ib.h revision 331769 
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/file.h>
39
40/*
41 * Define a native infiniband address as in Linux upstream
42 * 8d36eb01da5d371feffa280e501377b5c450f5a5
43 */
44#define	AF_IB	41
45
46struct ib_addr {
47	union {
48		__u8		uib_addr8[16];
49		__be16		uib_addr16[8];
50		__be32		uib_addr32[4];
51		__be64		uib_addr64[2];
52	} ib_u;
53#define sib_addr8		ib_u.uib_addr8
54#define sib_addr16		ib_u.uib_addr16
55#define sib_addr32		ib_u.uib_addr32
56#define sib_addr64		ib_u.uib_addr64
57#define sib_raw			ib_u.uib_addr8
58#define sib_subnet_prefix	ib_u.uib_addr64[0]
59#define sib_interface_id	ib_u.uib_addr64[1]
60};
61
62static inline int ib_addr_any(const struct ib_addr *a)
63{
64	return ((a->sib_addr64[0] | a->sib_addr64[1]) == 0);
65}
66
67static inline int ib_addr_loopback(const struct ib_addr *a)
68{
69	return ((a->sib_addr32[0] | a->sib_addr32[1] |
70		 a->sib_addr32[2] | (a->sib_addr32[3] ^ htonl(1))) == 0);
71}
72
73static inline void ib_addr_set(struct ib_addr *addr,
74			       __be32 w1, __be32 w2, __be32 w3, __be32 w4)
75{
76	addr->sib_addr32[0] = w1;
77	addr->sib_addr32[1] = w2;
78	addr->sib_addr32[2] = w3;
79	addr->sib_addr32[3] = w4;
80}
81
82static inline int ib_addr_cmp(const struct ib_addr *a1, const struct ib_addr *a2)
83{
84	return memcmp(a1, a2, sizeof(struct ib_addr));
85}
86
87struct sockaddr_ib {
88	unsigned short int	sib_family;	/* AF_IB */
89	__be16			sib_pkey;
90	__be32			sib_flowinfo;
91	struct ib_addr		sib_addr;
92	__be64			sib_sid;
93	__be64			sib_sid_mask;
94	__u64			sib_scope_id;
95};
96
97/*
98 * The IB interfaces that use write() as bi-directional ioctl() are
99 * fundamentally unsafe, since there are lots of ways to trigger "write()"
100 * calls from various contexts with elevated privileges. That includes the
101 * traditional suid executable error message writes, but also various kernel
102 * interfaces that can write to file descriptors.
103 *
104 * This function provides protection for the legacy API by restricting the
105 * calling context.
106 */
107static inline bool ib_safe_file_access(struct file *filp)
108{
109	struct thread *td = curthread;
110
111	/*
112	 * Check if called from userspace through a devfs related
113	 * system call belonging to the given file:
114	 */
115	return (filp->_file != NULL &&
116		filp->_file == td->td_fpop &&
117		filp->_file->f_cred == td->td_ucred);
118}
119
120#endif /* _RDMA_IB_H */
121