btf: support for CO-RE relocations against kernel modules

It's now possible to use CO-RE relocations against types defined in kernel modules. See https://github.com/cilium/ebpf/pull/1300 by @brycekahle.

link: netkit support

The link package now allows attaching to netkit interfaces. See https://github.com/cilium/ebpf/pull/1257 by @hemanthmalla

link: support for iterating links

The new link.Iterator type allows enumerating all BPF links active. See https://github.com/cilium/ebpf/pull/1392 by @mpastyl.

Bugfixes

• ringbuf: fixed a bug which can lead to corrupt data on arm64, see https://github.com/cilium/ebpf/pull/1375

Breaking changes

github.com/cilium/ebpf

• ProgramOptions is not comparable anymore due to KernelModuleTypes.

github.com/cilium/ebpf/btf

• CORERelocate had its singature change once again.

What's Changed

• Add CO-RE support for kernel modules by @brycekahle in https://github.com/cilium/ebpf/pull/1300
• Create CONTRIBUTING.md by @sandipanpanda in https://github.com/cilium/ebpf/pull/1361
• build(deps): bump golangci/golangci-lint-action from 3.7.0 to 4.0.0 by @dependabot in https://github.com/cilium/ebpf/pull/1362
• build(deps): bump mkdocs-material from 9.5.8 to 9.5.12 in /docs by @dependabot in https://github.com/cilium/ebpf/pull/1363
• test: don't rely on append() to copy base slice by @ti-mo in https://github.com/cilium/ebpf/pull/1367
• Add support for netkit device by @hemanthmalla in https://github.com/cilium/ebpf/pull/1257
• docs: update project roles by @lmb in https://github.com/cilium/ebpf/pull/1374
• make rgo3 owner of features package by @lmb in https://github.com/cilium/ebpf/pull/1376
• ringbuf: replace clamp with min by @lmb in https://github.com/cilium/ebpf/pull/1377
• ringbuf: fix corrupt samples on arm64 by @paulcacheux in https://github.com/cilium/ebpf/pull/1375
• ringbuf: simplify ringReader by @lmb in https://github.com/cilium/ebpf/pull/1379
• CI: increase vm memory to avoid oomkills by @lmb in https://github.com/cilium/ebpf/pull/1378
• Add support for weak kfuncs by @dylandreimerink in https://github.com/cilium/ebpf/pull/1364
• CODEOWNERS: assign code ownership to florianl, mmat11 and dylandreimerink by @ti-mo in https://github.com/cilium/ebpf/pull/1382
• elf_reader_test: Fix CI by disabling the "test_log_fixup" selftest by @dylandreimerink in https://github.com/cilium/ebpf/pull/1385
• btf: use recursion in coreAreTypesCompatible by @lmb in https://github.com/cilium/ebpf/pull/1383
• link, internal: generate full linkinfo for union subtypes by @rgo3 in https://github.com/cilium/ebpf/pull/1359
• gh: do not hide internal/sys/types.go in diffs by @lmb in https://github.com/cilium/ebpf/pull/1388
• tests: clean up ClangEndian by @lmb in https://github.com/cilium/ebpf/pull/1389
• examples: avoid depending on internal packages by @ti-mo in https://github.com/cilium/ebpf/pull/1289
• doc: add DCO by @lmb in https://github.com/cilium/ebpf/pull/1396
• Fix GitHub edit link on every page by @remram44 in https://github.com/cilium/ebpf/pull/1393
• chore: fix some comments by @majorteach in https://github.com/cilium/ebpf/pull/1391
• miscellaneous test fixes by @lmb in https://github.com/cilium/ebpf/pull/1386
• link: add Iterator by @mpastyl in https://github.com/cilium/ebpf/pull/1392

New Contributors

• @sandipanpanda made their first contribution in https://github.com/cilium/ebpf/pull/1361
• @hemanthmalla made their first contribution in https://github.com/cilium/ebpf/pull/1257
• @remram44 made their first contribution in https://github.com/cilium/ebpf/pull/1393
• @majorteach made their first contribution in https://github.com/cilium/ebpf/pull/1391
• @mpastyl made their first contribution in https://github.com/cilium/ebpf/pull/1392

Full Changelog: https://github.com/cilium/ebpf/compare/v0.13.2...v0.14.0