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dea6bb4899
Prior to this patch, BIRD validates the OSPF LSA checksum by calculating a new checksum and comparing it with the checksum in the header. Due to the specifics of the Fletcher checksum used in OSPF, this is not necessarily correct as the checkbytes in the header may be calculated via a different means and end up with a different value that is nonetheless still correct. The documented means of validating the checksum as specified in RFC 905 B.4 is to calculate c0 and c1 from the unchanged contents of the packet, which must result in a zero value to be considered valid. Thanks to Chris Boot for the patch.
64 lines
2.7 KiB
C
64 lines
2.7 KiB
C
/*
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* BIRD -- OSPF
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*
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* (c) 1999--2000 Ondrej Filip <feela@network.cz>
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* (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org>
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* (c) 2009--2014 CZ.NIC z.s.p.o.
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_OSPF_LSALIB_H_
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#define _BIRD_OSPF_LSALIB_H_
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#ifdef CPU_BIG_ENDIAN
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static inline void lsa_hton_hdr(struct ospf_lsa_header *h, struct ospf_lsa_header *n) { *n = *h; };
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static inline void lsa_ntoh_hdr(struct ospf_lsa_header *n, struct ospf_lsa_header *h) { *h = *n; };
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static inline void lsa_hton_body(void *h, void *n, u16 len) { ASSERT(h != n); memcpy(n, h, len); };
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static inline void lsa_ntoh_body(void *n, void *h, u16 len) { ASSERT(n != h); memcpy(h, n, len); };
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static inline void lsa_hton_body1(void *h, u16 len) { };
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static inline void lsa_ntoh_body1(void *n, u16 len) { };
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#else
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void lsa_hton_hdr(struct ospf_lsa_header *h, struct ospf_lsa_header *n);
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void lsa_ntoh_hdr(struct ospf_lsa_header *n, struct ospf_lsa_header *h);
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void lsa_hton_body(void *h, void *n, u16 len);
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void lsa_ntoh_body(void *n, void *h, u16 len);
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static inline void lsa_hton_body1(void *h, u16 len) { lsa_hton_body(h, h, len); };
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static inline void lsa_ntoh_body1(void *n, u16 len) { lsa_ntoh_body(n, n, len); };
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#endif
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struct ospf_lsa_rt_walk {
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struct top_hash_entry *en;
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void *buf, *bufend;
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int ospf2;
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u16 type, metric;
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u32 id, data, lif, nif;
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};
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void lsa_get_type_domain_(u32 itype, struct ospf_iface *ifa, u32 *otype, u32 *domain);
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static inline void lsa_get_type_domain(struct ospf_lsa_header *lsa, struct ospf_iface *ifa, u32 *otype, u32 *domain)
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{ lsa_get_type_domain_(lsa->type_raw, ifa, otype, domain); }
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static inline u32 lsa_get_etype(struct ospf_lsa_header *h, struct ospf_proto *p)
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{ return ospf_is_v2(p) ? (h->type_raw & LSA_T_V2_MASK) : h->type_raw; }
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int lsa_flooding_allowed(u32 type, u32 domain, struct ospf_iface *ifa);
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void lsasum_calculate(struct ospf_lsa_header *header, void *body);
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u16 lsasum_check(struct ospf_lsa_header *h, void *body, int update);
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#define CMP_NEWER 1
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#define CMP_SAME 0
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#define CMP_OLDER -1
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int lsa_comp(struct ospf_lsa_header *l1, struct ospf_lsa_header *l2);
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void lsa_walk_rt_init(struct ospf_proto *po, struct top_hash_entry *act, struct ospf_lsa_rt_walk *rt);
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int lsa_walk_rt(struct ospf_lsa_rt_walk *rt);
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void lsa_parse_sum_net(struct top_hash_entry *en, int ospf2, ip_addr *ip, int *pxlen, u8 *pxopts, u32 *metric);
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void lsa_parse_sum_rt(struct top_hash_entry *en, int ospf2, u32 *drid, u32 *metric, u32 *options);
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void lsa_parse_ext(struct top_hash_entry *en, int ospf2, struct ospf_lsa_ext_local *rt);
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int lsa_validate(struct ospf_lsa_header *lsa, u32 lsa_type, int ospf2, void *body);
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#endif /* _BIRD_OSPF_LSALIB_H_ */
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