bsd/netinet/in_var.h

   1 /*
   2  * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1985, 1986, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)in_var.h    8.2 (Berkeley) 1/9/95
  61  * $FreeBSD: src/sys/netinet/in_var.h,v 1.33.2.2 2001/07/17 10:50:01 ru Exp $
  62  */
  63
  64 #ifndef _NETINET_IN_VAR_H_
  65 #define _NETINET_IN_VAR_H_
  66 #include <sys/appleapiopts.h>
  67
  68 #include <sys/queue.h>
  69 #ifdef __APPLE__
  70 #include <sys/kern_event.h>
  71 #endif
  72
  73 #ifdef PRIVATE
  74 #include <net/route.h>
  75
  76 /*
  77  * Interface address, Internet version.  One of these structures
  78  * is allocated for each Internet address on an interface.
  79  * The ifaddr structure contains the protocol-independent part
  80  * of the structure and is assumed to be first.
  81  */
  82 struct in_ifaddr {
  83         struct ifaddr           ia_ifa;         /* protocol-independent info */
  84 #define ia_ifp                  ia_ifa.ifa_ifp
  85 #define ia_flags                ia_ifa.ifa_flags
  86                                                 /* ia_{,sub}net{,mask} in host order */
  87         u_long                  ia_net;         /* network number of interface */
  88         u_long                  ia_netmask;     /* mask of net part */
  89         u_long                  ia_subnet;      /* subnet number, including net */
  90         u_long                  ia_subnetmask;  /* mask of subnet part */
  91         struct in_addr          ia_netbroadcast; /* to recognize net broadcasts */
  92         TAILQ_ENTRY(in_ifaddr)  ia_link;        /* tailq macro glue */
  93         struct sockaddr_in      ia_addr;        /* reserve space for interface name */
  94         struct sockaddr_in      ia_dstaddr;     /* reserve space for broadcast addr */
  95 #define ia_broadaddr            ia_dstaddr
  96         struct sockaddr_in      ia_sockmask;    /* reserve space for general netmask */
  97 #if CONFIG_FORCE_OUT_IFP
  98         struct  rtentry         *ia_route; /* PDP context hack - a faux route we can use */
  99 #endif
 100 };
 101 #endif /* PRIVATE */
 102
 103 struct  in_aliasreq {
 104         char                    ifra_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 105         struct sockaddr_in      ifra_addr;
 106         struct sockaddr_in      ifra_broadaddr;
 107 #define ifra_dstaddr            ifra_broadaddr
 108         struct sockaddr_in      ifra_mask;
 109         u_int32_t               ifra_unused;    /* not used: used to be 'dlt' */
 110 };
 111
 112 /*
 113  * Event data, internet style.
 114  */
 115 struct kev_in_data {
 116         struct net_event_data   link_data;
 117         struct in_addr          ia_addr;
 118         u_int32_t               ia_net;         /* network number of interface */
 119         u_int32_t               ia_netmask;     /* mask of net part */
 120         u_int32_t               ia_subnet;      /* subnet number, including net */
 121         u_int32_t               ia_subnetmask;  /* mask of subnet part */
 122         struct in_addr          ia_netbroadcast;/* to recognize net broadcasts */
 123         struct in_addr          ia_dstaddr;
 124 };
 125
 126 struct kev_in_collision {
 127         struct net_event_data   link_data;      /* link colliding arp was received on */
 128         struct in_addr          ia_ipaddr;      /* IP address we and another node are using */
 129         u_char                  hw_len;         /* length of hardware address */
 130         u_char                  hw_addr[0];     /* variable length hardware address */
 131 };
 132
 133 #ifdef __APPLE_API_PRIVATE
 134 struct kev_in_portinuse {
 135         u_int16_t               port;           /* conflicting port number in host order */
 136         u_int32_t               req_pid;        /* PID port requestor */
 137         u_int32_t               reserved[2];
 138 };
 139 #endif
 140
 141
 142 /*
 143  * Define inet event subclass and specific inet events.
 144  */
 145
 146 #define KEV_INET_SUBCLASS 1
 147
 148 #define KEV_INET_NEW_ADDR     1
 149 #define KEV_INET_CHANGED_ADDR 2
 150 #define KEV_INET_ADDR_DELETED 3
 151 #define KEV_INET_SIFDSTADDR   4
 152 #define KEV_INET_SIFBRDADDR   5
 153 #define KEV_INET_SIFNETMASK   6
 154 #define KEV_INET_ARPCOLLISION 7 /* use kev_in_collision */
 155
 156 #ifdef __APPLE_API_PRIVATE
 157 #define KEV_INET_PORTINUSE    8 /* use ken_in_portinuse */
 158 #endif
 159
 160 #ifdef KERNEL_PRIVATE
 161 /*
 162  * Given a pointer to an in_ifaddr (ifaddr),
 163  * return a pointer to the addr as a sockaddr_in.
 164  */
 165 #define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))
 166 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
 167
 168 #define IN_LNAOF(in, ifa) \
 169         ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
 170
 171 extern  TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
 172 extern  struct  ifqueue ipintrq;                /* ip packet input queue */
 173 extern  struct  in_addr zeroin_addr;
 174 extern  u_char  inetctlerrmap[];
 175 extern  lck_mtx_t *rt_mtx;
 176
 177 extern int apple_hwcksum_tx;
 178 extern int apple_hwcksum_rx;
 179
 180 /*
 181  * Macro for finding the interface (ifnet structure) corresponding to one
 182  * of our IP addresses.
