2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * Defines used for testing various optimisation schemes
18 #define MAP_ENCAP_DUAL 0
21 #include "../ip/ip_frag.h"
22 #include <vnet/ip/ip4_to_ip6.h>
24 vlib_node_registration_t ip4_map_reass_node;
28 IP4_MAP_NEXT_IP6_LOOKUP,
29 #ifdef MAP_SKIP_IP6_LOOKUP
30 IP4_MAP_NEXT_IP6_REWRITE,
32 IP4_MAP_NEXT_IP4_FRAGMENT,
33 IP4_MAP_NEXT_IP6_FRAGMENT,
35 IP4_MAP_NEXT_ICMP_ERROR,
40 enum ip4_map_reass_next_t
42 IP4_MAP_REASS_NEXT_IP6_LOOKUP,
43 IP4_MAP_REASS_NEXT_IP4_FRAGMENT,
44 IP4_MAP_REASS_NEXT_DROP,
53 } map_ip4_map_reass_trace_t;
56 format_ip4_map_reass_trace (u8 * s, va_list * args)
58 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
59 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
60 map_ip4_map_reass_trace_t *t = va_arg (*args, map_ip4_map_reass_trace_t *);
61 return format (s, "MAP domain index: %d L4 port: %u Status: %s",
62 t->map_domain_index, t->port,
63 t->cached ? "cached" : "forwarded");
66 static_always_inline u16
67 ip4_map_port_and_security_check (map_domain_t * d, ip4_header_t * ip,
68 u32 * next, u8 * error)
72 if (d->psid_length > 0)
74 if (ip4_get_fragment_offset (ip) == 0)
77 ((ip->ip_version_and_header_length != 0x45)
78 || clib_host_to_net_u16 (ip->length) < 28))
82 port = ip4_get_port (ip, 0);
85 /* Verify that port is not among the well-known ports */
86 if ((d->psid_offset > 0)
87 && (clib_net_to_host_u16 (port) <
88 (0x1 << (16 - d->psid_offset))))
90 *error = MAP_ERROR_ENCAP_SEC_CHECK;
94 if (ip4_get_fragment_more (ip))
95 *next = IP4_MAP_NEXT_REASS;
101 *error = MAP_ERROR_BAD_PROTOCOL;
106 *next = IP4_MAP_NEXT_REASS;
115 static_always_inline u32
116 ip4_map_vtcfl (ip4_header_t * ip4, vlib_buffer_t * p)
118 map_main_t *mm = &map_main;
119 u8 tc = mm->tc_copy ? ip4->tos : mm->tc;
120 u32 vtcfl = 0x6 << 28;
122 vtcfl |= vnet_buffer (p)->ip.flow_hash & 0x000fffff;
124 return (clib_host_to_net_u32 (vtcfl));
127 static_always_inline bool
128 ip4_map_ip6_lookup_bypass (vlib_buffer_t * p0, ip4_header_t * ip)
130 #ifdef MAP_SKIP_IP6_LOOKUP
131 if (FIB_NODE_INDEX_INVALID != pre_resolved[FIB_PROTOCOL_IP6].fei)
133 vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
134 pre_resolved[FIB_PROTOCOL_IP6].dpo.dpoi_index;
145 ip4_map_decrement_ttl (ip4_header_t * ip, u8 * error)
149 /* Input node should have reject packets with ttl 0. */
150 ASSERT (ip->ttl > 0);
152 u32 checksum = ip->checksum + clib_host_to_net_u16 (0x0100);
153 checksum += checksum >= 0xffff;
154 ip->checksum = checksum;
157 *error = ttl <= 0 ? IP4_ERROR_TIME_EXPIRED : *error;
159 /* Verify checksum. */
160 ASSERT (ip->checksum == ip4_header_checksum (ip));
164 ip4_map_fragment (vlib_buffer_t * b, u16 mtu, bool df, u8 * error)
166 map_main_t *mm = &map_main;
170 ip_frag_set_vnet_buffer (b, sizeof (ip6_header_t), mtu,
171 IP4_FRAG_NEXT_IP6_LOOKUP,
172 IP_FRAG_FLAG_IP6_HEADER);
173 return (IP4_MAP_NEXT_IP4_FRAGMENT);
177 if (df && !mm->frag_ignore_df)
179 icmp4_error_set_vnet_buffer (b, ICMP4_destination_unreachable,
180 ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
182 vlib_buffer_advance (b, sizeof (ip6_header_t));
183 *error = MAP_ERROR_DF_SET;
184 return (IP4_MAP_NEXT_ICMP_ERROR);
186 ip_frag_set_vnet_buffer (b, 0, mtu, IP6_FRAG_NEXT_IP6_LOOKUP,
