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_MPLS,
  18         PROTO_IP4,
  19         PROTO_ICMP4,
  20         PROTO_IP6,
  21         PROTO_ICMP6,
  22         PROTO_UDP,
  23         PROTO_TCP,
  24 };
  25
  26 enum proto_layer {
  27         PROTO_L0, /* invalid layer */
  28         PROTO_L2,
  29         PROTO_L3,
  30         PROTO_L4,
  31 };
  32
  33 struct proto_field {
  34         uint32_t id;
  35         size_t len;
  36         uint32_t shift;
  37         uint32_t mask;
  38         /* might be negative (e.g. VLAN TPID field) */
  39         int16_t offset;
  40
  41         bool is_set;
  42         uint16_t pkt_offset;
  43 };
  44
  45 struct proto_hdr {
  46         enum proto_id id;
  47         enum proto_layer layer;
  48
  49         struct proto_hdr *next;
  50         struct proto_ctx *ctx;
  51         uint16_t pkt_offset;
  52         struct proto_field *fields;
  53         size_t fields_count;
  54
  55         void (*header_init)(struct proto_hdr *hdr);
  56         void (*header_finish)(struct proto_hdr *hdr);
  57         void (*packet_finish)(struct proto_hdr *hdr);
  58         void (*set_next_proto)(struct proto_hdr *hdr, enum proto_id pid);
  59 };
  60
  61 extern void protos_init(const char *dev);
  62 extern void proto_header_register(struct proto_hdr *hdr);
  63
  64 extern struct proto_hdr *proto_header_init(enum proto_id pid);
  65 extern void proto_header_finish(struct proto_hdr *hdr);
  66 extern void proto_packet_finish(void);
  67 extern struct proto_hdr *proto_lower_default_add(struct proto_hdr *hdr,
  68                                                  enum proto_id pid);
  69
  70 extern struct proto_hdr *proto_lower_header(struct proto_hdr *hdr);
  71 extern uint8_t *proto_header_ptr(struct proto_hdr *hdr);
  72
  73 extern void proto_header_fields_add(struct proto_hdr *hdr,
  74                                     const struct proto_field *fields,
  75                                     size_t count);
  76
  77 extern bool proto_field_is_set(struct proto_hdr *hdr, uint32_t fid);
  78 extern void proto_field_set_bytes(struct proto_hdr *hdr, uint32_t fid,
  79                                   uint8_t *bytes);
  80 extern void proto_field_set_u8(struct proto_hdr *hdr, uint32_t fid, uint8_t val);
  81 extern uint8_t proto_field_get_u8(struct proto_hdr *hdr, uint32_t fid);
  82 extern void proto_field_set_u16(struct proto_hdr *hdr, uint32_t fid, uint16_t val);
  83 extern uint16_t proto_field_get_u16(struct proto_hdr *hdr, uint32_t fid);
  84 extern void proto_field_set_u32(struct proto_hdr *hdr, uint32_t fid, uint32_t val);
  85 extern uint32_t proto_field_get_u32(struct proto_hdr *hdr, uint32_t fid);
  86
  87 extern void proto_field_set_default_bytes(struct proto_hdr *hdr, uint32_t fid,
  88                                           uint8_t *bytes);
  89 extern void proto_field_set_default_u8(struct proto_hdr *hdr, uint32_t fid,
  90                                        uint8_t val);
  91 extern void proto_field_set_default_u16(struct proto_hdr *hdr, uint32_t fid,
  92                                         uint16_t val);
  93 extern void proto_field_set_default_u32(struct proto_hdr *hdr, uint32_t fid,
  94                                         uint32_t val);
  95
  96 extern void proto_field_set_be16(struct proto_hdr *hdr, uint32_t fid, uint16_t val);
  97 extern void proto_field_set_be32(struct proto_hdr *hdr, uint32_t fid, uint32_t val);
  98
  99 extern void proto_field_set_default_be16(struct proto_hdr *hdr, uint32_t fid,
 100                                          uint16_t val);
 101 extern void proto_field_set_default_be32(struct proto_hdr *hdr, uint32_t fid,
 102                                          uint32_t val);
 103
 104 extern void proto_field_set_dev_mac(struct proto_hdr *hdr, uint32_t fid);
 105 extern void proto_field_set_default_dev_mac(struct proto_hdr *hdr, uint32_t fid);
 106
 107 extern void proto_field_set_dev_ipv4(struct proto_hdr *hdr, uint32_t fid);
 108 extern void proto_field_set_default_dev_ipv4(struct proto_hdr *hdr, uint32_t fid);
 109
 110 extern void proto_field_set_dev_ipv6(struct proto_hdr *hdr, uint32_t fid);
 111 extern void proto_field_set_default_dev_ipv6(struct proto_hdr *hdr, uint32_t fid);
 112
 113 #endif /* TRAFGEN_PROTO_H */