[infra if] add platform infra if module

src/ncp/posix/CMakeLists.txt

@@ -27,6 +27,8 @@
 #
 
 add_library(otbr-posix
+    infra_if.hpp
+    infra_if.cpp
     netif.cpp
     netif_linux.cpp
     netif_unix.cpp

src/ncp/posix/infra_if.cpp

@@ -0,0 +1,158 @@
+/*
+ *  Copyright (c) 2024, The OpenThread Authors.
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are met:
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the copyright holder nor the
+ *     names of its contributors may be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#define OTBR_LOG_TAG "INFRAIF"
+
+#include "infra_if.hpp"
+
+#include <ifaddrs.h>
+#ifdef __linux__
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#endif
+#include <netinet/icmp6.h>
+#include <sys/ioctl.h>
+
+#include "utils/socket_utils.hpp"
+
+namespace otbr {
+
+otbrError InfraIf::Dependencies::SetInfraIf(uint32_t                       aInfraIfIndex,
+                                            bool                           aIsRunning,
+                                            const std::vector<Ip6Address> &aIp6Addresses)
+{
+    OTBR_UNUSED_VARIABLE(aInfraIfIndex);
+    OTBR_UNUSED_VARIABLE(aIsRunning);
+    OTBR_UNUSED_VARIABLE(aIp6Addresses);
+    return OTBR_ERROR_NONE;
+}
+
+InfraIf::InfraIf(Dependencies &aDependencies)
+    : mDeps(aDependencies)
+    , mInfraIfIndex(0)
+{
+}
+
+void InfraIf::Init(void)
+{
+}
+
+void InfraIf::Deinit(void)
+{
+    mInfraIfIndex = 0;
+}
+
+void InfraIf::SetInfraIf(const char *aIfName)
+{
+    std::vector<Ip6Address> addresses;
+
+    VerifyOrDie(aIfName != nullptr && strlen(aIfName) > 0, "Invalid infra interface name");
+    VerifyOrDie(strnlen(aIfName, sizeof(mInfraIfName)) < sizeof(mInfraIfName), "infra interface name is too long!");
+    strcpy(mInfraIfName, aIfName);
+
+    mInfraIfIndex = if_nametoindex(aIfName);
+    VerifyOrDie(mInfraIfIndex != 0, "Failed to get the index for infra interface");
+
+    GetAddresses(addresses);
+
+    SuccessOrDie(mDeps.SetInfraIf(mInfraIfIndex, IsRunning(addresses), addresses), "Failed to set infra-if!");
+}
+
+bool InfraIf::IsRunning(const std::vector<Ip6Address> &aAddrs) const
+{
+    return mInfraIfIndex ? ((GetFlags() & IFF_RUNNING) && HasLinkLocalAddress(aAddrs)) : false;
+}
+
+uint32_t InfraIf::GetFlags(void) const
+{
+    int          sock;
+    struct ifreq ifReq;
+    uint32_t     flags = 0;
+
+    sock = SocketWithCloseExec(AF_INET6, SOCK_DGRAM, IPPROTO_IP, kSocketBlock);
+    VerifyOrDie(sock != -1, otbrErrorString(OTBR_ERROR_ERRNO));
+
+    memset(&ifReq, 0, sizeof(ifReq));
+    static_assert(sizeof(ifReq.ifr_name) >= sizeof(mInfraIfName), "mInfraIfName is not of appropriate size.");
+    strcpy(ifReq.ifr_name, mInfraIfName);
+
+    if (ioctl(sock, SIOCGIFFLAGS, &ifReq) == -1)
+    {
+        otbrLogCrit("The infra link %s may be lost. Exiting.", mInfraIfName);
+        DieNow(otbrErrorString(OTBR_ERROR_ERRNO));
+    }
+    flags = static_cast<uint32_t>(ifReq.ifr_flags);
+
+    close(sock);
+    return flags;
+}
+
+void InfraIf::GetAddresses(std::vector<Ip6Address> &aAddrs)
+{
+    struct ifaddrs *ifAddrs = nullptr;
+
+    if (getifaddrs(&ifAddrs) < 0)
+    {
+        otbrLogCrit("failed to get netif addresses: %s", strerror(errno));
+        DieNow(otbrErrorString(OTBR_ERROR_ERRNO));
+    }
+
+    for (struct ifaddrs *addr = ifAddrs; addr != nullptr; addr = addr->ifa_next)
+    {
+        struct sockaddr_in6 *ip6Addr;
+
+        if (strncmp(addr->ifa_name, mInfraIfName, sizeof(mInfraIfName)) != 0 || addr->ifa_addr == nullptr ||
+            addr->ifa_addr->sa_family != AF_INET6)
+        {
+            continue;
+        }
+
+        ip6Addr = reinterpret_cast<sockaddr_in6 *>(addr->ifa_addr);
+        aAddrs.emplace_back(*reinterpret_cast<otIp6Address *>(&ip6Addr->sin6_addr));
+    }
+
+    freeifaddrs(ifAddrs);
+}
+
+bool InfraIf::HasLinkLocalAddress(const std::vector<Ip6Address> &aAddrs)
+{
+    bool hasLla = false;
+
+    for (const Ip6Address &otAddr : aAddrs)
+    {
+        if (IN6_IS_ADDR_LINKLOCAL(reinterpret_cast<const in6_addr *>(&otAddr)))
+        {
+            hasLla = true;
+            break;
+        }
+    }
+
+    return hasLla;
+}
+
+} // namespace otbr

