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eigrpd: Fix crash and attempt to send data
This code fixes a crash in EIGRP when on initial neighbor formation we need to send more than 1 packet of data to the nbr. I was testing this by redistributing connected and just adding a bunch of /32 address to an interface. Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp
parent
5da387853b
commit
7ecf0a4d37
@ -886,6 +886,7 @@ void eigrp_packet_header_init(int type, struct eigrp_interface *ei,
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{
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struct eigrp_header *eigrph;
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stream_reset(s);
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eigrph = (struct eigrp_header *)STREAM_DATA(s);
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eigrph->version = (u_char)EIGRP_HEADER_VERSION;
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@ -504,10 +504,36 @@ void eigrp_update_send_init(struct eigrp_neighbor *nbr)
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}
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}
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static void eigrp_update_place_on_nbr_queue(struct eigrp_neighbor *nbr,
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struct eigrp_packet *ep,
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u_int32_t seq_no,
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int length)
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{
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if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) &&
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(IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL)) {
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eigrp_make_md5_digest(nbr->ei,ep->s, EIGRP_AUTH_UPDATE_FLAG);
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}
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/* EIGRP Checksum */
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eigrp_packet_checksum(nbr->ei, ep->s, length);
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ep->length = length;
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ep->dst.s_addr = nbr->src.s_addr;
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/*This ack number we await from neighbor*/
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ep->sequence_number = seq_no;
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if (IS_DEBUG_EIGRP_PACKET(0, RECV))
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zlog_debug("Enqueuing Update Init Len [%u] Seq [%u] Dest [%s]",
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ep->length, ep->sequence_number, inet_ntoa(ep->dst));
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/*Put packet to retransmission queue*/
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eigrp_fifo_push_head(nbr->retrans_queue, ep);
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}
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void eigrp_update_send_EOT(struct eigrp_neighbor *nbr)
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{
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struct eigrp_packet *ep;
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// struct eigrp_packet *ep_multicast;
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u_int16_t length = EIGRP_HEADER_LEN;
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struct eigrp_neighbor_entry *te;
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struct eigrp_prefix_entry *pe;
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@ -518,38 +544,53 @@ void eigrp_update_send_EOT(struct eigrp_neighbor *nbr)
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struct prefix_list *plist_i;
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struct eigrp *e;
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struct prefix_ipv4 *dest_addr;
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u_int32_t seq_no = nbr->ei->eigrp->sequence_number;
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ep = eigrp_packet_new(nbr->ei->ifp->mtu);
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/* Prepare EIGRP EOT UPDATE header */
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eigrp_packet_header_init(
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EIGRP_OPC_UPDATE, nbr->ei, ep->s, EIGRP_EOT_FLAG,
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nbr->ei->eigrp->sequence_number, nbr->recv_sequence_number);
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eigrp_packet_header_init(EIGRP_OPC_UPDATE, nbr->ei, ep->s, EIGRP_EOT_FLAG,
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seq_no,
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nbr->recv_sequence_number);
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// encode Authentication TLV, if needed
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if ((IF_DEF_PARAMS(nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5)
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&& (IF_DEF_PARAMS(nbr->ei->ifp)->auth_keychain != NULL)) {
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length += eigrp_add_authTLV_MD5_to_stream(ep->s, nbr->ei);
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if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) &&
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(IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL)) {
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length += eigrp_add_authTLV_MD5_to_stream(ep->s,nbr->ei);
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}
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for (ALL_LIST_ELEMENTS(nbr->ei->eigrp->topology_table, node, nnode,
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pe)) {
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for (ALL_LIST_ELEMENTS(nbr->ei->eigrp->topology_table, node, nnode, pe)) {
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for (ALL_LIST_ELEMENTS(pe->entries, node2, nnode2, te)) {
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if ((te->ei == nbr->ei)
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&& (te->prefix->nt == EIGRP_TOPOLOGY_TYPE_REMOTE))
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continue;
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if ((length + 0x001D) > (u_int16_t)nbr->ei->ifp->mtu) {
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eigrp_update_place_on_nbr_queue (nbr, ep, seq_no, length);
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eigrp_send_packet_reliably(nbr);
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seq_no++;
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length = EIGRP_HEADER_LEN;
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ep = eigrp_packet_new(nbr->ei->ifp->mtu);
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eigrp_packet_header_init(EIGRP_OPC_UPDATE, nbr->ei, ep->s, EIGRP_EOT_FLAG,
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seq_no, nbr->recv_sequence_number);
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if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) &&
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(IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL))
