src/vnet/lawful-intercept/node.c - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2015 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <vlib/vlib.h>
 #include <vnet/vnet.h>
 #include <vppinfra/error.h>

 #include <vnet/lawful-intercept/lawful_intercept.h>

 #include <vppinfra/error.h>
 #include <vppinfra/elog.h>

 vlib_node_registration_t li_hit_node;

 typedef struct {
   u32 next_index;
 } li_hit_trace_t;

 /* packet trace format function */
 static u8 * format_li_hit_trace (u8 * s, va_list * args)
 {
   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
   li_hit_trace_t * t = va_arg (*args, li_hit_trace_t *);

   s = format (s, "LI_HIT: next index %d", t->next_index);

   return s;
 }

 vlib_node_registration_t li_hit_node;

 #define foreach_li_hit_error                                    \
 _(HITS, "LI packets processed")                                 \
 _(NO_COLLECTOR, "No collector configured")                      \
 _(BUFFER_ALLOCATION_FAILURE, "Buffer allocation failure")

 typedef enum {
 #define _(sym,str) LI_HIT_ERROR_##sym,
   foreach_li_hit_error
 #undef _
   LI_HIT_N_ERROR,
 } li_hit_error_t;

 static char * li_hit_error_strings[] = {
 #define _(sym,string) string,
   foreach_li_hit_error
 #undef _
 };

 typedef enum {
   LI_HIT_NEXT_ETHERNET,
   LI_HIT_N_NEXT,
 } li_hit_next_t;

 static uword
 li_hit_node_fn (vlib_main_t * vm,
 		  vlib_node_runtime_t * node,
 		  vlib_frame_t * frame)
 {
   u32 n_left_from, * from, * to_next;
   li_hit_next_t next_index;
   vlib_frame_t * int_frame = 0;
   u32 * to_int_next = 0;
   li_main_t * lm = &li_main;

   from = vlib_frame_vector_args (frame);
   n_left_from = frame->n_vectors;
   next_index = node->cached_next_index;

   if (PREDICT_FALSE (vec_len (lm->collectors) == 0))
     {
       vlib_node_increment_counter (vm, li_hit_node.index,
                                    LI_HIT_ERROR_NO_COLLECTOR,
                                    n_left_from);
     }
   else
     {
       /* The intercept frame... */
       int_frame = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
       to_int_next = vlib_frame_vector_args (int_frame);
     }

   while (n_left_from > 0)
     {
       u32 n_left_to_next;

       vlib_get_next_frame (vm, node, next_index,
 			   to_next, n_left_to_next);

 #if 0
       while (n_left_from >= 4 && n_left_to_next >= 2)
 	{
           u32 next0 = LI_HIT_NEXT_INTERFACE_OUTPUT;
           u32 next1 = LI_HIT_NEXT_INTERFACE_OUTPUT;
           u32 sw_if_index0, sw_if_index1;
           u8 tmp0[6], tmp1[6];
           ethernet_header_t *en0, *en1;
           u32 bi0, bi1;
 	  vlib_buffer_t * b0, * b1;

 	  /* Prefetch next iteration. */
 	  {
 	    vlib_buffer_t * p2, * p3;

 	    p2 = vlib_get_buffer (vm, from[2]);
 	    p3 = vlib_get_buffer (vm, from[3]);

 	    vlib_prefetch_buffer_header (p2, LOAD);
 	    vlib_prefetch_buffer_header (p3, LOAD);

 	    CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
 	    CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
 	  }

           /* speculatively enqueue b0 and b1 to the current next frame */
 	  to_next[0] = bi0 = from[0];
 	  to_next[1] = bi1 = from[1];
 	  from += 2;
 	  to_next += 2;
 	  n_left_from -= 2;
 	  n_left_to_next -= 2;

 	  b0 = vlib_get_buffer (vm, bi0);
 	  b1 = vlib_get_buffer (vm, bi1);

           /* $$$$$ Dual loop: process 2 x packets here $$$$$ */
           ASSERT (b0->current_data == 0);
           ASSERT (b1->current_data == 0);

           en0 = vlib_buffer_get_current (b0);
           en1 = vlib_buffer_get_current (b1);

           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
           sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];

           /* Send pkt back out the RX interface */
           vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
           vnet_buffer(b1)->sw_if_index[VLIB_TX] = sw_if_index1;

