LXR linux/include/rdma/ib.h

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