187 IP_FRAG_FLAG_IP6_HEADER);
188 return (IP4_MAP_NEXT_IP6_FRAGMENT);
196 ip4_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
198 u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
199 vlib_node_runtime_t *error_node =
200 vlib_node_get_runtime (vm, ip4_map_node.index);
201 from = vlib_frame_vector_args (frame);
202 n_left_from = frame->n_vectors;
203 next_index = node->cached_next_index;
204 map_main_t *mm = &map_main;
205 vlib_combined_counter_main_t *cm = mm->domain_counters;
206 u32 thread_index = vlib_get_thread_index ();
208 while (n_left_from > 0)
210 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
213 while (n_left_from >= 4 && n_left_to_next >= 2)
216 vlib_buffer_t *p0, *p1;
217 map_domain_t *d0, *d1;
218 u8 error0 = MAP_ERROR_NONE, error1 = MAP_ERROR_NONE;
219 ip4_header_t *ip40, *ip41;
220 u16 port0 = 0, port1 = 0;
221 ip6_header_t *ip6h0, *ip6h1;
222 u32 map_domain_index0 = ~0, map_domain_index1 = ~0;
223 u32 next0 = IP4_MAP_NEXT_IP6_LOOKUP, next1 =
224 IP4_MAP_NEXT_IP6_LOOKUP;
226 /* Prefetch next iteration. */
228 vlib_buffer_t *p2, *p3;
230 p2 = vlib_get_buffer (vm, from[2]);
231 p3 = vlib_get_buffer (vm, from[3]);
233 vlib_prefetch_buffer_header (p2, STORE);
234 vlib_prefetch_buffer_header (p3, STORE);
235 /* IPv4 + 8 = 28. possibly plus -40 */
236 CLIB_PREFETCH (p2->data - 40, 68, STORE);
237 CLIB_PREFETCH (p3->data - 40, 68, STORE);
240 pi0 = to_next[0] = from[0];
241 pi1 = to_next[1] = from[1];
247 p0 = vlib_get_buffer (vm, pi0);
248 p1 = vlib_get_buffer (vm, pi1);
249 ip40 = vlib_buffer_get_current (p0);
250 ip41 = vlib_buffer_get_current (p1);
251 map_domain_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
252 d0 = ip4_map_get_domain (map_domain_index0);
253 map_domain_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
254 d1 = ip4_map_get_domain (map_domain_index1);
259 * Shared IPv4 address
261 port0 = ip4_map_port_and_security_check (d0, ip40, &next0, &error0);
262 port1 = ip4_map_port_and_security_check (d1, ip41, &next1, &error1);
264 /* Decrement IPv4 TTL */
265 ip4_map_decrement_ttl (ip40, &error0);
266 ip4_map_decrement_ttl (ip41, &error1);
268 ip40->flags_and_fragment_offset &
269 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT);
271 ip41->flags_and_fragment_offset &
272 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT);
275 u32 da40 = clib_net_to_host_u32 (ip40->dst_address.as_u32);
276 u32 da41 = clib_net_to_host_u32 (ip41->dst_address.as_u32);
277 u16 dp40 = clib_net_to_host_u16 (port0);
278 u16 dp41 = clib_net_to_host_u16 (port1);
279 u64 dal60 = map_get_pfx (d0, da40, dp40);
280 u64 dal61 = map_get_pfx (d1, da41, dp41);
281 u64 dar60 = map_get_sfx (d0, da40, dp40);
282 u64 dar61 = map_get_sfx (d1, da41, dp41);
283 if (dal60 == 0 && dar60 == 0 && error0 == MAP_ERROR_NONE
284 && next0 != IP4_MAP_NEXT_REASS)
285 error0 = MAP_ERROR_NO_BINDING;
286 if (dal61 == 0 && dar61 == 0 && error1 == MAP_ERROR_NONE
287 && next1 != IP4_MAP_NEXT_REASS)
288 error1 = MAP_ERROR_NO_BINDING;
290 /* construct ipv6 header */
291 vlib_buffer_advance (p0, -sizeof (ip6_header_t));
292 vlib_buffer_advance (p1, -sizeof (ip6_header_t));
293 ip6h0 = vlib_buffer_get_current (p0);
294 ip6h1 = vlib_buffer_get_current (p1);
295 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
