[linux-2.6-block.git] / security / lsm_audit.c

/*
 * common LSM auditing functions
 *
 * Based on code written for SELinux by :
 *			Stephen Smalley, <sds@epoch.ncsc.mil>
 * 			James Morris <jmorris@redhat.com>
 * Author : Etienne Basset, <etienne.basset@ensta.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2,
 * as published by the Free Software Foundation.
 */

#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <net/sock.h>
#include <linux/un.h>
#include <net/af_unix.h>
#include <linux/audit.h>
#include <linux/ipv6.h>
#include <linux/ip.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/dccp.h>
#include <linux/sctp.h>
#include <linux/lsm_audit.h>

/**
 * ipv4_skb_to_auditdata : fill auditdata from skb
 * @skb : the skb
 * @ad : the audit data to fill
 * @proto : the layer 4 protocol
 *
 * return  0 on success
 */
int ipv4_skb_to_auditdata(struct sk_buff *skb,
		struct common_audit_data *ad, u8 *proto)
{
	int ret = 0;
	struct iphdr *ih;

	ih = ip_hdr(skb);
	if (ih == NULL)
		return -EINVAL;

	ad->u.net->v4info.saddr = ih->saddr;
	ad->u.net->v4info.daddr = ih->daddr;

	if (proto)
		*proto = ih->protocol;
	/* non initial fragment */
	if (ntohs(ih->frag_off) & IP_OFFSET)
		return 0;

	switch (ih->protocol) {
	case IPPROTO_TCP: {
		struct tcphdr *th = tcp_hdr(skb);
		if (th == NULL)
			break;

		ad->u.net->sport = th->source;
		ad->u.net->dport = th->dest;
		break;
	}
	case IPPROTO_UDP: {
		struct udphdr *uh = udp_hdr(skb);
		if (uh == NULL)
			break;

		ad->u.net->sport = uh->source;
		ad->u.net->dport = uh->dest;
		break;
	}
	case IPPROTO_DCCP: {
		struct dccp_hdr *dh = dccp_hdr(skb);
		if (dh == NULL)
			break;

		ad->u.net->sport = dh->dccph_sport;
		ad->u.net->dport = dh->dccph_dport;
		break;
	}
	case IPPROTO_SCTP: {
		struct sctphdr *sh = sctp_hdr(skb);
		if (sh == NULL)
			break;
		ad->u.net->sport = sh->source;
		ad->u.net->dport = sh->dest;
		break;
	}
	default:
		ret = -EINVAL;
	}
	return ret;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
/**
 * ipv6_skb_to_auditdata : fill auditdata from skb
 * @skb : the skb
 * @ad : the audit data to fill
 * @proto : the layer 4 protocol
 *
 * return  0 on success
 */
int ipv6_skb_to_auditdata(struct sk_buff *skb,
		struct common_audit_data *ad, u8 *proto)
{
	int offset, ret = 0;
	struct ipv6hdr *ip6;
	u8 nexthdr;
	__be16 frag_off;

	ip6 = ipv6_hdr(skb);
	if (ip6 == NULL)
		return -EINVAL;
	ad->u.net->v6info.saddr = ip6->saddr;
	ad->u.net->v6info.daddr = ip6->daddr;
	ret = 0;
	/* IPv6 can have several extension header before the Transport header
	 * skip them */
	offset = skb_network_offset(skb);
	offset += sizeof(*ip6);
	nexthdr = ip6->nexthdr;
	offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
	if (offset < 0)
		return 0;
	if (proto)
		*proto = nexthdr;
	switch (nexthdr) {
	case IPPROTO_TCP: {
		struct tcphdr _tcph, *th;

		th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
		if (th == NULL)
			break;

		ad->u.net->sport = th->source;
		ad->u.net->dport = th->dest;
		break;
	}
	case IPPROTO_UDP: {
		struct udphdr _udph, *uh;

		uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
		if (uh == NULL)
			break;

		ad->u.net->sport = uh->source;
		ad->u.net->dport = uh->dest;
		break;
	}
	case IPPROTO_DCCP: {
		struct dccp_hdr _dccph, *dh;

		dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
		if (dh == NULL)
			break;

		ad->u.net->sport = dh->dccph_sport;
		ad->u.net->dport = dh->dccph_dport;
		break;
	}
	case IPPROTO_SCTP: {
		struct sctphdr _sctph, *sh;

		sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
		if (sh == NULL)
			break;
		ad->u.net->sport = sh->source;
		ad->u.net->dport = sh->dest;
		break;
	}
	default:
		ret = -EINVAL;
	}
	return ret;
}
#endif


static inline void print_ipv6_addr(struct audit_buffer *ab,
				   struct in6_addr *addr, __be16 port,
				   char *name1, char *name2)
{
	if (!ipv6_addr_any(addr))
		audit_log_format(ab, " %s=%pI6c", name1, addr);
	if (port)
		audit_log_format(ab, " %s=%d", name2, ntohs(port));
}

static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
				   __be16 port, char *name1, char *name2)
{
	if (addr)
		audit_log_format(ab, " %s=%pI4", name1, &addr);
	if (port)
		audit_log_format(ab, " %s=%d", name2, ntohs(port));
}

/**
 * dump_common_audit_data - helper to dump common audit data
 * @a : common audit data
 *
 */
static void dump_common_audit_data(struct audit_buffer *ab,
				   struct common_audit_data *a)
{
	char comm[sizeof(current->comm)];

	/*
	 * To keep stack sizes in check force programers to notice if they
	 * start making this union too large!  See struct lsm_network_audit
	 * as an example of how to deal with large data.
	 */
	BUILD_BUG_ON(sizeof(a->u) > sizeof(void *)*2);

	audit_log_format(ab, " pid=%d comm=", task_pid_nr(current));
	audit_log_untrustedstring(ab, memcpy(comm, current->comm, sizeof(comm)));

	switch (a->type) {
	case LSM_AUDIT_DATA_NONE:
		return;
	case LSM_AUDIT_DATA_IPC:
		audit_log_format(ab, " key=%d ", a->u.ipc_id);
		break;
	case LSM_AUDIT_DATA_CAP:
		audit_log_format(ab, " capability=%d ", a->u.cap);
		break;
	case LSM_AUDIT_DATA_PATH: {
		struct inode *inode;

		audit_log_d_path(ab, " path=", &a->u.path);

		inode = d_backing_inode(a->u.path.dentry);
		if (inode) {
			audit_log_format(ab, " dev=");
			audit_log_untrustedstring(ab, inode->i_sb->s_id);
			audit_log_format(ab, " ino=%lu", inode->i_ino);
		}
		break;
	}
	case LSM_AUDIT_DATA_DENTRY: {
		struct inode *inode;

		audit_log_format(ab, " name=");
		audit_log_untrustedstring(ab, a->u.dentry->d_name.name);

		inode = d_backing_inode(a->u.dentry);
		if (inode) {
			audit_log_format(ab, " dev=");
			audit_log_untrustedstring(ab, inode->i_sb->s_id);
			audit_log_format(ab, " ino=%lu", inode->i_ino);
		}
		break;
	}
	case LSM_AUDIT_DATA_INODE: {
		struct dentry *dentry;
		struct inode *inode;

		inode = a->u.inode;
		dentry = d_find_alias(inode);
		if (dentry) {
			audit_log_format(ab, " name=");
			audit_log_untrustedstring(ab,
					 dentry->d_name.name);
			dput(dentry);
		}
		audit_log_format(ab, " dev=");
		audit_log_untrustedstring(ab, inode->i_sb->s_id);
		audit_log_format(ab, " ino=%lu", inode->i_ino);
		break;
	}
	case LSM_AUDIT_DATA_TASK: {
		struct task_struct *tsk = a->u.tsk;
		if (tsk) {
			pid_t pid = task_pid_nr(tsk);
			if (pid) {
				char comm[sizeof(tsk->comm)];
				audit_log_format(ab, " opid=%d ocomm=", pid);
				audit_log_untrustedstring(ab,
				    memcpy(comm, tsk->comm, sizeof(comm)));
			}
		}
		break;
	}
	case LSM_AUDIT_DATA_NET:
		if (a->u.net->sk) {
			struct sock *sk = a->u.net->sk;
			struct unix_sock *u;
			int len = 0;
			char *p = NULL;

			switch (sk->sk_family) {
			case AF_INET: {
				struct inet_sock *inet = inet_sk(sk);

				print_ipv4_addr(ab, inet->inet_rcv_saddr,
						inet->inet_sport,
						"laddr", "lport");
				print_ipv4_addr(ab, inet->inet_daddr,
						inet->inet_dport,
						"faddr", "fport");
				break;
			}
#if IS_ENABLED(CONFIG_IPV6)
			case AF_INET6: {
				struct inet_sock *inet = inet_sk(sk);

