[NETFILTER]: nfnetlink: convert to generic netlink attribute functions

Get rid of the duplicated rtnetlink macros and use the generic netlink
attribute functions. The old duplicated stuff is moved to a new header
file that exists just for userspace.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netfilter/Kbuild

@@ -40,5 +40,6 @@ unifdef-y += nf_conntrack_common.h
 unifdef-y += nf_conntrack_ftp.h
 unifdef-y += nf_conntrack_tcp.h
 unifdef-y += nfnetlink.h
+unifdef-y += nfnetlink_compat.h
 unifdef-y += x_tables.h
 unifdef-y += xt_physdev.h

include/linux/netfilter/nfnetlink.h

@@ -1,16 +1,7 @@
 #ifndef _NFNETLINK_H
 #define _NFNETLINK_H
 #include <linux/types.h>
-
-#ifndef __KERNEL__
-/* nfnetlink groups: Up to 32 maximum - backwards compatibility for userspace */
-#define NF_NETLINK_CONNTRACK_NEW 		0x00000001
-#define NF_NETLINK_CONNTRACK_UPDATE		0x00000002
-#define NF_NETLINK_CONNTRACK_DESTROY		0x00000004
-#define NF_NETLINK_CONNTRACK_EXP_NEW		0x00000008
-#define NF_NETLINK_CONNTRACK_EXP_UPDATE		0x00000010
-#define NF_NETLINK_CONNTRACK_EXP_DESTROY	0x00000020
-#endif
+#include <linux/netfilter/nfnetlink_compat.h>
 
 enum nfnetlink_groups {
 	NFNLGRP_NONE,
@@ -31,48 +22,6 @@ enum nfnetlink_groups {
 };
 #define NFNLGRP_MAX	(__NFNLGRP_MAX - 1)
 
-/* Generic structure for encapsulation optional netfilter information.
- * It is reminiscent of sockaddr, but with sa_family replaced
- * with attribute type. 
- * ! This should someday be put somewhere generic as now rtnetlink and
- * ! nfnetlink use the same attributes methods. - J. Schulist.
- */
-
-struct nfattr
-{
-	u_int16_t nfa_len;
-	u_int16_t nfa_type;	/* we use 15 bits for the type, and the highest
-				 * bit to indicate whether the payload is nested */
-};
-
-/* FIXME: Apart from NFNL_NFA_NESTED shamelessly copy and pasted from
- * rtnetlink.h, it's time to put this in a generic file */
-
-#define NFNL_NFA_NEST	0x8000
-#define NFA_TYPE(attr) 	((attr)->nfa_type & 0x7fff)
-
-#define NFA_ALIGNTO     4
-#define NFA_ALIGN(len)	(((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1))
-#define NFA_OK(nfa,len)	((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \
-	&& (nfa)->nfa_len <= (len))
-#define NFA_NEXT(nfa,attrlen)	((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \
-	(struct nfattr *)(((char *)(nfa)) + NFA_ALIGN((nfa)->nfa_len)))
-#define NFA_LENGTH(len)	(NFA_ALIGN(sizeof(struct nfattr)) + (len))
-#define NFA_SPACE(len)	NFA_ALIGN(NFA_LENGTH(len))
-#define NFA_DATA(nfa)   ((void *)(((char *)(nfa)) + NFA_LENGTH(0)))
-#define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0))
-#define NFA_NEST(skb, type) \
-({	struct nfattr *__start = (struct nfattr *)skb_tail_pointer(skb); \
-	NFA_PUT(skb, (NFNL_NFA_NEST | type), 0, NULL); \
-	__start;  })
-#define NFA_NEST_END(skb, start) \
-({      (start)->nfa_len = skb_tail_pointer(skb) - (unsigned char *)(start); \
-        (skb)->len; })
-#define NFA_NEST_CANCEL(skb, start) \
-({      if (start) \
-                skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
-        -1; })
-
 /* General form of address family dependent message.
  */
 struct nfgenmsg {
@@ -83,10 +32,6 @@ struct nfgenmsg {
 
 #define NFNETLINK_V0	0
 
-#define NFM_NFA(n)      ((struct nfattr *)(((char *)(n)) \
-        + NLMSG_ALIGN(sizeof(struct nfgenmsg))))
-#define NFM_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg))
-
 /* netfilter netlink message types are split in two pieces:
  * 8 bit subsystem, 8bit operation.
  */
@@ -107,12 +52,13 @@ struct nfgenmsg {
 
