/* * net/dccp/proto.c * * An implementation of the DCCP protocol * Arnaldo Carvalho de Melo * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ccid.h" #include "dccp.h" DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; EXPORT_SYMBOL_GPL(dccp_statistics); atomic_t dccp_orphan_count = ATOMIC_INIT(0); EXPORT_SYMBOL_GPL(dccp_orphan_count); static struct net_protocol dccp_protocol = { .handler = dccp_v4_rcv, .err_handler = dccp_v4_err, .no_policy = 1, }; const char *dccp_packet_name(const int type) { static const char *dccp_packet_names[] = { [DCCP_PKT_REQUEST] = "REQUEST", [DCCP_PKT_RESPONSE] = "RESPONSE", [DCCP_PKT_DATA] = "DATA", [DCCP_PKT_ACK] = "ACK", [DCCP_PKT_DATAACK] = "DATAACK", [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", [DCCP_PKT_CLOSE] = "CLOSE", [DCCP_PKT_RESET] = "RESET", [DCCP_PKT_SYNC] = "SYNC", [DCCP_PKT_SYNCACK] = "SYNCACK", }; if (type >= DCCP_NR_PKT_TYPES) return "INVALID"; else return dccp_packet_names[type]; } EXPORT_SYMBOL_GPL(dccp_packet_name); const char *dccp_state_name(const int state) { static char *dccp_state_names[] = { [DCCP_OPEN] = "OPEN", [DCCP_REQUESTING] = "REQUESTING", [DCCP_PARTOPEN] = "PARTOPEN", [DCCP_LISTEN] = "LISTEN", [DCCP_RESPOND] = "RESPOND", [DCCP_CLOSING] = "CLOSING", [DCCP_TIME_WAIT] = "TIME_WAIT", [DCCP_CLOSED] = "CLOSED", }; if (state >= DCCP_MAX_STATES) return "INVALID STATE!"; else return dccp_state_names[state]; } EXPORT_SYMBOL_GPL(dccp_state_name); static inline int dccp_listen_start(struct sock *sk) { struct dccp_sock *dp = dccp_sk(sk); dp->dccps_role = DCCP_ROLE_LISTEN; /* * Apps need to use setsockopt(DCCP_SOCKOPT_SERVICE) * before calling listen() */ if (dccp_service_not_initialized(sk)) return -EPROTO; return inet_csk_listen_start(sk, TCP_SYNQ_HSIZE); } int dccp_disconnect(struct sock *sk, int flags) { struct inet_connection_sock *icsk = inet_csk(sk); struct inet_sock *inet = inet_sk(sk); int err = 0; const int old_state = sk->sk_state; if (old_state != DCCP_CLOSED) dccp_set_state(sk, DCCP_CLOSED); /* ABORT function of RFC793 */ if (old_state == DCCP_LISTEN) { inet_csk_listen_stop(sk); /* FIXME: do the active reset thing */ } else if (old_state == DCCP_REQUESTING) sk->sk_err = ECONNRESET; dccp_clear_xmit_timers(sk); __skb_queue_purge(&sk->sk_receive_queue); if (sk->sk_send_head != NULL) { __kfree_skb(sk->sk_send_head); sk->sk_send_head = NULL; } inet->dport = 0; if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) inet_reset_saddr(sk); sk->sk_shutdown = 0; sock_reset_flag(sk, SOCK_DONE); icsk->icsk_backoff = 0; inet_csk_delack_init(sk); __sk_dst_reset(sk); BUG_TRAP(!inet->num || icsk->icsk_bind_hash); sk->sk_error_report(sk); return err; } EXPORT_SYMBOL_GPL(dccp_disconnect); /* * Wait for a DCCP event. * * Note that we don't need to lock the socket, as the upper poll layers * take care of normal races (between the test and the event) and we don't * go look at any of the socket buffers directly. */ unsigned int dccp_poll(struct file *file, struct socket *sock, poll_table *wait) { unsigned int mask; struct sock *sk = sock->sk; poll_wait(file, sk->sk_sleep, wait); if (sk->sk_state == DCCP_LISTEN) return inet_csk_listen_poll(sk); /* Socket is not locked. We are protected from async events by poll logic and correct handling of state changes made by another threads is impossible in any case. */ mask = 0; if (sk->sk_err) mask = POLLERR; if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) mask |= POLLHUP; if (sk->sk_shutdown & RCV_SHUTDOWN) mask |= POLLIN | POLLRDNORM; /* Connected? */ if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { if (atomic_read(&sk->sk_rmem_alloc) > 0) mask |= POLLIN | POLLRDNORM; if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { mask |= POLLOUT | POLLWRNORM; } else { /* send SIGIO later */ set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); /* Race breaker. If space is freed after * wspace test but before the flags are set, * IO signal will be lost. */ if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) mask |= POLLOUT | POLLWRNORM; } } } return