Commit 244b7f43 authored by David S. Miller's avatar David S. Miller

Merge branch 'ip6tunnel_dst'

Martin KaFai Lau says:

====================
ipv6: Fix dst_entry refcnt bugs in ip6_tunnel

v4:
- Fix a compilation error in patch 5 when CONFIG_LOCKDEP is turned on and
  re-test it

v3:
- Merge a 'if else if' test in patch 4
- Use rcu_dereference_protected in patch 5 to fix a sparse check when
  CONFIG_SPARSE_RCU_POINTER is enabled

v2:
- Add patch 4 and 5 to remove the spinlock

v1:
This patch series is to fix the dst refcnt bugs in ip6_tunnel.

Patch 1 and 2 are the prep works.  Patch 3 is the fix.

I can reproduce the bug by adding and removing the ip6gre tunnel
while running a super_netperf TCP_CRR test.  I get the following
trace by adding WARN_ON_ONCE(newrefcnt < 0) to dst_release():

[  312.760432] ------------[ cut here ]------------
[  312.774664] WARNING: CPU: 2 PID: 10263 at net/core/dst.c:288 dst_release+0xf3/0x100()
[  312.776041] Modules linked in: k10temp coretemp hwmon ip6_gre ip6_tunnel tunnel6 ipmi_devintf ipmi_ms\
ghandler ip6table_filter ip6_tables xt_NFLOG nfnetlink_log nfnetlink xt_comment xt_statistic iptable_fil\
ter ip_tables x_tables nfsv3 nfs_acl nfs fscache lockd grace mptctl netconsole autofs4 rpcsec_gss_krb5 a\
uth_rpcgss oid_registry sunrpc ipv6 dm_mod loop iTCO_wdt iTCO_vendor_support serio_raw rtc_cmos pcspkr i\
2c_i801 i2c_core lpc_ich mfd_core ehci_pci ehci_hcd e1000e mlx4_en ptp pps_core vxlan udp_tunnel ip6_udp\
_tunnel mlx4_core sg button ext3 jbd mpt2sas raid_class
[  312.785302] CPU: 2 PID: 10263 Comm: netperf Not tainted 4.2.0-rc8-00046-g4db9b63-dirty #15
[  312.791695] Hardware name: Quanta Freedom /Windmill-EP, BIOS F03_3B04 09/12/2013
[  312.792965]  ffffffff819dca2c ffff8811dfbdf6f8 ffffffff816537de ffff88123788fdb8
[  312.794263]  0000000000000000 ffff8811dfbdf738 ffffffff81052646 ffff8811dfbdf768
[  312.795593]  ffff881203a98180 00000000ffffffff ffff88242927a000 ffff88120a2532e0
[  312.796946] Call Trace:
[  312.797380]  [<ffffffff816537de>] dump_stack+0x45/0x57
[  312.798288]  [<ffffffff81052646>] warn_slowpath_common+0x86/0xc0
[  312.799699]  [<ffffffff8105273a>] warn_slowpath_null+0x1a/0x20
[  312.800852]  [<ffffffff8159f9b3>] dst_release+0xf3/0x100
[  312.801834]  [<ffffffffa03f1308>] ip6_tnl_dst_store+0x48/0x70 [ip6_tunnel]
[  312.803738]  [<ffffffffa03fd0b6>] ip6gre_xmit2+0x536/0x720 [ip6_gre]
[  312.804774]  [<ffffffffa03fd40a>] ip6gre_tunnel_xmit+0x16a/0x410 [ip6_gre]
[  312.805986]  [<ffffffff8159934b>] dev_hard_start_xmit+0x23b/0x390
[  312.808810]  [<ffffffff815a2f5f>] ? neigh_destroy+0xef/0x140
[  312.809843]  [<ffffffff81599a6c>] __dev_queue_xmit+0x48c/0x4f0
[  312.813931]  [<ffffffff81599ae3>] dev_queue_xmit_sk+0x13/0x20
[  312.814993]  [<ffffffff815a0832>] neigh_direct_output+0x12/0x20
[  312.817448]  [<ffffffffa021d633>] ip6_finish_output2+0x183/0x460 [ipv6]
[  312.818762]  [<ffffffff81306fc5>] ? find_next_bit+0x15/0x20
[  312.819671]  [<ffffffffa021fd79>] ip6_finish_output+0x89/0xe0 [ipv6]
[  312.820720]  [<ffffffffa021fe14>] ip6_output+0x44/0xe0 [ipv6]
[  312.821762]  [<ffffffff815c8809>] ? nf_hook_slow+0x69/0xc0
[  312.823123]  [<ffffffffa021d232>] ip6_xmit+0x242/0x4c0 [ipv6]
