* [PATCH libnftnl v4 1/2] src: add ct expectation support
2019-05-31 16:51 [PATCH libnftnl v4 0/2] add ct expectation support Stéphane Veyret
@ 2019-05-31 16:51 ` Stéphane Veyret
2019-05-31 16:51 ` [PATCH libnftnl v4 2/2] examples: add ct expectation examples Stéphane Veyret
` (2 subsequent siblings)
3 siblings, 0 replies; 7+ messages in thread
From: Stéphane Veyret @ 2019-05-31 16:51 UTC (permalink / raw)
To: netfilter-devel; +Cc: Stéphane Veyret
Add support for ct expectation objects, used to define specific expectations.
Signed-off-by: Stéphane Veyret <sveyret@gmail.com>
---
include/libnftnl/object.h | 8 ++
include/linux/netfilter/nf_tables.h | 14 +-
include/obj.h | 8 ++
src/Makefile.am | 1 +
src/obj/ct_expect.c | 213 ++++++++++++++++++++++++++++
src/object.c | 1 +
6 files changed, 244 insertions(+), 1 deletion(-)
create mode 100644 src/obj/ct_expect.c
diff --git a/include/libnftnl/object.h b/include/libnftnl/object.h
index 4ce2230..cce0713 100644
--- a/include/libnftnl/object.h
+++ b/include/libnftnl/object.h
@@ -70,6 +70,14 @@ enum {
NFTNL_OBJ_CT_TIMEOUT_ARRAY,
};
+enum {
+ NFTNL_OBJ_CT_EXPECT_L3PROTO = NFTNL_OBJ_BASE,
+ NFTNL_OBJ_CT_EXPECT_L4PROTO,
+ NFTNL_OBJ_CT_EXPECT_DPORT,
+ NFTNL_OBJ_CT_EXPECT_TIMEOUT,
+ NFTNL_OBJ_CT_EXPECT_SIZE,
+};
+
enum {
NFTNL_OBJ_LIMIT_RATE = NFTNL_OBJ_BASE,
NFTNL_OBJ_LIMIT_UNIT,
diff --git a/include/linux/netfilter/nf_tables.h b/include/linux/netfilter/nf_tables.h
index fd38cdc..7eb8a5b 100644
--- a/include/linux/netfilter/nf_tables.h
+++ b/include/linux/netfilter/nf_tables.h
@@ -1429,6 +1429,17 @@ enum nft_ct_timeout_attributes {
};
#define NFTA_CT_TIMEOUT_MAX (__NFTA_CT_TIMEOUT_MAX - 1)
+enum nft_ct_expectation_attributes {
+ NFTA_CT_EXPECT_UNSPEC,
+ NFTA_CT_EXPECT_L3PROTO,
+ NFTA_CT_EXPECT_L4PROTO,
+ NFTA_CT_EXPECT_DPORT,
+ NFTA_CT_EXPECT_TIMEOUT,
+ NFTA_CT_EXPECT_SIZE,
+ __NFTA_CT_EXPECT_MAX,
+};
+#define NFTA_CT_EXPECT_MAX (__NFTA_CT_EXPECT_MAX - 1)
+
#define NFT_OBJECT_UNSPEC 0
#define NFT_OBJECT_COUNTER 1
#define NFT_OBJECT_QUOTA 2
@@ -1438,7 +1449,8 @@ enum nft_ct_timeout_attributes {
#define NFT_OBJECT_TUNNEL 6
#define NFT_OBJECT_CT_TIMEOUT 7
#define NFT_OBJECT_SECMARK 8
-#define __NFT_OBJECT_MAX 9
+#define NFT_OBJECT_CT_EXPECT 9
+#define __NFT_OBJECT_MAX 10
#define NFT_OBJECT_MAX (__NFT_OBJECT_MAX - 1)
/**
diff --git a/include/obj.h b/include/obj.h
index 35b5c40..9394d79 100644
--- a/include/obj.h
+++ b/include/obj.h
@@ -42,6 +42,13 @@ struct nftnl_obj {
uint8_t l4proto;
uint32_t timeout[NFTNL_CTTIMEOUT_ARRAY_MAX];
} ct_timeout;
+ struct nftnl_obj_ct_expect {
+ uint16_t l3proto;
+ uint16_t dport;
+ uint8_t l4proto;
+ uint8_t size;
+ uint32_t timeout;
+ } ct_expect;
struct nftnl_obj_limit {
uint64_t rate;
uint64_t unit;
@@ -99,6 +106,7 @@ extern struct obj_ops obj_ops_counter;
extern struct obj_ops obj_ops_quota;
extern struct obj_ops obj_ops_ct_helper;
extern struct obj_ops obj_ops_ct_timeout;
+extern struct obj_ops obj_ops_ct_expect;
extern struct obj_ops obj_ops_limit;
extern struct obj_ops obj_ops_tunnel;
extern struct obj_ops obj_ops_secmark;
diff --git a/src/Makefile.am b/src/Makefile.am
index 2d5873f..8f9c022 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -65,4 +65,5 @@ libnftnl_la_SOURCES = utils.c \
obj/limit.c \
obj/ct_timeout.c \
obj/secmark.c \
+ obj/ct_expect.c \
libnftnl.map
