ipv4: Flag fib_info with a fib_nh using IPv6 gateway

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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 772aa78cab513ca2799548af569426e583282439..5f05723011b4c7c6bcd7b4afa4cca66933a6fabe 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -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;
        }
 

diff --git a/drivers/net/ethernet/rocker/rocker_main.c b/drivers/net/ethernet/rocker/rocker_main.c
index a71c900ca04f50396928d7a441cb57f429cf6737..7ae6c124bfe92ae360d754cf679ef4a166aa374d 100644 (file)
--- a/drivers/net/ethernet/rocker/rocker_main.c
+++ b/drivers/net/ethernet/rocker/rocker_main.c
@@ -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.

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index f1c452f618a973215f8d3387e591e8bda720a3dc..337106469ec5de2664bbe017247ae0ac9b52423c 100644 (file)
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -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

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index c1ea138335a26d8a30fd4fba1daeae86b89f6564..4a968e24507bd3fbdc8af55a60b6e2dd386ba604 100644 (file)
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -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);