@@ -17295,6 +17295,7 @@ T: git https://github.com/OpenVPN/linux-kernel-ovpn.git
F: Documentation/netlink/specs/ovpn.yaml
F: drivers/net/ovpn/
F: include/uapi/linux/ovpn.h
+F: tools/testing/selftests/net/ovpn/
OPENVSWITCH
M: Pravin B Shelar <pshelar@ovn.org>
@@ -68,6 +68,7 @@ TARGETS += net/hsr
TARGETS += net/mptcp
TARGETS += net/netfilter
TARGETS += net/openvswitch
+TARGETS += net/ovpn
TARGETS += net/packetdrill
TARGETS += net/rds
TARGETS += net/tcp_ao
new file mode 100644
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0+
+ovpn-cli
new file mode 100644
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2020-2024 OpenVPN, Inc.
+#
+CFLAGS = -pedantic -Wextra -Wall -Wl,--no-as-needed -g -O0 -ggdb $(KHDR_INCLUDES)
+CFLAGS += $(shell pkg-config --cflags libnl-3.0 libnl-genl-3.0)
+
+LDFLAGS = -lmbedtls -lmbedcrypto
+LDFLAGS += $(shell pkg-config --libs libnl-3.0 libnl-genl-3.0)
+
+TEST_PROGS = test.sh \
+ test-chachapoly.sh \
+ test-tcp.sh \
+ test-float.sh
+
+TEST_GEN_FILES = ovpn-cli
+
+include ../../lib.mk
new file mode 100644
@@ -0,0 +1,10 @@
+CONFIG_NET=y
+CONFIG_INET=y
+CONFIG_STREAM_PARSER=y
+CONFIG_NET_UDP_TUNNEL=y
+CONFIG_DST_CACHE=y
+CONFIG_CRYPTO=y
+CONFIG_CRYPTO_AES=y
+CONFIG_CRYPTO_GCM=y
+CONFIG_CRYPTO_CHACHA20POLY1305=y
+CONFIG_OVPN=m
new file mode 100644
@@ -0,0 +1,5 @@
+jRqMACN7d7/aFQNT8S7jkrBD8uwrgHbG5OQZP2eu4R1Y7tfpS2bf5RHv06Vi163CGoaIiTX99R3B
+ia9ycAH8Wz1+9PWv51dnBLur9jbShlgZ2QHLtUc4a/gfT7zZwULXuuxdLnvR21DDeMBaTbkgbai9
+uvAa7ne1liIgGFzbv+Bas4HDVrygxIxuAnP5Qgc3648IJkZ0QEXPF+O9f0n5+QIvGCxkAUVx+5K6
+KIs+SoeWXnAopELmoGSjUpFtJbagXK82HfdqpuUxT2Tnuef0/14SzVE/vNleBNu2ZbyrSAaah8tE
+BofkPJUBFY+YQcfZNM5Dgrw3i+Bpmpq/gpdg5w==
new file mode 100644
@@ -0,0 +1,2370 @@
+// SPDX-License-Identifier: GPL-2.0
+/* OpenVPN data channel accelerator
+ *
+ * Copyright (C) 2020-2024 OpenVPN, Inc.
+ *
+ * Author: Antonio Quartulli <antonio@openvpn.net>
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <time.h>
+
+#include <linux/ovpn.h>
+#include <linux/types.h>
+#include <linux/netlink.h>
+
+#include <netlink/socket.h>
+#include <netlink/netlink.h>
+#include <netlink/genl/genl.h>
+#include <netlink/genl/family.h>
+#include <netlink/genl/ctrl.h>
+
+#include <mbedtls/base64.h>
+#include <mbedtls/error.h>
+
+#include <sys/socket.h>
+
+/* defines to make checkpatch happy */
+#define strscpy strncpy
+#define __always_unused __attribute__((__unused__))
+
+/* libnl < 3.5.0 does not set the NLA_F_NESTED on its own, therefore we
+ * have to explicitly do it to prevent the kernel from failing upon
+ * parsing of the message
+ */
+#define nla_nest_start(_msg, _type) \
+ nla_nest_start(_msg, (_type) | NLA_F_NESTED)
+
+uint64_t nla_get_uint(struct nlattr *attr)
+{
+ if (nla_len(attr) == sizeof(uint32_t))
+ return nla_get_u32(attr);
+ else
+ return nla_get_u64(attr);
+}
+
+typedef int (*ovpn_nl_cb)(struct nl_msg *msg, void *arg);
+
+enum ovpn_key_direction {
+ KEY_DIR_IN = 0,
+ KEY_DIR_OUT,
+};
+
+#define KEY_LEN (256 / 8)
+#define NONCE_LEN 8
+
+#define PEER_ID_UNDEF 0x00FFFFFF
+
+struct nl_ctx {
+ struct nl_sock *nl_sock;
+ struct nl_msg *nl_msg;
+ struct nl_cb *nl_cb;
+
+ int ovpn_dco_id;
+};
+
+enum ovpn_cmd {
+ CMD_INVALID,
+ CMD_NEW_IFACE,
+ CMD_DEL_IFACE,
+ CMD_LISTEN,
+ CMD_CONNECT,
+ CMD_NEW_PEER,
+ CMD_NEW_MULTI_PEER,
+ CMD_SET_PEER,
+ CMD_DEL_PEER,
+ CMD_GET_PEER,
+ CMD_NEW_KEY,
+ CMD_DEL_KEY,
+ CMD_GET_KEY,
+ CMD_SWAP_KEYS,
+ CMD_LISTEN_MCAST,
+};
+
+struct ovpn_ctx {
+ enum ovpn_cmd cmd;
+
+ __u8 key_enc[KEY_LEN];
+ __u8 key_dec[KEY_LEN];
+ __u8 nonce[NONCE_LEN];
+
+ enum ovpn_cipher_alg cipher;
+
+ sa_family_t sa_family;
+
+ unsigned long peer_id;
+ unsigned long lport;
+
+ union {
+ struct sockaddr_in in4;
+ struct sockaddr_in6 in6;
+ } remote;
+
+ union {
+ struct sockaddr_in in4;
+ struct sockaddr_in6 in6;
+ } peer_ip;
+
+ bool peer_ip_set;
+
+ unsigned int ifindex;
+ char ifname[IFNAMSIZ];
+ enum ovpn_mode mode;
+ bool mode_set;
+
+ int socket;
+ int cli_socket;
+
+ __u32 keepalive_interval;
+ __u32 keepalive_timeout;
+
+ enum ovpn_key_direction key_dir;
+ enum ovpn_key_slot key_slot;
+ int key_id;
+
+ const char *peers_file;
+};
+
+static int ovpn_nl_recvmsgs(struct nl_ctx *ctx)
+{
+ int ret;
+
+ ret = nl_recvmsgs(ctx->nl_sock, ctx->nl_cb);
+
+ switch (ret) {
+ case -NLE_INTR:
+ fprintf(stderr,
+ "netlink received interrupt due to signal - ignoring\n");
+ break;
+ case -NLE_NOMEM:
+ fprintf(stderr, "netlink out of memory error\n");
+ break;
+ case -NLE_AGAIN:
+ fprintf(stderr,
+ "netlink reports blocking read - aborting wait\n");
+ break;
+ default:
+ if (ret)
+ fprintf(stderr, "netlink reports error (%d): %s\n",
+ ret, nl_geterror(-ret));
+ break;
+ }
+
+ return ret;
+}
+
+static struct nl_ctx *nl_ctx_alloc_flags(struct ovpn_ctx *ovpn, int cmd,
+ int flags)
+{
+ struct nl_ctx *ctx;
+ int err, ret;
+
+ ctx = calloc(1, sizeof(*ctx));
+ if (!ctx)
+ return NULL;
+
+ ctx->nl_sock = nl_socket_alloc();
+ if (!ctx->nl_sock) {
+ fprintf(stderr, "cannot allocate netlink socket\n");
+ goto err_free;
+ }
+
+ nl_socket_set_buffer_size(ctx->nl_sock, 8192, 8192);
+
+ ret = genl_connect(ctx->nl_sock);
+ if (ret) {
+ fprintf(stderr, "cannot connect to generic netlink: %s\n",
+ nl_geterror(ret));
+ goto err_sock;
+ }
+
+ /* enable Extended ACK for detailed error reporting */
+ err = 1;
+ setsockopt(nl_socket_get_fd(ctx->nl_sock), SOL_NETLINK, NETLINK_EXT_ACK,
+ &err, sizeof(err));
+
+ ctx->ovpn_dco_id = genl_ctrl_resolve(ctx->nl_sock, OVPN_FAMILY_NAME);
+ if (ctx->ovpn_dco_id < 0) {
+ fprintf(stderr, "cannot find ovpn_dco netlink component: %d\n",
+ ctx->ovpn_dco_id);
+ goto err_free;
+ }
+
+ ctx->nl_msg = nlmsg_alloc();
+ if (!ctx->nl_msg) {
+ fprintf(stderr, "cannot allocate netlink message\n");
+ goto err_sock;
+ }
+
+ ctx->nl_cb = nl_cb_alloc(NL_CB_DEFAULT);
+ if (!ctx->nl_cb) {
+ fprintf(stderr, "failed to allocate netlink callback\n");
+ goto err_msg;
+ }
+
+ nl_socket_set_cb(ctx->nl_sock, ctx->nl_cb);
+
+ genlmsg_put(ctx->nl_msg, 0, 0, ctx->ovpn_dco_id, 0, flags, cmd, 0);
+
+ if (ovpn->ifindex > 0)
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_IFINDEX, ovpn->ifindex);
+
+ return ctx;
+nla_put_failure:
+err_msg:
+ nlmsg_free(ctx->nl_msg);
+err_sock:
+ nl_socket_free(ctx->nl_sock);
+err_free:
+ free(ctx);
+ return NULL;
+}
+
+static struct nl_ctx *nl_ctx_alloc(struct ovpn_ctx *ovpn, int cmd)
+{
+ return nl_ctx_alloc_flags(ovpn, cmd, 0);
+}
+
+static void nl_ctx_free(struct nl_ctx *ctx)
+{
+ if (!ctx)
+ return;
+
+ nl_socket_free(ctx->nl_sock);
+ nlmsg_free(ctx->nl_msg);
+ nl_cb_put(ctx->nl_cb);
+ free(ctx);
+}
+
+static int ovpn_nl_cb_error(struct sockaddr_nl (*nla)__always_unused,
+ struct nlmsgerr *err, void *arg)
+{
+ struct nlmsghdr *nlh = (struct nlmsghdr *)err - 1;
+ struct nlattr *tb_msg[NLMSGERR_ATTR_MAX + 1];
+ int len = nlh->nlmsg_len;
+ struct nlattr *attrs;
+ int *ret = arg;
+ int ack_len = sizeof(*nlh) + sizeof(int) + sizeof(*nlh);
+
+ *ret = err->error;
+
+ if (!(nlh->nlmsg_flags & NLM_F_ACK_TLVS))
+ return NL_STOP;
+
+ if (!(nlh->nlmsg_flags & NLM_F_CAPPED))
+ ack_len += err->msg.nlmsg_len - sizeof(*nlh);
+
+ if (len <= ack_len)
+ return NL_STOP;
+
+ attrs = (void *)((uint8_t *)nlh + ack_len);
+ len -= ack_len;
+
+ nla_parse(tb_msg, NLMSGERR_ATTR_MAX, attrs, len, NULL);
+ if (tb_msg[NLMSGERR_ATTR_MSG]) {
+ len = strnlen((char *)nla_data(tb_msg[NLMSGERR_ATTR_MSG]),
+ nla_len(tb_msg[NLMSGERR_ATTR_MSG]));
+ fprintf(stderr, "kernel error: %*s\n", len,
+ (char *)nla_data(tb_msg[NLMSGERR_ATTR_MSG]));
+ }
+
+ if (tb_msg[NLMSGERR_ATTR_MISS_NEST]) {
+ fprintf(stderr, "missing required nesting type %u\n",
+ nla_get_u32(tb_msg[NLMSGERR_ATTR_MISS_NEST]));
+ }
+
+ if (tb_msg[NLMSGERR_ATTR_MISS_TYPE]) {
+ fprintf(stderr, "missing required attribute type %u\n",
+ nla_get_u32(tb_msg[NLMSGERR_ATTR_MISS_TYPE]));
+ }
+
+ return NL_STOP;
+}
+
+static int ovpn_nl_cb_finish(struct nl_msg (*msg)__always_unused,
+ void *arg)
+{
+ int *status = arg;
+
+ *status = 0;
+ return NL_SKIP;
+}
+
+static int ovpn_nl_cb_ack(struct nl_msg (*msg)__always_unused,
+ void *arg)
+{
+ int *status = arg;
+
+ *status = 0;
+ return NL_STOP;
+}
+
+static int ovpn_nl_msg_send(struct nl_ctx *ctx, ovpn_nl_cb cb)
+{
+ int status = 1;
+
+ nl_cb_err(ctx->nl_cb, NL_CB_CUSTOM, ovpn_nl_cb_error, &status);
+ nl_cb_set(ctx->nl_cb, NL_CB_FINISH, NL_CB_CUSTOM, ovpn_nl_cb_finish,
+ &status);
+ nl_cb_set(ctx->nl_cb, NL_CB_ACK, NL_CB_CUSTOM, ovpn_nl_cb_ack, &status);
