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changeset 5028:c06163d3bc14 draft

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DHCP: Support jumbo frames Also important as we now need to store the frame header in the initial buffer.
author Roy Marples <roy@marples.name>
date Wed, 05 Feb 2020 14:05:51 +0000
parents cdf241b94d99
children f979cefdddcf
files src/dhcp.c src/if.h src/privsep-bpf.c
diffstat 3 files changed, 6 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/src/dhcp.c	Wed Feb 05 13:29:45 2020 +0000
+++ b/src/dhcp.c	Wed Feb 05 14:05:51 2020 +0000
@@ -3507,7 +3507,7 @@
 dhcp_readbpf(void *arg)
 {
 	struct interface *ifp = arg;
-	uint8_t buf[MTU_MAX];
+	uint8_t buf[FRAMELEN_MAX];
 	ssize_t bytes;
 	struct dhcp_state *state = D_STATE(ifp);
 	ssize_t fl = (ssize_t)bpf_frame_header_len(ifp);
--- a/src/if.h	Wed Feb 05 13:29:45 2020 +0000
+++ b/src/if.h	Wed Feb 05 14:05:51 2020 +0000
@@ -90,6 +90,10 @@
 #  define ARPHRD_INFINIBAND		32
 #endif
 
+/* Maximum frame length.
+ * Support jumbo frames and some extra. */
+#define	FRAMELEN_MAX			10240
+
 /* Work out if we have a private address or not
  * 10/8
  * 172.16/12
--- a/src/privsep-bpf.c	Wed Feb 05 13:29:45 2020 +0000
+++ b/src/privsep-bpf.c	Wed Feb 05 14:05:51 2020 +0000
@@ -59,7 +59,7 @@
 {
 	struct ps_process *psp = arg;
 	unsigned int flags;
-	uint8_t buf[MTU_MAX];
+	uint8_t buf[FRAMELEN_MAX];
 	ssize_t len;
 	struct ps_msghdr psm = {
 		.ps_id = psp->psp_id,