src/plugin_nfacct.c

   1 #include "common.h"
   2
   3 #ifdef INTERNAL_PLUGIN_NFACCT
   4 #include <libmnl/libmnl.h>
   5 #include <libnetfilter_acct/libnetfilter_acct.h>
   6
   7 struct mynfacct {
   8     const char *name;
   9     uint32_t hash;
  10
  11     uint64_t pkts;
  12     uint64_t bytes;
  13
  14     RRDDIM *rd_bytes;
  15     RRDDIM *rd_packets;
  16
  17     int updated;
  18 };
  19
  20 struct nfacct_list {
  21     int size;
  22     int len;
  23     struct mynfacct data[];
  24 } *nfacct_list = NULL;
  25
  26 static inline void nfacct_list_grow() {
  27     if(!nfacct_list || nfacct_list->len == nfacct_list->size) {
  28         int size = (nfacct_list) ? nfacct_list->size : 0;
  29         int len = (nfacct_list) ? nfacct_list->len : 0;
  30         size++;
  31
  32         info("nfacct.plugin: increasing nfacct_list to size %d", size);
  33
  34         nfacct_list = reallocz(nfacct_list, sizeof(struct nfacct_list) + (sizeof(struct mynfacct) * size));
  35
  36         nfacct_list->data[len].rd_bytes = NULL;
  37         nfacct_list->data[len].rd_packets = NULL;
  38         nfacct_list->data[len].updated = 0;
  39
  40         nfacct_list->size = size;
  41         nfacct_list->len = len;
  42     }
  43 }
  44
  45 static int nfacct_callback(const struct nlmsghdr *nlh, void *data) {
  46     (void)data;
  47
  48     static struct nfacct *nfacct = NULL;
  49
  50     if(unlikely(!nfacct)) {
  51         nfacct = nfacct_alloc();
  52         if(!nfacct) {
  53             error("nfacct.plugin: nfacct_alloc() failed.");
  54             return MNL_CB_OK;
  55         }
  56     }
  57
  58     if(nfacct_nlmsg_parse_payload(nlh, nfacct) < 0) {
  59         error("nfacct.plugin: nfacct_nlmsg_parse_payload() failed.");
  60         return MNL_CB_OK;
  61     }
  62
  63     const char *name = nfacct_attr_get_str(nfacct, NFACCT_ATTR_NAME);
  64     uint32_t hash = simple_hash(name);
  65
  66     int i;
  67     struct mynfacct *mynfacct = NULL;
  68     for(i = 0; i < nfacct_list->len; i++) {
  69         if(nfacct_list->data[i].hash == hash && !strcmp(nfacct_list->data[i].name, name)) {
  70             mynfacct = &nfacct_list->data[i];
  71             break;
  72         }
  73     }
  74
  75     if(!mynfacct) {
  76         nfacct_list_grow();
  77         mynfacct = &nfacct_list->data[nfacct_list->len++];
  78         mynfacct->name = name;
  79         mynfacct->hash = hash;
  80     }
  81
  82     mynfacct->pkts  = nfacct_attr_get_u64(nfacct, NFACCT_ATTR_PKTS);
  83     mynfacct->bytes = nfacct_attr_get_u64(nfacct, NFACCT_ATTR_BYTES);
  84     mynfacct->updated = 1;
  85
  86     nfacct_list->len++;
  87     return MNL_CB_OK;
  88 }
  89
  90 void *nfacct_main(void *ptr) {
  91     struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
  92
  93     info("NFACCT thread created with task id %d", gettid());
  94
  95     if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
  96         error("nfacct.plugin: Cannot set pthread cancel type to DEFERRED.");
  97
  98     if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
  99         error("nfacct.plugin: Cannot set pthread cancel state to ENABLE.");
 100
 101     char buf[MNL_SOCKET_BUFFER_SIZE];
 102     struct mnl_socket *nl = NULL;
 103     struct nlmsghdr *nlh = NULL;
 104     unsigned int seq = 0, portid = 0;
 105
 106     seq = (unsigned int)now_realtime_sec() - 1;
 107
 108     nl  = mnl_socket_open(NETLINK_NETFILTER);
 109     if(!nl) {
 110         error("nfacct.plugin: mnl_socket_open() failed");
 111         goto cleanup;
 112     }
 113
 114     if(mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
 115         error("nfacct.plugin: mnl_socket_bind() failed");
 116         goto cleanup;
 117     }
 118     portid = mnl_socket_get_portid(nl);
 119
 120     // ------------------------------------------------------------------------
 121
 122     RRDSET *st_bytes = NULL, *st_packets = NULL;
 123
 124     // ------------------------------------------------------------------------
 125
 126     int update_every = (int)config_get_number("plugin:nfacct", "update every", localhost->rrd_update_every);
 127     if(update_every < localhost->rrd_update_every)
 128         update_every = localhost->rrd_update_every;
 129
 130     usec_t step = update_every * USEC_PER_SEC;
 131     heartbeat_t hb;
 132     heartbeat_init(&hb);
 133     for(;;) {
 134         heartbeat_dt_usec(&hb);
 135         heartbeat_next(&hb, step);
 136
 137         if(unlikely(netdata_exit)) break;
 138
 139         seq++;
 140
 141         nlh = nfacct_nlmsg_build_hdr(buf, NFNL_MSG_ACCT_GET, NLM_F_DUMP, (uint32_t)seq);
 142         if(!nlh) {
 143             error("nfacct.plugin: nfacct_nlmsg_build_hdr() failed");