+
+ if (cb)
+ nl_cb_set(ctx->nl_cb, NL_CB_VALID, NL_CB_CUSTOM, cb, ctx);
+
+ nl_send_auto_complete(ctx->nl_sock, ctx->nl_msg);
+
+ while (status == 1)
+ ovpn_nl_recvmsgs(ctx);
+
+ if (status < 0)
+ fprintf(stderr, "failed to send netlink message: %s (%d)\n",
+ strerror(-status), status);
+
+ return status;
+}
+
+static int ovpn_parse_key(const char *file, struct ovpn_ctx *ctx)
+{
+ int idx_enc, idx_dec, ret = -1;
+ unsigned char *ckey = NULL;
+ __u8 *bkey = NULL;
+ size_t olen = 0;
+ long ckey_len;
+ FILE *fp;
+
+ fp = fopen(file, "r");
+ if (!fp) {
+ fprintf(stderr, "cannot open: %s\n", file);
+ return -1;
+ }
+
+ /* get file size */
+ fseek(fp, 0L, SEEK_END);
+ ckey_len = ftell(fp);
+ rewind(fp);
+
+ /* if the file is longer, let's just read a portion */
+ if (ckey_len > 256)
+ ckey_len = 256;
+
+ ckey = malloc(ckey_len);
+ if (!ckey)
+ goto err;
+
+ ret = fread(ckey, 1, ckey_len, fp);
+ if (ret != ckey_len) {
+ fprintf(stderr,
+ "couldn't read enough data from key file: %dbytes read\n",
+ ret);
+ goto err;
+ }
+
+ olen = 0;
+ ret = mbedtls_base64_decode(NULL, 0, &olen, ckey, ckey_len);
+ if (ret != MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL) {
+ char buf[256];
+
+ mbedtls_strerror(ret, buf, sizeof(buf));
+ fprintf(stderr, "unexpected base64 error1: %s (%d)\n", buf,
+ ret);
+
+ goto err;
+ }
+
+ bkey = malloc(olen);
+ if (!bkey) {
+ fprintf(stderr, "cannot allocate binary key buffer\n");
+ goto err;
+ }
+
+ ret = mbedtls_base64_decode(bkey, olen, &olen, ckey, ckey_len);
+ if (ret) {
+ char buf[256];
+
+ mbedtls_strerror(ret, buf, sizeof(buf));
+ fprintf(stderr, "unexpected base64 error2: %s (%d)\n", buf,
+ ret);
+
+ goto err;
+ }
+
+ if (olen < 2 * KEY_LEN + NONCE_LEN) {
+ fprintf(stderr,
+ "not enough data in key file, found %zdB but needs %dB\n",
+ olen, 2 * KEY_LEN + NONCE_LEN);
+ goto err;
+ }
+
+ switch (ctx->key_dir) {
+ case KEY_DIR_IN:
+ idx_enc = 0;
+ idx_dec = 1;
+ break;
+ case KEY_DIR_OUT:
+ idx_enc = 1;
+ idx_dec = 0;
+ break;
+ default:
+ goto err;
+ }
+
+ memcpy(ctx->key_enc, bkey + KEY_LEN * idx_enc, KEY_LEN);
+ memcpy(ctx->key_dec, bkey + KEY_LEN * idx_dec, KEY_LEN);
+ memcpy(ctx->nonce, bkey + 2 * KEY_LEN, NONCE_LEN);
+
+ ret = 0;
+
+err:
+ fclose(fp);
+ free(bkey);
+ free(ckey);
+
+ return ret;
+}
+
+static int ovpn_parse_cipher(const char *cipher, struct ovpn_ctx *ctx)
+{
+ if (strcmp(cipher, "aes") == 0)
+ ctx->cipher = OVPN_CIPHER_ALG_AES_GCM;
+ else if (strcmp(cipher, "chachapoly") == 0)
+ ctx->cipher = OVPN_CIPHER_ALG_CHACHA20_POLY1305;
+ else if (strcmp(cipher, "none") == 0)
+ ctx->cipher = OVPN_CIPHER_ALG_NONE;
+ else
+ return -ENOTSUP;
+
+ return 0;
+}
+
+static int ovpn_parse_key_direction(const char *dir, struct ovpn_ctx *ctx)
+{
+ int in_dir;
+
+ in_dir = strtoll(dir, NULL, 10);
+ switch (in_dir) {
+ case KEY_DIR_IN:
+ case KEY_DIR_OUT:
+ ctx->key_dir = in_dir;
+ break;
+ default:
+ fprintf(stderr,
+ "invalid key direction provided. Can be 0 or 1 only\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static int ovpn_socket(struct ovpn_ctx *ctx, sa_family_t family, int proto)
+{
+ struct sockaddr_storage local_sock = { 0 };
+ struct sockaddr_in6 *in6;
+ struct sockaddr_in *in;
+ int ret, s, sock_type;
+ size_t sock_len;
+
+ if (proto == IPPROTO_UDP)
+ sock_type = SOCK_DGRAM;
+ else if (proto == IPPROTO_TCP)
+ sock_type = SOCK_STREAM;
+ else
+ return -EINVAL;
+
+ s = socket(family, sock_type, 0);
+ if (s < 0) {
+ perror("cannot create socket");
+ return -1;
+ }
+
+ switch (family) {
+ case AF_INET:
+ in = (struct sockaddr_in *)&local_sock;
+ in->sin_family = family;
+ in->sin_port = htons(ctx->lport);
+ in->sin_addr.s_addr = htonl(INADDR_ANY);
+ sock_len = sizeof(*in);
+ break;
+ case AF_INET6:
+ in6 = (struct sockaddr_in6 *)&local_sock;
+ in6->sin6_family = family;
+ in6->sin6_port = htons(ctx->lport);
+ in6->sin6_addr = in6addr_any;
+ sock_len = sizeof(*in6);
+ break;
+ default:
+ return -1;
+ }
+
+ int opt = 1;
+
+ ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
+
+ if (ret < 0) {
+ perror("setsockopt for SO_REUSEADDR");
+ return ret;
+ }
+
+ ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &opt, sizeof(opt));
+ if (ret < 0) {
+ perror("setsockopt for SO_REUSEPORT");
+ return ret;
+ }
+
+ if (family == AF_INET6) {
+ opt = 0;
+ if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &opt,
+ sizeof(opt))) {
+ perror("failed to set IPV6_V6ONLY");
+ return -1;
+ }
+ }
+
+ ret = bind(s, (struct sockaddr *)&local_sock, sock_len);
+ if (ret < 0) {
+ perror("cannot bind socket");
+ goto err_socket;
+ }
+
+ ctx->socket = s;
+ ctx->sa_family = family;
+ return 0;
+
+err_socket:
+ close(s);
+ return -1;
+}
+
+static int ovpn_udp_socket(struct ovpn_ctx *ctx, sa_family_t family)
+{
+ return ovpn_socket(ctx, family, IPPROTO_UDP);
+}
+
+static int ovpn_listen(struct ovpn_ctx *ctx, sa_family_t family)
+{
+ int ret;
+
+ ret = ovpn_socket(ctx, family, IPPROTO_TCP);
+ if (ret < 0)
+ return ret;
+
+ ret = listen(ctx->socket, 10);
+ if (ret < 0) {
+ perror("listen");
+ close(ctx->socket);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int ovpn_accept(struct ovpn_ctx *ctx)
+{
+ socklen_t socklen;
+ int ret;
+
+ socklen = sizeof(ctx->remote);
+ ret = accept(ctx->socket, (struct sockaddr *)&ctx->remote, &socklen);
+ if (ret < 0) {
+ perror("accept");
+ goto err;
+ }
+
+ fprintf(stderr, "Connection received!\n");
+
+ switch (socklen) {
+ case sizeof(struct sockaddr_in):
+ case sizeof(struct sockaddr_in6):
+ break;
+ default:
+ fprintf(stderr, "error: expecting IPv4 or IPv6 connection\n");
+ close(ret);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ return ret;
+err:
+ close(ctx->socket);
+ return ret;
+}
+
+static int ovpn_connect(struct ovpn_ctx *ovpn)
+{
+ socklen_t socklen;
+ int s, ret;
+
+ s = socket(ovpn->remote.in4.sin_family, SOCK_STREAM, 0);
+ if (s < 0) {
+ perror("cannot create socket");
+ return -1;
+ }
+
+ switch (ovpn->remote.in4.sin_family) {
+ case AF_INET:
+ socklen = sizeof(struct sockaddr_in);
+ break;
+ case AF_INET6:
+ socklen = sizeof(struct sockaddr_in6);
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ ret = connect(s, (struct sockaddr *)&ovpn->remote, socklen);
+ if (ret < 0) {
+ perror("connect");
+ goto err;
+ }
+
+ fprintf(stderr, "connected\n");
+
+ ovpn->socket = s;
+
+ return 0;
+err:
+ close(s);
+ return ret;
+}
+
+static int ovpn_new_peer(struct ovpn_ctx *ovpn, bool is_tcp)
+{
+ struct nlattr *attr;
+ struct nl_ctx *ctx;
+ int ret = -1;
+
+ ctx = nl_ctx_alloc(ovpn, OVPN_CMD_PEER_NEW);
+ if (!ctx)
+ return -ENOMEM;
+
+ attr = nla_nest_start(ctx->nl_msg, OVPN_A_PEER);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_PEER_ID, ovpn->peer_id);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_PEER_SOCKET, ovpn->socket);
+
+ if (!is_tcp) {
+ switch (ovpn->remote.in4.sin_family) {
+ case AF_INET:
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_PEER_REMOTE_IPV4,
+ ovpn->remote.in4.sin_addr.s_addr);
+ NLA_PUT_U16(ctx->nl_msg, OVPN_A_PEER_REMOTE_PORT,
+ ovpn->remote.in4.sin_port);
+ break;
+ case AF_INET6:
+ NLA_PUT(ctx->nl_msg, OVPN_A_PEER_REMOTE_IPV6,
+ sizeof(ovpn->remote.in6.sin6_addr),
+ &ovpn->remote.in6.sin6_addr);
+ NLA_PUT_U32(ctx->nl_msg,
+ OVPN_A_PEER_REMOTE_IPV6_SCOPE_ID,
+ ovpn->remote.in6.sin6_scope_id);
+ NLA_PUT_U16(ctx->nl_msg, OVPN_A_PEER_REMOTE_PORT,
+ ovpn->remote.in6.sin6_port);
+ break;
+ default:
+ fprintf(stderr,
+ "Invalid family for remote socket address\n");
+ goto nla_put_failure;
+ }
+ }
+
+ if (ovpn->peer_ip_set) {
+ switch (ovpn->peer_ip.in4.sin_family) {
+ case AF_INET:
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_PEER_VPN_IPV4,
+ ovpn->peer_ip.in4.sin_addr.s_addr);
+ break;
+ case AF_INET6:
+ NLA_PUT(ctx->nl_msg, OVPN_A_PEER_VPN_IPV6,
+ sizeof(struct in6_addr),
+ &ovpn->peer_ip.in6.sin6_addr);
+ break;
+ default:
+ fprintf(stderr, "Invalid family for peer address\n");
+ goto nla_put_failure;
+ }
+ }
+
+ nla_nest_end(ctx->nl_msg, attr);
+
+ ret = ovpn_nl_msg_send(ctx, NULL);
+nla_put_failure:
+ nl_ctx_free(ctx);
+ return ret;
+}
+
+static int ovpn_set_peer(struct ovpn_ctx *ovpn)
+{
+ struct nlattr *attr;
+ struct nl_ctx *ctx;
+ int ret = -1;
+
+ ctx = nl_ctx_alloc(ovpn, OVPN_CMD_PEER_SET);
+ if (!ctx)
+ return -ENOMEM;
+
+ attr = nla_nest_start(ctx->nl_msg, OVPN_A_PEER);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_PEER_ID, ovpn->peer_id);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_PEER_KEEPALIVE_INTERVAL,
