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ipv6: Remove external dependency on rt6i_gateway and RTF_ANYCAST

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When creating a RTF_CACHE route, RTF_ANYCAST is set based on rt6i_dst.
Also, rt6i_gateway is always set to the nexthop while the nexthop
could be a gateway or the rt6i_dst.addr.

After removing the rt6i_dst and rt6i_src dependency in the last patch,
we also need to stop the caller from depending on rt6i_gateway and
RTF_ANYCAST.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau 2015-05-22 20:55:58 -07:00 committed by David S. Miller
parent fd0273d793
commit 2647a9b070
7 changed files with 24 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
include/net/ip6_route.h
View File

@ -163,11 +163,14 @@ static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
return rt->rt6i_flags & RTF_LOCAL;
}
static inline bool ipv6_anycast_destination(const struct sk_buff *skb)
static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
const struct in6_addr *daddr)
{
struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
struct rt6_info *rt = (struct rt6_info *)dst;
return rt->rt6i_flags & RTF_ANYCAST;
return rt->rt6i_flags & RTF_ANYCAST ||
(rt->rt6i_dst.plen != 128 &&
ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
}
int ip6_fragment(struct sock *sk, struct sk_buff *skb,
@ -194,9 +197,15 @@ static inline bool ip6_sk_ignore_df(const struct sock *sk)
inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
}
static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt)
static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
struct in6_addr *daddr)
{
return &rt->rt6i_gateway;
if (rt->rt6i_flags & RTF_GATEWAY)
return &rt->rt6i_gateway;
else if (rt->rt6i_flags & RTF_CACHE)
return &rt->rt6i_dst.addr;
else
return daddr;
}
#endif

2
net/bluetooth/6lowpan.c
View File

@ -192,7 +192,7 @@ static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_dev *dev,
if (ipv6_addr_any(nexthop))
return NULL;
} else {
nexthop = rt6_nexthop(rt);
nexthop = rt6_nexthop(rt, daddr);
/* We need to remember the address because it is needed
* by bt_xmit() when sending the packet. In bt_xmit(), the

4
net/ipv6/icmp.c
View File

@ -337,7 +337,7 @@ static struct dst_entry *icmpv6_route_lookup(struct net *net,
* We won't send icmp if the destination is known
* anycast.
*/
if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) {
if (ipv6_anycast_destination(dst, &fl6->daddr)) {
net_dbg_ratelimited("icmp6_send: acast source\n");
dst_release(dst);
return ERR_PTR(-EINVAL);
@ -564,7 +564,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
if (!ipv6_unicast_destination(skb) &&
!(net->ipv6.sysctl.anycast_src_echo_reply &&
ipv6_anycast_destination(skb)))
ipv6_anycast_destination(skb_dst(skb), saddr)))
saddr = NULL;
memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));

5
net/ipv6/ip6_output.c
View File

@ -105,7 +105,7 @@ static int ip6_finish_output2(struct sock *sk, struct sk_buff *skb)
}
rcu_read_lock_bh();
nexthop = rt6_nexthop((struct rt6_info *)dst);
nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
if (unlikely(!neigh))
neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
@ -934,7 +934,8 @@ static int ip6_dst_lookup_tail(struct sock *sk,
*/
rt = (struct rt6_info *) *dst;
rcu_read_lock_bh();
n = __ipv6_neigh_lookup_noref(rt->dst.dev, rt6_nexthop(rt));
n = __ipv6_neigh_lookup_noref(rt->dst.dev,
rt6_nexthop(rt, &fl6->daddr));
err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0;
rcu_read_unlock_bh();

6
net/ipv6/route.c
View File

@ -1945,11 +1945,7 @@ static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
if (rt->rt6i_idev)
in6_dev_hold(rt->rt6i_idev);
rt->dst.lastuse = jiffies;
if (ort->rt6i_flags & RTF_GATEWAY)
rt->rt6i_gateway = ort->rt6i_gateway;
else
rt->rt6i_gateway = *dest;
rt->rt6i_gateway = ort->rt6i_gateway;
rt->rt6i_flags = ort->rt6i_flags;
rt6_set_from(rt, ort);
rt->rt6i_metric = 0;

4
net/netfilter/nf_conntrack_h323_main.c
View File

@ -779,8 +779,8 @@ static int callforward_do_filter(struct net *net,
flowi6_to_flowi(&fl1), false)) {
if (!afinfo->route(net, (struct dst_entry **)&rt2,
flowi6_to_flowi(&fl2), false)) {
if (ipv6_addr_equal(rt6_nexthop(rt1),
rt6_nexthop(rt2)) &&
if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr),
rt6_nexthop(rt2, &fl2.daddr)) &&
rt1->dst.dev == rt2->dst.dev)
ret = 1;
dst_release(&rt2->dst);

2
net/netfilter/xt_addrtype.c
View File

@ -73,7 +73,7 @@ static u32 match_lookup_rt6(struct net *net, const struct net_device *dev,
if (dev == NULL && rt->rt6i_flags & RTF_LOCAL)
ret |= XT_ADDRTYPE_LOCAL;
if (rt->rt6i_flags & RTF_ANYCAST)
if (ipv6_anycast_destination((struct dst_entry *)rt, addr))
ret |= XT_ADDRTYPE_ANYCAST;
dst_release(&rt->dst);