From 564bcd8de72335b4bfb82c135970f9e509836aae Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Iago=20L=C3=B3pez=20Galeiras?= Date: Mon, 16 Jan 2017 12:26:58 +0100 Subject: [PATCH] Add kinvolk/tcptracer-bpf dependency --- .../tcptracer-bpf/pkg/byteorder/LICENSE.txt | 201 ++++++++++++ .../tcptracer-bpf/pkg/byteorder/byteorder.go | 21 ++ .../tcptracer-bpf/pkg/offsetguess/LICENSE.txt | 201 ++++++++++++ .../pkg/offsetguess/offsetguess.go | 285 ++++++++++++++++++ .../offsetguess/offsetguess_unsupported.go | 13 + vendor/manifest | 20 +- 6 files changed, 740 insertions(+), 1 deletion(-) create mode 100644 vendor/github.com/kinvolk/tcptracer-bpf/pkg/byteorder/LICENSE.txt create mode 100644 vendor/github.com/kinvolk/tcptracer-bpf/pkg/byteorder/byteorder.go create mode 100644 vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/LICENSE.txt create mode 100644 vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/offsetguess.go create mode 100644 vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/offsetguess_unsupported.go diff --git a/vendor/github.com/kinvolk/tcptracer-bpf/pkg/byteorder/LICENSE.txt b/vendor/github.com/kinvolk/tcptracer-bpf/pkg/byteorder/LICENSE.txt new file mode 100644 index 0000000000..8dada3edaf --- /dev/null +++ b/vendor/github.com/kinvolk/tcptracer-bpf/pkg/byteorder/LICENSE.txt @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. For the purposes of this definition, + "control" means (i) the power, direct or indirect, to cause the + direction or management of such entity, whether by contract or + otherwise, or (ii) ownership of fifty percent (50%) or more of the + outstanding shares, or (iii) beneficial ownership of such entity. + + "You" (or "Your") shall mean an individual or Legal Entity + exercising permissions granted by this License. + + "Source" form shall mean the preferred form for making modifications, + including but not limited to software source code, documentation + source, and configuration files. + + "Object" form shall mean any form resulting from mechanical + transformation or translation of a Source form, including but + not limited to compiled object code, generated documentation, + and conversions to other media types. + + "Work" shall mean the work of authorship, whether in Source or + Object form, made available under the License, as indicated by a + copyright notice that is included in or attached to the work + (an example is provided in the Appendix below). + + "Derivative Works" shall mean any work, whether in Source or Object + form, that is based on (or derived from) the Work and for which the + editorial revisions, annotations, elaborations, or other modifications + represent, as a whole, an original work of authorship. For the purposes + of this License, Derivative Works shall not include works that remain + separable from, or merely link (or bind by name) to the interfaces of, + the Work and Derivative Works thereof. + + "Contribution" shall mean any work of authorship, including + the original version of the Work and any modifications or additions + to that Work or Derivative Works thereof, that is intentionally + submitted to Licensor for inclusion in the Work by the copyright owner + or by an individual or Legal Entity authorized to submit on behalf of + the copyright owner. For the purposes of this definition, "submitted" + means any form of electronic, verbal, or written communication sent + to the Licensor or its representatives, including but not limited to + communication on electronic mailing lists, source code control systems, + and issue tracking systems that are managed by, or on behalf of, the + Licensor for the purpose of discussing and improving the Work, but + excluding communication that is conspicuously marked or otherwise + designated in writing by the copyright owner as "Not a Contribution." + + "Contributor" shall mean Licensor and any individual or Legal Entity + on behalf of whom a Contribution has been received by Licensor and + subsequently incorporated within the Work. + + 2. Grant of Copyright License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + copyright license to reproduce, prepare Derivative Works of, + publicly display, publicly perform, sublicense, and distribute the + Work and such Derivative Works in Source or Object form. + + 3. Grant of Patent License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + (except as stated in this section) patent license to make, have made, + use, offer to sell, sell, import, and otherwise transfer the Work, + where such license applies only to those patent claims licensable + by such Contributor that are necessarily infringed by their + Contribution(s) alone or by combination of their Contribution(s) + with the Work to which such Contribution(s) was