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net: ipv6: Add implementation of main IPv6 functions
Functions that were exposed in "net: ipv6: Add IPv6 basic primitives" had only empty implementations and were exposed as API for futher patches. This patch add implementation of these functions. Main functions are: net_ip6_handler() - IPv6 packet handler for incoming packets; net_send_udp_packet6() - make up and send an UDP packet; csum_ipv6_magic() - compute checksum of IPv6 "psuedo-header" per RFC2460 section 8.1; ip6_addr_in_subnet() - check if an address is in our subnet. Other functions are auxiliary. Series-changes: 3 - Added comments - Fixed style problems - Fixed return codes instead of -1 Signed-off-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com> Reviewed-by: Ramon Fried <rfried.dev@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Viacheslav Mitrofanov
Tom Rini
parent
43ab8ecc7d
commit
1feb697830
2 changed files with 459 additions and 64 deletions
161
include/net6.h
161
include/net6.h
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@ -195,13 +195,6 @@ extern bool use_ip6;
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* Return: 0 if conversion successful, -EINVAL if fail
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*/
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int string_to_ip6(const char *s, size_t len, struct in6_addr *addr);
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#else
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static inline int
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string_to_ip6(const char *s, size_t len, struct in6_addr *addr)
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{
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return -EINVAL;
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}
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#endif
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/**
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* ip6_is_unspecified_addr() - Check if IPv6 addr is not set i.e. is zero
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@ -209,10 +202,7 @@ string_to_ip6(const char *s, size_t len, struct in6_addr *addr)
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* @addr: IPv6 addr
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* Return: 0 if addr is not set, -1 if is set
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*/
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static inline int ip6_is_unspecified_addr(struct in6_addr *addr)
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{
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return -1;
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}
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int ip6_is_unspecified_addr(struct in6_addr *addr);
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/**
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* ip6_is_our_addr() - Check if IPv6 addr belongs to our host addr
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@ -224,10 +214,7 @@ static inline int ip6_is_unspecified_addr(struct in6_addr *addr)
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* @addr: addr to check
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* Return: 0 if addr is our, -1 otherwise
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*/
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static inline int ip6_is_our_addr(struct in6_addr *addr)
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{
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return -1;
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}
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int ip6_is_our_addr(struct in6_addr *addr);
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/**
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* ip6_addr_in_subnet() - Check if two IPv6 addresses are in the same subnet
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@ -237,12 +224,8 @@ static inline int ip6_is_our_addr(struct in6_addr *addr)
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* @prefix_length: network mask length
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* Return: 0 if two addresses in the same subnet, -1 otherwise
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*/
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static inline int
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ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr *neigh_addr,
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u32 prefix_length)
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{
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return -1;
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}
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int ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr *neigh_addr,
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u32 prefix_length);
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/**
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* ip6_make_lladd() - rMake up IPv6 Link Local address
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@ -250,10 +233,7 @@ ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr *neigh_addr,
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* @lladdr: formed IPv6 Link Local address
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* @enetaddr: MAC addr of a device
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*/
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static inline void
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ip6_make_lladdr(struct in6_addr *lladdr, unsigned char const enetaddr[6])
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{
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}
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void ip6_make_lladdr(struct in6_addr *lladr, unsigned char const enetaddr[6]);
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/**
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* ip6_make_snma() - aMake up Solicited Node Multicast Address from IPv6 addr
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@ -261,10 +241,7 @@ ip6_make_lladdr(struct in6_addr *lladdr, unsigned char const enetaddr[6])
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* @mcast_addr: formed SNMA addr
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* @ip6_addr: base IPv6 addr
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*/
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static inline void
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ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr *ip6_addr)
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{
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}
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void ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr *ip6_addr);
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/**
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* ip6_make_mult_ethdstaddr() - Make up IPv6 multicast addr
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@ -272,11 +249,8 @@ ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr *ip6_addr)
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* @enetaddr: MAC addr of a device
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* @mcast_addr: formed IPv6 multicast addr
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*/
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static inline void
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ip6_make_mult_ethdstaddr(unsigned char enetaddr[6],
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struct in6_addr *mcast_addr)
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{
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}
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void ip6_make_mult_ethdstaddr(unsigned char enetaddr[6],
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struct in6_addr *mcast_addr);
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/**
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* csum_partial() - Compute an internet checksum
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@ -286,11 +260,7 @@ ip6_make_mult_ethdstaddr(unsigned char enetaddr[6],
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* @sum: initial sum to be added in
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* Return: internet checksum of the buffer
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*/
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static inline unsigned int
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csum_partial(const unsigned char *buff, int len, unsigned int sum)
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{
