--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright 2026 Google LLC */
+
+#include <linux/if.h>
+#include <linux/mroute.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/socket.h>
+#include <sched.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+
+#include "kselftest_harness.h"
+
+FIXTURE(ipmr)
+{
+ int netlink_sk;
+ int raw_sk;
+ int veth_ifindex;
+};
+
+FIXTURE_VARIANT(ipmr)
+{
+ int family;
+ int protocol;
+ int level;
+ int opts[MRT_MAX - MRT_BASE + 1];
+};
+
+FIXTURE_VARIANT_ADD(ipmr, ipv4)
+{
+ .family = AF_INET,
+ .protocol = IPPROTO_IGMP,
+ .level = IPPROTO_IP,
+ .opts = {
+ MRT_INIT,
+ MRT_DONE,
+ MRT_ADD_VIF,
+ MRT_DEL_VIF,
+ MRT_ADD_MFC,
+ MRT_DEL_MFC,
+ MRT_VERSION,
+ MRT_ASSERT,
+ MRT_PIM,
+ MRT_TABLE,
+ MRT_ADD_MFC_PROXY,
+ MRT_DEL_MFC_PROXY,
+ MRT_FLUSH,
+ },
+};
+
+struct mfc_attr {
+ int table;
+ __u32 origin;
+ __u32 group;
+ int ifindex;
+ bool proxy;
+};
+
+static struct rtattr *nl_add_rtattr(struct nlmsghdr *nlmsg, struct rtattr *rta,
+ int type, const void *data, int len)
+{
+ int unused = 0;
+
+ rta->rta_type = type;
+ rta->rta_len = RTA_LENGTH(len);
+ memcpy(RTA_DATA(rta), data, len);
+
+ nlmsg->nlmsg_len += NLMSG_ALIGN(rta->rta_len);
+
+ return RTA_NEXT(rta, unused);
+}
+
+static int nl_sendmsg_mfc(struct __test_metadata *_metadata, FIXTURE_DATA(ipmr) *self,
+ __u16 nlmsg_type, struct mfc_attr *mfc_attr)
+{
+ struct {
+ struct nlmsghdr nlmsg;
+ struct rtmsg rtm;
+ char buf[4096];
+ } req = {
+ .nlmsg = {
+ .nlmsg_len = NLMSG_LENGTH(sizeof(req.rtm)),
+ /* ipmr does not care about NLM_F_CREATE and NLM_F_EXCL ... */
+ .nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
+ .nlmsg_type = nlmsg_type,
+ },
+ .rtm = {
+ /* hard requirements in rtm_to_ipmr_mfcc() */
+ .rtm_family = RTNL_FAMILY_IPMR,
+ .rtm_dst_len = 32,
+ .rtm_type = RTN_MULTICAST,
+ .rtm_scope = RT_SCOPE_UNIVERSE,
+ .rtm_protocol = RTPROT_MROUTED,
+ },
+ };
+ struct nlmsghdr *nlmsg = &req.nlmsg;
+ struct nlmsgerr *errmsg;
+ struct rtattr *rta;
+ int err;
+
+ rta = (struct rtattr *)&req.buf;
+ rta = nl_add_rtattr(nlmsg, rta, RTA_TABLE, &mfc_attr->table, sizeof(mfc_attr->table));
+ rta = nl_add_rtattr(nlmsg, rta, RTA_SRC, &mfc_attr->origin, sizeof(mfc_attr->origin));
+ rta = nl_add_rtattr(nlmsg, rta, RTA_DST, &mfc_attr->group, sizeof(mfc_attr->group));
+ if (mfc_attr->ifindex)
+ rta = nl_add_rtattr(nlmsg, rta, RTA_IIF, &mfc_attr->ifindex, sizeof(mfc_attr->ifindex));
+ if (mfc_attr->proxy)
+ rta = nl_add_rtattr(nlmsg, rta, RTA_PREFSRC, NULL, 0);
+
+ err = send(self->netlink_sk, &req, req.nlmsg.nlmsg_len, 0);
+ ASSERT_EQ(err, req.nlmsg.nlmsg_len);
+
+ memset(&req, 0, sizeof(req));
+
+ err = recv(self->netlink_sk, &req, sizeof(req), 0);
