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1905 lines
54 KiB
C
1905 lines
54 KiB
C
/*
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* Copyright (c) 1998-2001 Luigi Rizzo, Universita` di Pisa
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* Portions Copyright (c) 2000 Akamba Corp.
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* All rights reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#define DEB(x)
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#define DDB(x) x
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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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* Description of the data structures used is in ip_dummynet.h
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* Here you mainly find the following blocks of code:
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* + variable declarations;
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* + heap management functions;
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* + scheduler and dummynet functions;
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* + configuration and initialization.
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*
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* NOTA BENE: critical sections are protected by splimp()/splx()
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* pairs. One would think that splnet() is enough as for most of
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* the netinet code, but it is not so because when used with
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* bridging, dummynet is invoked at splimp().
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*
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* Most important Changes:
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*
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* 010124: Fixed WF2Q behaviour
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* 010122: Fixed spl protection.
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* 000601: WF2Q support
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* 000106: large rewrite, use heaps to handle very many pipes.
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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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*/
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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/module.h>
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#include <sys/socket.h>
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#include <sys/socketvar.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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#include <netinet/ip_var.h>
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#include "opt_bdg.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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/*
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* We keep a private variable for the simulation time, but we could
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* probably use an existing one ("softticks" in sys/kern/kern_timer.c)
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*/
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static dn_key curr_time = 0 ; /* current simulation time */
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static int dn_hash_size = 64 ; /* default hash size */
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/* statistics on number of queue searches and search steps */
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static int searches, search_steps ;
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static int pipe_expire = 1 ; /* expire queue if empty */
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static int dn_max_ratio = 16 ; /* max queues/buckets ratio */
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static int red_lookup_depth = 256; /* RED - default lookup table depth */
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static int red_avg_pkt_size = 512; /* RED - default medium packet size */
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static int red_max_pkt_size = 1500; /* RED - default max packet size */
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/*
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* Three heaps contain queues and pipes that the scheduler handles:
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*
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* ready_heap contains all dn_flow_queue related to fixed-rate pipes.
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*
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* wfq_ready_heap contains the pipes associated with WF2Q flows
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*
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* extract_heap contains pipes associated with delay lines.
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*
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*/
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static struct dn_heap ready_heap, extract_heap, wfq_ready_heap ;
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static int heap_init(struct dn_heap *h, int size) ;
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static int heap_insert (struct dn_heap *h, dn_key key1, void *p);
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static void heap_extract(struct dn_heap *h, void *obj);
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static void transmit_event(struct dn_pipe *pipe);
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static void ready_event(struct dn_flow_queue *q);
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static struct dn_pipe *all_pipes = NULL ; /* list of all pipes */
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static struct dn_flow_set *all_flow_sets = NULL ;/* list of all flow_sets */
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#ifdef SYSCTL_NODE
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SYSCTL_NODE(_net_inet_ip, OID_AUTO, dummynet,
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CTLFLAG_RW, 0, "Dummynet");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, hash_size,
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CTLFLAG_RW, &dn_hash_size, 0, "Default hash table size");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, curr_time,
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CTLFLAG_RD, &curr_time, 0, "Current tick");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, ready_heap,
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CTLFLAG_RD, &ready_heap.size, 0, "Size of ready heap");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, extract_heap,
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CTLFLAG_RD, &extract_heap.size, 0, "Size of extract heap");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, searches,
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CTLFLAG_RD, &searches, 0, "Number of queue searches");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, search_steps,
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CTLFLAG_RD, &search_steps, 0, "Number of queue search steps");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, expire,
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CTLFLAG_RW, &pipe_expire, 0, "Expire queue if empty");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, max_chain_len,
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CTLFLAG_RW, &dn_max_ratio, 0,
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"Max ratio between dynamic queues and buckets");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, red_lookup_depth,
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CTLFLAG_RD, &red_lookup_depth, 0, "Depth of RED lookup table");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, red_avg_pkt_size,
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CTLFLAG_RD, &red_avg_pkt_size, 0, "RED Medium packet size");
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, red_max_pkt_size,
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CTLFLAG_RD, &red_max_pkt_size, 0, "RED Max packet size");
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#endif
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static int config_pipe(struct dn_pipe *p);
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static int ip_dn_ctl(struct sockopt *sopt);
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static void rt_unref(struct rtentry *);
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static void dummynet(void *);
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static void dummynet_flush(void);
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void dummynet_drain(void);
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int if_tx_rdy(struct ifnet *ifp);
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/*
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* ip_fw_chain is used when deleting a pipe, because ipfw 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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static void
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rt_unref(struct rtentry *rt)
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{
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if (rt == NULL)
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return ;
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if (rt->rt_refcnt <= 0)
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printf("-- warning, refcnt now %ld, decreasing\n", rt->rt_refcnt);
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RTFREE(rt);
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}
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/*
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* Heap management functions.
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*
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* In the heap, first node is element 0. Children of i are 2i+1 and 2i+2.
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* Some macros help finding parent/children so we can optimize them.
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*
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* heap_init() is called to expand the heap when needed.
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* Increment size in blocks of 16 entries.
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* XXX failure to allocate a new element is a pretty bad failure
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* as we basically stall a whole queue forever!!
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* Returns 1 on error, 0 on success
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*/
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#define HEAP_FATHER(x) ( ( (x) - 1 ) / 2 )
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#define HEAP_LEFT(x) ( 2*(x) + 1 )
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#define HEAP_IS_LEFT(x) ( (x) & 1 )
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#define HEAP_RIGHT(x) ( 2*(x) + 2 )
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#define HEAP_SWAP(a, b, buffer) { buffer = a ; a = b ; b = buffer ; }
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#define HEAP_INCREMENT 15
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static int
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heap_init(struct dn_heap *h, int new_size)
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{
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struct dn_heap_entry *p;
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if (h->size >= new_size ) {
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printf("heap_init, Bogus call, have %d want %d\n",
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h->size, new_size);
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return 0 ;
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}
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new_size = (new_size + HEAP_INCREMENT ) & ~HEAP_INCREMENT ;
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p = malloc(new_size * sizeof(*p), M_IPFW, M_DONTWAIT );
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if (p == NULL) {
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printf(" heap_init, resize %d failed\n", new_size );
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return 1 ; /* error */
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}
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if (h->size > 0) {
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bcopy(h->p, p, h->size * sizeof(*p) );
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free(h->p, M_IPFW);
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}
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h->p = p ;
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h->size = new_size ;
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return 0 ;
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}
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/*
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* Insert element in heap. Normally, p != NULL, we insert p in
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* a new position and bubble up. If p == NULL, then the element is
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* already in place, and key is the position where to start the
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* bubble-up.
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* Returns 1 on failure (cannot allocate new heap entry)
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*
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* If offset > 0 the position (index, int) of the element in the heap is
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* also stored in the element itself at the given offset in bytes.
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*/
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#define SET_OFFSET(heap, node) \
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if (heap->offset > 0) \
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*((int *)((char *)(heap->p[node].object) + heap->offset)) = node ;
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/*
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* RESET_OFFSET is used for sanity checks. It sets offset to an invalid value.
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*/
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#define RESET_OFFSET(heap, node) \
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if (heap->offset > 0) \
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*((int *)((char *)(heap->p[node].object) + heap->offset)) = -1 ;
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static int
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heap_insert(struct dn_heap *h, dn_key key1, void *p)
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{
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int son = h->elements ;
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if (p == NULL) /* data already there, set starting point */
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son = key1 ;
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else { /* insert new element at the end, possibly resize */
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son = h->elements ;
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if (son == h->size) /* need resize... */
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if (heap_init(h, h->elements+1) )
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return 1 ; /* failure... */
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h->p[son].object = p ;
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h->p[son].key = key1 ;
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h->elements++ ;
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}
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while (son > 0) { /* bubble up */
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int father = HEAP_FATHER(son) ;
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struct dn_heap_entry tmp ;
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if (DN_KEY_LT( h->p[father].key, h->p[son].key ) )
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break ; /* found right position */
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/* son smaller than father, swap and repeat */
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HEAP_SWAP(h->p[son], h->p[father], tmp) ;
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SET_OFFSET(h, son);
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son = father ;
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}
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SET_OFFSET(h, son);
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return 0 ;
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}
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/*
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* remove top element from heap, or obj if obj != NULL
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*/
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static void
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heap_extract(struct dn_heap *h, void *obj)
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{
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int child, father, max = h->elements - 1 ;
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if (max < 0) {
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printf("warning, extract from empty heap 0x%p\n", h);
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return ;
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}
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father = 0 ; /* default: move up smallest child */
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if (obj != NULL) { /* extract specific element, index is at offset */
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if (h->offset <= 0)
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panic("*** heap_extract from middle not supported on this heap!!!\n");
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father = *((int *)((char *)obj + h->offset)) ;
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if (father < 0 || father >= h->elements) {
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printf("dummynet: heap_extract, father %d out of bound 0..%d\n",
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father, h->elements);
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panic("heap_extract");
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}
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}
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RESET_OFFSET(h, father);
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child = HEAP_LEFT(father) ; /* left child */
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while (child <= max) { /* valid entry */
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if (child != max && DN_KEY_LT(h->p[child+1].key, h->p[child].key) )
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child = child+1 ; /* take right child, otherwise left */
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h->p[father] = h->p[child] ;
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SET_OFFSET(h, father);
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father = child ;
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child = HEAP_LEFT(child) ; /* left child for next loop */
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}
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h->elements-- ;
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if (father != max) {
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/*
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* Fill hole with last entry and bubble up, reusing the insert code
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*/
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h->p[father] = h->p[max] ;
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heap_insert(h, father, NULL); /* this one cannot fail */
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}
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}
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#if 0
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/*
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* change object position and update references
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* XXX this one is never used!