+ ovpn->keepalive_interval);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_PEER_KEEPALIVE_TIMEOUT,
+ ovpn->keepalive_timeout);
+ nla_nest_end(ctx->nl_msg, attr);
+
+ ret = ovpn_nl_msg_send(ctx, NULL);
+nla_put_failure:
+ nl_ctx_free(ctx);
+ return ret;
+}
+
+static int ovpn_del_peer(struct ovpn_ctx *ovpn)
+{
+ struct nlattr *attr;
+ struct nl_ctx *ctx;
+ int ret = -1;
+
+ ctx = nl_ctx_alloc(ovpn, OVPN_CMD_PEER_DEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ attr = nla_nest_start(ctx->nl_msg, OVPN_A_PEER);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_PEER_ID, ovpn->peer_id);
+ nla_nest_end(ctx->nl_msg, attr);
+
+ ret = ovpn_nl_msg_send(ctx, NULL);
+nla_put_failure:
+ nl_ctx_free(ctx);
+ return ret;
+}
+
+static int ovpn_handle_peer(struct nl_msg *msg, void (*arg)__always_unused)
+{
+ struct nlattr *pattrs[OVPN_A_PEER_MAX + 1];
+ struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+ struct nlattr *attrs[OVPN_A_MAX + 1];
+ __u16 rport = 0, lport = 0;
+
+ nla_parse(attrs, OVPN_A_MAX, genlmsg_attrdata(gnlh, 0),
+ genlmsg_attrlen(gnlh, 0), NULL);
+
+ if (!attrs[OVPN_A_PEER]) {
+ fprintf(stderr, "no packet content in netlink message\n");
+ return NL_SKIP;
+ }
+
+ nla_parse(pattrs, OVPN_A_PEER_MAX, nla_data(attrs[OVPN_A_PEER]),
+ nla_len(attrs[OVPN_A_PEER]), NULL);
+
+ if (pattrs[OVPN_A_PEER_ID])
+ fprintf(stderr, "* Peer %u\n",
+ nla_get_u32(pattrs[OVPN_A_PEER_ID]));
+
+ if (pattrs[OVPN_A_PEER_VPN_IPV4]) {
+ char buf[INET_ADDRSTRLEN];
+
+ inet_ntop(AF_INET, nla_data(pattrs[OVPN_A_PEER_VPN_IPV4]),
+ buf, sizeof(buf));
+ fprintf(stderr, "\tVPN IPv4: %s\n", buf);
+ }
+
+ if (pattrs[OVPN_A_PEER_VPN_IPV6]) {
+ char buf[INET6_ADDRSTRLEN];
+
+ inet_ntop(AF_INET6, nla_data(pattrs[OVPN_A_PEER_VPN_IPV6]),
+ buf, sizeof(buf));
+ fprintf(stderr, "\tVPN IPv6: %s\n", buf);
+ }
+
+ if (pattrs[OVPN_A_PEER_LOCAL_PORT])
+ lport = ntohs(nla_get_u16(pattrs[OVPN_A_PEER_LOCAL_PORT]));
+
+ if (pattrs[OVPN_A_PEER_REMOTE_PORT])
+ rport = ntohs(nla_get_u16(pattrs[OVPN_A_PEER_REMOTE_PORT]));
+
+ if (pattrs[OVPN_A_PEER_REMOTE_IPV6]) {
+ void *ip = pattrs[OVPN_A_PEER_REMOTE_IPV6];
+ char buf[INET6_ADDRSTRLEN];
+ int scope_id = -1;
+
+ if (pattrs[OVPN_A_PEER_REMOTE_IPV6_SCOPE_ID]) {
+ void *p = pattrs[OVPN_A_PEER_REMOTE_IPV6_SCOPE_ID];
+
+ scope_id = nla_get_u32(p);
+ }
+
+ inet_ntop(AF_INET6, nla_data(ip), buf, sizeof(buf));
+ fprintf(stderr, "\tRemote: %s:%hu (scope-id: %u)\n", buf, rport,
+ scope_id);
+
+ if (pattrs[OVPN_A_PEER_LOCAL_IPV6]) {
+ void *ip = pattrs[OVPN_A_PEER_LOCAL_IPV6];
+
+ inet_ntop(AF_INET6, nla_data(ip), buf, sizeof(buf));
+ fprintf(stderr, "\tLocal: %s:%hu\n", buf, lport);
+ }
+ }
+
+ if (pattrs[OVPN_A_PEER_REMOTE_IPV4]) {
+ void *ip = pattrs[OVPN_A_PEER_REMOTE_IPV4];
+ char buf[INET_ADDRSTRLEN];
+
+ inet_ntop(AF_INET, nla_data(ip), buf, sizeof(buf));
+ fprintf(stderr, "\tRemote: %s:%hu\n", buf, rport);
+
+ if (pattrs[OVPN_A_PEER_LOCAL_IPV4]) {
+ void *p = pattrs[OVPN_A_PEER_LOCAL_IPV4];
+
+ inet_ntop(AF_INET, nla_data(p), buf, sizeof(buf));
+ fprintf(stderr, "\tLocal: %s:%hu\n", buf, lport);
+ }
+ }
+
+ if (pattrs[OVPN_A_PEER_KEEPALIVE_INTERVAL]) {
+ void *p = pattrs[OVPN_A_PEER_KEEPALIVE_INTERVAL];
+
+ fprintf(stderr, "\tKeepalive interval: %u sec\n",
+ nla_get_u32(p));
+ }
+
+ if (pattrs[OVPN_A_PEER_KEEPALIVE_TIMEOUT])
+ fprintf(stderr, "\tKeepalive timeout: %u sec\n",
+ nla_get_u32(pattrs[OVPN_A_PEER_KEEPALIVE_TIMEOUT]));
+
+ if (pattrs[OVPN_A_PEER_VPN_RX_BYTES])
+ fprintf(stderr, "\tVPN RX bytes: %" PRIu64 "\n",
+ nla_get_uint(pattrs[OVPN_A_PEER_VPN_RX_BYTES]));
+
+ if (pattrs[OVPN_A_PEER_VPN_TX_BYTES])
+ fprintf(stderr, "\tVPN TX bytes: %" PRIu64 "\n",
+ nla_get_uint(pattrs[OVPN_A_PEER_VPN_TX_BYTES]));
+
+ if (pattrs[OVPN_A_PEER_VPN_RX_PACKETS])
+ fprintf(stderr, "\tVPN RX packets: %" PRIu64 "\n",
+ nla_get_uint(pattrs[OVPN_A_PEER_VPN_RX_PACKETS]));
+
+ if (pattrs[OVPN_A_PEER_VPN_TX_PACKETS])
+ fprintf(stderr, "\tVPN TX packets: %" PRIu64 "\n",
+ nla_get_uint(pattrs[OVPN_A_PEER_VPN_TX_PACKETS]));
+
+ if (pattrs[OVPN_A_PEER_LINK_RX_BYTES])
+ fprintf(stderr, "\tLINK RX bytes: %" PRIu64 "\n",
+ nla_get_uint(pattrs[OVPN_A_PEER_LINK_RX_BYTES]));
+
+ if (pattrs[OVPN_A_PEER_LINK_TX_BYTES])
+ fprintf(stderr, "\tLINK TX bytes: %" PRIu64 "\n",
+ nla_get_uint(pattrs[OVPN_A_PEER_LINK_TX_BYTES]));
+
+ if (pattrs[OVPN_A_PEER_LINK_RX_PACKETS])
+ fprintf(stderr, "\tLINK RX packets: %" PRIu64 "\n",
+ nla_get_uint(pattrs[OVPN_A_PEER_LINK_RX_PACKETS]));
+
+ if (pattrs[OVPN_A_PEER_LINK_TX_PACKETS])
+ fprintf(stderr, "\tLINK TX packets: %" PRIu64 "\n",
+ nla_get_uint(pattrs[OVPN_A_PEER_LINK_TX_PACKETS]));
+
+ return NL_SKIP;
+}
+
+static int ovpn_get_peer(struct ovpn_ctx *ovpn)
+{
+ int flags = 0, ret = -1;
+ struct nlattr *attr;
+ struct nl_ctx *ctx;
+
+ if (ovpn->peer_id == PEER_ID_UNDEF)
+ flags = NLM_F_DUMP;
+
+ ctx = nl_ctx_alloc_flags(ovpn, OVPN_CMD_PEER_GET, flags);
+ if (!ctx)
+ return -ENOMEM;
+
+ if (ovpn->peer_id != PEER_ID_UNDEF) {
+ attr = nla_nest_start(ctx->nl_msg, OVPN_A_PEER);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_PEER_ID, ovpn->peer_id);
+ nla_nest_end(ctx->nl_msg, attr);
+ }
+
+ ret = ovpn_nl_msg_send(ctx, ovpn_handle_peer);
+nla_put_failure:
+ nl_ctx_free(ctx);
+ return ret;
+}
+
+static int ovpn_new_key(struct ovpn_ctx *ovpn)
+{
+ struct nlattr *keyconf, *key_dir;
+ struct nl_ctx *ctx;
+ int ret = -1;
+
+ ctx = nl_ctx_alloc(ovpn, OVPN_CMD_KEY_NEW);
+ if (!ctx)
+ return -ENOMEM;
+
+ keyconf = nla_nest_start(ctx->nl_msg, OVPN_A_KEYCONF);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_KEYCONF_PEER_ID, ovpn->peer_id);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_KEYCONF_SLOT, ovpn->key_slot);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_KEYCONF_KEY_ID, ovpn->key_id);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_KEYCONF_CIPHER_ALG, ovpn->cipher);
+
+ key_dir = nla_nest_start(ctx->nl_msg, OVPN_A_KEYCONF_ENCRYPT_DIR);
+ NLA_PUT(ctx->nl_msg, OVPN_A_KEYDIR_CIPHER_KEY, KEY_LEN, ovpn->key_enc);
+ NLA_PUT(ctx->nl_msg, OVPN_A_KEYDIR_NONCE_TAIL, NONCE_LEN, ovpn->nonce);
+ nla_nest_end(ctx->nl_msg, key_dir);
+
+ key_dir = nla_nest_start(ctx->nl_msg, OVPN_A_KEYCONF_DECRYPT_DIR);
+ NLA_PUT(ctx->nl_msg, OVPN_A_KEYDIR_CIPHER_KEY, KEY_LEN, ovpn->key_dec);
+ NLA_PUT(ctx->nl_msg, OVPN_A_KEYDIR_NONCE_TAIL, NONCE_LEN, ovpn->nonce);
+ nla_nest_end(ctx->nl_msg, key_dir);
+
+ nla_nest_end(ctx->nl_msg, keyconf);
+
+ ret = ovpn_nl_msg_send(ctx, NULL);
+nla_put_failure:
+ nl_ctx_free(ctx);
+ return ret;
+}
+
+static int ovpn_del_key(struct ovpn_ctx *ovpn)
+{
+ struct nlattr *keyconf;
+ struct nl_ctx *ctx;
+ int ret = -1;
+
+ ctx = nl_ctx_alloc(ovpn, OVPN_CMD_KEY_DEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ keyconf = nla_nest_start(ctx->nl_msg, OVPN_A_KEYCONF);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_KEYCONF_PEER_ID, ovpn->peer_id);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_KEYCONF_SLOT, ovpn->key_slot);
+ nla_nest_end(ctx->nl_msg, keyconf);
+
+ ret = ovpn_nl_msg_send(ctx, NULL);
+nla_put_failure:
+ nl_ctx_free(ctx);
+ return ret;
+}
+
+static int ovpn_handle_key(struct nl_msg *msg, void (*arg)__always_unused)
+{
+ struct nlattr *kattrs[OVPN_A_KEYCONF_MAX + 1];
+ struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+ struct nlattr *attrs[OVPN_A_MAX + 1];
+
+ nla_parse(attrs, OVPN_A_MAX, genlmsg_attrdata(gnlh, 0),
+ genlmsg_attrlen(gnlh, 0), NULL);
+
+ if (!attrs[OVPN_A_KEYCONF]) {
+ fprintf(stderr, "no packet content in netlink message\n");
+ return NL_SKIP;
+ }
+
+ nla_parse(kattrs, OVPN_A_KEYCONF_MAX, nla_data(attrs[OVPN_A_KEYCONF]),
+ nla_len(attrs[OVPN_A_KEYCONF]), NULL);
+
+ if (kattrs[OVPN_A_KEYCONF_PEER_ID])
+ fprintf(stderr, "* Peer %u\n",
+ nla_get_u32(kattrs[OVPN_A_KEYCONF_PEER_ID]));
+ if (kattrs[OVPN_A_KEYCONF_SLOT]) {
+ fprintf(stderr, "\t- Slot: ");
+ switch (nla_get_u32(kattrs[OVPN_A_KEYCONF_SLOT])) {
+ case OVPN_KEY_SLOT_PRIMARY:
+ fprintf(stderr, "primary\n");
+ break;
+ case OVPN_KEY_SLOT_SECONDARY:
+ fprintf(stderr, "secondary\n");
+ break;
+ default:
+ fprintf(stderr, "invalid (%u)\n",
+ nla_get_u32(kattrs[OVPN_A_KEYCONF_SLOT]));
+ break;
+ }
+ }
+ if (kattrs[OVPN_A_KEYCONF_KEY_ID])
+ fprintf(stderr, "\t- Key ID: %u\n",
+ nla_get_u32(kattrs[OVPN_A_KEYCONF_KEY_ID]));
+ if (kattrs[OVPN_A_KEYCONF_CIPHER_ALG]) {
+ fprintf(stderr, "\t- Cipher: ");
