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Merge commit '38195ac6' into thread-merge-2.16
This commit is contained in:
Maria Matejka
commit
c1ad3e58c0
@ -965,7 +965,7 @@ term:
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| ROA_CHECK '(' rtable ')' { $$ = f_implicit_roa_check($3); }
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| ROA_CHECK '(' rtable ',' term ',' term ')' { $$ = f_new_inst(FI_ROA_CHECK, $5, $7, $3); }
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| ASPA_CHECK '(' rtable ',' term ')' { $$ = f_new_inst(FI_ASPA_CHECK_EXPLICIT, $5, $3); }
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| ASPA_CHECK '(' rtable ',' term ',' term ')' { $$ = f_new_inst(FI_ASPA_CHECK_EXPLICIT, $5, $7, $3); }
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| FORMAT '(' term ')' { $$ = f_new_inst(FI_FORMAT, $3); }
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@ -1522,10 +1522,11 @@
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}
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INST(FI_ASPA_CHECK_EXPLICIT, 1, 1) { /* ASPA Check */
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INST(FI_ASPA_CHECK_EXPLICIT, 2, 1) { /* ASPA Check */
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NEVER_CONSTANT;
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ARG(1, T_PATH);
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RTC(2);
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ARG(2, T_BOOL);
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RTC(3);
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rtable *table = rtc->table;
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if (!table)
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@ -1534,7 +1535,7 @@
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if (table->addr_type != NET_ASPA)
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runtime("Table type must be ASPA");
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RESULT(T_ENUM_ASPA, i, [[ aspa_check(table, v1.val.ad) ]]);
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RESULT(T_ENUM_ASPA, i, [[ aspa_check(table, v1.val.ad, v2.val.i) ]]);
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}
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INST(FI_FROM_HEX, 1, 1) { /* Convert hex text to bytestring */
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@ -2414,7 +2414,56 @@ prefix pfx;
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bt_test_suite(t_roa_check, "Testing ROA");
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aspa table at;
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protocol static
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{
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aspa { table at; };
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route aspa 65540 provider 65544;
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route aspa 65541 provider 65545;
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route aspa 65542 provider 65544, 65545;
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route aspa 65543 provider 65544, 65545;
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route aspa 65544 transit;
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route aspa 65545 transit;
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route aspa 65550 provider 65540;
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route aspa 65551 provider 65543;
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}
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function t_aspa_check()
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{
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bgppath p1 = +empty+;
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p1.prepend(65540);
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p1.prepend(65544);
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bt_assert(aspa_check(at, p1, false) = ASPA_VALID);
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bt_assert(aspa_check(at, p1, true) = ASPA_VALID);
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p1.prepend(65542);
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bt_assert(aspa_check(at, p1, false) = ASPA_VALID);
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bt_assert(aspa_check(at, p1, true) = ASPA_INVALID_LEAK);
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p1.prepend(65555);
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bt_assert(aspa_check(at, p1, false) = ASPA_UNKNOWN);
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bt_assert(aspa_check(at, p1, true) = ASPA_INVALID_LEAK);
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bgppath p2 = +empty+;
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p2.prepend(65554);
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p2.prepend(65541);
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p2.prepend(65545);
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bt_assert(aspa_check(at, p2, false) = ASPA_UNKNOWN);
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bt_assert(aspa_check(at, p2, true) = ASPA_UNKNOWN);
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p2.prepend(65543);
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bt_assert(aspa_check(at, p2, false) = ASPA_UNKNOWN);
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bt_assert(aspa_check(at, p2, true) = ASPA_INVALID_LEAK);
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bgppath p3 = +empty+;
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p3.prepend(65541);
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p3.prepend(65544);
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bt_assert(aspa_check(at, p3, false) = ASPA_INVALID_LEAK);
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bt_assert(aspa_check(at, p3, true) = ASPA_INVALID_LEAK);
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}
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bt_test_suite(t_aspa_check, "Testing ASPA");
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filter vpn_filter
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{
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@ -214,9 +214,6 @@ extern const u16 net_max_text_length[];
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#define NET_ADDR_ASPA(asn) \
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((net_addr_aspa) { NET_ASPA, 32, sizeof(net_addr_aspa), asn })
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#define NET_ADDR_ASPA_EXISTS(asn) NET_ADDR_ASPA(asn, asn)
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#define NET_ADDR_ASPA_TRANSIT(asn) NET_ADDR_ASPA(asn, 0)
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#define NET_ADDR_MPLS(label) \
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((net_addr_mpls) { NET_MPLS, 20, sizeof(net_addr_mpls), label })
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@ -177,7 +177,7 @@ CF_ENUM(T_ENUM_RTS, RTS_, STATIC, INHERIT, DEVICE, STATIC_DEVICE, REDIRECT,
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CF_ENUM(T_ENUM_SCOPE, SCOPE_, HOST, LINK, SITE, ORGANIZATION, UNIVERSE, UNDEFINED)
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CF_ENUM(T_ENUM_RTD, RTD_, UNICAST, BLACKHOLE, UNREACHABLE, PROHIBIT)
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CF_ENUM(T_ENUM_ROA, ROA_, UNKNOWN, VALID, INVALID)
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CF_ENUM(T_ENUM_ASPA, ASPA_, UNKNOWN, VALID, INVALID)
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CF_ENUM(T_ENUM_ASPA, ASPA_, UNKNOWN, VALID, INVALID_EMPTY, INVALID_LEAK, INVALID_CONFED)
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CF_ENUM_PX(T_ENUM_AF, AF_, AFI_, IPV4, IPV6)
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CF_ENUM(T_ENUM_MPLS_POLICY, MPLS_POLICY_, NONE, STATIC, PREFIX, AGGREGATE, VRF)
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13
nest/route.h
13
nest/route.h
