// SPDX-License-Identifier: GPL-2.0-only #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_rcu(struct rcu_head *head) { struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head); struct unix_domain *ud = container_of(dom, struct unix_domain, h); kfree(dom->name); kfree(ud); } static void svcauth_unix_domain_release(struct auth_domain *dom) { call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu); } struct auth_domain *unix_domain_find(char *name) { struct auth_domain *rv; struct unix_domain *new = NULL; rv = auth_domain_find(name); 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; struct rcu_head m_rcu; }; 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_rcu(im, m_rcu); } 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 int ip_map_upcall(struct cache_detail *cd, struct cache_head *h) { return sunrpc_cache_pipe_upcall(cd, h); } 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, time64_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; time64_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_rcu(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, time64_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; } 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; struct rcu_head rcu; }; 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_rcu(ug, rcu); } 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 int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h) { return sunrpc_cache_pipe_upcall_timeout(cd, h); } 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; time64_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(current_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(current_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 = m->file->f_cred->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_upcall = unix_gid_upcall, .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_rcu(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; struct user_namespace *userns; 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. */ userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ? rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns; cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */ cred->cr_gid = make_kgid(userns, 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(userns, 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_upcall = ip_map_upcall, .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); }