mptcp: change info of get_addr as const

get_addr() interfaces will be invoked by dump_addr(), which using const
parameters "info", so this patch changes "info" parameters of get_addr()
as const too.

Some adaptations are also needed. No longer use genl_info_pm_nl() because
it doesn't accept a 'const' variable, but that's OK to get pernet via
genl_info_net().

Signed-off-by: Geliang Tang <[email protected]>

Author: Geliang Tang

net/mptcp/pm.c

@@ -435,7 +435,7 @@ bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc)
 }
 
 static int mptcp_pm_get_addr(u8 id, struct mptcp_pm_addr_entry *addr,
-			     struct genl_info *info)
+			     const struct genl_info *info)
 {
 	if (info->attrs[MPTCP_PM_ATTR_TOKEN])
 		return mptcp_userspace_pm_get_addr(id, addr, info);

net/mptcp/pm_netlink.c

@@ -1763,12 +1763,15 @@ int mptcp_nl_fill_addr(struct sk_buff *skb,
 }
 
 int mptcp_pm_nl_get_addr(u8 id, struct mptcp_pm_addr_entry *addr,
-			 struct genl_info *info)
+			 const struct genl_info *info)
 {
-	struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
+	struct net *net = genl_info_net(info);
 	struct mptcp_pm_addr_entry *entry;
+	struct pm_nl_pernet *pernet;
 	int ret = -EINVAL;
 
+	pernet = pm_nl_get_pernet(net);
+
 	rcu_read_lock();
 	entry = __lookup_addr_by_id(pernet, id);
 	if (entry) {

net/mptcp/pm_userspace.c

@@ -664,7 +664,7 @@ int mptcp_userspace_pm_dump_addr(struct sk_buff *msg,
 }
 
 int mptcp_userspace_pm_get_addr(u8 id, struct mptcp_pm_addr_entry *addr,
-				struct genl_info *info)
+				const struct genl_info *info)
 {
 	struct mptcp_pm_addr_entry *entry;
 	struct mptcp_sock *msk;

net/mptcp/protocol.h

@@ -1132,9 +1132,9 @@ int mptcp_pm_nl_dump_addr(struct sk_buff *msg,
 int mptcp_userspace_pm_dump_addr(struct sk_buff *msg,
 				 struct netlink_callback *cb);
 int mptcp_pm_nl_get_addr(u8 id, struct mptcp_pm_addr_entry *addr,
-			 struct genl_info *info);
+			 const struct genl_info *info);
 int mptcp_userspace_pm_get_addr(u8 id, struct mptcp_pm_addr_entry *addr,
-				struct genl_info *info);
+				const struct genl_info *info);
 
 static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow)
 {