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- /*
- * INET An implementation of the TCP/IP protocol suite for the LINUX
- * operating system. INET is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * SOCK - AF_INET protocol family socket handler.
- *
- * Version: @(#)sock.c 1.0.17 06/02/93
- *
- * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
- * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
- * Florian La Roche, <flla@stud.uni-sb.de>
- *
- * Fixes:
- * Alan Cox : Numerous verify_area() problems
- * Alan Cox : Connecting on a connecting socket
- * now returns an error for tcp.
- * Alan Cox : sock->protocol is set correctly.
- * and is not sometimes left as 0.
- * Alan Cox : connect handles icmp errors on a
- * connect properly. Unfortunately there
- * is a restart syscall nasty there. I
- * can't match BSD without hacking the C
- * library. Ideas urgently sought!
- * Alan Cox : Disallow bind() to addresses that are
- * not ours - especially broadcast ones!!
- * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
- * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
- * instead they leave that for the DESTROY timer.
- * Alan Cox : Clean up error flag in accept
- * Alan Cox : TCP ack handling is buggy, the DESTROY timer
- * was buggy. Put a remove_sock() in the handler
- * for memory when we hit 0. Also altered the timer
- * code. The ACK stuff can wait and needs major
- * TCP layer surgery.
- * Alan Cox : Fixed TCP ack bug, removed remove sock
- * and fixed timer/inet_bh race.
- * Alan Cox : Added zapped flag for TCP
- * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
- * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
- * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
- * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
- * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenely occured to me how easy it was so...
- * Rick Sladkey : Relaxed UDP rules for matching packets.
- * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
- * Pauline Middelink : Pidentd support
- * Alan Cox : Fixed connect() taking signals I think.
- * Alan Cox : SO_LINGER supported
- * Alan Cox : Error reporting fixes
- * Anonymous : inet_create tidied up (sk->reuse setting)
- * Alan Cox : inet sockets don't set sk->type!
- * Alan Cox : Split socket option code
- * Alan Cox : Callbacks
- * Alan Cox : Nagle flag for Charles & Johannes stuff
- *
- * To Fix:
- *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
- #include <linux/config.h>
- #include <linux/errno.h>
- #include <linux/types.h>
- #include <linux/socket.h>
- #include <linux/in.h>
- #include <linux/kernel.h>
- #include <linux/major.h>
- #include <linux/sched.h>
- #include <linux/timer.h>
- #include <linux/string.h>
- #include <linux/sockios.h>
- #include <linux/net.h>
- #include <linux/fcntl.h>
- #include <linux/mm.h>
- #include <linux/interrupt.h>
-
- #include <asm/segment.h>
- #include <asm/system.h>
-
- #include "inet.h"
- #include "dev.h"
- #include "ip.h"
- #include "protocol.h"
- #include "arp.h"
- #include "route.h"
- #include "tcp.h"
- #include "udp.h"
- #include "skbuff.h"
- #include "sock.h"
- #include "raw.h"
- #include "icmp.h"
-
-
- int inet_debug = DBG_OFF; /* INET module debug flag */
-
-
- #define min(a,b) ((a)<(b)?(a):(b))
-
- extern struct proto packet_prot;
-
-
- void
- print_sk(struct sock *sk)
- {
- if (!sk) {
- printk(" print_sk(NULL)\n");
- return;
- }
- printk(" wmem_alloc = %lu\n", sk->wmem_alloc);
- printk(" rmem_alloc = %lu\n", sk->rmem_alloc);
- printk(" send_head = %p\n", sk->send_head);
- printk(" state = %d\n",sk->state);
- printk(" wback = %p, rqueue = %p\n", sk->wback, sk->rqueue);
- printk(" wfront = %p\n", sk->wfront);
- printk(" daddr = %lX, saddr = %lX\n", sk->daddr,sk->saddr);
- printk(" num = %d", sk->num);
- printk(" next = %p\n", sk->next);
- printk(" write_seq = %ld, acked_seq = %ld, copied_seq = %ld\n",
- sk->write_seq, sk->acked_seq, sk->copied_seq);
- printk(" rcv_ack_seq = %ld, window_seq = %ld, fin_seq = %ld\n",
- sk->rcv_ack_seq, sk->window_seq, sk->fin_seq);
- printk(" prot = %p\n", sk->prot);
- printk(" pair = %p, back_log = %p\n", sk->pair,sk->back_log);
- printk(" inuse = %d , blog = %d\n", sk->inuse, sk->blog);
- printk(" dead = %d delay_acks=%d\n", sk->dead, sk->delay_acks);
- printk(" retransmits = %ld, timeout = %d\n", sk->retransmits, sk->timeout);
- printk(" cong_window = %d, packets_out = %d\n", sk->cong_window,
- sk->packets_out);
- printk(" shutdown=%d\n", sk->shutdown);
- }
-
-
- void
- print_skb(struct sk_buff *skb)
- {
- if (!skb) {
- printk(" print_skb(NULL)\n");
- return;
- }
- printk(" prev = %p, next = %p\n", skb->prev, skb->next);
- printk(" sk = %p link3 = %p\n", skb->sk, skb->link3);
- printk(" mem_addr = %p, mem_len = %lu\n", skb->mem_addr, skb->mem_len);
- printk(" used = %d free = %d\n", skb->used,skb->free);
- }
-
-
-
- static int
- sk_inuse(struct proto *prot, int num)
- {
- struct sock *sk;
-
- for(sk = prot->sock_array[num & (SOCK_ARRAY_SIZE -1 )];
- sk != NULL;
- sk=sk->next) {
- if (sk->num == num) return(1);
- }
- return(0);
- }
-
-
- unsigned short
- get_new_socknum(struct proto *prot, unsigned short base)
- {
- static int start=0;
-
- /*
- * Used to cycle through the port numbers so the
- * chances of a confused connection drop.
