New tc action to send packets to conntrack module, commit
them, and set a zone, labels, mark, and nat on the connection.
It can also clear the packet's conntrack state by using clear.
Usage:
ct clear
ct commit [force] [zone] [mark] [label] [nat]
ct [nat] [zone]
Signed-off-by: Paul Blakey <pa...@mellanox.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leit...@gmail.com>
Signed-off-by: Yossi Kuperman <yoss...@mellanox.com>
Acked-by: Jiri Pirko <j...@mellanox.com>
Acked-by: Roi Dayan <r...@mellanox.com>
---
include/uapi/linux/tc_act/tc_ct.h | 41 ++++
tc/Makefile | 1 +
tc/m_ct.c | 497 ++++++++++++++++++++++++++++++++++++++
tc/tc_util.c | 44 ++++
tc/tc_util.h | 4 +
5 files changed, 587 insertions(+)
create mode 100644 include/uapi/linux/tc_act/tc_ct.h
create mode 100644 tc/m_ct.c
diff --git a/include/uapi/linux/tc_act/tc_ct.h
b/include/uapi/linux/tc_act/tc_ct.h
new file mode 100644
index 0000000..5fb1d7a
--- /dev/null
+++ b/include/uapi/linux/tc_act/tc_ct.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef __UAPI_TC_CT_H
+#define __UAPI_TC_CT_H
+
+#include <linux/types.h>
+#include <linux/pkt_cls.h>
+
+enum {
+ TCA_CT_UNSPEC,
+ TCA_CT_PARMS,
+ TCA_CT_TM,
+ TCA_CT_ACTION, /* u16 */
+ TCA_CT_ZONE, /* u16 */
+ TCA_CT_MARK, /* u32 */
+ TCA_CT_MARK_MASK, /* u32 */
+ TCA_CT_LABELS, /* u128 */
+ TCA_CT_LABELS_MASK, /* u128 */
+ TCA_CT_NAT_IPV4_MIN, /* be32 */
+ TCA_CT_NAT_IPV4_MAX, /* be32 */
+ TCA_CT_NAT_IPV6_MIN, /* struct in6_addr */
+ TCA_CT_NAT_IPV6_MAX, /* struct in6_addr */
+ TCA_CT_NAT_PORT_MIN, /* be16 */
+ TCA_CT_NAT_PORT_MAX, /* be16 */
+ TCA_CT_PAD,
+ __TCA_CT_MAX
+};
+
+#define TCA_CT_MAX (__TCA_CT_MAX - 1)
+
+#define TCA_CT_ACT_COMMIT (1 << 0)
+#define TCA_CT_ACT_FORCE (1 << 1)
+#define TCA_CT_ACT_CLEAR (1 << 2)
+#define TCA_CT_ACT_NAT (1 << 3)
+#define TCA_CT_ACT_NAT_SRC (1 << 4)
+#define TCA_CT_ACT_NAT_DST (1 << 5)
+
+struct tc_ct {
+ tc_gen;
+};
+
+#endif /* __UAPI_TC_CT_H */
diff --git a/tc/Makefile b/tc/Makefile
index 60abdde..973692a 100644
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -52,6 +52,7 @@ TCMODULES += m_ctinfo.o
TCMODULES += m_bpf.o
TCMODULES += m_tunnel_key.o
TCMODULES += m_sample.o
+TCMODULES += m_ct.o
TCMODULES += p_ip.o
TCMODULES += p_ip6.o
TCMODULES += p_icmp.o
diff --git a/tc/m_ct.c b/tc/m_ct.c
new file mode 100644
index 0000000..8589cb9
--- /dev/null
+++ b/tc/m_ct.c
@@ -0,0 +1,497 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* -
+ * m_ct.c Connection tracking action
+ *
+ * Authors: Paul Blakey <pa...@mellanox.com>
+ * Yossi Kuperman <yoss...@mellanox.com>
