sys/netgraph7/netflow/ng_netflow.h

   1 /*-
   2  * Copyright (c) 2004-2005 Gleb Smirnoff <glebius@FreeBSD.org>
   3  * Copyright (c) 2001-2003 Roman V. Palagin <romanp@unshadow.net>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  *       $SourceForge: ng_netflow.h,v 1.26 2004/09/04 15:44:55 glebius Exp $
  28  *       $FreeBSD: src/sys/netgraph/netflow/ng_netflow.h,v 1.10 2007/03/28 13:59:13 glebius Exp $
  29  */
  30
  31 #ifndef _NG_NETFLOW_H_
  32 #define _NG_NETFLOW_H_
  33
  34 #define NG_NETFLOW_NODE_TYPE    "netflow"
  35 #define NGM_NETFLOW_COOKIE      1137078102
  36
  37 #define NG_NETFLOW_MAXIFACES    USHRT_MAX
  38
  39 /* Hook names */
  40
  41 #define NG_NETFLOW_HOOK_DATA    "iface"
  42 #define NG_NETFLOW_HOOK_OUT     "out"
  43 #define NG_NETFLOW_HOOK_EXPORT  "export"
  44
  45 /* Netgraph commands understood by netflow node */
  46 enum {
  47     NGM_NETFLOW_INFO = 1|NGM_READONLY|NGM_HASREPLY,     /* get node info */
  48     NGM_NETFLOW_IFINFO = 2|NGM_READONLY|NGM_HASREPLY,   /* get iface info */
  49     NGM_NETFLOW_SHOW = 3|NGM_READONLY|NGM_HASREPLY,     /* show ip cache flow */
  50     NGM_NETFLOW_SETDLT          = 4,    /* set data-link type */
  51     NGM_NETFLOW_SETIFINDEX      = 5,    /* set interface index */
  52     NGM_NETFLOW_SETTIMEOUTS     = 6,    /* set active/inactive flow timeouts */
  53 };
  54
  55 /* This structure is returned by the NGM_NETFLOW_INFO message */
  56 struct ng_netflow_info {
  57         uint64_t        nfinfo_bytes;           /* accounted bytes */
  58         uint32_t        nfinfo_packets;         /* accounted packets */
  59         uint32_t        nfinfo_used;            /* used cache records */
  60         uint32_t        nfinfo_alloc_failed;    /* failed allocations */
  61         uint32_t        nfinfo_export_failed;   /* failed exports */
  62         uint32_t        nfinfo_act_exp;         /* active expiries */
  63         uint32_t        nfinfo_inact_exp;       /* inactive expiries */
  64         uint32_t        nfinfo_inact_t;         /* flow inactive timeout */
  65         uint32_t        nfinfo_act_t;           /* flow active timeout */
  66 };
  67
  68 /* This structure is returned by the NGM_NETFLOW_IFINFO message */
  69 struct ng_netflow_ifinfo {
  70         uint32_t        ifinfo_packets; /* number of packets for this iface */
  71         uint8_t         ifinfo_dlt;     /* Data Link Type, DLT_XXX */
  72 #define MAXDLTNAMELEN   20
  73         u_int16_t       ifinfo_index;   /* connected iface index */
  74 };
  75
  76
  77 /* This structure is passed to NGM_NETFLOW_SETDLT message */
  78 struct ng_netflow_setdlt {
  79         uint16_t iface;         /* which iface dlt change */
  80         uint8_t  dlt;                   /* DLT_XXX from bpf.h */
  81 };
  82
  83 /* This structure is passed to NGM_NETFLOW_SETIFINDEX */
  84 struct ng_netflow_setifindex {
  85         u_int16_t iface;                /* which iface index change */
  86         u_int16_t index;                /* new index */
  87 };
  88
  89 /* This structure is passed to NGM_NETFLOW_SETTIMEOUTS */
  90 struct ng_netflow_settimeouts {
  91         uint32_t        inactive_timeout;       /* flow inactive timeout */
  92         uint32_t        active_timeout;         /* flow active timeout */
  93 };
  94
  95 /* This is unique data, which identifies flow */
  96 struct flow_rec {
  97         struct in_addr  r_src;
  98         struct in_addr  r_dst;
  99         union {
 100                 struct {
 101                         uint16_t        s_port; /* source TCP/UDP port */
