+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * DECnet An implementation of the DECnet protocol suite for the LINUX
- * operating system. DECnet is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * DECnet Network Services Protocol (Input)
- *
- * Author: Eduardo Marcelo Serrat <emserrat@geocities.com>
- *
- * Changes:
- *
- * Steve Whitehouse: Split into dn_nsp_in.c and dn_nsp_out.c from
- * original dn_nsp.c.
- * Steve Whitehouse: Updated to work with my new routing architecture.
- * Steve Whitehouse: Add changes from Eduardo Serrat's patches.
- * Steve Whitehouse: Put all ack handling code in a common routine.
- * Steve Whitehouse: Put other common bits into dn_nsp_rx()
- * Steve Whitehouse: More checks on skb->len to catch bogus packets
- * Fixed various race conditions and possible nasties.
- * Steve Whitehouse: Now handles returned conninit frames.
- * David S. Miller: New socket locking
- * Steve Whitehouse: Fixed lockup when socket filtering was enabled.
- * Paul Koning: Fix to push CC sockets into RUN when acks are
- * received.
- * Steve Whitehouse:
- * Patrick Caulfield: Checking conninits for correctness & sending of error
- * responses.
- * Steve Whitehouse: Added backlog congestion level return codes.
- * Patrick Caulfield:
- * Steve Whitehouse: Added flow control support (outbound)
- * Steve Whitehouse: Prepare for nonlinear skbs
- */
-
-/******************************************************************************
- (c) 1995-1998 E.M. Serrat emserrat@geocities.com
-
-*******************************************************************************/
-
-#include <linux/errno.h>
-#include <linux/filter.h>
-#include <linux/types.h>
-#include <linux/socket.h>
-#include <linux/in.h>
-#include <linux/kernel.h>
-#include <linux/timer.h>
-#include <linux/string.h>
-#include <linux/sockios.h>
-#include <linux/net.h>
-#include <linux/netdevice.h>
-#include <linux/inet.h>
-#include <linux/route.h>
-#include <linux/slab.h>
-#include <net/sock.h>
-#include <net/tcp_states.h>
-#include <linux/fcntl.h>
-#include <linux/mm.h>
-#include <linux/termios.h>
-#include <linux/interrupt.h>
-#include <linux/proc_fs.h>
-#include <linux/stat.h>
-#include <linux/init.h>
-#include <linux/poll.h>
-#include <linux/netfilter_decnet.h>
-#include <net/neighbour.h>
-#include <net/dst.h>
-#include <net/dn.h>
-#include <net/dn_nsp.h>
-#include <net/dn_dev.h>
-#include <net/dn_route.h>
-
-extern int decnet_log_martians;
-
-static void dn_log_martian(struct sk_buff *skb, const char *msg)
-{
- if (decnet_log_martians) {
- char *devname = skb->dev ? skb->dev->name : "???";
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
- net_info_ratelimited("DECnet: Martian packet (%s) dev=%s src=0x%04hx dst=0x%04hx srcport=0x%04hx dstport=0x%04hx\n",
- msg, devname,
- le16_to_cpu(cb->src),
- le16_to_cpu(cb->dst),
- le16_to_cpu(cb->src_port),
- le16_to_cpu(cb->dst_port));
- }
-}
-
-/*
- * For this function we've flipped the cross-subchannel bit
- * if the message is an otherdata or linkservice message. Thus
- * we can use it to work out what to update.
