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         if(unlikely(!nfacct_list))
  58             nfacct_list_grow();
  59     }
  60
  61     if(nfacct_nlmsg_parse_payload(nlh, nfacct) < 0) {
  62         error("nfacct.plugin: nfacct_nlmsg_parse_payload() failed.");
  63         return MNL_CB_OK;
  64     }
  65
  66     const char *name = nfacct_attr_get_str(nfacct, NFACCT_ATTR_NAME);
  67     uint32_t hash = simple_hash(name);
  68
  69     int i;
  70     struct mynfacct *mynfacct = NULL;
  71     for(i = 0; i < nfacct_list->len; i++) {
  72         if(nfacct_list->data[i].hash == hash && !strcmp(nfacct_list->data[i].name, name)) {
  73             mynfacct = &nfacct_list->data[i];
  74             break;
  75         }
  76     }
  77
  78     if(!mynfacct) {
  79         nfacct_list_grow();
  80         mynfacct = &nfacct_list->data[nfacct_list->len++];
  81         mynfacct->name = name;
  82         mynfacct->hash = hash;
  83     }
  84
  85     mynfacct->pkts  = nfacct_attr_get_u64(nfacct, NFACCT_ATTR_PKTS);
  86     mynfacct->bytes = nfacct_attr_get_u64(nfacct, NFACCT_ATTR_BYTES);
  87     mynfacct->updated = 1;
  88
  89     nfacct_list->len++;
  90     return MNL_CB_OK;
  91 }
  92
  93 void *nfacct_main(void *ptr) {
  94     struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
  95
  96     info("NFACCT thread created with task id %d", gettid());
  97
  98     if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
  99         error("nfacct.plugin: Cannot set pthread cancel type to DEFERRED.");
 100
 101     if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 102         error("nfacct.plugin: Cannot set pthread cancel state to ENABLE.");
 103
 104     char buf[MNL_SOCKET_BUFFER_SIZE];
 105     struct mnl_socket *nl = NULL;
 106     struct nlmsghdr *nlh = NULL;
 107     unsigned int seq = 0, portid = 0;
 108
 109     seq = (unsigned int)now_realtime_sec() - 1;
 110
 111     nl  = mnl_socket_open(NETLINK_NETFILTER);
 112     if(!nl) {
 113         error("nfacct.plugin: mnl_socket_open() failed");
 114         goto cleanup;
 115     }
 116
 117     if(mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
 118         error("nfacct.plugin: mnl_socket_bind() failed");
 119         goto cleanup;
 120     }
 121     portid = mnl_socket_get_portid(nl);
 122
 123     // ------------------------------------------------------------------------
 124
 125     RRDSET *st_bytes = NULL, *st_packets = NULL;
 126
 127     // ------------------------------------------------------------------------
 128
 129     int update_every = (int)config_get_number("plugin:nfacct", "update every", localhost->rrd_update_every);
 130     if(update_every < localhost->rrd_update_every)
 131         update_every = localhost->rrd_update_every;
 132
 133     usec_t step = update_every * USEC_PER_SEC;
 134     heartbeat_t hb;
 135     heartbeat_init(&hb);
 136     for(;;) {
 137         heartbeat_dt_usec(&hb);
 138         heartbeat_next(&hb, step);
 139
 140         if(unlikely(netdata_exit)) break;
 141
 142         seq++;
 143
 144         nlh = nfacct_nlmsg_build_hdr(buf, NFNL_MSG_ACCT_GET, NLM_F_DUMP, (uint32_t)seq);
 145         if(!nlh) {
 146             error("nfacct.plugin: nfacct_nlmsg_build_hdr() failed");
 147             goto cleanup;
 148         }
 149
 150         if(mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
 151             error("nfacct.plugin: mnl_socket_send");
 152             goto cleanup;
 153         }
 154
 155         ssize_t ret;
 156         while((ret = mnl_socket_recvfrom(nl, buf, sizeof(buf))) > 0) {
 157             if((ret = mnl_cb_run(buf, (size_t)ret, seq, portid, nfacct_callback, NULL)) <= 0) break;
 158         }
 159
 160         if (ret == -1) {
 161             error("nfacct.plugin: error communicating with kernel. NFACCT plugin can only work when netdata runs as root.");
 162             goto cleanup;
 163         }
 164
 165         // --------------------------------------------------------------------
 166
 167         if(nfacct_list && nfacct_list->len) {
 168             int i;
 169
 170             if(!st_packets) {
 171                 st_packets = rrdset_create_localhost(
 172                         "netfilter"
 173                         , "nfacct_packets"
 174                         , NULL
 175                         , "nfacct"
 176                         , NULL
 177                         , "Netfilter Accounting Packets"
 178                         , "packets/s"
 179                         , 3206
 180                         , update_every
 181                         , RRDSET_TYPE_STACKED
 182                 );
 183             }
 184             else rrdset_next(st_packets);
 185
 186             for(i = 0; i < nfacct_list->len ; i++) {
 187                 if(nfacct_list->data[i].updated) {
 188                     if(unlikely(!nfacct_list->data[i].rd_packets))
 189                         nfacct_list->data[i].rd_packets = rrddim_add(
 190                                 st_packets
 191                                 , nfacct_list->data[i].name
 192                                 , NULL
 193                                 , 1
 194                                 , update_every
 195                                 , RRD_ALGORITHM_INCREMENTAL
 196                         );
 197
 198                     rrddim_set_by_pointer(
 199                             st_packets
 200                             , nfacct_list->data[i].rd_packets
 201                             , (collected_number)nfacct_list->data[i].pkts
 202                     );
 203                 }
 204             }
 205
 206             rrdset_done(st_packets);
 207
 208             // ----------------------------------------------------------------
 209
 210             st_bytes = rrdset_find_bytype_localhost("netfilter", "nfacct_bytes");
 211             if(!st_bytes) {
 212                 st_bytes = rrdset_create_localhost(
 213                         "netfilter"
 214                         , "nfacct_bytes"
 215                         , NULL
 216                         , "nfacct"
 217                         , NULL
 218                         , "Netfilter Accounting Bandwidth"
 219                         , "kilobytes/s"
 220                         , 3207
 221                         , update_every
 222                         , RRDSET_TYPE_STACKED
 223                 );
 224             }
 225             else rrdset_next(st_bytes);
 226
 227             for(i = 0; i < nfacct_list->len ; i++) {
 228                 if(nfacct_list->data[i].updated) {
 229                     if(unlikely(!nfacct_list->data[i].rd_bytes))
 230                         nfacct_list->data[i].rd_bytes = rrddim_add(
 231                                 st_bytes
 232                                 , nfacct_list->data[i].name
 233                                 , NULL
 234                                 , 1
 235                                 , 1000 * update_every
 236                                 , RRD_ALGORITHM_INCREMENTAL
 237                         );
 238
 239                     rrddim_set_by_pointer(
 240                             st_bytes
 241                             , nfacct_list->data[i].rd_bytes
 242                             , (collected_number)nfacct_list->data[i].bytes
 243                     );
 244                 }
 245             }
 246
 247             rrdset_done(st_bytes);
 248
 249
 250             // ----------------------------------------------------------------
 251             // prepare for the next loop
 252
 253             for(i = 0; i < nfacct_list->len ; i++)
 254                 nfacct_list->data[i].updated = 0;
 255         }
 256     }
 257
 258 cleanup:
 259     info("NFACCT thread exiting");
 260
 261     if(nl) mnl_socket_close(nl);
 262
 263     static_thread->enabled = 0;
 264     pthread_exit(NULL);
 265     return NULL;
 266 }
 267 #endif