[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>
#include <net/sock.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(__be32 ip)
{
	int hash = (__force u32)ip ^ ((__force u32)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);
	__be32 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,
		   ntohl(addr.s_addr) >> 24 & 0xff,
		   ntohl(addr.s_addr) >> 16 & 0xff,
		   ntohl(addr.s_addr) >>  8 & 0xff,
		   ntohl(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(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(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 *ipm;
	struct auth_domain *rv;

	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 inline struct ip_map *
ip_map_cached_get(struct svc_rqst *rqstp)
{
	struct ip_map *ipm = rqstp->rq_sock->sk_info_authunix;
	if (ipm != NULL) {
		if (!cache_valid(&ipm->h)) {
			/*
			 * The entry has been invalidated since it was
			 * remembered, e.g. by a second mount from the
			 * same IP address.
			 */
			rqstp->rq_sock->sk_info_authunix = NULL;
			cache_put(&ipm->h, &ip_map_cache);
			return NULL;
		}
		cache_get(&ipm->h);
	}
	return ipm;
}

static inline void
ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
{
	struct svc_sock *svsk = rqstp->rq_sock;

	if (svsk->sk_sock->type == SOCK_STREAM && svsk->sk_info_authunix == NULL)
		svsk->sk_info_authunix = ipm;	/* newly cached, keep the reference */
	else
		cache_put(&ipm->h, &ip_map_cache);
}

void
svcauth_unix_info_release(void *info)
{
	struct ip_map *ipm = info;
	cache_put(&ipm->h, &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_cached_get(rqstp);
	if (ipm == NULL)
		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);
			ip_map_cached_put(rqstp, ipm);
			break;
	}
	return SVC_OK;
}

static int
svcauth_null_accept(struct svc_rqst *rqstp, __be32 *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) != htonl(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_putnl(resv, RPC_AUTH_NULL);
	svc_putnl(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, __be32 *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(svc_getnl(argv));	/* machname length */
	if (slen > 64 || (len -= (slen + 3)*4) < 0)
		goto badcred;
	argv->iov_base = (void*)((__be32*)argv->iov_base + slen);	/* skip machname */
	argv->iov_len -= slen*4;

	cred->cr_uid = svc_getnl(argv);		/* uid */
	cred->cr_gid = svc_getnl(argv);		/* gid */
	slen = svc_getnl(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) = svc_getnl(argv);

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

	/* Put NULL verifier */
	svc_putnl(resv, RPC_AUTH_NULL);
	svc_putnl(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>
7b2b1fee	12	#include <net/sock.h>
1da177e4 LT	13
	14	#define RPCDBG_FACILITY RPCDBG_AUTH
	15
	16
	17	/*
	18	* AUTHUNIX and AUTHNULL credentials are both handled here.
	19	* AUTHNULL is treated just like AUTHUNIX except that the uid/gid
	20	* are always nobody (-2). i.e. we do the same IP address checks for
	21	* AUTHNULL as for AUTHUNIX, and that is done here.