- */
- int i, j;
- int best = 0;
- int size = 32767; /* a big num. */
- struct sock *sk;
-
- if (base == 0) base = PROT_SOCK+1+(start % 1024);
- if (base <= PROT_SOCK) {
- base += PROT_SOCK+(start % 1024);
- }
-
- /* Now look through the entire array and try to find an empty ptr. */
- for(i=0; i < SOCK_ARRAY_SIZE; i++) {
- j = 0;
- sk = prot->sock_array[(i+base+1) &(SOCK_ARRAY_SIZE -1)];
- while(sk != NULL) {
- sk = sk->next;
- j++;
- }
- if (j == 0) {
- start =(i+1+start )%1024;
- DPRINTF((DBG_INET, "get_new_socknum returning %d, start = %d\n",
- i + base + 1, start));
- return(i+base+1);
- }
- if (j < size) {
- best = i;
- size = j;
- }
- }
-
- /* Now make sure the one we want is not in use. */
- while(sk_inuse(prot, base +best+1)) {
- best += SOCK_ARRAY_SIZE;
- }
- DPRINTF((DBG_INET, "get_new_socknum returning %d, start = %d\n",
- best + base + 1, start));
- return(best+base+1);
- }
-
-
- void
- put_sock(unsigned short num, struct sock *sk)
- {
- struct sock *sk1;
- struct sock *sk2;
- int mask;
-
- DPRINTF((DBG_INET, "put_sock(num = %d, sk = %X\n", num, sk));
- sk->num = num;
- sk->next = NULL;
- num = num &(SOCK_ARRAY_SIZE -1);
-
- /* We can't have an interupt re-enter here. */
- cli();
- if (sk->prot->sock_array[num] == NULL) {
- sk->prot->sock_array[num] = sk;
- sti();
- return;
- }
- sti();
- for(mask = 0xff000000; mask != 0xffffffff; mask = (mask >> 8) | mask) {
- if ((mask & sk->saddr) &&
- (mask & sk->saddr) != (mask & 0xffffffff)) {
- mask = mask << 8;
- break;
- }
- }
- DPRINTF((DBG_INET, "mask = %X\n", mask));
-
- cli();
- sk1 = sk->prot->sock_array[num];
- for(sk2 = sk1; sk2 != NULL; sk2=sk2->next) {
- if (!(sk2->saddr & mask)) {
- if (sk2 == sk1) {
- sk->next = sk->prot->sock_array[num];
- sk->prot->sock_array[num] = sk;
- sti();
- return;
- }
- sk->next = sk2;
- sk1->next= sk;
- sti();
- return;
- }
- sk1 = sk2;
- }
-
- /* Goes at the end. */
- sk->next = NULL;
- sk1->next = sk;
- sti();
- }
-
-
- static void
- remove_sock(struct sock *sk1)
- {
- struct sock *sk2;
-
- DPRINTF((DBG_INET, "remove_sock(sk1=%X)\n", sk1));
- if (!sk1) {
- printk("sock.c: remove_sock: sk1 == NULL\n");
- return;
- }
-
- if (!sk1->prot) {
- printk("sock.c: remove_sock: sk1->prot == NULL\n");
- return;
- }
-
- /* We can't have this changing out from under us. */
- cli();
- sk2 = sk1->prot->sock_array[sk1->num &(SOCK_ARRAY_SIZE -1)];
- if (sk2 == sk1) {
- sk1->prot->sock_array[sk1->num &(SOCK_ARRAY_SIZE -1)] = sk1->next;
- sti();
- return;
- }
-
- while(sk2 && sk2->next != sk1) {
- sk2 = sk2->next;
- }
-
- if (sk2) {
- sk2->next = sk1->next;
- sti();
- return;
- }
- sti();
-
- if (sk1->num != 0) DPRINTF((DBG_INET, "remove_sock: sock not found.\n"));
- }
-
-
- void
- destroy_sock(struct sock *sk)
- {
- struct sk_buff *skb;
-
- DPRINTF((DBG_INET, "destroying socket %X\n", sk));
- sk->inuse = 1; /* just to be safe. */
-
- /* Incase it's sleeping somewhere. */
- if (!sk->dead)
- sk->write_space(sk);
-
- remove_sock(sk);
-
- /* Now we can no longer get new packets. */
- delete_timer(sk);
-
-
- while ((skb = tcp_dequeue_partial(sk)) != NULL)
- {
- IS_SKB(skb);
- kfree_skb(skb, FREE_WRITE);
- }
-
- /* Cleanup up the write buffer. */
- for(skb = sk->wfront; skb != NULL; )
- {
- struct sk_buff *skb2;
-
- skb2=(struct sk_buff *)skb->next;
- if (skb->magic != TCP_WRITE_QUEUE_MAGIC) {
- printk("sock.c:destroy_sock write queue with bad magic(%X)\n",
- skb->magic);
- break;
- }
- IS_SKB(skb);
- kfree_skb(skb, FREE_WRITE);
- skb = skb2;
- }
-
- sk->wfront = NULL;
- sk->wback = NULL;
-
- if (sk->rqueue != NULL)
- {
- while((skb=skb_dequeue(&sk->rqueue))!=NULL)
- {
- /*
- * This will take care of closing sockets that were
- * listening and didn't accept everything.
- */
- if (skb->sk != NULL && skb->sk != sk)
- {
- IS_SKB(skb);
- skb->sk->dead = 1;
- skb->sk->prot->close(skb->sk, 0);
- }
- IS_SKB(skb);
- kfree_skb(skb, FREE_READ);
- }
- }
- sk->rqueue = NULL;
-
- /* Now we need to clean up the send head. */
- for(skb = sk->send_head; skb != NULL; )
- {
- struct sk_buff *skb2;
-
- /*
- * We need to remove skb from the transmit queue,
- * or maybe the arp queue.
- */
- cli();
- /* see if it's in a transmit queue. */
- /* this can be simplified quite a bit. Look */
- /* at tcp.c:tcp_ack to see how. */
- if (skb->next != NULL)
- {
- IS_SKB(skb);
- skb_unlink(skb);
- }
- skb->dev = NULL;
- sti();
- skb2 = (struct sk_buff *)skb->link3;
- kfree_skb(skb, FREE_WRITE);
- skb = skb2;
- }
- sk->send_head = NULL;
-
- /* And now the backlog. */
- if (sk->back_log != NULL)
- {
- /* this should never happen. */
- printk("cleaning back_log. \n");
- cli();
- skb = (struct sk_buff *)sk->back_log;
- do
- {
- struct sk_buff *skb2;
-
- skb2 = (struct sk_buff *)skb->next;
- kfree_skb(skb, FREE_READ);
- skb = skb2;
- }
- while(skb != sk->back_log);
- sti();
- }
- sk->back_log = NULL;
-
- /* Now if it has a half accepted/ closed socket. */
- if (sk->pair)
- {
- sk->pair->dead = 1;
- sk->pair->prot->close(sk->pair, 0);
- sk->pair = NULL;
- }
-
- /*
- * Now if everything is gone we can free the socket
- * structure, otherwise we need to keep it around until
- * everything is gone.
- */
- if (sk->rmem_alloc == 0 && sk->wmem_alloc == 0)
- {
- kfree_s((void *)sk,sizeof(*sk));
- }
- else
- {
- /* this should never happen. */
- /* actually it can if an ack has just been sent. */
- DPRINTF((DBG_INET, "possible memory leak in socket = %X\n", sk));
- sk->destroy = 1;
- sk->ack_backlog = 0;
- sk->inuse = 0;
- reset_timer(sk, TIME_DESTROY, SOCK_DESTROY_TIME);
- }
- DPRINTF((DBG_INET, "leaving destroy_sock\n"));
- }
-
-
- static int
- inet_fcntl(struct socket *sock, unsigned int cmd, unsigned long arg)
- {
- struct sock *sk;
-
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
-
- switch(cmd) {
- case F_SETOWN:
- /*
- * This is a little restrictive, but it's the only
- * way to make sure that you can't send a sigurg to
- * another process.
