v4.19.13 snapshot.
diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
new file mode 100644
index 0000000..af7f28f
--- /dev/null
+++ b/net/sunrpc/svcauth_unix.c
@@ -0,0 +1,908 @@
+#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/sunrpc/gss_api.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/err.h>
+#include <linux/seq_file.h>
+#include <linux/hash.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/ipv6.h>
+#include <linux/kernel.h>
+#include <linux/user_namespace.h>
+#define RPCDBG_FACILITY RPCDBG_AUTH
+
+
+#include "netns.h"
+
+/*
+ * 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;
+ /* other stuff later */
+};
+
+extern struct auth_ops svcauth_null;
+extern struct auth_ops svcauth_unix;
+
+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);
+}
+
+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)
+ svcauth_unix_domain_release(&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);
+ if (new->h.name == NULL) {
+ kfree(new);
+ return NULL;
+ }
+ new->h.flavour = &svcauth_unix;
+ rv = auth_domain_lookup(name, &new->h);
+ }
+}
+EXPORT_SYMBOL_GPL(unix_domain_find);
+
+
+/**************************************************
+ * cache for IP address to unix_domain
+ * as needed by AUTH_UNIX
+ */
+#define IP_HASHBITS 8
+#define IP_HASHMAX (1<<IP_HASHBITS)
+
+struct ip_map {
+ struct cache_head h;
+ char m_class[8]; /* e.g. "nfsd" */
+ struct in6_addr m_addr;
+ struct unix_domain *m_client;
+};
+
+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);
+}
+
+static inline int hash_ip6(const struct in6_addr *ip)
+{
+ return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
+}
+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 &&
+ ipv6_addr_equal(&orig->m_addr, &new->m_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 = item->m_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;
+}
+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[40];
+ struct ip_map *im = container_of(h, struct ip_map, h);
+
+ if (ipv6_addr_v4mapped(&(im->m_addr))) {
+ snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
+ } else {
+ snprintf(text_addr, 40, "%pI6", &im->m_addr);
+ }
+ qword_add(bpp, blen, im->m_class);
+ qword_add(bpp, blen, text_addr);
+ (*bpp)[-1] = '\n';
+}
+
+static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
+static int __ip_map_update(struct cache_detail *cd, 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;
+ char class[8];
+ union {
+ struct sockaddr sa;
+ struct sockaddr_in s4;
+ struct sockaddr_in6 s6;
+ } address;
+ struct sockaddr_in6 sin6;
+ 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 (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
+ return -EINVAL;
+ switch (address.sa.sa_family) {
+ case AF_INET:
+ /* Form a mapped IPv4 address in sin6 */
+ sin6.sin6_family = AF_INET6;
+ ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
+ &sin6.sin6_addr);
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case AF_INET6:
+ memcpy(&sin6, &address.s6, sizeof(sin6));
+ break;
+#endif
+ default:
+ 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;
+
+ /* IPv6 scope IDs are ignored for now */
+ ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
+ if (ipmp) {
+ err = __ip_map_update(cd, 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 in6_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;
+
+ if (ipv6_addr_v4mapped(&addr)) {
+ seq_printf(m, "%s %pI4 %s\n",
+ im->m_class, &addr.s6_addr32[3], dom);
+ } else {
+ seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
+ }
+ return 0;
+}
+
+
+static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
+ struct in6_addr *addr)
+{
+ struct ip_map ip;
+ struct cache_head *ch;
+
+ strcpy(ip.m_class, class);
+ ip.m_addr = *addr;
+ ch = sunrpc_cache_lookup(cd, &ip.h,
+ hash_str(class, IP_HASHBITS) ^
+ hash_ip6(addr));
+
+ if (ch)
+ return container_of(ch, struct ip_map, h);
+ else
+ return NULL;
+}
+
+static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
+ struct in6_addr *addr)
+{
+ struct sunrpc_net *sn;
+
+ sn = net_generic(net, sunrpc_net_id);
+ return __ip_map_lookup(sn->ip_map_cache, class, addr);
+}
+
+static int __ip_map_update(struct cache_detail *cd, 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);
+ ip.h.expiry_time = expiry;
+ ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
+ hash_str(ipm->m_class, IP_HASHBITS) ^
+ hash_ip6(&ipm->m_addr));
+ if (!ch)
+ return -ENOMEM;
+ cache_put(ch, cd);
+ return 0;
+}
+
+static inline int ip_map_update(struct net *net, struct ip_map *ipm,
+ struct unix_domain *udom, time_t expiry)
+{
+ struct sunrpc_net *sn;
+
+ sn = net_generic(net, sunrpc_net_id);
+ return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
+}
+
+void svcauth_unix_purge(struct net *net)
+{
+ struct sunrpc_net *sn;
+
+ sn = net_generic(net, sunrpc_net_id);
+ cache_purge(sn->ip_map_cache);
+}
+EXPORT_SYMBOL_GPL(svcauth_unix_purge);
+
+static inline struct ip_map *
+ip_map_cached_get(struct svc_xprt *xprt)
+{
+ struct ip_map *ipm = NULL;
+ struct sunrpc_net *sn;
+
+ if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
+ spin_lock(&xprt->xpt_lock);
+ ipm = xprt->xpt_auth_cache;
+ if (ipm != NULL) {
+ sn = net_generic(xprt->xpt_net, sunrpc_net_id);
+ if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
+ /*
+ * The entry has been invalidated since it was
+ * remembered, e.g. by a second mount from the
+ * same IP address.
