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Date: Wed, 7 Jan 2015 17:47:24 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, jhs@...atatu.com, stephen@...workplumber.org
Subject: [patch iproute2 2/2] tc: add support for BPF based actions
Signed-off-by: Jiri Pirko <jiri@...nulli.us>
---
include/linux/tc_act/tc_bpf.h | 31 +++++++
tc/Makefile | 1 +
tc/m_bpf.c | 183 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 215 insertions(+)
create mode 100644 include/linux/tc_act/tc_bpf.h
create mode 100644 tc/m_bpf.c
diff --git a/include/linux/tc_act/tc_bpf.h b/include/linux/tc_act/tc_bpf.h
new file mode 100644
index 0000000..5288bd7
--- /dev/null
+++ b/include/linux/tc_act/tc_bpf.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2015 Jiri Pirko <jiri@...nulli.us>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __LINUX_TC_BPF_H
+#define __LINUX_TC_BPF_H
+
+#include <linux/pkt_cls.h>
+
+#define TCA_ACT_BPF 13
+
+struct tc_act_bpf {
+ tc_gen;
+};
+
+enum {
+ TCA_ACT_BPF_UNSPEC,
+ TCA_ACT_BPF_TM,
+ TCA_ACT_BPF_PARMS,
+ TCA_ACT_BPF_OPS_LEN,
+ TCA_ACT_BPF_OPS,
+ __TCA_ACT_BPF_MAX,
+};
+#define TCA_ACT_BPF_MAX (__TCA_ACT_BPF_MAX - 1)
+
+#endif
diff --git a/tc/Makefile b/tc/Makefile
index 45304a1..27506a6 100644
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -41,6 +41,7 @@ TCMODULES += m_skbedit.o
TCMODULES += m_csum.o
TCMODULES += m_simple.o
TCMODULES += m_vlan.o
+TCMODULES += m_bpf.o
TCMODULES += p_ip.o
TCMODULES += p_icmp.o
TCMODULES += p_tcp.o
diff --git a/tc/m_bpf.c b/tc/m_bpf.c
new file mode 100644
index 0000000..611135e
--- /dev/null
+++ b/tc/m_bpf.c
@@ -0,0 +1,183 @@
+/*
+ * m_bpf.c BFP based action module
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Authors: Jiri Pirko <jiri@...nulli.us>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdbool.h>
+#include <linux/tc_act/tc_bpf.h>
+
+#include "utils.h"
+#include "rt_names.h"
+#include "tc_util.h"
+#include "tc_bpf.h"
+
+static void explain(void)
+{
+ fprintf(stderr, "Usage: ... bpf ...\n");
+ fprintf(stderr, "\n");
+ fprintf(stderr, " [inline]: run bytecode BPF_BYTECODE\n");
+ fprintf(stderr, " [from file]: run bytecode-file FILE\n");
+ fprintf(stderr, "\n");
+ fprintf(stderr, "Where BPF_BYTECODE := \'s,c t f k,c t f k,c t f k,...\'\n");
+ fprintf(stderr, " c,t,f,k and s are decimals; s denotes number of 4-tuples\n");
+ fprintf(stderr, "Where FILE points to a file containing the BPF_BYTECODE string\n");
+ fprintf(stderr, "\nACTION_SPEC := ... look at individual actions\n");
+ fprintf(stderr, "NOTE: CLASSID is parsed as hexadecimal input.\n");
+}
+
+static void usage(void)
+{
+ explain();
+ exit(-1);
+}
+
+static int parse_bpf(struct action_util *a, int *argc_p, char ***argv_p,
+ int tca_id, struct nlmsghdr *n)
+{
+ int argc = *argc_p;
