[net-next-2.6.git] / net / sunrpc / svcauth_unix.c

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/sunrpc/types.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/svcauth.h>
#include <linux/err.h>
#include <linux/seq_file.h>
#include <linux/hash.h>
#include <linux/string.h>

#define RPCDBG_FACILITY	RPCDBG_AUTH


/*
 * AUTHUNIX and AUTHNULL credentials are both handled here.
 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
 * are always nobody (-2).  i.e. we do the same IP address checks for
 * AUTHNULL as for AUTHUNIX, and that is done here.
 */


struct unix_domain {
	struct auth_domain	h;
	int	addr_changes;
	/* other stuff later */
};

extern struct auth_ops svcauth_unix;

struct auth_domain *unix_domain_find(char *name)
{
	struct auth_domain *rv;
	struct unix_domain *new = NULL;

	rv = auth_domain_lookup(name, NULL);
	while(1) {
		if (rv) {
			if (new && rv != &new->h)
				auth_domain_put(&new->h);

			if (rv->flavour != &svcauth_unix) {
				auth_domain_put(rv);
				return NULL;
			}
			return rv;
		}

		new = kmalloc(sizeof(*new), GFP_KERNEL);
		if (new == NULL)
			return NULL;
		kref_init(&new->h.ref);
		new->h.name = kstrdup(name, GFP_KERNEL);
		new->h.flavour = &svcauth_unix;
		new->addr_changes = 0;
		rv = auth_domain_lookup(name, &new->h);
	}
}

static void svcauth_unix_domain_release(struct auth_domain *dom)
{
	struct unix_domain *ud = container_of(dom, struct unix_domain, h);

	kfree(dom->name);
	kfree(ud);
}


/**************************************************
 * cache for IP address to unix_domain
 * as needed by AUTH_UNIX
 */
#define	IP_HASHBITS	8
#define	IP_HASHMAX	(1<<IP_HASHBITS)
#define	IP_HASHMASK	(IP_HASHMAX-1)

struct ip_map {
	struct cache_head	h;
	char			m_class[8]; /* e.g. "nfsd" */
	struct in_addr		m_addr;
	struct unix_domain	*m_client;
	int			m_add_change;
};
static struct cache_head	*ip_table[IP_HASHMAX];

static void ip_map_put(struct kref *kref)
{
	struct cache_head *item = container_of(kref, struct cache_head, ref);
	struct ip_map *im = container_of(item, struct ip_map,h);

	if (test_bit(CACHE_VALID, &item->flags) &&
	    !test_bit(CACHE_NEGATIVE, &item->flags))
		auth_domain_put(&im->m_client->h);
	kfree(im);
}

#if IP_HASHBITS == 8
/* hash_long on a 64 bit machine is currently REALLY BAD for
 * IP addresses in reverse-endian (i.e. on a little-endian machine).
 * So use a trivial but reliable hash instead
 */
static inline int hash_ip(unsigned long ip)
{
	int hash = ip ^ (ip>>16);
	return (hash ^ (hash>>8)) & 0xff;
}
#endif
static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
{
	struct ip_map *orig = container_of(corig, struct ip_map, h);
	struct ip_map *new = container_of(cnew, struct ip_map, h);
	return strcmp(orig->m_class, new->m_class) == 0
		&& orig->m_addr.s_addr == new->m_addr.s_addr;
}
static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
{
	struct ip_map *new = container_of(cnew, struct ip_map, h);
	struct ip_map *item = container_of(citem, struct ip_map, h);

	strcpy(new->m_class, item->m_class);
	new->m_addr.s_addr = item->m_addr.s_addr;
}
static void update(struct cache_head *cnew, struct cache_head *citem)
{
	struct ip_map *new = container_of(cnew, struct ip_map, h);
	struct ip_map *item = container_of(citem, struct ip_map, h);

	kref_get(&item->m_client->h.ref);
	new->m_client = item->m_client;
	new->m_add_change = item->m_add_change;
}
static struct cache_head *ip_map_alloc(void)
{
	struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
	if (i)
		return &i->h;
	else
		return NULL;
}

static void ip_map_request(struct cache_detail *cd,
				  struct cache_head *h,
				  char **bpp, int *blen)
{
	char text_addr[20];
	struct ip_map *im = container_of(h, struct ip_map, h);
	__u32 addr = im->m_addr.s_addr;
	
	snprintf(text_addr, 20, "%u.%u.%u.%u",
		 ntohl(addr) >> 24 & 0xff,
		 ntohl(addr) >> 16 & 0xff,
		 ntohl(addr) >>  8 & 0xff,
		 ntohl(addr) >>  0 & 0xff);

