| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * IUCV protocol stack for Linux on zSeries |
| * |
| * Copyright IBM Corp. 2006, 2009 |
| * |
| * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> |
| * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> |
| * PM functions: |
| * Ursula Braun <ursula.braun@de.ibm.com> |
| */ |
| |
| #define KMSG_COMPONENT "af_iucv" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/netdevice.h> |
| #include <linux/types.h> |
| #include <linux/limits.h> |
| #include <linux/list.h> |
| #include <linux/errno.h> |
| #include <linux/kernel.h> |
| #include <linux/sched/signal.h> |
| #include <linux/slab.h> |
| #include <linux/skbuff.h> |
| #include <linux/init.h> |
| #include <linux/poll.h> |
| #include <linux/security.h> |
| #include <net/sock.h> |
| #include <asm/ebcdic.h> |
| #include <asm/cpcmd.h> |
| #include <linux/kmod.h> |
| |
| #include <net/iucv/af_iucv.h> |
| |
| #define VERSION "1.2" |
| |
| static char iucv_userid[80]; |
| |
| static struct proto iucv_proto = { |
| .name = "AF_IUCV", |
| .owner = THIS_MODULE, |
| .obj_size = sizeof(struct iucv_sock), |
| }; |
| |
| static struct iucv_interface *pr_iucv; |
| static struct iucv_handler af_iucv_handler; |
| |
| /* special AF_IUCV IPRM messages */ |
| static const u8 iprm_shutdown[8] = |
| {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; |
| |
| #define TRGCLS_SIZE sizeof_field(struct iucv_message, class) |
| |
| #define __iucv_sock_wait(sk, condition, timeo, ret) \ |
| do { \ |
| DEFINE_WAIT(__wait); \ |
| long __timeo = timeo; \ |
| ret = 0; \ |
| prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ |
| while (!(condition)) { \ |
| if (!__timeo) { \ |
| ret = -EAGAIN; \ |
| break; \ |
| } \ |
| if (signal_pending(current)) { \ |
| ret = sock_intr_errno(__timeo); \ |
| break; \ |
| } \ |
| release_sock(sk); \ |
| __timeo = schedule_timeout(__timeo); \ |
| lock_sock(sk); \ |
| ret = sock_error(sk); \ |
| if (ret) \ |
| break; \ |
| } \ |
| finish_wait(sk_sleep(sk), &__wait); \ |
| } while (0) |
| |
| #define iucv_sock_wait(sk, condition, timeo) \ |
| ({ \ |
| int __ret = 0; \ |
| if (!(condition)) \ |
| __iucv_sock_wait(sk, condition, timeo, __ret); \ |
| __ret; \ |
| }) |
| |
| static struct sock *iucv_accept_dequeue(struct sock *parent, |
| struct socket *newsock); |
| static void iucv_sock_kill(struct sock *sk); |
| static void iucv_sock_close(struct sock *sk); |
| |
| static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify); |
| |
| static struct iucv_sock_list iucv_sk_list = { |
| .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
| .autobind_name = ATOMIC_INIT(0) |
| }; |
| |
| static inline void high_nmcpy(unsigned char *dst, char *src) |
| { |
| memcpy(dst, src, 8); |
| } |
| |
| static inline void low_nmcpy(unsigned char *dst, char *src) |
| { |
| memcpy(&dst[8], src, 8); |
| } |
| |
| /** |
| * iucv_msg_length() - Returns the length of an iucv message. |
| * @msg: Pointer to struct iucv_message, MUST NOT be NULL |
| * |
| * The function returns the length of the specified iucv message @msg of data |
| * stored in a buffer and of data stored in the parameter list (PRMDATA). |
| * |
| * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket |
| * data: |
| * PRMDATA[0..6] socket data (max 7 bytes); |
| * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) |
| * |
| * The socket data length is computed by subtracting the socket data length |
| * value from 0xFF. |
| * If the socket data len is greater 7, then PRMDATA can be used for special |
| * notifications (see iucv_sock_shutdown); and further, |
| * if the socket data len is > 7, the function returns 8. |
| * |
| * Use this function to allocate socket buffers to store iucv message data. |
| */ |
| static inline size_t iucv_msg_length(struct iucv_message *msg) |
| { |
| size_t datalen; |
| |
| if (msg->flags & IUCV_IPRMDATA) { |
| datalen = 0xff - msg->rmmsg[7]; |
| return (datalen < 8) ? datalen : 8; |
| } |
| return msg->length; |
| } |
| |
| /** |
| * iucv_sock_in_state() - check for specific states |
| * @sk: sock structure |
| * @state: first iucv sk state |
| * @state2: second iucv sk state |
| * |
| * Returns true if the socket in either in the first or second state. |
| */ |
| static int iucv_sock_in_state(struct sock *sk, int state, int state2) |
| { |
| return (sk->sk_state == state || sk->sk_state == state2); |
| } |
| |
| /** |
| * iucv_below_msglim() - function to check if messages can be sent |
| * @sk: sock structure |
| * |
| * Returns true if the send queue length is lower than the message limit. |
| * Always returns true if the socket is not connected (no iucv path for |
| * checking the message limit). |
| */ |
| static inline int iucv_below_msglim(struct sock *sk) |
| { |
| struct iucv_sock *iucv = iucv_sk(sk); |
| |
| if (sk->sk_state != IUCV_CONNECTED) |
| return 1; |
| if (iucv->transport == AF_IUCV_TRANS_IUCV) |
| return (atomic_read(&iucv->skbs_in_xmit) < iucv->path->msglim); |
| else |
| return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && |
| (atomic_read(&iucv->pendings) <= 0)); |
| } |
| |
| /* |
| * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit |
| */ |
| static void iucv_sock_wake_msglim(struct sock *sk) |
| { |
| struct socket_wq *wq; |
| |
| rcu_read_lock(); |
| wq = rcu_dereference(sk->sk_wq); |
| if (skwq_has_sleeper(wq)) |
| wake_up_interruptible_all(&wq->wait); |
| sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
| rcu_read_unlock(); |
| } |
| |
| /* |
| * afiucv_hs_send() - send a message through HiperSockets transport |
| */ |
| static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, |
| struct sk_buff *skb, u8 flags) |
| { |
| struct iucv_sock *iucv = iucv_sk(sock); |
| struct af_iucv_trans_hdr *phs_hdr; |
| int err, confirm_recv = 0; |
| |
| phs_hdr = skb_push(skb, sizeof(*phs_hdr)); |
| memset(phs_hdr, 0, sizeof(*phs_hdr)); |
| skb_reset_network_header(skb); |
| |
| phs_hdr->magic = ETH_P_AF_IUCV; |
| phs_hdr->version = 1; |
| phs_hdr->flags = flags; |
| if (flags == AF_IUCV_FLAG_SYN) |
| phs_hdr->window = iucv->msglimit; |
| else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { |
| confirm_recv = atomic_read(&iucv->msg_recv); |
| phs_hdr->window = confirm_recv; |
| if (confirm_recv) |
| phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; |
| } |
| memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); |
| memcpy(phs_hdr->destAppName, iucv->dst_name, 8); |
| memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); |
| memcpy(phs_hdr->srcAppName, iucv->src_name, 8); |
| ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); |
| ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); |
| ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); |
| ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); |
| if (imsg) |
| memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); |
| |
| skb->dev = iucv->hs_dev; |
| if (!skb->dev) { |
| err = -ENODEV; |
| goto err_free; |
| } |
| |
| dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len); |
| |
| if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) { |
| err = -ENETDOWN; |
| goto err_free; |
| } |
| if (skb->len > skb->dev->mtu) { |
| if (sock->sk_type == SOCK_SEQPACKET) { |
| err = -EMSGSIZE; |
| goto err_free; |
| } |
| err = pskb_trim(skb, skb->dev->mtu); |
| if (err) |
| goto err_free; |
| } |
| skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); |
| |
| atomic_inc(&iucv->skbs_in_xmit); |
| err = dev_queue_xmit(skb); |
| if (net_xmit_eval(err)) { |
| atomic_dec(&iucv->skbs_in_xmit); |
| } else { |
| atomic_sub(confirm_recv, &iucv->msg_recv); |
| WARN_ON(atomic_read(&iucv->msg_recv) < 0); |
| } |
| return net_xmit_eval(err); |
| |