[  312.824073]  [<ffffffffa021c9f0>] ? ac6_proc_exit+0x20/0x20 [ipv6]
[  312.825116]  [<ffffffffa024c751>] inet6_csk_xmit+0x61/0xa0 [ipv6]
[  312.826127]  [<ffffffff815eb590>] tcp_transmit_skb+0x4f0/0x9b0
[  312.827441]  [<ffffffff815ed267>] tcp_connect+0x637/0x7a0
[  312.828327]  [<ffffffffa0245906>] tcp_v6_connect+0x2d6/0x550 [ipv6]
[  312.829581]  [<ffffffff81606f05>] __inet_stream_connect+0x95/0x2f0
[  312.830600]  [<ffffffff810ae13a>] ? hrtimer_try_to_cancel+0x1a/0xf0
[  312.833456]  [<ffffffff812fba19>] ? timerqueue_add+0x59/0xb0
[  312.834407]  [<ffffffff81607198>] inet_stream_connect+0x38/0x50
[  312.835886]  [<ffffffff8157cb17>] SYSC_connect+0xb7/0xf0
[  312.840035]  [<ffffffff810af6d3>] ? do_setitimer+0x1b3/0x200
[  312.840983]  [<ffffffff810af75a>] ? alarm_setitimer+0x3a/0x70
[  312.841941]  [<ffffffff8157d7ae>] SyS_connect+0xe/0x10
[  312.842818]  [<ffffffff81659297>] entry_SYSCALL_64_fastpath+0x12/0x6a
[  312.844206] ---[ end trace 43f3ecd86c3b1313 ]---
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents e8684c88 70da5b5c
......@@ -32,6 +32,12 @@ struct __ip6_tnl_parm {
__be32 o_key;
};
struct ip6_tnl_dst {
seqlock_t lock;
struct dst_entry __rcu *dst;
u32 cookie;
};
/* IPv6 tunnel */
struct ip6_tnl {
struct ip6_tnl __rcu *next; /* next tunnel in list */
......@@ -39,8 +45,7 @@ struct ip6_tnl {
struct net *net; /* netns for packet i/o */
struct __ip6_tnl_parm parms; /* tunnel configuration parameters */
struct flowi fl; /* flowi template for xmit */
struct dst_entry *dst_cache; /* cached dst */
u32 dst_cookie;
struct ip6_tnl_dst __percpu *dst_cache; /* cached dst */
int err_count;
unsigned long err_time;
......@@ -60,9 +65,11 @@ struct ipv6_tlv_tnl_enc_lim {
__u8 encap_limit; /* tunnel encapsulation limit */
} __packed;
struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t);
struct dst_entry *ip6_tnl_dst_get(struct ip6_tnl *t);
int ip6_tnl_dst_init(struct ip6_tnl *t);
void ip6_tnl_dst_destroy(struct ip6_tnl *t);
void ip6_tnl_dst_reset(struct ip6_tnl *t);
void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst);
void ip6_tnl_dst_set(struct ip6_tnl *t, struct dst_entry *dst);
int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
const struct in6_addr *raddr);
int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
......
......@@ -5127,13 +5127,12 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
ifp->idev->dev, 0, 0);
if (rt && ip6_del_rt(rt))
dst_free(&rt->dst);
if (rt)
ip6_del_rt(rt);
}
dst_hold(&ifp->rt->dst);
if (ip6_del_rt(ifp->rt))
dst_free(&ifp->rt->dst);
ip6_del_rt(ifp->rt);
rt_genid_bump_ipv6(net);
break;
......
......@@ -155,6 +155,11 @@ static void node_free(struct fib6_node *fn)
kmem_cache_free(fib6_node_kmem, fn);
}
static void rt6_rcu_free(struct rt6_info *rt)
{
call_rcu(&rt->dst.rcu_head, dst_rcu_free);
}
static void rt6_free_pcpu(struct rt6_info *non_pcpu_rt)
{
int cpu;
......@@ -169,7 +174,7 @@ static void rt6_free_pcpu(struct rt6_info *non_pcpu_rt)
ppcpu_rt = per_cpu_ptr(non_pcpu_rt->rt6i_pcpu, cpu);
pcpu_rt = *ppcpu_rt;
if (pcpu_rt) {
dst_free(&pcpu_rt->dst);
rt6_rcu_free(pcpu_rt);
*ppcpu_rt = NULL;
}
}