- */
- if (!suser() && current->pgrp != -arg &&
- current->pid != arg) return(-EPERM);
- sk->proc = arg;
- return(0);
- case F_GETOWN:
- return(sk->proc);
- default:
- return(-EINVAL);
- }
- }
-
- /*
- * Set socket options on an inet socket.
- */
-
- static int inet_setsockopt(struct socket *sock, int level, int optname,
- char *optval, int optlen)
- {
- struct sock *sk = (struct sock *) sock->data;
- if (level == SOL_SOCKET)
- return sock_setsockopt(sk,level,optname,optval,optlen);
- if (sk->prot->setsockopt==NULL)
- return(-EOPNOTSUPP);
- else
- return sk->prot->setsockopt(sk,level,optname,optval,optlen);
- }
-
-
-
-
- static int inet_getsockopt(struct socket *sock, int level, int optname,
- char *optval, int *optlen)
- {
- struct sock *sk = (struct sock *) sock->data;
- if (level == SOL_SOCKET)
- return sock_getsockopt(sk,level,optname,optval,optlen);
- if(sk->prot->getsockopt==NULL)
- return(-EOPNOTSUPP);
- else
- return sk->prot->getsockopt(sk,level,optname,optval,optlen);
- }
-
- /*
- * This is meant for all protocols to use and covers goings on
- * at the socket level. Everything here is generic.
- */
-
- int sock_setsockopt(struct sock *sk, int level, int optname,
- char *optval, int optlen)
- {
- int val;
- int err;
- struct linger ling;
-
- if (optval == NULL)
- return(-EINVAL);
-
- err=verify_area(VERIFY_READ, optval, sizeof(int));
- if(err)
- return err;
-
- val = get_fs_long((unsigned long *)optval);
- switch(optname)
- {
- case SO_TYPE:
- case SO_ERROR:
- return(-ENOPROTOOPT);
-
- case SO_DEBUG:
- sk->debug=val?1:0;
- case SO_DONTROUTE: /* Still to be implemented */
- return(0);
- case SO_BROADCAST:
- sk->broadcast=val?1:0;
- return 0;
- case SO_SNDBUF:
- if(val>32767)
- val=32767;
- if(val<256)
- val=256;
- sk->sndbuf=val;
- return 0;
- case SO_LINGER:
- err=verify_area(VERIFY_READ,optval,sizeof(ling));
- if(err)
- return err;
- memcpy_fromfs(&ling,optval,sizeof(ling));
- if(ling.l_onoff==0)
- sk->linger=0;
- else
- {
- sk->lingertime=ling.l_linger;
- sk->linger=1;
- }
- return 0;
- case SO_RCVBUF:
- if(val>32767)
- val=32767;
- if(val<256)
- val=256;
- sk->rcvbuf=val;
- return(0);
-
- case SO_REUSEADDR:
- if (val)
- sk->reuse = 1;
- else
- sk->reuse = 0;
- return(0);
-
- case SO_KEEPALIVE:
- if (val)
- sk->keepopen = 1;
- else
- sk->keepopen = 0;
- return(0);
-
- case SO_OOBINLINE:
- if (val)
- sk->urginline = 1;
- else
- sk->urginline = 0;
- return(0);
-
- case SO_NO_CHECK:
- if (val)
- sk->no_check = 1;
- else
- sk->no_check = 0;
- return(0);
-
- case SO_PRIORITY:
- if (val >= 0 && val < DEV_NUMBUFFS)
- {
- sk->priority = val;
- }
- else
- {
- return(-EINVAL);
- }
- return(0);
-
- default:
- return(-ENOPROTOOPT);
- }
- }
-
-
- int sock_getsockopt(struct sock *sk, int level, int optname,
- char *optval, int *optlen)
- {
- int val;
- int err;
- struct linger ling;
-
- switch(optname)
- {
- case SO_DEBUG:
- val = sk->debug;
- break;
-
- case SO_DONTROUTE: /* One last option to implement */
- val = 0;
- break;
-
- case SO_BROADCAST:
- val= sk->broadcast;
- break;
-
- case SO_LINGER:
- err=verify_area(VERIFY_WRITE,optval,sizeof(ling));
- if(err)
- return err;
- err=verify_area(VERIFY_WRITE,optlen,sizeof(int));
- if(err)
- return err;
- put_fs_long(sizeof(ling),(unsigned long *)optlen);
- ling.l_onoff=sk->linger;
- ling.l_linger=sk->lingertime;
- memcpy_tofs(optval,&ling,sizeof(ling));
- return 0;
-
- case SO_SNDBUF:
- val=sk->sndbuf;
- break;
-
- case SO_RCVBUF:
- val =sk->rcvbuf;
- break;
-
- case SO_REUSEADDR:
- val = sk->reuse;
- break;
-
- case SO_KEEPALIVE:
- val = sk->keepopen;
- break;
-
- case SO_TYPE:
- if (sk->prot == &tcp_prot)
- val = SOCK_STREAM;
- else
- val = SOCK_DGRAM;
- break;
-
- case SO_ERROR:
- val = sk->err;
- sk->err = 0;
- break;
-
- case SO_OOBINLINE:
- val = sk->urginline;
- break;
-
- case SO_NO_CHECK:
- val = sk->no_check;
- break;
-
- case SO_PRIORITY:
- val = sk->priority;
- break;
-
- default:
- return(-ENOPROTOOPT);
- }
- err=verify_area(VERIFY_WRITE, optlen, sizeof(int));
- if(err)
- return err;
- put_fs_long(sizeof(int),(unsigned long *) optlen);
-
- err=verify_area(VERIFY_WRITE, optval, sizeof(int));
- if(err)
- return err;
- put_fs_long(val,(unsigned long *)optval);
-
- return(0);
- }
-
-
-
-
- static int
- inet_listen(struct socket *sock, int backlog)
- {
- struct sock *sk;
-
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
-
- /* We may need to bind the socket. */
- if (sk->num == 0) {
- sk->num = get_new_socknum(sk->prot, 0);
- if (sk->num == 0) return(-EAGAIN);
- put_sock(sk->num, sk);
- sk->dummy_th.source = ntohs(sk->num);
- }
-
- /* We might as well re use these. */
- sk->max_ack_backlog = backlog;
- if (sk->state != TCP_LISTEN) {
- sk->ack_backlog = 0;
- sk->state = TCP_LISTEN;
- }
- return(0);
- }
-
- /*
- * Default callbacks for user INET sockets. These just wake up
- * the user owning the socket.