	qword_add(bpp, blen, im->m_class);
	qword_add(bpp, blen, text_addr);
	(*bpp)[-1] = '\n';
}

static struct ip_map *ip_map_lookup(char *class, struct in_addr addr);
static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);

static int ip_map_parse(struct cache_detail *cd,
			  char *mesg, int mlen)
{
	/* class ipaddress [domainname] */
	/* should be safe just to use the start of the input buffer
	 * for scratch: */
	char *buf = mesg;
	int len;
	int b1,b2,b3,b4;
	char c;
	char class[8];
	struct in_addr addr;
	int err;

	struct ip_map *ipmp;
	struct auth_domain *dom;
	time_t expiry;

	if (mesg[mlen-1] != '\n')
		return -EINVAL;
	mesg[mlen-1] = 0;

	/* class */
	len = qword_get(&mesg, class, sizeof(class));
	if (len <= 0) return -EINVAL;

	/* ip address */
	len = qword_get(&mesg, buf, mlen);
	if (len <= 0) return -EINVAL;

	if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
		return -EINVAL;
	
	expiry = get_expiry(&mesg);
	if (expiry ==0)
		return -EINVAL;

	/* domainname, or empty for NEGATIVE */
	len = qword_get(&mesg, buf, mlen);
	if (len < 0) return -EINVAL;

	if (len) {
		dom = unix_domain_find(buf);
		if (dom == NULL)
			return -ENOENT;
	} else
		dom = NULL;

	addr.s_addr =
		htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);

	ipmp = ip_map_lookup(class,addr);
	if (ipmp) {
		err = ip_map_update(ipmp,
			     container_of(dom, struct unix_domain, h),
			     expiry);
	} else
		err = -ENOMEM;

	if (dom)
		auth_domain_put(dom);

	cache_flush();
	return err;
}

static int ip_map_show(struct seq_file *m,
		       struct cache_detail *cd,
		       struct cache_head *h)
{
	struct ip_map *im;
	struct in_addr addr;
	char *dom = "-no-domain-";

	if (h == NULL) {
		seq_puts(m, "#class IP domain\n");
		return 0;
	}
	im = container_of(h, struct ip_map, h);
	/* class addr domain */
	addr = im->m_addr;

	if (test_bit(CACHE_VALID, &h->flags) && 
	    !test_bit(CACHE_NEGATIVE, &h->flags))
		dom = im->m_client->h.name;

	seq_printf(m, "%s %d.%d.%d.%d %s\n",
		   im->m_class,
		   htonl(addr.s_addr) >> 24 & 0xff,
		   htonl(addr.s_addr) >> 16 & 0xff,
		   htonl(addr.s_addr) >>  8 & 0xff,
		   htonl(addr.s_addr) >>  0 & 0xff,
		   dom
		   );
	return 0;
}
	

struct cache_detail ip_map_cache = {
	.owner		= THIS_MODULE,
	.hash_size	= IP_HASHMAX,
	.hash_table	= ip_table,
	.name		= "auth.unix.ip",
	.cache_put	= ip_map_put,
	.cache_request	= ip_map_request,
	.cache_parse	= ip_map_parse,
	.cache_show	= ip_map_show,
	.match		= ip_map_match,
	.init		= ip_map_init,
	.update		= update,
	.alloc		= ip_map_alloc,
};

static struct ip_map *ip_map_lookup(char *class, struct in_addr addr)
{
	struct ip_map ip;
	struct cache_head *ch;

	strcpy(ip.m_class, class);
	ip.m_addr = addr;
	ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
				 hash_str(class, IP_HASHBITS) ^
				 hash_ip((unsigned long)addr.s_addr));

	if (ch)
		return container_of(ch, struct ip_map, h);
	else
		return NULL;
}

static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
{
	struct ip_map ip;
	struct cache_head *ch;

	ip.m_client = udom;
	ip.h.flags = 0;
	if (!udom)
		set_bit(CACHE_NEGATIVE, &ip.h.flags);
	else {
		ip.m_add_change = udom->addr_changes;
		/* if this is from the legacy set_client system call,
		 * we need m_add_change to be one higher
		 */
		if (expiry == NEVER)
			ip.m_add_change++;
	}
	ip.h.expiry_time = expiry;
	ch = sunrpc_cache_update(&ip_map_cache,
				 &ip.h, &ipm->h,
				 hash_str(ipm->m_class, IP_HASHBITS) ^
				 hash_ip((unsigned long)ipm->m_addr.s_addr));
	if (!ch)
		return -ENOMEM;
	cache_put(ch, &ip_map_cache);
	return 0;
}

int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
{
	struct unix_domain *udom;
	struct ip_map *ipmp;

	if (dom->flavour != &svcauth_unix)
		return -EINVAL;
	udom = container_of(dom, struct unix_domain, h);
	ipmp = ip_map_lookup("nfsd", addr);

