diff options
Diffstat (limited to 'net/iucv/af_iucv.c')
| -rw-r--r-- | net/iucv/af_iucv.c | 1812 |
1 files changed, 1521 insertions, 291 deletions
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c index 29f7baa2511..7a95fa4a3de 100644 --- a/net/iucv/af_iucv.c +++ b/net/iucv/af_iucv.c @@ -1,13 +1,17 @@ /* - * linux/net/iucv/af_iucv.c - * * IUCV protocol stack for Linux on zSeries * - * Copyright 2006 IBM Corporation + * 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/types.h> #include <linux/list.h> @@ -23,17 +27,13 @@ #include <asm/cpcmd.h> #include <linux/kmod.h> -#include <net/iucv/iucv.h> #include <net/iucv/af_iucv.h> -#define CONFIG_IUCV_SOCK_DEBUG 1 - -#define IPRMDATA 0x80 -#define VERSION "1.0" +#define VERSION "1.2" static char iucv_userid[80]; -static struct proto_ops iucv_sock_ops; +static const struct proto_ops iucv_sock_ops; static struct proto iucv_proto = { .name = "AF_IUCV", @@ -41,8 +41,56 @@ static struct proto iucv_proto = { .obj_size = sizeof(struct iucv_sock), }; +static struct iucv_interface *pr_iucv; + +/* special AF_IUCV IPRM messages */ +static const u8 iprm_shutdown[8] = + {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; + +#define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->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 void iucv_sock_kill(struct sock *sk); static void iucv_sock_close(struct sock *sk); +static void iucv_sever_path(struct sock *, int); + +static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev); +static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, + struct sk_buff *skb, u8 flags); +static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); /* Call Back functions */ static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); @@ -51,6 +99,7 @@ static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], u8 ipuser[16]); static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); +static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); static struct iucv_sock_list iucv_sk_list = { .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), @@ -62,7 +111,8 @@ static struct iucv_handler af_iucv_handler = { .path_complete = iucv_callback_connack, .path_severed = iucv_callback_connrej, .message_pending = iucv_callback_rx, - .message_complete = iucv_callback_txdone + .message_complete = iucv_callback_txdone, + .path_quiesced = iucv_callback_shutdown, }; static inline void high_nmcpy(unsigned char *dst, char *src) @@ -75,31 +125,265 @@ static inline void low_nmcpy(unsigned char *dst, char *src) memcpy(&dst[8], src, 8); } -/* Timers */ -static void iucv_sock_timeout(unsigned long arg) +static int afiucv_pm_prepare(struct device *dev) { - struct sock *sk = (struct sock *)arg; +#ifdef CONFIG_PM_DEBUG + printk(KERN_WARNING "afiucv_pm_prepare\n"); +#endif + return 0; +} - bh_lock_sock(sk); - sk->sk_err = ETIMEDOUT; - sk->sk_state_change(sk); - bh_unlock_sock(sk); +static void afiucv_pm_complete(struct device *dev) +{ +#ifdef CONFIG_PM_DEBUG + printk(KERN_WARNING "afiucv_pm_complete\n"); +#endif +} - iucv_sock_kill(sk); - sock_put(sk); +/** + * afiucv_pm_freeze() - Freeze PM callback + * @dev: AFIUCV dummy device + * + * Sever all established IUCV communication pathes + */ +static int afiucv_pm_freeze(struct device *dev) +{ + struct iucv_sock *iucv; + struct sock *sk; + int err = 0; + +#ifdef CONFIG_PM_DEBUG + printk(KERN_WARNING "afiucv_pm_freeze\n"); +#endif + read_lock(&iucv_sk_list.lock); + sk_for_each(sk, &iucv_sk_list.head) { + iucv = iucv_sk(sk); + switch (sk->sk_state) { + case IUCV_DISCONN: + case IUCV_CLOSING: + case IUCV_CONNECTED: + iucv_sever_path(sk, 0); + break; + case IUCV_OPEN: + case IUCV_BOUND: + case IUCV_LISTEN: + case IUCV_CLOSED: + default: + break; + } + skb_queue_purge(&iucv->send_skb_q); + skb_queue_purge(&iucv->backlog_skb_q); + } + read_unlock(&iucv_sk_list.lock); + return err; +} + +/** + * afiucv_pm_restore_thaw() - Thaw and restore PM callback + * @dev: AFIUCV dummy device + * + * socket clean up after freeze + */ +static int afiucv_pm_restore_thaw(struct device *dev) +{ + struct sock *sk; + +#ifdef CONFIG_PM_DEBUG + printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); +#endif + read_lock(&iucv_sk_list.lock); + sk_for_each(sk, &iucv_sk_list.head) { + switch (sk->sk_state) { + case IUCV_CONNECTED: + sk->sk_err = EPIPE; + sk->sk_state = IUCV_DISCONN; + sk->sk_state_change(sk); + break; + case IUCV_DISCONN: + case IUCV_CLOSING: + case IUCV_LISTEN: + case IUCV_BOUND: + case IUCV_OPEN: + default: + break; + } + } + read_unlock(&iucv_sk_list.lock); + return 0; } -static void iucv_sock_clear_timer(struct sock *sk) +static const struct dev_pm_ops afiucv_pm_ops = { + .prepare = afiucv_pm_prepare, + .complete = afiucv_pm_complete, + .freeze = afiucv_pm_freeze, + .thaw = afiucv_pm_restore_thaw, + .restore = afiucv_pm_restore_thaw, +}; + +static struct device_driver af_iucv_driver = { + .owner = THIS_MODULE, + .name = "afiucv", + .bus = NULL, + .pm = &afiucv_pm_ops, +}; + +/* dummy device used as