 102                         uint16_t        d_port; /* destination TCP/UDP port */
 103                 } dir;
 104                 uint32_t both;
 105         } ports;
 106         union {
 107                 struct {
 108                         u_char          prot;   /* IP protocol */
 109                         u_char          tos;    /* IP TOS */
 110                         uint16_t        i_ifx;  /* input interface index */
 111                 } i;
 112                 uint32_t all;
 113         } misc;
 114 };
 115
 116 #define r_ip_p  misc.i.prot
 117 #define r_tos   misc.i.tos
 118 #define r_i_ifx misc.i.i_ifx
 119 #define r_misc  misc.all
 120 #define r_ports ports.both
 121 #define r_sport ports.dir.s_port
 122 #define r_dport ports.dir.d_port
 123
 124 /* A flow entry which accumulates statistics */
 125 struct flow_entry_data {
 126         struct flow_rec         r;
 127         struct in_addr          next_hop;
 128         uint16_t                fle_o_ifx;      /* output interface index */
 129 #define                         fle_i_ifx       r.misc.i.i_ifx
 130         uint8_t         dst_mask;       /* destination route mask bits */
 131         uint8_t         src_mask;       /* source route mask bits */
 132         u_long                  packets;
 133         u_long                  bytes;
 134         long                    first;  /* uptime on first packet */
 135         long                    last;   /* uptime on last packet */
 136         u_char                  tcp_flags;      /* cumulative OR */
 137 };
 138
 139 /*
 140  * How many flow records we will transfer at once
 141  * without overflowing socket receive buffer
 142  */
 143 #define NREC_AT_ONCE            1000
 144 #define NGRESP_SIZE             (sizeof(struct ngnf_flows) + (NREC_AT_ONCE * \
 145                                 sizeof(struct flow_entry_data)))
 146 #define SORCVBUF_SIZE           (NGRESP_SIZE + 2 * sizeof(struct ng_mesg))
 147
 148 /* This struct is returned to userland, when "show cache ip flow" */
 149 struct ngnf_flows {
 150         uint32_t                nentries;
 151         uint32_t                last;
 152         struct flow_entry_data  entries[0];
 153 };
 154
 155 /* Everything below is for kernel */
 156
 157 #ifdef _KERNEL
 158
 159 struct flow_entry {
 160         struct flow_entry_data  f;
 161         TAILQ_ENTRY(flow_entry) fle_hash;       /* entries in hash slot */
 162 };
 163
 164 /* Parsing declarations */
 165
 166 /* Parse the info structure */
 167 #define NG_NETFLOW_INFO_TYPE    {                       \
 168         { "Bytes",      &ng_parse_uint64_type },        \
 169         { "Packets",    &ng_parse_uint32_type },        \
 170         { "Records used",       &ng_parse_uint32_type },\
 171         { "Failed allocations", &ng_parse_uint32_type },\
 172         { "Failed exports",     &ng_parse_uint32_type },\
 173         { "Active expiries",    &ng_parse_uint32_type },\
 174         { "Inactive expiries",  &ng_parse_uint32_type },\
 175         { "Inactive timeout",   &ng_parse_uint32_type },\
 176         { "Active timeout",     &ng_parse_uint32_type },\
 177         { NULL }                                        \
 178 }
 179
 180 /* Parse the ifinfo structure */
 181 #define NG_NETFLOW_IFINFO_TYPE  {                       \
 182         { "packets",    &ng_parse_uint32_type },        \
 183         { "data link type", &ng_parse_uint8_type },     \
 184         { "index", &ng_parse_uint16_type },             \
 185         { NULL }                                        \
 186 }
 187
 188 /* Parse the setdlt structure */
 189 #define NG_NETFLOW_SETDLT_TYPE {                        \
