tcp: md5: add more const attributes

Now tcp_md5_hash_header() has a const tcphdr argument, we can add more
const attributes to callers.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 13 insertions, 12 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 955c9255cd98..1dad7e92f005 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -92,7 +92,7 @@ EXPORT_SYMBOL(sysctl_tcp_low_latency);
 static struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk,
                                                    __be32 addr);
 static int tcp_v4_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
-                               __be32 daddr, __be32 saddr, struct tcphdr *th);
+                               __be32 daddr, __be32 saddr, const struct tcphdr *th);
 #else
 static inline
 struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr)
@@ -1090,7 +1090,7 @@ static int tcp_v4_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
 }
 
 static int tcp_v4_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
-                               __be32 daddr, __be32 saddr, struct tcphdr *th)
+                               __be32 daddr, __be32 saddr, const struct tcphdr *th)
 {
         struct tcp_md5sig_pool *hp;
         struct hash_desc *desc;
@@ -1122,12 +1122,12 @@ clear_hash_noput:
 }
 
 int tcp_v4_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
-                        struct sock *sk, struct request_sock *req,
-                        struct sk_buff *skb)
+                        const struct sock *sk, const struct request_sock *req,
+                        const struct sk_buff *skb)
 {
         struct tcp_md5sig_pool *hp;
         struct hash_desc *desc;
-        struct tcphdr *th = tcp_hdr(skb);
+        const struct tcphdr *th = tcp_hdr(skb);
         __be32 saddr, daddr;
 
         if (sk) {
@@ -1172,7 +1172,7 @@ clear_hash_noput:
 }
 EXPORT_SYMBOL(tcp_v4_md5_hash_skb);
 
-static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb)
+static int tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
 {
         /*
          * This gets called for each TCP segment that arrives
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index da2ada881cfa..c8683fcc487a 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -761,7 +761,7 @@ static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
 
 static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
                                const struct in6_addr *daddr, struct in6_addr *saddr,
-                               struct tcphdr *th)
+                               const struct tcphdr *th)
 {
         struct tcp_md5sig_pool *hp;
         struct hash_desc *desc;
@@ -793,13 +793,14 @@ clear_hash_noput:
 }
 
 static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
-                               struct sock *sk, struct request_sock *req,
-                               struct sk_buff *skb)
+                               const struct sock *sk,
+                               const struct request_sock *req,
+                               const struct sk_buff *skb)
 {
         const struct in6_addr *saddr, *daddr;
         struct tcp_md5sig_pool *hp;
         struct hash_desc *desc;
-        struct tcphdr *th = tcp_hdr(skb);
+        const struct tcphdr *th = tcp_hdr(skb);
 
         if (sk) {
                 saddr = &inet6_sk(sk)->saddr;
@@ -842,12 +843,12 @@ clear_hash_noput:
         return 1;
 }
 
-static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
+static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
 {
         const __u8 *hash_location = NULL;
         struct tcp_md5sig_key *hash_expected;
         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
-        struct tcphdr *th = tcp_hdr(skb);
+        const struct tcphdr *th = tcp_hdr(skb);
         int genhash;
         u8 newhash[16];