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67 * @(#)in.h 8.3 (Berkeley) 1/3/94
68 * $FreeBSD: src/sys/netinet/in.h,v 1.82 2003/10/25 09:37:10 ume Exp $
81 #include <netinet/in.h>
83 #include <rte_memcpy.h>
84 #include <rte_byteorder.h>
95 uint8_t version_ihl; /**< version and header length */
96 uint8_t type_of_service; /**< type of service */
97 uint16_t total_length; /**< length of packet */
98 uint16_t packet_id; /**< packet ID */
99 uint16_t fragment_offset; /**< fragmentation offset */
100 uint8_t time_to_live; /**< time to live */
101 uint8_t next_proto_id; /**< protocol ID */
102 uint16_t hdr_checksum; /**< header checksum */
103 uint32_t src_addr; /**< source address */
104 uint32_t dst_addr; /**< destination address */
105 } __attribute__((__packed__));
107 /** Create IPv4 address */
108 #define IPv4(a,b,c,d) ((uint32_t)(((a) & 0xff) << 24) | \
109 (((b) & 0xff) << 16) | \
110 (((c) & 0xff) << 8) | \
113 /* Fragment Offset * Flags. */
114 #define IPV4_HDR_DF_SHIFT 14
115 #define IPV4_HDR_MF_SHIFT 13
116 #define IPV4_HDR_FO_SHIFT 3
118 #define IPV4_HDR_DF_FLAG (1 << IPV4_HDR_DF_SHIFT)
119 #define IPV4_HDR_MF_FLAG (1 << IPV4_HDR_MF_SHIFT)
121 #define IPV4_HDR_OFFSET_MASK ((1 << IPV4_HDR_MF_SHIFT) - 1)
123 #define IPV4_HDR_OFFSET_UNITS 8
128 #define IPV4_ANY ((uint32_t)0x00000000) /**< 0.0.0.0 */
129 #define IPV4_LOOPBACK ((uint32_t)0x7f000001) /**< 127.0.0.1 */
130 #define IPV4_BROADCAST ((uint32_t)0xe0000000) /**< 224.0.0.0 */
131 #define IPV4_ALLHOSTS_GROUP ((uint32_t)0xe0000001) /**< 224.0.0.1 */
132 #define IPV4_ALLRTRS_GROUP ((uint32_t)0xe0000002) /**< 224.0.0.2 */
133 #define IPV4_MAX_LOCAL_GROUP ((uint32_t)0xe00000ff) /**< 224.0.0.255 */
136 * IPv4 Multicast-related macros
138 #define IPV4_MIN_MCAST IPv4(224, 0, 0, 0) /**< Minimal IPv4-multicast address */
139 #define IPV4_MAX_MCAST IPv4(239, 255, 255, 255) /**< Maximum IPv4 multicast address */
141 #define IS_IPV4_MCAST(x) \
142 ((x) >= IPV4_MIN_MCAST && (x) <= IPV4_MAX_MCAST) /**< check if IPv4 address is multicast */
145 * Process the non-complemented checksum of a buffer.
148 * Pointer to the buffer.
150 * Length of the buffer.
152 * The non-complemented checksum.
154 static inline uint16_t
155 rte_raw_cksum(const char *buf, size_t len)
157 /* workaround gcc strict-aliasing warning */
158 uintptr_t ptr = (uintptr_t)buf;
159 const uint16_t *u16 = (const uint16_t *)ptr;
162 while (len >= (sizeof(*u16) * 4)) {
167 len -= sizeof(*u16) * 4;
170 while (len >= sizeof(*u16)) {
176 /* if length is in odd bytes */
178 sum += *((const uint8_t *)u16);
180 sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
181 sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
182 return (uint16_t)sum;
186 * Process the IPv4 checksum of an IPv4 header.
188 * The checksum field must be set to 0 by the caller.
191 * The pointer to the contiguous IPv4 header.
193 * The complemented checksum to set in the IP packet.
195 static inline uint16_t
196 rte_ipv4_cksum(const struct ipv4_hdr *ipv4_hdr)
199 cksum = rte_raw_cksum((const char *)ipv4_hdr, sizeof(struct ipv4_hdr));
200 return ((cksum == 0xffff) ? cksum : ~cksum);
204 * Process the pseudo-header checksum of an IPv4 header.
206 * The checksum field must be set to 0 by the caller.
208 * Depending on the ol_flags, the pseudo-header checksum expected by the
209 * drivers is not the same. For instance, when TSO is enabled, the IP
210 * payload length must not be included in the packet.
