inet: constify ip headers and in6_addr

Add const qualifiers to structs iphdr, ipv6hdr and in6_addr pointers
where possible, to make code intention more obvious.

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

9 files changed, 36 insertions, 34 deletions

diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 23710aa6a181..7c4d92c0dd1d 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -61,16 +61,16 @@ extern int			addrconf_set_dstaddr(struct net *net,
                                                      void __user *arg);
 
 extern int                      ipv6_chk_addr(struct net *net,
-                                              struct in6_addr *addr,
+                                              const struct in6_addr *addr,
                                               struct net_device *dev,
                                               int strict);
 
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 extern int                      ipv6_chk_home_addr(struct net *net,
-                                                   struct in6_addr *addr);
+                                                   const struct in6_addr *addr);
 #endif
 
-extern int                      ipv6_chk_prefix(struct in6_addr *addr,
+extern int                      ipv6_chk_prefix(const struct in6_addr *addr,
                                                 struct net_device *dev);
 
 extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
@@ -89,9 +89,9 @@ extern int			ipv6_get_lladdr(struct net_device *dev,
 extern int                      ipv6_rcv_saddr_equal(const struct sock *sk,
                                                     const struct sock *sk2);
 extern void                     addrconf_join_solict(struct net_device *dev,
-                                        struct in6_addr *addr);
+                                        const struct in6_addr *addr);
 extern void                     addrconf_leave_solict(struct inet6_dev *idev,
-                                        struct in6_addr *addr);
+                                        const struct in6_addr *addr);
 
 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
                                                     unsigned unit)
@@ -158,15 +158,15 @@ extern void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len);
 /*
  *      anycast prototypes (anycast.c)
  */
-extern int ipv6_sock_ac_join(struct sock *sk,int ifindex,struct in6_addr *addr);
-extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex,struct in6_addr *addr);
+extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr);
+extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr);
 extern void ipv6_sock_ac_close(struct sock *sk);
-extern int inet6_ac_check(struct sock *sk, struct in6_addr *addr, int ifindex);
+extern int inet6_ac_check(struct sock *sk, const struct in6_addr *addr, int ifindex);
 
-extern int ipv6_dev_ac_inc(struct net_device *dev, struct in6_addr *addr);
-extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, struct in6_addr *addr);
+extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
+extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 extern int ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
-                               struct in6_addr *addr);
+                               const struct in6_addr *addr);
 
 
 /* Device notifier */
diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
index fccc2180c61b..3d982f72d48e 100644
--- a/include/net/if_inet6.h
+++ b/include/net/if_inet6.h
@@ -196,7 +196,7 @@ struct inet6_dev {
         struct rcu_head         rcu;
 };
 
-static inline void ipv6_eth_mc_map(struct in6_addr *addr, char *buf)
+static inline void ipv6_eth_mc_map(const struct in6_addr *addr, char *buf)
 {
         /*
          *      +-------+-------+-------+-------+-------+-------+
@@ -210,7 +210,7 @@ static inline void ipv6_eth_mc_map(struct in6_addr *addr, char *buf)
         memcpy(buf + 2, &addr->s6_addr32[3], sizeof(__u32));
 }
 
-static inline void ipv6_tr_mc_map(struct in6_addr *addr, char *buf)
+static inline void ipv6_tr_mc_map(const struct in6_addr *addr, char *buf)
 {
         /* All nodes FF01::1, FF02::1, FF02::1:FFxx:xxxx */
 
diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
index e6dd8da6b2ad..8a159cc3d68b 100644
--- a/include/net/inetpeer.h
+++ b/include/net/inetpeer.h
@@ -80,7 +80,7 @@ static inline struct inet_peer *inet_getpeer_v4(__be32 v4daddr, int create)
         return inet_getpeer(&daddr, create);
 }
 
-static inline struct inet_peer *inet_getpeer_v6(struct in6_addr *v6daddr, int create)
+static inline struct inet_peer *inet_getpeer_v6(const struct in6_addr *v6daddr, int create)
 {
         struct inetpeer_addr daddr;
 
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 98348d53b2b6..aca8ef4dd67c 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -198,12 +198,12 @@ extern struct dst_entry         *fib6_rule_lookup(struct net *net,
                                                   pol_lookup_t lookup);
 