src/ncp/posix/infra_if.hpp

@@ -0,0 +1,84 @@
+/*
+ *  Copyright (c) 2024, The OpenThread Authors.
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are met:
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the copyright holder nor the
+ *     names of its contributors may be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @file
+ *   This file includes definitions of the Infrastructure network interface of otbr-agent.
+ */
+
+#ifndef OTBR_AGENT_POSIX_INFRA_IF_HPP_
+#define OTBR_AGENT_POSIX_INFRA_IF_HPP_
+
+#include <net/if.h>
+
+#include <vector>
+
+#include <openthread/ip6.h>
+
+#include "common/types.hpp"
+
+namespace otbr {
+
+/**
+ * Host infrastructure network interface module.
+ *
+ * The infrastructure network interface MUST be explicitly set by `SetInfraIf` before the InfraIf module can work.
+ *
+ */
+class InfraIf
+{
+public:
+    class Dependencies
+    {
+    public:
+        virtual otbrError SetInfraIf(uint32_t                       aInfraIfIndex,
+                                     bool                           aIsRunning,
+                                     const std::vector<Ip6Address> &aIp6Addresses);
+    };
+
+    InfraIf(Dependencies &aDependencies);
+
+    void Init(void);
+    void Deinit(void);
+    void SetInfraIf(const char *aIfName);
+
+private:
+    bool        IsRunning(const std::vector<Ip6Address> &aAddrs) const;
+    uint32_t    GetFlags(void) const;
+    void        GetAddresses(std::vector<Ip6Address> &aAddrs);
+    static bool HasLinkLocalAddress(const std::vector<Ip6Address> &aAddrs);
+
+    Dependencies &mDeps;
+    char          mInfraIfName[IFNAMSIZ];
+    uint32_t      mInfraIfIndex;
+    int           mInfraIfIcmp6Socket = -1;
+};
+
+} // namespace otbr
+
+#endif // OTBR_AGENT_POSIX_INFRA_IF_HPP_

tests/gtest/CMakeLists.txt

@@ -75,6 +75,7 @@ if(OTBR_MDNS)
 endif()
 
 add_executable(otbr-posix-gtest-unit
+    test_infraif.cpp
     test_netif.cpp
 )
 target_link_libraries(otbr-posix-gtest-unit

tests/gtest/test_infraif.cpp

@@ -0,0 +1,88 @@
+/*
+ *    Copyright (c) 2024, The OpenThread Authors.
+ *    All rights reserved.
+ *
+ *    Redistribution and use in source and binary forms, with or without
+ *    modification, are permitted provided that the following conditions are met:
+ *    1. Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *    2. Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *    3. Neither the name of the copyright holder nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ *    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ *    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *    POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include "ncp/posix/infra_if.hpp"
+#include "ncp/posix/netif.hpp"
+
+// Only Test on linux platform for now.
+#ifdef __linux__
+
+class InfraIfDependencyTest : public otbr::InfraIf::Dependencies
+{
+public:
+    InfraIfDependencyTest(void)
+        : mInfraIfIndex(0)
+        , mIsRunning(false)
+    {
+    }
+
+    otbrError SetInfraIf(uint32_t                             aInfraIfIndex,
+                         bool                                 aIsRunning,
+                         const std::vector<otbr::Ip6Address> &aIp6Addresses) override
+    {
+        mInfraIfIndex = aInfraIfIndex;
+        mIsRunning    = aIsRunning;
+        mIp6Addresses = aIp6Addresses;
+        return OTBR_ERROR_NONE;
+    }
+
+    uint32_t                      mInfraIfIndex;
+    bool                          mIsRunning;
+    std::vector<otbr::Ip6Address> mIp6Addresses;
+};
+
+TEST(InfraIf, DepsSetInfraIfInvokedCorrectly_AfterSpecifyingInfraIf)
+{
+    const std::string fakeInfraIf = "wlx123";
+
+    ///< Utilize the Netif module to create a network interface as the fake infrastructure interface.
+    otbr::Netif::Dependencies defaultNetifDep;
+    otbr::Netif               netif(defaultNetifDep);
+    EXPECT_EQ(netif.Init(fakeInfraIf), OTBR_ERROR_NONE);
+
+    const otIp6Address kTestAddr = {
+        {0xfd, 0x35, 0x7a, 0x7d, 0x0f, 0x16, 0xe7, 0xe3, 0x73, 0xf3, 0x09, 0x00, 0x8e, 0xbe, 0x1b, 0x65}};
+    std::vector<otbr::Ip6AddressInfo> addrs = {
+        {kTestAddr, 64, 0, 1, 0},
+    };
+    netif.UpdateIp6UnicastAddresses(addrs);
+
+    InfraIfDependencyTest testInfraIfDep;
+    otbr::InfraIf         infraIf(testInfraIfDep);
+    infraIf.SetInfraIf(fakeInfraIf.c_str());
+
+    EXPECT_NE(testInfraIfDep.mInfraIfIndex, 0);
+    EXPECT_EQ(testInfraIfDep.mIsRunning, false);
+    EXPECT_EQ(testInfraIfDep.mIp6Addresses.size(), 1);
+    EXPECT_THAT(testInfraIfDep.mIp6Addresses, ::testing::Contains(otbr::Ip6Address(kTestAddr)));
+}
+
+#endif // __linux__