f0068c4a70
to something more recent than the ancient 1.2 release contained in 4.4. This code has the following advantages as compared to previous versions (culled from the README file for the SunOS release): - True multicast delivery - Configurable rate-limiting of forwarded multicast traffic on each physical interface or tunnel, using a token-bucket limiter. - Simplistic classification of packets for prioritized dropping. - Administrative scoping of multicast address ranges. - Faster detection of hosts leaving groups. - Support for multicast traceroute (code not yet available). - Support for RSVP, the Resource Reservation Protocol. What still needs to be done: - The multicast forwarder needs testing. - The multicast routing daemon needs to be ported. - Network interface drivers need to have the `#ifdef MULTICAST' goop ripped out of them. - The IGMP code should probably be bogon-tested. Some notes about the porting process: In some cases, the Berkeley people decided to incorporate functionality from later releases of the multicast code, but then had to do things differently. As a result, if you look at Deering's patches, and then look at our code, it is not always obvious whether the patch even applies. Let the reader beware. I ran ip_mroute.c through several passes of `unifdef' to get rid of useless grot, and to permanently enable the RSVP support, which we will include as standard. Ported by: Garrett Wollman Submitted by: Steve Deering and Ajit Thyagarajan (among others)
219 lines
7.3 KiB
C
219 lines
7.3 KiB
C
/*
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* Copyright (c) 1985, 1986, 1993
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* The Regents of the University of California. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)in_var.h 8.1 (Berkeley) 6/10/93
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* $Id: in_var.h,v 1.5 1994/08/21 05:27:30 paul Exp $
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*/
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#ifndef _NETINET_IN_VAR_H_
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#define _NETINET_IN_VAR_H_
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/*
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* Interface address, Internet version. One of these structures
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* is allocated for each interface with an Internet address.
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* The ifaddr structure contains the protocol-independent part
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* of the structure and is assumed to be first.
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*/
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struct in_ifaddr {
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struct ifaddr ia_ifa; /* protocol-independent info */
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#define ia_ifp ia_ifa.ifa_ifp
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#define ia_flags ia_ifa.ifa_flags
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/* ia_{,sub}net{,mask} in host order */
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u_long ia_net; /* network number of interface */
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u_long ia_netmask; /* mask of net part */
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u_long ia_subnet; /* subnet number, including net */
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u_long ia_subnetmask; /* mask of subnet part */
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struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
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struct in_ifaddr *ia_next; /* next in list of internet addresses */
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struct sockaddr_in ia_addr; /* reserve space for interface name */
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struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
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#define ia_broadaddr ia_dstaddr
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struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
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struct in_multi *ia_multiaddrs; /* list of multicast addresses */
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};
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struct in_aliasreq {
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char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
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struct sockaddr_in ifra_addr;
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struct sockaddr_in ifra_broadaddr;
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#define ifra_dstaddr ifra_broadaddr
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struct sockaddr_in ifra_mask;
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};
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/*
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* Given a pointer to an in_ifaddr (ifaddr),
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* return a pointer to the addr as a sockaddr_in.
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*/
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#define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))
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#define IN_LNAOF(in, ifa) \
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((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
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#ifdef KERNEL
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extern struct in_ifaddr *in_ifaddr;
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extern struct ifqueue ipintrq; /* ip packet input queue */
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/*
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* Macro for finding the interface (ifnet structure) corresponding to one
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* of our IP addresses.
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*/
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#define INADDR_TO_IFP(addr, ifp) \
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/* struct in_addr addr; */ \
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/* struct ifnet *ifp; */ \
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{ \
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register struct in_ifaddr *ia; \
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\
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for (ia = in_ifaddr; \
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ia != NULL && IA_SIN(ia)->sin_addr.s_addr != (addr).s_addr; \
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ia = ia->ia_next) \
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continue; \
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(ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
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}
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/*
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* Macro for finding the internet address structure (in_ifaddr) corresponding
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* to a given interface (ifnet structure).
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*/
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#define IFP_TO_IA(ifp, ia) \
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/* struct ifnet *ifp; */ \
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/* struct in_ifaddr *ia; */ \
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{ \
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for ((ia) = in_ifaddr; \
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(ia) != NULL && (ia)->ia_ifp != (ifp); \
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(ia) = (ia)->ia_next) \
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continue; \
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}
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#endif
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/*
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* This information should be part of the ifnet structure but we don't wish
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* to change that - as it might break a number of things
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*/
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struct router_info {
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struct ifnet *ifp;
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int type; /* type of router which is querier on this interface */
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int time; /* # of slow timeouts since last old query */
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struct router_info *next;
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};
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/*
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* Internet multicast address structure. There is one of these for each IP
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* multicast group to which this host belongs on a given network interface.
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* They are kept in a linked list, rooted in the interface's in_ifaddr
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* structure.
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*/
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struct in_multi {
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struct in_addr inm_addr; /* IP multicast address */
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struct ifnet *inm_ifp; /* back pointer to ifnet */
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struct in_ifaddr *inm_ia; /* back pointer to in_ifaddr */
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u_int inm_refcount; /* no. membership claims by sockets */
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u_int inm_timer; /* IGMP membership report timer */
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struct in_multi *inm_next; /* ptr to next multicast address */
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u_int inm_state; /* state of the membership */
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struct router_info *inm_rti; /* router info*/
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};
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#ifdef KERNEL
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/*
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* Structure used by macros below to remember position when stepping through
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* all of the in_multi records.
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*/
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struct in_multistep {
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struct in_ifaddr *i_ia;
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struct in_multi *i_inm;
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};
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/*
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* Macro for looking up the in_multi record for a given IP multicast address
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* on a given interface. If no matching record is found, "inm" returns NULL.
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*/
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#define IN_LOOKUP_MULTI(addr, ifp, inm) \
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/* struct in_addr addr; */ \
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/* struct ifnet *ifp; */ \
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/* struct in_multi *inm; */ \
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{ \
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register struct in_ifaddr *ia; \
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\
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IFP_TO_IA((ifp), ia); \
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if (ia == NULL) \
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(inm) = NULL; \
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else \
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for ((inm) = ia->ia_multiaddrs; \
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(inm) != NULL && (inm)->inm_addr.s_addr != (addr).s_addr; \
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(inm) = inm->inm_next) \
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continue; \
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}
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/*
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* Macro to step through all of the in_multi records, one at a time.
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* The current position is remembered in "step", which the caller must
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* provide. IN_FIRST_MULTI(), below, must be called to initialize "step"
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* and get the first record. Both macros return a NULL "inm" when there
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* are no remaining records.
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*/
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#define IN_NEXT_MULTI(step, inm) \
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/* struct in_multistep step; */ \
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/* struct in_multi *inm; */ \
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{ \
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if (((inm) = (step).i_inm) != NULL) \
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(step).i_inm = (inm)->inm_next; \
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else \
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while ((step).i_ia != NULL) { \
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(inm) = (step).i_ia->ia_multiaddrs; \
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(step).i_ia = (step).i_ia->ia_next; \
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if ((inm) != NULL) { \
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(step).i_inm = (inm)->inm_next; \
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break; \
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} \
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} \
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}
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#define IN_FIRST_MULTI(step, inm) \
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/* struct in_multistep step; */ \
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/* struct in_multi *inm; */ \
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{ \
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(step).i_ia = in_ifaddr; \
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(step).i_inm = NULL; \
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IN_NEXT_MULTI((step), (inm)); \
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}
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int in_ifinit __P((struct ifnet *,
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struct in_ifaddr *, struct sockaddr_in *, int));
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struct in_multi *in_addmulti __P((struct in_addr *, struct ifnet *));
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void in_delmulti __P((struct in_multi *));
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void in_ifscrub __P((struct ifnet *, struct in_ifaddr *));
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int in_control __P((struct socket *, int, caddr_t, struct ifnet *));
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#endif
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#endif
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