diff options
Diffstat (limited to 'isisd/isis_flex_algo.c')
| -rw-r--r-- | isisd/isis_flex_algo.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/isisd/isis_flex_algo.c b/isisd/isis_flex_algo.c index 94ad53b22..742a862fc 100644 --- a/isisd/isis_flex_algo.c +++ b/isisd/isis_flex_algo.c @@ -237,4 +237,100 @@ bool sr_algorithm_participated(const struct isis_lsp *lsp, uint8_t algorithm) return false; } +bool isis_flex_algo_constraint_drop(struct isis_spftree *spftree, + struct isis_lsp *lsp, + struct isis_extended_reach *reach) +{ + bool ret; + struct isis_ext_subtlvs *subtlvs = reach->subtlvs; + uint8_t lspid_orig[ISIS_SYS_ID_LEN + 2]; + uint8_t lspid_neigh[ISIS_SYS_ID_LEN + 2]; + struct isis_router_cap_fad *fad; + struct isis_asla_subtlvs *asla; + struct listnode *node; + uint32_t *link_admin_group = NULL; + uint32_t link_ext_admin_group_bitmap0; + struct admin_group *link_ext_admin_group = NULL; + + fad = isis_flex_algo_elected_supported(spftree->algorithm, + spftree->area); + if (!fad) + return true; + + for (ALL_LIST_ELEMENTS_RO(subtlvs->aslas, node, asla)) { + if (!CHECK_FLAG(asla->standard_apps, ISIS_SABM_FLAG_X)) + continue; + if (asla->legacy) { + if (IS_SUBTLV(subtlvs, EXT_ADM_GRP)) + link_admin_group = &subtlvs->adm_group; + + if (IS_SUBTLV(subtlvs, EXT_EXTEND_ADM_GRP) && + admin_group_nb_words(&subtlvs->ext_admin_group) != + 0) + link_ext_admin_group = + &subtlvs->ext_admin_group; + } else { + if (IS_SUBTLV(asla, EXT_ADM_GRP)) + link_admin_group = &asla->admin_group; + if (IS_SUBTLV(asla, EXT_EXTEND_ADM_GRP) && + admin_group_nb_words(&asla->ext_admin_group) != 0) + link_ext_admin_group = &asla->ext_admin_group; + } + break; + } + + /* RFC7308 section 2.3.1 + * A receiving node that notices that the AG differs from the first 32 + * bits of the EAG SHOULD report this mismatch to the operator. + */ + if (link_admin_group && link_ext_admin_group) { + link_ext_admin_group_bitmap0 = + admin_group_get_offset(link_ext_admin_group, 0); + if (*link_admin_group != link_ext_admin_group_bitmap0) { + memcpy(lspid_orig, lsp->hdr.lsp_id, + ISIS_SYS_ID_LEN + 2); + memcpy(lspid_neigh, reach->id, ISIS_SYS_ID_LEN + 2); + zlog_warn( + "ISIS-SPF: LSP from %pLS neighbor %pLS. Admin-group 0x%08x differs from ext admin-group 0x%08x.", + lspid_orig, lspid_neigh, *link_admin_group, + link_ext_admin_group_bitmap0); + } + } + + /* + * Exclude Any + */ + if (!admin_group_zero(&fad->fad.admin_group_exclude_any)) { + ret = admin_group_match_any(&fad->fad.admin_group_exclude_any, + link_admin_group, + link_ext_admin_group); + if (ret) + return true; + } + + /* + * Include Any + */ + if (!admin_group_zero(&fad->fad.admin_group_include_any)) { + ret = admin_group_match_any(&fad->fad.admin_group_include_any, + link_admin_group, + link_ext_admin_group); + if (!ret) + return true; + } + + /* + * Include All + */ + if (!admin_group_zero(&fad->fad.admin_group_include_all)) { + ret = admin_group_match_all(&fad->fad.admin_group_include_all, + link_admin_group, + link_ext_admin_group); + if (!ret) + return true; + } + + return false; +} + #endif /* ifndef FABRICD */ |