Re: [PATCH v5 bpf 0/4] lwt: fix return values of BPF ops

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Hi Yan,

On 8/16/23 4:54 AM, Yan Zhai wrote:
lwt xmit hook does not expect positive return values in function
ip_finish_output2 and ip6_finish_output. However, BPF programs can
directly return positive statuses such like NET_XMIT_DROP, NET_RX_DROP,
and etc to the caller. Such return values would make the kernel continue
processing already freed skbs and eventually panic.

This set fixes the return values from BPF ops to unexpected continue
processing, and checks strictly on the correct continue condition for
future proof. In addition, add missing selftests for BPF_REDIRECT
and BPF_REROUTE cases for BPF-CI.

v4: https://lore.kernel.org/bpf/ZMD1sFTW8SFiex+x@debian.debian/T/
v3: https://lore.kernel.org/bpf/cover.1690255889.git.yan@xxxxxxxxxxxxxx/
v2: https://lore.kernel.org/netdev/ZLdY6JkWRccunvu0@debian.debian/
v1: https://lore.kernel.org/bpf/ZLbYdpWC8zt9EJtq@debian.debian/

changes since v4:
  * fixed same error on BPF_REROUTE path
  * re-implemented selftests under BPF-CI requirement

BPF CI failed: https://github.com/kernel-patches/bpf/actions/runs/5874202507/job/15929012788

Looks like due to dummy device issue. Either you might need to add this to
the tools/testing/selftests/bpf/config* or perhaps just use veth instead for
link_err dev.

Error from the above link:

