VNFs/DPPD-PROX/handle_fm.c

   1 /*
   2 // Copyright (c) 2010-2017 Intel Corporation
   3 //
   4 // Licensed under the Apache License, Version 2.0 (the "License");
   5 // you may not use this file except in compliance with the License.
   6 // You may obtain a copy of the License at
   7 //
   8 //     http://www.apache.org/licenses/LICENSE-2.0
   9 //
  10 // Unless required by applicable law or agreed to in writing, software
  11 // distributed under the License is distributed on an "AS IS" BASIS,
  12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 // See the License for the specific language governing permissions and
  14 // limitations under the License.
  15 */
  16
  17 #include <dlfcn.h>
  18
  19 #include <rte_ip.h>
  20 #include <rte_udp.h>
  21 #include <rte_tcp.h>
  22 #include <rte_cycles.h>
  23 #include <rte_ether.h>
  24 #include <rte_eth_ctrl.h>
  25
  26 #include "log.h"
  27 #include "quit.h"
  28 #include "lconf.h"
  29 #include "task_init.h"
  30 #include "task_base.h"
  31 #include "kv_store_expire.h"
  32 #include "stats.h"
  33 #include "prox_shared.h"
  34 #include "etypes.h"
  35 #include "prox_cfg.h"
  36 #include "dpi/dpi.h"
  37
  38 struct task_dpi_per_core {
  39         void     *dpi_opaque;
  40 };
  41
  42 struct task_fm {
  43         struct task_base          base;
  44         /* FM related fields */
  45         struct kv_store_expire   *kv_store_expire;
  46         void                     *dpi_opaque;
  47
  48         struct dpi_engine        dpi_engine;
  49         struct task_dpi_per_core *dpi_shared; /* Used only during init */
  50 };
  51
  52 struct eth_ip4_udp {
  53         struct ether_hdr l2;
  54         struct ipv4_hdr  l3;
  55         union {
  56                 struct udp_hdr   udp;
  57                 struct tcp_hdr   tcp;
  58         } l4;
  59 } __attribute__((packed));
  60
  61 union pkt_type {
  62         struct {
  63                 uint16_t etype;
  64                 uint8_t  ip_byte;
  65                 uint8_t  next_proto;
  66         } __attribute__((packed));
  67         uint32_t val;
  68 };
  69
  70 static union pkt_type pkt_type_udp = {
  71         .next_proto = IPPROTO_UDP,
  72         .ip_byte    = 0x45,
  73         .etype      = ETYPE_IPv4,
  74 };
  75
  76 static union pkt_type pkt_type_tcp = {
  77         .next_proto = IPPROTO_TCP,
  78         .ip_byte    = 0x45,
  79         .etype      = ETYPE_IPv4,
  80 };
  81
  82 static int extract_flow_info(struct eth_ip4_udp *p, struct flow_info *fi, struct flow_info *fi_flipped, uint32_t *len, uint8_t **payload)
  83 {
  84         union pkt_type pkt_type = {
  85                 .next_proto = p->l3.next_proto_id,
  86                 .ip_byte    = p->l3.version_ihl,
  87                 .etype      = p->l2.ether_type,
  88         };
  89
  90         memset(fi->reservered, 0, sizeof(fi->reservered));
  91         memset(fi_flipped->reservered, 0, sizeof(fi_flipped->reservered));
  92
  93         if (pkt_type.val == pkt_type_udp.val) {
  94                 fi->ip_src = p->l3.src_addr;
  95                 fi->ip_dst = p->l3.dst_addr;
  96                 fi->ip_proto = p->l3.next_proto_id;
  97                 fi->port_src = p->l4.udp.src_port;
  98                 fi->port_dst = p->l4.udp.dst_port;
  99
 100                 fi_flipped->ip_src = p->l3.dst_addr;
 101                 fi_flipped->ip_dst = p->l3.src_addr;
 102                 fi_flipped->ip_proto = p->l3.next_proto_id;
 103                 fi_flipped->port_src = p->l4.udp.dst_port;
 104                 fi_flipped->port_dst = p->l4.udp.src_port;
