--- /dev/null
+From 51f1892b5289f0c09745d3bedb36493555d6d90c Mon Sep 17 00:00:00 2001
+From: Daniel Borkmann <daniel@iogearbox.net>
+Date: Tue, 24 Oct 2023 23:49:03 +0200
+Subject: selftests/bpf: Add netlink helper library
+
+From: Daniel Borkmann <daniel@iogearbox.net>
+
+commit 51f1892b5289f0c09745d3bedb36493555d6d90c upstream.
+
+Add a minimal netlink helper library for the BPF selftests. This has been
+taken and cut down and cleaned up from iproute2. This covers basics such
+as netdevice creation which we need for BPF selftests / BPF CI given
+iproute2 package cannot cover it yet.
+
+Stanislav Fomichev suggested that this could be replaced in future by ynl
+tool generated C code once it has RTNL support to create devices. Once we
+get to this point the BPF CI would also need to add libmnl. If no further
+extensions are needed, a second option could be that we remove this code
+again once iproute2 package has support.
+
+Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
+Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
+Link: https://lore.kernel.org/r/20231024214904.29825-7-daniel@iogearbox.net
+Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
+Signed-off-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ tools/testing/selftests/bpf/Makefile | 19 +
+ tools/testing/selftests/bpf/netlink_helpers.c | 358 ++++++++++++++++++++++++++
+ tools/testing/selftests/bpf/netlink_helpers.h | 46 +++
+ 3 files changed, 418 insertions(+), 5 deletions(-)
+ create mode 100644 tools/testing/selftests/bpf/netlink_helpers.c
+ create mode 100644 tools/testing/selftests/bpf/netlink_helpers.h
+
+--- a/tools/testing/selftests/bpf/Makefile
++++ b/tools/testing/selftests/bpf/Makefile
+@@ -590,11 +590,20 @@ endef
+ # Define test_progs test runner.
+ TRUNNER_TESTS_DIR := prog_tests
+ TRUNNER_BPF_PROGS_DIR := progs
+-TRUNNER_EXTRA_SOURCES := test_progs.c cgroup_helpers.c trace_helpers.c \
+- network_helpers.c testing_helpers.c \
+- btf_helpers.c flow_dissector_load.h \
+- cap_helpers.c test_loader.c xsk.c disasm.c \
+- json_writer.c unpriv_helpers.c \
++TRUNNER_EXTRA_SOURCES := test_progs.c \
++ cgroup_helpers.c \
++ trace_helpers.c \
++ network_helpers.c \
++ testing_helpers.c \
++ btf_helpers.c \
++ cap_helpers.c \
++ unpriv_helpers.c \
++ netlink_helpers.c \
++ test_loader.c \
++ xsk.c \
++ disasm.c \
++ json_writer.c \
++ flow_dissector_load.h \
+ ip_check_defrag_frags.h
+ TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read $(OUTPUT)/bpf_testmod.ko \
+ $(OUTPUT)/liburandom_read.so \
+--- /dev/null
++++ b/tools/testing/selftests/bpf/netlink_helpers.c
+@@ -0,0 +1,358 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/* Taken & modified from iproute2's libnetlink.c
++ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
++ */
++#include <stdio.h>
++#include <stdlib.h>
++#include <unistd.h>
++#include <errno.h>
++#include <time.h>
++#include <sys/socket.h>
++
++#include "netlink_helpers.h"
++
++static int rcvbuf = 1024 * 1024;
++
++void rtnl_close(struct rtnl_handle *rth)
++{
++ if (rth->fd >= 0) {
++ close(rth->fd);
++ rth->fd = -1;
++ }
++}
++
++int rtnl_open_byproto(struct rtnl_handle *rth, unsigned int subscriptions,
++ int protocol)
++{
++ socklen_t addr_len;
++ int sndbuf = 32768;
++ int one = 1;
++
++ memset(rth, 0, sizeof(*rth));
++ rth->proto = protocol;
++ rth->fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, protocol);
++ if (rth->fd < 0) {
++ perror("Cannot open netlink socket");
++ return -1;
++ }
++ if (setsockopt(rth->fd, SOL_SOCKET, SO_SNDBUF,
++ &sndbuf, sizeof(sndbuf)) < 0) {
++ perror("SO_SNDBUF");
++ goto err;
++ }
++ if (setsockopt(rth->fd, SOL_SOCKET, SO_RCVBUF,
++ &rcvbuf, sizeof(rcvbuf)) < 0) {
++ perror("SO_RCVBUF");
++ goto err;
++ }
++
++ /* Older kernels may no support extended ACK reporting */
++ setsockopt(rth->fd, SOL_NETLINK, NETLINK_EXT_ACK,
++ &one, sizeof(one));
++
++ memset(&rth->local, 0, sizeof(rth->local));
++ rth->local.nl_family = AF_NETLINK;
++ rth->local.nl_groups = subscriptions;
++
++ if (bind(rth->fd, (struct sockaddr *)&rth->local,
++ sizeof(rth->local)) < 0) {
++ perror("Cannot bind netlink socket");
++ goto err;
++ }
++ addr_len = sizeof(rth->local);
++ if (getsockname(rth->fd, (struct sockaddr *)&rth->local,
++ &addr_len) < 0) {
++ perror("Cannot getsockname");
++ goto err;
++ }
