610 lines
16 KiB
C
610 lines
16 KiB
C
/*
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* Copyright (c) 1998 Luigi Rizzo
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*
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* Redistribution and use in source forms, with and without modification,
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* are permitted provided that this entire comment appears intact.
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*
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* Redistribution in binary form may occur without any restrictions.
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* Obviously, it would be nice if you gave credit where credit is due
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* but requiring it would be too onerous.
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*
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* $Id: ip_dummynet.c 1.2 1998/08/21 15:01:13 luigi Exp $
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*/
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/*
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* This module implements IP dummynet, a bandwidth limiter/delay emulator
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* used in conjunction with the ipfw package.
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*
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* Changes:
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*
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* 980821: changed conventions in the queueing logic
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* packets passed from dummynet to ip_in/out are prepended with
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* a vestigial mbuf type MT_DUMMYNET which contains a pointer
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* to the matching rule.
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* ip_input/output will extract the parameters, free the vestigial mbuf,
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* and do the processing.
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*
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* 980519: fixed behaviour when deleting rules.
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* 980518: added splimp()/splx() to protect against races
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* 980513: initial release
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*/
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/* include files marked with XXX are probably not needed */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/queue.h> /* XXX */
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_fw.h>
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#include <netinet/ip_dummynet.h>
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#ifdef BRIDGE
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#include <netinet/if_ether.h> /* for struct arpcom */
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#include <net/bridge.h>
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#endif
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static struct dn_pipe *all_pipes = NULL ; /* list of all pipes */
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static int dn_debug = 0 ; /* verbose */
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static int dn_calls = 0 ; /* number of calls */
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static int dn_idle = 1;
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#ifdef SYSCTL_NODE
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SYSCTL_NODE(_net_inet_ip, OID_AUTO, dummynet, CTLFLAG_RW, 0, "Dummynet");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, debug, CTLFLAG_RW, &dn_debug, 0, "");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, calls, CTLFLAG_RD, &dn_calls, 0, "");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, idle, CTLFLAG_RD, &dn_idle, 0, "");
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#endif
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static int ip_dn_ctl(int optname, struct mbuf **mm);
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static void dummynet(void);
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static void dn_restart(void);
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static void dn_move(struct dn_pipe *pipe, int immediate);
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/*
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* the following is needed when deleting a pipe, because rules can
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* hold references to the pipe.
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*/
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extern LIST_HEAD (ip_fw_head, ip_fw_chain) ip_fw_chain;
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/*
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* invoked to reschedule the periodic task if necessary.
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* Should only be called when dn_idle = 1 ;
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*/
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static void
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dn_restart()
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{
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struct dn_pipe *pipe;
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if (!dn_idle)
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return;
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for (pipe = all_pipes ; pipe ; pipe = pipe->next ) {
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/* if there any pipe that needs work, restart */
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if (pipe->r.head || pipe->p.head || pipe->numbytes < 0 ) {
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dn_idle = 0;
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timeout(dummynet, (caddr_t)NULL, 1);
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return ;
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}
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}
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}
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/*
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* move packets from R-queue to P-queue
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*/
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static void
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dn_move(struct dn_pipe *pipe, int immediate)
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{
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struct dn_pkt *tmp, *pkt;
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/*
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* consistency check, should catch new pipes which are
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* not initialized properly.
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*/
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if ( pipe->p.head == NULL &&
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pipe->ticks_from_last_insert != pipe->delay) {
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printf("Warning, empty pipe and delay %d (should be %a)d\n",
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pipe->ticks_from_last_insert, pipe->delay);
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pipe->ticks_from_last_insert = pipe->delay;
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}
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/* this ought to go in dn_dequeue() */
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if (!immediate && pipe->ticks_from_last_insert < pipe->delay)
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pipe->ticks_from_last_insert++;
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if ( pkt = pipe->r.head ) {
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/*
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* Move at most numbytes bytes from src and move to dst.
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* delay is set to ticks_from_last_insert, which
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* is reset after the first insertion;
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*/
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while ( pkt ) {
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struct ip *ip=mtod(pkt->dn_m, struct ip *);
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/*
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* queue limitation: pass packets down if the len is
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* such that the pkt would go out before the next tick.
