1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
2 /*
3 * Copyright (c) 2010 Intel Corporation. All rights reserved.
4 */
5
6 #ifndef _RDMA_IB_H
7 #define _RDMA_IB_H
8
9 #include <linux/types.h>
10 #include <linux/sched.h>
11 #include <linux/cred.h>
12 #include <linux/uaccess.h>
13 #include <linux/fs.h>
14
15 struct ib_addr {
16 union {
17 __u8 uib_addr8[16];
18 __be16 uib_addr16[8];
19 __be32 uib_addr32[4];
20 __be64 uib_addr64[2];
21 } ib_u;
22 #define sib_addr8 ib_u.uib_addr8
23 #define sib_addr16 ib_u.uib_addr16
24 #define sib_addr32 ib_u.uib_addr32
25 #define sib_addr64 ib_u.uib_addr64
26 #define sib_raw ib_u.uib_addr8
27 #define sib_subnet_prefix ib_u.uib_addr64[0]
28 #define sib_interface_id ib_u.uib_addr64[1]
29 };
30
31 static inline bool ib_addr_any(const struct ib_addr *a)
32 {
33 return ((a->sib_addr64[0] | a->sib_addr64[1]) == 0);
34 }
35
36 static inline bool ib_addr_loopback(const struct ib_addr *a)
37 {
38 return ((a->sib_addr32[0] | a->sib_addr32[1] |
39 a->sib_addr32[2] | (a->sib_addr32[3] ^ htonl(1))) == 0);
40 }
41
42 static inline void ib_addr_set(struct ib_addr *addr,
43 __be32 w1, __be32 w2, __be32 w3, __be32 w4)
44 {
45 addr->sib_addr32[0] = w1;
46 addr->sib_addr32[1] = w2;
47 addr->sib_addr32[2] = w3;
48 addr->sib_addr32[3] = w4;
49 }
50
51 static inline int ib_addr_cmp(const struct ib_addr *a1, const struct ib_addr *a2)
52 {
53 return memcmp(a1, a2, sizeof(struct ib_addr));
54 }
55
56 struct sockaddr_ib {
57 unsigned short int sib_family; /* AF_IB */
58 __be16 sib_pkey;
59 __be32 sib_flowinfo;
60 struct ib_addr sib_addr;
61 __be64 sib_sid;
62 __be64 sib_sid_mask;
63 __u64 sib_scope_id;
64 };
65
66 /*
67 * The IB interfaces that use write() as bi-directional ioctl() are
68 * fundamentally unsafe, since there are lots of ways to trigger "write()"
69 * calls from various contexts with elevated privileges. That includes the
70 * traditional suid executable error message writes, but also various kernel
71 * interfaces that can write to file descriptors.
72 *
73 * This function provides protection for the legacy API by restricting the
74 * calling context.
75 */
76 static inline bool ib_safe_file_access(struct file *filp)
77 {
78 return filp->f_cred == current_cred();
79 }
80
81 #endif /* _RDMA_IB_H */
82
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