+ * Marcelo Ricardo Leitner <marcelo.leit...@gmail.com>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include "utils.h"
+#include "tc_util.h"
+#include <linux/tc_act/tc_ct.h>
+
+static void
+usage(void)
+{
+ fprintf(stderr,
+ "Usage: ct clear\n"
+ " ct commit [force] [zone ZONE] [mark MASKED_MARK] [label
MASKED_LABEL] [nat NAT_SPEC]\n"
+ " ct [nat] [zone ZONE]\n"
+ "Where: ZONE is the conntrack zone table number\n"
+ " NAT_SPEC is {src|dst} addr addr1[-addr2] [port
port1[-port2]]\n"
+ "\n");
+ exit(-1);
+}
+
+static int ct_parse_nat_addr_range(const char *str, struct nlmsghdr *n)
+{
+ inet_prefix addr = { .family = AF_UNSPEC, };
+ char *addr1, *addr2 = 0;
+ SPRINT_BUF(buffer);
+ int attr;
+ int ret;
+
+ strncpy(buffer, str, sizeof(buffer) - 1);
+
+ addr1 = buffer;
+ addr2 = strchr(addr1, '-');
+ if (addr2) {
+ *addr2 = '\0';
+ addr2++;
+ }
+
+ ret = get_addr(&addr, addr1, AF_UNSPEC);
+ if (ret)
+ return ret;
+ attr = addr.family == AF_INET ? TCA_CT_NAT_IPV4_MIN :
+ TCA_CT_NAT_IPV6_MIN;
+ addattr_l(n, MAX_MSG, attr, addr.data, addr.bytelen);
+
+ if (addr2) {
+ ret = get_addr(&addr, addr2, addr.family);
+ if (ret)
+ return ret;
+ }
+ attr = addr.family == AF_INET ? TCA_CT_NAT_IPV4_MAX :
+ TCA_CT_NAT_IPV6_MAX;
+ addattr_l(n, MAX_MSG, attr, addr.data, addr.bytelen);
+
+ return 0;
+}
+
+static int ct_parse_nat_port_range(const char *str, struct nlmsghdr *n)
+{
+ char *port1, *port2 = 0;
+ SPRINT_BUF(buffer);
+ __be16 port;
+ int ret;
+
+ strncpy(buffer, str, sizeof(buffer) - 1);
+
+ port1 = buffer;
+ port2 = strchr(port1, '-');
+ if (port2) {
+ *port2 = '\0';
+ port2++;
+ }
+
+ ret = get_be16(&port, port1, 10);
+ if (ret)
+ return -1;
+ addattr16(n, MAX_MSG, TCA_CT_NAT_PORT_MIN, port);
+
+ if (port2) {
+ ret = get_be16(&port, port2, 10);
+ if (ret)
+ return -1;
+ }
+ addattr16(n, MAX_MSG, TCA_CT_NAT_PORT_MAX, port);
+
+ return 0;
+}
+
+
+static int ct_parse_u16(char *str, int value_type, int mask_type,
+ struct nlmsghdr *n)
+{
+ __u16 value, mask;
+ char *slash = 0;
+
+ if (mask_type != TCA_CT_UNSPEC) {
+ slash = strchr(str, '/');
+ if (slash)
+ *slash = '\0';
+ }
+
+ if (get_u16(&value, str, 0))
+ return -1;
+
+ if (slash) {
+ if (get_u16(&mask, slash + 1, 0))
+ return -1;
+ } else {
+ mask = UINT16_MAX;
+ }
+
+ addattr16(n, MAX_MSG, value_type, value);
+ if (mask_type != TCA_CT_UNSPEC)
+ addattr16(n, MAX_MSG, mask_type, mask);
+
+ return 0;
+}
+
+static int ct_parse_u32(char *str, int value_type, int mask_type,
+ struct nlmsghdr *n)
+{
+ __u32 value, mask;
+ char *slash;
+
+ slash = strchr(str, '/');
