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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /* AF_RXRPC implementation
0003  *
0004  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
0005  * Written by David Howells (dhowells@redhat.com)
0006  */
0007 
0008 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0009 
0010 #include <linux/module.h>
0011 #include <linux/kernel.h>
0012 #include <linux/net.h>
0013 #include <linux/slab.h>
0014 #include <linux/skbuff.h>
0015 #include <linux/random.h>
0016 #include <linux/poll.h>
0017 #include <linux/proc_fs.h>
0018 #include <linux/key-type.h>
0019 #include <net/net_namespace.h>
0020 #include <net/sock.h>
0021 #include <net/af_rxrpc.h>
0022 #define CREATE_TRACE_POINTS
0023 #include "ar-internal.h"
0024 
0025 MODULE_DESCRIPTION("RxRPC network protocol");
0026 MODULE_AUTHOR("Red Hat, Inc.");
0027 MODULE_LICENSE("GPL");
0028 MODULE_ALIAS_NETPROTO(PF_RXRPC);
0029 
0030 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
0031 module_param_named(debug, rxrpc_debug, uint, 0644);
0032 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
0033 
0034 static struct proto rxrpc_proto;
0035 static const struct proto_ops rxrpc_rpc_ops;
0036 
0037 /* current debugging ID */
0038 atomic_t rxrpc_debug_id;
0039 EXPORT_SYMBOL(rxrpc_debug_id);
0040 
0041 /* count of skbs currently in use */
0042 atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
0043 
0044 struct workqueue_struct *rxrpc_workqueue;
0045 
0046 static void rxrpc_sock_destructor(struct sock *);
0047 
0048 /*
0049  * see if an RxRPC socket is currently writable
0050  */
0051 static inline int rxrpc_writable(struct sock *sk)
0052 {
0053     return refcount_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
0054 }
0055 
0056 /*
0057  * wait for write bufferage to become available
0058  */
0059 static void rxrpc_write_space(struct sock *sk)
0060 {
0061     _enter("%p", sk);
0062     rcu_read_lock();
0063     if (rxrpc_writable(sk)) {
0064         struct socket_wq *wq = rcu_dereference(sk->sk_wq);
0065 
0066         if (skwq_has_sleeper(wq))
0067             wake_up_interruptible(&wq->wait);
0068         sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
0069     }
0070     rcu_read_unlock();
0071 }
0072 
0073 /*
0074  * validate an RxRPC address
0075  */
0076 static int rxrpc_validate_address(struct rxrpc_sock *rx,
0077                   struct sockaddr_rxrpc *srx,
0078                   int len)
0079 {
0080     unsigned int tail;
0081 
0082     if (len < sizeof(struct sockaddr_rxrpc))
0083         return -EINVAL;
0084 
0085     if (srx->srx_family != AF_RXRPC)
0086         return -EAFNOSUPPORT;
0087 
0088     if (srx->transport_type != SOCK_DGRAM)
0089         return -ESOCKTNOSUPPORT;
0090 
0091     len -= offsetof(struct sockaddr_rxrpc, transport);
0092     if (srx->transport_len < sizeof(sa_family_t) ||
0093         srx->transport_len > len)
0094         return -EINVAL;
0095 
0096     if (srx->transport.family != rx->family &&
0097         srx->transport.family == AF_INET && rx->family != AF_INET6)
0098         return -EAFNOSUPPORT;
0099 
0100     switch (srx->transport.family) {
0101     case AF_INET:
0102         if (srx->transport_len < sizeof(struct sockaddr_in))
0103             return -EINVAL;
0104         tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
0105         break;
0106 
0107 #ifdef CONFIG_AF_RXRPC_IPV6
0108     case AF_INET6:
0109         if (srx->transport_len < sizeof(struct sockaddr_in6))
0110             return -EINVAL;
0111         tail = offsetof(struct sockaddr_rxrpc, transport) +
0112             sizeof(struct sockaddr_in6);
0113         break;
0114 #endif
0115 
0116     default:
0117         return -EAFNOSUPPORT;
0118     }
0119 
0120     if (tail < len)
0121         memset((void *)srx + tail, 0, len - tail);
0122     _debug("INET: %pISp", &srx->transport);
0123     return 0;
0124 }
0125 
0126 /*
0127  * bind a local address to an RxRPC socket
0128  */
0129 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
0130 {
0131     struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
0132     struct rxrpc_local *local;
0133     struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
0134     u16 service_id;
0135     int ret;
0136 
0137     _enter("%p,%p,%d", rx, saddr, len);
0138 
0139     ret = rxrpc_validate_address(rx, srx, len);
0140     if (ret < 0)
0141         goto error;
0142     service_id = srx->srx_service;
0143 
