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brintos / linux-shallow public Read only

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1// SPDX-License-Identifier: LGPL-2.1 OR BSD-2-Clause2/* Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved. */3 4#define _GNU_SOURCE5#include <test_progs.h>6#include <network_helpers.h>7#include <ctype.h>8 9#define CMD_OUT_BUF_SIZE 102310 11#define SYS_OUT(cmd, ...) ({ \12	char buf[1024]; \13	snprintf(buf, sizeof(buf), (cmd), ##__VA_ARGS__); \14	FILE *f = popen(buf, "r"); \15	if (!ASSERT_OK_PTR(f, buf)) \16		goto out; \17	f; \18})19 20/* out must be at least `size * 4 + 1` bytes long */21static void escape_str(char *out, const char *in, size_t size)22{23	static const char *hex = "0123456789ABCDEF";24	size_t i;25 26	for (i = 0; i < size; i++) {27		if (isprint(in[i]) && in[i] != '\\' && in[i] != '\'') {28			*out++ = in[i];29		} else {30			*out++ = '\\';31			*out++ = 'x';32			*out++ = hex[(in[i] >> 4) & 0xf];33			*out++ = hex[in[i] & 0xf];34		}35	}36	*out++ = '\0';37}38 39static bool expect_str(char *buf, size_t size, const char *str, const char *name)40{41	static char escbuf_expected[CMD_OUT_BUF_SIZE * 4];42	static char escbuf_actual[CMD_OUT_BUF_SIZE * 4];43	static int duration = 0;44	bool ok;45 46	ok = size == strlen(str) && !memcmp(buf, str, size);47 48	if (!ok) {49		escape_str(escbuf_expected, str, strlen(str));50		escape_str(escbuf_actual, buf, size);51	}52	CHECK(!ok, name, "unexpected %s: actual '%s' != expected '%s'\n",53	      name, escbuf_actual, escbuf_expected);54 55	return ok;56}57 58static void test_synproxy(bool xdp)59{60	int server_fd = -1, client_fd = -1, accept_fd = -1;61	char *prog_id = NULL, *prog_id_end;62	struct nstoken *ns = NULL;63	FILE *ctrl_file = NULL;64	char buf[CMD_OUT_BUF_SIZE];65	size_t size;66 67	SYS(out, "ip netns add synproxy");68 69	SYS(out, "ip link add tmp0 type veth peer name tmp1");70	SYS(out, "ip link set tmp1 netns synproxy");71	SYS(out, "ip link set tmp0 up");72	SYS(out, "ip addr replace 198.18.0.1/24 dev tmp0");73 74	/* When checksum offload is enabled, the XDP program sees wrong75	 * checksums and drops packets.76	 */77	SYS(out, "ethtool -K tmp0 tx off");78	if (xdp)79		/* Workaround required for veth. */80		SYS(out, "ip link set tmp0 xdp object xdp_dummy.bpf.o section xdp 2> /dev/null");81 82	ns = open_netns("synproxy");83	if (!ASSERT_OK_PTR(ns, "setns"))84		goto out;85 86	SYS(out, "ip link set lo up");87	SYS(out, "ip link set tmp1 up");88	SYS(out, "ip addr replace 198.18.0.2/24 dev tmp1");89	SYS(out, "sysctl -w net.ipv4.tcp_syncookies=2");90	SYS(out, "sysctl -w net.ipv4.tcp_timestamps=1");91	SYS(out, "sysctl -w net.netfilter.nf_conntrack_tcp_loose=0");92	SYS(out, "iptables-legacy -t raw -I PREROUTING \93	    -i tmp1 -p tcp -m tcp --syn --dport 8080 -j CT --notrack");94	SYS(out, "iptables-legacy -t filter -A INPUT \95	    -i tmp1 -p tcp -m tcp --dport 8080 -m state --state INVALID,UNTRACKED \96	    -j SYNPROXY --sack-perm --timestamp --wscale 7 --mss 1460");97	SYS(out, "iptables-legacy -t filter -A INPUT \98	    -i tmp1 -m state --state INVALID -j DROP");99 100	ctrl_file = SYS_OUT("./xdp_synproxy --iface tmp1 --ports 8080 \101			    --single --mss4 1460 --mss6 1440 \102			    --wscale 7 --ttl 64%s", xdp ? "" : " --tc");103	size = fread(buf, 1, sizeof(buf), ctrl_file);104	pclose(ctrl_file);105	if (!expect_str(buf, size, "Total SYNACKs generated: 0\n",106			"initial SYNACKs"))107		goto out;108 109	if (!xdp) {110		ctrl_file = SYS_OUT("tc filter show dev tmp1 ingress");111		size = fread(buf, 1, sizeof(buf), ctrl_file);112		pclose(ctrl_file);113		prog_id = memmem(buf, size, " id ", 4);114		if (!ASSERT_OK_PTR(prog_id, "find prog id"))115			goto out;116		prog_id += 4;117		if (!ASSERT_LT(prog_id, buf + size, "find prog id begin"))118			goto out;119		prog_id_end = prog_id;120		while (prog_id_end < buf + size && *prog_id_end >= '0' &&121		       *prog_id_end <= '9')122			prog_id_end++;123		if (!ASSERT_LT(prog_id_end, buf + size, "find prog id end"))124			goto out;125		*prog_id_end = '\0';126	}127 128	server_fd = start_server(AF_INET, SOCK_STREAM, "198.18.0.2", 8080, 0);129	if (!ASSERT_GE(server_fd, 0, "start_server"))130		goto out;131 132	close_netns(ns);133	ns = NULL;134 135	client_fd = connect_to_fd(server_fd, 10000);136	if (!ASSERT_GE(client_fd, 0, "connect_to_fd"))137		goto out;138 139	accept_fd = accept(server_fd, NULL, NULL);140	if (!ASSERT_GE(accept_fd, 0, "accept"))141		goto out;142 143	ns = open_netns("synproxy");144	if (!ASSERT_OK_PTR(ns, "setns"))145		goto out;146 147	if (xdp)148		ctrl_file = SYS_OUT("./xdp_synproxy --iface tmp1 --single");149	else150		ctrl_file = SYS_OUT("./xdp_synproxy --prog %s --single",151				    prog_id);152	size = fread(buf, 1, sizeof(buf), ctrl_file);153	pclose(ctrl_file);154	if (!expect_str(buf, size, "Total SYNACKs generated: 1\n",155			"SYNACKs after connection"))156		goto out;157 158out:159	if (accept_fd >= 0)160		close(accept_fd);161	if (client_fd >= 0)162		close(client_fd);163	if (server_fd >= 0)164		close(server_fd);165	if (ns)166		close_netns(ns);167 168	SYS_NOFAIL("ip link del tmp0");169	SYS_NOFAIL("ip netns del synproxy");170}171 172void test_xdp_synproxy(void)173{174	if (test__start_subtest("xdp"))175		test_synproxy(true);176	if (test__start_subtest("tc"))177		test_synproxy(false);178}179