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03c612662b
similar to ipfilter's keep-state. Look at the updated ipfw(8) manpage for details. Approved-by: jordan
156 lines
5.1 KiB
C
156 lines
5.1 KiB
C
/*
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* Copyright (c) 1998-2000 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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#ifndef _IP_DUMMYNET_H
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#define _IP_DUMMYNET_H
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/*
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* Definition of dummynet data structures.
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* We first start with the heap which is used by the scheduler.
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*
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* Each list contains a set of parameters identifying the pipe, and
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* a set of packets queued on the pipe itself.
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*
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* I could have used queue macros, but the management i have
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* is pretty simple and this makes the code more portable.
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*/
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typedef u_int32_t dn_key ; /* sorting key */
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#define DN_KEY_LT(a,b) ((int)((a)-(b)) < 0)
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#define DN_KEY_LEQ(a,b) ((int)((a)-(b)) <= 0)
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#define DN_KEY_GT(a,b) ((int)((a)-(b)) > 0)
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#define DN_KEY_GEQ(a,b) ((int)((a)-(b)) >= 0)
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struct dn_heap_entry {
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dn_key key ; /* sorting key. Topmost element is smallest one */
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void *object ; /* object pointer */
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} ;
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struct dn_heap {
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int size ;
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int elements ;
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struct dn_heap_entry *p ; /* really an array of "size" entries */
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} ;
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/*
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* MT_DUMMYNET is a new (fake) mbuf type that is prepended to the
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* packet when it comes out of a pipe. The definition
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* ought to go in /sys/sys/mbuf.h but here it is less intrusive.
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*/
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#define MT_DUMMYNET MT_CONTROL
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/*
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* struct dn_pkt identifies a packet in the dummynet queue. The
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* first part is really an m_hdr for implementation purposes, and some
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* fields are saved there. When passing the packet back to the ip_input/
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* ip_output(), the struct is prepended to the mbuf chain with type
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* MT_DUMMYNET, and contains the pointer to the matching rule.
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*/
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struct dn_pkt {
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struct m_hdr hdr ;
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#define dn_next hdr.mh_nextpkt /* next element in queue */
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#define DN_NEXT(x) (struct dn_pkt *)(x)->dn_next
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#define dn_m hdr.mh_next /* packet to be forwarded */
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/* #define dn_dst hdr.mh_len -* dst, for ip_output */
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#define dn_dir hdr.mh_flags /* action when pkt extracted from a queue */
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#define DN_TO_IP_OUT 1
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#define DN_TO_IP_IN 2
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#define DN_TO_BDG_FWD 3
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dn_key output_time; /* when the pkt is due for delivery */
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struct ifnet *ifp; /* interface, for ip_output */
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struct sockaddr_in *dn_dst ;
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struct route ro; /* route, for ip_output. MUST COPY */
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int flags ; /* flags, for ip_output (IPv6 ?) */
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};
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struct dn_queue {
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struct dn_pkt *head, *tail;
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} ;
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/*
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* We use per flow queues. Hashing is used to select the right slot,
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* then we scan the list to match the flow-id.
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* The pipe is shared as it is only a delay line and thus one is enough.
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*/
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struct dn_flow_queue {
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struct dn_flow_queue *next ;
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struct ipfw_flow_id id ;
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struct dn_pipe *p ; /* parent pipe */
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struct dn_queue r;
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long numbytes ;
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u_int len ;
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u_int len_bytes ;
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u_int64_t tot_pkts ; /* statistics counters */
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u_int64_t tot_bytes ;
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u_int32_t drops ;
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int hash_slot ; /* debugging/diagnostic */
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} ;
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/*
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* Pipe descriptor. Contains global parameters, delay-line queue,
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* and the hash array of the per-flow queues.
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*/
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struct dn_pipe { /* a pipe */
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struct dn_pipe *next ;
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u_short pipe_nr ; /* number */
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u_short flags ; /* to speed up things */
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#define DN_HAVE_FLOW_MASK 8
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int bandwidth; /* really, bytes/tick. */
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int queue_size ;
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int queue_size_bytes ;
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int delay ; /* really, ticks */
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int plr ; /* pkt loss rate (2^31-1 means 100%) */
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struct dn_queue p ;
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struct ipfw_flow_id flow_mask ;
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int rq_size ;
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int rq_elements ;
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struct dn_flow_queue **rq ; /* array of rq_size entries */
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};
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#ifdef _KERNEL
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MALLOC_DECLARE(M_IPFW);
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typedef int ip_dn_ctl_t __P((struct sockopt *)) ;
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extern ip_dn_ctl_t *ip_dn_ctl_ptr;
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void dn_rule_delete(void *r); /* used in ip_fw.c */
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int dummynet_io(int pipe, int dir,
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struct mbuf *m, struct ifnet *ifp, struct route *ro,
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struct sockaddr_in * dst,
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struct ip_fw_chain *rule, int flags);
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#endif
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#endif /* _IP_DUMMYNET_H */
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