netfilter: xtables: deconstify struct xt_action_param for matches

In future, layer-3 matches will be an xt module of their own, and
need to set the fragoff and thoff fields. Adding more pointers would
needlessy increase memory requirements (esp. so for 64-bit, where
pointers are wider).

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

include/linux/netfilter/x_tables.h

@@ -288,7 +288,7 @@ struct xt_match {
 	   non-linear skb, using skb_header_pointer and
 	   skb_ip_make_writable. */
 	bool (*match)(const struct sk_buff *skb,
-		      const struct xt_action_param *);
+		      struct xt_action_param *);
 
 	/* Called when user tries to insert an entry of this type. */
 	int (*checkentry)(const struct xt_mtchk_param *);

net/bridge/netfilter/ebt_802_3.c

@@ -13,7 +13,7 @@
 #include <linux/netfilter_bridge/ebt_802_3.h>
 
 static bool
-ebt_802_3_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+ebt_802_3_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ebt_802_3_info *info = par->matchinfo;
 	const struct ebt_802_3_hdr *hdr = ebt_802_3_hdr(skb);

net/bridge/netfilter/ebt_among.c

@@ -129,7 +129,7 @@ static int get_ip_src(const struct sk_buff *skb, __be32 *addr)
 }
 
 static bool
-ebt_among_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+ebt_among_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ebt_among_info *info = par->matchinfo;
 	const char *dmac, *smac;

net/bridge/netfilter/ebt_arp.c

@@ -16,7 +16,7 @@
 #include <linux/netfilter_bridge/ebt_arp.h>
 
 static bool
-ebt_arp_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+ebt_arp_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ebt_arp_info *info = par->matchinfo;
 	const struct arphdr *ah;

net/bridge/netfilter/ebt_ip.c

@@ -25,7 +25,7 @@ struct tcpudphdr {
 };
 
 static bool
-ebt_ip_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+ebt_ip_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ebt_ip_info *info = par->matchinfo;
 	const struct iphdr *ih;

net/bridge/netfilter/ebt_ip6.c

@@ -28,7 +28,7 @@ struct tcpudphdr {
 };
 
 static bool
-ebt_ip6_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+ebt_ip6_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ebt_ip6_info *info = par->matchinfo;
 	const struct ipv6hdr *ih6;

net/bridge/netfilter/ebt_limit.c

@@ -32,7 +32,7 @@ static DEFINE_SPINLOCK(limit_lock);
 #define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ)
 
 static bool
-ebt_limit_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+ebt_limit_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	struct ebt_limit_info *info = (void *)par->matchinfo;
 	unsigned long now = jiffies;

net/bridge/netfilter/ebt_mark_m.c

@@ -13,7 +13,7 @@
 #include <linux/netfilter_bridge/ebt_mark_m.h>
 
 static bool
-ebt_mark_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+ebt_mark_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ebt_mark_m_info *info = par->matchinfo;
 

net/bridge/netfilter/ebt_pkttype.c

@@ -13,7 +13,7 @@
 #include <linux/netfilter_bridge/ebt_pkttype.h>
 
 static bool
-ebt_pkttype_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+ebt_pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ebt_pkttype_info *info = par->matchinfo;
 

net/bridge/netfilter/ebt_stp.c

@@ -120,7 +120,7 @@ static bool ebt_filter_config(const struct ebt_stp_info *info,
 }
 
 static bool
-ebt_stp_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+ebt_stp_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ebt_stp_info *info = par->matchinfo;
 	const struct stp_header *sp;

net/bridge/netfilter/ebt_vlan.c

@@ -36,7 +36,7 @@ MODULE_LICENSE("GPL");
 #define EXIT_ON_MISMATCH(_MATCH_,_MASK_) {if (!((info->_MATCH_ == _MATCH_)^!!(info->invflags & _MASK_))) return false; }
 
 static bool
-ebt_vlan_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+ebt_vlan_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ebt_vlan_info *info = par->matchinfo;
 	const struct vlan_hdr *fp;

net/ipv4/netfilter/ip_tables.c

@@ -2138,7 +2138,7 @@ icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
 }
 
 static bool
-icmp_match(const struct sk_buff *skb, const struct xt_action_param *par)
+icmp_match(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct icmphdr *ic;
 	struct icmphdr _icmph;

net/ipv4/netfilter/ipt_addrtype.c

@@ -30,7 +30,7 @@ static inline bool match_type(struct net *net, const struct net_device *dev,
 }
 
 static bool
-addrtype_mt_v0(const struct sk_buff *skb, const struct xt_action_param *par)
+addrtype_mt_v0(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	struct net *net = dev_net(par->in ? par->in : par->out);
 	const struct ipt_addrtype_info *info = par->matchinfo;
@@ -48,7 +48,7 @@ addrtype_mt_v0(const struct sk_buff *skb, const struct xt_action_param *par)
 }
 
 static bool
-addrtype_mt_v1(const struct sk_buff *skb, const struct xt_action_param *par)
+addrtype_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	struct net *net = dev_net(par->in ? par->in : par->out);
 	const struct ipt_addrtype_info_v1 *info = par->matchinfo;

net/ipv4/netfilter/ipt_ah.c

@@ -30,7 +30,7 @@ spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, bool invert)
 	return r;
 }
 
