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Extends set operations in filters.

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Allows add/filter/delete clist on clist (set algebra on clists).

Allows number ~ bgppath match.
This commit is contained in:
Ondrej Zajicek 2012-03-15 20:42:29 +01:00
parent 9f1500f50a
commit 0888a737b0
5 changed files with 136 additions and 25 deletions
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11
doc/bird.sgml
View File

@ -875,19 +875,22 @@ incompatible with each other (that is to prevent you from shooting in the foot).
<cf>add(<m/C/,<m/P/)</cf> adds pair (or quad) <m/P/ to clist
<m/C/ and returns the result. If item <m/P/ is already in
clist <m/C/, it does nothing.
clist <m/C/, it does nothing. <m/P/ may also be a clist,
in that case all its members are added; i.e., it works as clist union.
<cf>delete(<m/C/,<m/P/)</cf> deletes pair (or quad)
<m/P/ from clist <m/C/ and returns the result. If clist
<m/C/ does not contain item <m/P/, it does nothing.
<m/P/ may also be a pair (or quad) set, in that case the
operator deletes all items from clist <m/C/ that are also
members of set <m/P/.
members of set <m/P/. Moreover, <m/P/ may also be a clist,
which works analogously; i.e., it works as clist difference.
<cf>filter(<m/C/,<m/P/)</cf> deletes all items from clist
<m/C/ that are not members of pair (or quad) set <m/P/.
I.e., <cf/filter/ do the same as <cf/delete/ with inverted
set <m/P/.
set <m/P/. <m/P/ may also be a clist, which works analogously;
i.e., it works as clist intersection.
Statement <cf><m/C/ = add(<m/C/, <m/P/);</cf> can be shortened to
<cf><m/C/.add(<m/P/);</cf> if <m/C/ is appropriate route
@ -910,7 +913,7 @@ incompatible with each other (that is to prevent you from shooting in the foot).
Special operators include <cf/&tilde;/ for "is element of a set" operation - it can be
used on element and set of elements of the same type (returning true if element is contained in the given set), or
on two strings (returning true if first string matches a shell-like pattern stored in second string) or on IP and prefix (returning true if IP is within the range defined by that prefix), or on
prefix and prefix (returning true if first prefix is more specific than second one) or on bgppath and bgpmask (returning true if the path matches the mask) or on pair/quad and clist (returning true if the pair/quad is element of the clist) or on clist and pair/quad set (returning true if there is an element of the clist that is also a member of the pair/quad set).
prefix and prefix (returning true if first prefix is more specific than second one) or on bgppath and bgpmask (returning true if the path matches the mask) or on number and bgppath (returning true if the number is in the path) or on pair/quad and clist (returning true if the pair/quad is element of the clist) or on clist and pair/quad set (returning true if there is an element of the clist that is also a member of the pair/quad set).
<sect>Control structures

