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75c1354190
This is a seriously beefed up chroot kind of thing. The process is jailed along the same lines as a chroot does it, but with additional tough restrictions imposed on what the superuser can do. For all I know, it is safe to hand over the root bit inside a prison to the customer living in that prison, this is what it was developed for in fact: "real virtual servers". Each prison has an ip number associated with it, which all IP communications will be coerced to use and each prison has its own hostname. Needless to say, you need more RAM this way, but the advantage is that each customer can run their own particular version of apache and not stomp on the toes of their neighbors. It generally does what one would expect, but setting up a jail still takes a little knowledge. A few notes: I have no scripts for setting up a jail, don't ask me for them. The IP number should be an alias on one of the interfaces. mount a /proc in each jail, it will make ps more useable. /proc/<pid>/status tells the hostname of the prison for jailed processes. Quotas are only sensible if you have a mountpoint per prison. There are no privisions for stopping resource-hogging. Some "#ifdef INET" and similar may be missing (send patches!) If somebody wants to take it from here and develop it into more of a "virtual machine" they should be most welcome! Tools, comments, patches & documentation most welcome. Have fun... Sponsored by: http://www.rndassociates.com/ Run for almost a year by: http://www.servetheweb.com/
175 lines
7.0 KiB
C
175 lines
7.0 KiB
C
/*
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* Copyright (c) 1982, 1986, 1990, 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_pcb.h 8.1 (Berkeley) 6/10/93
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* $Id: in_pcb.h,v 1.26 1998/05/15 20:11:33 wollman Exp $
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*/
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#ifndef _NETINET_IN_PCB_H_
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#define _NETINET_IN_PCB_H_
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#include <sys/queue.h>
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/*
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* Common structure pcb for internet protocol implementation.
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* Here are stored pointers to local and foreign host table
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* entries, local and foreign socket numbers, and pointers
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* up (to a socket structure) and down (to a protocol-specific)
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* control block.
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*/
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LIST_HEAD(inpcbhead, inpcb);
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LIST_HEAD(inpcbporthead, inpcbport);
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typedef u_quad_t inp_gen_t;
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/*
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* NB: the zone allocator is type-stable EXCEPT FOR THE FIRST TWO LONGS
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* of the structure. Therefore, it is important that the members in
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* that position not contain any information which is required to be
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* stable.
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*/
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struct inpcb {
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LIST_ENTRY(inpcb) inp_hash; /* hash list */
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struct in_addr inp_faddr; /* foreign host table entry */
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struct in_addr inp_laddr; /* local host table entry */
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u_short inp_fport; /* foreign port */
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u_short inp_lport; /* local port */
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LIST_ENTRY(inpcb) inp_list; /* list for all PCBs of this proto */
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caddr_t inp_ppcb; /* pointer to per-protocol pcb */
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struct inpcbinfo *inp_pcbinfo; /* PCB list info */
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struct socket *inp_socket; /* back pointer to socket */
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struct mbuf *inp_options; /* IP options */
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struct route inp_route; /* placeholder for routing entry */
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int inp_flags; /* generic IP/datagram flags */
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u_char inp_ip_tos; /* type of service proto */
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u_char inp_ip_ttl; /* time to live proto */
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u_char inp_ip_p; /* protocol proto */
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u_char pad[1]; /* alignment */
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struct ip_moptions *inp_moptions; /* IP multicast options */
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LIST_ENTRY(inpcb) inp_portlist; /* list for this PCB's local port */
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struct inpcbport *inp_phd; /* head of this list */
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inp_gen_t inp_gencnt; /* generation count of this instance */
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};
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/*
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* The range of the generation count, as used in this implementation,
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* is 9e19. We would have to create 300 billion connections per
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* second for this number to roll over in a year. This seems sufficiently
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* unlikely that we simply don't concern ourselves with that possibility.
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*/
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/*
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* Interface exported to userland by various protocols which use
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* inpcbs. Hack alert -- only define if struct xsocket is in scope.
