[U-Boot] [RFC PATCH v2 07/11] net: IPv6 support
Chris Packham
judge.packham at gmail.com
Mon Nov 9 08:38:52 CET 2015
Adds basic support for IPv6. Neighbor discovery and ping6 are the only
things supported at the moment.
Helped-by: Hanna Hawa <hannah at marvell.com> [endian & alignment fixes]
Signed-off-by: Chris Packham <judge.packham at gmail.com>
---
Now we have something functional. With this and the next patch you can
do something like 'setenv ipaddr6 3ffe::1/64' and 'ping6 3ffe::2' should
work.
I seem to have a problem that when you send a ping6 for a non-existent
address that ends up stuck and the next non-ipv6 net operation tries to
resolve it. I suspect this is because the pending neighbor discovery
information isn't cleaned up properly, I need to look into that.
Changes in v2:
- split ping6 support into separate patch
- split environment variables into separate patch
- change ip6_ndisc_* to ndisc_*, fix CamelCase
include/net.h | 1 +
include/net6.h | 194 +++++++++++++++++++++++++++++++++++++
net/Makefile | 2 +
net/ndisc.c | 266 ++++++++++++++++++++++++++++++++++++++++++++++++++
net/ndisc.h | 25 +++++
net/net.c | 38 +++++++-
net/net6.c | 299 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 823 insertions(+), 2 deletions(-)
create mode 100644 net/ndisc.c
create mode 100644 net/ndisc.h
diff --git a/include/net.h b/include/net.h
index e8bd2b7..8b7c878 100644
--- a/include/net.h
+++ b/include/net.h
@@ -316,6 +316,7 @@ struct vlan_ethernet_hdr {
#define VLAN_ETHER_HDR_SIZE (sizeof(struct vlan_ethernet_hdr))
#define PROT_IP 0x0800 /* IP protocol */
+#define PROT_IP6 0x86DD /* IPv6 protocol */
#define PROT_ARP 0x0806 /* IP ARP protocol */
#define PROT_RARP 0x8035 /* IP ARP protocol */
#define PROT_VLAN 0x8100 /* IEEE 802.1q protocol */
diff --git a/include/net6.h b/include/net6.h
index a41eb87..ff97c39 100644
--- a/include/net6.h
+++ b/include/net6.h
@@ -22,6 +22,16 @@ struct in6_addr {
#define s6_addr32 in6_u.u6_addr32
};
+#define IN6ADDRSZ sizeof(struct in6_addr)
+#define INETHADDRSZ sizeof(net_ethaddr)
+
+#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
+
/**
* struct ipv6hdr - Internet Protocol V6 (IPv6) header.
*
@@ -45,6 +55,145 @@ struct ip6_hdr {
struct in6_addr daddr;
};
+#define IP6_HDR_SIZE (sizeof(struct ip6_hdr))
+
+/* 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
+
+enum {
+ __ND_OPT_PREFIX_INFO_END = 0,
+ ND_OPT_SOURCE_LL_ADDR = 1,
+ ND_OPT_TARGET_LL_ADDR = 2,
+ ND_OPT_PREFIX_INFO = 3,
+ ND_OPT_REDIRECT_HDR = 4,
+ ND_OPT_MTU = 5,
+ __ND_OPT_MAX
+};
+
+/* ICMPv6 */
+#define IPPROTO_ICMPV6 58
+/* hop limit for neighbour discovery packets */
+#define IPV6_NDISC_HOPLIMIT 255
+#define NDISC_TIMEOUT 5000UL
+#define NDISC_TIMEOUT_COUNT 3
+
+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;
+
+ union {
+ __be32 un_data32[1];
+ __be16 un_data16[2];
+ __u8 un_data8[4];
+
+ struct icmpv6_echo {
+ __be16 identifier;
+ __be16 sequence;
+ } u_echo;
+
+ 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 {
+ __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
+};
+
+struct nd_msg {
+ struct icmp6hdr icmph;
+ struct in6_addr target;
+ __u8 opt[0];
+};
+
+struct rs_msg {
+ struct icmp6hdr icmph;
+ __u8 opt[0];
+};
+
+struct ra_msg {
+ struct icmp6hdr icmph;
+ __u32 reachable_time;
+ __u32 retrans_timer;
+};
+
+struct echo_msg {
+ struct icmp6hdr icmph;
+ __u16 id;
+ __u16 sequence;
+};
+
+struct nd_opt_hdr {
+ __u8 nd_opt_type;
+ __u8 nd_opt_len;
+} __attribute__((__packed__));
+
