rlm_stats.c

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/*
 *   This program is is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or (at
 *   your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: 4c28094fcf90c1f6056fcc1b0213c9a74a3be38d $
 * @file rlm_stats.c
 * @brief Keep RADIUS statistics. Eventually, also non-RADIUS statistics
 *
 * @copyright 2017 Network RADIUS SAS (license@networkradius.com)
 */
RCSID("$Id: 4c28094fcf90c1f6056fcc1b0213c9a74a3be38d $")
 
#include <freeradius-devel/server/base.h>
#include <freeradius-devel/server/module_rlm.h>
#include <freeradius-devel/io/listen.h>
#include <freeradius-devel/util/dlist.h>
#include <freeradius-devel/util/debug.h>
#include <freeradius-devel/radius/radius.h>
 
#include <freeradius-devel/protocol/radius/freeradius.h>
 
/*
 *      @todo - also get the statistics from the network side for
 *              that, though, we need a way to find other network
 *              sockets (i.e. not this one), and then query them for
 *              statistics.
 */
 
#include <pthread.h>
 
typedef struct {
        pthread_mutex_t         mutex;
        fr_dlist_head_t         list;                           //!< for threads to know about each other
        uint64_t                stats[FR_RADIUS_CODE_MAX];
} rlm_stats_mutable_t;
 
/*
 *      @todo - MULTI_PROTOCOL - make this protocol agnostic.
 *      Perhaps keep stats in a hash table by (request->dict, request->code) ?
 */
 
typedef struct {
        rlm_stats_mutable_t     *mutable;
        fr_dict_attr_t const    *type_da;                       //!< FreeRADIUS-Stats4-Type
        fr_dict_attr_t const    *ipv4_da;                       //!< FreeRADIUS-Stats4-IPv4-Address
        fr_dict_attr_t const    *ipv6_da;                       //!< FreeRADIUS-Stats4-IPv6-Address
 
 
} rlm_stats_t;
 
typedef struct {
        fr_rb_node_t            src_node;
        fr_rb_node_t            dst_node;
        fr_ipaddr_t             ipaddr;                         //!< IP address of this thing
        fr_time_t               created;                        //!< when it was created
        fr_time_t               last_packet;                    //!< when we last saw a packet
        uint64_t                stats[FR_RADIUS_CODE_MAX];      //!< actual statistic
} rlm_stats_data_t;
 
typedef struct {
        rlm_stats_t             *inst;
 
        fr_time_t               last_global_update;
        fr_dlist_t              entry;                          //!< for threads to know about each other
 
        fr_time_t               last_manage;                    //!< when we deleted old things
 
        fr_rb_tree_t            *src;                           //!< stats by source
        fr_rb_tree_t            *dst;                           //!< stats by destination
 
        uint64_t                stats[FR_RADIUS_CODE_MAX];
 
        pthread_mutex_t         mutex;
} rlm_stats_thread_t;
 
static const conf_parser_t module_config[] = {
        CONF_PARSER_TERMINATOR
};
 
static fr_dict_t const *dict_radius;
 
extern fr_dict_autoload_t rlm_stats_dict[];
fr_dict_autoload_t rlm_stats_dict[] = {
        { .out = &dict_radius, .proto = "radius" },
        { NULL }
};
 
static fr_dict_attr_t const *attr_freeradius_stats4_ipv4_address;
static fr_dict_attr_t const *attr_freeradius_stats4_ipv6_address;
static fr_dict_attr_t const *attr_freeradius_stats4_type;
 
extern fr_dict_attr_autoload_t rlm_stats_dict_attr[];
fr_dict_attr_autoload_t rlm_stats_dict_attr[] = {
        { .out = &attr_freeradius_stats4_ipv4_address, .name = "Vendor-Specific.FreeRADIUS.Stats4.Stats4-IPv4-Address", .type = FR_TYPE_IPV4_ADDR, .dict = &dict_radius },
        { .out = &attr_freeradius_stats4_ipv6_address, .name = "Vendor-Specific.FreeRADIUS.Stats4.Stats4-IPv6-Address", .type = FR_TYPE_IPV6_ADDR, .dict = &dict_radius },
        { .out = &attr_freeradius_stats4_type, .name = "Vendor-Specific.FreeRADIUS.Stats4.Stats4-Type", .type = FR_TYPE_UINT32, .dict = &dict_radius },
        { NULL }
};
 
static void coalesce(uint64_t final_stats[FR_RADIUS_CODE_MAX], rlm_stats_thread_t *t,
                     size_t tree_offset, rlm_stats_data_t *mydata)
{
        rlm_stats_data_t *stats;
        rlm_stats_thread_t *other;
        fr_rb_tree_t **tree;
        uint64_t local_stats[FR_RADIUS_CODE_MAX];
 
        tree = (fr_rb_tree_t **) (((uint8_t *) t) + tree_offset);
 