				print_ipv6_addr(ab, &sk->sk_v6_rcv_saddr,
						inet->inet_sport,
						"laddr", "lport");
				print_ipv6_addr(ab, &sk->sk_v6_daddr,
						inet->inet_dport,
						"faddr", "fport");
				break;
			}
#endif
			case AF_UNIX:
				u = unix_sk(sk);
				if (u->path.dentry) {
					audit_log_d_path(ab, " path=", &u->path);
					break;
				}
				if (!u->addr)
					break;
				len = u->addr->len-sizeof(short);
				p = &u->addr->name->sun_path[0];
				audit_log_format(ab, " path=");
				if (*p)
					audit_log_untrustedstring(ab, p);
				else
					audit_log_n_hex(ab, p, len);
				break;
			}
		}

		switch (a->u.net->family) {
		case AF_INET:
			print_ipv4_addr(ab, a->u.net->v4info.saddr,
					a->u.net->sport,
					"saddr", "src");
			print_ipv4_addr(ab, a->u.net->v4info.daddr,
					a->u.net->dport,
					"daddr", "dest");
			break;
		case AF_INET6:
			print_ipv6_addr(ab, &a->u.net->v6info.saddr,
					a->u.net->sport,
					"saddr", "src");
			print_ipv6_addr(ab, &a->u.net->v6info.daddr,
					a->u.net->dport,
					"daddr", "dest");
			break;
		}
		if (a->u.net->netif > 0) {
			struct net_device *dev;

			/* NOTE: we always use init's namespace */
			dev = dev_get_by_index(&init_net, a->u.net->netif);
			if (dev) {
				audit_log_format(ab, " netif=%s", dev->name);
				dev_put(dev);
			}
		}
		break;
#ifdef CONFIG_KEYS
	case LSM_AUDIT_DATA_KEY:
		audit_log_format(ab, " key_serial=%u", a->u.key_struct.key);
		if (a->u.key_struct.key_desc) {
			audit_log_format(ab, " key_desc=");
			audit_log_untrustedstring(ab, a->u.key_struct.key_desc);
		}
		break;
#endif
	case LSM_AUDIT_DATA_KMOD:
		audit_log_format(ab, " kmod=");
		audit_log_untrustedstring(ab, a->u.kmod_name);
		break;
	} /* switch (a->type) */
}

/**
 * common_lsm_audit - generic LSM auditing function
 * @a:  auxiliary audit data
 * @pre_audit: lsm-specific pre-audit callback
 * @post_audit: lsm-specific post-audit callback
 *
 * setup the audit buffer for common security information
 * uses callback to print LSM specific information
 */
void common_lsm_audit(struct common_audit_data *a,
	void (*pre_audit)(struct audit_buffer *, void *),
	void (*post_audit)(struct audit_buffer *, void *))
{
	struct audit_buffer *ab;

	if (a == NULL)
		return;
	/* we use GFP_ATOMIC so we won't sleep */
	ab = audit_log_start(current->audit_context, GFP_ATOMIC | __GFP_NOWARN,
			     AUDIT_AVC);

	if (ab == NULL)
		return;

	if (pre_audit)
		pre_audit(ab, a);

	dump_common_audit_data(ab, a);

	if (post_audit)
		post_audit(ab, a);