+ char **argv = *argv_p;
+ struct rtattr *tail;
+ struct tc_act_bpf parm = { 0 };
+ struct sock_filter bpf_ops[BPF_MAXINSNS];
+ __u16 bpf_len = 0;
+
+ if (matches(*argv, "bpf") != 0)
+ return -1;
+
+ NEXT_ARG();
+
+ while (argc > 0) {
+ if (matches(*argv, "run") == 0) {
+ bool from_file;
+ int ret;
+
+ NEXT_ARG();
+ if (strcmp(*argv, "bytecode-file") == 0) {
+ from_file = true;
+ } else if (strcmp(*argv, "bytecode") == 0) {
+ from_file = false;
+ } else {
+ fprintf(stderr, "unexpected \"%s\"\n", *argv);
+ explain();
+ return -1;
+ }
+ NEXT_ARG();
+ ret = bpf_parse_ops(argc, argv, bpf_ops, from_file);
+ if (ret < 0) {
+ fprintf(stderr, "Illegal \"bytecode\"\n");
+ return -1;
+ }
+ bpf_len = ret;
+ } else if (matches(*argv, "help") == 0) {
+ usage();
+ } else {
+ break;
+ }
+ argc--;
+ argv++;
+ }
+
+ parm.action = TC_ACT_PIPE;
+ if (argc) {
+ if (matches(*argv, "reclassify") == 0) {
+ parm.action = TC_ACT_RECLASSIFY;
+ NEXT_ARG();
+ } else if (matches(*argv, "pipe") == 0) {
+ parm.action = TC_ACT_PIPE;
+ NEXT_ARG();
+ } else if (matches(*argv, "drop") == 0 ||
+ matches(*argv, "shot") == 0) {
+ parm.action = TC_ACT_SHOT;
+ NEXT_ARG();
+ } else if (matches(*argv, "continue") == 0) {
+ parm.action = TC_ACT_UNSPEC;
+ NEXT_ARG();
+ } else if (matches(*argv, "pass") == 0) {
+ parm.action = TC_ACT_OK;
+ NEXT_ARG();
+ }
+ }
+
+ if (argc) {
+ if (matches(*argv, "index") == 0) {
+ NEXT_ARG();
+ if (get_u32(&parm.index, *argv, 10)) {
+ fprintf(stderr, "bpf: Illegal \"index\"\n");
+ return -1;
+ }
+ argc--;
+ argv++;
+ }
+ }
+
+ if (!bpf_len) {
+ 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));
+ 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));
+ tail->rta_len = (char *)NLMSG_TAIL(n) - (char *)tail;
+
+ *argc_p = argc;
+ *argv_p = argv;
+ return 0;
+}
+
+static int print_bpf(struct action_util *au, FILE *f, struct rtattr *arg)
+{
+ struct rtattr *tb[TCA_ACT_BPF_MAX + 1];
+ struct tc_act_bpf *parm;
+
+ if (arg == NULL)
+ return -1;
+
+ parse_rtattr_nested(tb, TCA_ACT_BPF_MAX, arg);
+
+ if (!tb[TCA_ACT_BPF_PARMS]) {
+ fprintf(f, "[NULL bpf parameters]");
+ return -1;
+ }
+ parm = RTA_DATA(tb[TCA_ACT_BPF_PARMS]);
+
+ fprintf(f, " bpf ");
+
+ if (tb[TCA_ACT_BPF_OPS] && tb[TCA_ACT_BPF_OPS_LEN])
+ bpf_print_ops(f, tb[TCA_ACT_BPF_OPS],
+ rta_getattr_u16(tb[TCA_ACT_BPF_OPS_LEN]));
+
+ fprintf(f, "\n\tindex %d ref %d bind %d", parm->index, parm->refcnt,
+ parm->bindcnt);
+
+ if (show_stats) {
+ if (tb[TCA_ACT_BPF_TM]) {
+ struct tcf_t *tm = RTA_DATA(tb[TCA_ACT_BPF_TM]);
+ print_tm(f, tm);
+ }
+ }
+
+ fprintf(f, "\n ");
+
+ return 0;
+}
+
+struct action_util bpf_action_util = {
+ .id = "bpf",
+ .parse_aopt = parse_bpf,
+ .print_aopt = print_bpf,
+};
--
1.9.3
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