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695 lines
17 KiB
695 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* DECnet An implementation of the DECnet protocol suite for the LINUX |
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* operating system. DECnet is implemented using the BSD Socket |
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* interface as the means of communication with the user level. |
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* |
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* DECnet Network Services Protocol (Output) |
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* |
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* Author: Eduardo Marcelo Serrat <[email protected]> |
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* |
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* Changes: |
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* |
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* Steve Whitehouse: Split into dn_nsp_in.c and dn_nsp_out.c from |
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* original dn_nsp.c. |
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* Steve Whitehouse: Updated to work with my new routing architecture. |
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* Steve Whitehouse: Added changes from Eduardo Serrat's patches. |
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* Steve Whitehouse: Now conninits have the "return" bit set. |
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* Steve Whitehouse: Fixes to check alloc'd skbs are non NULL! |
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* Moved output state machine into one function |
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* Steve Whitehouse: New output state machine |
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* Paul Koning: Connect Confirm message fix. |
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* Eduardo Serrat: Fix to stop dn_nsp_do_disc() sending malformed packets. |
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* Steve Whitehouse: dn_nsp_output() and friends needed a spring clean |
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* Steve Whitehouse: Moved dn_nsp_send() in here from route.h |
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*/ |
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/****************************************************************************** |
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(c) 1995-1998 E.M. Serrat [email protected] |
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*******************************************************************************/ |
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#include <linux/errno.h> |
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#include <linux/types.h> |
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#include <linux/socket.h> |
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#include <linux/in.h> |
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#include <linux/kernel.h> |
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#include <linux/timer.h> |
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#include <linux/string.h> |
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#include <linux/sockios.h> |
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#include <linux/net.h> |
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#include <linux/netdevice.h> |
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#include <linux/inet.h> |
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#include <linux/route.h> |
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#include <linux/slab.h> |
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#include <net/sock.h> |
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#include <linux/fcntl.h> |
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#include <linux/mm.h> |
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#include <linux/termios.h> |
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#include <linux/interrupt.h> |
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#include <linux/proc_fs.h> |
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#include <linux/stat.h> |
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#include <linux/init.h> |
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#include <linux/poll.h> |
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#include <linux/if_packet.h> |
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#include <net/neighbour.h> |
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#include <net/dst.h> |
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#include <net/flow.h> |
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#include <net/dn.h> |
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#include <net/dn_nsp.h> |
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#include <net/dn_dev.h> |
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#include <net/dn_route.h> |
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static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 }; |
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static void dn_nsp_send(struct sk_buff *skb) |
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{ |
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struct sock *sk = skb->sk; |
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struct dn_scp *scp = DN_SK(sk); |
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struct dst_entry *dst; |
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struct flowidn fld; |
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skb_reset_transport_header(skb); |
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scp->stamp = jiffies; |
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dst = sk_dst_check(sk, 0); |
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if (dst) { |
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try_again: |
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skb_dst_set(skb, dst); |
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dst_output(&init_net, skb->sk, skb); |
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return; |
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} |
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memset(&fld, 0, sizeof(fld)); |
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fld.flowidn_oif = sk->sk_bound_dev_if; |
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fld.saddr = dn_saddr2dn(&scp->addr); |
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fld.daddr = dn_saddr2dn(&scp->peer); |
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dn_sk_ports_copy(&fld, scp); |
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fld.flowidn_proto = DNPROTO_NSP; |
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if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, 0) == 0) { |
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dst = sk_dst_get(sk); |
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sk->sk_route_caps = dst->dev->features; |
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goto try_again; |
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} |
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sk->sk_err = EHOSTUNREACH; |
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if (!sock_flag(sk, SOCK_DEAD)) |
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sk->sk_state_change(sk); |
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} |
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/* |
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* If sk == NULL, then we assume that we are supposed to be making |
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* a routing layer skb. If sk != NULL, then we are supposed to be |
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* creating an skb for the NSP layer. |
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* |
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* The eventual aim is for each socket to have a cached header size |
