1 #include "system_queries.hpp"
2
3 #include "netlink.hpp"
4
5 #include <linux/ethtool.h>
6 #include <linux/rtnetlink.h>
7 #include <linux/sockios.h>
8 #include <net/if.h>
9
10 #include <phosphor-logging/lg2.hpp>
11 #include <stdplus/fd/create.hpp>
12 #include <stdplus/hash/tuple.hpp>
13 #include <stdplus/util/cexec.hpp>
14
15 #include <algorithm>
16 #include <format>
17 #include <optional>
18 #include <stdexcept>
19 #include <string_view>
20 #include <unordered_set>
21
22 namespace phosphor::network::system
23 {
24
25 using std::literals::string_view_literals::operator""sv;
26
getIFSock()27 static stdplus::Fd& getIFSock()
28 {
29 using namespace stdplus::fd;
30 static auto fd = socket(SocketDomain::INet, SocketType::Datagram,
31 SocketProto::IP);
32 return fd;
33 }
34
makeIFReq(std::string_view ifname)35 static ifreq makeIFReq(std::string_view ifname)
36 {
37 ifreq ifr = {};
38 const auto copied = std::min<std::size_t>(ifname.size(), IFNAMSIZ - 1);
39 std::copy_n(ifname.begin(), copied, ifr.ifr_name);
40 return ifr;
41 }
42
executeIFReq(std::string_view ifname,unsigned long cmd,void * data=nullptr)43 static ifreq executeIFReq(std::string_view ifname, unsigned long cmd,
44 void* data = nullptr)
45 {
46 ifreq ifr = makeIFReq(ifname);
47 ifr.ifr_data = reinterpret_cast<char*>(data);
48 getIFSock().ioctl(cmd, &ifr);
49 return ifr;
50 }
51
optionalIFReq(stdplus::zstring_view ifname,unsigned long long cmd,std::string_view cmdname,auto && complete,void * data=nullptr)52 inline auto optionalIFReq(stdplus::zstring_view ifname, unsigned long long cmd,
53 std::string_view cmdname, auto&& complete,
54 void* data = nullptr)
55 {
56 ifreq ifr;
57 std::optional<decltype(complete(ifr))> ret;
58 auto ukey = std::make_tuple(std::string(ifname), cmd);
59 static std::unordered_set<std::tuple<std::string, unsigned long long>>
60 unsupported;
61 try
62 {
63 ifr = executeIFReq(ifname, cmd, data);
64 }
65 catch (const std::system_error& e)
66 {
67 if (e.code() == std::errc::operation_not_supported)
68 {
69 if (unsupported.find(ukey) == unsupported.end())
70 {
71 unsupported.emplace(std::move(ukey));
72 lg2::info("{NET_IFREQ} not supported on {NET_INTF}",
73 "NET_IFREQ", cmdname, "NET_INTF", ifname);
74 }
75 return ret;
76 }
77 throw;
78 }
79 unsupported.erase(ukey);
80 ret.emplace(complete(ifr));
81 return ret;
82 }
83
getEthInfo(stdplus::zstring_view ifname)84 EthInfo getEthInfo(stdplus::zstring_view ifname)
85 {
86 ethtool_cmd edata = {};
87 edata.cmd = ETHTOOL_GSET;
88 return optionalIFReq(
89 ifname, SIOCETHTOOL, "ETHTOOL"sv,
90 [&](const ifreq&) {
91 return EthInfo{.autoneg = edata.autoneg != 0, .speed = edata.speed};
92 },
93 &edata)
94 .value_or(EthInfo{});
95 }
96
setMTU(std::string_view ifname,unsigned mtu)97 void setMTU(std::string_view ifname, unsigned mtu)
98 {
99 auto ifr = makeIFReq(ifname);
100 ifr.ifr_mtu = mtu;
101 getIFSock().ioctl(SIOCSIFMTU, &ifr);
102 }
103
setNICUp(std::string_view ifname,bool up)104 void setNICUp(std::string_view ifname, bool up)
105 {
106 ifreq ifr = executeIFReq(ifname, SIOCGIFFLAGS);
107 ifr.ifr_flags &= ~IFF_UP;
108 ifr.ifr_flags |= up ? IFF_UP : 0;
109 lg2::info("Setting NIC {UPDOWN} on {NET_INTF}", "UPDOWN",
110 up ? "up"sv : "down"sv, "NET_INTF", ifname);
111 getIFSock().ioctl(SIOCSIFFLAGS, &ifr);
112 }
113
deleteIntf(unsigned idx)114 void deleteIntf(unsigned idx)
115 {
116 if (idx == 0)
117 {
118 return;
119 }
120 ifinfomsg msg = {};
121 msg.ifi_family = AF_UNSPEC;
122 msg.ifi_index = idx;
123 netlink::performRequest(NETLINK_ROUTE, RTM_DELLINK, NLM_F_REPLACE, msg,
124 [&](const nlmsghdr& hdr, std::string_view data) {
125 int err = 0;
126 if (hdr.nlmsg_type == NLMSG_ERROR)
127 {
128 err = netlink::extractRtData<nlmsgerr>(data).error;
129 }
130 throw std::runtime_error(
131 std::format("Failed to delete `{}`: {}", idx, strerror(err)));
132 });
133 }
134
135 } // namespace phosphor::network::system
136