	if (ipmp)
		return ip_map_update(ipmp, udom, NEVER);
	else
		return -ENOMEM;
}

int auth_unix_forget_old(struct auth_domain *dom)
{
	struct unix_domain *udom;
	
	if (dom->flavour != &svcauth_unix)
		return -EINVAL;
	udom = container_of(dom, struct unix_domain, h);
	udom->addr_changes++;
	return 0;
}

struct auth_domain *auth_unix_lookup(struct in_addr addr)
{
	struct ip_map key, *ipm;
	struct auth_domain *rv;

	strcpy(key.m_class, "nfsd");
	key.m_addr = addr;

	ipm = ip_map_lookup("nfsd", addr);

	if (!ipm)
		return NULL;
	if (cache_check(&ip_map_cache, &ipm->h, NULL))
		return NULL;

	if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
		if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
			auth_domain_put(&ipm->m_client->h);
		rv = NULL;
	} else {
		rv = &ipm->m_client->h;
		kref_get(&rv->ref);
	}
	cache_put(&ipm->h, &ip_map_cache);
	return rv;
}

void svcauth_unix_purge(void)
{
	cache_purge(&ip_map_cache);
}

static int
svcauth_unix_set_client(struct svc_rqst *rqstp)
{
	struct ip_map *ipm;

	rqstp->rq_client = NULL;
	if (rqstp->rq_proc == 0)
		return SVC_OK;

	ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
			    rqstp->rq_addr.sin_addr);

	if (ipm == NULL)
		return SVC_DENIED;

	switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
		default:
			BUG();
		case -EAGAIN:
			return SVC_DROP;
		case -ENOENT:
			return SVC_DENIED;
		case 0:
			rqstp->rq_client = &ipm->m_client->h;
			kref_get(&rqstp->rq_client->ref);
			cache_put(&ipm->h, &ip_map_cache);
			break;
	}
	return SVC_OK;
}

static int
svcauth_null_accept(struct svc_rqst *rqstp, u32 *authp)
{
	struct kvec	*argv = &rqstp->rq_arg.head[0];
	struct kvec	*resv = &rqstp->rq_res.head[0];
	struct svc_cred	*cred = &rqstp->rq_cred;

	cred->cr_group_info = NULL;
	rqstp->rq_client = NULL;

	if (argv->iov_len < 3*4)
		return SVC_GARBAGE;

	if (svc_getu32(argv) != 0) { 
		dprintk("svc: bad null cred\n");
		*authp = rpc_autherr_badcred;
		return SVC_DENIED;
	}
	if (svc_getu32(argv) != RPC_AUTH_NULL || svc_getu32(argv) != 0) {
		dprintk("svc: bad null verf\n");
		*authp = rpc_autherr_badverf;
		return SVC_DENIED;
	}

	/* Signal that mapping to nobody uid/gid is required */
	cred->cr_uid = (uid_t) -1;
	cred->cr_gid = (gid_t) -1;
	cred->cr_group_info = groups_alloc(0);
	if (cred->cr_group_info == NULL)
		return SVC_DROP; /* kmalloc failure - client must retry */

	/* Put NULL verifier */
	svc_putu32(resv, RPC_AUTH_NULL);
	svc_putu32(resv, 0);

	return SVC_OK;
}

static int
svcauth_null_release(struct svc_rqst *rqstp)
{
	if (rqstp->rq_client)
		auth_domain_put(rqstp->rq_client);
	rqstp->rq_client = NULL;
	if (rqstp->rq_cred.cr_group_info)
		put_group_info(rqstp->rq_cred.cr_group_info);
	rqstp->rq_cred.cr_group_info = NULL;

	return 0; /* don't drop */
}


struct auth_ops svcauth_null = {
	.name		= "null",
	.owner		= THIS_MODULE,
	.flavour	= RPC_AUTH_NULL,
	.accept 	= svcauth_null_accept,
	.release	= svcauth_null_release,
	.set_client	= svcauth_unix_set_client,
};


static int
svcauth_unix_accept(struct svc_rqst *rqstp, u32 *authp)
{
	struct kvec	*argv = &rqstp->rq_arg.head[0];
	struct kvec	*resv = &rqstp->rq_res.head[0];
	struct svc_cred	*cred = &rqstp->rq_cred;
	u32		slen, i;
	int		len   = argv->iov_len;

	cred->cr_group_info = NULL;
	rqstp->rq_client = NULL;

	if ((len -= 3*4) < 0)
		return SVC_GARBAGE;

