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8aa9160274
openwrt/package/network/utils/nftables/patches/201-make-nftables-usable-with-mini-gmp.patch
Steven Barth 8aa9160274 nftables: mini-bump and patch cleanup 
Signed-off-by: Steven Barth <steven@midlink.org>

SVN-Revision: 43710
2014-12-15 09:41:47 +00:00

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From d559314e3e3debe1ff8c2c1372701df6154a53ef Mon Sep 17 00:00:00 2001
From: Steven Barth <steven@midlink.org>
Date: Mon, 15 Dec 2014 10:13:39 +0100
Subject: [PATCH 2/3] build: make nftables usable with mini-gmp
libgmp usually compiles to >400KB which can put a burden on embedded
device firmware especially if libgmp isn't used for other purposes.
mini-gmp in contrast adds only ~30KB to the nft-binary itself.
However mini-gmp does not support gmp_sscanf and gmp_printf.
This patch:
* Adds a configure flag --without-libgmp to select mini-gmp
* Replaces the single gmp_sscanf occurence with mpz_set_str
* Replaces calls to gmp_printf outside of pr_debug with
a minimalistic mpz_printf usable to format one mpz_t
* Replaces gmp_vasprintf in erec_vcreate with vasprintf
and rewrites the single user of the gmp format-flags
* Changes the parser token VERSION to IPHDRVERSION to avoid
clashes with the VERSION-define in config.h
Signed-off-by: Steven Barth <cyrus@openwrt.org>
---
configure.ac | 17 ++++++++++++++---
include/expression.h | 2 +-
include/gmputil.h | 10 ++++++++++
include/utils.h | 3 +--
src/Makefile.am | 4 ++++
src/ct.c | 2 +-
src/datatype.c | 8 +++-----
src/erec.c | 6 +++++-
src/evaluate.c | 8 ++++++--
src/gmputil.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++-
src/parser_bison.y | 6 +++---
src/scanner.l | 2 +-
12 files changed, 102 insertions(+), 20 deletions(-)
diff --git a/configure.ac b/configure.ac
index b55b2b1..1e3729d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -73,8 +73,18 @@ AM_CONDITIONAL([BUILD_PDF], [test "$DBLATEX" == "found"])
PKG_CHECK_MODULES([LIBMNL], [libmnl >= 1.0.3])
PKG_CHECK_MODULES([LIBNFTNL], [libnftnl >= 1.0.2])
-AC_CHECK_LIB([gmp], [__gmpz_init], ,
- AC_MSG_ERROR([No suitable version of libgmp found]))
+AC_ARG_WITH([libgmp], [AS_HELP_STRING([--without-libgmp],
+ [Disable libgmp support (use builtin mini-gmp)])], [],
+ [with_libgmp=yes])
+AS_IF([test "x$with_libgmp" != xno], [
+AC_CHECK_LIB([gmp],[__gmpz_init], , AC_MSG_ERROR([No suitable version of libgmp found]))
+])
+AM_CONDITIONAL([BUILD_MINIGMP], [test "x$with_libgmp" == xno])
+
+
+AS_IF([test "x$with_libgmp" != xyes -a "x$CONFIG_DEBUG" = xy], [
+AC_MSG_ERROR([--without-libgmp MUST be used with --disable-debug])
+])
AC_ARG_WITH([cli], [AS_HELP_STRING([--without-cli],
[disable interactive CLI (libreadline support)])],
@@ -130,4 +140,5 @@ AC_OUTPUT
echo "
nft configuration:
cli support: ${with_cli}
- enable debugging: ${with_debug}"
+ enable debugging: ${with_debug}
+ use shared libgmp: ${with_libgmp}"
diff --git a/include/expression.h b/include/expression.h
index 4b96879..7477c3e 100644
--- a/include/expression.h
+++ b/include/expression.h
@@ -2,7 +2,7 @@
#define NFTABLES_EXPRESSION_H
#include <stdbool.h>
-#include <gmp.h>
+#include <gmputil.h>
#include <linux/netfilter/nf_tables.h>
#include <nftables.h>
diff --git a/include/gmputil.h b/include/gmputil.h
index 63eb0ba..b9ced6d 100644
--- a/include/gmputil.h
+++ b/include/gmputil.h
@@ -1,9 +1,17 @@
