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![luyun](/assets/img/avatar_default.png)
The psock_snd test sends and receives packets over loopback, and the test results depend on parameter settings: Set rp_filter=0, or set rp_filter=1 and accept_local=1 so that the test will pass. Otherwise, this test will fail with Resource temporarily unavailable: sudo ./psock_snd.sh dgram tx: 128 rx: 142 ./psock_snd: recv: Resource temporarily unavailable For most distro kernel releases(like Ubuntu or Centos), the parameter rp_filter is enabled by default, so it's necessary to enable the parameter lo.accept_local in psock_snd test. And this test runs inside a netns, changing a sysctl is fine. Signed-off-by: luyun <luyun@kylinos.cn> Reviewed-by: Jackie Liu <liuyun01@kylinos.cn> Tested-by: Hangbin Liu <liuhangbin@gmail.com> Acked-by: Willem de Bruijn <willemb@google.com> Link: https://lore.kernel.org/r/20220525031819.866684-1-luyun_611@163.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
399 lines
8.5 KiB
C
399 lines
8.5 KiB
C
// 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 <fcntl.h>
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#include <limits.h>
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#include <linux/filter.h>
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#include <linux/bpf.h>
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#include <linux/if_packet.h>
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#include <linux/if_vlan.h>
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#include <linux/virtio_net.h>
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#include <net/if.h>
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#include <net/ethernet.h>
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#include <netinet/ip.h>
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#include <netinet/udp.h>
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#include <poll.h>
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#include <sched.h>
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#include <stdbool.h>
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#include <stdint.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 <sys/mman.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "psock_lib.h"
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static bool cfg_use_bind;
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static bool cfg_use_csum_off;
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static bool cfg_use_csum_off_bad;
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static bool cfg_use_dgram;
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static bool cfg_use_gso;
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static bool cfg_use_qdisc_bypass;
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static bool cfg_use_vlan;
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static bool cfg_use_vnet;
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static char *cfg_ifname = "lo";
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static int cfg_mtu = 1500;
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static int cfg_payload_len = DATA_LEN;
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static int cfg_truncate_len = INT_MAX;
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static uint16_t cfg_port = 8000;
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/* test sending up to max mtu + 1 */
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#define TEST_SZ (sizeof(struct virtio_net_hdr) + ETH_HLEN + ETH_MAX_MTU + 1)
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static char tbuf[TEST_SZ], rbuf[TEST_SZ];
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static unsigned long add_csum_hword(const uint16_t *start, int num_u16)
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{
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unsigned long sum = 0;
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int i;
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for (i = 0; i < num_u16; i++)
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sum += start[i];
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return sum;
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}
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static uint16_t build_ip_csum(const uint16_t *start, int num_u16,
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unsigned long sum)
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{
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sum += add_csum_hword(start, num_u16);
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while (sum >> 16)
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sum = (sum & 0xffff) + (sum >> 16);
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return ~sum;
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}
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static int build_vnet_header(void *header)
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{
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struct virtio_net_hdr *vh = header;
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vh->hdr_len = ETH_HLEN + sizeof(struct iphdr) + sizeof(struct udphdr);
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if (cfg_use_csum_off) {
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vh->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM;
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vh->csum_start = ETH_HLEN + sizeof(struct iphdr);
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vh->csum_offset = __builtin_offsetof(struct udphdr, check);
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/* position check field exactly one byte beyond end of packet */
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if (cfg_use_csum_off_bad)
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vh->csum_start += sizeof(struct udphdr) + cfg_payload_len -
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vh->csum_offset - 1;
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}
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if (cfg_use_gso) {
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vh->gso_type = VIRTIO_NET_HDR_GSO_UDP;
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vh->gso_size = cfg_mtu - sizeof(struct iphdr);
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}
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return sizeof(*vh);
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}
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static int build_eth_header(void *header)
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{
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struct ethhdr *eth = header;
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if (cfg_use_vlan) {
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uint16_t *tag = header + ETH_HLEN;
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eth->h_proto = htons(ETH_P_8021Q);
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tag[1] = htons(ETH_P_IP);
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return ETH_HLEN + 4;
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}
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eth->h_proto = htons(ETH_P_IP);
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return ETH_HLEN;
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}
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static int build_ipv4_header(void *header, int payload_len)
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{
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struct iphdr *iph = header;
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iph->ihl = 5;
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iph->version = 4;
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iph->ttl = 8;
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iph->tot_len = htons(sizeof(*iph) + sizeof(struct udphdr) + payload_len);
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iph->id = htons(1337);