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{
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length += eigrp_add_authTLV_MD5_to_stream(ep->s,nbr->ei);
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}
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}
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/* Get destination address from prefix */
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dest_addr = pe->destination_ipv4;
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/*
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* Filtering
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*/
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// TODO: Work in progress
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//TODO: Work in progress
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/* get list from eigrp process */
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e = eigrp_lookup();
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/* Get access-lists and prefix-lists from process and
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* interface */
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/* Get access-lists and prefix-lists from process and interface */
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alist = e->list[EIGRP_FILTER_OUT];
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plist = e->prefix[EIGRP_FILTER_OUT];
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alist_i = nbr->ei->list[EIGRP_FILTER_OUT];
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@ -557,65 +598,24 @@ void eigrp_update_send_EOT(struct eigrp_neighbor *nbr)
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/* Check if any list fits */
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if ((alist
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&& access_list_apply(alist,
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(struct prefix *)dest_addr)
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== FILTER_DENY)
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|| (plist
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&& prefix_list_apply(plist,
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(struct prefix *)dest_addr)
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== PREFIX_DENY)
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|| (alist_i
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&& access_list_apply(alist_i,
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(struct prefix *)dest_addr)
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== FILTER_DENY)
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|| (plist_i
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&& prefix_list_apply(plist_i,
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(struct prefix *)dest_addr)
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== PREFIX_DENY)) {
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zlog_info("PROC OUT EOT: Skipping");
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// pe->reported_metric.delay = EIGRP_MAX_METRIC;
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zlog_info("PROC OUT EOT Prefix: %s",
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inet_ntoa(dest_addr->prefix));
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&& access_list_apply (alist,
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(struct prefix *) dest_addr) == FILTER_DENY)||
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(plist && prefix_list_apply (plist,
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(struct prefix *) dest_addr) == PREFIX_DENY)||
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(alist_i && access_list_apply (alist_i,
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(struct prefix *) dest_addr) == FILTER_DENY)||
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(plist_i && prefix_list_apply (plist_i,
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(struct prefix *) dest_addr) == PREFIX_DENY)) {
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//pe->reported_metric.delay = EIGRP_MAX_METRIC;
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continue;
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} else {
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zlog_info(
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"PROC OUT EOT: NENastavujem metriku ");
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length += eigrp_add_internalTLV_to_stream(ep->s,
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pe);
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length += eigrp_add_internalTLV_to_stream(ep->s, pe);
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}
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/*
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* End of filtering
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*/
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/* NULL the pointer */
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dest_addr = NULL;
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}
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}
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if ((IF_DEF_PARAMS(nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5)
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&& (IF_DEF_PARAMS(nbr->ei->ifp)->auth_keychain != NULL)) {
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eigrp_make_md5_digest(nbr->ei, ep->s, EIGRP_AUTH_UPDATE_FLAG);
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}
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/* EIGRP Checksum */
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eigrp_packet_checksum(nbr->ei, ep->s, length);
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ep->length = length;
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ep->dst.s_addr = nbr->src.s_addr;
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/*This ack number we await from neighbor*/
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ep->sequence_number = nbr->ei->eigrp->sequence_number;
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if (IS_DEBUG_EIGRP_PACKET(0, RECV))
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zlog_debug("Enqueuing Update Init Len [%u] Seq [%u] Dest [%s]",
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ep->length, ep->sequence_number, inet_ntoa(ep->dst));
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/*Put packet to retransmission queue*/
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eigrp_fifo_push_head(nbr->retrans_queue, ep);
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if (nbr->retrans_queue->count == 1) {
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eigrp_send_packet_reliably(nbr);
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}
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eigrp_update_place_on_nbr_queue (nbr, ep, seq_no, length);
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eigrp_send_packet_reliably(nbr);
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}
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void eigrp_update_send(struct eigrp_interface *ei)
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