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authorMichal Sekletar <msekleta@redhat.com>2014-06-19 18:59:37 +0200
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-06-22 12:26:09 -0400
commit68328ed63ce3a938679caf41db64e068234a0ca8 (patch)
tree1adaded70eb83a4e8cf97e5e550d9eff736279b8
parent972bded03215d4602fdd2ed2d680350c8eacb056 (diff)
dhcp-network: don't bother with IP fragments
-rw-r--r--src/libsystemd-network/dhcp-network.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libsystemd-network/dhcp-network.c b/src/libsystemd-network/dhcp-network.c
index 0e37bea197..9d579177a4 100644
--- a/src/libsystemd-network/dhcp-network.c
+++ b/src/libsystemd-network/dhcp-network.c
@@ -41,6 +41,10 @@ int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link,
BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, ip.protocol)), /* A <- IP protocol */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 1, 0), /* IP protocol == UDP ? */
BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
+ BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(DHCPPacket, ip.frag_off)), /* A <- Flags + Fragment offset */
+ BPF_STMT(BPF_ALU + BPF_AND + BPF_K, 0x1fff), /* A <- A & 0x1fff */
+ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0, 1, 0), /* A == 0 ? */
+ BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(DHCPPacket, udp.dest)), /* A <- UDP destination port */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DHCP_PORT_CLIENT, 1, 0), /* UDP destination port == DHCP client port ? */
BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */