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c215a4bc IJ |
1 | /* |
2 | * This file is part of secnet. | |
3 | * See README for full list of copyright holders. | |
4 | * | |
5 | * secnet is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version d of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * secnet is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * version 3 along with secnet; if not, see | |
17 | * https://www.gnu.org/licenses/gpl.html. | |
18 | */ | |
92a7d254 IJ |
19 | |
20 | #ifndef TRANSFORM_COMMON_H | |
21 | #define TRANSFORM_COMMON_H | |
22 | ||
5b5f297f IJ |
23 | #include "magic.h" |
24 | ||
92a7d254 IJ |
25 | #define KEYED_CHECK do{ \ |
26 | if (!ti->keyed) { \ | |
27 | *errmsg="transform unkeyed"; \ | |
28 | return 1; \ | |
29 | } \ | |
30 | }while(0) | |
31 | ||
83692003 IJ |
32 | #define RECVBITMAP_SIZE 32 |
33 | typedef uint32_t recvbitmap_type; | |
34 | ||
35 | #define SEQNUM_CHECK(seqnum, p) do{ \ | |
36 | uint32_t skew=seqnum-ti->lastrecvseq; \ | |
37 | if (skew<0x8fffffff) { \ | |
38 | /* Ok */ \ | |
39 | ti->lastrecvseq=seqnum; \ | |
40 | if (skew < RECVBITMAP_SIZE) \ | |
41 | ti->recvbitmap <<= skew; \ | |
42 | else \ | |
43 | ti->recvbitmap=0; \ | |
44 | skew=0; \ | |
45 | } else if ((0-skew)<(p)->max_seq_skew) { \ | |
46 | /* Ok */ \ | |
47 | } else { \ | |
48 | /* Too much skew */ \ | |
49 | *errmsg="seqnum: too much skew"; \ | |
50 | return 2; \ | |
51 | } \ | |
52 | if ((p)->dedupe) { \ | |
53 | recvbitmap_type recvbit=(uint32_t)1 << skew; \ | |
54 | if (ti->recvbitmap & recvbit) { \ | |
55 | *errmsg="seqnum: duplicate"; \ | |
56 | return 2; \ | |
57 | } \ | |
58 | ti->recvbitmap |= recvbit; \ | |
59 | } \ | |
92a7d254 IJ |
60 | }while(0) |
61 | ||
35d30aa3 IJ |
62 | #define SEQNUM_KEYED_FIELDS \ |
63 | uint32_t sendseq; \ | |
64 | uint32_t lastrecvseq; \ | |
83692003 | 65 | recvbitmap_type recvbitmap; /* 1<<0 is lastrecvseq (i.e., most recent) */ \ |
35d30aa3 IJ |
66 | bool_t keyed |
67 | ||
68 | #define SEQNUM_KEYED_INIT(initlastrecvseq,initsendseq) \ | |
69 | (ti->lastrecvseq=(initlastrecvseq), \ | |
70 | ti->sendseq=(initsendseq), \ | |
83692003 | 71 | ti->recvbitmap=0, \ |
35d30aa3 IJ |
72 | ti->keyed=True) |
73 | ||
92a7d254 IJ |
74 | #define TRANSFORM_VALID \ |
75 | static bool_t transform_valid(void *sst) \ | |
76 | { \ | |
77 | struct transform_inst *ti=sst; \ | |
78 | \ | |
79 | return ti->keyed; \ | |
80 | } | |
81 | ||
82 | #define TRANSFORM_DESTROY \ | |
83 | static void transform_destroy(void *sst) \ | |
84 | { \ | |
85 | struct transform_inst *st=sst; \ | |
86 | \ | |
87 | FILLZERO(*st); /* Destroy key material */ \ | |
88 | free(st); \ | |
89 | } | |
90 | ||
5b5f297f IJ |
91 | #define SET_CAPAB_TRANSFORMNUM(def) do{ \ |
92 | st->ops.capab_transformnum=dict_read_number(dict, "capab-num", \ | |
35d30aa3 | 93 | False, "transform", loc, (def)); \ |
5b5f297f IJ |
94 | if (st->ops.capab_transformnum > CAPAB_TRANSFORMNUM_MAX) \ |
95 | cfgfatal(loc,"transform","capab-num out of range 0..%d\n", \ | |
96 | CAPAB_TRANSFORMNUM_MAX); \ | |
97 | }while(0) | |
98 | ||
92a7d254 IJ |
99 | #define TRANSFORM_CREATE_CORE \ |
100 | struct transform_inst *ti; \ | |
952f601f | 101 | NEW(ti); \ |
92a7d254 IJ |
102 | /* mlock XXX */ \ |
103 | ti->ops.st=ti; \ | |
104 | ti->ops.setkey=transform_setkey; \ | |
105 | ti->ops.valid=transform_valid; \ | |
106 | ti->ops.delkey=transform_delkey; \ | |
107 | ti->ops.forwards=transform_forward; \ | |
108 | ti->ops.reverse=transform_reverse; \ | |
109 | ti->ops.destroy=transform_destroy; \ | |
110 | ti->keyed=False; | |
111 | ||
35d30aa3 | 112 | #define SEQNUM_PARAMS_FIELDS \ |
83692003 IJ |
113 | uint32_t max_seq_skew; \ |
114 | bool_t dedupe; | |
35d30aa3 IJ |
115 | |
116 | #define SEQNUM_PARAMS_INIT(dict,p,desc,loc) \ | |
117 | (p)->max_seq_skew=dict_read_number((dict), "max-sequence-skew", \ | |
83692003 IJ |
118 | False, (desc), (loc), 10); \ |
119 | bool_t can_dedupe=(p)->max_seq_skew < RECVBITMAP_SIZE; \ | |
120 | (p)->dedupe=dict_read_bool((dict), "dedupe", \ | |
121 | False,(desc),(loc), can_dedupe); \ | |
122 | if ((p)->dedupe && !can_dedupe) \ | |
123 | cfgfatal(loc,"transform", \ | |
124 | "cannot dedupe with max-sequence-skew>=32"); \ | |
125 | else (void)0 | |
35d30aa3 | 126 | |
92a7d254 | 127 | #endif /*TRANSFORM_COMMON_H*/ |