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Commit 901731b8 authored by David Ahern's avatar David Ahern Committed by Daniel Borkmann
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net/ipv6: Add helper to return path MTU based on fib result 



Determine path MTU from a FIB lookup result. Logic is based on
ip6_dst_mtu_forward plus lookup of nexthop exception.

Add ip6_dst_mtu_forward to ipv6_stubs to handle access by core
bpf code.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 50d889b1

include/net/addrconf.h

+2 −0
Original line number Diff line number Diff line
@@ -236,6 +236,8 @@ struct ipv6_stub { 
						   struct flowi6 *fl6, int oif,

						   const struct sk_buff *skb,

						   int strict);

	u32 (*ip6_mtu_from_fib6)(struct fib6_info *f6i, struct in6_addr *daddr,

				 struct in6_addr *saddr);



	void (*udpv6_encap_enable)(void);

	void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,

include/net/ip6_fib.h

+6 −0
Original line number Diff line number Diff line
@@ -412,6 +412,12 @@ static inline struct net_device *fib6_info_nh_dev(const struct fib6_info *f6i) 
	return f6i->fib6_nh.nh_dev;

}



static inline

struct lwtunnel_state *fib6_info_nh_lwt(const struct fib6_info *f6i)

{

	return f6i->fib6_nh.nh_lwtstate;

}



void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,

		     unsigned int flags);

include/net/ip6_route.h

+3 −0
Original line number Diff line number Diff line
@@ -300,6 +300,9 @@ static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst) 
	return mtu;

}



u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,

		      struct in6_addr *saddr);



struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,

				   struct net_device *dev, struct sk_buff *skb,

				   const void *daddr);

net/ipv6/addrconf_core.c

+8 −0
Original line number Diff line number Diff line
@@ -161,12 +161,20 @@ eafnosupport_fib6_multipath_select(const struct net *net, struct fib6_info *f6i, 
	return f6i;

}



static u32

eafnosupport_ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,

			       struct in6_addr *saddr)

{

	return 0;

}



const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {

	.ipv6_dst_lookup   = eafnosupport_ipv6_dst_lookup,

	.fib6_get_table    = eafnosupport_fib6_get_table,

	.fib6_table_lookup = eafnosupport_fib6_table_lookup,

	.fib6_lookup       = eafnosupport_fib6_lookup,

	.fib6_multipath_select = eafnosupport_fib6_multipath_select,

	.ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6,

};

EXPORT_SYMBOL_GPL(ipv6_stub);

net/ipv6/af_inet6.c

+1 −0
Original line number Diff line number Diff line
@@ -894,6 +894,7 @@ static const struct ipv6_stub ipv6_stub_impl = { 
	.fib6_table_lookup = fib6_table_lookup,

	.fib6_lookup       = fib6_lookup,

	.fib6_multipath_select = fib6_multipath_select,

	.ip6_mtu_from_fib6 = ip6_mtu_from_fib6,

	.udpv6_encap_enable = udpv6_encap_enable,

	.ndisc_send_na = ndisc_send_na,

	.nd_tbl	= &nd_tbl,