+ */
+ xprt->xpt_auth_cache = NULL;
+ spin_unlock(&xprt->xpt_lock);
+ cache_put(&ipm->h, sn->ip_map_cache);
+ return NULL;
+ }
+ cache_get(&ipm->h);
+ }
+ spin_unlock(&xprt->xpt_lock);
+ }
+ return ipm;
+}
+
+static inline void
+ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
+{
+ if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
+ spin_lock(&xprt->xpt_lock);
+ if (xprt->xpt_auth_cache == NULL) {
+ /* newly cached, keep the reference */
+ xprt->xpt_auth_cache = ipm;
+ ipm = NULL;
+ }
+ spin_unlock(&xprt->xpt_lock);
+ }
+ if (ipm) {
+ struct sunrpc_net *sn;
+
+ sn = net_generic(xprt->xpt_net, sunrpc_net_id);
+ cache_put(&ipm->h, sn->ip_map_cache);
+ }
+}
+
+void
+svcauth_unix_info_release(struct svc_xprt *xpt)
+{
+ struct ip_map *ipm;
+
+ ipm = xpt->xpt_auth_cache;
+ if (ipm != NULL) {
+ struct sunrpc_net *sn;
+
+ sn = net_generic(xpt->xpt_net, sunrpc_net_id);
+ cache_put(&ipm->h, sn->ip_map_cache);
+ }
+}
+
+/****************************************************************************
+ * auth.unix.gid cache
+ * simple cache to map a UID to a list of GIDs
+ * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
+ */
+#define GID_HASHBITS 8
+#define GID_HASHMAX (1<<GID_HASHBITS)
+
+struct unix_gid {
+ struct cache_head h;
+ kuid_t uid;
+ struct group_info *gi;
+};
+
+static int unix_gid_hash(kuid_t uid)
+{
+ return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
+}
+
+static void unix_gid_put(struct kref *kref)
+{
+ struct cache_head *item = container_of(kref, struct cache_head, ref);
+ struct unix_gid *ug = container_of(item, struct unix_gid, h);
+ if (test_bit(CACHE_VALID, &item->flags) &&
+ !test_bit(CACHE_NEGATIVE, &item->flags))
+ put_group_info(ug->gi);
+ kfree(ug);
+}
+
+static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
+{
+ struct unix_gid *orig = container_of(corig, struct unix_gid, h);
+ struct unix_gid *new = container_of(cnew, struct unix_gid, h);
+ return uid_eq(orig->uid, new->uid);
+}
+static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
+{
+ struct unix_gid *new = container_of(cnew, struct unix_gid, h);
+ struct unix_gid *item = container_of(citem, struct unix_gid, h);
+ new->uid = item->uid;
+}
+static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
+{
+ struct unix_gid *new = container_of(cnew, struct unix_gid, h);
+ struct unix_gid *item = container_of(citem, struct unix_gid, h);
+
+ get_group_info(item->gi);
+ new->gi = item->gi;
+}
+static struct cache_head *unix_gid_alloc(void)
+{
+ struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
+ if (g)
+ return &g->h;
+ else
+ return NULL;
+}
+
+static void unix_gid_request(struct cache_detail *cd,
+ struct cache_head *h,
+ char **bpp, int *blen)
+{
+ char tuid[20];
+ struct unix_gid *ug = container_of(h, struct unix_gid, h);
+
+ snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
+ qword_add(bpp, blen, tuid);
+ (*bpp)[-1] = '\n';
+}
+
+static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
+
+static int unix_gid_parse(struct cache_detail *cd,
+ char *mesg, int mlen)
+{
+ /* uid expiry Ngid gid0 gid1 ... gidN-1 */
+ int id;
+ kuid_t uid;
+ int gids;
+ int rv;
+ int i;
+ int err;
+ time_t expiry;
+ struct unix_gid ug, *ugp;
+
+ if (mesg[mlen - 1] != '\n')
+ return -EINVAL;
+ mesg[mlen-1] = 0;
+
+ rv = get_int(&mesg, &id);
+ if (rv)
+ return -EINVAL;
+ uid = make_kuid(&init_user_ns, id);
+ ug.uid = uid;
+
+ expiry = get_expiry(&mesg);
+ if (expiry == 0)
+ return -EINVAL;
+
+ rv = get_int(&mesg, &gids);
