/*
* Copyright (c) 2004 Topspin Corporation. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/export.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <rdma/ib_pack.h>
#define STRUCT_FIELD(header, field) \
.struct_offset_bytes = offsetof(struct ib_unpacked_ ## header, field), \
.struct_size_bytes = sizeof ((struct ib_unpacked_ ## header *) 0)->field, \
.field_name = #header ":" #field
static const struct ib_field lrh_table[] = {
{ STRUCT_FIELD(lrh, virtual_lane),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 4 },
{ STRUCT_FIELD(lrh, link_version),
.offset_words = 0,
.offset_bits = 4,
.size_bits = 4 },
{ STRUCT_FIELD(lrh, service_level),
.offset_words = 0,
.offset_bits = 8,
.size_bits = 4 },
{ RESERVED,
.offset_words = 0,
.offset_bits = 12,
.size_bits = 2 },
{ STRUCT_FIELD(lrh, link_next_header),
.offset_words = 0,
.offset_bits = 14,
.size_bits = 2 },
{ STRUCT_FIELD(lrh, destination_lid),
.offset_words = 0,
.offset_bits = 16,
.size_bits = 16 },
{ RESERVED,
.offset_words = 1,
.offset_bits = 0,
.size_bits = 5 },
{ STRUCT_FIELD(lrh, packet_length),
.offset_words = 1,
.offset_bits = 5,
.size_bits = 11 },
{ STRUCT_FIELD(lrh, source_lid),
.offset_words = 1,
.offset_bits = 16,
.size_bits = 16 }
};
static const struct ib_field eth_table[] = {
{ STRUCT_FIELD(eth, dmac_h),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 32 },
{ STRUCT_FIELD(eth, dmac_l),
.offset_words = 1,
.offset_bits = 0,
.size_bits = 16 },
{ STRUCT_FIELD(eth, smac_h),
.offset_words = 1,
.offset_bits = 16,
.size_bits = 16 },
{ STRUCT_FIELD(eth, smac_l),
.offset_words = 2,
.offset_bits = 0,
.size_bits = 32 },
{ STRUCT_FIELD(eth, type),
.offset_words = 3,
.offset_bits = 0,
.size_bits = 16 }
};
static const struct ib_field vlan_table[] = {
{ STRUCT_FIELD(vlan, tag),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 16 },
{ STRUCT_FIELD(vlan, type),
.offset_words = 0,
.offset_bits = 16,
.size_bits = 16 }
};
static const struct ib_field ip4_table[] = {
{ STRUCT_FIELD(ip4, ver),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 4 },
{ STRUCT_FIELD(ip4, hdr_len),
.offset_words = 0,
.offset_bits = 4,
.size_bits = 4 },
{ STRUCT_FIELD(ip4, tos),
.offset_words = 0,
.offset_bits = 8,
.size_bits = 8 },
{ STRUCT_FIELD(ip4, tot_len),
.offset_words = 0,
.offset_bits = 16,
.size_bits = 16 },
{ STRUCT_FIELD(ip4, id),
.offset_words = 1,
.offset_bits = 0,
.size_bits = 16 },
{ STRUCT_FIELD(ip4, frag_off),
.offset_words = 1,
.offset_bits = 16,
.size_bits = 16 },
{ STRUCT_FIELD(ip4, ttl),
.offset_words = 2,
.offset_bits = 0,
.size_bits = 8 },
{ STRUCT_FIELD(ip4, protocol),
.offset_words = 2,
.offset_bits = 8,
.size_bits = 8 },
{ STRUCT_FIELD(ip4, check),
.offset_words = 2,
.offset_bits = 16,
.size_bits = 16 },
{ STRUCT_FIELD(ip4, saddr),
.offset_words = 3,
.offset_bits = 0,
.size_bits = 32 },
{ STRUCT_FIELD(ip4, daddr),
.offset_words = 4,
.offset_bits = 0,
