt_gc_expire++;
	fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
	net->ipv6.ip6_rt_last_gc = now;
	entries = dst_entries_get_slow(ops);
	if (entries < ops->gc_thresh)
		net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
out:
	net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
	return entries > rt_max_size;
}

Project: linux
File: route.c

static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
{
	struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
	struct net *net = ((struct arg_dev_net_ip *)arg)->net;
	struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;

	if (((void *)rt->dst.dev == dev || !dev) &&
	    rt != net->ipv6.ip6_null_entry &&
	    ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
		/* remove prefsrc entry */
		rt->rt6i_prefsrc.plen = 0;
	}
	return 0;
}

Project: linux
File: route.c

static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
	struct fib6_config cfg;
	int err;

	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	if (cfg.fc_mp)
		return ip6_route_multipath(&cfg, 0);
	else
		return ip6_route_del(&cfg);
}

Project: linux
File: route.c

static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
				     struct rt6_info *rr_head,
				     u32 metric, int oif, int strict)
{
	struct rt6_info *rt, *match;
	int mpri = -1;

	match = NULL;
	for (rt = rr_head; rt && rt->rt6i_metric == metric;
	     rt = rt->dst.rt6_next)
		match = find_match(rt, oif, strict, &mpri, match);
	for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
	     rt = rt->dst.rt6_next)
		match = find_match(rt, oif, strict, &mpri, match);

	return match;
}

Project: linux
File: route.c

struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
				    struct flowi6 *fl6)
{
	int flags = 0;

	fl6->flowi6_iif = LOOPBACK_IFINDEX;

	if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
		flags |= RT6_LOOKUP_F_IFACE;

	if (!ipv6_addr_any(&fl6->saddr))
		flags |= RT6_LOOKUP_F_HAS_SADDR;
	else if (sk)
		flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);

	return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
}

Project: linux
File: route.c

int __init ip6_route_init(void)
{
	int ret;

	ret = -ENOMEM;
	ip6_dst_ops_template.kmem_cachep =
		kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
				  SLAB_HWCACHE_ALIGN, NULL);
	if (!ip6_dst_ops_template.kmem_cachep)
		goto out;

	ret = dst_entries_init(&ip6_dst_blackhole_ops);
	if (ret)
		goto out_kmem_cache;

	ret = register_pernet_subsys(&ipv6_inetpeer_ops);
	if (ret)
		goto out_dst_entries;

	ret = register_pernet_subsys(&ip6_route_net_ops);
	if (ret)
		goto out_register_inetpeer;

	ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;

	/* Registering of the loopback is done before this portion of code,
	 * the loopback reference in rt6_info will not be taken, do it
	 * manually for init_net */
	init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
	init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
  #ifdef CONFIG_IPV6_MULTIPLE_TABLES
	init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
	init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
	init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
	init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
  #endif
	ret = fib6_init();
	if (ret)
		goto out_register_subsys;

	ret = xfrm6_init();
	if (ret)
		goto out_fib6_init;

	ret = fib6_rules_init();
	if (ret)
		goto xfrm6_init;

	ret = register_pernet_subsys(&ip6_route_net_late_ops);
	if (ret)
		goto fib6_rules_init;

	ret = -ENOBUFS;
	if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
	    __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
	    __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
		goto out_register_late_subsys;

	ret = register_netdevice_notifier(&ip6_route_dev_notifier);
	if (ret)
		goto out_register_late_subsys;

out:
	return ret;

out_register_late_subsys:
	unregister_pernet_subsys(&ip6_route_net_late_ops);
fib6_rules_init:
	fib6_rules_cleanup();
xfrm6_init:
	xfrm6_fini();
out_fib6_init:
	fib6_gc_cleanup();
out_register_subsys:
	unregister_pernet_subsys(&ip6_route_net_ops);
out_register_inetpeer:
	unregister_pernet_subsys(&ipv6_inetpeer_ops);
out_dst_entries:
	dst_entries_destroy(&ip6_dst_blackhole_ops);
out_kmem_cache:
	kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
	goto out;
}