0144     lock_sock(&rx->sk);
0145 
0146     switch (rx->sk.sk_state) {
0147     case RXRPC_UNBOUND:
0148         rx->srx = *srx;
0149         local = rxrpc_lookup_local(sock_net(&rx->sk), &rx->srx);
0150         if (IS_ERR(local)) {
0151             ret = PTR_ERR(local);
0152             goto error_unlock;
0153         }
0154 
0155         if (service_id) {
0156             write_lock(&local->services_lock);
0157             if (rcu_access_pointer(local->service))
0158                 goto service_in_use;
0159             rx->local = local;
0160             rcu_assign_pointer(local->service, rx);
0161             write_unlock(&local->services_lock);
0162 
0163             rx->sk.sk_state = RXRPC_SERVER_BOUND;
0164         } else {
0165             rx->local = local;
0166             rx->sk.sk_state = RXRPC_CLIENT_BOUND;
0167         }
0168         break;
0169 
0170     case RXRPC_SERVER_BOUND:
0171         ret = -EINVAL;
0172         if (service_id == 0)
0173             goto error_unlock;
0174         ret = -EADDRINUSE;
0175         if (service_id == rx->srx.srx_service)
0176             goto error_unlock;
0177         ret = -EINVAL;
0178         srx->srx_service = rx->srx.srx_service;
0179         if (memcmp(srx, &rx->srx, sizeof(*srx)) != 0)
0180             goto error_unlock;
0181         rx->second_service = service_id;
0182         rx->sk.sk_state = RXRPC_SERVER_BOUND2;
0183         break;
0184 
0185     default:
0186         ret = -EINVAL;
0187         goto error_unlock;
0188     }
0189 
0190     release_sock(&rx->sk);
0191     _leave(" = 0");
0192     return 0;
0193 
0194 service_in_use:
0195     write_unlock(&local->services_lock);
0196     rxrpc_unuse_local(local);
0197     rxrpc_put_local(local);
0198     ret = -EADDRINUSE;
0199 error_unlock:
0200     release_sock(&rx->sk);
0201 error:
0202     _leave(" = %d", ret);
0203     return ret;
0204 }
0205 
0206 /*
0207  * set the number of pending calls permitted on a listening socket
0208  */
0209 static int rxrpc_listen(struct socket *sock, int backlog)
0210 {
0211     struct sock *sk = sock->sk;
0212     struct rxrpc_sock *rx = rxrpc_sk(sk);
0213     unsigned int max, old;
0214     int ret;
0215 
0216     _enter("%p,%d", rx, backlog);
0217 
0218     lock_sock(&rx->sk);
0219 
0220     switch (rx->sk.sk_state) {
0221     case RXRPC_UNBOUND:
0222         ret = -EADDRNOTAVAIL;
0223         break;
0224     case RXRPC_SERVER_BOUND:
0225     case RXRPC_SERVER_BOUND2:
0226         ASSERT(rx->local != NULL);
0227         max = READ_ONCE(rxrpc_max_backlog);
0228         ret = -EINVAL;
0229         if (backlog == INT_MAX)
0230             backlog = max;
0231         else if (backlog < 0 || backlog > max)
0232             break;
0233         old = sk->sk_max_ack_backlog;
0234         sk->sk_max_ack_backlog = backlog;
0235         ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
0236         if (ret == 0)
0237             rx->sk.sk_state = RXRPC_SERVER_LISTENING;
0238         else
0239             sk->sk_max_ack_backlog = old;
0240         break;
0241     case RXRPC_SERVER_LISTENING:
0242         if (backlog == 0) {
0243             rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
0244             sk->sk_max_ack_backlog = 0;
0245             rxrpc_discard_prealloc(rx);
0246             ret = 0;
0247             break;
0248         }
0249         fallthrough;
0250     default:
0251         ret = -EBUSY;
0252         break;
0253     }
0254 
0255     release_sock(&rx->sk);
0256     _leave(" = %d", ret);
0257     return ret;
0258 }
0259 
0260 /**
0261  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
0262  * @sock: The socket on which to make the call
0263  * @srx: The address of the peer to contact
0264  * @key: The security context to use (defaults to socket setting)
0265  * @user_call_ID: The ID to use
0266  * @tx_total_len: Total length of data to transmit during the call (or -1)
0267  * @gfp: The allocation constraints
0268  * @notify_rx: Where to send notifications instead of socket queue
0269  * @upgrade: Request service upgrade for call
0270  * @interruptibility: The call is interruptible, or can be canceled.
0271  * @debug_id: The debug ID for tracing to be assigned to the call
0272  *
0273  * Allow a kernel service to begin a call on the nominated socket.  This just
0274  * sets up all the internal tracking structures and allocates connection and
0275  * call IDs as appropriate.  The call to be used is returned.