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*/
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static void
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heap_move(struct dn_heap *h, dn_key new_key, void *object)
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{
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int temp;
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int i ;
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int max = h->elements-1 ;
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struct dn_heap_entry buf ;
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if (h->offset <= 0)
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panic("cannot move items on this heap");
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i = *((int *)((char *)object + h->offset));
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if (DN_KEY_LT(new_key, h->p[i].key) ) { /* must move up */
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h->p[i].key = new_key ;
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for (; i>0 && DN_KEY_LT(new_key, h->p[(temp = HEAP_FATHER(i))].key) ;
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i = temp ) { /* bubble up */
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HEAP_SWAP(h->p[i], h->p[temp], buf) ;
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SET_OFFSET(h, i);
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}
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} else { /* must move down */
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h->p[i].key = new_key ;
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while ( (temp = HEAP_LEFT(i)) <= max ) { /* found left child */
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if ((temp != max) && DN_KEY_GT(h->p[temp].key, h->p[temp+1].key))
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temp++ ; /* select child with min key */
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if (DN_KEY_GT(new_key, h->p[temp].key)) { /* go down */
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HEAP_SWAP(h->p[i], h->p[temp], buf) ;
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SET_OFFSET(h, i);
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} else
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break ;
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i = temp ;
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}
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}
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SET_OFFSET(h, i);
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}
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#endif /* heap_move, unused */
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/*
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* heapify() will reorganize data inside an array to maintain the
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* heap property. It is needed when we delete a bunch of entries.
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*/
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static void
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heapify(struct dn_heap *h)
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{
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int i ;
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for (i = 0 ; i < h->elements ; i++ )
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heap_insert(h, i , NULL) ;
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}
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/*
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* cleanup the heap and free data structure
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*/
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static void
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heap_free(struct dn_heap *h)
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{
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if (h->size >0 )
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free(h->p, M_IPFW);
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bzero(h, sizeof(*h) );
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}
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/*
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* --- end of heap management functions ---
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*/
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/*
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* Scheduler functions:
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*
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* transmit_event() is called when the delay-line needs to enter
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* the scheduler, either because of existing pkts getting ready,
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* or new packets entering the queue. The event handled is the delivery
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* time of the packet.
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*
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* ready_event() does something similar with fixed-rate queues, and the
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* event handled is the finish time of the head pkt.
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*
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* wfq_ready_event() does something similar with WF2Q queues, and the
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* event handled is the start time of the head pkt.
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*
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* In all cases, we make sure that the data structures are consistent
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* before passing pkts out, because this might trigger recursive
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* invocations of the procedures.
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*/
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static void
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transmit_event(struct dn_pipe *pipe)
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{
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struct dn_pkt *pkt ;
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while ( (pkt = pipe->head) && DN_KEY_LEQ(pkt->output_time, curr_time) ) {
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/*
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* first unlink, then call procedures, since ip_input() can invoke
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* ip_output() and viceversa, thus causing nested calls
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*/
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pipe->head = DN_NEXT(pkt) ;
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/*
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* The actual mbuf is preceded by a struct dn_pkt, resembling an mbuf
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* (NOT A REAL one, just a small block of malloc'ed memory) with
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* m_type = MT_DUMMYNET
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* m_next = actual mbuf to be processed by ip_input/output
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* m_data = the matching rule
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* and some other fields.
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* The block IS FREED HERE because it contains parameters passed
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* to the called routine.
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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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(void)ip_output((struct mbuf *)pkt, NULL, NULL, 0, NULL);
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rt_unref (pkt->ro.ro_rt) ;
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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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struct mbuf *m = (struct mbuf *)pkt;
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struct ether_header *eh;
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if (pkt->dn_m->m_len < ETHER_HDR_LEN
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&& (pkt->dn_m = m_pullup(pkt->dn_m, ETHER_HDR_LEN)) == NULL) {
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printf("dummynet/bridge: pullup fail, dropping pkt\n");
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break;
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}
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/*
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* same as ether_input, make eh be a pointer into the mbuf
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*/
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eh = mtod(pkt->dn_m, struct ether_header *);
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m_adj(pkt->dn_m, ETHER_HDR_LEN);
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/*
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* bdg_forward() wants a pointer to the pseudo-mbuf-header, but
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* on return it will supply the pointer to the actual packet
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* (originally pkt->dn_m, but could be something else now) if
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* it has not consumed it.
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*/
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m = bdg_forward(&m, eh, pkt->ifp);
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if (m)
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m_freem(m);
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}
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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);
|
|
m_freem(pkt->dn_m);
|
|
break ;
|
|
}
|
|
FREE(pkt, M_IPFW);
|
|
}
|
|
/* if there are leftover packets, put into the heap for next event */
|
|
if ( (pkt = pipe->head) )
|
|
heap_insert(&extract_heap, pkt->output_time, pipe ) ;
|
|
/* XXX should check errors on heap_insert, by draining the
|
|
* whole pipe p and hoping in the future we are more successful
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* the following macro computes how many ticks we have to wait
|
|
* before being able to transmit a packet. The credit is taken from
|
|
* either a pipe (WF2Q) or a flow_queue (per-flow queueing)
|
|
*/
|
|
#define SET_TICKS(pkt, q, p) \
|
|
(pkt->dn_m->m_pkthdr.len*8*hz - (q)->numbytes + p->bandwidth - 1 ) / \
|
|
p->bandwidth ;
|
|
|
|
/*
|
|
* extract pkt from queue, compute output time (could be now)
|
|
* and put into delay line (p_queue)
|
|
*/
|
|
static void
|
|
move_pkt(struct dn_pkt *pkt, struct dn_flow_queue *q,
|
|
struct dn_pipe *p, int len)
|
|
{
|
|
q->head = DN_NEXT(pkt) ;
|
|
q->len-- ;
|
|
q->len_bytes -= len ;
|
|
|
|
pkt->output_time = curr_time + p->delay ;
|
|
|
|
if (p->head == NULL)
|
|
p->head = pkt;
|
|
else
|
|
DN_NEXT(p->tail) = pkt;
|
|
p->tail = pkt;
|
|
DN_NEXT(p->tail) = NULL;
|
|
}
|
|
|
|
/*
|
|
* ready_event() is invoked every time the queue must enter the
|
|
* scheduler, either because the first packet arrives, or because
|
|
* a previously scheduled event fired.
|
|
* On invokation, drain as many pkts as possible (could be 0) and then
|
|
* if there are leftover packets reinsert the pkt in the scheduler.
|
|
*/
|
|
static void
|
|
ready_event(struct dn_flow_queue *q)
|
|
{
|
|
struct dn_pkt *pkt;
|
|
struct dn_pipe *p = q->fs->pipe ;
|
|
int p_was_empty ;
|
|
|
|
if (p == NULL) {
|
|
printf("ready_event- pipe is gone\n");
|
|
return ;
|
|
}
|
|
p_was_empty = (p->head == NULL) ;
|
|
|
|
/*
|
|
* schedule fixed-rate queues linked to this pipe:
|
|
* Account for the bw accumulated since last scheduling, then
|
|
* drain as many pkts as allowed by q->numbytes and move to
|
|
* the delay line (in p) computing output time.
|
|
* bandwidth==0 (no limit) means we can drain the whole queue,
|
|
* setting len_scaled = 0 does the job.
|
|
*/
|
|
q->numbytes += ( curr_time - q->sched_time ) * p->bandwidth;
|
|
while ( (pkt = q->head) != NULL ) {
|
|
int len = pkt->dn_m->m_pkthdr.len;
|
|
int len_scaled = p->bandwidth ? len*8*hz : 0 ;
|
|
if (len_scaled > q->numbytes )
|
|
break ;
|
|
q->numbytes -= len_scaled ;
|
|
move_pkt(pkt, q, p, len);
|
|
}
|
|
/*
|
|
* If we have more packets queued, schedule next ready event
|
|
* (can only occur when bandwidth != 0, otherwise we would have
|
|
* flushed the whole queue in the previous loop).
|
|
* To this purpose we record the current time and compute how many
|
|
* ticks to go for the finish time of the packet.
|
|
*/
|
|
if ( (pkt = q->head) != NULL ) { /* this implies bandwidth != 0 */
|
|
dn_key t = SET_TICKS(pkt, q, p); /* ticks i have to wait */
|
|
q->sched_time = curr_time ;
|
|
heap_insert(&ready_heap, curr_time + t, (void *)q );
|
|
/* XXX should check errors on heap_insert, and drain the whole
|
|
* queue on error hoping next time we are luckier.
|
|
*/
|
|
} else /* RED needs to know when the queue becomes empty */
|
|
q->q_time = curr_time;
|
|
/*
|
|
* If the delay line was empty call transmit_event(p) now.
|
|
* Otherwise, the scheduler will take care of it.
|
|
*/
|
|
if (p_was_empty)
|
|
transmit_event(p);
|
|
}
|
|
|
|
/*
|
|
* Called when we can transmit packets on WF2Q queues. Take pkts out of
|
|
* the queues at their start time, and enqueue into the delay line.
|
|
* Packets are drained until p->numbytes < 0. As long as
|
|
* len_scaled >= p->numbytes, the packet goes into the delay line
|
|
* with a deadline p->delay. For the last packet, if p->numbytes<0,
|
|
* there is an additional delay.
