sys/netinet/ip_mroute.h

   1 /*-
   2  * Copyright (c) 1989 Stephen Deering.
   3  * Copyright (c) 1992, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Stephen Deering of Stanford University.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  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  *      @(#)ip_mroute.h 8.1 (Berkeley) 6/10/93
  34  * $FreeBSD$
  35  */
  36
  37 #ifndef _NETINET_IP_MROUTE_H_
  38 #define _NETINET_IP_MROUTE_H_
  39
  40 /*
  41  * Definitions for IP multicast forwarding.
  42  *
  43  * Written by David Waitzman, BBN Labs, August 1988.
  44  * Modified by Steve Deering, Stanford, February 1989.
  45  * Modified by Ajit Thyagarajan, PARC, August 1993.
  46  * Modified by Ajit Thyagarajan, PARC, August 1994.
  47  * Modified by Ahmed Helmy, SGI, June 1996.
  48  * Modified by Pavlin Radoslavov, ICSI, October 2002.
  49  *
  50  * MROUTING Revision: 3.3.1.3
  51  * and PIM-SMv2 and PIM-DM support, advanced API support,
  52  * bandwidth metering and signaling.
  53  */
  54
  55
  56 /*
  57  * Multicast Routing set/getsockopt commands.
  58  */
  59 #define MRT_INIT        100     /* initialize forwarder */
  60 #define MRT_DONE        101     /* shut down forwarder */
  61 #define MRT_ADD_VIF     102     /* create virtual interface */
  62 #define MRT_DEL_VIF     103     /* delete virtual interface */
  63 #define MRT_ADD_MFC     104     /* insert forwarding cache entry */
  64 #define MRT_DEL_MFC     105     /* delete forwarding cache entry */
  65 #define MRT_VERSION     106     /* get kernel version number */
  66 #define MRT_ASSERT      107     /* enable assert processing */
  67 #define MRT_PIM         MRT_ASSERT /* enable PIM processing */
  68 #define MRT_API_SUPPORT 109     /* supported MRT API */
  69 #define MRT_API_CONFIG  110     /* config MRT API */
  70 #define MRT_ADD_BW_UPCALL 111   /* create bandwidth monitor */
  71 #define MRT_DEL_BW_UPCALL 112   /* delete bandwidth monitor */
  72
  73
  74 #define GET_TIME(t)     microtime(&t)
  75
  76 /*
  77  * Types and macros for handling bitmaps with one bit per virtual interface.
  78  */
  79 #define MAXVIFS 32
  80 typedef u_long vifbitmap_t;
  81 typedef u_short vifi_t;         /* type of a vif index */
  82 #define ALL_VIFS (vifi_t)-1
  83
  84 #define VIFM_SET(n, m)          ((m) |= (1 << (n)))
  85 #define VIFM_CLR(n, m)          ((m) &= ~(1 << (n)))
  86 #define VIFM_ISSET(n, m)        ((m) & (1 << (n)))
  87 #define VIFM_CLRALL(m)          ((m) = 0x00000000)
  88 #define VIFM_COPY(mfrom, mto)   ((mto) = (mfrom))
  89 #define VIFM_SAME(m1, m2)       ((m1) == (m2))
  90
  91
  92 /*
  93  * Argument structure for MRT_ADD_VIF.
  94  * (MRT_DEL_VIF takes a single vifi_t argument.)
  95  */
  96 struct vifctl {
  97         vifi_t  vifc_vifi;              /* the index of the vif to be added */
  98         u_char  vifc_flags;             /* VIFF_ flags defined below */
  99         u_char  vifc_threshold;         /* min ttl required to forward on vif */
 100         u_int   vifc_rate_limit;        /* max rate */
 101         struct  in_addr vifc_lcl_addr;  /* local interface address */
 102         struct  in_addr vifc_rmt_addr;  /* remote address (tunnels only) */
 103 };
 104
 105 #define VIFF_TUNNEL     0x1             /* no-op; retained for old source */
 106 #define VIFF_SRCRT      0x2             /* no-op; retained for old source */
 107 #define VIFF_REGISTER   0x4             /* used for PIM Register encap/decap */
 108
 109 /*
 110  * Argument structure for MRT_ADD_MFC and MRT_DEL_MFC
 111  * XXX if you change this, make sure to change struct mfcctl2 as well.