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* for its outgoing packets, and to set hdr from this when sk != NULL. |
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*/ |
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struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri) |
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{ |
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struct sk_buff *skb; |
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int hdr = 64; |
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if ((skb = alloc_skb(size + hdr, pri)) == NULL) |
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return NULL; |
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skb->protocol = htons(ETH_P_DNA_RT); |
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skb->pkt_type = PACKET_OUTGOING; |
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if (sk) |
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skb_set_owner_w(skb, sk); |
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skb_reserve(skb, hdr); |
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return skb; |
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} |
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/* |
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* Calculate persist timer based upon the smoothed round |
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* trip time and the variance. Backoff according to the |
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* nsp_backoff[] array. |
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*/ |
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unsigned long dn_nsp_persist(struct sock *sk) |
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{ |
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struct dn_scp *scp = DN_SK(sk); |
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unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1; |
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t *= nsp_backoff[scp->nsp_rxtshift]; |
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if (t < HZ) t = HZ; |
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if (t > (600*HZ)) t = (600*HZ); |
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if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT) |
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scp->nsp_rxtshift++; |
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/* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */ |
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return t; |
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} |
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/* |
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* This is called each time we get an estimate for the rtt |
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* on the link. |
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*/ |
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static void dn_nsp_rtt(struct sock *sk, long rtt) |
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{ |
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struct dn_scp *scp = DN_SK(sk); |
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long srtt = (long)scp->nsp_srtt; |
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long rttvar = (long)scp->nsp_rttvar; |
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long delta; |
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/* |
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* If the jiffies clock flips over in the middle of timestamp |
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* gathering this value might turn out negative, so we make sure |
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* that is it always positive here. |
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*/ |
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if (rtt < 0) |
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rtt = -rtt; |
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/* |
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* Add new rtt to smoothed average |
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*/ |
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delta = ((rtt << 3) - srtt); |
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srtt += (delta >> 3); |
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if (srtt >= 1) |
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scp->nsp_srtt = (unsigned long)srtt; |
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else |
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scp->nsp_srtt = 1; |
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/* |
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* Add new rtt variance to smoothed varience |
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*/ |
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delta >>= 1; |
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rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2); |
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if (rttvar >= 1) |
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scp->nsp_rttvar = (unsigned long)rttvar; |
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else |
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scp->nsp_rttvar = 1; |
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/* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */ |
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} |
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/** |
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* dn_nsp_clone_and_send - Send a data packet by cloning it |
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* @skb: The packet to clone and transmit |
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* @gfp: memory allocation flag |
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* |
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* Clone a queued data or other data packet and transmit it. |
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* |
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* Returns: The number of times the packet has been sent previously |
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*/ |
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static inline unsigned int dn_nsp_clone_and_send(struct sk_buff *skb, |
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gfp_t gfp) |
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{ |
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struct dn_skb_cb *cb = DN_SKB_CB(skb); |
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struct sk_buff *skb2; |
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int ret = 0; |
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if ((skb2 = skb_clone(skb, gfp)) != NULL) { |
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ret = cb->xmit_count; |
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cb->xmit_count++; |
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cb->stamp = jiffies; |
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skb2->sk = skb->sk; |
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dn_nsp_send(skb2); |
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} |
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return ret; |
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} |
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/** |
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* dn_nsp_output - Try and send something from socket queues |
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* @sk: The socket whose queues are to be investigated |
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* |
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* Try and send the packet on the end of the data and other data queues. |
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* Other data gets priority over data, and if we retransmit a packet we |
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* reduce the window by dividing it in two. |
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* |
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*/ |