- */
-static void dn_ack(struct sock *sk, struct sk_buff *skb, unsigned short ack)
-{
- struct dn_scp *scp = DN_SK(sk);
- unsigned short type = ((ack >> 12) & 0x0003);
- int wakeup = 0;
-
- switch (type) {
- case 0: /* ACK - Data */
- if (dn_after(ack, scp->ackrcv_dat)) {
- scp->ackrcv_dat = ack & 0x0fff;
- wakeup |= dn_nsp_check_xmit_queue(sk, skb,
- &scp->data_xmit_queue,
- ack);
- }
- break;
- case 1: /* NAK - Data */
- break;
- case 2: /* ACK - OtherData */
- if (dn_after(ack, scp->ackrcv_oth)) {
- scp->ackrcv_oth = ack & 0x0fff;
- wakeup |= dn_nsp_check_xmit_queue(sk, skb,
- &scp->other_xmit_queue,
- ack);
- }
- break;
- case 3: /* NAK - OtherData */
- break;
- }
-
- if (wakeup && !sock_flag(sk, SOCK_DEAD))
- sk->sk_state_change(sk);
-}
-
-/*
- * This function is a universal ack processor.
- */
-static int dn_process_ack(struct sock *sk, struct sk_buff *skb, int oth)
-{
- __le16 *ptr = (__le16 *)skb->data;
- int len = 0;
- unsigned short ack;
-
- if (skb->len < 2)
- return len;
-
- if ((ack = le16_to_cpu(*ptr)) & 0x8000) {
- skb_pull(skb, 2);
- ptr++;
- len += 2;
- if ((ack & 0x4000) == 0) {
- if (oth)
- ack ^= 0x2000;
- dn_ack(sk, skb, ack);
- }
- }
-
- if (skb->len < 2)
- return len;
-
- if ((ack = le16_to_cpu(*ptr)) & 0x8000) {
- skb_pull(skb, 2);
- len += 2;
- if ((ack & 0x4000) == 0) {
- if (oth)
- ack ^= 0x2000;
- dn_ack(sk, skb, ack);
- }
- }
-
- return len;
-}
-
-
-/**
- * dn_check_idf - Check an image data field format is correct.
- * @pptr: Pointer to pointer to image data
- * @len: Pointer to length of image data
- * @max: The maximum allowed length of the data in the image data field
- * @follow_on: Check that this many bytes exist beyond the end of the image data
- *
- * Returns: 0 if ok, -1 on error
- */
-static inline int dn_check_idf(unsigned char **pptr, int *len, unsigned char max, unsigned char follow_on)
-{
- unsigned char *ptr = *pptr;
- unsigned char flen = *ptr++;
-
- (*len)--;
- if (flen > max)
- return -1;
- if ((flen + follow_on) > *len)
- return -1;
-
- *len -= flen;
- *pptr = ptr + flen;
- return 0;
-}
-
-/*
- * Table of reason codes to pass back to node which sent us a badly
- * formed message, plus text messages for the log. A zero entry in
- * the reason field means "don't reply" otherwise a disc init is sent with
- * the specified reason code.
- */
-static struct {
- unsigned short reason;
- const char *text;
-} ci_err_table[] = {
- { 0, "CI: Truncated message" },
- { NSP_REASON_ID, "CI: Destination username error" },
- { NSP_REASON_ID, "CI: Destination username type" },
- { NSP_REASON_US, "CI: Source username error" },
- { 0, "CI: Truncated at menuver" },
- { 0, "CI: Truncated before access or user data" },
- { NSP_REASON_IO, "CI: Access data format error" },
- { NSP_REASON_IO, "CI: User data format error" }
-};
-
-/*
- * This function uses a slightly different lookup method
- * to find its sockets, since it searches on object name/number
- * rather than port numbers. Various tests are done to ensure that
- * the incoming data is in the correct format before it is queued to
- * a socket.
