udhcpc6: new applet. Not yet functional.

It builds. It sends Solicit packets. Not sure these packets are well-formed.
I have no server to test it against.

function                                             old     new   delta
udhcpc6_main                                           -    2426   +2426
d6_send_raw_packet                                     -     428    +428
d6_send_kernel_packet                                  -     274    +274
d6_recv_raw_packet                                     -     248    +248
send_d6_discover                                       -     177    +177
packed_usage                                       28795   28966    +171
d6_run_script                                          -     156    +156
send_d6_renew                                          -     140    +140
send_d6_release                                        -     126    +126
d6_recv_kernel_packet                                  -     116    +116
send_d6_select                                         -      95     +95
perform_d6_release                                     -      78     +78
d6_find_option                                         -      74     +74
init_d6_packet                                         -      54     +54
d6_copy_option                                         -      48     +48
d6_mcast_from_client_config_ifindex                    -      42     +42
d6_dump_packet                                         -      24     +24
static.FF02__1_2                                       -      16     +16
d6_store_blob                                          -      13     +13
applet_names                                        2432    2440      +8
applet_main                                         1412    1416      +4
applet_nameofs                                       706     708      +2
add_d6_client_options                                  -       1      +1
------------------------------------------------------------------------------
(add/remove: 21/0 grow/shrink: 4/0 up/down: 4721/0)          Total: 4721 bytes
   text	   data	    bss	    dec	    hex	filename
 879080	    493	   7584	 887157	  d8975	busybox_old
 884585	    497	   7584	 892666	  d9efa	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 118 insertions, 0 deletions

diff --git a/networking/udhcp/d6_common.h b/networking/udhcp/d6_common.h
new file mode 100644
index 000000000..88afaf8af
--- /dev/null
+++ b/networking/udhcp/d6_common.h
@@ -0,0 +1,118 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Copyright (C) 2011 Denys Vlasenko.
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+#ifndef UDHCP_D6_COMMON_H
+#define UDHCP_D6_COMMON_H 1
+
+#include <netinet/ip6.h>
+
+PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
+
+
+/*** DHCPv6 packet ***/
+
+/* DHCPv6 protocol. See RFC 3315 */
+#define D6_MSG_SOLICIT              1
+#define D6_MSG_ADVERTISE            2
+#define D6_MSG_REQUEST              3
+#define D6_MSG_CONFIRM              4
+#define D6_MSG_RENEW                5
+#define D6_MSG_REBIND               6
+#define D6_MSG_REPLY                7
+#define D6_MSG_RELEASE              8
+#define D6_MSG_DECLINE              9
+#define D6_MSG_RECONFIGURE         10
+#define D6_MSG_INFORMATION_REQUEST 11
+#define D6_MSG_RELAY_FORW          12
+#define D6_MSG_RELAY_REPL          13
+
+struct d6_packet {
+	union {
+		uint8_t d6_msg_type;
+		uint32_t d6_xid32;
+	} d6_u;
+	uint8_t d6_options[576 - sizeof(struct iphdr) - sizeof(struct udphdr) - 4
+			+ CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
+} PACKED;
+#define d6_msg_type d6_u.d6_msg_type
+#define d6_xid32    d6_u.d6_xid32
+
+struct ip6_udp_d6_packet {
+	struct ip6_hdr ip6;
+	struct udphdr udp;
+	struct d6_packet data;
+} PACKED;
+
+struct udp_d6_packet {
+	struct udphdr udp;
+	struct d6_packet data;
+} PACKED;
+
+/*** Options ***/
+
+struct d6_option {
+	uint8_t code;
+	uint8_t code_hi;
+	uint8_t len;
+	uint8_t len_hi;
+	uint8_t data[1];
+} PACKED;
+
+#define D6_OPT_CLIENTID       1
+#define D6_OPT_SERVERID       2
+#define D6_OPT_IA_NA          3
+#define D6_OPT_IA_TA          4
+#define D6_OPT_IAADDR         5
+#define D6_OPT_ORO            6
+#define D6_OPT_PREFERENCE     7
+#define D6_OPT_ELAPSED_TIME   8
+#define D6_OPT_RELAY_MSG      9
+#define D6_OPT_AUTH          11
+#define D6_OPT_UNICAST       12
+#define D6_OPT_STATUS_CODE   13
+#define D6_OPT_RAPID_COMMIT  14
+#define D6_OPT_USER_CLASS    15
+#define D6_OPT_VENDOR_CLASS  16
+#define D6_OPT_VENDOR_OPTS   17
+#define D6_OPT_INTERFACE_ID  18
+#define D6_OPT_RECONF_MSG    19
+#define D6_OPT_RECONF_ACCEPT 20
+
+/*** Other shared functions ***/
+
+struct client6_data_t {
+	struct d6_option *server_id;
+	struct d6_option *ia_na;
+};
+
+#define client6_data (*(struct client6_data_t*)(&bb_common_bufsiz1[COMMON_BUFSIZE - sizeof(struct client6_data_t)]))
+
+int FAST_FUNC d6_listen_socket(int port, const char *inf);
+
+int FAST_FUNC d6_recv_kernel_packet(
+		struct in6_addr *peer_ipv6,
+		struct d6_packet *packet, int fd
+);
+
+int FAST_FUNC d6_send_raw_packet(
+		struct d6_packet *d6_pkt, unsigned d6_pkt_size,
+		struct in6_addr *src_ipv6, int source_port,
+		struct in6_addr *dst_ipv6, int dest_port, const uint8_t *dest_arp,
+		int ifindex
+);
+
+int FAST_FUNC d6_send_kernel_packet(
+		struct d6_packet *d6_pkt, unsigned d6_pkt_size,
+		struct in6_addr *src_ipv6, int source_port,
+		struct in6_addr *dst_ipv6, int dest_port
+);
+
+void FAST_FUNC d6_dump_packet(struct d6_packet *packet);
+
+
+POP_SAVED_FUNCTION_VISIBILITY
+
+#endif