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void dn_nsp_output(struct sock *sk) |
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{ |
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struct dn_scp *scp = DN_SK(sk); |
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struct sk_buff *skb; |
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unsigned int reduce_win = 0; |
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/* |
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* First we check for otherdata/linkservice messages |
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*/ |
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if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL) |
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reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC); |
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/* |
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* If we may not send any data, we don't. |
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* If we are still trying to get some other data down the |
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* channel, we don't try and send any data. |
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*/ |
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if (reduce_win || (scp->flowrem_sw != DN_SEND)) |
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goto recalc_window; |
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if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL) |
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reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC); |
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/* |
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* If we've sent any frame more than once, we cut the |
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* send window size in half. There is always a minimum |
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* window size of one available. |
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*/ |
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recalc_window: |
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if (reduce_win) { |
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scp->snd_window >>= 1; |
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if (scp->snd_window < NSP_MIN_WINDOW) |
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scp->snd_window = NSP_MIN_WINDOW; |
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} |
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} |
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int dn_nsp_xmit_timeout(struct sock *sk) |
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{ |
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struct dn_scp *scp = DN_SK(sk); |
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dn_nsp_output(sk); |
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if (!skb_queue_empty(&scp->data_xmit_queue) || |
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!skb_queue_empty(&scp->other_xmit_queue)) |
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scp->persist = dn_nsp_persist(sk); |
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return 0; |
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} |
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static inline __le16 *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len) |
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{ |
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unsigned char *ptr = skb_push(skb, len); |
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BUG_ON(len < 5); |
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*ptr++ = msgflag; |
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*((__le16 *)ptr) = scp->addrrem; |
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ptr += 2; |
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*((__le16 *)ptr) = scp->addrloc; |
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ptr += 2; |
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return (__le16 __force *)ptr; |
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} |
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static __le16 *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other) |
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{ |
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struct dn_scp *scp = DN_SK(sk); |
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unsigned short acknum = scp->numdat_rcv & 0x0FFF; |
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unsigned short ackcrs = scp->numoth_rcv & 0x0FFF; |
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__le16 *ptr; |
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BUG_ON(hlen < 9); |
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scp->ackxmt_dat = acknum; |
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scp->ackxmt_oth = ackcrs; |
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acknum |= 0x8000; |
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ackcrs |= 0x8000; |
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/* If this is an "other data/ack" message, swap acknum and ackcrs */ |
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if (other) |
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swap(acknum, ackcrs); |
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/* Set "cross subchannel" bit in ackcrs */ |
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ackcrs |= 0x2000; |
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ptr = dn_mk_common_header(scp, skb, msgflag, hlen); |
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*ptr++ = cpu_to_le16(acknum); |
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*ptr++ = cpu_to_le16(ackcrs); |
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return ptr; |
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} |
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static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth) |
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{ |
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struct dn_scp *scp = DN_SK(sk); |
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struct dn_skb_cb *cb = DN_SKB_CB(skb); |
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__le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth); |
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if (unlikely(oth)) { |
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cb->segnum = scp->numoth; |
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seq_add(&scp->numoth, 1); |
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} else { |
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cb->segnum = scp->numdat; |
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seq_add(&scp->numdat, 1); |
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} |
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*(ptr++) = cpu_to_le16(cb->segnum); |
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return ptr; |
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} |
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void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, |
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gfp_t gfp, int oth) |
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{ |
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struct dn_scp *scp = DN_SK(sk); |
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struct dn_skb_cb *cb = DN_SKB_CB(skb); |
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unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1; |
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cb->xmit_count = 0; |
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dn_nsp_mk_data_header(sk, skb, oth); |
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/* |
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* Slow start: If we have been idle for more than |
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* one RTT, then reset window to min size. |
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*/ |