 #include <linux/netlink.h>
 #include <linux/capability.h>
+#include <net/netlink.h>
 
 struct nfnl_callback
 {
 	int (*call)(struct sock *nl, struct sk_buff *skb, 
-		struct nlmsghdr *nlh, struct nfattr *cda[]);
-	u_int16_t attr_count;	/* number of nfattr's */
+		struct nlmsghdr *nlh, struct nlattr *cda[]);
+	u_int16_t attr_count;	/* number of nlattr's */
 };
 
 struct nfnetlink_subsystem
@@ -123,27 +69,15 @@ struct nfnetlink_subsystem
 	const struct nfnl_callback *cb;	/* callback for individual types */
 };
 
-extern void __nfa_fill(struct sk_buff *skb, int attrtype,
-        int attrlen, const void *data);
-#define NFA_PUT(skb, attrtype, attrlen, data) \
-({ if (skb_tailroom(skb) < (int)NFA_SPACE(attrlen)) goto nfattr_failure; \
-   __nfa_fill(skb, attrtype, attrlen, data); })
-
 extern int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);
 extern int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n);
 
-extern void nfattr_parse(struct nfattr *tb[], int maxattr, 
-			struct nfattr *nfa, int len);
-
-#define nfattr_parse_nested(tb, max, nfa) \
-	nfattr_parse((tb), (max), NFA_DATA((nfa)), NFA_PAYLOAD((nfa)))
-
 #define nfattr_bad_size(tb, max, cta_min)				\
 ({	int __i, __res = 0;						\
- 	for (__i=0; __i<max; __i++) {					\
+	for (__i=1; __i <= max; __i++) {					\
  		if (!cta_min[__i])					\
  			continue;					\
- 		if (tb[__i] && NFA_PAYLOAD(tb[__i]) < cta_min[__i]){	\
+		if (tb[__i] && nla_len(tb[__i]) < cta_min[__i]){	\
  			__res = 1;					\
  			break;						\
  		}							\

include/linux/netfilter/nfnetlink_compat.h

@@ -0,0 +1,61 @@
+#ifndef _NFNETLINK_COMPAT_H
+#define _NFNETLINK_COMPAT_H
+#ifndef __KERNEL
+/* Old nfnetlink macros for userspace */
+
+/* nfnetlink groups: Up to 32 maximum */
+#define NF_NETLINK_CONNTRACK_NEW 		0x00000001
+#define NF_NETLINK_CONNTRACK_UPDATE		0x00000002
+#define NF_NETLINK_CONNTRACK_DESTROY		0x00000004
+#define NF_NETLINK_CONNTRACK_EXP_NEW		0x00000008
+#define NF_NETLINK_CONNTRACK_EXP_UPDATE		0x00000010
+#define NF_NETLINK_CONNTRACK_EXP_DESTROY	0x00000020
+
+/* Generic structure for encapsulation optional netfilter information.
+ * It is reminiscent of sockaddr, but with sa_family replaced
+ * with attribute type.
+ * ! This should someday be put somewhere generic as now rtnetlink and
+ * ! nfnetlink use the same attributes methods. - J. Schulist.
+ */
+
+struct nfattr
+{
+	u_int16_t nfa_len;
+	u_int16_t nfa_type;	/* we use 15 bits for the type, and the highest
+				 * bit to indicate whether the payload is nested */
+};
+
+/* FIXME: Apart from NFNL_NFA_NESTED shamelessly copy and pasted from
+ * rtnetlink.h, it's time to put this in a generic file */
+
+#define NFNL_NFA_NEST	0x8000
+#define NFA_TYPE(attr) 	((attr)->nfa_type & 0x7fff)
+
+#define NFA_ALIGNTO     4
+#define NFA_ALIGN(len)	(((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1))
+#define NFA_OK(nfa,len)	((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \
+	&& (nfa)->nfa_len <= (len))
+#define NFA_NEXT(nfa,attrlen)	((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \
+	(struct nfattr *)(((char *)(nfa)) + NFA_ALIGN((nfa)->nfa_len)))
+#define NFA_LENGTH(len)	(NFA_ALIGN(sizeof(struct nfattr)) + (len))
+#define NFA_SPACE(len)	NFA_ALIGN(NFA_LENGTH(len))
+#define NFA_DATA(nfa)   ((void *)(((char *)(nfa)) + NFA_LENGTH(0)))
+#define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0))
+#define NFA_NEST(skb, type) \
+({	struct nfattr *__start = (struct nfattr *)skb_tail_pointer(skb); \
+	NFA_PUT(skb, (NFNL_NFA_NEST | type), 0, NULL); \
+	__start;  })
+#define NFA_NEST_END(skb, start) \
+({      (start)->nfa_len = skb_tail_pointer(skb) - (unsigned char *)(start); \
+        (skb)->len; })
+#define NFA_NEST_CANCEL(skb, start) \
+({      if (start) \
+                skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
+        -1; })
+
+#define NFM_NFA(n)      ((struct nfattr *)(((char *)(n)) \
+        + NLMSG_ALIGN(sizeof(struct nfgenmsg))))
+#define NFM_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg))
+
+#endif /* ! __KERNEL__ */
+#endif /* _NFNETLINK_COMPAT_H */