+ switch (nla_get_u32(kattrs[OVPN_A_KEYCONF_CIPHER_ALG])) {
+ case OVPN_CIPHER_ALG_NONE:
+ fprintf(stderr, "none\n");
+ break;
+ case OVPN_CIPHER_ALG_AES_GCM:
+ fprintf(stderr, "aes-gcm\n");
+ break;
+ case OVPN_CIPHER_ALG_CHACHA20_POLY1305:
+ fprintf(stderr, "chacha20poly1305\n");
+ break;
+ default:
+ fprintf(stderr, "invalid (%u)\n",
+ nla_get_u32(kattrs[OVPN_A_KEYCONF_CIPHER_ALG]));
+ break;
+ }
+ }
+
+ return NL_SKIP;
+}
+
+static int ovpn_get_key(struct ovpn_ctx *ovpn)
+{
+ struct nlattr *keyconf;
+ struct nl_ctx *ctx;
+ int ret = -1;
+
+ ctx = nl_ctx_alloc(ovpn, OVPN_CMD_KEY_GET);
+ if (!ctx)
+ return -ENOMEM;
+
+ keyconf = nla_nest_start(ctx->nl_msg, OVPN_A_KEYCONF);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_KEYCONF_PEER_ID, ovpn->peer_id);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_KEYCONF_SLOT, ovpn->key_slot);
+ nla_nest_end(ctx->nl_msg, keyconf);
+
+ ret = ovpn_nl_msg_send(ctx, ovpn_handle_key);
+nla_put_failure:
+ nl_ctx_free(ctx);
+ return ret;
+}
+
+static int ovpn_swap_keys(struct ovpn_ctx *ovpn)
+{
+ struct nl_ctx *ctx;
+ struct nlattr *kc;
+ int ret = -1;
+
+ ctx = nl_ctx_alloc(ovpn, OVPN_CMD_KEY_SWAP);
+ if (!ctx)
+ return -ENOMEM;
+
+ kc = nla_nest_start(ctx->nl_msg, OVPN_A_KEYCONF);
+ NLA_PUT_U32(ctx->nl_msg, OVPN_A_KEYCONF_PEER_ID, ovpn->peer_id);
+ nla_nest_end(ctx->nl_msg, kc);
+
+ ret = ovpn_nl_msg_send(ctx, NULL);
+nla_put_failure:
+ nl_ctx_free(ctx);
+ return ret;
+}
+
+/**
+ * Helper function used to easily add attributes to a rtnl message
+ */
+static int ovpn_addattr(struct nlmsghdr *n, int maxlen, int type,
+ const void *data, int alen)
+{
+ int len = RTA_LENGTH(alen);
+ struct rtattr *rta;
+
+ if ((int)(NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len)) > maxlen) {
+ fprintf(stderr, "%s: rtnl: message exceeded bound of %d\n",
+ __func__, maxlen);
+ return -EMSGSIZE;
+ }
+
+ rta = nlmsg_tail(n);
+ rta->rta_type = type;
+ rta->rta_len = len;
+
+ if (!data)
+ memset(RTA_DATA(rta), 0, alen);
+ else
+ memcpy(RTA_DATA(rta), data, alen);
+
+ n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
+
+ return 0;
+}
+
+static struct rtattr *ovpn_nest_start(struct nlmsghdr *msg, size_t max_size,
+ int attr)
+{
+ struct rtattr *nest = nlmsg_tail(msg);
+
+ if (ovpn_addattr(msg, max_size, attr, NULL, 0) < 0)
+ return NULL;
+
+ return nest;
+}
+
+static void ovpn_nest_end(struct nlmsghdr *msg, struct rtattr *nest)
+{
+ nest->rta_len = (uint8_t *)nlmsg_tail(msg) - (uint8_t *)nest;
+}
+
+#define RT_SNDBUF_SIZE (1024 * 2)
+#define RT_RCVBUF_SIZE (1024 * 4)
+
+/**
+ * Open RTNL socket
+ */
+static int ovpn_rt_socket(void)
+{
+ int sndbuf = RT_SNDBUF_SIZE, rcvbuf = RT_RCVBUF_SIZE, fd;
+
+ fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ if (fd < 0) {
+ fprintf(stderr, "%s: cannot open netlink socket\n", __func__);
+ return fd;
+ }
+
+ if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &sndbuf,
+ sizeof(sndbuf)) < 0) {
+ fprintf(stderr, "%s: SO_SNDBUF\n", __func__);
+ close(fd);
+ return -1;
+ }
+
+ if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf,
+ sizeof(rcvbuf)) < 0) {
+ fprintf(stderr, "%s: SO_RCVBUF\n", __func__);
+ close(fd);
+ return -1;
+ }
+
+ return fd;
+}
+
+/**
+ * Bind socket to Netlink subsystem
+ */
+static int ovpn_rt_bind(int fd, uint32_t groups)
+{
+ struct sockaddr_nl local = { 0 };
+ socklen_t addr_len;
+
+ local.nl_family = AF_NETLINK;
+ local.nl_groups = groups;
+
+ if (bind(fd, (struct sockaddr *)&local, sizeof(local)) < 0) {
+ fprintf(stderr, "%s: cannot bind netlink socket: %d\n",
+ __func__, errno);
+ return -errno;
+ }
+
+ addr_len = sizeof(local);
+ if (getsockname(fd, (struct sockaddr *)&local, &addr_len) < 0) {
+ fprintf(stderr, "%s: cannot getsockname: %d\n", __func__,
+ errno);
+ return -errno;
+ }
+
+ if (addr_len != sizeof(local)) {
+ fprintf(stderr, "%s: wrong address length %d\n", __func__,
+ addr_len);
+ return -EINVAL;
+ }
+
+ if (local.nl_family != AF_NETLINK) {
+ fprintf(stderr, "%s: wrong address family %d\n", __func__,
+ local.nl_family);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+typedef int (*ovpn_parse_reply_cb)(struct nlmsghdr *msg, void *arg);
+
+/**
+ * Send Netlink message and run callback on reply (if specified)
+ */
+static int ovpn_rt_send(struct nlmsghdr *payload, pid_t peer,
+ unsigned int groups, ovpn_parse_reply_cb cb,
+ void *arg_cb)
+{
+ int len, rem_len, fd, ret, rcv_len;
+ struct sockaddr_nl nladdr = { 0 };
+ struct nlmsgerr *err;
+ struct nlmsghdr *h;
+ char buf[1024 * 16];
+ struct iovec iov = {
+ .iov_base = payload,
+ .iov_len = payload->nlmsg_len,
+ };
+ struct msghdr nlmsg = {
+ .msg_name = &nladdr,
+ .msg_namelen = sizeof(nladdr),
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ };
+
+ nladdr.nl_family = AF_NETLINK;
+ nladdr.nl_pid = peer;
+ nladdr.nl_groups = groups;
+
+ payload->nlmsg_seq = time(NULL);
+
+ /* no need to send reply */
+ if (!cb)
+ payload->nlmsg_flags |= NLM_F_ACK;
+
+ fd = ovpn_rt_socket();
+ if (fd < 0) {
+ fprintf(stderr, "%s: can't open rtnl socket\n", __func__);
+ return -errno;
+ }
+
+ ret = ovpn_rt_bind(fd, 0);
+ if (ret < 0) {
+ fprintf(stderr, "%s: can't bind rtnl socket\n", __func__);
+ ret = -errno;
+ goto out;
+ }
+
+ ret = sendmsg(fd, &nlmsg, 0);
+ if (ret < 0) {
+ fprintf(stderr, "%s: rtnl: error on sendmsg()\n", __func__);
+ ret = -errno;
+ goto out;
+ }
+
+ /* prepare buffer to store RTNL replies */
+ memset(buf, 0, sizeof(buf));
+ iov.iov_base = buf;
+
+ while (1) {
+ /*
+ * iov_len is modified by recvmsg(), therefore has to be initialized before
+ * using it again
+ */
+ iov.iov_len = sizeof(buf);
+ rcv_len = recvmsg(fd, &nlmsg, 0);
+ if (rcv_len < 0) {
+ if (errno == EINTR || errno == EAGAIN) {
+ fprintf(stderr, "%s: interrupted call\n",
+ __func__);
+ continue;
+ }
+ fprintf(stderr, "%s: rtnl: error on recvmsg()\n",
+ __func__);
+ ret = -errno;
+ goto out;
+ }
+
+ if (rcv_len == 0) {
+ fprintf(stderr,
+ "%s: rtnl: socket reached unexpected EOF\n",
+ __func__);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (nlmsg.msg_namelen != sizeof(nladdr)) {
+ fprintf(stderr,
+ "%s: sender address length: %u (expected %zu)\n",
+ __func__, nlmsg.msg_namelen, sizeof(nladdr));
+ ret = -EIO;
+ goto out;
+ }
+
+ h = (struct nlmsghdr *)buf;
+ while (rcv_len >= (int)sizeof(*h)) {
+ len = h->nlmsg_len;
+ rem_len = len - sizeof(*h);
+
+ if (rem_len < 0 || len > rcv_len) {
+ if (nlmsg.msg_flags & MSG_TRUNC) {
+ fprintf(stderr, "%s: truncated message\n",
+ __func__);
+ ret = -EIO;
+ goto out;
+ }
+ fprintf(stderr, "%s: malformed message: len=%d\n",
+ __func__, len);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (h->nlmsg_type == NLMSG_DONE) {
+ ret = 0;
+ goto out;
+ }
+
+ if (h->nlmsg_type == NLMSG_ERROR) {
+ err = (struct nlmsgerr *)NLMSG_DATA(h);
+ if (rem_len < (int)sizeof(struct nlmsgerr)) {
+ fprintf(stderr, "%s: ERROR truncated\n",
+ __func__);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (err->error) {
+ fprintf(stderr, "%s: (%d) %s\n",
+ __func__, err->error,
+ strerror(-err->error));
+ ret = err->error;
+ goto out;
+ }
+
+ ret = 0;
+ if (cb) {
+ int r = cb(h, arg_cb);
+
+ if (r <= 0)
+ ret = r;
+ }
+ goto out;
+ }
+
+ if (cb) {
+ int r = cb(h, arg_cb);
+
+ if (r <= 0) {
+ ret = r;
+ goto out;
+ }
+ } else {
+ fprintf(stderr, "%s: RTNL: unexpected reply\n",
+ __func__);
+ }
+
+ rcv_len -= NLMSG_ALIGN(len);
+ h = (struct nlmsghdr *)((uint8_t *)h +
+ NLMSG_ALIGN(len));
+ }
+
+ if (nlmsg.msg_flags & MSG_TRUNC) {
+ fprintf(stderr, "%s: message truncated\n", __func__);
+ continue;
+ }
+
+ if (rcv_len) {
+ fprintf(stderr, "%s: rtnl: %d not parsed bytes\n",
+ __func__, rcv_len);
+ ret = -1;
+ goto out;
+ }
+ }
+out:
+ close(fd);
+
+ return ret;
+}
+
+struct ovpn_link_req {
+ struct nlmsghdr n;
+ struct ifinfomsg i;
+ char buf[256];
+};
+
+static int ovpn_new_iface(struct ovpn_ctx *ovpn)
+{
+ struct rtattr *linkinfo, *data;
+ struct ovpn_link_req req = { 0 };
+ int ret = -1;
+
+ fprintf(stdout, "Creating interface %s with mode %u\n", ovpn->ifname,
+ ovpn->mode);
+
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.i));
+ req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
+ req.n.nlmsg_type = RTM_NEWLINK;
+
+ if (ovpn_addattr(&req.n, sizeof(req), IFLA_IFNAME, ovpn->ifname,
+ strlen(ovpn->ifname) + 1) < 0)
+ goto err;
+
+ linkinfo = ovpn_nest_start(&req.n, sizeof(req), IFLA_LINKINFO);
+ if (!linkinfo)
+ goto err;
+