| err_free: |
| kfree_skb(skb); |
| return err; |
| } |
| |
| static struct sock *__iucv_get_sock_by_name(char *nm) |
| { |
| struct sock *sk; |
| |
| sk_for_each(sk, &iucv_sk_list.head) |
| if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) |
| return sk; |
| |
| return NULL; |
| } |
| |
| static void iucv_sock_destruct(struct sock *sk) |
| { |
| skb_queue_purge(&sk->sk_receive_queue); |
| skb_queue_purge(&sk->sk_error_queue); |
| |
| sk_mem_reclaim(sk); |
| |
| if (!sock_flag(sk, SOCK_DEAD)) { |
| pr_err("Attempt to release alive iucv socket %p\n", sk); |
| return; |
| } |
| |
| WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| WARN_ON(refcount_read(&sk->sk_wmem_alloc)); |
| WARN_ON(sk->sk_wmem_queued); |
| WARN_ON(sk->sk_forward_alloc); |
| } |
| |
| /* Cleanup Listen */ |
| static void iucv_sock_cleanup_listen(struct sock *parent) |
| { |
| struct sock *sk; |
| |
| /* Close non-accepted connections */ |
| while ((sk = iucv_accept_dequeue(parent, NULL))) { |
| iucv_sock_close(sk); |
| iucv_sock_kill(sk); |
| } |
| |
| parent->sk_state = IUCV_CLOSED; |
| } |
| |
| static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) |
| { |
| write_lock_bh(&l->lock); |
| sk_add_node(sk, &l->head); |
| write_unlock_bh(&l->lock); |
| } |
| |
| static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) |
| { |
| write_lock_bh(&l->lock); |
| sk_del_node_init(sk); |
| write_unlock_bh(&l->lock); |
| } |
| |
| /* Kill socket (only if zapped and orphaned) */ |
| static void iucv_sock_kill(struct sock *sk) |
| { |
| if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) |
| return; |
| |
| iucv_sock_unlink(&iucv_sk_list, sk); |
| sock_set_flag(sk, SOCK_DEAD); |
| sock_put(sk); |
| } |
| |
| /* Terminate an IUCV path */ |
| static void iucv_sever_path(struct sock *sk, int with_user_data) |
| { |
| unsigned char user_data[16]; |
| struct iucv_sock *iucv = iucv_sk(sk); |
| struct iucv_path *path = iucv->path; |
| |
| if (iucv->path) { |
| iucv->path = NULL; |
| if (with_user_data) { |
| low_nmcpy(user_data, iucv->src_name); |
| high_nmcpy(user_data, iucv->dst_name); |
| ASCEBC(user_data, sizeof(user_data)); |
| pr_iucv->path_sever(path, user_data); |
| } else |
| pr_iucv->path_sever(path, NULL); |
| iucv_path_free(path); |
| } |
| } |
| |
| /* Send controlling flags through an IUCV socket for HIPER transport */ |
| static int iucv_send_ctrl(struct sock *sk, u8 flags) |
| { |
| struct iucv_sock *iucv = iucv_sk(sk); |
| int err = 0; |
| int blen; |
| struct sk_buff *skb; |
| u8 shutdown = 0; |
| |
| blen = sizeof(struct af_iucv_trans_hdr) + |
| LL_RESERVED_SPACE(iucv->hs_dev); |
| if (sk->sk_shutdown & SEND_SHUTDOWN) { |
| /* controlling flags should be sent anyway */ |
| shutdown = sk->sk_shutdown; |
| sk->sk_shutdown &= RCV_SHUTDOWN; |
| } |
| skb = sock_alloc_send_skb(sk, blen, 1, &err); |
| if (skb) { |
| skb_reserve(skb, blen); |
| err = afiucv_hs_send(NULL, sk, skb, flags); |
| } |
| if (shutdown) |
| sk->sk_shutdown = shutdown; |
| return err; |
| } |
| |
| /* Close an IUCV socket */ |
| static void iucv_sock_close(struct sock *sk) |
| { |
| struct iucv_sock *iucv = iucv_sk(sk); |
| unsigned long timeo; |
| int err = 0; |
| |
| lock_sock(sk); |
| |
| switch (sk->sk_state) { |
| case IUCV_LISTEN: |
| iucv_sock_cleanup_listen(sk); |
| break; |
| |
| case IUCV_CONNECTED: |
| if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
| err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); |
| sk->sk_state = IUCV_DISCONN; |
| sk->sk_state_change(sk); |
| } |
| fallthrough; |
| |
| case IUCV_DISCONN: |
| sk->sk_state = IUCV_CLOSING; |
| sk->sk_state_change(sk); |
| |
| if (!err && atomic_read(&iucv->skbs_in_xmit) > 0) { |
| if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
| timeo = sk->sk_lingertime; |
| else |
| timeo = IUCV_DISCONN_TIMEOUT; |
| iucv_sock_wait(sk, |
| iucv_sock_in_state(sk, IUCV_CLOSED, 0), |
| timeo); |
| } |
| fallthrough; |
| |
| case IUCV_CLOSING: |
| sk->sk_state = IUCV_CLOSED; |
| sk->sk_state_change(sk); |
| |
| sk->sk_err = ECONNRESET; |
| sk->sk_state_change(sk); |
| |
| skb_queue_purge(&iucv->send_skb_q); |
| skb_queue_purge(&iucv->backlog_skb_q); |
| fallthrough; |
| |
| default: |
| iucv_sever_path(sk, 1); |
| } |
| |
| if (iucv->hs_dev) { |
| dev_put(iucv->hs_dev); |
| iucv->hs_dev = NULL; |
| sk->sk_bound_dev_if = 0; |
| } |
| |
| /* mark socket for deletion by iucv_sock_kill() */ |
| sock_set_flag(sk, SOCK_ZAPPED); |
| |
| release_sock(sk); |
| } |
| |
| static void iucv_sock_init(struct sock *sk, struct sock *parent) |
| { |
| if (parent) { |
| sk->sk_type = parent->sk_type; |
| security_sk_clone(parent, sk); |
| } |
| } |
| |
| static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) |
| { |
| struct sock *sk; |
| struct iucv_sock *iucv; |
| |
| sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); |
| if (!sk) |
| return NULL; |
| iucv = iucv_sk(sk); |
| |
| sock_init_data(sock, sk); |
| INIT_LIST_HEAD(&iucv->accept_q); |
| spin_lock_init(&iucv->accept_q_lock); |
| skb_queue_head_init(&iucv->send_skb_q); |
| INIT_LIST_HEAD(&iucv->message_q.list); |
| spin_lock_init(&iucv->message_q.lock); |
| skb_queue_head_init(&iucv->backlog_skb_q); |
| iucv->send_tag = 0; |
| atomic_set(&iucv->pendings, 0); |
| iucv->flags = 0; |
| iucv->msglimit = 0; |
| atomic_set(&iucv->skbs_in_xmit, 0); |
| atomic_set(&iucv->msg_sent, 0); |
| atomic_set(&iucv->msg_recv, 0); |
| iucv->path = NULL; |
| iucv->sk_txnotify = afiucv_hs_callback_txnotify; |
| memset(&iucv->init, 0, sizeof(iucv->init)); |
| if (pr_iucv) |
| iucv->transport = AF_IUCV_TRANS_IUCV; |
| else |
| iucv->transport = AF_IUCV_TRANS_HIPER; |
| |
| sk->sk_destruct = iucv_sock_destruct; |
| sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; |
| |
| sock_reset_flag(sk, SOCK_ZAPPED); |
| |
| sk->sk_protocol = proto; |
| sk->sk_state = IUCV_OPEN; |
| |
| iucv_sock_link(&iucv_sk_list, sk); |
| return sk; |
| } |
| |
| static void iucv_accept_enqueue(struct sock *parent, struct sock *sk) |
| { |
| unsigned long flags; |
| struct iucv_sock *par = iucv_sk(parent); |
| |
| sock_hold(sk); |
| spin_lock_irqsave(&par->accept_q_lock, flags); |
| list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); |
| spin_unlock_irqrestore(&par->accept_q_lock, flags); |
| iucv_sk(sk)->parent = parent; |
| sk_acceptq_added(parent); |
| } |
| |
| static void iucv_accept_unlink(struct sock *sk) |
| { |
| unsigned long flags; |
| struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); |
| |
| spin_lock_irqsave(&par->accept_q_lock, flags); |
| list_del_init(&iucv_sk(sk)->accept_q); |
| spin_unlock_irqrestore(&par->accept_q_lock, flags); |
| sk_acceptq_removed(iucv_sk(sk)->parent); |
| iucv_sk(sk)->parent = NULL; |
| sock_put(sk); |
| } |
| |
| static struct sock *iucv_accept_dequeue(struct sock *parent, |
| struct socket *newsock) |
| { |
| struct iucv_sock *isk, *n; |
| struct sock *sk; |
| |
| list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
| sk = (struct sock *) isk; |
| lock_sock(sk); |
| |
| if (sk->sk_state == IUCV_CLOSED) { |
| iucv_accept_unlink(sk); |
| release_sock(sk); |
| continue; |
| } |
| |
| if (sk->sk_state == IUCV_CONNECTED || |
| sk->sk_state == IUCV_DISCONN || |
| !newsock) { |
| iucv_accept_unlink(sk); |
| if (newsock) |
| sock_graft(sk, newsock); |
| |
| release_sock(sk); |
| return sk; |
| } |
| |
| release_sock(sk); |
| } |
| return NULL; |
| } |
| |
| static void __iucv_auto_name(struct iucv_sock *iucv) |
| { |
| char name[12]; |
| |
| sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); |
| while (__iucv_get_sock_by_name(name)) { |
| sprintf(name, "%08x", |
| atomic_inc_return(&iucv_sk_list.autobind_name)); |
| } |
| memcpy(iucv->src_name, name, 8); |
| } |
| |
