/*
 * Test functionality of BPF filters with SO_REUSEPORT. Same test as
 * in reuseport_bpf_cpu, only as one socket per NUMA node.
 */

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <errno.h>
#include <error.h>
#include <linux/filter.h>
#include <linux/bpf.h>
#include <linux/in.h>
#include <linux/unistd.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <numa.h>

static const int PORT = 8888;

static void build_rcv_group(int *rcv_fd, size_t len, int family, int proto)
{
	struct sockaddr_storage addr;
	struct sockaddr_in  *addr4;
	struct sockaddr_in6 *addr6;
	size_t i;
	int opt;

	switch (family) {
	case AF_INET:
		addr4 = (struct sockaddr_in *)&addr;
		addr4->sin_family = AF_INET;
		addr4->sin_addr.s_addr = htonl(INADDR_ANY);
		addr4->sin_port = htons(PORT);
		break;
	case AF_INET6:
		addr6 = (struct sockaddr_in6 *)&addr;
		addr6->sin6_family = AF_INET6;
		addr6->sin6_addr = in6addr_any;
		addr6->sin6_port = htons(PORT);
		break;
	default:
		error(1, 0, "Unsupported family %d", family);
	}

	for (i = 0; i < len; ++i) {
		rcv_fd[i] = socket(family, proto, 0);
		if (rcv_fd[i] < 0)
			error(1, errno, "failed to create receive socket");

		opt = 1;
		if (setsockopt(rcv_fd[i], SOL_SOCKET, SO_REUSEPORT, &opt,
			       sizeof(opt)))
			error(1, errno, "failed to set SO_REUSEPORT");

		if (bind(rcv_fd[i], (struct sockaddr *)&addr, sizeof(addr)))
			error(1, errno, "failed to bind receive socket");

		if (proto == SOCK_STREAM && listen(rcv_fd[i], len * 10))
			error(1, errno, "failed to listen on receive port");
	}
}

static void attach_bpf(int fd)
{
	static char bpf_log_buf[65536];
	static const char bpf_license[] = "";

	int bpf_fd;
	const struct bpf_insn prog[] = {
		/* R0 = bpf_get_numa_node_id() */
		{ BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_numa_node_id },
		/* return R0 */
		{ BPF_JMP | BPF_EXIT, 0, 0, 0, 0 }
	};
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
	attr.insn_cnt = sizeof(prog) / sizeof(prog[0]);
	attr.insns = (unsigned long) &prog;
	attr.license = (unsigned long) &bpf_license;
	attr.log_buf = (unsigned long) &bpf_log_buf;
	attr.log_size = sizeof(bpf_log_buf);
	attr.log_level = 1;

	bpf_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
	if (bpf_fd < 0)
		error(1, errno, "ebpf error. log:\n%s\n", bpf_log_buf);

	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &bpf_fd,
			sizeof(bpf_fd)))
		error(1, errno, "failed to set SO_ATTACH_REUSEPORT_EBPF");

	close(bpf_fd);
}

static void send_from_node(int node_id, int family, int proto)
{
	struct sockaddr_storage saddr, daddr;
	struct sockaddr_in  *saddr4, *daddr4;
	struct sockaddr_in6 *saddr6, *daddr6;
	int fd;

	switch (family) {
	case AF_INET:
		saddr4 = (struct sockaddr_in *)&saddr;
		saddr4->sin_family = AF_INET;
		saddr4->sin_addr.s_addr = htonl(INADDR_ANY);
		saddr4->sin_port = 0;

		daddr4 = (struct sockaddr_in *)&daddr;
		daddr4->sin_family = AF_INET;
		daddr4->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
		daddr4->sin_port = htons(PORT);
		break;
	case AF_INET6:
		saddr6 = (struct sockaddr_in6 *)&saddr;
		saddr6->sin6_family = AF_INET6;
		saddr6->sin6_addr = in6addr_any;
		saddr6->sin6_port = 0;

		daddr6 = (struct sockaddr_in6 *)&daddr;
		daddr6->sin6_family = AF_INET6;
		daddr6->sin6_addr = in6addr_loopback;
		daddr6->sin6_port = htons(PORT);
		break;
	default:
		error(1, 0, "Unsupported family %d", family);
	}

	if (numa_run_on_node(node_id) < 0)
		error(1, errno, "failed to pin to node");

	fd = socket(family, proto, 0);
	if (fd < 0)
		error(1, errno, "failed to create send socket");

	if (bind(fd, (struct sockaddr *)&saddr, sizeof(saddr)))
		error(1, errno, "failed to bind send socket");