	svc_getu32(argv);			/* length */
	svc_getu32(argv);			/* time stamp */
	slen = XDR_QUADLEN(ntohl(svc_getu32(argv)));	/* machname length */
	if (slen > 64 || (len -= (slen + 3)*4) < 0)
		goto badcred;
	argv->iov_base = (void*)((u32*)argv->iov_base + slen);	/* skip machname */
	argv->iov_len -= slen*4;

	cred->cr_uid = ntohl(svc_getu32(argv));		/* uid */
	cred->cr_gid = ntohl(svc_getu32(argv));		/* gid */
	slen = ntohl(svc_getu32(argv));			/* gids length */
	if (slen > 16 || (len -= (slen + 2)*4) < 0)
		goto badcred;
	cred->cr_group_info = groups_alloc(slen);
	if (cred->cr_group_info == NULL)
		return SVC_DROP;
	for (i = 0; i < slen; i++)
		GROUP_AT(cred->cr_group_info, i) = ntohl(svc_getu32(argv));

	if (svc_getu32(argv) != RPC_AUTH_NULL || svc_getu32(argv) != 0) {
		*authp = rpc_autherr_badverf;
		return SVC_DENIED;
	}

	/* Put NULL verifier */
	svc_putu32(resv, RPC_AUTH_NULL);
	svc_putu32(resv, 0);

	return SVC_OK;

badcred:
	*authp = rpc_autherr_badcred;
	return SVC_DENIED;
}

static int
svcauth_unix_release(struct svc_rqst *rqstp)
{
	/* Verifier (such as it is) is already in place.
	 */
	if (rqstp->rq_client)
		auth_domain_put(rqstp->rq_client);
	rqstp->rq_client = NULL;
	if (rqstp->rq_cred.cr_group_info)
		put_group_info(rqstp->rq_cred.cr_group_info);
	rqstp->rq_cred.cr_group_info = NULL;