           /* $$$$$ End of processing 2 x packets $$$$$ */

           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
             {
               if (b0->flags & VLIB_BUFFER_IS_TRACED)
                 {
                     li_hit_trace_t *t =
                       vlib_add_trace (vm, node, b0, sizeof (*t));
                     t->sw_if_index = sw_if_index0;
                     t->next_index = next0;
                   }
                 if (b1->flags & VLIB_BUFFER_IS_TRACED)
                   {
                     li_hit_trace_t *t =
                       vlib_add_trace (vm, node, b1, sizeof (*t));
                     t->sw_if_index = sw_if_index1;
                     t->next_index = next1;
                   }
               }

             /* verify speculative enqueues, maybe switch current next frame */
             vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
                                              to_next, n_left_to_next,
                                              bi0, bi1, next0, next1);
         }
 #endif /* $$$ dual-loop off */

       while (n_left_from > 0 && n_left_to_next > 0)
 	{
           u32 bi0;
 	  vlib_buffer_t * b0;
           vlib_buffer_t * c0;
           ip4_udp_header_t * iu0;
           ip4_header_t * ip0;
           udp_header_t * udp0;
           u32 next0 = LI_HIT_NEXT_ETHERNET;

           /* speculatively enqueue b0 to the current next frame */
 	  bi0 = from[0];
 	  to_next[0] = bi0;
 	  from += 1;
 	  to_next += 1;
 	  n_left_from -= 1;
 	  n_left_to_next -= 1;

 	  b0 = vlib_get_buffer (vm, bi0);
           if (PREDICT_TRUE(to_int_next != 0))
             {
               /* Make an intercept copy. This can fail. */
               c0 = vlib_buffer_copy (vm, b0);

               if (PREDICT_FALSE (c0 == 0))
                 {
                   vlib_node_increment_counter
                     (vm, node->node_index,
                      LI_HIT_ERROR_BUFFER_ALLOCATION_FAILURE, 1);
                   goto skip;
                 }

               vlib_buffer_advance(c0, -sizeof(*iu0));

               iu0 = vlib_buffer_get_current(c0);
               ip0 = &iu0->ip4;

               ip0->ip_version_and_header_length = 0x45;
               ip0->ttl = 254;
               ip0->protocol = IP_PROTOCOL_UDP;

               ip0->src_address.as_u32 = lm->src_addrs[0].as_u32;
               ip0->dst_address.as_u32 = lm->collectors[0].as_u32;
               ip0->length = vlib_buffer_length_in_chain (vm, c0);
               ip0->checksum = ip4_header_checksum (ip0);

               udp0 = &iu0->udp;
               udp0->src_port = udp0->dst_port =
                   clib_host_to_net_u16(lm->ports[0]);
               udp0->checksum = 0;
               udp0->length =
                   clib_net_to_host_u16 (vlib_buffer_length_in_chain (vm , b0));

               to_int_next [0] = vlib_get_buffer_index (vm, c0);
               to_int_next++;
             }

         skip:
           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
                             && (b0->flags & VLIB_BUFFER_IS_TRACED)))
             {
               li_hit_trace_t *t =
                  vlib_add_trace (vm, node, b0, sizeof (*t));
               t->next_index = next0;
             }

           /* verify speculative enqueue, maybe switch current next frame */
 	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 					   to_next, n_left_to_next,
 					   bi0, next0);
 	}

       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
     }

   if (int_frame)
     {
       int_frame->n_vectors = frame->n_vectors;
       vlib_put_frame_to_node (vm, ip4_lookup_node.index, int_frame);
     }

   vlib_node_increment_counter (vm, li_hit_node.index,
                                LI_HIT_ERROR_HITS, frame->n_vectors);
   return frame->n_vectors;
 }

 VLIB_REGISTER_NODE (li_hit_node) = {
   .function = li_hit_node_fn,
   .name = "li-hit",
   .vector_size = sizeof (u32),
   .format_trace = format_li_hit_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,

   .n_errors = ARRAY_LEN(li_hit_error_strings),
   .error_strings = li_hit_error_strings,

   .n_next_nodes = LI_HIT_N_NEXT,

   /* edit / add dispositions here */
   .next_nodes = {
         [LI_HIT_NEXT_ETHERNET] = "ethernet-input-not-l2",
   },
 };

