summaryrefslogtreecommitdiffstats
path: root/tc/f_bpf.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 14:18:53 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 14:18:53 +0000
commita0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67 (patch)
tree8feaf1a1932871b139b3b30be4c09c66489918be /tc/f_bpf.c
parentInitial commit. (diff)
downloadiproute2-upstream.tar.xz
iproute2-upstream.zip
Adding upstream version 6.1.0.upstream/6.1.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tc/f_bpf.c')
-rw-r--r--tc/f_bpf.c270
1 files changed, 270 insertions, 0 deletions
diff --git a/tc/f_bpf.c b/tc/f_bpf.c
new file mode 100644
index 0000000..96e4576
--- /dev/null
+++ b/tc/f_bpf.c
@@ -0,0 +1,270 @@
+/*
+ * f_bpf.c BPF-based Classifier
+ *
+ * This program is free software; you can distribute 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: Daniel Borkmann <daniel@iogearbox.net>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <linux/bpf.h>
+
+#include "utils.h"
+
+#include "tc_util.h"
+#include "bpf_util.h"
+
+static const enum bpf_prog_type bpf_type = BPF_PROG_TYPE_SCHED_CLS;
+
+static void explain(void)
+{
+ fprintf(stderr,
+ "Usage: ... bpf ...\n"
+ "\n"
+ "BPF use case:\n"
+ " bytecode BPF_BYTECODE\n"
+ " bytecode-file FILE\n"
+ "\n"
+ "eBPF use case:\n"
+ " object-file FILE [ section CLS_NAME ] [ export UDS_FILE ]"
+ " [ verbose ] [ direct-action ] [ skip_hw | skip_sw ]\n"
+ " object-pinned FILE [ direct-action ] [ skip_hw | skip_sw ]\n"
+ "\n"
+ "Common remaining options:\n"
+ " [ action ACTION_SPEC ]\n"
+ " [ classid CLASSID ]\n"
+ "\n"
+ "Where BPF_BYTECODE := \'s,c t f k,c t f k,c t f k,...\'\n"
+ "c,t,f,k and s are decimals; s denotes number of 4-tuples\n"
+ "\n"
+ "Where FILE points to a file containing the BPF_BYTECODE string,\n"
+ "an ELF file containing eBPF map definitions and bytecode, or a\n"
+ "pinned eBPF program.\n"
+ "\n"
+ "Where CLS_NAME refers to the section name containing the\n"
+ "classifier (default \'%s\').\n"
+ "\n"
+ "Where UDS_FILE points to a unix domain socket file in order\n"
+ "to hand off control of all created eBPF maps to an agent.\n"
+ "\n"
+ "ACTION_SPEC := ... look at individual actions\n"
+ "NOTE: CLASSID is parsed as hexadecimal input.\n",
+ bpf_prog_to_default_section(bpf_type));
+}
+
+static void bpf_cbpf_cb(void *nl, const struct sock_filter *ops, int ops_len)
+{
+ addattr16(nl, MAX_MSG, TCA_BPF_OPS_LEN, ops_len);
+ addattr_l(nl, MAX_MSG, TCA_BPF_OPS, ops,
+ ops_len * sizeof(struct sock_filter));
+}
+
+static void bpf_ebpf_cb(void *nl, int fd, const char *annotation)
+{
+ addattr32(nl, MAX_MSG, TCA_BPF_FD, fd);
+ addattrstrz(nl, MAX_MSG, TCA_BPF_NAME, annotation);
+}
+
+static const struct bpf_cfg_ops bpf_cb_ops = {
+ .cbpf_cb = bpf_cbpf_cb,
+ .ebpf_cb = bpf_ebpf_cb,
+};
+
+static int bpf_parse_opt(struct filter_util *qu, char *handle,
+ int argc, char **argv, struct nlmsghdr *n)
+{
+ const char *bpf_obj = NULL, *bpf_uds_name = NULL;
+ struct tcmsg *t = NLMSG_DATA(n);
+ unsigned int bpf_gen_flags = 0;
+ unsigned int bpf_flags = 0;
+ struct bpf_cfg_in cfg = {};
+ bool seen_run = false;
+ bool skip_sw = false;
+ struct rtattr *tail;
+ int ret = 0;
+
+ if (handle) {
+ if (get_u32(&t->tcm_handle, handle, 0)) {
+ fprintf(stderr, "Illegal \"handle\"\n");
+ return -1;
+ }
+ }
+
+ if (argc == 0)
+ return 0;
+
+ tail = (struct rtattr *)(((void *)n) + NLMSG_ALIGN(n->nlmsg_len));
+ addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
+
+ while (argc > 0) {
+ if (matches(*argv, "run") == 0) {
+ NEXT_ARG();
+
+ if (seen_run)
+ duparg("run", *argv);
+opt_bpf:
+ seen_run = true;
+ cfg.type = bpf_type;
+ cfg.argc = argc;
+ cfg.argv = argv;
+
+ if (bpf_parse_common(&cfg, &bpf_cb_ops) < 0) {
+ fprintf(stderr,
+ "Unable to parse bpf command line\n");
