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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 /** Internet header length mask for version_ihl field */
114 #define IPV4_HDR_IHL_MASK (0x0f)
116 * Internet header length field multiplier (IHL field specifies overall header
117 * length in number of 4-byte words)
119 #define IPV4_IHL_MULTIPLIER (4)
121 /* Fragment Offset * Flags. */
122 #define IPV4_HDR_DF_SHIFT 14
123 #define IPV4_HDR_MF_SHIFT 13
124 #define IPV4_HDR_FO_SHIFT 3
126 #define IPV4_HDR_DF_FLAG (1 << IPV4_HDR_DF_SHIFT)
127 #define IPV4_HDR_MF_FLAG (1 << IPV4_HDR_MF_SHIFT)
129 #define IPV4_HDR_OFFSET_MASK ((1 << IPV4_HDR_MF_SHIFT) - 1)
131 #define IPV4_HDR_OFFSET_UNITS 8
136 #define IPV4_ANY ((uint32_t)0x00000000) /**< 0.0.0.0 */
137 #define IPV4_LOOPBACK ((uint32_t)0x7f000001) /**< 127.0.0.1 */
138 #define IPV4_BROADCAST ((uint32_t)0xe0000000) /**< 224.0.0.0 */
139 #define IPV4_ALLHOSTS_GROUP ((uint32_t)0xe0000001) /**< 224.0.0.1 */
140 #define IPV4_ALLRTRS_GROUP ((uint32_t)0xe0000002) /**< 224.0.0.2 */
141 #define IPV4_MAX_LOCAL_GROUP ((uint32_t)0xe00000ff) /**< 224.0.0.255 */
144 * IPv4 Multicast-related macros
146 #define IPV4_MIN_MCAST IPv4(224, 0, 0, 0) /**< Minimal IPv4-multicast address */
147 #define IPV4_MAX_MCAST IPv4(239, 255, 255, 255) /**< Maximum IPv4 multicast address */
149 #define IS_IPV4_MCAST(x) \
150 ((x) >= IPV4_MIN_MCAST && (x) <= IPV4_MAX_MCAST) /**< check if IPv4 address is multicast */
153 * @internal Calculate a sum of all words in the buffer.
154 * Helper routine for the rte_raw_cksum().
157 * Pointer to the buffer.
159 * Length of the buffer.
161 * Initial value of the sum.
163 * sum += Sum of all words in the buffer.
165 static inline uint32_t
166 __rte_raw_cksum(const void *buf, size_t len, uint32_t sum)
168 /* workaround gcc strict-aliasing warning */
169 uintptr_t ptr = (uintptr_t)buf;
170 const uint16_t *u16 = (const uint16_t *)ptr;
172 while (len >= (sizeof(*u16) * 4)) {
177 len -= sizeof(*u16) * 4;
180 while (len >= sizeof(*u16)) {
186 /* if length is in odd bytes */
188 sum += *((const uint8_t *)u16);
194 * @internal Reduce a sum to the non-complemented checksum.
195 * Helper routine for the rte_raw_cksum().
200 * The non-complemented checksum.
202 static inline uint16_t
203 __rte_raw_cksum_reduce(uint32_t sum)
205 sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
206 sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
207 return (uint16_t)sum;
211 * Process the non-complemented checksum of a buffer.
214 * Pointer to the buffer.
216 * Length of the buffer.
218 * The non-complemented checksum.
220 static inline uint16_t
221 rte_raw_cksum(const void *buf, size_t len)
225 sum = __rte_raw_cksum(buf, len, 0);
226 return __rte_raw_cksum_reduce(sum);
230 * Process the IPv4 checksum of an IPv4 header.
232 * The checksum field must be set to 0 by the caller.
235 * The pointer to the contiguous IPv4 header.
237 * The complemented checksum to set in the IP packet.
239 static inline uint16_t
240 rte_ipv4_cksum(const struct ipv4_hdr *ipv4_hdr)
243 cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct ipv4_hdr));
244 return ((cksum == 0xffff) ? cksum : ~cksum);
248 * Process the pseudo-header checksum of an IPv4 header.
250 * The checksum field must be set to 0 by the caller.
252 * Depending on the ol_flags, the pseudo-header checksum expected by the
253 * drivers is not the same. For instance, when TSO is enabled, the IP
254 * payload length must not be included in the packet.
256 * When ol_flags is 0, it computes the standard pseudo-header checksum.