+ if (ovpn_addattr(&req.n, sizeof(req), IFLA_INFO_KIND, OVPN_FAMILY_NAME,
+ strlen(OVPN_FAMILY_NAME) + 1) < 0)
+ goto err;
+
+ if (ovpn->mode_set) {
+ data = ovpn_nest_start(&req.n, sizeof(req), IFLA_INFO_DATA);
+ if (!data)
+ goto err;
+
+ if (ovpn_addattr(&req.n, sizeof(req), IFLA_OVPN_MODE,
+ &ovpn->mode, sizeof(uint8_t)) < 0)
+ goto err;
+
+ ovpn_nest_end(&req.n, data);
+ }
+
+ ovpn_nest_end(&req.n, linkinfo);
+
+ req.i.ifi_family = AF_PACKET;
+
+ ret = ovpn_rt_send(&req.n, 0, 0, NULL, NULL);
+err:
+ return ret;
+}
+
+static int ovpn_del_iface(struct ovpn_ctx *ovpn)
+{
+ struct ovpn_link_req req = { 0 };
+
+ fprintf(stdout, "Deleting interface %s ifindex %u\n", ovpn->ifname,
+ ovpn->ifindex);
+
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.i));
+ req.n.nlmsg_flags = NLM_F_REQUEST;
+ req.n.nlmsg_type = RTM_DELLINK;
+
+ req.i.ifi_family = AF_PACKET;
+ req.i.ifi_index = ovpn->ifindex;
+
+ return ovpn_rt_send(&req.n, 0, 0, NULL, NULL);
+}
+
+static int nl_seq_check(struct nl_msg (*msg)__always_unused,
+ void (*arg)__always_unused)
+{
+ return NL_OK;
+}
+
+struct mcast_handler_args {
+ const char *group;
+ int id;
+};
+
+static int mcast_family_handler(struct nl_msg *msg, void *arg)
+{
+ struct mcast_handler_args *grp = arg;
+ struct nlattr *tb[CTRL_ATTR_MAX + 1];
+ struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+ struct nlattr *mcgrp;
+ int rem_mcgrp;
+
+ nla_parse(tb, CTRL_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
+ genlmsg_attrlen(gnlh, 0), NULL);
+
+ if (!tb[CTRL_ATTR_MCAST_GROUPS])
+ return NL_SKIP;
+
+ nla_for_each_nested(mcgrp, tb[CTRL_ATTR_MCAST_GROUPS], rem_mcgrp) {
+ struct nlattr *tb_mcgrp[CTRL_ATTR_MCAST_GRP_MAX + 1];
+
+ nla_parse(tb_mcgrp, CTRL_ATTR_MCAST_GRP_MAX,
+ nla_data(mcgrp), nla_len(mcgrp), NULL);
+
+ if (!tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME] ||
+ !tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID])
+ continue;
+ if (strncmp(nla_data(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]),
+ grp->group, nla_len(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME])))
+ continue;
+ grp->id = nla_get_u32(tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]);
+ break;
+ }
+
+ return NL_SKIP;
+}
+
+static int mcast_error_handler(struct sockaddr_nl (*nla)__always_unused,
+ struct nlmsgerr *err, void *arg)
+{
+ int *ret = arg;
+
+ *ret = err->error;
+ return NL_STOP;
+}
+
+static int mcast_ack_handler(struct nl_msg (*msg)__always_unused, void *arg)
+{
+ int *ret = arg;
+
+ *ret = 0;
+ return NL_STOP;
+}
+
+static int ovpn_handle_msg(struct nl_msg *msg, void *arg)
+{
+ struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+ struct nlattr *attrs[OVPN_A_MAX + 1];
+ struct nlmsghdr *nlh = nlmsg_hdr(msg);
+ //enum ovpn_del_peer_reason reason;
+ char ifname[IF_NAMESIZE];
+ int *ret = arg;
+ __u32 ifindex;
+
+ fprintf(stderr, "received message from ovpn-dco\n");
+
+ *ret = -1;
+
+ if (!genlmsg_valid_hdr(nlh, 0)) {
+ fprintf(stderr, "invalid header\n");
+ return NL_STOP;
+ }
+
+ if (nla_parse(attrs, OVPN_A_MAX, genlmsg_attrdata(gnlh, 0),
+ genlmsg_attrlen(gnlh, 0), NULL)) {
+ fprintf(stderr, "received bogus data from ovpn-dco\n");
+ return NL_STOP;
+ }
+
+ if (!attrs[OVPN_A_IFINDEX]) {
+ fprintf(stderr, "no ifindex in this message\n");
+ return NL_STOP;
+ }
+
+ ifindex = nla_get_u32(attrs[OVPN_A_IFINDEX]);
+ if (!if_indextoname(ifindex, ifname)) {
+ fprintf(stderr, "cannot resolve ifname for ifindex: %u\n",
+ ifindex);
+ return NL_STOP;
+ }
+
+ switch (gnlh->cmd) {
+ case OVPN_CMD_PEER_DEL_NTF:
+ /*if (!attrs[OVPN_A_DEL_PEER_REASON]) {
+ * fprintf(stderr, "no reason in DEL_PEER message\n");
+ * return NL_STOP;
+ *}
+ *
+ *reason = nla_get_u8(attrs[OVPN_A_DEL_PEER_REASON]);
+ *fprintf(stderr,
+ * "received CMD_DEL_PEER, ifname: %s reason: %d\n",
+ * ifname, reason);
+ */
+ fprintf(stdout, "received CMD_PEER_DEL_NTF\n");
+ break;
+ case OVPN_CMD_KEY_SWAP_NTF:
+ fprintf(stdout, "received CMD_KEY_SWAP_NTF\n");
+ break;
+ default:
+ fprintf(stderr, "received unknown command: %d\n", gnlh->cmd);
+ return NL_STOP;
+ }
+
+ *ret = 0;
+ return NL_OK;
+}
+
+static int ovpn_get_mcast_id(struct nl_sock *sock, const char *family,
+ const char *group)
+{
+ struct nl_msg *msg;
+ struct nl_cb *cb;
+ int ret, ctrlid;
+ struct mcast_handler_args grp = {
+ .group = group,
+ .id = -ENOENT,
+ };
+
+ msg = nlmsg_alloc();
+ if (!msg)
+ return -ENOMEM;
+
+ cb = nl_cb_alloc(NL_CB_DEFAULT);
+ if (!cb) {
+ ret = -ENOMEM;
+ goto out_fail_cb;
+ }
+
+ ctrlid = genl_ctrl_resolve(sock, "nlctrl");
+
+ genlmsg_put(msg, 0, 0, ctrlid, 0, 0, CTRL_CMD_GETFAMILY, 0);
+
+ ret = -ENOBUFS;
+ NLA_PUT_STRING(msg, CTRL_ATTR_FAMILY_NAME, family);
+
+ ret = nl_send_auto_complete(sock, msg);
+ if (ret < 0)
+ goto nla_put_failure;
+
+ ret = 1;
+
+ nl_cb_err(cb, NL_CB_CUSTOM, mcast_error_handler, &ret);
+ nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, mcast_ack_handler, &ret);
+ nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, mcast_family_handler, &grp);
+
+ while (ret > 0)
+ nl_recvmsgs(sock, cb);
+
+ if (ret == 0)
+ ret = grp.id;
+ nla_put_failure:
+ nl_cb_put(cb);
+ out_fail_cb:
+ nlmsg_free(msg);
+ return ret;
+}
+
+static int ovpn_listen_mcast(void)
+{
+ struct nl_sock *sock;
+ struct nl_cb *cb;
+ int mcid, ret;
+
+ sock = nl_socket_alloc();
+ if (!sock) {
+ fprintf(stderr, "cannot allocate netlink socket\n");
+ goto err_free;
+ }
+
+ nl_socket_set_buffer_size(sock, 8192, 8192);
+
+ ret = genl_connect(sock);
+ if (ret < 0) {
+ fprintf(stderr, "cannot connect to generic netlink: %s\n",
+ nl_geterror(ret));
+ goto err_free;
+ }
+
+ mcid = ovpn_get_mcast_id(sock, OVPN_FAMILY_NAME, OVPN_MCGRP_PEERS);
+ if (mcid < 0) {
+ fprintf(stderr, "cannot get mcast group: %s\n",
+ nl_geterror(mcid));
+ goto err_free;
+ }
+
+ ret = nl_socket_add_membership(sock, mcid);
+ if (ret) {
+ fprintf(stderr, "failed to join mcast group: %d\n", ret);
+ goto err_free;
+ }
+
+ ret = 1;
+ cb = nl_cb_alloc(NL_CB_DEFAULT);
+ nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, nl_seq_check, NULL);
+ nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, ovpn_handle_msg, &ret);
+ nl_cb_err(cb, NL_CB_CUSTOM, ovpn_nl_cb_error, &ret);
+
+ while (ret == 1) {
+ int err = nl_recvmsgs(sock, cb);
+
+ if (err < 0) {
+ fprintf(stderr,
+ "cannot receive netlink message: (%d) %s\n",
+ err, nl_geterror(-err));
+ ret = -1;
+ break;
+ }
+ }
+
+ nl_cb_put(cb);
+err_free:
+ nl_socket_free(sock);
+ return ret;
+}
+
+static void usage(const char *cmd)
+{
+ fprintf(stderr,
+ "Usage %s <command> <iface> [arguments..]\n",
+ cmd);
+ fprintf(stderr, "where <command> can be one of the following\n\n");
+
+ fprintf(stderr, "* new_iface <iface> [mode]: create new ovpn interface\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr, "\tmode:\n");
+ fprintf(stderr, "\t\t- P2P for peer-to-peer mode (i.e. client)\n");
+ fprintf(stderr, "\t\t- MP for multi-peer mode (i.e. server)\n");
+
+ fprintf(stderr, "* del_iface <iface>: delete ovpn interface\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+
+ fprintf(stderr,
+ "* listen <iface> <lport> <peers_file> [ipv6]: listen for incoming peer TCP connections\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr, "\tlport: TCP port to listen to\n");
+ fprintf(stderr,
+ "\tpeers_file: file containing one peer per line: Line format:\n");
+ fprintf(stderr, "\t\t<peer_id> <vpnaddr>\n");
+ fprintf(stderr,
+ "\tipv6: whether the socket should listen to the IPv6 wildcard address\n");
+
+ fprintf(stderr,
+ "* connect <iface> <peer_id> <raddr> <rport> [key_file]: start connecting peer of TCP-based VPN session\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr, "\tpeer_id: peer ID of the connecting peer\n");
+ fprintf(stderr, "\traddr: peer IP address to connect to\n");
+ fprintf(stderr, "\trport: peer TCP port to connect to\n");
+ fprintf(stderr,
+ "\tkey_file: file containing the symmetric key for encryption\n");
+
+ fprintf(stderr,
+ "* new_peer <iface> <peer_id> <lport> <raddr> <rport> [vpnaddr]: add new peer\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr, "\tlport: local UDP port to bind to\n");
+ fprintf(stderr,
+ "\tpeer_id: peer ID to be used in data packets to/from this peer\n");
+ fprintf(stderr, "\traddr: peer IP address\n");
+ fprintf(stderr, "\trport: peer UDP port\n");
+ fprintf(stderr, "\tvpnaddr: peer VPN IP\n");
+
+ fprintf(stderr,