296 vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
298 ip6h0->ip_version_traffic_class_and_flow_label =
299 ip4_map_vtcfl (ip40, p0);
300 ip6h1->ip_version_traffic_class_and_flow_label =
301 ip4_map_vtcfl (ip41, p1);
302 ip6h0->payload_length = ip40->length;
303 ip6h1->payload_length = ip41->length;
304 ip6h0->protocol = IP_PROTOCOL_IP_IN_IP;
305 ip6h1->protocol = IP_PROTOCOL_IP_IN_IP;
306 ip6h0->hop_limit = 0x40;
307 ip6h1->hop_limit = 0x40;
308 ip6h0->src_address = d0->ip6_src;
309 ip6h1->src_address = d1->ip6_src;
310 ip6h0->dst_address.as_u64[0] = clib_host_to_net_u64 (dal60);
311 ip6h0->dst_address.as_u64[1] = clib_host_to_net_u64 (dar60);
312 ip6h1->dst_address.as_u64[0] = clib_host_to_net_u64 (dal61);
313 ip6h1->dst_address.as_u64[1] = clib_host_to_net_u64 (dar61);
316 * Determine next node. Can be one of:
317 * ip6-lookup, ip6-rewrite, ip4-fragment, ip4-virtreass, error-drop
319 if (PREDICT_TRUE (error0 == MAP_ERROR_NONE))
323 && (clib_net_to_host_u16 (ip6h0->payload_length) +
324 sizeof (*ip6h0) > d0->mtu)))
326 next0 = ip4_map_fragment (p0, d0->mtu, df0, &error0);
331 ip4_map_ip6_lookup_bypass (p0,
333 IP4_MAP_NEXT_IP6_REWRITE : next0;
334 vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
336 map_domain_index0, 1,
338 (ip6h0->payload_length) +
344 next0 = IP4_MAP_NEXT_DROP;
348 * Determine next node. Can be one of:
349 * ip6-lookup, ip6-rewrite, ip4-fragment, ip4-virtreass, error-drop
351 if (PREDICT_TRUE (error1 == MAP_ERROR_NONE))
355 && (clib_net_to_host_u16 (ip6h1->payload_length) +
356 sizeof (*ip6h1) > d1->mtu)))
358 next1 = ip4_map_fragment (p1, d1->mtu, df1, &error1);
363 ip4_map_ip6_lookup_bypass (p1,
365 IP4_MAP_NEXT_IP6_REWRITE : next1;
366 vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
368 map_domain_index1, 1,
370 (ip6h1->payload_length) +
376 next1 = IP4_MAP_NEXT_DROP;
379 if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
381 map_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
382 tr->map_domain_index = map_domain_index0;
385 if (PREDICT_FALSE (p1->flags & VLIB_BUFFER_IS_TRACED))
387 map_trace_t *tr = vlib_add_trace (vm, node, p1, sizeof (*tr));
388 tr->map_domain_index = map_domain_index1;
392 p0->error = error_node->errors[error0];
393 p1->error = error_node->errors[error1];
395 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
396 n_left_to_next, pi0, pi1, next0,
400 while (n_left_from > 0 && n_left_to_next > 0)
405 u8 error0 = MAP_ERROR_NONE;
409 u32 next0 = IP4_MAP_NEXT_IP6_LOOKUP;
410 u32 map_domain_index0 = ~0;
412 pi0 = to_next[0] = from[0];
418 p0 = vlib_get_buffer (vm, pi0);
419 ip40 = vlib_buffer_get_current (p0);
420 map_domain_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
421 d0 = ip4_map_get_domain (map_domain_index0);
425 * Shared IPv4 address
427 port0 = ip4_map_port_and_security_check (d0, ip40, &next0, &error0);
429 /* Decrement IPv4 TTL */
430 ip4_map_decrement_ttl (ip40, &error0);
432 ip40->flags_and_fragment_offset &
433 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT);
436 u32 da40 = clib_net_to_host_u32 (ip40->dst_address.as_u32);
437 u16 dp40 = clib_net_to_host_u16 (port0);
438 u64 dal60 = map_get_pfx (d0, da40, dp40);
439 u64 dar60 = map_get_sfx (d0, da40, dp40);
440 if (dal60 == 0 && dar60 == 0 && error0 == MAP_ERROR_NONE