| /* Bind an unbound socket */ |
| static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, |
| int addr_len) |
| { |
| DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); |
| char uid[sizeof(sa->siucv_user_id)]; |
| struct sock *sk = sock->sk; |
| struct iucv_sock *iucv; |
| int err = 0; |
| struct net_device *dev; |
| |
| /* Verify the input sockaddr */ |
| if (addr_len < sizeof(struct sockaddr_iucv) || |
| addr->sa_family != AF_IUCV) |
| return -EINVAL; |
| |
| lock_sock(sk); |
| if (sk->sk_state != IUCV_OPEN) { |
| err = -EBADFD; |
| goto done; |
| } |
| |
| write_lock_bh(&iucv_sk_list.lock); |
| |
| iucv = iucv_sk(sk); |
| if (__iucv_get_sock_by_name(sa->siucv_name)) { |
| err = -EADDRINUSE; |
| goto done_unlock; |
| } |
| if (iucv->path) |
| goto done_unlock; |
| |
| /* Bind the socket */ |
| if (pr_iucv) |
| if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) |
| goto vm_bind; /* VM IUCV transport */ |
| |
| /* try hiper transport */ |
| memcpy(uid, sa->siucv_user_id, sizeof(uid)); |
| ASCEBC(uid, 8); |
| rcu_read_lock(); |
| for_each_netdev_rcu(&init_net, dev) { |
| if (!memcmp(dev->perm_addr, uid, 8)) { |
| memcpy(iucv->src_user_id, sa->siucv_user_id, 8); |
| /* Check for uninitialized siucv_name */ |
| if (strncmp(sa->siucv_name, " ", 8) == 0) |
| __iucv_auto_name(iucv); |
| else |
| memcpy(iucv->src_name, sa->siucv_name, 8); |
| sk->sk_bound_dev_if = dev->ifindex; |
| iucv->hs_dev = dev; |
| dev_hold(dev); |
| sk->sk_state = IUCV_BOUND; |
| iucv->transport = AF_IUCV_TRANS_HIPER; |
| if (!iucv->msglimit) |
| iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; |
| rcu_read_unlock(); |
| goto done_unlock; |
| } |
| } |
| rcu_read_unlock(); |
| vm_bind: |
| if (pr_iucv) { |
| /* use local userid for backward compat */ |
| memcpy(iucv->src_name, sa->siucv_name, 8); |
| memcpy(iucv->src_user_id, iucv_userid, 8); |
| sk->sk_state = IUCV_BOUND; |
| iucv->transport = AF_IUCV_TRANS_IUCV; |
| sk->sk_allocation |= GFP_DMA; |
| if (!iucv->msglimit) |
| iucv->msglimit = IUCV_QUEUELEN_DEFAULT; |
| goto done_unlock; |
| } |
| /* found no dev to bind */ |
| err = -ENODEV; |
| done_unlock: |
| /* Release the socket list lock */ |
| write_unlock_bh(&iucv_sk_list.lock); |
| done: |
| release_sock(sk); |
| return err; |
| } |
| |
| /* Automatically bind an unbound socket */ |
| static int iucv_sock_autobind(struct sock *sk) |
| { |
| struct iucv_sock *iucv = iucv_sk(sk); |
| int err = 0; |
| |
| if (unlikely(!pr_iucv)) |
| return -EPROTO; |
| |
| memcpy(iucv->src_user_id, iucv_userid, 8); |
| iucv->transport = AF_IUCV_TRANS_IUCV; |
| sk->sk_allocation |= GFP_DMA; |
| |
| write_lock_bh(&iucv_sk_list.lock); |
| __iucv_auto_name(iucv); |
| write_unlock_bh(&iucv_sk_list.lock); |
| |
| if (!iucv->msglimit) |
| iucv->msglimit = IUCV_QUEUELEN_DEFAULT; |
| |
| return err; |
| } |
| |
| static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) |
| { |
| DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); |
| struct sock *sk = sock->sk; |
| struct iucv_sock *iucv = iucv_sk(sk); |
| unsigned char user_data[16]; |
| int err; |
| |
| high_nmcpy(user_data, sa->siucv_name); |
| low_nmcpy(user_data, iucv->src_name); |
| ASCEBC(user_data, sizeof(user_data)); |
| |
| /* Create path. */ |
| iucv->path = iucv_path_alloc(iucv->msglimit, |
| IUCV_IPRMDATA, GFP_KERNEL); |
| if (!iucv->path) { |
| err = -ENOMEM; |
| goto done; |
| } |
| err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, |
| sa->siucv_user_id, NULL, user_data, |
| sk); |
| if (err) { |
| iucv_path_free(iucv->path); |
| iucv->path = NULL; |
| switch (err) { |
| case 0x0b: /* Target communicator is not logged on */ |
| err = -ENETUNREACH; |
| break; |
| case 0x0d: /* Max connections for this guest exceeded */ |
| case 0x0e: /* Max connections for target guest exceeded */ |
| err = -EAGAIN; |
| break; |
| case 0x0f: /* Missing IUCV authorization */ |
| err = -EACCES; |
| break; |
| default: |
| err = -ECONNREFUSED; |
| break; |
| } |
| } |
| done: |
| return err; |
| } |
| |
| /* Connect an unconnected socket */ |
| static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, |
| int alen, int flags) |
| { |
| DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); |
| struct sock *sk = sock->sk; |
| struct iucv_sock *iucv = iucv_sk(sk); |
| int err; |
| |
| if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV) |
| return -EINVAL; |
| |
| if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) |
| return -EBADFD; |
| |
| if (sk->sk_state == IUCV_OPEN && |
| iucv->transport == AF_IUCV_TRANS_HIPER) |
| return -EBADFD; /* explicit bind required */ |
| |
| if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) |
| return -EINVAL; |
| |
| if (sk->sk_state == IUCV_OPEN) { |
| err = iucv_sock_autobind(sk); |
| if (unlikely(err)) |
| return err; |
| } |
| |
| lock_sock(sk); |
| |
| /* Set the destination information */ |
| memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); |
| memcpy(iucv->dst_name, sa->siucv_name, 8); |
| |
| if (iucv->transport == AF_IUCV_TRANS_HIPER) |
| err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); |
| else |
| err = afiucv_path_connect(sock, addr); |
| if (err) |
| goto done; |
| |
| if (sk->sk_state != IUCV_CONNECTED) |
| err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
| IUCV_DISCONN), |
| sock_sndtimeo(sk, flags & O_NONBLOCK)); |
| |
| if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) |
| err = -ECONNREFUSED; |
| |
| if (err && iucv->transport == AF_IUCV_TRANS_IUCV) |
| iucv_sever_path(sk, 0); |
| |
| done: |
| release_sock(sk); |
| return err; |
| } |
| |
| /* Move a socket into listening state. */ |
| static int iucv_sock_listen(struct socket *sock, int backlog) |
| { |
| struct sock *sk = sock->sk; |
| int err; |
| |
| lock_sock(sk); |
| |
| err = -EINVAL; |
| if (sk->sk_state != IUCV_BOUND) |
| goto done; |
| |
| if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
| goto done; |
| |
| sk->sk_max_ack_backlog = backlog; |
| sk->sk_ack_backlog = 0; |
| sk->sk_state = IUCV_LISTEN; |
| err = 0; |
| |
| done: |
| release_sock(sk); |
| return err; |
| } |
| |
| /* Accept a pending connection */ |
| static int iucv_sock_accept(struct socket *sock, struct socket *newsock, |
| int flags, bool kern) |
| { |
| DECLARE_WAITQUEUE(wait, current); |
| struct sock *sk = sock->sk, *nsk; |
| long timeo; |
| int err = 0; |
| |
| lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
| |
| if (sk->sk_state != IUCV_LISTEN) { |
| err = -EBADFD; |
| goto done; |
| } |
| |
| timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
| |
| /* Wait for an incoming connection */ |
| add_wait_queue_exclusive(sk_sleep(sk), &wait); |
| while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
| set_current_state(TASK_INTERRUPTIBLE); |
| if (!timeo) { |
| err = -EAGAIN; |
| break; |
| } |
| |
| release_sock(sk); |
| timeo = schedule_timeout(timeo); |
| lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
| |
| if (sk->sk_state != IUCV_LISTEN) { |
| err = -EBADFD; |
| break; |
| } |
| |
| if (signal_pending(current)) { |
| err = sock_intr_errno(timeo); |
| break; |
| } |
| } |
| |
| set_current_state(TASK_RUNNING); |
| remove_wait_queue(sk_sleep(sk), &wait); |
| |
| if (err) |
| goto done; |
| |
| newsock->state = SS_CONNECTED; |
| |
| done: |
| release_sock(sk); |
| return err; |
| } |
| |
| static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, |
| int peer) |
| { |
| DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr); |
| struct sock *sk = sock->sk; |
| struct iucv_sock *iucv = iucv_sk(sk); |
| |
| addr->sa_family = AF_IUCV; |
| |
| if (peer) { |
| memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); |
| memcpy(siucv->siucv_name, iucv->dst_name, 8); |