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*/
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if (pipe->bandwidth) {
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if (pipe->numbytes < ip->ip_len)
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break;
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pipe->numbytes -= ip->ip_len;
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}
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pipe->r_len--; /* elements in queue */
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pipe->r_len_bytes -= ip->ip_len ;
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/*
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* to add delay jitter, must act here. A lower value
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* (bounded to 0) means lower delay.
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*/
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pkt->delay = pipe->ticks_from_last_insert;
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pipe->ticks_from_last_insert = 0;
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/* compensate the decrement done next in dn_dequeue */
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if (!immediate && pkt->delay >0 && pipe->p.head==NULL)
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pkt->delay++;
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if (pipe->p.head == NULL)
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pipe->p.head = pkt;
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else
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(struct dn_pkt *)pipe->p.tail->dn_next = pkt;
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pipe->p.tail = pkt;
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pkt = (struct dn_pkt *)pkt->dn_next;
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pipe->p.tail->dn_next = NULL;
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}
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pipe->r.head = pkt;
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/*** XXX just a sanity check */
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if ( ( pkt == NULL && pipe->r_len != 0) ||
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( pkt != NULL && pipe->r_len == 0) )
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printf("-- Warning, pipe head %x len %d\n",
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pkt, pipe->r_len);
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}
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/*
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* deliver packets downstream after the delay in the P-queue.
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*/
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if (pipe->p.head == NULL)
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return;
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if (!immediate)
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pipe->p.head->delay--;
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while ( (pkt = pipe->p.head) && pkt->delay < 1) {
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/*
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* first unlink, then call procedures since ip_input()
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* can result in a call to ip_output cnd viceversa,
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* thus causing nested calls
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*/
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pipe->p.head = (struct dn_pkt *) pkt->dn_next ;
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/*
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* the trick to avoid flow-id settings here is to prepend a
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* vestigial mbuf to the packet, with the following values:
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* m_type = MT_DUMMYNET
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* m_next = the actual mbuf to be processed by ip_input/output
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* m_data = the matching rule
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* The vestigial element is the same memory area used by
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* the dn_pkt, and IS FREED IN ip_input/ip_output. IT IS
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* NOT A REAL MBUF, just a block of memory acquired with malloc().
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*/
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switch (pkt->dn_dir) {
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case DN_TO_IP_OUT: {
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struct rtentry *tmp_rt = pkt->ro.ro_rt ;
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(void)ip_output((struct mbuf *)pkt, (struct mbuf *)pkt->ifp,
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&(pkt->ro), pkt->dn_hlen, NULL);
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if (tmp_rt)
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tmp_rt->rt_refcnt--; /* XXX return a reference count */
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}
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break ;
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case DN_TO_IP_IN :
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ip_input((struct mbuf *)pkt) ;
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break ;
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#ifdef BRIDGE
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case DN_TO_BDG_FWD :
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bdg_forward((struct mbuf **)&pkt, pkt->ifp);
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break ;
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#endif
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default:
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printf("dummynet: bad switch %d!\n", pkt->dn_dir);
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m_freem(pkt->dn_m);
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FREE(pkt, M_IPFW);
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break ;
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}
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}
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}
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/*
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* this is the periodic task that moves packets between the R-
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* and the P- queue
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*/
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void
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dummynet()
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{
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struct dn_pipe *p ;
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int s ;
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dn_calls++ ;
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for (p = all_pipes ; p ; p = p->next ) {
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/*
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* Increment the amount of data that can be sent. However,
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* don't do that if the channel is idle
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* (r.head == NULL && numbytes >= bandwidth).
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* This bug fix is from tim shepard (shep@bbn.com)
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*/
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s = splimp();
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if (p->r.head != NULL || p->numbytes < p->bandwidth )
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p->numbytes += p->bandwidth ;
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dn_move(p, 0); /* is it really 0 (also below) ? */
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splx(s);
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}
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/*
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* finally, if some queue has data, restart the timer.
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*/
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dn_idle = 1;
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dn_restart();
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}
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/*
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* dummynet hook for packets.
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* input and output use the same code, so i use bit 16 in the pipe
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* number to chose the direction: 1 for output packets, 0 for input.
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* for input, only m is significant. For output, also the others.
