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rte_ip.h
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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 $
69  */
70 
71 #ifndef _RTE_IP_H_
72 #define _RTE_IP_H_
73 
80 #include <stdint.h>
81 #include <netinet/in.h>
82 
83 #include <rte_byteorder.h>
84 #include <rte_mbuf.h>
85 
86 #ifdef __cplusplus
87 extern "C" {
88 #endif
89 
93 struct ipv4_hdr {
94  uint8_t version_ihl;
95  uint8_t type_of_service;
96  uint16_t total_length;
97  uint16_t packet_id;
98  uint16_t fragment_offset;
99  uint8_t time_to_live;
100  uint8_t next_proto_id;
101  uint16_t hdr_checksum;
102  uint32_t src_addr;
103  uint32_t dst_addr;
104 } __attribute__((__packed__));
105 
107 #define IPv4(a,b,c,d) ((uint32_t)(((a) & 0xff) << 24) | \
108  (((b) & 0xff) << 16) | \
109  (((c) & 0xff) << 8) | \
110  ((d) & 0xff))
111 
113 #define IPV4_MAX_PKT_LEN 65535
114 
116 #define IPV4_HDR_IHL_MASK (0x0f)
117 
121 #define IPV4_IHL_MULTIPLIER (4)
122 
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
127 
128 #define IPV4_HDR_DF_FLAG (1 << IPV4_HDR_DF_SHIFT)
129 #define IPV4_HDR_MF_FLAG (1 << IPV4_HDR_MF_SHIFT)
130 
131 #define IPV4_HDR_OFFSET_MASK ((1 << IPV4_HDR_MF_SHIFT) - 1)
132 
133 #define IPV4_HDR_OFFSET_UNITS 8
134 
135 /*
136  * IPv4 address types
137  */
138 #define IPV4_ANY ((uint32_t)0x00000000)
139 #define IPV4_LOOPBACK ((uint32_t)0x7f000001)
140 #define IPV4_BROADCAST ((uint32_t)0xe0000000)
141 #define IPV4_ALLHOSTS_GROUP ((uint32_t)0xe0000001)
142 #define IPV4_ALLRTRS_GROUP ((uint32_t)0xe0000002)
143 #define IPV4_MAX_LOCAL_GROUP ((uint32_t)0xe00000ff)
145 /*
146  * IPv4 Multicast-related macros
147  */
148 #define IPV4_MIN_MCAST IPv4(224, 0, 0, 0)
149 #define IPV4_MAX_MCAST IPv4(239, 255, 255, 255)
151 #define IS_IPV4_MCAST(x) \
152  ((x) >= IPV4_MIN_MCAST && (x) <= IPV4_MAX_MCAST)
167 static inline uint32_t
168 __rte_raw_cksum(const void *buf, size_t len, uint32_t sum)
169 {
170  /* workaround gcc strict-aliasing warning */
171  uintptr_t ptr = (uintptr_t)buf;
172  const uint16_t *u16 = (const uint16_t *)ptr;
173 
174  while (len >= (sizeof(*u16) * 4)) {
175  sum += u16[0];
176  sum += u16[1];
177  sum += u16[2];
178  sum += u16[3];
179  len -= sizeof(*u16) * 4;
180  u16 += 4;
181  }
182  while (len >= sizeof(*u16)) {
183  sum += *u16;
184  len -= sizeof(*u16);
185  u16 += 1;
186  }
187 
188  /* if length is in odd bytes */
189  if (len == 1)
190  sum += *((const uint8_t *)u16);
191 
192  return sum;
193 }
194 
204 static inline uint16_t
205 __rte_raw_cksum_reduce(uint32_t sum)
206 {
207  sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
208  sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
209  return (uint16_t)sum;
210 }
211 
222 static inline uint16_t
223 rte_raw_cksum(const void *buf, size_t len)
224 {
225  uint32_t sum;
226 
227  sum = __rte_raw_cksum(buf, len, 0);
228  return __rte_raw_cksum_reduce(sum);
229 }
230 
241 static inline uint16_t
242 rte_ipv4_cksum(const struct ipv4_hdr *ipv4_hdr)
243 {
244  uint16_t cksum;