submitted. If You + institute patent litigation against any entity (including a + cross-claim or counterclaim in a lawsuit) alleging that the Work + or a Contribution incorporated within the Work constitutes direct + or contributory patent infringement, then any patent licenses + granted to You under this License for that Work shall terminate + as of the date such litigation is filed. + + 4. Redistribution. You may reproduce and distribute copies of the + Work or Derivative Works thereof in any medium, with or without + modifications, and in Source or Object form, provided that You + meet the following conditions: + + (a) You must give any other recipients of the Work or + Derivative Works a copy of this License; and + + (b) You must cause any modified files to carry prominent notices + stating that You changed the files; and + + (c) You must retain, in the Source form of any Derivative Works + that You distribute, all copyright, patent, trademark, and + attribution notices from the Source form of the Work, + excluding those notices that do not pertain to any part of + the Derivative Works; and + + (d) If the Work includes a "NOTICE" text file as part of its + distribution, then any Derivative Works that You distribute must + include a readable copy of the attribution notices contained + within such NOTICE file, excluding those notices that do not + pertain to any part of the Derivative Works, in at least one + of the following places: within a NOTICE text file distributed + as part of the Derivative Works; within the Source form or + documentation, if provided along with the Derivative Works; or, + within a display generated by the Derivative Works, if and + wherever such third-party notices normally appear. The contents + of the NOTICE file are for informational purposes only and + do not modify the License. You may add Your own attribution + notices within Derivative Works that You distribute, alongside + or as an addendum to the NOTICE text from the Work, provided + that such additional attribution notices cannot be construed + as modifying the License. + + You may add Your own copyright statement to Your modifications and + may provide additional or different license terms and conditions + for use, reproduction, or distribution of Your modifications, or + for any such Derivative Works as a whole, provided Your use, + reproduction, and distribution of the Work otherwise complies with + the conditions stated in this License. + + 5. Submission of Contributions. Unless You explicitly state otherwise, + any Contribution intentionally submitted for inclusion in the Work + by You to the Licensor shall be under the terms and conditions of + this License, without any additional terms or conditions. + Notwithstanding the above, nothing herein shall supersede or modify + the terms of any separate license agreement you may have executed + with Licensor regarding such Contributions. + + 6. Trademarks. This License does not grant permission to use the trade + names, trademarks, service marks, or product names of the Licensor, + except as required for reasonable and customary use in describing the + origin of the Work and reproducing the content of the NOTICE file. + + 7. Disclaimer of Warranty. Unless required by applicable law or + agreed to in writing, Licensor provides the Work (and each + Contributor provides its Contributions) on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + implied, including, without limitation, any warranties or conditions + of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A + PARTICULAR PURPOSE. You are solely responsible for determining the + appropriateness of using or redistributing the Work and assume any + risks associated with Your exercise of permissions under this License. + + 8. Limitation of Liability. In no event and under no legal theory, + whether in tort (including negligence), contract, or otherwise, + unless required by applicable law (such as deliberate and grossly + negligent acts) or agreed to in writing, shall any Contributor be + liable to You for damages, including any direct, indirect, special, + incidental, or consequential damages of any character arising as a + result of this License or out of the use or inability to use the + Work (including but not limited to damages for loss of goodwill, + work stoppage, computer failure or malfunction, or any and all + other commercial damages or losses), even if such Contributor + has been advised of the possibility of such damages. + + 9. Accepting Warranty or Additional Liability. While redistributing + the Work or Derivative Works thereof, You may choose to offer, + and charge a fee for, acceptance of support, warranty, indemnity, + or other liability obligations and/or rights consistent