 183  */
 184 #define INADDR_TO_IFP(addr, ifp) \
 185         /* struct in_addr addr; */ \
 186         /* struct ifnet *ifp; */ \
 187 { \
 188         struct in_ifaddr *ia; \
 189 \
 190         lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_NOTOWNED); \
 191         lck_mtx_lock(rt_mtx); \
 192         TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) \
 193                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
 194                         break; \
 195         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
 196         lck_mtx_unlock(rt_mtx); \
 197 }
 198
 199 /*
 200  * Macro for finding the internet address structure (in_ifaddr) corresponding
 201  * to a given interface (ifnet structure).
 202  */
 203 #define IFP_TO_IA(ifp, ia) \
 204         /* struct ifnet *ifp; */ \
 205         /* struct in_ifaddr *ia; */ \
 206 { \
 207         lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_NOTOWNED); \
 208         lck_mtx_lock(rt_mtx); \
 209         for ((ia) = TAILQ_FIRST(&in_ifaddrhead); \
 210             (ia) != NULL && (ia)->ia_ifp != (ifp); \
 211             (ia) = TAILQ_NEXT((ia), ia_link)) \
 212                 continue; \
 213         lck_mtx_unlock(rt_mtx); \
 214 }
 215
 216 /*
 217  * This information should be part of the ifnet structure but we don't wish
 218  * to change that - as it might break a number of things
 219  */
 220
 221 struct router_info {
 222         struct ifnet *rti_ifp;
 223         int    rti_type; /* type of router which is querier on this interface */
 224         int    rti_time; /* # of slow timeouts since last old query */
 225         struct router_info *rti_next;
 226 };
 227
 228 /*
 229  * Internet multicast address structure.  There is one of these for each IP
 230  * multicast group to which this host belongs on a given network interface.
 231  * For every entry on the interface's if_multiaddrs list which represents
 232  * an IP multicast group, there is one of these structures.  They are also
 233  * kept on a system-wide list to make it easier to keep our legacy IGMP code
 234  * compatible with the rest of the world (see IN_FIRST_MULTI et al, below).
 235  */
 236 struct in_multi {
 237         LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
 238         struct  in_addr inm_addr;       /* IP multicast address, convenience */
 239         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
 240         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
 241         u_int   inm_timer;              /* IGMP membership report timer */
 242         u_int   inm_state;              /*  state of the membership */
 243         struct  router_info *inm_rti;   /* router info*/
 244 };
 245
 246 #ifdef SYSCTL_DECL
 247 SYSCTL_DECL(_net_inet_ip);
 248 SYSCTL_DECL(_net_inet_raw);
 249 #endif
 250
 251 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
 252
 253 /*
 254  * Structure used by macros below to remember position when stepping through
 255  * all of the in_multi records.
 256  */
 257 struct in_multistep {
 258         struct in_multi *i_inm;
 259 };
 260
 261 /*
 262  * Macro for looking up the in_multi record for a given IP multicast address
 263  * on a given interface.  If no matching record is found, "inm" is set null.
 264  */
 265 #define IN_LOOKUP_MULTI(addr, ifp, inm) \
 266         /* struct in_addr addr; */ \
 267         /* struct ifnet *ifp; */ \
 268         /* struct in_multi *inm; */ \
 269 do { \
 270         struct ifmultiaddr *ifma; \
 271 \
 272         LIST_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \
 273                 if (ifma->ifma_addr->sa_family == AF_INET \
 274                     && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \
 275                     (addr).s_addr) \
 276                         break; \
 277         } \
 278         (inm) = ifma ? ifma->ifma_protospec : NULL; \
 279 } while(0)
 280
 281 /*
 282  * Macro to step through all of the in_multi records, one at a time.
 283  * The current position is remembered in "step", which the caller must
 284  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
 285  * and get the first record.  Both macros return a NULL "inm" when there
 286  * are no remaining records.
 287  */
 288 #define IN_NEXT_MULTI(step, inm) \
 289         /* struct in_multistep  step; */ \
 290         /* struct in_multi *inm; */ \
 291 do { \
 292         if (((inm) = (step).i_inm) != NULL) \
 293                 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \
 294 } while(0)
 295
 296 #define IN_FIRST_MULTI(step, inm) \
 297         /* struct in_multistep step; */ \
 298         /* struct in_multi *inm; */ \
 299 do { \
 300         (step).i_inm = LIST_FIRST(&in_multihead); \
 301         IN_NEXT_MULTI((step), (inm)); \
 302 } while(0)
 303
 304 struct  route;
 305 struct  in_multi *in_addmulti(struct in_addr *, struct ifnet *);
 306 void    in_delmulti(struct in_multi **);
 307 int     in_control(struct socket *, u_long, caddr_t, struct ifnet *,
 308                         struct proc *);
 309 void    in_rtqdrain(void);
 310 void    ip_input(struct mbuf *);
 311 int     in_ifadown(struct ifaddr *ifa, int);
 312 void    in_ifscrub(struct ifnet *, struct in_ifaddr *, int);
 313 int     ipflow_fastforward(struct mbuf *);
 314 void    ipflow_create(const struct route *, struct mbuf *);
 315 void    ipflow_slowtimo(void);
 316
 317 #endif /* KERNEL_PRIVATE */
 318
 319 /* INET6 stuff */
 320 #include <netinet6/in6_var.h>
 321
 322 #endif /* _NETINET_IN_VAR_H_ */