 105
 106                 *len = rte_be_to_cpu_16(p->l4.udp.dgram_len) - sizeof(struct udp_hdr);
 107                 *payload = (uint8_t*)(&p->l4.udp) + sizeof(struct udp_hdr);
 108                 return 0;
 109         }
 110         else if (pkt_type.val == pkt_type_tcp.val) {
 111                 fi->ip_src = p->l3.src_addr;
 112                 fi->ip_dst = p->l3.dst_addr;
 113                 fi->ip_proto = p->l3.next_proto_id;
 114                 fi->port_src = p->l4.tcp.src_port;
 115                 fi->port_dst = p->l4.tcp.dst_port;
 116
 117                 fi_flipped->ip_src = p->l3.dst_addr;
 118                 fi_flipped->ip_dst = p->l3.src_addr;
 119                 fi_flipped->ip_proto = p->l3.next_proto_id;
 120                 fi_flipped->port_src = p->l4.tcp.dst_port;
 121                 fi_flipped->port_dst = p->l4.tcp.src_port;
 122
 123                 *len = rte_be_to_cpu_16(p->l3.total_length) - sizeof(struct ipv4_hdr) - ((p->l4.tcp.data_off >> 4)*4);
 124                 *payload = ((uint8_t*)&p->l4.tcp) + ((p->l4.tcp.data_off >> 4)*4);
 125                 return 0;
 126         }
 127
 128         return -1;
 129 }
 130
 131 static int is_flow_beg(const struct flow_info *fi, const struct eth_ip4_udp *p)
 132 {
 133         return fi->ip_proto == IPPROTO_UDP ||
 134                 (fi->ip_proto == IPPROTO_TCP && p->l4.tcp.tcp_flags & TCP_SYN_FLAG);
 135 }
 136
 137 static void *lookup_flow(struct task_fm *task, struct flow_info *fi, uint64_t now_tsc)
 138 {
 139         struct kv_store_expire_entry *entry;
 140
 141         entry = kv_store_expire_get(task->kv_store_expire, fi, now_tsc);
 142
 143         return entry ? entry_value(task->kv_store_expire, entry) : NULL;
 144 }
 145
 146 static void *lookup_or_insert_flow(struct task_fm *task, struct flow_info *fi, uint64_t now_tsc)
 147 {
 148         struct kv_store_expire_entry *entry;
 149
 150         entry = kv_store_expire_get_or_put(task->kv_store_expire, fi, now_tsc);
 151
 152         return entry ? entry_value(task->kv_store_expire, entry) : NULL;
 153 }
 154
 155 static int handle_fm(struct task_fm *task, struct rte_mbuf *mbuf, uint64_t now_tsc)
 156 {
 157         struct eth_ip4_udp *p;
 158         struct flow_info fi, fi_flipped;
 159         void *flow_data;
 160         uint32_t len;
 161         uint8_t *payload;
 162         uint32_t res[2];
 163         size_t res_len = 2;
 164         int flow_beg;
 165         struct dpi_payload dpi_payload;
 166         int is_upstream = 0;
 167
 168         p = rte_pktmbuf_mtod(mbuf, struct eth_ip4_udp *);
 169
 170         if (0 != extract_flow_info(p, &fi, &fi_flipped, &len, &payload)) {
 171                 plogx_err("Unknown packet type\n");
 172                 return OUT_DISCARD;
 173         }
 174
 175         /* First, try to see if the flow already exists where the
 176            current packet is sent by the server. */
 177         if (!(flow_data = lookup_flow(task, &fi_flipped, now_tsc))) {
 178                 /* Insert a new flow, only if this is the first packet
 179                    in the flow. */
 180                 is_upstream = 1;
 181                 if (is_flow_beg(&fi, p))
 182                         flow_data = lookup_or_insert_flow(task, &fi, now_tsc);
 183                 else
 184                         flow_data = lookup_flow(task, &fi, now_tsc);
 185         }
 186
 187         if (!flow_data)
 188                 return OUT_DISCARD;
 189         else if (!len)
 190                 return 0;
 191
 192         dpi_payload.payload = payload;
 193         dpi_payload.len = len;