+ if (rv || gids < 0 || gids > 8192)
+ return -EINVAL;
+
+ ug.gi = groups_alloc(gids);
+ if (!ug.gi)
+ return -ENOMEM;
+
+ for (i = 0 ; i < gids ; i++) {
+ int gid;
+ kgid_t kgid;
+ rv = get_int(&mesg, &gid);
+ err = -EINVAL;
+ if (rv)
+ goto out;
+ kgid = make_kgid(&init_user_ns, gid);
+ if (!gid_valid(kgid))
+ goto out;
+ ug.gi->gid[i] = kgid;
+ }
+
+ groups_sort(ug.gi);
+ ugp = unix_gid_lookup(cd, uid);
+ if (ugp) {
+ struct cache_head *ch;
+ ug.h.flags = 0;
+ ug.h.expiry_time = expiry;
+ ch = sunrpc_cache_update(cd,
+ &ug.h, &ugp->h,
+ unix_gid_hash(uid));
+ if (!ch)
+ err = -ENOMEM;
+ else {
+ err = 0;
+ cache_put(ch, cd);
+ }
+ } else
+ err = -ENOMEM;
+ out:
+ if (ug.gi)
+ put_group_info(ug.gi);
+ return err;
+}
+
+static int unix_gid_show(struct seq_file *m,
+ struct cache_detail *cd,
+ struct cache_head *h)
+{
+ struct user_namespace *user_ns = &init_user_ns;
+ struct unix_gid *ug;
+ int i;
+ int glen;
+
+ if (h == NULL) {
+ seq_puts(m, "#uid cnt: gids...\n");
+ return 0;
+ }
+ ug = container_of(h, struct unix_gid, h);
+ if (test_bit(CACHE_VALID, &h->flags) &&
+ !test_bit(CACHE_NEGATIVE, &h->flags))
+ glen = ug->gi->ngroups;
+ else
+ glen = 0;
+
+ seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
+ for (i = 0; i < glen; i++)
+ seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
+ seq_printf(m, "\n");
+ return 0;
+}
+
+static const struct cache_detail unix_gid_cache_template = {
+ .owner = THIS_MODULE,
+ .hash_size = GID_HASHMAX,
+ .name = "auth.unix.gid",
+ .cache_put = unix_gid_put,
+ .cache_request = unix_gid_request,
+ .cache_parse = unix_gid_parse,
+ .cache_show = unix_gid_show,
+ .match = unix_gid_match,
+ .init = unix_gid_init,
+ .update = unix_gid_update,
+ .alloc = unix_gid_alloc,
+};
+
+int unix_gid_cache_create(struct net *net)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ struct cache_detail *cd;
+ int err;
+
+ cd = cache_create_net(&unix_gid_cache_template, net);
+ if (IS_ERR(cd))
+ return PTR_ERR(cd);
+ err = cache_register_net(cd, net);
+ if (err) {
+ cache_destroy_net(cd, net);
+ return err;
+ }
+ sn->unix_gid_cache = cd;
+ return 0;
+}
+
+void unix_gid_cache_destroy(struct net *net)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ struct cache_detail *cd = sn->unix_gid_cache;
+
+ sn->unix_gid_cache = NULL;
+ cache_purge(cd);
+ cache_unregister_net(cd, net);
+ cache_destroy_net(cd, net);
+}
+
+static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
+{
+ struct unix_gid ug;
+ struct cache_head *ch;
+
+ ug.uid = uid;
+ ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
+ if (ch)
+ return container_of(ch, struct unix_gid, h);
+ else
+ return NULL;
+}
+
+static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
+{
+ struct unix_gid *ug;
+ struct group_info *gi;
+ int ret;
+ struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
+ sunrpc_net_id);
+
+ ug = unix_gid_lookup(sn->unix_gid_cache, uid);
+ if (!ug)
+ return ERR_PTR(-EAGAIN);
+ ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
+ switch (ret) {
+ case -ENOENT:
+ return ERR_PTR(-ENOENT);
+ case -ETIMEDOUT:
+ return ERR_PTR(-ESHUTDOWN);
+ case 0:
+ gi = get_group_info(ug->gi);
+ cache_put(&ug->h, sn->unix_gid_cache);
+ return gi;
+ default:
+ return ERR_PTR(-EAGAIN);
+ }
+}
+
+int
+svcauth_unix_set_client(struct svc_rqst *rqstp)
+{
+ struct sockaddr_in *sin;
+ struct sockaddr_in6 *sin6, sin6_storage;
+ struct ip_map *ipm;
+ struct group_info *gi;
+ struct svc_cred *cred = &rqstp->rq_cred;