diff --git a/src/obj/ct_expect.c b/src/obj/ct_expect.c
new file mode 100644
index 0000000..c0bb5ba
--- /dev/null
+++ b/src/obj/ct_expect.c
@@ -0,0 +1,213 @@
+/*
+ * (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
+ *
+ * This program is free software; you can redistribute 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.
+ */
+
+#include <arpa/inet.h>
+#include <errno.h>
+
+#include <libmnl/libmnl.h>
+
+#include "obj.h"
+
+static int nftnl_obj_ct_expect_set(struct nftnl_obj *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_obj_ct_expect *exp = nftnl_obj_data(e);
+
+ switch (type) {
+ case NFTNL_OBJ_CT_EXPECT_L3PROTO:
+ memcpy(&exp->l3proto, data, sizeof(exp->l3proto));
+ break;
+ case NFTNL_OBJ_CT_EXPECT_L4PROTO:
+ memcpy(&exp->l4proto, data, sizeof(exp->l4proto));
+ break;
+ case NFTNL_OBJ_CT_EXPECT_DPORT:
+ memcpy(&exp->dport, data, sizeof(exp->dport));
+ break;
+ case NFTNL_OBJ_CT_EXPECT_TIMEOUT:
+ memcpy(&exp->timeout, data, sizeof(exp->timeout));
+ break;
+ case NFTNL_OBJ_CT_EXPECT_SIZE:
+ memcpy(&exp->size, data, sizeof(exp->size));
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *nftnl_obj_ct_expect_get(const struct nftnl_obj *e,
+ uint16_t type, uint32_t *data_len)
+{
+ struct nftnl_obj_ct_expect *exp = nftnl_obj_data(e);
+
+ switch (type) {
+ case NFTNL_OBJ_CT_EXPECT_L3PROTO:
+ *data_len = sizeof(exp->l3proto);
+ return &exp->l3proto;
+ case NFTNL_OBJ_CT_EXPECT_L4PROTO:
+ *data_len = sizeof(exp->l4proto);
+ return &exp->l4proto;
+ case NFTNL_OBJ_CT_EXPECT_DPORT:
+ *data_len = sizeof(exp->dport);
+ return &exp->dport;
+ case NFTNL_OBJ_CT_EXPECT_TIMEOUT:
+ *data_len = sizeof(exp->timeout);
+ return &exp->timeout;
+ case NFTNL_OBJ_CT_EXPECT_SIZE:
+ *data_len = sizeof(exp->size);
+ return &exp->size;
+ }
+ return NULL;
+}
+
+static int nftnl_obj_ct_expect_cb(const struct nlattr *attr, void *data)
+{
+ int type = mnl_attr_get_type(attr);
+ const struct nlattr **tb = data;
+
+ if (mnl_attr_type_valid(attr, NFTA_CT_EXPECT_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFTA_CT_EXPECT_L3PROTO:
+ if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
+ abi_breakage();
+ break;
+ case NFTA_CT_EXPECT_L4PROTO:
+ if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
+ abi_breakage();
+ break;
+ case NFTA_CT_EXPECT_DPORT:
+ if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
+ abi_breakage();
+ break;
+ case NFTA_CT_EXPECT_TIMEOUT:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ case NFTA_CT_EXPECT_SIZE:
+ if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nftnl_obj_ct_expect_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
+{
+ struct nftnl_obj_ct_expect *exp = nftnl_obj_data(e);
+
+ if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_L3PROTO))
+ mnl_attr_put_u16(nlh, NFTA_CT_EXPECT_L3PROTO, htons(exp->l3proto));
+ if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_L4PROTO))
+ mnl_attr_put_u8(nlh, NFTA_CT_EXPECT_L4PROTO, exp->l4proto);
+ if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_DPORT))
+ mnl_attr_put_u16(nlh, NFTA_CT_EXPECT_DPORT, htons(exp->dport));
+ if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_TIMEOUT))
+ mnl_attr_put_u32(nlh, NFTA_CT_EXPECT_TIMEOUT, exp->timeout);
+ if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_SIZE))
+ mnl_attr_put_u8(nlh, NFTA_CT_EXPECT_SIZE, exp->size);
