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ipv4: Add support to fib_config for IPv6 gateway 

Add support for an IPv6 gateway to fib_config. Since a gateway is either
IPv4 or IPv6, make it a union with fc_gw4 where fc_gw_family decides
which address is in use. Update current checks on family and gw4 to
handle ipv6 as well.

Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-04-05 16:30:30 -07:00 committed by David S. Miller
parent 0f5f7d7bf6
commit a4ea5d43c8
2 changed files with 27 additions and 7 deletions
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5
include/net/ip_fib.h
View File

@ -36,7 +36,10 @@ struct fib_config {
/* 2 bytes unused */
u32 fc_table;
__be32 fc_dst;
__be32 fc_gw4;
union {
__be32 fc_gw4;
struct in6_addr fc_gw6;
};
int fc_oif;
u32 fc_flags;
u32 fc_priority;

29
net/ipv4/fib_semantics.c
View File

@ -276,7 +276,7 @@ static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi)
for_nexthops(fi) {
if (nh->fib_nh_oif != onh->fib_nh_oif ||
nh->fib_nh_gw4 != onh->fib_nh_gw4 ||
nh->fib_nh_gw_family != onh->fib_nh_gw_family ||
nh->fib_nh_scope != onh->fib_nh_scope ||
#ifdef CONFIG_IP_ROUTE_MULTIPATH
nh->fib_nh_weight != onh->fib_nh_weight ||
@ -287,6 +287,15 @@ static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi)
lwtunnel_cmp_encap(nh->fib_nh_lws, onh->fib_nh_lws) ||
((nh->fib_nh_flags ^ onh->fib_nh_flags) & ~RTNH_COMPARE_MASK))
return -1;
if (nh->fib_nh_gw_family == AF_INET &&
nh->fib_nh_gw4 != onh->fib_nh_gw4)
return -1;
if (nh->fib_nh_gw_family == AF_INET6 &&
ipv6_addr_cmp(&nh->fib_nh_gw6, &onh->fib_nh_gw6))
return -1;
onh++;
} endfor_nexthops(fi);
return 0;
@ -511,10 +520,12 @@ int fib_nh_init(struct net *net, struct fib_nh *nh,
goto init_failure;
nh->fib_nh_oif = cfg->fc_oif;
if (cfg->fc_gw_family == AF_INET) {
nh->fib_nh_gw_family = cfg->fc_gw_family;
if (cfg->fc_gw_family == AF_INET)
nh->fib_nh_gw4 = cfg->fc_gw4;
nh->fib_nh_gw_family = AF_INET;
}
else if (cfg->fc_gw_family == AF_INET6)
nh->fib_nh_gw6 = cfg->fc_gw6;
nh->fib_nh_flags = cfg->fc_flags;
#ifdef CONFIG_IP_ROUTE_CLASSID
@ -621,9 +632,11 @@ static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
if (cfg->fc_gw_family) {
if (cfg->fc_gw_family != fi->fib_nh->fib_nh_gw_family ||
(cfg->fc_gw_family == AF_INET &&
fi->fib_nh->fib_nh_gw4 != cfg->fc_gw4)) {
fi->fib_nh->fib_nh_gw4 != cfg->fc_gw4) ||
(cfg->fc_gw_family == AF_INET6 &&
ipv6_addr_cmp(&fi->fib_nh->fib_nh_gw6, &cfg->fc_gw6))) {
NL_SET_ERR_MSG(extack,
"Nexthop gateway does not match RTA_GATEWAY");
"Nexthop gateway does not match RTA_GATEWAY or RTA_VIA");
goto errout;
}
}
@ -745,6 +758,10 @@ int fib_nh_match(struct fib_config *cfg, struct fib_info *fi,
cfg->fc_gw4 != fi->fib_nh->fib_nh_gw4)
return 1;
if (cfg->fc_gw_family == AF_INET6 &&
ipv6_addr_cmp(&cfg->fc_gw6, &fi->fib_nh->fib_nh_gw6))
return 1;
return 0;
}