+ "* new_multi_peer <iface> <lport> <peers_file>: add multiple peers as listed in the file\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr, "\tlport: local UDP port to bind to\n");
+ fprintf(stderr,
+ "\tpeers_file: text file containing one peer per line. Line format:\n");
+ fprintf(stderr, "\t\t<peer_id> <raddr> <rport> <vpnaddr>\n");
+
+ fprintf(stderr,
+ "* set_peer <iface> <peer_id> <keepalive_interval> <keepalive_timeout>: set peer attributes\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr, "\tpeer_id: peer ID of the peer to modify\n");
+ fprintf(stderr,
+ "\tkeepalive_interval: interval for sending ping messages\n");
+ fprintf(stderr,
+ "\tkeepalive_timeout: time after which a peer is timed out\n");
+
+ fprintf(stderr, "* del_peer <iface> <peer_id>: delete peer\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr, "\tpeer_id: peer ID of the peer to delete\n");
+
+ fprintf(stderr, "* get_peer <iface> [peer_id]: retrieve peer(s) status\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr,
+ "\tpeer_id: peer ID of the peer to query. All peers are returned if omitted\n");
+
+ fprintf(stderr,
+ "* new_key <iface> <peer_id> <slot> <key_id> <cipher> <key_dir> <key_file>: set data channel key\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr,
+ "\tpeer_id: peer ID of the peer to configure the key for\n");
+ fprintf(stderr, "\tslot: either 1 (primary) or 2 (secondary)\n");
+ fprintf(stderr, "\tkey_id: an ID from 0 to 7\n");
+ fprintf(stderr,
+ "\tcipher: cipher to use, supported: aes (AES-GCM), chachapoly (CHACHA20POLY1305)\n");
+ fprintf(stderr,
+ "\tkey_dir: key direction, must 0 on one host and 1 on the other\n");
+ fprintf(stderr, "\tkey_file: file containing the pre-shared key\n");
+
+ fprintf(stderr,
+ "* del_key <iface> <peer_id> [slot]: erase existing data channel key\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr, "\tpeer_id: peer ID of the peer to modify\n");
+ fprintf(stderr, "\tslot: slot to erase. PRIMARY if omitted\n");
+
+ fprintf(stderr,
+ "* get_key <iface> <peer_id> <slot>: retrieve non sensible key data\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr, "\tpeer_id: peer ID of the peer to query\n");
+ fprintf(stderr, "\tslot: either 1 (primary) or 2 (secondary)\n");
+
+ fprintf(stderr,
+ "* swap_keys <iface> <peer_id>: swap content of primary and secondary key slots\n");
+ fprintf(stderr, "\tiface: ovpn interface name\n");
+ fprintf(stderr, "\tpeer_id: peer ID of the peer to modify\n");
+
+ fprintf(stderr,
+ "* listen_mcast: listen to ovpn netlink multicast messages\n");
+}
+
+static int ovpn_parse_remote(struct ovpn_ctx *ovpn, const char *host,
+ const char *service, const char *vpnip)
+{
+ int ret;
+ struct addrinfo *result;
+ struct addrinfo hints = {
+ .ai_family = ovpn->sa_family,
+ .ai_socktype = SOCK_DGRAM,
+ .ai_protocol = IPPROTO_UDP
+ };
+
+ if (host) {
+ ret = getaddrinfo(host, service, &hints, &result);
+ if (ret == EAI_NONAME || ret == EAI_FAIL)
+ return -1;
+
+ if (!(result->ai_family == AF_INET &&
+ result->ai_addrlen == sizeof(struct sockaddr_in)) &&
+ !(result->ai_family == AF_INET6 &&
+ result->ai_addrlen == sizeof(struct sockaddr_in6))) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ memcpy(&ovpn->remote, result->ai_addr, result->ai_addrlen);
+ }
+
+ if (vpnip) {
+ ret = getaddrinfo(vpnip, NULL, &hints, &result);
+ if (ret == EAI_NONAME || ret == EAI_FAIL)
+ return -1;
+
+ if (!(result->ai_family == AF_INET &&
+ result->ai_addrlen == sizeof(struct sockaddr_in)) &&
+ !(result->ai_family == AF_INET6 &&
+ result->ai_addrlen == sizeof(struct sockaddr_in6))) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ memcpy(&ovpn->peer_ip, result->ai_addr, result->ai_addrlen);
+ ovpn->sa_family = result->ai_family;
+
+ ovpn->peer_ip_set = true;
+ }
+
+ ret = 0;
+out:
+ freeaddrinfo(result);
+ return ret;
+}
+
+static int ovpn_parse_new_peer(struct ovpn_ctx *ovpn, const char *peer_id,
+ const char *raddr, const char *rport,
+ const char *vpnip)
+{
+ ovpn->peer_id = strtoul(peer_id, NULL, 10);
+ if (errno == ERANGE || ovpn->peer_id > PEER_ID_UNDEF) {
+ fprintf(stderr, "peer ID value out of range\n");
+ return -1;
+ }
+
+ return ovpn_parse_remote(ovpn, raddr, rport, vpnip);
+}
+
+static int ovpn_parse_key_slot(const char *arg, struct ovpn_ctx *ovpn)
+{
+ int slot = strtoul(arg, NULL, 10);
+
+ if (errno == ERANGE || slot < 1 || slot > 2) {
+ fprintf(stderr, "key slot out of range\n");
+ return -1;
+ }
+
+ switch (slot) {
+ case 1:
+ ovpn->key_slot = OVPN_KEY_SLOT_PRIMARY;
+ break;
+ case 2:
+ ovpn->key_slot = OVPN_KEY_SLOT_SECONDARY;
+ break;
+ }
+
+ return 0;
+}
+
+static int ovpn_send_tcp_data(int socket)
+{
+ uint16_t len = htons(1000);
+ uint8_t buf[1002];
+ int ret;
+
+ memcpy(buf, &len, sizeof(len));
+ memset(buf + sizeof(len), 0x86, sizeof(buf) - sizeof(len));
+
+ ret = send(socket, buf, sizeof(buf), 0);
+
+ fprintf(stdout, "Sent %u bytes over TCP socket\n", ret);
+
+ return ret > 0 ? 0 : ret;
+}
+
+static int ovpn_recv_tcp_data(int socket)
+{
+ uint8_t buf[1002];
+ uint16_t len;
+ int ret;
+
+ ret = recv(socket, buf, sizeof(buf), 0);
+
+ if (ret < 2) {
+ fprintf(stderr, ">>>> Error while reading TCP data: %d\n", ret);
+ return ret;
+ }
+
+ memcpy(&len, buf, sizeof(len));
+ len = ntohs(len);
+
+ fprintf(stdout, ">>>> Received %u bytes over TCP socket, header: %u\n",
+ ret, len);
+
+/* int i;
+ * for (i = 2; i < ret; i++) {
+ * fprintf(stdout, "0x%.2x ", buf[i]);
+ * if (i && !((i - 2) % 16))
+ * fprintf(stdout, "\n");
+ * }
+ * fprintf(stdout, "\n");
+ */
+ return 0;
+}
+
+static enum ovpn_cmd ovpn_parse_cmd(const char *cmd)
+{
+ if (!strcmp(cmd, "new_iface"))
+ return CMD_NEW_IFACE;
+
+ if (!strcmp(cmd, "del_iface"))
+ return CMD_DEL_IFACE;
+
+ if (!strcmp(cmd, "listen"))
+ return CMD_LISTEN;
+
+ if (!strcmp(cmd, "connect"))
+ return CMD_CONNECT;
+
+ if (!strcmp(cmd, "new_peer"))
+ return CMD_NEW_PEER;
+
+ if (!strcmp(cmd, "new_multi_peer"))
+ return CMD_NEW_MULTI_PEER;
+
+ if (!strcmp(cmd, "set_peer"))
+ return CMD_SET_PEER;
+
+ if (!strcmp(cmd, "del_peer"))
+ return CMD_DEL_PEER;
+
+ if (!strcmp(cmd, "get_peer"))
+ return CMD_GET_PEER;
+
+ if (!strcmp(cmd, "new_key"))
+ return CMD_NEW_KEY;
+
+ if (!strcmp(cmd, "del_key"))
+ return CMD_DEL_KEY;
+
+ if (!strcmp(cmd, "get_key"))
+ return CMD_GET_KEY;
+
+ if (!strcmp(cmd, "swap_keys"))
+ return CMD_SWAP_KEYS;
+
+ if (!strcmp(cmd, "listen_mcast"))
+ return CMD_LISTEN_MCAST;
+
+ return CMD_INVALID;
+}
+
+static int ovpn_run_cmd(struct ovpn_ctx *ovpn)
+{
+ char peer_id[10], vpnip[INET6_ADDRSTRLEN], raddr[128], rport[10];
+ int n, ret;
+ FILE *fp;
+
+ switch (ovpn->cmd) {
+ case CMD_NEW_IFACE:
+ ret = ovpn_new_iface(ovpn);
+ break;
+ case CMD_DEL_IFACE:
+ ret = ovpn_del_iface(ovpn);
+ break;
+ case CMD_LISTEN:
+ ret = ovpn_listen(ovpn, ovpn->sa_family);
+ if (ret < 0) {
+ fprintf(stderr, "cannot listen on TCP socket\n");
+ return ret;
+ }
+
+ fp = fopen(ovpn->peers_file, "r");
+ if (!fp) {
+ fprintf(stderr, "cannot open file: %s\n",
+ ovpn->peers_file);
+ return -1;
+ }
+
+ while ((n = fscanf(fp, "%s %s\n", peer_id, vpnip)) == 2) {
+ struct ovpn_ctx peer_ctx = { 0 };
+
+ peer_ctx.ifindex = ovpn->ifindex;
+ peer_ctx.sa_family = ovpn->sa_family;
+
+ peer_ctx.socket = ovpn_accept(ovpn);
+ if (peer_ctx.socket < 0) {
+ fprintf(stderr, "cannot accept connection!\n");
+ return -1;
+ }
+
+ /* store the socket of the first peer to test TCP I/O */
+ if (ovpn->cli_socket < 0)
+ ovpn->cli_socket = peer_ctx.socket;
+
+ ret = ovpn_parse_new_peer(&peer_ctx, peer_id, NULL,
+ NULL, vpnip);
+ if (ret < 0) {
+ fprintf(stderr, "error while parsing line\n");
+ return -1;
+ }
+
+ ret = ovpn_new_peer(&peer_ctx, true);
+ if (ret < 0) {
+ fprintf(stderr,
+ "cannot add peer to VPN: %s %s\n",
+ peer_id, vpnip);
+ return ret;
+ }
+ }
+
+ if (ovpn->cli_socket >= 0)
+ ret = ovpn_recv_tcp_data(ovpn->cli_socket);
+
+ break;
+ case CMD_CONNECT:
+ ret = ovpn_connect(ovpn);
+ if (ret < 0) {
+ fprintf(stderr, "cannot connect TCP socket\n");
+ return ret;
+ }
+
+ ret = ovpn_new_peer(ovpn, true);
+ if (ret < 0) {
+ fprintf(stderr, "cannot add peer to VPN\n");
+ close(ovpn->socket);
+ return ret;
+ }
+
+ if (ovpn->cipher != OVPN_CIPHER_ALG_NONE) {
+ ret = ovpn_new_key(ovpn);
+ if (ret < 0) {
+ fprintf(stderr, "cannot set key\n");
+ return ret;
+ }
+ }
+
+ ret = ovpn_send_tcp_data(ovpn->socket);
+ break;
+ case CMD_NEW_PEER:
+ ret = ovpn_udp_socket(ovpn, AF_INET6); //ovpn->sa_family ?