| } else { |
| memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); |
| memcpy(siucv->siucv_name, iucv->src_name, 8); |
| } |
| memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); |
| memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); |
| memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); |
| |
| return sizeof(struct sockaddr_iucv); |
| } |
| |
| /** |
| * iucv_send_iprm() - Send socket data in parameter list of an iucv message. |
| * @path: IUCV path |
| * @msg: Pointer to a struct iucv_message |
| * @skb: The socket data to send, skb->len MUST BE <= 7 |
| * |
| * Send the socket data in the parameter list in the iucv message |
| * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter |
| * list and the socket data len at index 7 (last byte). |
| * See also iucv_msg_length(). |
| * |
| * Returns the error code from the iucv_message_send() call. |
| */ |
| static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, |
| struct sk_buff *skb) |
| { |
| u8 prmdata[8]; |
| |
| memcpy(prmdata, (void *) skb->data, skb->len); |
| prmdata[7] = 0xff - (u8) skb->len; |
| return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, |
| (void *) prmdata, 8); |
| } |
| |
| static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, |
| size_t len) |
| { |
| struct sock *sk = sock->sk; |
| struct iucv_sock *iucv = iucv_sk(sk); |
| size_t headroom = 0; |
| size_t linear; |
| struct sk_buff *skb; |
| struct iucv_message txmsg = {0}; |
| struct cmsghdr *cmsg; |
| int cmsg_done; |
| long timeo; |
| char user_id[9]; |
| char appl_id[9]; |
| int err; |
| int noblock = msg->msg_flags & MSG_DONTWAIT; |
| |
| err = sock_error(sk); |
| if (err) |
| return err; |
| |
| if (msg->msg_flags & MSG_OOB) |
| return -EOPNOTSUPP; |
| |
| /* SOCK_SEQPACKET: we do not support segmented records */ |
| if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) |
| return -EOPNOTSUPP; |
| |
| lock_sock(sk); |
| |
| if (sk->sk_shutdown & SEND_SHUTDOWN) { |
| err = -EPIPE; |
| goto out; |
| } |
| |
| /* Return if the socket is not in connected state */ |
| if (sk->sk_state != IUCV_CONNECTED) { |
| err = -ENOTCONN; |
| goto out; |
| } |
| |
| /* initialize defaults */ |
| cmsg_done = 0; /* check for duplicate headers */ |
| |
| /* iterate over control messages */ |
| for_each_cmsghdr(cmsg, msg) { |
| if (!CMSG_OK(msg, cmsg)) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| if (cmsg->cmsg_level != SOL_IUCV) |
| continue; |
| |
| if (cmsg->cmsg_type & cmsg_done) { |
| err = -EINVAL; |
| goto out; |
| } |
| cmsg_done |= cmsg->cmsg_type; |
| |
| switch (cmsg->cmsg_type) { |
| case SCM_IUCV_TRGCLS: |
| if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| /* set iucv message target class */ |
| memcpy(&txmsg.class, |
| (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); |
| |
| break; |
| |
| default: |
| err = -EINVAL; |
| goto out; |
| } |
| } |
| |
| /* allocate one skb for each iucv message: |
| * this is fine for SOCK_SEQPACKET (unless we want to support |
| * segmented records using the MSG_EOR flag), but |
| * for SOCK_STREAM we might want to improve it in future */ |
| if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
| headroom = sizeof(struct af_iucv_trans_hdr) + |
| LL_RESERVED_SPACE(iucv->hs_dev); |
| linear = min(len, PAGE_SIZE - headroom); |
| } else { |
| if (len < PAGE_SIZE) { |
| linear = len; |
| } else { |
| /* In nonlinear "classic" iucv skb, |
| * reserve space for iucv_array |
| */ |
| headroom = sizeof(struct iucv_array) * |
| (MAX_SKB_FRAGS + 1); |
| linear = PAGE_SIZE - headroom; |
| } |
| } |
| skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, |
| noblock, &err, 0); |
| if (!skb) |
| goto out; |
| if (headroom) |
| skb_reserve(skb, headroom); |
| skb_put(skb, linear); |
| skb->len = len; |
| skb->data_len = len - linear; |
| err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); |
| if (err) |
| goto fail; |
| |
| /* wait if outstanding messages for iucv path has reached */ |
| timeo = sock_sndtimeo(sk, noblock); |
| err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); |
| if (err) |
| goto fail; |
| |
| /* return -ECONNRESET if the socket is no longer connected */ |
| if (sk->sk_state != IUCV_CONNECTED) { |
| err = -ECONNRESET; |
| goto fail; |
| } |
| |
| /* increment and save iucv message tag for msg_completion cbk */ |
| txmsg.tag = iucv->send_tag++; |
| IUCV_SKB_CB(skb)->tag = txmsg.tag; |
| |
| if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
| atomic_inc(&iucv->msg_sent); |
| err = afiucv_hs_send(&txmsg, sk, skb, 0); |
| if (err) { |
| atomic_dec(&iucv->msg_sent); |
| goto out; |
| } |
| } else { /* Classic VM IUCV transport */ |
| skb_queue_tail(&iucv->send_skb_q, skb); |
| atomic_inc(&iucv->skbs_in_xmit); |
| |
| if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && |
| skb->len <= 7) { |
| err = iucv_send_iprm(iucv->path, &txmsg, skb); |
| |
| /* on success: there is no message_complete callback */ |
| /* for an IPRMDATA msg; remove skb from send queue */ |
| if (err == 0) { |
| atomic_dec(&iucv->skbs_in_xmit); |
| skb_unlink(skb, &iucv->send_skb_q); |
| consume_skb(skb); |
| } |
| |
| /* this error should never happen since the */ |
| /* IUCV_IPRMDATA path flag is set... sever path */ |
| if (err == 0x15) { |
| pr_iucv->path_sever(iucv->path, NULL); |
| atomic_dec(&iucv->skbs_in_xmit); |
| skb_unlink(skb, &iucv->send_skb_q); |
| err = -EPIPE; |
| goto fail; |
| } |
| } else if (skb_is_nonlinear(skb)) { |
| struct iucv_array *iba = (struct iucv_array *)skb->head; |
| int i; |
| |
| /* skip iucv_array lying in the headroom */ |
| iba[0].address = (u32)(addr_t)skb->data; |
| iba[0].length = (u32)skb_headlen(skb); |
| for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
| |
| iba[i + 1].address = |
| (u32)(addr_t)skb_frag_address(frag); |
| iba[i + 1].length = (u32)skb_frag_size(frag); |
| } |
| err = pr_iucv->message_send(iucv->path, &txmsg, |
| IUCV_IPBUFLST, 0, |
| (void *)iba, skb->len); |
| } else { /* non-IPRM Linear skb */ |
| err = pr_iucv->message_send(iucv->path, &txmsg, |
| 0, 0, (void *)skb->data, skb->len); |
| } |
| if (err) { |
| if (err == 3) { |
| user_id[8] = 0; |
| memcpy(user_id, iucv->dst_user_id, 8); |
| appl_id[8] = 0; |
| memcpy(appl_id, iucv->dst_name, 8); |
| pr_err( |
| "Application %s on z/VM guest %s exceeds message limit\n", |
| appl_id, user_id); |
| err = -EAGAIN; |
| } else { |
| err = -EPIPE; |
| } |
| |
| atomic_dec(&iucv->skbs_in_xmit); |
| skb_unlink(skb, &iucv->send_skb_q); |
| goto fail; |
| } |
| } |
| |
| release_sock(sk); |
| return len; |
| |
| fail: |
| kfree_skb(skb); |
| out: |
| release_sock(sk); |
| return err; |
| } |
| |
| static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) |
| { |
| size_t headroom, linear; |
| struct sk_buff *skb; |
| int err; |
| |
| if (len < PAGE_SIZE) { |
| headroom = 0; |
| linear = len; |
| } else { |
| headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); |
| linear = PAGE_SIZE - headroom; |
| } |
| skb = alloc_skb_with_frags(headroom + linear, len - linear, |
| 0, &err, GFP_ATOMIC | GFP_DMA); |
| WARN_ONCE(!skb, |
| "alloc of recv iucv skb len=%lu failed with errcode=%d\n", |
| len, err); |
| if (skb) { |
| if (headroom) |
| skb_reserve(skb, headroom); |
| skb_put(skb, linear); |
| skb->len = len; |
| skb->data_len = len - linear; |
| } |
| return skb; |
| } |
| |
| /* iucv_process_message() - Receive a single outstanding IUCV message |
| * |
| * Locking: must be called with message_q.lock held |
| */ |
| static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
| struct iucv_path *path, |
| struct iucv_message *msg) |
| { |
| int rc; |
| unsigned int len; |
| |
| len = iucv_msg_length(msg); |
| |
