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() && !uaccess_kernel(); 79 } 80 81 #endif /* _RDMA_IB_H */ 82