+ if (slash)
+ *slash = '\0';
+
+ if (get_u32(&value, str, 0))
+ return -1;
+
+ if (slash) {
+ if (get_u32(&mask, slash + 1, 0))
+ return -1;
+ } else {
+ mask = UINT32_MAX;
+ }
+
+ addattr32(n, MAX_MSG, value_type, value);
+ addattr32(n, MAX_MSG, mask_type, mask);
+
+ return 0;
+}
+
+static int ct_parse_mark(char *str, struct nlmsghdr *n)
+{
+ return ct_parse_u32(str, TCA_CT_MARK, TCA_CT_MARK_MASK, n);
+}
+
+static int ct_parse_labels(char *str, struct nlmsghdr *n)
+{
+#define LABELS_SIZE 16
+ uint8_t labels[LABELS_SIZE], lmask[LABELS_SIZE];
+ char *slash, *mask = NULL;
+ size_t slen, slen_mask = 0;
+
+ slash = index(str, '/');
+ if (slash) {
+ *slash = 0;
+ mask = slash+1;
+ slen_mask = strlen(mask);
+ }
+
+ slen = strlen(str);
+ if (slen > LABELS_SIZE*2 || slen_mask > LABELS_SIZE*2) {
+ char errmsg[128];
+
+ snprintf(errmsg, sizeof(errmsg),
+ "%zd Max allowed size %d",
+ slen, LABELS_SIZE*2);
+ invarg(errmsg, str);
+ }
+
+ if (hex2mem(str, labels, slen/2) < 0)
+ invarg("ct: labels must be a hex string\n", str);
+ addattr_l(n, MAX_MSG, TCA_CT_LABELS, labels, slen/2);
+
+ if (mask) {
+ if (hex2mem(mask, lmask, slen_mask/2) < 0)
+ invarg("ct: labels mask must be a hex string\n", mask);
+ } else {
+ memset(lmask, 0xff, sizeof(lmask));
+ slen_mask = sizeof(lmask)*2;
+ }
+ addattr_l(n, MAX_MSG, TCA_CT_LABELS_MASK, lmask, slen_mask/2);
+
+ return 0;
+}
+
+static int
+parse_ct(struct action_util *a, int *argc_p, char ***argv_p, int tca_id,
+ struct nlmsghdr *n)
+{
+ struct tc_ct sel = {};
+ char **argv = *argv_p;
+ struct rtattr *tail;
+ int argc = *argc_p;
+ int ct_action = 0;
+ int ret;
+
+ tail = addattr_nest(n, MAX_MSG, tca_id);
+
+ if (argc && matches(*argv, "ct") == 0)
+ NEXT_ARG_FWD();
+
+ while (argc > 0) {
+ if (matches(*argv, "zone") == 0) {
+ NEXT_ARG();
+
+ if (ct_parse_u16(*argv,
+ TCA_CT_ZONE, TCA_CT_UNSPEC, n)) {
+ fprintf(stderr, "ct: Illegal \"zone\"\n");
+ return -1;
+ }
+ } else if (matches(*argv, "nat") == 0) {
+ ct_action |= TCA_CT_ACT_NAT;
+
+ NEXT_ARG();
+ if (matches(*argv, "src") == 0)
+ ct_action |= TCA_CT_ACT_NAT_SRC;
+ else if (matches(*argv, "dst") == 0)
+ ct_action |= TCA_CT_ACT_NAT_DST;
+ else
+ continue;
+
+ NEXT_ARG();
+ if (matches(*argv, "addr") != 0)
+ usage();
+
+ NEXT_ARG();
+ ret = ct_parse_nat_addr_range(*argv, n);
+ if (ret) {
+ fprintf(stderr, "ct: Illegal nat address
range\n");
+ return -1;
+ }
+
+ NEXT_ARG_FWD();
+ if (matches(*argv, "port") != 0)
+ continue;
+
+ NEXT_ARG();
+ ret = ct_parse_nat_port_range(*argv, n);
+ if (ret) {
