1 files changed, 0 insertions, 986 deletions

diff --git a/tools/testing/selftests/net/csum.c b/tools/testing/selftests/net/csum.c
deleted file mode 100644
index 82a1c1839da6..000000000000
--- a/tools/testing/selftests/net/csum.c
+++ /dev/null
@@ -1,986 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-/* Test hardware checksum offload: Rx + Tx, IPv4 + IPv6, TCP + UDP.
- *
- * The test runs on two machines to exercise the NIC. For this reason it
- * is not integrated in kselftests.
- *
- *     CMD=$((./csum -[46] -[tu] -S $SADDR -D $DADDR -[RT] -r 1 $EXTRA_ARGS))
- *
- * Rx:
- *
- * The sender sends packets with a known checksum field using PF_INET(6)
- * SOCK_RAW sockets.
- *
- * good packet: $CMD [-t]
- * bad packet:  $CMD [-t] -E
- *
- * The receiver reads UDP packets with a UDP socket. This is not an
- * option for TCP packets ('-t'). Optionally insert an iptables filter
- * to avoid these entering the real protocol stack.
- *
- * The receiver also reads all packets with a PF_PACKET socket, to
- * observe whether both good and bad packets arrive on the host. And to
- * read the optional TP_STATUS_CSUM_VALID bit. This requires setting
- * option PACKET_AUXDATA, and works only for CHECKSUM_UNNECESSARY.
- *
- * Tx:
- *
- * The sender needs to build CHECKSUM_PARTIAL packets to exercise tx
- * checksum offload.
- *
- * The sender can sends packets with a UDP socket.
- *
- * Optionally crafts a packet that sums up to zero to verify that the
- * device writes negative zero 0xFFFF in this case to distinguish from
- * 0x0000 (checksum disabled), as required by RFC 768. Hit this case
- * by choosing a specific source port.
- *
- * good packet: $CMD -U
- * zero csum:   $CMD -U -Z
- *
- * The sender can also build packets with PF_PACKET with PACKET_VNET_HDR,
- * to cover more protocols. PF_PACKET requires passing src and dst mac
- * addresses.
- *
- * good packet: $CMD -s $smac -d $dmac -p [-t]
- *
- * Argument '-z' sends UDP packets with a 0x000 checksum disabled field,
- * to verify that the NIC passes these packets unmodified.
- *
- * Argument '-e' adds a transport mode encapsulation header between
- * network and transport header. This will fail for devices that parse
- *  headers. Should work on devices that implement protocol agnostic tx
- * checksum offload (NETIF_F_HW_CSUM).
- *
- * Argument '-r $SEED' optionally randomizes header, payload and length
- * to increase coverage between packets sent. SEED 1 further chooses a
- * different seed for each run (and logs this for reproducibility). It
- * is advised to enable this for extra coverage in continuous testing.
- */
-
-#define _GNU_SOURCE
-
-#include <arpa/inet.h>
-#include <asm/byteorder.h>
-#include <errno.h>
-#include <error.h>
-#include <linux/filter.h>
-#include <linux/if_packet.h>
-#include <linux/ipv6.h>
-#include <linux/virtio_net.h>
-#include <net/ethernet.h>
-#include <net/if.h>
-#include <netinet/if_ether.h>
-#include <netinet/in.h>
-#include <netinet/ip.h>
-#include <netinet/ip6.h>
-#include <netinet/tcp.h>
-#include <netinet/udp.h>
-#include <poll.h>
-#include <sched.h>
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-static bool cfg_bad_csum;
-static int cfg_family = PF_INET6;
-static int cfg_num_pkt = 4;
-static bool cfg_do_rx = true;
-static bool cfg_do_tx = true;
-static bool cfg_encap;