+ struct svc_xprt *xprt = rqstp->rq_xprt;
+ struct net *net = xprt->xpt_net;
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+ switch (rqstp->rq_addr.ss_family) {
+ case AF_INET:
+ sin = svc_addr_in(rqstp);
+ sin6 = &sin6_storage;
+ ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
+ break;
+ case AF_INET6:
+ sin6 = svc_addr_in6(rqstp);
+ break;
+ default:
+ BUG();
+ }
+
+ rqstp->rq_client = NULL;
+ if (rqstp->rq_proc == 0)
+ return SVC_OK;
+
+ ipm = ip_map_cached_get(xprt);
+ if (ipm == NULL)
+ ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
+ &sin6->sin6_addr);
+
+ if (ipm == NULL)
+ return SVC_DENIED;
+
+ switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
+ default:
+ BUG();
+ case -ETIMEDOUT:
+ return SVC_CLOSE;
+ 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(xprt, ipm);
+ break;
+ }
+
+ gi = unix_gid_find(cred->cr_uid, rqstp);
+ switch (PTR_ERR(gi)) {
+ case -EAGAIN:
+ return SVC_DROP;
+ case -ESHUTDOWN:
+ return SVC_CLOSE;
+ case -ENOENT:
+ break;
+ default:
+ put_group_info(cred->cr_group_info);
+ cred->cr_group_info = gi;
+ }
+ return SVC_OK;
+}
+
+EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
+
+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;
+
+ 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 = INVALID_UID;
+ cred->cr_gid = INVALID_GID;
+ cred->cr_group_info = groups_alloc(0);
+ if (cred->cr_group_info == NULL)
+ return SVC_CLOSE; /* kmalloc failure - client must retry */
+
+ /* Put NULL verifier */
+ svc_putnl(resv, RPC_AUTH_NULL);
+ svc_putnl(resv, 0);
+
+ rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
+ 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;
+
+ 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;
+ /*
+ * Note: we skip uid_valid()/gid_valid() checks here for
+ * backwards compatibility with clients that use -1 id's.
+ * Instead, -1 uid or gid is later mapped to the
+ * (export-specific) anonymous id by nfsd_setuser.
+ * Supplementary gid's will be left alone.
+ */
+ cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */
+ cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */
+ slen = svc_getnl(argv); /* gids length */
+ if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
+ goto badcred;
+ cred->cr_group_info = groups_alloc(slen);
+ if (cred->cr_group_info == NULL)
+ return SVC_CLOSE;
+ for (i = 0; i < slen; i++) {
+ kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
+ cred->cr_group_info->gid[i] = kgid;
+ }
+ groups_sort(cred->cr_group_info);
+ 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);
+
+ rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
+ 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,
+};
+
+static const struct cache_detail ip_map_cache_template = {
+ .owner = THIS_MODULE,
+ .hash_size = IP_HASHMAX,
+ .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,
+};
+
+int ip_map_cache_create(struct net *net)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ struct cache_detail *cd;
+ int err;
+
+ cd = cache_create_net(&ip_map_cache_template, net);
+ if (IS_ERR(cd))
+ return PTR_ERR(cd);
+ err = cache_register_net(cd, net);
+ if (err) {
+ cache_destroy_net(cd, net);
+ return err;
+ }
+ sn->ip_map_cache = cd;
+ return 0;
+}
+
+void ip_map_cache_destroy(struct net *net)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ struct cache_detail *cd = sn->ip_map_cache;
+
+ sn->ip_map_cache = NULL;
+ cache_purge(cd);
+ cache_unregister_net(cd, net);
+ cache_destroy_net(cd, net);
+}