1 /* SPDX-License-Identifier: Apache-2.0
2 * Copyright(c) 2021 Cisco Systems, Inc.
6 #include <vnet/plugin/plugin.h>
7 #include <vpp/app/version.h>
8 #include <snort/snort.h>
10 #include <sys/eventfd.h>
12 snort_main_t snort_main;
14 VLIB_REGISTER_LOG_CLASS (snort_log, static) = {
15 .class_name = "snort",
16 .default_syslog_level = VLIB_LOG_LEVEL_DEBUG,
19 #define log_debug(fmt, ...) vlib_log_debug (snort_log.class, fmt, __VA_ARGS__)
20 #define log_err(fmt, ...) vlib_log_err (snort_log.class, fmt, __VA_ARGS__)
23 snort_client_disconnect (clib_file_t *uf)
25 vlib_main_t *vm = vlib_get_main ();
27 snort_main_t *sm = &snort_main;
28 snort_client_t *c = pool_elt_at_index (sm->clients, uf->private_data);
30 if (c->instance_index != ~0)
32 snort_per_thread_data_t *ptd =
33 vec_elt_at_index (sm->per_thread_data, vm->thread_index);
34 snort_instance_t *si =
35 pool_elt_at_index (sm->instances, c->instance_index);
36 vec_foreach (qp, si->qpairs)
37 __atomic_store_n (&qp->ready, 1, __ATOMIC_RELEASE);
39 si->client_index = ~0;
40 clib_interrupt_set (ptd->interrupts, uf->private_data);
41 vlib_node_set_interrupt_pending (vm, snort_deq_node.index);
44 clib_file_del (&file_main, uf);
45 clib_socket_close (&c->socket);
46 pool_put (sm->clients, c);
49 static snort_instance_t *
50 snort_get_instance_by_name (char *name)
52 snort_main_t *sm = &snort_main;
54 if ((p = hash_get_mem (sm->instance_by_name, name)) == 0)
57 return vec_elt_at_index (sm->instances, p[0]);
62 snort_conn_fd_read_ready (clib_file_t *uf)
64 vlib_main_t *vm = vlib_get_main ();
65 snort_main_t *sm = &snort_main;
66 snort_client_t *c = pool_elt_at_index (sm->clients, uf->private_data);
67 vlib_buffer_pool_t *bp;
70 snort_client_msg_queue_elt *e;
76 log_debug ("fd_read_ready: client %u", uf->private_data);
78 if ((err = clib_socket_recvmsg (&c->socket, &msg, sizeof (msg), 0, 0)))
80 log_err ("client recvmsg error: %U", format_clib_error, err);
81 snort_client_disconnect (uf);
82 clib_error_free (err);
86 if (msg.type != DAQ_VPP_MSG_TYPE_HELLO)
88 log_err ("unexpeced message recieved from client", 0);
89 snort_client_disconnect (uf);
93 msg.hello.inst_name[DAQ_VPP_INST_NAME_LEN - 1] = 0;
94 name = msg.hello.inst_name;
96 log_debug ("fd_read_ready: connect instance %s", name);
98 if ((si = snort_get_instance_by_name (name)) == 0)
100 log_err ("unknown instance '%s' requested by client", name);
101 snort_client_disconnect (uf);
105 vec_foreach (qp, si->qpairs)
107 u32 ready = __atomic_load_n (&qp->ready, __ATOMIC_ACQUIRE);
110 log_err ("instance '%s' is not ready to accept connections", name);
111 snort_client_disconnect (uf);
116 base = (u8 *) si->shm_base;
118 if (si->client_index != ~0)
120 log_err ("client already connected to instance '%s'", name);
121 snort_client_disconnect (uf);
124 si->client_index = uf->private_data;
125 c->instance_index = si->index;
127 log_debug ("fd_read_ready: connect instance index %u", si->index);
129 clib_fifo_add2 (c->msg_queue, e);
130 e->msg.type = DAQ_VPP_MSG_TYPE_CONFIG;
131 e->msg.config.num_bpools = vec_len (vm->buffer_main->buffer_pools);
132 e->msg.config.num_qpairs = vec_len (si->qpairs);
133 e->msg.config.shm_size = si->shm_size;
134 e->fds[0] = si->shm_fd;