	22	*/
	23
	24
1da177e4 LT	25	struct unix_domain {
	26	struct auth_domain h;
	27	int addr_changes;
	28	/* other stuff later */
	29	};
	30
efc36aa5 N	31	extern struct auth_ops svcauth_unix;
efc36aa5 N	32
1da177e4 LT	33	struct auth_domain unix_domain_find(char name)
1da177e4 LT	34	{
efc36aa5 N	35	struct auth_domain *rv;
	36	struct unix_domain *new = NULL;
	37
	38	rv = auth_domain_lookup(name, NULL);
	39	while(1) {
ad1b5229 N	40	if (rv) {
	41	if (new && rv != &new->h)
	42	auth_domain_put(&new->h);
	43
	44	if (rv->flavour != &svcauth_unix) {
	45	auth_domain_put(rv);
	46	return NULL;
	47	}
efc36aa5 N	48	return rv;
efc36aa5 N	49	}
efc36aa5 N	50
	51	new = kmalloc(sizeof(*new), GFP_KERNEL);
	52	if (new == NULL)
	53	return NULL;
	54	kref_init(&new->h.ref);
	55	new->h.name = kstrdup(name, GFP_KERNEL);
	56	new->h.flavour = &svcauth_unix;
	57	new->addr_changes = 0;
	58	rv = auth_domain_lookup(name, &new->h);
1da177e4	59	}
1da177e4 LT	60	}
	61
	62	static void svcauth_unix_domain_release(struct auth_domain *dom)
	63	{
	64	struct unix_domain *ud = container_of(dom, struct unix_domain, h);
	65
	66	kfree(dom->name);
	67	kfree(ud);
	68	}
	69
	70
	71	/**************************************************
	72	* cache for IP address to unix_domain
	73	* as needed by AUTH_UNIX
	74	*/
	75	#define IP_HASHBITS 8
	76	#define IP_HASHMAX (1<<IP_HASHBITS)
	77	#define IP_HASHMASK (IP_HASHMAX-1)
	78
	79	struct ip_map {
	80	struct cache_head h;
	81	char m_class[8]; /* e.g. "nfsd" */
	82	struct in_addr m_addr;
	83	struct unix_domain *m_client;
	84	int m_add_change;
	85	};
	86	static struct cache_head *ip_table[IP_HASHMAX];
	87
baab935f	88	static void ip_map_put(struct kref *kref)
1da177e4	89	{
baab935f	90	struct cache_head *item = container_of(kref, struct cache_head, ref);
1da177e4	91	struct ip_map *im = container_of(item, struct ip_map,h);
baab935f N	92
	93	if (test_bit(CACHE_VALID, &item->flags) &&
	94	!test_bit(CACHE_NEGATIVE, &item->flags))
	95	auth_domain_put(&im->m_client->h);
	96	kfree(im);
1da177e4 LT	97	}
1da177e4 LT	98
1f1e030b N	99	#if IP_HASHBITS == 8
	100	/* hash_long on a 64 bit machine is currently REALLY BAD for
	101	* IP addresses in reverse-endian (i.e. on a little-endian machine).
	102	* So use a trivial but reliable hash instead
	103	*/
4806126d	104	static inline int hash_ip(__be32 ip)
1f1e030b	105	{
4806126d	106	int hash = (__force u32)ip ^ ((__force u32)ip>>16);
1f1e030b N	107	return (hash ^ (hash>>8)) & 0xff;
	108	}
	109	#endif
1a9917c2	110	static int ip_map_match(struct cache_head corig, struct cache_head cnew)
1da177e4	111	{
1a9917c2 N	112	struct ip_map *orig = container_of(corig, struct ip_map, h);
	113	struct ip_map *new = container_of(cnew, struct ip_map, h);
	114	return strcmp(orig->m_class, new->m_class) == 0
	115	&& orig->m_addr.s_addr == new->m_addr.s_addr;
1da177e4	116	}
1a9917c2	117	static void ip_map_init(struct cache_head cnew, struct cache_head citem)
1da177e4	118	{
1a9917c2 N	119	struct ip_map *new = container_of(cnew, struct ip_map, h);
	120	struct ip_map *item = container_of(citem, struct ip_map, h);
	121
1da177e4 LT	122	strcpy(new->m_class, item->m_class);
	123	new->m_addr.s_addr = item->m_addr.s_addr;
	124	}
1a9917c2	125	static void update(struct cache_head cnew, struct cache_head citem)
1da177e4	126	{
1a9917c2 N	127	struct ip_map *new = container_of(cnew, struct ip_map, h);
	128	struct ip_map *item = container_of(citem, struct ip_map, h);
	129
efc36aa5	130	kref_get(&item->m_client->h.ref);
1da177e4 LT	131	new->m_client = item->m_client;
	132	new->m_add_change = item->m_add_change;
