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179 lines
3.7 KiB
179 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Verify that consecutive sends over packet tx_ring are mirrored |
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* with their original content intact. |
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*/ |
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#define _GNU_SOURCE |
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#include <arpa/inet.h> |
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#include <assert.h> |
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#include <error.h> |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <linux/filter.h> |
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#include <linux/if_packet.h> |
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#include <net/ethernet.h> |
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#include <net/if.h> |
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#include <netinet/in.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 <pthread.h> |
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#include <sched.h> |
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#include <sys/ioctl.h> |
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#include <sys/mman.h> |
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#include <sys/socket.h> |
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#include <sys/time.h> |
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#include <sys/types.h> |
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#include <sys/utsname.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 <unistd.h> |
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const int eth_off = TPACKET_HDRLEN - sizeof(struct sockaddr_ll); |
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const int cfg_frame_size = 1000; |
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static void build_packet(void *buffer, size_t blen, char payload_char) |
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{ |
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struct udphdr *udph; |
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struct ethhdr *eth; |
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struct iphdr *iph; |
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size_t off = 0; |
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memset(buffer, 0, blen); |
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eth = buffer; |
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eth->h_proto = htons(ETH_P_IP); |
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off += sizeof(*eth); |
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iph = buffer + off; |
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iph->ttl = 8; |
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iph->ihl = 5; |
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iph->version = 4; |
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iph->saddr = htonl(INADDR_LOOPBACK); |
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iph->daddr = htonl(INADDR_LOOPBACK + 1); |
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iph->protocol = IPPROTO_UDP; |
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iph->tot_len = htons(blen - off); |
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iph->check = 0; |
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off += sizeof(*iph); |
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udph = buffer + off; |
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udph->dest = htons(8000); |
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udph->source = htons(8001); |
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udph->len = htons(blen - off); |
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udph->check = 0; |
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off += sizeof(*udph); |
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memset(buffer + off, payload_char, blen - off); |
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} |
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static int setup_rx(void) |
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{ |
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int fdr; |
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fdr = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP)); |
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if (fdr == -1) |
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error(1, errno, "socket r"); |
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return fdr; |
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} |
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static int setup_tx(char **ring) |
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{ |
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struct sockaddr_ll laddr = {}; |
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struct tpacket_req req = {}; |
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int fdt; |
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fdt = socket(PF_PACKET, SOCK_RAW, 0); |
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if (fdt == -1) |
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error(1, errno, "socket t"); |
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laddr.sll_family = AF_PACKET; |
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laddr.sll_protocol = htons(0); |
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laddr.sll_ifindex = if_nametoindex("lo"); |
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if (!laddr.sll_ifindex) |
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error(1, errno, "if_nametoindex"); |
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if (bind(fdt, (void *)&laddr, sizeof(laddr))) |
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error(1, errno, "bind fdt"); |
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req.tp_block_size = getpagesize(); |
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req.tp_block_nr = 1; |
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req.tp_frame_size = getpagesize(); |
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req.tp_frame_nr = 1; |
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if (setsockopt(fdt, SOL_PACKET, PACKET_TX_RING, |
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(void *)&req, sizeof(req))) |
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error(1, errno, "setsockopt ring"); |
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*ring = mmap(0, req.tp_block_size * req.tp_block_nr, |
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PROT_READ | PROT_WRITE, MAP_SHARED, fdt, 0); |
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if (*ring == MAP_FAILED) |
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error(1, errno, "mmap"); |
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return fdt; |
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} |
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static void send_pkt(int fdt, void *slot, char payload_char) |
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{ |
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struct tpacket_hdr *header = slot; |
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int ret; |
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while (header->tp_status != TP_STATUS_AVAILABLE) |
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usleep(1000); |
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build_packet(slot + eth_off, cfg_frame_size, payload_char); |
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header->tp_len = cfg_frame_size; |
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header->tp_status = TP_STATUS_SEND_REQUEST; |
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ret = sendto(fdt, NULL, 0, 0, NULL, 0); |
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if (ret == -1) |
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error(1, errno, "kick tx"); |
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} |
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static int read_verify_pkt(int fdr, char payload_char) |
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{ |
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char buf[100]; |
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int ret; |
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ret = read(fdr, buf, sizeof(buf)); |
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if (ret != sizeof(buf)) |
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error(1, errno, "read"); |
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if (buf[60] != payload_char) { |
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printf("wrong pattern: 0x%x != 0x%x\n", buf[60], payload_char); |
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return 1; |
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} |
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printf("read: %c (0x%x)\n", buf[60], buf[60]); |
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return 0; |
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} |
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int main(int argc, char **argv) |
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{ |
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const char payload_patterns[] = "ab"; |
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char *ring; |
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int fdr, fdt, ret = 0; |
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fdr = setup_rx(); |
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fdt = setup_tx(&ring); |
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send_pkt(fdt, ring, payload_patterns[0]); |
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send_pkt(fdt, ring, payload_patterns[1]); |
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ret |= read_verify_pkt(fdr, payload_patterns[0]); |
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ret |= read_verify_pkt(fdr, payload_patterns[1]); |
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if (close(fdt)) |
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error(1, errno, "close t"); |
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if (close(fdr)) |
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error(1, errno, "close r"); |
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return ret; |
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}
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