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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: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-04-17 17:33:13 -07:00 committed by David S. Miller
parent ae90d867f9
commit e8478e80e5
3 changed files with 23 additions and 26 deletions
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1
include/net/ip6_fib.h
View File

@ -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;

2
net/ipv6/addrconf.c
View File

@ -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),
};

46
net/ipv6/route.c
View File

@ -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;