#ifndef NFTABLES_GMPUTIL_H
#define NFTABLES_GMPUTIL_H
+#include <config.h>
+
+#ifdef HAVE_LIBGMP
#include <gmp.h>
+#else
+#include <mini-gmp.h>
+#endif
+
#include <asm/byteorder.h>
+
enum mpz_word_order {
MPZ_MSWF = 1,
MPZ_LSWF = -1,
@@ -48,4 +56,6 @@ extern void mpz_import_data(mpz_t rop, const void *data,
unsigned int len);
extern void mpz_switch_byteorder(mpz_t rop, unsigned int len);
+extern int mpz_printf(const char *format, const mpz_t value);
+
#endif /* NFTABLES_GMPUTIL_H */
diff --git a/include/utils.h b/include/utils.h
index 15b2e39..3c436ba 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -9,14 +9,13 @@
#include <unistd.h>
#include <assert.h>
#include <list.h>
-#include <gmp.h>
#define BITS_PER_BYTE 8
#ifdef DEBUG
#define pr_debug(fmt, arg...) gmp_printf(fmt, ##arg)
#else
-#define pr_debug(fmt, arg...) ({ if (false) gmp_printf(fmt, ##arg); 0; })
+#define pr_debug(fmt, arg...) ({ if (false) {}; 0; })
#endif
#define __fmtstring(x, y) __attribute__((format(printf, x, y)))
diff --git a/src/Makefile.am b/src/Makefile.am
index 378424d..099052a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -51,4 +51,8 @@ if BUILD_CLI
nft_SOURCES += cli.c
endif
+if BUILD_MINIGMP
+nft_SOURCES += mini-gmp.c
+endif
+
nft_LDADD = ${LIBMNL_LIBS} ${LIBNFTNL_LIBS}
diff --git a/src/ct.c b/src/ct.c
index 2eb85ea..759e65d 100644
--- a/src/ct.c
+++ b/src/ct.c
@@ -110,7 +110,7 @@ static void ct_label_type_print(const struct expr *expr)
return;
}
/* can happen when connlabel.conf is altered after rules were added */
- gmp_printf("0x%Zx", expr->value);
+ mpz_printf("0x%Zx", expr->value);
}
static struct error_record *ct_label_type_parse(const struct expr *sym,
diff --git a/src/datatype.c b/src/datatype.c
index 4519d87..40ce898 100644
--- a/src/datatype.c
+++ b/src/datatype.c
@@ -186,7 +186,7 @@ void symbol_table_print(const struct symbol_table *tbl,
static void invalid_type_print(const struct expr *expr)
{
- gmp_printf("0x%Zx [invalid type]", expr->value);
+ mpz_printf("0x%Zx [invalid type]", expr->value);
}
const struct datatype invalid_type = {
@@ -268,18 +268,16 @@ static void integer_type_print(const struct expr *expr)
if (expr->dtype->basefmt != NULL)
fmt = expr->dtype->basefmt;
- gmp_printf(fmt, expr->value);
+ mpz_printf(fmt, expr->value);
}
static struct error_record *integer_type_parse(const struct expr *sym,
struct expr **res)
{
mpz_t v;
- int len;
mpz_init(v);
- if (gmp_sscanf(sym->identifier, "%Zu%n", v, &len) != 1 ||
- (int)strlen(sym->identifier) != len) {
+ if (mpz_set_str(v, sym->identifier, 0)) {
mpz_clear(v);
return error(&sym->location, "Could not parse %s",
sym->dtype->desc);
diff --git a/src/erec.c b/src/erec.c
index 82543e6..810e9bf 100644
--- a/src/erec.c
+++ b/src/erec.c
@@ -44,6 +44,7 @@ static void erec_destroy(struct error_record *erec)
xfree(erec);
}
+__attribute__((format(printf, 3, 0)))
struct error_record *erec_vcreate(enum error_record_types type,
const struct location *loc,
const char *fmt, va_list ap)
@@ -55,10 +56,13 @@ struct error_record *erec_vcreate(enum error_record_types type,
erec->num_locations = 0;
erec_add_location(erec, loc);
- gmp_vasprintf(&erec->msg, fmt, ap);
+ if (vasprintf(&erec->msg, fmt, ap) < 0)
+ erec->msg = NULL;
+
return erec;
}
+__attribute__((format(printf, 3, 4)))
struct error_record *erec_create(enum error_record_types type,
const struct location *loc,
const char *fmt, ...)