+ ASSERT_TRUE(NLMSG_OK(nlmsg, err));
+ ASSERT_EQ(NLMSG_ERROR, nlmsg->nlmsg_type);
+
+ errmsg = (struct nlmsgerr *)NLMSG_DATA(nlmsg);
+ return errmsg->error;
+}
+
+FIXTURE_SETUP(ipmr)
+{
+ struct ifreq ifr = {
+ .ifr_name = "veth0",
+ };
+ int err;
+
+ err = unshare(CLONE_NEWNET);
+ ASSERT_EQ(0, err);
+
+ self->netlink_sk = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ ASSERT_LE(0, self->netlink_sk);
+
+ self->raw_sk = socket(variant->family, SOCK_RAW, variant->protocol);
+ ASSERT_LT(0, self->raw_sk);
+
+ err = system("ip link add veth0 type veth peer veth1");
+ ASSERT_EQ(0, err);
+
+ err = ioctl(self->raw_sk, SIOCGIFINDEX, &ifr);
+ ASSERT_EQ(0, err);
+
+ self->veth_ifindex = ifr.ifr_ifindex;
+}
+
+FIXTURE_TEARDOWN(ipmr)
+{
+ close(self->raw_sk);
+ close(self->netlink_sk);
+}
+
+TEST_F(ipmr, mrt_init)
+{
+ int err, val = 0; /* any value is ok, but size must be int for MRT_INIT. */
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_INIT - MRT_BASE],
+ &val, sizeof(val));
+ ASSERT_EQ(0, err);
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_DONE - MRT_BASE],
+ &val, sizeof(val));
+ ASSERT_EQ(0, err);
+}
+
+TEST_F(ipmr, mrt_add_vif_register)
+{
+ struct vifctl vif = {
+ .vifc_vifi = 0,
+ .vifc_flags = VIFF_REGISTER,
+ };
+ int err;
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_ADD_VIF - MRT_BASE],
+ &vif, sizeof(vif));
+ ASSERT_EQ(0, err);
+
+ err = system("cat /proc/net/ip_mr_vif | grep -q pimreg");
+ ASSERT_EQ(0, err);
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_DEL_VIF - MRT_BASE],
+ &vif, sizeof(vif));
+ ASSERT_EQ(0, err);
+}
+
+TEST_F(ipmr, mrt_del_vif_unreg)
+{
+ struct vifctl vif = {
+ .vifc_vifi = 0,
+ .vifc_flags = VIFF_USE_IFINDEX,
+ .vifc_lcl_ifindex = self->veth_ifindex,
+ };
+ int err;
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_ADD_VIF - MRT_BASE],
+ &vif, sizeof(vif));
+ ASSERT_EQ(0, err);
+
+ err = system("cat /proc/net/ip_mr_vif | grep -q veth0");
+ ASSERT_EQ(0, err);
+
+ /* VIF is removed along with its device. */
+ err = system("ip link del veth0");
+ ASSERT_EQ(0, err);
+
+ /* mrt->vif_table[veth_ifindex]->dev is NULL. */
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_DEL_VIF - MRT_BASE],
+ &vif, sizeof(vif));
+ ASSERT_EQ(-1, err);
+ ASSERT_EQ(EADDRNOTAVAIL, errno);
+}
+
+TEST_F(ipmr, mrt_del_vif_netns_dismantle)
+{
+ struct vifctl vif = {
+ .vifc_vifi = 0,
+ .vifc_flags = VIFF_USE_IFINDEX,
+ .vifc_lcl_ifindex = self->veth_ifindex,
+ };
+ int err;
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_ADD_VIF - MRT_BASE],
+ &vif, sizeof(vif));
+ ASSERT_EQ(0, err);
+
+ /* Let cleanup_net() remove veth0 and VIF. */
+}
+
+TEST_F(ipmr, mrt_add_mfc)
+{
+ struct mfcctl mfc = {};
