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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 
ib_addr_get_pkey(struct rdma_dev_addr * dev_addr)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 
ib_addr_set_pkey(struct rdma_dev_addr * dev_addr,u16 pkey)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 
ib_addr_get_mgid(struct rdma_dev_addr * dev_addr,union ib_gid * gid)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 
rdma_addr_gid_offset(struct rdma_dev_addr * dev_addr)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 
rdma_vlan_dev_vlan_id(const struct net_device * dev)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 
rdma_ip2gid(struct sockaddr * addr,union ib_gid * gid)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 */
rdma_gid2ip(struct sockaddr * out,const union ib_gid * gid)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  */
rdma_addr_get_sgid(struct rdma_dev_addr * dev_addr,union ib_gid * gid)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 
rdma_addr_set_sgid(struct rdma_dev_addr * dev_addr,union ib_gid * gid)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 
rdma_addr_get_dgid(struct rdma_dev_addr * dev_addr,union ib_gid * gid)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 
rdma_addr_set_dgid(struct rdma_dev_addr * dev_addr,union ib_gid * gid)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 
iboe_get_mtu(int mtu)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 
rdma_link_local_addr(struct in6_addr * addr)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 
rdma_get_ll_mac(struct in6_addr * addr,u8 * mac)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 
rdma_is_multicast_addr(struct in6_addr * addr)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 
rdma_get_mcast_mac(struct in6_addr * addr,u8 * mac)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 
rdma_get_vlan_id(union ib_gid * dgid)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 
rdma_vlan_dev_real_dev(const struct net_device * dev)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 */
248