|
|
*/
|
|
static void
|
|
ready_event_wfq(struct dn_pipe *p)
|
|
{
|
|
int p_was_empty = (p->head == NULL) ;
|
|
struct dn_heap *sch = &(p->scheduler_heap);
|
|
struct dn_heap *neh = &(p->not_eligible_heap) ;
|
|
|
|
if (p->if_name[0] == 0) /* tx clock is simulated */
|
|
p->numbytes += ( curr_time - p->sched_time ) * p->bandwidth;
|
|
else { /* tx clock is for real, the ifq must be empty or this is a NOP */
|
|
if (p->ifp && p->ifp->if_snd.ifq_head != NULL)
|
|
return ;
|
|
else {
|
|
DEB(printf("pipe %d ready from %s --\n",
|
|
p->pipe_nr, p->if_name);)
|
|
}
|
|
}
|
|
|
|
/*
|
|
* While we have backlogged traffic AND credit, we need to do
|
|
* something on the queue.
|
|
*/
|
|
while ( p->numbytes >=0 && (sch->elements>0 || neh->elements >0) ) {
|
|
if (sch->elements > 0) { /* have some eligible pkts to send out */
|
|
struct dn_flow_queue *q = sch->p[0].object ;
|
|
struct dn_pkt *pkt = q->head;
|
|
struct dn_flow_set *fs = q->fs;
|
|
u_int64_t len = pkt->dn_m->m_pkthdr.len;
|
|
int len_scaled = p->bandwidth ? len*8*hz : 0 ;
|
|
|
|
heap_extract(sch, NULL); /* remove queue from heap */
|
|
p->numbytes -= len_scaled ;
|
|
move_pkt(pkt, q, p, len);
|
|
|
|
p->V += (len<<MY_M) / p->sum ; /* update V */
|
|
q->S = q->F ; /* update start time */
|
|
if (q->len == 0) { /* Flow not backlogged any more */
|
|
fs->backlogged-- ;
|
|
heap_insert(&(p->idle_heap), q->F, q);
|
|
} else { /* still backlogged */
|
|
/*
|
|
* update F and position in backlogged queue, then
|
|
* put flow in not_eligible_heap (we will fix this later).
|
|
*/
|
|
len = (q->head)->dn_m->m_pkthdr.len;
|
|
q->F += (len<<MY_M)/(u_int64_t) fs->weight ;
|
|
if (DN_KEY_LEQ(q->S, p->V))
|
|
heap_insert(neh, q->S, q);
|
|
else
|
|
heap_insert(sch, q->F, q);
|
|
}
|
|
}
|
|
/*
|
|
* now compute V = max(V, min(S_i)). Remember that all elements in sch
|
|
* have by definition S_i <= V so if sch is not empty, V is surely
|
|
* the max and we must not update it. Conversely, if sch is empty
|
|
* we only need to look at neh.
|
|
*/
|
|
if (sch->elements == 0 && neh->elements > 0)
|
|
p->V = MAX64 ( p->V, neh->p[0].key );
|
|
/* move from neh to sch any packets that have become eligible */
|
|
while (neh->elements > 0 && DN_KEY_LEQ(neh->p[0].key, p->V) ) {
|
|
struct dn_flow_queue *q = neh->p[0].object ;
|
|
heap_extract(neh, NULL);
|
|
heap_insert(sch, q->F, q);
|
|
}
|
|
|
|
if (p->if_name[0] != '\0') {/* tx clock is from a real thing */
|
|
p->numbytes = -1 ; /* mark not ready for I/O */
|
|
break ;
|
|
}
|
|
}
|
|
if (sch->elements == 0 && neh->elements == 0 && p->numbytes >= 0
|
|
&& p->idle_heap.elements > 0) {
|
|
/*
|
|
* no traffic and no events scheduled. We can get rid of idle-heap.
|
|
*/
|
|
int i ;
|
|
|
|
for (i = 0 ; i < p->idle_heap.elements ; i++) {
|
|
struct dn_flow_queue *q = p->idle_heap.p[i].object ;
|
|
|
|
q->F = 0 ;
|
|
q->S = q->F + 1 ;
|
|
}
|
|
p->sum = 0 ;
|
|
p->V = 0 ;
|
|
p->idle_heap.elements = 0 ;
|
|
}
|
|
/*
|
|
* If we are getting clocks from dummynet (not a real interface) and
|
|
* If we are under credit, schedule the next ready event.
|
|
* Also fix the delivery time of the last packet.
|
|
*/
|
|
if (p->if_name[0]==0 && p->numbytes < 0) { /* this implies bandwidth >0 */
|
|
dn_key t=0 ; /* number of ticks i have to wait */
|
|
|
|
if (p->bandwidth > 0)
|
|
t = ( p->bandwidth -1 - p->numbytes) / p->bandwidth ;
|
|
p->tail->output_time += t ;
|
|
p->sched_time = curr_time ;
|
|
heap_insert(&wfq_ready_heap, curr_time + t, (void *)p);
|
|
/* XXX should check errors on heap_insert, and drain the whole
|
|
* queue on error hoping next time we are luckier.
|
|
*/
|
|
}
|
|
/*
|
|
* If the delay line was empty call transmit_event(p) now.
|
|
* Otherwise, the scheduler will take care of it.
|
|
*/
|
|
if (p_was_empty)
|
|
transmit_event(p);
|
|
}
|
|
|
|
/*
|
|
* This is called once per tick, or HZ times per second. It is used to
|
|
* increment the current tick counter and schedule expired events.
|
|
*/
|
|
static void
|
|
dummynet(void * __unused unused)
|
|
{
|
|
void *p ; /* generic parameter to handler */
|
|
struct dn_heap *h ;
|
|
int s ;
|
|
struct dn_heap *heaps[3];
|
|
int i;
|
|
struct dn_pipe *pe ;
|
|
|
|
heaps[0] = &ready_heap ; /* fixed-rate queues */
|
|
heaps[1] = &wfq_ready_heap ; /* wfq queues */
|
|
heaps[2] = &extract_heap ; /* delay line */
|
|
s = splimp(); /* see note on top, splnet() is not enough */
|
|
curr_time++ ;
|
|
for (i=0; i < 3 ; i++) {
|
|
h = heaps[i];
|
|
while (h->elements > 0 && DN_KEY_LEQ(h->p[0].key, curr_time) ) {
|
|
DDB(if (h->p[0].key > curr_time)
|
|
printf("-- dummynet: warning, heap %d is %d ticks late\n",
|
|
i, (int)(curr_time - h->p[0].key));)
|
|
p = h->p[0].object ; /* store a copy before heap_extract */
|
|
heap_extract(h, NULL); /* need to extract before processing */
|
|
if (i == 0)
|
|
ready_event(p) ;
|
|
else if (i == 1) {
|
|
struct dn_pipe *pipe = p;
|
|
if (pipe->if_name[0] != '\0')
|
|
printf("*** bad ready_event_wfq for pipe %s\n",
|
|
pipe->if_name);
|
|
else
|
|
ready_event_wfq(p) ;
|
|
} else
|
|
transmit_event(p);
|
|
}
|
|
}
|
|
/* sweep pipes trying to expire idle flow_queues */
|
|
for (pe = all_pipes; pe ; pe = pe->next )
|
|
if (pe->idle_heap.elements > 0 &&
|
|
DN_KEY_LT(pe->idle_heap.p[0].key, pe->V) ) {
|
|
struct dn_flow_queue *q = pe->idle_heap.p[0].object ;
|
|
|
|
heap_extract(&(pe->idle_heap), NULL);
|
|
q->S = q->F + 1 ; /* mark timestamp as invalid */
|
|
pe->sum -= q->fs->weight ;
|
|
}
|
|
splx(s);
|
|
timeout(dummynet, NULL, 1);
|
|
}
|
|
|
|
/*
|
|
* called by an interface when tx_rdy occurs.
|
|
*/
|
|
int
|
|
if_tx_rdy(struct ifnet *ifp)
|
|
{
|
|
struct dn_pipe *p;
|
|
|
|
for (p = all_pipes; p ; p = p->next )
|
|
if (p->ifp == ifp)
|
|
break ;
|
|
if (p == NULL) {
|
|
char buf[32];
|
|
sprintf(buf, "%s%d",ifp->if_name, ifp->if_unit);
|
|
for (p = all_pipes; p ; p = p->next )
|
|
if (!strcmp(p->if_name, buf) ) {
|
|
p->ifp = ifp ;
|
|
DEB(printf("++ tx rdy from %s (now found)\n", buf);)
|
|
break ;
|
|
}
|
|
}
|
|
if (p != NULL) {
|
|
DEB(printf("++ tx rdy from %s%d - qlen %d\n", ifp->if_name,
|
|
ifp->if_unit, ifp->if_snd.ifq_len);)
|
|
p->numbytes = 0 ; /* mark ready for I/O */
|
|
ready_event_wfq(p);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Unconditionally expire empty queues in case of shortage.
|
|
* Returns the number of queues freed.
