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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| /* | ||
| Copyright 2022 The Terway Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package tc | ||
|
|
||
| import ( | ||
| "encoding/binary" | ||
| "net" | ||
|
|
||
| "github.com/vishvananda/netlink" | ||
| "github.com/vishvananda/netlink/nl" | ||
| "golang.org/x/sys/unix" | ||
| ) | ||
|
|
||
| // FilterBySrcIP found u32 filter by pod ip | ||
| // used for prio only | ||
| func FilterBySrcIP(link netlink.Link, parent uint32, ipNet *net.IPNet) (*netlink.U32, error) { | ||
| filters, err := netlink.FilterList(link, parent) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| matches := U32MatchSrc(ipNet) | ||
| if len(matches) == 0 { | ||
| return nil, nil | ||
| } | ||
| OUT: | ||
| for _, f := range filters { | ||
| u32, ok := f.(*netlink.U32) | ||
| if !ok { | ||
| continue | ||
| } | ||
| if u32.Attrs().LinkIndex != link.Attrs().Index || | ||
| u32.Protocol != unix.ETH_P_IP || | ||
| u32.Sel == nil { | ||
| continue | ||
| } | ||
|
|
||
| // check all matches is satisfied with current | ||
| for _, m := range matches { | ||
| found := false | ||
| for _, key := range u32.Sel.Keys { | ||
| if key.Off != m.Off || key.Val != m.Val || key.Mask != m.Mask { | ||
| continue | ||
| } | ||
| found = true | ||
| break | ||
| } | ||
| if !found { | ||
| continue OUT | ||
| } | ||
| } | ||
| return u32, nil | ||
| } | ||
| return nil, nil | ||
| } | ||
|
|
||
| // MatchSrc add match for source ip | ||
| func MatchSrc(u32 *netlink.U32, ipNet *net.IPNet) { | ||
| if u32.Sel == nil { | ||
| u32.Sel = &netlink.TcU32Sel{ | ||
| Flags: nl.TC_U32_TERMINAL, | ||
| } | ||
| } | ||
|
|
||
| u32.Sel.Keys = append(u32.Sel.Keys, U32MatchSrc(ipNet)...) | ||
| u32.Sel.Nkeys = uint8(len(u32.Sel.Keys)) | ||
| } | ||
|
|
||
| // U32MatchSrc return u32 match key by src ip | ||
| func U32MatchSrc(ipNet *net.IPNet) []netlink.TcU32Key { | ||
| if ipNet.IP.To4() == nil { | ||
| return U32IPv6Src(ipNet) | ||
| } | ||
| return []netlink.TcU32Key{U32IPv4Src(ipNet)} | ||
| } | ||
|
|
||
| func U32IPv4Src(ipNet *net.IPNet) netlink.TcU32Key { | ||
| mask := net.IP(ipNet.Mask).To4() | ||
| val := ipNet.IP.Mask(ipNet.Mask).To4() | ||
| return netlink.TcU32Key{ | ||
| Mask: binary.BigEndian.Uint32(mask), | ||
| Val: binary.BigEndian.Uint32(val), | ||
| Off: 12, | ||
| } | ||
| } | ||
|
|
||
| func U32IPv6Src(ipNet *net.IPNet) []netlink.TcU32Key { | ||
| mask := ipNet.Mask | ||
| val := ipNet.IP.Mask(ipNet.Mask) | ||
|
|
||
| r := make([]netlink.TcU32Key, 0, 4) | ||
| for i := 0; i < 4; i++ { | ||
| m := binary.BigEndian.Uint32(mask) | ||
| if m != 0 { | ||
| r = append(r, netlink.TcU32Key{ | ||
| Mask: m, | ||
| Val: binary.BigEndian.Uint32(val), | ||
| Off: int32(8 + 4*i), | ||
| }) | ||
| } | ||
| mask = mask[4:] | ||
| val = val[4:] | ||
| } | ||
| return r | ||
| } |
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