	audit_log_end(ab);
}
Commit	Line	Data
	1	/*
	2	* common LSM auditing functions
	3	*
	4	* Based on code written for SELinux by :
	5	* Stephen Smalley, <sds@epoch.ncsc.mil>
	6	* James Morris <jmorris@redhat.com>
	7	* Author : Etienne Basset, <etienne.basset@ensta.org>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2,
	11	* as published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/types.h>
	15	#include <linux/stddef.h>
	16	#include <linux/kernel.h>
	17	#include <linux/gfp.h>
	18	#include <linux/fs.h>
	19	#include <linux/init.h>
	20	#include <net/sock.h>
	21	#include <linux/un.h>
	22	#include <net/af_unix.h>
	23	#include <linux/audit.h>
	24	#include <linux/ipv6.h>
	25	#include <linux/ip.h>
	26	#include <net/ip.h>
	27	#include <net/ipv6.h>
	28	#include <linux/tcp.h>
	29	#include <linux/udp.h>
	30	#include <linux/dccp.h>
	31	#include <linux/sctp.h>
	32	#include <linux/lsm_audit.h>
	33
	34	/**
	35	* ipv4_skb_to_auditdata : fill auditdata from skb
	36	* @skb : the skb
	37	* @ad : the audit data to fill
	38	* @proto : the layer 4 protocol
	39	*
	40	* return 0 on success
	41	*/
	42	int ipv4_skb_to_auditdata(struct sk_buff *skb,
	43	struct common_audit_data ad, u8 proto)
	44	{
	45	int ret = 0;
	46	struct iphdr *ih;
	47
	48	ih = ip_hdr(skb);
	49	if (ih == NULL)
	50	return -EINVAL;
	51
	52	ad->u.net->v4info.saddr = ih->saddr;
	53	ad->u.net->v4info.daddr = ih->daddr;
	54
	55	if (proto)
	56	*proto = ih->protocol;
	57	/* non initial fragment */
	58	if (ntohs(ih->frag_off) & IP_OFFSET)
	59	return 0;
	60
	61	switch (ih->protocol) {
	62	case IPPROTO_TCP: {
	63	struct tcphdr *th = tcp_hdr(skb);
	64	if (th == NULL)
	65	break;
	66
	67	ad->u.net->sport = th->source;
	68	ad->u.net->dport = th->dest;
	69	break;
	70	}
	71	case IPPROTO_UDP: {
	72	struct udphdr *uh = udp_hdr(skb);
	73	if (uh == NULL)
	74	break;
	75
	76	ad->u.net->sport = uh->source;
	77	ad->u.net->dport = uh->dest;
	78	break;
	79	}
	80	case IPPROTO_DCCP: {
	81	struct dccp_hdr *dh = dccp_hdr(skb);
	82	if (dh == NULL)
	83	break;
	84
	85	ad->u.net->sport = dh->dccph_sport;
	86	ad->u.net->dport = dh->dccph_dport;
	87	break;
	88	}
	89	case IPPROTO_SCTP: {
	90	struct sctphdr *sh = sctp_hdr(skb);
	91	if (sh == NULL)
	92	break;
	93	ad->u.net->sport = sh->source;
	94	ad->u.net->dport = sh->dest;
	95	break;
	96	}
	97	default:
	98	ret = -EINVAL;
	99	}
	100	return ret;
	101	}
	102	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	103	/**
	104	* ipv6_skb_to_auditdata : fill auditdata from skb
	105	* @skb : the skb
	106	* @ad : the audit data to fill
	107	* @proto : the layer 4 protocol
	108	*
	109	* return 0 on success
	110	*/
	111	int ipv6_skb_to_auditdata(struct sk_buff *skb,
	112	struct common_audit_data ad, u8 proto)
	113	{
	114	int offset, ret = 0;
	115	struct ipv6hdr *ip6;
	116	u8 nexthdr;
	117	__be16 frag_off;
	118
	119	ip6 = ipv6_hdr(skb);
	120	if (ip6 == NULL)
	121	return -EINVAL;
	122	ad->u.net->v6info.saddr = ip6->saddr;
	123	ad->u.net->v6info.daddr = ip6->daddr;
	124	ret = 0;
	125	/* IPv6 can have several extension header before the Transport header
	126	* skip them */
	127	offset = skb_network_offset(skb);
	128	offset += sizeof(*ip6);
	129	nexthdr = ip6->nexthdr;
	130	offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
	131	if (offset < 0)
	132	return 0;
	133	if (proto)
	134	*proto = nexthdr;
	135	switch (nexthdr) {
	136	case IPPROTO_TCP: {
	137	struct tcphdr _tcph, *th;
	138
	139	th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
	140	if (th == NULL)
	141	break;
	142
	143	ad->u.net->sport = th->source;
	144	ad->u.net->dport = th->dest;
	145	break;
	146	}
	147	case IPPROTO_UDP: {