+ int err;
+
+ /* MRT_ADD_MFC / MRT_ADD_MFC_PROXY does not need vif to exist (unlike netlink). */
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_ADD_MFC - MRT_BASE],
+ &mfc, sizeof(mfc));
+ ASSERT_EQ(0, err);
+
+ /* (0.0.0.0 -> 0.0.0.0) */
+ err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");
+ ASSERT_EQ(0, err);
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_DEL_MFC - MRT_BASE],
+ &mfc, sizeof(mfc));
+}
+
+TEST_F(ipmr, mrt_add_mfc_proxy)
+{
+ struct mfcctl mfc = {};
+ int err;
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_ADD_MFC_PROXY - MRT_BASE],
+ &mfc, sizeof(mfc));
+ ASSERT_EQ(0, err);
+
+ err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");
+ ASSERT_EQ(0, err);
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_DEL_MFC_PROXY - MRT_BASE],
+ &mfc, sizeof(mfc));
+}
+
+TEST_F(ipmr, mrt_add_mfc_netlink)
+{
+ struct vifctl vif = {
+ .vifc_vifi = 0,
+ .vifc_flags = VIFF_USE_IFINDEX,
+ .vifc_lcl_ifindex = self->veth_ifindex,
+ };
+ struct mfc_attr mfc_attr = {
+ .table = RT_TABLE_DEFAULT,
+ .origin = 0,
+ .group = 0,
+ .ifindex = self->veth_ifindex,
+ .proxy = false,
+ };
+ int err;
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_ADD_VIF - MRT_BASE],
+ &vif, sizeof(vif));
+ ASSERT_EQ(0, err);
+
+ err = nl_sendmsg_mfc(_metadata, self, RTM_NEWROUTE, &mfc_attr);
+ ASSERT_EQ(0, err);
+
+ err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");
+ ASSERT_EQ(0, err);
+
+ err = nl_sendmsg_mfc(_metadata, self, RTM_DELROUTE, &mfc_attr);
+ ASSERT_EQ(0, err);
+}
+
+TEST_F(ipmr, mrt_add_mfc_netlink_proxy)
+{
+ struct vifctl vif = {
+ .vifc_vifi = 0,
+ .vifc_flags = VIFF_USE_IFINDEX,
+ .vifc_lcl_ifindex = self->veth_ifindex,
+ };
+ struct mfc_attr mfc_attr = {
+ .table = RT_TABLE_DEFAULT,
+ .origin = 0,
+ .group = 0,
+ .ifindex = self->veth_ifindex,
+ .proxy = true,
+ };
+ int err;
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_ADD_VIF - MRT_BASE],
+ &vif, sizeof(vif));
+ ASSERT_EQ(0, err);
+
+ err = nl_sendmsg_mfc(_metadata, self, RTM_NEWROUTE, &mfc_attr);
+ ASSERT_EQ(0, err);
+
+ err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");
+ ASSERT_EQ(0, err);
+
+ err = nl_sendmsg_mfc(_metadata, self, RTM_DELROUTE, &mfc_attr);
+ ASSERT_EQ(0, err);
+}
+
+TEST_F(ipmr, mrt_add_mfc_netlink_no_vif)
+{
+ struct mfc_attr mfc_attr = {
+ .table = RT_TABLE_DEFAULT,
+ .origin = 0,
+ .group = 0,
+ .proxy = false,
+ };
+ int err;
+
+ /* netlink always requires RTA_IIF of an existing vif. */
+ mfc_attr.ifindex = 0;
+ err = nl_sendmsg_mfc(_metadata, self, RTM_NEWROUTE, &mfc_attr);
+ ASSERT_EQ(-ENFILE, err);
+
+ /* netlink always requires RTA_IIF of an existing vif. */
+ mfc_attr.ifindex = self->veth_ifindex;