441 && next0 != IP4_MAP_NEXT_REASS)
442 error0 = MAP_ERROR_NO_BINDING;
444 /* construct ipv6 header */
445 vlib_buffer_advance (p0, -(sizeof (ip6_header_t)));
446 ip6h0 = vlib_buffer_get_current (p0);
447 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
449 ip6h0->ip_version_traffic_class_and_flow_label =
450 ip4_map_vtcfl (ip40, p0);
451 ip6h0->payload_length = ip40->length;
452 ip6h0->protocol = IP_PROTOCOL_IP_IN_IP;
453 ip6h0->hop_limit = 0x40;
454 ip6h0->src_address = d0->ip6_src;
455 ip6h0->dst_address.as_u64[0] = clib_host_to_net_u64 (dal60);
456 ip6h0->dst_address.as_u64[1] = clib_host_to_net_u64 (dar60);
459 * Determine next node. Can be one of:
460 * ip6-lookup, ip6-rewrite, ip4-fragment, ip4-virtreass, error-drop
462 if (PREDICT_TRUE (error0 == MAP_ERROR_NONE))
466 && (clib_net_to_host_u16 (ip6h0->payload_length) +
467 sizeof (*ip6h0) > d0->mtu)))
469 next0 = ip4_map_fragment (p0, d0->mtu, df0, &error0);
474 ip4_map_ip6_lookup_bypass (p0,
476 IP4_MAP_NEXT_IP6_REWRITE : next0;
477 vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
479 map_domain_index0, 1,
481 (ip6h0->payload_length) +
487 next0 = IP4_MAP_NEXT_DROP;
490 if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
492 map_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
493 tr->map_domain_index = map_domain_index0;
497 p0->error = error_node->errors[error0];
498 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
499 n_left_to_next, pi0, next0);
501 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
504 return frame->n_vectors;
511 ip4_map_reass (vlib_main_t * vm,
512 vlib_node_runtime_t * node, vlib_frame_t * frame)
514 u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
515 vlib_node_runtime_t *error_node =
516 vlib_node_get_runtime (vm, ip4_map_reass_node.index);
517 from = vlib_frame_vector_args (frame);
518 n_left_from = frame->n_vectors;
519 next_index = node->cached_next_index;
520 map_main_t *mm = &map_main;
521 vlib_combined_counter_main_t *cm = mm->domain_counters;
522 u32 thread_index = vlib_get_thread_index ();
523 u32 *fragments_to_drop = NULL;
524 u32 *fragments_to_loopback = NULL;
526 while (n_left_from > 0)
528 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
530 while (n_left_from > 0 && n_left_to_next > 0)
535 u8 error0 = MAP_ERROR_NONE;
539 u32 next0 = IP4_MAP_REASS_NEXT_IP6_LOOKUP;
540 u32 map_domain_index0;
543 pi0 = to_next[0] = from[0];
549 p0 = vlib_get_buffer (vm, pi0);
550 ip60 = vlib_buffer_get_current (p0);
551 ip40 = (ip4_header_t *) (ip60 + 1);
552 map_domain_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
553 d0 = ip4_map_get_domain (map_domain_index0);
555 map_ip4_reass_lock ();
556 map_ip4_reass_t *r = map_ip4_reass_get (ip40->src_address.as_u32,
557 ip40->dst_address.as_u32,
561 if (PREDICT_FALSE (!r))
563 // Could not create a caching entry
564 error0 = MAP_ERROR_FRAGMENT_MEMORY;
566 else if (PREDICT_TRUE (ip4_get_fragment_offset (ip40)))
570 // We know the port already
573 else if (map_ip4_reass_add_fragment (r, pi0))
575 // Not enough space for caching
576 error0 = MAP_ERROR_FRAGMENT_MEMORY;
577 map_ip4_reass_free (r, &fragments_to_drop);
584 else if ((port0 = ip4_get_port (ip40, 0)) == 0)
586 // Could not find port. We'll free the reassembly.