mask; } EXPORT_SYMBOL_GPL(dccp_poll); int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) { dccp_pr_debug("entry\n"); return -ENOIOCTLCMD; } EXPORT_SYMBOL_GPL(dccp_ioctl); static int dccp_setsockopt_service(struct sock *sk, const u32 service, char __user *optval, int optlen) { struct dccp_sock *dp = dccp_sk(sk); struct dccp_service_list *sl = NULL; if (service == DCCP_SERVICE_INVALID_VALUE || optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) return -EINVAL; if (optlen > sizeof(service)) { sl = kmalloc(optlen, GFP_KERNEL); if (sl == NULL) return -ENOMEM; sl->dccpsl_nr = optlen / sizeof(u32) - 1; if (copy_from_user(sl->dccpsl_list, optval + sizeof(service), optlen - sizeof(service)) || dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { kfree(sl); return -EFAULT; } } lock_sock(sk); dp->dccps_service = service; kfree(dp->dccps_service_list); dp->dccps_service_list = sl; release_sock(sk); return 0; } int dccp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen) { struct dccp_sock *dp; int err; int val; if (level != SOL_DCCP) return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, optname, optval, optlen); if (optlen < sizeof(int)) return -EINVAL; if (get_user(val, (int __user *)optval)) return -EFAULT; if (optname == DCCP_SOCKOPT_SERVICE) return dccp_setsockopt_service(sk, val, optval, optlen); lock_sock(sk); dp = dccp_sk(sk); err = 0; switch (optname) { case DCCP_SOCKOPT_PACKET_SIZE: dp->dccps_packet_size = val; break; default: err = -ENOPROTOOPT; break; } release_sock(sk); return err; } EXPORT_SYMBOL_GPL(dccp_setsockopt); static int dccp_getsockopt_service(struct sock *sk, int len, u32 __user *optval, int __user *optlen) { const struct dccp_sock *dp = dccp_sk(sk); const struct dccp_service_list *sl; int err = -ENOENT, slen = 0, total_len = sizeof(u32); lock_sock(sk); if (dccp_service_not_initialized(sk)) goto out; if ((sl = dp->dccps_service_list) != NULL) { slen = sl->dccpsl_nr * sizeof(u32); total_len += slen; } err = -EINVAL; if (total_len > len) goto out; err = 0; if (put_user(total_len, optlen) || put_user(dp->dccps_service, optval) || (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) err = -EFAULT; out: release_sock(sk); return err; } int dccp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen) { struct dccp_sock *dp; int val, len; if (level != SOL_DCCP) return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, optname, optval, optlen); if (get_user(len, optlen)) return -EFAULT; if (len < sizeof(int)) return -EINVAL; dp = dccp_sk(sk); switch (optname) { case DCCP_SOCKOPT_PACKET_SIZE: val = dp->dccps_packet_size; len = sizeof(dp->dccps_packet_size); break; case DCCP_SOCKOPT_SERVICE: return dccp_getsockopt_service(sk, len, (u32 __user *)optval, optlen); case 128 ... 191: return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, len, (u32 __user *)optval, optlen); case 192 ... 255: return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, len, (u32 __user *)optval, optlen); default: return -ENOPROTOOPT; } if (put_user(len, optlen) || copy_to_user(optval, &val, len)) return -EFAULT; return 0; } EXPORT_SYMBOL_GPL(dccp_getsockopt); int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len) { const struct dccp_sock *dp = dccp_sk(sk); const int flags = msg->msg_flags; const int noblock = flags & MSG_DONTWAIT; struct sk_buff *skb; int rc, size; long timeo; if (len > dp->dccps_mss_cache) return -EMSGSIZE; lock_sock(sk); timeo = sock_sndtimeo(sk, noblock); /* * We have to use sk_stream_wait_connect here to set sk_write_pending, * so that the trick in dccp_rcv_request_sent_state_process. */ /* Wait for a connection to finish. */ if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN | DCCPF_CLOSING)) if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) goto out_release; size = sk->sk_prot->max_header + len; release_sock(sk); skb = sock_alloc_send_skb(sk, size, noblock, &rc); lock_sock(sk); if (skb == NULL) goto out_release; skb_reserve(skb, sk->sk_prot->max_header); rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); if (rc != 0) goto