Re: [ANNOUNCE] libmnl 1.0.0 release

[Pablo Neira Ayuso <pablo@netfilter.org>]

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On 18/12/10 06:23, Rob Sterenborg (lists) wrote:
> On Fri, 2010-12-17 at 15:20 +0100, Pablo Neira Ayuso wrote:
>> Hi!
>>
>> The Netfilter project presents libmnl-1.0.0
> 
> Hi,
> 
> I have a CentOS 5.5 base with a 2.6.36.2 kernel installed. When
> compiling libmnl I got these errors:
> 
> nlmsg.c: In function 'mnl_nlmsg_fprintf_payload':
> nlmsg.c:274: error: 'NLA_TYPE_MASK' undeclared (first use in this
> function)
> nlmsg.c:274: error: (Each undeclared identifier is reported only once
> nlmsg.c:274: error: for each function it appears in.)
> nlmsg.c:290: error: 'NLA_F_NESTED' undeclared (first use in this
> function)
> nlmsg.c:292: error: 'NLA_F_NET_BYTEORDER' undeclared (first use in this
> function)
> make: *** [nlmsg.lo] Error 1
> 
> NLA_TYPE_MASK is used in nlmsg.c and attr.c. Searching I found that it
> should be defined in linux/netlink.h but it's not there.

I'm going to apply the following patch to fix this.

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headers: add local copy of linux/netlink.h to libmnl

From: Pablo Neira Ayuso <pablo@netfilter.org>

Davem suggested to add a copy of linux/netlink.h to avoid compilation
problems in all cases scenarios.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 include/libmnl/Makefile.am |    2 
 include/libmnl/libmnl.h    |    2 
 include/libmnl/netlink.h   |  274 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 276 insertions(+), 2 deletions(-)
 create mode 100644 include/libmnl/netlink.h