trigger for PM functions */ +static struct device *af_iucv_dev; + +/** + * 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 + * @state: 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) { - sk_stop_timer(sk, &sk->sk_timer); + 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 (skb_queue_len(&iucv->send_skb_q) < 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 (wq_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; + struct sk_buff *nskb; + int err, confirm_recv = 0; + + memset(skb->head, 0, ETH_HLEN); + phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, + sizeof(struct af_iucv_trans_hdr)); + skb_reset_mac_header(skb); + skb_reset_network_header(skb); + skb_push(skb, ETH_HLEN); + skb_reset_mac_header(skb); + memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); + + 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) + return -ENODEV; + if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) + return -ENETDOWN; + if (skb->len > skb->dev->mtu) { + if (sock->sk_type == SOCK_SEQPACKET) + return -EMSGSIZE; + else + skb_trim(skb, skb->dev->mtu); + } + skb->protocol = ETH_P_AF_IUCV; + nskb = skb_clone(skb, GFP_ATOMIC); + if (!nskb) + return -ENOMEM; + skb_queue_tail(&iucv->send_skb_q, nskb); + err = dev_queue_xmit(skb); + if (net_xmit_eval(err)) { + skb_unlink(nskb, &iucv->send_skb_q); + kfree_skb(nskb); + } else { + atomic_sub(confirm_recv, &iucv->msg_recv); + WARN_ON(atomic_read(&iucv->msg_recv) < 0); + } + return net_xmit_eval(err); } static struct sock *__iucv_get_sock_by_name(char *nm) { struct sock *sk; - struct hlist_node *node; - sk_for_each(sk, node, &iucv_sk_list.head) + sk_for_each(sk, &iucv_sk_list.head) if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) return sk; @@ -109,7 +393,19 @@ static struct sock *__iucv_get_sock_by_name(char *nm) static void iucv_sock_destruct(struct sock *sk) { skb_queue_purge(&sk->sk_receive_queue); - skb_queue_purge(&sk->sk_write_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(atomic_read(&sk->sk_wmem_alloc)); + WARN_ON(sk->sk_wmem_queued); + WARN_ON(sk->sk_forward_alloc); } /* Cleanup Listen */ @@ -124,10 +420,9 @@ static void iucv_sock_cleanup_listen(struct sock *parent) } parent->sk_state = IUCV_CLOSED; - sock_set_flag(parent, SOCK_ZAPPED); } -/* Kill socket */ +/* Kill socket (only if zapped and orphaned) */ static void iucv_sock_kill(struct sock *sk) { if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) @@ -138,15 +433,49 @@ static void iucv_sock_kill(struct sock *sk) 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 FIN through an IUCV socket for HIPER transport */ +static int iucv_send_ctrl(struct sock *sk, u8 flags) +{ + int err = 0; + int blen; + struct sk_buff *skb; + + blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; + skb = sock_alloc_send_skb(sk, blen, 1, &err); + if (skb) { + skb_reserve(skb, blen); + err = afiucv_hs_send(NULL, sk, skb, flags); + } + return err; +} + /* Close an IUCV socket */ static void iucv_sock_close(struct sock *sk) { - unsigned char user_data[16]; struct iucv_sock *iucv = iucv_sk(sk); - int err; unsigned long timeo; + int err = 0; - iucv_sock_clear_timer(sk); lock_sock(sk); switch (sk->sk_state) { @@ -155,48 +484,49 @@ static void iucv_sock_close(struct sock *sk) break; case IUCV_CONNECTED: - case IUCV_DISCONN: - err = 0; - + 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); + } + case IUCV_DISCONN: /* fall through */ sk->sk_state = IUCV_CLOSING; sk->sk_state_change(sk); - if (!skb_queue_empty(&iucv->send_skb_q)) { + if (!err && !skb_queue_empty(&iucv->send_skb_q)) { if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) timeo = sk->sk_lingertime; else timeo = IUCV_DISCONN_TIMEOUT; - err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo); + iucv_sock_wait(sk, + iucv_sock_in_state(sk, IUCV_CLOSED, 0), + timeo); } + case IUCV_CLOSING: /* fall through */ sk->sk_state = IUCV_CLOSED; sk->sk_state_change(sk); - if (iucv->path) { - low_nmcpy(user_data, iucv->src_name); - high_nmcpy(user_data, iucv->dst_name); - ASCEBC(user_data, sizeof(user_data)); - err = iucv_path_sever(iucv->path, user_data); - iucv_path_free(iucv->path); - iucv->path = NULL; - } - sk->sk_err = ECONNRESET; sk->sk_state_change(sk); skb_queue_purge(&iucv->send_skb_q); skb_queue_purge(&iucv->backlog_skb_q); - sock_set_flag(sk, SOCK_ZAPPED); - break; + default: /* fall through */ + iucv_sever_path(sk, 1); + } - default: - sock_set_flag(sk, SOCK_ZAPPED); - break; + 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); - iucv_sock_kill(sk); } static void iucv_sock_init(struct sock *sk, struct sock *parent) @@ -208,19 +538,33 @@ static void iucv_sock_init(struct sock *sk, struct sock *parent) static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) { struct sock *sk; + struct iucv_sock *iucv; sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); if (!sk) return NULL; + iucv = iucv_sk(sk); sock_init_data(sock, sk); - INIT_LIST_HEAD(&iucv_sk(sk)->accept_q); - spin_lock_init(&iucv_sk(sk)->accept_q_lock); - skb_queue_head_init(&iucv_sk(sk)->send_skb_q); - INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list); - spin_lock_init(&iucv_sk(sk)->message_q.lock); - skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q); - iucv_sk(sk)->send_tag = 0; + 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->msg_sent, 0); + atomic_set(&iucv->msg_recv, 0); + iucv->path = NULL; + iucv->sk_txnotify = afiucv_hs_callback_txnotify; + memset(&iucv->src_user_id , 0, 32); + 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; @@ -231,22 +575,32 @@ static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) sk->sk_protocol = proto; sk->sk_state = IUCV_OPEN; - setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk); - iucv_sock_link(&iucv_sk_list, sk); return sk; } /* Create an IUCV socket */ -static int iucv_sock_create(struct net *net, struct socket *sock, int protocol) +static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, + int kern) { struct sock *sk; - if (sock->type != SOCK_STREAM) - return -ESOCKTNOSUPPORT; + if (protocol && protocol != PF_IUCV) + return -EPROTONOSUPPORT; sock->state = SS_UNCONNECTED; - sock->ops = &iucv_sock_ops; + + switch (sock->type) { + case SOCK_STREAM: + sock->ops = &iucv_sock_ops; + break; + 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); if (!sk) @@ -281,7 +635,7 @@ void iucv_accept_enqueue(struct sock *parent, struct sock *sk) list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); spin_unlock_irqrestore(&par->accept_q_lock, flags); iucv_sk(sk)->parent = parent; - parent->sk_ack_backlog++; + sk_acceptq_added(parent); } void iucv_accept_unlink(struct sock *sk) @@ -292,7 +646,7 @@ void iucv_accept_unlink(struct sock *sk) spin_lock_irqsave(&par->accept_q_lock, flags); list_del_init(&iucv_sk(sk)->accept_q); spin_unlock_irqrestore(&par->accept_q_lock, flags); - iucv_sk(sk)->parent->sk_ack_backlog--; + sk_acceptq_removed(iucv_sk(sk)->parent); iucv_sk(sk)->parent = NULL; sock_put(sk); } @@ -313,15 +667,12 @@ struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) } if (sk->sk_state == IUCV_CONNECTED || - sk->sk_state == IUCV_SEVERED || + sk->sk_state == IUCV_DISCONN || !newsock) { iucv_accept_unlink(sk); if (newsock) sock_graft(sk, newsock); - if (sk->sk_state == IUCV_SEVERED) - sk->sk_state = IUCV_DISCONN; - release_sock(sk); return sk; } @@ -331,37 +682,16 @@ struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) return NULL; } -int iucv_sock_wait_state(struct sock *sk, int state, int state2, - unsigned long timeo) +static void __iucv_auto_name(struct iucv_sock *iucv) { - DECLARE_WAITQUEUE(wait, current); - int err = 0; - - add_wait_queue(sk->sk_sleep, &wait); - while (sk->sk_state != state && sk->sk_state != state2) { - set_current_state(TASK_INTERRUPTIBLE); - - if (!timeo) { - err = -EAGAIN; - break; - } - - if (signal_pending(current)) { - err = sock_intr_errno(timeo); - break; - } - - release_sock(sk); - timeo = schedule_timeout(timeo); - lock_sock(sk); + char name[12]; - err = sock_error(sk); - if (err) - break; + 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)); } - set_current_state(TASK_RUNNING); - remove_wait_queue(sk->sk_sleep, &wait); - return err; + memcpy(iucv->src_name, name, 8); } /* Bind an unbound socket */ @@ -371,7 +701,9 @@ static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; struct sock *sk = sock->sk; struct iucv_sock *iucv; - int err; + int err = 0; + struct net_device *dev; + char uid[9]; /* Verify the input sockaddr */ if (!addr || addr->sa_family != AF_IUCV) @@ -390,19 +722,51 @@ static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, err = -EADDRINUSE; goto done_unlock; } - if (iucv->path) { - err = 0; + if (iucv->path) goto done_unlock; - } /* Bind the socket */ - memcpy(iucv->src_name, sa->siucv_name, 8); - - /* Copy the user id */ - memcpy(iucv->src_user_id, iucv_userid, 8); - sk->sk_state = IUCV_BOUND; - err = 0; - + 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 unitialized 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; + 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); @@ -415,29 +779,65 @@ done: static int iucv_sock_autobind(struct sock *sk) { struct iucv_sock *iucv = iucv_sk(sk); - char query_buffer[80]; - char name[12]; int err = 0; - /* Set the userid and name */ - cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err); - if (unlikely(err)) + if (unlikely(!pr_iucv)) return -EPROTO; - memcpy(iucv->src_user_id, query_buffer, 8); + memcpy(iucv->src_user_id, iucv_userid, 8); write_lock_bh(&iucv_sk_list.lock); + __iucv_auto_name(iucv); + write_unlock_bh(&iucv_sk_list.lock); - 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)); - } + if (!iucv->msglimit) + iucv->msglimit = IUCV_QUEUELEN_DEFAULT; - write_unlock_bh(&iucv_sk_list.lock); + return err; +} + +static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) +{ + struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; + struct sock *sk = sock->sk; + struct iucv_sock *iucv = iucv_sk(sk); + unsigned char user_data[16]; + int