| /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
| /* Note: the first 4 bytes are reserved for msg tag */ |
| IUCV_SKB_CB(skb)->class = msg->class; |
| |
| /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
| if ((msg->flags & IUCV_IPRMDATA) && len > 7) { |
| if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { |
| skb->data = NULL; |
| skb->len = 0; |
| } |
| } else { |
| if (skb_is_nonlinear(skb)) { |
| struct iucv_array *iba = (struct iucv_array *)skb->head; |
| int i; |
| |
| iba[0].address = (u32)(addr_t)skb->data; |
| iba[0].length = (u32)skb_headlen(skb); |
| for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
| |
| iba[i + 1].address = |
| (u32)(addr_t)skb_frag_address(frag); |
| iba[i + 1].length = (u32)skb_frag_size(frag); |
| } |
| rc = pr_iucv->message_receive(path, msg, |
| IUCV_IPBUFLST, |
| (void *)iba, len, NULL); |
| } else { |
| rc = pr_iucv->message_receive(path, msg, |
| msg->flags & IUCV_IPRMDATA, |
| skb->data, len, NULL); |
| } |
| if (rc) { |
| kfree_skb(skb); |
| return; |
| } |
| WARN_ON_ONCE(skb->len != len); |
| } |
| |
| IUCV_SKB_CB(skb)->offset = 0; |
| if (sk_filter(sk, skb)) { |
| atomic_inc(&sk->sk_drops); /* skb rejected by filter */ |
| kfree_skb(skb); |
| return; |
| } |
| if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ |
| skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); |
| } |
| |
| /* iucv_process_message_q() - Process outstanding IUCV messages |
| * |
| * Locking: must be called with message_q.lock held |
| */ |
| static void iucv_process_message_q(struct sock *sk) |
| { |
| struct iucv_sock *iucv = iucv_sk(sk); |
| struct sk_buff *skb; |
| struct sock_msg_q *p, *n; |
| |
| list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { |
| skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); |
| if (!skb) |
| break; |
| iucv_process_message(sk, skb, p->path, &p->msg); |
| list_del(&p->list); |
| kfree(p); |
| if (!skb_queue_empty(&iucv->backlog_skb_q)) |
| break; |
| } |
| } |
| |
| static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, |
| size_t len, int flags) |
| { |
| int noblock = flags & MSG_DONTWAIT; |
| struct sock *sk = sock->sk; |
| struct iucv_sock *iucv = iucv_sk(sk); |
| unsigned int copied, rlen; |
| struct sk_buff *skb, *rskb, *cskb; |
| int err = 0; |
| u32 offset; |
| |
| if ((sk->sk_state == IUCV_DISCONN) && |
| skb_queue_empty(&iucv->backlog_skb_q) && |
| skb_queue_empty(&sk->sk_receive_queue) && |
| list_empty(&iucv->message_q.list)) |
| return 0; |
| |
| if (flags & (MSG_OOB)) |
| return -EOPNOTSUPP; |
| |
| /* receive/dequeue next skb: |
| * the function understands MSG_PEEK and, thus, does not dequeue skb */ |
| skb = skb_recv_datagram(sk, flags, noblock, &err); |
| if (!skb) { |
| if (sk->sk_shutdown & RCV_SHUTDOWN) |
| return 0; |
| return err; |
| } |
| |
| offset = IUCV_SKB_CB(skb)->offset; |
| rlen = skb->len - offset; /* real length of skb */ |
| copied = min_t(unsigned int, rlen, len); |
| if (!rlen) |
| sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; |
| |
| cskb = skb; |
| if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { |
| if (!(flags & MSG_PEEK)) |
| skb_queue_head(&sk->sk_receive_queue, skb); |
| return -EFAULT; |
| } |
| |
| /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
| if (sk->sk_type == SOCK_SEQPACKET) { |
| if (copied < rlen) |
| msg->msg_flags |= MSG_TRUNC; |
| /* each iucv message contains a complete record */ |
| msg->msg_flags |= MSG_EOR; |
| } |
| |
| /* create control message to store iucv msg target class: |
| * get the trgcls from the control buffer of the skb due to |
| * fragmentation of original iucv message. */ |
| err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, |
| sizeof(IUCV_SKB_CB(skb)->class), |
| (void *)&IUCV_SKB_CB(skb)->class); |
| if (err) { |
| if (!(flags & MSG_PEEK)) |
| skb_queue_head(&sk->sk_receive_queue, skb); |
| return err; |
| } |
| |
| /* Mark read part of skb as used */ |
| if (!(flags & MSG_PEEK)) { |
| |
| /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
| if (sk->sk_type == SOCK_STREAM) { |
| if (copied < rlen) { |
| IUCV_SKB_CB(skb)->offset = offset + copied; |
| skb_queue_head(&sk->sk_receive_queue, skb); |
| goto done; |
| } |
| } |
| |
| consume_skb(skb); |
| if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
| atomic_inc(&iucv->msg_recv); |
| if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { |
| WARN_ON(1); |
| iucv_sock_close(sk); |
| return -EFAULT; |
| } |
| } |
| |
| /* Queue backlog skbs */ |
| spin_lock_bh(&iucv->message_q.lock); |
| rskb = skb_dequeue(&iucv->backlog_skb_q); |
| while (rskb) { |
| IUCV_SKB_CB(rskb)->offset = 0; |
| if (__sock_queue_rcv_skb(sk, rskb)) { |
| /* handle rcv queue full */ |
| skb_queue_head(&iucv->backlog_skb_q, |
| rskb); |
| break; |
| } |
| rskb = skb_dequeue(&iucv->backlog_skb_q); |
| } |
| if (skb_queue_empty(&iucv->backlog_skb_q)) { |
| if (!list_empty(&iucv->message_q.list)) |
| iucv_process_message_q(sk); |
| if (atomic_read(&iucv->msg_recv) >= |
| iucv->msglimit / 2) { |
| err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); |
| if (err) { |
| sk->sk_state = IUCV_DISCONN; |
| sk->sk_state_change(sk); |
| } |
| } |
| } |
| spin_unlock_bh(&iucv->message_q.lock); |
| } |
| |
| done: |
| /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
| if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) |
| copied = rlen; |
| |
| return copied; |
| } |
| |
| static inline __poll_t iucv_accept_poll(struct sock *parent) |
| { |
| struct iucv_sock *isk, *n; |
| struct sock *sk; |
| |
| list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
| sk = (struct sock *) isk; |
| |
| if (sk->sk_state == IUCV_CONNECTED) |
| return EPOLLIN | EPOLLRDNORM; |
| } |
| |
| return 0; |
| } |
| |
| static __poll_t iucv_sock_poll(struct file *file, struct socket *sock, |
| poll_table *wait) |
| { |
| struct sock *sk = sock->sk; |
| __poll_t mask = 0; |
| |
| sock_poll_wait(file, sock, wait); |
| |
| if (sk->sk_state == IUCV_LISTEN) |
| return iucv_accept_poll(sk); |
| |
| if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) |
| mask |= EPOLLERR | |
| (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); |
| |
| if (sk->sk_shutdown & RCV_SHUTDOWN) |
| mask |= EPOLLRDHUP; |
| |
| if (sk->sk_shutdown == SHUTDOWN_MASK) |
| mask |= EPOLLHUP; |
| |
| if (!skb_queue_empty(&sk->sk_receive_queue) || |
| (sk->sk_shutdown & RCV_SHUTDOWN)) |
| mask |= EPOLLIN | EPOLLRDNORM; |
| |
| if (sk->sk_state == IUCV_CLOSED) |
| mask |= EPOLLHUP; |
| |
| if (sk->sk_state == IUCV_DISCONN) |
| mask |= EPOLLIN; |
| |
| if (sock_writeable(sk) && iucv_below_msglim(sk)) |
| mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
| else |
| sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
| |
| return mask; |
| } |
| |
| static int iucv_sock_shutdown(struct socket *sock, int how) |
| { |
| struct sock *sk = sock->sk; |
| struct iucv_sock *iucv = iucv_sk(sk); |
| struct iucv_message txmsg; |
| int err = 0; |
| |
| how++; |
| |
| if ((how & ~SHUTDOWN_MASK) || !how) |
| return -EINVAL; |
| |
| lock_sock(sk); |
| switch (sk->sk_state) { |
| case IUCV_LISTEN: |
| case IUCV_DISCONN: |
| case IUCV_CLOSING: |
| case IUCV_CLOSED: |
| err = -ENOTCONN; |
| goto fail; |
| default: |
| break; |
| } |
| |
| if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) && |
| sk->sk_state == IUCV_CONNECTED) { |
| if (iucv->transport == AF_IUCV_TRANS_IUCV) { |
| txmsg.class = 0; |
| txmsg.tag = 0; |
| err = pr_iucv->message_send(iucv->path, &txmsg, |
| IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); |
| if (err) { |
| switch (err) { |
| case 1: |
| err = -ENOTCONN; |
| break; |
| case 2: |
| err = -ECONNRESET; |
| break; |
| default: |
| err = -ENOTCONN; |
