sys/netinet/ip_mroute.h

   1 /*      $NetBSD: ip_mroute.h,v 1.31 2008/08/07 06:20:14 cegger Exp $    */
   2
   3 #ifndef _NETINET_IP_MROUTE_H_
   4 #define _NETINET_IP_MROUTE_H_
   5
   6 /*
   7  * Definitions for IP multicast forwarding.
   8  *
   9  * Written by David Waitzman, BBN Labs, August 1988.
  10  * Modified by Steve Deering, Stanford, February 1989.
  11  * Modified by Ajit Thyagarajan, PARC, August 1993.
  12  * Modified by Ajit Thyagarajan, PARC, August 1994.
  13  * Modified by Ahmed Helmy, SGI, June 1996.
  14  * Modified by Pavlin Radoslavov, ICSI, October 2002.
  15  *
  16  * MROUTING Revision: 1.2
  17  * and PIM-SMv2 and PIM-DM support, advanced API support,
  18  * bandwidth metering and signaling.
  19  */
  20
  21 #include <sys/queue.h>
  22 #include <sys/callout.h>
  23
  24 #ifdef _KERNEL
  25 struct sockopt; /* from <sys/socketvar.h> */
  26 #endif
  27
  28 /*
  29  * Multicast Routing set/getsockopt commands.
  30  */
  31 #define MRT_INIT                100     /* initialize forwarder */
  32 #define MRT_DONE                101     /* shut down forwarder */
  33 #define MRT_ADD_VIF             102     /* create virtual interface */
  34 #define MRT_DEL_VIF             103     /* delete virtual interface */
  35 #define MRT_ADD_MFC             104     /* insert forwarding cache entry */
  36 #define MRT_DEL_MFC             105     /* delete forwarding cache entry */
  37 #define MRT_VERSION             106     /* get kernel version number */
  38 #define MRT_ASSERT              107     /* enable assert processing */
  39 #define MRT_PIM                 MRT_ASSERT /* enable PIM processing */
  40 #define MRT_API_SUPPORT         109     /* supported MRT API */
  41 #define MRT_API_CONFIG          110     /* config MRT API */
  42 #define MRT_ADD_BW_UPCALL       111     /* create bandwidth monitor */
  43 #define MRT_DEL_BW_UPCALL       112     /* delete bandwidth monitor */
  44
  45
  46 /*
  47  * Types and macros for handling bitmaps with one bit per virtual interface.
  48  */
  49 #define MAXVIFS 32
  50 typedef u_int32_t vifbitmap_t;
  51 typedef u_int16_t vifi_t;               /* type of a vif index */
  52
  53 #define VIFM_SET(n, m)                  ((m) |= (1 << (n)))
  54 #define VIFM_CLR(n, m)                  ((m) &= ~(1 << (n)))
  55 #define VIFM_ISSET(n, m)                ((m) & (1 << (n)))
  56 #define VIFM_SETALL(m)                  ((m) = 0xffffffff)
  57 #define VIFM_CLRALL(m)                  ((m) = 0x00000000)
  58 #define VIFM_COPY(mfrom, mto)           ((mto) = (mfrom))
  59 #define VIFM_SAME(m1, m2)               ((m1) == (m2))
  60
  61 #define VIFF_TUNNEL     0x1             /* vif represents a tunnel end-point */
  62 #define VIFF_SRCRT      0x2             /* tunnel uses IP src routing */
  63 #define VIFF_REGISTER   0x4             /* used for PIM Register encap/decap */
  64
  65 /*
  66  * Argument structure for MRT_ADD_VIF.
  67  * (MRT_DEL_VIF takes a single vifi_t argument.)
  68  */
  69 struct vifctl {
  70         vifi_t    vifc_vifi;            /* the index of the vif to be added */
  71         u_int8_t  vifc_flags;           /* VIFF_ flags defined below */
  72         u_int8_t  vifc_threshold;       /* min ttl required to forward on vif */
  73         u_int32_t vifc_rate_limit;      /* max rate */
  74         struct    in_addr vifc_lcl_addr;/* local interface address */
  75         struct    in_addr vifc_rmt_addr;/* remote address (tunnels only) */
  76 };
  77
  78 /*
  79  * Argument structure for MRT_ADD_MFC and MRT_DEL_MFC.
  80  * XXX if you change this, make sure to change struct mfcctl2 as well.
  81  */
  82 struct mfcctl {
  83         struct   in_addr mfcc_origin;   /* ip origin of mcasts */
  84         struct   in_addr mfcc_mcastgrp; /* multicast group associated */
  85         vifi_t   mfcc_parent;           /* incoming vif */
  86         u_int8_t mfcc_ttls[MAXVIFS];    /* forwarding ttls on vifs */
  87 };
  88
  89 /*
  90  * The new argument structure for MRT_ADD_MFC and MRT_DEL_MFC overlays
  91  * and extends the old struct mfcctl.