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return 0;
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}
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unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum);
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/**
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* csum_ipv6_magic() - Compute checksum of IPv6 "psuedo-header" per RFC2460 section 8.1
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@ -302,13 +272,9 @@ csum_partial(const unsigned char *buff, int len, unsigned int sum)
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* @csum: upper layer checksum
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* Return: computed checksum
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*/
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static inline unsigned short
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csum_ipv6_magic(struct in6_addr *saddr,
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struct in6_addr *daddr, u16 len,
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unsigned short proto, unsigned int csum)
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{
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return 0;
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}
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unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
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struct in6_addr *daddr, u16 len,
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unsigned short proto, unsigned int csum);
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/**
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* ip6_add_hdr() - Make up IPv6 header
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@ -321,12 +287,8 @@ csum_ipv6_magic(struct in6_addr *saddr,
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* @payload_len: payload length
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* Return: IPv6 header length
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*/
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static inline unsigned int
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ip6_add_hdr(uchar *xip, struct in6_addr *src, struct in6_addr *dest,
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int nextheader, int hoplimit, int payload_len)
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{
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return 0;
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}
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int ip6_add_hdr(uchar *xip, struct in6_addr *src, struct in6_addr *dest,
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int nextheader, int hoplimit, int payload_len);
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/**
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* net_send_udp_packet6() - Make up UDP packet and send it
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@ -338,12 +300,8 @@ ip6_add_hdr(uchar *xip, struct in6_addr *src, struct in6_addr *dest,
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* @len: UDP packet length
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* Return: 0 if send successfully, -1 otherwise
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*/
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static inline int
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net_send_udp_packet6(uchar *ether, struct in6_addr *dest,
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int dport, int sport, int len)
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{
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return -1;
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}
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int net_send_udp_packet6(uchar *ether, struct in6_addr *dest, int dport,
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int sport, int len);
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/**
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* net_ip6_handler() - Handle IPv6 packet
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@ -353,12 +311,7 @@ net_send_udp_packet6(uchar *ether, struct in6_addr *dest,
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* @len: incoming packet len
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* Return: 0 if handle packet successfully, -EINVAL in case of invalid protocol
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*/
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static inline int
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net_ip6_handler(struct ethernet_hdr *et, struct ip6_hdr *ip6,
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int len)
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{
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return -EINVAL;
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}
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int net_ip6_handler(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len);
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/**
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* net_copy_ip6() - Copy IPv6 addr
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@ -368,6 +321,86 @@ net_ip6_handler(struct ethernet_hdr *et, struct ip6_hdr *ip6,
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*/
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static inline void net_copy_ip6(void *to, const void *from)
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{
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memcpy((void *)to, from, sizeof(struct in6_addr));
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}
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#else
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static inline int
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string_to_ip6(const char *s, size_t len, struct in6_addr *addr)
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{
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return -EINVAL;
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}
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static inline int ip6_is_unspecified_addr(struct in6_addr *addr)
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{
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return -1;
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}
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static inline int ip6_is_our_addr(struct in6_addr *addr)
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{
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return -1;
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}
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static inline int
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ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr *neigh_addr,
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u32 prefix_length)
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{
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return -1;
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}
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static inline void
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ip6_make_lladdr(struct in6_addr *lladdr, unsigned char const enetaddr[6])
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{
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}
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static inline void
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ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr *ip6_addr)
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{
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}
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static inline void
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ip6_make_mult_ethdstaddr(unsigned char enetaddr[6],
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struct in6_addr *mcast_addr)
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{
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}
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static inline unsigned int
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csum_partial(const unsigned char *buff, int len, unsigned int sum)
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{
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return 0;
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}
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static inline unsigned short
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csum_ipv6_magic(struct in6_addr *saddr,
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struct in6_addr *daddr, u16 len,
