Rewrite roa_check() for integrated BIRD
Thanks to Ondrej Zajicek for his support with writing this code.
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cb1bd816db
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0264ccf6f4
7 changed files with 101 additions and 20 deletions
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@ -278,6 +278,7 @@ CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNSET, RETURN,
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TRUE, FALSE, RT, RO, UNKNOWN, GENERIC,
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FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, CAST, DEST, IFNAME, IFINDEX,
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PREFERENCE,
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ROA_CHECK,
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LEN,
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DEFINED,
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ADD, DELETE, CONTAINS, RESET,
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@ -759,10 +760,8 @@ term:
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| DELETE '(' term ',' term ')' { $$ = f_new_inst(); $$->code = P('C','a'); $$->a1.p = $3; $$->a2.p = $5; $$->aux = 'd'; }
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| FILTER '(' term ',' term ')' { $$ = f_new_inst(); $$->code = P('C','a'); $$->a1.p = $3; $$->a2.p = $5; $$->aux = 'f'; }
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/*
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| ROA_CHECK '(' SYM ')' { $$ = f_generate_roa_check($3, NULL, NULL); }
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| ROA_CHECK '(' SYM ',' term ',' term ')' { $$ = f_generate_roa_check($3, $5, $7); }
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*/
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| ROA_CHECK '(' rtable ')' { $$ = f_generate_roa_check($3, NULL, NULL); }
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| ROA_CHECK '(' rtable ',' term ',' term ')' { $$ = f_generate_roa_check($3, $5, $7); }
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/* | term '.' LEN { $$->code = P('P','l'); } */
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@ -54,9 +54,8 @@ f_generate_complex(int operation, int operation_aux, struct f_inst *dyn, struct
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return set_dyn;
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}
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#if 0
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struct f_inst *
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f_generate_roa_check(struct symbol *sym, struct f_inst *prefix, struct f_inst *asn)
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f_generate_roa_check(struct rtable_config *table, struct f_inst *prefix, struct f_inst *asn)
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{
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struct f_inst_roa_check *ret = cfg_allocz(sizeof(struct f_inst_roa_check));
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ret->i.code = P('R','C');
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@ -65,13 +64,12 @@ f_generate_roa_check(struct symbol *sym, struct f_inst *prefix, struct f_inst *a
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ret->i.arg2 = asn;
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/* prefix == NULL <-> asn == NULL */
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if ((sym->class != SYM_ROA) || ! sym->def)
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cf_error("%s is not a ROA table", sym->name);
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ret->rtc = sym->def;
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if (table->addr_type != NET_ROA4 && table->addr_type != NET_ROA6)
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cf_error("%s is not a ROA table", table->name);
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ret->rtc = table;
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return &ret->i;
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}
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#endif
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char *
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filter_name(struct filter *filter)
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@ -39,6 +39,8 @@
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#include "lib/socket.h"
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#include "lib/string.h"
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#include "lib/unaligned.h"
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#include "lib/net.h"
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#include "lib/ip.h"
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#include "nest/route.h"
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#include "nest/protocol.h"
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#include "nest/iface.h"
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@ -1241,7 +1243,7 @@ interpret(struct f_inst *what)
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break;
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#if 0
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case P('R','C'): /* ROA Check */
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if (what->arg1)
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{
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@ -1266,15 +1268,15 @@ interpret(struct f_inst *what)
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as_path_get_last(e->u.ptr, &as);
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}
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struct roa_table_config *rtc = ((struct f_inst_roa_check *) what)->rtc;
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if (!rtc->table)
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struct rtable *table = ((struct f_inst_roa_check *) what)->rtc->table;
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if (!table || table->addr_type != (v1.val.net->type == NET_IP4 ? NET_ROA4 : NET_ROA6))
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runtime("Missing ROA table");
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res.type = T_ENUM_ROA;
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res.val.i = ROA_UNKNOWN;
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// XXXX res.val.i = roa_check_net(rtc->table, &v1.val.net, as);
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res.val.i = net_roa_check(table, v1.val.net, as);
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break;
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#endif
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default:
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bug( "Unknown instruction %d (%c)", what->code, what->code & 0xff);
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@ -35,7 +35,7 @@ struct f_inst { /* Instruction */
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/* Not enough fields in f_inst for three args used by roa_check() */
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struct f_inst_roa_check {
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struct f_inst i;
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struct roa_table_config *rtc;
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struct rtable_config *rtc;
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};
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struct f_prefix {
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@ -67,7 +67,7 @@ struct f_inst *f_new_inst(void);
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struct f_inst *f_new_dynamic_attr(int type, int f_type, int code); /* Type as core knows it, type as filters know it, and code of dynamic attribute */
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struct f_tree *f_new_tree(void);
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struct f_inst *f_generate_complex(int operation, int operation_aux, struct f_inst *dyn, struct f_inst *argument);
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// struct f_inst *f_generate_roa_check(struct symbol *sym, struct f_inst *prefix, struct f_inst *asn);
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struct f_inst *f_generate_roa_check(struct rtable_config *table, struct f_inst *prefix, struct f_inst *asn);
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struct f_tree *build_tree(struct f_tree *);