        /*
         *      Bootstrap with my statistics, where we don't need a
         *      lock.
         */
        stats = fr_rb_find(*tree, mydata);
        if (!stats) {
                memset(final_stats, 0, sizeof(uint64_t) * FR_RADIUS_CODE_MAX);
        } else {
                memcpy(final_stats, stats->stats, sizeof(stats->stats));
        }
 
        /*
         *      Loop over all of the other thread instances, locking
         *      them, and adding their statistics in.
         */
        pthread_mutex_lock(&t->inst->mutable->mutex);
        for (other = fr_dlist_head(&t->inst->mutable->list);
             other != NULL;
             other = fr_dlist_next(&t->inst->mutable->list, other)) {
                int i;
 
                if (other == t) continue;
 
                tree = (fr_rb_tree_t **) (((uint8_t *) other) + tree_offset);
                pthread_mutex_lock(&other->mutex);
                stats = fr_rb_find(*tree, mydata);
 
                if (!stats) {
                        pthread_mutex_unlock(&other->mutex);
                        continue;
                }
                memcpy(&local_stats, stats->stats, sizeof(stats->stats));
 
                for (i = 0; i < FR_RADIUS_CODE_MAX; i++) {
                        final_stats[i] += local_stats[i];
                }
 
                pthread_mutex_unlock(&other->mutex);
        }
        pthread_mutex_unlock(&t->inst->mutable->mutex);
}
 
 
/*
 *      Do the statistics
 */
static unlang_action_t CC_HINT(nonnull) mod_stats(rlm_rcode_t *p_result, module_ctx_t const *mctx, request_t *request)
{
        rlm_stats_t             *inst = talloc_get_type_abort(mctx->mi->data, rlm_stats_t);
        rlm_stats_thread_t      *t = talloc_get_type_abort(mctx->thread, rlm_stats_thread_t);
        int                     i;
        uint32_t                stats_type;
 
 
        fr_pair_t *vp;
        rlm_stats_data_t mydata;
        char buffer[64];
        uint64_t local_stats[NUM_ELEMENTS(inst->mutable->stats)];
 
        /*
         *      Increment counters only in "send foo" sections.
         *
         *      i.e. only when we have a reply to send.
         *
         *      FIXME - Nothing sets request_state anymore
         */
#if 0
        if (request->request_state == REQUEST_SEND) {
                int src_code, dst_code;
                rlm_stats_data_t *stats;
 
                src_code = request->packet->code;
                if (src_code >= FR_RADIUS_CODE_MAX) src_code = 0;
 
                dst_code = request->reply->code;
                if (dst_code >= FR_RADIUS_CODE_MAX) dst_code = 0;
 
                pthread_mutex_lock(&t->mutex);
                t->stats[src_code]++;
                t->stats[dst_code]++;
 
                /*
                 *      Update source statistics
                 */
                mydata.ipaddr = request->packet->socket.inet.src_ipaddr;
                stats = fr_rb_find(t->src, &mydata);
                if (!stats) {
                        MEM(stats = talloc_zero(t, rlm_stats_data_t));
 
                        stats->ipaddr = request->packet->socket.inet.src_ipaddr;
                        stats->created = request->async->recv_time;
 
                        (void) fr_rb_insert(t->src, stats);
                }
 
                stats->last_packet = request->async->recv_time;
                stats->stats[src_code]++;
                stats->stats[dst_code]++;
 
                /*
                 *      Update destination statistics
                 */
                mydata.ipaddr = request->packet->socket.inet.dst_ipaddr;
                stats = fr_rb_find(t->dst, &mydata);
                if (!stats) {
                        MEM(stats = talloc_zero(t, rlm_stats_data_t));
 
                        stats->ipaddr = request->packet->socket.inet.dst_ipaddr;
                        stats->created = request->async->recv_time;
 