  92  */
  93 struct mfcctl2 {
  94         /* the mfcctl fields */
  95         struct in_addr  mfcc_origin;            /* ip origin of mcasts       */
  96         struct in_addr  mfcc_mcastgrp;          /* multicast group associated*/
  97         vifi_t          mfcc_parent;            /* incoming vif              */
  98         u_int8_t        mfcc_ttls[MAXVIFS];     /* forwarding ttls on vifs   */
  99
 100         /* extension fields */
 101         u_int8_t        mfcc_flags[MAXVIFS];    /* the MRT_MFC_FLAGS_* flags */
 102         struct in_addr  mfcc_rp;                /* the RP address            */
 103 };
 104 /*
 105  * The advanced-API flags.
 106  *
 107  * The MRT_MFC_FLAGS_XXX API flags are also used as flags
 108  * for the mfcc_flags field.
 109  */
 110 #define MRT_MFC_FLAGS_DISABLE_WRONGVIF  (1 << 0) /* disable WRONGVIF signals */
 111 #define MRT_MFC_FLAGS_BORDER_VIF        (1 << 1) /* border vif               */
 112 #define MRT_MFC_RP                      (1 << 8) /* enable RP address        */
 113 #define MRT_MFC_BW_UPCALL               (1 << 9) /* enable bw upcalls        */
 114 #define MRT_MFC_FLAGS_ALL               (MRT_MFC_FLAGS_DISABLE_WRONGVIF |    \
 115                                          MRT_MFC_FLAGS_BORDER_VIF)
 116 #define MRT_API_FLAGS_ALL               (MRT_MFC_FLAGS_ALL |                 \
 117                                          MRT_MFC_RP |                        \
 118                                          MRT_MFC_BW_UPCALL)
 119
 120 /*
 121  * Structure for installing or delivering an upcall if the
 122  * measured bandwidth is above or below a threshold.
 123  *
 124  * User programs (e.g. daemons) may have a need to know when the
 125  * bandwidth used by some data flow is above or below some threshold.
 126  * This interface allows the userland to specify the threshold (in
 127  * bytes and/or packets) and the measurement interval. Flows are
 128  * all packet with the same source and destination IP address.
 129  * At the moment the code is only used for multicast destinations
 130  * but there is nothing that prevents its use for unicast.
 131  *
 132  * The measurement interval cannot be shorter than some Tmin (currently, 3s).
 133  * The threshold is set in packets and/or bytes per_interval.
 134  *
 135  * Measurement works as follows:
 136  *
 137  * For >= measurements:
 138  * The first packet marks the start of a measurement interval.
 139  * During an interval we count packets and bytes, and when we
 140  * pass the threshold we deliver an upcall and we are done.
 141  * The first packet after the end of the interval resets the
 142  * count and restarts the measurement.
 143  *
 144  * For <= measurement:
 145  * We start a timer to fire at the end of the interval, and
 146  * then for each incoming packet we count packets and bytes.
 147  * When the timer fires, we compare the value with the threshold,
 148  * schedule an upcall if we are below, and restart the measurement
 149  * (reschedule timer and zero counters).
 150  */
 151
 152 struct bw_data {
 153         struct timeval  b_time;
 154         u_int64_t       b_packets;
 155         u_int64_t       b_bytes;
 156 };
 157
 158 struct bw_upcall {
 159         struct in_addr  bu_src;                 /* source address            */
 160         struct in_addr  bu_dst;                 /* destination address       */
 161         u_int32_t       bu_flags;               /* misc flags (see below)    */
 162 #define BW_UPCALL_UNIT_PACKETS   (1 << 0)       /* threshold (in packets)    */
 163 #define BW_UPCALL_UNIT_BYTES     (1 << 1)       /* threshold (in bytes)      */
 164 #define BW_UPCALL_GEQ            (1 << 2)       /* upcall if bw >= threshold */
 165 #define BW_UPCALL_LEQ            (1 << 3)       /* upcall if bw <= threshold */
 166 #define BW_UPCALL_DELETE_ALL     (1 << 4)       /* delete all upcalls for s,d*/
 167         struct bw_data  bu_threshold;           /* the bw threshold          */
 168         struct bw_data  bu_measured;            /* the measured bw           */
 169 };
 170
 171 /* max. number of upcalls to deliver together */
 172 #define BW_UPCALLS_MAX                          128
 173 /* min. threshold time interval for bandwidth measurement */
 174 #define BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC    3
 175 #define BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC   0
 176
 177 /*
 178  * Argument structure used by mrouted to get src-grp pkt counts.
