aboutsummaryrefslogtreecommitdiffstats
path: root/net/ipv6/route.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv6/route.c')
-rw-r--r--net/ipv6/route.c110
1 files changed, 59 insertions, 51 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index de2b1decd786..e8987da06667 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -72,7 +72,8 @@
#define RT6_TRACE(x...) do { ; } while (0)
#endif
-static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
+static struct rt6_info *ip6_rt_copy(const struct rt6_info *ort,
+ const struct in6_addr *dest);
static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
static unsigned int ip6_default_advmss(const struct dst_entry *dst);
static unsigned int ip6_default_mtu(const struct dst_entry *dst);
@@ -127,6 +128,11 @@ static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
return p;
}
+static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr)
+{
+ return __neigh_lookup_errno(&nd_tbl, daddr, dst->dev);
+}
+
static struct dst_ops ip6_dst_ops_template = {
.family = AF_INET6,
.protocol = cpu_to_be16(ETH_P_IPV6),
@@ -142,6 +148,7 @@ static struct dst_ops ip6_dst_ops_template = {
.link_failure = ip6_link_failure,
.update_pmtu = ip6_rt_update_pmtu,
.local_out = __ip6_local_out,
+ .neigh_lookup = ip6_neigh_lookup,
};
static unsigned int ip6_blackhole_default_mtu(const struct dst_entry *dst)
@@ -168,6 +175,7 @@ static struct dst_ops ip6_dst_blackhole_ops = {
.default_advmss = ip6_default_advmss,
.update_pmtu = ip6_rt_blackhole_update_pmtu,
.cow_metrics = ip6_rt_blackhole_cow_metrics,
+ .neigh_lookup = ip6_neigh_lookup,
};
static const u32 ip6_template_metrics[RTAX_MAX] = {
@@ -228,9 +236,10 @@ static struct rt6_info ip6_blk_hole_entry_template = {
/* allocate dst with ip6_dst_ops */
static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops,
- struct net_device *dev)
+ struct net_device *dev,
+ int flags)
{
- struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, 0);
+ struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, flags);
memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry));
@@ -355,7 +364,7 @@ out:
#ifdef CONFIG_IPV6_ROUTER_PREF
static void rt6_probe(struct rt6_info *rt)
{
- struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL;
+ struct neighbour *neigh = rt ? dst_get_neighbour(&rt->dst) : NULL;
/*
* Okay, this does not seem to be appropriate
* for now, however, we need to check if it
@@ -403,7 +412,7 @@ static inline int rt6_check_dev(struct rt6_info *rt, int oif)
static inline int rt6_check_neigh(struct rt6_info *rt)
{
- struct neighbour *neigh = rt->rt6i_nexthop;
+ struct neighbour *neigh = dst_get_neighbour(&rt->dst);
int m;
if (rt->rt6i_flags & RTF_NONEXTHOP ||
!(rt->rt6i_flags & RTF_GATEWAY))
@@ -682,7 +691,8 @@ int ip6_ins_rt(struct rt6_info *rt)
return __ip6_ins_rt(rt, &info);
}
-static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, const struct in6_addr *daddr,
+static struct rt6_info *rt6_alloc_cow(const struct rt6_info *ort,
+ const struct in6_addr *daddr,
const struct in6_addr *saddr)
{
struct rt6_info *rt;
@@ -691,7 +701,7 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, const struct in6_add
* Clone the route.