with this + License. However, in accepting such obligations, You may act only + on Your own behalf and on Your sole responsibility, not on behalf + of any other Contributor, and only if You agree to indemnify, + defend, and hold each Contributor harmless for any liability + incurred by, or claims asserted against, such Contributor by reason + of your accepting any such warranty or additional liability. + + END OF TERMS AND CONDITIONS + + APPENDIX: How to apply the Apache License to your work. + + To apply the Apache License to your work, attach the following + boilerplate notice, with the fields enclosed by brackets "{}" + replaced with your own identifying information. (Don't include + the brackets!) The text should be enclosed in the appropriate + comment syntax for the file format. We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright {yyyy} {name of copyright owner} + + 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. diff --git a/vendor/github.com/kinvolk/tcptracer-bpf/pkg/byteorder/byteorder.go b/vendor/github.com/kinvolk/tcptracer-bpf/pkg/byteorder/byteorder.go new file mode 100644 index 0000000000..290f76b165 --- /dev/null +++ b/vendor/github.com/kinvolk/tcptracer-bpf/pkg/byteorder/byteorder.go @@ -0,0 +1,21 @@ +package byteorder + +import ( + "encoding/binary" + "unsafe" +) + +var Host binary.ByteOrder + +// In lack of binary.HostEndian ... +func init() { + var i int32 = 0x01020304 + u := unsafe.Pointer(&i) + pb := (*byte)(u) + b := *pb + if b == 0x04 { + Host = binary.LittleEndian + } else { + Host = binary.BigEndian + } +} diff --git a/vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/LICENSE.txt b/vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/LICENSE.txt new file mode 100644 index 0000000000..8dada3edaf --- /dev/null +++ b/vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/LICENSE.txt @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. For the purposes of this definition, + "control" means (i) the power, direct or indirect, to cause the + direction or management of such entity, whether by contract or + otherwise, or (ii) ownership of fifty percent (50%) or more of the + outstanding shares, or (iii) beneficial ownership of such entity. + + "You" (or "Your") shall mean an individual or Legal Entity + exercising permissions granted by this License. + + "Source" form shall mean the preferred form for making modifications, + including but not limited to software source code, documentation + source, and configuration files. + + "Object" form shall mean any form resulting from mechanical + transformation or translation of a Source form, including but + not limited to compiled object code, generated documentation, + and conversions to other media types. + + "Work" shall mean the work of authorship, whether in Source or + Object form, made available under the License, as indicated by a + copyright notice that is included in or attached to the work + (an example is provided in the Appendix below). + + "Derivative Works" shall mean any work, whether in Source or Object + form, that is based on (or derived from) the Work and for which the + editorial revisions, annotations, elaborations, or other modifications + represent, as a whole, an original work of authorship. For the purposes + of this License, Derivative Works shall not include works that remain + separable from, or merely link (or bind by name) to the interfaces of, + the Work and Derivative Works thereof. + + "Contribution" shall mean any work of authorship, including + the original version of the Work and any modifications or additions + to that Work or Derivative Works thereof, that is intentionally + submitted to Licensor for inclusion in the Work by the copyright owner + or by an individual or Legal Entity authorized to submit on behalf of + the copyright owner. For the purposes of this definition, "submitted" + means any form of electronic, verbal, or written communication sent + to the Licensor or its representatives, including but not limited to + communication on electronic mailing lists, source code control systems, + and issue tracking systems that are managed by, or on behalf of, the + Licensor for the purpose of discussing and improving the Work, but + excluding communication that is conspicuously marked or otherwise + designated in writing by the copyright owner as "Not a Contribution." + + "Contributor" shall mean Licensor and any individual or Legal Entity + on behalf of whom a Contribution has been received by Licensor and + subsequently incorporated within the Work. + + 2. Grant of Copyright License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + copyright license to reproduce, prepare Derivative Works of, + publicly display, publicly perform, sublicense, and