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*/
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#ifdef _SYS_SOCKETVAR_H_
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struct xinpcb {
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size_t xi_len; /* length of this structure */
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struct inpcb xi_inp;
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struct xsocket xi_socket;
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u_quad_t xi_alignment_hack;
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};
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struct xinpgen {
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size_t xig_len; /* length of this structure */
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u_int xig_count; /* number of PCBs at this time */
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inp_gen_t xig_gen; /* generation count at this time */
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so_gen_t xig_sogen; /* socket generation count at this time */
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};
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#endif /* _SYS_SOCKETVAR_H_ */
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struct inpcbport {
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LIST_ENTRY(inpcbport) phd_hash;
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struct inpcbhead phd_pcblist;
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u_short phd_port;
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};
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struct inpcbinfo { /* XXX documentation, prefixes */
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struct inpcbhead *hashbase;
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u_long hashmask;
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struct inpcbporthead *porthashbase;
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u_long porthashmask;
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struct inpcbhead *listhead;
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u_short lastport;
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u_short lastlow;
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u_short lasthi;
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struct vm_zone *ipi_zone; /* zone to allocate pcbs from */
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u_int ipi_count; /* number of pcbs in this list */
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u_quad_t ipi_gencnt; /* current generation count */
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};
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#define INP_PCBHASH(faddr, lport, fport, mask) \
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(((faddr) ^ ((faddr) >> 16) ^ ntohs((lport) ^ (fport))) & (mask))
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#define INP_PCBPORTHASH(lport, mask) \
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(ntohs((lport)) & (mask))
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/* flags in inp_flags: */
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#define INP_RECVOPTS 0x01 /* receive incoming IP options */
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#define INP_RECVRETOPTS 0x02 /* receive IP options for reply */
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#define INP_RECVDSTADDR 0x04 /* receive IP dst address */
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#define INP_HDRINCL 0x08 /* user supplies entire IP header */
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#define INP_HIGHPORT 0x10 /* user wants "high" port binding */
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#define INP_LOWPORT 0x20 /* user wants "low" port binding */
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#define INP_ANONPORT 0x40 /* port chosen for user */
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#define INP_RECVIF 0x80 /* receive incoming interface */
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#define INP_MTUDISC 0x100 /* user can do MTU discovery */
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#define INP_CONTROLOPTS (INP_RECVOPTS|INP_RECVRETOPTS|INP_RECVDSTADDR|\
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INP_RECVIF)
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#define INPLOOKUP_WILDCARD 1
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#define sotoinpcb(so) ((struct inpcb *)(so)->so_pcb)
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#ifdef KERNEL
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void in_losing __P((struct inpcb *));
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int in_pcballoc __P((struct socket *, struct inpcbinfo *, struct proc *));
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int in_pcbbind __P((struct inpcb *, struct sockaddr *, struct proc *));
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int in_pcbconnect __P((struct inpcb *, struct sockaddr *, struct proc *));
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void in_pcbdetach __P((struct inpcb *));
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void in_pcbdisconnect __P((struct inpcb *));
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int in_pcbinshash __P((struct inpcb *));
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int in_pcbladdr __P((struct inpcb *, struct sockaddr *,
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struct sockaddr_in **));
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struct inpcb *
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in_pcblookup_local __P((struct inpcbinfo *,
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struct in_addr, u_int, int));
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struct inpcb *
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in_pcblookup_hash __P((struct inpcbinfo *,
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struct in_addr, u_int, struct in_addr, u_int, int));
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void in_pcbnotify __P((struct inpcbhead *, struct sockaddr *,
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u_int, struct in_addr, u_int, int, void (*)(struct inpcb *, int)));
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void in_pcbrehash __P((struct inpcb *));
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int in_setpeeraddr __P((struct socket *so, struct sockaddr **nam));
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int in_setsockaddr __P((struct socket *so, struct sockaddr **nam));
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int prison_xinpcb __P((struct proc *p, struct inpcb *inp));
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#endif /* KERNEL */
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#endif /* !_NETINET_IN_PCB_H_ */
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