+}
+
+static int
+nftnl_obj_ct_expect_parse(struct nftnl_obj *e, struct nlattr *attr)
+{
+ struct nftnl_obj_ct_expect *exp = nftnl_obj_data(e);
+ struct nlattr *tb[NFTA_CT_EXPECT_MAX + 1] = {};
+
+ if (mnl_attr_parse_nested(attr, nftnl_obj_ct_expect_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_CT_EXPECT_L3PROTO]) {
+ exp->l3proto = ntohs(mnl_attr_get_u16(tb[NFTA_CT_EXPECT_L3PROTO]));
+ e->flags |= (1 << NFTNL_OBJ_CT_EXPECT_L3PROTO);
+ }
+ if (tb[NFTA_CT_EXPECT_L4PROTO]) {
+ exp->l4proto = mnl_attr_get_u8(tb[NFTA_CT_EXPECT_L4PROTO]);
+ e->flags |= (1 << NFTNL_OBJ_CT_EXPECT_L4PROTO);
+ }
+ if (tb[NFTA_CT_EXPECT_DPORT]) {
+ exp->dport = ntohs(mnl_attr_get_u16(tb[NFTA_CT_EXPECT_DPORT]));
+ e->flags |= (1 << NFTNL_OBJ_CT_EXPECT_DPORT);
+ }
+ if (tb[NFTA_CT_EXPECT_TIMEOUT]) {
+ exp->timeout = mnl_attr_get_u32(tb[NFTA_CT_EXPECT_TIMEOUT]);
+ e->flags |= (1 << NFTNL_OBJ_CT_EXPECT_TIMEOUT);
+ }
+ if (tb[NFTA_CT_EXPECT_SIZE]) {
+ exp->size = mnl_attr_get_u8(tb[NFTA_CT_EXPECT_SIZE]);
+ e->flags |= (1 << NFTNL_OBJ_CT_EXPECT_SIZE);
+ }
+
+ return 0;
+}
+
+static int nftnl_obj_ct_expect_snprintf_default(char *buf, size_t len,
+ const struct nftnl_obj *e)
+{
+ int ret = 0;
+ int offset = 0, remain = len;
+ struct nftnl_obj_ct_expect *exp = nftnl_obj_data(e);
+
+ if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_L3PROTO)) {
+ ret = snprintf(buf + offset, len, "family %d ", exp->l3proto);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_L4PROTO)) {
+ ret = snprintf(buf + offset, len, "protocol %d ", exp->l4proto);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_DPORT)) {
+ ret = snprintf(buf + offset, len, "dport %d ", exp->dport);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_TIMEOUT)) {
+ ret = snprintf(buf + offset, len, "timeout %d ", exp->timeout);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ if (e->flags & (1 << NFTNL_OBJ_CT_EXPECT_SIZE)) {
+ ret = snprintf(buf + offset, len, "size %d ", exp->size);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+
+ buf[offset] = '\0';
+ return offset;
+}
+
+static int nftnl_obj_ct_expect_snprintf(char *buf, size_t len, uint32_t type,
+ uint32_t flags,
+ const struct nftnl_obj *e)
+{
+ if (len)
+ buf[0] = '\0';
+
+ switch (type) {
+ case NFTNL_OUTPUT_DEFAULT:
+ return nftnl_obj_ct_expect_snprintf_default(buf, len, e);
+ case NFTNL_OUTPUT_JSON:
+ default:
+ break;
+ }
+ return -1;
+}
+
+struct obj_ops obj_ops_ct_expect = {
+ .name = "ct_expect",
+ .type = NFT_OBJECT_CT_EXPECT,
+ .alloc_len = sizeof(struct nftnl_obj_ct_expect),
+ .max_attr = NFTA_CT_EXPECT_MAX,
+ .set = nftnl_obj_ct_expect_set,
+ .get = nftnl_obj_ct_expect_get,
+ .parse = nftnl_obj_ct_expect_parse,
+ .build = nftnl_obj_ct_expect_build,
+ .snprintf = nftnl_obj_ct_expect_snprintf,
+};
diff --git a/src/object.c b/src/object.c
index 5c8d183..d8c87ee 100644
--- a/src/object.c
+++ b/src/object.c
@@ -33,6 +33,7 @@ static struct obj_ops *obj_ops[__NFT_OBJECT_MAX] = {
[NFT_OBJECT_TUNNEL] = &obj_ops_tunnel,
[NFT_OBJECT_CT_TIMEOUT] = &obj_ops_ct_timeout,
[NFT_OBJECT_SECMARK] = &obj_ops_secmark,
+ [NFT_OBJECT_CT_EXPECT] = &obj_ops_ct_expect,
};
static struct obj_ops *nftnl_obj_ops_lookup(uint32_t type)
--
2.21.0
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH libnftnl v4 2/2] examples: add ct expectation examples
