zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/app/busybox/src/networking/udhcp/packet.c b/ap/app/busybox/src/networking/udhcp/packet.c
new file mode 100644
index 0000000..33c9585
--- /dev/null
+++ b/ap/app/busybox/src/networking/udhcp/packet.c
@@ -0,0 +1,227 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Packet ops
+ *
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+#include "common.h"
+#include "dhcpd.h"
+#include <netinet/in.h>
+#include <netinet/if_ether.h>
+#include <netpacket/packet.h>
+
+void FAST_FUNC udhcp_init_header(struct dhcp_packet *packet, char type)
+{
+ memset(packet, 0, sizeof(*packet));
+ packet->op = BOOTREQUEST; /* if client to a server */
+ switch (type) {
+ case DHCPOFFER:
+ case DHCPACK:
+ case DHCPNAK:
+ packet->op = BOOTREPLY; /* if server to client */
+ }
+ packet->htype = 1; /* ethernet */
+ packet->hlen = 6;
+ packet->cookie = htonl(DHCP_MAGIC);
+ if (DHCP_END != 0)
+ packet->options[0] = DHCP_END;
+ udhcp_add_simple_option(packet, DHCP_MESSAGE_TYPE, type);
+}
+
+#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
+void FAST_FUNC udhcp_dump_packet(struct dhcp_packet *packet)
+{
+ char buf[sizeof(packet->chaddr)*2 + 1];
+
+ if (dhcp_verbose < 2)
+ return;
+
+ bb_info_msg(
+ //" op %x"
+ //" htype %x"
+ " hlen %x"
+ //" hops %x"
+ " xid %x"
+ //" secs %x"
+ //" flags %x"
+ " ciaddr %x"
+ " yiaddr %x"
+ " siaddr %x"
+ " giaddr %x"
+ //" chaddr %s"
+ //" sname %s"
+ //" file %s"
+ //" cookie %x"
+ //" options %s"
+ //, packet->op
+ //, packet->htype
+ , packet->hlen
+ //, packet->hops
+ , packet->xid
+ //, packet->secs
+ //, packet->flags
+ , packet->ciaddr
+ , packet->yiaddr
+ , packet->siaddr_nip
+ , packet->gateway_nip
+ //, packet->chaddr[16]
+ //, packet->sname[64]
+ //, packet->file[128]
+ //, packet->cookie
+ //, packet->options[]
+ );
+ *bin2hex(buf, (void *) packet->chaddr, sizeof(packet->chaddr)) = '\0';
+ bb_info_msg(" chaddr %s", buf);
+}
+#endif
+
+/* Read a packet from socket fd, return -1 on read error, -2 on packet error */
+int FAST_FUNC udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd)
+{
+ int bytes;
+
+ memset(packet, 0, sizeof(*packet));
+ bytes = safe_read(fd, packet, sizeof(*packet));
+ if (bytes < 0) {
+ log1("Packet read error, ignoring");
+ return bytes; /* returns -1 */
+ }
+
+ if (bytes < offsetof(struct dhcp_packet, options)
+ || packet->cookie != htonl(DHCP_MAGIC)
+ ) {
+ bb_info_msg("Packet with bad magic, ignoring");
+ return -2;
+ }
+ log1("Received a packet");
+ udhcp_dump_packet(packet);
+
+ return bytes;
+}
+
+/* Construct a ip/udp header for a packet, send packet */
+int FAST_FUNC udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
+ uint32_t source_nip, int source_port,
+ uint32_t dest_nip, int dest_port, const uint8_t *dest_arp,
+ int ifindex)
+{
+ struct sockaddr_ll dest_sll;
+ struct ip_udp_dhcp_packet packet;
+ unsigned padding;
+ int fd;
+ int result = -1;
+ const char *msg;
+
+ fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
+ if (fd < 0) {
+ msg = "socket(%s)";
+ goto ret_msg;
+ }
+
+ memset(&dest_sll, 0, sizeof(dest_sll));
+ memset(&packet, 0, offsetof(struct ip_udp_dhcp_packet, data));
+ packet.data = *dhcp_pkt; /* struct copy */
+
+ dest_sll.sll_family = AF_PACKET;
+ dest_sll.sll_protocol = htons(ETH_P_IP);
+ dest_sll.sll_ifindex = ifindex;
+ dest_sll.sll_halen = 6;
+ memcpy(dest_sll.sll_addr, dest_arp, 6);
+
+ if (bind(fd, (struct sockaddr *)&dest_sll, sizeof(dest_sll)) < 0) {
+ msg = "bind(%s)";
+ goto ret_close;
+ }
+
+ /* We were sending full-sized DHCP packets (zero padded),
+ * but some badly configured servers were seen dropping them.
