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m_bpf: add frontend support for late binding 

Frontend support for kernel commit a5c90b29e5cc ("act_bpf: properly
support late binding of bpf action to a classifier").

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Daniel Borkmann 2015-08-07 11:36:50 +02:00 committed by Stephen Hemminger
parent 089d93d6f2
commit baed90842a
1 changed files with 11 additions and 9 deletions
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20
tc/m_bpf.c
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@ -28,7 +28,7 @@ static const enum bpf_prog_type bpf_type = BPF_PROG_TYPE_SCHED_ACT;
static void explain(void)
{
fprintf(stderr, "Usage: ... bpf ...\n");
fprintf(stderr, "Usage: ... bpf ... [ index INDEX ]\n");
fprintf(stderr, "\n");
fprintf(stderr, "BPF use case:\n");
fprintf(stderr, " bytecode BPF_BYTECODE\n");
@ -49,6 +49,9 @@ static void explain(void)
fprintf(stderr, "\n");
fprintf(stderr, "Where UDS_FILE points to a unix domain socket file in order\n");
fprintf(stderr, "to hand off control of all created eBPF maps to an agent.\n");
fprintf(stderr, "\n");
fprintf(stderr, "Where optionally INDEX points to an existing action, or\n");
fprintf(stderr, "explicitly specifies an action index upon creation.\n");
}
static void usage(void)
@ -64,6 +67,7 @@ static int parse_bpf(struct action_util *a, int *argc_p, char ***argv_p,
struct rtattr *tail;
struct tc_act_bpf parm = { 0 };
struct sock_filter bpf_ops[BPF_MAXINSNS];
bool ebpf_fill = false, bpf_fill = false;
bool ebpf = false, seen_run = false;
const char *bpf_uds_name = NULL;
const char *bpf_sec_name = NULL;
@ -148,11 +152,15 @@ opt_bpf:
bpf_obj, bpf_sec_name);
bpf_fd = ret;
ebpf_fill = true;
} else {
bpf_len = ret;
bpf_fill = true;
}
} else if (matches(*argv, "help") == 0) {
usage();
} else if (matches(*argv, "index") == 0) {
break;
} else {
if (!seen_run)
goto opt_bpf;
@ -200,21 +208,15 @@ opt_bpf:
}
}
if ((!bpf_len && !ebpf) || (!bpf_fd && ebpf)) {
fprintf(stderr, "bpf: Bytecode needs to be passed\n");
explain();
return -1;
}
tail = NLMSG_TAIL(n);
addattr_l(n, MAX_MSG, tca_id, NULL, 0);
addattr_l(n, MAX_MSG, TCA_ACT_BPF_PARMS, &parm, sizeof(parm));
if (ebpf) {
if (ebpf_fill) {
addattr32(n, MAX_MSG, TCA_ACT_BPF_FD, bpf_fd);
addattrstrz(n, MAX_MSG, TCA_ACT_BPF_NAME, bpf_name);
} else {
} else if (bpf_fill) {
addattr16(n, MAX_MSG, TCA_ACT_BPF_OPS_LEN, bpf_len);
addattr_l(n, MAX_MSG, TCA_ACT_BPF_OPS, &bpf_ops,
bpf_len * sizeof(struct sock_filter));