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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2021 Felix Fietkau <nbd@nbd.name>
*/
#include <sys/resource.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <glob.h>
#include <unistd.h>
#include "qosify.h"
static struct {
const char *suffix;
uint32_t flags;
int fd;
} bpf_progs[] = {
{ "egress_eth", 0 },
{ "egress_ip", QOSIFY_IP_ONLY },
{ "ingress_eth", QOSIFY_INGRESS },
{ "ingress_ip", QOSIFY_INGRESS | QOSIFY_IP_ONLY },
};
static int qosify_bpf_pr(enum libbpf_print_level level, const char *format,
va_list args)
{
return vfprintf(stderr, format, args);
}
static void qosify_init_env(void)
{
struct rlimit limit = {
.rlim_cur = RLIM_INFINITY,
.rlim_max = RLIM_INFINITY,
};
setrlimit(RLIMIT_MEMLOCK, &limit);
}
static void qosify_fill_rodata(struct bpf_object *obj, uint32_t flags)
{
struct bpf_map *map = NULL;
while ((map = bpf_object__next_map(obj, map)) != NULL) {
if (!strstr(bpf_map__name(map), ".rodata"))
continue;
bpf_map__set_initial_value(map, &flags, sizeof(flags));
}
}
const char *qosify_get_program(uint32_t flags, int *fd)
{
int i;
for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) {
if (bpf_progs[i].flags != flags)
continue;
*fd = bpf_progs[i].fd;
return bpf_progs[i].suffix;
}
return NULL;
}
static int
qosify_create_program(int idx)
{
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
.pin_root_path = CLASSIFY_DATA_PATH,
);
struct bpf_program *prog;
struct bpf_object *obj;
char path[256];
int err;
snprintf(path, sizeof(path), CLASSIFY_PIN_PATH "_" "%s", bpf_progs[idx].suffix);
obj = bpf_object__open_file(CLASSIFY_PROG_PATH, &opts);
err = libbpf_get_error(obj);
if (err) {
perror("bpf_object__open_file");
return -1;
}
prog = bpf_object__find_program_by_name(obj, "classify");
if (!prog) {
fprintf(stderr, "Can't find classifier prog\n");
return -1;
}
bpf_program__set_type(prog, BPF_PROG_TYPE_SCHED_CLS);
qosify_fill_rodata(obj, bpf_progs[idx].flags);
err = bpf_object__load(obj);
if (err) {
perror("bpf_object__load");
return -1;
}
libbpf_set_print(NULL);
unlink(path);
err = bpf_program__pin(prog, path);
if (err) {
fprintf(stderr, "Failed to pin program to %s: %s\n",
path, strerror(-err));
return -1;
}
bpf_object__close(obj);
err = bpf_obj_get(path);
if (err < 0) {
fprintf(stderr, "Failed to load pinned program %s: %s\n",
path, strerror(errno));
}
bpf_progs[idx].fd = err;
return 0;
}
int qosify_loader_init(void)
{
glob_t g;
int i;
if (glob(CLASSIFY_DATA_PATH "/*", 0, NULL, &g) == 0) {
for (i = 0; i < g.gl_pathc; i++)
unlink(g.gl_pathv[i]);
}
libbpf_set_print(qosify_bpf_pr);
qosify_init_env();
for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) {
if (qosify_create_program(i))
return -1;
}
return 0;
}
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