	133	}
1a9917c2 N	134	static struct cache_head *ip_map_alloc(void)
	135	{
	136	struct ip_map i = kmalloc(sizeof(i), GFP_KERNEL);
	137	if (i)
	138	return &i->h;
	139	else
	140	return NULL;
	141	}
1da177e4 LT	142
	143	static void ip_map_request(struct cache_detail *cd,
	144	struct cache_head *h,
	145	char *bpp, int blen)
	146	{
	147	char text_addr[20];
	148	struct ip_map *im = container_of(h, struct ip_map, h);
d8ed029d	149	__be32 addr = im->m_addr.s_addr;
1da177e4 LT	150
	151	snprintf(text_addr, 20, "%u.%u.%u.%u",
	152	ntohl(addr) >> 24 & 0xff,
	153	ntohl(addr) >> 16 & 0xff,
	154	ntohl(addr) >> 8 & 0xff,
	155	ntohl(addr) >> 0 & 0xff);
	156
	157	qword_add(bpp, blen, im->m_class);
	158	qword_add(bpp, blen, text_addr);
	159	(*bpp)[-1] = '\n';
	160	}
	161
1a9917c2 N	162	static struct ip_map ip_map_lookup(char class, struct in_addr addr);
1a9917c2 N	163	static int ip_map_update(struct ip_map ipm, struct unix_domain udom, time_t expiry);
1da177e4 LT	164
	165	static int ip_map_parse(struct cache_detail *cd,
	166	char *mesg, int mlen)
	167	{
	168	/* class ipaddress [domainname] */
	169	/* should be safe just to use the start of the input buffer
	170	* for scratch: */
	171	char *buf = mesg;
	172	int len;
	173	int b1,b2,b3,b4;
	174	char c;
1a9917c2 N	175	char class[8];
	176	struct in_addr addr;
	177	int err;
	178
	179	struct ip_map *ipmp;
1da177e4 LT	180	struct auth_domain *dom;
	181	time_t expiry;
	182
	183	if (mesg[mlen-1] != '\n')
	184	return -EINVAL;
	185	mesg[mlen-1] = 0;
	186
	187	/* class */
1a9917c2	188	len = qword_get(&mesg, class, sizeof(class));
1da177e4 LT	189	if (len <= 0) return -EINVAL;
	190
	191	/* ip address */
	192	len = qword_get(&mesg, buf, mlen);
	193	if (len <= 0) return -EINVAL;
	194
	195	if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
	196	return -EINVAL;
	197
	198	expiry = get_expiry(&mesg);
	199	if (expiry ==0)
	200	return -EINVAL;
	201
	202	/* domainname, or empty for NEGATIVE */
	203	len = qword_get(&mesg, buf, mlen);
	204	if (len < 0) return -EINVAL;
	205
	206	if (len) {
	207	dom = unix_domain_find(buf);
	208	if (dom == NULL)
	209	return -ENOENT;
	210	} else
	211	dom = NULL;
	212
1a9917c2	213	addr.s_addr =
1da177e4	214	htonl((((((b1<<8)\|b2)<<8)\|b3)<<8)\|b4);
1a9917c2 N	215
	216	ipmp = ip_map_lookup(class,addr);
	217	if (ipmp) {
	218	err = ip_map_update(ipmp,
	219	container_of(dom, struct unix_domain, h),
	220	expiry);
1da177e4	221	} else
1a9917c2	222	err = -ENOMEM;
1da177e4	223
1da177e4 LT	224	if (dom)
1da177e4 LT	225	auth_domain_put(dom);
1a9917c2	226
1da177e4	227	cache_flush();
1a9917c2	228	return err;
1da177e4 LT	229	}
	230
	231	static int ip_map_show(struct seq_file *m,
	232	struct cache_detail *cd,
	233	struct cache_head *h)
	234	{
	235	struct ip_map *im;
	236	struct in_addr addr;
	237	char *dom = "-no-domain-";
	238
	239	if (h == NULL) {
	240	seq_puts(m, "#class IP domain\n");
	241	return 0;
	242	}
	243	im = container_of(h, struct ip_map, h);
	244	/* class addr domain */
	245	addr = im->m_addr;
	246
	247	if (test_bit(CACHE_VALID, &h->flags) &&
	248	!test_bit(CACHE_NEGATIVE, &h->flags))
	249	dom = im->m_client->h.name;
	250
	251	seq_printf(m, "%s %d.%d.%d.%d %s\n",
	252	im->m_class,
753ed90d AV	253	ntohl(addr.s_addr) >> 24 & 0xff,
	254	ntohl(addr.s_addr) >> 16 & 0xff,
	255	ntohl(addr.s_addr) >> 8 & 0xff,
	256	ntohl(addr.s_addr) >> 0 & 0xff,
1da177e4 LT	257	dom
	258	);
	259	return 0;
	260	}
	261
	262
	263	struct cache_detail ip_map_cache = {
f35279d3	264	.owner = THIS_MODULE,
1da177e4 LT	265	.hash_size = IP_HASHMAX,