	return 0;
}


struct auth_ops svcauth_unix = {
	.name		= "unix",
	.owner		= THIS_MODULE,
	.flavour	= RPC_AUTH_UNIX,
	.accept 	= svcauth_unix_accept,
	.release	= svcauth_unix_release,
	.domain_release	= svcauth_unix_domain_release,
	.set_client	= svcauth_unix_set_client,
};
Commit	Line	Data
1da177e4 LT	1	#include <linux/types.h>
	2	#include <linux/sched.h>
	3	#include <linux/module.h>
	4	#include <linux/sunrpc/types.h>
	5	#include <linux/sunrpc/xdr.h>
	6	#include <linux/sunrpc/svcsock.h>
	7	#include <linux/sunrpc/svcauth.h>
	8	#include <linux/err.h>
	9	#include <linux/seq_file.h>
	10	#include <linux/hash.h>
543537bd	11	#include <linux/string.h>
1da177e4 LT	12
	13	#define RPCDBG_FACILITY RPCDBG_AUTH
	14
	15
	16	/*
	17	* AUTHUNIX and AUTHNULL credentials are both handled here.
	18	* AUTHNULL is treated just like AUTHUNIX except that the uid/gid
	19	* are always nobody (-2). i.e. we do the same IP address checks for
	20	* AUTHNULL as for AUTHUNIX, and that is done here.
	21	*/
	22
	23
1da177e4 LT	24	struct unix_domain {
	25	struct auth_domain h;
	26	int addr_changes;
	27	/* other stuff later */
	28	};
	29
efc36aa5 N	30	extern struct auth_ops svcauth_unix;
efc36aa5 N	31
1da177e4 LT	32	struct auth_domain unix_domain_find(char name)
1da177e4 LT	33	{
efc36aa5 N	34	struct auth_domain *rv;
	35	struct unix_domain *new = NULL;
	36
	37	rv = auth_domain_lookup(name, NULL);
	38	while(1) {
ad1b5229 N	39	if (rv) {
	40	if (new && rv != &new->h)
	41	auth_domain_put(&new->h);
	42
	43	if (rv->flavour != &svcauth_unix) {
	44	auth_domain_put(rv);
	45	return NULL;
	46	}
efc36aa5 N	47	return rv;
efc36aa5 N	48	}
efc36aa5 N	49
	50	new = kmalloc(sizeof(*new), GFP_KERNEL);
	51	if (new == NULL)
	52	return NULL;
	53	kref_init(&new->h.ref);
	54	new->h.name = kstrdup(name, GFP_KERNEL);
	55	new->h.flavour = &svcauth_unix;
	56	new->addr_changes = 0;
	57	rv = auth_domain_lookup(name, &new->h);
1da177e4	58	}
1da177e4 LT	59	}
	60
	61	static void svcauth_unix_domain_release(struct auth_domain *dom)
	62	{
	63	struct unix_domain *ud = container_of(dom, struct unix_domain, h);
	64
	65	kfree(dom->name);
	66	kfree(ud);
	67	}
	68
	69
	70	/**************************************************
	71	* cache for IP address to unix_domain
	72	* as needed by AUTH_UNIX
	73	*/
	74	#define IP_HASHBITS 8
	75	#define IP_HASHMAX (1<<IP_HASHBITS)
	76	#define IP_HASHMASK (IP_HASHMAX-1)
	77
	78	struct ip_map {
	79	struct cache_head h;
	80	char m_class[8]; /* e.g. "nfsd" */
	81	struct in_addr m_addr;
	82	struct unix_domain *m_client;
	83	int m_add_change;
	84	};
	85	static struct cache_head *ip_table[IP_HASHMAX];
	86
baab935f	87	static void ip_map_put(struct kref *kref)
1da177e4	88	{
baab935f	89	struct cache_head *item = container_of(kref, struct cache_head, ref);
1da177e4	90	struct ip_map *im = container_of(item, struct ip_map,h);
baab935f N	91
	92	if (test_bit(CACHE_VALID, &item->flags) &&
	93	!test_bit(CACHE_NEGATIVE, &item->flags))
	94	auth_domain_put(&im->m_client->h);
	95	kfree(im);
1da177e4 LT	96	}
1da177e4 LT	97
1f1e030b N	98	#if IP_HASHBITS == 8
	99	/* hash_long on a 64 bit machine is currently REALLY BAD for
	100	* IP addresses in reverse-endian (i.e. on a little-endian machine).
	101	* So use a trivial but reliable hash instead
	102	*/
	103	static inline int hash_ip(unsigned long ip)
	104	{
	105	int hash = ip ^ (ip>>16);
	106	return (hash ^ (hash>>8)) & 0xff;
	107	}
	108	#endif
1a9917c2	109	static int ip_map_match(struct cache_head corig, struct cache_head cnew)
1da177e4	110	{
1a9917c2 N	111	struct ip_map *orig = container_of(corig, struct ip_map, h);
	112	struct ip_map *new = container_of(cnew, struct ip_map, h);
	113	return strcmp(orig->m_class, new->m_class) == 0
	114	&& orig->m_addr.s_addr == new->m_addr.s_addr;
1da177e4	115	}
1a9917c2	116	static void ip_map_init(struct cache_head cnew, struct cache_head citem)
1da177e4	117	{
1a9917c2 N	118	struct ip_map *new = container_of(cnew, struct ip_map, h);