+ err = nl_sendmsg_mfc(_metadata, self, RTM_NEWROUTE, &mfc_attr);
+ ASSERT_EQ(-ENFILE, err);
+}
+
+TEST_F(ipmr, mrt_del_mfc_netlink_netns_dismantle)
+{
+ struct vifctl vifs[2] = {
+ {
+ .vifc_vifi = 0,
+ .vifc_flags = VIFF_USE_IFINDEX,
+ .vifc_lcl_ifindex = self->veth_ifindex,
+ },
+ {
+ .vifc_vifi = 1,
+ .vifc_flags = VIFF_REGISTER,
+ }
+ };
+ struct mfc_attr mfc_attr = {
+ .table = RT_TABLE_DEFAULT,
+ .origin = 0,
+ .group = 0,
+ .ifindex = self->veth_ifindex,
+ .proxy = false,
+ };
+ int i, err;
+
+ for (i = 0; i < 2; i++) {
+ /* Create 2 VIFs just to avoid -ENFILE later. */
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_ADD_VIF - MRT_BASE],
+ &vifs[i], sizeof(vifs[i]));
+ ASSERT_EQ(0, err);
+ }
+
+ /* Create a MFC for mrt->vif_table[0]. */
+ err = nl_sendmsg_mfc(_metadata, self, RTM_NEWROUTE, &mfc_attr);
+ ASSERT_EQ(0, err);
+
+ err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");
+ ASSERT_EQ(0, err);
+
+ /* Remove mrt->vif_table[0]. */
+ err = system("ip link del veth0");
+ ASSERT_EQ(0, err);
+
+ /* MFC entry is NOT removed even if the tied VIF is removed... */
+ err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");
+ ASSERT_EQ(0, err);
+
+ /* ... and netlink is not capable of removing such an entry
+ * because netlink always requires a valid RTA_IIF ... :/
+ */
+ err = nl_sendmsg_mfc(_metadata, self, RTM_DELROUTE, &mfc_attr);
+ ASSERT_EQ(-ENODEV, err);
+
+ /* It can be removed by setsockopt(), but let cleanup_net() remove this time. */
+}
+
+TEST_F(ipmr, mrt_table_flush)
+{
+ struct vifctl vif = {
+ .vifc_vifi = 0,
+ .vifc_flags = VIFF_USE_IFINDEX,
+ .vifc_lcl_ifindex = self->veth_ifindex,
+ };
+ struct mfc_attr mfc_attr = {
+ .origin = 0,
+ .group = 0,
+ .ifindex = self->veth_ifindex,
+ .proxy = false,
+ };
+ int table_id = 92;
+ int err, flags;
+
+ /* Set a random table id rather than RT_TABLE_DEFAULT.
+ * Note that /proc/net/ip_mr_{vif,cache} only supports RT_TABLE_DEFAULT.
+ */
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_TABLE - MRT_BASE],
+ &table_id, sizeof(table_id));
+ ASSERT_EQ(0, err);
+
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_ADD_VIF - MRT_BASE],
+ &vif, sizeof(vif));
+ ASSERT_EQ(0, err);
+
+ mfc_attr.table = table_id;
+ err = nl_sendmsg_mfc(_metadata, self, RTM_NEWROUTE, &mfc_attr);
+ ASSERT_EQ(0, err);
+
+ /* Flush mrt->vif_table[] and all caches. */
+ flags = MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC |
+ MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC;
+ err = setsockopt(self->raw_sk,
+ variant->level, variant->opts[MRT_FLUSH - MRT_BASE],
+ &flags, sizeof(flags));
+ ASSERT_EQ(0, err);
+}
+
+TEST_HARNESS_MAIN
projects / thirdparty / kernel / linux.git / commitdiff
