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05061d8548
This patch adds an IPv6 address to the DNS relay. in6_equal_dns() is developed using this Slirp attribute. sotranslate_in/out/accept() are also updated to manage the IPv6 case so the guest can be able to join the host using one of the Slirp addresses. For now this only points to localhost. Further development will be needed to automatically fetch the IPv6 address from resolv.conf, and announce this via RDNSS. Signed-off-by: Guillaume Subiron <maethor@subiron.org> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Reviewed-by: Thomas Huth <thuth@redhat.com>
142 lines
4.2 KiB
C
142 lines
4.2 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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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[(prefix_len + 7) / 8]),
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&(b->s6_addr[(prefix_len + 7) / 8]),
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16 - (prefix_len + 7) / 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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/* 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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