udhcpc: reduce stack usage by de-inlining routines with on-stack pkt buf

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

diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index f0c8ace2ddb890c404106c6c70212066517fbf05..7b679d10fe3000e7c93991df1a81db10130d32a5 100644 (file)
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -362,12 +362,6 @@ static void add_client_options(struct dhcp_packet *packet)
        int i, end, len;
 
        udhcp_add_simple_option(packet, DHCP_MAX_SIZE, htons(IP_UDP_DHCP_SIZE));
-       if (client_config.hostname)
-               udhcp_add_binary_option(packet, client_config.hostname);
-       if (client_config.fqdn)
-               udhcp_add_binary_option(packet, client_config.fqdn);
-       if (client_config.vendorclass)
-               udhcp_add_binary_option(packet, client_config.vendorclass);
 
        /* Add a "param req" option with the list of options we'd like to have
         * from stubborn DHCP servers. Pull the data from the struct in common.c.
@@ -390,6 +384,13 @@ static void add_client_options(struct dhcp_packet *packet)
                packet->options[end + OPT_DATA + len] = DHCP_END;
        }
 
+       if (client_config.vendorclass)
+               udhcp_add_binary_option(packet, client_config.vendorclass);
+       if (client_config.hostname)
+               udhcp_add_binary_option(packet, client_config.hostname);
+       if (client_config.fqdn)
+               udhcp_add_binary_option(packet, client_config.fqdn);
+
        /* Add -x options if any */
        {
                struct option_set *curr = client_config.options;
@@ -431,7 +432,7 @@ static int raw_bcast_from_client_config_ifindex(struct dhcp_packet *packet)
 }
 
 /* Broadcast a DHCP discover packet to the network, with an optionally requested IP */
-static int send_discover(uint32_t xid, uint32_t requested)
+static NOINLINE int send_discover(uint32_t xid, uint32_t requested)
 {
        struct dhcp_packet packet;
 
@@ -459,7 +460,7 @@ static int send_discover(uint32_t xid, uint32_t requested)
 /* RFC 2131 3.1 paragraph 3:
  * "The client _broadcasts_ a DHCPREQUEST message..."
  */
-static int send_select(uint32_t xid, uint32_t server, uint32_t requested)
+static NOINLINE int send_select(uint32_t xid, uint32_t server, uint32_t requested)
 {
        struct dhcp_packet packet;
        struct in_addr addr;
@@ -542,7 +543,7 @@ static int send_renew(uint32_t xid, uint32_t server, uint32_t ciaddr)
 
 #if ENABLE_FEATURE_UDHCPC_ARPING
 /* Broadcast a DHCP decline message */
-static int send_decline(uint32_t xid, uint32_t server, uint32_t requested)
+static NOINLINE int send_decline(uint32_t xid, uint32_t server, uint32_t requested)
 {
        struct dhcp_packet packet;
 
@@ -1356,7 +1357,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
                /* TODO: why we don't just fetch server's IP from IP header? */
                                temp = udhcp_get_option(&packet, DHCP_SERVER_ID);
                                if (!temp) {
-                                       bb_error_msg("no server ID in message");
+                                       bb_error_msg("no server ID, ignoring packet");
                                        continue;
                                        /* still selecting - this server looks bad */
                                }