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unsigned short proto, unsigned int csum)
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{
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return 0;
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}
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static inline unsigned int
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ip6_add_hdr(uchar *xip, struct in6_addr *src, struct in6_addr *dest,
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int nextheader, int hoplimit, int payload_len)
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{
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return 0;
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}
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static inline int
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net_send_udp_packet6(uchar *ether, struct in6_addr *dest,
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int dport, int sport, int len)
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{
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return -1;
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}
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static inline int
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net_ip6_handler(struct ethernet_hdr *et, struct ip6_hdr *ip6,
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int len)
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{
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return -EINVAL;
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}
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static inline void net_copy_ip6(void *to, const void *from)
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{
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}
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#endif
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#endif /* __NET6_H__ */
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362
net/net6.c
362
net/net6.c
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@ -14,6 +14,7 @@
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#include <malloc.h>
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#include <net.h>
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#include <net6.h>
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#include <ndisc.h>
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/* NULL IPv6 address */
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struct in6_addr const net_null_addr_ip6 = ZERO_IPV6_ADDR;
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@ -77,3 +78,364 @@ static int on_serverip6(const char *name, const char *value, enum env_op op,
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}
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U_BOOT_ENV_CALLBACK(serverip6, on_serverip6);
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int ip6_is_unspecified_addr(struct in6_addr *addr)
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{
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return !(addr->s6_addr32[0] | addr->s6_addr32[1] |
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addr->s6_addr32[2] | addr->s6_addr32[3]);
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}
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int ip6_is_our_addr(struct in6_addr *addr)
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{
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return !memcmp(addr, &net_link_local_ip6, sizeof(struct in6_addr)) ||
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!memcmp(addr, &net_ip6, sizeof(struct in6_addr));
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}
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void ip6_make_eui(unsigned char eui[8], unsigned char const enetaddr[6])
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{
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memcpy(eui, enetaddr, 3);
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memcpy(&eui[5], &enetaddr[3], 3);
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eui[3] = 0xff;
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eui[4] = 0xfe;
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eui[0] ^= 2; /* "u" bit set to indicate global scope */
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}
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void ip6_make_lladdr(struct in6_addr *lladr, unsigned char const enetaddr[6])
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{
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unsigned char eui[8];
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memset(lladr, 0, sizeof(struct in6_addr));
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lladr->s6_addr16[0] = htons(IPV6_LINK_LOCAL_PREFIX);
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ip6_make_eui(eui, enetaddr);
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memcpy(&lladr->s6_addr[8], eui, 8);
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}
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void ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr *ip6_addr)
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{
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memset(mcast_addr, 0, sizeof(struct in6_addr));
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mcast_addr->s6_addr[0] = 0xff;
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mcast_addr->s6_addr[1] = IPV6_ADDRSCOPE_LINK;
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mcast_addr->s6_addr[11] = 0x01;
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mcast_addr->s6_addr[12] = 0xff;
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mcast_addr->s6_addr[13] = ip6_addr->s6_addr[13];
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mcast_addr->s6_addr[14] = ip6_addr->s6_addr[14];
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mcast_addr->s6_addr[15] = ip6_addr->s6_addr[15];
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}
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void
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ip6_make_mult_ethdstaddr(unsigned char enetaddr[6], struct in6_addr *mcast_addr)
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{
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enetaddr[0] = 0x33;
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enetaddr[1] = 0x33;
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memcpy(&enetaddr[2], &mcast_addr->s6_addr[12], 4);
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}
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int
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ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr *neigh_addr,
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u32 plen)
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{
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__be32 *addr_dwords;
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__be32 *neigh_dwords;
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addr_dwords = our_addr->s6_addr32;
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neigh_dwords = neigh_addr->s6_addr32;
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while (plen > 32) {
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if (*addr_dwords++ != *neigh_dwords++)
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return 0;
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plen -= 32;
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}
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/* Check any remaining bits */
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if (plen > 0) {
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if ((*addr_dwords >> (32 - plen)) !=
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(*neigh_dwords >> (32 - plen))) {
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return 0;
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}
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}
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return 1;
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}
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static inline unsigned int csum_fold(unsigned int sum)
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{
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sum = (sum & 0xffff) + (sum >> 16);
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sum = (sum & 0xffff) + (sum >> 16);
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/* Opaque moment. If reverse it to zero it will not be checked on
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* receiver's side. It leads to bad negibour advertisement.