+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 u_int32_t net_prefix_length; /* Our prefixlength (0 = unknown) */
+extern struct in6_addr net_server_ip6; /* Server IPv6 addr (0 = unknown) */
+
+#ifdef CONFIG_CMD_PING
+extern struct in6_addr net_ping_ip6; /* the ipv6 address to ping */
+#endif
+
/* ::ffff:0:0/96 is reserved for v4 mapped addresses */
static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
{
@@ -61,4 +210,49 @@ static inline int ipv6_addr_is_isatap(const struct in6_addr *a)
/* Convert a string to an ipv6 address */
int string_to_ip6(const char *s, struct in6_addr *addr);
+/* check that an IPv6 address is unspecified (zero) */
+int ip6_is_unspecified_addr(struct in6_addr *addr);
+
+/* check that an IPv6 address is ours */
+int ip6_is_our_addr(struct in6_addr *addr);
+
+void ip6_make_lladdr(struct in6_addr *lladr, unsigned char const enetaddr[6]);
+
+void ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr *ip6_addr);
+
+void ip6_make_mult_ethdstaddr(unsigned char enetaddr[6],
+ struct in6_addr *mcast_addr);
+
+/* check if neighbour is in the same subnet as us */
+int ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr *neigh_addr,
+ __u32 prefix_length);
+
+unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum);
+
+unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
+ struct in6_addr *daddr, __u16 len,
+ unsigned short proto, unsigned int csum);
+
+int ip6_add_hdr(uchar *xip, struct in6_addr *src, struct in6_addr *dest,
+ int nextheader, int hoplimit, int payload_len);
+
+/* sends an IPv6 echo request to a host */
+int ping6_send(void);
+
+/* starts a Ping6 process */
+void ping6_start(void);
+
+/* handles reception of icmpv6 echo request/reply */
+void ping6_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6,
+ int len);
+
+/* handler for incoming IPv6 echo packet */
+void net_ip6_handler(struct ethernet_hdr *et, struct ip6_hdr *ip6,
+ int len);
+
+/* copy IPv6 */
+static inline void net_copy_ip6(void *to, const void *from)
+{
+ memcpy((void *)to, from, sizeof(struct in6_addr));
+}
#endif /* __NET6_H__ */
diff --git a/net/Makefile b/net/Makefile
index 6da8019..d3534c0 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -21,3 +21,5 @@ obj-$(CONFIG_CMD_RARP) += rarp.o
obj-$(CONFIG_CMD_SNTP) += sntp.o
obj-$(CONFIG_CMD_NET) += tftp.o
obj-$(CONFIG_NET6) += net6.o
+obj-$(CONFIG_NET6) += ndisc.o
+obj-$(CONFIG_CMD_PING6) += ping6.o
diff --git a/net/ndisc.c b/net/ndisc.c
new file mode 100644
index 0000000..290eaee
--- /dev/null
+++ b/net/ndisc.c
@@ -0,0 +1,266 @@
+/*
+ * net/ndisc.c
+ *
+ * (C) Copyright 2013 Allied Telesis Labs NZ
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <net.h>
+#include <net6.h>
+#include "ndisc.h"
+
+/* IPv6 destination address of packet waiting for ND */
+struct in6_addr net_nd_sol_packet_ip6 = ZERO_IPV6_ADDR;
+/* IPv6 address we are expecting ND advert from */
+static struct in6_addr net_nd_rep_packet_ip6 = ZERO_IPV6_ADDR;
+/* MAC destination address of packet waiting for ND */
+uchar *net_nd_packet_mac;
+/* pointer to packet waiting to be transmitted after ND is resolved */
+uchar *net_nd_tx_packet;
+static uchar net_nd_packet_buf[PKTSIZE_ALIGN + PKTALIGN];
+/* size of packet waiting to be transmitted */
+int net_nd_tx_packet_size;
+/* the timer for ND resolution */
+ulong net_nd_timer_start;
+/* the number of requests we have sent so far */
+int net_nd_try;
+
+#define IP6_NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
+
+/**
+ * Insert an option into a neighbor discovery packet.
