The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_pcb.h

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    1 /*
    2  * Copyright (c) 1982, 1986, 1990, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)in_pcb.h    8.1 (Berkeley) 6/10/93
   34  * $FreeBSD: releng/5.1/sys/netinet/in_pcb.h 114258 2003-04-29 21:36:18Z mdodd $
   35  */
   36 
   37 #ifndef _NETINET_IN_PCB_H_
   38 #define _NETINET_IN_PCB_H_
   39 
   40 #include <sys/queue.h>
   41 #include <sys/_lock.h>
   42 #include <sys/_mutex.h>
   43 
   44 #include <net/route.h>
   45 
   46 #define in6pcb          inpcb   /* for KAME src sync over BSD*'s */
   47 #define in6p_sp         inp_sp  /* for KAME src sync over BSD*'s */
   48 struct inpcbpolicy;
   49 
   50 /*
   51  * Common structure pcb for internet protocol implementation.
   52  * Here are stored pointers to local and foreign host table
   53  * entries, local and foreign socket numbers, and pointers
   54  * up (to a socket structure) and down (to a protocol-specific)
   55  * control block.
   56  */
   57 LIST_HEAD(inpcbhead, inpcb);
   58 LIST_HEAD(inpcbporthead, inpcbport);
   59 typedef u_quad_t        inp_gen_t;
   60 
   61 /*
   62  * PCB with AF_INET6 null bind'ed laddr can receive AF_INET input packet.
   63  * So, AF_INET6 null laddr is also used as AF_INET null laddr,
   64  * by utilize following structure. (At last, same as INRIA)
   65  */
   66 struct in_addr_4in6 {
   67         u_int32_t       ia46_pad32[3];
   68         struct  in_addr ia46_addr4;
   69 };
   70 
   71 /*
   72  * NOTE: ipv6 addrs should be 64-bit aligned, per RFC 2553.
   73  * in_conninfo has some extra padding to accomplish this.
   74  */
   75 struct in_endpoints {
   76         u_int16_t       ie_fport;               /* foreign port */
   77         u_int16_t       ie_lport;               /* local port */
   78         /* protocol dependent part, local and foreign addr */
   79         union {
   80                 /* foreign host table entry */
   81                 struct  in_addr_4in6 ie46_foreign;
   82                 struct  in6_addr ie6_foreign;
   83         } ie_dependfaddr;
   84         union {
   85                 /* local host table entry */
   86                 struct  in_addr_4in6 ie46_local;
   87                 struct  in6_addr ie6_local;
   88         } ie_dependladdr;
   89 #define ie_faddr        ie_dependfaddr.ie46_foreign.ia46_addr4
   90 #define ie_laddr        ie_dependladdr.ie46_local.ia46_addr4
   91 #define ie6_faddr       ie_dependfaddr.ie6_foreign
   92 #define ie6_laddr       ie_dependladdr.ie6_local
   93 };
   94 
   95 /*
   96  * XXX
   97  * At some point struct route should possibly change to:
   98  *   struct rtentry *rt
   99  *   struct in_endpoints *ie; 
  100  */
  101 struct in_conninfo {
  102         u_int8_t        inc_flags;
  103         u_int8_t        inc_len;
  104         u_int16_t       inc_pad;        /* XXX alignment for in_endpoints */
  105         /* protocol dependent part; cached route */
  106         struct  in_endpoints inc_ie;
  107         union {
  108                 /* placeholder for routing entry */
  109                 struct  route inc4_route;
  110                 struct  route_in6 inc6_route;
  111         } inc_dependroute;
  112 };
  113 #define inc_isipv6      inc_flags       /* temp compatability */
  114 #define inc_fport       inc_ie.ie_fport
  115 #define inc_lport       inc_ie.ie_lport
  116 #define inc_faddr       inc_ie.ie_faddr
  117 #define inc_laddr       inc_ie.ie_laddr
  118 #define inc_route       inc_dependroute.inc4_route
  119 #define inc6_faddr      inc_ie.ie6_faddr
  120 #define inc6_laddr      inc_ie.ie6_laddr
  121 #define inc6_route      inc_dependroute.inc6_route
  122 
  123 struct  icmp6_filter;
  124 
  125 struct inpcb {
  126         LIST_ENTRY(inpcb) inp_hash; /* hash list */
  127         LIST_ENTRY(inpcb) inp_list; /* list for all PCBs of this proto */
  128         u_int32_t       inp_flow;
  129 
  130         /* local and foreign ports, local and foreign addr */
  131         struct  in_conninfo inp_inc;
  132 
  133         caddr_t inp_ppcb;               /* pointer to per-protocol pcb */