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if ((jiffies - scp->stamp) > t) |
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scp->snd_window = NSP_MIN_WINDOW; |
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if (oth) |
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skb_queue_tail(&scp->other_xmit_queue, skb); |
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else |
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skb_queue_tail(&scp->data_xmit_queue, skb); |
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if (scp->flowrem_sw != DN_SEND) |
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return; |
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dn_nsp_clone_and_send(skb, gfp); |
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} |
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int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum) |
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{ |
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struct dn_skb_cb *cb = DN_SKB_CB(skb); |
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struct dn_scp *scp = DN_SK(sk); |
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struct sk_buff *skb2, *n, *ack = NULL; |
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int wakeup = 0; |
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int try_retrans = 0; |
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unsigned long reftime = cb->stamp; |
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unsigned long pkttime; |
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unsigned short xmit_count; |
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unsigned short segnum; |
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skb_queue_walk_safe(q, skb2, n) { |
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struct dn_skb_cb *cb2 = DN_SKB_CB(skb2); |
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if (dn_before_or_equal(cb2->segnum, acknum)) |
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ack = skb2; |
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/* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */ |
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if (ack == NULL) |
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continue; |
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/* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */ |
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/* Does _last_ packet acked have xmit_count > 1 */ |
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try_retrans = 0; |
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/* Remember to wake up the sending process */ |
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wakeup = 1; |
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/* Keep various statistics */ |
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pkttime = cb2->stamp; |
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xmit_count = cb2->xmit_count; |
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segnum = cb2->segnum; |
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/* Remove and drop ack'ed packet */ |
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skb_unlink(ack, q); |
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kfree_skb(ack); |
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ack = NULL; |
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/* |
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* We don't expect to see acknowledgements for packets we |
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* haven't sent yet. |
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*/ |
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WARN_ON(xmit_count == 0); |
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/* |
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* If the packet has only been sent once, we can use it |
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* to calculate the RTT and also open the window a little |
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* further. |
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*/ |
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if (xmit_count == 1) { |
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if (dn_equal(segnum, acknum)) |
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dn_nsp_rtt(sk, (long)(pkttime - reftime)); |
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if (scp->snd_window < scp->max_window) |
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scp->snd_window++; |
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} |
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/* |
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* Packet has been sent more than once. If this is the last |
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* packet to be acknowledged then we want to send the next |
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* packet in the send queue again (assumes the remote host does |
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* go-back-N error control). |
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*/ |
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if (xmit_count > 1) |
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try_retrans = 1; |
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} |
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if (try_retrans) |
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dn_nsp_output(sk); |
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return wakeup; |
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} |
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void dn_nsp_send_data_ack(struct sock *sk) |
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{ |
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struct sk_buff *skb = NULL; |
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if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL) |
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return; |
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skb_reserve(skb, 9); |
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dn_mk_ack_header(sk, skb, 0x04, 9, 0); |
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dn_nsp_send(skb); |
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} |
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void dn_nsp_send_oth_ack(struct sock *sk) |
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{ |
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struct sk_buff *skb = NULL; |
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if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL) |
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return; |
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skb_reserve(skb, 9); |
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dn_mk_ack_header(sk, skb, 0x14, 9, 1); |
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dn_nsp_send(skb); |
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} |
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void dn_send_conn_ack (struct sock *sk) |
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{ |
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struct dn_scp *scp = DN_SK(sk); |
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struct sk_buff *skb = NULL; |
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struct nsp_conn_ack_msg *msg; |
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if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL) |
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return; |
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msg = skb_put(skb, 3); |
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msg->msgflg = 0x24; |
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msg->dstaddr = scp->addrrem; |
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dn_nsp_send(skb); |
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} |
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static int dn_nsp_retrans_conn_conf(struct sock *sk) |
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{ |