err; - memcpy(&iucv->src_name, name, 8); + 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; } @@ -447,8 +847,7 @@ static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, { struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; struct sock *sk = sock->sk; - struct iucv_sock *iucv; - unsigned char user_data[16]; + struct iucv_sock *iucv = iucv_sk(sk); int err; if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) @@ -457,10 +856,12 @@ static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) return -EBADFD; - if (sk->sk_type != SOCK_STREAM) - return -EINVAL; + if (sk->sk_state == IUCV_OPEN && + iucv->transport == AF_IUCV_TRANS_HIPER) + return -EBADFD; /* explicit bind required */ - iucv = iucv_sk(sk); + if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) + return -EINVAL; if (sk->sk_state == IUCV_OPEN) { err = iucv_sock_autobind(sk); @@ -471,39 +872,27 @@ static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, lock_sock(sk); /* Set the destination information */ - memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8); - memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8); + memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); + memcpy(iucv->dst_name, sa->siucv_name, 8); - high_nmcpy(user_data, sa->siucv_name); - low_nmcpy(user_data, iucv_sk(sk)->src_name); - ASCEBC(user_data, sizeof(user_data)); - - iucv = iucv_sk(sk); - /* Create path. */ - iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT, - IPRMDATA, GFP_KERNEL); - if (!iucv->path) { - err = -ENOMEM; + 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; - } - err = 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; + + 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; - goto done; - } - if (sk->sk_state != IUCV_CONNECTED) { - err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN, - sock_sndtimeo(sk, flags & O_NONBLOCK)); - } + if (err && iucv->transport == AF_IUCV_TRANS_IUCV) + iucv_sever_path(sk, 0); - if (sk->sk_state == IUCV_DISCONN) { - release_sock(sk); - return -ECONNREFUSED; - } done: release_sock(sk); return err; @@ -518,7 +907,10 @@ static int iucv_sock_listen(struct socket *sock, int backlog) lock_sock(sk); err = -EINVAL; - if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM) + 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; @@ -550,7 +942,7 @@ static int iucv_sock_accept(struct socket *sock, struct socket *newsock, timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); /* Wait for an incoming connection */ - add_wait_queue_exclusive(sk->sk_sleep, &wait); + add_wait_queue_exclusive(sk_sleep(sk), &wait); while (!(nsk = iucv_accept_dequeue(sk, newsock))) { set_current_state(TASK_INTERRUPTIBLE); if (!timeo) { @@ -574,7 +966,7 @@ static int iucv_sock_accept(struct socket *sock, struct socket *newsock, } set_current_state(TASK_RUNNING); - remove_wait_queue(sk->sk_sleep, &wait); + remove_wait_queue(sk_sleep(sk), &wait); if (err) goto done; @@ -591,24 +983,49 @@ static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, { struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; struct sock *sk = sock->sk; + struct iucv_sock *iucv = iucv_sk(sk); addr->sa_family = AF_IUCV; *len = sizeof(struct sockaddr_iucv); if (peer) { - memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8); - memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8); + 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_sk(sk)->src_user_id, 8); - memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8); + 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)); + memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); return 0; } +/** + * 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 kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) { @@ -616,7 +1033,13 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct iucv_sock *iucv = iucv_sk(sk); struct sk_buff *skb; struct iucv_message txmsg; + 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) @@ -625,6 +1048,10 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, 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) { @@ -632,37 +1059,141 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, goto out; } - if (sk->sk_state == IUCV_CONNECTED) { - if (!(skb = sock_alloc_send_skb(sk, len, - msg->msg_flags & MSG_DONTWAIT, - &err))) + /* 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 */ + txmsg.class = 0; + + /* iterate over control messages */ + for (cmsg = CMSG_FIRSTHDR(msg); cmsg; + cmsg = CMSG_NXTHDR(msg, cmsg)) { + + if (!CMSG_OK(msg, cmsg)) { + err = -EINVAL; goto out; + } - if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { - err = -EFAULT; - goto fail; + if (cmsg->cmsg_level != SOL_IUCV) + continue; + + if (cmsg->cmsg_type & cmsg_done) { + err = -EINVAL; + goto out; } + cmsg_done |= cmsg->cmsg_type; - txmsg.class = 0; - memcpy(&txmsg.class, skb->data, skb->len >= 4 ? 