+ fprintf(stderr, "ct: Illegal nat port range\n");
+ return -1;
+ }
+ } else if (matches(*argv, "clear") == 0) {
+ ct_action |= TCA_CT_ACT_CLEAR;
+ } else if (matches(*argv, "commit") == 0) {
+ ct_action |= TCA_CT_ACT_COMMIT;
+ } else if (matches(*argv, "force") == 0) {
+ ct_action |= TCA_CT_ACT_FORCE;
+ } else if (matches(*argv, "index") == 0) {
+ NEXT_ARG();
+ if (get_u32(&sel.index, *argv, 10)) {
+ fprintf(stderr, "ct: Illegal \"index\"\n");
+ return -1;
+ }
+ } else if (matches(*argv, "mark") == 0) {
+ NEXT_ARG();
+
+ ret = ct_parse_mark(*argv, n);
+ if (ret) {
+ fprintf(stderr, "ct: Illegal \"mark\"\n");
+ return -1;
+ }
+ } else if (matches(*argv, "label") == 0) {
+ NEXT_ARG();
+
+ ret = ct_parse_labels(*argv, n);
+ if (ret) {
+ fprintf(stderr, "ct: Illegal \"label\"\n");
+ return -1;
+ }
+ } else if (matches(*argv, "help") == 0) {
+ usage();
+ } else {
+ break;
+ }
+ NEXT_ARG_FWD();
+ }
+
+ if (ct_action & TCA_CT_ACT_CLEAR &&
+ ct_action & ~TCA_CT_ACT_CLEAR) {
+ fprintf(stderr, "ct: clear can only be used alone\n");
+ return -1;
+ }
+
+ if (ct_action & TCA_CT_ACT_NAT_SRC &&
+ ct_action & TCA_CT_ACT_NAT_DST) {
+ fprintf(stderr, "ct: src and dst nat can't be used together\n");
+ return -1;
+ }
+
+ if ((ct_action & TCA_CT_ACT_COMMIT) &&
+ (ct_action & TCA_CT_ACT_NAT) &&
+ !(ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST))) {
+ fprintf(stderr, "ct: commit and nat must set src or dst\n");
+ return -1;
+ }
+
+ if (!(ct_action & TCA_CT_ACT_COMMIT) &&
+ (ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST))) {
+ fprintf(stderr, "ct: src or dst is only valid if commit is
set\n");
+ return -1;
+ }
+
+ parse_action_control_dflt(&argc, &argv, &sel.action, false,
+ TC_ACT_PIPE);
+ NEXT_ARG_FWD();
+
+ addattr16(n, MAX_MSG, TCA_CT_ACTION, ct_action);
+ addattr_l(n, MAX_MSG, TCA_CT_PARMS, &sel, sizeof(sel));
+ addattr_nest_end(n, tail);
+
+ *argc_p = argc;
+ *argv_p = argv;
+ return 0;
+}
+
+static int ct_sprint_port(char *buf, const char *prefix, struct rtattr *attr)
+{
+ if (!attr)
+ return 0;
+
+ return sprintf(buf, "%s%d", prefix, rta_getattr_be16(attr));
+}
+
+static int ct_sprint_ip_addr(char *buf, const char *prefix,
+ struct rtattr *attr)
+{
+ int family;
+ size_t len;
+
+ if (!attr)
+ return 0;
+
+ len = RTA_PAYLOAD(attr);
+
+ if (len == 4)
+ family = AF_INET;
+ else if (len == 16)
+ family = AF_INET6;
+ else
+ return 0;
+
+ return sprintf(buf, "%s%s", prefix, rt_addr_n2a_rta(family, attr));
+}
+
+static void ct_print_nat(int ct_action, struct rtattr **tb)
+{
+ size_t done = 0;
+ char out[256] = "";
