diff options
Diffstat (limited to 'include/proto.h')
| -rw-r--r-- | include/proto.h | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/include/proto.h b/include/proto.h new file mode 100644 index 00000000..037ef09e --- /dev/null +++ b/include/proto.h @@ -0,0 +1,287 @@ +#ifndef NFTABLES_PROTO_H +#define NFTABLES_PROTO_H + +#include <nftables.h> + +/** + * enum proto_bases - protocol bases + * + * @PROTO_BASE_INVALID: uninitialised, does not happen + * @PROTO_BASE_LL_HDR: link layer header + * @PROTO_BASE_NETWORK_HDR: network layer header + * @PROTO_BASE_TRANSPORT_HDR: transport layer header + */ +enum proto_bases { + PROTO_BASE_INVALID, + PROTO_BASE_LL_HDR, + PROTO_BASE_NETWORK_HDR, + PROTO_BASE_TRANSPORT_HDR, + __PROTO_BASE_MAX +}; +#define PROTO_BASE_MAX (__PROTO_BASE_MAX - 1) + +extern const char *proto_base_names[]; +extern const char *proto_base_tokens[]; + +/** + * struct proto_hdr_template - protocol header field description + * + * @token: parser token describing the header field + * @dtype: data type of the header field + * @offset: offset of the header field from base + * @len: length of header field + */ +struct proto_hdr_template { + const char *token; + const struct datatype *dtype; + uint16_t offset; + uint16_t len; +}; + +#define PROTO_HDR_TEMPLATE(__token, __dtype, __offset, __len) \ + { \ + .token = (__token), \ + .dtype = (__dtype), \ + .offset = (__offset), \ + .len = (__len), \ + } + +#define PROTO_UPPER_MAX 16 +#define PROTO_HDRS_MAX 20 + +/** + * struct proto_desc - protocol header description + * + * @name: protocol name + * @base: header base + * @protocol_key: key of template containing upper layer protocol description + * @protocols: link to upper layer protocol descriptions indexed by protocol value + * @templates: header templates + */ +struct proto_desc { + const char *name; + enum proto_bases base; + unsigned int protocol_key; + struct { + unsigned int num; + const struct proto_desc *desc; + } protocols[PROTO_UPPER_MAX]; + struct proto_hdr_template templates[PROTO_HDRS_MAX]; +}; + +#define PROTO_LINK(__num, __desc) { .num = (__num), .desc = (__desc), } + +/** + * struct hook_proto_desc - description of protocol constraints imposed by hook family + * + * @base: protocol base of packets + * @desc: protocol description of packets + */ +struct hook_proto_desc { + enum proto_bases base; + const struct proto_desc *desc; +}; + +#define HOOK_PROTO_DESC(__base, __desc) { .base = (__base), .desc = (__desc), } + +extern const struct hook_proto_desc hook_proto_desc[]; + +/** + * struct dev_proto_desc - description of device LL protocol + * + * @desc: protocol description + * @type: arphrd value + */ +struct dev_proto_desc { + const struct proto_desc *desc; + uint16_t type; +}; + +#define DEV_PROTO_DESC(__type, __desc) { .type = (__type), .desc = (__desc), } + +extern int proto_dev_type(const struct proto_desc *desc, uint16_t *res); +extern const struct proto_desc *proto_dev_desc(uint16_t type); + +/** + * struct proto_ctx - protocol context + * + * @family: hook family + * @location: location of the relational expression defining the context + * @desc: protocol description for this layer + * + * The location of the context is the location of the relational expression + * defining it, either directly through