Project: linux
File: route.c

static unsigned int ip6_mtu(const struct dst_entry *dst)
{
	struct inet6_dev *idev;
	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);

	if (mtu)
		return mtu;

	mtu = IPV6_MIN_MTU;

	rcu_read_lock();
	idev = __in6_dev_get(dst->dev);
	if (idev)
		mtu = idev->cnf.mtu6;
	rcu_read_unlock();

	return mtu;
}

Project: linux
File: route.c

static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
					  struct sk_buff *skb,
					  const void *daddr)
{
	struct rt6_info *rt = (struct rt6_info *) dst;
	struct neighbour *n;

	daddr = choose_neigh_daddr(rt, skb, daddr);
	n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr);
	if (n)
		return n;
	return neigh_create(&nd_tbl, daddr, dst->dev);
}

Project: linux
File: route.c

int icmp6_dst_gc(void)
{
	struct dst_entry *dst, **pprev;
	int more = 0;

	spin_lock_bh(&icmp6_dst_lock);
	pprev = &icmp6_dst_gc_list;

	while ((dst = *pprev) != NULL) {
		if (!atomic_read(&dst->__refcnt)) {
			*pprev = dst->next;
			dst_free(dst);
		} else {
			pprev = &dst->next;
			++more;
		}
	}

	spin_unlock_bh(&icmp6_dst_lock);

	return more;
}

Project: linux
File: route.c

static int rt6_stats_seq_open(struct inode *inode, struct file *file)
{
	return single_open_net(inode, file, rt6_stats_seq_show);
}

Project: linux
File: route.c

static int ip6_route_del(struct fib6_config *cfg)
{
	struct fib6_table *table;
	struct fib6_node *fn;
	struct rt6_info *rt;
	int err = -ESRCH;

	table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
	if (!table)
		return err;

	read_lock_bh(&table->tb6_lock);

	fn = fib6_locate(&table->tb6_root,
			 &cfg->fc_dst, cfg->fc_dst_len,
			 &cfg->fc_src, cfg->fc_src_len);

	if (fn) {
		for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
			if (cfg->fc_ifindex &&
			    (!rt->dst.dev ||
			     rt->dst.dev->ifindex != cfg->fc_ifindex))
				continue;
			if (cfg->fc_flags & RTF_GATEWAY &&
			    !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
				continue;
			if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
				continue;
			dst_hold(&rt->dst);
			read_unlock_bh(&table->tb6_lock);

			return __ip6_del_rt(rt, &cfg->fc_nlinfo);
		}
	}
	read_unlock_bh(&table->tb6_lock);

	return err;
}

Project: linux
File: route.c

struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
			    const struct in6_addr *saddr, int oif, int strict)
{
	struct flowi6 fl6 = {
		.flowi6_oif = oif,
		.daddr = *daddr,
	};
	struct dst_entry *dst;
	int flags = strict ? RT6_LOOKUP_F_IFACE : 0;

	if (saddr) {
		memcpy(&fl6.saddr, saddr, sizeof(*saddr));
		flags |= RT6_LOOKUP_F_HAS_SADDR;
	}

	dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
	if (dst->error == 0)
		return (struct rt6_info *) dst;

	dst_release(dst);

	return NULL;
}

Project: linux
File: route.c

static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
{
	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);

	return mtu ? : dst->dev->mtu;
}

Project: linux
File: route.c

static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
					 unsigned long old)
{
	return NULL;
}

Project: linux
File: route.c

struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
				    int flags)
{
	return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
}

