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-rw-r--r--tools/testing/selftests/bpf/network_helpers.c470
1 files changed, 470 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
new file mode 100644
index 000000000..1fa467238
--- /dev/null
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -0,0 +1,470 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define _GNU_SOURCE
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sched.h>
+
+#include <arpa/inet.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+
+#include <linux/err.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/limits.h>
+
+#include "bpf_util.h"
+#include "network_helpers.h"
+#include "test_progs.h"
+
+#ifndef IPPROTO_MPTCP
+#define IPPROTO_MPTCP 262
+#endif
+
+#define clean_errno() (errno == 0 ? "None" : strerror(errno))
+#define log_err(MSG, ...) ({ \
+ int __save = errno; \
+ fprintf(stderr, "(%s:%d: errno: %s) " MSG "\n", \
+ __FILE__, __LINE__, clean_errno(), \
+ ##__VA_ARGS__); \
+ errno = __save; \
+})
+
+struct ipv4_packet pkt_v4 = {
+ .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
+ .iph.ihl = 5,
+ .iph.protocol = IPPROTO_TCP,
+ .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
+ .tcp.urg_ptr = 123,
+ .tcp.doff = 5,
+};
+
+struct ipv6_packet pkt_v6 = {
+ .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
+ .iph.nexthdr = IPPROTO_TCP,
+ .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
+ .tcp.urg_ptr = 123,
+ .tcp.doff = 5,
+};
+
+int settimeo(int fd, int timeout_ms)
+{
+ struct timeval timeout = { .tv_sec = 3 };
+
+ if (timeout_ms > 0) {
+ timeout.tv_sec = timeout_ms / 1000;
+ timeout.tv_usec = (timeout_ms % 1000) * 1000;
+ }
+
+ if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout,
+ sizeof(timeout))) {
+ log_err("Failed to set SO_RCVTIMEO");
+ return -1;
+ }
+
+ if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeout,
+ sizeof(timeout))) {
+ log_err("Failed to set SO_SNDTIMEO");
+ return -1;
+ }
+
+ return 0;
+}
+
+#define save_errno_close(fd) ({ int __save = errno; close(fd); errno = __save; })
+
+static int __start_server(int type, int protocol, const struct sockaddr *addr,
+ socklen_t addrlen, int timeout_ms, bool reuseport)
+{
+ int on = 1;
+ int fd;
+
+ fd = socket(addr->sa_family, type, protocol);
+ if (fd < 0) {
+ log_err("Failed to create server socket");
+ return -1;
+ }
+
+ if (settimeo(fd, timeout_ms))
+ goto error_close;
+
+ if (reuseport &&
+ setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on))) {
+ log_err("Failed to set SO_REUSEPORT");
+ goto error_close;
+ }
+
+ if (bind(fd, addr, addrlen) < 0) {
+ log_err("Failed to bind socket");
+ goto error_close;
+ }
+
+ if (type == SOCK_STREAM) {
+ if (listen(fd, 1) < 0) {
+ log_err("Failed to listed on socket");
+ goto error_close;
+ }
+ }
+
+ return fd;
+
+error_close:
+ save_errno_close(fd);
+ return -1;
+}
+
+static int start_server_proto(int family, int type, int protocol,
+ const char *addr_str, __u16 port, int timeout_ms)
+{
+ struct sockaddr_storage addr;
+ socklen_t addrlen;
+
+ if (make_sockaddr(family, addr_str, port, &addr, &addrlen))
+ return -1;
+
+ return __start_server(type, protocol, (struct sockaddr *)&addr,
+ addrlen, timeout_ms, false);
+}
+
+int start_server(int family, int type, const char *addr_str, __u16 port,
+ int timeout_ms)
+{
+ return start_server_proto(family, type, 0, addr_str, port, timeout_ms);
+}
+
+int start_mptcp_server(int family, const char *addr_str, __u16 port,
+ int timeout_ms)
+{
+ return start_server_proto(family, SOCK_STREAM, IPPROTO_MPTCP, addr_str,
+ port, timeout_ms);
+}
+