137 vec_foreach (bp, vm->buffer_main->buffer_pools)
139 vlib_physmem_map_t *pm;
140 pm = vlib_physmem_get_map (vm, bp->physmem_map_index);
141 clib_fifo_add2 (c->msg_queue, e);
142 e->msg.type = DAQ_VPP_MSG_TYPE_BPOOL;
143 e->msg.bpool.size = pm->n_pages << pm->log2_page_size;
148 vec_foreach (qp, si->qpairs)
150 clib_fifo_add2 (c->msg_queue, e);
151 e->msg.type = DAQ_VPP_MSG_TYPE_QPAIR;
152 e->msg.qpair.log2_queue_size = qp->log2_queue_size;
153 e->msg.qpair.desc_table_offset = (u8 *) qp->descriptors - base;
154 e->msg.qpair.enq_ring_offset = (u8 *) qp->enq_ring - base;
155 e->msg.qpair.deq_ring_offset = (u8 *) qp->deq_ring - base;
156 e->msg.qpair.enq_head_offset = (u8 *) qp->enq_head - base;
157 e->msg.qpair.deq_head_offset = (u8 *) qp->deq_head - base;
158 e->fds[0] = qp->enq_fd;
159 e->fds[1] = qp->deq_fd;
163 clib_file_set_data_available_to_write (&file_main, c->file_index, 1);
167 static clib_error_t *
168 snort_conn_fd_write_ready (clib_file_t *uf)
170 snort_main_t *sm = &snort_main;
171 snort_client_t *c = pool_elt_at_index (sm->clients, uf->private_data);
172 snort_client_msg_queue_elt *e;
174 log_debug ("fd_write_ready: client %u", uf->private_data);
175 clib_fifo_sub2 (c->msg_queue, e);
177 if (clib_fifo_elts (c->msg_queue) == 0)
178 clib_file_set_data_available_to_write (&file_main, c->file_index, 0);
180 return clib_socket_sendmsg (&c->socket, &e->msg, sizeof (*e), e->fds,
185 snort_conn_fd_error (clib_file_t *uf)
187 log_debug ("fd_error: client %u", uf->private_data);
191 static clib_error_t *
192 snort_deq_ready (clib_file_t *uf)
194 vlib_main_t *vm = vlib_get_main ();
195 snort_main_t *sm = &snort_main;
196 snort_per_thread_data_t *ptd =
197 vec_elt_at_index (sm->per_thread_data, vm->thread_index);
200 if (read (uf->file_descriptor, &counter, sizeof (counter)) < 0)
201 return clib_error_return (0, "client closed socket");
203 clib_interrupt_set (ptd->interrupts, uf->private_data);
204 vlib_node_set_interrupt_pending (vm, snort_deq_node.index);
208 static clib_error_t *
209 snort_conn_fd_accept_ready (clib_file_t *uf)
211 snort_main_t *sm = &snort_main;
214 clib_error_t *err = 0;
215 clib_file_t t = { 0 };
217 pool_get_zero (sm->clients, c);
218 c->instance_index = ~0;
221 if ((err = clib_socket_accept (sm->listener, s)))
223 log_err ("%U", format_clib_error, err);
224 pool_put (sm->clients, c);
228 t.read_function = snort_conn_fd_read_ready;
229 t.write_function = snort_conn_fd_write_ready;
230 t.error_function = snort_conn_fd_error;
231 t.file_descriptor = s->fd;
232 t.private_data = c - sm->clients;
233 t.description = format (0, "snort client");
234 c->file_index = clib_file_add (&file_main, &t);
236 log_debug ("snort_conn_fd_accept_ready: client %u", t.private_data);
240 static clib_error_t *
241 snort_listener_init (vlib_main_t *vm)
243 snort_main_t *sm = &snort_main;
245 clib_file_t t = { 0 };
251 s = clib_mem_alloc (sizeof (clib_socket_t));
252 clib_memset (s, 0, sizeof (clib_socket_t));
253 s->config = (char *) sm->socket_name;
254 s->flags = CLIB_SOCKET_F_IS_SERVER | CLIB_SOCKET_F_ALLOW_GROUP_WRITE |
255 CLIB_SOCKET_F_SEQPACKET | CLIB_SOCKET_F_PASSCRED;
257 if ((err = clib_socket_init (s)))
263 t.read_function = snort_conn_fd_accept_ready;
