xfrm: dst_entries_init() per-net dst_ops
Remove the dst_entries_init/destroy calls for xfrm4 and xfrm6 dst_ops templates; their dst_entries counters will never be used. Move the xfrm dst_ops initialization from the common xfrm/xfrm_policy.c to xfrm4/xfrm4_policy.c and xfrm6/xfrm6_policy.c, and call dst_entries_init and dst_entries_destroy for each net namespace. The ipv4 and ipv6 xfrms each create dst_ops template, and perform dst_entries_init on the templates. The template values are copied to each net namespace's xfrm.xfrm*_dst_ops. The problem there is the dst_ops pcpuc_entries field is a percpu counter and cannot be used correctly by simply copying it to another object. The result of this is a very subtle bug; changes to the dst entries counter from one net namespace may sometimes get applied to a different net namespace dst entries counter. This is because of how the percpu counter works; it has a main count field as well as a pointer to the percpu variables. Each net namespace maintains its own main count variable, but all point to one set of percpu variables. When any net namespace happens to change one of the percpu variables to outside its small batch range, its count is moved to the net namespace's main count variable. So with multiple net namespaces operating concurrently, the dst_ops entries counter can stray from the actual value that it should be; if counts are consistently moved from one net namespace to another (which my testing showed is likely), then one net namespace winds up with a negative dst_ops count while another winds up with a continually increasing count, eventually reaching its gc_thresh limit, which causes all new traffic on the net namespace to fail with -ENOBUFS. Signed-off-by: Dan Streetman <dan.streetman@canonical.com> Signed-off-by: Dan Streetman <ddstreet@ieee.org> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Dan Streetman
Steffen Klassert
parent
5f6c99e0ab
commit
a8a572a6b5
3 changed files with 75 additions and 62 deletions
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@ -236,7 +236,7 @@ static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
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xfrm_dst_ifdown(dst, dev);
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}
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static struct dst_ops xfrm4_dst_ops = {
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static struct dst_ops xfrm4_dst_ops_template = {
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.family = AF_INET,
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.gc = xfrm4_garbage_collect,
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.update_pmtu = xfrm4_update_pmtu,
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@ -250,7 +250,7 @@ static struct dst_ops xfrm4_dst_ops = {
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static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
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.family = AF_INET,
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.dst_ops = &xfrm4_dst_ops,
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.dst_ops = &xfrm4_dst_ops_template,
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.dst_lookup = xfrm4_dst_lookup,
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.get_saddr = xfrm4_get_saddr,
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.decode_session = _decode_session4,
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@ -272,7 +272,7 @@ static struct ctl_table xfrm4_policy_table[] = {
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{ }
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};
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static int __net_init xfrm4_net_init(struct net *net)
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static int __net_init xfrm4_net_sysctl_init(struct net *net)
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{
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struct ctl_table *table;
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struct ctl_table_header *hdr;
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@ -300,7 +300,7 @@ static int __net_init xfrm4_net_init(struct net *net)
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return -ENOMEM;
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}
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static void __net_exit xfrm4_net_exit(struct net *net)
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static void __net_exit xfrm4_net_sysctl_exit(struct net *net)
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{
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struct ctl_table *table;
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@ -312,12 +312,44 @@ static void __net_exit xfrm4_net_exit(struct net *net)
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if (!net_eq(net, &init_net))
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kfree(table);
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}
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#else /* CONFIG_SYSCTL */
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static int inline xfrm4_net_sysctl_init(struct net *net)
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{
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return 0;
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}
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static void inline xfrm4_net_sysctl_exit(struct net *net)
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{
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}
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#endif
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static int __net_init xfrm4_net_init(struct net *net)
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{
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int ret;
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memcpy(&net->xfrm.xfrm4_dst_ops, &xfrm4_dst_ops_template,
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sizeof(xfrm4_dst_ops_template));
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ret = dst_entries_init(&net->xfrm.xfrm4_dst_ops);
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if (ret)
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return ret;
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ret = xfrm4_net_sysctl_init(net);
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if (ret)
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dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
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return ret;
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}
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static void __net_exit xfrm4_net_exit(struct net *net)
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{
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xfrm4_net_sysctl_exit(net);
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dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
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}
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static struct pernet_operations __net_initdata xfrm4_net_ops = {
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.init = xfrm4_net_init,
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.exit = xfrm4_net_exit,
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};
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#endif
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static void __init xfrm4_policy_init(void)
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{
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@ -326,13 +358,9 @@ static void __init xfrm4_policy_init(void)
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void __init xfrm4_init(void)
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{
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dst_entries_init(&xfrm4_dst_ops);
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xfrm4_state_init();
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xfrm4_policy_init();
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xfrm4_protocol_init();
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#ifdef CONFIG_SYSCTL
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register_pernet_subsys(&xfrm4_net_ops);
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#endif
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}
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@ -281,7 +281,7 @@ static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
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xfrm_dst_ifdown(dst, dev);
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}
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static struct dst_ops xfrm6_dst_ops = {
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static struct dst_ops xfrm6_dst_ops_template = {
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.family = AF_INET6,
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.gc = xfrm6_garbage_collect,
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.update_pmtu = xfrm6_update_pmtu,
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@ -295,7 +295,7 @@ static struct dst_ops xfrm6_dst_ops = {
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static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
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.family = AF_INET6,
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.dst_ops = &xfrm6_dst_ops,
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.dst_ops = &xfrm6_dst_ops_template,
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.dst_lookup = xfrm6_dst_lookup,
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.get_saddr = xfrm6_get_saddr,
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.decode_session = _decode_session6,
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@ -327,7 +327,7 @@ static struct ctl_table xfrm6_policy_table[] = {
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{ }
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};
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static int __net_init xfrm6_net_init(struct net *net)
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static int __net_init xfrm6_net_sysctl_init(struct net *net)
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{
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struct ctl_table *table;
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struct ctl_table_header *hdr;
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@ -355,7 +355,7 @@ static int __net_init xfrm6_net_init(struct net *net)
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return -ENOMEM;
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}
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static void __net_exit xfrm6_net_exit(struct net *net)
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static void __net_exit xfrm6_net_sysctl_exit(struct net *net)
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{
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struct ctl_table *table;
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@ -367,24 +367,52 @@ static void __net_exit xfrm6_net_exit(struct net *net)
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if (!net_eq(net, &init_net))
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kfree(table);
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}
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#else /* CONFIG_SYSCTL */
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static int inline xfrm6_net_sysctl_init(struct net *net)
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{
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return 0;
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}
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static void inline xfrm6_net_sysctl_exit(struct net *net)
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{
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}
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#endif
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static int __net_init xfrm6_net_init(struct net *net)
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{
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int ret;
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memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template,
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sizeof(xfrm6_dst_ops_template));
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ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops);
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if (ret)
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return ret;
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ret = xfrm6_net_sysctl_init(net);
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if (ret)
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dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
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return ret;
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}
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static void __net_exit xfrm6_net_exit(struct net *net)
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{
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xfrm6_net_sysctl_exit(net);
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dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
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}
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static struct pernet_operations xfrm6_net_ops = {
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.init = xfrm6_net_init,
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.exit = xfrm6_net_exit,
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};
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#endif
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int __init xfrm6_init(void)
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{
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int ret;
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dst_entries_init(&xfrm6_dst_ops);
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ret = xfrm6_policy_init();
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if (ret) {
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dst_entries_destroy(&xfrm6_dst_ops);
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if (ret)
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goto out;
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}
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ret = xfrm6_state_init();
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if (ret)
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goto out_policy;
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@ -393,9 +421,7 @@ int __init xfrm6_init(void)
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if (ret)
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goto out_state;
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#ifdef CONFIG_SYSCTL
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register_pernet_subsys(&xfrm6_net_ops);
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#endif
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out:
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return ret;
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out_state:
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@ -407,11 +433,8 @@ int __init xfrm6_init(void)
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void xfrm6_fini(void)
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{
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#ifdef CONFIG_SYSCTL
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unregister_pernet_subsys(&xfrm6_net_ops);
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#endif
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xfrm6_protocol_fini();
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xfrm6_policy_fini();
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xfrm6_state_fini();
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dst_entries_destroy(&xfrm6_dst_ops);
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}
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@ -2807,7 +2807,6 @@ static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
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int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
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{
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struct net *net;
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int err = 0;
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if (unlikely(afinfo == NULL))
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return -EINVAL;
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@ -2838,26 +2837,6 @@ int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
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}
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spin_unlock(&xfrm_policy_afinfo_lock);
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rtnl_lock();
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for_each_net(net) {
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struct dst_ops *xfrm_dst_ops;
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switch (afinfo->family) {
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case AF_INET:
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xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
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break;
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#if IS_ENABLED(CONFIG_IPV6)
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case AF_INET6:
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xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
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break;
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#endif
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default:
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BUG();
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}
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*xfrm_dst_ops = *afinfo->dst_ops;
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}
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rtnl_unlock();
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return err;
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}
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EXPORT_SYMBOL(xfrm_policy_register_afinfo);
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@ -2893,22 +2872,6 @@ int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
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}
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EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
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static void __net_init xfrm_dst_ops_init(struct net *net)
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{
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struct xfrm_policy_afinfo *afinfo;
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rcu_read_lock();
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afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]);
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if (afinfo)
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net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
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#if IS_ENABLED(CONFIG_IPV6)
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afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]);
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if (afinfo)
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net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
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#endif
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rcu_read_unlock();
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}
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static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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@ -3057,7 +3020,6 @@ static int __net_init xfrm_net_init(struct net *net)
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rv = xfrm_policy_init(net);
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if (rv < 0)
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goto out_policy;
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xfrm_dst_ops_init(net);
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rv = xfrm_sysctl_init(net);
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if (rv < 0)
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goto out_sysctl;
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