245  cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct ipv4_hdr));
246  return (cksum == 0xffff) ? cksum : ~cksum;
247 }
248 
267 static inline uint16_t
268 rte_ipv4_phdr_cksum(const struct ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
269 {
270  struct ipv4_psd_header {
271  uint32_t src_addr; /* IP address of source host. */
272  uint32_t dst_addr; /* IP address of destination host. */
273  uint8_t zero; /* zero. */
274  uint8_t proto; /* L4 protocol type. */
275  uint16_t len; /* L4 length. */
276  } psd_hdr;
277 
278  psd_hdr.src_addr = ipv4_hdr->src_addr;
279  psd_hdr.dst_addr = ipv4_hdr->dst_addr;
280  psd_hdr.zero = 0;
281  psd_hdr.proto = ipv4_hdr->next_proto_id;
282  if (ol_flags & PKT_TX_TCP_SEG) {
283  psd_hdr.len = 0;
284  } else {
285  psd_hdr.len = rte_cpu_to_be_16(
286  (uint16_t)(rte_be_to_cpu_16(ipv4_hdr->total_length)
287  - sizeof(struct ipv4_hdr)));
288  }
289  return rte_raw_cksum(&psd_hdr, sizeof(psd_hdr));
290 }
291 
305 static inline uint16_t
306 rte_ipv4_udptcp_cksum(const struct ipv4_hdr *ipv4_hdr, const void *l4_hdr)
307 {
308  uint32_t cksum;
309  uint32_t l4_len;
310 
311  l4_len = rte_be_to_cpu_16(ipv4_hdr->total_length) -
312  sizeof(struct ipv4_hdr);
313 
314  cksum = rte_raw_cksum(l4_hdr, l4_len);
315  cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0);
316 
317  cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
318  cksum = (~cksum) & 0xffff;
319  if (cksum == 0)
320  cksum = 0xffff;
321 
322  return cksum;
323 }
324 
328 struct ipv6_hdr {
329  uint32_t vtc_flow;
330  uint16_t payload_len;
331  uint8_t proto;
332  uint8_t hop_limits;
333  uint8_t src_addr[16];
334  uint8_t dst_addr[16];
335 } __attribute__((__packed__));
336 
353 static inline uint16_t
354 rte_ipv6_phdr_cksum(const struct ipv6_hdr *ipv6_hdr, uint64_t ol_flags)
355 {
356  uint32_t sum;
357  struct {
358  uint32_t len; /* L4 length. */
359  uint32_t proto; /* L4 protocol - top 3 bytes must be zero */
360  } psd_hdr;
361 
362  psd_hdr.proto = (ipv6_hdr->proto << 24);
363  if (ol_flags & PKT_TX_TCP_SEG) {
364  psd_hdr.len = 0;
365  } else {
366  psd_hdr.len = ipv6_hdr->payload_len;
367  }
368 
369  sum = __rte_raw_cksum(ipv6_hdr->src_addr,
370  sizeof(ipv6_hdr->src_addr) + sizeof(ipv6_hdr->dst_addr),
371  0);
372  sum = __rte_raw_cksum(&psd_hdr, sizeof(psd_hdr), sum);
373  return __rte_raw_cksum_reduce(sum);
374 }
375 
389 static inline uint16_t
390 rte_ipv6_udptcp_cksum(const struct ipv6_hdr *ipv6_hdr, const void *l4_hdr)
391 {
392  uint32_t cksum;
393  uint32_t l4_len;
394 
395  l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len);
396 
397  cksum = rte_raw_cksum(l4_hdr, l4_len);
398  cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0);
399 
400  cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
401  cksum = (~cksum) & 0xffff;
402  if (cksum == 0)
403  cksum = 0xffff;
404 
405  return cksum;
406 }
407 
408 #ifdef __cplusplus
409 }
410 #endif
411 
412 #endif /* _RTE_IP_H_ */
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