[PATCH iproute2 master 4/4] pedit: Introduce ipv6 support

Amir Vadai
2017-05-14T08:17:54Z

Add support for modifying IPv6 headers using pedit.

Signed-off-by: Amir Vadai <amir@vadai.me>
---
man/man8/tc-pedit.8 | 30 ++++++++++++++++++
tc/Makefile | 1 +
tc/m_pedit.c | 43 +++++++++++++++++++++++--
tc/p_ip.c | 17 +---------
tc/p_ip6.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 164 insertions(+), 18 deletions(-)
create mode 100644 tc/p_ip6.c

diff --git a/man/man8/tc-pedit.8 b/man/man8/tc-pedit.8
index 9c4d57b972cc..82d4217bc958 100644
--- a/man/man8/tc-pedit.8
+++ b/man/man8/tc-pedit.8
@@ -33,6 +33,8 @@ pedit - generic packet editor action
|
.BI ip " EX_IPHDR_FIELD"
|
+.BI ip6 " IP6HDR_FIELD"
+|
.BI tcp " TCPHDR_FIELD"
|
.BI udp " UDPHDR_FIELD"
@@ -55,6 +57,12 @@ pedit - generic packet editor action
.IR EX_IPHDR_FIELD " := { "
.BR ttl " }"

+
+.ti -8
+.IR IP6HDR_FIELD " := { "
+.BR src " | " dst " | " flow_lbl " | " payload_len " | " nexthdr " |"
+.BR hoplimit " }"
+
.ti -8
.IR TCPHDR_FIELD " := { "
.BR sport " | " dport " | " flags " }"
@@ -211,6 +219,25 @@ are:
.B ttl
.RE
.TP
+.BI ip6 " IP6HDR_FIELD"
+The supported keywords for
+.I IP6HDR_FIELD
+are:
+.RS
+.TP
+.B src
+.TQ
+.B dst
+.TQ
+.B flow_lbl
+.TQ
+.B payload_len
+.TQ
+.B nexthdr
+.TQ
+.B hoplimit
+.RE
+.TP
.BI tcp " TCPHDR_FIELD"
The supported keywords for
.I TCPHDR_FIELD
@@ -331,6 +358,9 @@ tc filter add dev eth0 parent ffff: u32 \\
action pedit ex munge ip dst set 192.168.1.199
tc filter add dev eth0 parent ffff: u32 \\
match ip sport 22 0xffff \\
+ action pedit ex munge ip6 dst set fe80::dacb:8aff:fec7:320e
+tc filter add dev eth0 parent ffff: u32 \\
+ match ip sport 22 0xffff \\
action pedit ex munge eth dst set 11:22:33:44:55:66
tc filter add dev eth0 parent ffff: u32 \\
match ip dport 23 0xffff \\
diff --git a/tc/Makefile b/tc/Makefile
index 446a11391ad7..9a6bb1ddea57 100644
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -53,6 +53,7 @@ TCMODULES += m_bpf.o
TCMODULES += m_tunnel_key.o
TCMODULES += m_sample.o
TCMODULES += p_ip.o
+TCMODULES += p_ip6.o
TCMODULES += p_icmp.o
TCMODULES += p_eth.o
TCMODULES += p_tcp.o
diff --git a/tc/m_pedit.c b/tc/m_pedit.c
index 9b74c965932e..dfa6b2c4835e 100644
--- a/tc/m_pedit.c
+++ b/tc/m_pedit.c
@@ -257,6 +257,32 @@ static int pack_mac(struct m_pedit_sel *sel, struct m_pedit_key *tkey,
return ret;
}

+static int pack_ipv6(struct m_pedit_sel *sel, struct m_pedit_key *tkey,
+ __u32 *ipv6)
+{
+ int ret = 0;
+ int i;
+
+ if (tkey->off & 0x3) {
+ fprintf(stderr,
+ "pack_ipv6: IPv6 offsets must begin in 32bit boundaries\n");
+ return -1;
+ }
+
+ for (i = 0; i < 4; i++) {
+ tkey->mask = 0;
+ tkey->val = ntohl(ipv6[i]);
+
+ ret = pack_key32(~0, sel, tkey);
+ if (ret)
+ return ret;
+
+ tkey->off += 4;
+ }
+
+ return 0;
+}
+
int parse_val(int *argc_p, char ***argv_p, __u32 *val, int type)
{
int argc = *argc_p;
@@ -281,8 +307,16 @@ int parse_val(int *argc_p, char ***argv_p, __u32 *val, int type)
return 0;
}

