[PATCH 01/17] net: ipv6: Add IPv6 basic primitives
Viacheslav Mitrofanov
v.v.mitrofanov at yadro.com
Tue Sep 6 17:09:39 CEST 2022
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
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