- */
-
- static void def_callback1(struct sock *sk)
- {
- if(!sk->dead)
- wake_up_interruptible(sk->sleep);
- }
-
- static void def_callback2(struct sock *sk,int len)
- {
- if(!sk->dead)
- wake_up_interruptible(sk->sleep);
- }
-
-
- static int
- inet_create(struct socket *sock, int protocol)
- {
- struct sock *sk;
- struct proto *prot;
- int err;
-
- sk = (struct sock *) kmalloc(sizeof(*sk), GFP_KERNEL);
- if (sk == NULL)
- return(-ENOMEM);
- sk->num = 0;
- sk->reuse = 0;
- switch(sock->type) {
- case SOCK_STREAM:
- case SOCK_SEQPACKET:
- if (protocol && protocol != IPPROTO_TCP) {
- kfree_s((void *)sk, sizeof(*sk));
- return(-EPROTONOSUPPORT);
- }
- protocol = IPPROTO_TCP;
- sk->no_check = TCP_NO_CHECK;
- prot = &tcp_prot;
- break;
-
- case SOCK_DGRAM:
- if (protocol && protocol != IPPROTO_UDP) {
- kfree_s((void *)sk, sizeof(*sk));
- return(-EPROTONOSUPPORT);
- }
- protocol = IPPROTO_UDP;
- sk->no_check = UDP_NO_CHECK;
- prot=&udp_prot;
- break;
-
- case SOCK_RAW:
- if (!suser()) {
- kfree_s((void *)sk, sizeof(*sk));
- return(-EPERM);
- }
- if (!protocol) {
- kfree_s((void *)sk, sizeof(*sk));
- return(-EPROTONOSUPPORT);
- }
- prot = &raw_prot;
- sk->reuse = 1;
- sk->no_check = 0; /*
- * Doesn't matter no checksum is
- * preformed anyway.
- */
- sk->num = protocol;
- break;
-
- case SOCK_PACKET:
- if (!suser()) {
- kfree_s((void *)sk, sizeof(*sk));
- return(-EPERM);
- }
- if (!protocol) {
- kfree_s((void *)sk, sizeof(*sk));
- return(-EPROTONOSUPPORT);
- }
- prot = &packet_prot;
- sk->reuse = 1;
- sk->no_check = 0; /* Doesn't matter no checksum is
- * preformed anyway.
- */
- sk->num = protocol;
- break;
-
- default:
- kfree_s((void *)sk, sizeof(*sk));
- return(-ESOCKTNOSUPPORT);
- }
- sk->socket = sock;
- #ifdef CONFIG_TCP_NAGLE_OFF
- sk->nonagle = 1;
- #else
- sk->nonagle = 0;
- #endif
- sk->type = sock->type;
- sk->protocol = protocol;
- sk->wmem_alloc = 0;
- sk->rmem_alloc = 0;
- sk->sndbuf = SK_WMEM_MAX;
- sk->rcvbuf = SK_RMEM_MAX;
- sk->pair = NULL;
- sk->opt = NULL;
- sk->write_seq = 0;
- sk->acked_seq = 0;
- sk->copied_seq = 0;
- sk->fin_seq = 0;
- sk->urg_seq = 0;
- sk->urg_data = 0;
- sk->proc = 0;
- sk->rtt = TCP_WRITE_TIME << 3;
- sk->rto = TCP_WRITE_TIME;
- sk->mdev = 0;
- sk->backoff = 0;
- sk->packets_out = 0;
- sk->cong_window = 1; /* start with only sending one packet at a time. */
- sk->cong_count = 0;
- sk->ssthresh = 0;
- sk->max_window = 0;
- sk->urginline = 0;
- sk->intr = 0;
- sk->linger = 0;
- sk->destroy = 0;
-
- sk->priority = 1;
- sk->shutdown = 0;
- sk->keepopen = 0;
- sk->zapped = 0;
- sk->done = 0;
- sk->ack_backlog = 0;
- sk->window = 0;
- sk->bytes_rcv = 0;
- sk->state = TCP_CLOSE;
- sk->dead = 0;
- sk->ack_timed = 0;
- sk->partial = NULL;
- sk->user_mss = 0;
- sk->debug = 0;
-
- /* this is how many unacked bytes we will accept for this socket. */
- sk->max_unacked = 2048; /* needs to be at most 2 full packets. */
-
- /* how many packets we should send before forcing an ack.
- if this is set to zero it is the same as sk->delay_acks = 0 */
- sk->max_ack_backlog = 0;
- sk->inuse = 0;
- sk->delay_acks = 0;
- sk->wback = NULL;
- sk->wfront = NULL;
- sk->rqueue = NULL;
- sk->mtu = 576;
- sk->prot = prot;
- sk->sleep = sock->wait;
- sk->daddr = 0;
- sk->saddr = my_addr();
- sk->err = 0;
- sk->next = NULL;
- sk->pair = NULL;
- sk->send_tail = NULL;
- sk->send_head = NULL;
- sk->timeout = 0;
- sk->broadcast = 0;
- sk->timer.data = (unsigned long)sk;
- sk->timer.function = &net_timer;
- sk->back_log = NULL;
- sk->blog = 0;
- sock->data =(void *) sk;
- sk->dummy_th.doff = sizeof(sk->dummy_th)/4;
- sk->dummy_th.res1=0;
- sk->dummy_th.res2=0;
- sk->dummy_th.urg_ptr = 0;
- sk->dummy_th.fin = 0;
- sk->dummy_th.syn = 0;
- sk->dummy_th.rst = 0;
- sk->dummy_th.psh = 0;
- sk->dummy_th.ack = 0;
- sk->dummy_th.urg = 0;
- sk->dummy_th.dest = 0;
-
- sk->ip_tos=0;
- sk->ip_ttl=64;
-
- sk->state_change = def_callback1;
- sk->data_ready = def_callback2;
- sk->write_space = def_callback1;
- sk->error_report = def_callback1;
-
- if (sk->num) {
- /*
- * It assumes that any protocol which allows
- * the user to assign a number at socket
- * creation time automatically
- * shares.
- */
- put_sock(sk->num, sk);
- sk->dummy_th.source = ntohs(sk->num);
- }
-
- if (sk->prot->init) {
- err = sk->prot->init(sk);
- if (err != 0) {
- destroy_sock(sk);
- return(err);
- }
- }
- return(0);
- }
-
-
- static int
- inet_dup(struct socket *newsock, struct socket *oldsock)
- {
- return(inet_create(newsock,
- ((struct sock *)(oldsock->data))->protocol));
- }
-
-
- /* The peer socket should always be NULL. */
- static int
- inet_release(struct socket *sock, struct socket *peer)
- {
- struct sock *sk;
-
- sk = (struct sock *) sock->data;
- if (sk == NULL) return(0);
-
- DPRINTF((DBG_INET, "inet_release(sock = %X, peer = %X)\n", sock, peer));
- sk->state_change(sk);
-
- /* Start closing the connection. This may take a while. */
- /*
- * If linger is set, we don't return until the close
- * is complete. Other wise we return immediately. The
- * actually closing is done the same either way.
