trafgen_proto.h

   1 #ifndef TRAFGEN_PROTO_H
   2 #define TRAFGEN_PROTO_H
   3
   4 #include <stddef.h>
   5 #include <stdint.h>
   6 #include <stdbool.h>
   7
   8 struct proto_ctx {
   9         const char *dev;
  10 };
  11
  12 enum proto_id {
  13         PROTO_NONE,
  14         PROTO_ETH,
  15         PROTO_VLAN,
  16         PROTO_ARP,
  17         PROTO_IP4,
  18         PROTO_IP6,
  19         PROTO_UDP,
  20         PROTO_TCP,
  21 };
  22
  23 enum proto_layer {
  24         PROTO_L0, /* invalid layer */
  25         PROTO_L2,
  26         PROTO_L3,
  27         PROTO_L4,
  28 };
  29
  30 struct proto_field {
  31         uint32_t id;
  32         size_t len;
  33         uint32_t shift;
  34         uint32_t mask;
  35         /* might be negative (e.g. VLAN TPID field) */
  36         int16_t offset;
  37
  38         bool is_set;
  39         uint16_t pkt_offset;
  40 };
  41
  42 struct proto_hdr {
  43         enum proto_id id;
  44         enum proto_layer layer;
  45
  46         struct proto_hdr *next;
  47         struct proto_ctx *ctx;
  48         uint16_t pkt_offset;
  49         struct proto_field *fields;
  50         size_t fields_count;
  51
  52         void (*header_init)(struct proto_hdr *hdr);
  53         void (*header_finish)(struct proto_hdr *hdr);
  54         void (*packet_finish)(struct proto_hdr *hdr);
  55         void (*set_next_proto)(struct proto_hdr *hdr, enum proto_id pid);
  56 };
  57
  58 extern void protos_init(const char *dev);
  59 extern void proto_header_register(struct proto_hdr *hdr);
  60
  61 extern struct proto_hdr *proto_header_init(enum proto_id pid);
  62 extern void proto_header_finish(struct proto_hdr *hdr);
  63 extern void proto_packet_finish(void);
  64 extern struct proto_hdr *proto_lower_default_add(struct proto_hdr *hdr,
  65                                                  enum proto_id pid);
  66
  67 extern struct proto_hdr *proto_lower_header(struct proto_hdr *hdr);
  68 extern uint8_t *proto_header_ptr(struct proto_hdr *hdr);
  69
  70 extern void proto_header_fields_add(struct proto_hdr *hdr,
  71                                     const struct proto_field *fields,
  72                                     size_t count);
  73
  74 extern bool proto_field_is_set(struct proto_hdr *hdr, uint32_t fid);
  75 extern void proto_field_set_bytes(struct proto_hdr *hdr, uint32_t fid,
  76                                   uint8_t *bytes);
  77 extern void proto_field_set_u8(struct proto_hdr *hdr, uint32_t fid, uint8_t val);
  78 extern uint8_t proto_field_get_u8(struct proto_hdr *hdr, uint32_t fid);
  79 extern void proto_field_set_u16(struct proto_hdr *hdr, uint32_t fid, uint16_t val);
  80 extern uint16_t proto_field_get_u16(struct proto_hdr *hdr, uint32_t fid);
  81 extern void proto_field_set_u32(struct proto_hdr *hdr, uint32_t fid, uint32_t val);
  82 extern uint32_t proto_field_get_u32(struct proto_hdr *hdr, uint32_t fid);
  83
  84 extern void proto_field_set_default_bytes(struct proto_hdr *hdr, uint32_t fid,
  85                                           uint8_t *bytes);
  86 extern void proto_field_set_default_u8(struct proto_hdr *hdr, uint32_t fid,
  87                                        uint8_t val);
  88 extern void proto_field_set_default_u16(struct proto_hdr *hdr, uint32_t fid,
  89                                         uint16_t val);
  90 extern void proto_field_set_default_u32(struct proto_hdr *hdr, uint32_t fid,
  91                                         uint32_t val);
  92
  93 extern void proto_field_set_be16(struct proto_hdr *hdr, uint32_t fid, uint16_t val);
  94 extern void proto_field_set_be32(struct proto_hdr *hdr, uint32_t fid, uint32_t val);
  95
  96 extern void proto_field_set_default_be16(struct proto_hdr *hdr, uint32_t fid,
  97                                          uint16_t val);
  98 extern void proto_field_set_default_be32(struct proto_hdr *hdr, uint32_t fid,
  99                                          uint32_t val);
 100
 101 extern void proto_field_set_dev_mac(struct proto_hdr *hdr, uint32_t fid);
 102 extern void proto_field_set_default_dev_mac(struct proto_hdr *hdr, uint32_t fid);
 103
 104 extern void proto_field_set_dev_ipv4(struct proto_hdr *hdr, uint32_t fid);
 105 extern void proto_field_set_default_dev_ipv4(struct proto_hdr *hdr, uint32_t fid);
 106
 107 #endif /* TRAFGEN_PROTO_H */