The test validate that GSO information are correctly exposed when reading packets from a TUN device.
Signed-off-by: Xu Du xudu@redhat.com --- v1 -> v2: - Use previous helper to simplify tunnel packet sending. - Treat read timeout (EAGAIN) as assertion failure. - Correct spelling of 'recieve' to 'receive'.
tools/testing/selftests/net/tun.c | 194 ++++++++++++++++++++++++++++++ 1 file changed, 194 insertions(+)
diff --git a/tools/testing/selftests/net/tun.c b/tools/testing/selftests/net/tun.c index ececc5ed4909..3a90e7c4bc5b 100644 --- a/tools/testing/selftests/net/tun.c +++ b/tools/testing/selftests/net/tun.c @@ -358,6 +358,116 @@ static int ip_route_check(const char *intf, int family, void *addr) return 0; }
+static int send_gso_udp_msg(int socket, struct sockaddr_storage *addr, + uint8_t *send_buf, int send_len, int gso_size) +{ + char control[CMSG_SPACE(sizeof(uint16_t))] = { 0 }; + int alen = sockaddr_len(addr->ss_family); + struct msghdr msg = { 0 }; + struct iovec iov = { 0 }; + int ret; + + iov.iov_base = send_buf; + iov.iov_len = send_len; + + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_name = addr; + msg.msg_namelen = alen; + + if (gso_size > 0) { + struct cmsghdr *cmsg; + + msg.msg_control = control; + msg.msg_controllen = sizeof(control); + + cmsg = CMSG_FIRSTHDR(&msg); + cmsg->cmsg_level = SOL_UDP; + cmsg->cmsg_type = UDP_SEGMENT; + cmsg->cmsg_len = CMSG_LEN(sizeof(uint16_t)); + *(uint16_t *)CMSG_DATA(cmsg) = gso_size; + } + + ret = sendmsg(socket, &msg, 0); + if (ret < 0) + perror("sendmsg"); + + return ret; +} + +static int validate_hdrlen(uint8_t **cur, int *len, int x) +{ + if (*len < x) + return -1; + *cur += x; + *len -= x; + return 0; +} + +static int parse_udp_tunnel_vnet_packet(uint8_t *buf, int len, int tunnel_type, + bool is_tap) +{ + struct ipv6hdr *iph6; + struct udphdr *udph; + struct iphdr *iph4; + uint8_t *cur = buf; + + if (validate_hdrlen(&cur, &len, TUN_VNET_TNL_SIZE)) + return -1; + + if (is_tap) { + if (validate_hdrlen(&cur, &len, ETH_HLEN)) + return -1; + } + + if (tunnel_type & UDP_TUNNEL_OUTER_IPV4) { + iph4 = (struct iphdr *)cur; + if (validate_hdrlen(&cur, &len, sizeof(struct iphdr))) + return -1; + if (iph4->version != 4 || iph4->protocol != IPPROTO_UDP) + return -1; + } else { + iph6 = (struct ipv6hdr *)cur; + if (validate_hdrlen(&cur, &len, sizeof(struct ipv6hdr))) + return -1; + if (iph6->version != 6 || iph6->nexthdr != IPPROTO_UDP) + return -1; + } + + udph = (struct udphdr *)cur; + if (validate_hdrlen(&cur, &len, sizeof(struct udphdr))) + return -1; + if (ntohs(udph->dest) != VN_PORT) + return -1; + + if (validate_hdrlen(&cur, &len, 8)) + return -1; + if (validate_hdrlen(&cur, &len, ETH_HLEN)) + return -1; + + if (tunnel_type & UDP_TUNNEL_INNER_IPV4) { + iph4 = (struct iphdr *)cur; + if (validate_hdrlen(&cur, &len, sizeof(struct iphdr))) + return -1; + if (iph4->version != 4 || iph4->protocol != IPPROTO_UDP) + return -1; + } else { + iph6 = (struct ipv6hdr *)cur; + if (validate_hdrlen(&cur, &len, sizeof(struct ipv6hdr))) + return -1; + if (iph6->version != 6 || iph6->nexthdr != IPPROTO_UDP) + return -1; + } + + udph = (struct udphdr *)cur; + if (validate_hdrlen(&cur, &len, sizeof(struct udphdr))) + return -1; + if (ntohs(udph->dest) != UDP_DST_PORT) + return -1; + + return len; +} + FIXTURE(tun) { char ifname[IFNAMSIZ]; @@ -685,6 +795,68 @@ receive_gso_packet_from_tunnel(FIXTURE_DATA(tun_vnet_udptnl) * self, return total_len; }
+static int send_gso_packet_into_tunnel(FIXTURE_DATA(tun_vnet_udptnl) * self, + const FIXTURE_VARIANT(tun_vnet_udptnl) * + variant) +{ + int family = (variant->tunnel_type & UDP_TUNNEL_INNER_IPV4) ? AF_INET : + AF_INET6; + uint8_t buf[MAX_VNET_TUNNEL_PACKET_SZ] = { 0 }; + int payload_len = variant->data_size; + int gso_size = variant->gso_size; + struct sockaddr_storage ssa, dsa; + + assign_sockaddr_vars(family, 0, &ssa, &dsa); + return send_gso_udp_msg(self->sock, &dsa, buf, payload_len, gso_size); +} + +static int +receive_gso_packet_from_tun(FIXTURE_DATA(tun_vnet_udptnl) * self, + const FIXTURE_VARIANT(tun_vnet_udptnl) * variant, + struct virtio_net_hdr_v1_hash_tunnel *vnet_hdr) +{ + struct timeval timeout = { .tv_sec = TIMEOUT_SEC }; + uint8_t buf[MAX_VNET_TUNNEL_PACKET_SZ]; + int tunnel_type = variant->tunnel_type; + int payload_len = variant->data_size; + bool is_tap = variant->is_tap; + int ret, len, total_len = 0; + int tun_fd = self->fd; + fd_set fdset; + + while (total_len < payload_len) { + FD_ZERO(&fdset); + FD_SET(tun_fd, &fdset); + + ret = select(tun_fd + 1, &fdset, NULL, NULL, &timeout); + if (ret <= 0) { + perror("select"); + break; + } + if (!FD_ISSET(tun_fd, &fdset)) + continue; + + len = read(tun_fd, buf, sizeof(buf)); + if (len <= 0) { + if (len < 0 && errno != EAGAIN && errno != EWOULDBLOCK) + perror("read"); + break; + } + + len = parse_udp_tunnel_vnet_packet(buf, len, tunnel_type, + is_tap); + if (len < 0) + continue; + + if (total_len == 0) + memcpy(vnet_hdr, buf, TUN_VNET_TNL_SIZE); + + total_len += len; + } + + return total_len; +} + TEST_F(tun_vnet_udptnl, send_gso_packet) { uint8_t pkt[MAX_VNET_TUNNEL_PACKET_SZ]; @@ -701,4 +873,26 @@ TEST_F(tun_vnet_udptnl, send_gso_packet) ASSERT_EQ(r_num_mss, variant->r_num_mss); }
+TEST_F(tun_vnet_udptnl, recv_gso_packet) +{ + struct virtio_net_hdr_v1_hash_tunnel vnet_hdr = { 0 }; + struct virtio_net_hdr_v1 *vh = &vnet_hdr.hash_hdr.hdr; + int ret, gso_type = VIRTIO_NET_HDR_GSO_UDP_L4; + + ret = send_gso_packet_into_tunnel(self, variant); + ASSERT_EQ(ret, variant->data_size); + + memset(&vnet_hdr, 0, sizeof(vnet_hdr)); + ret = receive_gso_packet_from_tun(self, variant, &vnet_hdr); + ASSERT_EQ(ret, variant->data_size); + + if (!variant->no_gso) { + ASSERT_EQ(vh->gso_size, variant->gso_size); + gso_type |= (variant->tunnel_type & UDP_TUNNEL_OUTER_IPV4) ? + (VIRTIO_NET_HDR_GSO_UDP_TUNNEL_IPV4) : + (VIRTIO_NET_HDR_GSO_UDP_TUNNEL_IPV6); + ASSERT_EQ(vh->gso_type, gso_type); + } +} + TEST_HARNESS_MAIN