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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_byteorder.h>
94 uint8_t version_ihl; /**< version and header length */
95 uint8_t type_of_service; /**< type of service */
96 uint16_t total_length; /**< length of packet */
97 uint16_t packet_id; /**< packet ID */
98 uint16_t fragment_offset; /**< fragmentation offset */
99 uint8_t time_to_live; /**< time to live */
100 uint8_t next_proto_id; /**< protocol ID */
101 uint16_t hdr_checksum; /**< header checksum */
102 uint32_t src_addr; /**< source address */
103 uint32_t dst_addr; /**< destination address */
104 } __attribute__((__packed__));
106 /** Create IPv4 address */
107 #define IPv4(a,b,c,d) ((uint32_t)(((a) & 0xff) << 24) | \
108 (((b) & 0xff) << 16) | \
109 (((c) & 0xff) << 8) | \
112 /** Maximal IPv4 packet length (including a header) */
113 #define IPV4_MAX_PKT_LEN 65535
115 /** Internet header length mask for version_ihl field */
116 #define IPV4_HDR_IHL_MASK (0x0f)
118 * Internet header length field multiplier (IHL field specifies overall header
119 * length in number of 4-byte words)
121 #define IPV4_IHL_MULTIPLIER (4)
123 /* Fragment Offset * Flags. */
124 #define IPV4_HDR_DF_SHIFT 14
125 #define IPV4_HDR_MF_SHIFT 13
126 #define IPV4_HDR_FO_SHIFT 3
128 #define IPV4_HDR_DF_FLAG (1 << IPV4_HDR_DF_SHIFT)
129 #define IPV4_HDR_MF_FLAG (1 << IPV4_HDR_MF_SHIFT)
131 #define IPV4_HDR_OFFSET_MASK ((1 << IPV4_HDR_MF_SHIFT) - 1)
133 #define IPV4_HDR_OFFSET_UNITS 8
138 #define IPV4_ANY ((uint32_t)0x00000000) /**< 0.0.0.0 */
139 #define IPV4_LOOPBACK ((uint32_t)0x7f000001) /**< 127.0.0.1 */
140 #define IPV4_BROADCAST ((uint32_t)0xe0000000) /**< 224.0.0.0 */
141 #define IPV4_ALLHOSTS_GROUP ((uint32_t)0xe0000001) /**< 224.0.0.1 */
142 #define IPV4_ALLRTRS_GROUP ((uint32_t)0xe0000002) /**< 224.0.0.2 */
143 #define IPV4_MAX_LOCAL_GROUP ((uint32_t)0xe00000ff) /**< 224.0.0.255 */
146 * IPv4 Multicast-related macros
148 #define IPV4_MIN_MCAST IPv4(224, 0, 0, 0) /**< Minimal IPv4-multicast address */
149 #define IPV4_MAX_MCAST IPv4(239, 255, 255, 255) /**< Maximum IPv4 multicast address */
151 #define IS_IPV4_MCAST(x) \
152 ((x) >= IPV4_MIN_MCAST && (x) <= IPV4_MAX_MCAST) /**< check if IPv4 address is multicast */
155 * @internal Calculate a sum of all words in the buffer.
156 * Helper routine for the rte_raw_cksum().
159 * Pointer to the buffer.
161 * Length of the buffer.
163 * Initial value of the sum.
165 * sum += Sum of all words in the buffer.
167 static inline uint32_t
168 __rte_raw_cksum(const void *buf, size_t len, uint32_t sum)
170 /* workaround gcc strict-aliasing warning */
171 uintptr_t ptr = (uintptr_t)buf;
172 typedef uint16_t __attribute__((__may_alias__)) u16_p;
173 const u16_p *u16 = (const u16_p *)ptr;
175 while (len >= (sizeof(*u16) * 4)) {
180 len -= sizeof(*u16) * 4;
183 while (len >= sizeof(*u16)) {
189 /* if length is in odd bytes */
191 sum += *((const uint8_t *)u16);
197 * @internal Reduce a sum to the non-complemented checksum.
198 * Helper routine for the rte_raw_cksum().
203 * The non-complemented checksum.
205 static inline uint16_t
206 __rte_raw_cksum_reduce(uint32_t sum)
208 sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
209 sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
210 return (uint16_t)sum;
214 * Process the non-complemented checksum of a buffer.
217 * Pointer to the buffer.
219 * Length of the buffer.
221 * The non-complemented checksum.
223 static inline uint16_t
224 rte_raw_cksum(const void *buf, size_t len)
228 sum = __rte_raw_cksum(buf, len, 0);
229 return __rte_raw_cksum_reduce(sum);
233 * Process the IPv4 checksum of an IPv4 header.
235 * The checksum field must be set to 0 by the caller.
238 * The pointer to the contiguous IPv4 header.
240 * The complemented checksum to set in the IP packet.