 190         { "iface",      &ng_parse_uint16_type },        \
 191         { "dlt",        &ng_parse_uint8_type  },        \
 192         { NULL }                                        \
 193 }
 194
 195 /* Parse the setifindex structure */
 196 #define NG_NETFLOW_SETIFINDEX_TYPE {                    \
 197         { "iface",      &ng_parse_uint16_type },        \
 198         { "index",      &ng_parse_uint16_type },        \
 199         { NULL }                                        \
 200 }
 201
 202 /* Parse the settimeouts structure */
 203 #define NG_NETFLOW_SETTIMEOUTS_TYPE {                   \
 204         { "inactive",   &ng_parse_uint32_type },        \
 205         { "active",     &ng_parse_uint32_type },        \
 206         { NULL }                                        \
 207 }
 208
 209 /* Private hook data */
 210 struct ng_netflow_iface {
 211         hook_p          hook;           /* NULL when disconnected */
 212         hook_p          out;            /* NULL when no bypass hook */
 213         struct ng_netflow_ifinfo        info;
 214 };
 215
 216 typedef struct ng_netflow_iface *iface_p;
 217 typedef struct ng_netflow_ifinfo *ifinfo_p;
 218
 219 /* Structure describing our flow engine */
 220 struct netflow {
 221         node_p                  node;           /* link to the node itself */
 222         hook_p                  export;         /* export data goes there */
 223
 224         struct ng_netflow_info  info;
 225         struct callout          exp_callout;    /* expiry periodic job */
 226
 227         /*
 228          * Flow entries are allocated in uma(9) zone zone. They are
 229          * indexed by hash hash. Each hash element consist of tailqueue
 230          * head and mutex to protect this element.
 231          */
 232 #define CACHESIZE                       (65536*4)
 233 #define CACHELOWAT                      (CACHESIZE * 3/4)
 234 #define CACHEHIGHWAT                    (CACHESIZE * 9/10)
 235         uma_zone_t              zone;
 236         struct flow_hash_entry  *hash;
 237
 238         /*
 239          * NetFlow data export
 240          *
 241          * export_item is a data item, it has an mbuf with cluster
 242          * attached to it. A thread detaches export_item from priv
 243          * and works with it. If the export is full it is sent, and
 244          * a new one is allocated. Before exiting thread re-attaches
 245          * its current item back to priv. If there is item already,
 246          * current incomplete datagram is sent.
 247          * export_mtx is used for attaching/detaching.
 248          */
 249         item_p                  export_item;
 250         struct mtx              export_mtx;
 251         uint32_t                flow_seq;       /* current flow sequence */
 252
 253         struct ng_netflow_iface ifaces[NG_NETFLOW_MAXIFACES];
 254 };
 255
 256 typedef struct netflow *priv_p;
 257
 258 /* Header of a small list in hash cell */
 259 struct flow_hash_entry {
 260         struct mtx              mtx;
 261         TAILQ_HEAD(fhead, flow_entry) head;
 262 };
 263
 264 #define ERROUT(x)       { error = (x); goto done; }
 265
 266 /* Prototypes for netflow.c */
 267 int     ng_netflow_cache_init(priv_p);
 268 void    ng_netflow_cache_flush(priv_p);
 269 void    ng_netflow_copyinfo(priv_p, struct ng_netflow_info *);
 270 timeout_t ng_netflow_expire;
 271 int     ng_netflow_flow_add(priv_p, struct ip *, iface_p, struct ifnet *);
 272 int     ng_netflow_flow_show(priv_p, uint32_t last, struct ng_mesg *);
 273
 274 #endif  /* _KERNEL */
 275 #endif  /* _NG_NETFLOW_H_ */