mirror of https://gitee.com/openkylin/linux.git
net: ip6_gre: fix tunnel metadata device sharing.
Currently ip6gre and ip6erspan share single metadata mode device,
using 'collect_md_tun'. Thus, when doing:
ip link add dev ip6gre11 type ip6gretap external
ip link add dev ip6erspan12 type ip6erspan external
RTNETLINK answers: File exists
simply fails due to the 2nd tries to create the same collect_md_tun.
The patch fixes it by adding a separate collect md tunnel device
for the ip6erspan, 'collect_md_tun_erspan'. As a result, a couple
of places need to refactor/split up in order to distinguish ip6gre
and ip6erspan.
First, move the collect_md check at ip6gre_tunnel_{unlink,link} and
create separate function {ip6gre,ip6ersapn}_tunnel_{link_md,unlink_md}.
Then before link/unlink, make sure the link_md/unlink_md is called.
Finally, a separate ndo_uninit is created for ip6erspan. Tested it
using the samples/bpf/test_tunnel_bpf.sh.
Fixes: ef7baf5e08 ("ip6_gre: add ip6 erspan collect_md mode")
Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu
David S. Miller
parent
d775f26b29
commit
b80d0b93b9
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@ -71,6 +71,7 @@ struct ip6gre_net {
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struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
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struct ip6_tnl __rcu *collect_md_tun;
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struct ip6_tnl __rcu *collect_md_tun_erspan;
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struct net_device *fb_tunnel_dev;
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};
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@ -233,7 +234,12 @@ static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
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if (cand)
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return cand;
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t = rcu_dereference(ign->collect_md_tun);
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if (gre_proto == htons(ETH_P_ERSPAN) ||
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gre_proto == htons(ETH_P_ERSPAN2))
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t = rcu_dereference(ign->collect_md_tun_erspan);
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else
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t = rcu_dereference(ign->collect_md_tun);
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if (t && t->dev->flags & IFF_UP)
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return t;
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@ -262,6 +268,31 @@ static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
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return &ign->tunnels[prio][h];
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}
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static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
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{
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if (t->parms.collect_md)
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rcu_assign_pointer(ign->collect_md_tun, t);
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}
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static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
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{
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if (t->parms.collect_md)
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rcu_assign_pointer(ign->collect_md_tun_erspan, t);
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}
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static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
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{
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if (t->parms.collect_md)
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rcu_assign_pointer(ign->collect_md_tun, NULL);
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}
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static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
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struct ip6_tnl *t)
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{
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if (t->parms.collect_md)
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rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
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}
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static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
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const struct ip6_tnl *t)
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{
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@ -272,9 +303,6 @@ static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
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{
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struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
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if (t->parms.collect_md)
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rcu_assign_pointer(ign->collect_md_tun, t);
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rcu_assign_pointer(t->next, rtnl_dereference(*tp));
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rcu_assign_pointer(*tp, t);
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}
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@ -284,9 +312,6 @@ static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
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struct ip6_tnl __rcu **tp;
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struct ip6_tnl *iter;
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if (t->parms.collect_md)
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rcu_assign_pointer(ign->collect_md_tun, NULL);
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for (tp = ip6gre_bucket(ign, t);
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(iter = rtnl_dereference(*tp)) != NULL;
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tp = &iter->next) {
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@ -375,11 +400,23 @@ static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
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return NULL;
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}
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static void ip6erspan_tunnel_uninit(struct net_device *dev)
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{
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struct ip6_tnl *t = netdev_priv(dev);
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struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
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ip6erspan_tunnel_unlink_md(ign, t);
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ip6gre_tunnel_unlink(ign, t);
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dst_cache_reset(&t->dst_cache);
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dev_put(dev);
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}
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static void ip6gre_tunnel_uninit(struct net_device *dev)
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{
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struct ip6_tnl *t = netdev_priv(dev);
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struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
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ip6gre_tunnel_unlink_md(ign, t);
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ip6gre_tunnel_unlink(ign, t);
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dst_cache_reset(&t->dst_cache);
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dev_put(dev);
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@ -1806,7 +1843,7 @@ static int ip6erspan_tap_init(struct net_device *dev)
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static const struct net_device_ops ip6erspan_netdev_ops = {
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.ndo_init = ip6erspan_tap_init,
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.ndo_uninit = ip6gre_tunnel_uninit,
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.ndo_uninit = ip6erspan_tunnel_uninit,
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.ndo_start_xmit = ip6erspan_tunnel_xmit,
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_validate_addr = eth_validate_addr,
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@ -1875,8 +1912,6 @@ static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
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struct netlink_ext_ack *extack)
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{
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struct ip6_tnl *nt;
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struct net *net = dev_net(dev);
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struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
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struct ip_tunnel_encap ipencap;
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int err;
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@ -1889,16 +1924,6 @@ static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
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return err;
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}
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ip6gre_netlink_parms(data, &nt->parms);
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if (nt->parms.collect_md) {
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if (rtnl_dereference(ign->collect_md_tun))
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return -EEXIST;
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} else {
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if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
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return -EEXIST;
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}
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if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
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eth_hw_addr_random(dev);
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@ -1922,12 +1947,26 @@ static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[],
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struct netlink_ext_ack *extack)
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{
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int err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
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struct ip6_tnl *nt = netdev_priv(dev);
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struct net *net = dev_net(dev);
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struct ip6gre_net *ign;
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int err;
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ip6gre_netlink_parms(data, &nt->parms);
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ign = net_generic(net, ip6gre_net_id);
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if (nt->parms.collect_md) {
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if (rtnl_dereference(ign->collect_md_tun))
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return -EEXIST;
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} else {
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if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
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return -EEXIST;
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}
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err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
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if (!err) {
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ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
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ip6gre_tunnel_link_md(ign, nt);
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ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
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}
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return err;
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@ -1979,8 +2018,10 @@ static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
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if (IS_ERR(t))
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return PTR_ERR(t);
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ip6gre_tunnel_unlink_md(ign, t);
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ip6gre_tunnel_unlink(ign, t);
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ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
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ip6gre_tunnel_link_md(ign, t);
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ip6gre_tunnel_link(ign, t);
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return 0;
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}
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@ -2134,12 +2175,26 @@ static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[],
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struct netlink_ext_ack *extack)
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{
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int err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
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struct ip6_tnl *nt = netdev_priv(dev);
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struct net *net = dev_net(dev);
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struct ip6gre_net *ign;
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int err;
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ip6gre_netlink_parms(data, &nt->parms);
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ign = net_generic(net, ip6gre_net_id);
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if (nt->parms.collect_md) {
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if (rtnl_dereference(ign->collect_md_tun_erspan))
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return -EEXIST;
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} else {
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if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
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return -EEXIST;
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}
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err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
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if (!err) {
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ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
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ip6erspan_tunnel_link_md(ign, nt);
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ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
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}
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return err;
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@ -2171,8 +2226,10 @@ static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
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if (IS_ERR(t))
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return PTR_ERR(t);
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ip6gre_tunnel_unlink_md(ign, t);
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ip6gre_tunnel_unlink(ign, t);
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ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
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ip6erspan_tunnel_link_md(ign, t);
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ip6gre_tunnel_link(ign, t);
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return 0;
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}
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