	266	.hash_table = ip_table,
	267	.name = "auth.unix.ip",
	268	.cache_put = ip_map_put,
	269	.cache_request = ip_map_request,
	270	.cache_parse = ip_map_parse,
	271	.cache_show = ip_map_show,
1a9917c2 N	272	.match = ip_map_match,
	273	.init = ip_map_init,
	274	.update = update,
	275	.alloc = ip_map_alloc,
1da177e4 LT	276	};
1da177e4 LT	277
1a9917c2 N	278	static struct ip_map ip_map_lookup(char class, struct in_addr addr)
	279	{
	280	struct ip_map ip;
	281	struct cache_head *ch;
	282
	283	strcpy(ip.m_class, class);
	284	ip.m_addr = addr;
	285	ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
	286	hash_str(class, IP_HASHBITS) ^
4806126d	287	hash_ip(addr.s_addr));
1a9917c2 N	288
	289	if (ch)
	290	return container_of(ch, struct ip_map, h);
	291	else
	292	return NULL;
	293	}
1da177e4	294
1a9917c2 N	295	static int ip_map_update(struct ip_map ipm, struct unix_domain udom, time_t expiry)
	296	{
	297	struct ip_map ip;
	298	struct cache_head *ch;
	299
	300	ip.m_client = udom;
	301	ip.h.flags = 0;
	302	if (!udom)
	303	set_bit(CACHE_NEGATIVE, &ip.h.flags);
	304	else {
	305	ip.m_add_change = udom->addr_changes;
	306	/* if this is from the legacy set_client system call,
	307	* we need m_add_change to be one higher
	308	*/
	309	if (expiry == NEVER)
	310	ip.m_add_change++;
	311	}
	312	ip.h.expiry_time = expiry;
	313	ch = sunrpc_cache_update(&ip_map_cache,
	314	&ip.h, &ipm->h,
	315	hash_str(ipm->m_class, IP_HASHBITS) ^
4806126d	316	hash_ip(ipm->m_addr.s_addr));
1a9917c2 N	317	if (!ch)
1a9917c2 N	318	return -ENOMEM;
baab935f	319	cache_put(ch, &ip_map_cache);
1a9917c2 N	320	return 0;
1a9917c2 N	321	}
1da177e4 LT	322
	323	int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
	324	{
	325	struct unix_domain *udom;
1a9917c2	326	struct ip_map *ipmp;
1da177e4	327
efc36aa5	328	if (dom->flavour != &svcauth_unix)
1da177e4 LT	329	return -EINVAL;
1da177e4 LT	330	udom = container_of(dom, struct unix_domain, h);
1a9917c2	331	ipmp = ip_map_lookup("nfsd", addr);
1da177e4	332
1a9917c2 N	333	if (ipmp)
	334	return ip_map_update(ipmp, udom, NEVER);
	335	else
1da177e4 LT	336	return -ENOMEM;
	337	}
	338
	339	int auth_unix_forget_old(struct auth_domain *dom)
	340	{
	341	struct unix_domain *udom;
	342
efc36aa5	343	if (dom->flavour != &svcauth_unix)
1da177e4 LT	344	return -EINVAL;
	345	udom = container_of(dom, struct unix_domain, h);
	346	udom->addr_changes++;
	347	return 0;
	348	}
	349
	350	struct auth_domain *auth_unix_lookup(struct in_addr addr)
	351	{
40f10522	352	struct ip_map *ipm;
1da177e4 LT	353	struct auth_domain *rv;
1da177e4 LT	354
1a9917c2	355	ipm = ip_map_lookup("nfsd", addr);
1da177e4 LT	356
	357	if (!ipm)
	358	return NULL;
	359	if (cache_check(&ip_map_cache, &ipm->h, NULL))
	360	return NULL;
	361
	362	if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
	363	if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
	364	auth_domain_put(&ipm->m_client->h);
	365	rv = NULL;
	366	} else {
	367	rv = &ipm->m_client->h;
efc36aa5	368	kref_get(&rv->ref);
1da177e4	369	}
baab935f	370	cache_put(&ipm->h, &ip_map_cache);
1da177e4 LT	371	return rv;
	372	}
	373
	374	void svcauth_unix_purge(void)
	375	{
	376	cache_purge(&ip_map_cache);
1da177e4 LT	377	}
1da177e4 LT	378
7b2b1fee GB	379	static inline struct ip_map *
	380	ip_map_cached_get(struct svc_rqst *rqstp)
	381	{
	382	struct ip_map *ipm = rqstp->rq_sock->sk_info_authunix;
	383	if (ipm != NULL) {
	384	if (!cache_valid(&ipm->h)) {
	385	/*
	386	* The entry has been invalidated since it was
	387	* remembered, e.g. by a second mount from the
	388	* same IP address.
