int flags)
{
struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
- 0, DST_OBSOLETE_FORCE_CHK, flags);
+ 1, DST_OBSOLETE_FORCE_CHK, flags);
if (rt)
rt6_info_init(rt);
*p = NULL;
}
} else {
- dst_destroy((struct dst_entry *)rt);
+ dst_release(&rt->dst);
+ if (!(flags & DST_NOCACHE))
+ dst_destroy((struct dst_entry *)rt);
return NULL;
}
}
EXPORT_SYMBOL(rt6_lookup);
/* ip6_ins_rt is called with FREE table->tb6_lock.
- It takes new route entry, the addition fails by any reason the
- route is freed. In any case, if caller does not hold it, it may
- be destroyed.
+ * It takes new route entry, the addition fails by any reason the
+ * route is released.
+ * Caller must hold dst before calling it.
*/
static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
- struct mx6_config *mxc)
+ struct mx6_config *mxc,
+ struct netlink_ext_ack *extack)
{
int err;
struct fib6_table *table;
table = rt->rt6i_table;
write_lock_bh(&table->tb6_lock);
- err = fib6_add(&table->tb6_root, rt, info, mxc);
+ err = fib6_add(&table->tb6_root, rt, info, mxc, extack);
write_unlock_bh(&table->tb6_lock);
return err;
struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
struct mx6_config mxc = { .mx = NULL, };
- return __ip6_ins_rt(rt, &info, &mxc);
+ /* Hold dst to account for the reference from the fib6 tree */
+ dst_hold(&rt->dst);
+ return __ip6_ins_rt(rt, &info, &mxc, NULL);
}
static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
prev = cmpxchg(p, NULL, pcpu_rt);
if (prev) {
/* If someone did it before us, return prev instead */
+ dst_release(&pcpu_rt->dst);
dst_destroy(&pcpu_rt->dst);
pcpu_rt = prev;
}
* since rt is going away anyway. The next
* dst_check() will trigger a re-lookup.
*/
+ dst_release(&pcpu_rt->dst);
dst_destroy(&pcpu_rt->dst);
pcpu_rt = rt;
}
uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
dst_release(&rt->dst);
- if (uncached_rt)
+ if (uncached_rt) {
+ /* Uncached_rt's refcnt is taken during ip6_rt_cache_alloc()
+ * No need for another dst_hold()
+ */
rt6_uncached_list_add(uncached_rt);
- else
+ } else {
uncached_rt = net->ipv6.ip6_null_entry;
-
- dst_hold(&uncached_rt->dst);
+ dst_hold(&uncached_rt->dst);
+ }
trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
return uncached_rt;
struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
{
struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
+ struct net_device *loopback_dev = net->loopback_dev;
struct dst_entry *new = NULL;
- rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
+
+ rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
+ DST_OBSOLETE_NONE, 0);
if (rt) {
rt6_info_init(rt);
new->output = dst_discard_out;
dst_copy_metrics(new, &ort->dst);
- rt->rt6i_idev = ort->rt6i_idev;
- if (rt->rt6i_idev)
- in6_dev_hold(rt->rt6i_idev);
+ rt->rt6i_idev = in6_dev_get(loopback_dev);
rt->rt6i_gateway = ort->rt6i_gateway;
rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
rt->rt6i_metric = 0;
rt = (struct rt6_info *) skb_dst(skb);
if (rt) {
if (rt->rt6i_flags & RTF_CACHE) {
- dst_hold(&rt->dst);
- ip6_del_rt(rt);
+ if (dst_hold_safe(&rt->dst))
+ ip6_del_rt(rt);
} else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
rt->rt6i_node->fn_sernum = -1;
}
* invalidate the sk->sk_dst_cache.
*/
ip6_ins_rt(nrt6);
+ /* Release the reference taken in
+ * ip6_rt_cache_alloc()
+ */
+ dst_release(&nrt6->dst);
}
}
}
rt->dst.flags |= DST_HOST;
rt->dst.output = ip6_output;
- atomic_set(&rt->dst.__refcnt, 1);
rt->rt6i_gateway = fl6->daddr;
rt->rt6i_dst.addr = fl6->daddr;
rt->rt6i_dst.plen = 128;
return rt;
}
-static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
+static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
+ struct netlink_ext_ack *extack)
{
struct net *net = cfg->fc_nlinfo.nl_net;
struct rt6_info *rt = NULL;
int err = -EINVAL;
/* RTF_PCPU is an internal flag; can not be set by userspace */
- if (cfg->fc_flags & RTF_PCPU)
+ if (cfg->fc_flags & RTF_PCPU) {
+ NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
goto out;
+ }
- if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
+ if (cfg->fc_dst_len > 128) {
+ NL_SET_ERR_MSG(extack, "Invalid prefix length");
+ goto out;
+ }
+ if (cfg->fc_src_len > 128) {
+ NL_SET_ERR_MSG(extack, "Invalid source address length");
goto out;
+ }
#ifndef CONFIG_IPV6_SUBTREES
- if (cfg->fc_src_len)
+ if (cfg->fc_src_len) {
+ NL_SET_ERR_MSG(extack,
+ "Specifying source address requires IPV6_SUBTREES to be enabled");
goto out;
+ }
#endif
if (cfg->fc_ifindex) {
err = -ENODEV;
err = lwtunnel_build_state(cfg->fc_encap_type,
cfg->fc_encap, AF_INET6, cfg,
- &lwtstate);
+ &lwtstate, extack);
if (err)
goto out;
rt->dst.lwtstate = lwtstate_get(lwtstate);
err = -EINVAL;
if (ipv6_chk_addr_and_flags(net, gw_addr,
gwa_type & IPV6_ADDR_LINKLOCAL ?
