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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 * @internal Calculate a sum of all words in the buffer.
146 * Helper routine for the rte_raw_cksum().
149 * Pointer to the buffer.
151 * Length of the buffer.
153 * Initial value of the sum.
155 * sum += Sum of all words in the buffer.
157 static inline uint32_t
158 __rte_raw_cksum(const void *buf, size_t len, uint32_t sum)
160 /* workaround gcc strict-aliasing warning */
161 uintptr_t ptr = (uintptr_t)buf;
162 const uint16_t *u16 = (const uint16_t *)ptr;
164 while (len >= (sizeof(*u16) * 4)) {
169 len -= sizeof(*u16) * 4;
172 while (len >= sizeof(*u16)) {
178 /* if length is in odd bytes */
180 sum += *((const uint8_t *)u16);
186 * @internal Reduce a sum to the non-complemented checksum.
187 * Helper routine for the rte_raw_cksum().
192 * The non-complemented checksum.
194 static inline uint16_t
195 __rte_raw_cksum_reduce(uint32_t sum)
197 sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
198 sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
199 return (uint16_t)sum;
203 * Process the non-complemented checksum of a buffer.
206 * Pointer to the buffer.
208 * Length of the buffer.
210 * The non-complemented checksum.
212 static inline uint16_t
213 rte_raw_cksum(const void *buf, size_t len)
217 sum = __rte_raw_cksum(buf, len, 0);
218 return __rte_raw_cksum_reduce(sum);
222 * Process the IPv4 checksum of an IPv4 header.
224 * The checksum field must be set to 0 by the caller.
227 * The pointer to the contiguous IPv4 header.
229 * The complemented checksum to set in the IP packet.
231 static inline uint16_t
232 rte_ipv4_cksum(const struct ipv4_hdr *ipv4_hdr)
235 cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct ipv4_hdr));
236 return ((cksum == 0xffff) ? cksum : ~cksum);
240 * Process the pseudo-header checksum of an IPv4 header.
242 * The checksum field must be set to 0 by the caller.
244 * Depending on the ol_flags, the pseudo-header checksum expected by the
245 * drivers is not the same. For instance, when TSO is enabled, the IP
246 * payload length must not be included in the packet.
248 * When ol_flags is 0, it computes the standard pseudo-header checksum.
251 * The pointer to the contiguous IPv4 header.
253 * The ol_flags of the associated mbuf.
255 * The non-complemented checksum to set in the L4 header.
257 static inline uint16_t
258 rte_ipv4_phdr_cksum(const struct ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
260 struct ipv4_psd_header {
261 uint32_t src_addr; /* IP address of source host. */
262 uint32_t dst_addr; /* IP address of destination host. */
263 uint8_t zero; /* zero. */
264 uint8_t proto; /* L4 protocol type. */
265 uint16_t len; /* L4 length. */
268 psd_hdr.src_addr = ipv4_hdr->src_addr;
269 psd_hdr.dst_addr = ipv4_hdr->dst_addr;
271 psd_hdr.proto = ipv4_hdr->next_proto_id;
272 if (ol_flags & PKT_TX_TCP_SEG) {
275 psd_hdr.len = rte_cpu_to_be_16(
276 (uint16_t)(rte_be_to_cpu_16(ipv4_hdr->total_length)
277 - sizeof(struct ipv4_hdr)));
279 return rte_raw_cksum(&psd_hdr, sizeof(psd_hdr));
283 * Process the IPv4 UDP or TCP checksum.
285 * The IPv4 header should not contains options. The IP and layer 4
286 * checksum must be set to 0 in the packet by the caller.
289 * The pointer to the contiguous IPv4 header.
291 * The pointer to the beginning of the L4 header.
293 * The complemented checksum to set in the IP packet.
295 static inline uint16_t
296 rte_ipv4_udptcp_cksum(const struct ipv4_hdr *ipv4_hdr, const void *l4_hdr)
301 l4_len = rte_be_to_cpu_16(ipv4_hdr->total_length) -
302 sizeof(struct ipv4_hdr);
304 cksum = rte_raw_cksum(l4_hdr, l4_len);
305 cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0);
307 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
308 cksum = (~cksum) & 0xffff;
319 uint32_t vtc_flow; /**< IP version, traffic class & flow label. */
320 uint16_t payload_len; /**< IP packet length - includes sizeof(ip_header). */
321 uint8_t proto; /**< Protocol, next header. */
322 uint8_t hop_limits; /**< Hop limits. */
323 uint8_t src_addr[16]; /**< IP address of source host. */
324 uint8_t dst_addr[16]; /**< IP address of destination host(s). */
325 } __attribute__((__packed__));
328 * Process the pseudo-header checksum of an IPv6 header.
330 * Depending on the ol_flags, the pseudo-header checksum expected by the
331 * drivers is not the same. For instance, when TSO is enabled, the IPv6
332 * payload length must not be included in the packet.
334 * When ol_flags is 0, it computes the standard pseudo-header checksum.
337 * The pointer to the contiguous IPv6 header.
339 * The ol_flags of the associated mbuf.
341 * The non-complemented checksum to set in the L4 header.
343 static inline uint16_t
344 rte_ipv6_phdr_cksum(const struct ipv6_hdr *ipv6_hdr, uint64_t ol_flags)
348 uint32_t len; /* L4 length. */
349 uint32_t proto; /* L4 protocol - top 3 bytes must be zero */
352 psd_hdr.proto = (ipv6_hdr->proto << 24);
353 if (ol_flags & PKT_TX_TCP_SEG) {
356 psd_hdr.len = ipv6_hdr->payload_len;
359 sum = __rte_raw_cksum(ipv6_hdr->src_addr,
360 sizeof(ipv6_hdr->src_addr) + sizeof(ipv6_hdr->dst_addr),
362 sum = __rte_raw_cksum(&psd_hdr, sizeof(psd_hdr), sum);
363 return __rte_raw_cksum_reduce(sum);
367 * Process the IPv6 UDP or TCP checksum.
369 * The IPv4 header should not contains options. The layer 4 checksum
370 * must be set to 0 in the packet by the caller.
373 * The pointer to the contiguous IPv6 header.
375 * The pointer to the beginning of the L4 header.
377 * The complemented checksum to set in the IP packet.
379 static inline uint16_t
380 rte_ipv6_udptcp_cksum(const struct ipv6_hdr *ipv6_hdr, const void *l4_hdr)
385 l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len);
387 cksum = rte_raw_cksum(l4_hdr, l4_len);
388 cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0);
390 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
391 cksum = (~cksum) & 0xffff;
402 #endif /* _RTE_IP_H_ */