Commit e8478e80 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

net/ipv6: Save route type in rt6_info 



The RTN_ type for IPv6 FIB entries is currently embedded in rt6i_flags
and dst.error. Since dst is going to be removed, it can no longer be
relied on for FIB dumps so save the route type as fib6_type.

fc_type is set in current users based on the algorithm in rt6_fill_node:
  - rt6i_flags contains RTF_LOCAL: fc_type = RTN_LOCAL
  - rt6i_flags contains RTF_ANYCAST: fc_type = RTN_ANYCAST
  - else fc_type = RTN_UNICAST

Similarly, fib6_type is set in the rt6_info templates based on the
RTF_REJECT section of rt6_fill_node converting dst.error to RTN type.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ae90d867

include/net/ip6_fib.h

+1 −0
Original line number Diff line number Diff line
@@ -174,6 +174,7 @@ struct rt6_info { 
	int				rt6i_nh_weight;

	unsigned short			rt6i_nfheader_len;

	u8				rt6i_protocol;

	u8				fib6_type;

	u8				exception_bucket_flushed:1,

					should_flush:1,

					unused:6;

net/ipv6/addrconf.c

+2 −0
Original line number Diff line number Diff line
@@ -2331,6 +2331,7 @@ addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 
		.fc_flags = RTF_UP | flags,

		.fc_nlinfo.nl_net = dev_net(dev),

		.fc_protocol = RTPROT_KERNEL,

		.fc_type = RTN_UNICAST,

	};



	cfg.fc_dst = *pfx;
@@ -2394,6 +2395,7 @@ static void addrconf_add_mroute(struct net_device *dev) 
		.fc_ifindex = dev->ifindex,

		.fc_dst_len = 8,

		.fc_flags = RTF_UP,

		.fc_type = RTN_UNICAST,

		.fc_nlinfo.nl_net = dev_net(dev),

	};

net/ipv6/route.c

+20 −26
Original line number Diff line number Diff line
@@ -307,6 +307,7 @@ static const struct rt6_info ip6_null_entry_template = { 
	.rt6i_protocol  = RTPROT_KERNEL,

	.rt6i_metric	= ~(u32) 0,

	.rt6i_ref	= ATOMIC_INIT(1),

	.fib6_type	= RTN_UNREACHABLE,

};



#ifdef CONFIG_IPV6_MULTIPLE_TABLES
@@ -324,6 +325,7 @@ static const struct rt6_info ip6_prohibit_entry_template = { 
	.rt6i_protocol  = RTPROT_KERNEL,

	.rt6i_metric	= ~(u32) 0,

	.rt6i_ref	= ATOMIC_INIT(1),

	.fib6_type	= RTN_PROHIBIT,

};



static const struct rt6_info ip6_blk_hole_entry_template = {
@@ -339,6 +341,7 @@ static const struct rt6_info ip6_blk_hole_entry_template = { 
	.rt6i_protocol  = RTPROT_KERNEL,

	.rt6i_metric	= ~(u32) 0,

	.rt6i_ref	= ATOMIC_INIT(1),

	.fib6_type	= RTN_BLACKHOLE,

};



#endif
@@ -2802,6 +2805,11 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg, 
		goto out;

	}



	if (cfg->fc_type > RTN_MAX) {

		NL_SET_ERR_MSG(extack, "Invalid route type");

		goto out;

	}



	if (cfg->fc_dst_len > 128) {

		NL_SET_ERR_MSG(extack, "Invalid prefix length");

		goto out;
@@ -2914,6 +2922,8 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg, 
	rt->rt6i_metric = cfg->fc_metric;

	rt->rt6i_nh_weight = 1;



	rt->fib6_type = cfg->fc_type;



	/* We cannot add true routes via loopback here,

	   they would result in kernel looping; promote them to reject routes

	 */
@@ -3354,6 +3364,7 @@ static struct rt6_info *rt6_add_route_info(struct net *net, 
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |

				  RTF_UP | RTF_PREF(pref),

		.fc_protocol = RTPROT_RA,

		.fc_type = RTN_UNICAST,

		.fc_nlinfo.portid = 0,

		.fc_nlinfo.nlh = NULL,

		.fc_nlinfo.nl_net = net,
@@ -3410,6 +3421,7 @@ struct rt6_info *rt6_add_dflt_router(struct net *net, 
		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |

				  RTF_UP | RTF_EXPIRES | RTF_PREF(pref),

		.fc_protocol = RTPROT_RA,

		.fc_type = RTN_UNICAST,

		.fc_nlinfo.portid = 0,

		.fc_nlinfo.nlh = NULL,

		.fc_nlinfo.nl_net = net,
@@ -3485,6 +3497,7 @@ static void rtmsg_to_fib6_config(struct net *net, 
	cfg->fc_dst_len = rtmsg->rtmsg_dst_len;

	cfg->fc_src_len = rtmsg->rtmsg_src_len;

	cfg->fc_flags = rtmsg->rtmsg_flags;

	cfg->fc_type = rtmsg->rtmsg_type;



	cfg->fc_nlinfo.nl_net = net;
@@ -3606,10 +3619,13 @@ struct rt6_info *addrconf_dst_alloc(struct net *net, 


	rt->rt6i_protocol = RTPROT_KERNEL;

	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;

	if (anycast)

	if (anycast) {

		rt->fib6_type = RTN_ANYCAST;

		rt->rt6i_flags |= RTF_ANYCAST;

	else

	} else {

		rt->fib6_type = RTN_LOCAL;

		rt->rt6i_flags |= RTF_LOCAL;

	}



	rt->rt6i_gateway  = *addr;

	rt->rt6i_dst.addr = *addr;
@@ -4509,30 +4525,8 @@ static int rt6_fill_node(struct net *net, 
	rtm->rtm_table = table;

	if (nla_put_u32(skb, RTA_TABLE, table))

		goto nla_put_failure;

	if (rt->rt6i_flags & RTF_REJECT) {

		switch (rt->dst.error) {

		case -EINVAL:

			rtm->rtm_type = RTN_BLACKHOLE;

			break;

		case -EACCES:

			rtm->rtm_type = RTN_PROHIBIT;

			break;

		case -EAGAIN:

			rtm->rtm_type = RTN_THROW;

			break;

		default:

			rtm->rtm_type = RTN_UNREACHABLE;

			break;

		}

	}

	else if (rt->rt6i_flags & RTF_LOCAL)

		rtm->rtm_type = RTN_LOCAL;

	else if (rt->rt6i_flags & RTF_ANYCAST)

		rtm->rtm_type = RTN_ANYCAST;

	else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))

		rtm->rtm_type = RTN_LOCAL;

	else

		rtm->rtm_type = RTN_UNICAST;



	rtm->rtm_type = rt->fib6_type;

	rtm->rtm_flags = 0;

	rtm->rtm_scope = RT_SCOPE_UNIVERSE;

	rtm->rtm_protocol = rt->rt6i_protocol;

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