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@xxxxxxxxx> --- 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@xxxxxxxxx> + * + * 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@xxxxxxxxx> + * + * 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@xxxxxxxxx> + * + * 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@xxxxxxxxx> + * + * 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