2353 lines
56 KiB
C
2353 lines
56 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* IUCV protocol stack for Linux on zSeries
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*
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* Copyright IBM Corp. 2006, 2009
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*
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* Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
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* Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
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* PM functions:
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* Ursula Braun <ursula.braun@de.ibm.com>
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*/
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#define KMSG_COMPONENT "af_iucv"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/limits.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched/signal.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/security.h>
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#include <net/sock.h>
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#include <asm/ebcdic.h>
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#include <asm/cpcmd.h>
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#include <linux/kmod.h>
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#include <net/iucv/af_iucv.h>
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#define VERSION "1.2"
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static char iucv_userid[80];
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static struct proto iucv_proto = {
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.name = "AF_IUCV",
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.owner = THIS_MODULE,
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.obj_size = sizeof(struct iucv_sock),
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};
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static struct iucv_interface *pr_iucv;
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static struct iucv_handler af_iucv_handler;
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/* special AF_IUCV IPRM messages */
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static const u8 iprm_shutdown[8] =
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{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
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#define TRGCLS_SIZE sizeof_field(struct iucv_message, class)
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#define __iucv_sock_wait(sk, condition, timeo, ret) \
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do { \
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DEFINE_WAIT(__wait); \
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long __timeo = timeo; \
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ret = 0; \
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prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
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while (!(condition)) { \
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if (!__timeo) { \
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ret = -EAGAIN; \
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break; \
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} \
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if (signal_pending(current)) { \
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ret = sock_intr_errno(__timeo); \
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break; \
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} \
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release_sock(sk); \
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__timeo = schedule_timeout(__timeo); \
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lock_sock(sk); \
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ret = sock_error(sk); \
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if (ret) \
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break; \
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} \
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finish_wait(sk_sleep(sk), &__wait); \
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} while (0)
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#define iucv_sock_wait(sk, condition, timeo) \
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({ \
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int __ret = 0; \
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if (!(condition)) \
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__iucv_sock_wait(sk, condition, timeo, __ret); \
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__ret; \
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})
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static struct sock *iucv_accept_dequeue(struct sock *parent,
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struct socket *newsock);
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static void iucv_sock_kill(struct sock *sk);
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static void iucv_sock_close(struct sock *sk);
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static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify);
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static struct iucv_sock_list iucv_sk_list = {
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.lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
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.autobind_name = ATOMIC_INIT(0)
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};
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static inline void high_nmcpy(unsigned char *dst, char *src)
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{
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memcpy(dst, src, 8);
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}
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static inline void low_nmcpy(unsigned char *dst, char *src)
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{
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memcpy(&dst[8], src, 8);
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}
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/**
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* iucv_msg_length() - Returns the length of an iucv message.
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* @msg: Pointer to struct iucv_message, MUST NOT be NULL
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*
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* The function returns the length of the specified iucv message @msg of data
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* stored in a buffer and of data stored in the parameter list (PRMDATA).
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*
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* For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
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* data:
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* PRMDATA[0..6] socket data (max 7 bytes);
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* PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
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*
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* The socket data length is computed by subtracting the socket data length
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* value from 0xFF.
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* If the socket data len is greater 7, then PRMDATA can be used for special
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* notifications (see iucv_sock_shutdown); and further,
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* if the socket data len is > 7, the function returns 8.
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*
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* Use this function to allocate socket buffers to store iucv message data.
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*/
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static inline size_t iucv_msg_length(struct iucv_message *msg)
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{
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size_t datalen;
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if (msg->flags & IUCV_IPRMDATA) {
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datalen = 0xff - msg->rmmsg[7];
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return (datalen < 8) ? datalen : 8;
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}
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return msg->length;
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}
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/**
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* iucv_sock_in_state() - check for specific states
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* @sk: sock structure
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* @state: first iucv sk state
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* @state: second iucv sk state
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*
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* Returns true if the socket in either in the first or second state.
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*/
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static int iucv_sock_in_state(struct sock *sk, int state, int state2)
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{
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return (sk->sk_state == state || sk->sk_state == state2);
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}
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/**
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* iucv_below_msglim() - function to check if messages can be sent
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* @sk: sock structure
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*
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* Returns true if the send queue length is lower than the message limit.
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* Always returns true if the socket is not connected (no iucv path for
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* checking the message limit).