2019-05-31 16:51 [PATCH libnftnl v4 0/2] add ct expectation support Stéphane Veyret
2019-05-31 16:51 ` [PATCH libnftnl v4 1/2] src: " Stéphane Veyret
@ 2019-05-31 16:51 ` Stéphane Veyret
2019-06-05 5:54 ` [PATCH libnftnl v4 0/2] add ct expectation support Stéphane Veyret
2019-06-19 11:10 ` Pablo Neira Ayuso
3 siblings, 0 replies; 7+ messages in thread
From: Stéphane Veyret @ 2019-05-31 16:51 UTC (permalink / raw)
To: netfilter-devel; +Cc: Stéphane Veyret
Add examples for ct expectations.
Add, list and delete ct expectation objects from specified table.
Add expectation object to rule.
Signed-off-by: Stéphane Veyret <sveyret@gmail.com>
---
examples/Makefile.am | 16 +++
examples/nft-ct-expectation-add.c | 153 +++++++++++++++++++++++
examples/nft-ct-expectation-del.c | 126 +++++++++++++++++++
examples/nft-ct-expectation-get.c | 142 +++++++++++++++++++++
examples/nft-rule-ct-expectation-add.c | 163 +++++++++++++++++++++++++
5 files changed, 600 insertions(+)
create mode 100644 examples/nft-ct-expectation-add.c
create mode 100644 examples/nft-ct-expectation-del.c
create mode 100644 examples/nft-ct-expectation-get.c
create mode 100644 examples/nft-rule-ct-expectation-add.c
diff --git a/examples/Makefile.am b/examples/Makefile.am
index d044b90..db9164d 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -29,10 +29,14 @@ check_PROGRAMS = nft-table-add \
nft-flowtable-get \
nft-ruleset-get \
nft-compat-get \
+ nft-ct-expectation-add \
+ nft-ct-expectation-del \
+ nft-ct-expectation-get \
nft-ct-helper-add \
nft-ct-helper-get \
nft-ct-helper-del \
nft-rule-ct-helper-add \
+ nft-rule-ct-expectation-add \
nft-rule-ct-timeout-add
nft_table_add_SOURCES = nft-table-add.c
@@ -122,6 +126,15 @@ nft_ruleset_get_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
nft_compat_get_SOURCES = nft-compat-get.c
nft_compat_get_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+nft_ct_expectation_add_SOURCES = nft-ct-expectation-add.c
+nft_ct_expectation_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+
+nft_ct_expectation_del_SOURCES = nft-ct-expectation-del.c
+nft_ct_expectation_del_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+
+nft_ct_expectation_get_SOURCES = nft-ct-expectation-get.c
+nft_ct_expectation_get_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+
nft_ct_helper_add_SOURCES = nft-ct-helper-add.c
nft_ct_helper_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
@@ -134,5 +147,8 @@ nft_ct_helper_del_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
nft_rule_ct_helper_add_SOURCES = nft-rule-ct-helper-add.c
nft_rule_ct_helper_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+nft_rule_ct_expectation_add_SOURCES = nft-rule-ct-expectation-add.c
+nft_rule_ct_expectation_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+
nft_rule_ct_timeout_add_SOURCES = nft-rule-ct-timeout-add.c
nft_rule_ct_timeout_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
diff --git a/examples/nft-ct-expectation-add.c b/examples/nft-ct-expectation-add.c
new file mode 100644
index 0000000..d9b9cdb
--- /dev/null
+++ b/examples/nft-ct-expectation-add.c
@@ -0,0 +1,153 @@
+/*
+ * (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
+ *
+ * This program is free software; you can redistribute 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.
