if_packet.h 8.0 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2. #ifndef __LINUX_IF_PACKET_H
  3. #define __LINUX_IF_PACKET_H
  4. #include <asm/byteorder.h>
  5. #include <linux/types.h>
  6. struct sockaddr_pkt {
  7. unsigned short spkt_family;
  8. unsigned char spkt_device[14];
  9. __be16 spkt_protocol;
  10. };
  11. struct sockaddr_ll {
  12. unsigned short sll_family;
  13. __be16 sll_protocol;
  14. int sll_ifindex;
  15. unsigned short sll_hatype;
  16. unsigned char sll_pkttype;
  17. unsigned char sll_halen;
  18. unsigned char sll_addr[8];
  19. };
  20. /* Packet types */
  21. #define PACKET_HOST 0 /* To us */
  22. #define PACKET_BROADCAST 1 /* To all */
  23. #define PACKET_MULTICAST 2 /* To group */
  24. #define PACKET_OTHERHOST 3 /* To someone else */
  25. #define PACKET_OUTGOING 4 /* Outgoing of any type */
  26. #define PACKET_LOOPBACK 5 /* MC/BRD frame looped back */
  27. #define PACKET_USER 6 /* To user space */
  28. #define PACKET_KERNEL 7 /* To kernel space */
  29. /* Unused, PACKET_FASTROUTE and PACKET_LOOPBACK are invisible to user space */
  30. #define PACKET_FASTROUTE 6 /* Fastrouted frame */
  31. /* Packet socket options */
  32. #define PACKET_ADD_MEMBERSHIP 1
  33. #define PACKET_DROP_MEMBERSHIP 2
  34. #define PACKET_RECV_OUTPUT 3
  35. /* Value 4 is still used by obsolete turbo-packet. */
  36. #define PACKET_RX_RING 5
  37. #define PACKET_STATISTICS 6
  38. #define PACKET_COPY_THRESH 7
  39. #define PACKET_AUXDATA 8
  40. #define PACKET_ORIGDEV 9
  41. #define PACKET_VERSION 10
  42. #define PACKET_HDRLEN 11
  43. #define PACKET_RESERVE 12
  44. #define PACKET_TX_RING 13
  45. #define PACKET_LOSS 14
  46. #define PACKET_VNET_HDR 15
  47. #define PACKET_TX_TIMESTAMP 16
  48. #define PACKET_TIMESTAMP 17
  49. #define PACKET_FANOUT 18
  50. #define PACKET_TX_HAS_OFF 19
  51. #define PACKET_QDISC_BYPASS 20
  52. #define PACKET_ROLLOVER_STATS 21
  53. #define PACKET_FANOUT_DATA 22
  54. #define PACKET_IGNORE_OUTGOING 23
  55. #define PACKET_FANOUT_HASH 0
  56. #define PACKET_FANOUT_LB 1
  57. #define PACKET_FANOUT_CPU 2
  58. #define PACKET_FANOUT_ROLLOVER 3
  59. #define PACKET_FANOUT_RND 4
  60. #define PACKET_FANOUT_QM 5
  61. #define PACKET_FANOUT_CBPF 6
  62. #define PACKET_FANOUT_EBPF 7
  63. #define PACKET_FANOUT_FLAG_ROLLOVER 0x1000
  64. #define PACKET_FANOUT_FLAG_UNIQUEID 0x2000
  65. #define PACKET_FANOUT_FLAG_DEFRAG 0x8000
  66. struct tpacket_stats {
  67. unsigned int tp_packets;
  68. unsigned int tp_drops;
  69. };
  70. struct tpacket_stats_v3 {
  71. unsigned int tp_packets;
  72. unsigned int tp_drops;
  73. unsigned int tp_freeze_q_cnt;
  74. };
  75. struct tpacket_rollover_stats {
  76. __aligned_u64 tp_all;
  77. __aligned_u64 tp_huge;
  78. __aligned_u64 tp_failed;
  79. };
  80. union tpacket_stats_u {
  81. struct tpacket_stats stats1;
  82. struct tpacket_stats_v3 stats3;
  83. };
