netfilter: fix various sparse warnings

net/bridge/br_netfilter.c:870:6: symbol 'br_netfilter_enable' was not declared. Should it be static?
  no; add include
net/ipv4/netfilter/nft_reject_ipv4.c:22:6: symbol 'nft_reject_ipv4_eval' was not declared. Should it be static?
  yes
net/ipv6/netfilter/nf_reject_ipv6.c:16:6: symbol 'nf_send_reset6' was not declared. Should it be static?
  no; add include
net/ipv6/netfilter/nft_reject_ipv6.c:22:6: symbol 'nft_reject_ipv6_eval' was not declared. Should it be static?
  yes
net/netfilter/core.c:33:32: symbol 'nf_ipv6_ops' was not declared. Should it be static?
  no; add include
net/netfilter/xt_DSCP.c:40:57: cast truncates bits from constant value (ffffff03 becomes 3)
net/netfilter/xt_DSCP.c:57:59: cast truncates bits from constant value (ffffff03 becomes 3)
  add __force, 3 is what we want.
net/ipv4/netfilter/nf_log_arp.c:77:6: symbol 'nf_log_arp_packet' was not declared. Should it be static?
  yes
net/ipv4/netfilter/nf_reject_ipv4.c:17:6: symbol 'nf_send_reset' was not declared. Should it be static?
  no; add include
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/bridge/br_netfilter.c

@@ -35,6 +35,7 @@
 #include <net/ip.h>
 #include <net/ipv6.h>
 #include <net/route.h>
+#include <net/netfilter/br_netfilter.h>
 
 #include <asm/uaccess.h>
 #include "br_private.h"

net/ipv4/netfilter/nf_log_arp.c

@@ -75,7 +75,7 @@ static void dump_arp_packet(struct nf_log_buf *m,
 		       ap->mac_src, ap->ip_src, ap->mac_dst, ap->ip_dst);
 }
 
-void nf_log_arp_packet(struct net *net, u_int8_t pf,
+static void nf_log_arp_packet(struct net *net, u_int8_t pf,
 			      unsigned int hooknum, const struct sk_buff *skb,
 			      const struct net_device *in,
 			      const struct net_device *out,

net/ipv4/netfilter/nf_reject_ipv4.c

@@ -11,6 +11,7 @@
 #include <net/tcp.h>
 #include <net/route.h>
 #include <net/dst.h>
+#include <net/netfilter/ipv4/nf_reject.h>
 #include <linux/netfilter_ipv4.h>
 
 /* Send RST reply */

net/ipv4/netfilter/nft_reject_ipv4.c

@@ -19,7 +19,7 @@
 #include <net/netfilter/ipv4/nf_reject.h>
 #include <net/netfilter/nft_reject.h>
 
-void nft_reject_ipv4_eval(const struct nft_expr *expr,
+static void nft_reject_ipv4_eval(const struct nft_expr *expr,
 				 struct nft_data data[NFT_REG_MAX + 1],
 				 const struct nft_pktinfo *pkt)
 {
@@ -36,7 +36,6 @@ void nft_reject_ipv4_eval(const struct nft_expr *expr,
 
 	data[NFT_REG_VERDICT].verdict = NF_DROP;
 }
-EXPORT_SYMBOL_GPL(nft_reject_ipv4_eval);
 
 static struct nft_expr_type nft_reject_ipv4_type;
 static const struct nft_expr_ops nft_reject_ipv4_ops = {

net/ipv6/netfilter/nf_reject_ipv6.c

@@ -11,6 +11,7 @@
 #include <net/ip6_route.h>
 #include <net/ip6_fib.h>
 #include <net/ip6_checksum.h>
+#include <net/netfilter/ipv6/nf_reject.h>
 #include <linux/netfilter_ipv6.h>
 
 void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)

net/ipv6/netfilter/nft_reject_ipv6.c

@@ -19,7 +19,7 @@
 #include <net/netfilter/nft_reject.h>
 #include <net/netfilter/ipv6/nf_reject.h>
 
-void nft_reject_ipv6_eval(const struct nft_expr *expr,
+static void nft_reject_ipv6_eval(const struct nft_expr *expr,
 				 struct nft_data data[NFT_REG_MAX + 1],
 				 const struct nft_pktinfo *pkt)
 {
@@ -38,7 +38,6 @@ void nft_reject_ipv6_eval(const struct nft_expr *expr,
 
 	data[NFT_REG_VERDICT].verdict = NF_DROP;
 }
-EXPORT_SYMBOL_GPL(nft_reject_ipv6_eval);
 
 static struct nft_expr_type nft_reject_ipv6_type;
 static const struct nft_expr_ops nft_reject_ipv6_ops = {

net/netfilter/core.c

@@ -17,6 +17,7 @@
 #include <linux/interrupt.h>
 #include <linux/if.h>
 #include <linux/netdevice.h>
+#include <linux/netfilter_ipv6.h>
 #include <linux/inetdevice.h>
 #include <linux/proc_fs.h>
 #include <linux/mutex.h>

net/netfilter/xt_DSCP.c

@@ -37,7 +37,8 @@ dscp_tg(struct sk_buff *skb, const struct xt_action_param *par)
 		if (!skb_make_writable(skb, sizeof(struct iphdr)))
 			return NF_DROP;
 
-		ipv4_change_dsfield(ip_hdr(skb), (__u8)(~XT_DSCP_MASK),
+		ipv4_change_dsfield(ip_hdr(skb),
+				    (__force __u8)(~XT_DSCP_MASK),
 				    dinfo->dscp << XT_DSCP_SHIFT);
 
 	}
@@ -54,7 +55,8 @@ dscp_tg6(struct sk_buff *skb, const struct xt_action_param *par)
 		if (!skb_make_writable(skb, sizeof(struct ipv6hdr)))
 			return NF_DROP;
 
-		ipv6_change_dsfield(ipv6_hdr(skb), (__u8)(~XT_DSCP_MASK),
+		ipv6_change_dsfield(ipv6_hdr(skb),
+				    (__force __u8)(~XT_DSCP_MASK),
 				    dinfo->dscp << XT_DSCP_SHIFT);
 	}
 	return XT_CONTINUE;