Merge branch 'master' into net-2.6.25

doc/ip-cref.tex

@@ -298,9 +298,9 @@ Do not use it, if you do not understand what this operation really does.
 
 \vskip 1mm
 \begin{NB}
-The {\tt ip} utility does not change the \verb|PROMISC| 
+The \verb|PROMISC| and \verb|ALLMULTI| flags are considered
-or \verb|ALLMULTI| flags. These flags are considered
+obsolete and should not be changed administratively, though
-obsolete and should not be changed administratively.
+the {\tt ip} utility will allow that.
 \end{NB}
 
 \paragraph{Warning:} If multiple parameter changes are requested,
@@ -450,13 +450,6 @@ or not implemented (\verb|DEBUG|) or specific to some devices
 (\verb|MASTER|, \verb|AUTOMEDIA| and \verb|PORTSEL|). We do not discuss
 them here.
 \end{NB}
-\begin{NB}
-The values of \verb|PROMISC| and \verb|ALLMULTI| flags
-shown by the \verb|ifconfig| utility and by the \verb|ip| utility
-are {\em different\/}. \verb|ip link ls| shows the true device state,
-while \verb|ifconfig| shows the virtual state which was set with
-\verb|ifconfig| itself.
-\end{NB}
 
 
 The second line contains information on the link layer addresses

include/linux/tc_act/tc_nat.h

@@ -0,0 +1,29 @@
+#ifndef __LINUX_TC_NAT_H
+#define __LINUX_TC_NAT_H
+
+#include <linux/pkt_cls.h>
+#include <linux/types.h>
+
+#define TCA_ACT_NAT 9
+
+enum
+{
+	TCA_NAT_UNSPEC,
+	TCA_NAT_PARMS,
+	TCA_NAT_TM,
+	__TCA_NAT_MAX
+};
+#define TCA_NAT_MAX (__TCA_NAT_MAX - 1)
+
+#define TCA_NAT_FLAG_EGRESS 1
+
+struct tc_nat
+{
+	tc_gen;
+	__be32 old_addr;
+	__be32 new_addr;
+	__be32 mask;
+	__u32 flags;
+};
+
+#endif

lib/libnetlink.c

@@ -632,6 +632,6 @@ int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rt
 		rta = RTA_DATA(rta) + RTA_ALIGN(len);
 		return parse_rtattr_nested(tb, max, rta);
 	}
-	memset(tb, 0, sizeof(struct rtattr *) * max);
+	memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
 	return 0;
 }

lib/utils.c

@@ -47,6 +47,48 @@ int get_integer(int *val, const char *arg, int base)
 	return 0;
 }
 
+/* a valid netmask must be 2^n - 1 */
+static int is_valid_netmask(const inet_prefix *addr)
+{
+        uint32_t host;
+
+        if (addr->family != AF_INET)
+                return 0;
+
+        host = ~ntohl(addr->data[0]);
+
+        return (host & (host + 1)) == 0;
+}
+
+static unsigned cidr(const inet_prefix *addr)
+{
+	unsigned bits = 0;
+	u_int32_t mask;
+
+	for (mask = ntohl(addr->data[0]); mask; mask <<= 1)
+		++bits;
+
+	return bits;
+}
+
+static int get_netmask(unsigned *val, const char *arg, int base)
+{
+	inet_prefix addr;
+
+	if (!get_unsigned(val, arg, base))
+		return 0;
+
+	/* try coverting dotted quad to CIDR */
+	if (!get_addr_1(&addr, arg, AF_INET)) {
+		if (is_valid_netmask(&addr))
+			return 0;
+
+	        *val = cidr(&addr);
+	}
+
+	return -1;
+}
+
 int get_unsigned(unsigned *val, const char *arg, int base)
 {
 	unsigned long res;
@@ -304,7 +346,8 @@ int get_prefix_1(inet_prefix *dst, char *arg, int family)
 				dst->bitlen = 32;
 		}
 		if (slash) {
-			if (get_unsigned(&plen, slash+1, 0) || plen > dst->bitlen) {
+			if (get_netmask(&plen, slash+1, 0)
+					|| plen > dst->bitlen) {
 				err = -1;
 				goto done;
 			}