0276  *
0277  * The default socket destination address and security may be overridden by
0278  * supplying @srx and @key.
0279  */
0280 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
0281                        struct sockaddr_rxrpc *srx,
0282                        struct key *key,
0283                        unsigned long user_call_ID,
0284                        s64 tx_total_len,
0285                        gfp_t gfp,
0286                        rxrpc_notify_rx_t notify_rx,
0287                        bool upgrade,
0288                        enum rxrpc_interruptibility interruptibility,
0289                        unsigned int debug_id)
0290 {
0291     struct rxrpc_conn_parameters cp;
0292     struct rxrpc_call_params p;
0293     struct rxrpc_call *call;
0294     struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
0295     int ret;
0296 
0297     _enter(",,%x,%lx", key_serial(key), user_call_ID);
0298 
0299     ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
0300     if (ret < 0)
0301         return ERR_PTR(ret);
0302 
0303     lock_sock(&rx->sk);
0304 
0305     if (!key)
0306         key = rx->key;
0307     if (key && !key->payload.data[0])
0308         key = NULL; /* a no-security key */
0309 
0310     memset(&p, 0, sizeof(p));
0311     p.user_call_ID      = user_call_ID;
0312     p.tx_total_len      = tx_total_len;
0313     p.interruptibility  = interruptibility;
0314     p.kernel        = true;
0315 
0316     memset(&cp, 0, sizeof(cp));
0317     cp.local        = rx->local;
0318     cp.key          = key;
0319     cp.security_level   = rx->min_sec_level;
0320     cp.exclusive        = false;
0321     cp.upgrade      = upgrade;
0322     cp.service_id       = srx->srx_service;
0323     call = rxrpc_new_client_call(rx, &cp, srx, &p, gfp, debug_id);
0324     /* The socket has been unlocked. */
0325     if (!IS_ERR(call)) {
0326         call->notify_rx = notify_rx;
0327         mutex_unlock(&call->user_mutex);
0328     }
0329 
0330     rxrpc_put_peer(cp.peer);
0331     _leave(" = %p", call);
0332     return call;
0333 }
0334 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
0335 
0336 /*
0337  * Dummy function used to stop the notifier talking to recvmsg().
0338  */
0339 static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
0340                   unsigned long call_user_ID)
0341 {
0342 }
0343 
0344 /**
0345  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
0346  * @sock: The socket the call is on
0347  * @call: The call to end
0348  *
0349  * Allow a kernel service to end a call it was using.  The call must be
0350  * complete before this is called (the call should be aborted if necessary).
0351  */
0352 void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
0353 {
0354     _enter("%d{%d}", call->debug_id, refcount_read(&call->ref));
0355 
0356     mutex_lock(&call->user_mutex);
0357     rxrpc_release_call(rxrpc_sk(sock->sk), call);
0358 
0359     /* Make sure we're not going to call back into a kernel service */
0360     if (call->notify_rx) {
0361         spin_lock_bh(&call->notify_lock);
0362         call->notify_rx = rxrpc_dummy_notify_rx;
0363         spin_unlock_bh(&call->notify_lock);
0364     }
0365 
0366     mutex_unlock(&call->user_mutex);
0367     rxrpc_put_call(call, rxrpc_call_put_kernel);
0368 }
0369 EXPORT_SYMBOL(rxrpc_kernel_end_call);
0370 
0371 /**
0372  * rxrpc_kernel_check_life - Check to see whether a call is still alive
0373  * @sock: The socket the call is on
0374  * @call: The call to check
0375  *
0376  * Allow a kernel service to find out whether a call is still alive -
0377  * ie. whether it has completed.
0378  */
0379 bool rxrpc_kernel_check_life(const struct socket *sock,
0380                  const struct rxrpc_call *call)
0381 {
0382     return call->state != RXRPC_CALL_COMPLETE;
0383 }
0384 EXPORT_SYMBOL(rxrpc_kernel_check_life);
0385 
0386 /**
0387  * rxrpc_kernel_get_epoch - Retrieve the epoch value from a call.
0388  * @sock: The socket the call is on
0389  * @call: The call to query
0390  *
0391  * Allow a kernel service to retrieve the epoch value from a service call to
0392  * see if the client at the other end rebooted.
0393  */
0394 u32 rxrpc_kernel_get_epoch(struct socket *sock, struct rxrpc_call *call)
0395 {
0396     return call->conn->proto.epoch;
0397 }
0398 EXPORT_SYMBOL(rxrpc_kernel_get_epoch);
0399 
0400 /**
0401  * rxrpc_kernel_new_call_notification - Get notifications of new calls
0402  * @sock: The socket to intercept received messages on
0403  * @notify_new_call: Function to be called when new calls appear
0404  * @discard_new_call: Function to discard preallocated calls
0405  *
0406  * Allow a kernel service to be given notifications about new calls.
0407  */
0408 void rxrpc_kernel_new_call_notification(
0409     struct socket *sock,
0410     rxrpc_notify_new_call_t notify_new_call,
0411     rxrpc_discard_new_call_t discard_new_call)
0412 {
0413     struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
0414 
0415     rx->notify_new_call = notify_new_call;
0416     rx->discard_new_call = discard_new_call;
0417 }
0418 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
0419 
0420 /**
0421  * rxrpc_kernel_set_max_life - Set maximum lifespan on a call
0422  * @sock: The socket the call is on
0423  * @call: The call to configure
0424  * @hard_timeout: The maximum lifespan of the call in jiffies
0425  *
0426  * Set the maximum lifespan of a call.  The call will end with ETIME or
0427  * ETIMEDOUT if it takes longer than this.
0428  */
0429 void rxrpc_kernel_set_max_life(struct socket *sock, struct rxrpc_call *call,
0430                    unsigned long hard_timeout)
0431 {
0432     unsigned long now;
0433 
0434     mutex_lock(&call->user_mutex);
0435 
0436     now = jiffies;
0437     hard_timeout += now;
0438     WRITE_ONCE(call->expect_term_by, hard_timeout);
0439     rxrpc_reduce_call_timer(call, hard_timeout, now, rxrpc_timer_set_for_hard);
0440 
0441     mutex_unlock(&call->user_mutex);
0442 }
0443 EXPORT_SYMBOL(rxrpc_kernel_set_max_life);
0444 
0445 /*
0446  * connect an RxRPC socket
0447  * - this just targets it at a specific destination; no actual connection
0448  *   negotiation takes place
0449  */
0450 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
0451              int addr_len, int flags)
0452 {
0453     struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
0454     struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
0455     int ret;
0456 
0457     _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
0458 
0459     ret = rxrpc_validate_address(rx, srx, addr_len);
0460     if (ret < 0) {
0461         _leave(" = %d [bad addr]", ret);
0462         return ret;
0463     }
0464 
0465     lock_sock(&rx->sk);
0466 
0467     ret = -EISCONN;
0468     if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
0469         goto error;
0470 
0471     switch (rx->sk.sk_state) {
0472     case RXRPC_UNBOUND:
0473         rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
0474         break;
0475     case RXRPC_CLIENT_UNBOUND:
0476     case RXRPC_CLIENT_BOUND:
0477         break;
0478     default:
0479         ret = -EBUSY;
0480         goto error;
0481     }
0482 
0483     rx->connect_srx = *srx;
0484     set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
0485     ret = 0;
0486 
0487 error:
0488     release_sock(&rx->sk);
0489     return ret;
0490 }
0491 
0492 /*
0493  * send a message through an RxRPC socket
0494  * - in a client this does a number of things:
0495  *   - finds/sets up a connection for the security specified (if any)
0496  *   - initiates a call (ID in control data)
0497  *   - ends the request phase of a call (if MSG_MORE is not set)
0498  *   - sends a call data packet
0499  *   - may send an abort (abort code in control data)
0500  */
0501 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
0502 {
0503     struct rxrpc_local *local;
0504     struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
0505     int ret;
0506 
0507     _enter(",{%d},,%zu", rx->sk.sk_state, len);
0508 
0509     if (m->msg_flags & MSG_OOB)
0510         return -EOPNOTSUPP;
0511 
0512     if (m->msg_name) {
0513         ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
0514         if (ret < 0) {
0515             _leave(" = %d [bad addr]", ret);
0516             return ret;
0517         }
0518     }
0519 
0520     lock_sock(&rx->sk);
0521 
0522     switch (rx->sk.sk_state) {
0523     case RXRPC_UNBOUND:
0524     case RXRPC_CLIENT_UNBOUND:
0525         rx->srx.srx_family = AF_RXRPC;
0526         rx->srx.srx_service = 0;
0527         rx->srx.transport_type = SOCK_DGRAM;
0528         rx->srx.transport.family = rx->family;
0529         switch (rx->family) {
0530         case AF_INET:
0531             rx->srx.transport_len = sizeof(struct sockaddr_in);
0532             break;
0533 #ifdef CONFIG_AF_RXRPC_IPV6
0534         case AF_INET6:
0535             rx->srx.transport_len = sizeof(struct sockaddr_in6);
0536             break;
0537 #endif
0538         default:
0539             ret = -EAFNOSUPPORT;
0540             goto error_unlock;
0541         }
0542         local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
0543         if (IS_ERR(local)) {
0544             ret = PTR_ERR(local);
0545             goto error_unlock;
0546         }
0547 
0548         rx->local = local;
0549         rx->sk.sk_state = RXRPC_CLIENT_BOUND;
0550         fallthrough;
0551 
0552     case RXRPC_CLIENT_BOUND:
0553         if (!m->msg_name &&
0554             test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
0555             m->msg_name = &rx->connect_srx;
0556             m->msg_namelen = sizeof(rx->connect_srx);
0557         }
0558         fallthrough;
0559     case RXRPC_SERVER_BOUND:
0560     case RXRPC_SERVER_LISTENING:
0561         ret = rxrpc_do_sendmsg(rx, m, len);
0562         /* The socket has been unlocked */
0563         goto out;
0564     default:
0565         ret = -EINVAL;
0566         goto error_unlock;
0567     }
0568 
0569 error_unlock:
0570     release_sock(&rx->sk);
0571 out:
0572     _leave(" = %d", ret);
0573     return ret;
0574 }
0575 
0576 int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val)
0577 {
0578     if (sk->sk_state != RXRPC_UNBOUND)
0579         return -EISCONN;
0580     if (val > RXRPC_SECURITY_MAX)
0581         return -EINVAL;
0582     lock_sock(sk);
0583     rxrpc_sk(sk)->min_sec_level = val;
0584     release_sock(sk);
0585     return 0;
0586 }
0587 EXPORT_SYMBOL(rxrpc_sock_set_min_security_level);
0588 
0589 /*
0590  * set RxRPC socket options
0591  */
0592 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
0593                 sockptr_t optval, unsigned int optlen)
0594 {
0595     struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
0596     unsigned int min_sec_level;
0597     u16 service_upgrade[2];
0598     int ret;
0599 
0600     _enter(",%d,%d,,%d", level, optname, optlen);
0601 
0602     lock_sock(&rx->sk);
0603     ret = -EOPNOTSUPP;
0604 
0605     if (level == SOL_RXRPC) {
0606         switch (optname) {
0607         case RXRPC_EXCLUSIVE_CONNECTION:
0608             ret = -EINVAL;
0609             if (optlen != 0)
0610                 goto error;
0611             ret = -EISCONN;
0612             if (rx->sk.sk_state != RXRPC_UNBOUND)
0613                 goto error;
0614             rx->exclusive = true;
0615             goto success;
0616 
0617         case RXRPC_SECURITY_KEY:
0618             ret = -EINVAL;
0619             if (rx->key)
0620                 goto error;
0621             ret = -EISCONN;
0622             if (rx->sk.sk_state != RXRPC_UNBOUND)
0623                 goto error;
0624             ret = rxrpc_request_key(rx, optval, optlen);
0625             goto error;
0626 
0627         case RXRPC_SECURITY_KEYRING:
0628             ret = -EINVAL;
0629             if (rx->key)
0630                 goto error;
0631             ret = -EISCONN;
0632             if (rx->sk.sk_state != RXRPC_UNBOUND)
0633                 goto error;
0634             ret = rxrpc_server_keyring(rx, optval, optlen);
0635             goto error;
0636 
0637         case RXRPC_MIN_SECURITY_LEVEL:
0638             ret = -EINVAL;
0639             if (optlen != sizeof(unsigned int))
0640                 goto error;
0641             ret = -EISCONN;
0642             if (rx->sk.sk_state != RXRPC_UNBOUND)
0643                 goto error;
0644             ret = copy_from_sockptr(&min_sec_level, optval,
0645                        sizeof(unsigned int));
0646             if (ret < 0)
0647                 goto error;
0648             ret = -EINVAL;
0649             if (min_sec_level > RXRPC_SECURITY_MAX)
0650                 goto error;
0651             rx->min_sec_level = min_sec_level;
0652             goto success;
0653 
0654         case RXRPC_UPGRADEABLE_SERVICE:
0655             ret = -EINVAL;
0656             if (optlen != sizeof(service_upgrade) ||
0657                 rx->service_upgrade.from != 0)
0658                 goto error;
0659             ret = -EISCONN;
0660             if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
0661                 goto error;
0662             ret = -EFAULT;
0663             if (copy_from_sockptr(service_upgrade, optval,
0664                        sizeof(service_upgrade)) != 0)
0665                 goto error;
0666             ret = -EINVAL;
0667             if ((service_upgrade[0] != rx->srx.srx_service ||
0668                  service_upgrade[1] != rx->second_service) &&
0669                 (service_upgrade[0] != rx->second_service ||
0670                  service_upgrade[1] != rx->srx.srx_service))
0671                 goto error;
0672             rx->service_upgrade.from = service_upgrade[0];
0673             rx->service_upgrade.to = service_upgrade[1];
0674             goto success;
0675 
0676         default:
0677             break;
0678         }
0679     }
0680 
0681 success:
0682     ret = 0;
0683 error:
0684     release_sock(&rx->sk);
0685     return ret;
0686 }
0687 
0688 /*
0689  * Get socket options.