|
|
*/
|
|
static int
|
|
expire_queues(struct dn_flow_set *fs)
|
|
{
|
|
struct dn_flow_queue *q, *prev ;
|
|
int i, initial_elements = fs->rq_elements ;
|
|
|
|
if (fs->last_expired == time_second)
|
|
return 0 ;
|
|
fs->last_expired = time_second ;
|
|
for (i = 0 ; i <= fs->rq_size ; i++) /* last one is overflow */
|
|
for (prev=NULL, q = fs->rq[i] ; q != NULL ; )
|
|
if (q->head != NULL || q->S != q->F+1) {
|
|
prev = q ;
|
|
q = q->next ;
|
|
} else { /* entry is idle, expire it */
|
|
struct dn_flow_queue *old_q = q ;
|
|
|
|
if (prev != NULL)
|
|
prev->next = q = q->next ;
|
|
else
|
|
fs->rq[i] = q = q->next ;
|
|
fs->rq_elements-- ;
|
|
free(old_q, M_IPFW);
|
|
}
|
|
return initial_elements - fs->rq_elements ;
|
|
}
|
|
|
|
/*
|
|
* If room, create a new queue and put at head of slot i;
|
|
* otherwise, create or use the default queue.
|
|
*/
|
|
static struct dn_flow_queue *
|
|
create_queue(struct dn_flow_set *fs, int i)
|
|
{
|
|
struct dn_flow_queue *q ;
|
|
|
|
if (fs->rq_elements > fs->rq_size * dn_max_ratio &&
|
|
expire_queues(fs) == 0) {
|
|
/*
|
|
* No way to get room, use or create overflow queue.
|
|
*/
|
|
i = fs->rq_size ;
|
|
if ( fs->rq[i] != NULL )
|
|
return fs->rq[i] ;
|
|
}
|
|
q = malloc(sizeof(*q), M_IPFW, M_DONTWAIT | M_ZERO); /* M_ZERO needed */
|
|
if (q == NULL) {
|
|
printf("sorry, cannot allocate queue for new flow\n");
|
|
return NULL ;
|
|
}
|
|
q->fs = fs ;
|
|
q->hash_slot = i ;
|
|
q->next = fs->rq[i] ;
|
|
q->S = q->F + 1; /* hack - mark timestamp as invalid */
|
|
fs->rq[i] = q ;
|
|
fs->rq_elements++ ;
|
|
return q ;
|
|
}
|
|
|
|
/*
|
|
* Given a flow_set and a pkt in last_pkt, find a matching queue
|
|
* after appropriate masking. The queue is moved to front
|
|
* so that further searches take less time.
|
|
*/
|
|
static struct dn_flow_queue *
|
|
find_queue(struct dn_flow_set *fs)
|
|
{
|
|
int i = 0 ; /* we need i and q for new allocations */
|
|
struct dn_flow_queue *q, *prev;
|
|
|
|
if ( !(fs->flags_fs & DN_HAVE_FLOW_MASK) )
|
|
q = fs->rq[0] ;
|
|
else {
|
|
/* first, do the masking */
|
|
last_pkt.dst_ip &= fs->flow_mask.dst_ip ;
|
|
last_pkt.src_ip &= fs->flow_mask.src_ip ;
|
|
last_pkt.dst_port &= fs->flow_mask.dst_port ;
|
|
last_pkt.src_port &= fs->flow_mask.src_port ;
|
|
last_pkt.proto &= fs->flow_mask.proto ;
|
|
last_pkt.flags = 0 ; /* we don't care about this one */
|
|
/* then, hash function */
|
|
i = ( (last_pkt.dst_ip) & 0xffff ) ^
|
|
( (last_pkt.dst_ip >> 15) & 0xffff ) ^
|
|
( (last_pkt.src_ip << 1) & 0xffff ) ^
|
|
( (last_pkt.src_ip >> 16 ) & 0xffff ) ^
|
|
(last_pkt.dst_port << 1) ^ (last_pkt.src_port) ^
|
|
(last_pkt.proto );
|
|
i = i % fs->rq_size ;
|
|
/* finally, scan the current list for a match */
|
|
searches++ ;
|
|
for (prev=NULL, q = fs->rq[i] ; q ; ) {
|
|
search_steps++;
|
|
if (bcmp(&last_pkt, &(q->id), sizeof(q->id) ) == 0)
|
|
break ; /* found */
|
|
else if (pipe_expire && q->head == NULL && q->S == q->F+1 ) {
|
|
/* entry is idle and not in any heap, expire it */
|
|
struct dn_flow_queue *old_q = q ;
|
|
|
|
if (prev != NULL)
|
|
prev->next = q = q->next ;
|
|
else
|
|
fs->rq[i] = q = q->next ;
|
|
fs->rq_elements-- ;
|
|
free(old_q, M_IPFW);
|
|
continue ;
|
|
}
|
|
prev = q ;
|
|
q = q->next ;
|
|
}
|
|
if (q && prev != NULL) { /* found and not in front */
|
|
prev->next = q->next ;
|
|
q->next = fs->rq[i] ;
|
|
fs->rq[i] = q ;
|
|
}
|
|
}
|
|
if (q == NULL) { /* no match, need to allocate a new entry */
|
|
q = create_queue(fs, i);
|
|
if (q != NULL)
|
|
q->id = last_pkt ;
|
|
}
|
|
return q ;
|
|
}
|
|
|
|
static int
|
|
red_drops(struct dn_flow_set *fs, struct dn_flow_queue *q, int len)
|
|
{
|
|
/*
|
|
* RED algorithm
|
|
*
|
|
* RED calculates the average queue size (avg) using a low-pass filter
|
|
* with an exponential weighted (w_q) moving average:
|
|
* avg <- (1-w_q) * avg + w_q * q_size
|
|
* where q_size is the queue length (measured in bytes or * packets).
|
|
*
|
|
* If q_size == 0, we compute the idle time for the link, and set
|
|
* avg = (1 - w_q)^(idle/s)
|
|
* where s is the time needed for transmitting a medium-sized packet.
|
|
*
|
|
* Now, if avg < min_th the packet is enqueued.
|
|
* If avg > max_th the packet is dropped. Otherwise, the packet is
|
|
* dropped with probability P function of avg.
|
|
*
|
|
*/
|
|
|
|
int64_t p_b = 0;
|
|
/* queue in bytes or packets ? */
|
|
u_int q_size = (fs->flags_fs & DN_QSIZE_IS_BYTES) ? q->len_bytes : q->len;
|
|
|
|
DEB(printf("\n%d q: %2u ", (int) curr_time, q_size);)
|
|
|
|
/* average queue size estimation */
|
|
if (q_size != 0) {
|
|
/*
|
|
* queue is not empty, avg <- avg + (q_size - avg) * w_q
|
|
*/
|
|
int diff = SCALE(q_size) - q->avg;
|
|
int64_t v = SCALE_MUL((int64_t) diff, (int64_t) fs->w_q);
|
|
|
|
q->avg += (int) v;
|
|
} else {
|
|
/*
|
|
* queue is empty, find for how long the queue has been
|
|
* empty and use a lookup table for computing
|
|
* (1 - * w_q)^(idle_time/s) where s is the time to send a
|
|
* (small) packet.
|
|
* XXX check wraps...
|
|
*/
|
|
if (q->avg) {
|
|
u_int t = (curr_time - q->q_time) / fs->lookup_step;
|
|
|
|
q->avg = (t < fs->lookup_depth) ?
|
|
SCALE_MUL(q->avg, fs->w_q_lookup[t]) : 0;
|
|
}
|
|
}
|
|
DEB(printf("avg: %u ", SCALE_VAL(q->avg));)
|
|
|
|
/* should i drop ? */
|
|
|
|
if (q->avg < fs->min_th) {
|
|
q->count = -1;
|
|
return 0; /* accept packet ; */
|
|
}
|
|
if (q->avg >= fs->max_th) { /* average queue >= max threshold */
|
|
if (fs->flags_fs & DN_IS_GENTLE_RED) {
|
|
/*
|
|
* According to Gentle-RED, if avg is greater than max_th the
|
|
* packet is dropped with a probability
|
|
* p_b = c_3 * avg - c_4
|
|
* where c_3 = (1 - max_p) / max_th, and c_4 = 1 - 2 * max_p
|
|
*/
|
|
p_b = SCALE_MUL((int64_t) fs->c_3, (int64_t) q->avg) - fs->c_4;
|
|
} else {
|
|
q->count = -1;
|
|
printf("- drop");
|
|
return 1 ;
|
|
}
|
|
} else if (q->avg > fs->min_th) {
|
|
/*
|
|
* we compute p_b using the linear dropping function p_b = c_1 *
|
|
* avg - c_2, where c_1 = max_p / (max_th - min_th), and c_2 =
|
|
* max_p * min_th / (max_th - min_th)
|
|
*/
|
|
p_b = SCALE_MUL((int64_t) fs->c_1, (int64_t) q->avg) - fs->c_2;
|
|
}
|
|
if (fs->flags_fs & DN_QSIZE_IS_BYTES)
|
|
p_b = (p_b * len) / fs->max_pkt_size;
|
|
if (++q->count == 0)
|
|
q->random = random() & 0xffff;
|
|
else {
|
|
/*
|
|
* q->count counts packets arrived since last drop, so a greater
|
|
* value of q->count means a greater packet drop probability.
