/* * QEMU network structures definitions and helper functions * * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com) * * Developed by Daynix Computing LTD (http://www.daynix.com) * * Portions developed by Free Software Foundation, Inc * Copyright (C) 1991-1997, 2001, 2003, 2006 Free Software Foundation, Inc. * See netinet/ip6.h and netinet/in.h (GNU C Library) * * Portions developed by Igor Kovalenko * Copyright (c) 2006 Igor Kovalenko * See hw/rtl8139.c (QEMU) * * Authors: * Dmitry Fleytman * Tamir Shomer * Yan Vugenfirer * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. * */ #ifndef QEMU_ETH_H #define QEMU_ETH_H #include "qemu/bswap.h" #include "qemu/iov.h" #define ETH_ALEN 6 #define ETH_HLEN 14 struct eth_header { uint8_t h_dest[ETH_ALEN]; /* destination eth addr */ uint8_t h_source[ETH_ALEN]; /* source ether addr */ uint16_t h_proto; /* packet type ID field */ }; struct vlan_header { uint16_t h_tci; /* priority and VLAN ID */ uint16_t h_proto; /* encapsulated protocol */ }; struct ip_header { uint8_t ip_ver_len; /* version and header length */ uint8_t ip_tos; /* type of service */ uint16_t ip_len; /* total length */ uint16_t ip_id; /* identification */ uint16_t ip_off; /* fragment offset field */ uint8_t ip_ttl; /* time to live */ uint8_t ip_p; /* protocol */ uint16_t ip_sum; /* checksum */ uint32_t ip_src, ip_dst; /* source and destination address */ }; typedef struct tcp_header { uint16_t th_sport; /* source port */ uint16_t th_dport; /* destination port */ uint32_t th_seq; /* sequence number */ uint32_t th_ack; /* acknowledgment number */ uint16_t th_offset_flags; /* data offset, reserved 6 bits, */ /* TCP protocol flags */ uint16_t th_win; /* window */ uint16_t th_sum; /* checksum */ uint16_t th_urp; /* urgent pointer */ } tcp_header; #define TCP_FLAGS_ONLY(flags) ((flags) & 0x3f) #define TCP_HEADER_FLAGS(tcp) \ TCP_FLAGS_ONLY(be16_to_cpu((tcp)->th_offset_flags)) #define TCP_HEADER_DATA_OFFSET(tcp) \ (((be16_to_cpu((tcp)->th_offset_flags) >> 12) & 0xf) << 2) typedef struct udp_header { uint16_t uh_sport; /* source port */ uint16_t uh_dport; /* destination port */ uint16_t uh_ulen; /* udp length */ uint16_t uh_sum; /* udp checksum */ } udp_header; typedef struct ip_pseudo_header { uint32_t ip_src; uint32_t ip_dst; uint8_t zeros; uint8_t ip_proto; uint16_t ip_payload; } ip_pseudo_header; /* IPv6 address */ struct in6_address { union { uint8_t __u6_addr8[16]; } __in6_u; }; struct ip6_header { union { struct ip6_hdrctl { uint32_t ip6_un1_flow; /* 4 bits version, 8 bits TC, 20 bits flow-ID */ uint16_t ip6_un1_plen; /* payload length */ uint8_t ip6_un1_nxt; /* next header */ uint8_t ip6_un1_hlim; /* hop limit */ } ip6_un1; uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits tclass */ struct ip6_ecn_access { uint8_t ip6_un3_vfc; /* 4 bits version, top 4 bits tclass */ uint8_t ip6_un3_ecn; /* 2 bits ECN, top 6 bits payload length */ } ip6_un3; } ip6_ctlun; struct in6_address ip6_src; /* source address */ struct in6_address ip6_dst; /* destination address */ }; struct ip6_ext_hdr { uint8_t ip6r_nxt; /* next header */ uint8_t ip6r_len; /* length in