Mercurial > hg > nginx
annotate src/core/ngx_crc32.h @ 7142:b9d919b53593 stable-1.12
Stream: relaxed next upstream condition (ticket #1317).
When switching to a next upstream, some buffers could be stuck in the middle
of the filter chain. A condition existed that raised an error when this
happened. As it turned out, this condition prevented switching to a next
upstream if ssl preread was used with the TCP protocol (see the ticket).
In fact, the condition does not make sense for TCP, since after successful
connection to an upstream switching to another upstream never happens. As for
UDP, the issue with stuck buffers is unlikely to happen, but is still possible.
Specifically, if a filter delays sending data to upstream.
The condition can be relaxed to only check the "buffered" bitmask of the
upstream connection. The new condition is simpler and fixes the ticket issue
as well. Additionally, the upstream_out chain is now reset for UDP prior to
connecting to a new upstream to prevent repeating the client data twice.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Mon, 11 Sep 2017 15:32:31 +0300 |
parents | d620f497c50f |
children |
rev | line source |
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790 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
790 | 5 */ |
6 | |
7 | |
8 #ifndef _NGX_CRC32_H_INCLUDED_ | |
9 #define _NGX_CRC32_H_INCLUDED_ | |
10 | |
11 | |
12 #include <ngx_config.h> | |
13 #include <ngx_core.h> | |
14 | |
15 | |
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16 extern uint32_t *ngx_crc32_table_short; |
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17 extern uint32_t ngx_crc32_table256[]; |
790 | 18 |
19 | |
20 static ngx_inline uint32_t | |
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21 ngx_crc32_short(u_char *p, size_t len) |
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22 { |
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23 u_char c; |
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24 uint32_t crc; |
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25 |
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26 crc = 0xffffffff; |
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27 |
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28 while (len--) { |
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29 c = *p++; |
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30 crc = ngx_crc32_table_short[(crc ^ (c & 0xf)) & 0xf] ^ (crc >> 4); |
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31 crc = ngx_crc32_table_short[(crc ^ (c >> 4)) & 0xf] ^ (crc >> 4); |
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32 } |
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33 |
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34 return crc ^ 0xffffffff; |
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35 } |
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36 |
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37 |
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38 static ngx_inline uint32_t |
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39 ngx_crc32_long(u_char *p, size_t len) |
790 | 40 { |
41 uint32_t crc; | |
42 | |
43 crc = 0xffffffff; | |
44 | |
45 while (len--) { | |
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46 crc = ngx_crc32_table256[(crc ^ *p++) & 0xff] ^ (crc >> 8); |
790 | 47 } |
48 | |
49 return crc ^ 0xffffffff; | |
50 } | |
51 | |
52 | |
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53 #define ngx_crc32_init(crc) \ |
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54 crc = 0xffffffff |
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55 |
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56 |
1697 | 57 static ngx_inline void |
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58 ngx_crc32_update(uint32_t *crc, u_char *p, size_t len) |
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59 { |
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60 uint32_t c; |
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61 |
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62 c = *crc; |
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63 |
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64 while (len--) { |
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65 c = ngx_crc32_table256[(c ^ *p++) & 0xff] ^ (c >> 8); |
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66 } |
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67 |
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68 *crc = c; |
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69 } |
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70 |
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71 |
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72 #define ngx_crc32_final(crc) \ |
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73 crc ^= 0xffffffff |
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74 |
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75 |
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76 ngx_int_t ngx_crc32_table_init(void); |
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77 |
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78 |
790 | 79 #endif /* _NGX_CRC32_H_INCLUDED_ */ |