	148	struct udphdr _udph, *uh;
	149
	150	uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
	151	if (uh == NULL)
	152	break;
	153
	154	ad->u.net->sport = uh->source;
	155	ad->u.net->dport = uh->dest;
	156	break;
	157	}
	158	case IPPROTO_DCCP: {
	159	struct dccp_hdr _dccph, *dh;
	160
	161	dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
	162	if (dh == NULL)
	163	break;
	164
	165	ad->u.net->sport = dh->dccph_sport;
	166	ad->u.net->dport = dh->dccph_dport;
	167	break;
	168	}
	169	case IPPROTO_SCTP: {
	170	struct sctphdr _sctph, *sh;
	171
	172	sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
	173	if (sh == NULL)
	174	break;
	175	ad->u.net->sport = sh->source;
	176	ad->u.net->dport = sh->dest;
	177	break;
	178	}
	179	default:
	180	ret = -EINVAL;
	181	}
	182	return ret;
	183	}
	184	#endif
	185
	186
	187	static inline void print_ipv6_addr(struct audit_buffer *ab,
	188	struct in6_addr *addr, __be16 port,
	189	char name1, char name2)
	190	{
	191	if (!ipv6_addr_any(addr))
	192	audit_log_format(ab, " %s=%pI6c", name1, addr);
	193	if (port)
	194	audit_log_format(ab, " %s=%d", name2, ntohs(port));
	195	}
	196
	197	static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
	198	__be16 port, char name1, char name2)
	199	{
	200	if (addr)
	201	audit_log_format(ab, " %s=%pI4", name1, &addr);
	202	if (port)
	203	audit_log_format(ab, " %s=%d", name2, ntohs(port));
	204	}
	205
	206	/**
	207	* dump_common_audit_data - helper to dump common audit data
	208	* @a : common audit data
	209	*
	210	*/
	211	static void dump_common_audit_data(struct audit_buffer *ab,
	212	struct common_audit_data *a)
	213	{
	214	char comm[sizeof(current->comm)];
	215
	216	/*
	217	* To keep stack sizes in check force programers to notice if they
	218	* start making this union too large! See struct lsm_network_audit
	219	* as an example of how to deal with large data.
	220	*/
	221	BUILD_BUG_ON(sizeof(a->u) > sizeof(void )2);
	222
	223	audit_log_format(ab, " pid=%d comm=", task_pid_nr(current));
	224	audit_log_untrustedstring(ab, memcpy(comm, current->comm, sizeof(comm)));
	225
	226	switch (a->type) {
	227	case LSM_AUDIT_DATA_NONE:
	228	return;
	229	case LSM_AUDIT_DATA_IPC:
	230	audit_log_format(ab, " key=%d ", a->u.ipc_id);
	231	break;
	232	case LSM_AUDIT_DATA_CAP:
	233	audit_log_format(ab, " capability=%d ", a->u.cap);
	234	break;
	235	case LSM_AUDIT_DATA_PATH: {
	236	struct inode *inode;
	237
	238	audit_log_d_path(ab, " path=", &a->u.path);
	239
	240	inode = d_backing_inode(a->u.path.dentry);
	241	if (inode) {
	242	audit_log_format(ab, " dev=");
	243	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	244	audit_log_format(ab, " ino=%lu", inode->i_ino);
	245	}
	246	break;
	247	}
	248	case LSM_AUDIT_DATA_DENTRY: {
	249	struct inode *inode;
	250
	251	audit_log_format(ab, " name=");
	252	audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
	253
	254	inode = d_backing_inode(a->u.dentry);
	255	if (inode) {
	256	audit_log_format(ab, " dev=");
	257	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	258	audit_log_format(ab, " ino=%lu", inode->i_ino);
	259	}
	260	break;
	261	}
	262	case LSM_AUDIT_DATA_INODE: {
	263	struct dentry *dentry;
	264	struct inode *inode;
	265
	266	inode = a->u.inode;
	267	dentry = d_find_alias(inode);
	268	if (dentry) {
	269	audit_log_format(ab, " name=");
	270	audit_log_untrustedstring(ab,
	271	dentry->d_name.name);
	272	dput(dentry);
	273	}
	274	audit_log_format(ab, " dev=");
	275	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	276	audit_log_format(ab, " ino=%lu", inode->i_ino);
	277	break;
	278	}
	279	case LSM_AUDIT_DATA_TASK: {
	280	struct task_struct *tsk = a->u.tsk;
