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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <linux/completion.h>#include <linux/ip.h>#include <linux/module.h>#include <linux/sched/signal.h>#include <linux/sunrpc/svc.h>#include <linux/sunrpc/svcsock.h>#include <linux/nfs_fs.h>#include <linux/errno.h>#include <linux/mutex.h>#include <linux/freezer.h>#include <linux/sunrpc/svcauth_gss.h>#include <linux/sunrpc/bc_xprt.h>
#include <net/inet_sock.h>
#include "nfs4_fs.h"#include "callback.h"#include "internal.h"#include "netns.h"
#define NFSDBG_FACILITY NFSDBG_CALLBACK
struct nfs_callback_data { unsigned int users; struct svc_serv *serv;};
static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1];static DEFINE_MUTEX(nfs_callback_mutex);static struct svc_program nfs4_callback_program;
static int nfs4_callback_up_net(struct svc_serv *serv, struct net *net){ const struct cred *cred = current_cred(); int ret; struct nfs_net *nn = net_generic(net, nfs_net_id);
ret = svc_xprt_create(serv, "tcp", net, PF_INET, nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS, cred); if (ret <= 0) goto out_err; nn->nfs_callback_tcpport = ret; dprintk("NFS: Callback listener port = %u (af %u, net %x)\n", nn->nfs_callback_tcpport, PF_INET, net->ns.inum);
ret = svc_xprt_create(serv, "tcp", net, PF_INET6, nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS, cred); if (ret > 0) { nn->nfs_callback_tcpport6 = ret; dprintk("NFS: Callback listener port = %u (af %u, net %x)\n", nn->nfs_callback_tcpport6, PF_INET6, net->ns.inum); } else if (ret != -EAFNOSUPPORT) goto out_err; return 0;
out_err: return (ret) ? ret : -ENOMEM;}
/* * This is the NFSv4 callback kernel thread. */static intnfs4_callback_svc(void *vrqstp){ struct svc_rqst *rqstp = vrqstp;
svc_thread_init_status(rqstp, 0);
set_freezable();
while (!svc_thread_should_stop(rqstp)) svc_recv(rqstp, 0);
svc_exit_thread(rqstp); return 0;}
static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt, struct svc_serv *serv){ if (minorversion) /* * Save the svc_serv in the transport so that it can * be referenced when the session backchannel is initialized */ xprt->bc_serv = serv;}
static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt, struct svc_serv *serv){ int nrservs = nfs_callback_nr_threads; int ret;
nfs_callback_bc_serv(minorversion, xprt, serv);
if (nrservs < NFS4_MIN_NR_CALLBACK_THREADS) nrservs = NFS4_MIN_NR_CALLBACK_THREADS;
if (serv->sv_nrthreads == nrservs) return 0;
ret = svc_set_num_threads(serv, 0, nrservs); if (ret) { svc_set_num_threads(serv, 0, 0); return ret; } dprintk("nfs_callback_up: service started\n"); return 0;}
static void nfs_callback_down_net(u32 minorversion, struct svc_serv *serv, struct net *net){ struct nfs_net *nn = net_generic(net, nfs_net_id);
if (--nn->cb_users[minorversion]) return;
dprintk("NFS: destroy per-net callback data; net=%x\n", net->ns.inum); svc_xprt_destroy_all(serv, net, false);}
static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, struct net *net, struct rpc_xprt *xprt){ struct nfs_net *nn = net_generic(net, nfs_net_id); int ret;
if (nn->cb_users[minorversion]++) return 0;
dprintk("NFS: create per-net callback data; net=%x\n", net->ns.inum);
ret = svc_bind(serv, net); if (ret < 0) { printk(KERN_WARNING "NFS: bind callback service failed\n"); goto err; }
ret = 0; if (minorversion == 0) ret = nfs4_callback_up_net(serv, net); else if (xprt->ops->bc_setup) set_bc_enabled(serv); else ret = -EPROTONOSUPPORT;
if (ret < 0) { printk(KERN_ERR "NFS: callback service start failed\n"); goto err; } return 0;
err: nn->cb_users[minorversion]--; dprintk("NFS: Couldn't create callback socket: err = %d; " "net = %x\n", ret, net->ns.inum); return ret;}
static struct svc_serv *nfs_callback_create_svc(int minorversion){ struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; int (*threadfn)(void *data); struct svc_serv *serv;
/* * Check whether we're already up and running. */ if (cb_info->serv) return cb_info->serv;
/* * Sanity check: if there's no task, * we should be the first user ... */ if (cb_info->users) printk(KERN_WARNING "nfs_callback_create_svc: no kthread, %d users??\n", cb_info->users);
