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From 148788eb0ee96026105755cf3fd1ad3d94f49cd2 Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Thu, 21 Jun 2018 17:36:22 +0200
Subject: [PATCH] udhcpc: remove code which requires server ID to be on local
network
This reverts "udhcpc: paranoia when using kernel UDP mode
for sending renew: server ID may be bogus".
Users complain that they do have servers behind routers
(with DHCP relays).
function old new delta
send_packet 168 166 -2
bcast_or_ucast 25 23 -2
udhcp_send_kernel_packet 301 295 -6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-10) Total: -10 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
networking/udhcp/common.h | 4 +---
networking/udhcp/d6_dhcpc.c | 4 +---
networking/udhcp/dhcpc.c | 10 ++--------
networking/udhcp/dhcpd.c | 4 +---
networking/udhcp/packet.c | 7 +++----
5 files changed, 8 insertions(+), 21 deletions(-)
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -308,9 +308,7 @@ int udhcp_send_raw_packet(struct dhcp_pa
int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
uint32_t source_nip, int source_port,
- uint32_t dest_nip, int dest_port,
- int send_flags
-) FAST_FUNC;
+ uint32_t dest_nip, int dest_port) FAST_FUNC;
void udhcp_sp_setup(void) FAST_FUNC;
void udhcp_sp_fd_set(struct pollfd *pfds, int extra_fd) FAST_FUNC;
--- a/networking/udhcp/d6_dhcpc.c
+++ b/networking/udhcp/d6_dhcpc.c
@@ -702,15 +702,13 @@ static NOINLINE int send_d6_renew(uint32
opt_ptr = add_d6_client_options(opt_ptr);
bb_error_msg("sending %s", "renew");
- if (server_ipv6) {
+ if (server_ipv6)
return d6_send_kernel_packet(
&packet, (opt_ptr - (uint8_t*) &packet),
our_cur_ipv6, CLIENT_PORT6,
server_ipv6, SERVER_PORT6,
client_config.ifindex
- /* TODO? send_flags: MSG_DONTROUTE (see IPv4 code for reason why) */
);
- }
return d6_mcast_from_client_config_ifindex(&packet, opt_ptr);
}
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -693,16 +693,10 @@ static int raw_bcast_from_client_config_
static int bcast_or_ucast(struct dhcp_packet *packet, uint32_t ciaddr, uint32_t server)
{
- if (server) {
- /* Without MSG_DONTROUTE, the packet was seen routed over
- * _other interface_ if server ID is bogus (example: 1.1.1.1).
- */
+ if (server)
return udhcp_send_kernel_packet(packet,
ciaddr, CLIENT_PORT,
- server, SERVER_PORT,
- /*send_flags: "to hosts only on directly connected networks" */ MSG_DONTROUTE
- );
- }
+ server, SERVER_PORT);
return raw_bcast_from_client_config_ifindex(packet, ciaddr);
}
--- a/networking/udhcp/dhcpd.c
+++ b/networking/udhcp/dhcpd.c
@@ -588,9 +588,7 @@ static void send_packet_to_relay(struct
udhcp_send_kernel_packet(dhcp_pkt,
server_config.server_nip, SERVER_PORT,
- dhcp_pkt->gateway_nip, SERVER_PORT,
- /*send_flags:*/ 0
- );
+ dhcp_pkt->gateway_nip, SERVER_PORT);
}
static void send_packet(struct dhcp_packet *dhcp_pkt, int force_broadcast)
--- a/networking/udhcp/packet.c
+++ b/networking/udhcp/packet.c
@@ -189,8 +189,7 @@ int FAST_FUNC udhcp_send_raw_packet(stru
/* 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,
- int send_flags)
+ uint32_t dest_nip, int dest_port)
{
struct sockaddr_in sa;
unsigned padding;
@@ -227,8 +226,8 @@ int FAST_FUNC udhcp_send_kernel_packet(s
padding = DHCP_OPTIONS_BUFSIZE - 1 - udhcp_end_option(dhcp_pkt->options);
if (padding > DHCP_SIZE - 300)
padding = DHCP_SIZE - 300;
- result = send(fd, dhcp_pkt, DHCP_SIZE - padding, send_flags);
- msg = "send";
+ result = safe_write(fd, dhcp_pkt, DHCP_SIZE - padding);
+ msg = "write";
ret_close:
close(fd);
if (result < 0) {
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