- */
- if (sk->linger == 0) {
- sk->prot->close(sk,0);
- sk->dead = 1;
- } else {
- DPRINTF((DBG_INET, "sk->linger set.\n"));
- sk->prot->close(sk, 0);
- cli();
- if (sk->lingertime)
- current->timeout = jiffies + HZ*sk->lingertime;
- while(sk->state != TCP_CLOSE && current->timeout>0) {
- interruptible_sleep_on(sk->sleep);
- if (current->signal & ~current->blocked) {
- break;
- #if 0
- /* not working now - closes can't be restarted */
- sti();
- current->timeout=0;
- return(-ERESTARTSYS);
- #endif
- }
- }
- current->timeout=0;
- sti();
- sk->dead = 1;
- }
- sk->inuse = 1;
-
- /* This will destroy it. */
- release_sock(sk);
- sock->data = NULL;
- DPRINTF((DBG_INET, "inet_release returning\n"));
- return(0);
- }
-
-
- /* this needs to be changed to dissallow
- the rebinding of sockets. What error
- should it return? */
-
- static int
- inet_bind(struct socket *sock, struct sockaddr *uaddr,
- int addr_len)
- {
- struct sockaddr_in addr;
- struct sock *sk, *sk2;
- unsigned short snum;
- int err;
-
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
-
- /* check this error. */
- if (sk->state != TCP_CLOSE) return(-EIO);
- if (sk->num != 0) return(-EINVAL);
-
- err=verify_area(VERIFY_READ, uaddr, addr_len);
- if(err)
- return err;
- memcpy_fromfs(&addr, uaddr, min(sizeof(addr), addr_len));
-
- snum = ntohs(addr.sin_port);
- DPRINTF((DBG_INET, "bind sk =%X to port = %d\n", sk, snum));
- sk = (struct sock *) sock->data;
-
- /*
- * We can't just leave the socket bound wherever it is, it might
- * be bound to a privileged port. However, since there seems to
- * be a bug here, we will leave it if the port is not privileged.
- */
- if (snum == 0) {
- snum = get_new_socknum(sk->prot, 0);
- }
- if (snum < PROT_SOCK && !suser()) return(-EACCES);
-
- if (addr.sin_addr.s_addr!=0 && chk_addr(addr.sin_addr.s_addr)!=IS_MYADDR)
- return(-EADDRNOTAVAIL); /* Source address MUST be ours! */
-
- if (chk_addr(addr.sin_addr.s_addr) || addr.sin_addr.s_addr == 0)
- sk->saddr = addr.sin_addr.s_addr;
-
- DPRINTF((DBG_INET, "sock_array[%d] = %X:\n", snum &(SOCK_ARRAY_SIZE -1),
- sk->prot->sock_array[snum &(SOCK_ARRAY_SIZE -1)]));
-
- /* Make sure we are allowed to bind here. */
- cli();
- outside_loop:
- for(sk2 = sk->prot->sock_array[snum & (SOCK_ARRAY_SIZE -1)];
- sk2 != NULL; sk2 = sk2->next) {
- #if 1 /* should be below! */
- if (sk2->num != snum) continue;
- /* if (sk2->saddr != sk->saddr) continue; */
- #endif
- if (sk2->dead) {
- destroy_sock(sk2);
- goto outside_loop;
- }
- if (!sk->reuse) {
- sti();
- return(-EADDRINUSE);
- }
- if (sk2->num != snum) continue; /* more than one */
- if (sk2->saddr != sk->saddr) continue; /* socket per slot ! -FB */
- if (!sk2->reuse) {
- sti();
- return(-EADDRINUSE);
- }
- }
- sti();
-
- remove_sock(sk);
- put_sock(snum, sk);
- sk->dummy_th.source = ntohs(sk->num);
- sk->daddr = 0;
- sk->dummy_th.dest = 0;
- return(0);
- }
-
-
- static int
- inet_connect(struct socket *sock, struct sockaddr * uaddr,
- int addr_len, int flags)
- {
- struct sock *sk;
- int err;
-
- sock->conn = NULL;
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
-
- if (sock->state == SS_CONNECTING && sk->state == TCP_ESTABLISHED)
- {
- sock->state = SS_CONNECTED;
- /* Connection completing after a connect/EINPROGRESS/select/connect */
- return 0; /* Rock and roll */
- }
-
- if (sock->state == SS_CONNECTING && sk->protocol == IPPROTO_TCP &&
- (flags & O_NONBLOCK))
- return -EALREADY; /* Connecting is currently in progress */
-
- if (sock->state != SS_CONNECTING) {
- /* We may need to bind the socket. */
- if (sk->num == 0) {
- sk->num = get_new_socknum(sk->prot, 0);
- if (sk->num == 0)
- return(-EAGAIN);
- put_sock(sk->num, sk);
- sk->dummy_th.source = htons(sk->num);
- }
-
- if (sk->prot->connect == NULL)
- return(-EOPNOTSUPP);
-
- err = sk->prot->connect(sk, (struct sockaddr_in *)uaddr, addr_len);
- if (err < 0) return(err);
-
- sock->state = SS_CONNECTING;
- }
-
- if (sk->state != TCP_ESTABLISHED &&(flags & O_NONBLOCK))
- return(-EINPROGRESS);
-
- cli(); /* avoid the race condition */
- while(sk->state == TCP_SYN_SENT || sk->state == TCP_SYN_RECV)
- {
- interruptible_sleep_on(sk->sleep);
- if (current->signal & ~current->blocked) {
- sti();
- return(-ERESTARTSYS);
- }
- /* This fixes a nasty in the tcp/ip code. There is a hideous hassle with
- icmp error packets wanting to close a tcp or udp socket. */
- if(sk->err && sk->protocol == IPPROTO_TCP)
- {
- sti();
- sock->state = SS_UNCONNECTED;
- err = -sk->err;
- sk->err=0;
- return err; /* set by tcp_err() */
- }
- }
- sti();
- sock->state = SS_CONNECTED;
-
- if (sk->state != TCP_ESTABLISHED && sk->err) {
- sock->state = SS_UNCONNECTED;
- err=sk->err;
- sk->err=0;
- return(-err);
- }
- return(0);
- }
-
-
- static int
- inet_socketpair(struct socket *sock1, struct socket *sock2)
- {
- return(-EOPNOTSUPP);
- }
-
-
- static int
- inet_accept(struct socket *sock, struct socket *newsock, int flags)
- {
- struct sock *sk1, *sk2;
- int err;
-
- sk1 = (struct sock *) sock->data;
- if (sk1 == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
-
- /*
- * We've been passed an extra socket.