- dev : NULL, 0, 0))
+ dev : NULL, 0, 0)) {
+ NL_SET_ERR_MSG(extack, "Invalid gateway address");
goto out;
-
+ }
rt->rt6i_gateway = *gw_addr;
if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
addressing
*/
if (!(gwa_type & (IPV6_ADDR_UNICAST |
- IPV6_ADDR_MAPPED)))
+ IPV6_ADDR_MAPPED))) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid gateway address");
goto out;
+ }
if (cfg->fc_table) {
grt = ip6_nh_lookup_table(net, cfg, gw_addr);
goto out;
}
err = -EINVAL;
- if (!dev || (dev->flags & IFF_LOOPBACK))
+ if (!dev) {
+ NL_SET_ERR_MSG(extack, "Egress device not specified");
+ goto out;
+ } else if (dev->flags & IFF_LOOPBACK) {
+ NL_SET_ERR_MSG(extack,
+ "Egress device can not be loopback device for this route");
goto out;
+ }
}
err = -ENODEV;
if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
+ NL_SET_ERR_MSG(extack, "Invalid source address");
err = -EINVAL;
goto out;
}
dev_put(dev);
if (idev)
in6_dev_put(idev);
- if (rt)
+ if (rt) {
+ dst_release(&rt->dst);
dst_free(&rt->dst);
+ }
return ERR_PTR(err);
}
-int ip6_route_add(struct fib6_config *cfg)
+int ip6_route_add(struct fib6_config *cfg,
+ struct netlink_ext_ack *extack)
{
struct mx6_config mxc = { .mx = NULL, };
struct rt6_info *rt;
int err;
- rt = ip6_route_info_create(cfg);
+ rt = ip6_route_info_create(cfg, extack);
if (IS_ERR(rt)) {
err = PTR_ERR(rt);
rt = NULL;
if (err)
goto out;
- err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
+ err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc, extack);
kfree(mxc.mx);
return err;
out:
- if (rt)
+ if (rt) {
+ dst_release(&rt->dst);
dst_free(&rt->dst);
+ }
return err;
}
return err;
}
-static int ip6_route_del(struct fib6_config *cfg)
+static int ip6_route_del(struct fib6_config *cfg,
+ struct netlink_ext_ack *extack)
{
struct fib6_table *table;
struct fib6_node *fn;
int err = -ESRCH;
table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
- if (!table)
+ if (!table) {
+ NL_SET_ERR_MSG(extack, "FIB table does not exist");
return err;
+ }
read_lock_bh(&table->tb6_lock);
nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
if (ip6_ins_rt(nrt))
- goto out;
+ goto out_release;
netevent.old = &rt->dst;
netevent.new = &nrt->dst;
ip6_del_rt(rt);
}
+out_release:
+ /* Release the reference taken in
+ * ip6_rt_cache_alloc()
+ */
+ dst_release(&nrt->dst);
+
out:
neigh_release(neigh);
}
if (!prefixlen)
cfg.fc_flags |= RTF_DEFAULT;
- ip6_route_add(&cfg);
+ ip6_route_add(&cfg, NULL);
return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
}
cfg.fc_gateway = *gwaddr;
- if (!ip6_route_add(&cfg)) {
+ if (!ip6_route_add(&cfg, NULL)) {
struct fib6_table *table;
table = fib6_get_table(dev_net(dev), cfg.fc_table);
rtnl_lock();
switch (cmd) {
case SIOCADDRT:
- err = ip6_route_add(&cfg);
+ err = ip6_route_add(&cfg, NULL);
break;
case SIOCDELRT:
- err = ip6_route_del(&cfg);
+ err = ip6_route_del(&cfg, NULL);
break;
default:
err = -EINVAL;
rt->rt6i_table = fib6_get_table(net, tb_id);
rt->dst.flags |= DST_NOCACHE;
- atomic_set(&rt->dst.__refcnt, 1);
-
return rt;
}
if ((rt->dst.dev == dev || !dev) &&
rt != adn->net->ipv6.ip6_null_entry &&
(rt->rt6i_nsiblings == 0 ||
+ (dev && netdev_unregistering(dev)) ||
!rt->rt6i_idev->cnf.ignore_routes_with_linkdown))
return -1;
};
static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
- struct fib6_config *cfg)
+ struct fib6_config *cfg,
+ struct netlink_ext_ack *extack)
{
struct rtmsg *rtm;
struct nlattr *tb[RTA_MAX+1];
cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
- cfg->fc_mp_len);
+ cfg->fc_mp_len, extack);
if (err < 0)
goto errout;
}
if (tb[RTA_ENCAP_TYPE]) {
cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
- err = lwtunnel_valid_encap_type(cfg->fc_encap_type);
+ err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
if (err < 0)
goto errout;
}
inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
}
-static int ip6_route_multipath_add(struct fib6_config *cfg)
