c74e3ae9c8
Various ipv6 structs in the slirp headers are marked QEMU_PACKED, but they are actually naturally aligned and will have no padding in them. Instead of marking them with the 'packed' attribute, assert at compile time that they are the size we expect. This allows us to take the address of fields within the structs without risking undefined behaviour, and suppresses clang -Waddress-of-packed-member warnings. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
160 lines
4.9 KiB
C
160 lines
4.9 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 <glib.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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#if G_BYTE_ORDER == G_BIG_ENDIAN
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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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};
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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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};
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/*
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* We don't want to mark these ip6 structs as packed as they are naturally
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* correctly aligned; instead assert that there is no stray padding.
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* If we marked the struct as packed then we would be unable to take
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* the address of any of the fields in it.
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*/
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QEMU_BUILD_BUG_ON(sizeof(struct ip6) != 40);
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QEMU_BUILD_BUG_ON(sizeof(struct ip6_pseudohdr) != 40);
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#endif
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