 112  */
 113 struct mfcctl {
 114     struct in_addr  mfcc_origin;                /* ip origin of mcasts       */
 115     struct in_addr  mfcc_mcastgrp;              /* multicast group associated*/
 116     vifi_t          mfcc_parent;                /* incoming vif              */
 117     u_char          mfcc_ttls[MAXVIFS];         /* forwarding ttls on vifs   */
 118 };
 119
 120 /*
 121  * The new argument structure for MRT_ADD_MFC and MRT_DEL_MFC overlays
 122  * and extends the old struct mfcctl.
 123  */
 124 struct mfcctl2 {
 125         /* the mfcctl fields */
 126         struct in_addr  mfcc_origin;            /* ip origin of mcasts       */
 127         struct in_addr  mfcc_mcastgrp;          /* multicast group associated*/
 128         vifi_t          mfcc_parent;            /* incoming vif              */
 129         u_char          mfcc_ttls[MAXVIFS];     /* forwarding ttls on vifs   */
 130
 131         /* extension fields */
 132         uint8_t         mfcc_flags[MAXVIFS];    /* the MRT_MFC_FLAGS_* flags */
 133         struct in_addr  mfcc_rp;                /* the RP address            */
 134 };
 135 /*
 136  * The advanced-API flags.
 137  *
 138  * The MRT_MFC_FLAGS_XXX API flags are also used as flags
 139  * for the mfcc_flags field.
 140  */
 141 #define MRT_MFC_FLAGS_DISABLE_WRONGVIF  (1 << 0) /* disable WRONGVIF signals */
 142 #define MRT_MFC_FLAGS_BORDER_VIF        (1 << 1) /* border vif               */
 143 #define MRT_MFC_RP                      (1 << 8) /* enable RP address        */
 144 #define MRT_MFC_BW_UPCALL               (1 << 9) /* enable bw upcalls        */
 145 #define MRT_MFC_FLAGS_ALL               (MRT_MFC_FLAGS_DISABLE_WRONGVIF |    \
 146                                          MRT_MFC_FLAGS_BORDER_VIF)
 147 #define MRT_API_FLAGS_ALL               (MRT_MFC_FLAGS_ALL |                 \
 148                                          MRT_MFC_RP |                        \
 149                                          MRT_MFC_BW_UPCALL)
 150
 151 /*
 152  * Structure for installing or delivering an upcall if the
 153  * measured bandwidth is above or below a threshold.
 154  *
 155  * User programs (e.g. daemons) may have a need to know when the
 156  * bandwidth used by some data flow is above or below some threshold.
 157  * This interface allows the userland to specify the threshold (in
 158  * bytes and/or packets) and the measurement interval. Flows are
 159  * all packet with the same source and destination IP address.
 160  * At the moment the code is only used for multicast destinations
 161  * but there is nothing that prevents its use for unicast.
 162  *
 163  * The measurement interval cannot be shorter than some Tmin (currently, 3s).
 164  * The threshold is set in packets and/or bytes per_interval.
 165  *
 166  * Measurement works as follows:
 167  *
 168  * For >= measurements:
 169  * The first packet marks the start of a measurement interval.
 170  * During an interval we count packets and bytes, and when we
 171  * pass the threshold we deliver an upcall and we are done.
 172  * The first packet after the end of the interval resets the
 173  * count and restarts the measurement.
 174  *
 175  * For <= measurement:
 176  * We start a timer to fire at the end of the interval, and
 177  * then for each incoming packet we count packets and bytes.
 178  * When the timer fires, we compare the value with the threshold,
 179  * schedule an upcall if we are below, and restart the measurement
 180  * (reschedule timer and zero counters).
 181  */
 182
 183 struct bw_data {
 184         struct timeval  b_time;
 185         uint64_t        b_packets;
 186         uint64_t        b_bytes;
 187 };
 188
 189 struct bw_upcall {
 190         struct in_addr  bu_src;                 /* source address            */
 191         struct in_addr  bu_dst;                 /* destination address       */
 192         uint32_t        bu_flags;               /* misc flags (see below)    */
 193 #define BW_UPCALL_UNIT_PACKETS   (1 << 0)       /* threshold (in packets)    */
 194 #define BW_UPCALL_UNIT_BYTES     (1 << 1)       /* threshold (in bytes)      */
 195 #define BW_UPCALL_GEQ            (1 << 2)       /* upcall if bw >= threshold */
 196 #define BW_UPCALL_LEQ            (1 << 3)       /* upcall if bw <= threshold */
 197 #define BW_UPCALL_DELETE_ALL     (1 << 4)       /* delete all upcalls for s,d*/
 198         struct bw_data  bu_threshold;           /* the bw threshold          */
 199         struct bw_data  bu_measured;            /* the measured bw           */
 200 };
 201
 202 /* max. number of upcalls to deliver together */
 203 #define BW_UPCALLS_MAX                          128
 204 /* min. threshold time interval for bandwidth measurement */
 205 #define BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC    3
 206 #define BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC   0
 207
 208 /*
 209  * The kernel's multicast routing statistics.