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iph->protocol = IPPROTO_UDP;
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iph->saddr = htonl((172 << 24) | (17 << 16) | 2);
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iph->daddr = htonl((172 << 24) | (17 << 16) | 1);
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iph->check = build_ip_csum((void *) iph, iph->ihl << 1, 0);
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return iph->ihl << 2;
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}
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static int build_udp_header(void *header, int payload_len)
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{
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const int alen = sizeof(uint32_t);
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struct udphdr *udph = header;
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int len = sizeof(*udph) + payload_len;
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udph->source = htons(9);
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udph->dest = htons(cfg_port);
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udph->len = htons(len);
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if (cfg_use_csum_off)
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udph->check = build_ip_csum(header - (2 * alen), alen,
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htons(IPPROTO_UDP) + udph->len);
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else
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udph->check = 0;
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return sizeof(*udph);
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}
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static int build_packet(int payload_len)
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{
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int off = 0;
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off += build_vnet_header(tbuf);
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off += build_eth_header(tbuf + off);
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off += build_ipv4_header(tbuf + off, payload_len);
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off += build_udp_header(tbuf + off, payload_len);
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if (off + payload_len > sizeof(tbuf))
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error(1, 0, "payload length exceeds max");
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memset(tbuf + off, DATA_CHAR, payload_len);
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return off + payload_len;
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}
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static void do_bind(int fd)
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{
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struct sockaddr_ll laddr = {0};
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laddr.sll_family = AF_PACKET;
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laddr.sll_protocol = htons(ETH_P_IP);
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laddr.sll_ifindex = if_nametoindex(cfg_ifname);
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if (!laddr.sll_ifindex)
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error(1, errno, "if_nametoindex");
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if (bind(fd, (void *)&laddr, sizeof(laddr)))
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error(1, errno, "bind");
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}
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static void do_send(int fd, char *buf, int len)
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{
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int ret;
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if (!cfg_use_vnet) {
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buf += sizeof(struct virtio_net_hdr);
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len -= sizeof(struct virtio_net_hdr);
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}
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if (cfg_use_dgram) {
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buf += ETH_HLEN;
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len -= ETH_HLEN;
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}
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if (cfg_use_bind) {
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ret = write(fd, buf, len);
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} else {
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struct sockaddr_ll laddr = {0};
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laddr.sll_protocol = htons(ETH_P_IP);
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laddr.sll_ifindex = if_nametoindex(cfg_ifname);
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if (!laddr.sll_ifindex)
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error(1, errno, "if_nametoindex");
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ret = sendto(fd, buf, len, 0, (void *)&laddr, sizeof(laddr));
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}
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if (ret == -1)
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error(1, errno, "write");
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if (ret != len)
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error(1, 0, "write: %u %u", ret, len);
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fprintf(stderr, "tx: %u\n", ret);
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}
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static int do_tx(void)
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{
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const int one = 1;
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int fd, len;
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fd = socket(PF_PACKET, cfg_use_dgram ? SOCK_DGRAM : SOCK_RAW, 0);
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if (fd == -1)
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error(1, errno, "socket t");
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if (cfg_use_bind)
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do_bind(fd);
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if (cfg_use_qdisc_bypass &&
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setsockopt(fd, SOL_PACKET, PACKET_QDISC_BYPASS, &one, sizeof(one)))
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error(1, errno, "setsockopt qdisc bypass");
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if (cfg_use_vnet &&
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setsockopt(fd, SOL_PACKET, PACKET_VNET_HDR, &one, sizeof(one)))
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error(1, errno, "setsockopt vnet");
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len = build_packet(cfg_payload_len);
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if (cfg_truncate_len < len)
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len = cfg_truncate_len;
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do_send(fd, tbuf, len);
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if (close(fd))
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error(1, errno, "close t");
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return len;
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}
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static int setup_rx(void)
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{
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struct timeval tv = { .tv_usec = 100 * 1000 };
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struct sockaddr_in raddr = {0};
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int fd;
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fd = socket(PF_INET, SOCK_DGRAM, 0);
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if (fd == -1)
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error(1, errno, "socket r");
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if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)))
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error(1, errno, "setsockopt rcv timeout");
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raddr.sin_family = AF_INET;
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raddr.sin_port = htons(cfg_port);
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raddr.sin_addr.s_addr = htonl(INADDR_ANY);
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if (bind(fd, (void *)&raddr, sizeof(raddr)))
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error(1, errno, "bind r");
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return fd;
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}
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static void do_rx(int fd, int expected_len, char *expected)
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{
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int ret;
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ret = recv(fd, rbuf, sizeof(rbuf), 0);
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if (ret == -1)
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error(1, errno, "recv");
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if (ret != expected_len)
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error(1, 0, "recv: %u != %u", ret, expected_len);
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if (memcmp(rbuf, expected, ret))
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error(1, 0, "recv: data mismatch");
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fprintf(stderr, "rx: %u\n", ret);
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}
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static int setup_sniffer(void)
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{
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struct timeval tv = { .tv_usec = 100 * 1000 };
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int fd;
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fd = socket(PF_PACKET, SOCK_RAW, 0);
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if (fd == -1)
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error(1, errno, "socket p");
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if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)))
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error(1, errno, "setsockopt rcv timeout");
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pair_udp_setfilter(fd);
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do_bind(fd);
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return fd;
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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, "bcCdgl:qt:vV")) != -1) {
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switch (c) {
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case 'b':
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cfg_use_bind = true;
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break;
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case 'c':
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cfg_use_csum_off = true;
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break;
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case 'C':
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cfg_use_csum_off_bad = true;
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break;
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case 'd':
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cfg_use_dgram = true;
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break;
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case 'g':
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cfg_use_gso = true;
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break;
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case 'l':
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cfg_payload_len = strtoul(optarg, NULL, 0);
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break;
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case 'q':
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cfg_use_qdisc_bypass = true;
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break;
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case 't':
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cfg_truncate_len = strtoul(optarg, NULL, 0);
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break;
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case 'v':
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cfg_use_vnet = true;
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break;
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case 'V':
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cfg_use_vlan = 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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if (cfg_use_vlan && cfg_use_dgram)
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error(1, 0, "option vlan (-V) conflicts with dgram (-d)");
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if (cfg_use_csum_off && !cfg_use_vnet)
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error(1, 0, "option csum offload (-c) requires vnet (-v)");
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if (cfg_use_csum_off_bad && !cfg_use_csum_off)
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error(1, 0, "option csum bad (-C) requires csum offload (-c)");
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if (cfg_use_gso && !cfg_use_csum_off)
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error(1, 0, "option gso (-g) requires csum offload (-c)");
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}
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static void run_test(void)
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{
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int fdr, fds, total_len;
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fdr = setup_rx();
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fds = setup_sniffer();
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total_len = do_tx();
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/* BPF filter accepts only this length, vlan changes MAC */
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if (cfg_payload_len == DATA_LEN && !cfg_use_vlan)
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do_rx(fds, total_len - sizeof(struct virtio_net_hdr),
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tbuf + sizeof(struct virtio_net_hdr));
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do_rx(fdr, cfg_payload_len, tbuf + total_len - cfg_payload_len);
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if (close(fds))
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error(1, errno, "close s");
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if (close(fdr))
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error(1, errno, "close r");
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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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if (system("ip link set dev lo mtu 1500"))
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error(1, errno, "ip link set mtu");
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if (system("ip addr add dev lo 172.17.0.1/24"))
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error(1, errno, "ip addr add");
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if (system("sysctl -w net.ipv4.conf.lo.accept_local=1"))
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error(1, errno, "sysctl lo.accept_local");
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run_test();
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fprintf(stderr, "OK\n\n");
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return 0;
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}
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