0690  */
0691 static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
0692                 char __user *optval, int __user *_optlen)
0693 {
0694     int optlen;
0695 
0696     if (level != SOL_RXRPC)
0697         return -EOPNOTSUPP;
0698 
0699     if (get_user(optlen, _optlen))
0700         return -EFAULT;
0701 
0702     switch (optname) {
0703     case RXRPC_SUPPORTED_CMSG:
0704         if (optlen < sizeof(int))
0705             return -ETOOSMALL;
0706         if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
0707             put_user(sizeof(int), _optlen))
0708             return -EFAULT;
0709         return 0;
0710 
0711     default:
0712         return -EOPNOTSUPP;
0713     }
0714 }
0715 
0716 /*
0717  * permit an RxRPC socket to be polled
0718  */
0719 static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
0720                    poll_table *wait)
0721 {
0722     struct sock *sk = sock->sk;
0723     struct rxrpc_sock *rx = rxrpc_sk(sk);
0724     __poll_t mask;
0725 
0726     sock_poll_wait(file, sock, wait);
0727     mask = 0;
0728 
0729     /* the socket is readable if there are any messages waiting on the Rx
0730      * queue */
0731     if (!list_empty(&rx->recvmsg_q))
0732         mask |= EPOLLIN | EPOLLRDNORM;
0733 
0734     /* the socket is writable if there is space to add new data to the
0735      * socket; there is no guarantee that any particular call in progress
0736      * on the socket may have space in the Tx ACK window */
0737     if (rxrpc_writable(sk))
0738         mask |= EPOLLOUT | EPOLLWRNORM;
0739 
0740     return mask;
0741 }
0742 
0743 /*
0744  * create an RxRPC socket
0745  */
0746 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
0747             int kern)
0748 {
0749     struct rxrpc_net *rxnet;
0750     struct rxrpc_sock *rx;
0751     struct sock *sk;
0752 
0753     _enter("%p,%d", sock, protocol);
0754 
0755     /* we support transport protocol UDP/UDP6 only */
0756     if (protocol != PF_INET &&
0757         IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
0758         return -EPROTONOSUPPORT;
0759 
0760     if (sock->type != SOCK_DGRAM)
0761         return -ESOCKTNOSUPPORT;
0762 
0763     sock->ops = &rxrpc_rpc_ops;
0764     sock->state = SS_UNCONNECTED;
0765 
0766     sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
0767     if (!sk)
0768         return -ENOMEM;
0769 
0770     sock_init_data(sock, sk);
0771     sock_set_flag(sk, SOCK_RCU_FREE);
0772     sk->sk_state        = RXRPC_UNBOUND;
0773     sk->sk_write_space  = rxrpc_write_space;
0774     sk->sk_max_ack_backlog  = 0;
0775     sk->sk_destruct     = rxrpc_sock_destructor;
0776 
0777     rx = rxrpc_sk(sk);
0778     rx->family = protocol;
0779     rx->calls = RB_ROOT;
0780 
0781     spin_lock_init(&rx->incoming_lock);
0782     INIT_LIST_HEAD(&rx->sock_calls);
0783     INIT_LIST_HEAD(&rx->to_be_accepted);
0784     INIT_LIST_HEAD(&rx->recvmsg_q);
0785     rwlock_init(&rx->recvmsg_lock);
0786     rwlock_init(&rx->call_lock);
0787     memset(&rx->srx, 0, sizeof(rx->srx));
0788 
0789     rxnet = rxrpc_net(sock_net(&rx->sk));
0790     timer_reduce(&rxnet->peer_keepalive_timer, jiffies + 1);
0791 
0792     _leave(" = 0 [%p]", rx);
0793     return 0;
0794 }
0795 
0796 /*
0797  * Kill all the calls on a socket and shut it down.
