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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/m_bpf.c
parentInitial commit. (diff)
downloadiproute2-a0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67.tar.xz
iproute2-a0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67.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/m_bpf.c')
-rw-r--r--tc/m_bpf.c219
1 files changed, 219 insertions, 0 deletions
diff --git a/tc/m_bpf.c b/tc/m_bpf.c
new file mode 100644
index 0000000..af5ba5c
--- /dev/null
+++ b/tc/m_bpf.c
@@ -0,0 +1,219 @@
+/*
+ * m_bpf.c BPF 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@resnulli.us>
+ * Daniel Borkmann <daniel@iogearbox.net>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <linux/bpf.h>
+#include <linux/tc_act/tc_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_ACT;
+
+static void explain(void)
+{
+ fprintf(stderr,
+ "Usage: ... bpf ... [ index INDEX ]\n"
+ "\n"
+ "BPF use case:\n"
+ " bytecode BPF_BYTECODE\n"
+ " bytecode-file FILE\n"
+ "\n"
+ "eBPF use case:\n"
+ " object-file FILE [ section ACT_NAME ] [ export UDS_FILE ]"
+ " [ verbose ]\n"
+ " object-pinned FILE\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 ACT_NAME refers to the section name containing the\n"
+ "action (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"
+ "Where optionally INDEX points to an existing action, or\n"
+ "explicitly specifies an action index upon creation.\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_ACT_BPF_OPS_LEN, ops_len);
+ addattr_l(nl, MAX_MSG, TCA_ACT_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_ACT_BPF_FD, fd);
+ addattrstrz(nl, MAX_MSG, TCA_ACT_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 action_util *a, int *ptr_argc, char ***ptr_argv,
+ int tca_id, struct nlmsghdr *n)
+{
+ const char *bpf_obj = NULL, *bpf_uds_name = NULL;
+ struct tc_act_bpf parm = {};
+ struct bpf_cfg_in cfg = {};
+ bool seen_run = false;
+ struct rtattr *tail;
+ int argc, ret = 0;
+ char **argv;
+
+ argv = *ptr_argv;
+ argc = *ptr_argc;
+
+ if (matches(*argv, "bpf") != 0)
+ return -1;
+
+ NEXT_ARG();
+
+ tail = addattr_nest(n, MAX_MSG, tca_id);
+
+ 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_and_load_common(&cfg, &bpf_cb_ops, n))
+ return -1;
+
+ argc = cfg.argc;
+ argv = cfg.argv;
+
+ bpf_obj = cfg.object;
+ bpf_uds_name = cfg.uds;
+ } else if (matches(*argv, "help") == 0) {
+ explain();
+ return -1;
+ } else if (matches(*argv, "index") == 0) {
+ break;
+ } else {
+ if (!seen_run)
+ goto opt_bpf;
+ break;
+ }
+
+ NEXT_ARG_FWD();
+ }
+
+ parse_action_control_dflt(&argc, &argv, &parm.action,
+ false, TC_ACT_PIPE);
+
+ if (argc) {
+ if (matches(*argv, "index") == 0) {
+ NEXT_ARG();
+ if (get_u32(&parm.index, *argv, 10)) {
+ fprintf(stderr, "bpf: Illegal \"index\"\n");
+ return -1;
+ }
+
+ NEXT_ARG_FWD();
+ }
+ }
+
+ addattr_l(n, MAX_MSG, TCA_ACT_BPF_PARMS, &parm, sizeof(parm));
+ addattr_nest_end(n, tail);
+
+ if (bpf_uds_name)
+ ret = bpf_send_map_fds(bpf_uds_name, bpf_obj);
+
+ *ptr_argc = argc;
+ *ptr_argv = argv;
+
+ return ret;
+}
+
+static int bpf_print_opt(struct action_util *au, FILE *f, struct rtattr *arg)
+{
+ struct rtattr *tb[TCA_ACT_BPF_MAX + 1];
+ struct tc_act_bpf *parm;
+ int d_ok = 0;
+
+ print_string(PRINT_ANY, "kind", "%s ", "bpf");
+ if (arg == NULL)
+ return 0;
+
+ parse_rtattr_nested(tb, TCA_ACT_BPF_MAX, arg);
+
+ if (!tb[TCA_ACT_BPF_PARMS]) {
+ fprintf(stderr, "Missing bpf parameters\n");
+ return -1;
+ }
+
+ parm = RTA_DATA(tb[TCA_ACT_BPF_PARMS]);
+
+ if (tb[TCA_ACT_BPF_NAME])
+ print_string(PRINT_ANY, "bpf_name", "%s ",
+ rta_getattr_str(tb[TCA_ACT_BPF_NAME]));
+ if (tb[TCA_ACT_BPF_OPS] && tb[TCA_ACT_BPF_OPS_LEN]) {
+ bpf_print_ops(tb[TCA_ACT_BPF_OPS],
+ rta_getattr_u16(tb[TCA_ACT_BPF_OPS_LEN]));
+ print_string(PRINT_FP, NULL, "%s", " ");
+ }
+
+ if (tb[TCA_ACT_BPF_ID])
+ d_ok = bpf_dump_prog_info(f,
+ rta_getattr_u32(tb[TCA_ACT_BPF_ID]));
+ if (!d_ok && tb[TCA_ACT_BPF_TAG]) {
+ SPRINT_BUF(b);
+
+ print_string(PRINT_ANY, "tag", "tag %s ",
+ hexstring_n2a(RTA_DATA(tb[TCA_ACT_BPF_TAG]),
+ RTA_PAYLOAD(tb[TCA_ACT_BPF_TAG]),
+ b, sizeof(b)));
+ }
+
+ print_action_control(f, "default-action ", parm->action, _SL_);
+ print_uint(PRINT_ANY, "index", "\t index %u", parm->index);
+ print_int(PRINT_ANY, "ref", " ref %d", parm->refcnt);
+ print_int(PRINT_ANY, "bind", " bind %d", 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 = bpf_parse_opt,
+ .print_aopt = bpf_print_opt,
+};