  84. struct tpacket_auxdata {
  85. __u32 tp_status;
  86. __u32 tp_len;
  87. __u32 tp_snaplen;
  88. __u16 tp_mac;
  89. __u16 tp_net;
  90. __u16 tp_vlan_tci;
  91. __u16 tp_vlan_tpid;
  92. };
  93. /* Rx ring - header status */
  94. #define TP_STATUS_KERNEL 0
  95. #define TP_STATUS_USER (1 << 0)
  96. #define TP_STATUS_COPY (1 << 1)
  97. #define TP_STATUS_LOSING (1 << 2)
  98. #define TP_STATUS_CSUMNOTREADY (1 << 3)
  99. #define TP_STATUS_VLAN_VALID (1 << 4) /* auxdata has valid tp_vlan_tci */
  100. #define TP_STATUS_BLK_TMO (1 << 5)
  101. #define TP_STATUS_VLAN_TPID_VALID (1 << 6) /* auxdata has valid tp_vlan_tpid */
  102. #define TP_STATUS_CSUM_VALID (1 << 7)
  103. /* Tx ring - header status */
  104. #define TP_STATUS_AVAILABLE 0
  105. #define TP_STATUS_SEND_REQUEST (1 << 0)
  106. #define TP_STATUS_SENDING (1 << 1)
  107. #define TP_STATUS_WRONG_FORMAT (1 << 2)
  108. /* Rx and Tx ring - header status */
  109. #define TP_STATUS_TS_SOFTWARE (1 << 29)
  110. #define TP_STATUS_TS_SYS_HARDWARE (1 << 30) /* deprecated, never set */
  111. #define TP_STATUS_TS_RAW_HARDWARE (1U << 31)
  112. /* Rx ring - feature request bits */
  113. #define TP_FT_REQ_FILL_RXHASH 0x1
  114. struct tpacket_hdr {
  115. unsigned long tp_status;
  116. unsigned int tp_len;
  117. unsigned int tp_snaplen;
  118. unsigned short tp_mac;
  119. unsigned short tp_net;
  120. unsigned int tp_sec;
  121. unsigned int tp_usec;
  122. };
  123. #define TPACKET_ALIGNMENT 16
  124. #define TPACKET_ALIGN(x) (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1))
  125. #define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll))
  126. struct tpacket2_hdr {
  127. __u32 tp_status;
  128. __u32 tp_len;
  129. __u32 tp_snaplen;
  130. __u16 tp_mac;
  131. __u16 tp_net;
  132. __u32 tp_sec;
  133. __u32 tp_nsec;
  134. __u16 tp_vlan_tci;
  135. __u16 tp_vlan_tpid;
  136. __u8 tp_padding[4];
  137. };
  138. struct tpacket_hdr_variant1 {
  139. __u32 tp_rxhash;
  140. __u32 tp_vlan_tci;
  141. __u16 tp_vlan_tpid;
  142. __u16 tp_padding;
  143. };
  144. struct tpacket3_hdr {
  145. __u32 tp_next_offset;
  146. __u32 tp_sec;
  147. __u32 tp_nsec;
  148. __u32 tp_snaplen;
  149. __u32 tp_len;
  150. __u32 tp_status;
  151. __u16 tp_mac;
  152. __u16 tp_net;
  153. /* pkt_hdr variants */
  154. union {
  155. struct tpacket_hdr_variant1 hv1;
  156. };
  157. __u8 tp_padding[8];
  158. };
  159. struct tpacket_bd_ts {
  160. unsigned int ts_sec;
  161. union {
  162. unsigned int ts_usec;
  163. unsigned int ts_nsec;
  164. };
  165. };
  166. struct tpacket_hdr_v1 {
  167. __u32 block_status;
  168. __u32 num_pkts;
  169. __u32 offset_to_first_pkt;
  170. /* Number of valid bytes (including padding)
  171. * blk_len <= tp_block_size
  172. */
  173. __u32 blk_len;
  174. /*
  175. * Quite a few uses of sequence number:
  176. * 1. Make sure cache flush etc worked.
