If CONFIG_BOOTP_OPTIONS is defined at compile-time, the environment will be checked for the supported DHCPv4 client options during construction of a "DHCP Discover" or "DHCP Request" packet. Any found (as listed below, prefixed with dhcp_) will have their value included in the dhcp packet.
dhcp_vendor-class-identifier dhcp_user-class dhcp_dhcp-client-identifier
Signed-off-by: Gray Remlin g_remlin@rocketmail.com --- v2: Remove redundant return value from dhcp_options_prep function Change dhcp_options_prep function return type to static void Correct grammatical error in README
README | 7 +++++++ common/cmd_nvedit.c | 3 +++ net/bootp.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ tools/env/fw_env.c | 4 +++- 4 files changed, 64 insertions(+), 1 deletions(-)
diff --git a/README b/README index a52f3bf..cd892cc 100644 --- a/README +++ b/README @@ -1279,6 +1279,7 @@ The following options need to be configured: CONFIG_BOOTP_NTPSERVER CONFIG_BOOTP_TIMEOFFSET CONFIG_BOOTP_VENDOREX + CONFIG_BOOTP_OPTIONS
CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip environment variable, not the BOOTP server. @@ -1299,6 +1300,12 @@ The following options need to be configured: of the "hostname" environment variable is passed as option 12 to the DHCP server.
+ CONFIG_BOOTP_OPTIONS - The environment is checked for the + supported DHCPv4 client options (prefixed with dhcp_), any + found are sent during a "DHCP Discover" and "DHCP Request". + The DHCP server can use this information to conditionally + tailor its response. + CONFIG_BOOTP_DHCP_REQUEST_DELAY
A 32bit value in microseconds for a delay between diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c index 3d30c32..2094e8e 100644 --- a/common/cmd_nvedit.c +++ b/common/cmd_nvedit.c @@ -224,6 +224,9 @@ int _do_env_set (int flag, int argc, char * const argv[]) if (ep) { /* variable exists */ #ifndef CONFIG_ENV_OVERWRITE if ((strcmp (name, "serial#") == 0) || +#if defined(CONFIG_BOOTP_OPTIONS) + (strcmp(name, "dhcp_vendor-class-identifier") == 0) || +#endif /* CONFIG_BOOTP_OPTIONS */ ((strcmp (name, "ethaddr") == 0) #if defined(CONFIG_OVERWRITE_ETHADDR_ONCE) && defined(CONFIG_ETHADDR) && (strcmp (ep->data,MK_STR(CONFIG_ETHADDR)) != 0) diff --git a/net/bootp.c b/net/bootp.c index 1289e3b..61ecede 100644 --- a/net/bootp.c +++ b/net/bootp.c @@ -68,6 +68,53 @@ extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */ extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL */ #endif
+#if defined(CONFIG_BOOTP_OPTIONS) /* check environment for dhcp client options */ + +/* + * The vendor-specifiable options should not be changeable + * unless CONFIG_ENV_OVERWRITE has been defined, however + * user-specifiable options should be changeable regardless + */ +static void dhcp_options_prep(u8 **ep) +{ + u8 *e = *ep; + char *ptr; + + debug("DHCP Client options start\n"); + + /* vendor-specifiable identification string */ + if ((ptr = getenv("dhcp_vendor-class-identifier"))) { + debug("dhcp_vendor-class-identifier=%s\n",ptr); + *e++ = 60; + *e++ = strlen(ptr); + while (*ptr) + *e++ = *ptr++; + } + + /* user-specifiable identification string */ + if ((ptr = getenv("dhcp_dhcp-client-identifier"))) { + debug("dhcp_dhcp-client-identifier=%s\n",ptr); + *e++ = 61; + *e++ = strlen(ptr); + while (*ptr) + *e++ = *ptr++; + } + + /* user-specifiable identification string */ + if ((ptr = getenv("dhcp_user-class"))) { + debug("dhcp_user-class=%s\n",ptr); + *e++ = 77; + *e++ = strlen(ptr); + while (*ptr) + *e++ = *ptr++; + } + + *ep = e; + debug("DHCP Client options end\n"); +} + +#endif /* CONFIG_BOOTP_OPTIONS */ + #endif
static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) @@ -412,6 +459,10 @@ static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t R } #endif
+#if defined(CONFIG_BOOTP_OPTIONS) + dhcp_options_prep (&e); +#endif + #if defined(CONFIG_BOOTP_VENDOREX) if ((x = dhcp_vendorex_prep (e))) return x - start; diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c index 8ff7052..ae37d15 100644 --- a/tools/env/fw_env.c +++ b/tools/env/fw_env.c @@ -391,9 +391,11 @@ int fw_env_write(char *name, char *value) */ if (oldval) { /* - * Ethernet Address and serial# can be set only once + * Ethernet Address, vendor DHCP options, + * and serial# can be set only once */ if ((strcmp (name, "ethaddr") == 0) || + (strcmp(name, "dhcp_vendor-class-identifier") == 0) || (strcmp (name, "serial#") == 0)) { fprintf (stderr, "Can't overwrite "%s"\n", name); errno = EROFS; --