	119	struct ip_map *item = container_of(citem, struct ip_map, h);
	120
1da177e4 LT	121	strcpy(new->m_class, item->m_class);
	122	new->m_addr.s_addr = item->m_addr.s_addr;
	123	}
1a9917c2	124	static void update(struct cache_head cnew, struct cache_head citem)
1da177e4	125	{
1a9917c2 N	126	struct ip_map *new = container_of(cnew, struct ip_map, h);
	127	struct ip_map *item = container_of(citem, struct ip_map, h);
	128
efc36aa5	129	kref_get(&item->m_client->h.ref);
1da177e4 LT	130	new->m_client = item->m_client;
	131	new->m_add_change = item->m_add_change;
	132	}
1a9917c2 N	133	static struct cache_head *ip_map_alloc(void)
	134	{
	135	struct ip_map i = kmalloc(sizeof(i), GFP_KERNEL);
	136	if (i)
	137	return &i->h;
	138	else
	139	return NULL;
	140	}
1da177e4 LT	141
	142	static void ip_map_request(struct cache_detail *cd,
	143	struct cache_head *h,
	144	char *bpp, int blen)
	145	{
	146	char text_addr[20];
	147	struct ip_map *im = container_of(h, struct ip_map, h);
	148	__u32 addr = im->m_addr.s_addr;
	149
	150	snprintf(text_addr, 20, "%u.%u.%u.%u",
	151	ntohl(addr) >> 24 & 0xff,
	152	ntohl(addr) >> 16 & 0xff,
	153	ntohl(addr) >> 8 & 0xff,
	154	ntohl(addr) >> 0 & 0xff);
	155
	156	qword_add(bpp, blen, im->m_class);
	157	qword_add(bpp, blen, text_addr);
	158	(*bpp)[-1] = '\n';
	159	}
	160
1a9917c2 N	161	static struct ip_map ip_map_lookup(char class, struct in_addr addr);
1a9917c2 N	162	static int ip_map_update(struct ip_map ipm, struct unix_domain udom, time_t expiry);
1da177e4 LT	163
	164	static int ip_map_parse(struct cache_detail *cd,
	165	char *mesg, int mlen)
	166	{
	167	/* class ipaddress [domainname] */
	168	/* should be safe just to use the start of the input buffer
	169	* for scratch: */
	170	char *buf = mesg;
	171	int len;
	172	int b1,b2,b3,b4;
	173	char c;
1a9917c2 N	174	char class[8];
	175	struct in_addr addr;
	176	int err;
	177
	178	struct ip_map *ipmp;
1da177e4 LT	179	struct auth_domain *dom;
	180	time_t expiry;
	181
	182	if (mesg[mlen-1] != '\n')
	183	return -EINVAL;
	184	mesg[mlen-1] = 0;
	185
	186	/* class */
1a9917c2	187	len = qword_get(&mesg, class, sizeof(class));
1da177e4 LT	188	if (len <= 0) return -EINVAL;
	189
	190	/* ip address */
	191	len = qword_get(&mesg, buf, mlen);
	192	if (len <= 0) return -EINVAL;
	193
	194	if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
	195	return -EINVAL;
	196
	197	expiry = get_expiry(&mesg);
	198	if (expiry ==0)
	199	return -EINVAL;
	200
	201	/* domainname, or empty for NEGATIVE */
	202	len = qword_get(&mesg, buf, mlen);
	203	if (len < 0) return -EINVAL;
	204
	205	if (len) {
	206	dom = unix_domain_find(buf);
	207	if (dom == NULL)
	208	return -ENOENT;
	209	} else
	210	dom = NULL;
	211
1a9917c2	212	addr.s_addr =
1da177e4	213	htonl((((((b1<<8)\|b2)<<8)\|b3)<<8)\|b4);
1a9917c2 N	214
	215	ipmp = ip_map_lookup(class,addr);
	216	if (ipmp) {
	217	err = ip_map_update(ipmp,
	218	container_of(dom, struct unix_domain, h),
	219	expiry);
1da177e4	220	} else
1a9917c2	221	err = -ENOMEM;
1da177e4	222
1da177e4 LT	223	if (dom)
1da177e4 LT	224	auth_domain_put(dom);
1a9917c2	225
1da177e4	226	cache_flush();
1a9917c2	227	return err;
1da177e4 LT	228	}
	229
	230	static int ip_map_show(struct seq_file *m,
	231	struct cache_detail *cd,
	232	struct cache_head *h)
	233	{
	234	struct ip_map *im;
	235	struct in_addr addr;
	236	char *dom = "-no-domain-";
	237
	238	if (h == NULL) {
	239	seq_puts(m, "#class IP domain\n");
	240	return 0;
	241	}
	242	im = container_of(h, struct ip_map, h);
	243	/* class addr domain */
	244	addr = im->m_addr;
	245
	246	if (test_bit(CACHE_VALID, &h->flags) &&
	247	!test_bit(CACHE_NEGATIVE, &h->flags))
	248	dom = im->m_client->h.name;
	249
	250	seq_printf(m, "%s %d.%d.%d.%d %s\n",
	251	im->m_class,
	252	htonl(addr.s_addr) >> 24 & 0xff,
	253	htonl(addr.s_addr) >> 16 & 0xff,
	254	htonl(addr.s_addr) >> 8 & 0xff,
	255	htonl(addr.s_addr) >> 0 & 0xff,
	256	dom
	257	);
	258	return 0;
	259	}
	260
	261
	262	struct cache_detail ip_map_cache = {
