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Diffstat (limited to 'include/net/eth.h')
| -rw-r--r-- | include/net/eth.h | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/include/net/eth.h b/include/net/eth.h new file mode 100644 index 0000000000..1d48e06b22 --- /dev/null +++ b/include/net/eth.h @@ -0,0 +1,347 @@ +/* + * 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 <dmitry@daynix.com> + * Tamir Shomer <tamirs@daynix.com> + * Yan Vugenfirer <yan@daynix.com> + * + * 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 <sys/types.h> +#include <string.h> +#include "qemu/bswap.h" +#include "qemu/iov.h" + +#define ETH_ALEN 6 + +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; + +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_addr { + 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_addr ip6_src; /* source address */ + struct in6_addr 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) +#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 |