-static char *cfg_ifname = "eth0";
-static char *cfg_mac_dst;
-static char *cfg_mac_src;
-static int cfg_proto = IPPROTO_UDP;
-static int cfg_payload_char = 'a';
-static int cfg_payload_len = 100;
-static uint16_t cfg_port_dst = 34000;
-static uint16_t cfg_port_src = 33000;
-static uint16_t cfg_port_src_encap = 33001;
-static unsigned int cfg_random_seed;
-static int cfg_rcvbuf = 1 << 22;	/* be able to queue large cfg_num_pkt */
-static bool cfg_send_pfpacket;
-static bool cfg_send_udp;
-static int cfg_timeout_ms = 2000;
-static bool cfg_zero_disable; /* skip checksum: set to zero (udp only) */
-static bool cfg_zero_sum;     /* create packet that adds up to zero */
-
-static struct sockaddr_in cfg_daddr4 = {.sin_family = AF_INET};
-static struct sockaddr_in cfg_saddr4 = {.sin_family = AF_INET};
-static struct sockaddr_in6 cfg_daddr6 = {.sin6_family = AF_INET6};
-static struct sockaddr_in6 cfg_saddr6 = {.sin6_family = AF_INET6};
-
-#define ENC_HEADER_LEN	(sizeof(struct udphdr) + sizeof(struct udp_encap_hdr))
-#define MAX_HEADER_LEN	(sizeof(struct ipv6hdr) + ENC_HEADER_LEN + sizeof(struct tcphdr))
-#define MAX_PAYLOAD_LEN 1024
-
-/* Trivial demo encap. Stand-in for transport layer protocols like ESP or PSP */
-struct udp_encap_hdr {
-	uint8_t nexthdr;
-	uint8_t padding[3];
-};
-
-/* Ipaddrs, for pseudo csum. Global var is ugly, pass through funcs was worse */
-static void *iph_addr_p;
-
-static unsigned long gettimeofday_ms(void)
-{
-	struct timeval tv;
-
-	gettimeofday(&tv, NULL);
-	return (tv.tv_sec * 1000UL) + (tv.tv_usec / 1000UL);
-}
-
-static uint32_t checksum_nofold(char *data, size_t len, uint32_t sum)
-{
-	uint16_t *words = (uint16_t *)data;
-	int i;
-
-	for (i = 0; i < len / 2; i++)
-		sum += words[i];
-
-	if (len & 1)
-		sum += ((unsigned char *)data)[len - 1];
-
-	return sum;
-}
-
-static uint16_t checksum_fold(void *data, size_t len, uint32_t sum)
-{
-	sum = checksum_nofold(data, len, sum);
-
-	while (sum > 0xFFFF)
-		sum = (sum & 0xFFFF) + (sum >> 16);
-
-	return ~sum;
-}
-
-static uint16_t checksum(void *th, uint16_t proto, size_t len)
-{
-	uint32_t sum;
-	int alen;
-
-	alen = cfg_family == PF_INET6 ? 32 : 8;
-
-	sum = checksum_nofold(iph_addr_p, alen, 0);
-	sum += htons(proto);
-	sum += htons(len);
-
-	/* With CHECKSUM_PARTIAL kernel expects non-inverted pseudo csum */
-	if (cfg_do_tx && cfg_send_pfpacket)
-		return ~checksum_fold(NULL, 0, sum);
-	else
-		return checksum_fold(th, len, sum);
-}
-
-static void *build_packet_ipv4(void *_iph, uint8_t proto, unsigned int len)
-{
-	struct iphdr *iph = _iph;
-
-	memset(iph, 0, sizeof(*iph));
-
-	iph->version = 4;
-	iph->ihl = 5;
-	iph->ttl = 8;
-	iph->protocol = proto;
-	iph->saddr = cfg_saddr4.sin_addr.s_addr;
-	iph->daddr = cfg_daddr4.sin_addr.s_addr;
-	iph->tot_len = htons(sizeof(*iph) + len);
-	iph->check = checksum_fold(iph, sizeof(*iph), 0);
-
-	iph_addr_p = &iph->saddr;
-
-	return iph + 1;
-}
-
-static void *build_packet_ipv6(void *_ip6h, uint8_t proto, unsigned int len)
-{
-	struct ipv6hdr *ip6h = _ip6h;
-
-	memset(ip6h, 0, sizeof(*ip6h));
-
-	ip6h->version = 6;
-	ip6h->payload_len = htons(len);
-	ip6h->nexthdr = proto;
-	ip6h->hop_limit = 64;
-	ip6h->saddr = cfg_saddr6.sin6_addr;
-	ip6h->daddr = cfg_daddr6.sin6_addr;
-
-	iph_addr_p = &ip6h->saddr;
-
-	return ip6h + 1;
-}
-
-static void *build_packet_udp(void *_uh)
-{