 194         dpi_payload.client_to_server = is_upstream;
 195         gettimeofday(&dpi_payload.tv, NULL);
 196         task->dpi_engine.dpi_process(task->dpi_opaque, is_upstream? &fi : &fi_flipped, flow_data, &dpi_payload, res, &res_len);
 197         return OUT_HANDLED;
 198 }
 199
 200 static int handle_fm_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
 201 {
 202         struct task_fm *task = (struct task_fm *)tbase;
 203         uint64_t now_tsc = rte_rdtsc();
 204         uint16_t handled = 0;
 205         uint16_t discard = 0;
 206         int ret;
 207
 208         for (uint16_t i = 0; i < n_pkts; ++i) {
 209                 ret = handle_fm(task, mbufs[i], now_tsc);
 210                 if (ret == OUT_DISCARD)
 211                         discard++;
 212                 else if (ret == OUT_HANDLED)
 213                         handled++;
 214         }
 215
 216         for (uint16_t i = 0; i < n_pkts; ++i)
 217                 rte_pktmbuf_free(mbufs[i]);
 218
 219         TASK_STATS_ADD_DROP_HANDLED(&tbase->aux->stats, handled);
 220         TASK_STATS_ADD_DROP_DISCARD(&tbase->aux->stats, discard);
 221         return 0;
 222 }
 223
 224 static void load_dpi_engine(const char *dpi_engine_path, struct dpi_engine *dst)
 225 {
 226         void *handle = prox_sh_find_system(dpi_engine_path);
 227
 228         if (handle == NULL) {
 229                 plogx_info("Loading DPI engine from '%s'\n", dpi_engine_path);
 230                 handle = dlopen(dpi_engine_path, RTLD_NOW | RTLD_GLOBAL);
 231
 232                 PROX_PANIC(handle == NULL, "Failed to load dpi engine from '%s' with error:\n\t\t%s\n", dpi_engine_path, dlerror());
 233                 prox_sh_add_system(dpi_engine_path, handle);
 234         }
 235
 236         struct dpi_engine *(*get_dpi_engine)(void) = dlsym(handle, "get_dpi_engine");
 237
 238         PROX_PANIC(get_dpi_engine == NULL, "Failed to find get_dpi_engine function from '%s'\n", dpi_engine_path);
 239         struct dpi_engine *dpi_engine = get_dpi_engine();
 240
 241         dpi_engine->dpi_print = plog_info;
 242         rte_memcpy(dst, dpi_engine, sizeof(*dst));
 243 }
 244
 245 static uint32_t count_fm_cores(void)
 246 {
 247         uint32_t n_cores = 0;
 248         uint32_t lcore_id = -1;
 249         struct lcore_cfg *lconf;
 250
 251         while(prox_core_next(&lcore_id, 0) == 0) {
 252                 lconf = &lcore_cfg[lcore_id];
 253                 for (uint8_t task_id = 0; task_id < lconf->n_tasks_all; ++task_id) {
 254                         if (!strcmp(lconf->targs[task_id].task_init->mode_str, "fm")) {
 255                                 n_cores++;
 256                                 /* Only intersted in number of cores
 257                                    so break here. */
 258                                 break;
 259                         }
 260                 }
 261         }
 262
 263         return n_cores;
 264 }
 265
 266 static struct kv_store_expire *get_shared_flow_table(struct task_args *targ, struct dpi_engine *de)
 267 {
 268         struct kv_store_expire *ret = prox_sh_find_core(targ->lconf->id, "flow_table");
 269         const int socket_id = rte_lcore_to_socket_id(targ->lconf->id);
 270
 271         if (!ret) {
 272                 ret = kv_store_expire_create(rte_align32pow2(targ->flow_table_size) * 4,
 273                                              sizeof(struct flow_info),
 274                                              de->dpi_get_flow_entry_size(),
 275                                              socket_id,
 276                                              de->dpi_flow_expire,