......@@ -181,7 +186,7 @@ static void rt6_release(struct rt6_info *rt)
{
if (atomic_dec_and_test(&rt->rt6i_ref)) {
rt6_free_pcpu(rt);
dst_free(&rt->dst);
rt6_rcu_free(rt);
}
}
......@@ -933,6 +938,10 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
int replace_required = 0;
int sernum = fib6_new_sernum(info->nl_net);
if (WARN_ON_ONCE((rt->dst.flags & DST_NOCACHE) &&
!atomic_read(&rt->dst.__refcnt)))
return -EINVAL;
if (info->nlh) {
if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
allow_create = 0;
......@@ -1025,6 +1034,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
fib6_start_gc(info->nl_net, rt);
if (!(rt->rt6i_flags & RTF_CACHE))
fib6_prune_clones(info->nl_net, pn);
rt->dst.flags &= ~DST_NOCACHE;
}
out:
......@@ -1049,6 +1059,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
atomic_inc(&pn->leaf->rt6i_ref);
}
#endif
if (!(rt->dst.flags & DST_NOCACHE))
dst_free(&rt->dst);
}
return err;
......@@ -1060,6 +1071,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
st_failure:
if (fn && !(fn->fn_flags & (RTN_RTINFO|RTN_ROOT)))
fib6_repair_tree(info->nl_net, fn);
if (!(rt->dst.flags & DST_NOCACHE))
dst_free(&rt->dst);
return err;
#endif
......
......@@ -634,20 +634,20 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
}
if (!fl6->flowi6_mark)
dst = ip6_tnl_dst_check(tunnel);
dst = ip6_tnl_dst_get(tunnel);
if (!dst) {
ndst = ip6_route_output(net, NULL, fl6);
dst = ip6_route_output(net, NULL, fl6);
if (ndst->error)
if (dst->error)
goto tx_err_link_failure;
ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
if (IS_ERR(ndst)) {
err = PTR_ERR(ndst);
ndst = NULL;
dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
if (IS_ERR(dst)) {
err = PTR_ERR(dst);
dst = NULL;
goto tx_err_link_failure;
}
dst = ndst;
ndst = dst;
}
tdev = dst->dev;
......@@ -702,12 +702,9 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
skb = new_skb;
}
if (fl6->flowi6_mark) {
if (!fl6->flowi6_mark && ndst)
ip6_tnl_dst_set(tunnel, ndst);
skb_dst_set(skb, dst);
ndst = NULL;
} else {
skb_dst_set_noref(skb, dst);
}
proto = NEXTHDR_GRE;
if (encap_limit >= 0) {
......@@ -762,14 +759,12 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
skb_set_inner_protocol(skb, protocol);
ip6tunnel_xmit(NULL, skb, dev);
if (ndst)
ip6_tnl_dst_store(tunnel, ndst);
return 0;
tx_err_link_failure:
stats->tx_carrier_errors++;
dst_link_failure(skb);
tx_err_dst_release:
dst_release(ndst);
dst_release(dst);
return err;
}
......@@ -1223,6 +1218,9 @@ static const struct net_device_ops ip6gre_netdev_ops = {
static void ip6gre_dev_free(struct net_device *dev)
{
struct ip6_tnl *t = netdev_priv(dev);
ip6_tnl_dst_destroy(t);
free_percpu(dev->tstats);
free_netdev(dev);
}
......@@ -1245,9 +1243,10 @@ static void ip6gre_tunnel_setup(struct net_device *dev)
netif_keep_dst(dev);
}
static int ip6gre_tunnel_init(struct net_device *dev)
static int ip6gre_tunnel_init_common(struct net_device *dev)
{
struct ip6_tnl *tunnel;
int ret;
tunnel = netdev_priv(dev);
......@@ -1255,16 +1254,37 @@ static int ip6gre_tunnel_init(struct net_device *dev)
tunnel->net = dev_net(dev);
strcpy(tunnel->parms.name, dev->name);
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
ret = ip6_tnl_dst_init(tunnel);