+ bool nat;
+
+ if (!(ct_action & TCA_CT_ACT_NAT))
+ return;
+
+ if (ct_action & TCA_CT_ACT_NAT_SRC) {
+ nat = true;
+ done += sprintf(out + done, "src");
+ } else if (ct_action & TCA_CT_ACT_NAT_DST) {
+ nat = true;
+ done += sprintf(out + done, "dst");
+ }
+
+ if (nat) {
+ done += ct_sprint_ip_addr(out + done, " addr ",
+ tb[TCA_CT_NAT_IPV4_MIN]);
+ done += ct_sprint_ip_addr(out + done, " addr ",
+ tb[TCA_CT_NAT_IPV6_MIN]);
+ if (tb[TCA_CT_NAT_IPV4_MAX] &&
+ memcmp(RTA_DATA(tb[TCA_CT_NAT_IPV4_MIN]),
+ RTA_DATA(tb[TCA_CT_NAT_IPV4_MAX]), 4))
+ done += ct_sprint_ip_addr(out + done, "-",
+ tb[TCA_CT_NAT_IPV4_MAX]);
+ else if (tb[TCA_CT_NAT_IPV6_MAX] &&
+ memcmp(RTA_DATA(tb[TCA_CT_NAT_IPV6_MIN]),
+ RTA_DATA(tb[TCA_CT_NAT_IPV6_MAX]), 16))
+ done += ct_sprint_ip_addr(out + done, "-",
+ tb[TCA_CT_NAT_IPV6_MAX]);
+ done += ct_sprint_port(out + done, " port ",
+ tb[TCA_CT_NAT_PORT_MIN]);
+ if (tb[TCA_CT_NAT_PORT_MAX] &&
+ memcmp(RTA_DATA(tb[TCA_CT_NAT_PORT_MIN]),
+ RTA_DATA(tb[TCA_CT_NAT_PORT_MAX]), 2))
+ done += ct_sprint_port(out + done, "-",
+ tb[TCA_CT_NAT_PORT_MAX]);
+ }
+
+ if (done)
+ print_string(PRINT_ANY, "nat", " nat %s", out);
+ else
+ print_string(PRINT_ANY, "nat", " nat", "");
+}
+
+static void ct_print_labels(struct rtattr *attr,
+ struct rtattr *mask_attr)
+{
+ const unsigned char *str;
+ bool print_mask = false;
+ char out[256], *p;
+ int data_len, i;
+
+ if (!attr)
+ return;
+
+ data_len = RTA_PAYLOAD(attr);
+ hexstring_n2a(RTA_DATA(attr), data_len, out, sizeof(out));
+ p = out + data_len*2;
+
+ data_len = RTA_PAYLOAD(attr);
+ str = RTA_DATA(mask_attr);
+ if (data_len != 16)
+ print_mask = true;
+ for (i = 0; !print_mask && i < data_len; i++) {
+ if (str[i] != 0xff)
+ print_mask = true;
+ }
+ if (print_mask) {
+ *p++ = '/';
+ hexstring_n2a(RTA_DATA(mask_attr), data_len, p,
+ sizeof(out)-(p-out));
+ p += data_len*2;
+ }
+ *p = '\0';
+
+ print_string(PRINT_ANY, "label", " label %s", out);
+}
+
+static int print_ct(struct action_util *au, FILE *f, struct rtattr *arg)
+{
+ struct rtattr *tb[TCA_CT_MAX + 1];
+ const char *commit;
+ struct tc_ct *p;
+ int ct_action = 0;
+
+ if (arg == NULL)
+ return -1;
+
+ parse_rtattr_nested(tb, TCA_CT_MAX, arg);
+ if (tb[TCA_CT_PARMS] == NULL) {
+ print_string(PRINT_FP, NULL, "%s", "[NULL ct parameters]");
+ return -1;
+ }
+
+ p = RTA_DATA(tb[TCA_CT_PARMS]);
+
+ print_string(PRINT_ANY, "kind", "%s", "ct");
+
+ if (tb[TCA_CT_ACTION])
+ ct_action = rta_getattr_u16(tb[TCA_CT_ACTION]);
+ if (ct_action & TCA_CT_ACT_COMMIT) {
+ commit = ct_action & TCA_CT_ACT_FORCE ?