Project: linux
File: route.c

static struct rt6_info *rt6_get_route_info(struct net *net,
					   const struct in6_addr *prefix, int prefixlen,
					   const struct in6_addr *gwaddr, int ifindex)
{
	struct fib6_node *fn;
	struct rt6_info *rt = NULL;
	struct fib6_table *table;

	table = fib6_get_table(net, RT6_TABLE_INFO);
	if (!table)
		return NULL;

	read_lock_bh(&table->tb6_lock);
	fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
	if (!fn)
		goto out;

	for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
		if (rt->dst.dev->ifindex != ifindex)
			continue;
		if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
			continue;
		if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
			continue;
		dst_hold(&rt->dst);
		break;
	}
out:
	read_unlock_bh(&table->tb6_lock);
	return rt;
}

Project: linux
File: route.c

static struct dst_entry *ip6_route_input_lookup(struct net *net,
						struct net_device *dev,
						struct flowi6 *fl6, int flags)
{
	if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
		flags |= RT6_LOOKUP_F_IFACE;

	return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
}

Project: linux
File: route.c

static int rt6_stats_seq_show(struct seq_file *seq, void *v)
{
	struct net *net = (struct net *)seq->private;
	seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
		   net->ipv6.rt6_stats->fib_nodes,
		   net->ipv6.rt6_stats->fib_route_nodes,
		   net->ipv6.rt6_stats->fib_rt_alloc,
		   net->ipv6.rt6_stats->fib_rt_entries,
		   net->ipv6.rt6_stats->fib_rt_cache,
		   dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
		   net->ipv6.rt6_stats->fib_discarded_routes);

	return 0;
}

Project: linux
File: route.c

int ip6_ins_rt(struct rt6_info *rt)
{
	struct nl_info info = {
		.nl_net = dev_net(rt->dst.dev),
	};
	return __ip6_ins_rt(rt, &info);
}

Project: linux
File: route.c

static int rt6_info_route(struct rt6_info *rt, void *p_arg)
{
	struct seq_file *m = p_arg;
	struct neighbour *n;

	seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);

#ifdef CONFIG_IPV6_SUBTREES
	seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
#else
	seq_puts(m, "00000000000000000000000000000000 00 ");
#endif
	n = rt->n;
	if (n) {
		seq_printf(m, "%pi6", n->primary_key);
	} else {
		seq_puts(m, "00000000000000000000000000000000");
	}
	seq_printf(m, " %08x %08x %08x %08x %8s\n",
		   rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
		   rt->dst.__use, rt->rt6i_flags,
		   rt->dst.dev ? rt->dst.dev->name : "");
	return 0;
}

Project: linux
File: route.c

struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
				  struct neighbour *neigh,
				  struct flowi6 *fl6)
{
	struct dst_entry *dst;
	struct rt6_info *rt;
	struct inet6_dev *idev = in6_dev_get(dev);
	struct net *net = dev_net(dev);

	if (unlikely(!idev))
		return ERR_PTR(-ENODEV);

	rt = ip6_dst_alloc(net, dev, 0, NULL);
	if (unlikely(!rt)) {
		in6_dev_put(idev);
		dst = ERR_PTR(-ENOMEM);
		goto out;
	}

	if (neigh)
		neigh_hold(neigh);
	else {
		neigh = ip6_neigh_lookup(&rt->dst, NULL, &fl6->daddr);
		if (IS_ERR(neigh)) {
			in6_dev_put(idev);
			dst_free(&rt->dst);
			return ERR_CAST(neigh);
		}
	}

	rt->dst.flags |= DST_HOST;
	rt->dst.output  = ip6_output;
	rt->n = neigh;
	atomic_set(&rt->dst.__refcnt, 1);
	rt->rt6i_dst.addr = fl6->daddr;
	rt->rt6i_dst.plen = 128;
	rt->rt6i_idev     = idev;
	dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255);

	spin_lock_bh(&icmp6_dst_lock);
	rt->dst.next = icmp6_dst_gc_list;
	icmp6_dst_gc_list = &rt->dst;
	spin_unlock_bh(&icmp6_dst_lock);

