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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  typedef uint16_t __attribute__((__may_alias__)) u16_p;
173  const u16_p *u16 = (const u16_p *)ptr;
174 
175  while (len >= (sizeof(*u16) * 4)) {
176  sum += u16[0];
177  sum += u16[1];
178  sum += u16[2];
179  sum += u16[3];
180  len -= sizeof(*u16) * 4;
181  u16 += 4;
182  }
183  while (len >= sizeof(*u16)) {
184  sum += *u16;
185  len -= sizeof(*u16);
186  u16 += 1;
187  }
188 
189  /* if length is in odd bytes */
190  if (len == 1)
191  sum += *((const uint8_t *)u16);
192 
193  return sum;
194 }
195 
205 static inline uint16_t
206 __rte_raw_cksum_reduce(uint32_t sum)
207 {
208  sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
209  sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
210  return (uint16_t)sum;
211 }
212 
223 static inline uint16_t
224 rte_raw_cksum(const void *buf, size_t len)
225 {
226  uint32_t sum;
227 
228  sum = __rte_raw_cksum(buf, len, 0);
229  return __rte_raw_cksum_reduce(sum);
230 }
231 
242 static inline uint16_t
243 rte_ipv4_cksum(const struct ipv4_hdr *ipv4_hdr)
244 {
245  uint16_t cksum;
246  cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct ipv4_hdr));
247  return (cksum == 0xffff) ? cksum : ~cksum;
248 }
249 
268 static inline uint16_t
269 rte_ipv4_phdr_cksum(const struct ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
270 {
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. */
277  } psd_hdr;
278 
279  psd_hdr.src_addr = ipv4_hdr->src_addr;
280  psd_hdr.dst_addr = ipv4_hdr->dst_addr;
281  psd_hdr.zero = 0;
282  psd_hdr.proto = ipv4_hdr->next_proto_id;
283  if (ol_flags & PKT_TX_TCP_SEG) {
284  psd_hdr.len = 0;
285  } else {
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)));
289  }
290  return rte_raw_cksum(&psd_hdr, sizeof(psd_hdr));
291 }
292 
306 static inline uint16_t
307 rte_ipv4_udptcp_cksum(const struct ipv4_hdr *ipv4_hdr, const void *l4_hdr)
308 {
309  uint32_t cksum;
310  uint32_t l4_len;
311 
312  l4_len = rte_be_to_cpu_16(ipv4_hdr->total_length) -
313  sizeof(struct ipv4_hdr);
314 
315  cksum = rte_raw_cksum(l4_hdr, l4_len);
316  cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0);
317 
318  cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
319  cksum = (~cksum) & 0xffff;
320  if (cksum == 0)
321  cksum = 0xffff;
322 
323  return cksum;
324 }
325 
329 struct ipv6_hdr {
330  uint32_t vtc_flow;
331  uint16_t payload_len;
332  uint8_t proto;
333  uint8_t hop_limits;
334  uint8_t src_addr[16];
335  uint8_t dst_addr[16];
336 } __attribute__((__packed__));
337 
354 static inline uint16_t
355 rte_ipv6_phdr_cksum(const struct ipv6_hdr *ipv6_hdr, uint64_t ol_flags)
356 {
357  uint32_t sum;
358  struct {
359  uint32_t len; /* L4 length. */
360  uint32_t proto; /* L4 protocol - top 3 bytes must be zero */
361  } psd_hdr;
362 
363  psd_hdr.proto = (ipv6_hdr->proto << 24);
364  if (ol_flags & PKT_TX_TCP_SEG) {
365  psd_hdr.len = 0;
366  } else {
367  psd_hdr.len = ipv6_hdr->payload_len;
368  }
369 
370  sum = __rte_raw_cksum(ipv6_hdr->src_addr,
371  sizeof(ipv6_hdr->src_addr) + sizeof(ipv6_hdr->dst_addr),
372  0);
373  sum = __rte_raw_cksum(&psd_hdr, sizeof(psd_hdr), sum);
374  return __rte_raw_cksum_reduce(sum);
375 }
376 
390 static inline uint16_t
391 rte_ipv6_udptcp_cksum(const struct ipv6_hdr *ipv6_hdr, const void *l4_hdr)
392 {
393  uint32_t cksum;
394  uint32_t l4_len;
395 
396  l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len);
397 
398  cksum = rte_raw_cksum(l4_hdr, l4_len);
399  cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0);
400 
401  cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
402  cksum = (~cksum) & 0xffff;
403  if (cksum == 0)
404  cksum = 0xffff;
405 
406  return cksum;
407 }
408 
409 #ifdef __cplusplus
410 }
411 #endif
412 
413 #endif /* _RTE_IP_H_ */
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