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ipv4: Flag fib_info with a fib_nh using IPv6 gateway

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Until support is added to the offload drivers, they need to be able to
reject routes with an IPv6 gateway. To that end add a flag to fib_info
that indicates if any fib_nh has a v6 gateway. The flag allows the drivers
to efficiently know the use of a v6 gateway without walking all fib_nh
tied to a fib_info each time a route is added.

Update mlxsw and rocker to reject the routes with extack message as to why.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-04-05 16:30:39 -07:00 committed by David S. Miller
parent 1a38c43d31
commit 19a9d136f1
4 changed files with 20 additions and 0 deletions
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8
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
View File

@ -6092,6 +6092,14 @@ static int mlxsw_sp_router_fib_event(struct notifier_block *nb,
NL_SET_ERR_MSG_MOD(info->extack, "FIB offload was aborted. Not configuring route");
return notifier_from_errno(-EINVAL);
}
if (info->family == AF_INET) {
struct fib_entry_notifier_info *fen_info = ptr;
if (fen_info->fi->fib_nh_is_v6) {
NL_SET_ERR_MSG_MOD(info->extack, "IPv6 gateway with IPv4 route is not supported");
return notifier_from_errno(-EINVAL);
}
}
break;
}

9
drivers/net/ethernet/rocker/rocker_main.c
View File

@ -2207,6 +2207,15 @@ static int rocker_router_fib_event(struct notifier_block *nb,
switch (event) {
case FIB_EVENT_ENTRY_ADD: /* fall through */
case FIB_EVENT_ENTRY_DEL:
if (info->family == AF_INET) {
struct fib_entry_notifier_info *fen_info = ptr;
if (fen_info->fi->fib_nh_is_v6) {
NL_SET_ERR_MSG_MOD(info->extack, "IPv6 gateway with IPv4 route is not supported");
return notifier_from_errno(-EINVAL);
}
}
memcpy(&fib_work->fen_info, ptr, sizeof(fib_work->fen_info));
/* Take referece on fib_info to prevent it from being
* freed while work is queued. Release it afterwards.

1
include/net/ip_fib.h
View File

@ -147,6 +147,7 @@ struct fib_info {
#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
int fib_nhs;
bool fib_nh_is_v6;
struct rcu_head rcu;
struct fib_nh fib_nh[0];
#define fib_dev fib_nh[0].fib_nh_dev

2
net/ipv4/fib_semantics.c
View File

@ -1349,6 +1349,8 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
change_nexthops(fi) {
fib_info_update_nh_saddr(net, nexthop_nh);
if (nexthop_nh->fib_nh_gw_family == AF_INET6)
fi->fib_nh_is_v6 = true;
} endfor_nexthops(fi)
fib_rebalance(fi);