tc/Makefile

@@ -27,6 +27,7 @@ TCMODULES += q_htb.o
 TCMODULES += m_gact.o
 TCMODULES += m_mirred.o
 TCMODULES += m_ipt.o
+TCMODULES += m_nat.o
 TCMODULES += m_pedit.o
 TCMODULES += p_ip.o
 TCMODULES += p_icmp.o

tc/f_fw.c

@@ -40,19 +40,30 @@ static int fw_parse_opt(struct filter_util *qu, char *handle, int argc, char **a
 
 	memset(&tp, 0, sizeof(tp));
 
+	tail = NLMSG_TAIL(n);
+	addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
+
 	if (handle) {
+		char *slash;
+		__u32 mask = 0;
+		if ((slash = strchr(handle, '/')) != NULL)
+			*slash = '\0';
 		if (get_u32(&t->tcm_handle, handle, 0)) {
 			fprintf(stderr, "Illegal \"handle\"\n");
 			return -1;
 		}
+		if (slash) {
+			if (get_u32(&mask, slash+1, 0)) {
+				fprintf(stderr, "Illegal \"handle\" mask\n");
+				return -1;
+			}
+			addattr32(n, MAX_MSG, TCA_FW_MASK, mask);
+		}
 	}
 
 	if (argc == 0)
 		return 0;
 
-	tail = NLMSG_TAIL(n);
-	addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
-
 	while (argc > 0) {
 		if (matches(*argv, "classid") == 0 ||
 		    matches(*argv, "flowid") == 0) {
@@ -111,8 +122,16 @@ static int fw_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u
 
 	parse_rtattr_nested(tb, TCA_FW_MAX, opt);
 
-	if (handle)
+	if (handle || tb[TCA_FW_MASK]) {
-		fprintf(f, "handle 0x%x ", handle);
+		__u32 mark = 0, mask = 0;
+		if(handle)
+			mark = handle;
+		if(tb[TCA_FW_MASK] &&
+		    (mask = *(__u32*)RTA_DATA(tb[TCA_FW_MASK])) != 0xFFFFFFFF)
+			fprintf(f, "handle 0x%x/0x%x ", mark, mask);
+		else
+			fprintf(f, "handle 0x%x ", handle);
+	}
 
 	if (tb[TCA_FW_CLASSID]) {
 		SPRINT_BUF(b1);