|
|
*/
|
|
if (SCALE_MUL(p_b, SCALE((int64_t) q->count)) > q->random) {
|
|
q->count = 0;
|
|
DEB(printf("- red drop");)
|
|
/* after a drop we calculate a new random value */
|
|
q->random = random() & 0xffff;
|
|
return 1; /* drop */
|
|
}
|
|
}
|
|
/* end of RED algorithm */
|
|
return 0 ; /* accept */
|
|
}
|
|
|
|
static __inline
|
|
struct dn_flow_set *
|
|
locate_flowset(int pipe_nr, struct ip_fw_chain *rule)
|
|
{
|
|
struct dn_flow_set *fs = NULL ;
|
|
|
|
if ( (rule->rule->fw_flg & IP_FW_F_COMMAND) == IP_FW_F_QUEUE )
|
|
for (fs=all_flow_sets; fs && fs->fs_nr != pipe_nr; fs=fs->next)
|
|
;
|
|
else {
|
|
struct dn_pipe *p1;
|
|
for (p1 = all_pipes; p1 && p1->pipe_nr != pipe_nr; p1 = p1->next)
|
|
;
|
|
if (p1 != NULL)
|
|
fs = &(p1->fs) ;
|
|
}
|
|
if (fs != NULL)
|
|
rule->rule->pipe_ptr = fs ; /* record for the future */
|
|
return fs ;
|
|
}
|
|
|
|
/*
|
|
* dummynet hook for packets. Below 'pipe' is a pipe or a queue
|
|
* depending on whether WF2Q or fixed bw is used.
|
|
*/
|
|
int
|
|
dummynet_io(int pipe_nr, int dir, /* pipe_nr can also be a fs_nr */
|
|
struct mbuf *m, struct ifnet *ifp, struct route *ro,
|
|
struct sockaddr_in *dst,
|
|
struct ip_fw_chain *rule, int flags)
|
|
{
|
|
struct dn_pkt *pkt;
|
|
struct dn_flow_set *fs;
|
|
struct dn_pipe *pipe ;
|
|
u_int64_t len = m->m_pkthdr.len ;
|
|
struct dn_flow_queue *q = NULL ;
|
|
int s ;
|
|
|
|
s = splimp();
|
|
|
|
pipe_nr &= 0xffff ;
|
|
|
|
if ( (fs = rule->rule->pipe_ptr) == NULL ) {
|
|
fs = locate_flowset(pipe_nr, rule);
|
|
if (fs == NULL)
|
|
goto dropit ; /* this queue/pipe does not exist! */
|
|
}
|
|
pipe = fs->pipe ;
|
|
if (pipe == NULL) { /* must be a queue, try find a matching pipe */
|
|
for (pipe = all_pipes; pipe && pipe->pipe_nr != fs->parent_nr;
|
|
pipe = pipe->next)
|
|
;
|
|
if (pipe != NULL)
|
|
fs->pipe = pipe ;
|
|
else {
|
|
printf("No pipe %d for queue %d, drop pkt\n",
|
|
fs->parent_nr, fs->fs_nr);
|
|
goto dropit ;
|
|
}
|
|
}
|
|
q = find_queue(fs);
|
|
if ( q == NULL )
|
|
goto dropit ; /* cannot allocate queue */
|
|
/*
|
|
* update statistics, then check reasons to drop pkt
|
|
*/
|
|
q->tot_bytes += len ;
|
|
q->tot_pkts++ ;
|
|
if ( fs->plr && random() < fs->plr )
|
|
goto dropit ; /* random pkt drop */
|
|
if ( fs->flags_fs & DN_QSIZE_IS_BYTES) {
|
|
if (q->len_bytes > fs->qsize)
|
|
goto dropit ; /* queue size overflow */
|
|
} else {
|
|
if (q->len >= fs->qsize)
|
|
goto dropit ; /* queue count overflow */
|
|
}
|
|
if ( fs->flags_fs & DN_IS_RED && red_drops(fs, q, len) )
|
|
goto dropit ;
|
|
|
|
/* XXX expensive to zero, see if we can remove it*/
|
|
pkt = (struct dn_pkt *)malloc(sizeof (*pkt), M_IPFW, M_NOWAIT | M_ZERO);
|
|
if ( pkt == NULL )
|
|
goto dropit ; /* cannot allocate packet header */
|
|
/* ok, i can handle the pkt now... */
|
|
/* build and enqueue packet + parameters */
|
|
pkt->hdr.mh_type = MT_DUMMYNET ;
|
|
(struct ip_fw_chain *)pkt->hdr.mh_data = rule ;
|
|
DN_NEXT(pkt) = NULL;
|
|
pkt->dn_m = m;
|
|
pkt->dn_dir = dir ;
|
|
|
|
pkt->ifp = ifp;
|
|
if (dir == DN_TO_IP_OUT) {
|
|
/*
|
|
* We need to copy *ro because for ICMP pkts (and maybe others)
|
|
* the caller passed a pointer into the stack; dst might also be
|
|
* a pointer into *ro so it needs to be updated.
|
|
*/
|
|
pkt->ro = *ro;
|
|
if (ro->ro_rt)
|
|
ro->ro_rt->rt_refcnt++ ;
|
|
if (dst == (struct sockaddr_in *)&ro->ro_dst) /* dst points into ro */
|
|
dst = (struct sockaddr_in *)&(pkt->ro.ro_dst) ;
|
|
|
|
pkt->dn_dst = dst;
|
|
pkt->flags = flags ;
|
|
}
|
|
if (q->head == NULL)
|
|
q->head = pkt;
|
|
else
|
|
DN_NEXT(q->tail) = pkt;
|
|
q->tail = pkt;
|
|
q->len++;
|
|
q->len_bytes += len ;
|
|
|
|
if ( q->head != pkt ) /* flow was not idle, we are done */
|
|
goto done;
|
|
/*
|
|
* If we reach this point the flow was previously idle, so we need
|
|
* to schedule it. This involves different actions for fixed-rate or
|
|
* WF2Q queues.
|
|
*/
|
|
if ( (rule->rule->fw_flg & IP_FW_F_COMMAND) == IP_FW_F_PIPE ) {
|
|
/*
|
|
* Fixed-rate queue: just insert into the ready_heap.
|
|
*/
|
|
dn_key t = 0 ;
|
|
if (pipe->bandwidth)
|
|
t = SET_TICKS(pkt, q, pipe);
|
|
q->sched_time = curr_time ;
|
|
if (t == 0) /* must process it now */
|
|
ready_event( q );
|
|
else
|
|
heap_insert(&ready_heap, curr_time + t , q );
|
|
} else {
|
|
/*
|
|
* WF2Q. First, compute start time S: if the flow was idle (S=F+1)
|
|
* set S to the virtual time V for the controlling pipe, and update
|
|
* the sum of weights for the pipe; otherwise, remove flow from
|
|
* idle_heap and set S to max(F,V).
|
|
* Second, compute finish time F = S + len/weight.
|
|
* Third, if pipe was idle, update V=max(S, V).
|
|
* Fourth, count one more backlogged flow.
|
|
*/
|
|
if (DN_KEY_GT(q->S, q->F)) { /* means timestamps are invalid */
|
|
q->S = pipe->V ;
|
|
pipe->sum += fs->weight ; /* add weight of new queue */
|
|
} else {
|
|
heap_extract(&(pipe->idle_heap), q);
|
|
q->S = MAX64(q->F, pipe->V ) ;
|
|
}
|
|
q->F = q->S + ( len<<MY_M )/(u_int64_t) fs->weight;
|
|
|
|
if (pipe->not_eligible_heap.elements == 0 &&
|
|
pipe->scheduler_heap.elements == 0)
|
|
pipe->V = MAX64 ( q->S, pipe->V );
|
|
fs->backlogged++ ;
|
|
/*
|
|
* Look at eligibility. A flow is not eligibile if S>V (when
|
|
* this happens, it means that there is some other flow already
|
|
* scheduled for the same pipe, so the scheduler_heap cannot be
|
|
* empty). If the flow is not eligible we just store it in the
|
|
* not_eligible_heap. Otherwise, we store in the scheduler_heap
|
|
* and possibly invoke ready_event_wfq() right now if there is
|
|
* leftover credit.
|
|
* Note that for all flows in scheduler_heap (SCH), S_i <= V,
|
|
* and for all flows in not_eligible_heap (NEH), S_i > V .
|
|
* So when we need to compute max( V, min(S_i) ) forall i in SCH+NEH,
|
|
* we only need to look into NEH.
|
|
*/
|
|
if (DN_KEY_GT(q->S, pipe->V) ) { /* not eligible */
|
|
if (pipe->scheduler_heap.elements == 0)
|
|
printf("++ ouch! not eligible but empty scheduler!\n");
|
|
heap_insert(&(pipe->not_eligible_heap), q->S, q);
|
|
} else {
|
|
heap_insert(&(pipe->scheduler_heap), q->F, q);
|
|
if (pipe->numbytes >= 0) { /* pipe is idle */
|
|
if (pipe->scheduler_heap.elements != 1)
|
|
printf("*** OUCH! pipe should have been idle!\n");
|
|
DEB(printf("Waking up pipe %d at %d\n",
|
|
pipe->pipe_nr, (int)(q->F >> MY_M)); )
|
|
pipe->sched_time = curr_time ;
|
|
ready_event_wfq(pipe);
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
splx(s);
|
|
return 0;
|
|
|
|
dropit:
|
|
splx(s);
|
|
if (q)
|
|
q->drops++ ;
|
|
m_freem(m);
|
|
return ENOBUFS ;
|
|
}
|
|
|
|
/*
|
|
* Below, the rt_unref is only needed when (pkt->dn_dir == DN_TO_IP_OUT)
|
|
* Doing this would probably save us the initial bzero of dn_pkt
|
|
*/
|
|
#define DN_FREE_PKT(pkt) { \
|
|
struct dn_pkt *n = pkt ; \
|
|
rt_unref ( n->ro.ro_rt ) ; \
|
|
m_freem(n->dn_m); \
|
|
pkt = DN_NEXT(n) ; \
|
|
free(n, M_IPFW) ; }
|
|
|
|
/*
|
|
* Dispose all packets and flow_queues on a flow_set.