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*/
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if (sum == 0xffff)
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return sum;
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return ~sum;
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}
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static inline unsigned short from32to16(unsigned int x)
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{
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/* add up 16-bit and 16-bit for 16+c bit */
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x = (x & 0xffff) + (x >> 16);
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/* add up carry.. */
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x = (x & 0xffff) + (x >> 16);
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return x;
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}
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static u32 csum_do_csum(const u8 *buff, int len)
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{
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int odd;
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unsigned int result = 0;
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if (len <= 0)
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goto out;
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odd = 1 & (unsigned long)buff;
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if (odd) {
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#ifdef __LITTLE_ENDIAN
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result += (*buff << 8);
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#else
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result = *buff;
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#endif
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len--;
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buff++;
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}
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if (len >= 2) {
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if (2 & (unsigned long)buff) {
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result += *(unsigned short *)buff;
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len -= 2;
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buff += 2;
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}
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if (len >= 4) {
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const unsigned char *end = buff + ((u32)len & ~3);
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unsigned int carry = 0;
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do {
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unsigned int w = *(unsigned int *)buff;
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buff += 4;
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result += carry;
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result += w;
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carry = (w > result);
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} while (buff < end);
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result += carry;
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result = (result & 0xffff) + (result >> 16);
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}
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if (len & 2) {
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result += *(unsigned short *)buff;
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buff += 2;
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}
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}
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if (len & 1)
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#ifdef __LITTLE_ENDIAN
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result += *buff;
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#else
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result += (*buff << 8);
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#endif
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result = from32to16(result);
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if (odd)
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result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
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out:
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return result;
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}
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unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum)
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{
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unsigned int result = csum_do_csum(buff, len);
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/* add in old sum, and carry.. */
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result += sum;
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/* 16+c bits -> 16 bits */
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result = (result & 0xffff) + (result >> 16);
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return result;
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}
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unsigned short int
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csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, u16 len,
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unsigned short proto, unsigned int csum)
|
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{
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int carry;