| break; |
| } |
| } |
| } else |
| iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); |
| } |
| |
| sk->sk_shutdown |= how; |
| if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { |
| if ((iucv->transport == AF_IUCV_TRANS_IUCV) && |
| iucv->path) { |
| err = pr_iucv->path_quiesce(iucv->path, NULL); |
| if (err) |
| err = -ENOTCONN; |
| /* skb_queue_purge(&sk->sk_receive_queue); */ |
| } |
| skb_queue_purge(&sk->sk_receive_queue); |
| } |
| |
| /* Wake up anyone sleeping in poll */ |
| sk->sk_state_change(sk); |
| |
| fail: |
| release_sock(sk); |
| return err; |
| } |
| |
| static int iucv_sock_release(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| int err = 0; |
| |
| if (!sk) |
| return 0; |
| |
| iucv_sock_close(sk); |
| |
| sock_orphan(sk); |
| iucv_sock_kill(sk); |
| return err; |
| } |
| |
| /* getsockopt and setsockopt */ |
| static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, |
| sockptr_t optval, unsigned int optlen) |
| { |
| struct sock *sk = sock->sk; |
| struct iucv_sock *iucv = iucv_sk(sk); |
| int val; |
| int rc; |
| |
| if (level != SOL_IUCV) |
| return -ENOPROTOOPT; |
| |
| if (optlen < sizeof(int)) |
| return -EINVAL; |
| |
| if (copy_from_sockptr(&val, optval, sizeof(int))) |
| return -EFAULT; |
| |
| rc = 0; |
| |
| lock_sock(sk); |
| switch (optname) { |
| case SO_IPRMDATA_MSG: |
| if (val) |
| iucv->flags |= IUCV_IPRMDATA; |
| else |
| iucv->flags &= ~IUCV_IPRMDATA; |
| break; |
| case SO_MSGLIMIT: |
| switch (sk->sk_state) { |
| case IUCV_OPEN: |
| case IUCV_BOUND: |
| if (val < 1 || val > U16_MAX) |
| rc = -EINVAL; |
| else |
| iucv->msglimit = val; |
| break; |
| default: |
| rc = -EINVAL; |
| break; |
| } |
| break; |
| default: |
| rc = -ENOPROTOOPT; |
| break; |
| } |
| release_sock(sk); |
| |
| return rc; |
| } |
| |
| static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| struct sock *sk = sock->sk; |
| struct iucv_sock *iucv = iucv_sk(sk); |
| unsigned int val; |
| int len; |
| |
| if (level != SOL_IUCV) |
| return -ENOPROTOOPT; |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| |
| if (len < 0) |
| return -EINVAL; |
| |
| len = min_t(unsigned int, len, sizeof(int)); |
| |
| switch (optname) { |
| case SO_IPRMDATA_MSG: |
| val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; |
| break; |
| case SO_MSGLIMIT: |
| lock_sock(sk); |
| val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ |
| : iucv->msglimit; /* default */ |
| release_sock(sk); |
| break; |
| case SO_MSGSIZE: |
| if (sk->sk_state == IUCV_OPEN) |
| return -EBADFD; |
| val = (iucv->hs_dev) ? iucv->hs_dev->mtu - |
| sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : |
| 0x7fffffff; |
| break; |
| default: |
| return -ENOPROTOOPT; |
| } |
| |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| if (copy_to_user(optval, &val, len)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| |
| /* Callback wrappers - called from iucv base support */ |
| static int iucv_callback_connreq(struct iucv_path *path, |
| u8 ipvmid[8], u8 ipuser[16]) |
| { |
| unsigned char user_data[16]; |
| unsigned char nuser_data[16]; |
| unsigned char src_name[8]; |
| struct sock *sk, *nsk; |
| struct iucv_sock *iucv, *niucv; |
| int err; |
| |
| memcpy(src_name, ipuser, 8); |
| EBCASC(src_name, 8); |
| /* Find out if this path belongs to af_iucv. */ |
| read_lock(&iucv_sk_list.lock); |
| iucv = NULL; |
| sk = NULL; |
| sk_for_each(sk, &iucv_sk_list.head) |
| if (sk->sk_state == IUCV_LISTEN && |
| !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { |
| /* |
| * Found a listening socket with |
| * src_name == ipuser[0-7]. |
| */ |
| iucv = iucv_sk(sk); |
| break; |
| } |
| read_unlock(&iucv_sk_list.lock); |
| if (!iucv) |
| /* No socket found, not one of our paths. */ |
| return -EINVAL; |
| |
| bh_lock_sock(sk); |
| |
| /* Check if parent socket is listening */ |
| low_nmcpy(user_data, iucv->src_name); |
| high_nmcpy(user_data, iucv->dst_name); |
| ASCEBC(user_data, sizeof(user_data)); |
| if (sk->sk_state != IUCV_LISTEN) { |
| err = pr_iucv->path_sever(path, user_data); |
| iucv_path_free(path); |
| goto fail; |
| } |
| |
| /* Check for backlog size */ |
| if (sk_acceptq_is_full(sk)) { |
| err = pr_iucv->path_sever(path, user_data); |
| iucv_path_free(path); |
| goto fail; |
| } |
| |
| /* Create the new socket */ |
| nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); |
| if (!nsk) { |
| err = pr_iucv->path_sever(path, user_data); |
| iucv_path_free(path); |
| goto fail; |
| } |
| |
| niucv = iucv_sk(nsk); |
| iucv_sock_init(nsk, sk); |
| niucv->transport = AF_IUCV_TRANS_IUCV; |
| nsk->sk_allocation |= GFP_DMA; |
| |
| /* Set the new iucv_sock */ |
| memcpy(niucv->dst_name, ipuser + 8, 8); |
| EBCASC(niucv->dst_name, 8); |
| memcpy(niucv->dst_user_id, ipvmid, 8); |
| memcpy(niucv->src_name, iucv->src_name, 8); |
| memcpy(niucv->src_user_id, iucv->src_user_id, 8); |
| niucv->path = path; |
| |
| /* Call iucv_accept */ |
| high_nmcpy(nuser_data, ipuser + 8); |
| memcpy(nuser_data + 8, niucv->src_name, 8); |
| ASCEBC(nuser_data + 8, 8); |
| |
| /* set message limit for path based on msglimit of accepting socket */ |
| niucv->msglimit = iucv->msglimit; |
| path->msglim = iucv->msglimit; |
| err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); |
| if (err) { |
| iucv_sever_path(nsk, 1); |
| iucv_sock_kill(nsk); |
| goto fail; |
| } |
| |
| iucv_accept_enqueue(sk, nsk); |
| |
| /* Wake up accept */ |
| nsk->sk_state = IUCV_CONNECTED; |
| sk->sk_data_ready(sk); |
| err = 0; |
| fail: |
| bh_unlock_sock(sk); |
| return 0; |
| } |
| |
| static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) |
| { |
| struct sock *sk = path->private; |
| |
| sk->sk_state = IUCV_CONNECTED; |
| sk->sk_state_change(sk); |
| } |
| |
| static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) |
| { |
| struct sock *sk = path->private; |
| struct iucv_sock *iucv = iucv_sk(sk); |
| struct sk_buff *skb; |
| struct sock_msg_q *save_msg; |
| int len; |
| |
| if (sk->sk_shutdown & RCV_SHUTDOWN) { |
| pr_iucv->message_reject(path, msg); |
| return; |
| } |
| |
| spin_lock(&iucv->message_q.lock); |
| |
| if (!list_empty(&iucv->message_q.list) || |
| !skb_queue_empty(&iucv->backlog_skb_q)) |
| goto save_message; |
| |
| len = atomic_read(&sk->sk_rmem_alloc); |
| len += SKB_TRUESIZE(iucv_msg_length(msg)); |
| if (len > sk->sk_rcvbuf) |
| goto save_message; |
| |
| skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); |
| if (!skb) |
| goto save_message; |
| |
| iucv_process_message(sk, skb, path, msg); |
| goto out_unlock; |
| |
| save_message: |
| save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); |
| if (!save_msg) |
| goto out_unlock; |
| save_msg->path = path; |
| save_msg->msg = *msg; |
| |
| list_add_tail(&save_msg->list, &iucv->message_q.list); |
| |
| out_unlock: |
| spin_unlock(&iucv->message_q.lock); |
| } |
| |
| static void iucv_callback_txdone(struct iucv_path *path, |
| struct iucv_message *msg) |
| { |
| struct sock *sk = path->private; |
| struct sk_buff *this = NULL; |
| struct sk_buff_head *list; |
| struct sk_buff *list_skb; |
| struct iucv_sock *iucv; |
| unsigned long flags; |
| |
| iucv = iucv_sk(sk); |
| list = &iucv->send_skb_q; |
| |
| bh_lock_sock(sk); |
| |
| spin_lock_irqsave(&list->lock, flags); |
| skb_queue_walk(list, list_skb) { |
| if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { |
| this = list_skb; |
| break; |
| } |
| } |
| if (this) { |
| atomic_dec(&iucv->skbs_in_xmit); |
| __skb_unlink(this, list); |
| } |
| |
| spin_unlock_irqrestore(&list->lock, flags); |
| |
| if (this) { |
| consume_skb(this); |
| /* wake up any process waiting for sending */ |
| iucv_sock_wake_msglim(sk); |
| } |
| |
| if (sk->sk_state == IUCV_CLOSING) { |