  177. * Well, one can argue - why not use the increasing ts below?
  178. * But look at 2. below first.
  179. * 2. When you pass around blocks to other user space decoders,
  180. * you can see which blk[s] is[are] outstanding etc.
  181. * 3. Validate kernel code.
  182. */
  183. __aligned_u64 seq_num;
  184. /*
  185. * ts_last_pkt:
  186. *
  187. * Case 1. Block has 'N'(N >=1) packets and TMO'd(timed out)
  188. * ts_last_pkt == 'time-stamp of last packet' and NOT the
  189. * time when the timer fired and the block was closed.
  190. * By providing the ts of the last packet we can absolutely
  191. * guarantee that time-stamp wise, the first packet in the
  192. * next block will never precede the last packet of the
  193. * previous block.
  194. * Case 2. Block has zero packets and TMO'd
  195. * ts_last_pkt = time when the timer fired and the block
  196. * was closed.
  197. * Case 3. Block has 'N' packets and NO TMO.
  198. * ts_last_pkt = time-stamp of the last pkt in the block.
  199. *
  200. * ts_first_pkt:
  201. * Is always the time-stamp when the block was opened.
  202. * Case a) ZERO packets
  203. * No packets to deal with but atleast you know the
  204. * time-interval of this block.
  205. * Case b) Non-zero packets
  206. * Use the ts of the first packet in the block.
  207. *
  208. */
  209. struct tpacket_bd_ts ts_first_pkt, ts_last_pkt;
  210. };
  211. union tpacket_bd_header_u {
  212. struct tpacket_hdr_v1 bh1;
  213. };
  214. struct tpacket_block_desc {
  215. __u32 version;
  216. __u32 offset_to_priv;
  217. union tpacket_bd_header_u hdr;
  218. };
  219. #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll))
  220. #define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll))
  221. enum tpacket_versions {
  222. TPACKET_V1,
  223. TPACKET_V2,
  224. TPACKET_V3
  225. };
  226. /*
  227. Frame structure:
  228. - Start. Frame must be aligned to TPACKET_ALIGNMENT=16
  229. - struct tpacket_hdr
  230. - pad to TPACKET_ALIGNMENT=16
  231. - struct sockaddr_ll
  232. - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16
  233. - Start+tp_mac: [ Optional MAC header ]
  234. - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16.
  235. - Pad to align to TPACKET_ALIGNMENT=16
  236. */
  237. struct tpacket_req {
  238. unsigned int tp_block_size; /* Minimal size of contiguous block */
  239. unsigned int tp_block_nr; /* Number of blocks */
  240. unsigned int tp_frame_size; /* Size of frame */
  241. unsigned int tp_frame_nr; /* Total number of frames */
  242. };
  243. struct tpacket_req3 {
  244. unsigned int tp_block_size; /* Minimal size of contiguous block */
  245. unsigned int tp_block_nr; /* Number of blocks */
  246. unsigned int tp_frame_size; /* Size of frame */
  247. unsigned int tp_frame_nr; /* Total number of frames */
  248. unsigned int tp_retire_blk_tov; /* timeout in msecs */
  249. unsigned int tp_sizeof_priv; /* offset to private data area */
  250. unsigned int tp_feature_req_word;
  251. };
  252. union tpacket_req_u {
  253. struct tpacket_req req;
  254. struct tpacket_req3 req3;
  255. };
  256. struct packet_mreq {
  257. int mr_ifindex;
  258. unsigned short mr_type;
  259. unsigned short mr_alen;
  260. unsigned char mr_address[8];
  261. };
  262. struct fanout_args {
  263. #if defined(__LITTLE_ENDIAN_BITFIELD)
  264. __u16 id;
  265. __u16 type_flags;
  266. #else
  267. __u16 type_flags;
  268. __u16 id;
  269. #endif
  270. __u32 max_num_members;
  271. };
  272. #define PACKET_MR_MULTICAST 0
  273. #define PACKET_MR_PROMISC 1
  274. #define PACKET_MR_ALLMULTI 2
  275. #define PACKET_MR_UNICAST 3
  276. #endif