- */
-static struct sock *dn_find_listener(struct sk_buff *skb, unsigned short *reason)
-{
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
- struct nsp_conn_init_msg *msg = (struct nsp_conn_init_msg *)skb->data;
- struct sockaddr_dn dstaddr;
- struct sockaddr_dn srcaddr;
- unsigned char type = 0;
- int dstlen;
- int srclen;
- unsigned char *ptr;
- int len;
- int err = 0;
- unsigned char menuver;
-
- memset(&dstaddr, 0, sizeof(struct sockaddr_dn));
- memset(&srcaddr, 0, sizeof(struct sockaddr_dn));
-
- /*
- * 1. Decode & remove message header
- */
- cb->src_port = msg->srcaddr;
- cb->dst_port = msg->dstaddr;
- cb->services = msg->services;
- cb->info = msg->info;
- cb->segsize = le16_to_cpu(msg->segsize);
-
- if (!pskb_may_pull(skb, sizeof(*msg)))
- goto err_out;
-
- skb_pull(skb, sizeof(*msg));
-
- len = skb->len;
- ptr = skb->data;
-
- /*
- * 2. Check destination end username format
- */
- dstlen = dn_username2sockaddr(ptr, len, &dstaddr, &type);
- err++;
- if (dstlen < 0)
- goto err_out;
-
- err++;
- if (type > 1)
- goto err_out;
-
- len -= dstlen;
- ptr += dstlen;
-
- /*
- * 3. Check source end username format
- */
- srclen = dn_username2sockaddr(ptr, len, &srcaddr, &type);
- err++;
- if (srclen < 0)
- goto err_out;
-
- len -= srclen;
- ptr += srclen;
- err++;
- if (len < 1)
- goto err_out;
-
- menuver = *ptr;
- ptr++;
- len--;
-
- /*
- * 4. Check that optional data actually exists if menuver says it does
- */
- err++;
- if ((menuver & (DN_MENUVER_ACC | DN_MENUVER_USR)) && (len < 1))
- goto err_out;
-
- /*
- * 5. Check optional access data format
- */
- err++;
- if (menuver & DN_MENUVER_ACC) {
- if (dn_check_idf(&ptr, &len, 39, 1))
- goto err_out;
- if (dn_check_idf(&ptr, &len, 39, 1))
- goto err_out;
- if (dn_check_idf(&ptr, &len, 39, (menuver & DN_MENUVER_USR) ? 1 : 0))
- goto err_out;
- }
-
- /*
- * 6. Check optional user data format
- */
- err++;
- if (menuver & DN_MENUVER_USR) {
- if (dn_check_idf(&ptr, &len, 16, 0))
- goto err_out;
- }
-
- /*
- * 7. Look up socket based on destination end username
- */
- return dn_sklist_find_listener(&dstaddr);
-err_out:
- dn_log_martian(skb, ci_err_table[err].text);
- *reason = ci_err_table[err].reason;
- return NULL;
-}
-
-
-static void dn_nsp_conn_init(struct sock *sk, struct sk_buff *skb)
-{
- if (sk_acceptq_is_full(sk)) {
- kfree_skb(skb);
- return;
- }
-
- sk_acceptq_added(sk);
- skb_queue_tail(&sk->sk_receive_queue, skb);
- sk->sk_state_change(sk);
-}
-
-static void dn_nsp_conn_conf(struct sock *sk, struct sk_buff *skb)
-{
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
- struct dn_scp *scp = DN_SK(sk);
- unsigned char *ptr;
-
- if (skb->len < 4)
- goto out;
-
- ptr = skb->data;
- cb->services = *ptr++;
- cb->info = *ptr++;
- cb->segsize = le16_to_cpu(*(__le16 *)ptr);
-
- if ((scp->state == DN_CI) || (scp->state == DN_CD)) {
- scp->persist = 0;
- scp->addrrem = cb->src_port;
- sk->sk_state = TCP_ESTABLISHED;
- scp->state = DN_RUN;
- scp->services_rem = cb->services;
- scp->info_rem = cb->info;
- scp->segsize_rem = cb->segsize;
-
- if ((scp->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
- scp->max_window = decnet_no_fc_max_cwnd;
-
- if (skb->len > 0) {
- u16 dlen = *skb->data;
- if ((dlen <= 16) && (dlen <= skb->len)) {
- scp->conndata_in.opt_optl = cpu_to_le16(dlen);
- skb_copy_from_linear_data_offset(skb, 1,
- scp->conndata_in.opt_data, dlen);
- }
- }
- dn_nsp_send_link(sk, DN_NOCHANGE, 0);