- * We need to free it up because the tcp module creates
- * it's own when it accepts one.
- */
- if (newsock->data) kfree_s(newsock->data, sizeof(struct sock));
- newsock->data = NULL;
-
- if (sk1->prot->accept == NULL) return(-EOPNOTSUPP);
-
- /* Restore the state if we have been interrupted, and then returned. */
- if (sk1->pair != NULL ) {
- sk2 = sk1->pair;
- sk1->pair = NULL;
- } else {
- sk2 = sk1->prot->accept(sk1,flags);
- if (sk2 == NULL) {
- if (sk1->err <= 0)
- printk("Warning sock.c:sk1->err <= 0. Returning non-error.\n");
- err=sk1->err;
- sk1->err=0;
- return(-err);
- }
- }
- newsock->data = (void *)sk2;
- sk2->sleep = newsock->wait;
- newsock->conn = NULL;
- if (flags & O_NONBLOCK) return(0);
-
- cli(); /* avoid the race. */
- while(sk2->state == TCP_SYN_RECV) {
- interruptible_sleep_on(sk2->sleep);
- if (current->signal & ~current->blocked) {
- sti();
- sk1->pair = sk2;
- sk2->sleep = NULL;
- newsock->data = NULL;
- return(-ERESTARTSYS);
- }
- }
- sti();
-
- if (sk2->state != TCP_ESTABLISHED && sk2->err > 0) {
-
- err = -sk2->err;
- sk2->err=0;
- destroy_sock(sk2);
- newsock->data = NULL;
- return(err);
- }
- newsock->state = SS_CONNECTED;
- return(0);
- }
-
-
- static int
- inet_getname(struct socket *sock, struct sockaddr *uaddr,
- int *uaddr_len, int peer)
- {
- struct sockaddr_in sin;
- struct sock *sk;
- int len;
- int err;
-
-
- err = verify_area(VERIFY_WRITE,uaddr_len,sizeof(long));
- if(err)
- return err;
-
- len=get_fs_long(uaddr_len);
-
- err = verify_area(VERIFY_WRITE, uaddr, len);
- if(err)
- return err;
-
- /* Check this error. */
- if (len < sizeof(sin)) return(-EINVAL);
-
- sin.sin_family = AF_INET;
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
- if (peer) {
- if (!tcp_connected(sk->state)) return(-ENOTCONN);
- sin.sin_port = sk->dummy_th.dest;
- sin.sin_addr.s_addr = sk->daddr;
- } else {
- sin.sin_port = sk->dummy_th.source;
- if (sk->saddr == 0) sin.sin_addr.s_addr = my_addr();
- else sin.sin_addr.s_addr = sk->saddr;
- }
- len = sizeof(sin);
- /* verify_area(VERIFY_WRITE, uaddr, len); NOW DONE ABOVE */
- memcpy_tofs(uaddr, &sin, sizeof(sin));
- /* verify_area(VERIFY_WRITE, uaddr_len, sizeof(len)); NOW DONE ABOVE */
- put_fs_long(len, uaddr_len);
- return(0);
- }
-
-
- static int
- inet_read(struct socket *sock, char *ubuf, int size, int noblock)
- {
- struct sock *sk;
-
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
-
- /* We may need to bind the socket. */
- if (sk->num == 0) {
- sk->num = get_new_socknum(sk->prot, 0);
- if (sk->num == 0) return(-EAGAIN);
- put_sock(sk->num, sk);
- sk->dummy_th.source = ntohs(sk->num);
- }
- return(sk->prot->read(sk, (unsigned char *) ubuf, size, noblock,0));
- }
-
-
- static int
- inet_recv(struct socket *sock, void *ubuf, int size, int noblock,
- unsigned flags)
- {
- struct sock *sk;
-
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
-
- /* We may need to bind the socket. */
- if (sk->num == 0) {
- sk->num = get_new_socknum(sk->prot, 0);
- if (sk->num == 0) return(-EAGAIN);
- put_sock(sk->num, sk);
- sk->dummy_th.source = ntohs(sk->num);
- }
- return(sk->prot->read(sk, (unsigned char *) ubuf, size, noblock, flags));
- }
-
-
- static int
- inet_write(struct socket *sock, char *ubuf, int size, int noblock)
- {
- struct sock *sk;
-
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
- if (sk->shutdown & SEND_SHUTDOWN) {
- send_sig(SIGPIPE, current, 1);
- return(-EPIPE);
- }
-
- /* We may need to bind the socket. */
- if (sk->num == 0) {
- sk->num = get_new_socknum(sk->prot, 0);
- if (sk->num == 0) return(-EAGAIN);
- put_sock(sk->num, sk);
- sk->dummy_th.source = ntohs(sk->num);
- }
-
- return(sk->prot->write(sk, (unsigned char *) ubuf, size, noblock, 0));
- }
-
-
- static int
- inet_send(struct socket *sock, void *ubuf, int size, int noblock,
- unsigned flags)
- {
- struct sock *sk;
-
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
- if (sk->shutdown & SEND_SHUTDOWN) {
- send_sig(SIGPIPE, current, 1);
- return(-EPIPE);
- }
-
- /* We may need to bind the socket. */
- if (sk->num == 0) {
- sk->num = get_new_socknum(sk->prot, 0);
- if (sk->num == 0) return(-EAGAIN);
- put_sock(sk->num, sk);
- sk->dummy_th.source = ntohs(sk->num);
- }
-
- return(sk->prot->write(sk, (unsigned char *) ubuf, size, noblock, flags));
- }
-
-
- static int
- inet_sendto(struct socket *sock, void *ubuf, int size, int noblock,
- unsigned flags, struct sockaddr *sin, int addr_len)
- {
- struct sock *sk;
-
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
- if (sk->shutdown & SEND_SHUTDOWN) {
- send_sig(SIGPIPE, current, 1);
- return(-EPIPE);
- }
-
- if (sk->prot->sendto == NULL) return(-EOPNOTSUPP);
-
- /* We may need to bind the socket. */
- if (sk->num == 0) {
- sk->num = get_new_socknum(sk->prot, 0);
- if (sk->num == 0) return(-EAGAIN);
- put_sock(sk->num, sk);
- sk->dummy_th.source = ntohs(sk->num);
- }
-
- return(sk->prot->sendto(sk, (unsigned char *) ubuf, size, noblock, flags,
- (struct sockaddr_in *)sin, addr_len));
- }
-
-
- static int
- inet_recvfrom(struct socket *sock, void *ubuf, int size, int noblock,
- unsigned flags, struct sockaddr *sin, int *addr_len )
- {
- struct sock *sk;
-
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
-
- if (sk->prot->recvfrom == NULL) return(-EOPNOTSUPP);
-
- /* We may need to bind the socket. */
- if (sk->num == 0) {
- sk->num = get_new_socknum(sk->prot, 0);
- if (sk->num == 0) return(-EAGAIN);
- put_sock(sk->num, sk);
- sk->dummy_th.source = ntohs(sk->num);
- }
-
- return(sk->prot->recvfrom(sk, (unsigned char *) ubuf, size, noblock, flags,
- (struct sockaddr_in*)sin, addr_len));
- }
-
-
- static int
- inet_shutdown(struct socket *sock, int how)
- {
- struct sock *sk;
-
- /*
- * This should really check to make sure
- * the socket is a TCP socket.
- */
- how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
- 1->2 bit 2 snds.
- 2->3 */
- if (how & ~SHUTDOWN_MASK) return(-EINVAL);
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
- if (sock->state == SS_CONNECTING && sk->state == TCP_ESTABLISHED)
- sock->state = SS_CONNECTED;
-
- if (!tcp_connected(sk->state)) return(-ENOTCONN);
- sk->shutdown |= how;
- if (sk->prot->shutdown) sk->prot->shutdown(sk, how);
- return(0);
- }
-
-
- static int
- inet_select(struct socket *sock, int sel_type, select_table *wait )
- {
- struct sock *sk;
-
- sk = (struct sock *) sock->data;
- if (sk == NULL) {
- printk("Warning: sock->data = NULL: %d\n" ,__LINE__);
- return(0);
- }
-
- if (sk->prot->select == NULL) {
- DPRINTF((DBG_INET, "select on non-selectable socket.\n"));
- return(0);
- }
- return(sk->prot->select(sk, sel_type, wait));
- }
-
-
- static int
- inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
- {
- struct sock *sk;
- int err;
-
- DPRINTF((DBG_INET, "INET: in inet_ioctl\n"));
- sk = NULL;
- if (sock && (sk = (struct sock *) sock->data) == NULL) {
- printk("AF_INET: Warning: sock->data = NULL: %d\n" , __LINE__);
- return(0);
- }
-
- switch(cmd) {
- case FIOSETOWN:
- case SIOCSPGRP:
- err=verify_area(VERIFY_READ,(int *)arg,sizeof(long));
- if(err)
- return err;
- if (sk)
- sk->proc = get_fs_long((int *) arg);
- return(0);
- case FIOGETOWN:
- case SIOCGPGRP:
- if (sk) {
- err=verify_area(VERIFY_WRITE,(void *) arg, sizeof(long));
- if(err)
- return err;
- put_fs_long(sk->proc,(int *)arg);
- }
- return(0);
- #if 0 /* FIXME: */
- case SIOCATMARK:
- printk("AF_INET: ioctl(SIOCATMARK, 0x%08X)\n",(void *) arg);
- return(-EINVAL);
- #endif
-
- case DDIOCSDBG:
- return(dbg_ioctl((void *) arg, DBG_INET));
-
- case SIOCADDRT: case SIOCADDRTOLD:
- case SIOCDELRT: case SIOCDELRTOLD:
- return(rt_ioctl(cmd,(void *) arg));
-
- case SIOCDARP:
- case SIOCGARP:
- case SIOCSARP:
- return(arp_ioctl(cmd,(void *) arg));
-
- case IP_SET_DEV:
- case SIOCGIFCONF:
- case SIOCGIFFLAGS:
- case SIOCSIFFLAGS:
- case SIOCGIFADDR:
- case SIOCSIFADDR:
- case SIOCGIFDSTADDR:
- case SIOCSIFDSTADDR:
- case SIOCGIFBRDADDR:
- case SIOCSIFBRDADDR:
- case SIOCGIFNETMASK:
- case SIOCSIFNETMASK:
- case SIOCGIFMETRIC:
- case SIOCSIFMETRIC:
- case SIOCGIFMEM:
- case SIOCSIFMEM:
- case SIOCGIFMTU:
- case SIOCSIFMTU:
- case SIOCSIFLINK:
- case SIOCGIFHWADDR:
- return(dev_ioctl(cmd,(void *) arg));
-
- default:
- if (!sk || !sk->prot->ioctl) return(-EINVAL);
- return(sk->prot->ioctl(sk, cmd, arg));
- }
- /*NOTREACHED*/
- return(0);
- }
-
-
- struct sk_buff *
- sock_wmalloc(struct sock *sk, unsigned long size, int force,
- int priority)
- {
- if (sk) {
- if (sk->wmem_alloc + size < sk->sndbuf || force) {
- struct sk_buff * c = alloc_skb(size, priority);
- if (c) {
- cli();
- sk->wmem_alloc+= size;
- sti();
- }
- return c;
- }
- DPRINTF((DBG_INET, "sock_wmalloc(%X,%d,%d,%d) returning NULL\n",
- sk, size, force, priority));
- return(NULL);
- }
- return(alloc_skb(size, priority));
- }
-
-
- struct sk_buff *
- sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority)
- {
- if (sk) {
- if (sk->rmem_alloc + size < sk->rcvbuf || force) {
- struct sk_buff *c = alloc_skb(size, priority);
- if (c) {
- cli();
- sk->rmem_alloc += size;
- sti();
- }
- return(c);
- }
- DPRINTF((DBG_INET, "sock_rmalloc(%X,%d,%d,%d) returning NULL\n",
- sk,size,force, priority));
- return(NULL);
- }
- return(alloc_skb(size, priority));
- }
-
-
- unsigned long
- sock_rspace(struct sock *sk)
- {
- int amt;
-
- if (sk != NULL) {
- if (sk->rmem_alloc >= sk->rcvbuf-2*MIN_WINDOW) return(0);
- amt = min((sk->rcvbuf-sk->rmem_alloc)/2-MIN_WINDOW, MAX_WINDOW);
- if (amt < 0) return(0);
- return(amt);
- }
- return(0);
- }
-
-
- unsigned long
- sock_wspace(struct sock *sk)
- {
- if (sk != NULL) {
- if (sk->shutdown & SEND_SHUTDOWN) return(0);
- if (sk->wmem_alloc >= sk->sndbuf) return(0);
- return(sk->sndbuf-sk->wmem_alloc );
- }
- return(0);
- }
-
-
- void
- sock_wfree(struct sock *sk, void *mem, unsigned long size)
- {
- DPRINTF((DBG_INET, "sock_wfree(sk=%X, mem=%X, size=%d)\n", sk, mem, size));
-
- IS_SKB(mem);
- kfree_skbmem(mem, size);
- if (sk) {
- sk->wmem_alloc -= size;
-
- /* In case it might be waiting for more memory. */
- if (!sk->dead) sk->write_space(sk);
- if (sk->destroy && sk->wmem_alloc == 0 && sk->rmem_alloc == 0) {
- DPRINTF((DBG_INET,
- "recovered lost memory, sock = %X\n", sk));
- }
- return;
- }
- }
-
-
- void
- sock_rfree(struct sock *sk, void *mem, unsigned long size)
- {
- DPRINTF((DBG_INET, "sock_rfree(sk=%X, mem=%X, size=%d)\n", sk, mem, size));
- IS_SKB(mem);
- kfree_skbmem(mem, size);
- if (sk) {
- sk->rmem_alloc -= size;
- if (sk->destroy && sk->wmem_alloc == 0 && sk->rmem_alloc == 0) {
- DPRINTF((DBG_INET,
- "recovered lot memory, sock = %X\n", sk));
- }
- }
- }
-
-
- /*
- * This routine must find a socket given a TCP or UDP header.