4 : skb->len); - txmsg.tag = iucv->send_tag++; - memcpy(skb->cb, &txmsg.tag, 4); - skb_queue_tail(&iucv->send_skb_q, skb); - err = iucv_message_send(iucv->path, &txmsg, 0, 0, - (void *) skb->data, skb->len); + 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; + break; + } + } + + /* 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) + skb = sock_alloc_send_skb(sk, + len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, + noblock, &err); + else + skb = sock_alloc_send_skb(sk, len, noblock, &err); + if (!skb) { + err = -ENOMEM; + goto out; + } + if (iucv->transport == AF_IUCV_TRANS_HIPER) + skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); + if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { + err = -EFAULT; + 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) { - if (err == 3) - printk(KERN_ERR "AF_IUCV msg limit exceeded\n"); + atomic_dec(&iucv->msg_sent); + goto fail; + } + goto release; + } + skb_queue_tail(&iucv->send_skb_q, skb); + + 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) { + skb_unlink(skb, &iucv->send_skb_q); + kfree_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); skb_unlink(skb, &iucv->send_skb_q); err = -EPIPE; goto fail; } - - } else { - err = -ENOTCONN; - goto out; + } else + 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; + skb_unlink(skb, &iucv->send_skb_q); + goto fail; } +release: release_sock(sk); return len; @@ -673,6 +1204,10 @@ out: return err; } +/* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's + * + * Locking: must be called with message_q.lock held + */ static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) { int dataleft, size, copied = 0; @@ -689,6 +1224,10 @@ static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) if (!nskb) return -ENOMEM; + /* copy target class to control buffer of new skb */ + IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class; + + /* copy data fragment */ memcpy(nskb->data, skb->data + copied, size); copied += size; dataleft -= size; @@ -703,42 +1242,66 @@ static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) return 0; } +/* 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; - if (msg->flags & IPRMDATA) { - skb->data = NULL; - skb->len = 0; + /* 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 { - rc = iucv_message_receive(path, msg, 0, skb->data, - msg->length, NULL); + rc = pr_iucv->message_receive(path, msg, + msg->flags & IUCV_IPRMDATA, + skb->data, len, NULL); if (rc) { kfree_skb(skb); return; } - if (skb->truesize >= sk->sk_rcvbuf / 4) { - rc = iucv_fragment_skb(sk, skb, msg->length); + /* we need to fragment iucv messages for SOCK_STREAM only; + * for SOCK_SEQPACKET, it is only relevant if we support + * record segmentation using MSG_EOR (see also recvmsg()) */ + if (sk->sk_type == SOCK_STREAM && + skb->truesize >= sk->sk_rcvbuf / 4) { + rc = iucv_fragment_skb(sk, skb, len); kfree_skb(skb); skb = NULL; if (rc) { - iucv_path_sever(path, NULL); + pr_iucv->path_sever(path, NULL); return; } skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); } else { skb_reset_transport_header(skb); skb_reset_network_header(skb); - skb->len = msg->length; + skb->len = len; } } + IUCV_SKB_CB(skb)->offset = 0; if (sock_queue_rcv_skb(sk, skb)) skb_queue_head(&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); @@ -746,7 +1309,7 @@ static void iucv_process_message_q(struct sock *sk) struct sock_msg_q *p, *n; list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { - skb = alloc_skb(p->msg.length, GFP_ATOMIC | GFP_DMA); + skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); if (!skb) break; iucv_process_message(sk, skb, p->path, &p->msg); @@ -763,11 +1326,12 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, int noblock = flags & MSG_DONTWAIT; struct sock *sk = sock->sk; struct iucv_sock *iucv = iucv_sk(sk); - int target, copied = 0; + unsigned int copied, rlen; struct sk_buff *skb, *rskb, *cskb; int err = 0; + u32 offset; - if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) && + 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)) @@ -776,8 +1340,8 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, if (flags & (MSG_OOB)) return -EOPNOTSUPP; - target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); - + /* 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) @@ -785,32 +1349,66 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, return err; } - copied = min_t(unsigned int, skb->len, len); + 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 (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { - skb_queue_head(&sk->sk_receive_queue, skb); - if (copied == 0) - return -EFAULT; - goto done; + if (skb_copy_datagram_iovec(cskb, offset, msg->msg_iov, copied)) { + if (!