259 * The pointer to the contiguous IPv4 header.
261 * The ol_flags of the associated mbuf.
263 * The non-complemented checksum to set in the L4 header.
265 static inline uint16_t
266 rte_ipv4_phdr_cksum(const struct ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
268 struct ipv4_psd_header {
269 uint32_t src_addr; /* IP address of source host. */
270 uint32_t dst_addr; /* IP address of destination host. */
271 uint8_t zero; /* zero. */
272 uint8_t proto; /* L4 protocol type. */
273 uint16_t len; /* L4 length. */
276 psd_hdr.src_addr = ipv4_hdr->src_addr;
277 psd_hdr.dst_addr = ipv4_hdr->dst_addr;
279 psd_hdr.proto = ipv4_hdr->next_proto_id;
280 if (ol_flags & PKT_TX_TCP_SEG) {
283 psd_hdr.len = rte_cpu_to_be_16(
284 (uint16_t)(rte_be_to_cpu_16(ipv4_hdr->total_length)
285 - sizeof(struct ipv4_hdr)));
287 return rte_raw_cksum(&psd_hdr, sizeof(psd_hdr));
291 * Process the IPv4 UDP or TCP checksum.
293 * The IPv4 header should not contains options. The IP and layer 4
294 * checksum must be set to 0 in the packet by the caller.
297 * The pointer to the contiguous IPv4 header.
299 * The pointer to the beginning of the L4 header.
301 * The complemented checksum to set in the IP packet.
303 static inline uint16_t
304 rte_ipv4_udptcp_cksum(const struct ipv4_hdr *ipv4_hdr, const void *l4_hdr)
309 l4_len = rte_be_to_cpu_16(ipv4_hdr->total_length) -
310 sizeof(struct ipv4_hdr);
312 cksum = rte_raw_cksum(l4_hdr, l4_len);
313 cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0);
315 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
316 cksum = (~cksum) & 0xffff;
327 uint32_t vtc_flow; /**< IP version, traffic class & flow label. */
328 uint16_t payload_len; /**< IP packet length - includes sizeof(ip_header). */
329 uint8_t proto; /**< Protocol, next header. */
330 uint8_t hop_limits; /**< Hop limits. */
331 uint8_t src_addr[16]; /**< IP address of source host. */
332 uint8_t dst_addr[16]; /**< IP address of destination host(s). */
333 } __attribute__((__packed__));
336 * Process the pseudo-header checksum of an IPv6 header.
338 * Depending on the ol_flags, the pseudo-header checksum expected by the
339 * drivers is not the same. For instance, when TSO is enabled, the IPv6
340 * payload length must not be included in the packet.
342 * When ol_flags is 0, it computes the standard pseudo-header checksum.
345 * The pointer to the contiguous IPv6 header.
347 * The ol_flags of the associated mbuf.
349 * The non-complemented checksum to set in the L4 header.
351 static inline uint16_t
352 rte_ipv6_phdr_cksum(const struct ipv6_hdr *ipv6_hdr, uint64_t ol_flags)
356 uint32_t len; /* L4 length. */
357 uint32_t proto; /* L4 protocol - top 3 bytes must be zero */
360 psd_hdr.proto = (ipv6_hdr->proto << 24);
361 if (ol_flags & PKT_TX_TCP_SEG) {
364 psd_hdr.len = ipv6_hdr->payload_len;
367 sum = __rte_raw_cksum(ipv6_hdr->src_addr,
368 sizeof(ipv6_hdr->src_addr) + sizeof(ipv6_hdr->dst_addr),
370 sum = __rte_raw_cksum(&psd_hdr, sizeof(psd_hdr), sum);
371 return __rte_raw_cksum_reduce(sum);
375 * Process the IPv6 UDP or TCP checksum.
377 * The IPv4 header should not contains options. The layer 4 checksum
378 * must be set to 0 in the packet by the caller.
381 * The pointer to the contiguous IPv6 header.
383 * The pointer to the beginning of the L4 header.
385 * The complemented checksum to set in the IP packet.
387 static inline uint16_t
388 rte_ipv6_udptcp_cksum(const struct ipv6_hdr *ipv6_hdr, const void *l4_hdr)
393 l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len);
395 cksum = rte_raw_cksum(l4_hdr, l4_len);
396 cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0);
398 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
399 cksum = (~cksum) & 0xffff;
410 #endif /* _RTE_IP_H_ */