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| 1 | /* | |||
| 2 | * linux/fs/nfs/callback.c | |||
| 3 | * | |||
| 4 | * Copyright (C) 2004 Trond Myklebust | |||
| 5 | * | |||
| 6 | * NFSv4 callback handling | |||
| 7 | */ | |||
| 8 | ||||
| 9 | #include <linux/config.h> | |||
| 10 | #include <linux/completion.h> | |||
| 11 | #include <linux/ip.h> | |||
| 12 | #include <linux/module.h> | |||
| 13 | #include <linux/smp_lock.h> | |||
| 14 | #include <linux/sunrpc/svc.h> | |||
| 15 | #include <linux/sunrpc/svcsock.h> | |||
| 16 | #include <linux/nfs_fs.h> | |||
| 17 | ||||
| 18 | #include <net/inet_sock.h> | |||
| 19 | ||||
| 20 | #include "nfs4_fs.h" | |||
| 21 | #include "callback.h" | |||
| 22 | ||||
| 23 | #define NFSDBG_FACILITY NFSDBG_CALLBACK | |||
| 24 | ||||
| 25 | struct nfs_callback_data { | |||
| 26 | unsigned int users; | |||
| 27 | struct svc_serv *serv; | |||
| 28 | pid_t pid; | |||
| 29 | struct completion started; | |||
| 30 | struct completion stopped; | |||
| 31 | }; | |||
| 32 | ||||
| 33 | static struct nfs_callback_data nfs_callback_info; | |||
| 34 | static DECLARE_MUTEX(nfs_callback_sema); | |||
| 35 | static struct svc_program nfs4_callback_program; | |||
| 36 | ||||
| 37 | unsigned int nfs_callback_set_tcpport; | |||
| 38 | unsigned short nfs_callback_tcpport; | |||
| 39 | ||||
| 40 | /* | |||
| 41 | * This is the callback kernel thread. | |||
| 42 | */ | |||
| 0 | 0 | - | 43 | static void nfs_callback_svc(struct svc_rqst *rqstp) |
| 44 | { | |||
| 45 | struct svc_serv *serv = rqstp->rq_server; | |||
| 46 | int err; | |||
| 47 | ||||
| 48 | __module_get(THIS_MODULE); | |||
| 49 | lock_kernel(); | |||
| 0 | 0 | - | 49 | do-while (0) |
| 50 | ||||
| 51 | nfs_callback_info.pid = current->pid; | |||
| 52 | daemonize("nfsv4-svc"); | |||
| 53 | /* Process request with signals blocked, but allow SIGKILL. */ | |||
| 54 | allow_signal(SIGKILL); | |||
| 55 | ||||
| 56 | complete(&nfs_callback_info.started); | |||
| 57 | ||||
| 0 | 0 | - | 58 | while (nfs_callback_info.users != 0 || !signalled()) { |
| 0 | - | 58 | T || !(_) | |
| 0 | - | 58 | F || !(F) | |
| 0 | - | 58 | F || !(T) | |
| 59 | /* | |||
| 60 | * Listen for a request on the socket | |||
| 61 | */ | |||
| 62 | err = svc_recv(serv, rqstp, MAX_SCHEDULE_TIMEOUT); | |||
| 0 | 0 | - | 63 | if (err == -EAGAIN || err == -EINTR) |
| 0 | - | 63 | T || _ | |
| 0 | - | 63 | F || T | |
| 0 | - | 63 | F || F | |
| 0 | - | 64 | continue; | |
| 0 | 0 | - | 65 | if (err < 0) { |
| 66 | printk(KERN_WARNING | |||
| 67 | "%s: terminating on error %d\n", | |||
| 68 | __FUNCTION__, -err); | |||
| 0 | - | 69 | break; | |
| 70 | } | |||
| 71 | dprintk("%s: request from %u.%u.%u.%u\n", __FUNCTION__, | |||
| 0 | 0 | - | 71 | if (__builtin_expect ( ! ! ( nfs_debug & 0.. |
| 0 | 0 | - | 71 | do-while (0) |
| 72 | NIPQUAD(rqstp->rq_addr.sin_addr.s_addr)); | |||
| 73 | svc_process(serv, rqstp); | |||
| 74 | } | |||
| 75 | ||||
| 76 | nfs_callback_info.pid = 0; | |||
| 77 | complete(&nfs_callback_info.stopped); | |||
| 78 | unlock_kernel(); | |||
| 0 | 0 | - | 78 | do-while (0) |
| 79 | module_put_and_exit(0); | |||
| 80 | } | |||
| 81 | ||||
| 82 | /* | |||
| 83 | * Bring up the server process if it is not already up. | |||
| 84 | */ | |||
| 0 | 0 | - | 85 | int nfs_callback_up(void) |
| 86 | { | |||
| 87 | struct svc_serv *serv; | |||
| 88 | struct svc_sock *svsk; | |||
| 89 | int ret = 0; | |||
| 90 | ||||
| 91 | lock_kernel(); | |||
| 0 | 0 | - | 91 | do-while (0) |
| 92 | down(&nfs_callback_sema); | |||
| 0 | 0 | - | 93 | if (nfs_callback_info.users++ || nfs_callback_info.pid != 0) |
| 0 | - | 93 | T || _ | |
| 0 | - | 93 | F || T | |
| 0 | - | 93 | F || F | |
| 0 | - | 94 | goto out; | |
| 95 | init_completion(&nfs_callback_info.started); | |||
| 96 | init_completion(&nfs_callback_info.stopped); | |||
| 97 | serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE); | |||
| 98 | ret = -ENOMEM; | |||
| 0 | 0 | - | 99 | if (!serv) |
| 0 | - | 100 | goto out_err; | |
| 101 | /* FIXME: We don't want to register this socket with the portmapper */ | |||
| 102 | ret = svc_makesock(serv, IPPROTO_TCP, nfs_callback_set_tcpport); | |||
| 0 | 0 | - | 103 | if (ret < 0) |
| 0 | - | 104 | goto out_destroy; | |
| 0 | 0 | - | 105 | if (!list_empty(&serv->sv_permsocks)) { |
| 106 | svsk = list_entry(serv->sv_permsocks.next, | |||
| 107 | struct svc_sock, sk_list); | |||
| 108 | nfs_callback_tcpport = ntohs(inet_sk(svsk->sk_sk)->sport); | |||
| 0 | 0 | - | 108 | ternary-?: __builtin_constant_p ( ( __u16 ) .. |
| 109 | dprintk ("Callback port = 0x%x\n", nfs_callback_tcpport); | |||
| 0 | 0 | - | 109 | if (__builtin_expect ( ! ! ( nfs_debug & 0.. |
| 0 | 0 | - | 109 | do-while (0) |
| 110 | } else | |||
| 111 | BUG(); | |||
| 112 | ret = svc_create_thread(nfs_callback_svc, serv); | |||
| 0 | 0 | - | 113 | if (ret < 0) |
| 0 | - | 114 | goto out_destroy; | |
| 115 | nfs_callback_info.serv = serv; | |||
| 116 | wait_for_completion(&nfs_callback_info.started); | |||
| 117 | out: | |||
| 118 | up(&nfs_callback_sema); | |||
| 119 | unlock_kernel(); | |||
| 0 | 0 | - | 119 | do-while (0) |
| 0 | - | 120 | return ret; | |
| 121 | out_destroy: | |||
| 122 | svc_destroy(serv); | |||
| 123 | out_err: | |||
| 124 | nfs_callback_info.users--; | |||
| 0 | - | 125 | goto out; | |
| 126 | } | |||
| 127 | ||||
| 128 | /* | |||
| 129 | * Kill the server process if it is not already up. | |||
| 130 | */ | |||
| 0 | 0 | - | 131 | int nfs_callback_down(void) |