 144             goto cleanup;
 145         }
 146
 147         if(mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
 148             error("nfacct.plugin: mnl_socket_send");
 149             goto cleanup;
 150         }
 151
 152         ssize_t ret;
 153         while((ret = mnl_socket_recvfrom(nl, buf, sizeof(buf))) > 0) {
 154             if((ret = mnl_cb_run(buf, (size_t)ret, seq, portid, nfacct_callback, NULL)) <= 0) break;
 155         }
 156
 157         if (ret == -1) {
 158             error("nfacct.plugin: error communicating with kernel. NFACCT plugin can only work when netdata runs as root.");
 159             goto cleanup;
 160         }
 161
 162         // --------------------------------------------------------------------
 163
 164         if(nfacct_list && nfacct_list->len) {
 165             int i;
 166
 167             if(!st_packets) {
 168                 st_packets = rrdset_create_localhost(
 169                         "netfilter"
 170                         , "nfacct_packets"
 171                         , NULL
 172                         , "nfacct"
 173                         , NULL
 174                         , "Netfilter Accounting Packets"
 175                         , "packets/s"
 176                         , 3206
 177                         , update_every
 178                         , RRDSET_TYPE_STACKED
 179                 );
 180             }
 181             else rrdset_next(st_packets);
 182
 183             for(i = 0; i < nfacct_list->len ; i++) {
 184                 if(nfacct_list->data[i].updated) {
 185                     if(unlikely(!nfacct_list->data[i].rd_packets))
 186                         nfacct_list->data[i].rd_packets = rrddim_add(
 187                                 st_packets
 188                                 , nfacct_list->data[i].name
 189                                 , NULL
 190                                 , 1
 191                                 , update_every
 192                                 , RRD_ALGORITHM_INCREMENTAL
 193                         );
 194
 195                     rrddim_set_by_pointer(
 196                             st_packets
 197                             , nfacct_list->data[i].rd_packets
 198                             , (collected_number)nfacct_list->data[i].pkts
 199                     );
 200                 }
 201             }
 202
 203             rrdset_done(st_packets);
 204
 205             // ----------------------------------------------------------------
 206
 207             st_bytes = rrdset_find_bytype_localhost("netfilter", "nfacct_bytes");
 208             if(!st_bytes) {
 209                 st_bytes = rrdset_create_localhost(
 210                         "netfilter"
 211                         , "nfacct_bytes"
 212                         , NULL
 213                         , "nfacct"
 214                         , NULL
 215                         , "Netfilter Accounting Bandwidth"
 216                         , "kilobytes/s"
 217                         , 3207
 218                         , update_every
 219                         , RRDSET_TYPE_STACKED
 220                 );
 221             }
 222             else rrdset_next(st_bytes);
 223
 224             for(i = 0; i < nfacct_list->len ; i++) {
 225                 if(nfacct_list->data[i].updated) {
 226                     if(unlikely(!nfacct_list->data[i].rd_bytes))
 227                         nfacct_list->data[i].rd_bytes = rrddim_add(
 228                                 st_bytes
 229                                 , nfacct_list->data[i].name
 230                                 , NULL
 231                                 , 1
 232                                 , 1000 * update_every
 233                                 , RRD_ALGORITHM_INCREMENTAL
 234                         );
 235
 236                     rrddim_set_by_pointer(
 237                             st_bytes
 238                             , nfacct_list->data[i].rd_bytes
 239                             , (collected_number)nfacct_list->data[i].bytes
 240                     );
 241                 }
 242             }
 243
 244             rrdset_done(st_bytes);
 245
 246
 247             // ----------------------------------------------------------------
 248             // prepare for the next loop
 249
 250             for(i = 0; i < nfacct_list->len ; i++)
 251                 nfacct_list->data[i].updated = 0;
 252         }
 253     }
 254
 255 cleanup:
 256     info("NFACCT thread exiting");
 257
 258     if(nl) mnl_socket_close(nl);
 259
 260     static_thread->enabled = 0;
 261     pthread_exit(NULL);
 262     return NULL;
 263 }
 264 #endif