f35279d3	263	.owner = THIS_MODULE,
1da177e4 LT	264	.hash_size = IP_HASHMAX,
	265	.hash_table = ip_table,
	266	.name = "auth.unix.ip",
	267	.cache_put = ip_map_put,
	268	.cache_request = ip_map_request,
	269	.cache_parse = ip_map_parse,
	270	.cache_show = ip_map_show,
1a9917c2 N	271	.match = ip_map_match,
	272	.init = ip_map_init,
	273	.update = update,
	274	.alloc = ip_map_alloc,
1da177e4 LT	275	};
1da177e4 LT	276
1a9917c2 N	277	static struct ip_map ip_map_lookup(char class, struct in_addr addr)
	278	{
	279	struct ip_map ip;
	280	struct cache_head *ch;
	281
	282	strcpy(ip.m_class, class);
	283	ip.m_addr = addr;
	284	ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
	285	hash_str(class, IP_HASHBITS) ^
	286	hash_ip((unsigned long)addr.s_addr));
	287
	288	if (ch)
	289	return container_of(ch, struct ip_map, h);
	290	else
	291	return NULL;
	292	}
1da177e4	293
1a9917c2 N	294	static int ip_map_update(struct ip_map ipm, struct unix_domain udom, time_t expiry)
	295	{
	296	struct ip_map ip;
	297	struct cache_head *ch;
	298
	299	ip.m_client = udom;
	300	ip.h.flags = 0;
	301	if (!udom)
	302	set_bit(CACHE_NEGATIVE, &ip.h.flags);
	303	else {
	304	ip.m_add_change = udom->addr_changes;
	305	/* if this is from the legacy set_client system call,
	306	* we need m_add_change to be one higher
	307	*/
	308	if (expiry == NEVER)
	309	ip.m_add_change++;
	310	}
	311	ip.h.expiry_time = expiry;
	312	ch = sunrpc_cache_update(&ip_map_cache,
	313	&ip.h, &ipm->h,
	314	hash_str(ipm->m_class, IP_HASHBITS) ^
	315	hash_ip((unsigned long)ipm->m_addr.s_addr));
	316	if (!ch)
	317	return -ENOMEM;
baab935f	318	cache_put(ch, &ip_map_cache);
1a9917c2 N	319	return 0;
1a9917c2 N	320	}
1da177e4 LT	321
	322	int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
	323	{
	324	struct unix_domain *udom;
1a9917c2	325	struct ip_map *ipmp;
1da177e4	326
efc36aa5	327	if (dom->flavour != &svcauth_unix)
1da177e4 LT	328	return -EINVAL;
1da177e4 LT	329	udom = container_of(dom, struct unix_domain, h);
1a9917c2	330	ipmp = ip_map_lookup("nfsd", addr);
1da177e4	331
1a9917c2 N	332	if (ipmp)
	333	return ip_map_update(ipmp, udom, NEVER);
	334	else
1da177e4 LT	335	return -ENOMEM;
	336	}
	337
	338	int auth_unix_forget_old(struct auth_domain *dom)
	339	{
	340	struct unix_domain *udom;
	341
efc36aa5	342	if (dom->flavour != &svcauth_unix)
1da177e4 LT	343	return -EINVAL;
	344	udom = container_of(dom, struct unix_domain, h);
	345	udom->addr_changes++;
	346	return 0;
	347	}
	348
	349	struct auth_domain *auth_unix_lookup(struct in_addr addr)
	350	{
	351	struct ip_map key, *ipm;
	352	struct auth_domain *rv;
	353
	354	strcpy(key.m_class, "nfsd");
	355	key.m_addr = addr;
	356
1a9917c2	357	ipm = ip_map_lookup("nfsd", addr);
1da177e4 LT	358
	359	if (!ipm)
	360	return NULL;
	361	if (cache_check(&ip_map_cache, &ipm->h, NULL))
	362	return NULL;
	363
	364	if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
	365	if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
	366	auth_domain_put(&ipm->m_client->h);
	367	rv = NULL;
	368	} else {
	369	rv = &ipm->m_client->h;
efc36aa5	370	kref_get(&rv->ref);
1da177e4	371	}
baab935f	372	cache_put(&ipm->h, &ip_map_cache);
1da177e4 LT	373	return rv;
	374	}
	375
	376	void svcauth_unix_purge(void)
	377	{
	378	cache_purge(&ip_map_cache);
1da177e4 LT	379	}
	380
	381	static int
	382	svcauth_unix_set_client(struct svc_rqst *rqstp)
	383	{
1a9917c2	384	struct ip_map *ipm;
1da177e4 LT	385
	386	rqstp->rq_client = NULL;
	387	if (rqstp->rq_proc == 0)
	388	return SVC_OK;
	389
1a9917c2 N	390	ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
1a9917c2 N	391	rqstp->rq_addr.sin_addr);
1da177e4 LT	392
	393	if (ipm == NULL)
	394	return SVC_DENIED;
	395
	396	switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
	397	default:
	398	BUG();
	399	case -EAGAIN:
	400	return SVC_DROP;
	401	case -ENOENT:
	402	return SVC_DENIED;
	403	case 0:
	404	rqstp->rq_client = &ipm->m_client->h;
efc36aa5	405	kref_get(&rqstp->rq_client->ref);
