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net: Refactor path selection in __ip_route_output_key_hash 

VRF device needs the same path selection following lookup to set source
address. Rather than duplicating code, move existing code into a
function that is exported to modules.

Code move only; no functional change.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2015-10-05 08:51:25 -07:00 committed by David S. Miller
parent fee6d4c777
commit 3ce58d8435
3 changed files with 24 additions and 15 deletions
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2
include/net/ip_fib.h
View File

@ -329,6 +329,8 @@ static inline int fib_multipath_hash(__be32 saddr, __be32 daddr)
}
void fib_select_multipath(struct fib_result *res, int hash);
void fib_select_path(struct net *net, struct fib_result *res,
struct flowi4 *fl4, int mp_hash);
/* Exported by fib_trie.c */
void fib_trie_init(void);

21
net/ipv4/fib_semantics.c
View File

@ -1557,3 +1557,24 @@ void fib_select_multipath(struct fib_result *res, int hash)
res->nh_sel = 0;
}
#endif
void fib_select_path(struct net *net, struct fib_result *res,
struct flowi4 *fl4, int mp_hash)
{
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (res->fi->fib_nhs > 1 && fl4->flowi4_oif == 0) {
if (mp_hash < 0)
mp_hash = fib_multipath_hash(fl4->saddr, fl4->daddr);
fib_select_multipath(res, mp_hash);
}
else
#endif
if (!res->prefixlen &&
res->table->tb_num_default > 1 &&
res->type == RTN_UNICAST && !fl4->flowi4_oif)
fib_select_default(fl4, res);
if (!fl4->saddr)
fl4->saddr = FIB_RES_PREFSRC(net, *res);
}
EXPORT_SYMBOL_GPL(fib_select_path);

16
net/ipv4/route.c
View File

@ -2238,21 +2238,7 @@ struct rtable *__ip_route_output_key_hash(struct net *net, struct flowi4 *fl4,
goto make_route;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (res.fi->fib_nhs > 1 && fl4->flowi4_oif == 0) {
if (mp_hash < 0)
mp_hash = fib_multipath_hash(fl4->saddr, fl4->daddr);
fib_select_multipath(&res, mp_hash);
}
else
#endif
if (!res.prefixlen &&
res.table->tb_num_default > 1 &&
res.type == RTN_UNICAST && !fl4->flowi4_oif)
fib_select_default(fl4, &res);
if (!fl4->saddr)
fl4->saddr = FIB_RES_PREFSRC(net, res);
fib_select_path(net, &res, fl4, mp_hash);
dev_out = FIB_RES_DEV(res);
fl4->flowi4_oif = dev_out->ifindex;