blob: bec15558fd938531c972574ddb61ff7a4ce557c8 [file] [log] [blame]
// 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");
return -1;
}
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;
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);
}