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authorTom Gundersen <teg@jklm.no>2014-08-01 16:10:13 +0200
committerTom Gundersen <teg@jklm.no>2014-08-01 16:34:50 +0200
commit324f818781a250b60f2fcfa74ff1c9101d2d1315 (patch)
treefc3679fe7753eb884d3f75153138e44b0d3f736b /src/libsystemd-network/dhcp-protocol.h
parentc18126e8da7290725af9e3a86e25b2aefbc1ecae (diff)
sd-dhcp-client: allow the max dhcp message size to be set to the MTU of the link
Diffstat (limited to 'src/libsystemd-network/dhcp-protocol.h')
-rw-r--r--src/libsystemd-network/dhcp-protocol.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libsystemd-network/dhcp-protocol.h b/src/libsystemd-network/dhcp-protocol.h
index f5119a7a58..abca9422c5 100644
--- a/src/libsystemd-network/dhcp-protocol.h
+++ b/src/libsystemd-network/dhcp-protocol.h
@@ -60,7 +60,8 @@ typedef struct DHCPPacket DHCPPacket;
#define DHCP_IP_SIZE (int32_t)(sizeof(struct iphdr))
#define DHCP_IP_UDP_SIZE (int32_t)(sizeof(struct udphdr) + DHCP_IP_SIZE)
#define DHCP_MESSAGE_SIZE (int32_t)(sizeof(DHCPMessage))
-#define DHCP_MIN_OPTIONS_SIZE 308 /* spec says 312, but that includes the magic cookie */
+#define DHCP_DEFAULT_MIN_SIZE 576 /* the minimum internet hosts must be able to receive */
+#define DHCP_MIN_OPTIONS_SIZE DHCP_DEFAULT_MIN_SIZE - DHCP_IP_UDP_SIZE - DHCP_MESSAGE_SIZE
#define DHCP_MAGIC_COOKIE (uint32_t)(0x63825363)
enum {