if (ret) {
free_percpu(dev->tstats);
dev->tstats = NULL;
return ret;
}
return 0;
}
static int ip6gre_tunnel_init(struct net_device *dev)
{
struct ip6_tnl *tunnel;
int ret;
ret = ip6gre_tunnel_init_common(dev);
if (ret)
return ret;
tunnel = netdev_priv(dev);
memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
if (ipv6_addr_any(&tunnel->parms.raddr))
dev->header_ops = &ip6gre_header_ops;
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
return 0;
}
......@@ -1460,19 +1480,16 @@ static void ip6gre_netlink_parms(struct nlattr *data[],
static int ip6gre_tap_init(struct net_device *dev)
{
struct ip6_tnl *tunnel;
int ret;
tunnel = netdev_priv(dev);
ret = ip6gre_tunnel_init_common(dev);
if (ret)
return ret;
tunnel->dev = dev;
tunnel->net = dev_net(dev);
strcpy(tunnel->parms.name, dev->name);
tunnel = netdev_priv(dev);
ip6gre_tnl_link_config(tunnel, 1);
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
return 0;
}
......
......@@ -126,36 +126,92 @@ static struct net_device_stats *ip6_get_stats(struct net_device *dev)
* Locking : hash tables are protected by RCU and RTNL
*/
struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
static void ip6_tnl_per_cpu_dst_set(struct ip6_tnl_dst *idst,
struct dst_entry *dst)
{
struct dst_entry *dst = t->dst_cache;
write_seqlock_bh(&idst->lock);
dst_release(rcu_dereference_protected(
idst->dst,
lockdep_is_held(&idst->lock.lock)));
if (dst) {
dst_hold(dst);
idst->cookie = rt6_get_cookie((struct rt6_info *)dst);
} else {
idst->cookie = 0;
}
rcu_assign_pointer(idst->dst, dst);
write_sequnlock_bh(&idst->lock);
}
struct dst_entry *ip6_tnl_dst_get(struct ip6_tnl *t)
{
struct ip6_tnl_dst *idst;
struct dst_entry *dst;
unsigned int seq;
u32 cookie;
idst = raw_cpu_ptr(t->dst_cache);
rcu_read_lock();
do {
seq = read_seqbegin(&idst->lock);
dst = rcu_dereference(idst->dst);
cookie = idst->cookie;
} while (read_seqretry(&idst->lock, seq));
if (dst && !atomic_inc_not_zero(&dst->__refcnt))
dst = NULL;
rcu_read_unlock();
if (dst && dst->obsolete &&
!dst->ops->check(dst, t->dst_cookie)) {
t->dst_cache = NULL;
if (dst && dst->obsolete && !dst->ops->check(dst, cookie)) {
ip6_tnl_per_cpu_dst_set(idst, NULL);
dst_release(dst);
return NULL;
dst = NULL;
}
return dst;
}
EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
EXPORT_SYMBOL_GPL(ip6_tnl_dst_get);
void ip6_tnl_dst_reset(struct ip6_tnl *t)
{
dst_release(t->dst_cache);
t->dst_cache = NULL;
int i;
for_each_possible_cpu(i)
ip6_tnl_per_cpu_dst_set(raw_cpu_ptr(t->dst_cache), NULL);
}
EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
void ip6_tnl_dst_set(struct ip6_tnl *t, struct dst_entry *dst)
{
ip6_tnl_per_cpu_dst_set(raw_cpu_ptr(t->dst_cache), dst);
}
EXPORT_SYMBOL_GPL(ip6_tnl_dst_set);
void ip6_tnl_dst_destroy(struct ip6_tnl *t)
{
if (!t->dst_cache)
return;
ip6_tnl_dst_reset(t);
free_percpu(t->dst_cache);
}
EXPORT_SYMBOL_GPL(ip6_tnl_dst_destroy);
int ip6_tnl_dst_init(struct ip6_tnl *t)
{
struct rt6_info *rt = (struct rt6_info *) dst;
t->dst_cookie = rt6_get_cookie(rt);
dst_release(t->dst_cache);
t->dst_cache = dst;
int i;
t->dst_cache = alloc_percpu(struct ip6_tnl_dst);
if (!t->dst_cache)
return -ENOMEM;