 210  */
 211 struct mrtstat {
 212     u_long      mrts_mfc_lookups;       /* # forw. cache hash table hits   */
 213     u_long      mrts_mfc_misses;        /* # forw. cache hash table misses */
 214     u_long      mrts_upcalls;           /* # calls to multicast routing daemon */
 215     u_long      mrts_no_route;          /* no route for packet's origin    */
 216     u_long      mrts_bad_tunnel;        /* malformed tunnel options        */
 217     u_long      mrts_cant_tunnel;       /* no room for tunnel options      */
 218     u_long      mrts_wrong_if;          /* arrived on wrong interface      */
 219     u_long      mrts_upq_ovflw;         /* upcall Q overflow               */
 220     u_long      mrts_cache_cleanups;    /* # entries with no upcalls       */
 221     u_long      mrts_drop_sel;          /* pkts dropped selectively        */
 222     u_long      mrts_q_overflow;        /* pkts dropped - Q overflow       */
 223     u_long      mrts_pkt2large;         /* pkts dropped - size > BKT SIZE  */
 224     u_long      mrts_upq_sockfull;      /* upcalls dropped - socket full */
 225 };
 226
 227 /*
 228  * Argument structure used by mrouted to get src-grp pkt counts
 229  */
 230 struct sioc_sg_req {
 231     struct in_addr src;
 232     struct in_addr grp;
 233     u_long pktcnt;
 234     u_long bytecnt;
 235     u_long wrong_if;
 236 };
 237
 238 /*
 239  * Argument structure used by mrouted to get vif pkt counts
 240  */
 241 struct sioc_vif_req {
 242     vifi_t vifi;                /* vif number                           */
 243     u_long icount;              /* Input packet count on vif            */
 244     u_long ocount;              /* Output packet count on vif           */
 245     u_long ibytes;              /* Input byte count on vif              */
 246     u_long obytes;              /* Output byte count on vif             */
 247 };
 248
 249
 250 /*
 251  * The kernel's virtual-interface structure.
 252  */
 253 struct vif {
 254     u_char              v_flags;        /* VIFF_ flags defined above         */
 255     u_char              v_threshold;    /* min ttl required to forward on vif*/
 256     u_int               v_rate_limit;   /* ignored; kept for compatibility */
 257     struct tbf         *v_tbf;          /* ignored; kept for compatibility */
 258     struct in_addr      v_lcl_addr;     /* local interface address           */
 259     struct in_addr      v_rmt_addr;     /* remote address (tunnels only)     */
 260     struct ifnet       *v_ifp;          /* pointer to interface              */
 261     u_long              v_pkt_in;       /* # pkts in on interface            */
 262     u_long              v_pkt_out;      /* # pkts out on interface           */
 263     u_long              v_bytes_in;     /* # bytes in on interface           */
 264     u_long              v_bytes_out;    /* # bytes out on interface          */
 265     struct route        v_route;        /* cached route */
 266     u_int               v_rsvp_on;      /* RSVP listening on this vif */
 267     struct socket      *v_rsvpd;        /* RSVP daemon socket */
 268 };
 269
 270 /*
 271  * The kernel's multicast forwarding cache entry structure
 272  * (A field for the type of service (mfc_tos) is to be added
 273  * at a future point)
 274  */
 275 struct mfc {
 276         struct in_addr  mfc_origin;             /* IP origin of mcasts       */
 277         struct in_addr  mfc_mcastgrp;           /* multicast group associated*/
 278         vifi_t          mfc_parent;             /* incoming vif              */
 279         u_char          mfc_ttls[MAXVIFS];      /* forwarding ttls on vifs   */
 280         u_long          mfc_pkt_cnt;            /* pkt count for src-grp     */
 281         u_long          mfc_byte_cnt;           /* byte count for src-grp    */
 282         u_long          mfc_wrong_if;           /* wrong if for src-grp      */
 283         int             mfc_expire;             /* time to clean entry up    */
 284         struct timeval  mfc_last_assert;        /* last time I sent an assert*/
