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nexthops: Add ipv6 helper to walk all fib6_nh in a nexthop struct 

IPv6 has traditionally had a single fib6_nh per fib6_info. With
nexthops we can have multiple fib6_nh associated with a fib6_info.
Add a nexthop helper to invoke a callback for each fib6_nh in a
'struct nexthop'. If the callback returns non-0, the loop is
stopped and the return value passed to the caller.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-06-08 14:53:22 -07:00 committed by David S. Miller
parent 948622f984
commit f88c9aa12f
2 changed files with 35 additions and 0 deletions
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4
include/net/nexthop.h
View File

@ -305,4 +305,8 @@ static inline void nexthop_path_fib6_result(struct fib6_result *res, int hash)
res->nh = &nhi->fib6_nh;
}
}
int nexthop_for_each_fib6_nh(struct nexthop *nh,
int (*cb)(struct fib6_nh *nh, void *arg),
void *arg);
#endif

31
net/ipv4/nexthop.c
View File

@ -517,6 +517,37 @@ struct nexthop *nexthop_select_path(struct nexthop *nh, int hash)
}
EXPORT_SYMBOL_GPL(nexthop_select_path);
int nexthop_for_each_fib6_nh(struct nexthop *nh,
int (*cb)(struct fib6_nh *nh, void *arg),
void *arg)
{
struct nh_info *nhi;
int err;
if (nh->is_group) {
struct nh_group *nhg;
int i;
nhg = rcu_dereference_rtnl(nh->nh_grp);
for (i = 0; i < nhg->num_nh; i++) {
struct nh_grp_entry *nhge = &nhg->nh_entries[i];
nhi = rcu_dereference_rtnl(nhge->nh->nh_info);
err = cb(&nhi->fib6_nh, arg);
if (err)
return err;
}
} else {
nhi = rcu_dereference_rtnl(nh->nh_info);
err = cb(&nhi->fib6_nh, arg);
if (err)
return err;
}
return 0;
}
EXPORT_SYMBOL_GPL(nexthop_for_each_fib6_nh);
int fib6_check_nexthop(struct nexthop *nh, struct fib6_config *cfg,
struct netlink_ext_ack *extack)
{