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*/
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static inline int iucv_below_msglim(struct sock *sk)
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{
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struct iucv_sock *iucv = iucv_sk(sk);
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if (sk->sk_state != IUCV_CONNECTED)
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return 1;
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if (iucv->transport == AF_IUCV_TRANS_IUCV)
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return (atomic_read(&iucv->skbs_in_xmit) < iucv->path->msglim);
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else
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return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
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(atomic_read(&iucv->pendings) <= 0));
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}
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/**
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* iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
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*/
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static void iucv_sock_wake_msglim(struct sock *sk)
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{
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struct socket_wq *wq;
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rcu_read_lock();
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wq = rcu_dereference(sk->sk_wq);
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if (skwq_has_sleeper(wq))
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wake_up_interruptible_all(&wq->wait);
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sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
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rcu_read_unlock();
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}
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/**
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* afiucv_hs_send() - send a message through HiperSockets transport
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*/
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static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
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struct sk_buff *skb, u8 flags)
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{
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struct iucv_sock *iucv = iucv_sk(sock);
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struct af_iucv_trans_hdr *phs_hdr;
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int err, confirm_recv = 0;
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phs_hdr = skb_push(skb, sizeof(*phs_hdr));
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memset(phs_hdr, 0, sizeof(*phs_hdr));
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skb_reset_network_header(skb);
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phs_hdr->magic = ETH_P_AF_IUCV;
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phs_hdr->version = 1;
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phs_hdr->flags = flags;
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if (flags == AF_IUCV_FLAG_SYN)
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phs_hdr->window = iucv->msglimit;
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else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
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confirm_recv = atomic_read(&iucv->msg_recv);
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phs_hdr->window = confirm_recv;
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if (confirm_recv)
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phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
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}
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memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
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memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
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memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
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memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
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ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
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ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
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ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
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ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
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if (imsg)
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memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
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skb->dev = iucv->hs_dev;
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if (!skb->dev) {
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err = -ENODEV;
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goto err_free;
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}
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dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len);
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if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
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err = -ENETDOWN;
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goto err_free;
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}
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if (skb->len > skb->dev->mtu) {
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if (sock->sk_type == SOCK_SEQPACKET) {
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err = -EMSGSIZE;
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goto err_free;
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}
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err = pskb_trim(skb, skb->dev->mtu);
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if (err)
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goto err_free;
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}
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skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
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atomic_inc(&iucv->skbs_in_xmit);
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err = dev_queue_xmit(skb);
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if (net_xmit_eval(err)) {
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atomic_dec(&iucv->skbs_in_xmit);
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} else {
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atomic_sub(confirm_recv, &iucv->msg_recv);
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WARN_ON(atomic_read(&iucv->msg_recv) < 0);
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}
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return net_xmit_eval(err);
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err_free:
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kfree_skb(skb);
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return err;
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}
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static struct sock *__iucv_get_sock_by_name(char *nm)
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{
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struct sock *sk;
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sk_for_each(sk, &iucv_sk_list.head)
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if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
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return sk;
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return NULL;
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}
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static void iucv_sock_destruct(struct sock *sk)
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{
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skb_queue_purge(&sk->sk_receive_queue);
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skb_queue_purge(&sk->sk_error_queue);
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sk_mem_reclaim(sk);
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if (!sock_flag(sk, SOCK_DEAD)) {
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pr_err("Attempt to release alive iucv socket %p\n", sk);
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return;
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}
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WARN_ON(atomic_read(&sk->sk_rmem_alloc));
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WARN_ON(refcount_read(&sk->sk_wmem_alloc));
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WARN_ON(sk->sk_wmem_queued);
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WARN_ON(sk->sk_forward_alloc);
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}
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/* Cleanup Listen */
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static void iucv_sock_cleanup_listen(struct sock *parent)
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{
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struct sock *sk;
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/* Close non-accepted connections */
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while ((sk = iucv_accept_dequeue(parent, NULL))) {
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iucv_sock_close(sk);
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iucv_sock_kill(sk);
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}
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parent->sk_state = IUCV_CLOSED;
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}
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static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
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{
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write_lock_bh(&l->lock);
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sk_add_node(sk, &l->head);
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write_unlock_bh(&l->lock);
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}
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static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
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{
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write_lock_bh(&l->lock);
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sk_del_node_init(sk);
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write_unlock_bh(&l->lock);
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}
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/* Kill socket (only if zapped and orphaned) */
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static void iucv_sock_kill(struct sock *sk)
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{
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if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
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return;
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iucv_sock_unlink(&iucv_sk_list, sk);