59
filter/filter.c
View File

@ -228,6 +228,9 @@ val_simple_in_range(struct f_val v1, struct f_val v2)
{
if ((v1.type == T_PATH) && (v2.type == T_PATH_MASK))
return as_path_match(v1.val.ad, v2.val.path_mask);
if ((v1.type == T_INT) && (v2.type == T_PATH))
return as_path_is_member(v2.val.ad, v1.val.i);
if (((v1.type == T_PAIR) || (v1.type == T_QUAD)) && (v2.type == T_CLIST))
return int_set_contains(v2.val.ad, v1.val.i);
#ifndef IPV6
@ -320,28 +323,34 @@ eclist_match_set(struct adata *list, struct f_tree *set)
}
static struct adata *
clist_filter(struct linpool *pool, struct adata *clist, struct f_tree *set, int pos)
clist_filter(struct linpool *pool, struct adata *list, struct f_val set, int pos)
{
if (!clist)
if (!list)
return NULL;
int tree = (set.type == T_SET); /* 1 -> set is T_SET, 0 -> set is T_CLIST */
struct f_val v;
clist_set_type(set, &v);
if (tree)
clist_set_type(set.val.t, &v);
else
v.type = T_PAIR;
u32 tmp[clist->length/4];
u32 *l = (u32 *) clist->data;
int len = int_set_get_size(list);
u32 *l = int_set_get_data(list);
u32 tmp[len];
u32 *k = tmp;
u32 *end = l + clist->length/4;
u32 *end = l + len;
while (l < end) {
v.val.i = *l++;
if (pos == !!find_tree(set, v)) /* pos && find_tree || !pos && !find_tree */
/* pos && member(val, set) || !pos && !member(val, set), member() depends on tree */
if ((tree ? !!find_tree(set.val.t, v) : int_set_contains(set.val.ad, v.val.i)) == pos)
*k++ = v.val.i;
}
int nl = (k - tmp) * 4;
if (nl == clist->length)
return clist;
if (nl == list->length)
return list;
struct adata *res = adata_empty(pool, nl);
memcpy(res->data, tmp, nl);
@ -349,11 +358,12 @@ clist_filter(struct linpool *pool, struct adata *clist, struct f_tree *set, int
}
static struct adata *
eclist_filter(struct linpool *pool, struct adata *list, struct f_tree *set, int pos)
eclist_filter(struct linpool *pool, struct adata *list, struct f_val set, int pos)
{
if (!list)
return NULL;
int tree = (set.type == T_SET); /* 1 -> set is T_SET, 0 -> set is T_CLIST */
struct f_val v;
int len = int_set_get_size(list);
@ -365,7 +375,8 @@ eclist_filter(struct linpool *pool, struct adata *list, struct f_tree *set, int
v.type = T_EC;
for (i = 0; i < len; i += 2) {
v.val.ec = ec_get(l, i);
if (pos == !!find_tree(set, v)) { /* pos && find_tree || !pos && !find_tree */
/* pos && member(val, set) || !pos && !member(val, set), member() depends on tree */
if ((tree ? !!find_tree(set.val.t, v) : ec_set_contains(set.val.ad, v.val.ec)) == pos) {
*k++ = l[i];
*k++ = l[i+1];
}
@ -1116,6 +1127,8 @@ interpret(struct f_inst *what)
#endif
else if ((v2.type == T_SET) && clist_set_type(v2.val.t, &dummy))
arg_set = 1;
else if (v2.type == T_CLIST)
arg_set = 2;
else
runtime("Can't add/delete non-pair");
@ -1123,22 +1136,25 @@ interpret(struct f_inst *what)
switch (what->aux)
{
case 'a':
if (arg_set)
if (arg_set == 1)
runtime("Can't add set");
res.val.ad = int_set_add(f_pool, v1.val.ad, i);
else if (!arg_set)
res.val.ad = int_set_add(f_pool, v1.val.ad, i);
else
res.val.ad = int_set_union(f_pool, v1.val.ad, v2.val.ad);
break;
case 'd':
if (!arg_set)
res.val.ad = int_set_del(f_pool, v1.val.ad, i);
else
res.val.ad = clist_filter(f_pool, v1.val.ad, v2.val.t, 0);
res.val.ad = clist_filter(f_pool, v1.val.ad, v2, 0);
break;
case 'f':
if (!arg_set)
runtime("Can't filter pair");
res.val.ad = clist_filter(f_pool, v1.val.ad, v2.val.t, 1);
res.val.ad = clist_filter(f_pool, v1.val.ad, v2, 1);
break;
default:
@ -1153,6 +1169,8 @@ interpret(struct f_inst *what)
/* v2.val is either EC or EC-set */
if ((v2.type == T_SET) && eclist_set_type(v2.val.t))
arg_set = 1;
else if (v2.type == T_ECLIST)
arg_set = 2;
else if (v2.type != T_EC)
runtime("Can't add/delete non-pair");
@ -1160,22 +1178,25 @@ interpret(struct f_inst *what)
switch (what->aux)
{
case 'a':
if (arg_set)
if (arg_set == 1)
runtime("Can't add set");
res.val.ad = ec_set_add(f_pool, v1.val.ad, v2.val.ec);
else if (!arg_set)
res.val.ad = ec_set_add(f_pool, v1.val.ad, v2.val.ec);
else
res.val.ad = ec_set_union(f_pool, v1.val.ad, v2.val.ad);
break;
case 'd':
if (!arg_set)
res.val.ad = ec_set_del(f_pool, v1.val.ad, v2.val.ec);
else
res.val.ad = eclist_filter(f_pool, v1.val.ad, v2.val.t, 0);
res.val.ad = eclist_filter(f_pool, v1.val.ad, v2, 0);
break;
case 'f':
if (!arg_set)
runtime("Can't filter ec");
res.val.ad = eclist_filter(f_pool, v1.val.ad, v2.val.t, 1);
res.val.ad = eclist_filter(f_pool, v1.val.ad, v2, 1);
break;
default:

25
filter/test.conf
View File

@ -57,7 +57,9 @@ bgpmask pm1;
bgpmask pm2;
bgppath p2;
clist l;
clist l2;
eclist el;
eclist el2;
{
pm1 = / 4 3 2 1 /;
pm2 = [= 4 3 2 1 =];
@ -67,10 +69,10 @@ eclist el;
p2 = prepend( p2, 3 );
p2 = prepend( p2, 4 );
print "Testing paths: ", p2;
print "Should be true: ", p2 ~ pm1, " ", p2 ~ pm2;
print "Should be true: ", p2 ~ pm1, " ", p2 ~ pm2, " ", 3 ~ p2;
print "4 = ", p2.len;
p2 = prepend( p2, 5 );
print "Should be false: ", p2 ~ pm1, " ", p2 ~ pm2;
print "Should be false: ", p2 ~ pm1, " ", p2 ~ pm2, " ", 10 ~ p2;
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 ~ [= (3+2) (2*2) 3 2 1 =], " ", p2 ~ mkpath(5, 4);
@ -108,6 +110,7 @@ eclist el;
l = add( l, (3,3) );
l = add( l, (3,4) );
l = add( l, (3,5) );
l2 = filter( l, [(3,*)] );
l = delete( l, [(3,2..4)] );
print "Community list (1,2) (3,1) (3,5) ", l;
l = add( l, (3,2) );
@ -120,6 +123,14 @@ eclist el;
print "Community list (3,1) ", l;
l = delete( l, [(*,(onef(5)))] );
print "Community list empty ", l;
l2 = add( l2, (3,6) );
l = filter( l2, [(3,1..4)] );
l2 = filter( l2, [(3,3..6)] );
print "clist A (1..4): ", l;
print "clist B (3..6): ", l2;
print "clist A union B: ", add( l2, l );
print "clist A isect B: ", filter( l, l2 );
print "clist A \ B: ", delete( l, l2 );
el = -- empty --;
el = add(el, (rt, 10, 20));
@ -143,6 +154,16 @@ eclist el;
print "EC list (rt, 10, 1) (rt, 10, 30): ", el;
print "Testing EC list, true: ", (rt, 10, 1) ~ el, " ", el ~ [(rt, 10, ten..40)];
print "Testing EC list, false: ", (rt, 10, 20) ~ el, " ", (ro, 10.20.30.40, 100) ~ el, " ", el ~ [(rt, 10, 35..40)], " ", el ~ [(ro, 10, *)];
el = add(el, (rt, 10, 40));
el2 = filter(el, [(rt, 10, 20..40)] );
el2 = add(el2, (rt, 10, 50));
print "eclist A (1,30,40): ", el;
print "eclist B (30,40,50): ", el2;
print "eclist A union B: ", add( el2, el );
print "eclist A isect B: ", filter( el, el2 );
print "eclist A \ B: ", delete( el, el2 );
}
function bla()

64
nest/a-set.c
View File

@ -264,3 +264,67 @@ ec_set_del(struct linpool *pool, struct adata *list, u64 val)
return res;
}
struct adata *
int_set_union(struct linpool *pool, struct adata *l1, struct adata *l2)
{
if (!l1)
return l2;
if (!l2)
return l1;
struct adata *res;
int len = int_set_get_size(l2);
u32 *l = int_set_get_data(l2);
u32 tmp[len];
u32 *k = tmp;
int i;
for (i = 0; i < len; i++)
if (!int_set_contains(l1, l[i]))
*k++ = l[i];
if (k == tmp)
return l1;
len = (k - tmp) * 4;
res = lp_alloc(pool, sizeof(struct adata) + l1->length + len);
res->length = l1->length + len;
memcpy(res->data, l1->data, l1->length);
memcpy(res->data + l1->length, tmp, len);
return res;
}
struct adata *
ec_set_union(struct linpool *pool, struct adata *l1, struct adata *l2)
{
if (!l1)
return l2;
if (!l2)
return l1;
struct adata *res;
int len = int_set_get_size(l2);
u32 *l = int_set_get_data(l2);
u32 tmp[len];
u32 *k = tmp;
int i;
for (i = 0; i < len; i += 2)
if (!ec_set_contains(l1, ec_get(l, i)))
{
*k++ = l[i];
*k++ = l[i+1];
}
if (k == tmp)
return l1;
len = (k - tmp) * 4;
res = lp_alloc(pool, sizeof(struct adata) + l1->length + len);
res->length = l1->length + len;
memcpy(res->data, l1->data, l1->length);
memcpy(res->data + l1->length, tmp, len);
return res;
}

2
nest/attrs.h
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@ -96,6 +96,8 @@ struct adata *int_set_add(struct linpool *pool, struct adata *list, u32 val);
struct adata *ec_set_add(struct linpool *pool, struct adata *list, u64 val);
struct adata *int_set_del(struct linpool *pool, struct adata *list, u32 val);
struct adata *ec_set_del(struct linpool *pool, struct adata *list, u64 val);
struct adata *int_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
struct adata *ec_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
#endif