+ * Returns the number of bytes inserted (which may be >= len)
+ */
+static int
+ndisc_insert_option(struct nd_msg *ndisc, int type, u8 *data, int len)
+{
+ int space = IP6_NDISC_OPT_SPACE(len);
+
+ ndisc->opt[0] = type;
+ ndisc->opt[1] = space >> 3;
+ memcpy(&ndisc->opt[2], data, len);
+ len += 2;
+
+ /* fill the remainder with 0 */
+ if ((space - len) > 0)
+ memset(&ndisc->opt[len], 0, space - len);
+
+ return space;
+}
+
+/**
+ * Extract the Ethernet address from a neighbor discovery packet.
+ * Note that the link layer address could be anything but the only networking
+ * media that u-boot supports is Ethernet so we assume we're extracting a 6
+ * byte Ethernet MAC address.
+ */
+static void ndisc_extract_enetaddr(struct nd_msg *ndisc, uchar enetaddr[6])
+{
+ memcpy(enetaddr, &ndisc->opt[2], 6);
+}
+
+/**
+ * Check to see if the neighbor discovery packet has
+ * the specified option set.
+ */
+static int ndisc_has_option(struct ip6_hdr *ip6, __u8 type)
+{
+ struct nd_msg *ndisc = (struct nd_msg *)(((uchar *)ip6) + IP6_HDR_SIZE);
+
+ if (ip6->payload_len <= sizeof(struct icmp6hdr))
+ return 0;
+
+ return ndisc->opt[0] == type;
+}
+
+static void ip6_send_ns(struct in6_addr *neigh_addr)
+{
+ struct in6_addr dst_adr;
+ unsigned char enetaddr[6];
+ struct nd_msg *msg;
+ __u16 len;
+ uchar *pkt;
+
+ debug("sending neighbor solicitation for %pI6c our address %pI6c\n",
+ neigh_addr, &net_link_local_ip6);
+
+ /* calculate src, dest IPv6 addr and dest Eth addr */
+ ip6_make_snma(&dst_adr, neigh_addr);
+ ip6_make_mult_ethdstaddr(enetaddr, &dst_adr);
+ len = sizeof(struct icmp6hdr) + IN6ADDRSZ +
+ IP6_NDISC_OPT_SPACE(INETHADDRSZ);
+
+ pkt = (uchar *)net_tx_packet;
+ pkt += net_set_ether(pkt, enetaddr, PROT_IP6);
+ pkt += ip6_add_hdr(pkt, &net_link_local_ip6, &dst_adr, IPPROTO_ICMPV6,
+ IPV6_NDISC_HOPLIMIT, len);
+
+ /* ICMPv6 - NS */
+ msg = (struct nd_msg *)pkt;
+ msg->icmph.icmp6_type = IPV6_NDISC_NEIGHBOUR_SOLICITATION;
+ msg->icmph.icmp6_code = 0;
+ memset(&msg->icmph.icmp6_cksum, 0, sizeof(__be16));
+ memset(&msg->icmph.icmp6_unused, 0, sizeof(__be32));
+
+ /* Set the target address and llsaddr option */
+ net_copy_ip6(&msg->target, neigh_addr);
+ ndisc_insert_option(msg, ND_OPT_SOURCE_LL_ADDR, net_ethaddr,
+ INETHADDRSZ);
+
+ /* checksum */
+ msg->icmph.icmp6_cksum = csum_ipv6_magic(&net_link_local_ip6, &dst_adr,
+ len, IPPROTO_ICMPV6,
+ csum_partial((__u8 *)msg, len, 0));
+
+ pkt += len;
+
+ /* send it! */
+ net_send_packet(net_tx_packet, (pkt - net_tx_packet));
+}
+
+static void
+ip6_send_na(uchar *eth_dst_addr, struct in6_addr *neigh_addr,
+ struct in6_addr *target)
+{
+ struct nd_msg *msg;
+ __u16 len;
+ uchar *pkt;
+
+ debug("sending neighbor advertisement for %pI6c to %pI6c (%pM)\n",
+ target, neigh_addr, eth_dst_addr);
