/* SPDX-License-Identifier: GPL-2.0+ */ /* * Copyright (C) 2013 Allied Telesis Labs NZ * Chris Packham, * * Copyright (C) 2022 YADRO * Viacheslav Mitrofanov */ #ifndef __NET6_H__ #define __NET6_H__ #include #include /* struct in6_addr - 128 bits long IPv6 address */ struct in6_addr { union { u8 u6_addr8[16]; __be16 u6_addr16[8]; __be32 u6_addr32[4]; } in6_u; #define s6_addr in6_u.u6_addr8 #define s6_addr16 in6_u.u6_addr16 #define s6_addr32 in6_u.u6_addr32 } __packed; #define IN6ADDRSZ sizeof(struct in6_addr) #define INETHADDRSZ sizeof(net_ethaddr) #define PROT_IP6 0x86DD /* IPv6 protocol */ #define PROT_ICMPV6 58 /* ICMPv6 protocol*/ #define IPV6_ADDRSCOPE_INTF 0x01 #define IPV6_ADDRSCOPE_LINK 0x02 #define IPV6_ADDRSCOPE_AMDIN 0x04 #define IPV6_ADDRSCOPE_SITE 0x05 #define IPV6_ADDRSCOPE_ORG 0x08 #define IPV6_ADDRSCOPE_GLOBAL 0x0E #define USE_IP6_CMD_PARAM "-ipv6" /** * struct ipv6hdr - Internet Protocol V6 (IPv6) header. * * IPv6 packet header as defined in RFC 2460. */ struct ip6_hdr { #if defined(__LITTLE_ENDIAN_BITFIELD) u8 priority:4, version:4; #elif defined(__BIG_ENDIAN_BITFIELD) u8 version:4, priority:4; #else #error "Please fix " #endif u8 flow_lbl[3]; __be16 payload_len; u8 nexthdr; u8 hop_limit; struct in6_addr saddr; struct in6_addr daddr; } __packed; #define IP6_HDR_SIZE (sizeof(struct ip6_hdr)) /* struct udp_hdr - User Datagram Protocol header */ struct udp_hdr { u16 udp_src; /* UDP source port */ u16 udp_dst; /* UDP destination port */ u16 udp_len; /* Length of UDP packet */ u16 udp_xsum; /* Checksum */ } __packed; /* * Handy for static initialisations of struct in6_addr, atlhough the * c99 '= { 0 }' idiom might work depending on you compiler. */ #define ZERO_IPV6_ADDR { { { 0x00, 0x00, 0x00, 0x00, \ 0x00, 0x00, 0x00, 0x00, \ 0x00, 0x00, 0x00, 0x00, \ 0x00, 0x00, 0x00, 0x00 } } } /* * All-routers multicast address is the link-local scope address to reach all * routers. */ #define ALL_ROUTERS_MULT_ADDR { { { 0xFF, 0x02, 0x00, 0x00, \ 0x00, 0x00, 0x00, 0x00, \ 0x00, 0x00, 0x00, 0x00, \ 0x00, 0x00, 0x00, 0x02 } } } #define IPV6_LINK_LOCAL_PREFIX 0xfe80 #define IPV6_LINK_LOCAL_MASK 0xffb0 /* The first 10-bit of address mask. */ /* hop limit for neighbour discovery packets */ #define IPV6_NDISC_HOPLIMIT 255 #define NDISC_TIMEOUT 5000UL #define NDISC_TIMEOUT_COUNT 3 /* struct icmp6hdr - Internet Control Message Protocol header for IPV6 */ struct icmp6hdr { u8 icmp6_type; #define IPV6_ICMP_ECHO_REQUEST 128 #define IPV6_ICMP_ECHO_REPLY 129 #define IPV6_NDISC_ROUTER_SOLICITATION 133 #define IPV6_NDISC_ROUTER_ADVERTISEMENT 134 #define IPV6_NDISC_NEIGHBOUR_SOLICITATION 135 #define IPV6_NDISC_NEIGHBOUR_ADVERTISEMENT 136 #define IPV6_NDISC_REDIRECT 137 u8 icmp6_code; __be16 icmp6_cksum; /* ICMPv6 data */ union { __be32 un_data32[1]; __be16 un_data16[2]; u8 un_data8[4]; /* struct icmpv6_echo - echo request/reply message format */ struct icmpv6_echo { __be16 identifier; __be16 sequence; } u_echo; /* struct icmpv6_nd_advt - Neighbor Advertisement format */ struct icmpv6_nd_advt { #if defined(__LITTLE_ENDIAN_BITFIELD) __be32 reserved:5, override:1, solicited:1, router:1, reserved2:24; #elif defined(__BIG_ENDIAN_BITFIELD) __be32 router:1, solicited:1, override:1, reserved:29; #else #error "Please fix " #endif } u_nd_advt; /* struct icmpv6_nd_ra - Router Advertisement format */ struct icmpv6_nd_ra { u8 hop_limit; #if defined(__LITTLE_ENDIAN_BITFIELD) u8 reserved:6, other:1, managed:1; #elif defined(__BIG_ENDIAN_BITFIELD) u8 managed:1, other:1, reserved:6; #else #error "Please fix " #endif __be16 rt_lifetime; } u_nd_ra; } icmp6_dataun; #define icmp6_identifier icmp6_dataun.u_echo.identifier #define icmp6_sequence icmp6_dataun.u_echo.sequence #define icmp6_pointer icmp6_dataun.un_data32[0] #define icmp6_mtu icmp6_dataun.un_data32[0] #define icmp6_unused icmp6_dataun.un_data32[0] #define icmp6_maxdelay icmp6_dataun.un_data16[0] #define icmp6_router icmp6_dataun.u_nd_advt.router #define icmp6_solicited icmp6_dataun.u_nd_advt.solicited #define icmp6_override icmp6_dataun.u_nd_advt.override #define icmp6_ndiscreserved icmp6_dataun.u_nd_advt.reserved #define icmp6_hop_limit icmp6_dataun.u_nd_ra.hop_limit #define icmp6_addrconf_managed icmp6_dataun.u_nd_ra.managed #define icmp6_addrconf_other icmp6_dataun.u_nd_ra.other #define icmp6_rt_lifetime icmp6_dataun.u_nd_ra.rt_lifetime } __packed; /* * struct icmp6_ra_prefix_info - Prefix Information option of the ICMPv6 message * The Prefix Information option provides hosts with on-link prefixes and * prefixes for Address Autoconfiguration. Refer to RFC 4861 for more info. */ struct icmp6_ra_prefix_info { u8 type; /* Type is 3 for Prefix Information. */ u8 len; /* Len is 4 for Prefix Information. */ /* The number of leading bits in the Prefix that are valid. */ u8 prefix_len; u8 reserved1:6, /* MUST be ignored by the receiver. */ aac:1, /* autonomous address-configuration flag */ /* Indicates that this prefix can be used for on-link determination. */ on_link:1; /* * The length of time in seconds that the prefix is valid for the * purpose of on-link determination. */ __be32 valid_lifetime; /* The length of time addresses remain preferred. */ __be32 preferred_lifetime; __be32 reserved2; /* MUST be ignored by the receiver. */ /* * Prefix is an IP address or a prefix of an IP address. The Prefix * Length field contains the number of valid leading bits in the prefix. * The bits in the prefix after the prefix length are reserved and MUST * be initialized to zero by the sender and ignored by the receiver. */ struct in6_addr prefix; }; extern struct in6_addr const net_null_addr_ip6; /* NULL IPv6 address */ extern struct in6_addr net_gateway6; /* Our gateways IPv6 address */ extern struct in6_addr net_ip6; /* Our IPv6 addr (0 = unknown) */ extern struct in6_addr net_link_local_ip6; /* Our link local IPv6 addr */ extern u32 net_prefix_length; /* Our prefixlength (0 = unknown) */ extern struct in6_addr net_server_ip6; /* Server IPv6 addr (0 = unknown) */ extern struct in6_addr net_ping_ip6; /* the ipv6 address to ping */ extern bool use_ip6; #if IS_ENABLED(CONFIG_IPV6) /** * string_to_ip6() - Convert IPv6 string addr to inner IPV6 addr format * * Examples of valid strings: * 2001:db8::0:1234:1 * 2001:0db8:0000:0000:0000:0000:1234:0001 * ::1 * ::ffff:192.168.1.1 * * Examples of invalid strings * 2001:db8::0::0 (:: can only appear once) * 2001:db8:192.168.1.1::1 (v4 part can only appear at the end) * 192.168.1.1 (we don't implicity map v4) * * @s: IPv6 string addr format * @len: IPv6 string addr length * @addr: converted IPv6 addr * Return: 0 if conversion successful, -EINVAL if fail */ int string_to_ip6(const char *s, size_t len, struct in6_addr *addr); /** * ip6_is_unspecified_addr() - Check if IPv6 addr is not set i.e. is zero * * @addr: IPv6 addr * Return: 0 if addr is not set, -1 if is set */ int ip6_is_unspecified_addr(struct in6_addr *addr); /** * ip6_is_our_addr() - Check if IPv6 addr belongs to our host addr * * We have 2 addresses that we should respond to. A link local address and a * global address. This returns true if the specified address matches either * of these. * * @addr: addr to check * Return: 0 if addr is our, -1 otherwise */ int ip6_is_our_addr(struct in6_addr *addr); /** * ip6_addr_in_subnet() - Check if two IPv6 addresses are in the same subnet * * @our_addr: first IPv6 addr * @neigh_addr: second IPv6 addr * @prefix_length: network mask length * Return: 0 if two addresses in the same subnet, -1 otherwise */ int ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr *neigh_addr, u32 prefix_length); /** * ip6_make_lladd() - rMake up IPv6 Link Local address * * @lladdr: formed IPv6 Link Local address * @enetaddr: MAC addr of a device */ void ip6_make_lladdr(struct in6_addr *lladr, unsigned char const enetaddr[6]); /** * ip6_make_snma() - aMake up Solicited Node Multicast Address from IPv6 addr * * @mcast_addr: formed SNMA addr * @ip6_addr: base IPv6 addr */ void ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr *ip6_addr); /** * ip6_make_mult_ethdstaddr() - Make up IPv6 multicast addr * * @enetaddr: MAC addr of a device * @mcast_addr: formed IPv6 multicast addr */ void ip6_make_mult_ethdstaddr(unsigned char enetaddr[6], struct in6_addr *mcast_addr); /** * csum_partial() - Compute an internet checksum * * @buff: buffer to be checksummed * @len: length of buffer * @sum: initial sum to be added in * Return: internet checksum of the buffer */ unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum); /** * csum_ipv6_magic() - Compute checksum of IPv6 "psuedo-header" per RFC2460 section 8.1 * * @saddr: source IPv6 addr * @daddr: destination IPv6 add * @len: data length to be checksummed * @proto: IPv6 above protocol code * @csum: upper layer checksum * Return: computed checksum */ unsigned short int csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, u16 len, unsigned short proto, unsigned int csum); /** * ip6_add_hdr() - Make up IPv6 header * * @xip: pointer to IPv6 header to be formed * @src: source IPv6 addr * @dest: destination IPv6 addr * @nextheader: next header type * @hoplimit: hop limit * @payload_len: payload length * Return: IPv6 header length */ int ip6_add_hdr(uchar *xip, struct in6_addr *src, struct in6_addr *dest, int nextheader, int hoplimit, int payload_len); /** * net_send_udp_packet6() - Make up UDP packet and send it * * @ether: destination MAC addr * @dest: destination IPv6 addr * @dport: destination port * @sport: source port * @len: UDP packet length * Return: 0 if send successfully, -1 otherwise */ int net_send_udp_packet6(uchar *ether, struct in6_addr *dest, int dport, int sport, int len); /** * net_ip6_handler() - Handle IPv6 packet * * @et: pointer to the beginning of the packet * @ip6: pointer to the beginning of IPv6 protocol * @len: incoming packet len * Return: 0 if handle packet successfully, -EINVAL in case of invalid protocol */ int net_ip6_handler(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len); /** * net_copy_ip6() - Copy IPv6 addr * * @to: destination IPv6 addr * @from: source IPv6 addr */ static inline void net_copy_ip6(void *to, const void *from) { memcpy((void *)to, from, sizeof(struct in6_addr)); } #else static inline int string_to_ip6(const char *s, size_t len, struct in6_addr *addr) { return -EINVAL; } static inline int ip6_is_unspecified_addr(struct in6_addr *addr) { return -1; } static inline int ip6_is_our_addr(struct in6_addr *addr) { return -1; } static inline int ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr *neigh_addr, u32 prefix_length) { return -1; } static inline void ip6_make_lladdr(struct in6_addr *lladdr, unsigned char const enetaddr[6]) { } static inline void ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr *ip6_addr) { } static inline void ip6_make_mult_ethdstaddr(unsigned char enetaddr[6], struct in6_addr *mcast_addr) { } static inline unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum) { return 0; } static inline unsigned short csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, u16 len, unsigned short proto, unsigned int csum) { return 0; } static inline unsigned int ip6_add_hdr(uchar *xip, struct in6_addr *src, struct in6_addr *dest, int nextheader, int hoplimit, int payload_len) { return 0; } static inline int net_send_udp_packet6(uchar *ether, struct in6_addr *dest, int dport, int sport, int len) { return -1; } static inline int net_ip6_handler(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len) { return -EINVAL; } static inline void net_copy_ip6(void *to, const void *from) { } #endif #if IS_ENABLED(CONFIG_CMD_PING6) /* Send ping requset */ void ping6_start(void); /** * ping6_receive() - Handle reception of ICMPv6 echo request/reply * * @et: pointer to incoming patcket * @ip6: pointer to IPv6 protocol * @len: packet length * Return: 0 if success, -EINVAL in case of failure during reception */ int ping6_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len); #else static inline void ping6_start(void) { } static inline int ping6_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len) { return -EINVAL; } #endif /* CONFIG_CMD_PING6 */ #endif /* __NET6_H__ */