+static int ip6_route_multipath_add(struct fib6_config *cfg,
+ struct netlink_ext_ack *extack)
{
struct rt6_info *rt_notif = NULL, *rt_last = NULL;
struct nl_info *info = &cfg->fc_nlinfo;
r_cfg.fc_encap_type = nla_get_u16(nla);
}
- rt = ip6_route_info_create(&r_cfg);
+ rt = ip6_route_info_create(&r_cfg, extack);
if (IS_ERR(rt)) {
err = PTR_ERR(rt);
rt = NULL;
err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
if (err) {
+ dst_release(&rt->dst);
dst_free(&rt->dst);
goto cleanup;
}
err_nh = NULL;
list_for_each_entry(nh, &rt6_nh_list, next) {
rt_last = nh->rt6_info;
- err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc);
+ err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc, extack);
/* save reference to first route for notification */
if (!rt_notif && !err)
rt_notif = nh->rt6_info;
list_for_each_entry(nh, &rt6_nh_list, next) {
if (err_nh == nh)
break;
- ip6_route_del(&nh->r_cfg);
+ ip6_route_del(&nh->r_cfg, extack);
}
cleanup:
list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
- if (nh->rt6_info)
+ if (nh->rt6_info) {
+ dst_release(&nh->rt6_info->dst);
dst_free(&nh->rt6_info->dst);
+ }
kfree(nh->mxc.mx);
list_del(&nh->next);
kfree(nh);
return err;
}
-static int ip6_route_multipath_del(struct fib6_config *cfg)
+static int ip6_route_multipath_del(struct fib6_config *cfg,
+ struct netlink_ext_ack *extack)
{
struct fib6_config r_cfg;
struct rtnexthop *rtnh;
r_cfg.fc_flags |= RTF_GATEWAY;
}
}
- err = ip6_route_del(&r_cfg);
+ err = ip6_route_del(&r_cfg, extack);
if (err)
last_err = err;
struct fib6_config cfg;
int err;
- err = rtm_to_fib6_config(skb, nlh, &cfg);
+ err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
if (err < 0)
return err;
if (cfg.fc_mp)
- return ip6_route_multipath_del(&cfg);
+ return ip6_route_multipath_del(&cfg, extack);
else {
cfg.fc_delete_all_nh = 1;
- return ip6_route_del(&cfg);
+ return ip6_route_del(&cfg, extack);
}
}
struct fib6_config cfg;
int err;
- err = rtm_to_fib6_config(skb, nlh, &cfg);
+ err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
if (err < 0)
return err;
if (cfg.fc_mp)
- return ip6_route_multipath_add(&cfg);
+ return ip6_route_multipath_add(&cfg, extack);
else
- return ip6_route_add(&cfg);
+ return ip6_route_add(&cfg, extack);
}
static size_t rt6_nlmsg_size(struct rt6_info *rt)
{
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[RTA_MAX+1];
+ int err, iif = 0, oif = 0;
+ struct dst_entry *dst;
struct rt6_info *rt;
struct sk_buff *skb;
struct rtmsg *rtm;
struct flowi6 fl6;
- int err, iif = 0, oif = 0;
+ bool fibmatch;
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
extack);
memset(&fl6, 0, sizeof(fl6));
rtm = nlmsg_data(nlh);
fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
+ fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
if (tb[RTA_SRC]) {
if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
if (!ipv6_addr_any(&fl6.saddr))
flags |= RT6_LOOKUP_F_HAS_SADDR;
- rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
- flags);
+ if (!fibmatch)
+ dst = ip6_route_input_lookup(net, dev, &fl6, flags);
} else {
fl6.flowi6_oif = oif;
- rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
+ if (!fibmatch)
+ dst = ip6_route_output(net, NULL, &fl6);
+ }
+
+ if (fibmatch)
+ dst = ip6_route_lookup(net, &fl6, 0);
+
+ rt = container_of(dst, struct rt6_info, dst);
+ if (rt->dst.error) {
+ err = rt->dst.error;
+ ip6_rt_put(rt);
+ goto errout;
}
if (rt == net->ipv6.ip6_null_entry) {
}
skb_dst_set(skb, &rt->dst);
-
- err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
- RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
- nlh->nlmsg_seq, 0);
+ if (fibmatch)
+ err = rt6_fill_node(net, skb, rt, NULL, NULL, iif,
+ RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, 0);
+ else
+ err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
+ RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, 0);
if (err < 0) {
kfree_skb(skb);
goto errout;
projects / linux-block.git / blobdiff