*/
- rt = ip6_rt_copy(ort);
+ rt = ip6_rt_copy(ort, daddr);
if (rt) {
struct neighbour *neigh;
@@ -699,12 +709,11 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, const struct in6_add
if (!(rt->rt6i_flags&RTF_GATEWAY)) {
if (rt->rt6i_dst.plen != 128 &&
- ipv6_addr_equal(&rt->rt6i_dst.addr, daddr))
+ ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
rt->rt6i_flags |= RTF_ANYCAST;
ipv6_addr_copy(&rt->rt6i_gateway, daddr);
}
- ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
rt->rt6i_dst.plen = 128;
rt->rt6i_flags |= RTF_CACHE;
rt->dst.flags |= DST_HOST;
@@ -744,22 +753,23 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, const struct in6_add
dst_free(&rt->dst);
return NULL;
}
- rt->rt6i_nexthop = neigh;
+ dst_set_neighbour(&rt->dst, neigh);
}
return rt;
}
-static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, const struct in6_addr *daddr)
+static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
+ const struct in6_addr *daddr)
{
- struct rt6_info *rt = ip6_rt_copy(ort);
+ struct rt6_info *rt = ip6_rt_copy(ort, daddr);
+
if (rt) {
- ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
rt->rt6i_dst.plen = 128;
rt->rt6i_flags |= RTF_CACHE;
rt->dst.flags |= DST_HOST;
- rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
+ dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour(&ort->dst)));
}
return rt;
}
@@ -793,7 +803,7 @@ restart:
dst_hold(&rt->dst);
read_unlock_bh(&table->tb6_lock);
- if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
+ if (!dst_get_neighbour(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP))
nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
else if (!(rt->dst.flags & DST_HOST))
nrt = rt6_alloc_clone(rt, &fl6->daddr);
@@ -899,7 +909,10 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori
new->input = dst_discard;
new->output = dst_discard;
- dst_copy_metrics(new, &ort->dst);
+ if (dst_metrics_read_only(&ort->dst))
+ new->_metrics = ort->dst._metrics;
+ else
+ dst_copy_metrics(new, &ort->dst);
rt->rt6i_idev = ort->rt6i_idev;
if (rt->rt6i_idev)
in6_dev_hold(rt->rt6i_idev);
@@ -1042,7 +1055,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
if (unlikely(idev == NULL))
return NULL;
- rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev);
+ rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev, 0);
if (unlikely(rt == NULL)) {
in6_dev_put(idev);
goto out;
@@ -1057,19 +1070,12 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
}
rt->rt6i_idev = idev;
- rt->rt6i_nexthop = neigh;
+ dst_set_neighbour(&rt->dst, neigh);
atomic_set(&rt->dst.__refcnt, 1);
+ ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255);
rt->dst.output = ip6_output;
-#if 0 /* there's no chance to use these for ndisc */
- rt->dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
- ? DST_HOST
- : 0;
- ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
- rt->rt6i_dst.plen = 128;
-#endif
-
spin_lock_bh(&icmp6_dst_lock);
rt->dst.next = icmp6_dst_gc_list;
icmp6_dst_gc_list = &rt->dst;
@@ -1214,7 +1220,7 @@ int ip6_route_add(struct fib6_config *cfg)
goto out;
}
- rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL);
+ rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL, DST_NOCOUNT);
if (rt == NULL) {
err = -ENOMEM;
@@ -1244,7 +1250,7 @@ int ip6_route_add(struct fib6_config *cfg)
ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
rt->rt6i_dst.plen = cfg->fc_dst_len;
if (rt->rt6i_dst.plen == 128)
- rt->dst.flags = DST_HOST;
+ rt->dst.flags |= DST_HOST;
#ifdef CONFIG_IPV6_SUBTREES
ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
@@ -1345,12 +1351,12 @@ int ip6_route_add(struct fib6_config *cfg)
rt->rt6i_prefsrc.plen = 0;
if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
- rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
- if (IS_ERR(rt->rt6i_nexthop)) {
- err = PTR_ERR(rt->rt6i_nexthop);
- rt->rt6i_nexthop = NULL;
+ struct neighbour *n = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
+ if (IS_ERR(n)) {
+ err = PTR_ERR(n);
goto out;
}
+ dst_set_neighbour(&rt->dst, n);
}
rt->rt6i_flags = cfg->fc_flags;
@@ -1581,10 +1587,10 @@ void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src,
dst_confirm(&rt->dst);
/* Duplicate redirect: silently ignore. */
- if (neigh == rt->dst.neighbour)
+ if (neigh == dst_get_neighbour(&rt->dst))
goto out;
- nrt = ip6_rt_copy(rt);
+ nrt = ip6_rt_copy(rt, dest);
if (nrt == NULL)
goto out;
@@ -1592,12 +1598,11 @@ void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src,
if (on_link)
nrt->rt6i_flags &= ~RTF_GATEWAY;
- ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
nrt->rt6i_dst.plen = 128;
nrt->dst.flags |= DST_HOST;
ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
- nrt->rt6i_nexthop = neigh_clone(neigh);
+ dst_set_neighbour(&nrt->dst, neigh_clone(neigh));
if (ip6_ins_rt(nrt))
goto out;
@@ -1677,7 +1682,7 @@ again:
