Ben Pfaff
160 lines
4.3 KiB
C
160 lines
4.3 KiB
C
#ifndef PACKETS_H
|
|
#define PACKETS_H 1
|
|
|
|
#include <stdint.h>
|
|
#include "util.h"
|
|
|
|
#define ETH_ADDR_LEN 6
|
|
|
|
static inline bool eth_addr_is_broadcast(const uint8_t ea[6])
|
|
{
|
|
return (ea[0] & ea[1] & ea[2] & ea[3] & ea[4] & ea[5]) == 0xff;
|
|
}
|
|
static inline bool eth_addr_is_multicast(const uint8_t ea[6])
|
|
{
|
|
return ea[0] & 1;
|
|
}
|
|
static inline bool eth_addr_is_local(const uint8_t ea[6])
|
|
{
|
|
return ea[0] & 2;
|
|
}
|
|
|
|
#define ETH_TYPE_IP 0x0800
|
|
#define ETH_TYPE_ARP 0x0806
|
|
#define ETH_TYPE_VLAN 0x8100
|
|
|
|
#define ETH_HEADER_LEN 14
|
|
#define ETH_PAYLOAD_MIN 46
|
|
#define ETH_TOTAL_MIN (ETH_HEADER_LEN + ETH_PAYLOAD_MIN)
|
|
#define ETH_TOTAL_MAX (ETH_HEADER_LEN + VLAN_HEADER_LEN + 1500)
|
|
struct eth_header {
|
|
uint8_t eth_dst[ETH_ADDR_LEN];
|
|
uint8_t eth_src[ETH_ADDR_LEN];
|
|
uint16_t eth_type;
|
|
};
|
|
BUILD_ASSERT_DECL(ETH_HEADER_LEN == sizeof(struct eth_header));
|
|
|
|
#define LLC_DSAP_SNAP 0xaa
|
|
#define LLC_SSAP_SNAP 0xaa
|
|
#define LLC_CNTL_SNAP 3
|
|
|
|
#define LLC_HEADER_LEN 3
|
|
struct llc_header {
|
|
uint8_t llc_dsap;
|
|
uint8_t llc_ssap;
|
|
uint8_t llc_cntl;
|
|
};
|
|
BUILD_ASSERT_DECL(LLC_HEADER_LEN == sizeof(struct llc_header));
|
|
|
|
#define SNAP_ORG_ETHERNET "\0\0" /* The compiler adds a null byte, so
|
|
sizeof(SNAP_ORG_ETHERNET) == 3. */
|
|
#define SNAP_HEADER_LEN 5
|
|
struct snap_header {
|
|
uint8_t snap_org[3];
|
|
uint16_t snap_type;
|
|
} __attribute__((packed));
|
|
BUILD_ASSERT_DECL(SNAP_HEADER_LEN == sizeof(struct snap_header));
|
|
|
|
#define LLC_SNAP_HEADER_LEN (LLC_HEADER_LEN + SNAP_HEADER_LEN)
|
|
struct llc_snap_header {
|
|
struct llc_header llc;
|
|
struct snap_header snap;
|
|
};
|
|
BUILD_ASSERT_DECL(LLC_SNAP_HEADER_LEN == sizeof(struct llc_snap_header));
|
|
|
|
#define VLAN_VID 0x0fff
|
|
|
|
#define VLAN_HEADER_LEN 4
|
|
struct vlan_header {
|
|
uint16_t vlan_tci; /* Lowest 12 bits are VLAN ID. */
|
|
uint16_t vlan_next_type;
|
|
};
|
|
BUILD_ASSERT_DECL(VLAN_HEADER_LEN == sizeof(struct vlan_header));
|
|
|
|
#define VLAN_ETH_HEADER_LEN (ETH_HEADER_LEN + VLAN_HEADER_LEN)
|
|
struct vlan_eth_header {
|
|
uint8_t veth_dst[ETH_ADDR_LEN];
|
|
uint8_t veth_src[ETH_ADDR_LEN];
|
|
uint16_t veth_type;
|
|