-	struct udphdr *uh = _uh;
-
-	uh->source = htons(cfg_port_src);
-	uh->dest = htons(cfg_port_dst);
-	uh->len = htons(sizeof(*uh) + cfg_payload_len);
-	uh->check = 0;
-
-	/* choose source port so that uh->check adds up to zero */
-	if (cfg_zero_sum) {
-		uh->source = 0;
-		uh->source = checksum(uh, IPPROTO_UDP, sizeof(*uh) + cfg_payload_len);
-
-		fprintf(stderr, "tx: changing sport: %hu -> %hu\n",
-			cfg_port_src, ntohs(uh->source));
-		cfg_port_src = ntohs(uh->source);
-	}
-
-	if (cfg_zero_disable)
-		uh->check = 0;
-	else
-		uh->check = checksum(uh, IPPROTO_UDP, sizeof(*uh) + cfg_payload_len);
-
-	if (cfg_bad_csum)
-		uh->check = ~uh->check;
-
-	fprintf(stderr, "tx: sending checksum: 0x%x\n", uh->check);
-	return uh + 1;
-}
-
-static void *build_packet_tcp(void *_th)
-{
-	struct tcphdr *th = _th;
-
-	th->source = htons(cfg_port_src);
-	th->dest = htons(cfg_port_dst);
-	th->doff = 5;
-	th->check = 0;
-
-	th->check = checksum(th, IPPROTO_TCP, sizeof(*th) + cfg_payload_len);
-
-	if (cfg_bad_csum)
-		th->check = ~th->check;
-
-	fprintf(stderr, "tx: sending checksum: 0x%x\n", th->check);
-	return th + 1;
-}
-
-static char *build_packet_udp_encap(void *_uh)
-{
-	struct udphdr *uh = _uh;
-	struct udp_encap_hdr *eh = _uh + sizeof(*uh);
-
-	/* outer dst == inner dst, to simplify BPF filter
-	 * outer src != inner src, to demultiplex on recv
-	 */
-	uh->dest = htons(cfg_port_dst);
-	uh->source = htons(cfg_port_src_encap);
-	uh->check = 0;
-	uh->len = htons(sizeof(*uh) +
-			sizeof(*eh) +
-			sizeof(struct tcphdr) +
-			cfg_payload_len);
-
-	eh->nexthdr = IPPROTO_TCP;
-
-	return build_packet_tcp(eh + 1);
-}
-
-static char *build_packet(char *buf, int max_len, int *len)
-{
-	uint8_t proto;
-	char *off;
-	int tlen;
-
-	if (cfg_random_seed) {
-		int *buf32 = (void *)buf;
-		int i;
-
-		for (i = 0; i < (max_len / sizeof(int)); i++)
-			buf32[i] = rand();
-	} else {
-		memset(buf, cfg_payload_char, max_len);
-	}
-
-	if (cfg_proto == IPPROTO_UDP)
-		tlen = sizeof(struct udphdr) + cfg_payload_len;
-	else
-		tlen = sizeof(struct tcphdr) + cfg_payload_len;
-
-	if (cfg_encap) {
-		proto = IPPROTO_UDP;
-		tlen += ENC_HEADER_LEN;
-	} else {
-		proto = cfg_proto;
-	}
-
-	if (cfg_family == PF_INET)
-		off = build_packet_ipv4(buf, proto, tlen);
-	else
-		off = build_packet_ipv6(buf, proto, tlen);
-
-	if (cfg_encap)
-		off = build_packet_udp_encap(off);
-	else if (cfg_proto == IPPROTO_UDP)
-		off = build_packet_udp(off);
-	else
-		off = build_packet_tcp(off);
-
-	/* only pass the payload, but still compute headers for cfg_zero_sum */
-	if (cfg_send_udp) {
-		*len = cfg_payload_len;
-		return off;
-	}
-
-	*len = off - buf + cfg_payload_len;
-	return buf;
-}
-
-static int open_inet(int ipproto, int protocol)
-{
-	int fd;
-
-	fd = socket(cfg_family, ipproto, protocol);
-	if (fd == -1)
-		error(1, errno, "socket inet");
-
-	if (cfg_family == PF_INET6) {
-		/* may have been updated by cfg_zero_sum */
-		cfg_saddr6.sin6_port = htons(cfg_port_src);
-
-		if (bind(fd, (void *)&cfg_saddr6, sizeof(cfg_saddr6)))
-			error(1, errno, "bind dgram 6");
-		if (connect(fd, (void *)&cfg_daddr6, sizeof(cfg_daddr6)))
-			error(1, errno, "connect dgram 6");
-	} else {
-		/* may have been updated by cfg_zero_sum */
-		cfg_saddr4.sin_port = htons(cfg_port_src);
-
-		if (bind(fd, (void *)&cfg_saddr4, sizeof(cfg_saddr4)))