0798  */
0799 static int rxrpc_shutdown(struct socket *sock, int flags)
0800 {
0801     struct sock *sk = sock->sk;
0802     struct rxrpc_sock *rx = rxrpc_sk(sk);
0803     int ret = 0;
0804 
0805     _enter("%p,%d", sk, flags);
0806 
0807     if (flags != SHUT_RDWR)
0808         return -EOPNOTSUPP;
0809     if (sk->sk_state == RXRPC_CLOSE)
0810         return -ESHUTDOWN;
0811 
0812     lock_sock(sk);
0813 
0814     spin_lock_bh(&sk->sk_receive_queue.lock);
0815     if (sk->sk_state < RXRPC_CLOSE) {
0816         sk->sk_state = RXRPC_CLOSE;
0817         sk->sk_shutdown = SHUTDOWN_MASK;
0818     } else {
0819         ret = -ESHUTDOWN;
0820     }
0821     spin_unlock_bh(&sk->sk_receive_queue.lock);
0822 
0823     rxrpc_discard_prealloc(rx);
0824 
0825     release_sock(sk);
0826     return ret;
0827 }
0828 
0829 /*
0830  * RxRPC socket destructor
0831  */
0832 static void rxrpc_sock_destructor(struct sock *sk)
0833 {
0834     _enter("%p", sk);
0835 
0836     rxrpc_purge_queue(&sk->sk_receive_queue);
0837 
0838     WARN_ON(refcount_read(&sk->sk_wmem_alloc));
0839     WARN_ON(!sk_unhashed(sk));
0840     WARN_ON(sk->sk_socket);
0841 
0842     if (!sock_flag(sk, SOCK_DEAD)) {
0843         printk("Attempt to release alive rxrpc socket: %p\n", sk);
0844         return;
0845     }
0846 }
0847 
0848 /*
0849  * release an RxRPC socket
0850  */
0851 static int rxrpc_release_sock(struct sock *sk)
0852 {
0853     struct rxrpc_sock *rx = rxrpc_sk(sk);
0854 
0855     _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt));
0856 
0857     /* declare the socket closed for business */
0858     sock_orphan(sk);
0859     sk->sk_shutdown = SHUTDOWN_MASK;
0860 
0861     /* We want to kill off all connections from a service socket
0862      * as fast as possible because we can't share these; client
0863      * sockets, on the other hand, can share an endpoint.
0864      */
0865     switch (sk->sk_state) {
0866     case RXRPC_SERVER_BOUND:
0867     case RXRPC_SERVER_BOUND2:
0868     case RXRPC_SERVER_LISTENING:
0869     case RXRPC_SERVER_LISTEN_DISABLED:
0870         rx->local->service_closed = true;
0871         break;
0872     }
0873 
0874     spin_lock_bh(&sk->sk_receive_queue.lock);
0875     sk->sk_state = RXRPC_CLOSE;
0876     spin_unlock_bh(&sk->sk_receive_queue.lock);
0877 
0878     if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
0879         write_lock(&rx->local->services_lock);
0880         rcu_assign_pointer(rx->local->service, NULL);
0881         write_unlock(&rx->local->services_lock);
0882     }
0883 
0884     /* try to flush out this socket */
0885     rxrpc_discard_prealloc(rx);
0886     rxrpc_release_calls_on_socket(rx);
0887     flush_workqueue(rxrpc_workqueue);
0888     rxrpc_purge_queue(&sk->sk_receive_queue);
0889 
0890     rxrpc_unuse_local(rx->local);
0891     rxrpc_put_local(rx->local);
0892     rx->local = NULL;
0893     key_put(rx->key);
0894     rx->key = NULL;
0895     key_put(rx->securities);
0896     rx->securities = NULL;
0897     sock_put(sk);
0898 
0899     _leave(" = 0");
0900     return 0;
0901 }
0902 
0903 /*
0904  * release an RxRPC BSD socket on close() or equivalent
0905  */
0906 static int rxrpc_release(struct socket *sock)
0907 {
0908     struct sock *sk = sock->sk;
0909 
0910     _enter("%p{%p}", sock, sk);
0911 
0912     if (!sk)
0913         return 0;
0914 
0915     sock->sk = NULL;
0916 
0917     return rxrpc_release_sock(sk);
0918 }
0919 
0920 /*
0921  * RxRPC network protocol
0922  */
0923 static const struct proto_ops rxrpc_rpc_ops = {
0924     .family     = PF_RXRPC,
0925     .owner      = THIS_MODULE,
0926     .release    = rxrpc_release,
0927     .bind       = rxrpc_bind,
0928     .connect    = rxrpc_connect,
0929     .socketpair = sock_no_socketpair,
0930     .accept     = sock_no_accept,
0931     .getname    = sock_no_getname,
0932     .poll       = rxrpc_poll,
0933     .ioctl      = sock_no_ioctl,
0934     .listen     = rxrpc_listen,
0935     .shutdown   = rxrpc_shutdown,
0936     .setsockopt = rxrpc_setsockopt,
0937     .getsockopt = rxrpc_getsockopt,
0938     .sendmsg    = rxrpc_sendmsg,
0939     .recvmsg    = rxrpc_recvmsg,
0940     .mmap       = sock_no_mmap,
0941     .sendpage   = sock_no_sendpage,
0942 };
0943 
0944 static struct proto rxrpc_proto = {
0945     .name       = "RXRPC",
0946     .owner      = THIS_MODULE,
0947     .obj_size   = sizeof(struct rxrpc_sock),
0948     .max_header = sizeof(struct rxrpc_wire_header),
0949 };
0950 
0951 static const struct net_proto_family rxrpc_family_ops = {
0952     .family = PF_RXRPC,
0953     .create = rxrpc_create,
0954     .owner  = THIS_MODULE,
0955 };
0956 
0957 /*
0958  * initialise and register the RxRPC protocol
0959  */
0960 static int __init af_rxrpc_init(void)
0961 {
0962     int ret = -1;
0963     unsigned int tmp;
0964 
0965     BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof_field(struct sk_buff, cb));
0966 
0967     get_random_bytes(&tmp, sizeof(tmp));
0968     tmp &= 0x3fffffff;
0969     if (tmp == 0)
0970         tmp = 1;
0971     idr_set_cursor(&rxrpc_client_conn_ids, tmp);
0972 
0973     ret = -ENOMEM;
0974     rxrpc_call_jar = kmem_cache_create(
0975         "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
0976         SLAB_HWCACHE_ALIGN, NULL);
0977     if (!rxrpc_call_jar) {
0978         pr_notice("Failed to allocate call jar\n");
0979         goto error_call_jar;
0980     }
0981 
0982     rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
0983     if (!rxrpc_workqueue) {
0984         pr_notice("Failed to allocate work queue\n");
0985         goto error_work_queue;
0986     }
0987 
0988     ret = rxrpc_init_security();
0989     if (ret < 0) {
0990         pr_crit("Cannot initialise security\n");
0991         goto error_security;
0992     }
0993 
0994     ret = register_pernet_device(&rxrpc_net_ops);
0995     if (ret)
0996         goto error_pernet;
0997 
0998     ret = proto_register(&rxrpc_proto, 1);
0999     if (ret < 0) {
1000         pr_crit("Cannot register protocol\n");
1001         goto error_proto;
1002     }
1003 
1004     ret = sock_register(&rxrpc_family_ops);
1005     if (ret < 0) {
1006         pr_crit("Cannot register socket family\n");
1007         goto error_sock;
1008     }
1009 
1010     ret = register_key_type(&key_type_rxrpc);
1011     if (ret < 0) {
1012         pr_crit("Cannot register client key type\n");
1013         goto error_key_type;
1014     }
1015 
1016     ret = register_key_type(&key_type_rxrpc_s);
1017     if (ret < 0) {
1018         pr_crit("Cannot register server key type\n");
1019         goto error_key_type_s;
1020     }
1021 
1022     ret = rxrpc_sysctl_init();
1023     if (ret < 0) {
1024         pr_crit("Cannot register sysctls\n");
1025         goto error_sysctls;
1026     }
1027 
1028     return 0;
1029 
1030 error_sysctls:
1031     unregister_key_type(&key_type_rxrpc_s);
1032 error_key_type_s:
1033     unregister_key_type(&key_type_rxrpc);
1034 error_key_type:
1035     sock_unregister(PF_RXRPC);
1036 error_sock:
1037     proto_unregister(&rxrpc_proto);
1038 error_proto:
1039     unregister_pernet_device(&rxrpc_net_ops);
1040 error_pernet:
1041     rxrpc_exit_security();
1042 error_security:
1043     destroy_workqueue(rxrpc_workqueue);
1044 error_work_queue:
1045     kmem_cache_destroy(rxrpc_call_jar);
1046 error_call_jar:
1047     return ret;
1048 }
1049 
1050 /*
1051  * unregister the RxRPC protocol
1052  */
1053 static void __exit af_rxrpc_exit(void)
1054 {
1055     _enter("");
1056     rxrpc_sysctl_exit();
1057     unregister_key_type(&key_type_rxrpc_s);
1058     unregister_key_type(&key_type_rxrpc);
1059     sock_unregister(PF_RXRPC);
1060     proto_unregister(&rxrpc_proto);
1061     unregister_pernet_device(&rxrpc_net_ops);
1062     ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
1063     ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
1064 
1065     /* Make sure the local and peer records pinned by any dying connections
1066      * are released.
1067      */
1068     rcu_barrier();
1069     rxrpc_destroy_client_conn_ids();
1070 
1071     destroy_workqueue(rxrpc_workqueue);
1072     rxrpc_exit_security();
1073     kmem_cache_destroy(rxrpc_call_jar);
1074     _leave("");
1075 }
1076 
1077 module_init(af_rxrpc_init);
1078 module_exit(af_rxrpc_exit);
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