| … | |
… | |
| 84 | { |
84 | { |
| 85 | memset (v, -1, sizeof v); |
85 | memset (v, -1, sizeof v); |
| 86 | seq = seqno; |
86 | seq = seqno; |
| 87 | } |
87 | } |
| 88 | |
88 | |
| 89 | bool recv_ok (u32 seqno) |
89 | // 0 == ok, 1 == silently ignore, 2 == error, reset |
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|
90 | int seqno_classify (u32 seqno) |
| 90 | { |
91 | { |
| 91 | if (seqno <= seq - WINDOWSIZE) |
92 | if (seqno <= seq - WINDOWSIZE) |
| 92 | slog (L_ERR, _("received duplicate or outdated packet (received %08lx, expected %08lx)\n" |
93 | return 1; |
| 93 | "possible replay attack, or just massive packet reordering"), seqno, seq + 1); |
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|
| 94 | else if (seqno > seq + WINDOWSIZE * 4) |
94 | else if (seqno > seq + WINDOWSIZE * 16) |
| 95 | slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n" |
95 | return 2; |
| 96 | "possible replay attack, or just massive packet loss"), seqno, seq + 1); |
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|
| 97 | else |
96 | else |
| 98 | { |
97 | { |
| 99 | while (seqno > seq) |
98 | while (seqno > seq) |
| 100 | { |
99 | { |
| 101 | seq++; |
100 | seq++; |
| … | |
… | |
| 110 | u32 s = seqno % WINDOWSIZE; |
109 | u32 s = seqno % WINDOWSIZE; |
| 111 | u32 *cell = v + (s >> 5); |
110 | u32 *cell = v + (s >> 5); |
| 112 | u32 mask = 1 << (s & 31); |
111 | u32 mask = 1 << (s & 31); |
| 113 | |
112 | |
| 114 | if (*cell & mask) |
113 | if (*cell & mask) |
| 115 | slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n" |
114 | return 1; |
| 116 | "possible replay attack, or just packet duplication"), seqno, seq + 1); |
|
|
| 117 | else |
115 | else |
| 118 | { |
116 | { |
| 119 | *cell |= mask; |
117 | *cell |= mask; |
| 120 | return true; |
118 | return 0; |
| 121 | } |
119 | } |
| 122 | } |
120 | } |
| 123 | |
|
|
| 124 | return false; |
|
|
| 125 | } |
121 | } |
| 126 | }; |
122 | }; |
| 127 | |
123 | |
| 128 | typedef callback<const char * ()> run_script_cb; |
124 | typedef callback<const char * ()> run_script_cb; |
| 129 | |
125 | |
