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gerrit.onosproject.org / onos-loxi / ac285ba5ecbd151eabd1f9265b33eaeea23086b6 / . / c_gen / c_match.py
blob: 8befb3f4c128df5063635afdcb74bfda178bbfee [file] [log] [blame]
# Copyright 2013, Big Switch Networks, Inc.
#
# LoxiGen is licensed under the Eclipse Public License, version 1.0 (EPL), with
# the following special exception:
#
# LOXI Exception
#
# As a special exception to the terms of the EPL, you may distribute libraries
# generated by LoxiGen (LoxiGen Libraries) under the terms of your choice, provided
# that copyright and licensing notices generated by LoxiGen are not altered or removed
# from the LoxiGen Libraries and the notice provided below is (i) included in
# the LoxiGen Libraries, if distributed in source code form and (ii) included in any
# documentation for the LoxiGen Libraries, if distributed in binary form.
#
# Notice: "Copyright 2013, Big Switch Networks, Inc. This library was generated by the LoxiGen Compiler."
#
# You may not use this file except in compliance with the EPL or LOXI Exception. You may obtain
# a copy of the EPL at:
#
# http://www.eclipse.org/legal/epl-v10.html
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# EPL for the specific language governing permissions and limitations
# under the EPL.
# @brief Generate wire to generic match conversion functions
#
# @fixme This has lots of C specific code that should be moved into c_gen
# of_match_to_wire_match(match, wire_match)
# of_wire_match_to_match(wire_match, match)
# Version is taken from the source in each case
#
# name
# type
# conditions
# v3 ident
# takes mask
import sys
import of_g
import loxi_front_end.match as match
import c_code_gen
def match_c_top_matter(out, name):
"""
Generate top matter for match C file
@param name The name of the output file
@param out The output file object
"""
c_code_gen.common_top_matter(out, name)
out.write("#include \"loci_log.h\"\n")
out.write("#include <loci/loci.h>\n")
def match_h_top_matter(out, name):
"""
Generate top matter for the C file
@param name The name of the output file
@param ih_name The name of the internal header file
@param out The output file object
"""
c_code_gen.common_top_matter(out, name)
out.write("""
#include <loci/loci_base.h>
""")
def gen_declarations(out):
out.write("""
/*
* Match serialize/deserialize declarations
* Wire match conversion function declarations
*/
extern int of_match_serialize(of_version_t version, of_match_t *match,
of_octets_t *octets);
extern int of_match_deserialize(of_version_t version, of_match_t *match,
of_octets_t *octets);
extern int of_match_v1_to_match(of_match_v1_t *src, of_match_t *dst);
extern int of_match_v2_to_match(of_match_v2_t *src, of_match_t *dst);
extern int of_match_v3_to_match(of_match_v3_t *src, of_match_t *dst);
extern int of_match_to_wire_match_v1(of_match_t *src, of_match_v1_t *dst);
extern int of_match_to_wire_match_v2(of_match_t *src, of_match_v2_t *dst);
extern int of_match_to_wire_match_v3(of_match_t *src, of_match_v3_t *dst);
""")
def gen_v4_match_compat(out):
"""
Code for coercing version 1.3 matches to 1.2 matches
@FIXME This is a stopgap and needs to get cleaned up.
"""
out.write("""
/**
* Definitions to coerce v4 match (version 1.3) to v3 matches
* (version 1.2).
* @FIXME This is a stopgap and needs to get cleaned up.
*/
#define of_match_v4_t of_match_v3_t
#define of_match_v4_init of_match_v3_init
#define of_match_v4_new of_match_v3_new
#define of_match_v4_to_match of_match_v3_to_match
#define of_match_to_wire_match_v4 of_match_to_wire_match_v3
#define of_match_v4_delete of_match_v3_delete
""")
def gen_match_macros(out):
out.write("""
/**
* Definitions for wildcard macros for OF_VERSION_1_0
*/
""")
for key in match.of_v1_keys:
entry = match.of_match_members[key]
if "v1_wc_shift" in entry:
if key in ["ipv4_src", "ipv4_dst"]:
out.write("""
#define OF_MATCH_V1_WC_%(ku)s_SHIFT %(val)d
#define OF_MATCH_V1_WC_%(ku)s_MASK (0x3f << %(val)d)
#define OF_MATCH_V1_WC_%(ku)s_CLEAR(wc) ((wc) &= ~(0x3f << %(val)d))
#define OF_MATCH_V1_WC_%(ku)s_SET(wc, value) do { \\
OF_MATCH_V1_WC_%(ku)s_CLEAR(wc); \\
((wc) |= (((value) & 0x3f) << %(val)d)); \\
} while (0)
#define OF_MATCH_V1_WC_%(ku)s_TEST(wc) ((wc) & (0x3f << %(val)d))
#define OF_MATCH_V1_WC_%(ku)s_GET(wc) (((wc) >> %(val)d) & 0x3f)
""" % dict(ku=key.upper(), val=entry["v1_wc_shift"]))
else:
out.write("""
#define OF_MATCH_V1_WC_%(ku)s_SHIFT %(val)d
#define OF_MATCH_V1_WC_%(ku)s_MASK (1 << %(val)d)
#define OF_MATCH_V1_WC_%(ku)s_SET(wc) ((wc) |= (1 << %(val)d))
#define OF_MATCH_V1_WC_%(ku)s_CLEAR(wc) ((wc) &= ~(1 << %(val)d))
#define OF_MATCH_V1_WC_%(ku)s_TEST(wc) ((wc) & (1 << %(val)d))
""" % dict(ku=key.upper(), val=entry["v1_wc_shift"]))
out.write("""
/**
* Definitions for wildcard macros for OF_VERSION_1_1
*/
""")
for key in sorted(match.of_v2_keys):
entry = match.of_match_members[key]
if "v2_wc_shift" in entry:
out.write("""
#define OF_MATCH_V2_WC_%(ku)s_SHIFT %(val)d
#define OF_MATCH_V2_WC_%(ku)s_MASK (1 << %(val)d)
#define OF_MATCH_V2_WC_%(ku)s_SET(wc) ((wc) |= (1 << %(val)d))
#define OF_MATCH_V2_WC_%(ku)s_CLEAR(wc) ((wc) &= ~(1 << %(val)d))
#define OF_MATCH_V2_WC_%(ku)s_TEST(wc) ((wc) & (1 << %(val)d))
""" % dict(ku=key.upper(), val=entry["v2_wc_shift"]))
def gen_match_struct(out=sys.stdout):
out.write("/* Unified, flat OpenFlow match structure based on OF 1.2 */\n")
out.write("typedef struct of_match_fields_s {\n")
out.write(" /* Version 1.2 is used for field names */\n")
for name in match.match_keys_sorted:
entry = match.of_match_members[name]
out.write(" %-20s %s;\n" % (entry["m_type"], entry["name"]))
out.write("""
} of_match_fields_t;
/**
* @brief The LOCI match structure.
*/
typedef struct of_match_s {
of_version_t version;
of_match_fields_t fields;
of_match_fields_t masks;
} of_match_t;
/**
* IP Mask map. IP maks wildcards from OF 1.0 are interpretted as
* indices into the map below.
*
* of_ip_mask_map: Array mapping index to mask
* of_ip_mask_use_map: Boolean indication set when map is initialized
* of_ip_mask_map_init: Initialize to default values; set "use map".
*/
#define OF_IP_MASK_MAP_COUNT 64
extern uint32_t of_ip_mask_map[OF_IP_MASK_MAP_COUNT];
extern int of_ip_mask_map_init_done;
#define OF_IP_MASK_INIT_CHECK \
if (!of_ip_mask_map_init_done) of_ip_mask_map_init()
/**
* Initialize map
*/
extern void of_ip_mask_map_init(void);
extern int of_ip_mask_map_set(int index, uint32_t mask);
extern int of_ip_mask_map_get(int index, uint32_t *mask);
/**
* @brief Map from mask to index
*/
extern int of_ip_mask_to_index(uint32_t mask);
/**
* @brief Map from index to mask
*/
extern uint32_t of_ip_index_to_mask(int index);
/**
* The signalling of an untagged packet varies by OF version.
* Use this macro to set the field value.
*/
#define OF_MATCH_UNTAGGED_VLAN_ID(version) \\
((version) == OF_VERSION_1_0 ? 0xffff : \\
((version) == OF_VERSION_1_1 ? 0xffff : 0))
/**
* Version 1.1 had the notion of "any" vlan but must be set
*/
#define OF_MATCH_VLAN_TAG_PRESENT_ANY_ID(version) \\
((version) == OF_VERSION_1_0 ? 0 /* @fixme */ : \\
((version) == OF_VERSION_1_1 ? 0xfffe : 0x1000))
""")
def gen_oxm_defines(out):
"""
Generate verbatim definitions for OXM
"""
out.write("""
/* These are from the OpenFlow 1.2 header file */
/* OXM index values for bitmaps and parsing */
enum of_oxm_index_e {
OF_OXM_INDEX_IN_PORT = 0, /* Switch input port. */
OF_OXM_INDEX_IN_PHY_PORT = 1, /* Switch physical input port. */
OF_OXM_INDEX_METADATA = 2, /* Metadata passed between tables. */
OF_OXM_INDEX_ETH_DST = 3, /* Ethernet destination address. */
OF_OXM_INDEX_ETH_SRC = 4, /* Ethernet source address. */
OF_OXM_INDEX_ETH_TYPE = 5, /* Ethernet frame type. */
OF_OXM_INDEX_VLAN_VID = 6, /* VLAN id. */
OF_OXM_INDEX_VLAN_PCP = 7, /* VLAN priority. */
OF_OXM_INDEX_IP_DSCP = 8, /* IP DSCP (6 bits in ToS field). */
OF_OXM_INDEX_IP_ECN = 9, /* IP ECN (2 bits in ToS field). */
OF_OXM_INDEX_IP_PROTO = 10, /* IP protocol. */
OF_OXM_INDEX_IPV4_SRC = 11, /* IPv4 source address. */
OF_OXM_INDEX_IPV4_DST = 12, /* IPv4 destination address. */
OF_OXM_INDEX_TCP_SRC = 13, /* TCP source port. */
OF_OXM_INDEX_TCP_DST = 14, /* TCP destination port. */
OF_OXM_INDEX_UDP_SRC = 15, /* UDP source port. */
OF_OXM_INDEX_UDP_DST = 16, /* UDP destination port. */
OF_OXM_INDEX_SCTP_SRC = 17, /* SCTP source port. */
OF_OXM_INDEX_SCTP_DST = 18, /* SCTP destination port. */
OF_OXM_INDEX_ICMPV4_TYPE = 19, /* ICMP type. */
OF_OXM_INDEX_ICMPV4_CODE = 20, /* ICMP code. */
OF_OXM_INDEX_ARP_OP = 21, /* ARP opcode. */
OF_OXM_INDEX_ARP_SPA = 22, /* ARP source IPv4 address. */
OF_OXM_INDEX_ARP_TPA = 23, /* ARP target IPv4 address. */
OF_OXM_INDEX_ARP_SHA = 24, /* ARP source hardware address. */
OF_OXM_INDEX_ARP_THA = 25, /* ARP target hardware address. */
OF_OXM_INDEX_IPV6_SRC = 26, /* IPv6 source address. */
OF_OXM_INDEX_IPV6_DST = 27, /* IPv6 destination address. */
OF_OXM_INDEX_IPV6_FLABEL = 28, /* IPv6 Flow Label */
OF_OXM_INDEX_ICMPV6_TYPE = 29, /* ICMPv6 type. */
OF_OXM_INDEX_ICMPV6_CODE = 30, /* ICMPv6 code. */
OF_OXM_INDEX_IPV6_ND_TARGET = 31, /* Target address for ND. */
OF_OXM_INDEX_IPV6_ND_SLL = 32, /* Source link-layer for ND. */
OF_OXM_INDEX_IPV6_ND_TLL = 33, /* Target link-layer for ND. */
OF_OXM_INDEX_MPLS_LABEL = 34, /* MPLS label. */
OF_OXM_INDEX_MPLS_TC = 35, /* MPLS TC. */
};
#define OF_OXM_BIT(index) (((uint64_t) 1) << (index))
/*
* The generic match structure uses the OXM bit indices for it's
* bitmasks for active and masked values
*/
""")
for key, entry in match.of_match_members.items():
out.write("""
/* Mask/value check/set macros for %(key)s */
/**
* Set the mask for an exact match of %(key)s
*/
#define OF_MATCH_MASK_%(ku)s_EXACT_SET(_match) \\
MEMSET(&(_match)->masks.%(key)s, 0xff, \\
sizeof(((_match)->masks).%(key)s))
/**
* Clear the mask for %(key)s making that field inactive for the match
*/
#define OF_MATCH_MASK_%(ku)s_CLEAR(_match) \\
MEMSET(&(_match)->masks.%(key)s, 0, \\
sizeof(((_match)->masks).%(key)s))
/**
* Test whether the match is exact for %(key)s
*/
#define OF_MATCH_MASK_%(ku)s_EXACT_TEST(_match) \\
OF_VARIABLE_IS_ALL_ONES(&(((_match)->masks).%(key)s))
/**
* Test whether key %(key)s is being checked in the match
*/
#define OF_MATCH_MASK_%(ku)s_ACTIVE_TEST(_match) \\
OF_VARIABLE_IS_NON_ZERO(&(((_match)->masks).%(key)s))
""" % dict(key=key, bit=match.oxm_index(key), ku=key.upper()))
def gen_incompat_members(out=sys.stdout):
"""
Generate a macro that lists all the unified fields which are
incompatible with v1 matches
"""
out.write("""
/* Identify bits in unified match that are incompatible with V1, V2 matches */
#define OF_MATCH_V1_INCOMPAT ( (uint64_t)0 """)
for key in match.of_match_members:
if key in match.of_v1_keys:
continue
out.write("\\\n | ((uint64_t)1 << %s)" % match.oxm_index(key))
out.write(")\n\n")
out.write("#define OF_MATCH_V2_INCOMPAT ( (uint64_t)0 ")
for key in match.of_match_members:
if key in match.of_v2_keys:
continue
out.write("\\\n | ((uint64_t)1 << %s)" % match.oxm_index(key))
out.write(""")
/* Indexed by version number */
extern const uint64_t of_match_incompat[4];
""")
# # FIXME: Make these version specific
# def name_to_index(a, name, key="name"):
# """
# Given an array, a, with each entry a dict, and a name,
# find the entry with key matching name and return the index
# """
# count = 0
# for e in a:
# if e[key] == name:
# return count
# count += 1
# return -1
def gen_wc_convert_literal(out):
"""
A bunch of literal C code that's associated with match conversions
@param out The output file handle
"""
out.write("""
/* Some internal macros and utility functions */
/* For counting bits in a uint32 */
#define _VAL_AND_5s(v) ((v) & 0x55555555)
#define _VAL_EVERY_OTHER(v) (_VAL_AND_5s(v) + _VAL_AND_5s(v >> 1))
#define _VAL_AND_3s(v) ((v) & 0x33333333)
#define _VAL_PAIRS(v) (_VAL_AND_3s(v) + _VAL_AND_3s(v >> 2))
#define _VAL_QUADS(v) (((val) + ((val) >> 4)) & 0x0F0F0F0F)
#define _VAL_BYTES(v) ((val) + ((val) >> 8))
/**
* Counts the number of bits set in an integer
*/
static inline int
_COUNT_BITS(unsigned int val)
{
val = _VAL_EVERY_OTHER(val);
val = _VAL_PAIRS(val);
val = _VAL_QUADS(val);
val = _VAL_BYTES(val);
return (val & 0XFF) + ((val >> 16) & 0xFF);
}
/* Indexed by version number */
const uint64_t of_match_incompat[4] = {
-1,
OF_MATCH_V1_INCOMPAT,
OF_MATCH_V2_INCOMPAT,
0
};
""")
def gen_unified_match_to_v1(out):
"""
Generate C code to convert a unified match structure to a V1 match struct
@param out The output file handle
"""
out.write("""
/**
* Check if match is compatible with OF 1.0
* @param match The match being checked
*/
static inline int
of_match_v1_compat_check(of_match_t *match)
{
""")
for key in match.of_match_members:
if key in match.of_v1_keys:
continue
out.write("""
if (OF_MATCH_MASK_%(ku)s_ACTIVE_TEST(match)) {
return 0;
}
""" % dict(ku=key.upper()))
out.write("""
return 1;
}
""")
out.write("""
/**
* Convert a generic match object to an OF_VERSION_1_0 object
* @param src Pointer to the generic match object source
* @param dst Pointer to the OF 1.0 wire structure
*
* The wire structure is initialized by this function if it doesn't
* not have the proper object ID.
*/
int
of_match_to_wire_match_v1(of_match_t *src, of_match_v1_t *dst)
{
of_wc_bmap_t wildcards = 0;
int ip_mask_index;
if ((src == NULL) || (dst == NULL)) {
return OF_ERROR_PARAM;
}
if (!of_match_v1_compat_check(src)) {
return OF_ERROR_COMPAT;
}
if (dst->object_id != OF_MATCH_V1) {
of_match_v1_init(dst, OF_VERSION_1_0, 0, 0);
}
""")
for key in sorted(match.of_v1_keys):
if key in ["ipv4_src", "ipv4_dst"]: # Special cases for masks here
out.write("""
if (OF_MATCH_MASK_%(ku)s_ACTIVE_TEST(src)) {
ip_mask_index = of_ip_mask_to_index(src->masks.%(key)s);
of_match_v1_%(key)s_set(dst, src->fields.%(key)s);
} else { /* Wildcarded, look for 0 mask */
ip_mask_index = of_ip_mask_to_index(0);
}
OF_MATCH_V1_WC_%(ku)s_SET(wildcards, ip_mask_index);
""" % dict(key=key, ku=key.upper()))
else:
out.write("""
if (OF_MATCH_MASK_%(ku)s_ACTIVE_TEST(src)) {
of_match_v1_%(key)s_set(dst, src->fields.%(key)s);
} else {
OF_MATCH_V1_WC_%(ku)s_SET(wildcards);
}
""" % dict(key=key, ku=key.upper()))
out.write("""
of_match_v1_wildcards_set(dst, wildcards);
return OF_ERROR_NONE;
}
""")
def all_ones_mask(d_type):
if d_type == "of_mac_addr_t":
return "of_mac_addr_all_ones"
else:
return "((%s) -1)" % d_type
def gen_unified_match_to_v2(out):
"""
Generate C code to convert a unified match structure to a V2 match struct
@param out The output file handle
"""
out.write("""
/**
* Check if match is compatible with OF 1.0
* @param match The match being checked
*/
static inline int
of_match_v2_compat_check(of_match_t *match)
{
""")
for key in match.of_match_members:
if key in match.of_v2_keys:
continue
out.write("""
if (OF_MATCH_MASK_%(ku)s_ACTIVE_TEST(match)) {
return 0;
}
""" % dict(ku=key.upper()))
out.write("""
return 1;
}
""")
out.write("""
/**
* Convert a generic match object to an OF_VERSION_1_1 object
* @param src Pointer to the generic match object source
* @param dst Pointer to the OF 1.1 wire structure
*
* The wire structure is initialized by this function.
*/
int
of_match_to_wire_match_v2(of_match_t *src, of_match_v2_t *dst)
{
of_wc_bmap_t wildcards = 0;
if ((src == NULL) || (dst == NULL)) {
return OF_ERROR_PARAM;
}
if (!of_match_v2_compat_check(src)) {
return OF_ERROR_COMPAT;
}
if (dst->object_id != OF_MATCH_V2) {
of_match_v2_init(dst, OF_VERSION_1_1, 0, 0);
}
""")
for key in match.of_v2_keys:
if key in match.of_v2_full_mask:
ones_mask = all_ones_mask(match.of_match_members[key]["m_type"])
out.write("""
if (OF_MATCH_MASK_%(ku)s_ACTIVE_TEST(src)) {
if (!OF_MATCH_MASK_%(ku)s_EXACT_TEST(src)) {
of_match_v2_%(key)s_mask_set(dst,
src->masks.%(key)s);
} else { /* Exact match; use all ones mask */
of_match_v2_%(key)s_mask_set(dst,
%(ones_mask)s);
}
of_match_v2_%(key)s_set(dst, src->fields.%(key)s);
}
""" % dict(key=key, ku=key.upper(), ones_mask=ones_mask))
else:
out.write("""
if (!OF_MATCH_MASK_%(ku)s_EXACT_TEST(src)) {
return OF_ERROR_COMPAT;
}
if (OF_MATCH_MASK_%(ku)s_ACTIVE_TEST(src)) {
of_match_v2_%(key)s_set(dst, src->fields.%(key)s);
} else {
OF_MATCH_V2_WC_%(ku)s_SET(wildcards);
}
""" % dict(key=key, ku=key.upper(),
wc_bit="OF_MATCH_WC_V2_%s" % key.upper()))
out.write("""
of_match_v2_wildcards_set(dst, wildcards);
return OF_ERROR_NONE;
}
""")
def gen_unified_match_to_v3(out):
"""
Generate C code to convert a unified match structure to a V3 match
This is much easier as the unified struct is based on V3
@param out The output file handle
"""
out.write("""
static int
populate_oxm_list(of_match_t *src, of_list_oxm_t *oxm_list)
{
of_oxm_t oxm_entry;
/* For each active member, add an OXM entry to the list */
""")
# @fixme Would like to generate the list in some reasonable order
for key, entry in match.of_match_members.items():
out.write("""\
if (OF_MATCH_MASK_%(ku)s_ACTIVE_TEST(src)) {
if (!OF_MATCH_MASK_%(ku)s_EXACT_TEST(src)) {
of_oxm_%(key)s_masked_t *elt;
elt = &oxm_entry.%(key)s_masked;
of_oxm_%(key)s_masked_init(elt,
oxm_list->version, -1, 1);
of_list_oxm_append_bind(oxm_list, &oxm_entry);
of_oxm_%(key)s_masked_value_set(elt,
src->fields.%(key)s);
of_oxm_%(key)s_masked_value_mask_set(elt,
src->masks.%(key)s);
} else { /* Active, but not masked */
of_oxm_%(key)s_t *elt;
elt = &oxm_entry.%(key)s;
of_oxm_%(key)s_init(elt,
oxm_list->version, -1, 1);
of_list_oxm_append_bind(oxm_list, &oxm_entry);
of_oxm_%(key)s_value_set(elt, src->fields.%(key)s);
}
}
""" % dict(key=key, ku=key.upper()))
out.write("""
return OF_ERROR_NONE;
}
/**
* Convert a generic match object to an OF_VERSION_1_2 object
* @param src Pointer to the generic match object source
* @param dst Pointer to the OF 1.2 wire structure
*
* The wire structure is initialized by this function if the object
* id is not correct in the object
*/
int
of_match_to_wire_match_v3(of_match_t *src, of_match_v3_t *dst)
{
int rv = OF_ERROR_NONE;
of_list_oxm_t *oxm_list;
if ((src == NULL) || (dst == NULL)) {
return OF_ERROR_PARAM;
}
if (dst->object_id != OF_MATCH_V3) {
of_match_v3_init(dst, OF_VERSION_1_2, 0, 0);
}
if ((oxm_list = of_list_oxm_new(dst->version)) == NULL) {
return OF_ERROR_RESOURCE;
}
rv = populate_oxm_list(src, oxm_list);
if (rv == OF_ERROR_NONE) {
rv = of_match_v3_oxm_list_set(dst, oxm_list);
}
of_list_oxm_delete(oxm_list);
return rv;
}
""")
def gen_v1_to_unified_match(out):
"""
Generate the code that maps a v1 wire format match object
to a unified match object
"""
# for each v1 member, if not in wildcards
# translate to unified. Treat nw_src/dst specially
out.write("""
/**
* Convert an OF_VERSION_1_0 object to a generic match object
* @param src Pointer to the OF 1.0 wire structure source
* @param dst Pointer to the generic match object destination
*
* The wire structure is initialized by this function.
*/
int
of_match_v1_to_match(of_match_v1_t *src, of_match_t *dst)
{
of_wc_bmap_t wc;
int count;
MEMSET(dst, 0, sizeof(*dst));
dst->version = src->version;
of_match_v1_wildcards_get(src, &wc);
""")
# Deal with nw fields first
out.write("""
/* Handle L3 src and dst wildcarding first */
/* @fixme Check mask values are properly treated for ipv4 src/dst */
if ((count = OF_MATCH_V1_WC_IPV4_DST_GET(wc)) < 32) {
of_match_v1_ipv4_dst_get(src, &dst->fields.ipv4_dst);
if (count > 0) { /* Not exact match */
dst->masks.ipv4_dst = ~(((uint32_t)1 << count) - 1);
} else {
OF_MATCH_MASK_IPV4_DST_EXACT_SET(dst);
}
}
""")
for key in sorted(match.of_v1_keys):
if key in ["ipv4_src", "ipv4_dst"]: # Special cases for masks here
out.write("""
count = OF_MATCH_V1_WC_%(ku)s_GET(wc);
dst->masks.%(key)s = of_ip_index_to_mask(count);
/* @todo Review if we should only get the addr when masks.%(key)s != 0 */
of_match_v1_%(key)s_get(src, &dst->fields.%(key)s);
""" % dict(ku=key.upper(), key=key))
else:
out.write("""
if (!(OF_MATCH_V1_WC_%(ku)s_TEST(wc))) {
of_match_v1_%(key)s_get(src, &dst->fields.%(key)s);
OF_MATCH_MASK_%(ku)s_EXACT_SET(dst);
}
""" % dict(ku=key.upper(), key=key))
out.write("""
return OF_ERROR_NONE;
}
""")
def gen_v2_to_unified_match(out):
"""
Generate the code that maps a v2 wire format match object
to a unified match object
"""
out.write("""
int
of_match_v2_to_match(of_match_v2_t *src, of_match_t *dst)
{
of_wc_bmap_t wc;
MEMSET(dst, 0, sizeof(*dst));
dst->version = src->version;
of_match_v2_wildcards_get(src, &wc);
""")
for key in match.of_v2_keys:
if key in match.of_v2_full_mask:
out.write("""
of_match_v2_%(key)s_mask_get(src, &dst->masks.%(key)s);
if (OF_VARIABLE_IS_NON_ZERO(&dst->masks.%(key)s)) { /* Matching something */
of_match_v2_%(key)s_get(src, &dst->fields.%(key)s);
}
""" % dict(ku=key.upper(), key=key))
else:
out.write("""
if (!(OF_MATCH_V2_WC_%(ku)s_TEST(wc))) {
of_match_v2_%(key)s_get(src, &dst->fields.%(key)s);
OF_MATCH_MASK_%(ku)s_EXACT_SET(dst);
}
""" % dict(ku=key.upper(), key=key))
out.write("""
return OF_ERROR_NONE;
}
""")
def gen_v3_to_unified_match(out):
"""
Generate the code that maps a v3 wire format match object
to a unified match object
"""
# Iterate thru the OXM list members
out.write("""
int
of_match_v3_to_match(of_match_v3_t *src, of_match_t *dst)
{
int rv;
of_list_oxm_t oxm_list;
of_oxm_t oxm_entry;
""")
# for key in match.of_match_members:
# out.write(" of_oxm_%s_t *%s;\n" % (key, key))
# out.write(" of_oxm_%s_masked_t *%s_masked;\n" % (key, key))
out.write("""
MEMSET(dst, 0, sizeof(*dst));
dst->version = src->version;
of_match_v3_oxm_list_bind(src, &oxm_list);
rv = of_list_oxm_first(&oxm_list, &oxm_entry);
while (rv == OF_ERROR_NONE) {
switch (oxm_entry.header.object_id) { /* What kind of entry is this */
""")
for key in match.of_match_members:
out.write("""
case OF_OXM_%(ku)s_MASKED:
of_oxm_%(key)s_masked_value_mask_get(
&oxm_entry.%(key)s_masked,
&dst->masks.%(key)s);
of_oxm_%(key)s_masked_value_get(
&oxm_entry.%(key)s,
&dst->fields.%(key)s);
break;
case OF_OXM_%(ku)s:
OF_MATCH_MASK_%(ku)s_EXACT_SET(dst);
of_oxm_%(key)s_value_get(
&oxm_entry.%(key)s,
&dst->fields.%(key)s);
break;
""" % (dict(ku=key.upper(), key=key)))
out.write("""
default:
/* @fixme Add debug statement */
return OF_ERROR_PARSE;
} /* end switch */
rv = of_list_oxm_next(&oxm_list, &oxm_entry);
} /* end OXM iteration */
return OF_ERROR_NONE;
}
""")
def gen_serialize(out):
out.write("""
/**
* Serialize a match structure according to the version passed
* @param version The version to use for serialization protocol
* @param match Pointer to the structure to serialize
* @param octets Pointer to an octets object to fill out
*
* A buffer is allocated using normal internal ALLOC/FREE semantics
* and pointed to by the octets object. The length of the resulting
* serialization is in octets->bytes.
*
* For 1.2 matches, returns the padded serialized structure
*
* Note that FREE must be called on octets->data when processing of
* the object is complete.
*/
int
of_match_serialize(of_version_t version, of_match_t *match, of_octets_t *octets)
{
int rv;
switch (version) {
""")
for version in of_g.of_version_range:
out.write("""
case %(ver_name)s:
{
of_match_v%(version)s_t *wire_match;
wire_match = of_match_v%(version)s_new(version);
if (wire_match == NULL) {
return OF_ERROR_RESOURCE;
}
if ((rv = of_match_to_wire_match_v%(version)s(match, wire_match)) < 0) {
of_match_v%(version)s_delete(wire_match);
return rv;
}
octets->bytes = OF_MATCH_BYTES(wire_match->length);
of_object_wire_buffer_steal((of_object_t *)wire_match,
&octets->data);
of_match_v%(version)s_delete(wire_match);
}
break;
""" % dict(version=version, ver_name=of_g.of_version_wire2name[version]))
out.write("""
default:
return OF_ERROR_COMPAT;
}
return OF_ERROR_NONE;
}
""")
def gen_deserialize(out):
out.write("""
/**
* Deserialize a match structure according to the version passed
* @param version The version to use for deserialization protocol
* @param match Pointer to the structure to fill out
* @param octets Pointer to an octets object holding serial buffer
*
* Normally the octets object will point to a part of a wire buffer.
*/
int
of_match_deserialize(of_version_t version, of_match_t *match,
of_octets_t *octets)
{
if (octets->bytes == 0) { /* No match specified means all wildcards */
MEMSET(match, 0, sizeof(*match));
match->version = version;
return OF_ERROR_NONE;
}
switch (version) {
""")
for version in of_g.of_version_range:
out.write("""
case %(ver_name)s:
{ /* FIXME: check init bytes */
uint8_t *tmp;
of_match_v%(version)d_t wire_match;
of_match_v%(version)d_init(&wire_match,
%(ver_name)s, -1, 1);
of_object_buffer_bind((of_object_t *)&wire_match,
octets->data, octets->bytes, NULL);
OF_TRY(of_match_v%(version)d_to_match(&wire_match, match));
/* Free the wire buffer control block without freeing
* octets->bytes. */
of_wire_buffer_steal(wire_match.wire_object.wbuf, &tmp);
}
break;
""" % dict(version=version, ver_name=of_g.of_version_wire2name[version]))
out.write("""
default:
return OF_ERROR_COMPAT;
}
return OF_ERROR_NONE;
}
""")
def gen_match_comp(out=sys.stdout):
"""
Generate match comparison functions
"""
out.write("""
/**
* Determine "more specific" relationship between mac addrs
* @return true if v1 is equal to or more specific than v2
*
* @todo Could be optimized
*
* Check: Every bit in v2 is set in v1; v1 may have add'l bits set.
* That is, return false if there is a bit set in v2 and not in v1.
