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1 | /* |
2 | * QEMU Crypto af_alg support | |
3 | * | |
4 | * Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD. | |
5 | * | |
6 | * Authors: | |
7 | * Longpeng(Mike) <[email protected]> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2 or | |
10 | * (at your option) any later version. See the COPYING file in the | |
11 | * top-level directory. | |
12 | */ | |
13 | #include "qemu/osdep.h" | |
14 | #include "qemu/cutils.h" | |
15 | #include "qemu/sockets.h" | |
16 | #include "qapi/error.h" | |
17 | #include "afalgpriv.h" | |
18 | ||
19 | static bool | |
20 | qcrypto_afalg_build_saddr(const char *type, const char *name, | |
21 | struct sockaddr_alg *salg, Error **errp) | |
22 | { | |
23 | salg->salg_family = AF_ALG; | |
24 | ||
25 | if (strnlen(type, SALG_TYPE_LEN_MAX) >= SALG_TYPE_LEN_MAX) { | |
26 | error_setg(errp, "Afalg type(%s) is larger than %d bytes", | |
27 | type, SALG_TYPE_LEN_MAX); | |
28 | return false; | |
29 | } | |
30 | ||
31 | if (strnlen(name, SALG_NAME_LEN_MAX) >= SALG_NAME_LEN_MAX) { | |
32 | error_setg(errp, "Afalg name(%s) is larger than %d bytes", | |
33 | name, SALG_NAME_LEN_MAX); | |
34 | return false; | |
35 | } | |
36 | ||
37 | pstrcpy((char *)salg->salg_type, SALG_TYPE_LEN_MAX, type); | |
38 | pstrcpy((char *)salg->salg_name, SALG_NAME_LEN_MAX, name); | |
39 | ||
40 | return true; | |
41 | } | |
42 | ||
43 | static int | |
44 | qcrypto_afalg_socket_bind(const char *type, const char *name, | |
45 | Error **errp) | |
46 | { | |
47 | int sbind; | |
48 | struct sockaddr_alg salg = {0}; | |
49 | ||
50 | if (!qcrypto_afalg_build_saddr(type, name, &salg, errp)) { | |
51 | return -1; | |
52 | } | |
53 | ||
54 | sbind = qemu_socket(AF_ALG, SOCK_SEQPACKET, 0); | |
55 | if (sbind < 0) { | |
56 | error_setg_errno(errp, errno, "Failed to create socket"); | |
57 | return -1; | |
58 | } | |
59 | ||
60 | if (bind(sbind, (const struct sockaddr *)&salg, sizeof(salg)) != 0) { | |
61 | error_setg_errno(errp, errno, "Failed to bind socket"); | |
62 | closesocket(sbind); | |
63 | return -1; | |
64 | } | |
65 | ||
66 | return sbind; | |
67 | } | |
68 | ||
69 | QCryptoAFAlg * | |
70 | qcrypto_afalg_comm_alloc(const char *type, const char *name, | |
71 | Error **errp) | |
72 | { | |
73 | QCryptoAFAlg *afalg; | |
74 | ||
75 | afalg = g_new0(QCryptoAFAlg, 1); | |
76 | /* initilize crypto API socket */ | |
77 | afalg->opfd = -1; | |
78 | afalg->tfmfd = qcrypto_afalg_socket_bind(type, name, errp); | |
79 | if (afalg->tfmfd == -1) { | |
80 | goto error; | |
81 | } | |
82 | ||
83 | afalg->opfd = qemu_accept(afalg->tfmfd, NULL, 0); | |
84 | if (afalg->opfd == -1) { | |
85 | error_setg_errno(errp, errno, "Failed to accept socket"); | |
86 | goto error; | |
87 | } | |
88 | ||
89 | return afalg; | |
90 | ||
91 | error: | |
92 | qcrypto_afalg_comm_free(afalg); | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | void qcrypto_afalg_comm_free(QCryptoAFAlg *afalg) | |
97 | { | |
98 | if (!afalg) { | |
99 | return; | |
100 | } | |
101 | ||
102 | if (afalg->msg) { | |
103 | g_free(afalg->msg->msg_control); | |
104 | g_free(afalg->msg); | |
105 | } | |
106 | ||
107 | if (afalg->tfmfd != -1) { | |
108 | closesocket(afalg->tfmfd); | |
109 | } | |
110 | ||
111 | if (afalg->opfd != -1) { | |
112 | closesocket(afalg->opfd); | |
113 | } | |
114 | ||
115 | g_free(afalg); | |
116 | } |