 277                                              rte_get_tsc_hz() * 60);
 278                 PROX_PANIC(ret == NULL, "Failed to allocate KV store\n");
 279                 prox_sh_add_core(targ->lconf->id, "flow_table", ret);
 280         }
 281         return ret;
 282 }
 283
 284 static struct task_dpi_per_core *get_shared_dpi_shared(struct task_args *targ)
 285 {
 286         static const char *name = "dpi_shared";
 287         struct task_dpi_per_core *ret = prox_sh_find_core(targ->lconf->id, name);
 288         const int socket_id = rte_lcore_to_socket_id(targ->lconf->id);
 289
 290         if (!ret) {
 291                 ret = prox_zmalloc(sizeof(*ret), socket_id);
 292                 prox_sh_add_core(targ->lconf->id, name, ret);
 293         }
 294         return ret;
 295 }
 296
 297 static void init_task_fm(struct task_base *tbase, struct task_args *targ)
 298 {
 299         struct task_fm *task = (struct task_fm *)tbase;
 300         static int dpi_inited = 0;
 301
 302         load_dpi_engine(targ->dpi_engine_path, &task->dpi_engine);
 303
 304         task->kv_store_expire = get_shared_flow_table(targ, &task->dpi_engine);
 305         task->dpi_shared = get_shared_dpi_shared(targ);
 306
 307         if (!dpi_inited) {
 308                 uint32_t n_threads = count_fm_cores();
 309                 const char *dpi_params[16];
 310
 311                 plogx_info("Initializing DPI with %u threads\n", n_threads);
 312                 dpi_inited = 1;
 313
 314                 PROX_PANIC(targ->n_dpi_engine_args > 16, "Too many DPI arguments");
 315                 for (size_t i = 0; i < targ->n_dpi_engine_args && i < 16; ++i)
 316                         dpi_params[i] = targ->dpi_engine_args[i];
 317
 318                 int ret = task->dpi_engine.dpi_init(n_threads, targ->n_dpi_engine_args, dpi_params);
 319
 320                 PROX_PANIC(ret, "Failed to initialize DPI engine\n");
 321         }
 322 }
 323
 324 static void start_first(struct task_base *tbase)
 325 {
 326         struct task_fm *task = (struct task_fm *)tbase;
 327         void *ret = task->dpi_engine.dpi_thread_start();
 328
 329         task->dpi_shared->dpi_opaque = ret;
 330         PROX_PANIC(ret == NULL, "dpi_thread_init failed\n");
 331 }
 332
 333 static void start(struct task_base *tbase)
 334 {
 335         struct task_fm *task = (struct task_fm *)tbase;
 336
 337         task->dpi_opaque = task->dpi_shared->dpi_opaque;
 338         PROX_PANIC(task->dpi_opaque == NULL, "dpi_opaque == NULL");
 339 }
 340
 341 static void stop(struct task_base *tbase)
 342 {
 343         struct task_fm *task = (struct task_fm *)tbase;
 344
 345         size_t expired = kv_store_expire_expire_all(task->kv_store_expire);
 346         size_t size = kv_store_expire_size(task->kv_store_expire);
 347
 348         plogx_info("%zu/%zu\n", expired, size);
 349 }
 350
 351 static void stop_last(struct task_base *tbase)
 352 {
 353         struct task_fm *task = (struct task_fm *)tbase;
 354
 355         task->dpi_engine.dpi_thread_stop(task->dpi_shared->dpi_opaque);
 356         task->dpi_shared->dpi_opaque = NULL;
 357 }
 358
 359 static struct task_init task_init_fm = {
 360         .mode_str = "fm",
 361         .init = init_task_fm,
 362         .handle = handle_fm_bulk,
 363         .start = start,
 364         .stop = stop,
 365         .start_first = start_first,
 366         .stop_last = stop_last,
 367         .size = sizeof(struct task_fm)
 368 };
 369
 370 __attribute__((constructor)) static void reg_task_fm(void)
 371 {
 372         reg_task(&task_init_fm);
 373 }