+ "commit force" : "commit";
+ print_string(PRINT_ANY, "action", " %s", commit);
+ } else if (ct_action & TCA_CT_ACT_CLEAR) {
+ print_string(PRINT_ANY, "action", " %s", "clear");
+ }
+
+ print_masked_u32("mark", tb[TCA_CT_MARK], tb[TCA_CT_MARK_MASK]);
+ print_masked_u16("zone", tb[TCA_CT_ZONE], NULL);
+ ct_print_labels(tb[TCA_CT_LABELS], tb[TCA_CT_LABELS_MASK]);
+ ct_print_nat(ct_action, tb);
+
+ print_action_control(f, " ", p->action, "");
+
+ print_uint(PRINT_ANY, "index", "\n\t index %u", p->index);
+ print_int(PRINT_ANY, "ref", " ref %d", p->refcnt);
+ print_int(PRINT_ANY, "bind", " bind %d", p->bindcnt);
+
+ if (show_stats) {
+ if (tb[TCA_CT_TM]) {
+ struct tcf_t *tm = RTA_DATA(tb[TCA_CT_TM]);
+
+ print_tm(f, tm);
+ }
+ }
+ print_string(PRINT_FP, NULL, "%s", "\n ");
+
+ return 0;
+}
+
+struct action_util ct_action_util = {
+ .id = "ct",
+ .parse_aopt = parse_ct,
+ .print_aopt = print_ct,
+};
diff --git a/tc/tc_util.c b/tc/tc_util.c
index 53d15e0..8e461ba 100644
--- a/tc/tc_util.c
+++ b/tc/tc_util.c
@@ -913,3 +913,47 @@ compat_xstats:
if (tb[TCA_XSTATS] && xstats)
*xstats = tb[TCA_XSTATS];
}
+
+void print_masked_u32(const char *name, struct rtattr *attr,
+ struct rtattr *mask_attr)
+{
+ __u32 value, mask;
+ SPRINT_BUF(namefrm);
+ SPRINT_BUF(out);
+ size_t done;
+
+ if (!attr)
+ return;
+
+ value = rta_getattr_u32(attr);
+ mask = mask_attr ? rta_getattr_u32(mask_attr) : UINT32_MAX;
+
+ done = sprintf(out, "%u", value);
+ if (mask != UINT32_MAX)
+ sprintf(out + done, "/0x%x", mask);
+
+ sprintf(namefrm, " %s %%s", name);
+ print_string(PRINT_ANY, name, namefrm, out);
+}
+
+void print_masked_u16(const char *name, struct rtattr *attr,
+ struct rtattr *mask_attr)
+{
+ __u16 value, mask;
+ SPRINT_BUF(namefrm);
+ SPRINT_BUF(out);
+ size_t done;
+
+ if (!attr)
+ return;
+
+ value = rta_getattr_u16(attr);
+ mask = mask_attr ? rta_getattr_u16(mask_attr) : UINT16_MAX;
+
+ done = sprintf(out, "%u", value);
+ if (mask != UINT16_MAX)
+ sprintf(out + done, "/0x%x", mask);
+
+ sprintf(namefrm, " %s %%s", name);
+ print_string(PRINT_ANY, name, namefrm, out);
+}
diff --git a/tc/tc_util.h b/tc/tc_util.h
index eb4b60d..0c3425a 100644
--- a/tc/tc_util.h
+++ b/tc/tc_util.h
@@ -127,4 +127,8 @@ int action_a2n(char *arg, int *result, bool allow_num);
bool tc_qdisc_block_exists(__u32 block_index);
+void print_masked_u32(const char *name, struct rtattr *attr,
+ struct rtattr *mask_attr);
+void print_masked_u16(const char *name, struct rtattr *attr,
+ struct rtattr *mask_attr);
#endif
--
1.8.3.1