distribute the + Work and such Derivative Works in Source or Object form. + + 3. Grant of Patent License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + (except as stated in this section) patent license to make, have made, + use, offer to sell, sell, import, and otherwise transfer the Work, + where such license applies only to those patent claims licensable + by such Contributor that are necessarily infringed by their + Contribution(s) alone or by combination of their Contribution(s) + with the Work to which such Contribution(s) was submitted. If You + institute patent litigation against any entity (including a + cross-claim or counterclaim in a lawsuit) alleging that the Work + or a Contribution incorporated within the Work constitutes direct + or contributory patent infringement, then any patent licenses + granted to You under this License for that Work shall terminate + as of the date such litigation is filed. + + 4. Redistribution. You may reproduce and distribute copies of the + Work or Derivative Works thereof in any medium, with or without + modifications, and in Source or Object form, provided that You + meet the following conditions: + + (a) You must give any other recipients of the Work or + Derivative Works a copy of this License; and + + (b) You must cause any modified files to carry prominent notices + stating that You changed the files; and + + (c) You must retain, in the Source form of any Derivative Works + that You distribute, all copyright, patent, trademark, and + attribution notices from the Source form of the Work, + excluding those notices that do not pertain to any part of + the Derivative Works; and + + (d) If the Work includes a "NOTICE" text file as part of its + distribution, then any Derivative Works that You distribute must + include a readable copy of the attribution notices contained + within such NOTICE file, excluding those notices that do not + pertain to any part of the Derivative Works, in at least one + of the following places: within a NOTICE text file distributed + as part of the Derivative Works; within the Source form or + documentation, if provided along with the Derivative Works; or, + within a display generated by the Derivative Works, if and + wherever such third-party notices normally appear. The contents + of the NOTICE file are for informational purposes only and + do not modify the License. You may add Your own attribution + notices within Derivative Works that You distribute, alongside + or as an addendum to the NOTICE text from the Work, provided + that such additional attribution notices cannot be construed + as modifying the License. + + You may add Your own copyright statement to Your modifications and + may provide additional or different license terms and conditions + for use, reproduction, or distribution of Your modifications, or + for any such Derivative Works as a whole, provided Your use, + reproduction, and distribution of the Work otherwise complies with + the conditions stated in this License. + + 5. Submission of Contributions. Unless You explicitly state otherwise, + any Contribution intentionally submitted for inclusion in the Work + by You to the Licensor shall be under the terms and conditions of + this License, without any additional terms or conditions. + Notwithstanding the above, nothing herein shall supersede or modify + the terms of any separate license agreement you may have executed + with Licensor regarding such Contributions. + + 6. Trademarks. This License does not grant permission to use the trade + names, trademarks, service marks, or product names of the Licensor, + except as required for reasonable and customary use in describing the + origin of the Work and reproducing the content of the NOTICE file. + + 7. Disclaimer of Warranty. Unless required by applicable law or + agreed to in writing, Licensor provides the Work (and each + Contributor provides its Contributions) on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + implied, including, without limitation, any warranties or conditions + of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A + PARTICULAR PURPOSE. You are solely responsible for determining the + appropriateness of using or redistributing the Work and assume any + risks associated with Your exercise of permissions under this License. + + 8. Limitation of Liability. In no event and under no legal theory, + whether in tort (including negligence), contract, or otherwise, + unless required by applicable law (such as deliberate and grossly + negligent acts) or agreed to in writing, shall any Contributor be + liable to You for damages, including any direct, indirect, special, + incidental, or consequential damages of any character arising as a + result of this License or out