+
+ len = sizeof(struct icmp6hdr) + IN6ADDRSZ +
+ IP6_NDISC_OPT_SPACE(INETHADDRSZ);
+
+ pkt = (uchar *)net_tx_packet;
+ pkt += net_set_ether(pkt, eth_dst_addr, PROT_IP6);
+ pkt += ip6_add_hdr(pkt, &net_link_local_ip6, neigh_addr,
+ IPPROTO_ICMPV6, IPV6_NDISC_HOPLIMIT, len);
+
+ /* ICMPv6 - NA */
+ msg = (struct nd_msg *)pkt;
+ msg->icmph.icmp6_type = IPV6_NDISC_NEIGHBOUR_ADVERTISEMENT;
+ msg->icmph.icmp6_code = 0;
+ memset(&msg->icmph.icmp6_cksum, 0, sizeof(__be16));
+ memset(&msg->icmph.icmp6_unused, 0, sizeof(__be32));
+
+ /* Set the target address and lltargetaddr option */
+ net_copy_ip6(&msg->target, target);
+ ndisc_insert_option(msg, ND_OPT_TARGET_LL_ADDR, net_ethaddr,
+ INETHADDRSZ);
+
+ /* checksum */
+ msg->icmph.icmp6_cksum = csum_ipv6_magic(&net_link_local_ip6,
+ neigh_addr, len, IPPROTO_ICMPV6,
+ csum_partial((__u8 *)msg, len, 0));
+
+ pkt += len;
+
+ /* send it! */
+ net_send_packet(net_tx_packet, (pkt - net_tx_packet));
+}
+
+void ndisc_request(void)
+{
+ if (!ip6_addr_in_subnet(&net_ip6, &net_nd_sol_packet_ip6,
+ net_prefix_length)) {
+ if (ip6_is_unspecified_addr(&net_gateway6)) {
+ puts("## Warning: gatewayip6 is needed but not set\n");
+ net_nd_rep_packet_ip6 = net_nd_sol_packet_ip6;
+ } else {
+ net_nd_rep_packet_ip6 = net_gateway6;
+ }
+ } else {
+ net_nd_rep_packet_ip6 = net_nd_sol_packet_ip6;
+ }
+
+ ip6_send_ns(&net_nd_rep_packet_ip6);
+}
+
+int ndisc_timeout_check(void)
+{
+ ulong t;
+
+ if (ip6_is_unspecified_addr(&net_nd_sol_packet_ip6))
+ return 0;
+
+ t = get_timer(0);
+
+ /* check for NDISC timeout */
+ if ((t - net_nd_timer_start) > NDISC_TIMEOUT) {
+ net_nd_try++;
+ if (net_nd_try >= NDISC_TIMEOUT_COUNT) {
+ puts("\nNeighbour discovery retry count exceeded; "
+ "starting again\n");
+ net_nd_try = 0;
+ net_set_state(NETLOOP_FAIL);
+ } else {
+ net_nd_timer_start = t;
+ ndisc_request();
+ }
+ }
+ return 1;
+}
+
+void ndisc_init(void)
+{
+ net_nd_packet_mac = NULL;
+ net_nd_tx_packet = NULL;
+ net_nd_sol_packet_ip6 = net_null_addr_ip6;
+ net_nd_rep_packet_ip6 = net_null_addr_ip6;
+ net_nd_tx_packet_size = 0;
+ net_nd_tx_packet = &net_nd_packet_buf[0] + (PKTALIGN - 1);
+ net_nd_tx_packet -= (ulong)net_nd_tx_packet % PKTALIGN;
+}
+
+void ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len)
+{
+ struct icmp6hdr *icmp =
+ (struct icmp6hdr *)(((uchar *)ip6) + IP6_HDR_SIZE);
+ struct nd_msg *ndisc = (struct nd_msg *)icmp;
+ uchar neigh_eth_addr[6];
+
+ switch (icmp->icmp6_type) {
+ case IPV6_NDISC_NEIGHBOUR_SOLICITATION:
+ debug("received neighbor solicitation for %pI6c from %pI6c\n",
+ &ndisc->target, &ip6->saddr);
+ if (ip6_is_our_addr(&ndisc->target) &&
+ ndisc_has_option(ip6, ND_OPT_SOURCE_LL_ADDR)) {
+ ndisc_extract_enetaddr(ndisc, neigh_eth_addr);
+ ip6_send_na(neigh_eth_addr, &ip6->saddr,