 285         struct rtdetq   *mfc_stall;             /* q of packets awaiting mfc */
 286         struct mfc      *mfc_next;              /* next mfc entry            */
 287         uint8_t         mfc_flags[MAXVIFS];     /* the MRT_MFC_FLAGS_* flags */
 288         struct in_addr  mfc_rp;                 /* the RP address            */
 289         struct bw_meter *mfc_bw_meter;          /* list of bandwidth meters  */
 290 };
 291
 292 /*
 293  * Struct used to communicate from kernel to multicast router
 294  * note the convenient similarity to an IP packet
 295  */
 296 struct igmpmsg {
 297     uint32_t        unused1;
 298     uint32_t        unused2;
 299     u_char          im_msgtype;                 /* what type of message     */
 300 #define IGMPMSG_NOCACHE         1       /* no MFC in the kernel             */
 301 #define IGMPMSG_WRONGVIF        2       /* packet came from wrong interface */
 302 #define IGMPMSG_WHOLEPKT        3       /* PIM pkt for user level encap.    */
 303 #define IGMPMSG_BW_UPCALL       4       /* BW monitoring upcall             */
 304     u_char          im_mbz;                     /* must be zero             */
 305     u_char          im_vif;                     /* vif rec'd on             */
 306     u_char          unused3;
 307     struct in_addr  im_src, im_dst;
 308 };
 309
 310 /*
 311  * Argument structure used for pkt info. while upcall is made
 312  */
 313 struct rtdetq {
 314     struct mbuf         *m;             /* A copy of the packet             */
 315     struct ifnet        *ifp;           /* Interface pkt came in on         */
 316     vifi_t              xmt_vif;        /* Saved copy of imo_multicast_vif  */
 317     struct rtdetq       *next;          /* Next in list of packets          */
 318 };
 319
 320 #define MFCTBLSIZ       256
 321 #if (MFCTBLSIZ & (MFCTBLSIZ - 1)) == 0    /* from sys:route.h */
 322 #define MFCHASHMOD(h)   ((h) & (MFCTBLSIZ - 1))
 323 #else
 324 #define MFCHASHMOD(h)   ((h) % MFCTBLSIZ)
 325 #endif
 326
 327 #define MAX_UPQ 4               /* max. no of pkts in upcall Q */
 328
 329 /*
 330  * Structure for measuring the bandwidth and sending an upcall if the
 331  * measured bandwidth is above or below a threshold.
 332  */
 333 struct bw_meter {
 334         struct bw_meter *bm_mfc_next;           /* next bw meter (same mfc)  */
 335         struct bw_meter *bm_time_next;          /* next bw meter (same time) */
 336         uint32_t        bm_time_hash;           /* the time hash value       */
 337         struct mfc      *bm_mfc;                /* the corresponding mfc     */
 338         uint32_t        bm_flags;               /* misc flags (see below)    */
 339 #define BW_METER_UNIT_PACKETS   (1 << 0)        /* threshold (in packets)    */
 340 #define BW_METER_UNIT_BYTES     (1 << 1)        /* threshold (in bytes)      */
 341 #define BW_METER_GEQ            (1 << 2)        /* upcall if bw >= threshold */
 342 #define BW_METER_LEQ            (1 << 3)        /* upcall if bw <= threshold */
 343 #define BW_METER_USER_FLAGS     (BW_METER_UNIT_PACKETS |                \
 344                                  BW_METER_UNIT_BYTES |                  \
 345                                  BW_METER_GEQ |                         \
 346                                  BW_METER_LEQ)
 347
 348 #define BW_METER_UPCALL_DELIVERED (1 << 24)     /* upcall was delivered      */
 349
 350         struct bw_data  bm_threshold;           /* the upcall threshold      */
 351         struct bw_data  bm_measured;            /* the measured bw           */
 352         struct timeval  bm_start_time;          /* abs. time                 */
 353 };
 354
 355 #ifdef _KERNEL
 356
 357 struct sockopt;
 358
 359 extern int      (*ip_mrouter_set)(struct socket *, struct sockopt *);
 360 extern int      (*ip_mrouter_get)(struct socket *, struct sockopt *);
 361 extern int      (*ip_mrouter_done)(void);
 362 extern int      (*mrt_ioctl)(int, caddr_t, int);
 363
 364 #endif /* _KERNEL */
 365
 366 #endif /* _NETINET_IP_MROUTE_H_ */