-			error(1, errno, "bind dgram 4");
-		if (connect(fd, (void *)&cfg_daddr4, sizeof(cfg_daddr4)))
-			error(1, errno, "connect dgram 4");
-	}
-
-	return fd;
-}
-
-static int open_packet(void)
-{
-	int fd, one = 1;
-
-	fd = socket(PF_PACKET, SOCK_RAW, 0);
-	if (fd == -1)
-		error(1, errno, "socket packet");
-
-	if (setsockopt(fd, SOL_PACKET, PACKET_VNET_HDR, &one, sizeof(one)))
-		error(1, errno, "setsockopt packet_vnet_ndr");
-
-	return fd;
-}
-
-static void send_inet(int fd, const char *buf, int len)
-{
-	int ret;
-
-	ret = write(fd, buf, len);
-	if (ret == -1)
-		error(1, errno, "write");
-	if (ret != len)
-		error(1, 0, "write: %d", ret);
-}
-
-static void eth_str_to_addr(const char *str, unsigned char *eth)
-{
-	if (sscanf(str, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
-		   &eth[0], &eth[1], &eth[2], &eth[3], &eth[4], &eth[5]) != 6)
-		error(1, 0, "cannot parse mac addr %s", str);
-}
-
-static void send_packet(int fd, const char *buf, int len)
-{
-	struct virtio_net_hdr vh = {0};
-	struct sockaddr_ll addr = {0};
-	struct msghdr msg = {0};
-	struct ethhdr eth;
-	struct iovec iov[3];
-	int ret;
-
-	addr.sll_family = AF_PACKET;
-	addr.sll_halen = ETH_ALEN;
-	addr.sll_ifindex = if_nametoindex(cfg_ifname);
-	if (!addr.sll_ifindex)
-		error(1, errno, "if_nametoindex %s", cfg_ifname);
-
-	vh.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
-	if (cfg_family == PF_INET6) {
-		vh.csum_start = sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
-		addr.sll_protocol = htons(ETH_P_IPV6);
-	} else {
-		vh.csum_start = sizeof(struct ethhdr) + sizeof(struct iphdr);
-		addr.sll_protocol = htons(ETH_P_IP);
-	}
-
-	if (cfg_encap)
-		vh.csum_start += ENC_HEADER_LEN;
-
-	if (cfg_proto == IPPROTO_TCP) {
-		vh.csum_offset = __builtin_offsetof(struct tcphdr, check);
-		vh.hdr_len = vh.csum_start + sizeof(struct tcphdr);
-	} else {
-		vh.csum_offset = __builtin_offsetof(struct udphdr, check);
-		vh.hdr_len = vh.csum_start + sizeof(struct udphdr);
-	}
-
-	eth_str_to_addr(cfg_mac_src, eth.h_source);
-	eth_str_to_addr(cfg_mac_dst, eth.h_dest);
-	eth.h_proto = addr.sll_protocol;
-
-	iov[0].iov_base = &vh;
-	iov[0].iov_len = sizeof(vh);
-
-	iov[1].iov_base = &eth;
-	iov[1].iov_len = sizeof(eth);
-
-	iov[2].iov_base = (void *)buf;
-	iov[2].iov_len = len;
-
-	msg.msg_iov = iov;
-	msg.msg_iovlen = sizeof(iov) / sizeof(iov[0]);
-
-	msg.msg_name = &addr;
-	msg.msg_namelen = sizeof(addr);
-
-	ret = sendmsg(fd, &msg, 0);
-	if (ret == -1)
-		error(1, errno, "sendmsg packet");
-	if (ret != sizeof(vh) + sizeof(eth) + len)
-		error(1, errno, "sendmsg packet: %u", ret);
-}
-
-static int recv_prepare_udp(void)
-{
-	int fd;
-
-	fd = socket(cfg_family, SOCK_DGRAM, 0);
-	if (fd == -1)
-		error(1, errno, "socket r");
-
-	if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
-		       &cfg_rcvbuf, sizeof(cfg_rcvbuf)))
-		error(1, errno, "setsockopt SO_RCVBUF r");
-
-	if (cfg_family == PF_INET6) {
-		if (bind(fd, (void *)&cfg_daddr6, sizeof(cfg_daddr6)))
-			error(1, errno, "bind r");
-	} else {
-		if (bind(fd, (void *)&cfg_daddr4, sizeof(cfg_daddr4)))
-			error(1, errno, "bind r");
-	}
-
-	return fd;
-}
-
-/* Filter out all traffic that is not cfg_proto with our destination port.
- *
- * Otherwise background noise may cause PF_PACKET receive queue overflow,
- * dropping the expected packets and failing the test.
