151 lines
4.5 KiB
C
151 lines
4.5 KiB
C
/*
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* Copyright (c) 2013
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* Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
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*/
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#ifndef SLIRP_IP6_H
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#define SLIRP_IP6_H
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#include "net/eth.h"
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#define ALLNODES_MULTICAST { .s6_addr = \
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{ 0xff, 0x02, 0x00, 0x00,\
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0x00, 0x00, 0x00, 0x00,\
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0x00, 0x00, 0x00, 0x00,\
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0x00, 0x00, 0x00, 0x01 } }
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#define SOLICITED_NODE_PREFIX { .s6_addr = \
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{ 0xff, 0x02, 0x00, 0x00,\
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0x00, 0x00, 0x00, 0x00,\
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0x00, 0x00, 0x00, 0x01,\
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0xff, 0x00, 0x00, 0x00 } }
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#define LINKLOCAL_ADDR { .s6_addr = \
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{ 0xfe, 0x80, 0x00, 0x00,\
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0x00, 0x00, 0x00, 0x00,\
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0x00, 0x00, 0x00, 0x00,\
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0x00, 0x00, 0x00, 0x02 } }
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#define ZERO_ADDR { .s6_addr = \
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{ 0x00, 0x00, 0x00, 0x00,\
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0x00, 0x00, 0x00, 0x00,\
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0x00, 0x00, 0x00, 0x00,\
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0x00, 0x00, 0x00, 0x00 } }
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static inline bool in6_equal(const struct in6_addr *a, const struct in6_addr *b)
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{
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return memcmp(a, b, sizeof(*a)) == 0;
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}
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static inline bool in6_equal_net(const struct in6_addr *a,
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const struct in6_addr *b,
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int prefix_len)
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{
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if (memcmp(a, b, prefix_len / 8) != 0) {
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return 0;
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}
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if (prefix_len % 8 == 0) {
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return 1;
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}
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return a->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8))
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== b->s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8));
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}
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static inline bool in6_equal_mach(const struct in6_addr *a,
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const struct in6_addr *b,
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int prefix_len)
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{
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if (memcmp(&(a->s6_addr[DIV_ROUND_UP(prefix_len, 8)]),
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&(b->s6_addr[DIV_ROUND_UP(prefix_len, 8)]),
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16 - DIV_ROUND_UP(prefix_len, 8)) != 0) {
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return 0;
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}
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if (prefix_len % 8 == 0) {
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return 1;
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}
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return (a->s6_addr[prefix_len / 8] & ((1U << (8 - (prefix_len % 8))) - 1))
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== (b->s6_addr[prefix_len / 8] & ((1U << (8 - (prefix_len % 8))) - 1));
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}
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#define in6_equal_router(a)\
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((in6_equal_net(a, &slirp->vprefix_addr6, slirp->vprefix_len)\
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&& in6_equal_mach(a, &slirp->vhost_addr6, slirp->vprefix_len))\
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|| (in6_equal_net(a, &(struct in6_addr)LINKLOCAL_ADDR, 64)\
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&& in6_equal_mach(a, &slirp->vhost_addr6, 64)))
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#define in6_equal_dns(a)\
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((in6_equal_net(a, &slirp->vprefix_addr6, slirp->vprefix_len)\
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&& in6_equal_mach(a, &slirp->vnameserver_addr6, slirp->vprefix_len))\
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|| (in6_equal_net(a, &(struct in6_addr)LINKLOCAL_ADDR, 64)\
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&& in6_equal_mach(a, &slirp->vnameserver_addr6, 64)))
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#define in6_equal_host(a)\
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(in6_equal_router(a) || in6_equal_dns(a))
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#define in6_solicitednode_multicast(a)\
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(in6_equal_net(a, &(struct in6_addr)SOLICITED_NODE_PREFIX, 104))
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#define in6_zero(a)\
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(in6_equal(a, &(struct in6_addr)ZERO_ADDR))
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/* Compute emulated host MAC address from its ipv6 address */
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static inline void in6_compute_ethaddr(struct in6_addr ip,
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uint8_t eth[ETH_ALEN])
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{
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eth[0] = 0x52;
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eth[1] = 0x56;
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memcpy(ð[2], &ip.s6_addr[16 - (ETH_ALEN - 2)], ETH_ALEN - 2);
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}
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/*
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* Definitions for internet protocol version 6.
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* Per RFC 2460, December 1998.
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*/
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#define IP6VERSION 6
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#define IP6_HOP_LIMIT 255
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/*
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* Structure of an internet header, naked of options.
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*/
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struct ip6 {
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#ifdef HOST_WORDS_BIGENDIAN
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uint32_t
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ip_v:4, /* version */
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ip_tc_hi:4, /* traffic class */
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ip_tc_lo:4,
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ip_fl_hi:4, /* flow label */
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ip_fl_lo:16;
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#else
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uint32_t
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ip_tc_hi:4,
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ip_v:4,
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ip_fl_hi:4,
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ip_tc_lo:4,
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ip_fl_lo:16;
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#endif
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uint16_t ip_pl; /* payload length */
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uint8_t ip_nh; /* next header */
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uint8_t ip_hl; /* hop limit */
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struct in6_addr ip_src, ip_dst; /* source and dest address */
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} QEMU_PACKED;
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/*
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* IPv6 pseudo-header used by upper-layer protocols
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*/
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struct ip6_pseudohdr {
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struct in6_addr ih_src; /* source internet address */
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struct in6_addr ih_dst; /* destination internet address */
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uint32_t ih_pl; /* upper-layer packet length */
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uint16_t ih_zero_hi; /* zero */
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uint8_t ih_zero_lo; /* zero */
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uint8_t ih_nh; /* next header */
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} QEMU_PACKED;
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#endif
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