1f91d8c563
NetBSD, ported to FreeBSD by Pierre Beyssac <pb@fasterix.freenix.org> and minorly tweaked by me. This is a standard part of FreeBSD, but must be enabled with: "sysctl -w net.inet.ip.fastforwarding=1" ...and of course forwarding must also be enabled. This should probably be modified to use the zone allocator for speed and space efficiency. The current algorithm also appears to lose if the number of active paths exceeds IPFLOW_MAX (256), in which case it wastes lots of time trying to figure out which cache entry to drop.
230 lines
8.1 KiB
C
230 lines
8.1 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 8.2 (Berkeley) 1/9/95
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* $Id: in_var.h,v 1.27 1997/09/07 05:26:43 bde 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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#include <sys/queue.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 Internet address on an interface.
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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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TAILQ_ENTRY(in_ifaddr) ia_link; /* tailq macro glue */
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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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};
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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 IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
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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 TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
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extern struct ifqueue ipintrq; /* ip packet input queue */
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extern struct in_addr zeroin_addr;
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extern u_char inetctlerrmap[];
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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_ifaddrhead.tqh_first; \
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ia != NULL && ((ia->ia_ifp->if_flags & IFF_POINTOPOINT)? \
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IA_DSTSIN(ia):IA_SIN(ia))->sin_addr.s_addr != (addr).s_addr; \
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ia = ia->ia_link.tqe_next) \
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continue; \
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if (ia == NULL) \
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for (ia = in_ifaddrhead.tqh_first; \
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ia != NULL; \
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ia = ia->ia_link.tqe_next) \
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if (ia->ia_ifp->if_flags & IFF_POINTOPOINT && \
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IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
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break; \
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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_ifaddrhead.tqh_first; \
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(ia) != NULL && (ia)->ia_ifp != (ifp); \
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(ia) = (ia)->ia_link.tqe_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 *rti_ifp;
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int rti_type; /* type of router which is querier on this interface */
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int rti_time; /* # of slow timeouts since last old query */
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struct router_info *rti_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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* For every entry on the interface's if_multiaddrs list which represents
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* an IP multicast group, there is one of these structures. They are also
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* kept on a system-wide list to make it easier to keep our legacy IGMP code
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* compatible with the rest of the world (see IN_FIRST_MULTI et al, below).
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*/
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struct in_multi {
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LIST_ENTRY(in_multi) inm_link; /* queue macro glue */
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struct in_addr inm_addr; /* IP multicast address, convenience */
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struct ifnet *inm_ifp; /* back pointer to ifnet */
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struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */
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u_int inm_timer; /* IGMP membership report timer */
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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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extern LIST_HEAD(in_multihead, in_multi) in_multihead;
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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_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" is set 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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do { \
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register struct ifmultiaddr *ifma; \
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\
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for (ifma = (ifp)->if_multiaddrs.lh_first; ifma; \
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ifma = ifma->ifma_link.le_next) { \
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if (ifma->ifma_addr->sa_family == AF_INET \
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&& ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \
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(addr).s_addr) \
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break; \
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} \
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(inm) = ifma ? ifma->ifma_protospec : 0; \
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} while(0)
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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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do { \
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if (((inm) = (step).i_inm) != NULL) \
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(step).i_inm = (step).i_inm->inm_link.le_next; \
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} while(0)
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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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do { \
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(step).i_inm = in_multihead.lh_first; \
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IN_NEXT_MULTI((step), (inm)); \
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} while(0)
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struct route;
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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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int in_control __P((struct socket *, int, caddr_t, struct ifnet *,
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struct proc *));
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void in_rtqdrain __P((void));
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void ip_input __P((struct mbuf *));
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int in_ifadown __P((struct ifaddr *ifa));
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void in_ifscrub __P((struct ifnet *, struct in_ifaddr *));
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int ipflow_fastforward __P((struct mbuf *));
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void ipflow_create __P((const struct route *, struct mbuf *));
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void ipflow_slowtimo __P((void));
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#endif /* KERNEL */
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#endif /* _NETINET_IN_VAR_H_ */
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