- */
-static void __recv_prepare_packet_filter(int fd, int off_nexthdr, int off_dport)
-{
-	struct sock_filter filter[] = {
-		BPF_STMT(BPF_LD + BPF_B + BPF_ABS, SKF_AD_OFF + SKF_AD_PKTTYPE),
-		BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, PACKET_HOST, 0, 4),
-		BPF_STMT(BPF_LD + BPF_B + BPF_ABS, off_nexthdr),
-		BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, cfg_encap ? IPPROTO_UDP : cfg_proto, 0, 2),
-		BPF_STMT(BPF_LD + BPF_H + BPF_ABS, off_dport),
-		BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, cfg_port_dst, 1, 0),
-		BPF_STMT(BPF_RET + BPF_K, 0),
-		BPF_STMT(BPF_RET + BPF_K, 0xFFFF),
-	};
-	struct sock_fprog prog = {};
-
-	prog.filter = filter;
-	prog.len = sizeof(filter) / sizeof(struct sock_filter);
-	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &prog, sizeof(prog)))
-		error(1, errno, "setsockopt filter");
-}
-
-static void recv_prepare_packet_filter(int fd)
-{
-	const int off_dport = offsetof(struct tcphdr, dest); /* same for udp */
-
-	if (cfg_family == AF_INET)
-		__recv_prepare_packet_filter(fd, offsetof(struct iphdr, protocol),
-					     sizeof(struct iphdr) + off_dport);
-	else
-		__recv_prepare_packet_filter(fd, offsetof(struct ipv6hdr, nexthdr),
-					     sizeof(struct ipv6hdr) + off_dport);
-}
-
-static void recv_prepare_packet_bind(int fd)
-{
-	struct sockaddr_ll laddr = {0};
-
-	laddr.sll_family = AF_PACKET;
-
-	if (cfg_family == PF_INET)
-		laddr.sll_protocol = htons(ETH_P_IP);
-	else
-		laddr.sll_protocol = htons(ETH_P_IPV6);
-
-	laddr.sll_ifindex = if_nametoindex(cfg_ifname);
-	if (!laddr.sll_ifindex)
-		error(1, 0, "if_nametoindex %s", cfg_ifname);
-
-	if (bind(fd, (void *)&laddr, sizeof(laddr)))
-		error(1, errno, "bind pf_packet");
-}
-
-static int recv_prepare_packet(void)
-{
-	int fd, one = 1;
-
-	fd = socket(PF_PACKET, SOCK_DGRAM, 0);
-	if (fd == -1)
-		error(1, errno, "socket p");
-
-	if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
-		       &cfg_rcvbuf, sizeof(cfg_rcvbuf)))
-		error(1, errno, "setsockopt SO_RCVBUF p");
-
-	/* enable auxdata to recv checksum status (valid vs unknown) */
-	if (setsockopt(fd, SOL_PACKET, PACKET_AUXDATA, &one, sizeof(one)))
-		error(1, errno, "setsockopt auxdata");
-
-	/* install filter to restrict packet flow to match */
-	recv_prepare_packet_filter(fd);
-
-	/* bind to address family to start packet flow */
-	recv_prepare_packet_bind(fd);
-
-	return fd;
-}
-
-static int recv_udp(int fd)
-{
-	static char buf[MAX_PAYLOAD_LEN];
-	int ret, count = 0;
-
-	while (1) {
-		ret = recv(fd, buf, sizeof(buf), MSG_DONTWAIT);
-		if (ret == -1 && errno == EAGAIN)
-			break;
-		if (ret == -1)
-			error(1, errno, "recv r");
-
-		fprintf(stderr, "rx: udp: len=%u\n", ret);
-		count++;
-	}
-
-	return count;
-}
-
-static int recv_verify_csum(void *th, int len, uint16_t sport, uint16_t csum_field)
-{
-	uint16_t csum;
-
-	csum = checksum(th, cfg_proto, len);
-
-	fprintf(stderr, "rx: pkt: sport=%hu len=%u csum=0x%hx verify=0x%hx\n",
-		sport, len, csum_field, csum);
-
-	/* csum must be zero unless cfg_bad_csum indicates bad csum */
-	if (csum && !cfg_bad_csum) {
-		fprintf(stderr, "pkt: bad csum\n");
-		return 1;
-	} else if (cfg_bad_csum && !csum) {
-		fprintf(stderr, "pkt: good csum, while bad expected\n");
-		return 1;
-	}
-
-	if (cfg_zero_sum && csum_field != 0xFFFF) {
-		fprintf(stderr, "pkt: zero csum: field should be 0xFFFF, is 0x%hx\n", csum_field);
-		return 1;
-	}
-
-	return 0;
-}
-
