William A. Kennington III | a7344c3 | 2022-10-31 14:12:27 -0700 | [diff] [blame] | 1 | #include "rtnetlink.hpp" |
| 2 | |
| 3 | #include "netlink.hpp" |
William A. Kennington III | 6a92363 | 2022-11-06 18:17:33 -0800 | [diff] [blame] | 4 | #include "util.hpp" |
William A. Kennington III | a7344c3 | 2022-10-31 14:12:27 -0700 | [diff] [blame] | 5 | |
| 6 | #include <linux/rtnetlink.h> |
| 7 | |
| 8 | namespace phosphor::network::netlink |
| 9 | { |
| 10 | |
| 11 | template <typename Addr> |
| 12 | static std::optional<std::tuple<unsigned, InAddrAny>> |
| 13 | parse(std::string_view msg) |
| 14 | { |
| 15 | std::optional<unsigned> ifIdx; |
| 16 | std::optional<InAddrAny> gw; |
| 17 | while (!msg.empty()) |
| 18 | { |
| 19 | auto [hdr, data] = extractRtAttr(msg); |
| 20 | switch (hdr.rta_type) |
| 21 | { |
| 22 | case RTA_OIF: |
William A. Kennington III | 6a92363 | 2022-11-06 18:17:33 -0800 | [diff] [blame] | 23 | ifIdx.emplace(stdplus::raw::copyFromStrict<int>(data)); |
William A. Kennington III | a7344c3 | 2022-10-31 14:12:27 -0700 | [diff] [blame] | 24 | break; |
| 25 | case RTA_GATEWAY: |
William A. Kennington III | 6a92363 | 2022-11-06 18:17:33 -0800 | [diff] [blame] | 26 | gw.emplace(stdplus::raw::copyFromStrict<Addr>(data)); |
William A. Kennington III | a7344c3 | 2022-10-31 14:12:27 -0700 | [diff] [blame] | 27 | break; |
| 28 | } |
| 29 | } |
| 30 | if (ifIdx && gw) |
| 31 | { |
| 32 | return std::make_tuple(*ifIdx, *gw); |
| 33 | } |
| 34 | return std::nullopt; |
| 35 | } |
| 36 | |
| 37 | std::optional<std::tuple<unsigned, InAddrAny>> |
| 38 | gatewayFromRtm(std::string_view msg) |
| 39 | { |
| 40 | const auto& rtm = extractRtData<rtmsg>(msg); |
| 41 | if (rtm.rtm_table != RT_TABLE_MAIN || rtm.rtm_dst_len != 0) |
| 42 | { |
| 43 | return std::nullopt; |
| 44 | } |
| 45 | switch (rtm.rtm_family) |
| 46 | { |
| 47 | case AF_INET: |
| 48 | return parse<in_addr>(msg); |
| 49 | case AF_INET6: |
| 50 | return parse<in6_addr>(msg); |
| 51 | } |
| 52 | return std::nullopt; |
| 53 | } |
| 54 | |
William A. Kennington III | 6a92363 | 2022-11-06 18:17:33 -0800 | [diff] [blame] | 55 | AddressInfo addrFromRtm(std::string_view msg) |
| 56 | { |
| 57 | const auto& ifa = extractRtData<ifaddrmsg>(msg); |
| 58 | |
| 59 | AddressInfo ret; |
| 60 | ret.ifidx = ifa.ifa_index; |
| 61 | ret.flags = ifa.ifa_flags; |
| 62 | ret.scope = ifa.ifa_scope; |
| 63 | std::optional<InAddrAny> addr; |
| 64 | while (!msg.empty()) |
| 65 | { |
| 66 | auto [hdr, data] = extractRtAttr(msg); |
| 67 | if (hdr.rta_type == IFA_ADDRESS) |
| 68 | { |
| 69 | addr.emplace(addrFromBuf(ifa.ifa_family, data)); |
| 70 | } |
| 71 | else if (hdr.rta_type == IFA_FLAGS) |
| 72 | { |
| 73 | ret.flags = stdplus::raw::copyFromStrict<uint32_t>(data); |
| 74 | } |
| 75 | } |
| 76 | if (!addr) |
| 77 | { |
| 78 | throw std::runtime_error("Missing address"); |
| 79 | } |
| 80 | ret.ifaddr = {*addr, ifa.ifa_prefixlen}; |
| 81 | return ret; |
| 82 | } |
| 83 | |
William A. Kennington III | a7344c3 | 2022-10-31 14:12:27 -0700 | [diff] [blame] | 84 | } // namespace phosphor::network::netlink |