++ if (addr_len != sizeof(rth->local)) {
++ fprintf(stderr, "Wrong address length %d\n", addr_len);
++ goto err;
++ }
++ if (rth->local.nl_family != AF_NETLINK) {
++ fprintf(stderr, "Wrong address family %d\n",
++ rth->local.nl_family);
++ goto err;
++ }
++ rth->seq = time(NULL);
++ return 0;
++err:
++ rtnl_close(rth);
++ return -1;
++}
++
++int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
++{
++ return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE);
++}
++
++static int __rtnl_recvmsg(int fd, struct msghdr *msg, int flags)
++{
++ int len;
++
++ do {
++ len = recvmsg(fd, msg, flags);
++ } while (len < 0 && (errno == EINTR || errno == EAGAIN));
++ if (len < 0) {
++ fprintf(stderr, "netlink receive error %s (%d)\n",
++ strerror(errno), errno);
++ return -errno;
++ }
++ if (len == 0) {
++ fprintf(stderr, "EOF on netlink\n");
++ return -ENODATA;
++ }
++ return len;
++}
++
++static int rtnl_recvmsg(int fd, struct msghdr *msg, char **answer)
++{
++ struct iovec *iov = msg->msg_iov;
++ char *buf;
++ int len;
++
++ iov->iov_base = NULL;
++ iov->iov_len = 0;
++
++ len = __rtnl_recvmsg(fd, msg, MSG_PEEK | MSG_TRUNC);
++ if (len < 0)
++ return len;
++ if (len < 32768)
++ len = 32768;
++ buf = malloc(len);
++ if (!buf) {
++ fprintf(stderr, "malloc error: not enough buffer\n");
++ return -ENOMEM;
++ }
++ iov->iov_base = buf;
++ iov->iov_len = len;
++ len = __rtnl_recvmsg(fd, msg, 0);
++ if (len < 0) {
++ free(buf);
++ return len;
++ }
++ if (answer)
++ *answer = buf;
++ else
++ free(buf);
++ return len;
++}
++
++static void rtnl_talk_error(struct nlmsghdr *h, struct nlmsgerr *err,
++ nl_ext_ack_fn_t errfn)
++{
++ fprintf(stderr, "RTNETLINK answers: %s\n",
++ strerror(-err->error));
++}
++
++static int __rtnl_talk_iov(struct rtnl_handle *rtnl, struct iovec *iov,
++ size_t iovlen, struct nlmsghdr **answer,
++ bool show_rtnl_err, nl_ext_ack_fn_t errfn)
++{
++ struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
++ struct iovec riov;
++ struct msghdr msg = {
++ .msg_name = &nladdr,
++ .msg_namelen = sizeof(nladdr),
++ .msg_iov = iov,
++ .msg_iovlen = iovlen,
++ };
++ unsigned int seq = 0;
++ struct nlmsghdr *h;
++ int i, status;
++ char *buf;
++
++ for (i = 0; i < iovlen; i++) {
++ h = iov[i].iov_base;
++ h->nlmsg_seq = seq = ++rtnl->seq;
++ if (answer == NULL)
++ h->nlmsg_flags |= NLM_F_ACK;
++ }
++ status = sendmsg(rtnl->fd, &msg, 0);
++ if (status < 0) {
++ perror("Cannot talk to rtnetlink");
++ return -1;
++ }
++ /* change msg to use the response iov */
++ msg.msg_iov = &riov;
++ msg.msg_iovlen = 1;
++ i = 0;
++ while (1) {
++next:
++ status = rtnl_recvmsg(rtnl->fd, &msg, &buf);
++ ++i;
++ if (status < 0)
++ return status;
++ if (msg.msg_namelen != sizeof(nladdr)) {
++ fprintf(stderr,
++ "Sender address length == %d!\n",
++ msg.msg_namelen);
++ exit(1);
++ }
++ for (h = (struct nlmsghdr *)buf; status >= sizeof(*h); ) {
++ int len = h->nlmsg_len;
++ int l = len - sizeof(*h);
++
++ if (l < 0 || len > status) {
++ if (msg.msg_flags & MSG_TRUNC) {
++ fprintf(stderr, "Truncated message!\n");
++ free(buf);
++ return -1;
++ }
++ fprintf(stderr,
++ "Malformed message: len=%d!\n",
++ len);
++ exit(1);
++ }
++ if (nladdr.nl_pid != 0 ||
++ h->nlmsg_pid != rtnl->local.nl_pid ||
++ h->nlmsg_seq > seq || h->nlmsg_seq < seq - iovlen) {
++ /* Don't forget to skip that message. */
++ status -= NLMSG_ALIGN(len);
++ h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len));
++ continue;
++ }
++ if (h->nlmsg_type == NLMSG_ERROR) {
++ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h);
++ int error = err->error;
++
++ if (l < sizeof(struct nlmsgerr)) {
++ fprintf(stderr, "ERROR truncated\n");
++ free(buf);
++ return -1;
++ }
++ if (error) {
++ errno = -error;
++ if (rtnl->proto != NETLINK_SOCK_DIAG &&
++ show_rtnl_err)
++ rtnl_talk_error(h, err, errfn);
++ }
++ if (i < iovlen) {
++ free(buf);
++ goto next;
++ }
++ if (error) {
++ free(buf);
++ return -i;
++ }
++ if (answer)
++ *answer = (struct nlmsghdr *)buf;
++ else
++ free(buf);
++ return 0;
++ }
++ if (answer) {
++ *answer = (struct nlmsghdr *)buf;
++ return 0;
++ }
++ fprintf(stderr, "Unexpected reply!\n");
++ status -= NLMSG_ALIGN(len);
++ h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len));
++ }
++ free(buf);
++ if (msg.msg_flags & MSG_TRUNC) {
++ fprintf(stderr, "Message truncated!\n");
++ continue;
++ }
++ if (status) {