	389	*/
	390	rqstp->rq_sock->sk_info_authunix = NULL;
	391	cache_put(&ipm->h, &ip_map_cache);
	392	return NULL;
	393	}
	394	cache_get(&ipm->h);
	395	}
	396	return ipm;
	397	}
	398
	399	static inline void
	400	ip_map_cached_put(struct svc_rqst rqstp, struct ip_map ipm)
	401	{
	402	struct svc_sock *svsk = rqstp->rq_sock;
	403
	404	if (svsk->sk_sock->type == SOCK_STREAM && svsk->sk_info_authunix == NULL)
	405	svsk->sk_info_authunix = ipm; /* newly cached, keep the reference */
	406	else
	407	cache_put(&ipm->h, &ip_map_cache);
	408	}
	409
	410	void
	411	svcauth_unix_info_release(void *info)
	412	{
	413	struct ip_map *ipm = info;
	414	cache_put(&ipm->h, &ip_map_cache);
	415	}
	416
1da177e4 LT	417	static int
	418	svcauth_unix_set_client(struct svc_rqst *rqstp)
	419	{
1a9917c2	420	struct ip_map *ipm;
1da177e4 LT	421
	422	rqstp->rq_client = NULL;
	423	if (rqstp->rq_proc == 0)
	424	return SVC_OK;
	425
7b2b1fee GB	426	ipm = ip_map_cached_get(rqstp);
	427	if (ipm == NULL)
	428	ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
	429	rqstp->rq_addr.sin_addr);
1da177e4 LT	430
	431	if (ipm == NULL)
	432	return SVC_DENIED;
	433
	434	switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
	435	default:
	436	BUG();
	437	case -EAGAIN:
	438	return SVC_DROP;
	439	case -ENOENT:
	440	return SVC_DENIED;
	441	case 0:
	442	rqstp->rq_client = &ipm->m_client->h;
efc36aa5	443	kref_get(&rqstp->rq_client->ref);
7b2b1fee	444	ip_map_cached_put(rqstp, ipm);
1da177e4 LT	445	break;
	446	}
	447	return SVC_OK;
	448	}
	449
	450	static int
d8ed029d	451	svcauth_null_accept(struct svc_rqst rqstp, __be32 authp)
1da177e4 LT	452	{
	453	struct kvec *argv = &rqstp->rq_arg.head[0];
	454	struct kvec *resv = &rqstp->rq_res.head[0];
	455	struct svc_cred *cred = &rqstp->rq_cred;
	456
	457	cred->cr_group_info = NULL;
	458	rqstp->rq_client = NULL;
	459
	460	if (argv->iov_len < 3*4)
	461	return SVC_GARBAGE;
	462
	463	if (svc_getu32(argv) != 0) {
	464	dprintk("svc: bad null cred\n");
	465	*authp = rpc_autherr_badcred;
	466	return SVC_DENIED;
	467	}
76994313	468	if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) \|\| svc_getu32(argv) != 0) {
1da177e4 LT	469	dprintk("svc: bad null verf\n");
	470	*authp = rpc_autherr_badverf;
	471	return SVC_DENIED;
	472	}
	473
	474	/* Signal that mapping to nobody uid/gid is required */
	475	cred->cr_uid = (uid_t) -1;
	476	cred->cr_gid = (gid_t) -1;
	477	cred->cr_group_info = groups_alloc(0);
	478	if (cred->cr_group_info == NULL)
	479	return SVC_DROP; /* kmalloc failure - client must retry */
	480
	481	/* Put NULL verifier */
76994313 AD	482	svc_putnl(resv, RPC_AUTH_NULL);
76994313 AD	483	svc_putnl(resv, 0);
1da177e4 LT	484
	485	return SVC_OK;
	486	}
	487
	488	static int
	489	svcauth_null_release(struct svc_rqst *rqstp)
	490	{
	491	if (rqstp->rq_client)
	492	auth_domain_put(rqstp->rq_client);