-static int recv_verify_packet_tcp(void *th, int len)
-{
-	struct tcphdr *tcph = th;
-
-	if (len < sizeof(*tcph) || tcph->dest != htons(cfg_port_dst))
-		return -1;
-
-	return recv_verify_csum(th, len, ntohs(tcph->source), tcph->check);
-}
-
-static int recv_verify_packet_udp_encap(void *th, int len)
-{
-	struct udp_encap_hdr *eh = th;
-
-	if (len < sizeof(*eh) || eh->nexthdr != IPPROTO_TCP)
-		return -1;
-
-	return recv_verify_packet_tcp(eh + 1, len - sizeof(*eh));
-}
-
-static int recv_verify_packet_udp(void *th, int len)
-{
-	struct udphdr *udph = th;
-
-	if (len < sizeof(*udph))
-		return -1;
-
-	if (udph->dest != htons(cfg_port_dst))
-		return -1;
-
-	if (udph->source == htons(cfg_port_src_encap))
-		return recv_verify_packet_udp_encap(udph + 1,
-						    len - sizeof(*udph));
-
-	return recv_verify_csum(th, len, ntohs(udph->source), udph->check);
-}
-
-static int recv_verify_packet_ipv4(void *nh, int len)
-{
-	struct iphdr *iph = nh;
-	uint16_t proto = cfg_encap ? IPPROTO_UDP : cfg_proto;
-
-	if (len < sizeof(*iph) || iph->protocol != proto)
-		return -1;
-
-	iph_addr_p = &iph->saddr;
-	if (proto == IPPROTO_TCP)
-		return recv_verify_packet_tcp(iph + 1, len - sizeof(*iph));
-	else
-		return recv_verify_packet_udp(iph + 1, len - sizeof(*iph));
-}
-
-static int recv_verify_packet_ipv6(void *nh, int len)
-{
-	struct ipv6hdr *ip6h = nh;
-	uint16_t proto = cfg_encap ? IPPROTO_UDP : cfg_proto;
-
-	if (len < sizeof(*ip6h) || ip6h->nexthdr != proto)
-		return -1;
-
-	iph_addr_p = &ip6h->saddr;
-
-	if (proto == IPPROTO_TCP)
-		return recv_verify_packet_tcp(ip6h + 1, len - sizeof(*ip6h));
-	else
-		return recv_verify_packet_udp(ip6h + 1, len - sizeof(*ip6h));
-}
-
-/* return whether auxdata includes TP_STATUS_CSUM_VALID */
-static bool recv_verify_packet_csum(struct msghdr *msg)
-{
-	struct tpacket_auxdata *aux = NULL;
-	struct cmsghdr *cm;
-
-	if (msg->msg_flags & MSG_CTRUNC)
-		error(1, 0, "cmsg: truncated");
-
-	for (cm = CMSG_FIRSTHDR(msg); cm; cm = CMSG_NXTHDR(msg, cm)) {
-		if (cm->cmsg_level != SOL_PACKET ||
-		    cm->cmsg_type != PACKET_AUXDATA)
-			error(1, 0, "cmsg: level=%d type=%d\n",
-			      cm->cmsg_level, cm->cmsg_type);
-
-		if (cm->cmsg_len != CMSG_LEN(sizeof(struct tpacket_auxdata)))
-			error(1, 0, "cmsg: len=%lu expected=%lu",
-			      cm->cmsg_len, CMSG_LEN(sizeof(struct tpacket_auxdata)));
-
-		aux = (void *)CMSG_DATA(cm);
-	}
-
-	if (!aux)
-		error(1, 0, "cmsg: no auxdata");
-
-	return aux->tp_status & TP_STATUS_CSUM_VALID;
-}
-
-static int recv_packet(int fd)
-{
-	static char _buf[MAX_HEADER_LEN + MAX_PAYLOAD_LEN];
-	unsigned long total = 0, bad_csums = 0, bad_validations = 0;
-	char ctrl[CMSG_SPACE(sizeof(struct tpacket_auxdata))];
-	struct pkt *buf = (void *)_buf;
-	struct msghdr msg = {0};
-	struct iovec iov;
-	int len, ret;
-
-	iov.iov_base = _buf;
-	iov.iov_len = sizeof(_buf);
-
-	msg.msg_iov = &iov;
-	msg.msg_iovlen = 1;
-
-	msg.msg_control = ctrl;
-	msg.msg_controllen = sizeof(ctrl);
-
-	while (1) {
-		msg.msg_flags = 0;
-
-		len = recvmsg(fd, &msg, MSG_DONTWAIT);
-		if (len == -1 && errno == EAGAIN)
-			break;
-		if (len == -1)
-			error(1, errno, "recv p");
-
-		if (cfg_family == PF_INET6)
-			ret = recv_verify_packet_ipv6(buf, len);
-		else
-			ret = recv_verify_packet_ipv4(buf, len);
-
-		if (ret == -1 /* skip: non-matching */)
-			continue;
-
-		total++;
-		if (ret == 1)
-			bad_csums++;
-
-		/* Fail if kernel returns valid for known bad csum.
