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
 42struct 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
 58static inline bool ib_addr_any(const struct ib_addr *a)
 59{
 60	return ((a->sib_addr64[0] | a->sib_addr64[1]) == 0);
 61}
 62
 63static 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
 69static 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
 78static 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
 83struct 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 */
103static 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 */