tc/m_nat.c

@@ -0,0 +1,213 @@
+/*
+ * m_nat.c		NAT module
+ *
+ *		This program is free software; you can distribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * Authors:	Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <dlfcn.h>
+#include "utils.h"
+#include "tc_util.h"
+#include <linux/tc_act/tc_nat.h>
+
+static void
+explain(void)
+{
+	fprintf(stderr, "Usage: ... nat NAT\n"
+			"NAT := DIRECTION OLD NEW\n"
+			"DIRECTION := { ingress | egress }\n"
+			"OLD := PREFIX\n"
+			"NEW := ADDRESS\n");
+}
+
+static void
+usage(void)
+{
+	explain();
+	exit(-1);
+}
+
+static int
+parse_nat_args(int *argc_p, char ***argv_p,struct tc_nat *sel)
+{
+	int argc = *argc_p;
+	char **argv = *argv_p;
+	inet_prefix addr;
+
+	if (argc <= 0)
+		return -1;
+
+	if (matches(*argv, "egress") == 0)
+		sel->flags |= TCA_NAT_FLAG_EGRESS;
+	else if (matches(*argv, "ingress") != 0)
+		goto bad_val;
+
+	NEXT_ARG();
+
+	if (get_prefix_1(&addr, *argv, AF_INET))
+		goto bad_val;
+
+	sel->old_addr = addr.data[0];
+	sel->mask = htonl(~0u << (32 - addr.bitlen));
+
+	NEXT_ARG();
+
+	if (get_prefix_1(&addr, *argv, AF_INET))
+		goto bad_val;
+
+	sel->new_addr = addr.data[0];
+
+	argc--;
+	argv++;
+
+	*argc_p = argc;
+	*argv_p = argv;
+	return 0;
+
+bad_val:
+	return -1;
+}
+
+static int
+parse_nat(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
+{
+	struct tc_nat sel;
+
+	int argc = *argc_p;
+	char **argv = *argv_p;
+	int ok = 0;
+	struct rtattr *tail;
+
+	memset(&sel, 0, sizeof(sel));
+
+	while (argc > 0) {
+		if (matches(*argv, "nat") == 0) {
+			NEXT_ARG();
+			if (parse_nat_args(&argc, &argv, &sel)) {
+				fprintf(stderr, "Illegal nat construct (%s) \n",
+					*argv);
+				explain();
+				return -1;
+			}
+			ok++;
+			continue;
+		} else if (matches(*argv, "help") == 0) {
+			usage();
+		} else {
+			break;
+		}
+
+	}
+
+	if (!ok) {
+		explain();
+		return -1;
+	}
+
+	if (argc) {
+		if (matches(*argv, "reclassify") == 0) {
+			sel.action = TC_ACT_RECLASSIFY;
+			argc--;
+			argv++;
+		} else if (matches(*argv, "pipe") == 0) {
+			sel.action = TC_ACT_PIPE;
+			argc--;
+			argv++;
+		} else if (matches(*argv, "drop") == 0 ||
+			matches(*argv, "shot") == 0) {
+			sel.action = TC_ACT_SHOT;
+			argc--;
+			argv++;
+		} else if (matches(*argv, "continue") == 0) {
+			sel.action = TC_ACT_UNSPEC;
+			argc--;
+			argv++;
+		} else if (matches(*argv, "pass") == 0) {
+			sel.action = TC_ACT_OK;
+			argc--;
+			argv++;
+		}
+	}
+
+	if (argc) {
+		if (matches(*argv, "index") == 0) {
+			NEXT_ARG();
+			if (get_u32(&sel.index, *argv, 10)) {
+				fprintf(stderr, "Pedit: Illegal \"index\"\n");
+				return -1;
+			}
+			argc--;
+			argv++;
+		}
+	}
+
+	tail = NLMSG_TAIL(n);
+	addattr_l(n, MAX_MSG, tca_id, NULL, 0);
+	addattr_l(n, MAX_MSG, TCA_NAT_PARMS, &sel, sizeof(sel));
+	tail->rta_len = (char *)NLMSG_TAIL(n) - (char *)tail;
+
+	*argc_p = argc;
+	*argv_p = argv;
+	return 0;
+}
+
+static int
+print_nat(struct action_util *au,FILE * f, struct rtattr *arg)
+{
+	struct tc_nat *sel;
+	struct rtattr *tb[TCA_NAT_MAX + 1];
+	char buf1[256];
+	char buf2[256];
+	SPRINT_BUF(buf3);
+	int len;
+
+	if (arg == NULL)
+		return -1;
+
+	parse_rtattr_nested(tb, TCA_NAT_MAX, arg);
+
+	if (tb[TCA_NAT_PARMS] == NULL) {
+		fprintf(f, "[NULL nat parameters]");
+		return -1;
+	}
+	sel = RTA_DATA(tb[TCA_NAT_PARMS]);
+
+	len = ffs(sel->mask);
+	len = len ? 33 - len : 0;
+
+	fprintf(f, " nat %s %s/%d %s %s", sel->flags & TCA_NAT_FLAG_EGRESS ?
+					  "egress" : "ingress",
+		format_host(AF_INET, 4, &sel->old_addr, buf1, sizeof(buf1)),
+		len,
+		format_host(AF_INET, 4, &sel->new_addr, buf2, sizeof(buf2)),
+		action_n2a(sel->action, buf3, sizeof (buf3)));
+
+	if (show_stats) {
+		if (tb[TCA_NAT_TM]) {
+			struct tcf_t *tm = RTA_DATA(tb[TCA_NAT_TM]);
+			print_tm(f,tm);
+		}
+	}
+
+	return 0;
+}
+
+struct action_util nat_action_util = {
+	.id = "nat",
+	.parse_aopt = parse_nat,
+	.print_aopt = print_nat,
+};