 179  */
 180 struct sioc_sg_req {
 181         struct  in_addr src;
 182         struct  in_addr grp;
 183         u_long  pktcnt;
 184         u_long  bytecnt;
 185         u_long  wrong_if;
 186 };
 187
 188 /*
 189  * Argument structure used by mrouted to get vif pkt counts.
 190  */
 191 struct sioc_vif_req {
 192         vifi_t  vifi;                   /* vif number */
 193         u_long  icount;                 /* input packet count on vif */
 194         u_long  ocount;                 /* output packet count on vif */
 195         u_long  ibytes;                 /* input byte count on vif */
 196         u_long  obytes;                 /* output byte count on vif */
 197 };
 198
 199
 200 /*
 201  * The kernel's multicast routing statistics.
 202  */
 203 struct mrtstat {
 204         u_long  mrts_mfc_lookups;       /* # forw. cache hash table hits */
 205         u_long  mrts_mfc_misses;        /* # forw. cache hash table misses */
 206         u_long  mrts_upcalls;           /* # calls to mrouted */
 207         u_long  mrts_no_route;          /* no route for packet's origin */
 208         u_long  mrts_bad_tunnel;        /* malformed tunnel options */
 209         u_long  mrts_cant_tunnel;       /* no room for tunnel options */
 210         u_long  mrts_wrong_if;          /* arrived on wrong interface */
 211         u_long  mrts_upq_ovflw;         /* upcall Q overflow */
 212         u_long  mrts_cache_cleanups;    /* # entries with no upcalls */
 213         u_long  mrts_drop_sel;          /* pkts dropped selectively */
 214         u_long  mrts_q_overflow;        /* pkts dropped - Q overflow */
 215         u_long  mrts_pkt2large;         /* pkts dropped - size > BKT SIZE */
 216         u_long  mrts_upq_sockfull;      /* upcalls dropped - socket full */
 217 };
 218
 219
 220 #ifdef _KERNEL
 221
 222 /*
 223  * The kernel's virtual-interface structure.
 224  */
 225 struct encaptab;
 226 struct vif {
 227         struct    mbuf *tbf_q, **tbf_t; /* packet queue */
 228         struct    timeval tbf_last_pkt_t; /* arr. time of last pkt */
 229         u_int32_t tbf_n_tok;            /* no of tokens in bucket */
 230         u_int32_t tbf_q_len;            /* length of queue at this vif */
 231         u_int32_t tbf_max_q_len;        /* max. queue length */
 232
 233         u_int8_t  v_flags;              /* VIFF_ flags defined above */
 234         u_int8_t  v_threshold;          /* min ttl required to forward on vif */
 235         u_int32_t v_rate_limit;         /* max rate */
 236         struct    in_addr v_lcl_addr;   /* local interface address */
 237         struct    in_addr v_rmt_addr;   /* remote address (tunnels only) */
 238         struct    ifnet *v_ifp;         /* pointer to interface */
 239         u_long    v_pkt_in;             /* # pkts in on interface */
 240         u_long    v_pkt_out;            /* # pkts out on interface */
 241         u_long    v_bytes_in;           /* # bytes in on interface */
 242         u_long    v_bytes_out;          /* # bytes out on interface */
 243         struct    route v_route;        /* cached route if this is a tunnel */
 244         callout_t v_repq_ch;            /* for tbf_reprocess_q() */
 245 #ifdef RSVP_ISI
 246         int       v_rsvp_on;            /* # RSVP listening on this vif */
 247         struct    socket *v_rsvpd;      /* # RSVPD daemon */
 248 #endif /* RSVP_ISI */
 249         const struct encaptab *v_encap_cookie;
 250 };
 251
 252 /*
 253  * The kernel's multicast forwarding cache entry structure.
 254  * (A field for the type of service (mfc_tos) is to be added
 255  * at a future point.)
 256  */
 257 struct mfc {
 258         LIST_ENTRY(mfc) mfc_hash;
 259         struct   in_addr mfc_origin;            /* ip origin of mcasts */
 260         struct   in_addr mfc_mcastgrp;          /* multicast group associated */
 261         vifi_t   mfc_parent;                    /* incoming vif */
 262         u_int8_t mfc_ttls[MAXVIFS];             /* forwarding ttls on vifs */
 263         u_long   mfc_pkt_cnt;                   /* pkt count for src-grp */
 264         u_long   mfc_byte_cnt;                  /* byte count for src-grp */
 265         u_long   mfc_wrong_if;                  /* wrong if for src-grp */
 266         int      mfc_expire;                    /* time to clean entry up */
 267         struct   timeval mfc_last_assert;       /* last time I sent an assert */
 268         struct   rtdetq *mfc_stall;             /* pkts waiting for route */
 269         u_int8_t mfc_flags[MAXVIFS];            /* the MRT_MFC_FLAGS_* flags */
 270         struct   in_addr mfc_rp;                /* the RP address            */
 271         struct   bw_meter *mfc_bw_meter;        /* list of bandwidth meters  */
 272 };
 273
 274 /*
 275  * Structure used to communicate from kernel to multicast router.
