Commit 0465277f authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by David S. Miller
Browse files

ipv4: provide addr and netconf dump consistency info 



This patch takes benefit of dev_addr_genid and 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 seq and prev_seq must be reset between each family in rtnl_dump_all()
because they are specific to each family.

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 976c90b9

net/core/rtnetlink.c

+4 −1
Original line number Diff line number Diff line
@@ -1929,8 +1929,11 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 
		if (rtnl_msg_handlers[idx] == NULL ||

		    rtnl_msg_handlers[idx][type].dumpit == NULL)

			continue;

		if (idx > s_idx)

		if (idx > s_idx) {

			memset(&cb->args[0], 0, sizeof(cb->args));

			cb->prev_seq = 0;

			cb->seq = 0;

		}

		if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))

			break;

	}

net/ipv4/devinet.c

+6 −0
Original line number Diff line number Diff line
@@ -1499,6 +1499,8 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 
		idx = 0;

		head = &net->dev_index_head[h];

		rcu_read_lock();

		cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^

			  net->dev_base_seq;

		hlist_for_each_entry_rcu(dev, head, index_hlist) {

			if (idx < s_idx)

				goto cont;
@@ -1519,6 +1521,7 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 
					rcu_read_unlock();

					goto done;

				}

				nl_dump_check_consistent(cb, nlmsg_hdr(skb));

			}

cont:

			idx++;
@@ -1807,6 +1810,8 @@ static int inet_netconf_dump_devconf(struct sk_buff *skb, 
		idx = 0;

		head = &net->dev_index_head[h];

		rcu_read_lock();

		cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^

			  net->dev_base_seq;

		hlist_for_each_entry_rcu(dev, head, index_hlist) {

			if (idx < s_idx)

				goto cont;
@@ -1824,6 +1829,7 @@ static int inet_netconf_dump_devconf(struct sk_buff *skb, 
				rcu_read_unlock();

				goto done;

			}

			nl_dump_check_consistent(cb, nlmsg_hdr(skb));

cont:

			idx++;

		}

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