- if (!sock_flag(sk, SOCK_DEAD))
- sk->sk_state_change(sk);
- }
-
-out:
- kfree_skb(skb);
-}
-
-static void dn_nsp_conn_ack(struct sock *sk, struct sk_buff *skb)
-{
- struct dn_scp *scp = DN_SK(sk);
-
- if (scp->state == DN_CI) {
- scp->state = DN_CD;
- scp->persist = 0;
- }
-
- kfree_skb(skb);
-}
-
-static void dn_nsp_disc_init(struct sock *sk, struct sk_buff *skb)
-{
- struct dn_scp *scp = DN_SK(sk);
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
- unsigned short reason;
-
- if (skb->len < 2)
- goto out;
-
- reason = le16_to_cpu(*(__le16 *)skb->data);
- skb_pull(skb, 2);
-
- scp->discdata_in.opt_status = cpu_to_le16(reason);
- scp->discdata_in.opt_optl = 0;
- memset(scp->discdata_in.opt_data, 0, 16);
-
- if (skb->len > 0) {
- u16 dlen = *skb->data;
- if ((dlen <= 16) && (dlen <= skb->len)) {
- scp->discdata_in.opt_optl = cpu_to_le16(dlen);
- skb_copy_from_linear_data_offset(skb, 1, scp->discdata_in.opt_data, dlen);
- }
- }
-
- scp->addrrem = cb->src_port;
- sk->sk_state = TCP_CLOSE;
-
- switch (scp->state) {
- case DN_CI:
- case DN_CD:
- scp->state = DN_RJ;
- sk->sk_err = ECONNREFUSED;
- break;
- case DN_RUN:
- sk->sk_shutdown |= SHUTDOWN_MASK;
- scp->state = DN_DN;
- break;
- case DN_DI:
- scp->state = DN_DIC;
- break;
- }
-
- if (!sock_flag(sk, SOCK_DEAD)) {
- if (sk->sk_socket->state != SS_UNCONNECTED)
- sk->sk_socket->state = SS_DISCONNECTING;
- sk->sk_state_change(sk);
- }
-
- /*
- * It appears that its possible for remote machines to send disc
- * init messages with no port identifier if we are in the CI and
- * possibly also the CD state. Obviously we shouldn't reply with
- * a message if we don't know what the end point is.
- */
- if (scp->addrrem) {
- dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
- }
- scp->persist_fxn = dn_destroy_timer;
- scp->persist = dn_nsp_persist(sk);
-
-out:
- kfree_skb(skb);
-}
-
-/*
- * disc_conf messages are also called no_resources or no_link
- * messages depending upon the "reason" field.
- */
-static void dn_nsp_disc_conf(struct sock *sk, struct sk_buff *skb)
-{
- struct dn_scp *scp = DN_SK(sk);
- unsigned short reason;
-
- if (skb->len != 2)
- goto out;
-
- reason = le16_to_cpu(*(__le16 *)skb->data);
-
- sk->sk_state = TCP_CLOSE;
-
- switch (scp->state) {
- case DN_CI:
- scp->state = DN_NR;
- break;
- case DN_DR:
- if (reason == NSP_REASON_DC)
- scp->state = DN_DRC;
- if (reason == NSP_REASON_NL)
- scp->state = DN_CN;
- break;
- case DN_DI:
- scp->state = DN_DIC;
- break;
- case DN_RUN:
- sk->sk_shutdown |= SHUTDOWN_MASK;
- fallthrough;
- case DN_CC:
- scp->state = DN_CN;
- }
-
- if (!sock_flag(sk, SOCK_DEAD)) {
- if (sk->sk_socket->state != SS_UNCONNECTED)
- sk->sk_socket->state = SS_DISCONNECTING;
- sk->sk_state_change(sk);
- }
-
- scp->persist_fxn = dn_destroy_timer;
- scp->persist = dn_nsp_persist(sk);
-
-out:
- kfree_skb(skb);
-}
-
-static void dn_nsp_linkservice(struct sock *sk, struct sk_buff *skb)
-{
- struct dn_scp *scp = DN_SK(sk);
- unsigned short segnum;
- unsigned char lsflags;
- signed char fcval;
- int wake_up = 0;
- char *ptr = skb->data;
- unsigned char fctype = scp->services_rem & NSP_FC_MASK;
-
- if (skb->len != 4)
- goto out;
-
- segnum = le16_to_cpu(*(__le16 *)ptr);
- ptr += 2;
- lsflags = *(unsigned char *)ptr++;
- fcval = *ptr;
-
- /*
- * Here we ignore erroneous packets which should really
- * should cause a connection abort. It is not critical
- * for now though.
