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ipv6: Combine rt6_alloc_cow and rt6_alloc_clone

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A prep work for creating RTF_CACHE on exception only.  After this
patch, the same condition (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))
is checked twice. This redundancy will be removed in the later patch.

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 20:55:59 -07:00 committed by David S. Miller
parent 2647a9b070
commit 8b9df26577
1 changed files with 20 additions and 25 deletions
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45
net/ipv6/route.c
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@ -655,6 +655,11 @@ static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
return match ? match : net->ipv6.ip6_null_entry;
}
static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
{
return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
}
#ifdef CONFIG_IPV6_ROUTE_INFO
int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
const struct in6_addr *gwaddr)
@ -833,9 +838,9 @@ int ip6_ins_rt(struct rt6_info *rt)
return __ip6_ins_rt(rt, &info, &mxc);
}
static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
const struct in6_addr *daddr,
const struct in6_addr *saddr)
static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
const struct in6_addr *daddr,
const struct in6_addr *saddr)
{
struct rt6_info *rt;
@ -846,33 +851,24 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
rt = ip6_rt_copy(ort, daddr);
if (rt) {
if (ort->rt6i_dst.plen != 128 &&
ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
rt->rt6i_flags |= RTF_ANYCAST;
rt->rt6i_flags |= RTF_CACHE;
if (!rt6_is_gw_or_nonexthop(ort)) {
if (ort->rt6i_dst.plen != 128 &&
ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
rt->rt6i_flags |= RTF_ANYCAST;
#ifdef CONFIG_IPV6_SUBTREES
if (rt->rt6i_src.plen && saddr) {
rt->rt6i_src.addr = *saddr;
rt->rt6i_src.plen = 128;
}
if (rt->rt6i_src.plen && saddr) {
rt->rt6i_src.addr = *saddr;
rt->rt6i_src.plen = 128;
}
#endif
}
}
return rt;
}
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;
return rt;
}
static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
struct flowi6 *fl6, int flags)
{
@ -918,10 +914,9 @@ redo_rt6_select:
if (rt->rt6i_flags & RTF_CACHE)
goto out2;
if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
else if (!(rt->dst.flags & DST_HOST) || !(rt->rt6i_flags & RTF_LOCAL))
nrt = rt6_alloc_clone(rt, &fl6->daddr);
if (!rt6_is_gw_or_nonexthop(rt) ||
!(rt->dst.flags & DST_HOST) || !(rt->rt6i_flags & RTF_LOCAL))
nrt = ip6_rt_cache_alloc(rt, &fl6->daddr, &fl6->saddr);
else
goto out2;