	281	if (tsk) {
	282	pid_t pid = task_pid_nr(tsk);
	283	if (pid) {
	284	char comm[sizeof(tsk->comm)];
	285	audit_log_format(ab, " opid=%d ocomm=", pid);
	286	audit_log_untrustedstring(ab,
	287	memcpy(comm, tsk->comm, sizeof(comm)));
	288	}
	289	}
	290	break;
	291	}
	292	case LSM_AUDIT_DATA_NET:
	293	if (a->u.net->sk) {
	294	struct sock *sk = a->u.net->sk;
	295	struct unix_sock *u;
	296	int len = 0;
	297	char *p = NULL;
	298
	299	switch (sk->sk_family) {
	300	case AF_INET: {
	301	struct inet_sock *inet = inet_sk(sk);
	302
	303	print_ipv4_addr(ab, inet->inet_rcv_saddr,
	304	inet->inet_sport,
	305	"laddr", "lport");
	306	print_ipv4_addr(ab, inet->inet_daddr,
	307	inet->inet_dport,
	308	"faddr", "fport");
	309	break;
	310	}
	311	#if IS_ENABLED(CONFIG_IPV6)
	312	case AF_INET6: {
	313	struct inet_sock *inet = inet_sk(sk);
	314
	315	print_ipv6_addr(ab, &sk->sk_v6_rcv_saddr,
	316	inet->inet_sport,
	317	"laddr", "lport");
	318	print_ipv6_addr(ab, &sk->sk_v6_daddr,
	319	inet->inet_dport,
	320	"faddr", "fport");
	321	break;
	322	}
	323	#endif
	324	case AF_UNIX:
	325	u = unix_sk(sk);
	326	if (u->path.dentry) {
	327	audit_log_d_path(ab, " path=", &u->path);
	328	break;
	329	}
	330	if (!u->addr)
	331	break;
	332	len = u->addr->len-sizeof(short);
	333	p = &u->addr->name->sun_path[0];
	334	audit_log_format(ab, " path=");
	335	if (*p)
	336	audit_log_untrustedstring(ab, p);
	337	else
	338	audit_log_n_hex(ab, p, len);
	339	break;
	340	}
	341	}
	342
	343	switch (a->u.net->family) {
	344	case AF_INET:
	345	print_ipv4_addr(ab, a->u.net->v4info.saddr,
	346	a->u.net->sport,
	347	"saddr", "src");
	348	print_ipv4_addr(ab, a->u.net->v4info.daddr,
	349	a->u.net->dport,
	350	"daddr", "dest");
	351	break;
	352	case AF_INET6:
	353	print_ipv6_addr(ab, &a->u.net->v6info.saddr,
	354	a->u.net->sport,
	355	"saddr", "src");
	356	print_ipv6_addr(ab, &a->u.net->v6info.daddr,
	357	a->u.net->dport,
	358	"daddr", "dest");
	359	break;
	360	}
	361	if (a->u.net->netif > 0) {
	362	struct net_device *dev;
	363
	364	/* NOTE: we always use init's namespace */
	365	dev = dev_get_by_index(&init_net, a->u.net->netif);
	366	if (dev) {
	367	audit_log_format(ab, " netif=%s", dev->name);
	368	dev_put(dev);
	369	}
	370	}
	371	break;
	372	#ifdef CONFIG_KEYS
	373	case LSM_AUDIT_DATA_KEY:
	374	audit_log_format(ab, " key_serial=%u", a->u.key_struct.key);
	375	if (a->u.key_struct.key_desc) {
	376	audit_log_format(ab, " key_desc=");
	377	audit_log_untrustedstring(ab, a->u.key_struct.key_desc);
	378	}
	379	break;
	380	#endif
	381	case LSM_AUDIT_DATA_KMOD:
	382	audit_log_format(ab, " kmod=");
	383	audit_log_untrustedstring(ab, a->u.kmod_name);
	384	break;
	385	} /* switch (a->type) */
	386	}
	387
	388	/**
	389	* common_lsm_audit - generic LSM auditing function
	390	* @a: auxiliary audit data
	391	* @pre_audit: lsm-specific pre-audit callback
	392	* @post_audit: lsm-specific post-audit callback
	393	*
	394	* setup the audit buffer for common security information
	395	* uses callback to print LSM specific information
	396	*/
	397	void common_lsm_audit(struct common_audit_data *a,
	398	void (pre_audit)(struct audit_buffer , void *),
	399	void (post_audit)(struct audit_buffer , void *))
	400	{
	401	struct audit_buffer *ab;
	402
	403	if (a == NULL)
	404	return;
	405	/* we use GFP_ATOMIC so we won't sleep */
	406	ab = audit_log_start(current->audit_context, GFP_ATOMIC \| __GFP_NOWARN,
	407	AUDIT_AVC);
	408
	409	if (ab == NULL)
	410	return;
	411
	412	if (pre_audit)
	413	pre_audit(ab, a);
	414
	415	dump_common_audit_data(ab, a);
	416
	417	if (post_audit)
	418	post_audit(ab, a);
	419
	420	audit_log_end(ab);
	421	}