+ return -1;
+ }
+
+ argc = cfg.argc;
+ argv = cfg.argv;
+
+ bpf_obj = cfg.object;
+ bpf_uds_name = cfg.uds;
+ } else if (matches(*argv, "classid") == 0 ||
+ matches(*argv, "flowid") == 0) {
+ unsigned int classid;
+
+ NEXT_ARG();
+ if (get_tc_classid(&classid, *argv)) {
+ fprintf(stderr, "Illegal \"classid\"\n");
+ return -1;
+ }
+ addattr32(n, MAX_MSG, TCA_BPF_CLASSID, classid);
+ } else if (matches(*argv, "direct-action") == 0 ||
+ matches(*argv, "da") == 0) {
+ bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT;
+ } else if (matches(*argv, "skip_hw") == 0) {
+ bpf_gen_flags |= TCA_CLS_FLAGS_SKIP_HW;
+ } else if (matches(*argv, "skip_sw") == 0) {
+ bpf_gen_flags |= TCA_CLS_FLAGS_SKIP_SW;
+ skip_sw = true;
+ } else if (matches(*argv, "action") == 0) {
+ NEXT_ARG();
+ if (parse_action(&argc, &argv, TCA_BPF_ACT, n)) {
+ fprintf(stderr, "Illegal \"action\"\n");
+ return -1;
+ }
+ continue;
+ } else if (matches(*argv, "police") == 0) {
+ NEXT_ARG();
+ if (parse_police(&argc, &argv, TCA_BPF_POLICE, n)) {
+ fprintf(stderr, "Illegal \"police\"\n");
+ return -1;
+ }
+ continue;
+ } else if (matches(*argv, "help") == 0) {
+ explain();
+ return -1;
+ } else {
+ if (!seen_run)
+ goto opt_bpf;
+
+ fprintf(stderr, "What is \"%s\"?\n", *argv);
+ explain();
+ return -1;
+ }
+
+ NEXT_ARG_FWD();
+ }
+
+ if (skip_sw)
+ cfg.ifindex = t->tcm_ifindex;
+ if (bpf_load_common(&cfg, &bpf_cb_ops, n) < 0) {
+ fprintf(stderr, "Unable to load program\n");
+ return -1;
+ }
+
+ if (bpf_gen_flags)
+ addattr32(n, MAX_MSG, TCA_BPF_FLAGS_GEN, bpf_gen_flags);
+ if (bpf_flags)
+ addattr32(n, MAX_MSG, TCA_BPF_FLAGS, bpf_flags);
+
+ tail->rta_len = (((void *)n) + n->nlmsg_len) - (void *)tail;
+
+ if (bpf_uds_name)
+ ret = bpf_send_map_fds(bpf_uds_name, bpf_obj);
+
+ return ret;
+}
+
+static int bpf_print_opt(struct filter_util *qu, FILE *f,
+ struct rtattr *opt, __u32 handle)
+{
+ struct rtattr *tb[TCA_BPF_MAX + 1];
+ int dump_ok = 0;
+
+ if (opt == NULL)
+ return 0;
+
+ parse_rtattr_nested(tb, TCA_BPF_MAX, opt);
+
+ if (handle)
+ print_0xhex(PRINT_ANY, "handle", "handle %#llx ", handle);
+
+ if (tb[TCA_BPF_CLASSID]) {
+ SPRINT_BUF(b1);
+ print_string(PRINT_ANY, "flowid", "flowid %s ",
+ sprint_tc_classid(rta_getattr_u32(tb[TCA_BPF_CLASSID]), b1));
+ }
+
+ if (tb[TCA_BPF_NAME])
+ print_string(PRINT_ANY, "bpf_name", "%s ",
+ rta_getattr_str(tb[TCA_BPF_NAME]));
+
+ if (tb[TCA_BPF_FLAGS]) {
+ unsigned int flags = rta_getattr_u32(tb[TCA_BPF_FLAGS]);
+
+ if (flags & TCA_BPF_FLAG_ACT_DIRECT)
+ print_bool(PRINT_ANY,
+ "direct-action", "direct-action ", true);
+ }
+
+ if (tb[TCA_BPF_FLAGS_GEN]) {
+ unsigned int flags =
+ rta_getattr_u32(tb[TCA_BPF_FLAGS_GEN]);
+
+ if (flags & TCA_CLS_FLAGS_SKIP_HW)
+ print_bool(PRINT_ANY, "skip_hw", "skip_hw ", true);
+ if (flags & TCA_CLS_FLAGS_SKIP_SW)
+ print_bool(PRINT_ANY, "skip_sw", "skip_sw ", true);
+ if (flags & TCA_CLS_FLAGS_IN_HW)
+ print_bool(PRINT_ANY, "in_hw", "in_hw ", true);
+ else if (flags & TCA_CLS_FLAGS_NOT_IN_HW)
+ print_bool(PRINT_ANY,
+ "not_in_hw", "not_in_hw ", true);
+ }
+
+ if (tb[TCA_BPF_OPS] && tb[TCA_BPF_OPS_LEN])
+ bpf_print_ops(tb[TCA_BPF_OPS],
+ rta_getattr_u16(tb[TCA_BPF_OPS_LEN]));
+
+ if (tb[TCA_BPF_ID])
+ dump_ok = bpf_dump_prog_info(f, rta_getattr_u32(tb[TCA_BPF_ID]));
+ if (!dump_ok && tb[TCA_BPF_TAG]) {
+ SPRINT_BUF(b);
+
+ print_string(PRINT_ANY, "tag", "tag %s ",
+ hexstring_n2a(RTA_DATA(tb[TCA_BPF_TAG]),
+ RTA_PAYLOAD(tb[TCA_BPF_TAG]), b, sizeof(b)));
+ }
+
+ if (tb[TCA_BPF_POLICE]) {
+ print_nl();
+ tc_print_police(f, tb[TCA_BPF_POLICE]);
+ }
+
+ if (tb[TCA_BPF_ACT])
+ tc_print_action(f, tb[TCA_BPF_ACT], 0);
+
+ return 0;
+}
+
+struct filter_util bpf_filter_util = {
+ .id = "bpf",
+ .parse_fopt = bpf_parse_opt,
+ .print_fopt = bpf_print_opt,
+};