264 t.file_descriptor = s->fd;
265 t.description = format (0, "snort listener %s", s->config);
266 log_debug ("%v", t.description);
267 clib_file_add (&file_main, &t);
275 snort_instance_create (vlib_main_t *vm, char *name, u8 log2_queue_sz,
276 u8 drop_on_disconnect)
278 vlib_thread_main_t *tm = vlib_get_thread_main ();
279 snort_main_t *sm = &snort_main;
280 snort_instance_t *si;
281 clib_error_t *err = 0;
283 u8 *base = CLIB_MEM_VM_MAP_FAILED;
286 u32 qpair_mem_sz = 0;
287 u32 qsz = 1 << log2_queue_sz;
288 u8 align = CLIB_CACHE_LINE_BYTES;
290 if (snort_get_instance_by_name (name))
291 return clib_error_return (0, "instance already exists");
293 /* descriptor table */
294 qpair_mem_sz += round_pow2 (qsz * sizeof (daq_vpp_desc_t), align);
296 /* enq and deq ring */
297 qpair_mem_sz += 2 * round_pow2 (qsz * sizeof (u32), align);
299 /* enq and deq head pointer */
300 qpair_mem_sz += 2 * round_pow2 (sizeof (u32), align);
303 round_pow2 (tm->n_vlib_mains * qpair_mem_sz, clib_mem_get_page_size ());
304 fd = clib_mem_vm_create_fd (CLIB_MEM_PAGE_SZ_DEFAULT, "snort instance %s",
309 err = clib_error_return (0, "memory fd failure: %U", format_clib_error,
310 clib_mem_get_last_error ());
314 if ((ftruncate (fd, size)) == -1)
316 err = clib_error_return (0, "ftruncate failure");
320 base = clib_mem_vm_map_shared (0, size, fd, 0, "snort instance %s", name);
322 if (base == CLIB_MEM_VM_MAP_FAILED)
324 err = clib_error_return (0, "mmap failure");
328 pool_get_zero (sm->instances, si);
329 si->index = si - sm->instances;
330 si->client_index = ~0;
334 si->name = format (0, "%s%c", name, 0);
335 si->drop_on_disconnect = drop_on_disconnect;
336 index = si - sm->instances;
337 hash_set_mem (sm->instance_by_name, si->name, index);
339 log_debug ("instnce '%s' createed with fd %d at %p, len %u", name, fd, base,
342 vec_validate_aligned (sm->per_thread_data, tm->n_vlib_mains - 1,
343 CLIB_CACHE_LINE_BYTES);
344 vec_validate_aligned (si->qpairs, tm->n_vlib_mains - 1,
345 CLIB_CACHE_LINE_BYTES);
347 for (int i = 0; i < tm->n_vlib_mains; i++)
349 snort_qpair_t *qp = vec_elt_at_index (si->qpairs, i);
350 snort_per_thread_data_t *ptd = vec_elt_at_index (sm->per_thread_data, i);
351 clib_file_t t = { 0 };
353 qp->log2_queue_size = log2_queue_sz;
354 qp->descriptors = (void *) base;
355 base += round_pow2 (qsz * sizeof (daq_vpp_desc_t), align);
356 qp->enq_ring = (void *) base;
357 base += round_pow2 (qsz * sizeof (u32), align);
358 qp->deq_ring = (void *) base;
359 base += round_pow2 (qsz * sizeof (u32), align);
360 qp->enq_head = (void *) base;
361 base += round_pow2 (sizeof (u32), align);
362 qp->deq_head = (void *) base;
363 base += round_pow2 (sizeof (u32), align);
364 qp->enq_fd = eventfd (0, EFD_NONBLOCK);
365 qp->deq_fd = eventfd (0, EFD_NONBLOCK);
366 vec_validate_aligned (qp->buffer_indices, qsz - 1,
367 CLIB_CACHE_LINE_BYTES);
368 vec_validate_aligned (qp->next_indices, qsz - 1, CLIB_CACHE_LINE_BYTES);
369 clib_memset_u32 (qp->buffer_indices, ~0, qsz);
371 /* pre-populate freelist */
372 vec_validate_aligned (qp->freelist, qsz - 1, CLIB_CACHE_LINE_BYTES);
373 snort_freelist_init (qp->freelist);
375 /* listen on dequeue events */
