//system/bpf/libbpf_android:libbpf_android clang-tidy Loader.cpp
system/bpf/libbpf_android/Loader.cpp:133:5: warning: Value stored to 'entries' is never read [clang-analyzer-deadcode.DeadStores]
entries = shTable.size();
^
system/bpf/libbpf_android/Loader.cpp:133:5: note: Value stored to 'entries' is never read
Test: builds without warnings
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I548976b59d44a51e992c9520e730fc9dae82fce2
Maciej Żenczykowskicommited 2021-01-19 21:18:20 +00:00
Tested via:
packages/modules/Connectivity/Tethering/Tethering/bpf_progs/offload.c:
+DEFINE_BPF_PROG_KVER("xdp/test", AID_ROOT, AID_ROOT,
+ xdp_test, KVER(5, 10, 0))
+(struct xdp_md *ctx) {
+ return XDP_PASS;
+}
vsoc_x86:/ # ip link show dev lo
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
vsoc_x86:/ # ip link set dev lo xdp pinned /sys/fs/bpf/prog_offload_xdp_test
vsoc_x86:/ # ip link show dev lo
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 xdpgeneric qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
prog/xdp id 3 tag 3b185187f1855c4c jited
vsoc_x86:/ # ip link set dev lo xdp off
vsoc_x86:/ # ip link show dev lo
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
Test: atest, TreeHugger
Bug: 167540099
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I7472d6d8120344abde9ea0f44c59a46f30da77f1
Maciej Żenczykowskicommited 2021-01-07 14:51:20 -08:00
Logging every 5s isn't actually useful and it just gets the important stuff out
of log buffers.
Test: adb logcat -s 'bpfloader:D' 'BpfUtils:D' 'LibBpfLoader:D'
...
06-17 01:02:34.205 433 433 E bpfloader: --- DO NOT EXPECT SYSTEM TO BOOT SUCCESSFULLY ---
06-17 01:02:38.103 335 335 W LibBpfLoader: Waited 5s for bpf.progs_loaded, still waiting...
06-17 01:02:48.104 335 335 W LibBpfLoader: Waited 10s for bpf.progs_loaded, still waiting...
06-17 01:03:08.104 335 335 W LibBpfLoader: Waited 20s for bpf.progs_loaded, still waiting...
06-17 01:04:12.226 335 335 W LibBpfLoader: Waited 60s for bpf.progs_loaded, still waiting...
06-17 01:04:17.628 1324 1324 W LibBpfLoader: Waited 5s for bpf.progs_loaded, still waiting...
06-17 01:04:27.629 1324 1324 W LibBpfLoader: Waited 10s for bpf.progs_loaded, still waiting...
06-17 01:04:47.629 1324 1324 W LibBpfLoader: Waited 20s for bpf.progs_loaded, still waiting...
06-17 01:05:50.163 1324 1324 W LibBpfLoader: Waited 60s for bpf.progs_loaded, still waiting...
06-17 01:05:55.551 1741 1741 W LibBpfLoader: Waited 5s for bpf.progs_loaded, still waiting...
Bug: 150040815
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I77b82bf44141df8ffab1d11d01a89c3927fbe827
Maciej Żenczykowskicommited 2020-06-17 21:24:55 +00:00
This is useful for critical functions with fallbacks, but
may even be useful for non-critical functions, where a function
in the middle of the file may fail to load, but you still want
other (later) functions to be attempted.
Critical applies to the entire .c file (or to be more correct to
the entire resulting .o). Optional applies to a specific section
of that .o (ie. a specific individual function).
This new optional attribute is necessary to be able to declare
a .c/.o file critical even if *some* of the individual functions
might fail to load due to missing kernel patches.
(Note: we currently have no way to specify a map as optional)
Critical guarantees that all non-optional programs, and all maps,
have been created, pinned, chowned, and chmoded successfully
(or that they already existed).
For an example of use see:
system/netd/bpf_progs/offload.c
(while at it also add retrieveProgram() and mapRetrieve{RW,RO,WO}()
helpers to BpfUtils.h)
Test: builds, atest, see paired netd change for extra details
Bug: 150040815
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I50b292c061b05fc8f4b4b8574f128345c45c78db
Maciej Żenczykowskicommited 2020-06-17 10:44:19 +00:00
Reasoning: critical load failures for netd bpf programs will just result
in unpredictable behaviour later on. For example netd/systemserver
crash loops.