 276  * (Note the convenient similarity to an IP packet.)
 277  */
 278 struct igmpmsg {
 279         u_int32_t unused1;
 280         u_int32_t unused2;
 281         u_int8_t  im_msgtype;           /* what type of message */
 282 #define IGMPMSG_NOCACHE         1       /* no MFC in the kernel             */
 283 #define IGMPMSG_WRONGVIF        2       /* packet came from wrong interface */
 284 #define IGMPMSG_WHOLEPKT        3       /* PIM pkt for user level encap.    */
 285 #define IGMPMSG_BW_UPCALL       4       /* BW monitoring upcall             */
 286         u_int8_t  im_mbz;               /* must be zero */
 287         u_int8_t  im_vif;               /* vif rec'd on */
 288         u_int8_t  unused3;
 289         struct    in_addr im_src, im_dst;
 290 } __packed;
 291
 292 /*
 293  * Argument structure used for pkt info. while upcall is made.
 294  */
 295 struct rtdetq {
 296         struct  mbuf *m;                /* a copy of the packet */
 297         struct  ifnet *ifp;             /* interface pkt came in on */
 298 #ifdef UPCALL_TIMING
 299         struct  timeval t;              /* timestamp */
 300 #endif /* UPCALL_TIMING */
 301         struct  rtdetq *next;
 302 };
 303
 304 #define MFCTBLSIZ       256
 305 #define MAX_UPQ         4               /* max. no of pkts in upcall Q */
 306
 307 /*
 308  * Token bucket filter code
 309  */
 310 #define MAX_BKT_SIZE    10000           /* 10K bytes size */
 311 #define MAXQSIZE        10              /* max. no of pkts in token queue */
 312
 313 /*
 314  * Structure for measuring the bandwidth and sending an upcall if the
 315  * measured bandwidth is above or below a threshold.
 316  */
 317 struct bw_meter {
 318         struct bw_meter *bm_mfc_next;           /* next bw meter (same mfc)  */
 319         struct bw_meter *bm_time_next;          /* next bw meter (same time) */
 320         uint32_t        bm_time_hash;           /* the time hash value       */
 321         struct mfc      *bm_mfc;                /* the corresponding mfc     */
 322         uint32_t        bm_flags;               /* misc flags (see below)    */
 323 #define BW_METER_UNIT_PACKETS   (1 << 0)        /* threshold (in packets)    */
 324 #define BW_METER_UNIT_BYTES     (1 << 1)        /* threshold (in bytes)      */
 325 #define BW_METER_GEQ            (1 << 2)        /* upcall if bw >= threshold */
 326 #define BW_METER_LEQ            (1 << 3)        /* upcall if bw <= threshold */
 327 #define BW_METER_USER_FLAGS     (BW_METER_UNIT_PACKETS |                \
 328                                  BW_METER_UNIT_BYTES |                  \
 329                                  BW_METER_GEQ |                         \
 330                                  BW_METER_LEQ)
 331
 332 #define BW_METER_UPCALL_DELIVERED (1 << 24)     /* upcall was delivered      */
 333
 334         struct bw_data  bm_threshold;           /* the upcall threshold      */
 335         struct bw_data  bm_measured;            /* the measured bw           */
 336         struct timeval  bm_start_time;          /* abs. time                 */
 337 };
 338
 339 int     ip_mrouter_set(struct socket *, struct sockopt *);
 340 int     ip_mrouter_get(struct socket *, struct sockopt *);
 341 int     mrt_ioctl(struct socket *, u_long, void *);
 342 int     ip_mrouter_done(void);
 343 void    ip_mrouter_detach(struct ifnet *);
 344 void    reset_vif(struct vif *);
 345 #ifdef RSVP_ISI
 346 int     ip_mforward(struct mbuf *, struct ifnet *, struct ip_moptions *);
 347 int     legal_vif_num(int);
 348 int     ip_rsvp_vif_init(struct socket *, struct mbuf *);
 349 int     ip_rsvp_vif_done(struct socket *, struct mbuf *);
 350 void    ip_rsvp_force_done(struct socket *);
 351 void    rsvp_input(struct mbuf *, int, int);
 352 #else
 353 int     ip_mforward(struct mbuf *, struct ifnet *);
 354 #endif
 355
 356 #endif /* _KERNEL */
 357
 358 #endif /* !_NETINET_IP_MROUTE_H_ */