include/rdma/ib_addr.h

   1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
   2 /*
   3  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
   4  * Copyright (c) 2005 Intel Corporation.  All rights reserved.
   5  */
   6
   7 #ifndef IB_ADDR_H
   8 #define IB_ADDR_H
   9
  10 #include <linux/ethtool.h>
  11 #include <linux/in.h>
  12 #include <linux/in6.h>
  13 #include <linux/if_arp.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/inetdevice.h>
  16 #include <linux/socket.h>
  17 #include <linux/if_vlan.h>
  18 #include <net/ipv6.h>
  19 #include <net/if_inet6.h>
  20 #include <net/ip.h>
  21 #include <rdma/ib_verbs.h>
  22 #include <rdma/ib_pack.h>
  23 #include <net/net_namespace.h>
  24
  25 /**
  26  * struct rdma_dev_addr - Contains resolved RDMA hardware addresses
  27  * @src_dev_addr:       Source MAC address.
  28  * @dst_dev_addr:       Destination MAC address.
  29  * @broadcast:          Broadcast address of the device.
  30  * @dev_type:           The interface hardware type of the device.
  31  * @bound_dev_if:       An optional device interface index.
  32  * @transport:          The transport type used.
  33  * @net:                Network namespace containing the bound_dev_if net_dev.
  34  * @sgid_attr:          GID attribute to use for identified SGID
  35  */
  36 struct rdma_dev_addr {
  37         unsigned char src_dev_addr[MAX_ADDR_LEN];
  38         unsigned char dst_dev_addr[MAX_ADDR_LEN];
  39         unsigned char broadcast[MAX_ADDR_LEN];
  40         unsigned short dev_type;
  41         int bound_dev_if;
  42         enum rdma_transport_type transport;
  43         struct net *net;
  44         const struct ib_gid_attr *sgid_attr;
  45         enum rdma_network_type network;
  46         int hoplimit;
  47 };
  48
  49 /**
  50  * rdma_translate_ip - Translate a local IP address to an RDMA hardware
  51  *   address.
  52  *
  53  * The dev_addr->net field must be initialized.
  54  */
  55 int rdma_translate_ip(const struct sockaddr *addr,
  56                       struct rdma_dev_addr *dev_addr);
  57
  58 /**
  59  * rdma_resolve_ip - Resolve source and destination IP addresses to
  60  *   RDMA hardware addresses.
  61  * @src_addr: An optional source address to use in the resolution.  If a
  62  *   source address is not provided, a usable address will be returned via
  63  *   the callback.
  64  * @dst_addr: The destination address to resolve.
  65  * @addr: A reference to a data location that will receive the resolved
  66  *   addresses.  The data location must remain valid until the callback has
  67  *   been invoked. The net field of the addr struct must be valid.
  68  * @timeout_ms: Amount of time to wait for the address resolution to complete.
  69  * @callback: Call invoked once address resolution has completed, timed out,
  70  *   or been canceled.  A status of 0 indicates success.
  71  * @resolve_by_gid_attr:        Resolve the ip based on the GID attribute from
  72  *                              rdma_dev_addr.
  73  * @context: User-specified context associated with the call.
  74  */
  75 int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
  76                     struct rdma_dev_addr *addr, unsigned long timeout_ms,
  77                     void (*callback)(int status, struct sockaddr *src_addr,
  78                                      struct rdma_dev_addr *addr, void *context),
  79                     bool resolve_by_gid_attr, void *context);
  80
  81 void rdma_addr_cancel(struct rdma_dev_addr *addr);
  82
  83 int rdma_addr_size(const struct sockaddr *addr);
  84 int rdma_addr_size_in6(struct sockaddr_in6 *addr);
  85 int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr);
  86
  87 static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
  88 {
  89         return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
  90 }
  91
  92 static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
  93 {
  94         dev_addr->broadcast[8] = pkey >> 8;
  95         dev_addr->broadcast[9] = (unsigned char) pkey;
  96 }
  97
  98 static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr,
  99                                     union ib_gid *gid)
 100 {
 101         memcpy(gid, dev_addr->broadcast + 4, sizeof *gid);
 102 }
 103
 104 static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
 105 {
 106         return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
 107 }
 108
 109 static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
 110 {
 111         return is_vlan_dev(dev) ? vlan_dev_vlan_id(dev) : 0xffff;
 112 }
 113
 114 static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid)
 115 {
 116         switch (addr->sa_family) {
 117         case AF_INET:
 118                 ipv6_addr_set_v4mapped(((struct sockaddr_in *)
 119                                         addr)->sin_addr.s_addr,
 120                                        (struct in6_addr *)gid);
 121                 break;
 122         case AF_INET6:
 123                 *(struct in6_addr *)&gid->raw =
 124                         ((struct sockaddr_in6 *)addr)->sin6_addr;
 125                 break;
 126         default:
 127                 return -EINVAL;
 128         }
 129         return 0;
 130 }
 131
 132 /* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */
 133 static inline void rdma_gid2ip(struct sockaddr *out, const union ib_gid *gid)
 134 {
 135         if (ipv6_addr_v4mapped((struct in6_addr *)gid)) {
 136                 struct sockaddr_in *out_in = (struct sockaddr_in *)out;
 137                 memset(out_in, 0, sizeof(*out_in));
 138                 out_in->sin_family = AF_INET;
 139                 memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4);
 140         } else {
 141                 struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out;
 142                 memset(out_in, 0, sizeof(*out_in));
 143                 out_in->sin6_family = AF_INET6;
 144                 memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16);
 145         }
 146 }
 147
 148 /*
 149  * rdma_get/set_sgid/dgid() APIs are applicable to IB, and iWarp.
 150  * They are not applicable to RoCE.
 151  * RoCE GIDs are derived from the IP addresses.
 152  */
 153 static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 154 {
 155         memcpy(gid, dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr),
 156                sizeof(*gid));
 157 }
 158
 159 static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 160 {
 161         memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 162 }
 163
 164 static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 165 {
 166         memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
 167 }
 168
 169 static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 170 {
 171         memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 172 }
 173
 174 static inline enum ib_mtu iboe_get_mtu(int mtu)
 175 {
 176         /*
 177          * Reduce IB headers from effective IBoE MTU.
 178          */
 179         mtu = mtu - (IB_GRH_BYTES + IB_UDP_BYTES + IB_BTH_BYTES +
 180                      IB_EXT_XRC_BYTES + IB_EXT_ATOMICETH_BYTES +
 181                      IB_ICRC_BYTES);
 182
 183         if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
 184                 return IB_MTU_4096;
 185         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
 186                 return IB_MTU_2048;
 187         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
 188                 return IB_MTU_1024;
 189         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
 190                 return IB_MTU_512;
 191         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
 192                 return IB_MTU_256;
 193         else
 194                 return 0;
 195 }
 196
 197 static inline int rdma_link_local_addr(struct in6_addr *addr)
 198 {
 199         if (addr->s6_addr32[0] == htonl(0xfe800000) &&
 200             addr->s6_addr32[1] == 0)
 201                 return 1;
 202
 203         return 0;
 204 }
 205
 206 static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
 207 {
 208         memcpy(mac, &addr->s6_addr[8], 3);
 209         memcpy(mac + 3, &addr->s6_addr[13], 3);
 210         mac[0] ^= 2;
 211 }
 212
 213 static inline int rdma_is_multicast_addr(struct in6_addr *addr)
 214 {
 215         __be32 ipv4_addr;
 216
 217         if (addr->s6_addr[0] == 0xff)
 218                 return 1;
 219
 220         ipv4_addr = addr->s6_addr32[3];
 221         return (ipv6_addr_v4mapped(addr) && ipv4_is_multicast(ipv4_addr));
 222 }
 223
 224 static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
 225 {
 226         int i;
 227
 228         mac[0] = 0x33;
 229         mac[1] = 0x33;
 230         for (i = 2; i < 6; ++i)
 231                 mac[i] = addr->s6_addr[i + 10];
 232 }
 233
 234 static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
 235 {
 236         u16 vid;
 237
 238         vid = dgid->raw[11] << 8 | dgid->raw[12];
 239         return vid < 0x1000 ? vid : 0xffff;
 240 }
 241
 242 static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
 243 {
 244         return is_vlan_dev(dev) ? vlan_dev_real_dev(dev) : NULL;
 245 }
 246
 247 #endif /* IB_ADDR_H */