	493	rqstp->rq_client = NULL;
	494	if (rqstp->rq_cred.cr_group_info)
	495	put_group_info(rqstp->rq_cred.cr_group_info);
	496	rqstp->rq_cred.cr_group_info = NULL;
	497
	498	return 0; /* don't drop */
	499	}
	500
	501
	502	struct auth_ops svcauth_null = {
	503	.name = "null",
	504	.owner = THIS_MODULE,
	505	.flavour = RPC_AUTH_NULL,
	506	.accept = svcauth_null_accept,
	507	.release = svcauth_null_release,
	508	.set_client = svcauth_unix_set_client,
	509	};
	510
	511
	512	static int
d8ed029d	513	svcauth_unix_accept(struct svc_rqst rqstp, __be32 authp)
1da177e4 LT	514	{
	515	struct kvec *argv = &rqstp->rq_arg.head[0];
	516	struct kvec *resv = &rqstp->rq_res.head[0];
	517	struct svc_cred *cred = &rqstp->rq_cred;
	518	u32 slen, i;
	519	int len = argv->iov_len;
	520
	521	cred->cr_group_info = NULL;
	522	rqstp->rq_client = NULL;
	523
	524	if ((len -= 3*4) < 0)
	525	return SVC_GARBAGE;
	526
	527	svc_getu32(argv); /* length */
	528	svc_getu32(argv); /* time stamp */
76994313	529	slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
1da177e4 LT	530	if (slen > 64 \|\| (len -= (slen + 3)*4) < 0)
1da177e4 LT	531	goto badcred;
d8ed029d	532	argv->iov_base = (void)((__be32)argv->iov_base + slen); /* skip machname */
1da177e4 LT	533	argv->iov_len -= slen*4;
1da177e4 LT	534
76994313 AD	535	cred->cr_uid = svc_getnl(argv); /* uid */
	536	cred->cr_gid = svc_getnl(argv); /* gid */
	537	slen = svc_getnl(argv); /* gids length */
1da177e4 LT	538	if (slen > 16 \|\| (len -= (slen + 2)*4) < 0)
	539	goto badcred;
	540	cred->cr_group_info = groups_alloc(slen);
	541	if (cred->cr_group_info == NULL)
	542	return SVC_DROP;
	543	for (i = 0; i < slen; i++)
76994313	544	GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
1da177e4	545
76994313	546	if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) \|\| svc_getu32(argv) != 0) {
1da177e4 LT	547	*authp = rpc_autherr_badverf;
	548	return SVC_DENIED;
	549	}
	550
	551	/* Put NULL verifier */
76994313 AD	552	svc_putnl(resv, RPC_AUTH_NULL);
76994313 AD	553	svc_putnl(resv, 0);
1da177e4 LT	554
	555	return SVC_OK;
	556
	557	badcred:
	558	*authp = rpc_autherr_badcred;
	559	return SVC_DENIED;
	560	}
	561
	562	static int
	563	svcauth_unix_release(struct svc_rqst *rqstp)
	564	{
	565	/* Verifier (such as it is) is already in place.
	566	*/
	567	if (rqstp->rq_client)
	568	auth_domain_put(rqstp->rq_client);
	569	rqstp->rq_client = NULL;
	570	if (rqstp->rq_cred.cr_group_info)
	571	put_group_info(rqstp->rq_cred.cr_group_info);
	572	rqstp->rq_cred.cr_group_info = NULL;
	573
	574	return 0;
	575	}
	576
	577
	578	struct auth_ops svcauth_unix = {
	579	.name = "unix",
	580	.owner = THIS_MODULE,
	581	.flavour = RPC_AUTH_UNIX,
	582	.accept = svcauth_unix_accept,
	583	.release = svcauth_unix_release,
	584	.domain_release = svcauth_unix_domain_release,
	585	.set_client = svcauth_unix_set_client,
	586	};
	587