 VLIB_NODE_FUNCTION_MULTIARCH (li_hit_node, li_hit_node_fn)
	/*
	* Copyright (c) 2015 Cisco and/or its affiliates.
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <vlib/vlib.h>
	#include <vnet/vnet.h>
	#include <vppinfra/error.h>

	#include <vnet/lawful-intercept/lawful_intercept.h>

	#include <vppinfra/error.h>
	#include <vppinfra/elog.h>

	vlib_node_registration_t li_hit_node;

	typedef struct {
	u32 next_index;
	} li_hit_trace_t;

	/* packet trace format function */
	static u8 * format_li_hit_trace (u8 * s, va_list * args)
	{
	CLIB_UNUSED (vlib_main_t * vm) = va_arg (args, vlib_main_t );
	CLIB_UNUSED (vlib_node_t * node) = va_arg (args, vlib_node_t );
	li_hit_trace_t * t = va_arg (args, li_hit_trace_t );

	s = format (s, "LI_HIT: next index %d", t->next_index);

	return s;
	}

	vlib_node_registration_t li_hit_node;

	#define foreach_li_hit_error \
	_(HITS, "LI packets processed") \
	_(NO_COLLECTOR, "No collector configured") \
	_(BUFFER_ALLOCATION_FAILURE, "Buffer allocation failure")

	typedef enum {
	#define _(sym,str) LI_HIT_ERROR_##sym,
	foreach_li_hit_error
	#undef _
	LI_HIT_N_ERROR,
	} li_hit_error_t;

	static char * li_hit_error_strings[] = {
	#define _(sym,string) string,
	foreach_li_hit_error
	#undef _
	};

	typedef enum {
	LI_HIT_NEXT_ETHERNET,
	LI_HIT_N_NEXT,
	} li_hit_next_t;

	static uword
	li_hit_node_fn (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	u32 n_left_from, * from, * to_next;
	li_hit_next_t next_index;
	vlib_frame_t * int_frame = 0;
	u32 * to_int_next = 0;
	li_main_t * lm = &li_main;

	from = vlib_frame_vector_args (frame);
	n_left_from = frame->n_vectors;
	next_index = node->cached_next_index;

	if (PREDICT_FALSE (vec_len (lm->collectors) == 0))
	{
	vlib_node_increment_counter (vm, li_hit_node.index,
	LI_HIT_ERROR_NO_COLLECTOR,
	n_left_from);
	}
	else
	{
	/* The intercept frame... */
	int_frame = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
	to_int_next = vlib_frame_vector_args (int_frame);
	}

	while (n_left_from > 0)
	{
	u32 n_left_to_next;

	vlib_get_next_frame (vm, node, next_index,
	to_next, n_left_to_next);

	#if 0
	while (n_left_from >= 4 && n_left_to_next >= 2)
	{
	u32 next0 = LI_HIT_NEXT_INTERFACE_OUTPUT;
	u32 next1 = LI_HIT_NEXT_INTERFACE_OUTPUT;
	u32 sw_if_index0, sw_if_index1;
	u8 tmp0[6], tmp1[6];
	ethernet_header_t en0, en1;
	u32 bi0, bi1;
	vlib_buffer_t * b0, * b1;

	/* Prefetch next iteration. */
	{
	vlib_buffer_t * p2, * p3;

	p2 = vlib_get_buffer (vm, from[2]);
	p3 = vlib_get_buffer (vm, from[3]);

	vlib_prefetch_buffer_header (p2, LOAD);
	vlib_prefetch_buffer_header (p3, LOAD);

	CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
	CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
	}

	/* speculatively enqueue b0 and b1 to the current next frame */
	to_next[0] = bi0 = from[0];
	to_next[1] = bi1 = from[1];
	from += 2;
	to_next += 2;
	n_left_from -= 2;
	n_left_to_next -= 2;

	b0 = vlib_get_buffer (vm, bi0);
	b1 = vlib_get_buffer (vm, bi1);

	/* $$$$$ Dual loop: process 2 x packets here $$$$$ */
	ASSERT (b0->current_data == 0);
	ASSERT (b1->current_data == 0);

	en0 = vlib_buffer_get_current (b0);
	en1 = vlib_buffer_get_current (b1);

	sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
	sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];

