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ipv4: Allow routes to use nexthop objects 

Add support for RTA_NH_ID attribute to allow a user to specify a
nexthop id to use with a route. fc_nh_id is added to fib_config to
hold the value passed in the RTA_NH_ID attribute. If a nexthop id
is given, the gateway, device, encap and multipath attributes can
not be set.

Update fib_nh_match to check ids on a route delete.

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 14:53:32 -07:00 committed by David S. Miller
parent 2d44234bf9
commit 493ced1ac4
3 changed files with 35 additions and 0 deletions
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1
include/net/ip_fib.h
View File

@ -40,6 +40,7 @@ struct fib_config {
u32 fc_flags;
u32 fc_priority;
__be32 fc_prefsrc;
u32 fc_nh_id;
struct nlattr *fc_mx;
struct rtnexthop *fc_mp;
int fc_mx_len;

19
net/ipv4/fib_frontend.c
View File

@ -671,6 +671,7 @@ const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
[RTA_IP_PROTO] = { .type = NLA_U8 },
[RTA_SPORT] = { .type = NLA_U16 },
[RTA_DPORT] = { .type = NLA_U16 },
[RTA_NH_ID] = { .type = NLA_U32 },
};
int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla,
@ -808,6 +809,18 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
if (err < 0)
goto errout;
break;
case RTA_NH_ID:
cfg->fc_nh_id = nla_get_u32(attr);
break;
}
}
if (cfg->fc_nh_id) {
if (cfg->fc_oif || cfg->fc_gw_family ||
cfg->fc_encap || cfg->fc_mp) {
NL_SET_ERR_MSG(extack,
"Nexthop specification and nexthop id are mutually exclusive");
return -EINVAL;
}
}
@ -834,6 +847,12 @@ static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err < 0)
goto errout;
if (cfg.fc_nh_id && !nexthop_find_by_id(net, cfg.fc_nh_id)) {
NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
err = -EINVAL;
goto errout;
}
tb = fib_get_table(net, cfg.fc_table);
if (!tb) {
NL_SET_ERR_MSG(extack, "FIB table does not exist");

15
net/ipv4/fib_semantics.c
View File

@ -789,6 +789,12 @@ int fib_nh_match(struct fib_config *cfg, struct fib_info *fi,
if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority)
return 1;
if (cfg->fc_nh_id) {
if (fi->nh && cfg->fc_nh_id == fi->nh->id)
return 0;
return 1;
}
if (cfg->fc_oif || cfg->fc_gw_family) {
struct fib_nh *nh = fib_info_nh(fi, 0);
@ -1302,6 +1308,15 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
goto err_inval;
}
if (cfg->fc_nh_id) {
nh = nexthop_find_by_id(net, cfg->fc_nh_id);
if (!nh) {
NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
goto err_inval;
}
nhs = 0;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (cfg->fc_mp) {
nhs = fib_count_nexthops(cfg->fc_mp, cfg->fc_mp_len, extack);