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*/
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int
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dummynet_io(int pipe_nr, int dir,
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struct mbuf *m, struct ifnet *ifp, struct route *ro, int hlen,
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struct ip_fw_chain *rule)
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{
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struct dn_pkt *pkt;
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struct dn_pipe *pipe;
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struct ip *ip=mtod(m, struct ip *);
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int s=splimp();
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pipe_nr &= 0xffff ;
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/*
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* locate pipe. First time is expensive, next have direct access.
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*/
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if ( (pipe = rule->rule->pipe_ptr) == NULL ) {
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for (pipe=all_pipes; pipe && pipe->pipe_nr !=pipe_nr; pipe=pipe->next)
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;
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if (pipe == NULL) {
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splx(s);
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if (dn_debug)
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printf("warning, pkt for no pipe %d\n", pipe_nr);
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m_freem(m);
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return 0 ;
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} else
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rule->rule->pipe_ptr = pipe ;
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}
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/*
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* should i drop ?
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* This section implements random packet drop.
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*/
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if ( (pipe->plr && random() < pipe->plr) ||
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(pipe->queue_size && pipe->r_len >= pipe->queue_size) ||
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(pipe->queue_size_bytes &&
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ip->ip_len + pipe->r_len_bytes > pipe->queue_size_bytes) ||
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(pkt = (struct dn_pkt *)malloc(sizeof (*pkt),
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M_IPFW, M_NOWAIT) ) == NULL ) {
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splx(s);
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if (dn_debug)
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printf("-- dummynet: drop from pipe %d, have %d pks, %d bytes\n",
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pipe_nr, pipe->r_len, pipe->r_len_bytes);
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pipe->r_drops++ ;
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m_freem(m);
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return 0 ; /* XXX error */
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}
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/* build and enqueue packet */
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pkt->hdr.mh_type = MT_DUMMYNET ;
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(struct ip_fw_chain *)pkt->hdr.mh_data = rule ;
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pkt->dn_next = NULL;
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pkt->dn_m = m;
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pkt->dn_dir = dir ;
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pkt->delay = 0;
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pkt->ifp = ifp;
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if (dir == DN_TO_IP_OUT) {
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pkt->ro = *ro; /* XXX copied! */
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if (ro->ro_rt)
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ro->ro_rt->rt_refcnt++ ; /* XXX */
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}
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pkt->dn_hlen = hlen;
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if (pipe->r.head == NULL)
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pipe->r.head = pkt;
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else
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(struct dn_pkt *)pipe->r.tail->dn_next = pkt;
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pipe->r.tail = pkt;
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pipe->r_len++;
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pipe->r_len_bytes += ip->ip_len ;
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/*
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* here we could implement RED if we like to
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*/
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if (pipe->r.head == pkt) { /* process immediately */
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dn_move(pipe, 1);
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}
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splx(s);
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if (dn_idle)
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dn_restart();
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return 0;
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}
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/*
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* dispose all packets queued on a pipe
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*/
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static void
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purge_pipe(struct dn_pipe *pipe)
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{
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struct dn_pkt *pkt, *n ;
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struct rtentry *tmp_rt ;
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for (pkt = pipe->r.head ; pkt ; ) {
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if (tmp_rt = pkt->ro.ro_rt )
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tmp_rt->rt_refcnt--; /* XXX return a reference count */
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m_freem(pkt->dn_m);
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n = pkt ;
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pkt = (struct dn_pkt *)pkt->dn_next ;
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free(n, M_IPFW) ;
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}
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for (pkt = pipe->p.head ; pkt ; ) {
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if (tmp_rt = pkt->ro.ro_rt )
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tmp_rt->rt_refcnt--; /* XXX return a reference count */
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m_freem(pkt->dn_m);
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n = pkt ;
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pkt = (struct dn_pkt *)pkt->dn_next ;
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free(n, M_IPFW) ;
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}
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}
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/*
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* delete all pipes returning memory
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*/
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static void
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dummynet_flush()
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{
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struct dn_pipe *q, *p = all_pipes ;
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int s = splnet() ;
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all_pipes = NULL ;
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splx(s) ;
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/*
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* purge all queued pkts and delete all pipes
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*/
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for ( ; p ; ) {
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purge_pipe(p);
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q = p ;
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p = p->next ;
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free(q, M_IPFW);
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}
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}
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extern struct ip_fw_chain *ip_fw_default_rule ;
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/*
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* when a firewall rule is deleted, scan all pipes and remove the flow-id
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* from packets matching this rule.