	fib6_force_start_gc(net);

	dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);

out:
	return dst;
}

Project: linux
File: route.c

static int rt6_info_hash_nhsfn(unsigned int candidate_count,
			       const struct flowi6 *fl6)
{
	unsigned int val = fl6->flowi6_proto;

	val ^= fl6->daddr.s6_addr32[0];
	val ^= fl6->daddr.s6_addr32[1];
	val ^= fl6->daddr.s6_addr32[2];
	val ^= fl6->daddr.s6_addr32[3];

	val ^= fl6->saddr.s6_addr32[0];
	val ^= fl6->saddr.s6_addr32[1];
	val ^= fl6->saddr.s6_addr32[2];
	val ^= fl6->saddr.s6_addr32[3];

	/* Work only if this not encapsulated */
	switch (fl6->flowi6_proto) {
	case IPPROTO_UDP:
	case IPPROTO_TCP:
	case IPPROTO_SCTP:
		val ^= fl6->fl6_sport;
		val ^= fl6->fl6_dport;
		break;

	case IPPROTO_ICMPV6:
		val ^= fl6->fl6_icmp_type;
		val ^= fl6->fl6_icmp_code;
		break;
	}
	/* RFC6438 recommands to use flowlabel */
	val ^= fl6->flowlabel;

	/* Perhaps, we need to tune, this function? */
	val = val ^ (val >> 7) ^ (val >> 12);
	return val % candidate_count;
}

Project: linux
File: route.c

struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
{
	struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
	struct dst_entry *new = NULL;

	rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
	if (rt) {
		new = &rt->dst;

		memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
		rt6_init_peer(rt, net->ipv6.peers);

		new->__use = 1;
		new->input = dst_discard;
		new->output = dst_discard;

		if (dst_metrics_read_only(&ort->dst))
			new->_metrics = ort->dst._metrics;
		else
			dst_copy_metrics(new, &ort->dst);
		rt->rt6i_idev = ort->rt6i_idev;
		if (rt->rt6i_idev)
			in6_dev_hold(rt->rt6i_idev);

		rt->rt6i_gateway = ort->rt6i_gateway;
		rt->rt6i_flags = ort->rt6i_flags;
		rt6_clean_expires(rt);
		rt->rt6i_metric = 0;

		memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
#ifdef CONFIG_IPV6_SUBTREES
		memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
#endif

		dst_free(new);
	}

	dst_release(dst_orig);
	return new ? new : ERR_PTR(-ENOMEM);
}

Project: linux
File: route.c

struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
				    const struct in6_addr *addr,
				    bool anycast)
{
	struct net *net = dev_net(idev->dev);
	struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL);
	int err;

	if (!rt) {
		net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n");
		return ERR_PTR(-ENOMEM);
	}

	in6_dev_hold(idev);

	rt->dst.flags |= DST_HOST;
	rt->dst.input = ip6_input;
	rt->dst.output = ip6_output;
	rt->rt6i_idev = idev;

	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
	if (anycast)
		rt->rt6i_flags |= RTF_ANYCAST;
	else
		rt->rt6i_flags |= RTF_LOCAL;
	err = rt6_bind_neighbour(rt, rt->dst.dev);
	if (err) {
		dst_free(&rt->dst);
		return ERR_PTR(err);
	}

	rt->rt6i_dst.addr = *addr;
	rt->rt6i_dst.plen = 128;
	rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);

	atomic_set(&rt->dst.__refcnt, 1);

	return rt;
}

Project: linux
File: route.c

static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
	struct fib6_config cfg;
	int err;

	err = rtm_to_fib6_config(skb, nlh, &cfg);
	if (err < 0)
		return err;

	if (cfg.fc_mp)
		return ip6_route_multipath(&cfg, 1);
	else
		return ip6_route_add(&cfg);
}