.size_bits = 32 }
};
static const struct ib_field udp_table[] = {
{ STRUCT_FIELD(udp, sport),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 16 },
{ STRUCT_FIELD(udp, dport),
.offset_words = 0,
.offset_bits = 16,
.size_bits = 16 },
{ STRUCT_FIELD(udp, length),
.offset_words = 1,
.offset_bits = 0,
.size_bits = 16 },
{ STRUCT_FIELD(udp, csum),
.offset_words = 1,
.offset_bits = 16,
.size_bits = 16 }
};
static const struct ib_field grh_table[] = {
{ STRUCT_FIELD(grh, ip_version),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 4 },
{ STRUCT_FIELD(grh, traffic_class),
.offset_words = 0,
.offset_bits = 4,
.size_bits = 8 },
{ STRUCT_FIELD(grh, flow_label),
.offset_words = 0,
.offset_bits = 12,
.size_bits = 20 },
{ STRUCT_FIELD(grh, payload_length),
.offset_words = 1,
.offset_bits = 0,
.size_bits = 16 },
{ STRUCT_FIELD(grh, next_header),
.offset_words = 1,
.offset_bits = 16,
.size_bits = 8 },
{ STRUCT_FIELD(grh, hop_limit),
.offset_words = 1,
.offset_bits = 24,
.size_bits = 8 },
{ STRUCT_FIELD(grh, source_gid),
.offset_words = 2,
.offset_bits = 0,
.size_bits = 128 },
{ STRUCT_FIELD(grh, destination_gid),
.offset_words = 6,
.offset_bits = 0,
.size_bits = 128 }
};
static const struct ib_field bth_table[] = {
{ STRUCT_FIELD(bth, opcode),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 8 },
{ STRUCT_FIELD(bth, solicited_event),
.offset_words = 0,
.offset_bits = 8,
.size_bits = 1 },
{ STRUCT_FIELD(bth, mig_req),
.offset_words = 0,
.offset_bits = 9,
.size_bits = 1 },
{ STRUCT_FIELD(bth, pad_count),
.offset_words = 0,
.offset_bits = 10,
.size_bits = 2 },
{ STRUCT_FIELD(bth, transport_header_version),
.offset_words = 0,
.offset_bits = 12,
.size_bits = 4 },
{ STRUCT_FIELD(bth, pkey),
.offset_words = 0,
.offset_bits = 16,
.size_bits = 16 },
{ RESERVED,
.offset_words = 1,
.offset_bits = 0,
.size_bits = 8 },
{ STRUCT_FIELD(bth, destination_qpn),
.offset_words = 1,
.offset_bits = 8,
.size_bits = 24 },
{ STRUCT_FIELD(bth, ack_req),
.offset_words = 2,
.offset_bits = 0,
.size_bits = 1 },
{ RESERVED,
.offset_words = 2,
.offset_bits = 1,
.size_bits = 7 },
{ STRUCT_FIELD(bth, psn),
.offset_words = 2,
.offset_bits = 8,
.size_bits = 24 }
};
static const struct ib_field deth_table[] = {
{ STRUCT_FIELD(deth, qkey),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 32 },
{ RESERVED,
.offset_words = 1,
.offset_bits = 0,
.size_bits = 8 },
{ STRUCT_FIELD(deth, source_qpn),
.offset_words = 1,
.offset_bits = 8,
.size_bits = 24 }
};
__sum16 ib_ud_ip4_csum(struct ib_ud_header *header)
{
struct iphdr iph;
iph.ihl = 5;
iph.version = 4;
iph.tos = header->ip4.tos;
iph.tot_len = header->ip4.tot_len;
iph.id = header->ip4.id;
iph.frag_off = header->ip4.frag_off;
iph.ttl = header->ip4.ttl;
iph.protocol = header->ip4.protocol;
iph.check = 0;
iph.saddr = header->ip4.saddr;
iph.daddr = header->ip4.daddr;
return ip_fast_csum((u8 *)&iph, iph.ihl);