threadfn = nfs4_callback_svc; serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, threadfn); if (!serv) { printk(KERN_ERR "nfs_callback_create_svc: create service failed\n"); return ERR_PTR(-ENOMEM); } cb_info->serv = serv; dprintk("nfs_callback_create_svc: service created\n"); return serv;}
/* * Bring up the callback thread if it is not already up. */int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt){ struct svc_serv *serv; struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; int ret; struct net *net = xprt->xprt_net;
mutex_lock(&nfs_callback_mutex);
serv = nfs_callback_create_svc(minorversion); if (IS_ERR(serv)) { ret = PTR_ERR(serv); goto err_create; }
ret = nfs_callback_up_net(minorversion, serv, net, xprt); if (ret < 0) goto err_net;
ret = nfs_callback_start_svc(minorversion, xprt, serv); if (ret < 0) goto err_start;
cb_info->users++;err_net: if (!cb_info->users) { xprt_svc_shutdown_bc(xprt); svc_set_num_threads(cb_info->serv, 0, 0); xprt_svc_destroy_nullify_bc(xprt, &cb_info->serv); }err_create: mutex_unlock(&nfs_callback_mutex); return ret;
err_start: nfs_callback_down_net(minorversion, serv, net); dprintk("NFS: Couldn't create server thread; err = %d\n", ret); goto err_net;}
/* * Kill the callback thread if it's no longer being used. */void nfs_callback_down(int minorversion, struct net *net, struct rpc_xprt *xprt){ struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; struct svc_serv *serv;
mutex_lock(&nfs_callback_mutex); serv = cb_info->serv; xprt_svc_shutdown_bc(xprt); nfs_callback_down_net(minorversion, serv, net); cb_info->users--; if (cb_info->users == 0) { svc_set_num_threads(serv, 0, 0); dprintk("nfs_callback_down: service destroyed\n"); xprt_svc_destroy_nullify_bc(xprt, &cb_info->serv); } mutex_unlock(&nfs_callback_mutex);}
/* Boolean check of RPC_AUTH_GSS principal */intcheck_gss_callback_principal(struct nfs_client *clp, struct svc_rqst *rqstp){ char *p = rqstp->rq_cred.cr_principal;
if (rqstp->rq_authop->flavour != RPC_AUTH_GSS) return 1;
/* No RPC_AUTH_GSS on NFSv4.1 back channel yet */ if (clp->cl_minorversion != 0) return 0; /* * It might just be a normal user principal, in which case * userspace won't bother to tell us the name at all. */ if (p == NULL) return 0;
/* * Did we get the acceptor from userland during the SETCLIENID * negotiation? */ if (clp->cl_acceptor) return !strcmp(p, clp->cl_acceptor);
/* * Otherwise try to verify it using the cl_hostname. Note that this * doesn't work if a non-canonical hostname was used in the devname. */
/* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */
if (memcmp(p, "nfs@", 4) != 0) return 0; p += 4; if (strcmp(p, clp->cl_hostname) != 0) return 0; return 1;}
/* * pg_authenticate method for nfsv4 callback threads. * * The authflavor has been negotiated, so an incorrect flavor is a server * bug. Deny packets with incorrect authflavor. * * All other checking done after NFS decoding where the nfs_client can be * found in nfs4_callback_compound */static enum svc_auth_status nfs_callback_authenticate(struct svc_rqst *rqstp){ rqstp->rq_auth_stat = rpc_autherr_badcred;
switch (rqstp->rq_authop->flavour) { case RPC_AUTH_NULL: if (rqstp->rq_proc != CB_NULL) return SVC_DENIED; break; case RPC_AUTH_GSS: /* No RPC_AUTH_GSS support yet in NFSv4.1 */ if (svc_is_backchannel(rqstp)) return SVC_DENIED; }
rqstp->rq_auth_stat = rpc_auth_ok; return SVC_OK;}
/* * Define NFS4 callback program */static const struct svc_version *nfs4_callback_version[] = { [1] = &nfs4_callback_version1, [4] = &nfs4_callback_version4,};
static struct svc_program nfs4_callback_program = { .pg_prog = NFS4_CALLBACK, /* RPC service number */ .pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */ .pg_vers = nfs4_callback_version, /* version table */ .pg_name = "NFSv4 callback", /* service name */ .pg_class = "nfs", /* authentication class */ .pg_authenticate = nfs_callback_authenticate, .pg_init_request = svc_generic_init_request, .pg_rpcbind_set = svc_generic_rpcbind_set,};