out_discard; rc = dccp_write_xmit(sk, skb, &timeo); /* * XXX we don't use sk_write_queue, so just discard the packet. * Current plan however is to _use_ sk_write_queue with * an algorith similar to tcp_sendmsg, where the main difference * is that in DCCP we have to respect packet boundaries, so * no coalescing of skbs. * * This bug was _quickly_ found & fixed by just looking at an OSTRA * generated callgraph 8) -acme */ out_release: release_sock(sk); return rc ? : len; out_discard: kfree_skb(skb); goto out_release; } EXPORT_SYMBOL_GPL(dccp_sendmsg); int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len, int nonblock, int flags, int *addr_len) { const struct dccp_hdr *dh; long timeo; lock_sock(sk); if (sk->sk_state == DCCP_LISTEN) { len = -ENOTCONN; goto out; } timeo = sock_rcvtimeo(sk, nonblock); do { struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); if (skb == NULL) goto verify_sock_status; dh = dccp_hdr(skb); if (dh->dccph_type == DCCP_PKT_DATA || dh->dccph_type == DCCP_PKT_DATAACK) goto found_ok_skb; if (dh->dccph_type == DCCP_PKT_RESET || dh->dccph_type == DCCP_PKT_CLOSE) { dccp_pr_debug("found fin ok!\n"); len = 0; goto found_fin_ok; } dccp_pr_debug("packet_type=%s\n", dccp_packet_name(dh->dccph_type)); sk_eat_skb(sk, skb); verify_sock_status: if (sock_flag(sk, SOCK_DONE)) { len = 0; break; } if (sk->sk_err) { len = sock_error(sk); break; } if (sk->sk_shutdown & RCV_SHUTDOWN) { len = 0; break; } if (sk->sk_state == DCCP_CLOSED) { if (!sock_flag(sk, SOCK_DONE)) { /* This occurs when user tries to read * from never connected socket. */ len = -ENOTCONN; break; } len = 0; break; } if (!timeo) { len = -EAGAIN; break; } if (signal_pending(current)) { len = sock_intr_errno(timeo); break; } sk_wait_data(sk, &timeo); continue; found_ok_skb: if (len > skb->len) len = skb->len; else if (len < skb->len) msg->msg_flags |= MSG_TRUNC; if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { /* Exception. Bailout! */ len = -EFAULT; break; } found_fin_ok: if (!(flags & MSG_PEEK)) sk_eat_skb(sk, skb); break; } while (1); out: release_sock(sk); return len; } EXPORT_SYMBOL_GPL(dccp_recvmsg); int inet_dccp_listen(struct socket *sock, int backlog) { struct sock *sk = sock->sk; unsigned char old_state; int err; lock_sock(sk); err = -EINVAL; if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) goto out; old_state = sk->sk_state; if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) goto out; /* Really, if the socket is already in listen state * we can only allow the backlog to be adjusted. */ if (old_state != DCCP_LISTEN) { /* * FIXME: here it probably should be sk->sk_prot->listen_start * see tcp_listen_start */ err = dccp_listen_start(sk); if (err) goto out; } sk->sk_max_ack_backlog = backlog; err = 0; out: release_sock(sk); return err; } EXPORT_SYMBOL_GPL(inet_dccp_listen); static const unsigned char dccp_new_state[] = { /* current state: new state: action: */ [0] = DCCP_CLOSED, [DCCP_OPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, [DCCP_REQUESTING] = DCCP_CLOSED, [DCCP_PARTOPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, [DCCP_LISTEN] = DCCP_CLOSED, [DCCP_RESPOND] = DCCP_CLOSED, [DCCP_CLOSING] = DCCP_CLOSED, [DCCP_TIME_WAIT] = DCCP_CLOSED, [DCCP_CLOSED] = DCCP_CLOSED, }; static int dccp_close_state(struct sock *sk) { const int next = dccp_new_state[sk->sk_state]; const int ns = next & DCCP_STATE_MASK; if (ns != sk->sk_state) dccp_set_state(sk, ns); return next & DCCP_ACTION_FIN; } void dccp_close(struct sock *sk, long timeout) { struct sk_buff *skb; lock_sock(sk); sk->sk_shutdown = SHUTDOWN_MASK; if (sk->sk_state == DCCP_LISTEN) { dccp_set_state(sk, DCCP_CLOSED); /* Special case. */ inet_csk_listen_stop(sk); goto adjudge_to_death; } /* * We need to flush the recv. buffs. We do this only on the * descriptor close, not protocol-sourced closes, because the *reader process may not have drained the data yet! */ /* FIXME: check for unread data */ while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { __kfree_skb(skb); } if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { /* Check zero linger _after_ checking for unread data. */ sk->sk_prot->disconnect(sk, 0); } else if (dccp_close_state(sk)) { dccp_send_close(sk, 1); } sk_stream_wait_close(sk, timeout); adjudge_to_death: /* * It is the last release_sock in its life. It will remove backlog. */ release_sock(sk); /* * Now socket is owned by kernel and we acquire BH lock * to finish close. No need to check for user refs. */ local_bh_disable(); bh_lock_sock(sk); BUG_TRAP(!sock_owned_by_user(sk)); sock_hold(sk); sock_orphan(sk); /* * The last release_sock may have processed the CLOSE or RESET * packet moving sock to CLOSED state, if not we have to fire * the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination" * in draft-ietf-dccp-spec-11. -acme */ if (sk->sk_state == DCCP_CLOSING) { /* FIXME: should start at 2 * RTT */ /* Timer for repeating the CLOSE/CLOSEREQ until an answer. */ inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); #if 0 /* Yeah, we should use sk->sk_prot->orphan_count, etc */ dccp_set_state(sk, DCCP_CLOSED); #endif } atomic_inc(sk->sk_prot->orphan_count); if (sk->sk_state == DCCP_CLOSED) inet_csk_destroy_sock(sk); /* Otherwise, socket is reprieved until protocol close. */ bh_unlock_sock(sk); local_bh_enable(); sock_put(sk); } EXPORT_SYMBOL_GPL(dccp_close); void dccp_shutdown(struct sock *sk, int how) { dccp_pr_debug("entry\n"); } EXPORT_SYMBOL_GPL(dccp_shutdown); static const struct proto_ops inet_dccp_ops = { .family = PF_INET, .owner = THIS_MODULE, .release = inet_release, .bind = inet_bind, .connect = inet_stream_connect, .socketpair = sock_no_socketpair, .accept = inet_accept, .getname = inet_getname, /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ .poll = dccp_poll, .ioctl = inet_ioctl, /* FIXME: work on inet_listen to rename it to sock_common_listen */ .listen = inet_dccp_listen, .shutdown = inet_shutdown, .setsockopt = sock_common_setsockopt, .getsockopt = sock_common_getsockopt, .sendmsg = inet_sendmsg, .recvmsg = sock_common_recvmsg, .mmap = sock_no_mmap, .sendpage = sock_no_sendpage, }; extern struct net_proto_family inet_family_ops; static struct inet_protosw dccp_v4_protosw = { .type = SOCK_DCCP, .protocol = IPPROTO_DCCP, .prot = &dccp_prot, .ops = &inet_dccp_ops, .capability = -1, .no_check = 0, .flags = INET_PROTOSW_ICSK, }; /* * This is the global socket data structure used for responding to * the Out-of-the-blue (OOTB) packets. A control sock will be created * for this socket at the initialization time. */ struct socket *dccp_ctl_socket; static char dccp_ctl_socket_err_msg[] __initdata = KERN_ERR "DCCP: Failed to create the control socket.\n"; static int __init dccp_ctl_sock_init(void) { int rc = sock_create_kern(PF_INET, SOCK_DCCP, IPPROTO_DCCP, &dccp_ctl_socket); if (rc < 0) printk(dccp_ctl_socket_err_msg); else { dccp_ctl_socket->sk->sk_allocation = GFP_ATOMIC; inet_sk(dccp_ctl_socket->sk)->uc_ttl = -1; /* Unhash it so that IP input processing does not even * see it, we do not wish this socket to see incoming * packets. */ dccp_ctl_socket->sk->sk_prot->unhash(dccp_ctl_socket->sk); } return rc; } #ifdef CONFIG_IP_DCCP_UNLOAD_HACK void dccp_ctl_sock_exit(void) { if (dccp_ctl_socket != NULL) { sock_release(dccp_ctl_socket); dccp_ctl_socket = NULL; } } EXPORT_SYMBOL_GPL(dccp_ctl_sock_exit); #endif static int __init init_dccp_v4_mibs(void) { int rc = -ENOMEM; dccp_statistics[0] = alloc_percpu(struct dccp_mib); if (dccp_statistics[0] == NULL) goto out; dccp_statistics[1] = alloc_percpu(struct dccp_mib); if (dccp_statistics[1] == NULL) goto out_free_one; rc = 0; out: return rc; out_free_one: free_percpu(dccp_statistics[0]); dccp_statistics[0] = NULL; goto out; } static int thash_entries; module_param(thash_entries, int, 0444); MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); #ifdef CONFIG_IP_DCCP_DEBUG int dccp_debug; module_param(dccp_debug, int, 0444); MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); EXPORT_SYMBOL_GPL(dccp_debug); #endif static int __init dccp_init(void) { unsigned long goal; int