Commit 63998ac2 authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by David S. Miller

ipv6: provide addr and netconf dump consistency info

This patch adds a dev_addr_genid for IPv6. The goal is to use it, combined with
dev_base_seq to check if a change occurs during a netlink dump.
If a change is detected, the flag NLM_F_DUMP_INTR is set in the first message
after the dump was interrupted.

Note that only dump of unicast addresses is checked (multicast and anycast are
not checked).
Reported-by: default avatarJunwei Zhang <junwei.zhang@6wind.com>
Reported-by: default avatarHongjun Li <hongjun.li@6wind.com>
Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0465277f
...@@ -71,6 +71,7 @@ struct netns_ipv6 { ...@@ -71,6 +71,7 @@ struct netns_ipv6 {
struct fib_rules_ops *mr6_rules_ops; struct fib_rules_ops *mr6_rules_ops;
#endif #endif
#endif #endif
atomic_t dev_addr_genid;
}; };
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
......
...@@ -621,6 +621,8 @@ static int inet6_netconf_dump_devconf(struct sk_buff *skb, ...@@ -621,6 +621,8 @@ static int inet6_netconf_dump_devconf(struct sk_buff *skb,
idx = 0; idx = 0;
head = &net->dev_index_head[h]; head = &net->dev_index_head[h];
rcu_read_lock(); rcu_read_lock();
cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
net->dev_base_seq;
hlist_for_each_entry_rcu(dev, head, index_hlist) { hlist_for_each_entry_rcu(dev, head, index_hlist) {
if (idx < s_idx) if (idx < s_idx)
goto cont; goto cont;
...@@ -638,6 +640,7 @@ static int inet6_netconf_dump_devconf(struct sk_buff *skb, ...@@ -638,6 +640,7 @@ static int inet6_netconf_dump_devconf(struct sk_buff *skb,
rcu_read_unlock(); rcu_read_unlock();
goto done; goto done;
} }
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont: cont:
idx++; idx++;
} }
...@@ -3874,6 +3877,7 @@ static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, ...@@ -3874,6 +3877,7 @@ static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
NLM_F_MULTI); NLM_F_MULTI);
if (err <= 0) if (err <= 0)
break; break;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
} }
break; break;
} }
...@@ -3931,6 +3935,7 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, ...@@ -3931,6 +3935,7 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
s_ip_idx = ip_idx = cb->args[2]; s_ip_idx = ip_idx = cb->args[2];
rcu_read_lock(); rcu_read_lock();
cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
idx = 0; idx = 0;
head = &net->dev_index_head[h]; head = &net->dev_index_head[h];
...@@ -4407,6 +4412,8 @@ static void inet6_prefix_notify(int event, struct inet6_dev *idev, ...@@ -4407,6 +4412,8 @@ static void inet6_prefix_notify(int event, struct inet6_dev *idev,
static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
{ {
struct net *net = dev_net(ifp->idev->dev);
inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
switch (event) { switch (event) {
...@@ -4432,6 +4439,7 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) ...@@ -4432,6 +4439,7 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
dst_free(&ifp->rt->dst); dst_free(&ifp->rt->dst);
break; break;
} }
atomic_inc(&net->ipv6.dev_addr_genid);
} }
static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
......
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