site: Negotiate (configurable) MTU

[secnet.git] / netlink.c

diff --git a/netlink.c b/netlink.c
index 55eef5c8da38ce6139dc60e9e3d6d746f5919050..372645615a3af5bc223a5582d5c953515148da4c 100644 (file)
--- a/netlink.c
+++ b/netlink.c
@@ -775,9 +775,12 @@ static void netlink_packet_local(struct netlink *st,
     }
     h=(struct icmphdr *)buf->start;
 
-    if ((ntohs(h->iph.frag)&(IPHDR_FRAG_OFF|IPHDR_FRAG_MORE))!=0) {
-       Message(M_WARNING,"%s: fragmented packet addressed to secnet; "
-               "ignoring it\n",st->name);
+    unsigned fraginfo = ntohs(h->iph.frag);
+    if ((fraginfo&(IPHDR_FRAG_OFF|IPHDR_FRAG_MORE))!=0) {
+       if (!(fraginfo & IPHDR_FRAG_OFF))
+           /* report only for first fragment */
+           Message(M_WARNING,"%s: fragmented packet addressed to secnet; "
+                   "ignoring it\n",st->name);
        BUF_FREE(buf);
        return;
     }
@@ -828,7 +831,7 @@ static void netlink_incoming(struct netlink *st, struct netlink_client *client,
        BUF_FREE(buf);
        return;
     }
-    assert(buf->size >= (int)sizeof(struct icmphdr));
+    assert(buf->size >= (int)sizeof(struct iphdr));
     iph=(struct iphdr *)buf->start;
 
     source=ntohl(iph->saddr);
@@ -1025,12 +1028,16 @@ static void netlink_inst_set_mtu(void *sst, int32_t new_mtu)
 }
 
 static void netlink_inst_reg(void *sst, netlink_deliver_fn *deliver, 
-                            void *dst)
+                            void *dst, uint32_t *localmtu_r)
 {
     struct netlink_client *c=sst;
+    struct netlink *st=c->nst;
 
     c->deliver=deliver;
     c->dst=dst;
+
+    if (localmtu_r)
+       *localmtu_r=st->mtu;
 }
 
 static struct flagstr netlink_option_table[]={