 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
-                                             struct in6_addr *daddr,
-                                             struct in6_addr *saddr);
+                                             const struct in6_addr *daddr,
+                                             const struct in6_addr *saddr);
 
 struct fib6_node                *fib6_locate(struct fib6_node *root,
-                                             struct in6_addr *daddr, int dst_len,
-                                             struct in6_addr *saddr, int src_len);
+                                             const struct in6_addr *daddr, int dst_len,
+                                             const struct in6_addr *saddr, int src_len);
 
 extern void                     fib6_clean_all(struct net *net,
                                                int (*func)(struct rt6_info *, void *arg),
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 86b1cb486903..d5c21d4d9e7e 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -86,7 +86,7 @@ extern int			ip6_del_rt(struct rt6_info *);
 
 extern int                      ip6_route_get_saddr(struct net *net,
                                                     struct rt6_info *rt,
-                                                    struct in6_addr *daddr,
+                                                    const struct in6_addr *daddr,
                                                     unsigned int prefs,
                                                     struct in6_addr *saddr);
 
@@ -112,9 +112,9 @@ extern int			ip6_dst_hoplimit(struct dst_entry *dst);
  *      support functions for ND
  *
  */
-extern struct rt6_info *        rt6_get_dflt_router(struct in6_addr *addr,
+extern struct rt6_info *        rt6_get_dflt_router(const struct in6_addr *addr,
                                                     struct net_device *dev);
-extern struct rt6_info *        rt6_add_dflt_router(struct in6_addr *gwaddr,
+extern struct rt6_info *        rt6_add_dflt_router(const struct in6_addr *gwaddr,
                                                     struct net_device *dev,
                                                     unsigned int pref);
 
@@ -122,17 +122,17 @@ extern void			rt6_purge_dflt_routers(struct net *net);
 
 extern int                      rt6_route_rcv(struct net_device *dev,
                                               u8 *opt, int len,
-                                              struct in6_addr *gwaddr);
+                                              const struct in6_addr *gwaddr);
 
-extern void                     rt6_redirect(struct in6_addr *dest,
-                                             struct in6_addr *src,
-                                             struct in6_addr *saddr,
+extern void                     rt6_redirect(const struct in6_addr *dest,
+                                             const struct in6_addr *src,
+                                             const struct in6_addr *saddr,
                                              struct neighbour *neigh,
                                              u8 *lladdr,
                                              int on_link);
 
-extern void                     rt6_pmtu_discovery(struct in6_addr *daddr,
-                                                   struct in6_addr *saddr,
+extern void                     rt6_pmtu_discovery(const struct in6_addr *daddr,
+                                                   const struct in6_addr *saddr,
                                                    struct net_device *dev,
                                                    u32 pmtu);
 
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 34200f9e6805..5da192653153 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -376,8 +376,8 @@ enum ip6_defrag_users {
 struct ip6_create_arg {
         __be32 id;
         u32 user;
-        struct in6_addr *src;
-        struct in6_addr *dst;
+        const struct in6_addr *src;
+        const struct in6_addr *dst;
 };
 
 void ip6_frag_init(struct inet_frag_queue *q, void *a);
diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index e0e594f8e9d9..6144685d601b 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -102,7 +102,8 @@ extern void			ndisc_send_redirect(struct sk_buff *skb,
                                                     struct neighbour *neigh,
                                                     const struct in6_addr *target);
 
-extern int                      ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir);
+extern int                      ndisc_mc_map(const struct in6_addr *addr, char *buf,
+                                             struct net_device *dev, int dir);
 
 extern struct sk_buff           *ndisc_build_skb(struct net_device *dev,
                                                  const struct in6_addr *daddr,
diff --git a/include/net/route.h b/include/net/route.h
index 3782cddd1383..b3962e249e14 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -191,7 +191,8 @@ static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 s
         return ip_route_input_common(skb, dst, src, tos, devin, true);
 }
 
-extern unsigned short   ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev);
+extern unsigned short   ip_rt_frag_needed(struct net *net, const struct iphdr *iph,
+                                          unsigned short new_mtu, struct net_device *dev);
 extern void             ip_rt_send_redirect(struct sk_buff *skb);
 
 extern unsigned         inet_addr_type(struct net *net, __be32 addr);
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 65ea31348631..1cdd4b7b2861 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1475,7 +1475,7 @@ extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
-extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr);
+extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
 extern int xfrm6_output(struct sk_buff *skb);
@@ -1569,8 +1569,8 @@ static inline int xfrm_addr_cmp(const xfrm_address_t *a,
         case AF_INET:
                 return (__force u32)a->a4 - (__force u32)b->a4;
         case AF_INET6:
-                return ipv6_addr_cmp((struct in6_addr *)a,
-                                     (struct in6_addr *)b);
+                return ipv6_addr_cmp((const struct in6_addr *)a,
+                                     (const struct in6_addr *)b);
         }
 }