selftests/net: add ip_defrag selftest
This test creates a raw IPv4 socket, fragments a largish UDP datagram and sends the fragments out of order. Then repeats in a loop with different message and fragment lengths. Then does the same with overlapping fragments (with overlapping fragments the expectation is that the recv times out). Tested: root@<host># time ./ip_defrag.sh ipv4 defrag PASS ipv4 defrag with overlaps PASS real 1m7.679s user 0m0.628s sys 0m2.242s A similar test for IPv6 is to follow. Signed-off-by: Peter Oskolkov <posk@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>hifive-unleashed-5.1
Peter Oskolkov
David S. Miller
parent
0ff89efb52
commit
02c7f38b7a
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@ -14,3 +14,4 @@ udpgso_bench_rx
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udpgso_bench_tx
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tcp_inq
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tls
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ip_defrag
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@ -5,13 +5,13 @@ CFLAGS = -Wall -Wl,--no-as-needed -O2 -g
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CFLAGS += -I../../../../usr/include/
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TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh netdevice.sh rtnetlink.sh
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TEST_PROGS += fib_tests.sh fib-onlink-tests.sh pmtu.sh udpgso.sh
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TEST_PROGS += fib_tests.sh fib-onlink-tests.sh pmtu.sh udpgso.sh ip_defrag.sh
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TEST_PROGS += udpgso_bench.sh fib_rule_tests.sh msg_zerocopy.sh psock_snd.sh
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TEST_PROGS_EXTENDED := in_netns.sh
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TEST_GEN_FILES = socket
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TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy
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TEST_GEN_FILES += tcp_mmap tcp_inq psock_snd
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TEST_GEN_FILES += udpgso udpgso_bench_tx udpgso_bench_rx
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TEST_GEN_FILES += udpgso udpgso_bench_tx udpgso_bench_rx ip_defrag
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TEST_GEN_PROGS = reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
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TEST_GEN_PROGS += reuseport_dualstack reuseaddr_conflict tls
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@ -0,0 +1,313 @@
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// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <arpa/inet.h>
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#include <errno.h>
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#include <error.h>
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#include <linux/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <netinet/udp.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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static bool cfg_do_ipv4;
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static bool cfg_do_ipv6;
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static bool cfg_verbose;
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static bool cfg_overlap;
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static unsigned short cfg_port = 9000;
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const struct in_addr addr4 = { .s_addr = __constant_htonl(INADDR_LOOPBACK + 2) };
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#define IP4_HLEN (sizeof(struct iphdr))
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#define IP6_HLEN (sizeof(struct ip6_hdr))
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#define UDP_HLEN (sizeof(struct udphdr))
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static int msg_len;
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static int max_frag_len;
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#define MSG_LEN_MAX 60000 /* Max UDP payload length. */
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#define IP4_MF (1u << 13) /* IPv4 MF flag. */
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static uint8_t udp_payload[MSG_LEN_MAX];
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static uint8_t ip_frame[IP_MAXPACKET];
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static uint16_t ip_id = 0xabcd;
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static int msg_counter;
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static int frag_counter;
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static unsigned int seed;
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/* Receive a UDP packet. Validate it matches udp_payload. */
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static void recv_validate_udp(int fd_udp)
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{
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ssize_t ret;
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static uint8_t recv_buff[MSG_LEN_MAX];
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ret = recv(fd_udp, recv_buff, msg_len, 0);
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msg_counter++;
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if (cfg_overlap) {
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if (ret != -1)
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error(1, 0, "recv: expected timeout; got %d; seed = %u",
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(int)ret, seed);
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if (errno != ETIMEDOUT && errno != EAGAIN)
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error(1, errno, "recv: expected timeout: %d; seed = %u",
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errno, seed);
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return; /* OK */
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}
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if (ret == -1)
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error(1, errno, "recv: msg_len = %d max_frag_len = %d",
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msg_len, max_frag_len);
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if (ret != msg_len)
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error(1, 0, "recv: wrong size: %d vs %d", (int)ret, msg_len);
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if (memcmp(udp_payload, recv_buff, msg_len))
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error(1, 0, "recv: wrong data");
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}
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static uint32_t raw_checksum(uint8_t *buf, int len, uint32_t sum)
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{
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int i;
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for (i = 0; i < (len & ~1U); i += 2) {
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sum += (u_int16_t)ntohs(*((u_int16_t *)(buf + i)));
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if (sum > 0xffff)
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sum -= 0xffff;
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}
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if (i < len) {
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sum += buf[i] << 8;
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if (sum > 0xffff)
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sum -= 0xffff;
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}
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return sum;
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}
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static uint16_t udp_checksum(struct ip *iphdr, struct udphdr *udphdr)
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{
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uint32_t sum = 0;
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sum = raw_checksum((uint8_t *)&iphdr->ip_src, 2 * sizeof(iphdr->ip_src),
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IPPROTO_UDP + (uint32_t)(UDP_HLEN + msg_len));
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sum = raw_checksum((uint8_t *)udp_payload, msg_len, sum);
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sum = raw_checksum((uint8_t *)udphdr, UDP_HLEN, sum);
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return htons(0xffff & ~sum);
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}
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static void send_fragment(int fd_raw, struct sockaddr *addr, socklen_t alen,
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struct ip *iphdr, int offset)
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{
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int frag_len;
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int res;
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if (msg_len - offset <= max_frag_len) {
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/* This is the last fragment. */
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frag_len = IP4_HLEN + msg_len - offset;
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iphdr->ip_off = htons((offset + UDP_HLEN) / 8);
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} else {
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frag_len = IP4_HLEN + max_frag_len;
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iphdr->ip_off = htons((offset + UDP_HLEN) / 8 | IP4_MF);
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}
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iphdr->ip_len = htons(frag_len);
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memcpy(ip_frame + IP4_HLEN, udp_payload + offset,
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frag_len - IP4_HLEN);
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res = sendto(fd_raw, ip_frame, frag_len, 0, addr, alen);
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if (res < 0)
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error(1, errno, "send_fragment");
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if (res != frag_len)
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error(1, 0, "send_fragment: %d vs %d", res, frag_len);
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frag_counter++;
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}
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static void send_udp_frags_v4(int fd_raw, struct sockaddr *addr, socklen_t alen)
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{
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struct ip *iphdr = (struct ip *)ip_frame;
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struct udphdr udphdr;
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int res;
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int offset;
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int frag_len;
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/* Send the UDP datagram using raw IP fragments: the 0th fragment
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* has the UDP header; other fragments are pieces of udp_payload
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* split in chunks of frag_len size.
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*
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* Odd fragments (1st, 3rd, 5th, etc.) are sent out first, then
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* even fragments (0th, 2nd, etc.) are sent out.
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*/
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memset(iphdr, 0, sizeof(*iphdr));
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iphdr->ip_hl = 5;
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iphdr->ip_v = 4;
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iphdr->ip_tos = 0;
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iphdr->ip_id = htons(ip_id++);
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iphdr->ip_ttl = 0x40;
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iphdr->ip_p = IPPROTO_UDP;
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iphdr->ip_src.s_addr = htonl(INADDR_LOOPBACK);
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iphdr->ip_dst = addr4;
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iphdr->ip_sum = 0;
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/* Odd fragments. */
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offset = 0;
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while (offset < msg_len) {
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send_fragment(fd_raw, addr, alen, iphdr, offset);
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offset += 2 * max_frag_len;
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}
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if (cfg_overlap) {
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/* Send an extra random fragment. */
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offset = rand() % (UDP_HLEN + msg_len - 1);
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/* sendto() returns EINVAL if offset + frag_len is too small. */
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frag_len = IP4_HLEN + UDP_HLEN + rand() % 256;
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iphdr->ip_off = htons(offset / 8 | IP4_MF);
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iphdr->ip_len = htons(frag_len);
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res = sendto(fd_raw, ip_frame, frag_len, 0, addr, alen);
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if (res < 0)
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error(1, errno, "sendto overlap");
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if (res != frag_len)
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error(1, 0, "sendto overlap: %d vs %d", (int)res, frag_len);
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frag_counter++;
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}
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/* Zeroth fragment (UDP header). */
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frag_len = IP4_HLEN + UDP_HLEN;
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iphdr->ip_len = htons(frag_len);
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iphdr->ip_off = htons(IP4_MF);
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udphdr.source = htons(cfg_port + 1);
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udphdr.dest = htons(cfg_port);
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udphdr.len = htons(UDP_HLEN + msg_len);
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udphdr.check = 0;
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udphdr.check = udp_checksum(iphdr, &udphdr);
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memcpy(ip_frame + IP4_HLEN, &udphdr, UDP_HLEN);
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res = sendto(fd_raw, ip_frame, frag_len, 0, addr, alen);
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if (res < 0)
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error(1, errno, "sendto UDP header");
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if (res != frag_len)
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error(1, 0, "sendto UDP header: %d vs %d", (int)res, frag_len);
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frag_counter++;
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/* Even fragments. */
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offset = max_frag_len;
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while (offset < msg_len) {
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send_fragment(fd_raw, addr, alen, iphdr, offset);
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offset += 2 * max_frag_len;
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}
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}
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static void run_test(struct sockaddr *addr, socklen_t alen)
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{
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int fd_tx_udp, fd_tx_raw, fd_rx_udp;
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struct timeval tv = { .tv_sec = 0, .tv_usec = 10 * 1000 };
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int idx;
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/* Initialize the payload. */
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for (idx = 0; idx < MSG_LEN_MAX; ++idx)
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udp_payload[idx] = idx % 256;
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/* Open sockets. */
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fd_tx_udp = socket(addr->sa_family, SOCK_DGRAM, 0);
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if (fd_tx_udp == -1)
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error(1, errno, "socket tx_udp");
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fd_tx_raw = socket(addr->sa_family, SOCK_RAW, IPPROTO_RAW);
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if (fd_tx_raw == -1)
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error(1, errno, "socket tx_raw");
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fd_rx_udp = socket(addr->sa_family, SOCK_DGRAM, 0);
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if (fd_rx_udp == -1)
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error(1, errno, "socket rx_udp");
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if (bind(fd_rx_udp, addr, alen))
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error(1, errno, "bind");
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/* Fail fast. */
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if (setsockopt(fd_rx_udp, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)))
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error(1, errno, "setsockopt rcv timeout");
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for (msg_len = 1; msg_len < MSG_LEN_MAX; msg_len += (rand() % 4096)) {
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if (cfg_verbose)
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printf("msg_len: %d\n", msg_len);
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max_frag_len = addr->sa_family == AF_INET ? 8 : 1280;
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for (; max_frag_len < 1500 && max_frag_len <= msg_len;
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max_frag_len += 8) {
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send_udp_frags_v4(fd_tx_raw, addr, alen);
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recv_validate_udp(fd_rx_udp);
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}
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}
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/* Cleanup. */
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if (close(fd_tx_raw))
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error(1, errno, "close tx_raw");
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if (close(fd_tx_udp))
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error(1, errno, "close tx_udp");
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if (close(fd_rx_udp))
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error(1, errno, "close rx_udp");
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if (cfg_verbose)
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printf("processed %d messages, %d fragments\n",
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msg_counter, frag_counter);
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fprintf(stderr, "PASS\n");
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}
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static void run_test_v4(void)
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{
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struct sockaddr_in addr = {0};
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addr.sin_family = AF_INET;
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addr.sin_port = htons(cfg_port);
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addr.sin_addr = addr4;
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run_test((void *)&addr, sizeof(addr));
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}
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static void run_test_v6(void)
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{
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fprintf(stderr, "NOT IMPL.\n");
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exit(1);
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}
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static void parse_opts(int argc, char **argv)
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{
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int c;
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while ((c = getopt(argc, argv, "46ov")) != -1) {
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switch (c) {
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case '4':
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cfg_do_ipv4 = true;
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break;
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case '6':
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cfg_do_ipv6 = true;
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break;
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case 'o':
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cfg_overlap = true;
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break;
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case 'v':
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cfg_verbose = true;
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break;
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default:
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error(1, 0, "%s: parse error", argv[0]);
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}
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}
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}
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int main(int argc, char **argv)
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{
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parse_opts(argc, argv);
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seed = time(NULL);
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srand(seed);
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if (cfg_do_ipv4)
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run_test_v4();
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if (cfg_do_ipv6)
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run_test_v6();
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return 0;
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}
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@ -0,0 +1,28 @@
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Run a couple of IP defragmentation tests.
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set +x
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set -e
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echo "ipv4 defrag"
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run_v4() {
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sysctl -w net.ipv4.ipfrag_high_thresh=9000000 &> /dev/null
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sysctl -w net.ipv4.ipfrag_low_thresh=7000000 &> /dev/null
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./ip_defrag -4
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}
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export -f run_v4
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./in_netns.sh "run_v4"
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echo "ipv4 defrag with overlaps"
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run_v4o() {
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sysctl -w net.ipv4.ipfrag_high_thresh=9000000 &> /dev/null
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sysctl -w net.ipv4.ipfrag_low_thresh=7000000 &> /dev/null
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./ip_defrag -4o
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}
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export -f run_v4o
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./in_netns.sh "run_v4o"
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Loading…
Reference in New Issue