|
|
* If all=1, also remove red lookup table and other storage,
|
|
* including the descriptor itself.
|
|
* For the one in dn_pipe MUST also cleanup ready_heap...
|
|
*/
|
|
static void
|
|
purge_flow_set(struct dn_flow_set *fs, int all)
|
|
{
|
|
struct dn_pkt *pkt ;
|
|
struct dn_flow_queue *q, *qn ;
|
|
int i ;
|
|
|
|
for (i = 0 ; i <= fs->rq_size ; i++ ) {
|
|
for (q = fs->rq[i] ; q ; q = qn ) {
|
|
for (pkt = q->head ; pkt ; )
|
|
DN_FREE_PKT(pkt) ;
|
|
qn = q->next ;
|
|
free(q, M_IPFW);
|
|
}
|
|
fs->rq[i] = NULL ;
|
|
}
|
|
fs->rq_elements = 0 ;
|
|
if (all) {
|
|
/* RED - free lookup table */
|
|
if (fs->w_q_lookup)
|
|
free(fs->w_q_lookup, M_IPFW);
|
|
if (fs->rq)
|
|
free(fs->rq, M_IPFW);
|
|
/* if this fs is not part of a pipe, free it */
|
|
if (fs->pipe && fs != &(fs->pipe->fs) )
|
|
free(fs, M_IPFW);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Dispose all packets queued on a pipe (not a flow_set).
|
|
* Also free all resources associated to a pipe, which is about
|
|
* to be deleted.
|
|
*/
|
|
static void
|
|
purge_pipe(struct dn_pipe *pipe)
|
|
{
|
|
struct dn_pkt *pkt ;
|
|
|
|
purge_flow_set( &(pipe->fs), 1 );
|
|
|
|
for (pkt = pipe->head ; pkt ; )
|
|
DN_FREE_PKT(pkt) ;
|
|
|
|
heap_free( &(pipe->scheduler_heap) );
|
|
heap_free( &(pipe->not_eligible_heap) );
|
|
heap_free( &(pipe->idle_heap) );
|
|
}
|
|
|
|
/*
|
|
* Delete all pipes and heaps returning memory. Must also
|
|
* remove references from all ipfw rules to all pipes.
|
|
*/
|
|
static void
|
|
dummynet_flush()
|
|
{
|
|
struct dn_pipe *curr_p, *p ;
|
|
struct ip_fw_chain *chain ;
|
|
struct dn_flow_set *fs, *curr_fs;
|
|
int s ;
|
|
|
|
s = splimp() ;
|
|
|
|
/* remove all references to pipes ...*/
|
|
for (chain= ip_fw_chain.lh_first ; chain; chain = chain->chain.le_next)
|
|
chain->rule->pipe_ptr = NULL ;
|
|
/* prevent future matches... */
|
|
p = all_pipes ;
|
|
all_pipes = NULL ;
|
|
fs = all_flow_sets ;
|
|
all_flow_sets = NULL ;
|
|
/* and free heaps so we don't have unwanted events */
|
|
heap_free(&ready_heap);
|
|
heap_free(&wfq_ready_heap);
|
|
heap_free(&extract_heap);
|
|
splx(s) ;
|
|
/*
|
|
* Now purge all queued pkts and delete all pipes
|
|
*/
|
|
/* scan and purge all flow_sets. */
|
|
for ( ; fs ; ) {
|
|
curr_fs = fs ;
|
|
fs = fs->next ;
|
|
purge_flow_set(curr_fs, 1);
|
|
}
|
|
for ( ; p ; ) {
|
|
purge_pipe(p);
|
|
curr_p = p ;
|
|
p = p->next ;
|
|
free(curr_p, M_IPFW);
|
|
}
|
|
}
|
|
|
|
|
|
extern struct ip_fw_chain *ip_fw_default_rule ;
|
|
static void
|
|
dn_rule_delete_fs(struct dn_flow_set *fs, void *r)
|
|
{
|
|
int i ;
|
|
struct dn_flow_queue *q ;
|
|
struct dn_pkt *pkt ;
|
|
|
|
for (i = 0 ; i <= fs->rq_size ; i++) /* last one is ovflow */
|
|
for (q = fs->rq[i] ; q ; q = q->next )
|
|
for (pkt = q->head ; pkt ; pkt = DN_NEXT(pkt) )
|
|
if (pkt->hdr.mh_data == r)
|
|
pkt->hdr.mh_data = (void *)ip_fw_default_rule ;
|
|
}
|
|
/*
|
|
* when a firewall rule is deleted, scan all queues and remove the flow-id
|
|
* from packets matching this rule.
|
|
*/
|
|
void
|
|
dn_rule_delete(void *r)
|
|
{
|
|
struct dn_pipe *p ;
|
|
struct dn_pkt *pkt ;
|
|
struct dn_flow_set *fs ;
|
|
|
|
/*
|
|
* If the rule references a queue (dn_flow_set), then scan
|
|
* the flow set, otherwise scan pipes. Should do either, but doing
|
|
* both does not harm.
|
|
*/
|
|
for ( fs = all_flow_sets ; fs ; fs = fs->next )
|
|
dn_rule_delete_fs(fs, r);
|
|
for ( p = all_pipes ; p ; p = p->next ) {
|
|
fs = &(p->fs) ;
|
|
dn_rule_delete_fs(fs, r);
|
|
for (pkt = p->head ; pkt ; pkt = DN_NEXT(pkt) )
|
|
if (pkt->hdr.mh_data == r)
|
|
pkt->hdr.mh_data = (void *)ip_fw_default_rule ;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* setup RED parameters
|
|
*/
|
|
static int
|
|
config_red(struct dn_flow_set *p, struct dn_flow_set * x)
|
|
{
|
|
int i;
|
|
|
|
x->w_q = p->w_q;
|
|
x->min_th = SCALE(p->min_th);
|
|
x->max_th = SCALE(p->max_th);
|
|
x->max_p = p->max_p;
|
|
|
|
x->c_1 = p->max_p / (p->max_th - p->min_th);
|
|
x->c_2 = SCALE_MUL(x->c_1, SCALE(p->min_th));
|
|
if (x->flags_fs & DN_IS_GENTLE_RED) {
|
|
x->c_3 = (SCALE(1) - p->max_p) / p->max_th;
|
|
x->c_4 = (SCALE(1) - 2 * p->max_p);
|
|
}
|
|
|
|
/* if the lookup table already exist, free and create it again */
|
|
if (x->w_q_lookup)
|
|
free(x->w_q_lookup, M_IPFW);
|
|
if (red_lookup_depth == 0) {
|
|
printf("\nnet.inet.ip.dummynet.red_lookup_depth must be > 0");
|
|
free(x, M_IPFW);
|
|
return EINVAL;
|
|
}
|
|
x->lookup_depth = red_lookup_depth;
|
|
x->w_q_lookup = (u_int *) malloc(x->lookup_depth * sizeof(int),
|
|
M_IPFW, M_DONTWAIT);
|
|
if (x->w_q_lookup == NULL) {
|
|
printf("sorry, cannot allocate red lookup table\n");
|
|
free(x, M_IPFW);
|
|
return ENOSPC;
|
|
}
|
|
|
|
/* fill the lookup table with (1 - w_q)^x */
|
|
x->lookup_step = p->lookup_step ;
|
|
x->lookup_weight = p->lookup_weight ;
|
|
x->w_q_lookup[0] = SCALE(1) - x->w_q;
|
|
for (i = 1; i < x->lookup_depth; i++)
|
|
x->w_q_lookup[i] = SCALE_MUL(x->w_q_lookup[i - 1], x->lookup_weight);
|
|
if (red_avg_pkt_size < 1)
|
|
red_avg_pkt_size = 512 ;
|
|
x->avg_pkt_size = red_avg_pkt_size ;
|
|
if (red_max_pkt_size < 1)
|
|
red_max_pkt_size = 1500 ;
|
|
x->max_pkt_size = red_max_pkt_size ;
|
|
return 0 ;
|
|
}
|
|
|
|
static int
|
|
alloc_hash(struct dn_flow_set *x, struct dn_flow_set *pfs)
|
|
{
|
|
if (x->flags_fs & DN_HAVE_FLOW_MASK) { /* allocate some slots */
|
|
int l = pfs->rq_size;
|
|
|
|
if (l == 0)
|
|
l = dn_hash_size;
|
|
if (l < 4)
|
|
l = 4;
|
|
else if (l > 1024)
|
|
l = 1024;
|
|
x->rq_size = l;
|
|
} else /* one is enough for null mask */
|
|
x->rq_size = 1;
|
|
x->rq = malloc((1 + x->rq_size) * sizeof(struct dn_flow_queue *),
|
|
M_IPFW, M_DONTWAIT | M_ZERO);
|
|
if (x->rq == NULL) {
|
|
printf("sorry, cannot allocate queue\n");
|
|
return ENOSPC;
|
|
}
|
|
x->rq_elements = 0;
|
|
return 0 ;
|
|
}
|
|
|
|
static void
|
|
set_fs_parms(struct dn_flow_set *x, struct dn_flow_set *src)
|
|
{
|
|
x->flags_fs = src->flags_fs;
|
|
x->qsize = src->qsize;
|
|
x->plr = src->plr;
|
|
x->flow_mask = src->flow_mask;
|
|
if (x->flags_fs & DN_QSIZE_IS_BYTES) {
|
|
if (x->qsize > 1024*1024)
|
|
x->qsize = 1024*1024 ;
|
|
} else {
|
|
if (x->qsize == 0)
|
|
x->qsize = 50 ;
|
|
if (x->qsize > 100)
|
|
x->qsize = 50 ;
|
|
}
|
|
/* configuring RED */
|
|
if ( x->flags_fs & DN_IS_RED )
|
|
config_red(src, x) ; /* XXX should check errors */
|
|
}
|
|
|
|
/*
|
|
* setup pipe or queue parameters.