+ * Apparently they drop all DHCP packets >576 *ethernet* octets big,
+ * whereas they may only drop packets >576 *IP* octets big
+ * (which for typical Ethernet II means 590 octets: 6+6+2 + 576).
+ *
+ * In order to work with those buggy servers,
+ * we truncate packets after end option byte.
+ */
+ padding = DHCP_OPTIONS_BUFSIZE - 1 - udhcp_end_option(packet.data.options);
+
+ packet.ip.protocol = IPPROTO_UDP;
+ packet.ip.saddr = source_nip;
+ packet.ip.daddr = dest_nip;
+ packet.udp.source = htons(source_port);
+ packet.udp.dest = htons(dest_port);
+ /* size, excluding IP header: */
+ packet.udp.len = htons(UDP_DHCP_SIZE - padding);
+ /* for UDP checksumming, ip.len is set to UDP packet len */
+ packet.ip.tot_len = packet.udp.len;
+ packet.udp.check = inet_cksum((uint16_t *)&packet,
+ IP_UDP_DHCP_SIZE - padding);
+ /* but for sending, it is set to IP packet len */
+ packet.ip.tot_len = htons(IP_UDP_DHCP_SIZE - padding);
+ packet.ip.ihl = sizeof(packet.ip) >> 2;
+ packet.ip.version = IPVERSION;
+ packet.ip.ttl = IPDEFTTL;
+ packet.ip.check = inet_cksum((uint16_t *)&packet.ip, sizeof(packet.ip));
+
+ udhcp_dump_packet(dhcp_pkt);
+ result = sendto(fd, &packet, IP_UDP_DHCP_SIZE - padding, /*flags:*/ 0,
+ (struct sockaddr *) &dest_sll, sizeof(dest_sll));
+ msg = "sendto";
+ ret_close:
+ close(fd);
+ if (result < 0) {
+ ret_msg:
+ bb_perror_msg(msg, "PACKET");
+ }
+ return result;
+}
+
+/* Let the kernel do all the work for packet generation */
+int FAST_FUNC udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
+ uint32_t source_nip, int source_port,
+ uint32_t dest_nip, int dest_port)
+{
+ struct sockaddr_in sa;
+ unsigned padding;
+ int fd;
+ int result = -1;
+ const char *msg;
+
+ fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ if (fd < 0) {
+ msg = "socket(%s)";
+ goto ret_msg;
+ }
+ setsockopt_reuseaddr(fd);
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sin_family = AF_INET;
+ sa.sin_port = htons(source_port);
+ sa.sin_addr.s_addr = source_nip;
+ if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
+ msg = "bind(%s)";
+ goto ret_close;
+ }
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sin_family = AF_INET;
+ sa.sin_port = htons(dest_port);
+ sa.sin_addr.s_addr = dest_nip;
+ if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
+ msg = "connect";
+ goto ret_close;
+ }
+
+ udhcp_dump_packet(dhcp_pkt);
+ padding = DHCP_OPTIONS_BUFSIZE - 1 - udhcp_end_option(dhcp_pkt->options);
+ result = safe_write(fd, dhcp_pkt, DHCP_SIZE - padding);
+ msg = "write";
+ ret_close:
+ close(fd);
+ if (result < 0) {
+ ret_msg:
+ bb_perror_msg(msg, "UDP");
+ }
+ return result;
+}