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authorDmitry Tejblum <tejblum@yandex-team.ru>2009-06-24 20:14:30 +0400
committerDenis Ovsienko <pilot@etcnet.org>2009-06-24 20:14:30 +0400
commitc9035ccd13078b6a5d53566979a66c1ac892b47a (patch)
treed144006c697fdf5aa06535cee1d89cdb9a359ec9 /ospfd
parent014b670e02cc1f38e8e4e786269fc1787412f9b7 (diff)
[ospfd] discount IP header size from a new LSA pkt
Diffstat (limited to 'ospfd')
-rw-r--r--ospfd/ospf_packet.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/ospfd/ospf_packet.c b/ospfd/ospf_packet.c
index 5f0d99da..7ebf114e 100644
--- a/ospfd/ospf_packet.c
+++ b/ospfd/ospf_packet.c
@@ -2869,7 +2869,7 @@ ospf_make_ls_upd (struct ospf_interface *oi, struct list *update, struct stream
{
struct ospf_lsa *lsa;
struct listnode *node;
- u_int16_t length = OSPF_LS_UPD_MIN_SIZE;
+ u_int16_t length = 0;
unsigned int size_noauth;
unsigned long delta = stream_get_endp (s);
unsigned long pp;
@@ -2880,6 +2880,7 @@ ospf_make_ls_upd (struct ospf_interface *oi, struct list *update, struct stream
pp = stream_get_endp (s);
stream_forward_endp (s, OSPF_LS_UPD_MIN_SIZE);
+ length += OSPF_LS_UPD_MIN_SIZE;
/* Calculate amount of packet usable for data. */
size_noauth = stream_get_size(s) - ospf_packet_authspace(oi);
@@ -3298,7 +3299,6 @@ ospf_ls_upd_packet_new (struct list *update, struct ospf_interface *oi)
else
size = oi->ifp->mtu;
- /* XXX Should this be - sizeof(struct ip)?? -gdt */
if (size > OSPF_MAX_PACKET_SIZE)
{
zlog_warn ("ospf_ls_upd_packet_new: oversized LSA id:%s too big,"
@@ -3310,7 +3310,16 @@ ospf_ls_upd_packet_new (struct list *update, struct ospf_interface *oi)
return NULL;
}
- return ospf_packet_new (size);
+ /* IP header is built up separately by ospf_write(). This means, that we must
+ * reduce the "affordable" size just calculated by length of an IP header.
+ * This makes sure, that even if we manage to fill the payload with LSA data
+ * completely, the final packet (our data plus IP header) still fits into
+ * outgoing interface MTU. This correction isn't really meaningful for an
+ * oversized LSA, but for consistency the correction is done for both cases.
+ *
+ * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
+ */
+ return ospf_packet_new (size - sizeof (struct ip));
}
static void