ehash_order, bhash_order, i; int rc = proto_register(&dccp_prot, 1); if (rc) goto out; dccp_hashinfo.bind_bucket_cachep = kmem_cache_create("dccp_bind_bucket", sizeof(struct inet_bind_bucket), 0, SLAB_HWCACHE_ALIGN, NULL, NULL); if (!dccp_hashinfo.bind_bucket_cachep) goto out_proto_unregister; /* * Size and allocate the main established and bind bucket * hash tables. * * The methodology is similar to that of the buffer cache. */ if (num_physpages >= (128 * 1024)) goal = num_physpages >> (21 - PAGE_SHIFT); else goal = num_physpages >> (23 - PAGE_SHIFT); if (thash_entries) goal = (thash_entries * sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) ; do { dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / sizeof(struct inet_ehash_bucket); dccp_hashinfo.ehash_size >>= 1; while (dccp_hashinfo.ehash_size & (dccp_hashinfo.ehash_size - 1)) dccp_hashinfo.ehash_size--; dccp_hashinfo.ehash = (struct inet_ehash_bucket *) __get_free_pages(GFP_ATOMIC, ehash_order); } while (!dccp_hashinfo.ehash && --ehash_order > 0); if (!dccp_hashinfo.ehash) { printk(KERN_CRIT "Failed to allocate DCCP " "established hash table\n"); goto out_free_bind_bucket_cachep; } for (i = 0; i < (dccp_hashinfo.ehash_size << 1); i++) { rwlock_init(&dccp_hashinfo.ehash[i].lock); INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); } bhash_order = ehash_order; do { dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / sizeof(struct inet_bind_hashbucket); if ((dccp_hashinfo.bhash_size > (64 * 1024)) && bhash_order > 0) continue; dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) __get_free_pages(GFP_ATOMIC, bhash_order); } while (!dccp_hashinfo.bhash && --bhash_order >= 0); if (!dccp_hashinfo.bhash) { printk(KERN_CRIT "Failed to allocate DCCP bind hash table\n"); goto out_free_dccp_ehash; } for (i = 0; i < dccp_hashinfo.bhash_size; i++) { spin_lock_init(&dccp_hashinfo.bhash[i].lock); INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); } if (init_dccp_v4_mibs()) goto out_free_dccp_bhash; rc = -EAGAIN; if (inet_add_protocol(&dccp_protocol, IPPROTO_DCCP)) goto out_free_dccp_v4_mibs; inet_register_protosw(&dccp_v4_protosw); rc = dccp_ctl_sock_init(); if (rc) goto out_unregister_protosw; out: return rc; out_unregister_protosw: inet_unregister_protosw(&dccp_v4_protosw); inet_del_protocol(&dccp_protocol, IPPROTO_DCCP); out_free_dccp_v4_mibs: free_percpu(dccp_statistics[0]); free_percpu(dccp_statistics[1]); dccp_statistics[0] = dccp_statistics[1] = NULL; out_free_dccp_bhash: free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); dccp_hashinfo.bhash = NULL; out_free_dccp_ehash: free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); dccp_hashinfo.ehash = NULL; out_free_bind_bucket_cachep: kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); dccp_hashinfo.bind_bucket_cachep = NULL; out_proto_unregister: proto_unregister(&dccp_prot); goto out; } static const char dccp_del_proto_err_msg[] __exitdata = KERN_ERR "can't remove dccp net_protocol\n"; static void __exit dccp_fini(void) { inet_unregister_protosw(&dccp_v4_protosw); if (inet_del_protocol(&dccp_protocol, IPPROTO_DCCP) < 0) printk(dccp_del_proto_err_msg); free_percpu(dccp_statistics[0]); free_percpu(dccp_statistics[1]); free_pages((unsigned long)dccp_hashinfo.bhash, get_order(dccp_hashinfo.bhash_size * sizeof(struct inet_bind_hashbucket))); free_pages((unsigned long)dccp_hashinfo.ehash, get_order(dccp_hashinfo.ehash_size * sizeof(struct inet_ehash_bucket))); kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); proto_unregister(&dccp_prot); } module_init(dccp_init); module_exit(dccp_fini); /* * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) * values directly, Also cover the case where the protocol is not specified, * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP */ MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-33-type-6"); MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-0-type-6"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Arnaldo Carvalho de Melo "); MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol");