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|
/*
* BIRD -- Flow specification (RFC 5575) grammar
*
* (c) 2016 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
CF_HDR
#define PARSER 1
#include "nest/bird.h"
#include "lib/flowspec.h"
CF_DEFINES
struct flow_builder *this_flow;
CF_DECLS
%type <i32> flow_num_op flow_srcdst flow_logic_op flow_num_type_ flow_frag_val flow_neg
%type <net_ptr> net_flow4_ net_flow6_ net_flow_
CF_KEYWORDS(FLOW4, FLOW6, DST, SRC, PROTO, NEXT, HEADER, DPORT, SPORT, ICMP,
TYPE, CODE, TCP, FLAGS, LENGTH, DSCP, DONT_FRAGMENT, IS_FRAGMENT,
FIRST_FRAGMENT, LAST_FRAGMENT, FRAGMENT, LABEL, OFFSET)
CF_GRAMMAR
/* Network Flow Specification */
flow_num_op:
TRUE { $$ = FLOW_OP_TRUE; }
| '=' { $$ = FLOW_OP_EQ; }
| NEQ { $$ = FLOW_OP_NEQ; }
| '<' { $$ = FLOW_OP_LT; }
| LEQ { $$ = FLOW_OP_LEQ; }
| '>' { $$ = FLOW_OP_GT; }
| GEQ { $$ = FLOW_OP_GEQ; }
| FALSE { $$ = FLOW_OP_FALSE; }
;
flow_logic_op:
OR { $$ = FLOW_OP_OR; }
| AND { $$ = FLOW_OP_AND; }
;
flow_num_type_:
PROTO { $$ = FLOW_TYPE_IP_PROTOCOL; }
| NEXT HEADER { $$ = FLOW_TYPE_NEXT_HEADER; }
| PORT { $$ = FLOW_TYPE_PORT; }
| DPORT { $$ = FLOW_TYPE_DST_PORT; }
| SPORT { $$ = FLOW_TYPE_SRC_PORT; }
| ICMP TYPE { $$ = FLOW_TYPE_ICMP_TYPE; }
| ICMP CODE { $$ = FLOW_TYPE_ICMP_CODE; }
| LENGTH { $$ = FLOW_TYPE_PACKET_LENGTH; }
| DSCP { $$ = FLOW_TYPE_DSCP; }
| LABEL { $$ = FLOW_TYPE_LABEL; }
;
flow_num_type: flow_num_type_{ flow_builder_set_type(this_flow, $1); };
flow_flag_type: TCP FLAGS { flow_builder_set_type(this_flow, FLOW_TYPE_TCP_FLAGS); };
flow_frag_type: FRAGMENT { flow_builder_set_type(this_flow, FLOW_TYPE_FRAGMENT); };
flow_srcdst:
DST { $$ = FLOW_TYPE_DST_PREFIX; }
| SRC { $$ = FLOW_TYPE_SRC_PREFIX; }
;
flow_num_opts:
flow_num_op expr {
flow_check_cf_value_length(this_flow, $2);
flow_builder_add_op_val(this_flow, $1, $2);
}
| flow_num_opts flow_logic_op flow_num_op expr {
flow_check_cf_value_length(this_flow, $4);
flow_builder_add_op_val(this_flow, $2 | $3, $4);
}
| flow_num_opt_ext
| flow_num_opts OR flow_num_opt_ext
;
flow_num_opt_ext_expr:
expr {
flow_check_cf_value_length(this_flow, $1);
flow_builder_add_op_val(this_flow, FLOW_OP_EQ, $1);
}
| expr DDOT expr {
flow_check_cf_value_length(this_flow, $1);
flow_check_cf_value_length(this_flow, $3);
flow_builder_add_op_val(this_flow, FLOW_OP_GEQ, $1);
flow_builder_add_op_val(this_flow, FLOW_OP_AND | FLOW_OP_LEQ, $3);
}
;
flow_num_opt_ext:
flow_num_opt_ext_expr
| flow_num_opt_ext ',' flow_num_opt_ext_expr
;
flow_bmk_opts:
flow_neg expr '/' expr {
flow_check_cf_bmk_values(this_flow, $1, $2, $4);
flow_builder_add_val_mask(this_flow, $1, $2, $4);
}
| flow_bmk_opts flow_logic_op flow_neg expr '/' expr {
flow_check_cf_bmk_values(this_flow, $3, $4, $6);
flow_builder_add_val_mask(this_flow, $2 | $3, $4, $6);
}
| flow_bmk_opts ',' flow_neg expr '/' expr {
flow_check_cf_bmk_values(this_flow, $3, $4, $6);
flow_builder_add_val_mask(this_flow, 0x40 | $3, $4, $6); /* AND */
}
;
flow_neg:
/* empty */ { $$ = 0x00; }
| '!' { $$ = 0x02; }
;
flow_frag_val:
DONT_FRAGMENT { $$ = 1; }
| IS_FRAGMENT { $$ = 2; }
| FIRST_FRAGMENT { $$ = 4; }
| LAST_FRAGMENT { $$ = 8; }
;
flow_frag_opts:
flow_neg flow_frag_val {
flow_builder_add_val_mask(this_flow, 0, ($1 ? 0 : $2), $2);
}
| flow_frag_opts flow_logic_op flow_neg flow_frag_val {
flow_builder_add_val_mask(this_flow, $2, ($3 ? 0 : $4), $4);
}
| flow_frag_opts ',' flow_neg flow_frag_val {
flow_builder_add_val_mask(this_flow, 0x40, ($3 ? 0 : $4), $4); /* AND */
}
;
flow4_item:
flow_srcdst net_ip4 {
flow_builder_set_type(this_flow, $1);
flow_builder4_add_pfx(this_flow, (net_addr_ip4 *) &($2));
}
| flow_num_type flow_num_opts
| flow_flag_type flow_bmk_opts
| flow_frag_type flow_frag_opts
;
flow6_item:
flow_srcdst net_ip6 {
flow_builder_set_type(this_flow, $1);
flow_builder6_add_pfx(this_flow, (net_addr_ip6 *) &($2), 0);
}
| flow_srcdst net_ip6 OFFSET NUM {
if ($4 > $2.pxlen)
cf_error("Prefix offset is higher than prefix length");
flow_builder_set_type(this_flow, $1);
flow_builder6_add_pfx(this_flow, (net_addr_ip6 *) &($2), $4);
}
| flow_num_type flow_num_opts
| flow_flag_type flow_bmk_opts
| flow_frag_type flow_frag_opts
;
flow4_opts:
/* empty */
| flow4_opts flow4_item ';'
;
flow6_opts:
/* empty */
| flow6_opts flow6_item ';'
;
flow_builder_init:
{
if (this_flow == NULL)
this_flow = flow_builder_init(config_pool); /* FIXME: This should be allocated from tmp in future */
else
flow_builder_clear(this_flow);
};
flow_builder_set_ipv4: { this_flow->ipv6 = 0; };
flow_builder_set_ipv6: { this_flow->ipv6 = 1; };
net_flow4_: FLOW4 '{' flow_builder_init flow_builder_set_ipv4 flow4_opts '}'
{
$$ = (net_addr *) flow_builder4_finalize(this_flow, cfg_mem);
flow4_validate_cf((net_addr_flow4 *) $$);
};
net_flow6_: FLOW6 '{' flow_builder_init flow_builder_set_ipv6 flow6_opts '}'
{
$$ = (net_addr *) flow_builder6_finalize(this_flow, cfg_mem);
flow6_validate_cf((net_addr_flow6 *) $$);
};
net_flow_: net_flow4_ | net_flow6_ ;
CF_CODE
CF_END
|
