diff options
Diffstat (limited to 'src/openvpn/proto.h')
| -rw-r--r-- | src/openvpn/proto.h | 67 |
1 files changed, 64 insertions, 3 deletions
diff --git a/src/openvpn/proto.h b/src/openvpn/proto.h index 985aa99..c251767 100644 --- a/src/openvpn/proto.h +++ b/src/openvpn/proto.h @@ -60,9 +60,31 @@ struct openvpn_ethhdr #define OPENVPN_ETH_P_IPV4 0x0800 /* IPv4 protocol */ #define OPENVPN_ETH_P_IPV6 0x86DD /* IPv6 protocol */ #define OPENVPN_ETH_P_ARP 0x0806 /* ARP protocol */ +#define OPENVPN_ETH_P_8021Q 0x8100 /* 802.1Q protocol */ uint16_t proto; /* packet type ID field */ }; +struct openvpn_8021qhdr +{ + uint8_t dest[OPENVPN_ETH_ALEN]; /* destination ethernet addr */ + uint8_t source[OPENVPN_ETH_ALEN]; /* source ethernet addr */ + + uint16_t tpid; /* 802.1Q Tag Protocol Identifier */ +#define OPENVPN_8021Q_MASK_PCP htons(0xE000) /* mask PCP out of pcp_cfi_vid */ +#define OPENVPN_8021Q_MASK_CFI htons(0x1000) /* mask CFI out of pcp_cfi_vid */ +#define OPENVPN_8021Q_MASK_VID htons(0x0FFF) /* mask VID out of pcp_cfi_vid */ + uint16_t pcp_cfi_vid; /* bit fields, see IEEE 802.1Q */ + uint16_t proto; /* contained packet type ID field */ +}; + +/* + * Size difference between a regular Ethernet II header and an Ethernet II + * header with additional IEEE 802.1Q tagging. + */ +#define SIZE_ETH_TO_8021Q_HDR (sizeof(struct openvpn_8021qhdr) \ + - sizeof(struct openvpn_ethhdr)) + + struct openvpn_arp { #define ARP_MAC_ADDR_TYPE 0x0001 uint16_t mac_addr_type; /* 0x0001 */ @@ -95,9 +117,10 @@ struct openvpn_iphdr { uint8_t ttl; -#define OPENVPN_IPPROTO_IGMP 2 /* IGMP protocol */ -#define OPENVPN_IPPROTO_TCP 6 /* TCP protocol */ -#define OPENVPN_IPPROTO_UDP 17 /* UDP protocol */ +#define OPENVPN_IPPROTO_IGMP 2 /* IGMP protocol */ +#define OPENVPN_IPPROTO_TCP 6 /* TCP protocol */ +#define OPENVPN_IPPROTO_UDP 17 /* UDP protocol */ +#define OPENVPN_IPPROTO_ICMPV6 58 /* ICMPV6 protocol */ uint8_t protocol; uint16_t check; @@ -120,6 +143,24 @@ struct openvpn_ipv6hdr { struct in6_addr daddr; }; +/* + * ICMPv6 header + */ +struct openvpn_icmp6hdr { +#define OPENVPN_ICMP6_DESTINATION_UNREACHABLE 1 +#define OPENVPN_ND_ROUTER_SOLICIT 133 +#define OPENVPN_ND_ROUTER_ADVERT 134 +#define OPENVPN_ND_NEIGHBOR_SOLICIT 135 +#define OPENVPN_ND_NEIGHBOR_ADVERT 136 +#define OPENVPN_ND_INVERSE_SOLICIT 141 +#define OPENVPN_ND_INVERSE_ADVERT 142 + uint8_t icmp6_type; +#define OPENVPN_ICMP6_DU_NOROUTE 0 +#define OPENVPN_ICMP6_DU_COMMUNICATION_PROHIBTED 1 + uint8_t icmp6_code; + uint16_t icmp6_cksum; + uint8_t icmp6_dataun[4]; +}; /* * UDP header @@ -265,6 +306,23 @@ bool is_ipv4(int tunnel_type, struct buffer *buf); bool is_ipv6(int tunnel_type, struct buffer *buf); +/** + * Calculates an IP or IPv6 checksum with a pseudo header as required by + * TCP, UDP and ICMPv6 + * + * @param af - Address family for which the checksum is calculated + * AF_INET or AF_INET6 + * @param payload - the TCP, ICMPv6 or UDP packet + * @param len_payload - length of payload + * @param src_addr - Source address of the packet + * @param dest_addr - Destination address of the packet + * @param proto next - header or IP protocol of the packet + * @return The calculated checksum in host order + */ +uint16_t +ip_checksum(const sa_family_t af, const uint8_t *payload, const int len_payload, + const uint8_t *src_addr, const uint8_t *dest_addr, const int proto); + #ifdef PACKET_TRUNCATION_CHECK void ipv4_packet_size_verify(const uint8_t *data, const int size, @@ -275,4 +333,7 @@ void ipv4_packet_size_verify(const uint8_t *data, #endif +#define OPENVPN_8021Q_MIN_VID 1 +#define OPENVPN_8021Q_MAX_VID 4094 + #endif /* ifndef PROTO_H */ |