+ */
+
+#include <time.h>
+#include <string.h>
+#include <netinet/in.h>
+
+#include <linux/netfilter.h>
+
+#include <obj.h>
+#include <libmnl/libmnl.h>
+
+static uint16_t parse_family(char *str, const char *option)
+{
+ if (strcmp(str, "ip") == 0)
+ return NFPROTO_IPV4;
+ else if (strcmp(str, "ip6") == 0)
+ return NFPROTO_IPV6;
+ else if (strcmp(str, "inet") == 0)
+ return NFPROTO_INET;
+ else if (strcmp(str, "arp") == 0)
+ return NFPROTO_INET;
+ fprintf(stderr, "Unknown %s: ip, ip6, inet, arp\n", option);
+ exit(EXIT_FAILURE);
+}
+
+static uint8_t parse_l4proto(char *str)
+{
+ if (strcmp(str, "udp") == 0)
+ return IPPROTO_UDP;
+ else if (strcmp(str, "tcp") == 0)
+ return IPPROTO_TCP;
+ else {
+ fprintf(stderr, "Unknown l4proto: tcp, udp\n");
+ exit(EXIT_FAILURE);
+ }
+ return IPPROTO_TCP;
+}
+
+static struct nftnl_obj *obj_parse(int argc, char *argv[])
+{
+ uint16_t family, l3proto, dport;
+ uint8_t l4proto, size;
+ struct nftnl_obj *t;
+ uint32_t timeout;
+
+ t = nftnl_obj_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ return NULL;
+ }
+
+ family = parse_family(argv[1], "family");
+ nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
+ nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_EXPECT);
+ nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
+ nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
+
+ if (argc > 8) {
+ l3proto = parse_family(argv[8], "l3proto");
+ nftnl_obj_set_u16(t, NFTNL_OBJ_CT_EXPECT_L3PROTO, l3proto);
+ }
+ l4proto = parse_l4proto(argv[4]);
+ nftnl_obj_set_u8(t, NFTNL_OBJ_CT_EXPECT_L4PROTO, l4proto);
+ dport = atoi(argv[5]);
+ nftnl_obj_set_u16(t, NFTNL_OBJ_CT_EXPECT_DPORT, dport);
+ timeout = atol(argv[6]);
+ nftnl_obj_set_u32(t, NFTNL_OBJ_CT_EXPECT_TIMEOUT, timeout);
+ size = atoi(argv[7]);
+ nftnl_obj_set_u8(t, NFTNL_OBJ_CT_EXPECT_SIZE, size);
+
+ return t;
+}
+
+int main(int argc, char *argv[])
+{
+ uint32_t portid, seq, obj_seq, family;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ struct mnl_nlmsg_batch *batch;
+ struct mnl_socket *nl;
+ struct nlmsghdr *nlh;
+ struct nftnl_obj *t;
+ int ret;
+
+ if (argc < 8 || argc > 9) {
+ fprintf(stderr, "%s <family> <table> <name> <l4proto> <dport> <timeout> <size> [l3proto]\n", argv[0]);
+ exit(EXIT_FAILURE);
+ }
+
+ t = obj_parse(argc, argv);
+ if (t == NULL) {
+ exit(EXIT_FAILURE);
+ }
+
+ seq = time(NULL);
+ batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
+
+ nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
+ mnl_nlmsg_batch_next(batch);
+
+ obj_seq = seq;
+ family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
+ nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
+ NFT_MSG_NEWOBJ, family,
+ NLM_F_ACK | NLM_F_CREATE, seq++);
+ nftnl_obj_nlmsg_build_payload(nlh, t);
+ nftnl_obj_free(t);
+ mnl_nlmsg_batch_next(batch);
+
+ nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
+ mnl_nlmsg_batch_next(batch);
+
+ nl = mnl_socket_open(NETLINK_NETFILTER);
+ if (nl == NULL) {
+ perror("mnl_socket_open");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+ perror("mnl_socket_bind");
+ exit(EXIT_FAILURE);
+ }
+ portid = mnl_socket_get_portid(nl);
+
+ if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
+ mnl_nlmsg_batch_size(batch)) < 0) {
+ perror("mnl_socket_send");
+ exit(EXIT_FAILURE);
+ }
+
+ mnl_nlmsg_batch_stop(batch);
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ while (ret > 0) {
+ ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
+ if (ret <= 0)
+ break;
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ }
+ if (ret == -1) {
+ perror("error");
+ exit(EXIT_FAILURE);
+ }
+ mnl_socket_close(nl);
+
+ return EXIT_SUCCESS;
+}
diff --git a/examples/nft-ct-expectation-del.c b/examples/nft-ct-expectation-del.c
new file mode 100644
index 0000000..67dbd47
--- /dev/null
+++ b/examples/nft-ct-expectation-del.c
@@ -0,0 +1,126 @@
+/*
+ * (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
+ *
+ * This program is free software; you can redistribute 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.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <netinet/in.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/object.h>
+
+static uint16_t parse_family(char *str, const char *option)
+{
+ if (strcmp(str, "ip") == 0)
+ return NFPROTO_IPV4;
+ else if (strcmp(str, "ip6") == 0)
+ return NFPROTO_IPV6;
+ else if (strcmp(str, "inet") == 0)
+ return NFPROTO_INET;
+ else if (strcmp(str, "arp") == 0)
+ return NFPROTO_INET;
+ fprintf(stderr, "Unknown %s: ip, ip6, inet, arp\n", option);
+ exit(EXIT_FAILURE);
+}
+
+static struct nftnl_obj *obj_parse(int argc, char *argv[])
+{
+ struct nftnl_obj *t;
+ uint16_t family;
+
+ t = nftnl_obj_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ return NULL;
+ }
+
+ family = parse_family(argv[1], "family");
+ nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
+ nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_EXPECT);
+ nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
+ nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
+
+ return t;
+}
+
+int main(int argc, char *argv[])
+{
+ struct mnl_socket *nl;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ struct nlmsghdr *nlh;
+ uint32_t portid, seq, obj_seq, family;
+ struct nftnl_obj *t;
+ struct mnl_nlmsg_batch *batch;
+ int ret;
+
+ if (argc != 4) {
+ fprintf(stderr, "%s <family> <table> <name>\n", argv[0]);
+ exit(EXIT_FAILURE);
+ }
+
+ t = obj_parse(argc, argv);
+ if (t == NULL)
+ exit(EXIT_FAILURE);
+
+ seq = time(NULL);
+ batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
+
+ nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
+ mnl_nlmsg_batch_next(batch);
+
+ obj_seq = seq;
+ family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
+ nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
+ NFT_MSG_DELOBJ, family, NLM_F_ACK,
+ seq++);
+ nftnl_obj_nlmsg_build_payload(nlh, t);
+ mnl_nlmsg_batch_next(batch);
+ nftnl_obj_free(t);
+
+ nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
+ mnl_nlmsg_batch_next(batch);
+
+ nl = mnl_socket_open(NETLINK_NETFILTER);
+ if (nl == NULL) {
+ perror("mnl_socket_open");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+ perror("mnl_socket_bind");
+ exit(EXIT_FAILURE);
+ }
+ portid = mnl_socket_get_portid(nl);
+
+ if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
+ mnl_nlmsg_batch_size(batch)) < 0) {
+ perror("mnl_socket_send");
+ exit(EXIT_FAILURE);
+ }
+
+ mnl_nlmsg_batch_stop(batch);
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ while (ret > 0) {
+ ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
+ if (ret <= 0)
+ break;
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ }
+ if (ret == -1) {
+ perror("error");
+ exit(EXIT_FAILURE);
+ }
+ mnl_socket_close(nl);
+
+ return EXIT_SUCCESS;
+}
diff --git a/examples/nft-ct-expectation-get.c b/examples/nft-ct-expectation-get.c
new file mode 100644
index 0000000..12c1350
--- /dev/null
+++ b/examples/nft-ct-expectation-get.c
@@ -0,0 +1,142 @@
+/*
+ * (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
+ *
+ * This program is free software; you can redistribute 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.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <netinet/in.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/object.h>
+
+static uint16_t parse_family(char *str, const char *option)
+{
+ if (strcmp(str, "ip") == 0)
+ return NFPROTO_IPV4;
+ else if (strcmp(str, "ip6") == 0)
+ return NFPROTO_IPV6;
+ else if (strcmp(str, "inet") == 0)
+ return NFPROTO_INET;
+ else if (strcmp(str, "arp") == 0)
+ return NFPROTO_INET;
+ fprintf(stderr, "Unknown %s: ip, ip6, inet, arp\n", option);
+ exit(EXIT_FAILURE);
+}
+
+static struct nftnl_obj *obj_parse(int argc, char *argv[])
+{
+ struct nftnl_obj *t;
+ uint16_t family;
+
+ t = nftnl_obj_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ return NULL;
+ }
+
+ family = parse_family(argv[1], "family");
+ nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
+ nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_EXPECT);
+ nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
+
+ if (argc > 3)
+ nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
+
+ return t;
+}
+
+static int obj_cb(const struct nlmsghdr *nlh, void *data)
+{
+ uint32_t *type = data;
+ struct nftnl_obj *t;
+ char buf[4096];
+
+ t = nftnl_obj_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ goto err;
+ }
+
+ if (nftnl_obj_nlmsg_parse(nlh, t) < 0) {
+ perror("nftnl_obj_nlmsg_parse");
+ goto err_free;
+ }
+
+ nftnl_obj_snprintf(buf, sizeof(buf), t, *type, 0);
+ printf("%s\n", buf);
+
+err_free:
+ nftnl_obj_free(t);
+err:
+ return MNL_CB_OK;
+}
+
+int main(int argc, char *argv[])
+{
+ struct mnl_socket *nl;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ struct nlmsghdr *nlh;
+ uint32_t portid, seq, family;
+ struct nftnl_obj *t;
+ int ret;
+ uint32_t type = NFTNL_OUTPUT_DEFAULT;
+ uint16_t flags = NLM_F_ACK;
+
+ if (argc < 3 || argc > 4) {
+ fprintf(stderr, "%s <family> <table> [<name>]\n", argv[0]);
+ return EXIT_FAILURE;
+ }
+
+ t = obj_parse(argc, argv);
+ if (t == NULL)
+ exit(EXIT_FAILURE);
+ family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
+
+ seq = time(NULL);
+ if (argc < 4)
+ flags = NLM_F_DUMP;
+ nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETOBJ, family, flags, seq);
+ nftnl_obj_nlmsg_build_payload(nlh, t);
+ nftnl_obj_free(t);
+
+ nl = mnl_socket_open(NETLINK_NETFILTER);
+ if (nl == NULL) {
+ perror("mnl_socket_open");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+ perror("mnl_socket_bind");
+ exit(EXIT_FAILURE);
+ }
+ portid = mnl_socket_get_portid(nl);
+
+ if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+ perror("mnl_socket_send");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ while (ret > 0) {
+ ret = mnl_cb_run(buf, ret, seq, portid, obj_cb, &type);
+ if (ret <= 0)
+ break;
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ }
+ if (ret == -1) {
+ perror("error");
+ exit(EXIT_FAILURE);
+ }
+ mnl_socket_close(nl);
+
+ return EXIT_SUCCESS;
+}
diff --git a/examples/nft-rule-ct-expectation-add.c b/examples/nft-rule-ct-expectation-add.c
new file mode 100644
index 0000000..238e224
--- /dev/null
+++ b/examples/nft-rule-ct-expectation-add.c
@@ -0,0 +1,163 @@
+/*
+ * (C) 2019 by Stéphane Veyret <sveyret@gmail.com>
+ *
+ * This program is free software; you can redistribute 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.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <stddef.h> /* for offsetof */