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sock_set_flag(sk, SOCK_DEAD);
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sock_put(sk);
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}
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/* Terminate an IUCV path */
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static void iucv_sever_path(struct sock *sk, int with_user_data)
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{
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unsigned char user_data[16];
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struct iucv_sock *iucv = iucv_sk(sk);
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struct iucv_path *path = iucv->path;
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if (iucv->path) {
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iucv->path = NULL;
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if (with_user_data) {
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low_nmcpy(user_data, iucv->src_name);
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high_nmcpy(user_data, iucv->dst_name);
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ASCEBC(user_data, sizeof(user_data));
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pr_iucv->path_sever(path, user_data);
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} else
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pr_iucv->path_sever(path, NULL);
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iucv_path_free(path);
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}
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}
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/* Send controlling flags through an IUCV socket for HIPER transport */
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static int iucv_send_ctrl(struct sock *sk, u8 flags)
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{
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struct iucv_sock *iucv = iucv_sk(sk);
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int err = 0;
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int blen;
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struct sk_buff *skb;
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u8 shutdown = 0;
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blen = sizeof(struct af_iucv_trans_hdr) +
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LL_RESERVED_SPACE(iucv->hs_dev);
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if (sk->sk_shutdown & SEND_SHUTDOWN) {
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/* controlling flags should be sent anyway */
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shutdown = sk->sk_shutdown;
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sk->sk_shutdown &= RCV_SHUTDOWN;
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}
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skb = sock_alloc_send_skb(sk, blen, 1, &err);
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if (skb) {
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skb_reserve(skb, blen);
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err = afiucv_hs_send(NULL, sk, skb, flags);
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}
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if (shutdown)
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sk->sk_shutdown = shutdown;
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return err;
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}
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/* Close an IUCV socket */
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static void iucv_sock_close(struct sock *sk)
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{
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struct iucv_sock *iucv = iucv_sk(sk);
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unsigned long timeo;
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int err = 0;
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lock_sock(sk);
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switch (sk->sk_state) {
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case IUCV_LISTEN:
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iucv_sock_cleanup_listen(sk);
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break;
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case IUCV_CONNECTED:
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if (iucv->transport == AF_IUCV_TRANS_HIPER) {
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err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
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sk->sk_state = IUCV_DISCONN;
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sk->sk_state_change(sk);
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}
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fallthrough;
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case IUCV_DISCONN:
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sk->sk_state = IUCV_CLOSING;
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sk->sk_state_change(sk);
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if (!err && atomic_read(&iucv->skbs_in_xmit) > 0) {
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if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
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timeo = sk->sk_lingertime;
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else
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timeo = IUCV_DISCONN_TIMEOUT;
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iucv_sock_wait(sk,
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iucv_sock_in_state(sk, IUCV_CLOSED, 0),
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timeo);
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}
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fallthrough;
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case IUCV_CLOSING:
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sk->sk_state = IUCV_CLOSED;
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sk->sk_state_change(sk);
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sk->sk_err = ECONNRESET;
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sk->sk_state_change(sk);
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skb_queue_purge(&iucv->send_skb_q);
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skb_queue_purge(&iucv->backlog_skb_q);
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fallthrough;
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default:
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iucv_sever_path(sk, 1);
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}
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if (iucv->hs_dev) {
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dev_put(iucv->hs_dev);
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iucv->hs_dev = NULL;
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sk->sk_bound_dev_if = 0;
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}
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/* mark socket for deletion by iucv_sock_kill() */
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sock_set_flag(sk, SOCK_ZAPPED);
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release_sock(sk);
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}
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static void iucv_sock_init(struct sock *sk, struct sock *parent)
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{
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if (parent) {
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sk->sk_type = parent->sk_type;
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security_sk_clone(parent, sk);
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}
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}
|
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static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
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{
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struct sock *sk;
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struct iucv_sock *iucv;
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sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
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if (!sk)
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return NULL;
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iucv = iucv_sk(sk);
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sock_init_data(sock, sk);
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INIT_LIST_HEAD(&iucv->accept_q);
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spin_lock_init(&iucv->accept_q_lock);
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skb_queue_head_init(&iucv->send_skb_q);
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INIT_LIST_HEAD(&iucv->message_q.list);
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spin_lock_init(&iucv->message_q.lock);
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skb_queue_head_init(&iucv->backlog_skb_q);
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iucv->send_tag = 0;
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atomic_set(&iucv->pendings, 0);
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iucv->flags = 0;
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iucv->msglimit = 0;
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atomic_set(&iucv->skbs_in_xmit, 0);
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atomic_set(&iucv->msg_sent, 0);
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atomic_set(&iucv->msg_recv, 0);
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iucv->path = NULL;
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iucv->sk_txnotify = afiucv_hs_callback_txnotify;
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memset(&iucv->src_user_id , 0, 32);
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if (pr_iucv)
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iucv->transport = AF_IUCV_TRANS_IUCV;
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else
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iucv->transport = AF_IUCV_TRANS_HIPER;
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sk->sk_destruct = iucv_sock_destruct;
|
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sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
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|
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sock_reset_flag(sk, SOCK_ZAPPED);
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|
|
|
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 afiucv_iucv_init(void)
|
|
{
|
|
return pr_iucv->iucv_register(&af_iucv_handler, 0);
|
|
}
|
|
|
|
static void afiucv_iucv_exit(void)
|
|
{
|
|
pr_iucv->iucv_unregister(&af_iucv_handler, 0);
|
|
}
|
|
|
|
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 = 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 = afiucv_iucv_init();
|
|
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)
|
|
afiucv_iucv_exit();
|
|
out_sock:
|
|
sock_unregister(PF_IUCV);
|
|
out_proto:
|
|
proto_unregister(&iucv_proto);
|
|
out:
|
|
if (pr_iucv)
|
|
symbol_put(iucv_if);
|
|
return err;
|
|
}
|
|
|
|
static void __exit afiucv_exit(void)
|
|
{
|
|
if (pr_iucv) {
|
|
afiucv_iucv_exit();
|
|
symbol_put(iucv_if);
|
|
}
|
|
|
|
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);
|