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authorAlexei Starovoitov <ast@plumgrid.com>2015-06-04 17:11:54 (GMT)
committerDavid S. Miller <davem@davemloft.net>2015-06-07 09:01:33 (GMT)
commitd691f9e8d4405c334aa10d556e73c8bf44cb0e01 (patch)
tree295b1d647364407c42990d916358a72381f4d534 /net/batman-adv/main.h
parent3431205e03977aaf32bce6d4b16fb8244b510056 (diff)
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/batman-adv/main.h')
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