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struct dn_scp *scp = DN_SK(sk); |
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if (scp->state == DN_CC) |
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dn_send_conn_conf(sk, GFP_ATOMIC); |
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return 0; |
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} |
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void dn_send_conn_conf(struct sock *sk, gfp_t gfp) |
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{ |
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struct dn_scp *scp = DN_SK(sk); |
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struct sk_buff *skb = NULL; |
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struct nsp_conn_init_msg *msg; |
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__u8 len = (__u8)le16_to_cpu(scp->conndata_out.opt_optl); |
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if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL) |
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return; |
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msg = skb_put(skb, sizeof(*msg)); |
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msg->msgflg = 0x28; |
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msg->dstaddr = scp->addrrem; |
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msg->srcaddr = scp->addrloc; |
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msg->services = scp->services_loc; |
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msg->info = scp->info_loc; |
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msg->segsize = cpu_to_le16(scp->segsize_loc); |
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skb_put_u8(skb, len); |
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if (len > 0) |
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skb_put_data(skb, scp->conndata_out.opt_data, len); |
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dn_nsp_send(skb); |
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scp->persist = dn_nsp_persist(sk); |
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scp->persist_fxn = dn_nsp_retrans_conn_conf; |
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} |
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static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg, |
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unsigned short reason, gfp_t gfp, |
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struct dst_entry *dst, |
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int ddl, unsigned char *dd, __le16 rem, __le16 loc) |
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{ |
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struct sk_buff *skb = NULL; |
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int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0); |
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unsigned char *msg; |
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if ((dst == NULL) || (rem == 0)) { |
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net_dbg_ratelimited("DECnet: dn_nsp_do_disc: BUG! Please report this to [email protected] rem=%u dst=%p\n", |
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le16_to_cpu(rem), dst); |
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return; |
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} |
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if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL) |
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return; |
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msg = skb_put(skb, size); |
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*msg++ = msgflg; |
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*(__le16 *)msg = rem; |
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msg += 2; |
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*(__le16 *)msg = loc; |
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msg += 2; |
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*(__le16 *)msg = cpu_to_le16(reason); |
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msg += 2; |
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if (msgflg == NSP_DISCINIT) |
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*msg++ = ddl; |
|
|
|
if (ddl) { |
|
memcpy(msg, dd, ddl); |
|
} |
|
|
|
/* |
|
* This doesn't go via the dn_nsp_send() function since we need |
|
* to be able to send disc packets out which have no socket |
|
* associations. |
|
*/ |
|
skb_dst_set(skb, dst_clone(dst)); |
|
dst_output(&init_net, skb->sk, skb); |
|
} |
|
|
|
|
|
void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg, |
|
unsigned short reason, gfp_t gfp) |
|
{ |
|
struct dn_scp *scp = DN_SK(sk); |
|
int ddl = 0; |
|
|
|
if (msgflg == NSP_DISCINIT) |
|
ddl = le16_to_cpu(scp->discdata_out.opt_optl); |
|
|
|
if (reason == 0) |
|
reason = le16_to_cpu(scp->discdata_out.opt_status); |
|
|
|
dn_nsp_do_disc(sk, msgflg, reason, gfp, __sk_dst_get(sk), ddl, |
|
scp->discdata_out.opt_data, scp->addrrem, scp->addrloc); |
|
} |
|
|
|
|
|
void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg, |
|
unsigned short reason) |
|
{ |
|
struct dn_skb_cb *cb = DN_SKB_CB(skb); |
|
int ddl = 0; |
|
gfp_t gfp = GFP_ATOMIC; |
|
|
|
dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb_dst(skb), ddl, |
|
NULL, cb->src_port, cb->dst_port); |
|
} |
|
|
|
|
|
void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval) |
|
{ |
|
struct dn_scp *scp = DN_SK(sk); |
|
struct sk_buff *skb; |
|
unsigned char *ptr; |
|
gfp_t gfp = GFP_ATOMIC; |
|
|
|
if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL) |
|
return; |
|
|
|
skb_reserve(skb, DN_MAX_NSP_DATA_HEADER); |
|
ptr = skb_put(skb, 2); |
|
DN_SKB_CB(skb)->nsp_flags = 0x10; |
|
*ptr++ = lsflags; |
|
*ptr = fcval; |
|
|
|
dn_nsp_queue_xmit(sk, skb, gfp, 1); |
|
|
|
scp->persist = dn_nsp_persist(sk); |
|
scp->persist_fxn = dn_nsp_xmit_timeout; |
|
} |
|
|
|
static int dn_nsp_retrans_conninit(struct sock *sk) |
|
{ |
|
struct dn_scp *scp = DN_SK(sk); |
|
|
|
if (scp->state == DN_CI) |
|
dn_nsp_send_conninit(sk, NSP_RCI); |
|
|
|
return 0; |
|
} |
|
|
|
void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg) |
|
{ |
|
struct dn_scp *scp = DN_SK(sk); |
|
struct nsp_conn_init_msg *msg; |
|
unsigned char aux; |
|
unsigned char menuver; |
|
struct dn_skb_cb *cb; |
|
unsigned char type = 1; |
|
gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC; |
|
struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation); |
|
|
|
if (!skb) |
|
return; |
|
|
|
cb = DN_SKB_CB(skb); |
|
msg = skb_put(skb, sizeof(*msg)); |
|
|
|
msg->msgflg = msgflg; |
|
msg->dstaddr = 0x0000; /* Remote Node will assign it*/ |
|
|
|
msg->srcaddr = scp->addrloc; |
|
msg->services = scp->services_loc; /* Requested flow control */ |
|
msg->info = scp->info_loc; /* Version Number */ |
|
msg->segsize = cpu_to_le16(scp->segsize_loc); /* Max segment size */ |
|
|
|
if (scp->peer.sdn_objnum) |
|
type = 0; |
|
|
|
skb_put(skb, dn_sockaddr2username(&scp->peer, |
|
skb_tail_pointer(skb), type)); |
|
skb_put(skb, dn_sockaddr2username(&scp->addr, |
|
skb_tail_pointer(skb), 2)); |
|
|
|
menuver = DN_MENUVER_ACC | DN_MENUVER_USR; |
|
if (scp->peer.sdn_flags & SDF_PROXY) |
|
menuver |= DN_MENUVER_PRX; |
|
if (scp->peer.sdn_flags & SDF_UICPROXY) |
|
menuver |= DN_MENUVER_UIC; |
|
|
|
skb_put_u8(skb, menuver); /* Menu Version */ |
|
|
|
aux = scp->accessdata.acc_userl; |
|
skb_put_u8(skb, aux); |
|
if (aux > 0) |
|
skb_put_data(skb, scp->accessdata.acc_user, aux); |
|
|
|
aux = scp->accessdata.acc_passl; |
|
skb_put_u8(skb, aux); |
|
if (aux > 0) |
|
skb_put_data(skb, scp->accessdata.acc_pass, aux); |
|
|
|
aux = scp->accessdata.acc_accl; |
|
skb_put_u8(skb, aux); |
|
if (aux > 0) |
|
skb_put_data(skb, scp->accessdata.acc_acc, aux); |
|
|
|
aux = (__u8)le16_to_cpu(scp->conndata_out.opt_optl); |
|
skb_put_u8(skb, aux); |
|
if (aux > 0) |
|
skb_put_data(skb, scp->conndata_out.opt_data, aux); |
|
|
|
scp->persist = dn_nsp_persist(sk); |
|
scp->persist_fxn = dn_nsp_retrans_conninit; |
|
|
|
cb->rt_flags = DN_RT_F_RQR; |
|
|
|
dn_nsp_send(skb); |
|
}
|
|
|