	if (connect(fd, (struct sockaddr *)&daddr, sizeof(daddr)))
		error(1, errno, "failed to connect send socket");

	if (send(fd, "a", 1, 0) < 0)
		error(1, errno, "failed to send message");

	close(fd);
}

static
void receive_on_node(int *rcv_fd, int len, int epfd, int node_id, int proto)
{
	struct epoll_event ev;
	int i, fd;
	char buf[8];

	i = epoll_wait(epfd, &ev, 1, -1);
	if (i < 0)
		error(1, errno, "epoll_wait failed");

	if (proto == SOCK_STREAM) {
		fd = accept(ev.data.fd, NULL, NULL);
		if (fd < 0)
			error(1, errno, "failed to accept");
		i = recv(fd, buf, sizeof(buf), 0);
		close(fd);
	} else {
		i = recv(ev.data.fd, buf, sizeof(buf), 0);
	}

	if (i < 0)
		error(1, errno, "failed to recv");

	for (i = 0; i < len; ++i)
		if (ev.data.fd == rcv_fd[i])
			break;
	if (i == len)
		error(1, 0, "failed to find socket");
	fprintf(stderr, "send node %d, receive socket %d\n", node_id, i);
	if (node_id != i)
		error(1, 0, "node id/receive socket mismatch");
}

static void test(int *rcv_fd, int len, int family, int proto)
{
	struct epoll_event ev;
	int epfd, node;

	build_rcv_group(rcv_fd, len, family, proto);
	attach_bpf(rcv_fd[0]);

	epfd = epoll_create(1);
	if (epfd < 0)
		error(1, errno, "failed to create epoll");
	for (node = 0; node < len; ++node) {
		ev.events = EPOLLIN;
		ev.data.fd = rcv_fd[node];
		if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fd[node], &ev))
			error(1, errno, "failed to register sock epoll");
	}

	/* Forward iterate */
	for (node = 0; node < len; ++node) {
		send_from_node(node, family, proto);
		receive_on_node(rcv_fd, len, epfd, node, proto);
	}

	/* Reverse iterate */
	for (node = len - 1; node >= 0; --node) {
		send_from_node(node, family, proto);
		receive_on_node(rcv_fd, len, epfd, node, proto);
	}

	close(epfd);
	for (node = 0; node < len; ++node)
		close(rcv_fd[node]);
}

int main(void)
{
	int *rcv_fd, nodes;

	if (numa_available() < 0)
		error(1, errno, "no numa api support");

	nodes = numa_max_node() + 1;

	rcv_fd = calloc(nodes, sizeof(int));
	if (!rcv_fd)
		error(1, 0, "failed to allocate array");

	fprintf(stderr, "---- IPv4 UDP ----\n");
	test(rcv_fd, nodes, AF_INET, SOCK_DGRAM);

	fprintf(stderr, "---- IPv6 UDP ----\n");
	test(rcv_fd, nodes, AF_INET6, SOCK_DGRAM);

	fprintf(stderr, "---- IPv4 TCP ----\n");
	test(rcv_fd, nodes, AF_INET, SOCK_STREAM);

	fprintf(stderr, "---- IPv6 TCP ----\n");
	test(rcv_fd, nodes, AF_INET6, SOCK_STREAM);

	free(rcv_fd);

	fprintf(stderr, "SUCCESS\n");
	return 0;
}
 on radix with autonuma</div><div class='commit-msg'>When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it
clears all the protection bits but leave the PTE valid.

With the Radix MMU, an attempt at executing from such a PTE will
take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G".

It is thus incorrect to treat all such faults as errors. We should
pass them to handle_mm_fault() for autonuma to deal with. The case
of pages that are really not executable is handled by the existing
test for VM_EXEC further down.

That leaves us with catching the kernel attempts at executing user
pages. We can catch that earlier, even before we do find_vma.

It is never valid on powerpc for the kernel to take an exec fault
to begin with. So fold that test with the existing test for the
kernel faulting on kernel addresses to bail out early.

Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report")
Signed-off-by: Benjamin Herrenschmidt &lt;benh@kernel.crashing.org&gt;
Reviewed-by: Aneesh Kumar K.V &lt;aneesh.kumar@linux.vnet.ibm.com&gt;
Acked-by: Balbir Singh &lt;bsingharora@gmail.com&gt;
Signed-off-by: Michael Ellerman &lt;mpe@ellerman.id.au&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>Diffstat</a> (limited to 'fs/afs/mntpt.c')</div><table summary='diffstat' class='diffstat'>