	/* Send pkt back out the RX interface */
	vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
	vnet_buffer(b1)->sw_if_index[VLIB_TX] = sw_if_index1;

	/* $$$$$ End of processing 2 x packets $$$$$ */

	if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
	{
	if (b0->flags & VLIB_BUFFER_IS_TRACED)
	{
	li_hit_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->sw_if_index = sw_if_index0;
	t->next_index = next0;
	}
	if (b1->flags & VLIB_BUFFER_IS_TRACED)
	{
	li_hit_trace_t *t =
	vlib_add_trace (vm, node, b1, sizeof (*t));
	t->sw_if_index = sw_if_index1;
	t->next_index = next1;
	}
	}

	/* verify speculative enqueues, maybe switch current next frame */
	vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
	to_next, n_left_to_next,
	bi0, bi1, next0, next1);
	}
	#endif /* $$$ dual-loop off */

	while (n_left_from > 0 && n_left_to_next > 0)
	{
	u32 bi0;
	vlib_buffer_t * b0;
	vlib_buffer_t * c0;
	ip4_udp_header_t * iu0;
	ip4_header_t * ip0;
	udp_header_t * udp0;
	u32 next0 = LI_HIT_NEXT_ETHERNET;

	/* speculatively enqueue b0 to the current next frame */
	bi0 = from[0];
	to_next[0] = bi0;
	from += 1;
	to_next += 1;
	n_left_from -= 1;
	n_left_to_next -= 1;

	b0 = vlib_get_buffer (vm, bi0);
	if (PREDICT_TRUE(to_int_next != 0))
	{
	/* Make an intercept copy. This can fail. */
	c0 = vlib_buffer_copy (vm, b0);

	if (PREDICT_FALSE (c0 == 0))
	{
	vlib_node_increment_counter
	(vm, node->node_index,
	LI_HIT_ERROR_BUFFER_ALLOCATION_FAILURE, 1);
	goto skip;
	}

	vlib_buffer_advance(c0, -sizeof(*iu0));

	iu0 = vlib_buffer_get_current(c0);
	ip0 = &iu0->ip4;

	ip0->ip_version_and_header_length = 0x45;
	ip0->ttl = 254;
	ip0->protocol = IP_PROTOCOL_UDP;

	ip0->src_address.as_u32 = lm->src_addrs[0].as_u32;
	ip0->dst_address.as_u32 = lm->collectors[0].as_u32;
	ip0->length = vlib_buffer_length_in_chain (vm, c0);
	ip0->checksum = ip4_header_checksum (ip0);

	udp0 = &iu0->udp;
	udp0->src_port = udp0->dst_port =
	clib_host_to_net_u16(lm->ports[0]);
	udp0->checksum = 0;
	udp0->length =
	clib_net_to_host_u16 (vlib_buffer_length_in_chain (vm , b0));

	to_int_next [0] = vlib_get_buffer_index (vm, c0);
	to_int_next++;
	}

	skip:
	if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
	&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
	{
	li_hit_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->next_index = next0;
	}

	/* verify speculative enqueue, maybe switch current next frame */
	vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
	to_next, n_left_to_next,
	bi0, next0);
	}

	vlib_put_next_frame (vm, node, next_index, n_left_to_next);
	}

	if (int_frame)
	{
	int_frame->n_vectors = frame->n_vectors;
	vlib_put_frame_to_node (vm, ip4_lookup_node.index, int_frame);
	}

	vlib_node_increment_counter (vm, li_hit_node.index,
	LI_HIT_ERROR_HITS, frame->n_vectors);
	return frame->n_vectors;
	}

	VLIB_REGISTER_NODE (li_hit_node) = {
	.function = li_hit_node_fn,
	.name = "li-hit",
	.vector_size = sizeof (u32),
	.format_trace = format_li_hit_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,

	.n_errors = ARRAY_LEN(li_hit_error_strings),
	.error_strings = li_hit_error_strings,

	.n_next_nodes = LI_HIT_N_NEXT,

	/* edit / add dispositions here */
	.next_nodes = {
	[LI_HIT_NEXT_ETHERNET] = "ethernet-input-not-l2",
	},
	};

	VLIB_NODE_FUNCTION_MULTIARCH (li_hit_node, li_hit_node_fn)