github.com/vishvananda/netlink@v1.3.1/protinfo_linux.go (about)

     1  package netlink
     2  
     3  import (
     4  	"errors"
     5  	"fmt"
     6  	"syscall"
     7  
     8  	"github.com/vishvananda/netlink/nl"
     9  	"golang.org/x/sys/unix"
    10  )
    11  
    12  // If the returned error is [ErrDumpInterrupted], results may be inconsistent
    13  // or incomplete.
    14  func LinkGetProtinfo(link Link) (Protinfo, error) {
    15  	return pkgHandle.LinkGetProtinfo(link)
    16  }
    17  
    18  // If the returned error is [ErrDumpInterrupted], results may be inconsistent
    19  // or incomplete.
    20  func (h *Handle) LinkGetProtinfo(link Link) (Protinfo, error) {
    21  	base := link.Attrs()
    22  	h.ensureIndex(base)
    23  	var pi Protinfo
    24  	req := h.newNetlinkRequest(unix.RTM_GETLINK, unix.NLM_F_DUMP)
    25  	msg := nl.NewIfInfomsg(unix.AF_BRIDGE)
    26  	req.AddData(msg)
    27  	msgs, executeErr := req.Execute(unix.NETLINK_ROUTE, 0)
    28  	if executeErr != nil && !errors.Is(executeErr, ErrDumpInterrupted) {
    29  		return pi, executeErr
    30  	}
    31  
    32  	for _, m := range msgs {
    33  		ans := nl.DeserializeIfInfomsg(m)
    34  		if int(ans.Index) != base.Index {
    35  			continue
    36  		}
    37  		attrs, err := nl.ParseRouteAttr(m[ans.Len():])
    38  		if err != nil {
    39  			return pi, err
    40  		}
    41  		for _, attr := range attrs {
    42  			if attr.Attr.Type != unix.IFLA_PROTINFO|unix.NLA_F_NESTED {
    43  				continue
    44  			}
    45  			infos, err := nl.ParseRouteAttr(attr.Value)
    46  			if err != nil {
    47  				return pi, err
    48  			}
    49  			pi = parseProtinfo(infos)
    50  
    51  			return pi, executeErr
    52  		}
    53  	}
    54  	return pi, fmt.Errorf("Device with index %d not found", base.Index)
    55  }
    56  
    57  func parseProtinfo(infos []syscall.NetlinkRouteAttr) (pi Protinfo) {
    58  	for _, info := range infos {
    59  		switch info.Attr.Type {
    60  		case nl.IFLA_BRPORT_MODE:
    61  			pi.Hairpin = byteToBool(info.Value[0])
    62  		case nl.IFLA_BRPORT_GUARD:
    63  			pi.Guard = byteToBool(info.Value[0])
    64  		case nl.IFLA_BRPORT_FAST_LEAVE:
    65  			pi.FastLeave = byteToBool(info.Value[0])
    66  		case nl.IFLA_BRPORT_PROTECT:
    67  			pi.RootBlock = byteToBool(info.Value[0])
    68  		case nl.IFLA_BRPORT_LEARNING:
    69  			pi.Learning = byteToBool(info.Value[0])
    70  		case nl.IFLA_BRPORT_UNICAST_FLOOD:
    71  			pi.Flood = byteToBool(info.Value[0])
    72  		case nl.IFLA_BRPORT_PROXYARP:
    73  			pi.ProxyArp = byteToBool(info.Value[0])
    74  		case nl.IFLA_BRPORT_PROXYARP_WIFI:
    75  			pi.ProxyArpWiFi = byteToBool(info.Value[0])
    76  		case nl.IFLA_BRPORT_ISOLATED:
    77  			pi.Isolated = byteToBool(info.Value[0])
    78  		case nl.IFLA_BRPORT_NEIGH_SUPPRESS:
    79  			pi.NeighSuppress = byteToBool(info.Value[0])
    80  		case nl.IFLA_BRPORT_VLAN_TUNNEL:
    81  			pi.VlanTunnel = byteToBool(info.Value[0])
    82  		}
    83  
    84  	}
    85  	return
    86  }