|
|
*/
|
|
|
|
static int
|
|
config_pipe(struct dn_pipe *p)
|
|
{
|
|
int s ;
|
|
struct dn_flow_set *pfs = &(p->fs);
|
|
|
|
/*
|
|
* The config program passes parameters as follows:
|
|
* bw = bits/second (0 means no limits),
|
|
* delay = ms, must be translated into ticks.
|
|
* qsize = slots/bytes
|
|
*/
|
|
p->delay = ( p->delay * hz ) / 1000 ;
|
|
/* We need either a pipe number or a flow_set number */
|
|
if (p->pipe_nr == 0 && pfs->fs_nr == 0)
|
|
return EINVAL ;
|
|
if (p->pipe_nr != 0 && pfs->fs_nr != 0)
|
|
return EINVAL ;
|
|
if (p->pipe_nr != 0) { /* this is a pipe */
|
|
struct dn_pipe *x, *a, *b;
|
|
/* locate pipe */
|
|
for (a = NULL , b = all_pipes ; b && b->pipe_nr < p->pipe_nr ;
|
|
a = b , b = b->next) ;
|
|
|
|
if (b == NULL || b->pipe_nr != p->pipe_nr) { /* new pipe */
|
|
x = malloc(sizeof(struct dn_pipe), M_IPFW, M_DONTWAIT | M_ZERO);
|
|
if (x == NULL) {
|
|
printf("ip_dummynet.c: no memory for new pipe\n");
|
|
return ENOSPC;
|
|
}
|
|
x->pipe_nr = p->pipe_nr;
|
|
x->fs.pipe = x ;
|
|
/* idle_heap is the only one from which we extract from the middle.
|
|
*/
|
|
x->idle_heap.size = x->idle_heap.elements = 0 ;
|
|
x->idle_heap.offset=OFFSET_OF(struct dn_flow_queue, heap_pos);
|
|
} else
|
|
x = b;
|
|
|
|
x->bandwidth = p->bandwidth ;
|
|
x->numbytes = 0; /* just in case... */
|
|
bcopy(p->if_name, x->if_name, sizeof(p->if_name) );
|
|
x->ifp = NULL ; /* reset interface ptr */
|
|
x->delay = p->delay ;
|
|
set_fs_parms(&(x->fs), pfs);
|
|
|
|
|
|
if ( x->fs.rq == NULL ) { /* a new pipe */
|
|
s = alloc_hash(&(x->fs), pfs) ;
|
|
if (s) {
|
|
free(x, M_IPFW);
|
|
return s ;
|
|
}
|
|
s = splimp() ;
|
|
x->next = b ;
|
|
if (a == NULL)
|
|
all_pipes = x ;
|
|
else
|
|
a->next = x ;
|
|
splx(s);
|
|
}
|
|
} else { /* config queue */
|
|
struct dn_flow_set *x, *a, *b ;
|
|
|
|
/* locate flow_set */
|
|
for (a=NULL, b=all_flow_sets ; b && b->fs_nr < pfs->fs_nr ;
|
|
a = b , b = b->next) ;
|
|
|
|
if (b == NULL || b->fs_nr != pfs->fs_nr) { /* new */
|
|
if (pfs->parent_nr == 0) /* need link to a pipe */
|
|
return EINVAL ;
|
|
x = malloc(sizeof(struct dn_flow_set), M_IPFW, M_DONTWAIT | M_ZERO);
|
|
if (x == NULL) {
|
|
printf("ip_dummynet.c: no memory for new flow_set\n");
|
|
return ENOSPC;
|
|
}
|
|
x->fs_nr = pfs->fs_nr;
|
|
x->parent_nr = pfs->parent_nr;
|
|
x->weight = pfs->weight ;
|
|
if (x->weight == 0)
|
|
x->weight = 1 ;
|
|
else if (x->weight > 100)
|
|
x->weight = 100 ;
|
|
} else {
|
|
/* Change parent pipe not allowed; must delete and recreate */
|
|
if (pfs->parent_nr != 0 && b->parent_nr != pfs->parent_nr)
|
|
return EINVAL ;
|
|
x = b;
|
|
}
|
|
set_fs_parms(x, pfs);
|
|
|
|
if ( x->rq == NULL ) { /* a new flow_set */
|
|
s = alloc_hash(x, pfs) ;
|
|
if (s) {
|
|
free(x, M_IPFW);
|
|
return s ;
|
|
}
|
|
s = splimp() ;
|
|
x->next = b;
|
|
if (a == NULL)
|
|
all_flow_sets = x;
|
|
else
|
|
a->next = x;
|
|
splx(s);
|
|
}
|
|
}
|
|
return 0 ;
|
|
}
|
|
|
|
/*
|
|
* Helper function to remove from a heap queues which are linked to
|
|
* a flow_set about to be deleted.
|
|
*/
|
|
static void
|
|
fs_remove_from_heap(struct dn_heap *h, struct dn_flow_set *fs)
|
|
{
|
|
int i = 0, found = 0 ;
|
|
for (; i < h->elements ;)
|
|
if ( ((struct dn_flow_queue *)h->p[i].object)->fs == fs) {
|
|
h->elements-- ;
|
|
h->p[i] = h->p[h->elements] ;
|
|
found++ ;
|
|
} else
|
|
i++ ;
|
|
if (found)
|
|
heapify(h);
|
|
}
|
|
|
|
/*
|
|
* helper function to remove a pipe from a heap (can be there at most once)
|
|
*/
|
|
static void
|
|
pipe_remove_from_heap(struct dn_heap *h, struct dn_pipe *p)
|
|
{
|
|
if (h->elements > 0) {
|
|
int i = 0 ;
|
|
for (i=0; i < h->elements ; i++ ) {
|
|
if (h->p[i].object == p) { /* found it */
|
|
h->elements-- ;
|
|
h->p[i] = h->p[h->elements] ;
|
|
heapify(h);
|
|
break ;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* drain all queues. Called in case of severe mbuf shortage.
|
|
*/
|
|
void
|
|
dummynet_drain()
|
|
{
|
|
struct dn_flow_set *fs;
|
|
struct dn_pipe *p;
|
|
struct dn_pkt *pkt;
|
|
|
|
heap_free(&ready_heap);
|
|
heap_free(&wfq_ready_heap);
|
|
heap_free(&extract_heap);
|
|
/* remove all references to this pipe from flow_sets */
|
|
for (fs = all_flow_sets; fs; fs= fs->next )
|
|
purge_flow_set(fs, 0);
|
|
|
|
for (p = all_pipes; p; p= p->next ) {
|
|
purge_flow_set(&(p->fs), 0);
|
|
for (pkt = p->head ; pkt ; )
|
|
DN_FREE_PKT(pkt) ;
|
|
p->head = p->tail = NULL ;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Fully delete a pipe or a queue, cleaning up associated info.