- if (type == TIPV6)
- return -1; /* not implemented yet */
+ if (type == TIPV6) {
+ inet_prefix addr;
+
+ if (get_prefix_1(&addr, *argv, AF_INET6))
+ return -1;
+
+ memcpy(val, addr.data, addr.bytelen);
+
+ return 0;
+ }

if (type == TMAC) {
#define MAC_ALEN 6
@@ -364,6 +398,11 @@ int parse_cmd(int *argc_p, char ***argv_p, __u32 len, int type, __u32 retain,
goto done;
}

+ if (type == TIPV6) {
+ res = pack_ipv6(sel, tkey, val);
+ goto done;
+ }
+
tkey->val = *v;
tkey->mask = *m;

diff --git a/tc/p_ip.c b/tc/p_ip.c
index 22fe6505e427..0272a6eaaf48 100644
--- a/tc/p_ip.c
+++ b/tc/p_ip.c
@@ -1,5 +1,5 @@
/*
- * m_pedit.c packet editor: IPV4/6 header
+ * p_ip.c packet editor: IPV4 header
*
* This program is free software; you can distribute it and/or
* modify it under the terms of the GNU General Public License
@@ -156,23 +156,8 @@ done:
return res;
}

-static int
-parse_ip6(int *argc_p, char ***argv_p,
- struct m_pedit_sel *sel, struct m_pedit_key *tkey)
-{
- int res = -1;
- return res;
-}
-
struct m_pedit_util p_pedit_ip = {
NULL,
"ip",
parse_ip,
};
-
-
-struct m_pedit_util p_pedit_ip6 = {
- NULL,
- "ip6",
- parse_ip6,
-};
diff --git a/tc/p_ip6.c b/tc/p_ip6.c
new file mode 100644
index 000000000000..a4824bda90e8
--- /dev/null
+++ b/tc/p_ip6.c
@@ -0,0 +1,91 @@
+/*
+ * p_ip6.c packet editor: IPV6 header
+ *
+ * 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: Amir Vadai <amir@vadai.me>
+ *
+ */
+
+#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 "utils.h"
+#include "tc_util.h"
+#include "m_pedit.h"
+
+static int
+parse_ip6(int *argc_p, char ***argv_p,
+ struct m_pedit_sel *sel, struct m_pedit_key *tkey)
+{
+ int res = -1;
+ int argc = *argc_p;
+ char **argv = *argv_p;
+
+ if (argc < 2)
+ return -1;
+
+ if (!sel->extended)
+ return -1;
+
+ tkey->htype = TCA_PEDIT_KEY_EX_HDR_TYPE_IP6;
+
+ if (strcmp(*argv, "src") == 0) {
+ NEXT_ARG();
+ tkey->off = 8;
+ res = parse_cmd(&argc, &argv, 16, TIPV6, RU32, sel, tkey);
+ goto done;
+ }
+ if (strcmp(*argv, "dst") == 0) {
+ NEXT_ARG();
+ tkey->off = 24;
+ res = parse_cmd(&argc, &argv, 16, TIPV6, RU32, sel, tkey);
+ goto done;
+ }
+ if (strcmp(*argv, "flow_lbl") == 0) {
+ NEXT_ARG();
+ tkey->off = 0;
+ res = parse_cmd(&argc, &argv, 4, TU32, 0x0007ffff, sel, tkey);
+ goto done;
+ }
+ if (strcmp(*argv, "payload_len") == 0) {
+ NEXT_ARG();
+ tkey->off = 4;
+ res = parse_cmd(&argc, &argv, 2, TU32, RU16, sel, tkey);
+ goto done;
+ }
+ if (strcmp(*argv, "nexthdr") == 0) {
+ NEXT_ARG();
+ tkey->off = 6;
+ res = parse_cmd(&argc, &argv, 1, TU32, RU8, sel, tkey);
+ goto done;
+ }
+ if (strcmp(*argv, "hoplimit") == 0) {
+ NEXT_ARG();
+ tkey->off = 7;
+ res = parse_cmd(&argc, &argv, 1, TU32, RU8, sel, tkey);
+ goto done;
+ }
+
+ return -1;
+
+done:
+ *argc_p = argc;
+ *argv_p = argv;
+ return res;
+}
+
+struct m_pedit_util p_pedit_ip6 = {
+ NULL,
+ "ipv6",
+ parse_ip6,
+};
--
2.12.2