[PATCH 01/17] net: ipv6: Add IPv6 basic primitives
Simon Glass
sjg at chromium.org
Mon Sep 12 15:34:39 CEST 2022
Hi Vyacheslav,
On Mon, 12 Sept 2022 at 04:11, Vyacheslav Mitrofanov V
<v.v.mitrofanov at yadro.com> wrote:
>
> On Mon, 2022-09-12 at 10:23 +0300, Ramon Fried wrote:
> > «Внимание! Данное письмо от внешнего адресата!»
> >
> > On Tue, Sep 6, 2022 at 6:10 PM Viacheslav Mitrofanov
> > <v.v.mitrofanov at yadro.com> wrote:
> > > This patch is a collection of basic primitives that are
> > > prerequisite for
> > > further IPv6 implementation.
> > >
> > > There are structures definition such as IPv6 header, UDP header
> > > (for TFTP), ICMPv6 header. There are auxiliary defines such as
> > > protocol
> > > codes, padding, struct size and etc. Also here are functions
> > > prototypes
> > > and its empty implementation that will be used as API for further
> > > patches.
> > > Here are variables declaration such as IPv6 address of our host,
> > > gateway, ipv6 server.
> > >
> > > Signed-off-by: Viacheslav Mitrofanov <v.v.mitrofanov at yadro.com>
> > > ---
> > > include/net6.h | 369
> > > +++++++++++++++++++++++++++++++++++++++++++++++++
> > > net/net6.c | 31 +++++
> > > 2 files changed, 400 insertions(+)
> > > create mode 100644 include/net6.h
> > > create mode 100644 net/net6.c
> > >
> > > diff --git a/include/net6.h b/include/net6.h
> > > new file mode 100644
> > > index 0000000000..80236bd5ac
> > > --- /dev/null
> > > +++ b/include/net6.h
> > > @@ -0,0 +1,369 @@
> > > +/* SPDX-License-Identifier: GPL-2.0+ */
> > > +/*
> > > + * Copyright (C) 2013 Allied Telesis Labs NZ
> > > + * Chris Packham, <judge.packham at gmail.com>
> > > + *
> > > + * Copyright (C) 2022 YADRO
> > > + * Viacheslav Mitrofanov <v.v.mitrofanov at yadro.com>
> > > + */
> > > +
> > > +#ifndef __NET6_H__
> > > +#define __NET6_H__
> > > +
> > > +#include <net.h>
> > > +#include <linux/ctype.h>
> > > +
> > > +/* 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
> > > +};
> > > +
> > > +#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 <asm/byteorder.h>"
> > > +#endif
> > > + u8 flow_lbl[3];
> > > + __be16 payload_len;
> > > + u8 nexthdr;
> > > + u8 hop_limit;
> > > + struct in6_addr saddr;
> > > + struct in6_addr daddr;
> > > +};
> > > +#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 } } }
> > > +
> > > +#define IPV6_LINK_LOCAL_PREFIX 0xfe80
> > > +
> > > +/* 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 <asm/byteorder.h>"
> > > +#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 <asm/byteorder.h>"
> > > +#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
> > > +};
> > > +
> > > +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 bool use_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)
> > > + *
> > > + * @param s IPv6 string addr format
> > > + * @param len IPv6 string addr length
> > > + * @param addr converted IPv6 addr
> > > + * @return 0 if conversion successful, -EINVAL if fail
> > > + */
> > > +static inline int
> > > +string_to_ip6(const char *s, size_t len, struct in6_addr *addr)
> > > +{
> > > + return -EINVAL;
> > > +}
> > > +
> > > +/**
> > > + * Check if IPv6 addr is not set i.e. is zero
> > > + *
> > > + * @param addr IPv6 addr
> > > + * @return 0 if addr is not set, -1 if is set
> > > + */
> > > +static inline int ip6_is_unspecified_addr(struct in6_addr *addr)
> > > +{
> > > + return -1;
> > > +}
> > > +
> > > +/**
> > > + * 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.
> > > + *
> > > + * @param addr addr to check
> > > + * @return 0 if addr is our, -1 otherwise
> > > + */
> > > +static inline int ip6_is_our_addr(struct in6_addr *addr)
> > > +{
> > > + return -1;
> > > +}
> > > +
> > > +/**
> > > + * Check if two IPv6 addresses are in the same subnet
> > > + *
> > > + * @param our_addr first IPv6 addr
> > > + * @param neigh_addr second IPv6 addr
> > > + * @param prefix_length network mask length
> > > + * @return 0 if two addresses in the same subnet, -1 otherwise
> > > + */
> > > +static inline int
> > > +ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr
> > > *neigh_addr,
> > > + u32 prefix_length)
> > > +{
> > > + return -1;
> > > +}
> > > +
> > > +/**
> > > + * Make up IPv6 Link Local address
> > > + *
> > > + * @param lladdr formed IPv6 Link Local address
> > > + * @param enetaddr MAC addr of a device
> > > + */
> > > +static inline void
> > > +ip6_make_lladdr(struct in6_addr *lladdr, unsigned char const
> > > enetaddr[6])
> > > +{
> > > +}
> > > +
> > > +/**
> > > + * Make up Solicited Node Multicast Address from IPv6 addr
> > > + *
> > > + * @param mcast_addr formed SNMA addr
> > > + * @param ip6_addr base IPv6 addr
> > > + */
> > > +static inline void
> > > +ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr
> > > *ip6_addr)
> > > +{
> > > +}
> > > +
> > > +/**
> > > + * Make up IPv6 multicast addr
> > > + *
> > > + * @param enetaddr MAC addr of a device
> > > + * @param mcast_addr formed IPv6 multicast addr
> > > + */
> > > +static inline void
