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
  40 struct 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
  56 static inline int ib_addr_any(const struct ib_addr *a)
  57 {
  58         return ((a->sib_addr64[0] | a->sib_addr64[1]) == 0);
  59 }
  60
  61 static 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
  67 static 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
  76 static 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
  81 struct 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  */
 101 static 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 */