fc6c9257c6
Adding icmp6_send_error to send ICMPv6 Error messages. This function is simpler than the v4 version. Adding some calls in various functions to send ICMP errors, when a received packet is too big, or when its hop limit is 0. Signed-off-by: Yann Bordenave <meow@meowstars.org> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Reviewed-by: Thomas Huth <thuth@redhat.com>
214 lines
6.8 KiB
C
214 lines
6.8 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_NETINET_ICMP6_H_
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#define SLIRP_NETINET_ICMP6_H_
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/*
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* Interface Control Message Protocol version 6 Definitions.
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* Per RFC 4443, March 2006.
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*
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* Network Discover Protocol Definitions.
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* Per RFC 4861, September 2007.
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*/
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struct icmp6_echo { /* Echo Messages */
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uint16_t id;
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uint16_t seq_num;
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};
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union icmp6_error_body {
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uint32_t unused;
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uint32_t pointer;
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uint32_t mtu;
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};
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/*
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* NDP Messages
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*/
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struct ndp_rs { /* Router Solicitation Message */
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uint32_t reserved;
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};
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struct ndp_ra { /* Router Advertisement Message */
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uint8_t chl; /* Cur Hop Limit */
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#ifdef HOST_WORDS_BIGENDIAN
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uint8_t
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M:1,
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O:1,
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reserved:6;
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#else
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uint8_t
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reserved:6,
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O:1,
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M:1;
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#endif
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uint16_t lifetime; /* Router Lifetime */
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uint32_t reach_time; /* Reachable Time */
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uint32_t retrans_time; /* Retrans Timer */
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} QEMU_PACKED;
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struct ndp_ns { /* Neighbor Solicitation Message */
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uint32_t reserved;
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struct in6_addr target; /* Target Address */
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} QEMU_PACKED;
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struct ndp_na { /* Neighbor Advertisement Message */
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#ifdef HOST_WORDS_BIGENDIAN
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uint32_t
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R:1, /* Router Flag */
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S:1, /* Solicited Flag */
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O:1, /* Override Flag */
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reserved_hi:5,
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reserved_lo:24;
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#else
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uint32_t
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reserved_hi:5,
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O:1,
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S:1,
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R:1,
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reserved_lo:24;
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#endif
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struct in6_addr target; /* Target Address */
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} QEMU_PACKED;
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struct ndp_redirect {
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uint32_t reserved;
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struct in6_addr target; /* Target Address */
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struct in6_addr dest; /* Destination Address */
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} QEMU_PACKED;
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/*
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* Structure of an icmpv6 header.
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*/
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struct icmp6 {
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uint8_t icmp6_type; /* type of message, see below */
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uint8_t icmp6_code; /* type sub code */
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uint16_t icmp6_cksum; /* ones complement cksum of struct */
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union {
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union icmp6_error_body error_body;
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struct icmp6_echo echo;
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struct ndp_rs ndp_rs;
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struct ndp_ra ndp_ra;
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struct ndp_ns ndp_ns;
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struct ndp_na ndp_na;
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struct ndp_redirect ndp_redirect;
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} icmp6_body;
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#define icmp6_err icmp6_body.error_body
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#define icmp6_echo icmp6_body.echo
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#define icmp6_nrs icmp6_body.ndp_rs
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#define icmp6_nra icmp6_body.ndp_ra
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#define icmp6_nns icmp6_body.ndp_ns
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#define icmp6_nna icmp6_body.ndp_na
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#define icmp6_redirect icmp6_body.ndp_redirect
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} QEMU_PACKED;
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#define ICMP6_MINLEN 4
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#define ICMP6_ERROR_MINLEN 8
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#define ICMP6_ECHO_MINLEN 8
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#define ICMP6_NDP_RS_MINLEN 8
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#define ICMP6_NDP_RA_MINLEN 16
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#define ICMP6_NDP_NS_MINLEN 24
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#define ICMP6_NDP_NA_MINLEN 24
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#define ICMP6_NDP_REDIRECT_MINLEN 40
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/*
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* NDP Options
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*/
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struct ndpopt {
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uint8_t ndpopt_type; /* Option type */
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uint8_t ndpopt_len; /* /!\ In units of 8 octets */
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union {
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unsigned char linklayer_addr[6]; /* Source/Target Link-layer */
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struct prefixinfo { /* Prefix Information */
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uint8_t prefix_length;
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#ifdef HOST_WORDS_BIGENDIAN
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uint8_t L:1, A:1, reserved1:6;
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#else
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uint8_t reserved1:6, A:1, L:1;
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#endif
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uint32_t valid_lt; /* Valid Lifetime */
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uint32_t pref_lt; /* Preferred Lifetime */
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uint32_t reserved2;
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struct in6_addr prefix;
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} QEMU_PACKED prefixinfo;
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} ndpopt_body;
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#define ndpopt_linklayer ndpopt_body.linklayer_addr
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#define ndpopt_prefixinfo ndpopt_body.prefixinfo
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} QEMU_PACKED;
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/* NDP options type */
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#define NDPOPT_LINKLAYER_SOURCE 1 /* Source Link-Layer Address */
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#define NDPOPT_LINKLAYER_TARGET 2 /* Target Link-Layer Address */
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#define NDPOPT_PREFIX_INFO 3 /* Prefix Information */
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/* NDP options size, in octets. */
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#define NDPOPT_LINKLAYER_LEN 8
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#define NDPOPT_PREFIXINFO_LEN 32
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/*
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* Definition of type and code field values.