@ -929,12 +929,15 @@ void ea_show_nexthop_list(struct cli *c, struct nexthop_adata *nhad);
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#define ROA_VALID 1
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#define ROA_INVALID 2
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#define ASPA_UNKNOWN 0
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#define ASPA_VALID 1
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#define ASPA_INVALID 2
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#define ASPA_CONTAINS_CONFED 3
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enum aspa_result {
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ASPA_UNKNOWN = 0,
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ASPA_VALID,
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ASPA_INVALID_EMPTY,
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ASPA_INVALID_CONFED,
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ASPA_INVALID_LEAK,
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};
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int net_roa_check(rtable *tab, const net_addr *n, u32 asn);
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int aspa_check(rtable *tab, const struct adata *path);
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enum aspa_result aspa_check(rtable *tab, const struct adata *path, bool force_upstream);
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#endif
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116
nest/rt-table.c
116
nest/rt-table.c
@ -724,51 +724,45 @@ net_roa_check(rtable *tp, const net_addr *n, u32 asn)
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*
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* Implements draft-ietf-sidrops-aspa-verification-16.
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*/
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int aspa_check(rtable *tab, const adata *path)
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enum aspa_result aspa_check(rtable *tab, const adata *path, bool force_upstream)
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{
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/* Restore tmp linpool state after this check */
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CLEANUP(lp_saved_cleanup) struct lp_state *_lps = lp_save(tmp_linpool);
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/* No support for confed paths */
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if (as_path_contains_confed(path))
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return ASPA_CONTAINS_CONFED;
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return ASPA_INVALID_CONFED;
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/* Check path length */
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uint len = as_path_getlen(path);
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if (len == 0)
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return ASPA_INVALID_EMPTY;
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/* Normalize the AS Path: drop stuffings */
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uint len = as_path_getlen(path);
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u32 *asns = alloca(sizeof(u32) * len);
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uint ppos = 0;
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int nsz = 0;
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uint nsz = 0;
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while (as_path_walk(path, &ppos, &asns[nsz]))
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if ((nsz == 0) || (asns[nsz] != asns[nsz-1]))
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nsz++;
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/* Find the provider blocks for every AS on the path
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* and check allowed directions */
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bool *up = alloca(sizeof(bool) * nsz);
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bool *down = alloca(sizeof(bool) * nsz);
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bool unknown_flag = false;
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uint max_up = 0, min_up = 0, max_down = 0, min_down = 0;
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RT_READ(tab, tr);
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for (int ap=0; ap<nsz; ap++)
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for (uint ap=0; ap<nsz; ap++)
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{
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net_addr_union nau = { .aspa = NET_ADDR_ASPA(asns[ap]), };
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bool seen = false;
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/* Find some ASPAs */
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struct netindex *ni = net_find_index(tr->t->netindex, &nau.n);
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net *n = ni ? net_find(tr, ni) : NULL;
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if (!n)
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{
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unknown_flag = up[ap] = down[ap] = true;
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continue;
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}
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bool found = false, down = false, up = false;
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up[ap] = down[ap] = false;
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/* Walk the existing records */
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NET_READ_WALK_ROUTES(tr, n, ep, e)
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if (n) NET_READ_WALK_ROUTES(tr, n, ep, e)
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{
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if (!rte_is_valid(&e->rte))
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continue;
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@ -777,48 +771,80 @@ int aspa_check(rtable *tab, const adata *path)
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if (!ea)
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continue;
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seen = true;
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/* Actually found some ASPA */
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found = true;
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for (uint i=0; i * sizeof(u32) < ea->u.ptr->length; i++)
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{
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if ((ap > 0) && ((u32 *) ea->u.ptr->data)[i] == asns[ap-1])
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down[ap] = true;
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up = true;
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if ((ap + 1 < nsz) && ((u32 *) ea->u.ptr->data)[i] == asns[ap+1])
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up[ap] = true;
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down = true;
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if (down[ap] && up[ap])
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break;
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if (down && up)
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/* Both peers found */
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goto end_of_aspa;
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}
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}
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end_of_aspa:;
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if (down[ap] && up[ap])
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break;
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/* Fast path for the upstream check */
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if (force_upstream)
