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Commit 19a9d136 authored Apr 05, 2019 by David Ahern Committed by David S. Miller Apr 08, 2019

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 <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 1a38c43d

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

+8 −0

Original line number	Original line	Diff line number	Diff line
	@@ -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");		NL_SET_ERR_MSG_MOD(info->extack, "FIB offload was aborted. Not configuring route");
	return notifier_from_errno(-EINVAL);		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;		break;
	}		}

drivers/net/ethernet/rocker/rocker_main.c

+9 −0

Original line number	Original line	Diff line number	Diff line
	@@ -2207,6 +2207,15 @@ static int rocker_router_fib_event(struct notifier_block *nb,
	switch (event) {		switch (event) {
	case FIB_EVENT_ENTRY_ADD: /* fall through */		case FIB_EVENT_ENTRY_ADD: /* fall through */
	case FIB_EVENT_ENTRY_DEL:		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));		memcpy(&fib_work->fen_info, ptr, sizeof(fib_work->fen_info));
	/* Take referece on fib_info to prevent it from being		/* Take referece on fib_info to prevent it from being
	* freed while work is queued. Release it afterwards.		* freed while work is queued. Release it afterwards.

include/net/ip_fib.h

+1 −0

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

net/ipv4/fib_semantics.c

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1349,6 +1349,8 @@ struct fib_info fib_create_info(struct fib_config cfg,

	change_nexthops(fi) {		change_nexthops(fi) {
	fib_info_update_nh_saddr(net, nexthop_nh);		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)		} endfor_nexthops(fi)

	fib_rebalance(fi);		fib_rebalance(fi);

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