-		 * Do not fail if kernel does not validate a good csum:
-		 * Absence of validation does not imply invalid.
-		 */
-		if (recv_verify_packet_csum(&msg) && cfg_bad_csum) {
-			fprintf(stderr, "cmsg: expected bad csum, pf_packet returns valid\n");
-			bad_validations++;
-		}
-	}
-
-	if (bad_csums || bad_validations)
-		error(1, 0, "rx: errors at pf_packet: total=%lu bad_csums=%lu bad_valids=%lu\n",
-		      total, bad_csums, bad_validations);
-
-	return total;
-}
-
-static void parse_args(int argc, char *const argv[])
-{
-	const char *daddr = NULL, *saddr = NULL;
-	int c;
-
-	while ((c = getopt(argc, argv, "46d:D:eEi:l:L:n:r:PRs:S:tTuUzZ")) != -1) {
-		switch (c) {
-		case '4':
-			cfg_family = PF_INET;
-			break;
-		case '6':
-			cfg_family = PF_INET6;
-			break;
-		case 'd':
-			cfg_mac_dst = optarg;
-			break;
-		case 'D':
-			daddr = optarg;
-			break;
-		case 'e':
-			cfg_encap = true;
-			break;
-		case 'E':
-			cfg_bad_csum = true;
-			break;
-		case 'i':
-			cfg_ifname = optarg;
-			break;
-		case 'l':
-			cfg_payload_len = strtol(optarg, NULL, 0);
-			break;
-		case 'L':
-			cfg_timeout_ms = strtol(optarg, NULL, 0) * 1000;
-			break;
-		case 'n':
-			cfg_num_pkt = strtol(optarg, NULL, 0);
-			break;
-		case 'r':
-			cfg_random_seed = strtol(optarg, NULL, 0);
-			break;
-		case 'P':
-			cfg_send_pfpacket = true;
-			break;
-		case 'R':
-			/* only Rx: used with two machine tests */
-			cfg_do_tx = false;
-			break;
-		case 's':
-			cfg_mac_src = optarg;
-			break;
-		case 'S':
-			saddr = optarg;
-			break;
-		case 't':
-			cfg_proto = IPPROTO_TCP;
-			break;
-		case 'T':
-			/* only Tx: used with two machine tests */
-			cfg_do_rx = false;
-			break;
-		case 'u':
-			cfg_proto = IPPROTO_UDP;
-			break;
-		case 'U':
-			/* send using real udp socket,
-			 * to exercise tx checksum offload
-			 */
-			cfg_send_udp = true;
-			break;
-		case 'z':
-			cfg_zero_disable = true;
-			break;
-		case 'Z':
-			cfg_zero_sum = true;
-			break;
-		default:
-			error(1, 0, "unknown arg %c", c);
-		}
-	}
-
-	if (!daddr || !saddr)
-		error(1, 0, "Must pass -D <daddr> and -S <saddr>");
-
-	if (cfg_do_tx && cfg_send_pfpacket && (!cfg_mac_src || !cfg_mac_dst))
-		error(1, 0, "Transmit with pf_packet requires mac addresses");
-
-	if (cfg_payload_len > MAX_PAYLOAD_LEN)
-		error(1, 0, "Payload length exceeds max");
-
-	if (cfg_proto != IPPROTO_UDP && (cfg_zero_sum || cfg_zero_disable))
-		error(1, 0, "Only UDP supports zero csum");
-
-	if (cfg_zero_sum && !cfg_send_udp)
-		error(1, 0, "Zero checksum conversion requires -U for tx csum offload");
-	if (cfg_zero_sum && cfg_bad_csum)
-		error(1, 0, "Cannot combine zero checksum conversion and invalid checksum");
-	if (cfg_zero_sum && cfg_random_seed)
-		error(1, 0, "Cannot combine zero checksum conversion with randomization");
-
-	if (cfg_family == PF_INET6) {
-		cfg_saddr6.sin6_port = htons(cfg_port_src);
