1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (c) 2010 Intel Corporation. All rights reserved.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #ifndef _RDMA_IB_H
7*4882a593Smuzhiyun #define _RDMA_IB_H
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/types.h>
10*4882a593Smuzhiyun #include <linux/sched.h>
11*4882a593Smuzhiyun #include <linux/cred.h>
12*4882a593Smuzhiyun #include <linux/uaccess.h>
13*4882a593Smuzhiyun #include <linux/fs.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun struct ib_addr {
16*4882a593Smuzhiyun union {
17*4882a593Smuzhiyun __u8 uib_addr8[16];
18*4882a593Smuzhiyun __be16 uib_addr16[8];
19*4882a593Smuzhiyun __be32 uib_addr32[4];
20*4882a593Smuzhiyun __be64 uib_addr64[2];
21*4882a593Smuzhiyun } ib_u;
22*4882a593Smuzhiyun #define sib_addr8 ib_u.uib_addr8
23*4882a593Smuzhiyun #define sib_addr16 ib_u.uib_addr16
24*4882a593Smuzhiyun #define sib_addr32 ib_u.uib_addr32
25*4882a593Smuzhiyun #define sib_addr64 ib_u.uib_addr64
26*4882a593Smuzhiyun #define sib_raw ib_u.uib_addr8
27*4882a593Smuzhiyun #define sib_subnet_prefix ib_u.uib_addr64[0]
28*4882a593Smuzhiyun #define sib_interface_id ib_u.uib_addr64[1]
29*4882a593Smuzhiyun };
30*4882a593Smuzhiyun
ib_addr_any(const struct ib_addr * a)31*4882a593Smuzhiyun static inline bool ib_addr_any(const struct ib_addr *a)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun return ((a->sib_addr64[0] | a->sib_addr64[1]) == 0);
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
ib_addr_loopback(const struct ib_addr * a)36*4882a593Smuzhiyun static inline bool ib_addr_loopback(const struct ib_addr *a)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun return ((a->sib_addr32[0] | a->sib_addr32[1] |
39*4882a593Smuzhiyun a->sib_addr32[2] | (a->sib_addr32[3] ^ htonl(1))) == 0);
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
ib_addr_set(struct ib_addr * addr,__be32 w1,__be32 w2,__be32 w3,__be32 w4)42*4882a593Smuzhiyun static inline void ib_addr_set(struct ib_addr *addr,
43*4882a593Smuzhiyun __be32 w1, __be32 w2, __be32 w3, __be32 w4)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun addr->sib_addr32[0] = w1;
46*4882a593Smuzhiyun addr->sib_addr32[1] = w2;
47*4882a593Smuzhiyun addr->sib_addr32[2] = w3;
48*4882a593Smuzhiyun addr->sib_addr32[3] = w4;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
ib_addr_cmp(const struct ib_addr * a1,const struct ib_addr * a2)51*4882a593Smuzhiyun static inline int ib_addr_cmp(const struct ib_addr *a1, const struct ib_addr *a2)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun return memcmp(a1, a2, sizeof(struct ib_addr));
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun struct sockaddr_ib {
57*4882a593Smuzhiyun unsigned short int sib_family; /* AF_IB */
58*4882a593Smuzhiyun __be16 sib_pkey;
59*4882a593Smuzhiyun __be32 sib_flowinfo;
60*4882a593Smuzhiyun struct ib_addr sib_addr;
61*4882a593Smuzhiyun __be64 sib_sid;
62*4882a593Smuzhiyun __be64 sib_sid_mask;
63*4882a593Smuzhiyun __u64 sib_scope_id;
64*4882a593Smuzhiyun };
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun /*
67*4882a593Smuzhiyun * The IB interfaces that use write() as bi-directional ioctl() are
68*4882a593Smuzhiyun * fundamentally unsafe, since there are lots of ways to trigger "write()"
69*4882a593Smuzhiyun * calls from various contexts with elevated privileges. That includes the
70*4882a593Smuzhiyun * traditional suid executable error message writes, but also various kernel
71*4882a593Smuzhiyun * interfaces that can write to file descriptors.
72*4882a593Smuzhiyun *
73*4882a593Smuzhiyun * This function provides protection for the legacy API by restricting the
74*4882a593Smuzhiyun * calling context.
75*4882a593Smuzhiyun */
ib_safe_file_access(struct file * filp)76*4882a593Smuzhiyun static inline bool ib_safe_file_access(struct file *filp)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun return filp->f_cred == current_cred() && !uaccess_kernel();
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun #endif /* _RDMA_IB_H */
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