diff --git a/include/libmnl/Makefile.am b/include/libmnl/Makefile.am
index b03f68a..448d7ca 100644
--- a/include/libmnl/Makefile.am
+++ b/include/libmnl/Makefile.am
@@ -1 +1 @@
-pkginclude_HEADERS = libmnl.h
+pkginclude_HEADERS = libmnl.h netlink.h
diff --git a/include/libmnl/libmnl.h b/include/libmnl/libmnl.h
index 3e69629..a051200 100644
--- a/include/libmnl/libmnl.h
+++ b/include/libmnl/libmnl.h
@@ -11,7 +11,7 @@
 #endif
 #include <unistd.h>
 #include <sys/socket.h> /* for sa_family_t */
-#include <linux/netlink.h>
+#include <libmnl/netlink.h>
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/libmnl/netlink.h b/include/libmnl/netlink.h
new file mode 100644
index 0000000..1235669
--- /dev/null
+++ b/include/libmnl/netlink.h
@@ -0,0 +1,274 @@
+#ifndef __LINUX_NETLINK_H
+#define __LINUX_NETLINK_H
+
+#include <linux/socket.h> /* for sa_family_t */
+#include <linux/types.h>
+
+#define NETLINK_ROUTE		0	/* Routing/device hook				*/
+#define NETLINK_UNUSED		1	/* Unused number				*/
+#define NETLINK_USERSOCK	2	/* Reserved for user mode socket protocols 	*/
+#define NETLINK_FIREWALL	3	/* Firewalling hook				*/
+#define NETLINK_INET_DIAG	4	/* INET socket monitoring			*/
+#define NETLINK_NFLOG		5	/* netfilter/iptables ULOG */
+#define NETLINK_XFRM		6	/* ipsec */
+#define NETLINK_SELINUX		7	/* SELinux event notifications */
+#define NETLINK_ISCSI		8	/* Open-iSCSI */
+#define NETLINK_AUDIT		9	/* auditing */
+#define NETLINK_FIB_LOOKUP	10	
+#define NETLINK_CONNECTOR	11
+#define NETLINK_NETFILTER	12	/* netfilter subsystem */
+#define NETLINK_IP6_FW		13
+#define NETLINK_DNRTMSG		14	/* DECnet routing messages */
+#define NETLINK_KOBJECT_UEVENT	15	/* Kernel messages to userspace */
+#define NETLINK_GENERIC		16
+/* leave room for NETLINK_DM (DM Events) */
+#define NETLINK_SCSITRANSPORT	18	/* SCSI Transports */
+#define NETLINK_ECRYPTFS	19
+
+#define MAX_LINKS 32		
+
+struct sockaddr_nl {
+	sa_family_t	nl_family;	/* AF_NETLINK	*/
+	unsigned short	nl_pad;		/* zero		*/
+	__u32		nl_pid;		/* port ID	*/
+       	__u32		nl_groups;	/* multicast groups mask */
+};
+
+struct nlmsghdr {
+	__u32		nlmsg_len;	/* Length of message including header */
+	__u16		nlmsg_type;	/* Message content */
+	__u16		nlmsg_flags;	/* Additional flags */
+	__u32		nlmsg_seq;	/* Sequence number */
+	__u32		nlmsg_pid;	/* Sending process port ID */
+};
+
+/* Flags values */
+
+#define NLM_F_REQUEST		1	/* It is request message. 	*/
+#define NLM_F_MULTI		2	/* Multipart message, terminated by NLMSG_DONE */
+#define NLM_F_ACK		4	/* Reply with ack, with zero or error code */
+#define NLM_F_ECHO		8	/* Echo this request 		*/
+
+/* Modifiers to GET request */
+#define NLM_F_ROOT	0x100	/* specify tree	root	*/
+#define NLM_F_MATCH	0x200	/* return all matching	*/
+#define NLM_F_ATOMIC	0x400	/* atomic GET		*/
+#define NLM_F_DUMP	(NLM_F_ROOT|NLM_F_MATCH)
+
+/* Modifiers to NEW request */
+#define NLM_F_REPLACE	0x100	/* Override existing		*/
+#define NLM_F_EXCL	0x200	/* Do not touch, if it exists	*/
+#define NLM_F_CREATE	0x400	/* Create, if it does not exist	*/
+#define NLM_F_APPEND	0x800	/* Add to end of list		*/
+
+/*
+   4.4BSD ADD		NLM_F_CREATE|NLM_F_EXCL
+   4.4BSD CHANGE	NLM_F_REPLACE
+
+   True CHANGE		NLM_F_CREATE|NLM_F_REPLACE
+   Append		NLM_F_CREATE
+   Check		NLM_F_EXCL
+ */
+
+#define NLMSG_ALIGNTO	4
+#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
+#define NLMSG_HDRLEN	 ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
+#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
+#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
+#define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
+#define NLMSG_NEXT(nlh,len)	 ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
+				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
+#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
+			   (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
+			   (nlh)->nlmsg_len <= (len))
+#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
+
+#define NLMSG_NOOP		0x1	/* Nothing.		*/
+#define NLMSG_ERROR		0x2	/* Error		*/
+#define NLMSG_DONE		0x3	/* End of a dump	*/
+#define NLMSG_OVERRUN		0x4	/* Data lost		*/
+
+#define NLMSG_MIN_TYPE		0x10	/* < 0x10: reserved control messages */
+
+struct nlmsgerr {
+	int		error;
+	struct nlmsghdr msg;
+};
+
+#define NETLINK_ADD_MEMBERSHIP	1
+#define NETLINK_DROP_MEMBERSHIP	2
+#define NETLINK_PKTINFO		3
+#define NETLINK_BROADCAST_ERROR	4
+#define NETLINK_NO_ENOBUFS	5
+
+struct nl_pktinfo {
+	__u32	group;
+};
+
+#define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/
+
+enum {
+	NETLINK_UNCONNECTED = 0,
+	NETLINK_CONNECTED,
+};
+
+/*
+ *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
+ * +---------------------+- - -+- - - - - - - - - -+- - -+
+ * |        Header       | Pad |     Payload       | Pad |
+ * |   (struct nlattr)   | ing |                   | ing |
+ * +---------------------+- - -+- - - - - - - - - -+- - -+
