netlink: constify nlmsghdr arguments

Consitfy nlmsghdr arguments to a couple of functions as preparation
for the next patch, which will constify the netlink message data in
all nfnetlink users.

Signed-off-by: Patrick McHardy <kaber@trash.net>

5 files changed, 13 insertions, 12 deletions

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 5ba398e90304..0fbecbbe8e9e 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -217,12 +217,13 @@ int netlink_sendskb(struct sock *sk, struct sk_buff *skb);
 
 struct netlink_callback
 {
-        struct sk_buff  *skb;
-        struct nlmsghdr *nlh;
-        int             (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
-        int             (*done)(struct netlink_callback *cb);
-        int             family;
-        long            args[6];
+        struct sk_buff          *skb;
+        const struct nlmsghdr   *nlh;
+        int                     (*dump)(struct sk_buff * skb,
+                                        struct netlink_callback *cb);
+        int                     (*done)(struct netlink_callback *cb);
+        int                     family;
+        long                    args[6];
 };
 
 struct netlink_notify
@@ -258,7 +259,7 @@ __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
         NLMSG_NEW(skb, pid, seq, type, len, 0)
 
 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
-                              struct nlmsghdr *nlh,
+                              const struct nlmsghdr *nlh,
                               int (*dump)(struct sk_buff *skb, struct netlink_callback*),
                               int (*done)(struct netlink_callback*));
 
diff --git a/include/net/netlink.h b/include/net/netlink.h
index 007bdb07dabb..a63b2192ac1c 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -365,7 +365,7 @@ static inline struct nlmsghdr *nlmsg_next(struct nlmsghdr *nlh, int *remaining)
  *
  * See nla_parse()
  */
-static inline int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen,
+static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen,
                               struct nlattr *tb[], int maxtype,
                               const struct nla_policy *policy)
 {
@@ -414,7 +414,7 @@ static inline int nlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype,
  *
  * Returns 1 if a report back to the application is requested.
  */
-static inline int nlmsg_report(struct nlmsghdr *nlh)
+static inline int nlmsg_report(const struct nlmsghdr *nlh)
 {
         return !!(nlh->nlmsg_flags & NLM_F_ECHO);
 }
diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
index 3c1895e54b7f..85ba560332ed 100644
--- a/include/net/rtnetlink.h
+++ b/include/net/rtnetlink.h
@@ -14,7 +14,7 @@ extern void	rtnl_register(int protocol, int msgtype,
 extern int      rtnl_unregister(int protocol, int msgtype);
 extern void     rtnl_unregister_all(int protocol);
 
-static inline int rtnl_msg_family(struct nlmsghdr *nlh)
+static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
 {
         if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
                 return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family;
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index da3163d15ef0..d0ff382c40ca 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1705,7 +1705,7 @@ errout:
 }
 
 int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
-                       struct nlmsghdr *nlh,
+                       const struct nlmsghdr *nlh,
                        int (*dump)(struct sk_buff *skb,
                                    struct netlink_callback *),
                        int (*done)(struct netlink_callback *))
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 9d03cc33b6cc..2dfb3e7a040d 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -1011,7 +1011,7 @@ replay:
 }
 
 static struct nlattr *
-find_dump_kind(struct nlmsghdr *n)
+find_dump_kind(const struct nlmsghdr *n)
 {
         struct nlattr *tb1, *tb2[TCA_ACT_MAX+1];
         struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];