baab935f	406	cache_put(&ipm->h, &ip_map_cache);
1da177e4 LT	407	break;
	408	}
	409	return SVC_OK;
	410	}
	411
	412	static int
	413	svcauth_null_accept(struct svc_rqst rqstp, u32 authp)
	414	{
	415	struct kvec *argv = &rqstp->rq_arg.head[0];
	416	struct kvec *resv = &rqstp->rq_res.head[0];
	417	struct svc_cred *cred = &rqstp->rq_cred;
	418
	419	cred->cr_group_info = NULL;
	420	rqstp->rq_client = NULL;
	421
	422	if (argv->iov_len < 3*4)
	423	return SVC_GARBAGE;
	424
	425	if (svc_getu32(argv) != 0) {
	426	dprintk("svc: bad null cred\n");
	427	*authp = rpc_autherr_badcred;
	428	return SVC_DENIED;
	429	}
	430	if (svc_getu32(argv) != RPC_AUTH_NULL \|\| svc_getu32(argv) != 0) {
	431	dprintk("svc: bad null verf\n");
	432	*authp = rpc_autherr_badverf;
	433	return SVC_DENIED;
	434	}
	435
	436	/* Signal that mapping to nobody uid/gid is required */
	437	cred->cr_uid = (uid_t) -1;
	438	cred->cr_gid = (gid_t) -1;
	439	cred->cr_group_info = groups_alloc(0);
	440	if (cred->cr_group_info == NULL)
	441	return SVC_DROP; /* kmalloc failure - client must retry */
	442
	443	/* Put NULL verifier */
	444	svc_putu32(resv, RPC_AUTH_NULL);
	445	svc_putu32(resv, 0);
	446
	447	return SVC_OK;
	448	}
	449
	450	static int
	451	svcauth_null_release(struct svc_rqst *rqstp)
	452	{
	453	if (rqstp->rq_client)
	454	auth_domain_put(rqstp->rq_client);
	455	rqstp->rq_client = NULL;
	456	if (rqstp->rq_cred.cr_group_info)
	457	put_group_info(rqstp->rq_cred.cr_group_info);
	458	rqstp->rq_cred.cr_group_info = NULL;
	459
	460	return 0; /* don't drop */
	461	}
	462
	463
	464	struct auth_ops svcauth_null = {
	465	.name = "null",
	466	.owner = THIS_MODULE,
	467	.flavour = RPC_AUTH_NULL,
	468	.accept = svcauth_null_accept,
	469	.release = svcauth_null_release,
	470	.set_client = svcauth_unix_set_client,
471	};
472
473
474	static int
475	svcauth_unix_accept(struct svc_rqst rqstp, u32 authp)
476	{
477	struct kvec *argv = &rqstp->rq_arg.head[0];
478	struct kvec *resv = &rqstp->rq_res.head[0];
479	struct svc_cred *cred = &rqstp->rq_cred;
480	u32 slen, i;
481	int len = argv->iov_len;
482
483	cred->cr_group_info = NULL;
484	rqstp->rq_client = NULL;
485
486	if ((len -= 3*4) < 0)
487	return SVC_GARBAGE;
488
489	svc_getu32(argv); /* length */
490	svc_getu32(argv); /* time stamp */
491	slen = XDR_QUADLEN(ntohl(svc_getu32(argv))); /* machname length */
492	if (slen > 64 \|\| (len -= (slen + 3)*4) < 0)
493	goto badcred;
494	argv->iov_base = (void)((u32)argv->iov_base + slen); /* skip machname */
495	argv->iov_len -= slen*4;
496
497	cred->cr_uid = ntohl(svc_getu32(argv)); /* uid */
498	cred->cr_gid = ntohl(svc_getu32(argv)); /* gid */
499	slen = ntohl(svc_getu32(argv)); /* gids length */
500	if (slen > 16 \|\| (len -= (slen + 2)*4) < 0)
501	goto badcred;
502	cred->cr_group_info = groups_alloc(slen);
503	if (cred->cr_group_info == NULL)
504	return SVC_DROP;
505	for (i = 0; i < slen; i++)
506	GROUP_AT(cred->cr_group_info, i) = ntohl(svc_getu32(argv));
507
508	if (svc_getu32(argv) != RPC_AUTH_NULL \|\| svc_getu32(argv) != 0) {
509	*authp = rpc_autherr_badverf;
510	return SVC_DENIED;
511	}
512
513	/* Put NULL verifier */
514	svc_putu32(resv, RPC_AUTH_NULL);
515	svc_putu32(resv, 0);
516
517	return SVC_OK;
518
519	badcred:
520	*authp = rpc_autherr_badcred;
521	return SVC_DENIED;
522	}
523
524	static int
525	svcauth_unix_release(struct svc_rqst *rqstp)
526	{
527	/* Verifier (such as it is) is already in place.
528	*/
529	if (rqstp->rq_client)
530	auth_domain_put(rqstp->rq_client);
531	rqstp->rq_client = NULL;
532	if (rqstp->rq_cred.cr_group_info)
533	put_group_info(rqstp->rq_cred.cr_group_info);
534	rqstp->rq_cred.cr_group_info = NULL;
535
536	return 0;
537	}
538
539
540	struct auth_ops svcauth_unix = {
541	.name = "unix",
542	.owner = THIS_MODULE,
543	.flavour = RPC_AUTH_UNIX,
544	.accept = svcauth_unix_accept,
545	.release = svcauth_unix_release,
546	.domain_release = svcauth_unix_domain_release,
547	.set_client = svcauth_unix_set_client,
548	};
549