+int *start_reuseport_server(int family, int type, const char *addr_str,
+ __u16 port, int timeout_ms, unsigned int nr_listens)
+{
+ struct sockaddr_storage addr;
+ unsigned int nr_fds = 0;
+ socklen_t addrlen;
+ int *fds;
+
+ if (!nr_listens)
+ return NULL;
+
+ if (make_sockaddr(family, addr_str, port, &addr, &addrlen))
+ return NULL;
+
+ fds = malloc(sizeof(*fds) * nr_listens);
+ if (!fds)
+ return NULL;
+
+ fds[0] = __start_server(type, 0, (struct sockaddr *)&addr, addrlen,
+ timeout_ms, true);
+ if (fds[0] == -1)
+ goto close_fds;
+ nr_fds = 1;
+
+ if (getsockname(fds[0], (struct sockaddr *)&addr, &addrlen))
+ goto close_fds;
+
+ for (; nr_fds < nr_listens; nr_fds++) {
+ fds[nr_fds] = __start_server(type, 0, (struct sockaddr *)&addr,
+ addrlen, timeout_ms, true);
+ if (fds[nr_fds] == -1)
+ goto close_fds;
+ }
+
+ return fds;
+
+close_fds:
+ free_fds(fds, nr_fds);
+ return NULL;
+}
+
+void free_fds(int *fds, unsigned int nr_close_fds)
+{
+ if (fds) {
+ while (nr_close_fds)
+ close(fds[--nr_close_fds]);
+ free(fds);
+ }
+}
+
+int fastopen_connect(int server_fd, const char *data, unsigned int data_len,
+ int timeout_ms)
+{
+ struct sockaddr_storage addr;
+ socklen_t addrlen = sizeof(addr);
+ struct sockaddr_in *addr_in;
+ int fd, ret;
+
+ if (getsockname(server_fd, (struct sockaddr *)&addr, &addrlen)) {
+ log_err("Failed to get server addr");
+ return -1;
+ }
+
+ addr_in = (struct sockaddr_in *)&addr;
+ fd = socket(addr_in->sin_family, SOCK_STREAM, 0);
+ if (fd < 0) {
+ log_err("Failed to create client socket");
+ return -1;
+ }
+
+ if (settimeo(fd, timeout_ms))
+ goto error_close;
+
+ ret = sendto(fd, data, data_len, MSG_FASTOPEN, (struct sockaddr *)&addr,
+ addrlen);
+ if (ret != data_len) {
+ log_err("sendto(data, %u) != %d\n", data_len, ret);
+ goto error_close;
+ }
+
+ return fd;
+
+error_close:
+ save_errno_close(fd);
+ return -1;
+}
+
+static int connect_fd_to_addr(int fd,
+ const struct sockaddr_storage *addr,
+ socklen_t addrlen, const bool must_fail)
+{
+ int ret;
+
+ errno = 0;
+ ret = connect(fd, (const struct sockaddr *)addr, addrlen);
+ if (must_fail) {
+ if (!ret) {
+ log_err("Unexpected success to connect to server");
+ return -1;
+ }
+ if (errno != EPERM) {
+ log_err("Unexpected error from connect to server");
+ return -1;
+ }
+ } else {
+ if (ret) {
+ log_err("Failed to connect to server");
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static const struct network_helper_opts default_opts;
+
+int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts)
+{
+ struct sockaddr_storage addr;
+ struct sockaddr_in *addr_in;
+ socklen_t addrlen, optlen;
+ int fd, type, protocol;
+
+ if (!opts)
+ opts = &default_opts;
+
+ optlen = sizeof(type);
+ if (getsockopt(server_fd, SOL_SOCKET, SO_TYPE, &type, &optlen)) {
+ log_err("getsockopt(SOL_TYPE)");
+ return -1;
+ }
+
+ if (getsockopt(server_fd, SOL_SOCKET, SO_PROTOCOL, &protocol, &optlen)) {
+ log_err("getsockopt(SOL_PROTOCOL)");
+ return -1;
+ }
+
+ addrlen = sizeof(addr);
+ if (getsockname(server_fd, (struct sockaddr *)&addr, &addrlen)) {
+ log_err("Failed to get server addr");
+ return -1;
+ }
+
+ addr_in = (struct sockaddr_in *)&addr;
+ fd = socket(addr_in->sin_family, type, protocol);
+ if (fd < 0) {
+ log_err("Failed to create client socket");
+ return -1;
+ }
+
+ if (settimeo(fd, opts->timeout_ms))
+ goto error_close;
+
+ if (opts->cc && opts->cc[0] &&
+ setsockopt(fd, SOL_TCP, TCP_CONGESTION, opts->cc,
+ strlen(opts->cc) + 1))
+ goto error_close;
+
+ if (connect_fd_to_addr(fd, &addr, addrlen, opts->must_fail))
+ goto error_close;
+
+ return fd;
+
+error_close:
+ save_errno_close(fd);
+ return -1;
