---
src/libsystemd-network/dhcp-network.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/libsystemd-network/dhcp-network.c
b/src/libsystemd-network/dhcp-network.c
index e5fd6a8..f500bff 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 */
--
2.0.0
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