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{
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if (!found)
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/* Move min-upstream */
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min_up = ap;
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else if (ap && !up)
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/* Exists but doesn't allow this upstream */
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return ASPA_INVALID_LEAK;
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}
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/* No ASPA for this ASN, therefore UNKNOWN */
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if (!seen)
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unknown_flag = up[ap] = down[ap] = true;
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/* Fast path for no ASPA here */
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else if (!found)
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{
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/* Extend max-downstream (min-downstream is stopped by unknown) */
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max_down = ap+1;
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/* Move min-upstream (can't include unknown) */
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min_up = ap;
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}
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/* ASPA exists and downstream may be extended */
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else if (down)
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{
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/* Extending max-downstream always */
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max_down = ap+1;
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/* Extending min-downstream unless unknown seen */
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if (min_down == ap)
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min_down = ap+1;
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/* Downstream only */
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if (!up)
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min_up = max_up = ap;
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}
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/* No extension for downstream, force upstream only from now */
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else
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{
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force_upstream = 1;
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/* Not even upstream, move the ending here */
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if (!up)
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min_up = max_up = ap;
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}
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}
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/* Check whether the topology is first ramp up and then ramp down. */
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int up_end = 0;
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while (up_end < nsz && up[up_end])
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up_end++;
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/* Is the path surely valid? */
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if (min_up <= min_down)
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return ASPA_VALID;
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int down_end = nsz - 1;
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while (down_end > 0 && down[down_end])
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down_end--;
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/* A significant overlap of obvious unknowns or misconfigured ASPAs. */
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if (up_end - down_end >= 2)
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/* Is the path maybe valid? */
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if (max_up <= max_down)
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return ASPA_UNKNOWN;
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/* The path has either a single transit provider, or a peering pair on top */
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else if (up_end - down_end >= 0)
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return unknown_flag ? ASPA_UNKNOWN : ASPA_VALID;
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/* There is a gap between valid ramp up and valid ramp down */
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else
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return ASPA_INVALID;
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/* Now there is surely a valley there. */
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return ASPA_INVALID_LEAK;
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}
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struct rte_storage *
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@ -40,7 +40,7 @@ CF_ENUM(T_ENUM_BGP_ORIGIN, ORIGIN_, IGP, EGP, INCOMPLETE)
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CF_KEYWORDS(CEASE, PREFIX, LIMIT, HIT, ADMINISTRATIVE, SHUTDOWN, RESET, PEER,
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CONFIGURATION, CHANGE, DECONFIGURED, CONNECTION, REJECTED, COLLISION,
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OUT, OF, RESOURCES)
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OUT, OF, RESOURCES, ASPA_CHECK_CUSTOMER)
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%type<i> bgp_cease_mask bgp_cease_list bgp_cease_flag bgp_role_name
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@ -383,6 +383,29 @@ CF_CLI(RELOAD BGP OUT, proto_patt, [<name>], [[Refresh routes to neighbor]])
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proto_apply_cmd($4, bgp_reload_out, 1, 0);
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}
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/* ASPA shortcuts */
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term: ASPA_CHECK '(' rtable ')' { $$ =
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f_new_inst(FI_ASPA_CHECK_EXPLICIT,
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f_new_inst(FI_EA_GET,
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f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_ROUTE, .val.rte = NULL, }),
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ea_class_find_by_name("bgp_path")
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),
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f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_BOOL, .val.i = 0, }),
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$3
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);
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}
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term: ASPA_CHECK_CUSTOMER '(' rtable ')' { $$ =
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f_new_inst(FI_ASPA_CHECK_EXPLICIT,
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f_new_inst(FI_EA_GET,
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f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_ROUTE, .val.rte = NULL, }),
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ea_class_find_by_name("bgp_path")
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),
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f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_BOOL, .val.i = 1, }),
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$3
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);
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}
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CF_CODE
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CF_END
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