units of 8 octets */ }; struct udp_hdr { uint16_t uh_sport; /* source port */ uint16_t uh_dport; /* destination port */ uint16_t uh_ulen; /* udp length */ uint16_t uh_sum; /* udp checksum */ }; struct tcp_hdr { u_short th_sport; /* source port */ u_short th_dport; /* destination port */ uint32_t th_seq; /* sequence number */ uint32_t th_ack; /* acknowledgment number */ #ifdef HOST_WORDS_BIGENDIAN u_char th_off : 4, /* data offset */ th_x2:4; /* (unused) */ #else u_char th_x2 : 4, /* (unused) */ th_off:4; /* data offset */ #endif #define TH_ELN 0x1 /* explicit loss notification */ #define TH_ECN 0x2 /* explicit congestion notification */ #define TH_FS 0x4 /* fast start */ u_char th_flags; #define TH_FIN 0x01 #define TH_SYN 0x02 #define TH_RST 0x04 #define TH_PUSH 0x08 #define TH_ACK 0x10 #define TH_URG 0x20 u_short th_win; /* window */ u_short th_sum; /* checksum */ u_short th_urp; /* urgent pointer */ }; #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt #define ip6_ecn_acc ip6_ctlun.ip6_un3.ip6_un3_ecn #define PKT_GET_ETH_HDR(p) \ ((struct eth_header *)(p)) #define PKT_GET_VLAN_HDR(p) \ ((struct vlan_header *) (((uint8_t *)(p)) + sizeof(struct eth_header))) #define PKT_GET_DVLAN_HDR(p) \ (PKT_GET_VLAN_HDR(p) + 1) #define PKT_GET_IP_HDR(p) \ ((struct ip_header *)(((uint8_t *)(p)) + eth_get_l2_hdr_length(p))) #define IP_HDR_GET_LEN(p) \ ((((struct ip_header *)p)->ip_ver_len & 0x0F) << 2) #define PKT_GET_IP_HDR_LEN(p) \ (IP_HDR_GET_LEN(PKT_GET_IP_HDR(p))) #define PKT_GET_IP6_HDR(p) \ ((struct ip6_header *) (((uint8_t *)(p)) + eth_get_l2_hdr_length(p))) #define IP_HEADER_VERSION(ip) \ ((ip->ip_ver_len >> 4)&0xf) #define ETH_P_IP (0x0800) /* Internet Protocol packet */ #define ETH_P_ARP (0x0806) /* Address Resolution packet */ #define ETH_P_IPV6 (0x86dd) #define ETH_P_VLAN (0x8100) #define ETH_P_DVLAN (0x88a8) #define VLAN_VID_MASK 0x0fff #define IP_HEADER_VERSION_4 (4) #define IP_HEADER_VERSION_6 (6) #define IP_PROTO_TCP (6) #define IP_PROTO_UDP (17) #define IPTOS_ECN_MASK 0x03 #define IPTOS_ECN(x) ((x) & IPTOS_ECN_MASK) #define IPTOS_ECN_CE 0x03 #define IP6_ECN_MASK 0xC0 #define IP6_ECN(x) ((x) & IP6_ECN_MASK) #define IP6_ECN_CE 0xC0 #define IP4_DONT_FRAGMENT_FLAG (1 << 14) #define IS_SPECIAL_VLAN_ID(x) \ (((x) == 0) || ((x) == 0xFFF)) #define ETH_MAX_L2_HDR_LEN \ (sizeof(struct eth_header) + 2 * sizeof(struct vlan_header)) #define ETH_MAX_IP4_HDR_LEN (60) #define ETH_MAX_IP_DGRAM_LEN (0xFFFF) #define IP_FRAG_UNIT_SIZE (8) #define IP_FRAG_ALIGN_SIZE(x) ((x) & ~0x7) #define IP_RF 0x8000 /* reserved fragment flag */ #define IP_DF 0x4000 /* don't fragment flag */ #define IP_MF 0x2000 /* more fragments flag */ #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ #define IP6_EXT_GRANULARITY (8) /* Size granularity for IPv6 extension headers */ /* IP6 extension header types */ #define IP6_HOP_BY_HOP (0) #define IP6_ROUTING (43) #define IP6_FRAGMENT (44) #define IP6_ESP (50) #define IP6_AUTHENTICATION (51) #define IP6_NONE (59) #define IP6_DESTINATON (60) #define IP6_MOBILITY (135) static inline int is_multicast_ether_addr(const uint8_t *addr) { return 0x01 & addr[0]; } static