1 /*
2 * Copyright (c) 2010 Intel Corporation. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #if !defined(_RDMA_IB_H)
34 #define _RDMA_IB_H
35
36 #include <linux/types.h>
37 #include <linux/sched.h>
38 #include <linux/cred.h>
39 #include <linux/uaccess.h>
40 #include <linux/fs.h>
41
42 struct ib_addr {
43 union {
44 __u8 uib_addr8[16];
45 __be16 uib_addr16[8];
46 __be32 uib_addr32[4];
47 __be64 uib_addr64[2];
48 } ib_u;
49 #define sib_addr8 ib_u.uib_addr8
50 #define sib_addr16 ib_u.uib_addr16
51 #define sib_addr32 ib_u.uib_addr32
52 #define sib_addr64 ib_u.uib_addr64
53 #define sib_raw ib_u.uib_addr8
54 #define sib_subnet_prefix ib_u.uib_addr64[0]
55 #define sib_interface_id ib_u.uib_addr64[1]
56 };
57
58 static inline bool ib_addr_any(const struct ib_addr *a)
59 {
60 return ((a->sib_addr64[0] | a->sib_addr64[1]) == 0);
61 }
62
63 static inline bool ib_addr_loopback(const struct ib_addr *a)
64 {
65 return ((a->sib_addr32[0] | a->sib_addr32[1] |
66 a->sib_addr32[2] | (a->sib_addr32[3] ^ htonl(1))) == 0);
67 }
68
69 static inline void ib_addr_set(struct ib_addr *addr,
70 __be32 w1, __be32 w2, __be32 w3, __be32 w4)
71 {
72 addr->sib_addr32[0] = w1;
73 addr->sib_addr32[1] = w2;
74 addr->sib_addr32[2] = w3;
75 addr->sib_addr32[3] = w4;
76 }
77
78 static inline int ib_addr_cmp(const struct ib_addr *a1, const struct ib_addr *a2)
79 {
80 return memcmp(a1, a2, sizeof(struct ib_addr));
81 }
82
83 struct sockaddr_ib {
84 unsigned short int sib_family; /* AF_IB */
85 __be16 sib_pkey;
86 __be32 sib_flowinfo;
87 struct ib_addr sib_addr;
88 __be64 sib_sid;
89 __be64 sib_sid_mask;
90 __u64 sib_scope_id;
91 };
92
93 /*
94 * The IB interfaces that use write() as bi-directional ioctl() are
95 * fundamentally unsafe, since there are lots of ways to trigger "write()"
96 * calls from various contexts with elevated privileges. That includes the
97 * traditional suid executable error message writes, but also various kernel
98 * interfaces that can write to file descriptors.
99 *
100 * This function provides protection for the legacy API by restricting the
101 * calling context.
102 */
103 static inline bool ib_safe_file_access(struct file *filp)
104 {
105 return filp->f_cred == current_cred() && !uaccess_kernel();
106 }
107
108 #endif /* _RDMA_IB_H */