  134         struct  inpcbinfo *inp_pcbinfo; /* PCB list info */
  135         struct  socket *inp_socket;     /* back pointer to socket */
  136                                         /* list for this PCB's local port */
  137         int     inp_flags;              /* generic IP/datagram flags */
  138 
  139         struct  inpcbpolicy *inp_sp; /* for IPSEC */
  140         u_char  inp_vflag;              /* IP version flag (v4/v6) */
  141 #define INP_IPV4        0x1
  142 #define INP_IPV6        0x2
  143 #define INP_IPV6PROTO   0x4             /* opened under IPv6 protocol */
  144 #define INP_TIMEWAIT    0x8             /* .. probably doesn't go here */
  145         u_char  inp_ip_ttl;             /* time to live proto */
  146         u_char  inp_ip_p;               /* protocol proto */
  147 
  148         /* protocol dependent part; options */
  149         struct {
  150                 u_char  inp4_ip_tos;            /* type of service proto */
  151                 struct  mbuf *inp4_options;     /* IP options */
  152                 struct  ip_moptions *inp4_moptions; /* IP multicast options */
  153         } inp_depend4;
  154 #define inp_fport       inp_inc.inc_fport
  155 #define inp_lport       inp_inc.inc_lport
  156 #define inp_faddr       inp_inc.inc_faddr
  157 #define inp_laddr       inp_inc.inc_laddr
  158 #define inp_route       inp_inc.inc_route
  159 #define inp_ip_tos      inp_depend4.inp4_ip_tos
  160 #define inp_options     inp_depend4.inp4_options
  161 #define inp_moptions    inp_depend4.inp4_moptions
  162         struct {
  163                 /* IP options */
  164                 struct  mbuf *inp6_options;
  165                 /* IP6 options for outgoing packets */
  166                 struct  ip6_pktopts *inp6_outputopts;
  167                 /* IP multicast options */
  168                 struct  ip6_moptions *inp6_moptions;
  169                 /* ICMPv6 code type filter */
  170                 struct  icmp6_filter *inp6_icmp6filt;
  171                 /* IPV6_CHECKSUM setsockopt */
  172                 int     inp6_cksum;
  173                 u_short inp6_ifindex;
  174                 short   inp6_hops;
  175                 u_int8_t        inp6_hlim;
  176         } inp_depend6;
  177         LIST_ENTRY(inpcb) inp_portlist;
  178         struct  inpcbport *inp_phd;     /* head of this list */
  179         inp_gen_t       inp_gencnt;     /* generation count of this instance */
  180         struct mtx      inp_mtx;
  181 
  182 #define in6p_faddr      inp_inc.inc6_faddr
  183 #define in6p_laddr      inp_inc.inc6_laddr
  184 #define in6p_route      inp_inc.inc6_route
  185 #define in6p_ip6_hlim   inp_depend6.inp6_hlim
  186 #define in6p_hops       inp_depend6.inp6_hops   /* default hop limit */
  187 #define in6p_ip6_nxt    inp_ip_p
  188 #define in6p_flowinfo   inp_flow
  189 #define in6p_vflag      inp_vflag
  190 #define in6p_options    inp_depend6.inp6_options
  191 #define in6p_outputopts inp_depend6.inp6_outputopts
  192 #define in6p_moptions   inp_depend6.inp6_moptions
  193 #define in6p_icmp6filt  inp_depend6.inp6_icmp6filt
  194 #define in6p_cksum      inp_depend6.inp6_cksum
  195 #define inp6_ifindex    inp_depend6.inp6_ifindex
  196 #define in6p_flags      inp_flags  /* for KAME src sync over BSD*'s */
  197 #define in6p_socket     inp_socket  /* for KAME src sync over BSD*'s */
  198 #define in6p_lport      inp_lport  /* for KAME src sync over BSD*'s */
  199 #define in6p_fport      inp_fport  /* for KAME src sync over BSD*'s */
  200 #define in6p_ppcb       inp_ppcb  /* for KAME src sync over BSD*'s */
  201 };
  202 /*
  203  * The range of the generation count, as used in this implementation,
  204  * is 9e19.  We would have to create 300 billion connections per
  205  * second for this number to roll over in a year.  This seems sufficiently
  206  * unlikely that we simply don't concern ourselves with that possibility.
  207  */
  208 
  209 /*
  210  * Interface exported to userland by various protocols which use
  211  * inpcbs.  Hack alert -- only define if struct xsocket is in scope.