- */
- if (lsflags & 0xf8)
- goto out;
-
- if (seq_next(scp->numoth_rcv, segnum)) {
- seq_add(&scp->numoth_rcv, 1);
- switch(lsflags & 0x04) { /* FCVAL INT */
- case 0x00: /* Normal Request */
- switch(lsflags & 0x03) { /* FCVAL MOD */
- case 0x00: /* Request count */
- if (fcval < 0) {
- unsigned char p_fcval = -fcval;
- if ((scp->flowrem_dat > p_fcval) &&
- (fctype == NSP_FC_SCMC)) {
- scp->flowrem_dat -= p_fcval;
- }
- } else if (fcval > 0) {
- scp->flowrem_dat += fcval;
- wake_up = 1;
- }
- break;
- case 0x01: /* Stop outgoing data */
- scp->flowrem_sw = DN_DONTSEND;
- break;
- case 0x02: /* Ok to start again */
- scp->flowrem_sw = DN_SEND;
- dn_nsp_output(sk);
- wake_up = 1;
- }
- break;
- case 0x04: /* Interrupt Request */
- if (fcval > 0) {
- scp->flowrem_oth += fcval;
- wake_up = 1;
- }
- break;
- }
- if (wake_up && !sock_flag(sk, SOCK_DEAD))
- sk->sk_state_change(sk);
- }
-
- dn_nsp_send_oth_ack(sk);
-
-out:
- kfree_skb(skb);
-}
-
-/*
- * Copy of sock_queue_rcv_skb (from sock.h) without
- * bh_lock_sock() (its already held when this is called) which
- * also allows data and other data to be queued to a socket.
- */
-static __inline__ int dn_queue_skb(struct sock *sk, struct sk_buff *skb, int sig, struct sk_buff_head *queue)
-{
- int err;
-
- /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
- number of warnings when compiling with -W --ANK
- */
- if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
- (unsigned int)sk->sk_rcvbuf) {
- err = -ENOMEM;
- goto out;
- }
-
- err = sk_filter(sk, skb);
- if (err)
- goto out;
-
- skb_set_owner_r(skb, sk);
- skb_queue_tail(queue, skb);
-
- if (!sock_flag(sk, SOCK_DEAD))
- sk->sk_data_ready(sk);
-out:
- return err;
-}
-
-static void dn_nsp_otherdata(struct sock *sk, struct sk_buff *skb)
-{
- struct dn_scp *scp = DN_SK(sk);
- unsigned short segnum;
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
- int queued = 0;
-
- if (skb->len < 2)
- goto out;
-
- cb->segnum = segnum = le16_to_cpu(*(__le16 *)skb->data);
- skb_pull(skb, 2);
-
- if (seq_next(scp->numoth_rcv, segnum)) {
-
- if (dn_queue_skb(sk, skb, SIGURG, &scp->other_receive_queue) == 0) {
- seq_add(&scp->numoth_rcv, 1);
- scp->other_report = 0;
- queued = 1;
- }
- }
-
- dn_nsp_send_oth_ack(sk);
-out:
- if (!queued)
- kfree_skb(skb);
-}
-
-static void dn_nsp_data(struct sock *sk, struct sk_buff *skb)
-{
- int queued = 0;
- unsigned short segnum;
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
- struct dn_scp *scp = DN_SK(sk);
-
- if (skb->len < 2)
- goto out;
-
- cb->segnum = segnum = le16_to_cpu(*(__le16 *)skb->data);
- skb_pull(skb, 2);
-
- if (seq_next(scp->numdat_rcv, segnum)) {
- if (dn_queue_skb(sk, skb, SIGIO, &sk->sk_receive_queue) == 0) {
- seq_add(&scp->numdat_rcv, 1);
- queued = 1;
- }
-
- if ((scp->flowloc_sw == DN_SEND) && dn_congested(sk)) {
- scp->flowloc_sw = DN_DONTSEND;
- dn_nsp_send_link(sk, DN_DONTSEND, 0);
- }
- }
-
- dn_nsp_send_data_ack(sk);
-out:
- if (!queued)
- kfree_skb(skb);
-}
-
-/*
- * If one of our conninit messages is returned, this function
- * deals with it. It puts the socket into the NO_COMMUNICATION
- * state.