| if (atomic_read(&iucv->skbs_in_xmit) == 0) { |
| sk->sk_state = IUCV_CLOSED; |
| sk->sk_state_change(sk); |
| } |
| } |
| bh_unlock_sock(sk); |
| |
| } |
| |
| static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) |
| { |
| struct sock *sk = path->private; |
| |
| if (sk->sk_state == IUCV_CLOSED) |
| return; |
| |
| bh_lock_sock(sk); |
| iucv_sever_path(sk, 1); |
| sk->sk_state = IUCV_DISCONN; |
| |
| sk->sk_state_change(sk); |
| bh_unlock_sock(sk); |
| } |
| |
| /* called if the other communication side shuts down its RECV direction; |
| * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. |
| */ |
| static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) |
| { |
| struct sock *sk = path->private; |
| |
| bh_lock_sock(sk); |
| if (sk->sk_state != IUCV_CLOSED) { |
| sk->sk_shutdown |= SEND_SHUTDOWN; |
| sk->sk_state_change(sk); |
| } |
| bh_unlock_sock(sk); |
| } |
| |
| static struct iucv_handler af_iucv_handler = { |
| .path_pending = iucv_callback_connreq, |
| .path_complete = iucv_callback_connack, |
| .path_severed = iucv_callback_connrej, |
| .message_pending = iucv_callback_rx, |
| .message_complete = iucv_callback_txdone, |
| .path_quiesced = iucv_callback_shutdown, |
| }; |
| |
| /***************** HiperSockets transport callbacks ********************/ |
| static void afiucv_swap_src_dest(struct sk_buff *skb) |
| { |
| struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); |
| char tmpID[8]; |
| char tmpName[8]; |
| |
| ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); |
| ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); |
| ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); |
| ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); |
| memcpy(tmpID, trans_hdr->srcUserID, 8); |
| memcpy(tmpName, trans_hdr->srcAppName, 8); |
| memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); |
| memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); |
| memcpy(trans_hdr->destUserID, tmpID, 8); |
| memcpy(trans_hdr->destAppName, tmpName, 8); |
| skb_push(skb, ETH_HLEN); |
| memset(skb->data, 0, ETH_HLEN); |
| } |
| |
| /* |
| * afiucv_hs_callback_syn - react on received SYN |
| */ |
| static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) |
| { |
| struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); |
| struct sock *nsk; |
| struct iucv_sock *iucv, *niucv; |
| int err; |
| |
| iucv = iucv_sk(sk); |
| if (!iucv) { |
| /* no sock - connection refused */ |
| afiucv_swap_src_dest(skb); |
| trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; |
| err = dev_queue_xmit(skb); |
| goto out; |
| } |
| |
| nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); |
| bh_lock_sock(sk); |
| if ((sk->sk_state != IUCV_LISTEN) || |
| sk_acceptq_is_full(sk) || |
| !nsk) { |
| /* error on server socket - connection refused */ |
| afiucv_swap_src_dest(skb); |
| trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; |
| err = dev_queue_xmit(skb); |
| iucv_sock_kill(nsk); |
| bh_unlock_sock(sk); |
| goto out; |
| } |
| |
| niucv = iucv_sk(nsk); |
| iucv_sock_init(nsk, sk); |
| niucv->transport = AF_IUCV_TRANS_HIPER; |
| niucv->msglimit = iucv->msglimit; |
| if (!trans_hdr->window) |
| niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; |
| else |
| niucv->msglimit_peer = trans_hdr->window; |
| memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); |
| memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); |
| memcpy(niucv->src_name, iucv->src_name, 8); |
| memcpy(niucv->src_user_id, iucv->src_user_id, 8); |
| nsk->sk_bound_dev_if = sk->sk_bound_dev_if; |
| niucv->hs_dev = iucv->hs_dev; |
| dev_hold(niucv->hs_dev); |
| afiucv_swap_src_dest(skb); |
| trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; |
| trans_hdr->window = niucv->msglimit; |
| /* if receiver acks the xmit connection is established */ |
| err = dev_queue_xmit(skb); |
| if (!err) { |
| iucv_accept_enqueue(sk, nsk); |
| nsk->sk_state = IUCV_CONNECTED; |
| sk->sk_data_ready(sk); |
| } else |
| iucv_sock_kill(nsk); |
| bh_unlock_sock(sk); |
| |
| out: |
| return NET_RX_SUCCESS; |
| } |
| |
| /* |
| * afiucv_hs_callback_synack() - react on received SYN-ACK |
| */ |
| static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) |
| { |
| struct iucv_sock *iucv = iucv_sk(sk); |
| |
| if (!iucv || sk->sk_state != IUCV_BOUND) { |
| kfree_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| bh_lock_sock(sk); |
| iucv->msglimit_peer = iucv_trans_hdr(skb)->window; |
| sk->sk_state = IUCV_CONNECTED; |
| sk->sk_state_change(sk); |
| bh_unlock_sock(sk); |
| consume_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| /* |
| * afiucv_hs_callback_synfin() - react on received SYN_FIN |
| */ |
| static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) |
| { |
| struct iucv_sock *iucv = iucv_sk(sk); |
| |
| if (!iucv || sk->sk_state != IUCV_BOUND) { |
| kfree_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| bh_lock_sock(sk); |
| sk->sk_state = IUCV_DISCONN; |
| sk->sk_state_change(sk); |
| bh_unlock_sock(sk); |
| consume_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| /* |
| * afiucv_hs_callback_fin() - react on received FIN |
| */ |
| static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) |
| { |
| struct iucv_sock *iucv = iucv_sk(sk); |
| |
| /* other end of connection closed */ |
| if (!iucv) { |
| kfree_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| bh_lock_sock(sk); |
| if (sk->sk_state == IUCV_CONNECTED) { |
| sk->sk_state = IUCV_DISCONN; |
| sk->sk_state_change(sk); |
| } |
| bh_unlock_sock(sk); |
| consume_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| /* |
| * afiucv_hs_callback_win() - react on received WIN |
| */ |
| static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) |
| { |
| struct iucv_sock *iucv = iucv_sk(sk); |
| |
| if (!iucv) |
| return NET_RX_SUCCESS; |
| |
| if (sk->sk_state != IUCV_CONNECTED) |
| return NET_RX_SUCCESS; |
| |
| atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent); |
| iucv_sock_wake_msglim(sk); |
| return NET_RX_SUCCESS; |
| } |
| |
| /* |
| * afiucv_hs_callback_rx() - react on received data |
| */ |
| static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) |
| { |
| struct iucv_sock *iucv = iucv_sk(sk); |
| |
| if (!iucv) { |
| kfree_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| if (sk->sk_state != IUCV_CONNECTED) { |
| kfree_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| if (sk->sk_shutdown & RCV_SHUTDOWN) { |
| kfree_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| /* write stuff from iucv_msg to skb cb */ |
| skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); |
| skb_reset_transport_header(skb); |
| skb_reset_network_header(skb); |
| IUCV_SKB_CB(skb)->offset = 0; |
| if (sk_filter(sk, skb)) { |
| atomic_inc(&sk->sk_drops); /* skb rejected by filter */ |
| kfree_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| spin_lock(&iucv->message_q.lock); |
| if (skb_queue_empty(&iucv->backlog_skb_q)) { |
| if (__sock_queue_rcv_skb(sk, skb)) |
| /* handle rcv queue full */ |
| skb_queue_tail(&iucv->backlog_skb_q, skb); |
| } else |
| skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); |
| spin_unlock(&iucv->message_q.lock); |
| return NET_RX_SUCCESS; |
| } |
| |
| /* |
| * afiucv_hs_rcv() - base function for arriving data through HiperSockets |
| * transport |
| * called from netif RX softirq |
| */ |
| static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, |
| struct packet_type *pt, struct net_device *orig_dev) |
| { |
| struct sock *sk; |
| struct iucv_sock *iucv; |
| struct af_iucv_trans_hdr *trans_hdr; |
| int err = NET_RX_SUCCESS; |
| char nullstring[8]; |
| |
| if (!pskb_may_pull(skb, sizeof(*trans_hdr))) { |