diff --git a/src/evaluate.c b/src/evaluate.c
index 0732660..3cb5cca 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -232,9 +232,13 @@ static int expr_evaluate_value(struct eval_ctx *ctx, struct expr **expr)
case TYPE_INTEGER:
mpz_init_bitmask(mask, ctx->ectx.len);
if (mpz_cmp((*expr)->value, mask) > 0) {
+ char *valstr = mpz_get_str(NULL, 10, (*expr)->value);
+ char *rangestr = mpz_get_str(NULL, 10, mask);
expr_error(ctx->msgs, *expr,
- "Value %Zu exceeds valid range 0-%Zu",
- (*expr)->value, mask);
+ "Value %s exceeds valid range 0-%s",
+ valstr, rangestr);
+ free(valstr);
+ free(rangestr);
mpz_clear(mask);
return -1;
}
diff --git a/src/gmputil.c b/src/gmputil.c
index cb46445..acbf369 100644
--- a/src/gmputil.c
+++ b/src/gmputil.c
@@ -14,7 +14,6 @@
#include <stdio.h>
#include <unistd.h>
#include <string.h>
-#include <gmp.h>
#include <nftables.h>
#include <datatype.h>
@@ -148,6 +147,59 @@ void mpz_switch_byteorder(mpz_t rop, unsigned int len)
mpz_import_data(rop, data, BYTEORDER_HOST_ENDIAN, len);
}
+int mpz_printf(const char *f, const mpz_t value)
+{
+ /* minimalistic gmp_printf replacement to format a single mpz_t
+ * using only mini-gmp functions */
+ int n = 0;
+ while (*f) {
+ if (*f != '%') {
+ if (fputc(*f, stdout) != *f)
+ return -1;
+
+ ++n;
+ } else {
+ unsigned long prec = 0;
+ int base;
+ size_t len;
+ char *str;
+ bool ok;
+
+ if (*++f == '.')
+ prec = strtoul(++f, (char**)&f, 10);
+
+ if (*f++ != 'Z')
+ return -1;
+
+ if (*f == 'u')
+ base = 10;
+ else if (*f == 'x')
+ base = 16;
+ else
+ return -1;
+
+ len = mpz_sizeinbase(value, base);
+ while (prec-- > len) {
+ if (fputc('0', stdout) != '0')
+ return -1;
+
+ ++n;
+ }
+
+ str = mpz_get_str(NULL, base, value);
+ ok = str && fwrite(str, 1, len, stdout) == len;
+ free(str);
+
+ if (!ok)
+ return -1;
+
+ n += len;
+ }
+ ++f;
+ }
+ return n;
+}
+
static void *gmp_xrealloc(void *ptr, size_t old_size, size_t new_size)
{
return xrealloc(ptr, new_size);
diff --git a/src/parser_bison.y b/src/parser_bison.y
index 99dbd08..eb5cf90 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -237,7 +237,7 @@ static void location_update(struct location *loc, struct location *rhs, int n)
%token OPERATION "operation"
%token IP "ip"
-%token VERSION "version"
+%token IPHDRVERSION "version"
%token HDRLENGTH "hdrlength"
%token TOS "tos"
%token LENGTH "length"
@@ -1947,7 +1947,7 @@ ip_hdr_expr : IP ip_hdr_field
}
;
-ip_hdr_field : VERSION { $$ = IPHDR_VERSION; }
+ip_hdr_field : IPHDRVERSION { $$ = IPHDR_VERSION; }
| HDRLENGTH { $$ = IPHDR_HDRLENGTH; }
| TOS { $$ = IPHDR_TOS; }
| LENGTH { $$ = IPHDR_LENGTH; }
@@ -1994,7 +1994,7 @@ ip6_hdr_expr : IP6 ip6_hdr_field
}
;
-ip6_hdr_field : VERSION { $$ = IP6HDR_VERSION; }
+ip6_hdr_field : IPHDRVERSION { $$ = IP6HDR_VERSION; }
| PRIORITY { $$ = IP6HDR_PRIORITY; }
| FLOWLABEL { $$ = IP6HDR_FLOWLABEL; }
| LENGTH { $$ = IP6HDR_LENGTH; }
diff --git a/src/scanner.l b/src/scanner.l
index ed87da6..92b6a10 100644
--- a/src/scanner.l
+++ b/src/scanner.l
@@ -349,7 +349,7 @@ addrstring ({macaddr}|{ip4addr}|{ip6addr})
"operation" { return OPERATION; }
"ip" { return IP; }
-"version" { return VERSION; }
+"version" { return IPHDRVERSION; }
"hdrlength" { return HDRLENGTH; }
"tos" { return TOS; }
"length" { return LENGTH; }
--
2.1.3
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