                        (void) fr_rb_insert(t->dst, stats);
                }
 
                stats->last_packet = request->async->recv_time;
                stats->stats[src_code]++;
                stats->stats[dst_code]++;
                pthread_mutex_unlock(&t->mutex);
 
                /*
                 *      @todo - periodically clean up old entries.
                 */
 
                if ((t->last_global_update + NSEC) > request->async->recv_time) {
                        RETURN_MODULE_UPDATED;
                }
 
                t->last_global_update = request->async->recv_time;
 
                pthread_mutex_lock(&inst->mutable->mutex);
                for (i = 0; i < FR_RADIUS_CODE_MAX; i++) {
                        inst->mutable->stats[i] += t->stats[i];
                        t->stats[i] = 0;
                }
                pthread_mutex_unlock(&inst->mutable->mutex);
 
                RETURN_MODULE_UPDATED;
        }
#endif
 
        /*
         *      Ignore "authenticate" and anything other than Status-Server
         */
        if ((request->packet->code != FR_RADIUS_CODE_STATUS_SERVER)) {
                RETURN_MODULE_NOOP;
        }
 
        vp = fr_pair_find_by_da_nested(&request->request_pairs, NULL, attr_freeradius_stats4_type);
        if (!vp) {
                stats_type = FR_STATS4_TYPE_VALUE_GLOBAL;
        } else {
                stats_type = vp->vp_uint32;
        }
 
        /*
         *      Create attributes based on the statistics.
         */
        MEM(pair_update_reply(&vp, attr_freeradius_stats4_type) >= 0);
        vp->vp_uint32 = stats_type;
 
        switch (stats_type) {
        case FR_STATS4_TYPE_VALUE_GLOBAL:                       /* global */
                /*
                 *      Merge our stats with the global stats, and then copy
                 *      the global stats to a thread-local variable.
                 *
                 *      The copy helps minimize mutex contention.
                 */
                pthread_mutex_lock(&inst->mutable->mutex);
                for (i = 0; i < FR_RADIUS_CODE_MAX; i++) {
                        inst->mutable->stats[i] += t->stats[i];
                        t->stats[i] = 0;
                }
                memcpy(&local_stats, inst->mutable->stats, sizeof(inst->mutable->stats));
                pthread_mutex_unlock(&inst->mutable->mutex);
                vp = NULL;
                break;
 
        case FR_STATS4_TYPE_VALUE_CLIENT:                       /* src */
                vp = fr_pair_find_by_da_nested(&request->request_pairs, NULL, attr_freeradius_stats4_ipv4_address);
                if (!vp) vp = fr_pair_find_by_da_nested(&request->request_pairs, NULL, attr_freeradius_stats4_ipv6_address);
                if (!vp) RETURN_MODULE_NOOP;
 
                mydata.ipaddr = vp->vp_ip;
                coalesce(local_stats, t, offsetof(rlm_stats_thread_t, src), &mydata);
                break;
 
        case FR_STATS4_TYPE_VALUE_LISTENER:                     /* dst */
                vp = fr_pair_find_by_da_nested(&request->request_pairs, NULL, attr_freeradius_stats4_ipv4_address);
                if (!vp) vp = fr_pair_find_by_da_nested(&request->request_pairs, NULL, attr_freeradius_stats4_ipv6_address);
                if (!vp) RETURN_MODULE_NOOP;
 
                mydata.ipaddr = vp->vp_ip;
                coalesce(local_stats, t, offsetof(rlm_stats_thread_t, dst), &mydata);
                break;
 
        default:
                REDEBUG("Invalid value '%d' for FreeRADIUS-Stats4-type", stats_type);
                RETURN_MODULE_FAIL;
        }
 
        if (vp ) {
                vp = fr_pair_copy(request->reply_ctx, vp);
                if (vp) {
                        fr_pair_append(&request->reply_pairs, vp);
                }
        }
 
        /*
         *      @todo - do this only for RADIUS
         *      key off of packet ID, and Stats4-Packet-Counters TLV.
         */
        strcpy(buffer, "FreeRADIUS-Stats4-");
 
        for (i = 0; i < FR_RADIUS_CODE_MAX; i++) {
                fr_dict_attr_t const *da;
 
                if (!local_stats[i]) continue;
 
                strlcpy(buffer + 18, fr_radius_packet_name[i], sizeof(buffer) - 18);
                da = fr_dict_attr_by_name(NULL, fr_dict_root(dict_radius), buffer);
                if (!da) continue;
 