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@ -72,6 +72,7 @@ static inline struct fib_node * fib_user_to_node(struct fib *f, void *e)
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void fib_init(struct fib *f, pool *p, uint addr_type, uint node_size, uint node_offset, uint hash_order, fib_init_fn init);
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void *fib_find(struct fib *, const net_addr *); /* Find or return NULL if doesn't exist */
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void *fib_get_chain(struct fib *f, const net_addr *a); /* Find first node in linked list from hash table */
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void *fib_get(struct fib *, const net_addr *); /* Find or create new if nonexistent */
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void *fib_route(struct fib *, const net_addr *); /* Longest-match routing lookup */
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void fib_delete(struct fib *, void *); /* Remove fib entry */
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@ -273,8 +274,9 @@ void rt_commit(struct config *new, struct config *old);
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void rt_lock_table(rtable *);
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void rt_unlock_table(rtable *);
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void rt_setup(pool *, rtable *, char *, struct rtable_config *);
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static inline net *net_find(rtable *tab, net_addr *addr) { return (net *) fib_find(&tab->fib, addr); }
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static inline net *net_get(rtable *tab, net_addr *addr) { return (net *) fib_get(&tab->fib, addr); }
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static inline net *net_find(rtable *tab, const net_addr *addr) { return (net *) fib_find(&tab->fib, addr); }
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static inline net *net_get(rtable *tab, const net_addr *addr) { return (net *) fib_get(&tab->fib, addr); }
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byte net_roa_check(rtable *tab, const net_addr *n, u32 asn);
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rte *rte_find(net *net, struct rte_src *src);
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rte *rte_get_temp(struct rta *);
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@ -195,6 +195,15 @@ fib_hash(struct fib *f, const net_addr *a)
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}
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}
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void *
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fib_get_chain(struct fib *f, const net_addr *a)
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{
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ASSERT(f->addr_type == a->type);
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struct fib_node *e = f->hash_table[fib_hash(f, a)];
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return e;
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}
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/**
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* fib_find - search for FIB node by prefix
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* @f: FIB to search in
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@ -100,6 +100,77 @@ net_route_ip6(struct fib *f, net_addr_ip6 *n)
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return r;
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}
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static byte
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net_roa4_check(rtable *tab, const net_addr_ip4 *px, u32 asn)
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{
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struct net_addr_roa4 n = NET_ADDR_ROA4(px->prefix, px->pxlen, 0, 0);
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byte anything = 0;
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struct fib_node *fn;
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while (1)
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{
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for (fn = fib_get_chain(&tab->fib, (net_addr *) &n); fn; fn = fn->next)
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{
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net *r = fib_node_to_user(&tab->fib, fn);
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if (rte_is_valid(r->routes) && ipa_in_netX(ipa_from_ip4(px->prefix), r->n.addr))
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{
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net_addr_roa4 *roa = (void *) r->n.addr;
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anything = 1;
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if (asn && (roa->asn == asn) && (roa->max_pxlen >= px->pxlen))
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return ROA_VALID;
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}
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}
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if (n.pxlen == 0)
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break;
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n.pxlen--;
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ip4_clrbit(&n.prefix, n.pxlen);
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}
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return anything ? ROA_INVALID : ROA_UNKNOWN;
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}
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static byte
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net_roa6_check(rtable *tab, const net_addr_ip6 *px, u32 asn)
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{
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struct net_addr_roa6 n = NET_ADDR_ROA6(px->prefix, px->pxlen, 0, 0);
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byte anything = 0;
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struct fib_node *fn;
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while (1)
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{
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for (fn = fib_get_chain(&tab->fib, (net_addr *) &n); fn; fn = fn->next)
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{
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net *r = fib_node_to_user(&tab->fib, fn);
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if (rte_is_valid(r->routes) && ipa_in_netX(ipa_from_ip6(px->prefix), r->n.addr))
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{
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net_addr_roa6 *roa = (void *) r->n.addr;
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anything = 1;
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if (asn && (roa->asn == asn) && (roa->max_pxlen >= px->pxlen))
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return ROA_VALID;
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}
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}
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if (n.pxlen == 0)
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break;
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n.pxlen--;
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ip6_clrbit(&n.prefix, n.pxlen);
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}
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return anything ? ROA_INVALID : ROA_UNKNOWN;
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}
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byte
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net_roa_check(rtable *tab, const net_addr *n, u32 asn)
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{
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if (tab->addr_type == NET_ROA4)
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return net_roa4_check(tab, (const net_addr_ip4 *) n, asn);
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else
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return net_roa6_check(tab, (const net_addr_ip6 *) n, asn);
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}
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void *
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net_route(rtable *tab, const net_addr *n)
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{
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