242 static inline uint16_t
243 rte_ipv4_cksum(const struct ipv4_hdr *ipv4_hdr)
246 cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct ipv4_hdr));
247 return (cksum == 0xffff) ? cksum : ~cksum;
251 * Process the pseudo-header checksum of an IPv4 header.
253 * The checksum field must be set to 0 by the caller.
255 * Depending on the ol_flags, the pseudo-header checksum expected by the
256 * drivers is not the same. For instance, when TSO is enabled, the IP
257 * payload length must not be included in the packet.
259 * When ol_flags is 0, it computes the standard pseudo-header checksum.
262 * The pointer to the contiguous IPv4 header.
264 * The ol_flags of the associated mbuf.
266 * The non-complemented checksum to set in the L4 header.
268 static inline uint16_t
269 rte_ipv4_phdr_cksum(const struct ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
271 struct ipv4_psd_header {
272 uint32_t src_addr; /* IP address of source host. */
273 uint32_t dst_addr; /* IP address of destination host. */
274 uint8_t zero; /* zero. */
275 uint8_t proto; /* L4 protocol type. */
276 uint16_t len; /* L4 length. */
279 psd_hdr.src_addr = ipv4_hdr->src_addr;
280 psd_hdr.dst_addr = ipv4_hdr->dst_addr;
282 psd_hdr.proto = ipv4_hdr->next_proto_id;
283 if (ol_flags & PKT_TX_TCP_SEG) {
286 psd_hdr.len = rte_cpu_to_be_16(
287 (uint16_t)(rte_be_to_cpu_16(ipv4_hdr->total_length)
288 - sizeof(struct ipv4_hdr)));
290 return rte_raw_cksum(&psd_hdr, sizeof(psd_hdr));
294 * Process the IPv4 UDP or TCP checksum.
296 * The IPv4 header should not contains options. The IP and layer 4
297 * checksum must be set to 0 in the packet by the caller.
300 * The pointer to the contiguous IPv4 header.
302 * The pointer to the beginning of the L4 header.
304 * The complemented checksum to set in the IP packet.
306 static inline uint16_t
307 rte_ipv4_udptcp_cksum(const struct ipv4_hdr *ipv4_hdr, const void *l4_hdr)
312 l4_len = rte_be_to_cpu_16(ipv4_hdr->total_length) -
313 sizeof(struct ipv4_hdr);
315 cksum = rte_raw_cksum(l4_hdr, l4_len);
316 cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0);
318 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
319 cksum = (~cksum) & 0xffff;
330 uint32_t vtc_flow; /**< IP version, traffic class & flow label. */
331 uint16_t payload_len; /**< IP packet length - includes sizeof(ip_header). */
332 uint8_t proto; /**< Protocol, next header. */
333 uint8_t hop_limits; /**< Hop limits. */
334 uint8_t src_addr[16]; /**< IP address of source host. */
335 uint8_t dst_addr[16]; /**< IP address of destination host(s). */
336 } __attribute__((__packed__));
339 * Process the pseudo-header checksum of an IPv6 header.
341 * Depending on the ol_flags, the pseudo-header checksum expected by the
342 * drivers is not the same. For instance, when TSO is enabled, the IPv6
343 * payload length must not be included in the packet.
345 * When ol_flags is 0, it computes the standard pseudo-header checksum.
348 * The pointer to the contiguous IPv6 header.
350 * The ol_flags of the associated mbuf.
352 * The non-complemented checksum to set in the L4 header.
354 static inline uint16_t
355 rte_ipv6_phdr_cksum(const struct ipv6_hdr *ipv6_hdr, uint64_t ol_flags)
359 uint32_t len; /* L4 length. */
360 uint32_t proto; /* L4 protocol - top 3 bytes must be zero */
363 psd_hdr.proto = (ipv6_hdr->proto << 24);
364 if (ol_flags & PKT_TX_TCP_SEG) {
367 psd_hdr.len = ipv6_hdr->payload_len;
370 sum = __rte_raw_cksum(ipv6_hdr->src_addr,
371 sizeof(ipv6_hdr->src_addr) + sizeof(ipv6_hdr->dst_addr),
373 sum = __rte_raw_cksum(&psd_hdr, sizeof(psd_hdr), sum);
374 return __rte_raw_cksum_reduce(sum);
378 * Process the IPv6 UDP or TCP checksum.
380 * The IPv4 header should not contains options. The layer 4 checksum
381 * must be set to 0 in the packet by the caller.
384 * The pointer to the contiguous IPv6 header.
386 * The pointer to the beginning of the L4 header.
388 * The complemented checksum to set in the IP packet.
390 static inline uint16_t
391 rte_ipv6_udptcp_cksum(const struct ipv6_hdr *ipv6_hdr, const void *l4_hdr)
396 l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len);
398 cksum = rte_raw_cksum(l4_hdr, l4_len);
399 cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0);
401 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
402 cksum = (~cksum) & 0xffff;
413 #endif /* _RTE_IP_H_ */