*/
static inline int
of_more_specific_ipv6(of_ipv6_t *v1, of_ipv6_t *v2) {
int idx;
for (idx = 0; idx < OF_IPV6_BYTES; idx++) {
/* If there's a bit set in v2 that is clear in v1, return false */
if (~v1->addr[idx] & v2->addr[idx]) {
return 0;
}
}
return 1;
}
/**
* Boolean test if two values agree when restricted to a mask
*/
static inline int
of_restricted_match_ipv6(of_ipv6_t *v1, of_ipv6_t *v2, of_ipv6_t *mask) {
int idx;
for (idx = 0; idx < OF_IPV6_BYTES; idx++) {
if ((v1->addr[idx] & mask->addr[idx]) !=
(v2->addr[idx] & mask->addr[idx])) {
return 0;
}
}
return 1;
}
/**
* Boolean test if two values "overlap" (agree on common masks)
*/
static inline int
of_overlap_ipv6(of_ipv6_t *v1, of_ipv6_t *v2,
of_ipv6_t *m1, of_ipv6_t *m2) {
int idx;
for (idx = 0; idx < OF_IPV6_BYTES; idx++) {
if (((v1->addr[idx] & m1->addr[idx]) & m2->addr[idx]) !=
((v2->addr[idx] & m1->addr[idx]) & m2->addr[idx])) {
return 0;
}
}
return 1;
}
#define OF_MORE_SPECIFIC_IPV6(v1, v2) of_more_specific_ipv6((v1), (v2))
#define OF_RESTRICTED_MATCH_IPV6(v1, v2, mask) \\
of_restricted_match_ipv6((v1), (v2), (mask))
#define OF_OVERLAP_IPV6(v1, v2, m1, m2) of_overlap_ipv6((v1), (v2), (m1), (m2))
/**
* Determine "more specific" relationship between mac addrs
* @return true if v1 is equal to or more specific than v2
*
* @todo Could be optimized
*
* Check: Every bit in v2 is set in v1; v1 may have add'l bits set.
* That is, return false if there is a bit set in v2 and not in v1.
*/
static inline int
of_more_specific_mac_addr(of_mac_addr_t *v1, of_mac_addr_t *v2) {
int idx;
for (idx = 0; idx < OF_MAC_ADDR_BYTES; idx++) {
/* If there's a bit set in v2 that is clear in v1, return false */
if (~v1->addr[idx] & v2->addr[idx]) {
return 0;
}
}
return 1;
}
/**
* Boolean test if two values agree when restricted to a mask
*/
static inline int
of_restricted_match_mac_addr(of_mac_addr_t *v1, of_mac_addr_t *v2,
of_mac_addr_t *mask) {
int idx;
for (idx = 0; idx < OF_MAC_ADDR_BYTES; idx++) {
if ((v1->addr[idx] & mask->addr[idx]) !=
(v2->addr[idx] & mask->addr[idx])) {
return 0;
}
}
return 1;
}
/**
* Boolean test if two values "overlap" (agree on common masks)
*/
static inline int
of_overlap_mac_addr(of_mac_addr_t *v1, of_mac_addr_t *v2,
of_mac_addr_t *m1, of_mac_addr_t *m2) {
int idx;
for (idx = 0; idx < OF_MAC_ADDR_BYTES; idx++) {
if (((v1->addr[idx] & m1->addr[idx]) & m2->addr[idx]) !=
((v2->addr[idx] & m1->addr[idx]) & m2->addr[idx])) {
return 0;
}
}
return 1;
}
#define OF_MORE_SPECIFIC_MAC_ADDR(v1, v2) of_more_specific_mac_addr((v1), (v2))
#define OF_RESTRICTED_MATCH_MAC_ADDR(v1, v2, mask) \\
of_restricted_match_mac_addr((v1), (v2), (mask))
#define OF_OVERLAP_MAC_ADDR(v1, v2, m1, m2) \\
of_overlap_mac_addr((v1), (v2), (m1), (m2))
/**
* More-specific-than macro for integer types; see above
* @return true if v1 is equal to or more specific than v2
*
* If there is a bit that is set in v2 and not in v1, return false.
*/
#define OF_MORE_SPECIFIC_INT(v1, v2) (!(~(v1) & (v2)))
/**
* Boolean test if two values agree when restricted to a mask
*/
#define OF_RESTRICTED_MATCH_INT(v1, v2, mask) \\
(((v1) & (mask)) == ((v2) & (mask)))
#define OF_OVERLAP_INT(v1, v2, m1, m2) \\
((((v1) & (m1)) & (m2)) == (((v2) & (m1)) & (m2)))
""")
out.write("""
/**
* Compare two match structures for exact equality
*
* We just do memcmp assuming structs were memset to 0 on init
*/
static inline int
of_match_eq(of_match_t *match1, of_match_t *match2)
{
return (MEMCMP(match1, match2, sizeof(of_match_t)) == 0);
}
/**
* Is the entry match more specific than (or equal to) the query match?
* @param entry Match expected to be more specific (subset of query)
* @param query Match expected to be less specific (superset of entry)
* @returns Boolean, see below
*
* The assumption is that a query is being done for a non-strict
* match against an entry in a table. The result is true if the
* entry match indicates a more specific (but compatible) flow space
* specification than that in the query match. This means that the
* values agree between the two where they overlap, and that each mask
* for the entry is more specific than that of the query.
*
* The query has the less specific mask (fewer mask bits) so it is
* used for the mask when checking values.
*/
static inline int
of_match_more_specific(of_match_t *entry, of_match_t *query)
{
of_match_fields_t *q_m, *e_m; /* Short hand for masks, fields */
of_match_fields_t *q_f, *e_f;
q_m = &query->masks;
e_m = &entry->masks;
q_f = &query->fields;
e_f = &entry->fields;
""")
for key, entry in match.of_match_members.items():
q_m = "&q_m->%s" % key
e_m = "&e_m->%s" % key
q_f = "&q_f->%s" % key
e_f = "&e_f->%s" % key
if entry["m_type"] == "of_ipv6_t":
comp = "OF_MORE_SPECIFIC_IPV6"
match_type = "OF_RESTRICTED_MATCH_IPV6"
elif entry["m_type"] == "of_mac_addr_t":
comp = "OF_MORE_SPECIFIC_MAC_ADDR"
match_type = "OF_RESTRICTED_MATCH_MAC_ADDR"
else: # Integer
comp = "OF_MORE_SPECIFIC_INT"
match_type = "OF_RESTRICTED_MATCH_INT"
q_m = "q_m->%s" % key
e_m = "e_m->%s" % key
q_f = "q_f->%s" % key
e_f = "e_f->%s" % key
out.write("""
/* Mask and values for %(key)s */
if (!%(comp)s(%(e_m)s, %(q_m)s)) {
return 0;
}
if (!%(match_type)s(%(e_f)s, %(q_f)s,
%(q_m)s)) {
return 0;
}
""" % dict(match_type=match_type, comp=comp, q_f=q_f, e_f=e_f,
q_m=q_m, e_m=e_m, key=key))
out.write("""
return 1;
}
""")
out.write("""
/**
* Do two entries overlap?
* @param match1 One match struct
* @param match2 Another match struct
* @returns Boolean: true if there is a packet that would match both
*
*/
static inline int
of_match_overlap(of_match_t *match1, of_match_t *match2)
{
of_match_fields_t *m1, *m2; /* Short hand for masks, fields */
of_match_fields_t *f1, *f2;
m1 = &match1->masks;
m2 = &match2->masks;
f1 = &match1->fields;
f2 = &match2->fields;
""")
for key, entry in match.of_match_members.items():
m1 = "&m1->%s" % key
m2 = "&m2->%s" % key
f1 = "&f1->%s" % key
f2 = "&f2->%s" % key
if entry["m_type"] == "of_ipv6_t":
check = "OF_OVERLAP_IPV6"
elif entry["m_type"] == "of_mac_addr_t":
check = "OF_OVERLAP_MAC_ADDR"
else: # Integer
check = "OF_OVERLAP_INT"
m1 = "m1->%s" % key
m2 = "m2->%s" % key
f1 = "f1->%s" % key
f2 = "f2->%s" % key
out.write("""
/* Check overlap for %(key)s */
if (!%(check)s(%(f1)s, %(f2)s,
%(m2)s, %(m1)s)) {
return 0; /* This field differentiates; all done */
}
""" % dict(check=check, f1=f1, f2=f2, m1=m1, m2=m2, key=key))
out.write("""
return 1; /* No field differentiates matches */
}
""")
def gen_match_conversions(out=sys.stdout):
match.match_sanity_check()
gen_wc_convert_literal(out)
out.write("""
/**
* IP Mask map. IP maks wildcards from OF 1.0 are interpretted as
* indices into the map below.
*/
int of_ip_mask_map_init_done = 0;
uint32_t of_ip_mask_map[OF_IP_MASK_MAP_COUNT];
void
of_ip_mask_map_init(void)
{
int idx;
MEMSET(of_ip_mask_map, 0, sizeof(of_ip_mask_map));
for (idx = 0; idx < 32; idx++) {
of_ip_mask_map[idx] = ~((1U << idx) - 1);
}
of_ip_mask_map_init_done = 1;
}
/**
* @brief Set non-default IP mask for given index
*/
int
of_ip_mask_map_set(int index, uint32_t mask)
{
OF_IP_MASK_INIT_CHECK;
if ((index < 0) || (index >= OF_IP_MASK_MAP_COUNT)) {
return OF_ERROR_RANGE;
}
of_ip_mask_map[index] = mask;
return OF_ERROR_NONE;
}
/**
* @brief Get a non-default IP mask for given index
*/
int
of_ip_mask_map_get(int index, uint32_t *mask)
{
OF_IP_MASK_INIT_CHECK;
if ((mask == NULL) || (index < 0) || (index >= OF_IP_MASK_MAP_COUNT)) {
return OF_ERROR_RANGE;
}
*mask = of_ip_mask_map[index];
return OF_ERROR_NONE;
}
/**
* @brief Return the index (used as the WC field in 1.0 match) given the mask
*/
int
of_ip_mask_to_index(uint32_t mask)
{
int idx;
OF_IP_MASK_INIT_CHECK;
/* Handle most common cases directly */
if ((mask == 0) && (of_ip_mask_map[63] == 0)) {
return 63;
}
if ((mask == 0xffffffff) && (of_ip_mask_map[0] == 0xffffffff)) {
return 0;
}
for (idx = 0; idx < OF_IP_MASK_MAP_COUNT; idx++) {
if (mask == of_ip_mask_map[idx]) {
return idx;
}
}
LOCI_LOG_INFO("OF 1.0: Could not map IP addr mask 0x%x", mask);
return 0x3f;
}
/**
* @brief Return the mask for the given index
*/
uint32_t
of_ip_index_to_mask(int index)
{
OF_IP_MASK_INIT_CHECK;
if (index >= OF_IP_MASK_MAP_COUNT) {
LOCI_LOG_INFO("IP index to map: bad index %d", index);
return 0;
}
return of_ip_mask_map[index];
}
""")
gen_unified_match_to_v1(out)
gen_unified_match_to_v2(out)
gen_unified_match_to_v3(out)
gen_v1_to_unified_match(out)
gen_v2_to_unified_match(out)
gen_v3_to_unified_match(out)
return