| if_tun.c (83805) | if_tun.c (90227) |
|---|---|
| 1/* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd Exp $ */ 2 3/* 4 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> 5 * Nottingham University 1987. 6 * 7 * This source may be freely distributed, however I would be interested 8 * in any changes that are made. 9 * 10 * This driver takes packets off the IP i/f and hands them up to a 11 * user process to have its wicked way with. This driver has it's 12 * roots in a similar driver written by Phil Cockcroft (formerly) at 13 * UCL. This driver is based much more on read/write/poll mode of 14 * operation though. 15 * | 1/* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd Exp $ */ 2 3/* 4 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> 5 * Nottingham University 1987. 6 * 7 * This source may be freely distributed, however I would be interested 8 * in any changes that are made. 9 * 10 * This driver takes packets off the IP i/f and hands them up to a 11 * user process to have its wicked way with. This driver has it's 12 * roots in a similar driver written by Phil Cockcroft (formerly) at 13 * UCL. This driver is based much more on read/write/poll mode of 14 * operation though. 15 * |
| 16 * $FreeBSD: head/sys/net/if_tun.c 83805 2001-09-21 22:46:54Z jhb $ | 16 * $FreeBSD: head/sys/net/if_tun.c 90227 2002-02-05 02:00:56Z dillon $ |
| 17 */ 18 19#include "opt_inet.h" 20 21#include <sys/param.h> 22#include <sys/proc.h> 23#include <sys/systm.h> 24#include <sys/mbuf.h> --- 606 unchanged lines hidden (view full) --- 631 * The cdevsw read interface - reads a packet at a time, or at 632 * least as much of a packet as can be read. 633 */ 634static int 635tunread(dev_t dev, struct uio *uio, int flag) 636{ 637 struct tun_softc *tp = dev->si_drv1; 638 struct ifnet *ifp = &tp->tun_if; | 17 */ 18 19#include "opt_inet.h" 20 21#include <sys/param.h> 22#include <sys/proc.h> 23#include <sys/systm.h> 24#include <sys/mbuf.h> --- 606 unchanged lines hidden (view full) --- 631 * The cdevsw read interface - reads a packet at a time, or at 632 * least as much of a packet as can be read. 633 */ 634static int 635tunread(dev_t dev, struct uio *uio, int flag) 636{ 637 struct tun_softc *tp = dev->si_drv1; 638 struct ifnet *ifp = &tp->tun_if; |
| 639 struct mbuf *m, *m0; | 639 struct mbuf *m; |
| 640 int error=0, len, s; 641 642 TUNDEBUG ("%s%d: read\n", ifp->if_name, ifp->if_unit); 643 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 644 TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name, 645 ifp->if_unit, tp->tun_flags); 646 return EHOSTDOWN; 647 } 648 649 tp->tun_flags &= ~TUN_RWAIT; 650 651 s = splimp(); 652 do { | 640 int error=0, len, s; 641 642 TUNDEBUG ("%s%d: read\n", ifp->if_name, ifp->if_unit); 643 if ((tp->tun_flags & TUN_READY) != TUN_READY) { 644 TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name, 645 ifp->if_unit, tp->tun_flags); 646 return EHOSTDOWN; 647 } 648 649 tp->tun_flags &= ~TUN_RWAIT; 650 651 s = splimp(); 652 do { |
| 653 IF_DEQUEUE(&ifp->if_snd, m0); 654 if (m0 == 0) { | 653 IF_DEQUEUE(&ifp->if_snd, m); 654 if (m == NULL) { |
| 655 if (flag & IO_NDELAY) { 656 splx(s); 657 return EWOULDBLOCK; 658 } 659 tp->tun_flags |= TUN_RWAIT; 660 if((error = tsleep((caddr_t)tp, PCATCH | (PZERO + 1), 661 "tunread", 0)) != 0) { 662 splx(s); 663 return error; 664 } 665 } | 655 if (flag & IO_NDELAY) { 656 splx(s); 657 return EWOULDBLOCK; 658 } 659 tp->tun_flags |= TUN_RWAIT; 660 if((error = tsleep((caddr_t)tp, PCATCH | (PZERO + 1), 661 "tunread", 0)) != 0) { 662 splx(s); 663 return error; 664 } 665 } |
| 666 } while (m0 == 0); | 666 } while (m == NULL); |
| 667 splx(s); 668 | 667 splx(s); 668 |
| 669 while (m0 && uio->uio_resid > 0 && error == 0) { 670 len = min(uio->uio_resid, m0->m_len); | 669 while (m && uio->uio_resid > 0 && error == 0) { 670 len = min(uio->uio_resid, m->m_len); |
| 671 if (len != 0) | 671 if (len != 0) |
| 672 error = uiomove(mtod(m0, caddr_t), len, uio); 673 MFREE(m0, m); 674 m0 = m; | 672 error = uiomove(mtod(m, caddr_t), len, uio); 673 m = m_free(m); |
| 675 } 676 | 674 } 675 |
| 677 if (m0) { | 676 if (m) { |
| 678 TUNDEBUG("%s%d: Dropping mbuf\n", ifp->if_name, ifp->if_unit); | 677 TUNDEBUG("%s%d: Dropping mbuf\n", ifp->if_name, ifp->if_unit); |
| 679 m_freem(m0); | 678 m_freem(m); |
| 680 } 681 return error; 682} 683 684/* 685 * the cdevsw write interface - an atomic write is a packet - or else! 686 */ 687static int --- 133 unchanged lines hidden --- | 679 } 680 return error; 681} 682 683/* 684 * the cdevsw write interface - an atomic write is a packet - or else! 685 */ 686static int --- 133 unchanged lines hidden --- |