-		cfg_daddr6.sin6_port = htons(cfg_port_dst);
-
-		if (inet_pton(cfg_family, daddr, &cfg_daddr6.sin6_addr) != 1)
-			error(1, errno, "Cannot parse ipv6 -D");
-		if (inet_pton(cfg_family, saddr, &cfg_saddr6.sin6_addr) != 1)
-			error(1, errno, "Cannot parse ipv6 -S");
-	} else {
-		cfg_saddr4.sin_port = htons(cfg_port_src);
-		cfg_daddr4.sin_port = htons(cfg_port_dst);
-
-		if (inet_pton(cfg_family, daddr, &cfg_daddr4.sin_addr) != 1)
-			error(1, errno, "Cannot parse ipv4 -D");
-		if (inet_pton(cfg_family, saddr, &cfg_saddr4.sin_addr) != 1)
-			error(1, errno, "Cannot parse ipv4 -S");
-	}
-
-	if (cfg_do_tx && cfg_random_seed) {
-		/* special case: time-based seed */
-		if (cfg_random_seed == 1)
-			cfg_random_seed = (unsigned int)gettimeofday_ms();
-		srand(cfg_random_seed);
-		fprintf(stderr, "randomization seed: %u\n", cfg_random_seed);
-	}
-}
-
-static void do_tx(void)
-{
-	static char _buf[MAX_HEADER_LEN + MAX_PAYLOAD_LEN];
-	char *buf;
-	int fd, len, i;
-
-	buf = build_packet(_buf, sizeof(_buf), &len);
-
-	if (cfg_send_pfpacket)
-		fd = open_packet();
-	else if (cfg_send_udp)
-		fd = open_inet(SOCK_DGRAM, 0);
-	else
-		fd = open_inet(SOCK_RAW, IPPROTO_RAW);
-
-	for (i = 0; i < cfg_num_pkt; i++) {
-		if (cfg_send_pfpacket)
-			send_packet(fd, buf, len);
-		else
-			send_inet(fd, buf, len);
-
-		/* randomize each packet individually to increase coverage */
-		if (cfg_random_seed) {
-			cfg_payload_len = rand() % MAX_PAYLOAD_LEN;
-			buf = build_packet(_buf, sizeof(_buf), &len);
-		}
-	}
-
-	if (close(fd))
-		error(1, errno, "close tx");
-}
-
-static void do_rx(int fdp, int fdr)
-{
-	unsigned long count_udp = 0, count_pkt = 0;
-	long tleft, tstop;
-	struct pollfd pfd;
-
-	tstop = gettimeofday_ms() + cfg_timeout_ms;
-	tleft = cfg_timeout_ms;
-
-	do {
-		pfd.events = POLLIN;
-		pfd.fd = fdp;
-		if (poll(&pfd, 1, tleft) == -1)
-			error(1, errno, "poll");
-
-		if (pfd.revents & POLLIN)
-			count_pkt += recv_packet(fdp);
-
-		if (cfg_proto == IPPROTO_UDP)
-			count_udp += recv_udp(fdr);
-
-		tleft = tstop - gettimeofday_ms();
-	} while (tleft > 0);
-
-	if (close(fdr))
-		error(1, errno, "close r");
-	if (close(fdp))
-		error(1, errno, "close p");
-
-	if (count_pkt < cfg_num_pkt)
-		error(1, 0, "rx: missing packets at pf_packet: %lu < %u",
-		      count_pkt, cfg_num_pkt);
-
-	if (cfg_proto == IPPROTO_UDP) {
-		if (cfg_bad_csum && count_udp)
-			error(1, 0, "rx: unexpected packets at udp");
-		if (!cfg_bad_csum && !count_udp)
-			error(1, 0, "rx: missing packets at udp");
-	}
-}
-
-int main(int argc, char *const argv[])
-{
-	int fdp = -1, fdr = -1;		/* -1 to silence -Wmaybe-uninitialized */
-
-	parse_args(argc, argv);
-
-	/* open receive sockets before transmitting */
-	if (cfg_do_rx) {
-		fdp = recv_prepare_packet();
-		fdr = recv_prepare_udp();
-	}
-
-	if (cfg_do_tx)
-		do_tx();
-
-	if (cfg_do_rx)
-		do_rx(fdp, fdr);
-
-	fprintf(stderr, "OK\n");
-	return 0;
-}