+ if (ret < 0)
+ return ret;
+
+ ret = ovpn_new_peer(ovpn, false);
+ break;
+ case CMD_NEW_MULTI_PEER:
+ ret = ovpn_udp_socket(ovpn, AF_INET6);
+ if (ret < 0)
+ return ret;
+
+ fp = fopen(ovpn->peers_file, "r");
+ if (!fp) {
+ fprintf(stderr, "cannot open file: %s\n",
+ ovpn->peers_file);
+ return -1;
+ }
+
+ while ((n = fscanf(fp, "%s %s %s %s\n", peer_id, raddr, rport,
+ vpnip)) == 4) {
+ struct ovpn_ctx peer_ctx = { 0 };
+
+ peer_ctx.ifindex = ovpn->ifindex;
+ peer_ctx.socket = ovpn->socket;
+ peer_ctx.sa_family = AF_UNSPEC;
+
+ ret = ovpn_parse_new_peer(&peer_ctx, peer_id, raddr,
+ rport, vpnip);
+ if (ret < 0) {
+ fprintf(stderr, "error while parsing line\n");
+ return -1;
+ }
+
+ ret = ovpn_new_peer(&peer_ctx, false);
+ if (ret < 0) {
+ fprintf(stderr,
+ "cannot add peer to VPN: %s %s %s %s\n",
+ peer_id, raddr, rport, vpnip);
+ return ret;
+ }
+ }
+ break;
+ case CMD_SET_PEER:
+ ret = ovpn_set_peer(ovpn);
+ break;
+ case CMD_DEL_PEER:
+ ret = ovpn_del_peer(ovpn);
+ break;
+ case CMD_GET_PEER:
+ if (ovpn->peer_id == PEER_ID_UNDEF)
+ fprintf(stderr, "List of peers connected to: %s\n",
+ ovpn->ifname);
+
+ ret = ovpn_get_peer(ovpn);
+ break;
+ case CMD_NEW_KEY:
+ ret = ovpn_new_key(ovpn);
+ break;
+ case CMD_DEL_KEY:
+ ret = ovpn_del_key(ovpn);
+ break;
+ case CMD_GET_KEY:
+ ret = ovpn_get_key(ovpn);
+ break;
+ case CMD_SWAP_KEYS:
+ ret = ovpn_swap_keys(ovpn);
+ break;
+ case CMD_LISTEN_MCAST:
+ ret = ovpn_listen_mcast();
+ break;
+ case CMD_INVALID:
+ break;
+ }
+
+ return ret;
+}
+
+static int ovpn_parse_cmd_args(struct ovpn_ctx *ovpn, int argc, char *argv[])
+{
+ int ret;
+
+ /* no args required for LISTEN_MCAST */
+ if (ovpn->cmd == CMD_LISTEN_MCAST)
+ return 0;
+
+ /* all commands need an ifname */
+ if (argc < 3)
+ return -EINVAL;
+
+ strscpy(ovpn->ifname, argv[2], IFNAMSIZ - 1);
+ ovpn->ifname[IFNAMSIZ - 1] = '\0';
+
+ /* all commands, except NEW_IFNAME, needs an ifindex */
+ if (ovpn->cmd != CMD_NEW_IFACE) {
+ ovpn->ifindex = if_nametoindex(ovpn->ifname);
+ if (!ovpn->ifindex) {
+ fprintf(stderr, "cannot find interface: %s\n",
+ strerror(errno));
+ return -1;
+ }
+ }
+
+ switch (ovpn->cmd) {
+ case CMD_NEW_IFACE:
+ if (argc < 4)
+ break;
+
+ if (!strcmp(argv[3], "P2P")) {
+ ovpn->mode = OVPN_MODE_P2P;
+ } else if (!strcmp(argv[3], "MP")) {
+ ovpn->mode = OVPN_MODE_MP;
+ } else {
+ fprintf(stderr, "Cannot parse iface mode: %s\n",
+ argv[3]);
+ return -1;
+ }
+ ovpn->mode_set = true;
+ break;
+ case CMD_DEL_IFACE:
+ break;
+ case CMD_LISTEN:
+ if (argc < 5)
+ return -EINVAL;
+
+ ovpn->lport = strtoul(argv[3], NULL, 10);
+ if (errno == ERANGE || ovpn->lport > 65535) {
+ fprintf(stderr, "lport value out of range\n");
+ return -1;
+ }
+
+ ovpn->peers_file = argv[4];
+
+ if (argc > 5 && !strcmp(argv[5], "ipv6"))
+ ovpn->sa_family = AF_INET6;
+ break;
+ case CMD_CONNECT:
+ if (argc < 6)
+ return -EINVAL;
+
+ ovpn->sa_family = AF_INET;
+
+ ret = ovpn_parse_new_peer(ovpn, argv[3], argv[4], argv[5],
+ NULL);
+ if (ret < 0) {
+ fprintf(stderr, "Cannot parse remote peer data\n");
+ return -1;
+ }
+
+ if (argc > 6) {
+ ovpn->key_slot = OVPN_KEY_SLOT_PRIMARY;
+ ovpn->key_id = 0;
+ ovpn->cipher = OVPN_CIPHER_ALG_AES_GCM;
+ ovpn->key_dir = KEY_DIR_OUT;
+
+ ret = ovpn_parse_key(argv[6], ovpn);
+ if (ret)
+ return -1;
+ }
+ break;
+ case CMD_NEW_PEER:
+ if (argc < 7)
+ return -EINVAL;
+
+ ovpn->lport = strtoul(argv[4], NULL, 10);
+ if (errno == ERANGE || ovpn->lport > 65535) {
+ fprintf(stderr, "lport value out of range\n");
+ return -1;
+ }
+
+ const char *vpnip = (argc > 7) ? argv[7] : NULL;
+
+ ret = ovpn_parse_new_peer(ovpn, argv[3], argv[5], argv[6],
+ vpnip);
+ if (ret < 0)
+ return -1;
+ break;
+ case CMD_NEW_MULTI_PEER:
+ if (argc < 5)
+ return -EINVAL;
+
+ ovpn->lport = strtoul(argv[3], NULL, 10);
+ if (errno == ERANGE || ovpn->lport > 65535) {
+ fprintf(stderr, "lport value out of range\n");
+ return -1;
+ }
+
+ ovpn->peers_file = argv[4];
+ break;
+ case CMD_SET_PEER:
+ if (argc < 6)
+ return -EINVAL;
+
+ ovpn->peer_id = strtoul(argv[3], NULL, 10);
+ if (errno == ERANGE || ovpn->peer_id > PEER_ID_UNDEF) {
+ fprintf(stderr, "peer ID value out of range\n");
+ return -1;
+ }
+
+ ovpn->keepalive_interval = strtoul(argv[4], NULL, 10);
+ if (errno == ERANGE) {
+ fprintf(stderr,
+ "keepalive interval value out of range\n");
+ return -1;
+ }
+
+ ovpn->keepalive_timeout = strtoul(argv[5], NULL, 10);
+ if (errno == ERANGE) {
+ fprintf(stderr,
+ "keepalive interval value out of range\n");
+ return -1;
+ }
+ break;
+ case CMD_DEL_PEER:
+ if (argc < 4)
+ return -EINVAL;
+
+ ovpn->peer_id = strtoul(argv[3], NULL, 10);
+ if (errno == ERANGE || ovpn->peer_id > PEER_ID_UNDEF) {
+ fprintf(stderr, "peer ID value out of range\n");
+ return -1;
+ }
+ break;
+ case CMD_GET_PEER:
+ ovpn->peer_id = PEER_ID_UNDEF;
+ if (argc > 3) {
+ ovpn->peer_id = strtoul(argv[3], NULL, 10);
+ if (errno == ERANGE || ovpn->peer_id > PEER_ID_UNDEF) {
+ fprintf(stderr, "peer ID value out of range\n");
+ return -1;
+ }
+ }
+ break;
+ case CMD_NEW_KEY:
+ if (argc < 9)
+ return -EINVAL;
+
+ ovpn->peer_id = strtoul(argv[3], NULL, 10);
+ if (errno == ERANGE) {
+ fprintf(stderr, "peer ID value out of range\n");
+ return -1;
+ }
+
+ ret = ovpn_parse_key_slot(argv[4], ovpn);
+ if (ret)
+ return -1;
+
+ ovpn->key_id = strtoul(argv[5], NULL, 10);
+ if (errno == ERANGE || ovpn->key_id > 2) {
+ fprintf(stderr, "key ID out of range\n");
+ return -1;
+ }
+
+ ret = ovpn_parse_cipher(argv[6], ovpn);
+ if (ret < 0)
+ return -1;
+
+ ret = ovpn_parse_key_direction(argv[7], ovpn);
+ if (ret < 0)
+ return -1;
+
+ ret = ovpn_parse_key(argv[8], ovpn);
+ if (ret)
+ return -1;
+ break;
+ case CMD_DEL_KEY:
+ if (argc < 4)
+ return -EINVAL;
+
+ ovpn->peer_id = strtoul(argv[3], NULL, 10);
+ if (errno == ERANGE) {
+ fprintf(stderr, "peer ID value out of range\n");
+ return -1;
+ }
+
+ ret = ovpn_parse_key_slot(argv[4], ovpn);
+ if (ret)
+ return ret;
+ break;
+ case CMD_GET_KEY:
+ if (argc < 5)
+ return -EINVAL;
+
+ ovpn->peer_id = strtoul(argv[3], NULL, 10);
+ if (errno == ERANGE) {
+ fprintf(stderr, "peer ID value out of range\n");
+ return -1;
+ }
+
+ ret = ovpn_parse_key_slot(argv[4], ovpn);
+ if (ret)
+ return ret;
+ break;
+ case CMD_SWAP_KEYS:
+ if (argc < 4)
+ return -EINVAL;
+
+ ovpn->peer_id = strtoul(argv[3], NULL, 10);
+ if (errno == ERANGE) {
+ fprintf(stderr, "peer ID value out of range\n");
+ return -1;
+ }
+ break;
+ case CMD_LISTEN_MCAST:
+ break;
+ case CMD_INVALID:
+ break;
+ }
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ struct ovpn_ctx ovpn;
+ int ret;
+
+ if (argc < 2) {
+ usage(argv[0]);
+ return -1;
+ }
+
+ memset(&ovpn, 0, sizeof(ovpn));
+ ovpn.sa_family = AF_INET;
+ ovpn.cipher = OVPN_CIPHER_ALG_NONE;
+ ovpn.cli_socket = -1;
+
+ ovpn.cmd = ovpn_parse_cmd(argv[1]);
+ if (ovpn.cmd == CMD_INVALID) {
+ fprintf(stderr, "Error: unknown command.\n\n");
+ usage(argv[0]);
+ return -1;
+ }
+
+ ret = ovpn_parse_cmd_args(&ovpn, argc, argv);
+ if (ret < 0) {
+ fprintf(stderr, "Error: invalid arguments.\n\n");
+ if (ret == -EINVAL)
+ usage(argv[0]);
+ return ret;
+ }
+
+ ret = ovpn_run_cmd(&ovpn);
+ if (ret)
+ fprintf(stderr, "Cannot execute command: %s (%d)\n",
+ strerror(-ret), ret);
+
+ return ret;
+}
new file mode 100644
@@ -0,0 +1,5 @@
+1 5.5.5.2
+2 5.5.5.3
+3 5.5.5.4
+4 5.5.5.5
+5 5.5.5.6
new file mode 100755
@@ -0,0 +1,9 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2024 OpenVPN, Inc.