- */
-static void dn_returned_conn_init(struct sock *sk, struct sk_buff *skb)
-{
- struct dn_scp *scp = DN_SK(sk);
-
- if (scp->state == DN_CI) {
- scp->state = DN_NC;
- sk->sk_state = TCP_CLOSE;
- if (!sock_flag(sk, SOCK_DEAD))
- sk->sk_state_change(sk);
- }
-
- kfree_skb(skb);
-}
-
-static int dn_nsp_no_socket(struct sk_buff *skb, unsigned short reason)
-{
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
- int ret = NET_RX_DROP;
-
- /* Must not reply to returned packets */
- if (cb->rt_flags & DN_RT_F_RTS)
- goto out;
-
- if ((reason != NSP_REASON_OK) && ((cb->nsp_flags & 0x0c) == 0x08)) {
- switch (cb->nsp_flags & 0x70) {
- case 0x10:
- case 0x60: /* (Retransmitted) Connect Init */
- dn_nsp_return_disc(skb, NSP_DISCINIT, reason);
- ret = NET_RX_SUCCESS;
- break;
- case 0x20: /* Connect Confirm */
- dn_nsp_return_disc(skb, NSP_DISCCONF, reason);
- ret = NET_RX_SUCCESS;
- break;
- }
- }
-
-out:
- kfree_skb(skb);
- return ret;
-}
-
-static int dn_nsp_rx_packet(struct net *net, struct sock *sk2,
- struct sk_buff *skb)
-{
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
- struct sock *sk = NULL;
- unsigned char *ptr = (unsigned char *)skb->data;
- unsigned short reason = NSP_REASON_NL;
-
- if (!pskb_may_pull(skb, 2))
- goto free_out;
-
- skb_reset_transport_header(skb);
- cb->nsp_flags = *ptr++;
-
- if (decnet_debug_level & 2)
- printk(KERN_DEBUG "dn_nsp_rx: Message type 0x%02x\n", (int)cb->nsp_flags);
-
- if (cb->nsp_flags & 0x83)
- goto free_out;
-
- /*
- * Filter out conninits and useless packet types
- */
- if ((cb->nsp_flags & 0x0c) == 0x08) {
- switch (cb->nsp_flags & 0x70) {
- case 0x00: /* NOP */
- case 0x70: /* Reserved */
- case 0x50: /* Reserved, Phase II node init */
- goto free_out;
- case 0x10:
- case 0x60:
- if (unlikely(cb->rt_flags & DN_RT_F_RTS))
- goto free_out;
- sk = dn_find_listener(skb, &reason);
- goto got_it;
- }
- }
-
- if (!pskb_may_pull(skb, 3))
- goto free_out;
-
- /*
- * Grab the destination address.
- */
- cb->dst_port = *(__le16 *)ptr;
- cb->src_port = 0;
- ptr += 2;
-
- /*
- * If not a connack, grab the source address too.
- */
- if (pskb_may_pull(skb, 5)) {
- cb->src_port = *(__le16 *)ptr;
- ptr += 2;
- skb_pull(skb, 5);
- }
-
- /*
- * Returned packets...
- * Swap src & dst and look up in the normal way.
- */
- if (unlikely(cb->rt_flags & DN_RT_F_RTS)) {
- swap(cb->dst_port, cb->src_port);
- swap(cb->dst, cb->src);
- }
-
- /*
- * Find the socket to which this skb is destined.
- */
- sk = dn_find_by_skb(skb);
-got_it:
- if (sk != NULL) {
- struct dn_scp *scp = DN_SK(sk);
-
- /* Reset backoff */
- scp->nsp_rxtshift = 0;
-
- /*
- * We linearize everything except data segments here.
- */
- if (cb->nsp_flags & ~0x60) {
- if (unlikely(skb_linearize(skb)))
- goto free_out;
- }
-
- return sk_receive_skb(sk, skb, 0);
- }
-
- return dn_nsp_no_socket(skb, reason);
-
-free_out:
- kfree_skb(skb);
- return NET_RX_DROP;
-}
-
-int dn_nsp_rx(struct sk_buff *skb)
-{
- return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_IN,
- &init_net, NULL, skb, skb->dev, NULL,
- dn_nsp_rx_packet);
-}
-
-/*
- * This is the main receive routine for sockets. It is called
- * from the above when the socket is not busy, and also from
- * sock_release() when there is a backlog queued up.
- */
-int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
-{
- struct dn_scp *scp = DN_SK(sk);
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
-
- if (cb->rt_flags & DN_RT_F_RTS) {
- if (cb->nsp_flags == 0x18 || cb->nsp_flags == 0x68)
- dn_returned_conn_init(sk, skb);
- else
- kfree_skb(skb);
- return NET_RX_SUCCESS;
- }
-
- /*
- * Control packet.
- */
- if ((cb->nsp_flags & 0x0c) == 0x08) {
- switch (cb->nsp_flags & 0x70) {
- case 0x10:
- case 0x60:
- dn_nsp_conn_init(sk, skb);
- break;
- case 0x20:
- dn_nsp_conn_conf(sk, skb);
- break;
- case 0x30:
- dn_nsp_disc_init(sk, skb);
- break;
- case 0x40:
- dn_nsp_disc_conf(sk, skb);
- break;
- }
-
- } else if (cb->nsp_flags == 0x24) {
- /*
- * Special for connacks, 'cos they don't have
- * ack data or ack otherdata info.
- */
- dn_nsp_conn_ack(sk, skb);
- } else {
- int other = 1;
-
- /* both data and ack frames can kick a CC socket into RUN */
- if ((scp->state == DN_CC) && !sock_flag(sk, SOCK_DEAD)) {
- scp->state = DN_RUN;
- sk->sk_state = TCP_ESTABLISHED;
- sk->sk_state_change(sk);
- }
-
- if ((cb->nsp_flags & 0x1c) == 0)
- other = 0;
- if (cb->nsp_flags == 0x04)
- other = 0;
-
- /*
- * Read out ack data here, this applies equally
- * to data, other data, link service and both
- * ack data and ack otherdata.
- */
- dn_process_ack(sk, skb, other);
-
- /*
- * If we've some sort of data here then call a
- * suitable routine for dealing with it, otherwise
- * the packet is an ack and can be discarded.
- */
- if ((cb->nsp_flags & 0x0c) == 0) {
-
- if (scp->state != DN_RUN)
- goto free_out;
-
- switch (cb->nsp_flags) {
- case 0x10: /* LS */
- dn_nsp_linkservice(sk, skb);
- break;
- case 0x30: /* OD */
- dn_nsp_otherdata(sk, skb);
- break;
- default:
- dn_nsp_data(sk, skb);
- }
-
- } else { /* Ack, chuck it out here */
-free_out:
- kfree_skb(skb);
- }
- }
-
- return NET_RX_SUCCESS;
-}
projects / linux-2.6-microblaze.git / blobdiff