|
|
*/
|
|
static int
|
|
delete_pipe(struct dn_pipe *p)
|
|
{
|
|
int s ;
|
|
struct ip_fw_chain *chain ;
|
|
|
|
if (p->pipe_nr == 0 && p->fs.fs_nr == 0)
|
|
return EINVAL ;
|
|
if (p->pipe_nr != 0 && p->fs.fs_nr != 0)
|
|
return EINVAL ;
|
|
if (p->pipe_nr != 0) { /* this is an old-style pipe */
|
|
struct dn_pipe *a, *b;
|
|
struct dn_flow_set *fs;
|
|
|
|
/* locate pipe */
|
|
for (a = NULL , b = all_pipes ; b && b->pipe_nr < p->pipe_nr ;
|
|
a = b , b = b->next) ;
|
|
if (b == NULL || (b->pipe_nr != p->pipe_nr) )
|
|
return EINVAL ; /* not found */
|
|
|
|
s = splimp() ;
|
|
|
|
/* unlink from list of pipes */
|
|
if (a == NULL)
|
|
all_pipes = b->next ;
|
|
else
|
|
a->next = b->next ;
|
|
/* remove references to this pipe from the ip_fw rules. */
|
|
for (chain = ip_fw_chain.lh_first ; chain; chain = chain->chain.le_next)
|
|
if (chain->rule->pipe_ptr == &(b->fs))
|
|
chain->rule->pipe_ptr = NULL ;
|
|
|
|
/* remove all references to this pipe from flow_sets */
|
|
for (fs = all_flow_sets; fs; fs= fs->next )
|
|
if (fs->pipe == b) {
|
|
printf("++ ref to pipe %d from fs %d\n",
|
|
p->pipe_nr, fs->fs_nr);
|
|
fs->pipe = NULL ;
|
|
purge_flow_set(fs, 0);
|
|
}
|
|
fs_remove_from_heap(&ready_heap, &(b->fs));
|
|
purge_pipe(b); /* remove all data associated to this pipe */
|
|
/* remove reference to here from extract_heap and wfq_ready_heap */
|
|
pipe_remove_from_heap(&extract_heap, b);
|
|
pipe_remove_from_heap(&wfq_ready_heap, b);
|
|
splx(s);
|
|
free(b, M_IPFW);
|
|
} else { /* this is a WF2Q queue (dn_flow_set) */
|
|
struct dn_flow_set *a, *b;
|
|
|
|
/* locate set */
|
|
for (a = NULL, b = all_flow_sets ; b && b->fs_nr < p->fs.fs_nr ;
|
|
a = b , b = b->next) ;
|
|
if (b == NULL || (b->fs_nr != p->fs.fs_nr) )
|
|
return EINVAL ; /* not found */
|
|
|
|
s = splimp() ;
|
|
if (a == NULL)
|
|
all_flow_sets = b->next ;
|
|
else
|
|
a->next = b->next ;
|
|
/* remove references to this flow_set from the ip_fw rules. */
|
|
for (chain = ip_fw_chain.lh_first; chain; chain = chain->chain.le_next)
|
|
if (chain->rule->pipe_ptr == b)
|
|
chain->rule->pipe_ptr = NULL ;
|
|
|
|
if (b->pipe != NULL) {
|
|
/* Update total weight on parent pipe and cleanup parent heaps */
|
|
b->pipe->sum -= b->weight * b->backlogged ;
|
|
fs_remove_from_heap(&(b->pipe->not_eligible_heap), b);
|
|
fs_remove_from_heap(&(b->pipe->scheduler_heap), b);
|
|
#if 1 /* XXX should i remove from idle_heap as well ? */
|
|
fs_remove_from_heap(&(b->pipe->idle_heap), b);
|
|
#endif
|
|
}
|
|
purge_flow_set(b, 1);
|
|
splx(s);
|
|
}
|
|
return 0 ;
|
|
}
|
|
|
|
/*
|
|
* helper function used to copy data from kernel in DUMMYNET_GET
|
|
*/
|
|
static char *
|
|
dn_copy_set(struct dn_flow_set *set, char *bp)
|
|
{
|
|
int i, copied = 0 ;
|
|
struct dn_flow_queue *q, *qp = (struct dn_flow_queue *)bp;
|
|
|
|
for (i = 0 ; i <= set->rq_size ; i++)
|
|
for (q = set->rq[i] ; q ; q = q->next, qp++ ) {
|
|
if (q->hash_slot != i)
|
|
printf("++ at %d: wrong slot (have %d, "
|
|
"should be %d)\n", copied, q->hash_slot, i);
|
|
if (q->fs != set)
|
|
printf("++ at %d: wrong fs ptr (have %p, should be %p)\n",
|
|
i, q->fs, set);
|
|
copied++ ;
|
|
bcopy(q, qp, sizeof( *q ) );
|
|
/* cleanup pointers */
|
|
qp->next = NULL ;
|
|
qp->head = qp->tail = NULL ;
|
|
qp->fs = NULL ;
|
|
}
|
|
if (copied != set->rq_elements)
|
|
printf("++ wrong count, have %d should be %d\n",
|
|
copied, set->rq_elements);
|
|
return (char *)qp ;
|
|
}
|
|
|
|
static int
|
|
dummynet_get(struct sockopt *sopt)
|
|
{
|
|
char *buf, *bp ; /* bp is the "copy-pointer" */
|
|
size_t size ;
|
|
struct dn_flow_set *set ;
|
|
struct dn_pipe *p ;
|
|
int s, error=0 ;
|
|
|
|
s = splimp();
|
|
/*
|
|
* compute size of data structures: list of pipes and flow_sets.
|
|
*/
|
|
for (p = all_pipes, size = 0 ; p ; p = p->next )
|
|
size += sizeof( *p ) +
|
|
p->fs.rq_elements * sizeof(struct dn_flow_queue);
|
|
for (set = all_flow_sets ; set ; set = set->next )
|
|
size += sizeof ( *set ) +
|
|
set->rq_elements * sizeof(struct dn_flow_queue);
|
|
buf = malloc(size, M_TEMP, M_DONTWAIT);
|
|
if (buf == 0) {
|
|
splx(s);
|
|
return ENOBUFS ;
|
|
}
|
|
for (p = all_pipes, bp = buf ; p ; p = p->next ) {
|
|
struct dn_pipe *pipe_bp = (struct dn_pipe *)bp ;
|
|
|
|
/*
|
|
* copy pipe descriptor into *bp, convert delay back to ms,
|
|
* then copy the flow_set descriptor(s) one at a time.
|
|
* After each flow_set, copy the queue descriptor it owns.
|
|
*/
|
|
bcopy(p, bp, sizeof( *p ) );
|
|
pipe_bp->delay = (pipe_bp->delay * 1000) / hz ;
|
|
/*
|
|
* XXX the following is a hack based on ->next being the
|
|
* first field in dn_pipe and dn_flow_set. The correct
|
|
* solution would be to move the dn_flow_set to the beginning
|
|
* of struct dn_pipe.
|
|
*/
|
|
pipe_bp->next = (struct dn_pipe *)DN_IS_PIPE ;
|
|
/* clean pointers */
|
|
pipe_bp->head = pipe_bp->tail = NULL ;
|
|
pipe_bp->fs.next = NULL ;
|
|
pipe_bp->fs.pipe = NULL ;
|
|
pipe_bp->fs.rq = NULL ;
|
|
|
|
bp += sizeof( *p ) ;
|
|
bp = dn_copy_set( &(p->fs), bp );
|
|
}
|
|
for (set = all_flow_sets ; set ; set = set->next ) {
|
|
struct dn_flow_set *fs_bp = (struct dn_flow_set *)bp ;
|
|
bcopy(set, bp, sizeof( *set ) );
|
|
/* XXX same hack as above */
|
|
fs_bp->next = (struct dn_flow_set *)DN_IS_QUEUE ;
|
|
fs_bp->pipe = NULL ;
|
|
fs_bp->rq = NULL ;
|
|
bp += sizeof( *set ) ;
|
|
bp = dn_copy_set( set, bp );
|
|
}
|
|
splx(s);
|
|
error = sooptcopyout(sopt, buf, size);
|
|
FREE(buf, M_TEMP);
|
|
return error ;
|
|
}
|
|
|
|
/*
|
|
* Handler for the various dummynet socket options (get, flush, config, del)
|
|
*/
|
|
static int
|
|
ip_dn_ctl(struct sockopt *sopt)
|
|
{
|
|
int error = 0 ;
|
|
struct dn_pipe *p, tmp_pipe;
|
|
|
|
/* Disallow sets in really-really secure mode. */
|
|
if (sopt->sopt_dir == SOPT_SET && securelevel >= 3)
|
|
return (EPERM);
|
|
|
|
switch (sopt->sopt_name) {
|
|
default :
|
|
printf("ip_dn_ctl -- unknown option %d", sopt->sopt_name);
|
|
return EINVAL ;
|
|
|
|
case IP_DUMMYNET_GET :
|
|
error = dummynet_get(sopt);
|
|
break ;
|
|
|
|
case IP_DUMMYNET_FLUSH :
|
|
dummynet_flush() ;
|
|
break ;
|
|
|
|
case IP_DUMMYNET_CONFIGURE :
|
|
p = &tmp_pipe ;
|
|
error = sooptcopyin(sopt, p, sizeof *p, sizeof *p);
|
|
if (error)
|
|
break ;
|
|
error = config_pipe(p);
|
|
break ;
|
|
|
|
case IP_DUMMYNET_DEL : /* remove a pipe or queue */
|
|
p = &tmp_pipe ;
|
|
error = sooptcopyin(sopt, p, sizeof *p, sizeof *p);
|
|
if (error)
|
|
break ;
|
|
|
|
error = delete_pipe(p);
|
|
break ;
|
|
}
|
|
return error ;
|
|
}
|
|
|
|
static void
|
|
ip_dn_init(void)
|
|
{
|
|
printf("DUMMYNET initialized (010124)\n");
|
|
all_pipes = NULL ;
|
|
all_flow_sets = NULL ;
|
|
ready_heap.size = ready_heap.elements = 0 ;
|
|
ready_heap.offset = 0 ;
|
|
|
|
wfq_ready_heap.size = wfq_ready_heap.elements = 0 ;
|
|
wfq_ready_heap.offset = 0 ;
|
|
|
|
extract_heap.size = extract_heap.elements = 0 ;
|
|
extract_heap.offset = 0 ;
|
|
ip_dn_ctl_ptr = ip_dn_ctl;
|
|
timeout(dummynet, NULL, 1);
|
|
}
|
|
|
|
static ip_dn_ctl_t *old_dn_ctl_ptr ;
|
|
|
|
static int
|
|
dummynet_modevent(module_t mod, int type, void *data)
|
|
{
|
|
int s ;
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
s = splimp();
|
|
old_dn_ctl_ptr = ip_dn_ctl_ptr;
|
|
ip_dn_init();
|
|
splx(s);
|
|
break;
|
|
case MOD_UNLOAD:
|
|
s = splimp();
|
|
ip_dn_ctl_ptr = old_dn_ctl_ptr;
|
|
splx(s);
|
|
dummynet_flush();
|
|
break ;
|
|
default:
|
|
break ;
|
|
}
|
|
return 0 ;
|
|
}
|
|
|
|
static moduledata_t dummynet_mod = {
|
|
"dummynet",
|
|
dummynet_modevent,
|
|
NULL
|
|
} ;
|
|
DECLARE_MODULE(dummynet, dummynet_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|