a protocol match or indirectly + * through a dependency. + */ +struct proto_ctx { + unsigned int family; + struct { + struct location location; + const struct proto_desc *desc; + } protocol[PROTO_BASE_MAX + 1]; +}; + +extern void proto_ctx_init(struct proto_ctx *ctx, unsigned int family); +extern const struct proto_desc *proto_find_upper(const struct proto_desc *base, + unsigned int num); +extern int proto_find_num(const struct proto_desc *base, + const struct proto_desc *desc); + +enum eth_hdr_fields { + ETHHDR_INVALID, + ETHHDR_DADDR, + ETHHDR_SADDR, + ETHHDR_TYPE, +}; + +enum vlan_hdr_fields { + VLANHDR_INVALID, + VLANHDR_VID, + VLANHDR_CFI, + VLANHDR_PCP, + VLANHDR_TYPE, +}; + +enum arp_hdr_fields { + ARPHDR_INVALID, + ARPHDR_HRD, + ARPHDR_PRO, + ARPHDR_HLN, + ARPHDR_PLN, + ARPHDR_OP, +}; + +enum ip_hdr_fields { + IPHDR_INVALID, + IPHDR_VERSION, + IPHDR_HDRLENGTH, + IPHDR_TOS, + IPHDR_LENGTH, + IPHDR_ID, + IPHDR_FRAG_OFF, + IPHDR_TTL, + IPHDR_PROTOCOL, + IPHDR_CHECKSUM, + IPHDR_SADDR, + IPHDR_DADDR, +}; + +enum icmp_hdr_fields { + ICMPHDR_INVALID, + ICMPHDR_TYPE, + ICMPHDR_CODE, + ICMPHDR_CHECKSUM, + ICMPHDR_ID, + ICMPHDR_SEQ, + ICMPHDR_GATEWAY, + ICMPHDR_MTU, +}; + +enum icmp6_hdr_fields { + ICMP6HDR_INVALID, + ICMP6HDR_TYPE, + ICMP6HDR_CODE, + ICMP6HDR_CHECKSUM, + ICMP6HDR_PPTR, + ICMP6HDR_MTU, + ICMP6HDR_ID, + ICMP6HDR_SEQ, + ICMP6HDR_MAXDELAY, +}; + +enum ip6_hdr_fields { + IP6HDR_INVALID, + IP6HDR_VERSION, + IP6HDR_PRIORITY, + IP6HDR_FLOWLABEL, + IP6HDR_LENGTH, + IP6HDR_NEXTHDR, + IP6HDR_HOPLIMIT, + IP6HDR_SADDR, + IP6HDR_DADDR, + IP6HDR_PROTOCOL, +}; + +enum ah_hdr_fields { + AHHDR_INVALID, + AHHDR_NEXTHDR, + AHHDR_HDRLENGTH, + AHHDR_RESERVED, + AHHDR_SPI, + AHHDR_SEQUENCE, +}; + +enum esp_hdr_fields { + ESPHDR_INVALID, + ESPHDR_SPI, + ESPHDR_SEQUENCE, +}; + +enum comp_hdr_fields { + COMPHDR_INVALID, + COMPHDR_NEXTHDR, + COMPHDR_FLAGS, + COMPHDR_CPI, +}; + +enum udp_hdr_fields { + UDPHDR_INVALID, + UDPHDR_SPORT, + UDPHDR_DPORT, + UDPHDR_LENGTH, + UDPHDR_CSUMCOV = UDPHDR_LENGTH, + UDPHDR_CHECKSUM, +}; + +enum tcp_hdr_fields { + TCPHDR_INVALID, + TCPHDR_SPORT, + TCPHDR_DPORT, + TCPHDR_SEQ, + TCPHDR_ACKSEQ, + TCPHDR_DOFF, + TCPHDR_RESERVED, + TCPHDR_FLAGS, + TCPHDR_WINDOW, + TCPHDR_CHECKSUM, + TCPHDR_URGPTR, +}; + +enum dccp_hdr_fields { + DCCPHDR_INVALID, + DCCPHDR_SPORT, + DCCPHDR_DPORT, + DCCPHDR_TYPE, +}; + +enum sctp_hdr_fields { + SCTPHDR_INVALID, + SCTPHDR_SPORT, + SCTPHDR_DPORT, + SCTPHDR_VTAG, + SCTPHDR_CHECKSUM, +}; + +extern const struct proto_desc proto_icmp; +extern const struct proto_desc proto_ah; +extern const struct proto_desc proto_esp; +extern const struct proto_desc proto_comp; +extern const struct proto_desc proto_udp; +extern const struct proto_desc proto_udplite; +extern const struct proto_desc proto_tcp; +extern const struct proto_desc proto_dccp; +extern const struct proto_desc proto_sctp; +extern const struct proto_desc proto_icmp6; + +extern const struct proto_desc proto_ip; +extern const struct proto_desc proto_ip6; + +extern const struct proto_desc proto_arp; + +extern const struct proto_desc proto_vlan; +extern const struct proto_desc proto_eth; + +extern const struct proto_desc proto_unknown; +extern const struct proto_hdr_template proto_unknown_template; + +#endif /* NFTABLES_PROTO_H */ |