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selftests/bpf: Add apply_bytes test to test_txmsg_redir_wait_sndmem in test_sockmap

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Add this to more comprehensively test the socket memory accounting logic
in the __SK_REDIRECT and __SK_DROP cases of tcp_bpf_sendmsg. We don't have
test when apply_bytes are not zero in test_txmsg_redir_wait_sndmem.
test_send_large has opt->rate=2, it will invoke sendmsg two times.

Specifically, the first sendmsg will trigger the case where the ret value
of tcp_bpf_sendmsg_redir is less than 0; while the second sendmsg happens
after the 3 seconds timeout, and it will trigger __SK_DROP because socket
c2 has been removed from the sockmap/hash.

Signed-off-by: Zijian Zhang <zijianzhang@bytedance.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20241016234838.3167769-2-zijianzhang@bytedance.com
This commit is contained in:
Zijian Zhang 2024-10-16 23:48:37 +00:00 committed by Daniel Borkmann
parent ca70b8baf2
commit 3448ad23b3
1 changed files with 5 additions and 1 deletions
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6
tools/testing/selftests/bpf/test_sockmap.c
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@ -1579,8 +1579,12 @@ static void test_txmsg_redir(int cgrp, struct sockmap_options *opt)
static void test_txmsg_redir_wait_sndmem(int cgrp, struct sockmap_options *opt)
{
txmsg_redir = 1;
opt->tx_wait_mem = true;
txmsg_redir = 1;
test_send_large(opt, cgrp);
txmsg_redir = 1;
txmsg_apply = 4097;
test_send_large(opt, cgrp);
opt->tx_wait_mem = false;
}