include/net/netfilter/nf_conntrack_l3proto.h

@@ -11,11 +11,10 @@
 
 #ifndef _NF_CONNTRACK_L3PROTO_H
 #define _NF_CONNTRACK_L3PROTO_H
+#include <linux/netlink.h>
 #include <linux/seq_file.h>
 #include <net/netfilter/nf_conntrack.h>
 
-struct nfattr;
-
 struct nf_conntrack_l3proto
 {
 	/* L3 Protocol Family number. ex) PF_INET */
@@ -67,7 +66,7 @@ struct nf_conntrack_l3proto
 	int (*tuple_to_nfattr)(struct sk_buff *skb,
 			       const struct nf_conntrack_tuple *t);
 
-	int (*nfattr_to_tuple)(struct nfattr *tb[],
+	int (*nfattr_to_tuple)(struct nlattr *tb[],
 			       struct nf_conntrack_tuple *t);
 
 #ifdef CONFIG_SYSCTL

include/net/netfilter/nf_conntrack_l4proto.h

@@ -9,10 +9,10 @@
 
 #ifndef _NF_CONNTRACK_L4PROTO_H
 #define _NF_CONNTRACK_L4PROTO_H
+#include <linux/netlink.h>
 #include <net/netfilter/nf_conntrack.h>
 
 struct seq_file;
-struct nfattr;
 
 struct nf_conntrack_l4proto
 {
@@ -65,15 +65,15 @@ struct nf_conntrack_l4proto
 		     int pf, unsigned int hooknum);
 
 	/* convert protoinfo to nfnetink attributes */
-	int (*to_nfattr)(struct sk_buff *skb, struct nfattr *nfa,
+	int (*to_nfattr)(struct sk_buff *skb, struct nlattr *nla,
 			 const struct nf_conn *ct);
 
 	/* convert nfnetlink attributes to protoinfo */
-	int (*from_nfattr)(struct nfattr *tb[], struct nf_conn *ct);
+	int (*from_nfattr)(struct nlattr *tb[], struct nf_conn *ct);
 
 	int (*tuple_to_nfattr)(struct sk_buff *skb,
 			       const struct nf_conntrack_tuple *t);
-	int (*nfattr_to_tuple)(struct nfattr *tb[],
+	int (*nfattr_to_tuple)(struct nlattr *tb[],
 			       struct nf_conntrack_tuple *t);
 
 #ifdef CONFIG_SYSCTL
@@ -113,7 +113,7 @@ extern void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto);
 /* Generic netlink helpers */
 extern int nf_ct_port_tuple_to_nfattr(struct sk_buff *skb,
 				      const struct nf_conntrack_tuple *tuple);
-extern int nf_ct_port_nfattr_to_tuple(struct nfattr *tb[],
+extern int nf_ct_port_nfattr_to_tuple(struct nlattr *tb[],
 				      struct nf_conntrack_tuple *t);
 
 /* Log invalid packets */

include/net/netfilter/nf_nat_protocol.h

@@ -41,7 +41,7 @@ struct nf_nat_protocol
 	int (*range_to_nfattr)(struct sk_buff *skb,
 			       const struct nf_nat_range *range);
 
-	int (*nfattr_to_range)(struct nfattr *tb[],
+	int (*nfattr_to_range)(struct nlattr *tb[],
 			       struct nf_nat_range *range);
 };
 
@@ -64,7 +64,7 @@ extern struct nf_nat_protocol *find_nat_proto(u_int16_t protonum);
 
 extern int nf_nat_port_range_to_nfattr(struct sk_buff *skb,
 				       const struct nf_nat_range *range);
-extern int nf_nat_port_nfattr_to_range(struct nfattr *tb[],
+extern int nf_nat_port_nfattr_to_range(struct nlattr *tb[],
 				       struct nf_nat_range *range);
 