+ &ndisc->target);
+ }
+ break;
+
+ case IPV6_NDISC_NEIGHBOUR_ADVERTISEMENT:
+ /* are we waiting for a reply ? */
+ if (ip6_is_unspecified_addr(&net_nd_sol_packet_ip6))
+ break;
+
+ if ((memcmp(&ndisc->target, &net_nd_rep_packet_ip6,
+ sizeof(struct in6_addr)) == 0) &&
+ ndisc_has_option(ip6, ND_OPT_TARGET_LL_ADDR)) {
+ ndisc_extract_enetaddr(ndisc, neigh_eth_addr);
+
+ /* save address for later use */
+ if (net_nd_packet_mac != NULL)
+ memcpy(net_nd_packet_mac, neigh_eth_addr, 6);
+
+ /* modify header, and transmit it */
+ memcpy(((struct ethernet_hdr *)net_nd_tx_packet)->et_dest,
+ neigh_eth_addr, 6);
+ net_send_packet(net_nd_tx_packet,
+ net_nd_tx_packet_size);
+
+ /* no ND request pending now */
+ net_nd_sol_packet_ip6 = net_null_addr_ip6;
+ net_nd_tx_packet_size = 0;
+ net_nd_packet_mac = NULL;
+ }
+ break;
+ default:
+ debug("Unexpected ICMPv6 type 0x%x\n", icmp->icmp6_type);
+ }
+}
diff --git a/net/ndisc.h b/net/ndisc.h
new file mode 100644
index 0000000..75138d0
--- /dev/null
+++ b/net/ndisc.h
@@ -0,0 +1,25 @@
+/*
+ * net/ndisc.h
+ *
+ * (C) Copyright 2013 Allied Telesis Labs NZ
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/* IPv6 destination address of packet waiting for ND */
+extern struct in6_addr net_nd_sol_packet_ip6;
+/* MAC destination address of packet waiting for ND */
+extern uchar *net_nd_packet_mac;
+/* pointer to packet waiting to be transmitted after ND is resolved */
+extern uchar *net_nd_tx_packet;
+/* size of packet waiting to be transmitted */
+extern int net_nd_tx_packet_size;
+/* the timer for ND resolution */
+extern ulong net_nd_timer_start;
+/* the number of requests we have sent so far */
+extern int net_nd_try;
+
+void ndisc_init(void);
+void ndisc_receive(struct ethernet_hdr *et, struct ip6_hdr *ip6, int len);
+void ndisc_request(void);
+int ndisc_timeout_check(void);
diff --git a/net/net.c b/net/net.c
index 2926bce..ca24673 100644
--- a/net/net.c
+++ b/net/net.c
@@ -86,6 +86,7 @@
#include <environment.h>
#include <errno.h>
#include <net.h>
+#include <net6.h>
#include <net/tftp.h>
#if defined(CONFIG_STATUS_LED)
#include <miiphy.h>
@@ -94,6 +95,7 @@
#include <watchdog.h>
#include <linux/compiler.h>
#include "arp.h"
+#include "ndisc.h"
#include "bootp.h"
#include "cdp.h"
#if defined(CONFIG_CMD_DNS)
@@ -341,8 +343,12 @@ void net_auto_load(void)
static void net_init_loop(void)
{
- if (eth_get_dev())
+ if (eth_get_dev()) {
memcpy(net_ethaddr, eth_get_ethaddr(), 6);
+#ifdef CONFIG_NET6
+ ip6_make_lladdr(&net_link_local_ip6, net_ethaddr);
+#endif
+ }
return;
}
@@ -376,6 +382,9 @@ void net_init(void)
(i + 1) * PKTSIZE_ALIGN;
}
arp_init();
+#ifdef CONFIG_NET6
+ ndisc_init();
+#endif
net_clear_handlers();
/* Only need to setup buffer pointers once. */
@@ -478,6 +487,11 @@ restart:
ping_start();
break;
#endif
+#ifdef CONFIG_CMD_PING6
+ case PING6:
+ ping6_start();
+ break;
+#endif
#if defined(CONFIG_CMD_NFS)
case NFS:
nfs_start();
@@ -555,6 +569,9 @@ restart:
if (ctrlc()) {
/* cancel any ARP that may not have completed */
net_arp_wait_packet_ip.s_addr = 0;
+#ifdef CONFIG_NET6
+ net_nd_sol_packet_ip6 = net_null_addr_ip6;
+#endif
net_cleanup_loop();
eth_halt();
@@ -570,7 +587,11 @@ restart:
}
if (arp_timeout_check() > 0) {
- time_start = get_timer(0);
+ time_start = get_timer(0);
+#ifdef CONFIG_NET6
+ } else if (ndisc_timeout_check() > 0) {
+ time_start = get_timer(0);
+#endif
}
/*
@@ -1143,6 +1164,11 @@ void net_process_received_packet(uchar *in_packet, int len)
rarp_receive(ip, len);
break;
#endif
+#ifdef CONFIG_NET6
+ case PROT_IP6:
+ net_ip6_handler(et, (struct ip6_hdr *)ip, len);
+ break;
+#endif
case PROT_IP:
debug_cond(DEBUG_NET_PKT, "Got IP\n");
/* Before we start poking the header, make sure it is there */
@@ -1297,6 +1323,14 @@ static int net_check_prereq(enum proto_t protocol)
}
goto common;
#endif
+#ifdef CONFIG_CMD_PING6
+ case PING6:
+ if (ip6_is_unspecified_addr(&net_ping_ip6)) {
+ puts("*** ERROR: ping address not given\n");
+ return 1;
+ }
+ goto common;
+#endif
#if defined(CONFIG_CMD_SNTP)
case SNTP:
if (net_ntp_server.s_addr == 0) {
diff --git a/net/net6.c b/net/net6.c
index f778cef..955a089 100644
--- a/net/net6.c
+++ b/net/net6.c
@@ -8,6 +8,34 @@
* SPDX-License-Identifier: GPL-2.0+
*/
+/*
+ * General Desription:
+ *
+ * The user interface supports commands for TFTP6.
+ * Also, we support Neighbour discovery internally. Depending on available
+ * data, these interact as follows:
+ *
+ * Neighbour Discovery:
+ *
+ * Prerequisites: - own ethernet address
+ * - own IPv6 address
+ * - TFTP server IPv6 address
+ * We want: - TFTP server ethernet address
+ * Next step: TFTP
+ *
+ * TFTP over IPv6:
+ *
+ * Prerequisites: - own ethernet address
+ * - own IPv6 address
+ * - TFTP server IPv6 address
+ * - TFTP server ethernet address
+ * - name of bootfile (if unknown, we use a default name
+ * derived from our own IPv6 address)
+ * We want: - load the boot file
+ * Next step: none
+ *
+ */
+#define DEBUG
#include <common.h>
#include <environment.h>
#include <malloc.h>
@@ -15,10 +43,14 @@
#include <net6.h>
#include "ndisc.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 */
@@ -87,3 +119,270 @@ static int on_serverip6(const char *name, const char *value, enum env_op op,
return string_to_ip6(value, &net_server_ip6);
}
U_BOOT_ENV_CALLBACK(serverip6, on_serverip6);
+
+int ip6_is_unspecified_addr(struct in6_addr *addr)
+{
+ return (addr->s6_addr32[0] | addr->s6_addr32[1] |
+ addr->s6_addr32[2] | addr->s6_addr32[3]) == 0;
+}
+
+/**
+ * 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.
