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 23710aa..7c4d92c 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 fccc218..3d982f7 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 e6dd8da6..8a159cc 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 98348d5..aca8ef4 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 86b1cb4..d5c21d4 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 34200f9..5da1926 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 e0e594f..6144685 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 3782cdd..b3962e2 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 65ea313..1cdd4b7 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);
 	}
 }