inline int is_broadcast_ether_addr(const uint8_t *addr) { return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff; } static inline int is_unicast_ether_addr(const uint8_t *addr) { return !is_multicast_ether_addr(addr); } typedef enum { ETH_PKT_UCAST = 0xAABBCC00, ETH_PKT_BCAST, ETH_PKT_MCAST } eth_pkt_types_e; static inline eth_pkt_types_e get_eth_packet_type(const struct eth_header *ehdr) { if (is_broadcast_ether_addr(ehdr->h_dest)) { return ETH_PKT_BCAST; } else if (is_multicast_ether_addr(ehdr->h_dest)) { return ETH_PKT_MCAST; } else { /* unicast */ return ETH_PKT_UCAST; } } static inline uint32_t eth_get_l2_hdr_length(const void *p) { uint16_t proto = be16_to_cpu(PKT_GET_ETH_HDR(p)->h_proto); struct vlan_header *hvlan = PKT_GET_VLAN_HDR(p); switch (proto) { case ETH_P_VLAN: return sizeof(struct eth_header) + sizeof(struct vlan_header); case ETH_P_DVLAN: if (hvlan->h_proto == ETH_P_VLAN) { return sizeof(struct eth_header) + 2 * sizeof(struct vlan_header); } else { return sizeof(struct eth_header) + sizeof(struct vlan_header); } default: return sizeof(struct eth_header); } } static inline uint16_t eth_get_pkt_tci(const void *p) { uint16_t proto = be16_to_cpu(PKT_GET_ETH_HDR(p)->h_proto); struct vlan_header *hvlan = PKT_GET_VLAN_HDR(p); switch (proto) { case ETH_P_VLAN: case ETH_P_DVLAN: return be16_to_cpu(hvlan->h_tci); default: return 0; } } static inline bool eth_strip_vlan(const void *p, uint8_t *new_ehdr_buf, uint16_t *payload_offset, uint16_t *tci) { uint16_t proto = be16_to_cpu(PKT_GET_ETH_HDR(p)->h_proto); struct vlan_header *hvlan = PKT_GET_VLAN_HDR(p); struct eth_header *new_ehdr = (struct eth_header *) new_ehdr_buf; switch (proto) { case ETH_P_VLAN: case ETH_P_DVLAN: memcpy(new_ehdr->h_source, PKT_GET_ETH_HDR(p)->h_source, ETH_ALEN); memcpy(new_ehdr->h_dest, PKT_GET_ETH_HDR(p)->h_dest, ETH_ALEN); new_ehdr->h_proto = hvlan->h_proto; *tci = be16_to_cpu(hvlan->h_tci); *payload_offset = sizeof(struct eth_header) + sizeof(struct vlan_header); if (be16_to_cpu(new_ehdr->h_proto) == ETH_P_VLAN) { memcpy(PKT_GET_VLAN_HDR(new_ehdr), PKT_GET_DVLAN_HDR(p), sizeof(struct vlan_header)); *payload_offset += sizeof(struct vlan_header); } return true; default: return false; } } static inline uint16_t eth_get_l3_proto(const void *l2hdr, size_t l2hdr_len) { uint8_t *proto_ptr = (uint8_t *) l2hdr + l2hdr_len - sizeof(uint16_t); return be16_to_cpup((uint16_t *)proto_ptr); } void eth_setup_vlan_headers(struct eth_header *ehdr, uint16_t vlan_tag, bool *is_new); uint8_t eth_get_gso_type(uint16_t l3_proto, uint8_t *l3_hdr, uint8_t l4proto); void eth_get_protocols(const uint8_t *headers, uint32_t hdr_length, bool *isip4, bool *isip6, bool *isudp, bool *istcp); void eth_setup_ip4_fragmentation(const void *l2hdr, size_t l2hdr_len, void *l3hdr, size_t l3hdr_len, size_t l3payload_len, size_t frag_offset, bool more_frags); void eth_fix_ip4_checksum(void *l3hdr, size_t l3hdr_len); uint32_t eth_calc_pseudo_hdr_csum(struct ip_header *iphdr, uint16_t csl); bool eth_parse_ipv6_hdr(struct iovec *pkt, int pkt_frags, size_t ip6hdr_off, uint8_t *l4proto, size_t *full_hdr_len); #endif