freebsd-skq/sys/netgraph/netflow/ng_netflow.h
mav ca86878f8e Add ability to generate egress netflow instead or in addition to ingress.
Use mbuf tagging for accounted packets to not account packets twice when
both ingress and egress netflow enabled.
To keep compatibility new "setconfig" message added to control new
functionality. By default node works as before, doing only ingress
accounting without using mbuf tags.

Reviewed by:	glebius
2008-10-08 10:37:07 +00:00

300 lines
9.2 KiB
C

/*-
* Copyright (c) 2004-2005 Gleb Smirnoff <glebius@FreeBSD.org>
* Copyright (c) 2001-2003 Roman V. Palagin <romanp@unshadow.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $SourceForge: ng_netflow.h,v 1.26 2004/09/04 15:44:55 glebius Exp $
* $FreeBSD$
*/
#ifndef _NG_NETFLOW_H_
#define _NG_NETFLOW_H_
#define NG_NETFLOW_NODE_TYPE "netflow"
#define NGM_NETFLOW_COOKIE 1137078102
#define NG_NETFLOW_MAXIFACES USHRT_MAX
/* Hook names */
#define NG_NETFLOW_HOOK_DATA "iface"
#define NG_NETFLOW_HOOK_OUT "out"
#define NG_NETFLOW_HOOK_EXPORT "export"
/* Netgraph commands understood by netflow node */
enum {
NGM_NETFLOW_INFO = 1|NGM_READONLY|NGM_HASREPLY, /* get node info */
NGM_NETFLOW_IFINFO = 2|NGM_READONLY|NGM_HASREPLY, /* get iface info */
NGM_NETFLOW_SHOW = 3|NGM_READONLY|NGM_HASREPLY, /* show ip cache flow */
NGM_NETFLOW_SETDLT = 4, /* set data-link type */
NGM_NETFLOW_SETIFINDEX = 5, /* set interface index */
NGM_NETFLOW_SETTIMEOUTS = 6, /* set active/inactive flow timeouts */
NGM_NETFLOW_SETCONFIG = 7, /* set flow generation options */
};
/* This structure is returned by the NGM_NETFLOW_INFO message */
struct ng_netflow_info {
uint64_t nfinfo_bytes; /* accounted bytes */
uint32_t nfinfo_packets; /* accounted packets */
uint32_t nfinfo_used; /* used cache records */
uint32_t nfinfo_alloc_failed; /* failed allocations */
uint32_t nfinfo_export_failed; /* failed exports */
uint32_t nfinfo_act_exp; /* active expiries */
uint32_t nfinfo_inact_exp; /* inactive expiries */
uint32_t nfinfo_inact_t; /* flow inactive timeout */
uint32_t nfinfo_act_t; /* flow active timeout */
};
/* This structure is returned by the NGM_NETFLOW_IFINFO message */
struct ng_netflow_ifinfo {
uint32_t ifinfo_packets; /* number of packets for this iface */
uint8_t ifinfo_dlt; /* Data Link Type, DLT_XXX */
#define MAXDLTNAMELEN 20
u_int16_t ifinfo_index; /* connected iface index */
uint32_t conf;
};
/* This structure is passed to NGM_NETFLOW_SETDLT message */
struct ng_netflow_setdlt {
uint16_t iface; /* which iface dlt change */
uint8_t dlt; /* DLT_XXX from bpf.h */
};
/* This structure is passed to NGM_NETFLOW_SETIFINDEX */
struct ng_netflow_setifindex {
u_int16_t iface; /* which iface index change */
u_int16_t index; /* new index */
};
/* This structure is passed to NGM_NETFLOW_SETTIMEOUTS */
struct ng_netflow_settimeouts {
uint32_t inactive_timeout; /* flow inactive timeout */
uint32_t active_timeout; /* flow active timeout */
};
#define NG_NETFLOW_CONF_INGRESS 1
#define NG_NETFLOW_CONF_EGRESS 2
#define NG_NETFLOW_CONF_ONCE 4
#define NG_NETFLOW_CONF_THISONCE 8
/* This structure is passed to NGM_NETFLOW_SETCONFIG */
struct ng_netflow_setconfig {
u_int16_t iface; /* which iface config change */
u_int32_t conf; /* new config */
};
/* This is unique data, which identifies flow */
struct flow_rec {
struct in_addr r_src;
struct in_addr r_dst;
union {
struct {
uint16_t s_port; /* source TCP/UDP port */
uint16_t d_port; /* destination TCP/UDP port */
} dir;
uint32_t both;
} ports;
union {
struct {
u_char prot; /* IP protocol */
u_char tos; /* IP TOS */
uint16_t i_ifx; /* input interface index */
} i;
uint32_t all;
} misc;
};
#define r_ip_p misc.i.prot
#define r_tos misc.i.tos
#define r_i_ifx misc.i.i_ifx
#define r_misc misc.all
#define r_ports ports.both
#define r_sport ports.dir.s_port
#define r_dport ports.dir.d_port
/* A flow entry which accumulates statistics */
struct flow_entry_data {
struct flow_rec r;
struct in_addr next_hop;
uint16_t fle_o_ifx; /* output interface index */
#define fle_i_ifx r.misc.i.i_ifx
uint8_t dst_mask; /* destination route mask bits */
uint8_t src_mask; /* source route mask bits */
u_long packets;