(flags & MSG_PEEK)) + skb_queue_head(&sk->sk_receive_queue, skb); + return -EFAULT; } - len -= copied; + /* 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)) { - skb_pull(skb, copied); - if (skb->len) { - skb_queue_head(&sk->sk_receive_queue, skb); - goto done; + /* 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; + } } kfree_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)) { skb_queue_head(&iucv->backlog_skb_q, rskb); @@ -820,17 +1418,26 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, } } if (skb_queue_empty(&iucv->backlog_skb_q)) { - spin_lock_bh(&iucv->message_q.lock); if (!list_empty(&iucv->message_q.list)) iucv_process_message_q(sk); - spin_unlock_bh(&iucv->message_q.lock); + 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); + } + } } - - } else - skb_queue_head(&sk->sk_receive_queue, skb); + spin_unlock_bh(&iucv->message_q.lock); + } done: - return err ? : copied; + /* 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 unsigned int iucv_accept_poll(struct sock *parent) @@ -854,13 +1461,14 @@ unsigned int iucv_sock_poll(struct file *file, struct socket *sock, struct sock *sk = sock->sk; unsigned int mask = 0; - poll_wait(file, sk->sk_sleep, wait); + sock_poll_wait(file, sk_sleep(sk), wait); if (sk->sk_state == IUCV_LISTEN) return iucv_accept_poll(sk); if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) - mask |= POLLERR; + mask |= POLLERR | + (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); if (sk->sk_shutdown & RCV_SHUTDOWN) mask |= POLLRDHUP; @@ -875,10 +1483,10 @@ unsigned int iucv_sock_poll(struct file *file, struct socket *sock, if (sk->sk_state == IUCV_CLOSED) mask |= POLLHUP; - if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) + if (sk->sk_state == IUCV_DISCONN) mask |= POLLIN; - if (sock_writeable(sk)) + if (sock_writeable(sk) && iucv_below_msglim(sk)) mask |= POLLOUT | POLLWRNORM | POLLWRBAND; else set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); @@ -892,7 +1500,6 @@ static int iucv_sock_shutdown(struct socket *sock, int how) struct iucv_sock *iucv = iucv_sk(sk); struct iucv_message txmsg; int err = 0; - u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; how++; @@ -901,40 +1508,47 @@ static int iucv_sock_shutdown(struct socket *sock, int how) lock_sock(sk); switch (sk->sk_state) { + case IUCV_LISTEN: + case IUCV_DISCONN: + case IUCV_CLOSING: case IUCV_CLOSED: err = -ENOTCONN; goto fail; - default: - sk->sk_shutdown |= how; break; } if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { - txmsg.class = 0; - txmsg.tag = 0; - err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0, - (void *) prmmsg, 8); - if (err) { - switch (err) { - case 1: - err = -ENOTCONN; - break; - case 2: - err = -ECONNRESET; - break; - default: - err = -ENOTCONN; - break; + 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) { - err = iucv_path_quiesce(iucv_sk(sk)->path, NULL); - if (err) - err = -ENOTCONN; - + if (iucv->transport == AF_IUCV_TRANS_IUCV) { + 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); } @@ -956,18 +1570,111 @@ static int iucv_sock_release(struct socket *sock) iucv_sock_close(sk); - /* Unregister with IUCV base support */ - if (iucv_sk(sk)->path) { - iucv_path_sever(iucv_sk(sk)->path, NULL); - iucv_path_free(iucv_sk(sk)->path); - iucv_sk(sk)->path = NULL; - } - sock_orphan(sk); iucv_sock_kill(sk); return err; } +/* getsockopt and setsockopt */ +static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, + char __user *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 (get_user(val, (int __user *) optval)) + 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)(~0)) + 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]) @@ -975,7 +1682,6 @@ static int iucv_callback_connreq(struct iucv_path *path, unsigned char user_data[16]; unsigned char nuser_data[16]; unsigned char src_name[8]; - struct hlist_node *node; struct sock *sk, *nsk; struct iucv_sock *iucv, *niucv; int err; @@ -986,7 +1692,7 @@ static int iucv_callback_connreq(struct iucv_path *path, read_lock(&iucv_sk_list.lock); iucv = NULL; sk = NULL; - sk_for_each(sk, node, &iucv_sk_list.head) + sk_for_each(sk, &iucv_sk_list.head) if (sk->sk_state == IUCV_LISTEN && !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { /* @@ -1008,20 +1714,23 @@ static int iucv_callback_connreq(struct iucv_path *path, high_nmcpy(user_data, iucv->dst_name); ASCEBC(user_data, sizeof(user_data)); if (sk->sk_state != IUCV_LISTEN) { - err = iucv_path_sever(path, user_data); + 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 = iucv_path_sever(path, user_data); + err = pr_iucv->path_sever(path, user_data); + iucv_path_free(path); goto fail; } /* Create the new socket */ - nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC); + nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); if (!nsk) { - err = iucv_path_sever(path, user_data); + err = pr_iucv->path_sever(path, user_data); + iucv_path_free(path); goto fail; } @@ -1041,10 +1750,13 @@ static int iucv_callback_connreq(struct iucv_path *path, memcpy(nuser_data + 8, niucv->src_name, 8); ASCEBC(nuser_data + 8, 8); - path->msglim = IUCV_QUEUELEN_DEFAULT; - err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk); + /* 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) { - err = iucv_path_sever(path, user_data); + iucv_sever_path(nsk, 1); + iucv_sock_kill(nsk); goto fail; } @@ -1052,7 +1764,7 @@ static int iucv_callback_connreq(struct