}
EXPORT_SYMBOL(ib_ud_ip4_csum);
/**
* ib_ud_header_init - Initialize UD header structure
* @payload_bytes:Length of packet payload
* @lrh_present: specify if LRH is present
* @eth_present: specify if Eth header is present
* @vlan_present: packet is tagged vlan
* @grh_present: GRH flag (if non-zero, GRH will be included)
* @ip_version: if non-zero, IP header, V4 or V6, will be included
* @udp_present :if non-zero, UDP header will be included
* @immediate_present: specify if immediate data is present
* @header:Structure to initialize
*/
int ib_ud_header_init(int payload_bytes,
int lrh_present,
int eth_present,
int vlan_present,
int grh_present,
int ip_version,
int udp_present,
int immediate_present,
struct ib_ud_header *header)
{
size_t udp_bytes = udp_present ? IB_UDP_BYTES : 0;
grh_present = grh_present && !ip_version;
memset(header, 0, sizeof *header);
/*
* UDP header without IP header doesn't make sense
*/
if (udp_present && ip_version != 4 && ip_version != 6)
return -EINVAL;
if (lrh_present) {
u16 packet_length;
header->lrh.link_version = 0;
header->lrh.link_next_header =
grh_present ? IB_LNH_IBA_GLOBAL : IB_LNH_IBA_LOCAL;
packet_length = (IB_LRH_BYTES +
IB_BTH_BYTES +
IB_DETH_BYTES +
(grh_present ? IB_GRH_BYTES : 0) +
payload_bytes +
4 + /* ICRC */
3) / 4; /* round up */
header->lrh.packet_length = cpu_to_be16(packet_length);
}
if (vlan_present)
header->eth.type = cpu_to_be16(ETH_P_8021Q);
if (ip_version == 6 || grh_present) {
header->grh.ip_version = 6;
header->grh.payload_length =
cpu_to_be16((udp_bytes +
IB_BTH_BYTES +
IB_DETH_BYTES +
payload_bytes +
4 + /* ICRC */
3) & ~3); /* round up */
header->grh.next_header = udp_present ? IPPROTO_UDP : 0x1b;
}
if (ip_version == 4) {
header->ip4.ver = 4; /* version 4 */
header->ip4.hdr_len = 5; /* 5 words */
header->ip4.tot_len =
cpu_to_be16(IB_IP4_BYTES +
udp_bytes +
IB_BTH_BYTES +
IB_DETH_BYTES +
payload_bytes +
4); /* ICRC */
header->ip4.protocol = IPPROTO_UDP;
}
if (udp_present && ip_version)
header->udp.length =
cpu_to_be16(IB_UDP_BYTES +
IB_BTH_BYTES +
IB_DETH_BYTES +
payload_bytes +
4); /* ICRC */
if (immediate_present)
header->bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
else
header->bth.opcode = IB_OPCODE_UD_SEND_ONLY;
header->bth.pad_count = (4 - payload_bytes) & 3;
header->bth.transport_header_version = 0;
header->lrh_present = lrh_present;
header->eth_present = eth_present;
header->vlan_present = vlan_present;
header->grh_present = grh_present || (ip_version == 6);
header->ipv4_present = ip_version == 4;
header->udp_present = udp_present;
header->immediate_present = immediate_present;
return 0;
}
EXPORT_SYMBOL(ib_ud_header_init);
/**
* ib_ud_header_pack - Pack UD header struct into wire format
* @header:UD header struct
* @buf:Buffer to pack into
*
* ib_ud_header_pack() packs the UD header structure @header into wire
* format in the buffer @buf.