  212  */
  213 #ifdef _SYS_SOCKETVAR_H_
  214 struct  xinpcb {
  215         size_t  xi_len;         /* length of this structure */
  216         struct  inpcb xi_inp;
  217         struct  xsocket xi_socket;
  218         u_quad_t        xi_alignment_hack;
  219 };
  220 
  221 struct  xinpgen {
  222         size_t  xig_len;        /* length of this structure */
  223         u_int   xig_count;      /* number of PCBs at this time */
  224         inp_gen_t xig_gen;      /* generation count at this time */
  225         so_gen_t xig_sogen;     /* socket generation count at this time */
  226 };
  227 #endif /* _SYS_SOCKETVAR_H_ */
  228 
  229 struct inpcbport {
  230         LIST_ENTRY(inpcbport) phd_hash;
  231         struct inpcbhead phd_pcblist;
  232         u_short phd_port;
  233 };
  234 
  235 struct inpcbinfo {              /* XXX documentation, prefixes */
  236         struct  inpcbhead *hashbase;
  237         u_long  hashmask;
  238         struct  inpcbporthead *porthashbase;
  239         u_long  porthashmask;
  240         struct  inpcbhead *listhead;
  241         u_short lastport;
  242         u_short lastlow;
  243         u_short lasthi;
  244         struct  uma_zone *ipi_zone; /* zone to allocate pcbs from */
  245         u_int   ipi_count;      /* number of pcbs in this list */
  246         u_quad_t ipi_gencnt;    /* current generation count */
  247         struct  mtx ipi_mtx;
  248 };
  249 
  250 #define INP_LOCK_INIT(inp, d) \
  251         mtx_init(&(inp)->inp_mtx, (d), NULL, MTX_DEF | MTX_RECURSE | MTX_DUPOK)
  252 #define INP_LOCK_DESTROY(inp)   mtx_destroy(&(inp)->inp_mtx)
  253 #define INP_LOCK(inp)           mtx_lock(&(inp)->inp_mtx)
  254 #define INP_UNLOCK(inp)         mtx_unlock(&(inp)->inp_mtx)
  255 
  256 #define INP_INFO_LOCK_INIT(ipi, d) \
  257         mtx_init(&(ipi)->ipi_mtx, (d), NULL, MTX_DEF | MTX_RECURSE)
  258 #define INP_INFO_RLOCK(ipi)     mtx_lock(&(ipi)->ipi_mtx)
  259 #define INP_INFO_WLOCK(ipi)     mtx_lock(&(ipi)->ipi_mtx)
  260 #define INP_INFO_RUNLOCK(ipi)   mtx_unlock(&(ipi)->ipi_mtx)
  261 #define INP_INFO_WUNLOCK(ipi)   mtx_unlock(&(ipi)->ipi_mtx)
  262 
  263 #define INP_PCBHASH(faddr, lport, fport, mask) \
  264         (((faddr) ^ ((faddr) >> 16) ^ ntohs((lport) ^ (fport))) & (mask))
  265 #define INP_PCBPORTHASH(lport, mask) \
  266         (ntohs((lport)) & (mask))
  267 
  268 /* flags in inp_flags: */
  269 #define INP_RECVOPTS            0x01    /* receive incoming IP options */
  270 #define INP_RECVRETOPTS         0x02    /* receive IP options for reply */
  271 #define INP_RECVDSTADDR         0x04    /* receive IP dst address */
  272 #define INP_HDRINCL             0x08    /* user supplies entire IP header */
  273 #define INP_HIGHPORT            0x10    /* user wants "high" port binding */
  274 #define INP_LOWPORT             0x20    /* user wants "low" port binding */
  275 #define INP_ANONPORT            0x40    /* port chosen for user */
  276 #define INP_RECVIF              0x80    /* receive incoming interface */
  277 #define INP_MTUDISC             0x100   /* user can do MTU discovery */
  278 #define INP_FAITH               0x200   /* accept FAITH'ed connections */
  279 #define INP_RECVTTL             0x400   /* receive incoming IP TTL */
  280 
  281 #define IN6P_IPV6_V6ONLY        0x008000 /* restrict AF_INET6 socket for v6 */
  282 
  283 #define IN6P_PKTINFO            0x010000 /* receive IP6 dst and I/F */
  284 #define IN6P_HOPLIMIT           0x020000 /* receive hoplimit */
  285 #define IN6P_HOPOPTS            0x040000 /* receive hop-by-hop options */
  286 #define IN6P_DSTOPTS            0x080000 /* receive dst options after rthdr */
