fortify packet reception in ospfd

• VU#551715
  • CVE-2012-0249
  • CVE-2012-0250
• BZ#705

round 1 (in 0.99.17.7)

RE-stable-0.99 RE-testing-0.99 summary
************** *************** *******
4ddd8f7        95f09bb         ospfd: use LOOKUP() for ospf_packet_type_str
97ac75a        dad9b68         ospfd: fix ospf_packet_add_top() to use LOOKUP()
2f67455        e4e3f3e         ospfd: introduce ospf_packet_minlen[] (BZ#705)
22ce6f6        72ba2f5         ospfd: review ospf_check_auth()
b3ebd09        0dc0752         ospfd: review ospf_check_md5_digest()
83face4        c2397dc         ospfd: introduce ospf_lsa_minlen[] (BZ#705)
ad101ea        8c0ac03         ospfd: fix packet length check for auth/LLS cases
311b7bc        0586be6         ospfd: introduce ospf_auth_type_str[]
72b24a8        8824a0b         ospfd: bring ospf_check_auth() into focus
f262d1f        f66557b         ospfd: reduce ospf_verify_header()

round 2 (in 0.99.17.9)

RE-stable-0.99 RE-testing-0.99 summary
************** *************** *******
1b4bf5f        2d3e4e3         ospfd: adjust OSPF_ROUTER_LSA_MIN_SIZE for VL case