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <errno.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/rule.h>
+#include <libnftnl/expr.h>
+
+static uint16_t parse_family(char *str, const char *option)
+{
+ if (strcmp(str, "ip") == 0)
+ return NFPROTO_IPV4;
+ else if (strcmp(str, "ip6") == 0)
+ return NFPROTO_IPV6;
+ else if (strcmp(str, "inet") == 0)
+ return NFPROTO_INET;
+ else if (strcmp(str, "arp") == 0)
+ return NFPROTO_INET;
+ fprintf(stderr, "Unknown %s: ip, ip6, inet, arp\n", option);
+ exit(EXIT_FAILURE);
+}
+
+static void add_ct_expect(struct nftnl_rule *r, const char *obj_name)
+{
+ struct nftnl_expr *e;
+
+ e = nftnl_expr_alloc("objref");
+ if (e == NULL) {
+ perror("expr objref oom");
+ exit(EXIT_FAILURE);
+ }
+ nftnl_expr_set_str(e, NFTNL_EXPR_OBJREF_IMM_NAME, obj_name);
+ nftnl_expr_set_u32(e, NFTNL_EXPR_OBJREF_IMM_TYPE, NFT_OBJECT_CT_EXPECT);
+
+ nftnl_rule_add_expr(r, e);
+}
+
+static struct nftnl_rule *setup_rule(uint8_t family, const char *table,
+ const char *chain, const char *handle,
+ const char *obj_name)
+{
+ struct nftnl_rule *r = NULL;
+ uint64_t handle_num;
+
+ r = nftnl_rule_alloc();
+ if (r == NULL) {
+ perror("OOM");
+ exit(EXIT_FAILURE);
+ }
+
+ nftnl_rule_set(r, NFTNL_RULE_TABLE, table);
+ nftnl_rule_set(r, NFTNL_RULE_CHAIN, chain);
+ nftnl_rule_set_u32(r, NFTNL_RULE_FAMILY, family);
+
+ if (handle != NULL) {
+ handle_num = atoll(handle);
+ nftnl_rule_set_u64(r, NFTNL_RULE_POSITION, handle_num);
+ }
+
+ add_ct_expect(r, obj_name);
+
+ return r;
+}
+
+int main(int argc, char *argv[])
+{
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ struct mnl_nlmsg_batch *batch;
+ uint32_t seq = time(NULL);
+ struct mnl_socket *nl;
+ struct nftnl_rule *r;
+ struct nlmsghdr *nlh;
+ uint8_t family;
+ int ret;
+
+ if (argc < 5 || argc > 6) {
+ fprintf(stderr,
+ "Usage: %s <family> <table> <chain> [<handle>] <name>\n",
+ argv[0]);
+ exit(EXIT_FAILURE);
+ }
+ family = parse_family(argv[1], "family");
+
+ if (argc < 6)
+ r = setup_rule(family, argv[2], argv[3], NULL, argv[4]);
+ else
+ r = setup_rule(family, argv[2], argv[3], argv[4], argv[5]);
+
+ nl = mnl_socket_open(NETLINK_NETFILTER);
+ if (nl == NULL) {
+ perror("mnl_socket_open");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+ perror("mnl_socket_bind");
+ exit(EXIT_FAILURE);
+ }
+
+ batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
+
+ nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
+ mnl_nlmsg_batch_next(batch);
+
+ nlh = nftnl_rule_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
+ NFT_MSG_NEWRULE,
+ nftnl_rule_get_u32(r, NFTNL_RULE_FAMILY),
+ NLM_F_APPEND|NLM_F_CREATE|NLM_F_ACK,
+ seq++);
+
+ nftnl_rule_nlmsg_build_payload(nlh, r);
+ nftnl_rule_free(r);
+ mnl_nlmsg_batch_next(batch);
+
+ nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
+ mnl_nlmsg_batch_next(batch);
+
+ ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
+ mnl_nlmsg_batch_size(batch));
+ if (ret == -1) {
+ perror("mnl_socket_sendto");
+ exit(EXIT_FAILURE);
+ }
+
+ mnl_nlmsg_batch_stop(batch);
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ if (ret == -1) {
+ perror("mnl_socket_recvfrom");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
+ if (ret < 0) {
+ perror("mnl_cb_run");
+ exit(EXIT_FAILURE);
+ }
+
+ mnl_socket_close(nl);
+
+ return EXIT_SUCCESS;
+}
--
2.21.0
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