+ */
+int ip6_is_our_addr(struct in6_addr *addr)
+{
+ return memcmp(addr, &net_link_local_ip6, sizeof(struct in6_addr)) == 0 ||
+ memcmp(addr, &net_ip6, sizeof(struct in6_addr)) == 0;
+}
+
+void ip6_make_eui(unsigned char eui[8], unsigned char const enetaddr[6])
+{
+ memcpy(eui, enetaddr, 3);
+ memcpy(&eui[5], &enetaddr[3], 3);
+ eui[3] = 0xFF;
+ eui[4] = 0xFE;
+ eui[0] ^= 2; /* "u" bit set to indicate global scope */
+}
+
+void ip6_make_lladdr(struct in6_addr *lladr, unsigned char const enetaddr[6])
+{
+ uchar eui[8];
+
+ memset(lladr, 0, sizeof(struct in6_addr));
+ lladr->s6_addr16[0] = htons(IPV6_LINK_LOCAL_PREFIX);
+ ip6_make_eui(eui, enetaddr);
+ memcpy(&lladr->s6_addr[8], eui, 8);
+}
+
+/*
+ * Given an IPv6 address generate an equivalent Solicited Node Multicast
+ * Address (SNMA) as described in RFC2461.
+ */
+void ip6_make_snma(struct in6_addr *mcast_addr, struct in6_addr *ip6_addr)
+{
+ memset(mcast_addr, 0, sizeof(struct in6_addr));
+ mcast_addr->s6_addr[0] = 0xff;
+ mcast_addr->s6_addr[1] = IPV6_ADDRSCOPE_LINK;
+ mcast_addr->s6_addr[11] = 0x01;
+ mcast_addr->s6_addr[12] = 0xff;
+ mcast_addr->s6_addr[13] = ip6_addr->s6_addr[13];
+ mcast_addr->s6_addr[14] = ip6_addr->s6_addr[14];
+ mcast_addr->s6_addr[15] = ip6_addr->s6_addr[15];
+}
+
+/*
+ * Given an IPv6 address generate the multicast MAC address that corresponds to
+ * it.
+ */
+void
+ip6_make_mult_ethdstaddr(unsigned char enetaddr[6], struct in6_addr *mcast_addr)
+{
+ enetaddr[0] = 0x33;
+ enetaddr[1] = 0x33;
+ memcpy(&enetaddr[2], &mcast_addr->s6_addr[12], 4);
+}
+
+int
+ip6_addr_in_subnet(struct in6_addr *our_addr, struct in6_addr *neigh_addr,
+ __u32 plen)
+{
+ __be32 *addr_dwords;
+ __be32 *neigh_dwords;
+
+ addr_dwords = our_addr->s6_addr32;
+ neigh_dwords = neigh_addr->s6_addr32;
+
+ while (plen > 32) {
+ if (*addr_dwords++ != *neigh_dwords++)
+ return 0;
+
+ plen -= 32;
+ }
+
+ /* Check any remaining bits. */
+ if (plen > 0) {
+ if ((*addr_dwords >> (32 - plen)) !=
+ (*neigh_dwords >> (32 - plen))) {
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+static inline unsigned int csum_fold(unsigned int sum)
+{
+ sum = (sum & 0xffff) + (sum >> 16);
+ sum = (sum & 0xffff) + (sum >> 16);
+
+ return ~sum;
+}
+
+static __u32 csum_do_csum(const __u8 *buff, int len)
+{
+ int odd, count;
+ unsigned long result = 0;
+
+ if (len <= 0)
+ goto out;
+ odd = 1 & (unsigned long)buff;
+ if (odd) {
+ result = *buff;
+ len--;
+ buff++;
+ }
+ count = len >> 1; /* nr of 16-bit words.. */
+ if (count) {
+ if (2 & (unsigned long)buff) {
+ result += *(unsigned short *)buff;
+ count--;
+ len -= 2;