  287 #define IN6P_RTHDR              0x100000 /* receive routing header */
  288 #define IN6P_RTHDRDSTOPTS       0x200000 /* receive dstoptions before rthdr */
  289 #define IN6P_AUTOFLOWLABEL      0x800000 /* attach flowlabel automatically */
  290 
  291 #define INP_CONTROLOPTS         (INP_RECVOPTS|INP_RECVRETOPTS|INP_RECVDSTADDR|\
  292                                  INP_RECVIF|INP_RECVTTL|\
  293                                  IN6P_PKTINFO|IN6P_HOPLIMIT|IN6P_HOPOPTS|\
  294                                  IN6P_DSTOPTS|IN6P_RTHDR|IN6P_RTHDRDSTOPTS|\
  295                                  IN6P_AUTOFLOWLABEL)
  296 #define INP_UNMAPPABLEOPTS      (IN6P_HOPOPTS|IN6P_DSTOPTS|IN6P_RTHDR|\
  297                                  IN6P_AUTOFLOWLABEL)
  298 
  299  /* for KAME src sync over BSD*'s */
  300 #define IN6P_HIGHPORT           INP_HIGHPORT
  301 #define IN6P_LOWPORT            INP_LOWPORT
  302 #define IN6P_ANONPORT           INP_ANONPORT
  303 #define IN6P_RECVIF             INP_RECVIF
  304 #define IN6P_MTUDISC            INP_MTUDISC
  305 #define IN6P_FAITH              INP_FAITH
  306 #define IN6P_CONTROLOPTS INP_CONTROLOPTS
  307         /*
  308          * socket AF version is {newer than,or include}
  309          * actual datagram AF version
  310          */
  311 
  312 #define INPLOOKUP_WILDCARD      1
  313 #define sotoinpcb(so)   ((struct inpcb *)(so)->so_pcb)
  314 #define sotoin6pcb(so)  sotoinpcb(so) /* for KAME src sync over BSD*'s */
  315 
  316 #define INP_SOCKAF(so) so->so_proto->pr_domain->dom_family
  317 
  318 #define INP_CHECK_SOCKAF(so, af)        (INP_SOCKAF(so) == af)
  319 
  320 #ifdef _KERNEL
  321 extern int      ipport_lowfirstauto;
  322 extern int      ipport_lowlastauto;
  323 extern int      ipport_firstauto;
  324 extern int      ipport_lastauto;
  325 extern int      ipport_hifirstauto;
  326 extern int      ipport_hilastauto;
  327 
  328 void    in_pcbpurgeif0(struct inpcbinfo *, struct ifnet *);
  329 void    in_losing(struct inpcb *);
  330 struct inpcb *
  331         in_rtchange(struct inpcb *, int);
  332 int     in_pcballoc(struct socket *, struct inpcbinfo *, struct thread *);
  333 int     in_pcbbind(struct inpcb *, struct sockaddr *, struct thread *);
  334 int     in_pcbbind_setup(struct inpcb *, struct sockaddr *, in_addr_t *,
  335             u_short *, struct thread *);
  336 int     in_pcbconnect(struct inpcb *, struct sockaddr *, struct thread *);
  337 int     in_pcbconnect_setup(struct inpcb *, struct sockaddr *, in_addr_t *,
  338             u_short *, in_addr_t *, u_short *, struct inpcb **,
  339             struct thread *);
  340 void    in_pcbdetach(struct inpcb *);
  341 void    in_pcbdisconnect(struct inpcb *);
  342 int     in_pcbinshash(struct inpcb *);
  343 struct inpcb *
  344         in_pcblookup_local(struct inpcbinfo *,
  345             struct in_addr, u_int, int);
  346 struct inpcb *
  347         in_pcblookup_hash(struct inpcbinfo *, struct in_addr, u_int,
  348             struct in_addr, u_int, int, struct ifnet *);
  349 void    in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr,
  350             int, struct inpcb *(*)(struct inpcb *, int));
  351 void    in_pcbrehash(struct inpcb *);
  352 int     in_setpeeraddr(struct socket *so, struct sockaddr **nam, struct inpcbinfo *pcbinfo);
  353 int     in_setsockaddr(struct socket *so, struct sockaddr **nam, struct inpcbinfo *pcbinfo);;
  354 struct sockaddr *
  355         in_sockaddr(in_port_t port, struct in_addr *addr);
  356 void    in_pcbremlists(struct inpcb *inp);
  357 int     prison_xinpcb(struct thread *td, struct inpcb *inp);
  358 #endif /* _KERNEL */
  359 
  360 #endif /* !_NETINET_IN_PCB_H_ */

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