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*/
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void
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dn_rule_delete(void *r)
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{
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struct dn_pipe *q, *p = all_pipes ;
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for ( p= all_pipes ; p ; p = p->next ) {
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struct dn_pkt *x ;
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for (x = p->r.head ; x ; x = (struct dn_pkt *)x->dn_next )
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if (x->hdr.mh_data == r)
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x->hdr.mh_data = (void *)ip_fw_default_rule ;
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for (x = p->p.head ; x ; x = (struct dn_pkt *)x->dn_next )
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if (x->hdr.mh_data == r)
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x->hdr.mh_data = (void *)ip_fw_default_rule ;
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}
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}
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/*
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* handler for the various dummynet socket options
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* (get, flush, config, del)
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*/
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static int
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ip_dn_ctl(int optname, struct mbuf **mm)
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{
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struct mbuf *m ;
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if (optname == IP_DUMMYNET_GET) {
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struct dn_pipe *p = all_pipes ;
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*mm = m = m_get(M_WAIT, MT_SOOPTS);
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m->m_len = 0 ;
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m->m_next = NULL ;
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for (; p ; p = p->next ) {
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struct dn_pipe *q = mtod(m,struct dn_pipe *) ;
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memcpy( m->m_data, p, sizeof(*p) );
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/*
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* return bw and delay in bits/s and ms, respectively
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*/
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q->bandwidth *= (8*hz) ;
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q->delay = (q->delay * 1000) / hz ;
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m->m_len = sizeof(*p) ;
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m->m_next = m_get(M_WAIT, MT_SOOPTS);
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m = m->m_next ;
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m->m_len = 0 ;
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}
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return 0 ;
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}
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if (securelevel > 2) { /* like in the firewall code... */
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if (m) (void)m_free(m);
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return (EPERM) ;
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}
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m = *mm ;
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if (optname == IP_DUMMYNET_FLUSH) {
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dummynet_flush() ;
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if (m) (void)m_free(m);
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return 0 ;
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}
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if (!m) /* need an argument for the following */
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return (EINVAL);
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if (optname == IP_DUMMYNET_CONFIGURE) {
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struct dn_pipe *p = mtod(m,struct dn_pipe *) ;
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struct dn_pipe *x, *a, *b ;
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if (m->m_len != sizeof (*p) ) {
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printf("dn_pipe Invalid length, %d instead of %d\n",
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m->m_len, sizeof(*p) );
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(void)m_free(m);
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return (EINVAL);
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}
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/*
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* The config program passes parameters as follows:
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* bandwidth = bits/second (0 = no limits);
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* must be translated in bytes/tick.
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* delay = ms
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* must be translated in ticks.
