[Qemu-devel] [PATCH] slirp: ensure minimum packet size

[Bruce Rogers]

With recent gpxe eepro100 drivers, short packets are rejected,
so ensure the minimum ethernet packet size.

Signed-off-by: Bruce Rogers <address@hidden>
---
 slirp/slirp.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/slirp/slirp.c b/slirp/slirp.c
index 332d83b..b611cf7 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -697,7 +697,7 @@ void if_encap(Slirp *slirp, const uint8_t *ip_data, int 
ip_data_len)
         return;
     
     if (!memcmp(slirp->client_ethaddr, zero_ethaddr, ETH_ALEN)) {
-        uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)];
+        uint8_t arp_req[max(ETH_HLEN + sizeof(struct arphdr), 64)];
         struct ethhdr *reh = (struct ethhdr *)arp_req;
         struct arphdr *rah = (struct arphdr *)(arp_req + ETH_HLEN);
         const struct ip *iph = (const struct ip *)ip_data;
@@ -734,7 +734,7 @@ void if_encap(Slirp *slirp, const uint8_t *ip_data, int 
ip_data_len)
         memcpy(&eh->h_source[2], &slirp->vhost_addr, 4);
         eh->h_proto = htons(ETH_P_IP);
         memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
-        slirp_output(slirp->opaque, buf, ip_data_len + ETH_HLEN);
+        slirp_output(slirp->opaque, buf, max(ip_data_len + ETH_HLEN, 64));
     }
 }
 
-- 
1.6.0.2