for_each_possible_cpu(i)
seqlock_init(&per_cpu_ptr(t->dst_cache, i)->lock);
return 0;
}
EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
EXPORT_SYMBOL_GPL(ip6_tnl_dst_init);
/**
* ip6_tnl_lookup - fetch tunnel matching the end-point addresses
......@@ -271,6 +327,9 @@ ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
static void ip6_dev_free(struct net_device *dev)
{
struct ip6_tnl *t = netdev_priv(dev);
ip6_tnl_dst_destroy(t);
free_percpu(dev->tstats);
free_netdev(dev);
}
......@@ -1010,23 +1069,23 @@ static int ip6_tnl_xmit2(struct sk_buff *skb,
memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
neigh_release(neigh);
} else if (!fl6->flowi6_mark)
dst = ip6_tnl_dst_check(t);
dst = ip6_tnl_dst_get(t);
if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
goto tx_err_link_failure;
if (!dst) {
ndst = ip6_route_output(net, NULL, fl6);
dst = ip6_route_output(net, NULL, fl6);
if (ndst->error)
if (dst->error)
goto tx_err_link_failure;
ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
if (IS_ERR(ndst)) {
err = PTR_ERR(ndst);
ndst = NULL;
dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
if (IS_ERR(dst)) {
err = PTR_ERR(dst);
dst = NULL;
goto tx_err_link_failure;
}
dst = ndst;
ndst = dst;
}
tdev = dst->dev;
......@@ -1072,12 +1131,11 @@ static int ip6_tnl_xmit2(struct sk_buff *skb,
consume_skb(skb);
skb = new_skb;
}
if (fl6->flowi6_mark) {
if (!fl6->flowi6_mark && ndst)
ip6_tnl_dst_set(t, ndst);
skb_dst_set(skb, dst);
ndst = NULL;
} else {
skb_dst_set_noref(skb, dst);
}
skb->transport_header = skb->network_header;
proto = fl6->flowi6_proto;
......@@ -1101,14 +1159,12 @@ static int ip6_tnl_xmit2(struct sk_buff *skb,
ipv6h->saddr = fl6->saddr;
ipv6h->daddr = fl6->daddr;
ip6tunnel_xmit(NULL, skb, dev);
if (ndst)
ip6_tnl_dst_store(t, ndst);
return 0;
tx_err_link_failure:
stats->tx_carrier_errors++;
dst_link_failure(skb);
tx_err_dst_release:
dst_release(ndst);
dst_release(dst);
return err;
}
......@@ -1573,12 +1629,21 @@ static inline int
ip6_tnl_dev_init_gen(struct net_device *dev)
{
struct ip6_tnl *t = netdev_priv(dev);
int ret;
t->dev = dev;
t->net = dev_net(dev);
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
ret = ip6_tnl_dst_init(t);
if (ret) {
free_percpu(dev->tstats);
dev->tstats = NULL;
return ret;
}
return 0;
}
......
......@@ -1322,8 +1322,7 @@ static void ip6_link_failure(struct sk_buff *skb)
if (rt) {
if (rt->rt6i_flags & RTF_CACHE) {
dst_hold(&rt->dst);
if (ip6_del_rt(rt))
dst_free(&rt->dst);
ip6_del_rt(rt);
} else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
rt->rt6i_node->fn_sernum = -1;
}
......@@ -2028,7 +2027,8 @@ static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
struct fib6_table *table;
struct net *net = dev_net(rt->dst.dev);
if (rt == net->ipv6.ip6_null_entry) {
if (rt == net->ipv6.ip6_null_entry ||
rt->dst.flags & DST_NOCACHE) {
err = -ENOENT;
goto out;
}
......@@ -2515,6 +2515,7 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
rt->rt6i_dst.addr = *addr;
rt->rt6i_dst.plen = 128;
rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
rt->dst.flags |= DST_NOCACHE;
atomic_set(&rt->dst.__refcnt, 1);
......
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