++ fprintf(stderr, "Remnant of size %d!\n", status);
++ exit(1);
++ }
++ }
++}
++
++static int __rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
++ struct nlmsghdr **answer, bool show_rtnl_err,
++ nl_ext_ack_fn_t errfn)
++{
++ struct iovec iov = {
++ .iov_base = n,
++ .iov_len = n->nlmsg_len,
++ };
++
++ return __rtnl_talk_iov(rtnl, &iov, 1, answer, show_rtnl_err, errfn);
++}
++
++int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
++ struct nlmsghdr **answer)
++{
++ return __rtnl_talk(rtnl, n, answer, true, NULL);
++}
++
++int addattr(struct nlmsghdr *n, int maxlen, int type)
++{
++ return addattr_l(n, maxlen, type, NULL, 0);
++}
++
++int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data)
++{
++ return addattr_l(n, maxlen, type, &data, sizeof(__u8));
++}
++
++int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data)
++{
++ return addattr_l(n, maxlen, type, &data, sizeof(__u16));
++}
++
++int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data)
++{
++ return addattr_l(n, maxlen, type, &data, sizeof(__u32));
++}
++
++int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data)
++{
++ return addattr_l(n, maxlen, type, &data, sizeof(__u64));
++}
++
++int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *str)
++{
++ return addattr_l(n, maxlen, type, str, strlen(str)+1);
++}
++
++int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data,
++ int alen)
++{
++ int len = RTA_LENGTH(alen);
++ struct rtattr *rta;
++
++ if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) {
++ fprintf(stderr, "%s: Message exceeded bound of %d\n",
++ __func__, maxlen);
++ return -1;
++ }
++ rta = NLMSG_TAIL(n);
++ rta->rta_type = type;
++ rta->rta_len = len;
++ if (alen)
++ memcpy(RTA_DATA(rta), data, alen);
++ n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
++ return 0;
++}
++
++int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len)
++{
++ if (NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len) > maxlen) {
++ fprintf(stderr, "%s: Message exceeded bound of %d\n",
++ __func__, maxlen);
++ return -1;
++ }
++
++ memcpy(NLMSG_TAIL(n), data, len);
++ memset((void *) NLMSG_TAIL(n) + len, 0, NLMSG_ALIGN(len) - len);
++ n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len);
++ return 0;
++}
++
++struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type)
++{
++ struct rtattr *nest = NLMSG_TAIL(n);
++
++ addattr_l(n, maxlen, type, NULL, 0);
++ return nest;
++}
++
++int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest)
++{
++ nest->rta_len = (void *)NLMSG_TAIL(n) - (void *)nest;
++ return n->nlmsg_len;
++}
+--- /dev/null
++++ b/tools/testing/selftests/bpf/netlink_helpers.h
+@@ -0,0 +1,46 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++#ifndef NETLINK_HELPERS_H
++#define NETLINK_HELPERS_H
++
++#include <string.h>
++#include <linux/netlink.h>
++#include <linux/rtnetlink.h>
++
++struct rtnl_handle {
++ int fd;
++ struct sockaddr_nl local;
++ struct sockaddr_nl peer;
++ __u32 seq;
++ __u32 dump;
++ int proto;
++ FILE *dump_fp;
++#define RTNL_HANDLE_F_LISTEN_ALL_NSID 0x01
++#define RTNL_HANDLE_F_SUPPRESS_NLERR 0x02
++#define RTNL_HANDLE_F_STRICT_CHK 0x04
++ int flags;
++};
++
++#define NLMSG_TAIL(nmsg) \
++ ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
++
++typedef int (*nl_ext_ack_fn_t)(const char *errmsg, uint32_t off,
++ const struct nlmsghdr *inner_nlh);
++
++int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
++ __attribute__((warn_unused_result));
++void rtnl_close(struct rtnl_handle *rth);
++int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
++ struct nlmsghdr **answer)
++ __attribute__((warn_unused_result));
++
++int addattr(struct nlmsghdr *n, int maxlen, int type);
++int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
++int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
++int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
++int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
++int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
++int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
++int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
++struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
++int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
++#endif /* NETLINK_HELPERS_H */
projects / thirdparty / kernel / stable-queue.git / commitdiff
