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Filter: Allow to use sets in path masks

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This commit is contained in:
Ondrej Zajicek (work) 2019-08-06 16:58:13 +02:00
parent e2b530aa72
commit ef113c6f72
4 changed files with 38 additions and 2 deletions
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4
filter/config.Y
View file

@ -801,6 +801,10 @@ bgp_path:
bgp_path_tail:
NUM bgp_path_tail { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .asn = $1, .kind = PM_ASN, }, }); $$->next = $2; }
| NUM DDOT NUM bgp_path_tail { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .from = $1, .to = $3, .kind = PM_ASN_RANGE }, }); $$->next = $4; }
| '[' set_items ']' bgp_path_tail {
if ($2->from.type != T_INT) cf_error("Only integer sets allowed in path mask");
$$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .set = build_tree($2), .kind = PM_ASN_SET }, }); $$->next = $4;
}
| '*' bgp_path_tail { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .kind = PM_ASTERISK }, }); $$->next = $2; }
| '?' bgp_path_tail { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_PATH_MASK_ITEM, .val.pmi = { .kind = PM_QUESTION }, }); $$->next = $2; }
| bgp_path_expr bgp_path_tail { $$ = $1; $$->next = $2; }

1
filter/test.conf
View file

@ -626,6 +626,7 @@ bgppath p2;
bt_assert(p2 !~ [8, ten..(2*ten)]);
bt_assert(p2 ~ [= * 4 3 * 1 =]);
bt_assert(p2 ~ [= (3+2) (2*2) 3 2 1 =]);
bt_assert(p2 ~ [= 5 [2, 4, 6] 3 [1..2] 1 =]);
bt_assert(p2 ~ mkpath(5, 4));
bt_assert(p2.len = 5);

31
nest/a-path.c
View file

@ -740,6 +740,31 @@ pm_match(struct pm_pos *pos, u32 asn, u32 asn2)
return 0;
}
static int
pm_match_set(struct pm_pos *pos, struct f_tree *set)
{
struct f_val asn = { .type = T_INT };
if (! pos->set)
{
asn.val.i = pos->val.asn;
return !!find_tree(set, &asn);
}
const u8 *p = pos->val.sp;
int len = *p++;
int i;
for (i = 0; i < len; i++)
{
asn.val.i = get_as(p + i * BS);
if (find_tree(set, &asn))
return 1;
}
return 0;
}
static void
pm_mark(struct pm_pos *pos, int i, int plen, int *nl, int *nh)
{
@ -824,13 +849,17 @@ as_path_match(const struct adata *path, const struct f_path_mask *mask)
val2 = mask->item[m].to;
goto step;
case PM_QUESTION:
case PM_ASN_SET:
step:
nh = nl = -1;
for (i = h; i >= l; i--)
if (pos[i].mark)
{
pos[i].mark = 0;
if ((mask->item[m].kind == PM_QUESTION) || pm_match(pos + i, val, val2))
if ((mask->item[m].kind == PM_QUESTION) ||
((mask->item[m].kind != PM_ASN_SET) ?
pm_match(pos + i, val, val2) :
pm_match_set(pos + i, mask->item[m].set)))
pm_mark(pos, i, plen, &nl, &nh);
}

2
nest/attrs.h
View file

@ -60,11 +60,13 @@ static inline struct adata *as_path_prepend(struct linpool *pool, const struct a
#define PM_ASTERISK 2
#define PM_ASN_EXPR 3
#define PM_ASN_RANGE 4
#define PM_ASN_SET 5
struct f_path_mask_item {
union {
u32 asn; /* PM_ASN */
struct f_line *expr; /* PM_ASN_EXPR */
struct f_tree *set; /* PM_ASN_SET */
struct { /* PM_ASN_RANGE */
u32 from;
u32 to;