doc: add bpfloader rc files from previous Android releases

Stripping comments since those are not interesting
for the purposes of what these things actually do.

Doing R+ since tethering apex only supports R+ now.

Generated via:
  (cd ../../../../../system/bpf && git cat-file -p remotes/aosp/android11-release:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk30-11-R.rc
  (cd ../../../../../system/bpf && git cat-file -p remotes/aosp/android12-release:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk31-12-S.rc
  (cd ../../../../../system/bpf && git cat-file -p remotes/aosp/android13-release:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk33-13-T.rc
  (cd ../../../../../system/bpf && git cat-file -p remotes/aosp/android14-release:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk34-14-U.rc
  (cd ../../../../../system/bpf && git cat-file -p remotes/aosp/main:bpfloader/bpfloader.rc;              ) | egrep -v '^ *#' > bpfloader-sdk34-14-U-QPR2.rc

Test: N/A
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Idd8032ce66ef07a1d9e42343e75b26d764e6d8c1

netbpfload/initrc-doc/README.txt

+This directory contains comment stripped versions of
+  //system/bpf/bpfloader/bpfloader.rc
+from previous versions of Android.
+
+Generated via:
+  (cd ../../../../../system/bpf && git cat-file -p remotes/aosp/android11-release:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk30-11-R.rc
+  (cd ../../../../../system/bpf && git cat-file -p remotes/aosp/android12-release:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk31-12-S.rc
+  (cd ../../../../../system/bpf && git cat-file -p remotes/aosp/android13-release:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk33-13-T.rc
+  (cd ../../../../../system/bpf && git cat-file -p remotes/aosp/android14-release:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk34-14-U.rc
+  (cd ../../../../../system/bpf && git cat-file -p remotes/aosp/main:bpfloader/bpfloader.rc;              ) | egrep -v '^ *#' > bpfloader-sdk34-14-U-QPR2.rc
+
+this is entirely equivalent to:
+  (cd /android1/system/bpf && git cat-file -p remotes/goog/rvc-dev:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk30-11-R.rc
+  (cd /android1/system/bpf && git cat-file -p remotes/goog/sc-dev:bpfloader/bpfloader.rc;  ) | egrep -v '^ *#' > bpfloader-sdk31-12-S.rc
+  (cd /android1/system/bpf && git cat-file -p remotes/goog/tm-dev:bpfloader/bpfloader.rc;  ) | egrep -v '^ *#' > bpfloader-sdk33-13-T.rc
+  (cd /android1/system/bpf && git cat-file -p remotes/goog/udc-dev:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk34-14-U.rc
+  (cd /android1/system/bpf && git cat-file -p remotes/goog/main:bpfloader/bpfloader.rc;    ) | egrep -v '^ *#' > bpfloader-sdk34-14-U-QPR2.rc
+
+it is also equivalent to:
+  (cd /android1/system/bpf && git cat-file -p remotes/goog/rvc-qpr-dev:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk30-11-R.rc
+  (cd /android1/system/bpf && git cat-file -p remotes/goog/sc-v2-dev:bpfloader/bpfloader.rc;   ) | egrep -v '^ *#' > bpfloader-sdk31-12-S.rc
+  (cd /android1/system/bpf && git cat-file -p remotes/goog/tm-qpr-dev:bpfloader/bpfloader.rc;  ) | egrep -v '^ *#' > bpfloader-sdk33-13-T.rc
+  (cd /android1/system/bpf && git cat-file -p remotes/goog/udc-qpr-dev:bpfloader/bpfloader.rc; ) | egrep -v '^ *#' > bpfloader-sdk34-14-U.rc
+
+ie. there were no changes between R/S/T and R/S/T QPR3, and no change between U and U QPR1.
+
+Note: Sv2 sdk/api level is actually 32, it just didn't change anything wrt. bpf, so doesn't matter.
+
+
+Key takeaways:
+
+= R bpfloader:
+  - CHOWN + SYS_ADMIN
+  - asynchronous startup
+  - platform only
+  - proc file setup handled by initrc
+
+= S bpfloader
+  - adds NET_ADMIN
+  - synchronous startup
+  - platform + mainline tethering offload
+
+= T bpfloader
+  - platform + mainline networking (including tethering offload)
+  - supported btf for maps via exec of btfloader
+
+= U bpfloader
+  - proc file setup moved into bpfloader binary
+  - explicitly specified user and groups:
+    group root graphics network_stack net_admin net_bw_acct net_bw_stats net_raw system
+    user root
+
+= U QPR2 bpfloader
+  - drops support of btf for maps
+  - invocation of /system/bin/netbpfload binary, which after handling *all*
+    networking bpf related things executes the platform /system/bin/bpfloader
+    which handles non-networking bpf.
+
+Note that there is now a copy of 'netbpfload' provided by the tethering apex
+mainline module at /apex/com.android.tethering/bin/netbpfload, which due
+to the use of execve("/system/bin/bpfloader") relies on T+ selinux which was
+added for btf map support (specifically the ability to exec the "btfloader").

netbpfload/initrc-doc/bpfloader-sdk30-11-R.rc

+on load_bpf_programs
+    write /proc/sys/net/core/bpf_jit_enable 1
+    write /proc/sys/net/core/bpf_jit_kallsyms 1
+    start bpfloader
+
+service bpfloader /system/bin/bpfloader
+    capabilities CHOWN SYS_ADMIN
+    rlimit memlock 1073741824 1073741824
+    oneshot
+    reboot_on_failure reboot,bpfloader-failed
+    updatable

netbpfload/initrc-doc/bpfloader-sdk31-12-S.rc

+on load_bpf_programs
+    write /proc/sys/net/core/bpf_jit_enable 1
+    write /proc/sys/net/core/bpf_jit_kallsyms 1
+    exec_start bpfloader
+
+service bpfloader /system/bin/bpfloader
+    capabilities CHOWN SYS_ADMIN NET_ADMIN
+    rlimit memlock 1073741824 1073741824
+    oneshot
+    reboot_on_failure reboot,bpfloader-failed
+    updatable

netbpfload/initrc-doc/bpfloader-sdk33-13-T.rc

+on load_bpf_programs
+    write /proc/sys/kernel/unprivileged_bpf_disabled 0
+    write /proc/sys/net/core/bpf_jit_enable 1
+    write /proc/sys/net/core/bpf_jit_kallsyms 1
+    exec_start bpfloader
+
+service bpfloader /system/bin/bpfloader
+    capabilities CHOWN SYS_ADMIN NET_ADMIN
+    rlimit memlock 1073741824 1073741824
+    oneshot
+    reboot_on_failure reboot,bpfloader-failed
+    updatable

netbpfload/initrc-doc/bpfloader-sdk34-14-U-QPR2.rc

+on load_bpf_programs
+    exec_start bpfloader
+
+service bpfloader /system/bin/netbpfload
+    capabilities CHOWN SYS_ADMIN NET_ADMIN
+    group root graphics network_stack net_admin net_bw_acct net_bw_stats net_raw system
+    user root
+    rlimit memlock 1073741824 1073741824
+    oneshot
+    reboot_on_failure reboot,bpfloader-failed
+    updatable

netbpfload/initrc-doc/bpfloader-sdk34-14-U.rc

+on load_bpf_programs
+    exec_start bpfloader
+
+service bpfloader /system/bin/bpfloader
+    capabilities CHOWN SYS_ADMIN NET_ADMIN
+    group root graphics network_stack net_admin net_bw_acct net_bw_stats net_raw system
+    user root
+    rlimit memlock 1073741824 1073741824
+    oneshot
+    reboot_on_failure reboot,bpfloader-failed
+    updatable