 #endif /*_NF_NAT_PROTO_H*/

net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c

@@ -363,32 +363,32 @@ getorigdst(struct sock *sk, int optval, void __user *user, int *len)
 static int ipv4_tuple_to_nfattr(struct sk_buff *skb,
 				const struct nf_conntrack_tuple *tuple)
 {
-	NFA_PUT(skb, CTA_IP_V4_SRC, sizeof(u_int32_t),
+	NLA_PUT(skb, CTA_IP_V4_SRC, sizeof(u_int32_t),
 		&tuple->src.u3.ip);
-	NFA_PUT(skb, CTA_IP_V4_DST, sizeof(u_int32_t),
+	NLA_PUT(skb, CTA_IP_V4_DST, sizeof(u_int32_t),
 		&tuple->dst.u3.ip);
 	return 0;
 
-nfattr_failure:
+nla_put_failure:
 	return -1;
 }
 
-static const size_t cta_min_ip[CTA_IP_MAX] = {
-	[CTA_IP_V4_SRC-1]       = sizeof(u_int32_t),
-	[CTA_IP_V4_DST-1]       = sizeof(u_int32_t),
+static const size_t cta_min_ip[CTA_IP_MAX+1] = {
+	[CTA_IP_V4_SRC]	= sizeof(u_int32_t),
+	[CTA_IP_V4_DST]	= sizeof(u_int32_t),
 };
 
-static int ipv4_nfattr_to_tuple(struct nfattr *tb[],
+static int ipv4_nfattr_to_tuple(struct nlattr *tb[],
 				struct nf_conntrack_tuple *t)
 {
-	if (!tb[CTA_IP_V4_SRC-1] || !tb[CTA_IP_V4_DST-1])
+	if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST])
 		return -EINVAL;
 
 	if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
 		return -EINVAL;
 
-	t->src.u3.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
-	t->dst.u3.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
+	t->src.u3.ip = *(__be32 *)nla_data(tb[CTA_IP_V4_SRC]);
+	t->dst.u3.ip = *(__be32 *)nla_data(tb[CTA_IP_V4_DST]);
 
 	return 0;
 }

net/ipv4/netfilter/nf_conntrack_proto_icmp.c

@@ -235,42 +235,42 @@ icmp_error(struct sk_buff *skb, unsigned int dataoff,
 static int icmp_tuple_to_nfattr(struct sk_buff *skb,
 				const struct nf_conntrack_tuple *t)
 {
-	NFA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(u_int16_t),
+	NLA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(u_int16_t),
 		&t->src.u.icmp.id);
-	NFA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
+	NLA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
 		&t->dst.u.icmp.type);
-	NFA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
+	NLA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
 		&t->dst.u.icmp.code);
 
 	return 0;
 
-nfattr_failure:
+nla_put_failure:
 	return -1;
 }
 
-static const size_t cta_min_proto[CTA_PROTO_MAX] = {
-	[CTA_PROTO_ICMP_TYPE-1] = sizeof(u_int8_t),
-	[CTA_PROTO_ICMP_CODE-1] = sizeof(u_int8_t),
-	[CTA_PROTO_ICMP_ID-1]   = sizeof(u_int16_t)
+static const size_t cta_min_proto[CTA_PROTO_MAX+1] = {
+	[CTA_PROTO_ICMP_TYPE]	= sizeof(u_int8_t),
+	[CTA_PROTO_ICMP_CODE]	= sizeof(u_int8_t),
+	[CTA_PROTO_ICMP_ID]	= sizeof(u_int16_t)
 };
 
-static int icmp_nfattr_to_tuple(struct nfattr *tb[],
+static int icmp_nfattr_to_tuple(struct nlattr *tb[],
 				struct nf_conntrack_tuple *tuple)
 {
-	if (!tb[CTA_PROTO_ICMP_TYPE-1]
-	    || !tb[CTA_PROTO_ICMP_CODE-1]
-	    || !tb[CTA_PROTO_ICMP_ID-1])
+	if (!tb[CTA_PROTO_ICMP_TYPE]
+	    || !tb[CTA_PROTO_ICMP_CODE]
+	    || !tb[CTA_PROTO_ICMP_ID])
 		return -EINVAL;
 
 	if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
 		return -EINVAL;
 
 	tuple->dst.u.icmp.type =
-			*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_TYPE-1]);
+			*(u_int8_t *)nla_data(tb[CTA_PROTO_ICMP_TYPE]);
 	tuple->dst.u.icmp.code =
-			*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_CODE-1]);
+			*(u_int8_t *)nla_data(tb[CTA_PROTO_ICMP_CODE]);
 	tuple->src.u.icmp.id =
-			*(__be16 *)NFA_DATA(tb[CTA_PROTO_ICMP_ID-1]);
+			*(__be16 *)nla_data(tb[CTA_PROTO_ICMP_ID]);
 
 	if (tuple->dst.u.icmp.type >= sizeof(invmap)
 	    || !invmap[tuple->dst.u.icmp.type])