Test: builds
Bug: 150040815
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Iefa01e60cd0a9a223e96411726a199bfb4857a5a
Maciej Żenczykowskicommited 2020-06-15 08:01:50 +00:00
... which also means waitForProgsLoaded() has to be a no-op on pre-bpf devices.
This is more consistent: it's weird to have bpf.progs_loaded set on a 4.4 device.
Test: builds, atest
Bug: 150040815
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Iddabcf56c187ea518dd2e4d8db451b2f6902aa8e
Maciej Żenczykowskicommited 2020-06-13 22:41:48 -07:00
Fixes:
system/bpf/libbpf_android/Loader.cpp:557:49: warning: 'find_last_of' called with a string literal consisting of a single character; consider using the more effective overload accepting a character [performance-faster-string-find]
name = name.substr(0, name.find_last_of("$"));
^~~
'$'
Test: builds
Bug: 153035880
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Iea62a59380c155796a7fa2ac4ca3352f9236ba98
Maciej Żenczykowskicommited 2020-04-24 04:18:00 +00:00
bpf program section names must be unique to prevent programs from
appending to each other, so instead the bpf loader will strip
everything past the final $ symbol when actually pinning
the program into the filesystem.
While at it add a little bit more logging.
Example on aosp cuttlefish 5.4.30 virtual device:
D LibBpfLoader: bpf_prog_load lib call for /system/etc/bpf/offload.o (schedcls_ingress_tether_ether) returned fd: 8 (no error)
D LibBpfLoader: cs[1].name:schedcls_ingress_tether_rawip$stub min_kver:0 .max_kver:40e00 (kvers:5041e)
D LibBpfLoader: cs[2].name:schedcls_ingress_tether_rawip$4_14 min_kver:40e00 .max_kver:ffffffff (kvers:5041e)
D LibBpfLoader: bpf_prog_load lib call for /system/etc/bpf/offload.o (schedcls_ingress_tether_rawip$4_14) returned fd: 9 (no error)
I bpfloader: Attempted load object: /system/etc/bpf/offload.o, ret: Success
$ adb shell ls -l /sys/fs/bpf | egrep offload
-rw-rw---- 1 root network_stack 0 2020-04-22 01:27 map_offload_tether_ingress_map
-rw-rw---- 1 root network_stack 0 2020-04-22 01:27 map_offload_tether_stats_map
-r--r----- 1 root root 0 2020-04-22 01:27 prog_offload_schedcls_ingress_tether_ether
-r--r----- 1 root root 0 2020-04-22 01:27 prog_offload_schedcls_ingress_tether_rawip
Test: builds, atest, proper program loaded on 5.4.30 aosp cuttlefish
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Id3fcb8e2a6b0087f704e77726e9961efc6145739
Maciej Żenczykowskicommited 2020-04-21 18:29:58 -07:00
Some ebpf code cannot be loaded on too old kernels.
Sometimes we want a different - more advanced - version of an ebpf program
to be loaded on a newer kernel.
Test: build, atest
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I9e93e7246951916e6d60544575337a7a19c82886
Maciej Żenczykowskicommited 2020-02-19 15:46:23 -08:00
Unlike maps, BPF programs currently have no natural place to declare
metadata like their desired owner & group. Add a bpf_prog_def struct
to allow setting these, located in a new "progs" section, and update
bpfloader to chown pinned programs appropriately based on this
information.
Add a #DEFINE_BPF_PROG macro to simplify adding this data for
programs. The struct name is the name of the corresponding function
with "_def" appended, which bpfloader uses to correlate a bpf_map_def
with the correct program.
Also have bpfloader set mode to 0440 for all programs, since only read
access should ever be needed
Bug: 149434314
Test: load a program that uses DEFINE_BPF_PROG and check that owner &
group are set as expected
Change-Id: I914c355f114368fe53de2c7f272d877463cba461
Signed-off-by: Connor O'Brien <connoro@google.com>
Connor O'Brienauthored and Maciej Żenczykowskicommited 2020-02-14 23:28:44 +00:00
(we don't want to truncate this output, since it can be very useful
for debugging failures)
Test: builds, more useful ebpf load failure logs
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I817853f33b7f59296a041fb0d26ca3ae502b29da
Maciej Żenczykowskicommited 2020-02-11 19:12:34 -08:00
Creating a function for this rather than having people copy/paste a loop
there.
