Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 502 insertions, 0 deletions

diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
new file mode 100644
index 0000000..2b99b40
--- /dev/null
+++ b/net/sunrpc/svcauth_unix.c
@@ -0,0 +1,502 @@
+#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>
+
+#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.
+ */
+
+
+static char *strdup(char *s)
+{
+	char *rv = kmalloc(strlen(s)+1, GFP_KERNEL);
+	if (rv)
+		strcpy(rv, s);
+	return rv;
+}
+
+struct unix_domain {
+	struct auth_domain	h;
+	int	addr_changes;
+	/* other stuff later */
+};
+
+struct auth_domain *unix_domain_find(char *name)
+{
+	struct auth_domain *rv, ud;
+	struct unix_domain *new;
+
+	ud.name = name;
+	
+	rv = auth_domain_lookup(&ud, 0);
+
+ foundit:
+	if (rv && rv->flavour != RPC_AUTH_UNIX) {
+		auth_domain_put(rv);
+		return NULL;
+	}
+	if (rv)
+		return rv;
+
+	new = kmalloc(sizeof(*new), GFP_KERNEL);
+	if (new == NULL)
+		return NULL;
+	cache_init(&new->h.h);
+	new->h.name = strdup(name);
+	new->h.flavour = RPC_AUTH_UNIX;
+	new->addr_changes = 0;
+	new->h.h.expiry_time = NEVER;
+
+	rv = auth_domain_lookup(&new->h, 2);
+	if (rv == &new->h) {
+		if (atomic_dec_and_test(&new->h.h.refcnt)) BUG();
+	} else {
+		auth_domain_put(&new->h);
+		goto foundit;
+	}
+
+	return rv;
+}
+
+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 cache_head *item, struct cache_detail *cd)
+{
+	struct ip_map *im = container_of(item, struct ip_map,h);
+	if (cache_put(item, cd)) {
+		if (test_bit(CACHE_VALID, &item->flags) &&
+		    !test_bit(CACHE_NEGATIVE, &item->flags))
+			auth_domain_put(&im->m_client->h);
+		kfree(im);
+	}
+}
+
+static inline int ip_map_hash(struct ip_map *item)
+{
+	return hash_str(item->m_class, IP_HASHBITS) ^ 
+		hash_long((unsigned long)item->m_addr.s_addr, IP_HASHBITS);
+}
+static inline int ip_map_match(struct ip_map *item, struct ip_map *tmp)
+{
+	return strcmp(tmp->m_class, item->m_class) == 0
+		&& tmp->m_addr.s_addr == item->m_addr.s_addr;
+}
+static inline void ip_map_init(struct ip_map *new, struct ip_map *item)
+{
+	strcpy(new->m_class, item->m_class);
+	new->m_addr.s_addr = item->m_addr.s_addr;
+}
+static inline void ip_map_update(struct ip_map *new, struct ip_map *item)
+{
+	cache_get(&item->m_client->h.h);
+	new->m_client = item->m_client;
+	new->m_add_change = item->m_add_change;
+}
+
+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(struct ip_map *, int);
+
+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;
+	struct ip_map ipm, *ipmp;
+	struct auth_domain *dom;
+	time_t expiry;
+
+	if (mesg[mlen-1] != '\n')
+		return -EINVAL;
+	mesg[mlen-1] = 0;
+
+	/* class */
+	len = qword_get(&mesg, ipm.m_class, sizeof(ipm.m_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;
+
+	ipm.m_addr.s_addr =
+		htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
+	ipm.h.flags = 0;
+	if (dom) {
+		ipm.m_client = container_of(dom, struct unix_domain, h);
+		ipm.m_add_change = ipm.m_client->addr_changes;
+	} else
+		set_bit(CACHE_NEGATIVE, &ipm.h.flags);
+	ipm.h.expiry_time = expiry;
+
+	ipmp = ip_map_lookup(&ipm, 1);
+	if (ipmp)
+		ip_map_put(&ipmp->h, &ip_map_cache);
+	if (dom)
+		auth_domain_put(dom);
+	if (!ipmp)
+		return -ENOMEM;
+	cache_flush();
+	return 0;
+}
+
+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 = {
+	.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,
+};
+
+static DefineSimpleCacheLookup(ip_map, 0)
+
+
+int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
+{
+	struct unix_domain *udom;
+	struct ip_map ip, *ipmp;
+
+	if (dom->flavour != RPC_AUTH_UNIX)
+		return -EINVAL;
+	udom = container_of(dom, struct unix_domain, h);
+	strcpy(ip.m_class, "nfsd");
+	ip.m_addr = addr;
+	ip.m_client = udom;
+	ip.m_add_change = udom->addr_changes+1;
+	ip.h.flags = 0;
+	ip.h.expiry_time = NEVER;
+	
+	ipmp = ip_map_lookup(&ip, 1);
+
+	if (ipmp) {
+		ip_map_put(&ipmp->h, &ip_map_cache);
+		return 0;
+	} else
+		return -ENOMEM;
+}
+
+int auth_unix_forget_old(struct auth_domain *dom)
+{
+	struct unix_domain *udom;
+	
+	if (dom->flavour != RPC_AUTH_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(&key, 0);
+
+	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;
+		cache_get(&rv->h);
+	}
+	ip_map_put(&ipm->h, &ip_map_cache);
+	return rv;
+}
+
+void svcauth_unix_purge(void)
+{
+	cache_purge(&ip_map_cache);
+	cache_purge(&auth_domain_cache);
+}
+
+static int
+svcauth_unix_set_client(struct svc_rqst *rqstp)
+{
+	struct ip_map key, *ipm;
+
+	rqstp->rq_client = NULL;
+	if (rqstp->rq_proc == 0)
+		return SVC_OK;
+
+	strcpy(key.m_class, rqstp->rq_server->sv_program->pg_class);
+	key.m_addr = rqstp->rq_addr.sin_addr;
+
+	ipm = ip_map_lookup(&key, 0);
+
+	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;
+			cache_get(&rqstp->rq_client->h);
+			ip_map_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,
+};
+