net: dhcp: allow to set transmitted vendor id
For net boot setups it is useful to submit boot params like server or bootfile over dhcp. To distinguish barebox from e.g. pxe machines, a custom vendor id can be sent in dhcp discover/request messages. E.g. the ISC dhcp server can be configured with | if substring(option vendor-class-identifier,0,8) = "barebox:" { | next-server 192.168.3.24; | server-name "192.168.3.24"; | option tftp-server-name "192.168.3.24"; | option root-path = concat("/srv/sysroots/by-mac/", | binary-to-ascii (16, 8, "-", substring (hardware, 1, 6))); | } to sent boot params which are valid for barebox hosts only. Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de> Jean-Christophe PLAGNIOL-VILLARD: - update the use dhcp command option - support to set the vendor via env dhcp_vendor_id Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@ -9,6 +9,7 @@ machine=FIXME
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# use 'dhcp' to do dhcp in barebox and in kernel
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# use 'none' if you want to skip kernel ip autoconfiguration
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ip=dhcp
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dhcp_vendor_id=barebox
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# or set your networking parameters here
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#eth0.ipaddr=a.b.c.d
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42
net/dhcp.c
42
net/dhcp.c
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@ -17,6 +17,7 @@
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#include <errno.h>
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#include <magicvar.h>
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#include <linux/err.h>
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#include <getopt.h>
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#define OPT_SIZE 312 /* Minimum DHCP Options size per RFC2131 - results in 576 byte pkt */
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@ -127,10 +128,12 @@ static void bootp_copy_net_params(struct bootp *bp)
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/*
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* Initialize BOOTP extension fields in the request.
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*/
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static int dhcp_extended (u8 *e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
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static int dhcp_extended (u8 *e, int message_type, IPaddr_t ServerID,
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IPaddr_t RequestedIP, char *vendor_id)
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{
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u8 *start = e;
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u8 *cnt;
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int vendor_id_len = vendor_id ? strlen(vendor_id) : 0;
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*e++ = 99; /* RFC1048 Magic Cookie */
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*e++ = 130;
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@ -168,6 +171,13 @@ static int dhcp_extended (u8 *e, int message_type, IPaddr_t ServerID, IPaddr_t R
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*e++ = tmp & 0xff;
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}
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if (vendor_id_len > 0) {
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*e++ = 60;
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*e++ = vendor_id_len;
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memcpy(e, vendor_id, vendor_id_len);
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e += vendor_id_len;
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}
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*e++ = 55; /* Parameter Request List */
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cnt = e++; /* Pointer to count of requested items */
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*cnt = 0;
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@ -223,7 +233,8 @@ static int bootp_request(void)
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safe_strncpy (bp->bp_file, bfile, sizeof(bp->bp_file));
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/* Request additional information from the BOOTP/DHCP server */
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ext_len = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
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ext_len = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0,
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dhcp_con->priv);
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Bootp_id = (uint32_t)get_time_ns();
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net_copy_uint32(&bp->bp_id, &Bootp_id);
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@ -373,7 +384,8 @@ static void dhcp_send_request_packet(struct bootp *bp_offer)
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* Copy options from OFFER packet if present
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*/
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net_copy_ip(&OfferedIP, &bp->bp_yiaddr);
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extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST, net_dhcp_server_ip, OfferedIP);
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extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST, net_dhcp_server_ip,
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OfferedIP, dhcp_con->priv);
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debug("Transmitting DHCPREQUEST packet\n");
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net_udp_send(dhcp_con, sizeof(*bp) + extlen);
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@ -438,9 +450,18 @@ static void dhcp_handler(void *ctx, char *packet, unsigned int len)
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static int do_dhcp(int argc, char *argv[])
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{
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int ret;
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int ret, opt;
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char *vendor_id = (char*)getenv("dhcp_vendor_id");
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dhcp_con = net_udp_new(0xffffffff, PORT_BOOTPS, dhcp_handler, NULL);
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while((opt = getopt(argc, argv, "v:")) > 0) {
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switch(opt) {
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case 'v':
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vendor_id = optarg;
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break;
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}
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}
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dhcp_con = net_udp_new(0xffffffff, PORT_BOOTPS, dhcp_handler, vendor_id);
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if (IS_ERR(dhcp_con)) {
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ret = PTR_ERR(dhcp_con);
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goto out;
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@ -478,9 +499,19 @@ out:
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return ret ? 1 : 0;
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}
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BAREBOX_CMD_HELP_START(dhcp)
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BAREBOX_CMD_HELP_USAGE("dhcp [OPTIONS]\n")
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BAREBOX_CMD_HELP_SHORT("Invoke dhcp client to obtain ip/boot params.\n")
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BAREBOX_CMD_HELP_OPT ("-v <vendor_id>",
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"DHCP Vendor ID (code 60) submitted in DHCP requests. It can\n"
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"be used in the DHCP server's configuration to select options\n"
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"(e.g. bootfile or server) which are valid for barebox clients only.\n");
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BAREBOX_CMD_HELP_END
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BAREBOX_CMD_START(dhcp)
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.cmd = do_dhcp,
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.usage = "invoke dhcp client to obtain ip/boot params",
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BAREBOX_CMD_HELP(cmd_dhcp_help)
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BAREBOX_CMD_END
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BAREBOX_MAGICVAR(bootfile, "bootfile returned from DHCP request");
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@ -488,3 +519,4 @@ BAREBOX_MAGICVAR(nameserver, "Nameserver returned from DHCP request");
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BAREBOX_MAGICVAR(hostname, "hostname returned from DHCP request");
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BAREBOX_MAGICVAR(domainname, "domainname returned from DHCP request");
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BAREBOX_MAGICVAR(rootpath, "rootpath returned from DHCP request");
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BAREBOX_MAGICVAR(dhcp_vendor_id, "vendor id to send to the DHCP server");
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