| kfree_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| trans_hdr = iucv_trans_hdr(skb); |
| EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); |
| EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); |
| EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); |
| EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); |
| memset(nullstring, 0, sizeof(nullstring)); |
| iucv = NULL; |
| sk = NULL; |
| read_lock(&iucv_sk_list.lock); |
| sk_for_each(sk, &iucv_sk_list.head) { |
| if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { |
| if ((!memcmp(&iucv_sk(sk)->src_name, |
| trans_hdr->destAppName, 8)) && |
| (!memcmp(&iucv_sk(sk)->src_user_id, |
| trans_hdr->destUserID, 8)) && |
| (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && |
| (!memcmp(&iucv_sk(sk)->dst_user_id, |
| nullstring, 8))) { |
| iucv = iucv_sk(sk); |
| break; |
| } |
| } else { |
| if ((!memcmp(&iucv_sk(sk)->src_name, |
| trans_hdr->destAppName, 8)) && |
| (!memcmp(&iucv_sk(sk)->src_user_id, |
| trans_hdr->destUserID, 8)) && |
| (!memcmp(&iucv_sk(sk)->dst_name, |
| trans_hdr->srcAppName, 8)) && |
| (!memcmp(&iucv_sk(sk)->dst_user_id, |
| trans_hdr->srcUserID, 8))) { |
| iucv = iucv_sk(sk); |
| break; |
| } |
| } |
| } |
| read_unlock(&iucv_sk_list.lock); |
| if (!iucv) |
| sk = NULL; |
| |
| /* no sock |
| how should we send with no sock |
| 1) send without sock no send rc checking? |
| 2) introduce default sock to handle this cases |
| |
| SYN -> send SYN|ACK in good case, send SYN|FIN in bad case |
| data -> send FIN |
| SYN|ACK, SYN|FIN, FIN -> no action? */ |
| |
| switch (trans_hdr->flags) { |
| case AF_IUCV_FLAG_SYN: |
| /* connect request */ |
| err = afiucv_hs_callback_syn(sk, skb); |
| break; |
| case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): |
| /* connect request confirmed */ |
| err = afiucv_hs_callback_synack(sk, skb); |
| break; |
| case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): |
| /* connect request refused */ |
| err = afiucv_hs_callback_synfin(sk, skb); |
| break; |
| case (AF_IUCV_FLAG_FIN): |
| /* close request */ |
| err = afiucv_hs_callback_fin(sk, skb); |
| break; |
| case (AF_IUCV_FLAG_WIN): |
| err = afiucv_hs_callback_win(sk, skb); |
| if (skb->len == sizeof(struct af_iucv_trans_hdr)) { |
| consume_skb(skb); |
| break; |
| } |
| fallthrough; /* and receive non-zero length data */ |
| case (AF_IUCV_FLAG_SHT): |
| /* shutdown request */ |
| fallthrough; /* and receive zero length data */ |
| case 0: |
| /* plain data frame */ |
| IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; |
| err = afiucv_hs_callback_rx(sk, skb); |
| break; |
| default: |
| kfree_skb(skb); |
| } |
| |
| return err; |
| } |
| |
| /* |
| * afiucv_hs_callback_txnotify() - handle send notifications from HiperSockets |
| * transport |
| */ |
| static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify n) |
| { |
| struct iucv_sock *iucv = iucv_sk(sk); |
| |
| if (sock_flag(sk, SOCK_ZAPPED)) |
| return; |
| |
| switch (n) { |
| case TX_NOTIFY_OK: |
| atomic_dec(&iucv->skbs_in_xmit); |
| iucv_sock_wake_msglim(sk); |
| break; |
| case TX_NOTIFY_PENDING: |
| atomic_inc(&iucv->pendings); |
| break; |
| case TX_NOTIFY_DELAYED_OK: |
| atomic_dec(&iucv->skbs_in_xmit); |
| if (atomic_dec_return(&iucv->pendings) <= 0) |
| iucv_sock_wake_msglim(sk); |
| break; |
| default: |
| atomic_dec(&iucv->skbs_in_xmit); |
| if (sk->sk_state == IUCV_CONNECTED) { |
| sk->sk_state = IUCV_DISCONN; |
| sk->sk_state_change(sk); |
| } |
| } |
| |
| if (sk->sk_state == IUCV_CLOSING) { |
| if (atomic_read(&iucv->skbs_in_xmit) == 0) { |
| sk->sk_state = IUCV_CLOSED; |
| sk->sk_state_change(sk); |
| } |
| } |
| } |
| |
| /* |
| * afiucv_netdev_event: handle netdev notifier chain events |
| */ |
| static int afiucv_netdev_event(struct notifier_block *this, |
| unsigned long event, void *ptr) |
| { |
| struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); |
| struct sock *sk; |
| struct iucv_sock *iucv; |
| |
| switch (event) { |
| case NETDEV_REBOOT: |
| case NETDEV_GOING_DOWN: |
| sk_for_each(sk, &iucv_sk_list.head) { |
| iucv = iucv_sk(sk); |
| if ((iucv->hs_dev == event_dev) && |
| (sk->sk_state == IUCV_CONNECTED)) { |
| if (event == NETDEV_GOING_DOWN) |
| iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); |
| sk->sk_state = IUCV_DISCONN; |
| sk->sk_state_change(sk); |
| } |
| } |
| break; |
| case NETDEV_DOWN: |
| case NETDEV_UNREGISTER: |
| default: |
| break; |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block afiucv_netdev_notifier = { |
| .notifier_call = afiucv_netdev_event, |
| }; |
| |
| static const struct proto_ops iucv_sock_ops = { |
| .family = PF_IUCV, |
| .owner = THIS_MODULE, |
| .release = iucv_sock_release, |
| .bind = iucv_sock_bind, |
| .connect = iucv_sock_connect, |
| .listen = iucv_sock_listen, |
| .accept = iucv_sock_accept, |
| .getname = iucv_sock_getname, |
| .sendmsg = iucv_sock_sendmsg, |
| .recvmsg = iucv_sock_recvmsg, |
| .poll = iucv_sock_poll, |
| .ioctl = sock_no_ioctl, |
| .mmap = sock_no_mmap, |
| .socketpair = sock_no_socketpair, |
| .shutdown = iucv_sock_shutdown, |
| .setsockopt = iucv_sock_setsockopt, |
| .getsockopt = iucv_sock_getsockopt, |
| }; |
| |
| static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, |
| int kern) |
| { |
| struct sock *sk; |
| |
| if (protocol && protocol != PF_IUCV) |
| return -EPROTONOSUPPORT; |
| |
| sock->state = SS_UNCONNECTED; |
| |
| switch (sock->type) { |
| case SOCK_STREAM: |
| case SOCK_SEQPACKET: |
| /* currently, proto ops can handle both sk types */ |
| sock->ops = &iucv_sock_ops; |
| break; |
| default: |
| return -ESOCKTNOSUPPORT; |
| } |
| |
| sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); |
| if (!sk) |
| return -ENOMEM; |
| |
| iucv_sock_init(sk, NULL); |
| |
| return 0; |
| } |
| |
| static const struct net_proto_family iucv_sock_family_ops = { |
| .family = AF_IUCV, |
| .owner = THIS_MODULE, |
| .create = iucv_sock_create, |
| }; |
| |
| static struct packet_type iucv_packet_type = { |
| .type = cpu_to_be16(ETH_P_AF_IUCV), |
| .func = afiucv_hs_rcv, |
| }; |
| |
| static int __init afiucv_init(void) |
| { |
| int err; |
| |
| if (MACHINE_IS_VM && IS_ENABLED(CONFIG_IUCV)) { |
| cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); |
| if (unlikely(err)) { |
| WARN_ON(err); |
| err = -EPROTONOSUPPORT; |
| goto out; |
| } |
| |
| pr_iucv = &iucv_if; |
| } else { |
| memset(&iucv_userid, 0, sizeof(iucv_userid)); |
| pr_iucv = NULL; |
| } |
| |
| err = proto_register(&iucv_proto, 0); |
| if (err) |
| goto out; |
| err = sock_register(&iucv_sock_family_ops); |
| if (err) |
| goto out_proto; |
| |
| if (pr_iucv) { |
| err = pr_iucv->iucv_register(&af_iucv_handler, 0); |
| if (err) |
| goto out_sock; |
| } |
| |
| err = register_netdevice_notifier(&afiucv_netdev_notifier); |
| if (err) |
| goto out_notifier; |
| |
| dev_add_pack(&iucv_packet_type); |
| return 0; |
| |
| out_notifier: |
| if (pr_iucv) |
| pr_iucv->iucv_unregister(&af_iucv_handler, 0); |
| out_sock: |
| sock_unregister(PF_IUCV); |
| out_proto: |
| proto_unregister(&iucv_proto); |
| out: |
| return err; |
| } |
| |
| static void __exit afiucv_exit(void) |
| { |
| if (pr_iucv) |
| pr_iucv->iucv_unregister(&af_iucv_handler, 0); |
| |
| unregister_netdevice_notifier(&afiucv_netdev_notifier); |
| dev_remove_pack(&iucv_packet_type); |
| sock_unregister(PF_IUCV); |
| proto_unregister(&iucv_proto); |
| } |
| |
| module_init(afiucv_init); |
| module_exit(afiucv_exit); |
| |
| MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); |
| MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); |
| MODULE_VERSION(VERSION); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_NETPROTO(PF_IUCV); |