forked from Minki/linux
19c198d9c1
Remove trailing whitespace and extra lines at EOF Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
704 lines
17 KiB
C
704 lines
17 KiB
C
/*
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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 <emserrat@geocities.com>
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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 emserrat@geocities.com
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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 varience 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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void dn_send_conn_conf(struct sock *sk, gfp_t gfp)
|
|
{
|
|
struct dn_scp *scp = DN_SK(sk);
|
|
struct sk_buff *skb = NULL;
|
|
struct nsp_conn_init_msg *msg;
|
|
__u8 len = (__u8)le16_to_cpu(scp->conndata_out.opt_optl);
|
|
|
|
if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL)
|
|
return;
|
|
|
|
msg = skb_put(skb, sizeof(*msg));
|
|
msg->msgflg = 0x28;
|
|
msg->dstaddr = scp->addrrem;
|
|
msg->srcaddr = scp->addrloc;
|
|
msg->services = scp->services_loc;
|
|
msg->info = scp->info_loc;
|
|
msg->segsize = cpu_to_le16(scp->segsize_loc);
|
|
|
|
skb_put_u8(skb, len);
|
|
|
|
if (len > 0)
|
|
skb_put_data(skb, scp->conndata_out.opt_data, len);
|
|
|
|
|
|
dn_nsp_send(skb);
|
|
|
|
scp->persist = dn_nsp_persist(sk);
|
|
scp->persist_fxn = dn_nsp_retrans_conn_conf;
|
|
}
|
|
|
|
|
|
static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
|
|
unsigned short reason, gfp_t gfp,
|
|
struct dst_entry *dst,
|
|
int ddl, unsigned char *dd, __le16 rem, __le16 loc)
|
|
{
|
|
struct sk_buff *skb = NULL;
|
|
int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0);
|
|
unsigned char *msg;
|
|
|
|
if ((dst == NULL) || (rem == 0)) {
|
|
net_dbg_ratelimited("DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n",
|
|
le16_to_cpu(rem), dst);
|
|
return;
|
|
}
|
|
|
|
if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL)
|
|
return;
|
|
|
|
msg = skb_put(skb, size);
|
|
*msg++ = msgflg;
|
|
*(__le16 *)msg = rem;
|
|
msg += 2;
|
|
*(__le16 *)msg = loc;
|
|
msg += 2;
|
|
*(__le16 *)msg = cpu_to_le16(reason);
|
|
msg += 2;
|
|
if (msgflg == NSP_DISCINIT)
|
|
*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);
|
|
}
|