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* Per https://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xml
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* Last Updated 2012-11-12
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*/
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/* Errors */
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#define ICMP6_UNREACH 1 /* Destination Unreachable */
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#define ICMP6_UNREACH_NO_ROUTE 0 /* no route to dest */
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#define ICMP6_UNREACH_DEST_PROHIB 1 /* com with dest prohibited */
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#define ICMP6_UNREACH_SCOPE 2 /* beyond scope of src addr */
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#define ICMP6_UNREACH_ADDRESS 3 /* address unreachable */
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#define ICMP6_UNREACH_PORT 4 /* port unreachable */
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#define ICMP6_UNREACH_SRC_FAIL 5 /* src addr failed */
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#define ICMP6_UNREACH_REJECT_ROUTE 6 /* reject route to dest */
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#define ICMP6_UNREACH_SRC_HDR_ERROR 7 /* error in src routing header */
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#define ICMP6_TOOBIG 2 /* Packet Too Big */
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#define ICMP6_TIMXCEED 3 /* Time Exceeded */
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#define ICMP6_TIMXCEED_INTRANS 0 /* hop limit exceeded in transit */
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#define ICMP6_TIMXCEED_REASS 1 /* ttl=0 in reass */
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#define ICMP6_PARAMPROB 4 /* Parameter Problem */
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#define ICMP6_PARAMPROB_HDR_FIELD 0 /* err header field */
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#define ICMP6_PARAMPROB_NXTHDR_TYPE 1 /* unrecognized Next Header type */
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#define ICMP6_PARAMPROB_IPV6_OPT 2 /* unrecognized IPv6 option */
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/* Informational Messages */
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#define ICMP6_ECHO_REQUEST 128 /* Echo Request */
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#define ICMP6_ECHO_REPLY 129 /* Echo Reply */
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#define ICMP6_NDP_RS 133 /* Router Solicitation (NDP) */
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#define ICMP6_NDP_RA 134 /* Router Advertisement (NDP) */
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#define ICMP6_NDP_NS 135 /* Neighbor Solicitation (NDP) */
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#define ICMP6_NDP_NA 136 /* Neighbor Advertisement (NDP) */
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#define ICMP6_NDP_REDIRECT 137 /* Redirect Message (NDP) */
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/*
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* Router Configuration Variables (rfc4861#section-6)
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*/
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#define NDP_IsRouter 1
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#define NDP_AdvSendAdvertisements 1
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#define NDP_MaxRtrAdvInterval 600000
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#define NDP_MinRtrAdvInterval ((NDP_MaxRtrAdvInterval >= 9) ? \
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NDP_MaxRtrAdvInterval / 3 : \
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NDP_MaxRtrAdvInterval)
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#define NDP_AdvManagedFlag 0
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#define NDP_AdvOtherConfigFlag 0
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#define NDP_AdvLinkMTU 0
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#define NDP_AdvReachableTime 0
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#define NDP_AdvRetransTime 0
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#define NDP_AdvCurHopLimit 64
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#define NDP_AdvDefaultLifetime ((3 * NDP_MaxRtrAdvInterval) / 1000)
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#define NDP_AdvValidLifetime 86400
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#define NDP_AdvOnLinkFlag 1
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#define NDP_AdvPrefLifetime 14400
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#define NDP_AdvAutonomousFlag 1
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void icmp6_init(Slirp *slirp);
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void icmp6_cleanup(Slirp *slirp);
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void icmp6_input(struct mbuf *);
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void icmp6_send_error(struct mbuf *m, uint8_t type, uint8_t code);
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void ndp_send_ra(Slirp *slirp);
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void ndp_send_ns(Slirp *slirp, struct in6_addr addr);
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#endif
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