selftests/net: add ipv6 tests to ip_defrag selftest
This patch adds ipv6 defragmentation tests to ip_defrag selftest, to complement existing ipv4 tests. Signed-off-by: Peter Oskolkov <posk@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter Oskolkov
David S. Miller
parent
8361962392
commit
bccc17118b
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@ -23,21 +23,28 @@ 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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const struct in6_addr addr6 = IN6ADDR_LOOPBACK_INIT;
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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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/* IPv6 fragment header lenth. */
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#define FRAG_HLEN 8
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static int payload_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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#define IP6_MF (1) /* IPv6 MF flag. */
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#define CSUM_MANGLED_0 (0xffff)
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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 uint32_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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@ -48,25 +55,25 @@ static void recv_validate_udp(int fd_udp)
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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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ret = recv(fd_udp, recv_buff, payload_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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error(1, 0, "recv: expected timeout; got %d",
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(int)ret);
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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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error(1, errno, "recv: expected timeout: %d",
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errno);
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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, errno, "recv: payload_len = %d max_frag_len = %d",
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payload_len, max_frag_len);
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if (ret != payload_len)
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error(1, 0, "recv: wrong size: %d vs %d", (int)ret, payload_len);
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if (memcmp(udp_payload, recv_buff, payload_len))
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error(1, 0, "recv: wrong data");
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}
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@ -92,31 +99,95 @@ static uint32_t raw_checksum(uint8_t *buf, int len, uint32_t sum)
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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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uint16_t res;
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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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IPPROTO_UDP + (uint32_t)(UDP_HLEN + payload_len));
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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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sum = raw_checksum((uint8_t *)udp_payload, payload_len, sum);
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res = 0xffff & ~sum;
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if (res)
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return htons(res);
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else
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return CSUM_MANGLED_0;
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}
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static uint16_t udp6_checksum(struct ip6_hdr *iphdr, struct udphdr *udphdr)
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{
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uint32_t sum = 0;
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uint16_t res;
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sum = raw_checksum((uint8_t *)&iphdr->ip6_src, 2 * sizeof(iphdr->ip6_src),
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IPPROTO_UDP);
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sum = raw_checksum((uint8_t *)&udphdr->len, sizeof(udphdr->len), sum);
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sum = raw_checksum((uint8_t *)udphdr, UDP_HLEN, sum);
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sum = raw_checksum((uint8_t *)udp_payload, payload_len, sum);
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res = 0xffff & ~sum;
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if (res)
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return htons(res);
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else
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return CSUM_MANGLED_0;
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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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int offset, bool ipv6)
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{
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int frag_len;
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int res;
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int payload_offset = offset > 0 ? offset - UDP_HLEN : 0;
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uint8_t *frag_start = ipv6 ? ip_frame + IP6_HLEN + FRAG_HLEN :
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ip_frame + IP4_HLEN;
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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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if (offset == 0) {
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struct udphdr udphdr;
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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 + payload_len);
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udphdr.check = 0;
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if (ipv6)
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udphdr.check = udp6_checksum((struct ip6_hdr *)ip_frame, &udphdr);
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else
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udphdr.check = udp_checksum((struct ip *)ip_frame, &udphdr);
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memcpy(frag_start, &udphdr, UDP_HLEN);
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}
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if (ipv6) {
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struct ip6_hdr *ip6hdr = (struct ip6_hdr *)ip_frame;
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struct ip6_frag *fraghdr = (struct ip6_frag *)(ip_frame + IP6_HLEN);
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if (payload_len - payload_offset <= max_frag_len && offset > 0) {
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/* This is the last fragment. */
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frag_len = FRAG_HLEN + payload_len - payload_offset;
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fraghdr->ip6f_offlg = htons(offset);
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} else {
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frag_len = FRAG_HLEN + max_frag_len;
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fraghdr->ip6f_offlg = htons(offset | IP6_MF);
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}
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ip6hdr->ip6_plen = htons(frag_len);
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if (offset == 0)
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memcpy(frag_start + UDP_HLEN, udp_payload,
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frag_len - FRAG_HLEN - UDP_HLEN);
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else
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memcpy(frag_start, udp_payload + payload_offset,
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frag_len - FRAG_HLEN);
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frag_len += IP6_HLEN;
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} else {
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struct ip *iphdr = (struct ip *)ip_frame;
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if (payload_len - payload_offset <= max_frag_len && offset > 0) {
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/* This is the last fragment. */
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frag_len = IP4_HLEN + payload_len - payload_offset;
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iphdr->ip_off = htons(offset / 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 / 8 | IP4_MF);
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}
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iphdr->ip_len = htons(frag_len);
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if (offset == 0)
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memcpy(frag_start + UDP_HLEN, udp_payload,
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frag_len - IP4_HLEN - UDP_HLEN);
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else
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memcpy(frag_start, udp_payload + payload_offset,
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frag_len - IP4_HLEN);
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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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@ -127,9 +198,11 @@ static void send_fragment(int fd_raw, struct sockaddr *addr, socklen_t alen,