u_long bytes;
long first; /* uptime on first packet */
long last; /* uptime on last packet */
u_char tcp_flags; /* cumulative OR */
};
/*
* How many flow records we will transfer at once
* without overflowing socket receive buffer
*/
#define NREC_AT_ONCE 1000
#define NGRESP_SIZE (sizeof(struct ngnf_flows) + (NREC_AT_ONCE * \
sizeof(struct flow_entry_data)))
#define SORCVBUF_SIZE (NGRESP_SIZE + 2 * sizeof(struct ng_mesg))
/* This struct is returned to userland, when "show cache ip flow" */
struct ngnf_flows {
uint32_t nentries;
uint32_t last;
struct flow_entry_data entries[0];
};
/* Everything below is for kernel */
#ifdef _KERNEL
struct flow_entry {
struct flow_entry_data f;
TAILQ_ENTRY(flow_entry) fle_hash; /* entries in hash slot */
};
/* Parsing declarations */
/* Parse the info structure */
#define NG_NETFLOW_INFO_TYPE { \
{ "Bytes", &ng_parse_uint64_type }, \
{ "Packets", &ng_parse_uint32_type }, \
{ "Records used", &ng_parse_uint32_type },\
{ "Failed allocations", &ng_parse_uint32_type },\
{ "Failed exports", &ng_parse_uint32_type },\
{ "Active expiries", &ng_parse_uint32_type },\
{ "Inactive expiries", &ng_parse_uint32_type },\
{ "Inactive timeout", &ng_parse_uint32_type },\
{ "Active timeout", &ng_parse_uint32_type },\
{ NULL } \
}
/* Parse the ifinfo structure */
#define NG_NETFLOW_IFINFO_TYPE { \
{ "packets", &ng_parse_uint32_type }, \
{ "data link type", &ng_parse_uint8_type }, \
{ "index", &ng_parse_uint16_type }, \
{ "conf", &ng_parse_uint32_type }, \
{ NULL } \
}
/* Parse the setdlt structure */
#define NG_NETFLOW_SETDLT_TYPE { \
{ "iface", &ng_parse_uint16_type }, \
{ "dlt", &ng_parse_uint8_type }, \
{ NULL } \
}
/* Parse the setifindex structure */
#define NG_NETFLOW_SETIFINDEX_TYPE { \
{ "iface", &ng_parse_uint16_type }, \
{ "index", &ng_parse_uint16_type }, \
{ NULL } \
}
/* Parse the settimeouts structure */
#define NG_NETFLOW_SETTIMEOUTS_TYPE { \
{ "inactive", &ng_parse_uint32_type }, \
{ "active", &ng_parse_uint32_type }, \
{ NULL } \
}
/* Parse the setifindex structure */
#define NG_NETFLOW_SETCONFIG_TYPE { \
{ "iface", &ng_parse_uint16_type }, \
{ "conf", &ng_parse_uint32_type }, \
{ NULL } \
}
/* Private hook data */
struct ng_netflow_iface {
hook_p hook; /* NULL when disconnected */
hook_p out; /* NULL when no bypass hook */
struct ng_netflow_ifinfo info;
};
typedef struct ng_netflow_iface *iface_p;
typedef struct ng_netflow_ifinfo *ifinfo_p;
/* Structure describing our flow engine */
struct netflow {
node_p node; /* link to the node itself */
hook_p export; /* export data goes there */
struct ng_netflow_info info;
struct callout exp_callout; /* expiry periodic job */
/*
* Flow entries are allocated in uma(9) zone zone. They are
* indexed by hash hash. Each hash element consist of tailqueue
* head and mutex to protect this element.
*/
#define CACHESIZE (65536*4)
#define CACHELOWAT (CACHESIZE * 3/4)
#define CACHEHIGHWAT (CACHESIZE * 9/10)
uma_zone_t zone;
struct flow_hash_entry *hash;
/*
* NetFlow data export
*
* export_item is a data item, it has an mbuf with cluster
* attached to it. A thread detaches export_item from priv
* and works with it. If the export is full it is sent, and
* a new one is allocated. Before exiting thread re-attaches
* its current item back to priv. If there is item already,
* current incomplete datagram is sent.
* export_mtx is used for attaching/detaching.
*/
item_p export_item;
struct mtx export_mtx;
uint32_t flow_seq; /* current flow sequence */
struct ng_netflow_iface ifaces[NG_NETFLOW_MAXIFACES];
};
typedef struct netflow *priv_p;
/* Header of a small list in hash cell */
struct flow_hash_entry {
struct mtx mtx;
TAILQ_HEAD(fhead, flow_entry) head;
};
#define ERROUT(x) { error = (x); goto done; }
#define MTAG_NETFLOW 1221656444
#define MTAG_NETFLOW_CALLED 0
/* Prototypes for netflow.c */
int ng_netflow_cache_init(priv_p);
void ng_netflow_cache_flush(priv_p);
void ng_netflow_copyinfo(priv_p, struct ng_netflow_info *);
timeout_t ng_netflow_expire;
int ng_netflow_flow_add(priv_p, struct ip *, unsigned int src_if_index);
int ng_netflow_flow_show(priv_p, uint32_t last, struct ng_mesg *);
#endif /* _KERNEL */
#endif /* _NG_NETFLOW_H_ */