> > > +ip6_make_mult_ethdstaddr(unsigned char enetaddr[6],
> > > + struct in6_addr *mcast_addr)
> > > +{
> > > +}
> > > +
> > > +/**
> > > + * Compute an internet checksum
> > > + *
> > > + * @param buff buffer to be checksummed
> > > + * @param len length of buffer
> > > + * @param sum initial sum to be added in
> > > + * @return internet checksum of the buffer
> > > + */
> > > +static inline unsigned int
> > > +csum_partial(const unsigned char *buff, int len, unsigned int sum)
> > > +{
> > > + return 0;
> > > +}
> > > +
> > > +/**
> > > + * Compute checksum of IPv6 "psuedo-header" per RFC2460 section
> > > 8.1
> > > + *
> > > + * @param saddr source IPv6 addr
> > > + * @param daddr destination IPv6 add
> > > + * @param len data length to be checksumed
> > > + * @param proto IPv6 above protocol code
> > > + * @param csum upper layer checksum
> > > + * @return computed checksum
> > > + */
> > > +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;
> > > +}
> > > +
> > > +/**
> > > + * Make up IPv6 header
> > > + *
> > > + * @param xip pointer to IPv6 header to be formed
> > > + * @param src source IPv6 addr
> > > + * @param dest destination IPv6 addr
> > > + * @param nextheader next header type
> > > + * @param hoplimit hop limit
> > > + * @param payload_len payload length
> > > + * @return IPv6 header length
> > > + */
> > > +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;
> > > +}
> > > +
> > > +/**
> > > + * Make up UDP packet and send it
> > > + *
> > > + * @param ether destination MAC addr
> > > + * @param dest destination IPv6 addr
> > > + * @param dport destination port
> > > + * @param sport source port
> > > + * @param len UDP packet length
> > > + * @return 0 if send successfully, -1 otherwise
> > > + */
> > > +static inline int
> > > +net_send_udp_packet6(uchar *ether, struct in6_addr *dest,
> > > + int dport, int sport, int len)
> > > +{
> > > + return -1;
> > > +}
> > > +
> > > +/**
> > > + * Handle IPv6 packet
> > > + *
> > > + * @param et pointer to the begining of the packet
> > > + * @param ip6 pointer to the begining of IPv6 protocol
> > > + * @param len incoming packet len
> > > + * @return 0 if handle packet successfully, -EINVAL in case of
> > > invalid protocol
> > > + */
> > > +static inline int
> > > +net_ip6_handler(struct ethernet_hdr *et, struct ip6_hdr *ip6,
> > > + int len)
> > > +{
> > > + return -EINVAL;
> > > +}
> > > +
> > > +/**
> > > + * Copy IPv6 addr
> > > + *
> > > + * @param to destination IPv6 addr
> > > + * @param from source IPv6 addr
> > > + */
> > > +static inline void net_copy_ip6(void *to, const void *from)
> > > +{
> > > +}
> > > +
> > > +#endif /* __NET6_H__ */
> > > diff --git a/net/net6.c b/net/net6.c
> > > new file mode 100644
> > > index 0000000000..7cd442e6e2
> > > --- /dev/null
> > > +++ b/net/net6.c
> > > @@ -0,0 +1,31 @@
> > > +// SPDX-License-Identifier: GPL-2.0+
> > > +/*
> > > + * Copyright (C) 2013 Allied Telesis Labs NZ
> > > + * Chris Packham, <judge.packham at gmail.com>
> > > + *
> > > + * Copyright (C) 2022 YADRO
> > > + * Viacheslav Mitrofanov <v.v.mitrofanov at yadro.com>
> > > + */
> > > +
> > > +/* Simple IPv6 network layer implementation */
> > > +
> > > +#include <common.h>
> > > +#include <env_internal.h>
> > > +#include <malloc.h>
> > > +#include <net.h>
> > > +#include <net6.h>
> > > +
> > > +/* NULL IPv6 address */
> > > +struct in6_addr const net_null_addr_ip6 = ZERO_IPV6_ADDR;
> > > +/* Our gateway's IPv6 address */
> > > +struct in6_addr net_gateway6 = ZERO_IPV6_ADDR;
> > > +/* Our IPv6 addr (0 = unknown) */
> > > +struct in6_addr net_ip6 = ZERO_IPV6_ADDR;
> > > +/* Our link local IPv6 addr (0 = unknown) */
> > > +struct in6_addr net_link_local_ip6 = ZERO_IPV6_ADDR;
> > > +/* set server IPv6 addr (0 = unknown) */
> > > +struct in6_addr net_server_ip6 = ZERO_IPV6_ADDR;
> > > +/* The prefix length of our network */
> > > +u32 net_prefix_length;
> > > +
> > > +bool use_ip6;
> > > --
> > > 2.25.1
> > >
> > Reviewed-by: Ramon Fried <rfried.dev at gmail.com>
>
> Hello, Ramon!
>
> Many thanks for your review!
> I'm sorry but some code that you have reviewed is version 3. I made
> version 4. It has small cosmetic changes.
>
> in cover letter...
> Changes in v3:
> - Added functions and structures description in whole patch-series
> - Removed memory allocation in on_ip6addr()
> - Some functions got return code from errno.h
> - Add to string_to_ip6() length parameter to avoid obligatory null
> termination
> - Add a lot of small decorative cnages
>
> Changes in v4:
> - Fixed funcs and structures style description
> - Added omitted tags
>
> I think this has happened because of my mistake that I didn't add
> version tags to each patch i.e. [01/17] instead of [v4,01/17]
> I can resend the whole series with these tags if it will be suitable
> for you!
Assuming you are using patman, you can add 'Series-version: 4' to one
of your commits and it will do this for you. It is much less
error-prone.
REgards,
Simon
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