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* queue_size = slots (0 = no limit)
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* queue_size_bytes = bytes (0 = no limit)
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* only one can be set, must be bound-checked
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*/
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if ( p->bandwidth > 0 ) {
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p->bandwidth = p->bandwidth / 8 / hz ;
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if (p->bandwidth == 0) /* too little does not make sense! */
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p->bandwidth = 10 ;
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}
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p->delay = ( p->delay * hz ) / 1000 ;
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if (p->queue_size == 0 && p->queue_size_bytes == 0)
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p->queue_size = 100 ;
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if (p->queue_size != 0 ) /* buffers are prevailing */
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p->queue_size_bytes = 0 ;
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if (p->queue_size > 100)
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p->queue_size = 100 ;
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if (p->queue_size_bytes > 1024*1024)
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p->queue_size_bytes = 1024*1024 ;
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#if 0
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printf("ip_dn: config pipe %d %d bit/s %d ms %d bufs\n",
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p->pipe_nr,
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p->bandwidth * 8 * hz ,
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p->delay * 1000 / hz , p->queue_size);
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#endif
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for (a = NULL , b = all_pipes ; b && b->pipe_nr < p->pipe_nr ;
|
|
a = b , b = b->next) ;
|
|
if (b && b->pipe_nr == p->pipe_nr) {
|
|
/* XXX should spl and flush old pipe... */
|
|
b->bandwidth = p->bandwidth ;
|
|
b->delay = p->delay ;
|
|
b->ticks_from_last_insert = p->delay ;
|
|
b->queue_size = p->queue_size ;
|
|
b->queue_size_bytes = p->queue_size_bytes ;
|
|
b->plr = p->plr ;
|
|
} else {
|
|
int s ;
|
|
x = malloc(sizeof(struct dn_pipe), M_IPFW, M_DONTWAIT) ;
|
|
if (x == NULL) {
|
|
printf("ip_dummynet.c: sorry no memory\n");
|
|
return (ENOSPC) ;
|
|
}
|
|
bzero(x, sizeof(*x) );
|
|
x->bandwidth = p->bandwidth ;
|
|
x->delay = p->delay ;
|
|
x->ticks_from_last_insert = p->delay ;
|
|
x->pipe_nr = p->pipe_nr ;
|
|
x->queue_size = p->queue_size ;
|
|
x->queue_size_bytes = p->queue_size_bytes ;
|
|
x->plr = p->plr ;
|
|
|
|
s = splnet() ;
|
|
x->next = b ;
|
|
if (a == NULL)
|
|
all_pipes = x ;
|
|
else
|
|
a->next = x ;
|
|
splx(s);
|
|
}
|
|
(void)m_free(m);
|
|
return 0 ;
|
|
}
|
|
if (optname == IP_DUMMYNET_DEL) {
|
|
struct dn_pipe *p = mtod(m,struct dn_pipe *) ;
|
|
struct dn_pipe *x, *a, *b ;
|
|
|
|
for (a = NULL , b = all_pipes ; b && b->pipe_nr < p->pipe_nr ;
|
|
a = b , b = b->next) ;
|
|
if (b && b->pipe_nr == p->pipe_nr) { /* found pipe */
|
|
int s = splnet() ;
|
|
struct ip_fw_chain *chain = ip_fw_chain.lh_first;
|
|
|
|
if (a == NULL)
|
|
all_pipes = b->next ;
|
|
else
|
|
a->next = b->next ;
|
|
/*
|
|
* remove references to this pipe from the ip_fw rules.
|
|
*/
|
|
for (; chain; chain = chain->chain.le_next) {
|
|
register struct ip_fw *const f = chain->rule;
|
|
if (f->pipe_ptr == b)
|
|
f->pipe_ptr = NULL ;
|
|
}
|
|
splx(s);
|
|
purge_pipe(b); /* remove pkts from here */
|
|
free(b, M_IPFW);
|
|
}
|
|
}
|
|
return 0 ;
|
|
}
|
|
|
|
void
|
|
ip_dn_init(void)
|
|
{
|
|
printf("DUMMYNET initialized (980901) -- size dn_pkt %d\n",
|
|
sizeof(struct dn_pkt));
|
|
all_pipes = NULL ;
|
|
ip_dn_ctl_ptr = ip_dn_ctl;
|
|
}
|
|
|
|
#ifdef DUMMYNET_MODULE
|
|
|
|
#include <sys/exec.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/lkm.h>
|
|
|
|
MOD_MISC(dummynet);
|
|
|
|
static ip_dn_ctl_t *old_dn_ctl_ptr ;
|
|
|
|
static int
|
|
dummynet_load(struct lkm_table *lkmtp, int cmd)
|
|
{
|
|
int s=splnet();
|
|
old_dn_ctl_ptr = ip_dn_ctl_ptr;
|
|
ip_dn_init();
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
dummynet_unload(struct lkm_table *lkmtp, int cmd)
|
|
{
|
|
int s=splnet();
|
|
ip_dn_ctl_ptr = old_dn_ctl_ptr;
|
|
splx(s);
|
|
dummynet_flush();
|
|
printf("DUMMYNET unloaded\n");
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
dummynet_mod(struct lkm_table *lkmtp, int cmd, int ver)
|
|
{
|
|
DISPATCH(lkmtp, cmd, ver, dummynet_load, dummynet_unload, lkm_nullcmd);
|
|
}
|
|
#endif
|