Project: linux
File: route.c

void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
{
	ip6_update_pmtu(skb, sock_net(sk), mtu,
			sk->sk_bound_dev_if, sk->sk_mark);
}

Project: linux
File: route.c

static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev)
{
	struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway);
	if (!n) {
		n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev);
		if (IS_ERR(n))
			return PTR_ERR(n);
	}
	rt->n = n;

	return 0;
}

Project: linux
File: route.c

void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
{
	const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
	struct dst_entry *dst;
	struct flowi6 fl6;

	memset(&fl6, 0, sizeof(fl6));
	fl6.flowi6_oif = oif;
	fl6.flowi6_mark = mark;
	fl6.flowi6_flags = 0;
	fl6.daddr = iph->daddr;
	fl6.saddr = iph->saddr;
	fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK;

	dst = ip6_route_output(net, NULL, &fl6);
	if (!dst->error)
		rt6_do_redirect(dst, NULL, skb);
	dst_release(dst);
}

Project: linux
File: route.c

static int __net_init ip6_route_net_init_late(struct net *net)
{
#ifdef CONFIG_PROC_FS
	proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
	proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
#endif
	return 0;
}

Project: linux
File: route.c

int ip6_dst_hoplimit(struct dst_entry *dst)
{
	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
	if (hoplimit == 0) {
		struct net_device *dev = dst->dev;
		struct inet6_dev *idev;

		rcu_read_lock();
		idev = __in6_dev_get(dev);
		if (idev)
			hoplimit = idev->cnf.hop_limit;
		else
			hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
		rcu_read_unlock();
	}
	return hoplimit;
}

Project: linux
File: route.c

struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
{
	struct ctl_table *table;

	table = kmemdup(ipv6_route_table_template,
			sizeof(ipv6_route_table_template),
			GFP_KERNEL);

	if (table) {
		table[0].data = &net->ipv6.sysctl.flush_delay;
		table[0].extra1 = net;
		table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
		table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
		table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
		table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
		table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
		table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
		table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
		table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
		table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
	}

	return table;
}

Project: linux
File: ip6_fib.c

struct fib6_table *fib6_get_table(struct net *net, u32 id)
{
	struct fib6_table *tb;
	struct hlist_head *head;
	struct hlist_node *node;
	unsigned int h;

	if (id == 0)
		id = RT6_TABLE_MAIN;
	h = id & (FIB6_TABLE_HASHSZ - 1);
	rcu_read_lock();
	head = &net->ipv6.fib_table_hash[h];
	hlist_for_each_entry_rcu(tb, node, head, tb6_hlist) {
		if (tb->tb6_id == id) {
			rcu_read_unlock();
			return tb;
		}
	}
	rcu_read_unlock();

	return NULL;
}

Project: linux
File: route.c

static inline int rt6_check_dev(struct rt6_info *rt, int oif)
{
	struct net_device *dev = rt->dst.dev;
	if (!oif || dev->ifindex == oif)
		return 2;
	if ((dev->flags & IFF_LOOPBACK) &&
	    rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
		return 1;
	return 0;
}

Project: linux
File: route.c

void rt6_ifdown(struct net *net, struct net_device *dev)
{
	struct arg_dev_net adn = {
		.dev = dev,
		.net = net,
	};

	fib6_clean_all(net, fib6_ifdown, 0, &adn);
	icmp6_clean_all(fib6_ifdown, &adn);
}

Project: linux
File: route.c

static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
			    void *arg)
{
	struct dst_entry *dst, **pprev;

	spin_lock_bh(&icmp6_dst_lock);
	pprev = &icmp6_dst_gc_list;
	while ((dst = *pprev) != NULL) {
		struct rt6_info *rt = (struct rt6_info *) dst;
		if (func(rt, arg)) {
			*pprev = dst->next;
			dst_free(dst);
		} else {
			pprev = &dst->next;
		}
	}
	spin_unlock_bh(&icmp6_dst_lock);
}