587 error0 = MAP_ERROR_BAD_PROTOCOL;
589 map_ip4_reass_free (r, &fragments_to_drop);
594 map_ip4_reass_get_fragments (r, &fragments_to_loopback);
597 #ifdef MAP_IP4_REASS_COUNT_BYTES
600 r->forwarded += clib_host_to_net_u16 (ip40->length) - 20;
601 if (!ip4_get_fragment_more (ip40))
603 ip4_get_fragment_offset (ip40) * 8 +
604 clib_host_to_net_u16 (ip40->length) - 20;
605 if (r->forwarded >= r->expected_total)
606 map_ip4_reass_free (r, &fragments_to_drop);
610 map_ip4_reass_unlock ();
612 // NOTE: Most operations have already been performed by ip4_map
613 // All we need is the right destination address
614 ip60->dst_address.as_u64[0] =
615 map_get_pfx_net (d0, ip40->dst_address.as_u32, port0);
616 ip60->dst_address.as_u64[1] =
617 map_get_sfx_net (d0, ip40->dst_address.as_u32, port0);
621 && (clib_net_to_host_u16 (ip60->payload_length) +
622 sizeof (*ip60) > d0->mtu)))
624 vnet_buffer (p0)->ip_frag.header_offset = sizeof (*ip60);
625 vnet_buffer (p0)->ip_frag.next_index = IP4_FRAG_NEXT_IP6_LOOKUP;
626 vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
627 vnet_buffer (p0)->ip_frag.flags = IP_FRAG_FLAG_IP6_HEADER;
628 next0 = IP4_MAP_REASS_NEXT_IP4_FRAGMENT;
631 if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
633 map_ip4_map_reass_trace_t *tr =
634 vlib_add_trace (vm, node, p0, sizeof (*tr));
635 tr->map_domain_index = map_domain_index0;
648 if (error0 == MAP_ERROR_NONE)
649 vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
651 map_domain_index0, 1,
653 (ip60->payload_length) + 40);
655 (error0 == MAP_ERROR_NONE) ? next0 : IP4_MAP_REASS_NEXT_DROP;
656 p0->error = error_node->errors[error0];
657 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
658 n_left_to_next, pi0, next0);
661 //Loopback when we reach the end of the inpu vector
662 if (n_left_from == 0 && vec_len (fragments_to_loopback))
664 from = vlib_frame_vector_args (frame);
665 u32 len = vec_len (fragments_to_loopback);
666 if (len <= VLIB_FRAME_SIZE)
668 clib_memcpy (from, fragments_to_loopback,
671 vec_reset_length (fragments_to_loopback);
676 fragments_to_loopback + (len -
678 sizeof (u32) * VLIB_FRAME_SIZE);
679 n_left_from = VLIB_FRAME_SIZE;
680 _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
684 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
687 map_send_all_to_node (vm, fragments_to_drop, node,
688 &error_node->errors[MAP_ERROR_FRAGMENT_DROPPED],
689 IP4_MAP_REASS_NEXT_DROP);
691 vec_free (fragments_to_drop);
692 vec_free (fragments_to_loopback);
693 return frame->n_vectors;
696 static char *map_error_strings[] = {
697 #define _(sym,string) string,
703 VLIB_REGISTER_NODE(ip4_map_node) = {
706 .vector_size = sizeof(u32),
707 .format_trace = format_map_trace,
708 .type = VLIB_NODE_TYPE_INTERNAL,
710 .n_errors = MAP_N_ERROR,
711 .error_strings = map_error_strings,
713 .n_next_nodes = IP4_MAP_N_NEXT,
715 [IP4_MAP_NEXT_IP6_LOOKUP] = "ip6-lookup",
716 #ifdef MAP_SKIP_IP6_LOOKUP
717 [IP4_MAP_NEXT_IP6_REWRITE] = "ip6-load-balance",
719 [IP4_MAP_NEXT_IP4_FRAGMENT] = "ip4-frag",
720 [IP4_MAP_NEXT_IP6_FRAGMENT] = "ip6-frag",
721 [IP4_MAP_NEXT_REASS] = "ip4-map-reass",
722 [IP4_MAP_NEXT_ICMP_ERROR] = "ip4-icmp-error",
723 [IP4_MAP_NEXT_DROP] = "error-drop",
729 VLIB_REGISTER_NODE(ip4_map_reass_node) = {
730 .function = ip4_map_reass,
731 .name = "ip4-map-reass",
732 .vector_size = sizeof(u32),
733 .format_trace = format_ip4_map_reass_trace,
734 .type = VLIB_NODE_TYPE_INTERNAL,
736 .n_errors = MAP_N_ERROR,
737 .error_strings = map_error_strings,
739 .n_next_nodes = IP4_MAP_REASS_N_NEXT,
741 [IP4_MAP_REASS_NEXT_IP6_LOOKUP] = "ip6-lookup",
742 [IP4_MAP_REASS_NEXT_IP4_FRAGMENT] = "ip4-frag",
743 [IP4_MAP_REASS_NEXT_DROP] = "error-drop",
749 * fd.io coding-style-patch-verification: ON
752 * eval: (c-set-style "gnu")