* Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
* All rights reserved.
*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
+ * 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
+ * * 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
+ * * 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.
- * * Neither the name of Intel Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
*/
#include <stdarg.h>
#define IP_HDRLEN 0x05 /* default IP header length == five 32-bits words. */
#define IP_VHL_DEF (IP_VERSION | IP_HDRLEN)
-/* Pseudo Header for IPv4/UDP/TCP checksum */
-struct psd_header {
- uint32_t src_addr; /* IP address of source host. */
- uint32_t dst_addr; /* IP address of destination host(s). */
- uint8_t zero; /* zero. */
- uint8_t proto; /* L4 protocol type. */
- uint16_t len; /* L4 length. */
-} __attribute__((__packed__));
-
-
-/* Pseudo Header for IPv6/UDP/TCP checksum */
-struct ipv6_psd_header {
- uint8_t src_addr[16]; /* IP address of source host. */
- uint8_t dst_addr[16]; /* IP address of destination host(s). */
- uint32_t len; /* L4 length. */
- uint8_t zero[3]; /* zero. */
- uint8_t proto; /* L4 protocol. */
-} __attribute__((__packed__));
-
-
static inline uint16_t
get_16b_sum(uint16_t *ptr16, uint32_t nr)
{
static inline uint16_t
get_ipv4_psd_sum (struct ipv4_hdr * ip_hdr)
{
- struct psd_header psd_hdr;
+ /* Pseudo Header for IPv4/UDP/TCP checksum */
+ union ipv4_psd_header {
+ struct {
+ uint32_t src_addr; /* IP address of source host. */
+ uint32_t dst_addr; /* IP address of destination host(s). */
+ uint8_t zero; /* zero. */
+ uint8_t proto; /* L4 protocol type. */
+ uint16_t len; /* L4 length. */
+ } __attribute__((__packed__));
+ uint16_t u16_arr[0];
+ } psd_hdr;
+
psd_hdr.src_addr = ip_hdr->src_addr;
psd_hdr.dst_addr = ip_hdr->dst_addr;
psd_hdr.zero = 0;
psd_hdr.proto = ip_hdr->next_proto_id;
psd_hdr.len = rte_cpu_to_be_16((uint16_t)(rte_be_to_cpu_16(ip_hdr->total_length)
- sizeof(struct ipv4_hdr)));
- return get_16b_sum((uint16_t*)&psd_hdr, sizeof(struct psd_header));
+ return get_16b_sum(psd_hdr.u16_arr, sizeof(psd_hdr));
}
static inline uint16_t
get_ipv6_psd_sum (struct ipv6_hdr * ip_hdr)
{
- struct ipv6_psd_header psd_hdr;
- rte_memcpy(&psd_hdr.src_addr, ip_hdr->src_addr, sizeof(ip_hdr->src_addr)
- + sizeof(ip_hdr->dst_addr));
-
- psd_hdr.zero[0] = 0;
- psd_hdr.zero[1] = 0;
- psd_hdr.zero[2] = 0;
- psd_hdr.proto = ip_hdr->proto;
+ /* Pseudo Header for IPv6/UDP/TCP checksum */
+ union ipv6_psd_header {
+ struct {
+ uint8_t src_addr[16]; /* IP address of source host. */
+ uint8_t dst_addr[16]; /* IP address of destination host(s). */
+ uint32_t len; /* L4 length. */
+ uint32_t proto; /* L4 protocol - top 3 bytes must be zero */
+ } __attribute__((__packed__));
+
+ uint16_t u16_arr[0]; /* allow use as 16-bit values with safe aliasing */
+ } psd_hdr;
+
+ rte_memcpy(&psd_hdr.src_addr, ip_hdr->src_addr,
+ sizeof(ip_hdr->src_addr) + sizeof(ip_hdr->dst_addr));
psd_hdr.len = ip_hdr->payload_len;
+ psd_hdr.proto = (ip_hdr->proto << 24);
- return get_16b_sum((uint16_t*)&psd_hdr, sizeof(struct ipv6_psd_header));
+ return get_16b_sum(psd_hdr.u16_arr, sizeof(psd_hdr));
}
static inline uint16_t
git.droids-corp.org / dpdk.git / blobdiff