BadVPN – Blame information for rev 1
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1 | office | 1 | /** |
2 | * @file PacketRouter.c |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |||
30 | #include <flow/PacketRouter.h> |
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31 | |||
32 | static void input_handler_done (PacketRouter *o, int data_len) |
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33 | { |
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34 | ASSERT(data_len >= 0) |
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35 | ASSERT(data_len <= o->mtu - o->recv_offset) |
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36 | ASSERT(!BPending_IsSet(&o->next_job)) |
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37 | DebugObject_Access(&o->d_obj); |
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38 | |||
39 | // set next job |
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40 | BPending_Set(&o->next_job); |
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41 | |||
42 | // call handler |
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43 | o->handler(o->user, RouteBufferSource_Pointer(&o->rbs), data_len); |
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44 | return; |
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45 | } |
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46 | |||
47 | static void next_job_handler (PacketRouter *o) |
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48 | { |
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49 | DebugObject_Access(&o->d_obj); |
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50 | |||
51 | // receive |
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52 | PacketRecvInterface_Receiver_Recv(o->input, RouteBufferSource_Pointer(&o->rbs) + o->recv_offset); |
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53 | } |
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54 | |||
55 | int PacketRouter_Init (PacketRouter *o, int mtu, int recv_offset, PacketRecvInterface *input, PacketRouter_handler handler, void *user, BPendingGroup *pg) |
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56 | { |
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57 | ASSERT(mtu >= 0) |
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58 | ASSERT(recv_offset >= 0) |
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59 | ASSERT(recv_offset <= mtu) |
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60 | ASSERT(PacketRecvInterface_GetMTU(input) <= mtu - recv_offset) |
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61 | |||
62 | // init arguments |
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63 | o->mtu = mtu; |
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64 | o->recv_offset = recv_offset; |
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65 | o->input = input; |
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66 | o->handler = handler; |
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67 | o->user = user; |
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68 | |||
69 | // init input |
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70 | PacketRecvInterface_Receiver_Init(o->input, (PacketRecvInterface_handler_done)input_handler_done, o); |
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71 | |||
72 | // init RouteBufferSource |
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73 | if (!RouteBufferSource_Init(&o->rbs, mtu)) { |
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74 | goto fail0; |
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75 | } |
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76 | |||
77 | // init next job |
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78 | BPending_Init(&o->next_job, pg, (BPending_handler)next_job_handler, o); |
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79 | |||
80 | // receive |
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81 | PacketRecvInterface_Receiver_Recv(o->input, RouteBufferSource_Pointer(&o->rbs) + o->recv_offset); |
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82 | |||
83 | DebugObject_Init(&o->d_obj); |
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84 | |||
85 | return 1; |
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86 | |||
87 | fail0: |
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88 | return 0; |
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89 | } |
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90 | |||
91 | void PacketRouter_Free (PacketRouter *o) |
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92 | { |
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93 | DebugObject_Free(&o->d_obj); |
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94 | |||
95 | // free next job |
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96 | BPending_Free(&o->next_job); |
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97 | |||
98 | // free RouteBufferSource |
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99 | RouteBufferSource_Free(&o->rbs); |
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100 | } |
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101 | |||
102 | int PacketRouter_Route (PacketRouter *o, int len, RouteBuffer *output, uint8_t **next_buf, int copy_offset, int copy_len) |
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103 | { |
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104 | ASSERT(len >= 0) |
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105 | ASSERT(len <= o->mtu) |
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106 | ASSERT(RouteBuffer_GetMTU(output) == o->mtu) |
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107 | ASSERT(copy_offset >= 0) |
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108 | ASSERT(copy_offset <= o->mtu) |
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109 | ASSERT(copy_len >= 0) |
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110 | ASSERT(copy_len <= o->mtu - copy_offset) |
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111 | ASSERT(BPending_IsSet(&o->next_job)) |
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112 | DebugObject_Access(&o->d_obj); |
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113 | |||
114 | if (!RouteBufferSource_Route(&o->rbs, len, output, copy_offset, copy_len)) { |
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115 | return 0; |
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116 | } |
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117 | |||
118 | if (next_buf) { |
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119 | *next_buf = RouteBufferSource_Pointer(&o->rbs); |
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120 | } |
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121 | |||
122 | return 1; |
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123 | } |
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124 | |||
125 | void PacketRouter_AssertRoute (PacketRouter *o) |
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126 | { |
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127 | ASSERT(BPending_IsSet(&o->next_job)) |
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128 | DebugObject_Access(&o->d_obj); |
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129 | } |