-static bool ah_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+static bool ah_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	struct ip_auth_hdr _ahdr;
 	const struct ip_auth_hdr *ah;

net/ipv4/netfilter/ipt_ecn.c

@@ -67,8 +67,7 @@ static inline bool match_tcp(const struct sk_buff *skb,
 	return true;
 }
 
-static bool ecn_mt(const struct sk_buff *skb,
-		   const struct xt_action_param *par)
+static bool ecn_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ipt_ecn_info *info = par->matchinfo;
 

net/ipv6/netfilter/ip6_tables.c

@@ -2154,7 +2154,7 @@ icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
 }
 
 static bool
-icmp6_match(const struct sk_buff *skb, const struct xt_action_param *par)
+icmp6_match(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct icmp6hdr *ic;
 	struct icmp6hdr _icmph;

net/ipv6/netfilter/ip6t_ah.c

@@ -36,8 +36,7 @@ spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, bool invert)
 	return r;
 }
 
-static bool ah_mt6(const struct sk_buff *skb,
-		   const struct xt_action_param *par)
+static bool ah_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	struct ip_auth_hdr _ah;
 	const struct ip_auth_hdr *ah;

net/ipv6/netfilter/ip6t_eui64.c

@@ -20,7 +20,7 @@ MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
 
 static bool
-eui64_mt6(const struct sk_buff *skb, const struct xt_action_param *par)
+eui64_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	unsigned char eui64[8];
 

net/ipv6/netfilter/ip6t_frag.c

@@ -35,7 +35,7 @@ id_match(u_int32_t min, u_int32_t max, u_int32_t id, bool invert)
 }
 
 static bool
-frag_mt6(const struct sk_buff *skb, const struct xt_action_param *par)
+frag_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	struct frag_hdr _frag;
 	const struct frag_hdr *fh;

net/ipv6/netfilter/ip6t_hbh.c

@@ -44,7 +44,7 @@ MODULE_ALIAS("ip6t_dst");
 static struct xt_match hbh_mt6_reg[] __read_mostly;
 
 static bool
-hbh_mt6(const struct sk_buff *skb, const struct xt_action_param *par)
+hbh_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	struct ipv6_opt_hdr _optsh;
 	const struct ipv6_opt_hdr *oh;

net/ipv6/netfilter/ip6t_ipv6header.c

@@ -27,7 +27,7 @@ MODULE_DESCRIPTION("Xtables: IPv6 header types match");
 MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
 
 static bool
-ipv6header_mt6(const struct sk_buff *skb, const struct xt_action_param *par)
+ipv6header_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ip6t_ipv6header_info *info = par->matchinfo;
 	unsigned int temp;

net/ipv6/netfilter/ip6t_mh.c

@@ -32,8 +32,7 @@ type_match(u_int8_t min, u_int8_t max, u_int8_t type, bool invert)
 	return (type >= min && type <= max) ^ invert;
 }
 
-static bool mh_mt6(const struct sk_buff *skb,
-		   const struct xt_action_param *par)
+static bool mh_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	struct ip6_mh _mh;
 	const struct ip6_mh *mh;

net/ipv6/netfilter/ip6t_rt.c

@@ -36,8 +36,7 @@ segsleft_match(u_int32_t min, u_int32_t max, u_int32_t id, bool invert)
 	return r;
 }
 
-static bool rt_mt6(const struct sk_buff *skb,
-		   const struct xt_action_param *par)
+static bool rt_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	struct ipv6_rt_hdr _route;
 	const struct ipv6_rt_hdr *rh;

net/netfilter/xt_cluster.c

@@ -86,7 +86,7 @@ xt_cluster_is_multicast_addr(const struct sk_buff *skb, u_int8_t family)
 }
 
 static bool
-xt_cluster_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+xt_cluster_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	struct sk_buff *pskb = (struct sk_buff *)skb;
 	const struct xt_cluster_match_info *info = par->matchinfo;

net/netfilter/xt_comment.c

@@ -16,7 +16,7 @@ MODULE_ALIAS("ipt_comment");
 MODULE_ALIAS("ip6t_comment");
 
 static bool
-comment_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+comment_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	/* We always match */
 	return true;

net/netfilter/xt_connbytes.c

@@ -18,7 +18,7 @@ MODULE_ALIAS("ipt_connbytes");
 MODULE_ALIAS("ip6t_connbytes");
 
 static bool
-connbytes_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+connbytes_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_connbytes_info *sinfo = par->matchinfo;
 	const struct nf_conn *ct;

net/netfilter/xt_connlimit.c

@@ -173,7 +173,7 @@ static int count_them(struct net *net,
 }
 
 static bool
-connlimit_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+connlimit_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	struct net *net = dev_net(par->in ? par->in : par->out);
 	const struct xt_connlimit_info *info = par->matchinfo;

net/netfilter/xt_connmark.c

@@ -91,7 +91,7 @@ static void connmark_tg_destroy(const struct xt_tgdtor_param *par)
 }
 