It's very intentional that there is no timeout here. If bpfloader is
down, there is a serious problem, and we shouldn't let code move forward
in a state where it may not have been tested.
Bug: 140330870
Test: boot & use bpf/netd
Change-Id: I358d1fcf77ad5406e294dd57307bc411e2c8ad6a
Steven Morelandcommited 2020-01-10 15:37:53 -08:00
Currently, if a bpf program object has no map section, this error is
propagated, and the program will fail to load. However, it is desirable
to have programs without any map.
Bug: 140330870
Test: load program w/ bpf w/o maps section
Change-Id: Ia53c699212a8cb962e3c2db562921880fef0cce0
Steven Morelandcommited 2020-01-10 13:33:03 -08:00
errno is left unchanged on successful calls to this function, so it is
confusing to log it in the success path.
Fixes: 146171927
Test: looking at logs
Change-Id: Ia424dd865bd518d8c533e99fb1a64b02bc92e759
Steven Morelandcommited 2019-12-12 17:24:00 -08:00
Using unique_fd to ensure we release bpf prog fds when they are no
longer needed.
Change-Id: I9d5c2673c7e1bdf05052771e06ac78cec21957ec
Merged-In: I9d5c2673c7e1bdf05052771e06ac78cec21957ec
Signed-off-by: Connor O'Brien <connoro@google.com>
(cherry picked from commit 206dd3381e)
Connor O'Brienauthored and Maciej Żenczykowskicommited 2019-11-13 21:58:28 -08:00
The return of bpf_prog_load() library call is insufficient, we also need
errno to know what the bpf(2) syscall did.
Bug: 143236645
Change-Id: Id2c543fdb63b1e077278a8b1ede03a21afad74dc
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Joel Fernandes (Google)authored and Joel Fernandescommited 2019-11-08 16:51:11 -05:00
Changed finds that use a string with a single character ("X"), to 'X'.
Remove using statements from header file.
Add a couple of missing includes.
Changed a couple of functions that take a string to const string& to
avoid extra copies.
Test: No warnings when compiled, unit tests pass.
Change-Id: I218ee0e6b6c7fb1c79d1337c1ce3d6f1e318a3cd
Christopher Ferriscommited 2019-02-01 15:48:19 -08:00
Add support for cgroup socket filter program loading in bpfloader,
and create a uid permission map to store the uids that have INTERNET
permission.
Bug: 111560570
Bug: 111560739
Test: dumpsys netd trafficcontroller
Change-Id: I658f533d302cb594d7b36d4a3a2a70e394874c33
which maps to BPF_PROG_TYPE_SCHED_CLS
Bug: 65674744
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I7ca5912756c575e2c0667b9dae2d24471845e028
Maciej Żenczykowskicommited 2019-01-24 23:16:10 -08:00
* Wrote a relocatable ELF loader from scratch. The loader library loads
all objects in /system/etc/bpf/, parses and fixes up eBPF instructions
based on relocation information, creates maps and programs and pins
them. A single API call without arguments is made which results in this
operation. The API has all the information it needs from the filesystem
and the ELF objects, so there is no configuration stored in the code
calling the loader API essentially making it zero conf. Initially this
will be used by time_in_state statistics collection using tracepoints.
In the future, netd's eBPF C code should be rewritten to use this
infrastructure and the old ELF loader can be gotten rid off. This is the
first step.
* Link libbpf with libbpf_android which will come from the external/ bcc
project. This will be used for tracepoint and perf eBPF support. In the
future it can be used for other things as kernel eBPF support advances.
This patch will be merged only after bcc is cloned into external/ to
prevent build breakage.
Bug: 112334572
Change-Id: Ic0fd9504e18031132d40bb627c5e44058d59c9f8
Signed-off-by: Joel Fernandes <joelaf@google.com>
Maciej Żenczykowski
commited 
Connor O'Brien
authored and
Treehugger Robot
authored and
Gerrit Code Review
commited 
Steven Moreland
commited 
Joel Fernandes (Google)
authored and
Joel Fernandes
commited 
Christopher Ferris
commited 
Chenbo Feng
commited