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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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static void send_udp_frags(int fd_raw, struct sockaddr *addr,
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socklen_t alen, bool ipv6)
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{
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struct ip *iphdr = (struct ip *)ip_frame;
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struct ip6_hdr *ip6hdr = (struct ip6_hdr *)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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@ -142,31 +215,55 @@ static void send_udp_frags_v4(int fd_raw, struct sockaddr *addr, socklen_t alen)
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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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if (ipv6) {
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struct ip6_frag *fraghdr = (struct ip6_frag *)(ip_frame + IP6_HLEN);
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((struct sockaddr_in6 *)addr)->sin6_port = 0;
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memset(ip6hdr, 0, sizeof(*ip6hdr));
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ip6hdr->ip6_flow = htonl(6<<28); /* Version. */
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ip6hdr->ip6_nxt = IPPROTO_FRAGMENT;
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ip6hdr->ip6_hops = 255;
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ip6hdr->ip6_src = addr6;
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ip6hdr->ip6_dst = addr6;
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fraghdr->ip6f_nxt = IPPROTO_UDP;
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fraghdr->ip6f_reserved = 0;
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fraghdr->ip6f_ident = htonl(ip_id++);
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} else {
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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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}
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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 = max_frag_len;
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while (offset < (UDP_HLEN + payload_len)) {
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send_fragment(fd_raw, addr, alen, offset, ipv6);
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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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offset = rand() % (UDP_HLEN + payload_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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if (ipv6) {
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struct ip6_frag *fraghdr = (struct ip6_frag *)(ip_frame + IP6_HLEN);
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frag_len = max_frag_len + rand() % 256;
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/* In IPv6 if !!(frag_len % 8), the fragment is dropped. */
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frag_len &= ~0x7;
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fraghdr->ip6f_offlg = htons(offset / 8 | IP6_MF);
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ip6hdr->ip6_plen = htons(frag_len);
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frag_len += IP6_HLEN;
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} else {
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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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}
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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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@ -175,48 +272,26 @@ static void send_udp_frags_v4(int fd_raw, struct sockaddr *addr, socklen_t alen)
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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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/* Event fragments. */
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offset = 0;
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while (offset < (UDP_HLEN + payload_len)) {
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send_fragment(fd_raw, addr, alen, offset, ipv6);
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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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static void run_test(struct sockaddr *addr, socklen_t alen, bool ipv6)
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{
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int fd_tx_udp, fd_tx_raw, fd_rx_udp;
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int 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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int min_frag_len = ipv6 ? 1280 : 8;
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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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@ -230,22 +305,21 @@ static void run_test(struct sockaddr *addr, socklen_t alen)
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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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for (payload_len = min_frag_len; payload_len < MSG_LEN_MAX;
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payload_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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printf("payload_len: %d\n", payload_len);
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max_frag_len = min_frag_len;
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do {
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send_udp_frags(fd_tx_raw, addr, alen, ipv6);
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recv_validate_udp(fd_rx_udp);
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}
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max_frag_len += 8 * (rand() % 8);
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} while (max_frag_len < (1500 - FRAG_HLEN) && max_frag_len <= payload_len);
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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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@ -265,13 +339,18 @@ static void run_test_v4(void)
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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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run_test((void *)&addr, sizeof(addr), false /* !ipv6 */);
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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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struct sockaddr_in6 addr = {0};
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addr.sin6_family = AF_INET6;
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addr.sin6_port = htons(cfg_port);
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addr.sin6_addr = addr6;
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run_test((void *)&addr, sizeof(addr), true /* ipv6 */);
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}
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static void parse_opts(int argc, char **argv)
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@ -303,6 +382,8 @@ int main(int argc, char **argv)
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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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/* Print the seed to track/reproduce potential failures. */
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printf("seed = %d\n", seed);
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if (cfg_do_ipv4)
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run_test_v4();
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@ -6,23 +6,34 @@
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set +x
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set -e
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echo "ipv4 defrag"
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readonly NETNS="ns-$(mktemp -u XXXXXX)"
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run_v4() {
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sysctl -w net.ipv4.ipfrag_high_thresh=9000000 &> /dev/null
|
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sysctl -w net.ipv4.ipfrag_low_thresh=7000000 &> /dev/null
|
||||
./ip_defrag -4
|
||||
setup() {
|
||||
ip netns add "${NETNS}"
|
||||
ip -netns "${NETNS}" link set lo up
|
||||
ip netns exec "${NETNS}" sysctl -w net.ipv4.ipfrag_high_thresh=9000000 &> /dev/null
|
||||
ip netns exec "${NETNS}" sysctl -w net.ipv4.ipfrag_low_thresh=7000000 &> /dev/null
|
||||
ip netns exec "${NETNS}" sysctl -w net.ipv6.ip6frag_high_thresh=9000000 &> /dev/null
|
||||
ip netns exec "${NETNS}" sysctl -w net.ipv6.ip6frag_low_thresh=7000000 &> /dev/null
|
||||
}
|
||||
export -f run_v4
|
||||
|
||||
./in_netns.sh "run_v4"
|
||||
cleanup() {
|
||||
ip netns del "${NETNS}"
|
||||
}
|
||||
|
||||
trap cleanup EXIT
|
||||
setup
|
||||
|
||||
echo "ipv4 defrag"
|
||||
ip netns exec "${NETNS}" ./ip_defrag -4
|
||||
|
||||
|
||||
echo "ipv4 defrag with overlaps"
|
||||
run_v4o() {
|
||||
sysctl -w net.ipv4.ipfrag_high_thresh=9000000 &> /dev/null
|
||||
sysctl -w net.ipv4.ipfrag_low_thresh=7000000 &> /dev/null
|
||||
./ip_defrag -4o
|
||||
}
|
||||
export -f run_v4o
|
||||
ip netns exec "${NETNS}" ./ip_defrag -4o
|
||||
|
||||
echo "ipv6 defrag"
|
||||
ip netns exec "${NETNS}" ./ip_defrag -6
|
||||
|
||||
echo "ipv6 defrag with overlaps"
|
||||
ip netns exec "${NETNS}" ./ip_defrag -6o
|
||||
|
||||
./in_netns.sh "run_v4o"
|
||||
|
|
|
|||
Loading…
Reference in New Issue