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| author |   Alexei Starovoitov <ast@plumgrid.com> | 2015-06-04 10:11:54 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-06-07 02:01:33 -0700 |
| commit | d691f9e8d4405c334aa10d556e73c8bf44cb0e01 (patch) | |
| tree | 295b1d647364407c42990d916358a72381f4d534 /net/unix/af_unix.c | |
| parent | bpf: make programs see skb->data == L2 for ingress and egress (diff) | |
| download | wireguard-linux-d691f9e8d4405c334aa10d556e73c8bf44cb0e01.tar.xz wireguard-linux-d691f9e8d4405c334aa10d556e73c8bf44cb0e01.zip | |
bpf: allow programs to write to certain skb fields
allow programs read/write skb->mark, tc_index fields and
((struct qdisc_skb_cb *)cb)->data.
mark and tc_index are generically useful in TC.
cb[0]-cb[4] are primarily used to pass arguments from one
program to another called via bpf_tail_call() which can
be seen in sockex3_kern.c example.
All fields of 'struct __sk_buff' are readable to socket and tc_cls_act progs.
mark, tc_index are writeable from tc_cls_act only.
cb[0]-cb[4] are writeable by both sockets and tc_cls_act.
Add verifier tests and improve sample code.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/unix/af_unix.c')
0 files changed, 0 insertions, 0 deletions