From: Umut Tezduyar Lindskog <umut.tezduyar@axis.com>
Date: Sun, 30 Mar 2014 17:09:14 +0000 (+0200)
Subject: sd-dhcp: check for udp packets
X-Git-Tag: v213~504
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=d454a6748c34f0f67eef618238e0a64b80c85303

sd-dhcp: check for udp packets

Do not try to parse ICMP packets

[tomegun: slightly tweaked debug message]
---

diff --git a/src/libsystemd-network/dhcp-packet.c b/src/libsystemd-network/dhcp-packet.c
index bed942fd8..9779cbd51 100644
--- a/src/libsystemd-network/dhcp-packet.c
+++ b/src/libsystemd-network/dhcp-packet.c
@@ -157,6 +157,11 @@ int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum) {
 
         /* UDP */
 
+        if (packet->ip.protocol != IPPROTO_UDP) {
+                log_dhcp_client(client, "ignoring packet: not UDP");
+                return -EINVAL;
+        }
+
         if (len < DHCP_IP_UDP_SIZE) {
                 log_dhcp_client(client, "ignoring packet: packet (%zu bytes) "
                                 " smaller than IP+UDP header (%u bytes)", len,