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Add AS# ranges to bgpmask.

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This commit is contained in:
Ondrej Filip 2016-06-08 16:22:44 +02:00
parent 90dc0f0843
commit a0fe1944d1
6 changed files with 35 additions and 13 deletions
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6
doc/bird.sgml
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@ -1165,8 +1165,10 @@ foot).
is 4 3 2 1, then: <tt>bgp_path &tilde; [= * 4 3 * =]</tt> is true,
but <tt>bgp_path &tilde; [= * 4 5 * =]</tt> is false. BGP mask
expressions can also contain integer expressions enclosed in parenthesis
and integer variables, for example <tt>[= * 4 (1+2) a =]</tt>. There is
also old syntax that uses / .. / instead of [= .. =] and ? instead of *.
and integer variables, for example <tt>[= * 4 (1+2) a =]</tt>. You can
also use ranges, for example <tt>[= * 3..5 2 100..200 * =]</tt>.
There is also old (deprecated) syntax that uses / .. / instead of [= .. =]
and ? instead of *.
<tag/clist/
Clist is similar to a set, except that unlike other sets, it can be

1
filter/config.Y
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@ -627,6 +627,7 @@ bgp_path:
bgp_path_tail1:
NUM bgp_path_tail1 { $$ = cfg_alloc(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_ASN; $$->val = $1; }
| NUM DDOT NUM bgp_path_tail1 { $$ = cfg_alloc(sizeof(struct f_path_mask)); $$->next = $4; $$->kind = PM_ASN_RANGE; $$->val = $1; $$->val2 = $3; }
| '*' bgp_path_tail1 { $$ = cfg_alloc(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_ASTERISK; $$->val = 0; }
| '?' bgp_path_tail1 { $$ = cfg_alloc(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_QUESTION; $$->val = 0; }
| bgp_path_expr bgp_path_tail1 { $$ = cfg_alloc(sizeof(struct f_path_mask)); $$->next = $2; $$->kind = PM_ASN_EXPR; $$->val = (uintptr_t) $1; }

4
filter/filter.c
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@ -79,6 +79,10 @@ pm_format(struct f_path_mask *p, buffer *buf)
buffer_puts(buf, "* ");
break;
case PM_ASN_RANGE:
buffer_print(buf, "%u..%u ", p->val, p->val2);
break;
case PM_ASN_EXPR:
buffer_print(buf, "%u ", f_eval_asn((struct f_inst *) p->val));
break;

9
filter/test.conf
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@ -90,20 +90,23 @@ clist l2;
eclist el;
eclist el2;
{
print "Entering path test...";
pm1 = / 4 3 2 1 /;
pm2 = [= 4 3 2 1 =];
pm2 = [= 3..6 3 2 1..2 =];
print "Testing path masks: ", pm1, " ", pm2;
p2 = prepend( + empty +, 1 );
p2 = prepend( p2, 2 );
p2 = prepend( p2, 3 );
p2 = prepend( p2, 4 );
print "Testing paths: ", p2;
print "Testing path: (4 3 2 1) = ", p2;
print "Should be true: ", p2 ~ pm1, " ", p2 ~ pm2, " ", 3 ~ p2, " ", p2 ~ [2, 10..20], " ", p2 ~ [4, 10..20];
print "4 = ", p2.len;
p2 = prepend( p2, 5 );
print "Should be false: ", p2 ~ pm1, " ", p2 ~ pm2, " ", 10 ~ p2, " ", p2 ~ [8, ten..(2*ten)];
print "Testing path: (5 4 3 2 1) = ", p2;
print "Should be false: ", p2 ~ pm1, " ", p2 ~ pm2, " ", 10 ~ p2, " ", p2 ~ [8, ten..(2*ten)], " ", p2 ~ [= 1..4 4 3 2 1 =], " ", p2 ~ [= 5 4 4..100 2 1 =];
print "Should be true: ", p2 ~ / ? 4 3 2 1 /, " ", p2, " ", / ? 4 3 2 1 /;
print "Should be true: ", p2 ~ [= * 4 3 * 1 =], " ", p2, " ", [= * 4 3 * 1 =];
print "Should be true: ", p2 ~ [= 5..6 4..10 1..3 1..3 1..65536 =];
print "Should be true: ", p2 ~ [= (3+2) (2*2) 3 2 1 =], " ", p2 ~ mkpath(5, 4);
print "Should be true: ", p2.len = 5, " ", p2.first = 5, " ", p2.last = 1;
print "5 = ", p2.len;

26
nest/a-path.c
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@ -435,18 +435,23 @@ parse_path(struct adata *path, struct pm_pos *pos)
static int
pm_match(struct pm_pos *pos, u32 asn)
pm_match(struct pm_pos *pos, u32 asn, u32 asn2)
{
u32 gas;
if (! pos->set)
return pos->val.asn == asn;
return ((pos->val.asn >= asn) && (pos->val.asn <= asn2));
u8 *p = pos->val.sp;
int len = *p++;
int i;
for (i = 0; i < len; i++)
if (get_as(p + i * BS) == asn)
{
gas = get_as(p + i * BS);
if ((gas >= asn) && (gas <= asn2))
return 1;
}
return 0;
}
@ -490,7 +495,7 @@ pm_mark(struct pm_pos *pos, int i, int plen, int *nl, int *nh)
* next part of mask, we advance each marked state.
* We start with marked first position, when we
* run out of marked positions, we reject. When
* we process the whole mask, we accept iff final position
* we process the whole mask, we accept if final position
* (auxiliary position after last real position in AS path)
* is marked.
*/
@ -502,6 +507,7 @@ as_path_match(struct adata *path, struct f_path_mask *mask)
int plen = parse_path(path, pos);
int l, h, i, nh, nl;
u32 val = 0;
u32 val2 = 0;
/* l and h are bound of interval of positions where
are marked states */
@ -525,12 +531,16 @@ as_path_match(struct adata *path, struct f_path_mask *mask)
h = plen;
break;
case PM_ASN:
val = mask->val;
case PM_ASN: /* Define single ASN as ASN..ASN - very narrow interval */
val2 = val = mask->val;
goto step;
case PM_ASN_EXPR:
val = f_eval_asn((struct f_inst *) mask->val);
val2 = val = f_eval_asn((struct f_inst *) mask->val);
goto step;
case PM_ASN_RANGE:
val = mask->val;
val2 = mask->val2;
goto step;
case PM_QUESTION:
step:
nh = nl = -1;
@ -538,7 +548,7 @@ as_path_match(struct adata *path, struct f_path_mask *mask)
if (pos[i].mark)
{
pos[i].mark = 0;
if ((mask->kind == PM_QUESTION) || pm_match(pos + i, val))
if ((mask->kind == PM_QUESTION) || pm_match(pos + i, val, val2))
pm_mark(pos, i, plen, &nl, &nh);
}

2
nest/attrs.h
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@ -45,11 +45,13 @@ struct adata *as_path_filter(struct linpool *pool, struct adata *path, struct f_
#define PM_QUESTION 1
#define PM_ASTERISK 2
#define PM_ASN_EXPR 3
#define PM_ASN_RANGE 4
struct f_path_mask {
struct f_path_mask *next;
int kind;
uintptr_t val;
uintptr_t val2;
};
int as_path_match(struct adata *path, struct f_path_mask *mask);