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>
This commit is contained in:
Denys Vlasenko
parent
50089fc61c
commit
9ba75048c0
118
networking/udhcp/d6_common.h
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118
networking/udhcp/d6_common.h
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@ -0,0 +1,118 @@
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/* vi: set sw=4 ts=4: */
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/*
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* Copyright (C) 2011 Denys Vlasenko.
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#ifndef UDHCP_D6_COMMON_H
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#define UDHCP_D6_COMMON_H 1
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#include <netinet/ip6.h>
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PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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/*** DHCPv6 packet ***/
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/* DHCPv6 protocol. See RFC 3315 */
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#define D6_MSG_SOLICIT 1
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#define D6_MSG_ADVERTISE 2
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#define D6_MSG_REQUEST 3
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#define D6_MSG_CONFIRM 4
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#define D6_MSG_RENEW 5
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#define D6_MSG_REBIND 6
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#define D6_MSG_REPLY 7
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#define D6_MSG_RELEASE 8
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#define D6_MSG_DECLINE 9
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#define D6_MSG_RECONFIGURE 10
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#define D6_MSG_INFORMATION_REQUEST 11
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#define D6_MSG_RELAY_FORW 12
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#define D6_MSG_RELAY_REPL 13
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struct d6_packet {
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union {
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uint8_t d6_msg_type;
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uint32_t d6_xid32;
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} d6_u;
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uint8_t d6_options[576 - sizeof(struct iphdr) - sizeof(struct udphdr) - 4
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+ CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
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} PACKED;
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#define d6_msg_type d6_u.d6_msg_type
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#define d6_xid32 d6_u.d6_xid32
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struct ip6_udp_d6_packet {
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struct ip6_hdr ip6;
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struct udphdr udp;
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struct d6_packet data;
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} PACKED;
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struct udp_d6_packet {
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struct udphdr udp;
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struct d6_packet data;
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} PACKED;
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/*** Options ***/
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struct d6_option {
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uint8_t code;
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uint8_t code_hi;
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uint8_t len;
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uint8_t len_hi;
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uint8_t data[1];
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} PACKED;
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#define D6_OPT_CLIENTID 1
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#define D6_OPT_SERVERID 2
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#define D6_OPT_IA_NA 3
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#define D6_OPT_IA_TA 4
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#define D6_OPT_IAADDR 5
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#define D6_OPT_ORO 6
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#define D6_OPT_PREFERENCE 7
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#define D6_OPT_ELAPSED_TIME 8
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#define D6_OPT_RELAY_MSG 9
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#define D6_OPT_AUTH 11
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#define D6_OPT_UNICAST 12
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#define D6_OPT_STATUS_CODE 13
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#define D6_OPT_RAPID_COMMIT 14
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#define D6_OPT_USER_CLASS 15
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#define D6_OPT_VENDOR_CLASS 16
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#define D6_OPT_VENDOR_OPTS 17
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#define D6_OPT_INTERFACE_ID 18
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#define D6_OPT_RECONF_MSG 19
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#define D6_OPT_RECONF_ACCEPT 20
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/*** Other shared functions ***/
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struct client6_data_t {
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struct d6_option *server_id;
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struct d6_option *ia_na;
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};
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#define client6_data (*(struct client6_data_t*)(&bb_common_bufsiz1[COMMON_BUFSIZE - sizeof(struct client6_data_t)]))
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int FAST_FUNC d6_listen_socket(int port, const char *inf);
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int FAST_FUNC d6_recv_kernel_packet(
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struct in6_addr *peer_ipv6,
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struct d6_packet *packet, int fd
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);
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int FAST_FUNC d6_send_raw_packet(
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struct d6_packet *d6_pkt, unsigned d6_pkt_size,
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struct in6_addr *src_ipv6, int source_port,
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struct in6_addr *dst_ipv6, int dest_port, const uint8_t *dest_arp,
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int ifindex
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);
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int FAST_FUNC d6_send_kernel_packet(
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struct d6_packet *d6_pkt, unsigned d6_pkt_size,
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struct in6_addr *src_ipv6, int source_port,
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struct in6_addr *dst_ipv6, int dest_port
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);
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void FAST_FUNC d6_dump_packet(struct d6_packet *packet);
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POP_SAVED_FUNCTION_VISIBILITY
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#endif
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1404
networking/udhcp/d6_dhcpc.c
Normal file
1404
networking/udhcp/d6_dhcpc.c
Normal file
File diff suppressed because it is too large
Load Diff
168
networking/udhcp/d6_packet.c
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168
networking/udhcp/d6_packet.c
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@ -0,0 +1,168 @@
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/* vi: set sw=4 ts=4: */
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/*
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* Copyright (C) 2011 Denys Vlasenko.