+#
+# Author: Antonio Quartulli <antonio@openvpn.net>
+
+ALG="chachapoly"
+
+source test.sh
new file mode 100755
@@ -0,0 +1,9 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2024 OpenVPN, Inc.
+#
+# Author: Antonio Quartulli <antonio@openvpn.net>
+
+FLOAT="1"
+
+source test.sh
new file mode 100755
@@ -0,0 +1,9 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2024 OpenVPN, Inc.
+#
+# Author: Antonio Quartulli <antonio@openvpn.net>
+
+PROTO="TCP"
+
+source test.sh
new file mode 100755
@@ -0,0 +1,183 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2020-2024 OpenVPN, Inc.
+#
+# Author: Antonio Quartulli <antonio@openvpn.net>
+
+#set -x
+set -e
+
+UDP_PEERS_FILE=${UDP_PEERS_FILE:-udp_peers.txt}
+TCP_PEERS_FILE=${TCP_PEERS_FILE:-tcp_peers.txt}
+OVPN_CLI=${OVPN_CLI:-./ovpn-cli}
+ALG=${ALG:-aes}
+PROTO=${PROTO:-UDP}
+FLOAT=${FLOAT:-0}
+
+create_ns() {
+ ip netns add peer${1}
+}
+
+setup_ns() {
+ MODE="P2P"
+
+ if [ ${1} -eq 0 ]; then
+ MODE="MP"
+ for p in $(seq 1 ${NUM_PEERS}); do
+ ip link add veth${p} netns peer0 type veth peer name veth${p} netns peer${p}
+
+ ip -n peer0 addr add 10.10.${p}.1/24 dev veth${p}
+ ip -n peer0 link set veth${p} up
+
+ ip -n peer${p} addr add 10.10.${p}.2/24 dev veth${p}
+ ip -n peer${p} link set veth${p} up
+ done
+ fi
+
+ ip netns exec peer${1} ${OVPN_CLI} new_iface tun${1} $MODE
+ ip -n peer${1} addr add ${2} dev tun${1}
+ ip -n peer${1} link set tun${1} up
+}
+
+add_peer() {
+ if [ "${PROTO}" == "UDP" ]; then
+ if [ ${1} -eq 0 ]; then
+ ip netns exec peer0 ${OVPN_CLI} new_multi_peer tun0 1 ${UDP_PEERS_FILE}
+
+ for p in $(seq 1 ${NUM_PEERS}); do
+ ip netns exec peer0 ${OVPN_CLI} new_key tun0 ${p} 1 0 ${ALG} 0 \
+ data64.key
+ done
+ else
+ ip netns exec peer${1} ${OVPN_CLI} new_peer tun${1} ${1} 1 10.10.${1}.1 1
+ ip netns exec peer${1} ${OVPN_CLI} new_key tun${1} ${1} 1 0 ${ALG} 1 \
+ data64.key
+ fi
+ else
+ if [ ${1} -eq 0 ]; then
+ (ip netns exec peer0 ${OVPN_CLI} listen tun0 1 ${TCP_PEERS_FILE} && {
+ for p in $(seq 1 ${NUM_PEERS}); do
+ ip netns exec peer0 ${OVPN_CLI} new_key tun0 ${p} 1 0 \
+ ${ALG} 0 data64.key
+ done
+ }) &
+ sleep 5
+ else
+ ip netns exec peer${1} ${OVPN_CLI} connect tun${1} ${1} 10.10.${1}.1 1 \
+ data64.key
+ fi
+ fi
+}
+
+cleanup() {
+ for p in $(seq 1 10); do
+ ip -n peer0 link del veth${p} 2>/dev/null || true
+ done
+ for p in $(seq 0 10); do
+ ip netns exec peer${p} ${OVPN_CLI} del_iface tun${p} 2>/dev/null || true
+ ip netns del peer${p} 2>/dev/null || true
+ done
+}
+
+if [ "${PROTO}" == "UDP" ]; then
+ NUM_PEERS=${NUM_PEERS:-$(wc -l ${UDP_PEERS_FILE} | awk '{print $1}')}
+else
+ NUM_PEERS=${NUM_PEERS:-$(wc -l ${TCP_PEERS_FILE} | awk '{print $1}')}
+fi
+
+cleanup
+
+modprobe -q ovpn || true
+
+for p in $(seq 0 ${NUM_PEERS}); do
+ create_ns ${p}
+done
+
+for p in $(seq 0 ${NUM_PEERS}); do
+ setup_ns ${p} 5.5.5.$((${p} + 1))/24
+done
+
+for p in $(seq 0 ${NUM_PEERS}); do
+ add_peer ${p}
+done
+
+for p in $(seq 1 ${NUM_PEERS}); do
+ ip netns exec peer0 ${OVPN_CLI} set_peer tun0 ${p} 60 120
+ ip netns exec peer${p} ${OVPN_CLI} set_peer tun${p} ${p} 60 120
+done
+
+for p in $(seq 1 ${NUM_PEERS}); do
+ ip netns exec peer0 ping -qfc 1000 -w 5 5.5.5.$((${p} + 1))
+done
+
+if [ "$FLOAT" == "1" ]; then
+ # make clients float..
+ for p in $(seq 1 ${NUM_PEERS}); do
+ ip -n peer${p} addr del 10.10.${p}.2/24 dev veth${p}
+ ip -n peer${p} addr add 10.10.${p}.3/24 dev veth${p}
+ done
+ for p in $(seq 1 ${NUM_PEERS}); do
+ ip netns exec peer${p} ping -qfc 1000 -w 5 5.5.5.1
+ done
+fi
+
+ip netns exec peer0 iperf3 -1 -s &
+sleep 1
+ip netns exec peer1 iperf3 -Z -t 3 -c 5.5.5.1
+
+echo "Adding secondary key and then swap:"
+for p in $(seq 1 ${NUM_PEERS}); do
+ ip netns exec peer0 ${OVPN_CLI} new_key tun0 ${p} 2 1 ${ALG} 0 data64.key
+ ip netns exec peer${p} ${OVPN_CLI} new_key tun${p} ${p} 2 1 ${ALG} 1 data64.key
+ ip netns exec peer${p} ${OVPN_CLI} swap_keys tun${p} ${p}
+done
+
+sleep 1
+echo "Querying all peers:"
+ip netns exec peer0 ${OVPN_CLI} get_peer tun0
+ip netns exec peer1 ${OVPN_CLI} get_peer tun1
+
+echo "Querying peer 1:"
+ip netns exec peer0 ${OVPN_CLI} get_peer tun0 1
+
+echo "Querying non-existent peer 10:"
+ip netns exec peer0 ${OVPN_CLI} get_peer tun0 10 || true
+
+echo "Deleting peer 1:"
+ip netns exec peer0 ${OVPN_CLI} del_peer tun0 1
+ip netns exec peer1 ${OVPN_CLI} del_peer tun1 1
+
+echo "Querying keys:"
+for p in $(seq 2 ${NUM_PEERS}); do
+ ip netns exec peer${p} ${OVPN_CLI} get_key tun${p} ${p} 1
+ ip netns exec peer${p} ${OVPN_CLI} get_key tun${p} ${p} 2
+done
+
+echo "Deleting keys:"
+for p in $(seq 2 ${NUM_PEERS}); do
+ ip netns exec peer${p} ${OVPN_CLI} del_key tun${p} ${p} 1
+ ip netns exec peer${p} ${OVPN_CLI} del_key tun${p} ${p} 2
+done
+
+echo "Setting timeout to 10s MP:"
+# bring ifaces down to prevent traffic being sent
+for p in $(seq 0 ${NUM_PEERS}); do
+ ip -n peer${p} link set tun${p} down
+done
+# set short timeout
+for p in $(seq 2 ${NUM_PEERS}); do
+ ip netns exec peer0 ${OVPN_CLI} set_peer tun0 ${p} 10 10 || true
+ ip netns exec peer${p} ${OVPN_CLI} set_peer tun${p} ${p} 0 0
+done
+# wait for peers to timeout
+sleep 15
+
+echo "Setting timeout to 10s P2P:"
+for p in $(seq 2 ${NUM_PEERS}); do
+ ip netns exec peer${p} ${OVPN_CLI} set_peer tun${p} ${p} 10 10
+done
+sleep 15
+
+cleanup
+
+modprobe -r ovpn || true
new file mode 100644
@@ -0,0 +1,5 @@
+1 10.10.1.2 1 5.5.5.2
+2 10.10.2.2 1 5.5.5.3
+3 10.10.3.2 1 5.5.5.4
+4 10.10.4.2 1 5.5.5.5
+5 10.10.5.2 1 5.5.5.6