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u32 ulen;
|
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u32 uproto;
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u32 sum = csum;
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sum += saddr->s6_addr32[0];
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carry = (sum < saddr->s6_addr32[0]);
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sum += carry;
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sum += saddr->s6_addr32[1];
|
||||
carry = (sum < saddr->s6_addr32[1]);
|
||||
sum += carry;
|
||||
|
||||
sum += saddr->s6_addr32[2];
|
||||
carry = (sum < saddr->s6_addr32[2]);
|
||||
sum += carry;
|
||||
|
||||
sum += saddr->s6_addr32[3];
|
||||
carry = (sum < saddr->s6_addr32[3]);
|
||||
sum += carry;
|
||||
|
||||
sum += daddr->s6_addr32[0];
|
||||
carry = (sum < daddr->s6_addr32[0]);
|
||||
sum += carry;
|
||||
|
||||
sum += daddr->s6_addr32[1];
|
||||
carry = (sum < daddr->s6_addr32[1]);
|
||||
sum += carry;
|
||||
|
||||
sum += daddr->s6_addr32[2];
|
||||
carry = (sum < daddr->s6_addr32[2]);
|
||||
sum += carry;
|
||||
|
||||
sum += daddr->s6_addr32[3];
|
||||
carry = (sum < daddr->s6_addr32[3]);
|
||||
sum += carry;
|
||||
|
||||
ulen = htonl((u32)len);
|
||||
sum += ulen;
|
||||
carry = (sum < ulen);
|
||||
sum += carry;
|
||||
|
||||
uproto = htonl(proto);
|
||||
sum += uproto;
|
||||
carry = (sum < uproto);
|
||||
sum += carry;
|
||||
|
||||
return csum_fold(sum);
|
||||
}
|
||||
|
||||
int ip6_add_hdr(uchar *xip, struct in6_addr *src, struct in6_addr *dest,
|
||||
int nextheader, int hoplimit, int payload_len)
|
||||
{
|
||||
struct ip6_hdr *ip6 = (struct ip6_hdr *)xip;
|
||||
|
||||
ip6->version = 6;
|
||||
ip6->priority = 0;
|
||||
ip6->flow_lbl[0] = 0;
|
||||
ip6->flow_lbl[1] = 0;
|
||||
ip6->flow_lbl[2] = 0;
|
||||
ip6->payload_len = htons(payload_len);
|
||||
ip6->nexthdr = nextheader;
|
||||
ip6->hop_limit = hoplimit;
|
||||
net_copy_ip6(&ip6->saddr, src);
|
||||
net_copy_ip6(&ip6->daddr, dest);
|
||||
|
||||
return sizeof(struct ip6_hdr);
|
||||
}
|
||||
|
||||
int net_send_udp_packet6(uchar *ether, struct in6_addr *dest, int dport,
|
||||
int sport, int len)
|
||||
{
|
||||
uchar *pkt;
|
||||
struct udp_hdr *udp;
|
||||
u16 csum_p;
|
||||
|
||||
udp = (struct udp_hdr *)((uchar *)net_tx_packet + net_eth_hdr_size() +
|
||||
IP6_HDR_SIZE);
|
||||
|
||||
udp->udp_dst = htons(dport);
|
||||
udp->udp_src = htons(sport);
|
||||
udp->udp_len = htons(len + UDP_HDR_SIZE);
|
||||
|
||||
/* checksum */
|
||||
udp->udp_xsum = 0;
|
||||
csum_p = csum_partial((u8 *)udp, len + UDP_HDR_SIZE, 0);
|
||||
udp->udp_xsum = csum_ipv6_magic(&net_ip6, dest, len + UDP_HDR_SIZE,
|
||||
IPPROTO_UDP, csum_p);
|
||||
|
||||
/* if MAC address was not discovered yet, save the packet and do
|
||||
* neighbour discovery
|
||||
*/
|
||||
if (!memcmp(ether, net_null_ethaddr, 6)) {
|
||||
net_copy_ip6(&net_nd_sol_packet_ip6, dest);
|
||||
net_nd_packet_mac = ether;
|
||||
|
||||
pkt = net_nd_tx_packet;
|
||||
pkt += net_set_ether(pkt, net_nd_packet_mac, PROT_IP6);
|
||||
pkt += ip6_add_hdr(pkt, &net_ip6, dest, IPPROTO_UDP, 64,
|
||||
len + UDP_HDR_SIZE);
|
||||
memcpy(pkt, (uchar *)udp, len + UDP_HDR_SIZE);
|
||||
|
||||
/* size of the waiting packet */
|
||||
net_nd_tx_packet_size = (pkt - net_nd_tx_packet) +
|
||||
UDP_HDR_SIZE + len;
|
||||
|
||||
/* and do the neighbor solicitation */
|
||||
net_nd_try = 1;
|
||||
net_nd_timer_start = get_timer(0);
|
||||
ndisc_request();
|
||||
return 1; /* waiting */
|
||||
}
|
||||
|
||||
pkt = (uchar *)net_tx_packet;
|
||||
pkt += net_set_ether(pkt, ether, PROT_IP6);
|
||||
pkt += ip6_add_hdr(pkt, &net_ip6, dest, IPPROTO_UDP, 64,
|
||||
len + UDP_HDR_SIZE);
|
||||
(void)eth_send(net_tx_packet, pkt - net_tx_packet + UDP_HDR_SIZE + len);
|
||||
|
||||
return 0; /* transmitted */
|
||||
}
|
||||
|
||||
int net_ip6_handler(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len)
|
||||
{
|
||||
struct in_addr zero_ip = {.s_addr = 0 };
|
||||
struct icmp6hdr *icmp;
|
||||
struct udp_hdr *udp;
|
||||
u16 csum;
|
||||
u16 csum_p;
|
||||
u16 hlen;
|
||||
|
||||
if (len < IP6_HDR_SIZE)
|
||||
return -EINVAL;
|
||||
|
||||
if (ip6->version != 6)
|
||||
return -EINVAL;
|
||||
|
||||
switch (ip6->nexthdr) {
|
||||
case PROT_ICMPV6:
|
||||
icmp = (struct icmp6hdr *)(((uchar *)ip6) + IP6_HDR_SIZE);
|
||||
csum = icmp->icmp6_cksum;
|
||||
hlen = ntohs(ip6->payload_len);
|
||||
icmp->icmp6_cksum = 0;
|
||||
/* checksum */
|
||||
csum_p = csum_partial((u8 *)icmp, hlen, 0);
|
||||
icmp->icmp6_cksum = csum_ipv6_magic(&ip6->saddr, &ip6->daddr,
|
||||
hlen, PROT_ICMPV6, csum_p);
|
||||
|
||||
if (icmp->icmp6_cksum != csum)
|
||||
return -EINVAL;
|
||||
|
||||
switch (icmp->icmp6_type) {
|
||||
case IPV6_NDISC_NEIGHBOUR_SOLICITATION:
|
||||
case IPV6_NDISC_NEIGHBOUR_ADVERTISEMENT:
|
||||
ndisc_receive(et, ip6, len);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
break;
|
||||
case IPPROTO_UDP:
|
||||
udp = (struct udp_hdr *)(((uchar *)ip6) + IP6_HDR_SIZE);
|
||||
csum = udp->udp_xsum;
|
||||
hlen = ntohs(ip6->payload_len);
|
||||
udp->udp_xsum = 0;
|
||||
/* checksum */
|
||||
csum_p = csum_partial((u8 *)udp, hlen, 0);
|
||||
udp->udp_xsum = csum_ipv6_magic(&ip6->saddr, &ip6->daddr,
|
||||
hlen, IPPROTO_UDP, csum_p);
|
||||
|
||||
if (csum != udp->udp_xsum)
|
||||
return -EINVAL;
|
||||
|
||||
/* IP header OK. Pass the packet to the current handler. */
|
||||
net_get_udp_handler()((uchar *)ip6 + IP6_HDR_SIZE +
|
||||
UDP_HDR_SIZE,
|
||||
ntohs(udp->udp_dst),
|
||||
zero_ip,
|
||||
ntohs(udp->udp_src),
|
||||
ntohs(udp->udp_len) - 8);
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue