include/rdma/ib.h

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