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1 office 1 /**
2 * @file PacketRecvBlocker.c
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29  
30 #include <misc/debug.h>
31  
32 #include <flow/PacketRecvBlocker.h>
33  
34 static void output_handler_recv (PacketRecvBlocker *o, uint8_t *data)
35 {
36 ASSERT(!o->out_have)
37 DebugObject_Access(&o->d_obj);
38  
39 // remember packet
40 o->out_have = 1;
41 o->out = data;
42 o->out_input_blocking = 0;
43 }
44  
45 static void input_handler_done (PacketRecvBlocker *o, int data_len)
46 {
47 ASSERT(o->out_have)
48 ASSERT(o->out_input_blocking)
49 DebugObject_Access(&o->d_obj);
50  
51 // schedule done
52 o->out_have = 0;
53 PacketRecvInterface_Done(&o->output, data_len);
54 }
55  
56 void PacketRecvBlocker_Init (PacketRecvBlocker *o, PacketRecvInterface *input, BPendingGroup *pg)
57 {
58 // init arguments
59 o->input = input;
60  
61 // init output
62 PacketRecvInterface_Init(&o->output, PacketRecvInterface_GetMTU(o->input), (PacketRecvInterface_handler_recv)output_handler_recv, o, pg);
63  
64 // have no output packet
65 o->out_have = 0;
66  
67 // init input
68 PacketRecvInterface_Receiver_Init(o->input, (PacketRecvInterface_handler_done)input_handler_done, o);
69  
70 DebugObject_Init(&o->d_obj);
71 }
72  
73 void PacketRecvBlocker_Free (PacketRecvBlocker *o)
74 {
75 DebugObject_Free(&o->d_obj);
76  
77 // free output
78 PacketRecvInterface_Free(&o->output);
79 }
80  
81 PacketRecvInterface * PacketRecvBlocker_GetOutput (PacketRecvBlocker *o)
82 {
83 DebugObject_Access(&o->d_obj);
84  
85 return &o->output;
86 }
87  
88 void PacketRecvBlocker_AllowBlockedPacket (PacketRecvBlocker *o)
89 {
90 DebugObject_Access(&o->d_obj);
91  
92 if (!o->out_have || o->out_input_blocking) {
93 return;
94 }
95  
96 // schedule receive
97 o->out_input_blocking = 1;
98 PacketRecvInterface_Receiver_Recv(o->input, o->out);
99 }