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#include "common.h"
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#include "d6_common.h"
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#include "dhcpd.h"
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <netpacket/packet.h>
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#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
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void FAST_FUNC d6_dump_packet(struct d6_packet *packet)
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{
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if (dhcp_verbose < 2)
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return;
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bb_info_msg(
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" xid %x"
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, packet->d6_xid32
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);
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//*bin2hex(buf, (void *) packet->chaddr, sizeof(packet->chaddr)) = '\0';
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//bb_info_msg(" chaddr %s", buf);
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}
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#endif
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int FAST_FUNC d6_recv_kernel_packet(struct in6_addr *peer_ipv6
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UNUSED_PARAM
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, struct d6_packet *packet, int fd)
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{
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int bytes;
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memset(packet, 0, sizeof(*packet));
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bytes = safe_read(fd, packet, sizeof(*packet));
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if (bytes < 0) {
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log1("Packet read error, ignoring");
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return bytes; /* returns -1 */
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}
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if (bytes < offsetof(struct d6_packet, d6_options)) {
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bb_info_msg("Packet with bad magic, ignoring");
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return -2;
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}
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log1("Received a packet");
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d6_dump_packet(packet);
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return bytes;
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}
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/* Construct a ipv6+udp header for a packet, send packet */
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int FAST_FUNC d6_send_raw_packet(
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struct d6_packet *d6_pkt, unsigned d6_pkt_size,
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struct in6_addr *src_ipv6, int source_port,
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struct in6_addr *dst_ipv6, int dest_port, const uint8_t *dest_arp,
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int ifindex)
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{
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struct sockaddr_ll dest_sll;
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struct ip6_udp_d6_packet packet;
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int fd;
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int result = -1;
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const char *msg;
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fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IPV6));
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if (fd < 0) {
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msg = "socket(%s)";
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goto ret_msg;
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}
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memset(&dest_sll, 0, sizeof(dest_sll));
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memset(&packet, 0, offsetof(struct ip6_udp_d6_packet, data));
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packet.data = *d6_pkt; /* struct copy */
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dest_sll.sll_family = AF_PACKET;
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dest_sll.sll_protocol = htons(ETH_P_IPV6);
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dest_sll.sll_ifindex = ifindex;
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dest_sll.sll_halen = 6;
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memcpy(dest_sll.sll_addr, dest_arp, 6);
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if (bind(fd, (struct sockaddr *)&dest_sll, sizeof(dest_sll)) < 0) {
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msg = "bind(%s)";
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goto ret_close;
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}
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packet.ip6.ip6_vfc = (6 << 4); /* 4 bits version, top 4 bits of tclass */
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if (src_ipv6)
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packet.ip6.ip6_src = *src_ipv6; /* struct copy */
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packet.ip6.ip6_dst = *dst_ipv6; /* struct copy */
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packet.udp.source = htons(source_port);
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packet.udp.dest = htons(dest_port);
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/* size, excluding IP header: */
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packet.udp.len = htons(sizeof(struct udphdr) + d6_pkt_size);
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packet.ip6.ip6_plen = packet.udp.len;
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/* UDP checksum skips first four bytes of IP header.
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* IPv6 'hop limit' field should be 0.
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* 'next header' field should be summed as if it is in a different
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* position, therefore we write its value into ip6_hlim:
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*/
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packet.ip6.ip6_hlim = IPPROTO_UDP;
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packet.udp.check = inet_cksum((uint16_t *)&packet + 2,
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offsetof(struct ip6_udp_d6_packet, data) - 4 + d6_pkt_size);
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/* fix 'hop limit' and 'next header' after UDP checksumming */
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packet.ip6.ip6_hlim = 8;
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packet.ip6.ip6_nxt = IPPROTO_UDP;
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d6_dump_packet(d6_pkt);
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result = sendto(fd, &packet, offsetof(struct ip6_udp_d6_packet, data) + d6_pkt_size,
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/*flags:*/ 0,
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(struct sockaddr *) &dest_sll, sizeof(dest_sll)
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);
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msg = "sendto";
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ret_close:
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close(fd);
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if (result < 0) {
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ret_msg:
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bb_perror_msg(msg, "PACKET");
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}
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return result;
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}
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/* Let the kernel do all the work for packet generation */
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int FAST_FUNC d6_send_kernel_packet(
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struct d6_packet *d6_pkt, unsigned d6_pkt_size,
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struct in6_addr *src_ipv6, int source_port,
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struct in6_addr *dst_ipv6, int dest_port)
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{
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struct sockaddr_in6 sa;
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int fd;
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int result = -1;
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const char *msg;
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fd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
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if (fd < 0) {
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msg = "socket(%s)";
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goto ret_msg;
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}
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setsockopt_reuseaddr(fd);
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memset(&sa, 0, sizeof(sa));
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sa.sin6_family = AF_INET6;
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sa.sin6_port = htons(source_port);
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sa.sin6_addr = *src_ipv6; /* struct copy */
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if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
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msg = "bind(%s)";
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goto ret_close;
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}
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memset(&sa, 0, sizeof(sa));
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sa.sin6_family = AF_INET6;
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sa.sin6_port = htons(dest_port);
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sa.sin6_addr = *dst_ipv6; /* struct copy */
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if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
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msg = "connect";
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goto ret_close;
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}
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d6_dump_packet(d6_pkt);
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result = safe_write(fd, d6_pkt, d6_pkt_size);
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msg = "write";
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ret_close:
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close(fd);
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if (result < 0) {
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ret_msg:
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bb_perror_msg(msg, "UDP");
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}
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return result;
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}
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34
networking/udhcp/d6_socket.c
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34
networking/udhcp/d6_socket.c
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@ -0,0 +1,34 @@
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/* vi: set sw=4 ts=4: */
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/*
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* Copyright (C) 2011 Denys Vlasenko.
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#include "common.h"
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#include "d6_common.h"
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#include <net/if.h>
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int FAST_FUNC d6_listen_socket(int port, const char *inf)
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{
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int fd;
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struct sockaddr_in6 addr;
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log1("Opening listen socket on *:%d %s", port, inf);
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fd = xsocket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
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setsockopt_reuseaddr(fd);
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if (setsockopt_broadcast(fd) == -1)
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bb_perror_msg_and_die("SO_BROADCAST");
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/* NB: bug 1032 says this doesn't work on ethernet aliases (ethN:M) */
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if (setsockopt_bindtodevice(fd, inf))
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xfunc_die(); /* warning is already printed */
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memset(&addr, 0, sizeof(addr));
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addr.sin6_family = AF_INET6;
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addr.sin6_port = htons(port);
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/* addr.sin6_addr is all-zeros */
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xbind(fd, (struct sockaddr *)&addr, sizeof(addr));
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return fd;
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}
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