Commit c0a72077 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

ipv6: Flip to fib_nexthop_info 



Export fib_nexthop_info and fib_add_nexthop for use by IPv6 code.
Remove rt6_nexthop_info and rt6_add_nexthop in favor of the IPv4
versions. Update fib_nexthop_info for IPv6 linkdown check and
RTA_GATEWAY for AF_INET6.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c2364199

include/net/ip_fib.h

+5 −0
Original line number Diff line number Diff line
@@ -492,4 +492,9 @@ u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr); 
int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,

			  struct fib_dump_filter *filter,

			  struct netlink_callback *cb);



int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,

		     unsigned int *flags, bool skip_oif);

int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh,

		    int nh_weight);

#endif  /* _NET_FIB_H */

net/ipv4/fib_semantics.c

+17 −5
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ 
#include <net/nexthop.h>

#include <net/lwtunnel.h>

#include <net/fib_notifier.h>

#include <net/addrconf.h>



#include "fib_lookup.h"
@@ -1317,7 +1318,7 @@ failure: 
	return ERR_PTR(err);

}



static int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc,

int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc,

		     unsigned int *flags, bool skip_oif)

{

	if (nhc->nhc_flags & RTNH_F_DEAD)
@@ -1332,6 +1333,10 @@ static int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc 
			if (ip_ignore_linkdown(nhc->nhc_dev))

				*flags |= RTNH_F_DEAD;

			break;

		case AF_INET6:

			if (ip6_ignore_linkdown(nhc->nhc_dev))

				*flags |= RTNH_F_DEAD;

			break;

		}

		rcu_read_unlock();

	}
@@ -1342,6 +1347,11 @@ static int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc 
			if (nla_put_in_addr(skb, RTA_GATEWAY, nhc->nhc_gw.ipv4))

				goto nla_put_failure;

			break;

		case AF_INET6:

			if (nla_put_in6_addr(skb, RTA_GATEWAY,

					     &nhc->nhc_gw.ipv6) < 0)

				goto nla_put_failure;

			break;

		}

	}
@@ -1362,9 +1372,10 @@ static int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc 
nla_put_failure:

	return -EMSGSIZE;

}

EXPORT_SYMBOL_GPL(fib_nexthop_info);



#ifdef CONFIG_IP_ROUTE_MULTIPATH

static int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nhc,

#if IS_ENABLED(CONFIG_IP_ROUTE_MULTIPATH) || IS_ENABLED(CONFIG_IPV6)

int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nhc,

		    int nh_weight)

{

	const struct net_device *dev = nhc->nhc_dev;
@@ -1391,6 +1402,7 @@ static int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nhc, 
nla_put_failure:

	return -EMSGSIZE;

}

EXPORT_SYMBOL_GPL(fib_add_nexthop);

#endif



#ifdef CONFIG_IP_ROUTE_MULTIPATH

net/ipv6/route.c

+6 −71
Original line number Diff line number Diff line
@@ -4582,73 +4582,6 @@ static size_t rt6_nlmsg_size(struct fib6_info *rt) 
	       + nexthop_len;

}



static int rt6_nexthop_info(struct sk_buff *skb, const struct fib6_nh *fib6_nh,

			    unsigned int *flags, bool skip_oif)

{

	if (fib6_nh->fib_nh_flags & RTNH_F_DEAD)

		*flags |= RTNH_F_DEAD;



	if (fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN) {

		*flags |= RTNH_F_LINKDOWN;



		rcu_read_lock();

		if (ip6_ignore_linkdown(fib6_nh->fib_nh_dev))

			*flags |= RTNH_F_DEAD;

		rcu_read_unlock();

	}



	if (fib6_nh->fib_nh_has_gw) {

		if (nla_put_in6_addr(skb, RTA_GATEWAY, &fib6_nh->fib_nh_gw6) < 0)

			goto nla_put_failure;

	}



	*flags |= (fib6_nh->fib_nh_flags & RTNH_F_ONLINK);

	if (fib6_nh->fib_nh_flags & RTNH_F_OFFLOAD)

		*flags |= RTNH_F_OFFLOAD;



	/* not needed for multipath encoding b/c it has a rtnexthop struct */

	if (!skip_oif && fib6_nh->fib_nh_dev &&

	    nla_put_u32(skb, RTA_OIF, fib6_nh->fib_nh_dev->ifindex))

		goto nla_put_failure;



	if (fib6_nh->fib_nh_lws &&

	    lwtunnel_fill_encap(skb, fib6_nh->fib_nh_lws) < 0)

		goto nla_put_failure;



	return 0;



nla_put_failure:

	return -EMSGSIZE;

}



/* add multipath next hop */

static int rt6_add_nexthop(struct sk_buff *skb, const struct fib6_nh *fib6_nh)

{

	const struct net_device *dev = fib6_nh->fib_nh_dev;

	struct rtnexthop *rtnh;

	unsigned int flags = 0;



	rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));

	if (!rtnh)

		goto nla_put_failure;



	rtnh->rtnh_hops = fib6_nh->fib_nh_weight - 1;

	rtnh->rtnh_ifindex = dev ? dev->ifindex : 0;



	if (rt6_nexthop_info(skb, fib6_nh, &flags, true) < 0)

		goto nla_put_failure;



	rtnh->rtnh_flags = flags;



	/* length of rtnetlink header + attributes */

	rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;



	return 0;



nla_put_failure:

	return -EMSGSIZE;

}



static int rt6_fill_node(struct net *net, struct sk_buff *skb,

			 struct fib6_info *rt, struct dst_entry *dst,

			 struct in6_addr *dest, struct in6_addr *src,
@@ -4765,19 +4698,21 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb, 
		if (!mp)

			goto nla_put_failure;



		if (rt6_add_nexthop(skb, &rt->fib6_nh) < 0)

		if (fib_add_nexthop(skb, &rt->fib6_nh.nh_common,

				    rt->fib6_nh.fib_nh_weight) < 0)

			goto nla_put_failure;



		list_for_each_entry_safe(sibling, next_sibling,

					 &rt->fib6_siblings, fib6_siblings) {

			if (rt6_add_nexthop(skb, &sibling->fib6_nh) < 0)

			if (fib_add_nexthop(skb, &sibling->fib6_nh.nh_common,

					    sibling->fib6_nh.fib_nh_weight) < 0)

				goto nla_put_failure;

		}



		nla_nest_end(skb, mp);

	} else {

		if (rt6_nexthop_info(skb, &rt->fib6_nh, &rtm->rtm_flags,

				     false) < 0)

		if (fib_nexthop_info(skb, &rt->fib6_nh.nh_common,

				     &rtm->rtm_flags, false) < 0)

			goto nla_put_failure;

	}

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