Notice: Success: 370/3177, Skipped: 21, Failed: 2
Error: #131 lwt_redirect
  Error: #131 lwt_redirect
  test_lwt_redirect:PASS:pthread_create 0 nsec
Error: #131/1 lwt_redirect/lwt_redirect_normal
  Error: #131/1 lwt_redirect/lwt_redirect_normal
  test_lwt_redirect_run:PASS:netns_create 0 nsec
  open_netns:PASS:malloc token 0 nsec
  open_netns:PASS:open /proc/self/ns/net 0 nsec
  open_netns:PASS:open netns fd 0 nsec
  open_netns:PASS:setns 0 nsec
  test_lwt_redirect_run:PASS:setns 0 nsec
  open_tuntap:PASS:open(/dev/net/tun) 0 nsec
  open_tuntap:PASS:ioctl(TUNSETIFF) 0 nsec
  open_tuntap:PASS:fcntl(O_NONBLOCK) 0 nsec
  setup_redirect_target:PASS:open_tuntap 0 nsec
  setup_redirect_target:PASS:if_nametoindex 0 nsec
  setup_redirect_target:FAIL:ip link add link_err type dummy unexpected error: 512 (errno 0)
  test_lwt_redirect_normal:FAIL:setup_redirect_target unexpected setup_redirect_target: actual -1 < expected 0
  close_netns:PASS:setns 0 nsec
Error: #131/2 lwt_redirect/lwt_redirect_normal_nomac
  Error: #131/2 lwt_redirect/lwt_redirect_normal_nomac
  test_lwt_redirect_run:PASS:netns_create 0 nsec
  open_netns:PASS:malloc token 0 nsec
  open_netns:PASS:open /proc/self/ns/net 0 nsec
  open_netns:PASS:open netns fd 0 nsec
  open_netns:PASS:setns 0 nsec
  test_lwt_redirect_run:PASS:setns 0 nsec
  open_tuntap:PASS:open(/dev/net/tun) 0 nsec
  open_tuntap:PASS:ioctl(TUNSETIFF) 0 nsec
  open_tuntap:PASS:fcntl(O_NONBLOCK) 0 nsec
  setup_redirect_target:PASS:open_tuntap 0 nsec
  setup_redirect_target:PASS:if_nametoindex 0 nsec
  setup_redirect_target:FAIL:ip link add link_err type dummy unexpected error: 512 (errno 0)
  test_lwt_redirect_normal_nomac:FAIL:setup_redirect_target unexpected setup_redirect_target: actual -1 < expected 0
  close_netns:PASS:setns 0 nsec
Error: #131/3 lwt_redirect/lwt_redirect_dev_down
  Error: #131/3 lwt_redirect/lwt_redirect_dev_down
  test_lwt_redirect_run:PASS:netns_create 0 nsec
  open_netns:PASS:malloc token 0 nsec
  open_netns:PASS:open /proc/self/ns/net 0 nsec
  open_netns:PASS:open netns fd 0 nsec
  open_netns:PASS:setns 0 nsec
  test_lwt_redirect_run:PASS:setns 0 nsec
  open_tuntap:PASS:open(/dev/net/tun) 0 nsec
  open_tuntap:PASS:ioctl(TUNSETIFF) 0 nsec
  open_tuntap:PASS:fcntl(O_NONBLOCK) 0 nsec
  setup_redirect_target:PASS:open_tuntap 0 nsec
  setup_redirect_target:PASS:if_nametoindex 0 nsec
  setup_redirect_target:FAIL:ip link add link_err type dummy unexpected error: 512 (errno 0)
  __test_lwt_redirect_dev_down:FAIL:setup_redirect_target unexpected setup_redirect_target: actual -1 < expected 0
  close_netns:PASS:setns 0 nsec
Error: #131/4 lwt_redirect/lwt_redirect_dev_down_nomac
  Error: #131/4 lwt_redirect/lwt_redirect_dev_down_nomac
  test_lwt_redirect_run:PASS:netns_create 0 nsec
  open_netns:PASS:malloc token 0 nsec
  open_netns:PASS:open /proc/self/ns/net 0 nsec
  open_netns:PASS:open netns fd 0 nsec
  open_netns:PASS:setns 0 nsec
  test_lwt_redirect_run:PASS:setns 0 nsec
  open_tuntap:PASS:open(/dev/net/tun) 0 nsec
  open_tuntap:PASS:ioctl(TUNSETIFF) 0 nsec
  open_tuntap:PASS:fcntl(O_NONBLOCK) 0 nsec
  setup_redirect_target:PASS:open_tuntap 0 nsec
  setup_redirect_target:PASS:if_nametoindex 0 nsec
  setup_redirect_target:FAIL:ip link add link_err type dummy unexpected error: 512 (errno 0)
  __test_lwt_redirect_dev_down:FAIL:setup_redirect_target unexpected setup_redirect_target: actual -1 < expected 0
  close_netns:PASS:setns 0 nsec
Error: #131/5 lwt_redirect/lwt_redirect_dev_carrier_down
  Error: #131/5 lwt_redirect/lwt_redirect_dev_carrier_down
  test_lwt_redirect_run:PASS:netns_create 0 nsec
  open_netns:PASS:malloc token 0 nsec
  open_netns:PASS:open /proc/self/ns/net 0 nsec
  open_netns:PASS:open netns fd 0 nsec
  open_netns:PASS:setns 0 nsec
  test_lwt_redirect_run:PASS:setns 0 nsec
  open_tuntap:PASS:open(/dev/net/tun) 0 nsec
  open_tuntap:PASS:ioctl(TUNSETIFF) 0 nsec
  open_tuntap:PASS:fcntl(O_NONBLOCK) 0 nsec
  setup_redirect_target:PASS:open_tuntap 0 nsec
  setup_redirect_target:PASS:if_nametoindex 0 nsec
  setup_redirect_target:FAIL:ip link add link_err type dummy unexpected error: 512 (errno 0)
  test_lwt_redirect_dev_carrier_down:FAIL:setup_redirect_target unexpected setup_redirect_target: actual -1 < expected 0
  close_netns:PASS:setns 0 nsec
  test_lwt_redirect:PASS:pthread_join 0 nsec
Error: #132 lwt_reroute
  Error: #132 lwt_reroute
  test_lwt_reroute:PASS:pthread_create 0 nsec
Error: #132/1 lwt_reroute/lwt_reroute_normal_xmit
  Error: #132/1 lwt_reroute/lwt_reroute_normal_xmit
  test_lwt_reroute_run:PASS:netns_create 0 nsec
  open_netns:PASS:malloc token 0 nsec
  open_netns:PASS:open /proc/self/ns/net 0 nsec
  open_netns:PASS:open netns fd 0 nsec
  open_netns:PASS:setns 0 nsec
  test_lwt_reroute_run:PASS:setns 0 nsec
  open_tuntap:PASS:open(/dev/net/tun) 0 nsec
  open_tuntap:PASS:ioctl(TUNSETIFF) 0 nsec
  open_tuntap:PASS:fcntl(O_NONBLOCK) 0 nsec
  setup:PASS:open_tun 0 nsec
  setup:PASS:if_nametoindex 0 nsec
  setup:FAIL:ip link add link_err type dummy unexpected error: 512 (errno 0)
  test_lwt_reroute_normal_xmit:FAIL:setup_reroute unexpected setup_reroute: actual -1 < expected 0
  close_netns:PASS:setns 0 nsec
Error: #132/2 lwt_reroute/lwt_reroute_qdisc_dropped
  Error: #132/2 lwt_reroute/lwt_reroute_qdisc_dropped
  test_lwt_reroute_run:PASS:netns_create 0 nsec
  open_netns:PASS:malloc token 0 nsec
  open_netns:PASS:open /proc/self/ns/net 0 nsec
  open_netns:PASS:open netns fd 0 nsec
  open_netns:PASS:setns 0 nsec
  test_lwt_reroute_run:PASS:setns 0 nsec
  open_tuntap:PASS:open(/dev/net/tun) 0 nsec
  open_tuntap:PASS:ioctl(TUNSETIFF) 0 nsec
  open_tuntap:PASS:fcntl(O_NONBLOCK) 0 nsec
  setup:PASS:open_tun 0 nsec
  setup:PASS:if_nametoindex 0 nsec
  setup:FAIL:ip link add link_err type dummy unexpected error: 512 (errno 0)
  test_lwt_reroute_qdisc_dropped:FAIL:setup_reroute unexpected setup_reroute: actual -1 < expected 0
  close_netns:PASS:setns 0 nsec
  test_lwt_reroute:PASS:pthread_join 0 nsec
Test Results:
             bpftool: PASS
          test_progs: FAIL (returned 1)
            shutdown: CLEAN
Error: Process completed with exit code 1.

Thanks,
Daniel



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