 static bool
-connmark_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+connmark_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_connmark_mtinfo1 *info = par->matchinfo;
 	enum ip_conntrack_info ctinfo;

net/netfilter/xt_conntrack.c

@@ -113,7 +113,7 @@ ct_proto_port_check(const struct xt_conntrack_mtinfo2 *info,
 }
 
 static bool
-conntrack_mt(const struct sk_buff *skb, const struct xt_action_param *par,
+conntrack_mt(const struct sk_buff *skb, struct xt_action_param *par,
              u16 state_mask, u16 status_mask)
 {
 	const struct xt_conntrack_mtinfo2 *info = par->matchinfo;
@@ -191,15 +191,15 @@ conntrack_mt(const struct sk_buff *skb, const struct xt_action_param *par,
 }
 
 static bool
-conntrack_mt_v1(const struct sk_buff *skb, const struct xt_action_param *par)
+conntrack_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_conntrack_mtinfo1 *info = par->matchinfo;
 
 	return conntrack_mt(skb, par, info->state_mask, info->status_mask);
 }
 
 static bool
-conntrack_mt_v2(const struct sk_buff *skb, const struct xt_action_param *par)
+conntrack_mt_v2(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_conntrack_mtinfo2 *info = par->matchinfo;
 

net/netfilter/xt_dccp.c

@@ -96,7 +96,7 @@ match_option(u_int8_t option, const struct sk_buff *skb, unsigned int protoff,
 }
 
 static bool
-dccp_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+dccp_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_dccp_info *info = par->matchinfo;
 	const struct dccp_hdr *dh;

net/netfilter/xt_dscp.c

@@ -25,7 +25,7 @@ MODULE_ALIAS("ipt_tos");
 MODULE_ALIAS("ip6t_tos");
 
 static bool
-dscp_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+dscp_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_dscp_info *info = par->matchinfo;
 	u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT;
@@ -34,7 +34,7 @@ dscp_mt(const struct sk_buff *skb, const struct xt_action_param *par)
 }
 
 static bool
-dscp_mt6(const struct sk_buff *skb, const struct xt_action_param *par)
+dscp_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_dscp_info *info = par->matchinfo;
 	u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT;
@@ -54,8 +54,7 @@ static int dscp_mt_check(const struct xt_mtchk_param *par)
 	return 0;
 }
 
-static bool tos_mt(const struct sk_buff *skb,
-		   const struct xt_action_param *par)
+static bool tos_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_tos_match_info *info = par->matchinfo;
 

net/netfilter/xt_esp.c

@@ -36,8 +36,7 @@ spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, bool invert)
 	return r;
 }
 
-static bool esp_mt(const struct sk_buff *skb,
-		   const struct xt_action_param *par)
+static bool esp_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ip_esp_hdr *eh;
 	struct ip_esp_hdr _esp;

net/netfilter/xt_hashlimit.c

@@ -516,7 +516,7 @@ hashlimit_init_dst(const struct xt_hashlimit_htable *hinfo,
 }
 
 static bool
-hashlimit_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+hashlimit_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
 	struct xt_hashlimit_htable *hinfo = info->hinfo;

net/netfilter/xt_helper.c

@@ -24,7 +24,7 @@ MODULE_ALIAS("ip6t_helper");
 
 
 static bool
-helper_mt(const struct sk_buff *skb, const struct xt_action_param *par)
+helper_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_helper_info *info = par->matchinfo;
 	const struct nf_conn *ct;

net/netfilter/xt_hl.c

@@ -25,8 +25,7 @@ MODULE_LICENSE("GPL");
 MODULE_ALIAS("ipt_ttl");
 MODULE_ALIAS("ip6t_hl");
 
-static bool ttl_mt(const struct sk_buff *skb,
-		   const struct xt_action_param *par)
+static bool ttl_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ipt_ttl_info *info = par->matchinfo;
 	const u8 ttl = ip_hdr(skb)->ttl;
@@ -45,8 +44,7 @@ static bool ttl_mt(const struct sk_buff *skb,
 	return false;
 }
 
-static bool hl_mt6(const struct sk_buff *skb,
-		   const struct xt_action_param *par)
+static bool hl_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct ip6t_hl_info *info = par->matchinfo;
 	const struct ipv6hdr *ip6h = ipv6_hdr(skb);

net/netfilter/xt_iprange.c

@@ -17,7 +17,7 @@
 #include <linux/netfilter/xt_iprange.h>
 
 static bool
-iprange_mt4(const struct sk_buff *skb, const struct xt_action_param *par)
+iprange_mt4(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_iprange_mtinfo *info = par->matchinfo;
 	const struct iphdr *iph = ip_hdr(skb);
@@ -68,7 +68,7 @@ iprange_ipv6_sub(const struct in6_addr *a, const struct in6_addr *b)
 }
 
 static bool
-iprange_mt6(const struct sk_buff *skb, const struct xt_action_param *par)
+iprange_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_iprange_mtinfo *info = par->matchinfo;
 	const struct ipv6hdr *iph = ipv6_hdr(skb);