1. It is connected route. Action: COW
2. It is gatewayed route or NONEXTHOP route. Action: clone it.
*/
- if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
+ if (!dst_get_neighbour(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP))
nrt = rt6_alloc_cow(rt, daddr, saddr);
else
nrt = rt6_alloc_clone(rt, daddr);
@@ -1730,16 +1735,19 @@ void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *sad
* Misc support functions
*/
-static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
+static struct rt6_info *ip6_rt_copy(const struct rt6_info *ort,
+ const struct in6_addr *dest)
{
struct net *net = dev_net(ort->rt6i_dev);
struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops,
- ort->dst.dev);
+ ort->dst.dev, 0);
if (rt) {
rt->dst.input = ort->dst.input;
rt->dst.output = ort->dst.output;
+ ipv6_addr_copy(&rt->rt6i_dst.addr, dest);
+ rt->rt6i_dst.plen = ort->rt6i_dst.plen;
dst_copy_metrics(&rt->dst, &ort->dst);
rt->dst.error = ort->dst.error;
rt->rt6i_idev = ort->rt6i_idev;
@@ -1752,7 +1760,6 @@ static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
rt->rt6i_metric = 0;
- memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
#ifdef CONFIG_IPV6_SUBTREES
memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
#endif
@@ -2013,7 +2020,7 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
{
struct net *net = dev_net(idev->dev);
struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops,
- net->loopback_dev);
+ net->loopback_dev, 0);
struct neighbour *neigh;
if (rt == NULL) {
@@ -2025,7 +2032,7 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
in6_dev_hold(idev);
- rt->dst.flags = DST_HOST;
+ rt->dst.flags |= DST_HOST;
rt->dst.input = ip6_input;
rt->dst.output = ip6_output;
rt->rt6i_idev = idev;
@@ -2042,7 +2049,7 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
return ERR_CAST(neigh);
}
- rt->rt6i_nexthop = neigh;
+ dst_set_neighbour(&rt->dst, neigh);
ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
rt->rt6i_dst.plen = 128;
@@ -2407,8 +2414,8 @@ static int rt6_fill_node(struct net *net,
if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
goto nla_put_failure;
- if (rt->dst.neighbour)
- NLA_PUT(skb, RTA_GATEWAY, 16, &rt->dst.neighbour->primary_key);
+ if (dst_get_neighbour(&rt->dst))
+ NLA_PUT(skb, RTA_GATEWAY, 16, &dst_get_neighbour(&rt->dst)->primary_key);
if (rt->dst.dev)
NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);
@@ -2592,6 +2599,7 @@ struct rt6_proc_arg
static int rt6_info_route(struct rt6_info *rt, void *p_arg)
{
struct seq_file *m = p_arg;
+ struct neighbour *n;
seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
@@ -2600,9 +2608,9 @@ static int rt6_info_route(struct rt6_info *rt, void *p_arg)
#else
seq_puts(m, "00000000000000000000000000000000 00 ");
#endif
-
- if (rt->rt6i_nexthop) {
- seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key);
+ n = dst_get_neighbour(&rt->dst);
+ if (n) {
+ seq_printf(m, "%pi6", n->primary_key);
} else {
seq_puts(m, "00000000000000000000000000000000");
}
@@ -2925,9 +2933,9 @@ int __init ip6_route_init(void)
goto xfrm6_init;
ret = -ENOBUFS;
- if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) ||
- __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) ||
- __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL))
+ if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
+ __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
+ __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
goto fib6_rules_init;
ret = register_netdevice_notifier(&ip6_route_dev_notifier);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.