uint16_t veth_tci; /* Lowest 12 bits are VLAN ID. */
|
|
uint16_t veth_next_type;
|
|
};
|
|
BUILD_ASSERT_DECL(VLAN_ETH_HEADER_LEN == sizeof(struct vlan_eth_header));
|
|
|
|
#define IP_VER(ip_ihl_ver) ((ip_ihl_ver) >> 4)
|
|
#define IP_IHL(ip_ihl_ver) ((ip_ihl_ver) & 15)
|
|
|
|
#define IP_TYPE_TCP 6
|
|
#define IP_TYPE_UDP 17
|
|
|
|
#define IP_HEADER_LEN 20
|
|
struct ip_header {
|
|
uint8_t ip_ihl_ver;
|
|
uint8_t ip_tos;
|
|
uint16_t ip_tot_len;
|
|
uint16_t ip_id;
|
|
uint16_t ip_frag_off;
|
|
uint8_t ip_ttl;
|
|
uint8_t ip_proto;
|
|
uint16_t ip_csum;
|
|
uint32_t ip_src;
|
|
uint32_t ip_dst;
|
|
};
|
|
BUILD_ASSERT_DECL(IP_HEADER_LEN == sizeof(struct ip_header));
|
|
|
|
#define UDP_HEADER_LEN 8
|
|
struct udp_header {
|
|
uint16_t udp_src;
|
|
uint16_t udp_dst;
|
|
uint16_t udp_len;
|
|
uint16_t udp_csum;
|
|
};
|
|
BUILD_ASSERT_DECL(UDP_HEADER_LEN == sizeof(struct udp_header));
|
|
|
|
#define TCP_FIN 0x01
|
|
#define TCP_SYN 0x02
|
|
#define TCP_RST 0x04
|
|
#define TCP_PSH 0x08
|
|
#define TCP_ACK 0x10
|
|
#define TCP_URG 0x20
|
|
|
|
#define TCP_FLAGS(tcp_ctl) (htons(tcp_ctl) & 0x003f)
|
|
#define TCP_OFFSET(tcp_ctl) (htons(tcp_ctl) >> 12)
|
|
|
|
#define TCP_HEADER_LEN 20
|
|
struct tcp_header {
|
|
uint16_t tcp_src;
|
|
uint16_t tcp_dst;
|
|
uint32_t tcp_seq;
|
|
uint32_t tcp_ack;
|
|
uint16_t tcp_ctl;
|
|
uint16_t tcp_winsz;
|
|
uint16_t tcp_csum;
|
|
uint16_t tcp_urg;
|
|
};
|
|
BUILD_ASSERT_DECL(TCP_HEADER_LEN == sizeof(struct tcp_header));
|
|
|
|
#define ARP_HRD_ETHERNET 1
|
|
#define ARP_PRO_IP 0x0800
|
|
#define ARP_OP_REQUEST 1
|
|
#define ARP_OP_REPLY 2
|
|
|
|
#define ARP_ETH_HEADER_LEN 28
|
|
struct arp_eth_header {
|
|
/* Generic members. */
|
|
uint16_t ar_hrd; /* Hardware type. */
|
|
uint16_t ar_pro; /* Protocol type. */
|
|
uint8_t ar_hln; /* Hardware address length. */
|
|
uint8_t ar_pln; /* Protocol address length. */
|
|
uint16_t ar_op; /* Opcode. */
|
|
|
|
/* Ethernet+IPv4 specific members. */
|
|
uint8_t ar_sha[ETH_ADDR_LEN]; /* Sender hardware address. */
|
|
uint32_t ar_spa; /* Sender protocol address. */
|
|
uint8_t ar_tha[ETH_ADDR_LEN]; /* Target hardware address. */
|
|
uint32_t ar_tpa; /* Target protocol address. */
|
|
} __attribute__((packed));
|
|
BUILD_ASSERT_DECL(ARP_ETH_HEADER_LEN == sizeof(struct arp_eth_header));
|
|
|
|
#endif /* packets.h */
|