*/
int ib_ud_header_pack(struct ib_ud_header *header,
void *buf)
{
int len = 0;
if (header->lrh_present) {
ib_pack(lrh_table, ARRAY_SIZE(lrh_table),
&header->lrh, buf + len);
len += IB_LRH_BYTES;
}
if (header->eth_present) {
ib_pack(eth_table, ARRAY_SIZE(eth_table),
&header->eth, buf + len);
len += IB_ETH_BYTES;
}
if (header->vlan_present) {
ib_pack(vlan_table, ARRAY_SIZE(vlan_table),
&header->vlan, buf + len);
len += IB_VLAN_BYTES;
}
if (header->grh_present) {
ib_pack(grh_table, ARRAY_SIZE(grh_table),
&header->grh, buf + len);
len += IB_GRH_BYTES;
}
if (header->ipv4_present) {
ib_pack(ip4_table, ARRAY_SIZE(ip4_table),
&header->ip4, buf + len);
len += IB_IP4_BYTES;
}
if (header->udp_present) {
ib_pack(udp_table, ARRAY_SIZE(udp_table),
&header->udp, buf + len);
len += IB_UDP_BYTES;
}
ib_pack(bth_table, ARRAY_SIZE(bth_table),
&header->bth, buf + len);
len += IB_BTH_BYTES;
ib_pack(deth_table, ARRAY_SIZE(deth_table),
&header->deth, buf + len);
len += IB_DETH_BYTES;
if (header->immediate_present) {
memcpy(buf + len, &header->immediate_data, sizeof header->immediate_data);
len += sizeof header->immediate_data;
}
return len;
}
EXPORT_SYMBOL(ib_ud_header_pack);
/**
* ib_ud_header_unpack - Unpack UD header struct from wire format
* @header:UD header struct
* @buf:Buffer to pack into
*
* ib_ud_header_pack() unpacks the UD header structure @header from wire
* format in the buffer @buf.
*/
int ib_ud_header_unpack(void *buf,
struct ib_ud_header *header)
{
ib_unpack(lrh_table, ARRAY_SIZE(lrh_table),
buf, &header->lrh);
buf += IB_LRH_BYTES;
if (header->lrh.link_version != 0) {
pr_warn("Invalid LRH.link_version %d\n",
header->lrh.link_version);
return -EINVAL;
}
switch (header->lrh.link_next_header) {
case IB_LNH_IBA_LOCAL:
header->grh_present = 0;
break;
case IB_LNH_IBA_GLOBAL:
header->grh_present = 1;
ib_unpack(grh_table, ARRAY_SIZE(grh_table),
buf, &header->grh);
buf += IB_GRH_BYTES;
if (header->grh.ip_version != 6) {
pr_warn("Invalid GRH.ip_version %d\n",
header->grh.ip_version);
return -EINVAL;
}
if (header->grh.next_header != 0x1b) {
pr_warn("Invalid GRH.next_header 0x%02x\n",
header->grh.next_header);
return -EINVAL;
}
break;
default:
pr_warn("Invalid LRH.link_next_header %d\n",
header->lrh.link_next_header);
return -EINVAL;
}
ib_unpack(bth_table, ARRAY_SIZE(bth_table),
buf, &header->bth);
buf += IB_BTH_BYTES;
switch (header->bth.opcode) {
case IB_OPCODE_UD_SEND_ONLY:
header->immediate_present = 0;
break;
case IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE:
header->immediate_present = 1;
break;
default:
pr_warn("Invalid BTH.opcode 0x%02x\n", header->bth.opcode);
return -EINVAL;
}
if (header->bth.transport_header_version != 0) {
pr_warn("Invalid BTH.transport_header_version %d\n",
header->bth.transport_header_version);
return -EINVAL;
}
ib_unpack(deth_table, ARRAY_SIZE(deth_table),
buf, &header->deth);
buf += IB_DETH_BYTES;
if (header->immediate_present)
memcpy(&header->immediate_data, buf, sizeof header->immediate_data);
return 0;
}
EXPORT_SYMBOL(ib_ud_header_unpack);