376 t.read_function = snort_deq_ready;
377 t.file_descriptor = qp->deq_fd;
378 t.private_data = si->index;
380 format (0, "snort dequeue for instance '%s' qpair %u", si->name, i);
381 qp->deq_fd_file_index = clib_file_add (&file_main, &t);
383 clib_file_set_polling_thread (&file_main, qp->deq_fd_file_index, i);
384 clib_interrupt_resize (&ptd->interrupts, vec_len (sm->instances));
387 for (i = 0; i < vlib_get_n_threads (); i++)
388 vlib_node_set_state (vlib_get_main_by_index (i), snort_deq_node.index,
389 VLIB_NODE_STATE_INTERRUPT);
394 if (base != CLIB_MEM_VM_MAP_FAILED)
395 clib_mem_vm_unmap (base);
403 snort_interface_enable_disable (vlib_main_t *vm, char *instance_name,
404 u32 sw_if_index, int is_enable)
406 snort_main_t *sm = &snort_main;
407 vnet_main_t *vnm = vnet_get_main ();
408 snort_instance_t *si;
409 clib_error_t *err = 0;
414 if ((si = snort_get_instance_by_name (instance_name)) == 0)
416 err = clib_error_return (0, "unknown instance '%s'", instance_name);
420 vec_validate_init_empty (sm->instance_by_sw_if_index, sw_if_index, ~0);
422 index = sm->instance_by_sw_if_index[sw_if_index];
425 si = vec_elt_at_index (sm->instances, index);
426 err = clib_error_return (0,
427 "interface %U already assgined to "
429 format_vnet_sw_if_index_name, vnm,
430 sw_if_index, si->name);
434 index = sm->instance_by_sw_if_index[sw_if_index] = si->index;
435 vnet_feature_enable_disable ("ip4-unicast", "snort-enq", sw_if_index, 1,
436 &index, sizeof (index));
440 if (sw_if_index >= vec_len (sm->instance_by_sw_if_index) ||
441 sm->instance_by_sw_if_index[sw_if_index] == ~0)
444 clib_error_return (0,
445 "interface %U is not assigned to snort "
447 format_vnet_sw_if_index_name, vnm, sw_if_index);
450 index = sm->instance_by_sw_if_index[sw_if_index];
451 si = vec_elt_at_index (sm->instances, index);
453 sm->instance_by_sw_if_index[sw_if_index] = ~0;
454 vnet_feature_enable_disable ("ip4-unicast", "snort-enq", sw_if_index, 0,
455 &index, sizeof (index));
460 log_err ("%U", format_clib_error, err);
465 snort_set_node_mode (vlib_main_t *vm, u32 mode)
468 snort_main.input_mode = mode;
469 for (i = 0; i < vlib_get_n_threads (); i++)
470 vlib_node_set_state (vlib_get_main_by_index (i), snort_deq_node.index,
476 snort_set_default_socket (snort_main_t *sm, u8 *socket_name)
482 socket_name = (u8 *) DAQ_VPP_DEFAULT_SOCKET_FILE;
485 format (0, "%s/%s", vlib_unix_get_runtime_dir (), socket_name);
486 vec_terminate_c_string (sm->socket_name);
489 static clib_error_t *
490 snort_init (vlib_main_t *vm)
492 snort_main_t *sm = &snort_main;
493 sm->instance_by_name = hash_create_string (0, sizeof (uword));
494 vlib_buffer_pool_t *bp;
496 vec_foreach (bp, vm->buffer_main->buffer_pools)
498 vlib_physmem_map_t *pm =
499 vlib_physmem_get_map (vm, bp->physmem_map_index);
500 vec_add1 (sm->buffer_pool_base_addrs, pm->base);
503 if (!sm->socket_name)
504 snort_set_default_socket (sm, 0);
506 return snort_listener_init (vm);
509 VLIB_INIT_FUNCTION (snort_init);
511 VLIB_PLUGIN_REGISTER () = {
512 .version = VPP_BUILD_VER,
513 .description = "Snort",
516 VNET_FEATURE_INIT (snort_enq, static) = {
517 .arc_name = "ip4-unicast",
518 .node_name = "snort-enq",
519 .runs_before = VNET_FEATURES ("ip4-lookup"),