| 132 | { | |||
| 133 | int ret = 0; | |||
| 134 | ||||
| 135 | lock_kernel(); | |||
| 0 | 0 | - | 135 | do-while (0) |
| 136 | down(&nfs_callback_sema); | |||
| 0 | 0 | - | 137 | if (--nfs_callback_info.users || nfs_callback_info.pid == 0) |
| 0 | - | 137 | T || _ | |
| 0 | - | 137 | F || T | |
| 0 | - | 137 | F || F | |
| 0 | - | 138 | goto out; | |
| 139 | kill_proc(nfs_callback_info.pid, SIGKILL, 1); | |||
| 140 | wait_for_completion(&nfs_callback_info.stopped); | |||
| 141 | out: | |||
| 142 | up(&nfs_callback_sema); | |||
| 143 | unlock_kernel(); | |||
| 0 | 0 | - | 143 | do-while (0) |
| 0 | - | 144 | return ret; | |
| 145 | } | |||
| 146 | ||||
| 0 | 0 | - | 147 | static int nfs_callback_authenticate(struct svc_rqst *rqstp) |
| 148 | { | |||
| 149 | struct in_addr *addr = &rqstp->rq_addr.sin_addr; | |||
| 150 | struct nfs4_client *clp; | |||
| 151 | ||||
| 152 | /* Don't talk to strangers */ | |||
| 153 | clp = nfs4_find_client(addr); | |||
| 0 | 0 | - | 154 | if (clp == NULL) |
| 0 | - | 155 | return SVC_DROP; | |
| 156 | dprintk("%s: %u.%u.%u.%u NFSv4 callback!\n", __FUNCTION__, NIPQUAD(addr)); | |||
| 0 | 0 | - | 156 | if (__builtin_expect ( ! ! ( nfs_debug & 0x0.. |
| 0 | 0 | - | 156 | do-while (0) |
| 157 | nfs4_put_client(clp); | |||
| 158 | switch (rqstp->rq_authop->flavour) { | |||
| 0 | - | 159 | case RPC_AUTH_NULL: | |
| 0 | 0 | - | 160 | if (rqstp->rq_proc != CB_NULL) |
| 0 | - | 161 | return SVC_DENIED; | |
| 0 | - | 162 | break; | |
| 0 | - | 163 | case RPC_AUTH_UNIX: | |
| 0 | - | 164 | break; | |
| 0 | - | 165 | case RPC_AUTH_GSS: | |
| 166 | /* FIXME: RPCSEC_GSS handling? */ | |||
| 0 | - | 167 | default: | |
| 0 | - | 168 | return SVC_DENIED; | |
| 169 | } | |||
| 0 | - | 170 | return SVC_OK; | |
| 171 | } | |||
| 172 | ||||
| 173 | /* | |||
| 174 | * Define NFS4 callback program | |||
| 175 | */ | |||
| 176 | extern struct svc_version nfs4_callback_version1; | |||
| 177 | ||||
| 178 | static struct svc_version *nfs4_callback_version[] = { | |||
| 179 | [1] = &nfs4_callback_version1, | |||
| 180 | }; | |||
| 181 | ||||
| 182 | static struct svc_stat nfs4_callback_stats; | |||
| 183 | ||||
| 184 | static struct svc_program nfs4_callback_program = { | |||
| 185 | .pg_prog = NFS4_CALLBACK, /* RPC service number */ | |||
| 186 | .pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */ | |||
| 187 | .pg_vers = nfs4_callback_version, /* version table */ | |||
| 188 | .pg_name = "NFSv4 callback", /* service name */ | |||
| 189 | .pg_class = "nfs", /* authentication class */ | |||
| 190 | .pg_stats = &nfs4_callback_stats, | |||
| 191 | .pg_authenticate = nfs_callback_authenticate, | |||
| 192 | }; | |||
| ***TER 0% (0/84) of SOURCE FILE callback.c | ||||