- * Everyhting is assumed to be in net order.
- */
- struct sock *get_sock(struct proto *prot, unsigned short num,
- unsigned long raddr,
- unsigned short rnum, unsigned long laddr)
- {
- struct sock *s;
- unsigned short hnum;
-
- hnum = ntohs(num);
- DPRINTF((DBG_INET, "get_sock(prot=%X, num=%d, raddr=%X, rnum=%d, laddr=%X)\n",
- prot, num, raddr, rnum, laddr));
-
- /*
- * SOCK_ARRAY_SIZE must be a power of two. This will work better
- * than a prime unless 3 or more sockets end up using the same
- * array entry. This should not be a problem because most
- * well known sockets don't overlap that much, and for
- * the other ones, we can just be careful about picking our
- * socket number when we choose an arbitrary one.
- */
- for(s = prot->sock_array[hnum & (SOCK_ARRAY_SIZE - 1)];
- s != NULL; s = s->next)
- {
- if (s->num != hnum)
- continue;
- if(s->dead && (s->state == TCP_CLOSE))
- continue;
- if(prot == &udp_prot)
- return s;
- if(ip_addr_match(s->daddr,raddr)==0)
- continue;
- if (s->dummy_th.dest != rnum && s->dummy_th.dest != 0)
- continue;
- if(ip_addr_match(s->saddr,laddr) == 0)
- continue;
- return(s);
- }
- return(NULL);
- }
-
-
- void release_sock(struct sock *sk)
- {
- if (!sk) {
- printk("sock.c: release_sock sk == NULL\n");
- return;
- }
- if (!sk->prot) {
- /* printk("sock.c: release_sock sk->prot == NULL\n"); */
- return;
- }
-
- if (sk->blog) return;
-
- /* See if we have any packets built up. */
- cli();
- sk->inuse = 1;
- while(sk->back_log != NULL) {
- struct sk_buff *skb;
-
- sk->blog = 1;
- skb =(struct sk_buff *)sk->back_log;
- DPRINTF((DBG_INET, "release_sock: skb = %X:\n", skb));
- if (skb->next != skb) {
- sk->back_log = skb->next;
- skb->prev->next = skb->next;
- skb->next->prev = skb->prev;
- } else {
- sk->back_log = NULL;
- }
- sti();
- DPRINTF((DBG_INET, "sk->back_log = %X\n", sk->back_log));
- if (sk->prot->rcv) sk->prot->rcv(skb, skb->dev, sk->opt,
- skb->saddr, skb->len, skb->daddr, 1,
-
- /* Only used for/by raw sockets. */
- (struct inet_protocol *)sk->pair);
- cli();
- }
- sk->blog = 0;
- sk->inuse = 0;
- sti();
- if (sk->dead && sk->state == TCP_CLOSE) {
- /* Should be about 2 rtt's */
- reset_timer(sk, TIME_DONE, min(sk->rtt * 2, TCP_DONE_TIME));
- }
- }
-
-
- static int
- inet_fioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
- {
- int minor, ret;
-
- /* Extract the minor number on which we work. */
- minor = MINOR(inode->i_rdev);
- if (minor != 0) return(-ENODEV);
-
- /* Now dispatch on the minor device. */
- switch(minor) {
- case 0: /* INET */
- ret = inet_ioctl(NULL, cmd, arg);
- break;
- case 1: /* IP */
- ret = ip_ioctl(NULL, cmd, arg);
- break;
- case 2: /* ICMP */
- ret = icmp_ioctl(NULL, cmd, arg);
- break;
- case 3: /* TCP */
- ret = tcp_ioctl(NULL, cmd, arg);
- break;
- case 4: /* UDP */
- ret = udp_ioctl(NULL, cmd, arg);
- break;
- default:
- ret = -ENODEV;
- }
-
- return(ret);
- }
-
-
-
-
- static struct file_operations inet_fops = {
- NULL, /* LSEEK */
- NULL, /* READ */
- NULL, /* WRITE */
- NULL, /* READDIR */
- NULL, /* SELECT */
- inet_fioctl, /* IOCTL */
- NULL, /* MMAP */
- NULL, /* OPEN */
- NULL /* CLOSE */
- };
-
-
- static struct proto_ops inet_proto_ops = {
- AF_INET,
-
- inet_create,
- inet_dup,
- inet_release,
- inet_bind,
- inet_connect,
- inet_socketpair,
- inet_accept,
- inet_getname,
- inet_read,
- inet_write,
- inet_select,
- inet_ioctl,
- inet_listen,
- inet_send,
- inet_recv,
- inet_sendto,
- inet_recvfrom,
- inet_shutdown,
- inet_setsockopt,
- inet_getsockopt,
- inet_fcntl,
- };
-
- extern unsigned long seq_offset;
-
- /* Called by ddi.c on kernel startup. */
- void inet_proto_init(struct ddi_proto *pro)
- {
- struct inet_protocol *p;
- int i;
-
- printk("Swansea University Computer Society Net2Debugged [1.30]\n");
- /* Set up our UNIX VFS major device. */
- if (register_chrdev(AF_INET_MAJOR, "af_inet", &inet_fops) < 0) {
- printk("%s: cannot register major device %d!\n",
- pro->name, AF_INET_MAJOR);
- return;
- }
-
- /* Tell SOCKET that we are alive... */
- (void) sock_register(inet_proto_ops.family, &inet_proto_ops);
-
- seq_offset = CURRENT_TIME*250;
-
- /* Add all the protocols. */
- for(i = 0; i < SOCK_ARRAY_SIZE; i++) {
- tcp_prot.sock_array[i] = NULL;
- udp_prot.sock_array[i] = NULL;
- raw_prot.sock_array[i] = NULL;
- }
- printk("IP Protocols: ");
- for(p = inet_protocol_base; p != NULL;) {
- struct inet_protocol *tmp;
-
- tmp = (struct inet_protocol *) p->next;
- inet_add_protocol(p);
- printk("%s%s",p->name,tmp?", ":"\n");
- p = tmp;
- }
-
- /* Initialize the DEV module. */
- dev_init();
-
- /* Initialize the "Buffer Head" pointers. */
- bh_base[INET_BH].routine = inet_bh;
- }
-