+}
+
+int connect_to_fd(int server_fd, int timeout_ms)
+{
+ struct network_helper_opts opts = {
+ .timeout_ms = timeout_ms,
+ };
+
+ return connect_to_fd_opts(server_fd, &opts);
+}
+
+int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms)
+{
+ struct sockaddr_storage addr;
+ socklen_t len = sizeof(addr);
+
+ if (settimeo(client_fd, timeout_ms))
+ return -1;
+
+ if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
+ log_err("Failed to get server addr");
+ return -1;
+ }
+
+ if (connect_fd_to_addr(client_fd, &addr, len, false))
+ return -1;
+
+ return 0;
+}
+
+int make_sockaddr(int family, const char *addr_str, __u16 port,
+ struct sockaddr_storage *addr, socklen_t *len)
+{
+ if (family == AF_INET) {
+ struct sockaddr_in *sin = (void *)addr;
+
+ memset(addr, 0, sizeof(*sin));
+ sin->sin_family = AF_INET;
+ sin->sin_port = htons(port);
+ if (addr_str &&
+ inet_pton(AF_INET, addr_str, &sin->sin_addr) != 1) {
+ log_err("inet_pton(AF_INET, %s)", addr_str);
+ return -1;
+ }
+ if (len)
+ *len = sizeof(*sin);
+ return 0;
+ } else if (family == AF_INET6) {
+ struct sockaddr_in6 *sin6 = (void *)addr;
+
+ memset(addr, 0, sizeof(*sin6));
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = htons(port);
+ if (addr_str &&
+ inet_pton(AF_INET6, addr_str, &sin6->sin6_addr) != 1) {
+ log_err("inet_pton(AF_INET6, %s)", addr_str);
+ return -1;
+ }
+ if (len)
+ *len = sizeof(*sin6);
+ return 0;
+ }
+ return -1;
+}
+
+char *ping_command(int family)
+{
+ if (family == AF_INET6) {
+ /* On some systems 'ping' doesn't support IPv6, so use ping6 if it is present. */
+ if (!system("which ping6 >/dev/null 2>&1"))
+ return "ping6";
+ else
+ return "ping -6";
+ }
+ return "ping";
+}
+
+struct nstoken {
+ int orig_netns_fd;
+};
+
+static int setns_by_fd(int nsfd)
+{
+ int err;
+
+ err = setns(nsfd, CLONE_NEWNET);
+ close(nsfd);
+
+ if (!ASSERT_OK(err, "setns"))
+ return err;
+
+ /* Switch /sys to the new namespace so that e.g. /sys/class/net
+ * reflects the devices in the new namespace.
+ */
+ err = unshare(CLONE_NEWNS);
+ if (!ASSERT_OK(err, "unshare"))
+ return err;
+
+ /* Make our /sys mount private, so the following umount won't
+ * trigger the global umount in case it's shared.
+ */
+ err = mount("none", "/sys", NULL, MS_PRIVATE, NULL);
+ if (!ASSERT_OK(err, "remount private /sys"))
+ return err;
+
+ err = umount2("/sys", MNT_DETACH);
+ if (!ASSERT_OK(err, "umount2 /sys"))
+ return err;
+
+ err = mount("sysfs", "/sys", "sysfs", 0, NULL);
+ if (!ASSERT_OK(err, "mount /sys"))
+ return err;
+
+ err = mount("bpffs", "/sys/fs/bpf", "bpf", 0, NULL);
+ if (!ASSERT_OK(err, "mount /sys/fs/bpf"))
+ return err;
+
+ err = mount("debugfs", "/sys/kernel/debug", "debugfs", 0, NULL);
+ if (!ASSERT_OK(err, "mount /sys/kernel/debug"))
+ return err;
+
+ return 0;
+}
+
+struct nstoken *open_netns(const char *name)
+{
+ int nsfd;
+ char nspath[PATH_MAX];
+ int err;
+ struct nstoken *token;
+
+ token = calloc(1, sizeof(struct nstoken));
+ if (!ASSERT_OK_PTR(token, "malloc token"))
+ return NULL;
+
+ token->orig_netns_fd = open("/proc/self/ns/net", O_RDONLY);
+ if (!ASSERT_GE(token->orig_netns_fd, 0, "open /proc/self/ns/net"))
+ goto fail;
+
+ snprintf(nspath, sizeof(nspath), "%s/%s", "/var/run/netns", name);
+ nsfd = open(nspath, O_RDONLY | O_CLOEXEC);
+ if (!ASSERT_GE(nsfd, 0, "open netns fd"))
+ goto fail;
+
+ err = setns_by_fd(nsfd);
+ if (!ASSERT_OK(err, "setns_by_fd"))
+ goto fail;
+
+ return token;
+fail:
+ free(token);
+ return NULL;
+}
+
+void close_netns(struct nstoken *token)
+{
+ ASSERT_OK(setns_by_fd(token->orig_netns_fd), "setns_by_fd");
+ free(token);
+}