iucv_path *path, /* Wake up accept */ nsk->sk_state = IUCV_CONNECTED; - sk->sk_data_ready(sk, 1); + sk->sk_data_ready(sk); err = 0; fail: bh_unlock_sock(sk); @@ -1075,37 +1787,39 @@ static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) struct sock_msg_q *save_msg; int len; - if (sk->sk_shutdown & RCV_SHUTDOWN) + 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 += msg->length + sizeof(struct sk_buff); + len += SKB_TRUESIZE(iucv_msg_length(msg)); if (len > sk->sk_rcvbuf) goto save_message; - skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA); + skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); if (!skb) goto save_message; - spin_lock(&iucv->message_q.lock); iucv_process_message(sk, skb, path, msg); - spin_unlock(&iucv->message_q.lock); - - return; + goto out_unlock; save_message: save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); if (!save_msg) - return; + goto out_unlock; save_msg->path = path; save_msg->msg = *msg; - spin_lock(&iucv->message_q.lock); list_add_tail(&save_msg->list, &iucv->message_q.list); + +out_unlock: spin_unlock(&iucv->message_q.lock); } @@ -1118,11 +1832,12 @@ static void iucv_callback_txdone(struct iucv_path *path, struct sk_buff *list_skb = list->next; unsigned long flags; + bh_lock_sock(sk); if (!skb_queue_empty(list)) { spin_lock_irqsave(&list->lock, flags); while (list_skb != (struct sk_buff *)list) { - if (!memcmp(&msg->tag, list_skb->cb, 4)) { + if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { this = list_skb; break; } @@ -1133,10 +1848,12 @@ static void iucv_callback_txdone(struct iucv_path *path, spin_unlock_irqrestore(&list->lock, flags); - if (this) + if (this) { kfree_skb(this); + /* wake up any process waiting for sending */ + iucv_sock_wake_msglim(sk); + } } - BUG_ON(!this); if (sk->sk_state == IUCV_CLOSING) { if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { @@ -1144,6 +1861,7 @@ static void iucv_callback_txdone(struct iucv_path *path, sk->sk_state_change(sk); } } + bh_unlock_sock(sk); } @@ -1151,15 +1869,466 @@ static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) { struct sock *sk = path->private; - if (!list_empty(&iucv_sk(sk)->accept_q)) - sk->sk_state = IUCV_SEVERED; + 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); +} + +/***************** HiperSockets transport callbacks ********************/ +static void afiucv_swap_src_dest(struct sk_buff *skb) +{ + struct af_iucv_trans_hdr *trans_hdr = + (struct af_iucv_trans_hdr *)skb->data; + 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 sock *nsk; + struct iucv_sock *iucv, *niucv; + struct af_iucv_trans_hdr *trans_hdr; + int err; + + iucv = iucv_sk(sk); + trans_hdr = (struct af_iucv_trans_hdr *)skb->data; + 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_type, GFP_ATOMIC); + 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 - sk->sk_state = IUCV_DISCONN; + 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); + struct af_iucv_trans_hdr *trans_hdr = + (struct af_iucv_trans_hdr *)skb->data; + if (!iucv) + goto out; + if (sk->sk_state != IUCV_BOUND) + goto out; + bh_lock_sock(sk); + iucv->msglimit_peer = trans_hdr->window; + sk->sk_state = IUCV_CONNECTED; sk->sk_state_change(sk); + bh_unlock_sock(sk); +out: + kfree_skb(skb); + return NET_RX_SUCCESS; } -static struct proto_ops iucv_sock_ops = { +/** + * 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) + goto out; + if (sk->sk_state != IUCV_BOUND) + goto out; + bh_lock_sock(sk); + sk->sk_state = IUCV_DISCONN; + sk->sk_state_change(sk); + bh_unlock_sock(sk); +out: + kfree_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) + goto out; + bh_lock_sock(sk); + if (sk->sk_state == IUCV_CONNECTED) { + sk->sk_state = IUCV_DISCONN; + sk->sk_state_change(sk); + } + bh_unlock_sock(sk); +out: + kfree_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); + struct af_iucv_trans_hdr *trans_hdr = + (struct af_iucv_trans_hdr *)skb->data; + + if (!iucv) + return NET_RX_SUCCESS; + + if (sk->sk_state != IUCV_CONNECTED) + return NET_RX_SUCCESS; + + atomic_sub(trans_hdr->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 */ + if (skb->len < sizeof(struct af_iucv_trans_hdr)) { + kfree_skb(skb); + return NET_RX_SUCCESS; + } + 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; + 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; + char nullstring[8]; + int err = 0; + + skb_pull(skb, ETH_HLEN); + trans_hdr = (struct af_iucv_trans_hdr *)skb->data; + 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)) { + kfree_skb(skb); + break; + } + /* fall through and receive non-zero length data */ + case (AF_IUCV_FLAG_SHT): + /* shutdown request */ + /* fall through 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: + ; + } + + return err; +} + +/** + * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets + * transport + **/ +static void afiucv_hs_callback_txnotify(struct sk_buff *skb, + enum iucv_tx_notify n) +{ + struct sock *isk = skb->sk; + struct sock *sk = NULL; + struct iucv_sock *iucv = NULL; + struct sk_buff_head *list; + struct sk_buff *list_skb; + struct sk_buff *nskb; + unsigned long flags; + + read_lock_irqsave(&iucv_sk_list.lock, flags); + sk_for_each(sk, &iucv_sk_list.head) + if (sk == isk) { + iucv = iucv_sk(sk); + break; + } + read_unlock_irqrestore(&iucv_sk_list.lock, flags); + + if (!iucv || sock_flag(sk, SOCK_ZAPPED)) + return; + + list = &iucv->send_skb_q; + spin_lock_irqsave(&list->lock, flags); + if (skb_queue_empty(list)) + goto out_unlock; + list_skb = list->next; + nskb = list_skb->next; + while (list_skb != (struct sk_buff *)list) { + if (skb_shinfo(list_skb) == skb_shinfo(skb)) { + switch (n) { + case TX_NOTIFY_OK: + __skb_unlink(list_skb, list); + kfree_skb(list_skb); + iucv_sock_wake_msglim(sk); + break; + case TX_NOTIFY_PENDING: + atomic_inc(&iucv->pendings); + break; + case TX_NOTIFY_DELAYED_OK: + __skb_unlink(list_skb, list); + atomic_dec(&iucv->pendings); + if (atomic_read(&iucv->pendings) <= 0) + iucv_sock_wake_msglim(sk); + kfree_skb(list_skb); + break; + case TX_NOTIFY_UNREACHABLE: + case TX_NOTIFY_DELAYED_UNREACHABLE: + case TX_NOTIFY_TPQFULL: /* not yet used */ + case TX_NOTIFY_GENERALERROR: + case TX_NOTIFY_DELAYED_GENERALERROR: + __skb_unlink(list_skb, list); + kfree_skb(list_skb); + if (sk->sk_state == IUCV_CONNECTED) { + sk->sk_state = IUCV_DISCONN; + sk->sk_state_change(sk); + } + break; + } + break; + } + list_skb = nskb; + nskb = nskb->next; + } +out_unlock: + spin_unlock_irqrestore(&list->lock, flags); + + if (sk->sk_state == IUCV_CLOSING) { + if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { + 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, @@ -1175,56 +2344,116 @@ static struct proto_ops iucv_sock_ops = { .mmap = sock_no_mmap, .socketpair = sock_no_socketpair, .shutdown = iucv_sock_shutdown, - .setsockopt = sock_no_setsockopt, - .getsockopt = sock_no_getsockopt + .setsockopt = iucv_sock_setsockopt, + .getsockopt = iucv_sock_getsockopt, }; -static struct net_proto_family iucv_sock_family_ops = { +static const struct net_proto_family iucv_sock_family_ops = { .family = AF_IUCV, .owner = THIS_MODULE, .create = iucv_sock_create, }; -static int __init afiucv_init(void) +static struct packet_type iucv_packet_type = { + .type = cpu_to_be16(ETH_P_AF_IUCV), + .func = afiucv_hs_rcv, +}; + +static int afiucv_iucv_init(void) { int err; - if (!MACHINE_IS_VM) { - printk(KERN_ERR "AF_IUCV connection needs VM as base\n"); - err = -EPROTONOSUPPORT; + err = pr_iucv->iucv_register(&af_iucv_handler, 0); + if (err) goto out; + /* establish dummy device */ + af_iucv_driver.bus = pr_iucv->bus; + err = driver_register(&af_iucv_driver); + if (err) + goto out_iucv; + af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); + if (!af_iucv_dev) { + err = -ENOMEM; + goto out_driver; } - cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); - if (unlikely(err)) { - WARN_ON(err); - err = -EPROTONOSUPPORT; - goto out; + dev_set_name(af_iucv_dev, "af_iucv"); + af_iucv_dev->bus = pr_iucv->bus; + af_iucv_dev->parent = pr_iucv->root; + af_iucv_dev->release = (void (*)(struct device *))kfree; + af_iucv_dev->driver = &af_iucv_driver; + err = device_register(af_iucv_dev); + if (err) + goto out_driver; + return 0; + +out_driver: + driver_unregister(&af_iucv_driver); +out_iucv: + pr_iucv->iucv_unregister(&af_iucv_handler, 0); +out: + return err; +} + +static int __init afiucv_init(void) +{ + int err; + + if (MACHINE_IS_VM) { + cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); + if (unlikely(err)) { + WARN_ON(err); + err = -EPROTONOSUPPORT; + goto out; + } + + pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); + if (!pr_iucv) { + printk(KERN_WARNING "iucv_if lookup failed\n"); + memset(&iucv_userid, 0, sizeof(iucv_userid)); + } + } else { + memset(&iucv_userid, 0, sizeof(iucv_userid)); + pr_iucv = NULL; } - err = iucv_register(&af_iucv_handler, 0); - if (err) - goto out; err = proto_register(&iucv_proto, 0); if (err) - goto out_iucv; + goto out; err = sock_register(&iucv_sock_family_ops); if (err) goto out_proto; + + if (pr_iucv) { + err = afiucv_iucv_init(); + if (err) + goto out_sock; + } else + register_netdevice_notifier(&afiucv_netdev_notifier); + dev_add_pack(&iucv_packet_type); return 0; +out_sock: + sock_unregister(PF_IUCV); out_proto: proto_unregister(&iucv_proto); -out_iucv: - iucv_unregister(&af_iucv_handler, 0); out: + if (pr_iucv) + symbol_put(iucv_if); return err; } static void __exit afiucv_exit(void) { + if (pr_iucv) { + device_unregister(af_iucv_dev); + driver_unregister(&af_iucv_driver); + pr_iucv->iucv_unregister(&af_iucv_handler, 0); + symbol_put(iucv_if); + } else + unregister_netdevice_notifier(&afiucv_netdev_notifier); + dev_remove_pack(&iucv_packet_type); sock_unregister(PF_IUCV); proto_unregister(&iucv_proto); - iucv_unregister(&af_iucv_handler, 0); } module_init(afiucv_init); @@ -1235,3 +2464,4 @@ MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); MODULE_VERSION(VERSION); MODULE_LICENSE("GPL"); MODULE_ALIAS_NETPROTO(PF_IUCV); + |