212 * When ol_flags is 0, it computes the standard pseudo-header checksum.
215 * The pointer to the contiguous IPv4 header.
217 * The ol_flags of the associated mbuf.
219 * The non-complemented checksum to set in the L4 header.
221 static inline uint16_t
222 rte_ipv4_phdr_cksum(const struct ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
224 struct ipv4_psd_header {
225 uint32_t src_addr; /* IP address of source host. */
226 uint32_t dst_addr; /* IP address of destination host. */
227 uint8_t zero; /* zero. */
228 uint8_t proto; /* L4 protocol type. */
229 uint16_t len; /* L4 length. */
232 psd_hdr.src_addr = ipv4_hdr->src_addr;
233 psd_hdr.dst_addr = ipv4_hdr->dst_addr;
235 psd_hdr.proto = ipv4_hdr->next_proto_id;
236 if (ol_flags & PKT_TX_TCP_SEG) {
239 psd_hdr.len = rte_cpu_to_be_16(
240 (uint16_t)(rte_be_to_cpu_16(ipv4_hdr->total_length)
241 - sizeof(struct ipv4_hdr)));
243 return rte_raw_cksum((const char *)&psd_hdr, sizeof(psd_hdr));
247 * Process the IPv4 UDP or TCP checksum.
249 * The IPv4 header should not contains options. The IP and layer 4
250 * checksum must be set to 0 in the packet by the caller.
253 * The pointer to the contiguous IPv4 header.
255 * The pointer to the beginning of the L4 header.
257 * The complemented checksum to set in the IP packet.
259 static inline uint16_t
260 rte_ipv4_udptcp_cksum(const struct ipv4_hdr *ipv4_hdr, const void *l4_hdr)
265 l4_len = rte_be_to_cpu_16(ipv4_hdr->total_length) -
266 sizeof(struct ipv4_hdr);
268 cksum = rte_raw_cksum(l4_hdr, l4_len);
269 cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0);
271 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
272 cksum = (~cksum) & 0xffff;
283 uint32_t vtc_flow; /**< IP version, traffic class & flow label. */
284 uint16_t payload_len; /**< IP packet length - includes sizeof(ip_header). */
285 uint8_t proto; /**< Protocol, next header. */
286 uint8_t hop_limits; /**< Hop limits. */
287 uint8_t src_addr[16]; /**< IP address of source host. */
288 uint8_t dst_addr[16]; /**< IP address of destination host(s). */
289 } __attribute__((__packed__));
292 * Process the pseudo-header checksum of an IPv6 header.
294 * Depending on the ol_flags, the pseudo-header checksum expected by the
295 * drivers is not the same. For instance, when TSO is enabled, the IPv6
296 * payload length must not be included in the packet.
298 * When ol_flags is 0, it computes the standard pseudo-header checksum.
301 * The pointer to the contiguous IPv6 header.
303 * The ol_flags of the associated mbuf.
305 * The non-complemented checksum to set in the L4 header.
307 static inline uint16_t
308 rte_ipv6_phdr_cksum(const struct ipv6_hdr *ipv6_hdr, uint64_t ol_flags)
310 struct ipv6_psd_header {
311 uint8_t src_addr[16]; /* IP address of source host. */
312 uint8_t dst_addr[16]; /* IP address of destination host. */
313 uint32_t len; /* L4 length. */
314 uint32_t proto; /* L4 protocol - top 3 bytes must be zero */
317 rte_memcpy(&psd_hdr.src_addr, ipv6_hdr->src_addr,
318 sizeof(ipv6_hdr->src_addr) + sizeof(ipv6_hdr->dst_addr));
319 psd_hdr.proto = (ipv6_hdr->proto << 24);
320 if (ol_flags & PKT_TX_TCP_SEG) {
323 psd_hdr.len = ipv6_hdr->payload_len;
326 return rte_raw_cksum((const char *)&psd_hdr, sizeof(psd_hdr));
330 * Process the IPv6 UDP or TCP checksum.
332 * The IPv4 header should not contains options. The layer 4 checksum
333 * must be set to 0 in the packet by the caller.
336 * The pointer to the contiguous IPv6 header.
338 * The pointer to the beginning of the L4 header.
340 * The complemented checksum to set in the IP packet.
342 static inline uint16_t
343 rte_ipv6_udptcp_cksum(const struct ipv6_hdr *ipv6_hdr, const void *l4_hdr)
348 l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len);
350 cksum = rte_raw_cksum(l4_hdr, l4_len);
351 cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0);
353 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
354 cksum = (~cksum) & 0xffff;
365 #endif /* _RTE_IP_H_ */