+ *  <-------------- nlattr->nla_len -------------->
+ */
+
+struct nlattr {
+	__u16           nla_len;
+	__u16           nla_type;
+};
+
+/*
+ * nla_type (16 bits)
+ * +---+---+-------------------------------+
+ * | N | O | Attribute Type                |
+ * +---+---+-------------------------------+
+ * N := Carries nested attributes
+ * O := Payload stored in network byte order
+ *
+ * Note: The N and O flag are mutually exclusive.
+ */
+#define NLA_F_NESTED		(1 << 15)
+#define NLA_F_NET_BYTEORDER	(1 << 14)
+#define NLA_TYPE_MASK		~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
+
+#define NLA_ALIGNTO		4
+#define NLA_ALIGN(len)		(((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
+#define NLA_HDRLEN		((int) NLA_ALIGN(sizeof(struct nlattr)))
+
+#ifdef __KERNEL__
+
+#include <linux/capability.h>
+#include <linux/skbuff.h>
+
+struct net;
+
+static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
+{
+	return (struct nlmsghdr *)skb->data;
+}
+
+struct netlink_skb_parms {
+	struct ucred		creds;		/* Skb credentials	*/
+	__u32			pid;
+	__u32			dst_group;
+	kernel_cap_t		eff_cap;
+	__u32			loginuid;	/* Login (audit) uid */
+	__u32			sessionid;	/* Session id (audit) */
+	__u32			sid;		/* SELinux security id */
+};
+
+#define NETLINK_CB(skb)		(*(struct netlink_skb_parms*)&((skb)->cb))
+#define NETLINK_CREDS(skb)	(&NETLINK_CB((skb)).creds)
+
+
+extern void netlink_table_grab(void);
+extern void netlink_table_ungrab(void);
+
+extern struct sock *netlink_kernel_create(struct net *net,
+					  int unit,unsigned int groups,
+					  void (*input)(struct sk_buff *skb),
+					  struct mutex *cb_mutex,
+					  struct module *module);
+extern void netlink_kernel_release(struct sock *sk);
+extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
+extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
+extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group);
+extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group);
+extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
+extern int netlink_has_listeners(struct sock *sk, unsigned int group);
+extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
+extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
+			     __u32 group, gfp_t allocation);
+extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb,
+	__u32 pid, __u32 group, gfp_t allocation,
+	int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
+	void *filter_data);
+extern int netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
+extern int netlink_register_notifier(struct notifier_block *nb);
+extern int netlink_unregister_notifier(struct notifier_block *nb);
+
+/* finegrained unicast helpers: */
+struct sock *netlink_getsockbyfilp(struct file *filp);
+int netlink_attachskb(struct sock *sk, struct sk_buff *skb,
+		      long *timeo, struct sock *ssk);
+void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
+int netlink_sendskb(struct sock *sk, struct sk_buff *skb);
+
+/*
+ *	skb should fit one page. This choice is good for headerless malloc.
+ *	But we should limit to 8K so that userspace does not have to
+ *	use enormous buffer sizes on recvmsg() calls just to avoid
+ *	MSG_TRUNC when PAGE_SIZE is very large.
+ */
+#if PAGE_SIZE < 8192UL
+#define NLMSG_GOODSIZE	SKB_WITH_OVERHEAD(PAGE_SIZE)
+#else
+#define NLMSG_GOODSIZE	SKB_WITH_OVERHEAD(8192UL)
+#endif
+
+#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
+
+
+struct netlink_callback {
+	struct sk_buff		*skb;
+	const struct nlmsghdr	*nlh;
+	int			(*dump)(struct sk_buff * skb,
+					struct netlink_callback *cb);
+	int			(*done)(struct netlink_callback *cb);
+	int			family;
+	long			args[6];
+};
+
+struct netlink_notify {
+	struct net *net;
+	int pid;
+	int protocol;
+};
+
+static __inline__ struct nlmsghdr *
+__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
+{
+	struct nlmsghdr *nlh;
+	int size = NLMSG_LENGTH(len);
+
+	nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
+	nlh->nlmsg_type = type;
+	nlh->nlmsg_len = size;
+	nlh->nlmsg_flags = flags;
+	nlh->nlmsg_pid = pid;
+	nlh->nlmsg_seq = seq;
+	if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0)
+		memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
+	return nlh;
+}
+
+#define NLMSG_NEW(skb, pid, seq, type, len, flags) \
+({	if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \
+		goto nlmsg_failure; \
+	__nlmsg_put(skb, pid, seq, type, len, flags); })
+
+#define NLMSG_PUT(skb, pid, seq, type, len) \
+	NLMSG_NEW(skb, pid, seq, type, len, 0)
+
+extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
+			      const struct nlmsghdr *nlh,
+			      int (*dump)(struct sk_buff *skb, struct netlink_callback*),
+			      int (*done)(struct netlink_callback*));
+
+
+#define NL_NONROOT_RECV 0x1
+#define NL_NONROOT_SEND 0x2
+extern void netlink_set_nonroot(int protocol, unsigned flag);
+
+#endif /* __KERNEL__ */
+
+#endif	/* __LINUX_NETLINK_H */