of the use or inability to use the + Work (including but not limited to damages for loss of goodwill, + work stoppage, computer failure or malfunction, or any and all + other commercial damages or losses), even if such Contributor + has been advised of the possibility of such damages. + + 9. Accepting Warranty or Additional Liability. While redistributing + the Work or Derivative Works thereof, You may choose to offer, + and charge a fee for, acceptance of support, warranty, indemnity, + or other liability obligations and/or rights consistent with this + License. However, in accepting such obligations, You may act only + on Your own behalf and on Your sole responsibility, not on behalf + of any other Contributor, and only if You agree to indemnify, + defend, and hold each Contributor harmless for any liability + incurred by, or claims asserted against, such Contributor by reason + of your accepting any such warranty or additional liability. + + END OF TERMS AND CONDITIONS + + APPENDIX: How to apply the Apache License to your work. + + To apply the Apache License to your work, attach the following + boilerplate notice, with the fields enclosed by brackets "{}" + replaced with your own identifying information. (Don't include + the brackets!) The text should be enclosed in the appropriate + comment syntax for the file format. We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright {yyyy} {name of copyright owner} + + 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. diff --git a/vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/offsetguess.go b/vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/offsetguess.go new file mode 100644 index 0000000000..78ebf51673 --- /dev/null +++ b/vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/offsetguess.go @@ -0,0 +1,285 @@ +// +build linux + +package offsetguess + +import ( + "encoding/binary" + "fmt" + "math/rand" + "net" + "os" + "strconv" + "strings" + "syscall" + "time" + "unsafe" + + "github.com/iovisor/gobpf/elf" + + "github.com/kinvolk/tcptracer-bpf/pkg/byteorder" +) + +type tcpTracerState uint64 + +const ( + uninitialized tcpTracerState = iota + checking + checked + ready +) + +type guessWhat uint64 + +const ( + guessSaddr guessWhat = iota + guessDaddr + guessFamily + guessSport + guessDport + guessNetns + guessDaddrIPv6 +) + +type tcpTracerStatus struct { + status tcpTracerState + pidTgid uint64 + what guessWhat + offsetSaddr uint64 + offsetDaddr uint64 + offsetSport uint64 + offsetDport uint64 + offsetNetns uint64 + offsetIno uint64 + offsetFamily uint64 + offsetDaddrIPv6 uint64 + err byte + saddr uint32 + daddr uint32 + sport uint16 + dport uint16 + netns uint32 + family uint16 + daddrIPv6 [4]uint32 +} + +func listen(url, netType string, finish chan struct{}) { + l, err := net.Listen(netType, url) + if err != nil { + panic(err) + } + select { + case <-finish: + l.Close() + return + } +} + +func compareIPv6(a, b [4]uint32) bool { + for i := 0; i < 4; i++ { + if a[i] != b[i] { + return false + } + } + return true +} + +func ownNetNS() (uint64, error) { + var s syscall.Stat_t + if err := syscall.Stat("/proc/self/ns/net", &s); err != nil { + return 0, err + } + return s.Ino, nil +} + +func ipFromUint32Arr(ipv6Addr [4]uint32) net.IP { + buf := make([]byte, 16) + for i := 0; i < 16; i++ { + buf[i] = *(*byte)(unsafe.Pointer((uintptr(unsafe.Pointer(&ipv6Addr[0])) + uintptr(i)))) + } + return net.IP(buf) +} + +func htons(a uint16) uint16 { + arr := make([]byte, 2) + binary.BigEndian.PutUint16(arr, a) + return byteorder.Host.Uint16(arr) +} + +// Guess expects elf.Module to hold a tcptracer-bpf object and initializes +// the tracer by guessing the right kernel struct offsets. Results are +// stored in the `tcptracer_status` map as used by the module. +func Guess(b *elf.Module) error { + listenIP := "127.0.0.2" + listenPort := uint16(9091) + bindAddress := fmt.Sprintf("%s:%d", listenIP, listenPort) + + finish := make(chan struct{}) + go listen(bindAddress, "tcp4", finish) + defer close(finish) + time.Sleep(300 * time.Millisecond) + + currentNetns, err := ownNetNS() + if err != nil { + return fmt.Errorf("error getting current netns: %v", err) + } + + mp := b.Map("tcptracer_status") + + var zero uint64 + pidTgid := uint64(os.Getpid()<<32 | syscall.Gettid()) + + status := tcpTracerStatus{ + status: checking, + pidTgid: pidTgid, + } + + err = b.UpdateElement(mp, unsafe.Pointer(&zero), unsafe.Pointer(&status), 0) + if err != nil { + return fmt.Errorf("error initializing tcptracer_status map: %v", err) + } + + dport := htons(listenPort) + + // 127.0.0.1 + saddr := 0x0100007F + // 127.0.0.2 + daddr := 0x0200007F + // will be set later + sport := 0 + netns := uint32(currentNetns) + family := syscall.AF_INET + + for status.status != ready { + var daddrIPv6 [4]uint32 + + daddrIPv6[0] = rand.Uint32() + daddrIPv6[1] = rand.Uint32() + daddrIPv6[2] = rand.Uint32() + daddrIPv6[3] = rand.Uint32() + + ip := ipFromUint32Arr(daddrIPv6) + + if status.what != guessDaddrIPv6 { + conn, err := net.Dial("tcp4", bindAddress) + if err != nil { + fmt.Printf("error: %v\n", err) + } + + sport, err = strconv.Atoi(strings.Split(conn.LocalAddr().String(), ":")[1]) + if err != nil { + return fmt.Errorf("error converting source port: %v", err) + } + + sport = int(htons(uint16(sport))) + + // set SO_LINGER to 0 so the connection state after closing is + // CLOSE instead of TIME_WAIT. In this way, they will disappear + // from the conntrack table after around 10 seconds instead of 2 + // minutes + if tcpConn, ok := conn.(*net.TCPConn); ok { + tcpConn.SetLinger(0) + } else { + return fmt.Errorf("not a tcp connection unexpectedly") + } + + conn.Close() + } else { + conn, err := net.Dial("tcp6", fmt.Sprintf("[%s]:9092", ip)) + if err == nil { + conn.Close() + } + } + + err = b.LookupElement(mp, unsafe.Pointer(&zero), unsafe.Pointer(&status)) + if err != nil { + return fmt.Errorf("error reading tcptracer_status: %v", err) + } + + if status.status == checked { + switch status.what { + case guessSaddr: + if status.saddr == uint32(saddr) { + status.what++ + status.status = checking + } else { + status.offsetSaddr++ + status.status = checking + status.saddr = uint32(saddr) + } + case guessDaddr: + if status.daddr == uint32(daddr) { + status.what++ + status.status = checking + } else { + status.offsetDaddr++ + status.status = checking + status.daddr = uint32(daddr) + } + case guessFamily: + if status.family == uint16(family) { + status.what++ + status.status = checking + // we know the sport ((struct inet_sock)->inet_sport) is + // after the family field, so we start from there + status.offsetSport = status.offsetFamily + } else { + status.offsetFamily++ + status.status = checking + } + case guessSport: + if status.sport == uint16(sport) { + status.what++ + status.status = checking + } else { + status.offsetSport++ + status.status = checking + } + case guessDport: + if status.dport == dport { + status.what++ + status.status = checking + } else { + status.offsetDport++ + status.status = checking + } + case guessNetns: + if status.netns == netns { + status.what++ + status.status = checking + } else { + status.offsetIno++ + // go to the next offsetNetns if we get an error + if status.err != 0 || status.offsetIno >= 200 { + status.offsetIno = 0 + status.offsetNetns++ + } + status.status = checking + } + case guessDaddrIPv6: + if compareIPv6(status.daddrIPv6, daddrIPv6) { + status.what++ + status.status = ready + } else { + status.offsetDaddrIPv6++ + status.status = checking + } + default: + return fmt.Errorf("unexpected field") + } + } + + err = b.UpdateElement(mp, unsafe.Pointer(&zero), unsafe.Pointer(&status), 0) + if err != nil { + return fmt.Errorf("error updating tcptracer_status: %v", err) + } + + if status.offsetSaddr >= 200 || status.offsetDaddr >= 200 || + status.offsetSport >= 2000 || status.offsetDport >= 200 || + status.offsetNetns >= 200 || status.offsetFamily >= 200 || + status.offsetDaddrIPv6 >= 200 { + return fmt.Errorf("overflow, bailing out") + } + } + + return nil +} diff --git a/vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/offsetguess_unsupported.go b/vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/offsetguess_unsupported.go new file mode 100644 index 0000000000..705b37ca00 --- /dev/null +++ b/vendor/github.com/kinvolk/tcptracer-bpf/pkg/offsetguess/offsetguess_unsupported.go @@ -0,0 +1,13 @@ +// +build !linux + +package offsetguess + +import ( + "fmt" + + "github.com/iovisor/gobpf/elf" +) + +func Guess(b *elf.Module) error { + return fmt.Errorf("not supported on non-Linux systems") +} diff --git a/vendor/manifest b/vendor/manifest index f6c4104467..b45c2be7d7 100644 --- a/vendor/manifest +++ b/vendor/manifest @@ -995,6 +995,24 @@ "revision": "77ed1c8a01217656d2080ad51981f6e99adaa177", "branch": "master" }, + { + "importpath": "github.com/kinvolk/tcptracer-bpf/pkg/byteorder", + "repository": "https://github.com/kinvolk/tcptracer-bpf", + "vcs": "git", + "revision": "db8982b008c342800324556dab4f5fbf32e96c47", + "branch": "master", + "path": "pkg/byteorder", + "notests": true + }, + { + "importpath": "github.com/kinvolk/tcptracer-bpf/pkg/offsetguess", + "repository": "https://github.com/kinvolk/tcptracer-bpf", + "vcs": "git", + "revision": "b021c81f340f16376990ab9566ed1cace8ee9311", + "branch": "master", + "path": "/pkg/offsetguess", + "notests": true + }, { "importpath": "github.com/kr/pretty", "repository": "https://github.com/kr/pretty", @@ -1582,4 +1600,4 @@ "branch": "master" } ] -} +} \ No newline at end of file