[netfilter-cvslog] r3872 - trunk/patch-o-matic-ng/nfnetlink/linux-2.6/include/linux/netfilter

[laforge at netfilter.org]

Author: laforge at netfilter.org
Date: 2005-04-16 15:16:06 +0200 (Sat, 16 Apr 2005)
New Revision: 3872

Added:
   trunk/patch-o-matic-ng/nfnetlink/linux-2.6/include/linux/netfilter/nfnetlink.h
Log:
add header file


Added: trunk/patch-o-matic-ng/nfnetlink/linux-2.6/include/linux/netfilter/nfnetlink.h
===================================================================
--- trunk/patch-o-matic-ng/nfnetlink/linux-2.6/include/linux/netfilter/nfnetlink.h	2005-04-16 13:15:49 UTC (rev 3871)
+++ trunk/patch-o-matic-ng/nfnetlink/linux-2.6/include/linux/netfilter/nfnetlink.h	2005-04-16 13:16:06 UTC (rev 3872)
@@ -0,0 +1,124 @@
+#ifndef _NFNETLINK_H
+#define _NFNETLINK_H
+#include <linux/types.h>
+
+/* 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
+{
+	unsigned short  nfa_len;
+	unsigned short  nfa_type;
+};
+
+#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))
+
+/* General form of address family dependent message.
+ */
+struct nfgenmsg {
+	unsigned char nfgen_family;
+};
+
+#define NFM_NFA(n)      ((struct nfattr *)(((char *)(n)) \
+        + NLMSG_ALIGN(sizeof(struct nfgenmsg))))
+#define NFM_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg))
+
+
+/* Now it's uses NETLINK_FIREWALL */
+#ifndef NETLINK_NETFILTER
+#define NETLINK_NETFILTER	3
+#endif
+
+/* netfilter netlink message types are split in two pieces:
+ * 8 bit subsystem, 8bit operation.
+ */
+
+#define NFNL_SUBSYS_ID(x)	((x & 0xff00) >> 8)
+#define NFNL_MSG_TYPE(x)	(x & 0x00ff)
+
+enum nfnl_subsys_id {
+	NFNL_SUBSYS_NONE = 0,
+	NFNL_SUBSYS_CTNETLINK,
+	NFNL_SUBSYS_CTNETLINK_EXP,
+	NFNL_SUBSYS_IPTNETLINK,
+	NFNL_SUBSYS_QUEUE,
+	NFNL_SUBSYS_ULOG,
+	NFNL_SUBSYS_COUNT,
+};
+
+#ifdef __KERNEL__
+
+#include <linux/capability.h>
+
+struct nfnl_callback
+{
+	kernel_cap_t cap_required; /* capabilities required for this msg */
+	int (*call)(struct sock *nl, struct sk_buff *skb, 
+		struct nlmsghdr *nlh, int *errp);
+};
+
+struct nfnetlink_subsystem
+{
+	/* Internal use. */
+	struct list_head list;
+	
+	const char *name;
+	__u8 subsys_id;		/* nfnetlink subsystem ID */
+	__u8 cb_count;		/* number of callbacks */
+	u_int32_t attr_count;	/* number of nfattr's */
+	struct nfnl_callback cb[0]; /* 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 struct semaphore nfnl_sem;
+#define nfnl_exlock()		do { } while(0)
+#define nfnl_exunlock()		do { } while(0)
+#define nfnl_exlock_nowait()	(0)
+
+#define nfnl_shlock()		down(&nfnl_sem)
+#define nfnl_shlock_nowait()	down_trylock(&nfnl_sem)
+
+#ifndef CONFIG_NF_NETLINK
+#define nfnl_shunlock()		up(&nfnl_sem)
+#else
+#define nfnl_shunlock()		do { up(&nfnl_sem); \
+                             		if(nfnl && nfnl->receive_queue.qlen) \
+                                     		nfnl->data_ready(nfnl, 0); \
+                        	} while(0)
+#endif
+
+extern void nfnl_lock(void);
+extern void nfnl_unlock(void);
+
+extern struct nfnetlink_subsystem *nfnetlink_subsys_alloc(int cb_count);
+extern int nfnetlink_subsys_register(struct nfnetlink_subsystem *n);
+extern int nfnetlink_subsys_unregister(struct nfnetlink_subsystem *n);
+
+extern int nfnetlink_check_attributes(struct nfnetlink_subsystem *subsys,
+				      struct nlmsghdr *nlh, 
+				      struct nfattr *cda[]);
+extern int nfattr_parse(struct nfattr *tb[], int maxattr, 
+			struct nfattr *nfa, int len);
+extern int nfnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, 
+			  int echo);
+
+#endif	/* __KERNEL__ */
+#endif	/* _NFNETLINK_H */