                MEM(vp = fr_pair_afrom_da(request->reply_ctx, da));
                vp->vp_uint64 = local_stats[i];
 
                fr_pair_append(&request->reply_pairs, vp);
        }
 
        RETURN_MODULE_OK;
}
 
 
static int8_t data_cmp(const void *one, const void *two)
{
        rlm_stats_data_t const *a = one;
        rlm_stats_data_t const *b = two;
 
        return fr_ipaddr_cmp(&a->ipaddr, &b->ipaddr);
}
 
/** Instantiate thread data for the submodule.
 *
 */
static int mod_thread_instantiate(module_thread_inst_ctx_t const *mctx)
{
        rlm_stats_t *inst = talloc_get_type_abort(mctx->mi->data, rlm_stats_t);
        rlm_stats_thread_t *t = talloc_get_type_abort(mctx->thread, rlm_stats_thread_t);
 
        (void) talloc_set_type(t, rlm_stats_thread_t);
 
        t->inst = inst;
 
        t->src = fr_rb_inline_talloc_alloc(t, rlm_stats_data_t, src_node, data_cmp, NULL);
        if (unlikely(!t->src)) return -1;
 
        t->dst = fr_rb_inline_talloc_alloc(t, rlm_stats_data_t, dst_node, data_cmp, NULL);
        if (unlikely(!t->dst)) {
                TALLOC_FREE(t->src);
                return -1;
        }
 
        pthread_mutex_lock(&inst->mutable->mutex);
        fr_dlist_insert_head(&inst->mutable->list, t);
        pthread_mutex_unlock(&inst->mutable->mutex);
 
        return 0;
}
 
 
/** Destroy thread data for the submodule.
 *
 */
static int mod_thread_detach(module_thread_inst_ctx_t const *mctx)
{
        rlm_stats_thread_t      *t = talloc_get_type_abort(mctx->thread, rlm_stats_thread_t);
        rlm_stats_t             *inst = t->inst;
        int                     i;
 
        pthread_mutex_lock(&inst->mutable->mutex);
        for (i = 0; i < FR_RADIUS_CODE_MAX; i++) {
                inst->mutable->stats[i] += t->stats[i];
        }
        fr_dlist_remove(&inst->mutable->list, t);
        pthread_mutex_unlock(&inst->mutable->mutex);
        pthread_mutex_destroy(&t->mutex);
 
        return 0;
}
 
static int mod_instantiate(module_inst_ctx_t const *mctx)
{
        rlm_stats_t     *inst = talloc_get_type_abort(mctx->mi->data, rlm_stats_t);
 
        MEM(inst->mutable = talloc_zero(NULL, rlm_stats_mutable_t));
        pthread_mutex_init(&inst->mutable->mutex, NULL);
        fr_dlist_init(&inst->mutable->list, rlm_stats_thread_t, entry);
 
        return 0;
}
 
/*
 *      Only free memory we allocated.  The strings allocated via
 *      cf_section_parse() do not need to be freed.
 */
static int mod_detach(module_detach_ctx_t const *mctx)
{
        rlm_stats_t *inst = talloc_get_type_abort(mctx->mi->data, rlm_stats_t);
 
        pthread_mutex_destroy(&inst->mutable->mutex);
        talloc_free(inst->mutable);
 
        /* free things here */
        return 0;
}
 
/*
 *      The module name should be the only globally exported symbol.
 *      That is, everything else should be 'static'.
 *
 *      If the module needs to temporarily modify it's instantiation
 *      data, the type should be changed to MODULE_TYPE_THREAD_UNSAFE.
 *      The server will then take care of ensuring that the module
 *      is single-threaded.
 */
extern module_rlm_t rlm_stats;
 
module_rlm_t rlm_stats = {
        .common = {
                .magic                  = MODULE_MAGIC_INIT,
                .name                   = "stats",
                .inst_size              = sizeof(rlm_stats_t),
                .thread_inst_size       = sizeof(rlm_stats_thread_t),
                .config                 = module_config,
                .instantiate            = mod_instantiate,
                .detach                 = mod_detach,
                .thread_instantiate     = mod_thread_instantiate,
                .thread_detach          = mod_thread_detach
        },
        .method_group = {
                .bindings = (module_method_binding_t[]){
                        { .section = SECTION_NAME(CF_IDENT_ANY, CF_IDENT_ANY), .method = mod_stats },
                        MODULE_BINDING_TERMINATOR
                }
        }
};