+ buff += 2;
+ }
+ count >>= 1; /* nr of 32-bit words.. */
+ if (count) {
+ unsigned long carry = 0;
+ do {
+ unsigned long w = *(unsigned long *)buff;
+ count--;
+ buff += 4;
+ result += carry;
+ result += w;
+ carry = (w > result);
+ } while (count);
+ result += carry;
+ result = (result & 0xffff) + (result >> 16);
+ }
+ if (len & 2) {
+ result += *(unsigned short *)buff;
+ buff += 2;
+ }
+ }
+ if (len & 1)
+ result += (*buff << 8);
+ result = ~csum_fold(result);
+ if (odd)
+ result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
+out:
+ return result;
+}
+
+unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum)
+{
+ unsigned int result = csum_do_csum(buff, len);
+
+ /* add in old sum, and carry.. */
+ result += sum;
+ /* 16+c bits -> 16 bits */
+ result = (result & 0xffff) + (result >> 16);
+ return result;
+}
+
+/*
+ * Compute checksum of IPv6 "psuedo-header" per RFC2460 section 8.1
+ */
+unsigned short int
+csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr,
+ __u16 len, unsigned short proto, unsigned int csum)
+{
+ int i;
+ int carry;
+ __u32 ulen;
+ __u32 uproto;
+ unsigned int finalsum;
+
+ for (i = 0; i < 4; i++) {
+ csum += saddr->s6_addr32[i];
+ carry = (csum < saddr->s6_addr32[i]);
+ csum += carry;
+
+ csum += daddr->s6_addr32[i];
+ carry = (csum < daddr->s6_addr32[i]);
+ csum += carry;
+ }
+
+ ulen = htonl((__u32)len);
+ csum += ulen;
+ carry = (csum < ulen);
+ csum += carry;
+
+ uproto = htonl(proto);
+ csum += uproto;
+ carry = (csum < uproto);
+ csum += carry;
+
+ finalsum = csum_fold(csum);
+ if ((finalsum & 0xffff) == 0x0000)
+ return 0xffff;
+ else if ((finalsum & 0xffff) == 0xffff)
+ return 0x0000;
+ else
+ return finalsum;
+}
+
+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);
+}
+
+void 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 hlen;
+
+ if (len < IP6_HDR_SIZE)
+ return;
+
+ if (ip6->version != 6)
+ return;
+
+ switch (ip6->nexthdr) {
+ case IPPROTO_ICMPV6:
+ icmp = (struct icmp6hdr *)(((uchar *)ip6) + IP6_HDR_SIZE);
+ csum = icmp->icmp6_cksum;
+ hlen = ntohs(ip6->payload_len);
+ icmp->icmp6_cksum = 0;
+ /* checksum */
+ icmp->icmp6_cksum = csum_ipv6_magic(&ip6->saddr, &ip6->daddr,
+ hlen, IPPROTO_ICMPV6,
+ csum_partial((__u8 *)icmp, hlen, 0));
+ if (icmp->icmp6_cksum != csum)
+ return;
+
+ switch (icmp->icmp6_type) {
+ case IPV6_NDISC_NEIGHBOUR_SOLICITATION:
+ case IPV6_NDISC_NEIGHBOUR_ADVERTISEMENT:
+ ndisc_receive(et, ip6, len);
+ break;
+
+ default:
+ return;
+ break;
+ }
+ break;
+
+ default:
+ return;
+ break;
+ }
+}
--
2.5.3
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