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/***
This file is part of systemd.
Copyright 2016 Daniel Mack
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "alloc-util.h"
#include "bpf-program.h"
#include "fd-util.h"
#include "log.h"
#include "missing.h"
int bpf_program_new(uint32_t prog_type, BPFProgram **ret) {
_cleanup_(bpf_program_unrefp) BPFProgram *p = NULL;
p = new0(BPFProgram, 1);
if (!p)
return log_oom();
p->prog_type = prog_type;
p->kernel_fd = -1;
*ret = p;
p = NULL;
return 0;
}
BPFProgram *bpf_program_unref(BPFProgram *p) {
if (!p)
return NULL;
safe_close(p->kernel_fd);
free(p->instructions);
return mfree(p);
}
int bpf_program_add_instructions(BPFProgram *p, const struct bpf_insn *instructions, size_t count) {
assert(p);
if (!GREEDY_REALLOC(p->instructions, p->allocated, p->n_instructions + count))
return -ENOMEM;
memcpy(p->instructions + p->n_instructions, instructions, sizeof(struct bpf_insn) * count);
p->n_instructions += count;
return 0;
}
int bpf_program_load_kernel(BPFProgram *p, char *log_buf, size_t log_size) {
union bpf_attr attr;
assert(p);
if (p->kernel_fd >= 0)
return -EBUSY;
attr = (union bpf_attr) {
.prog_type = p->prog_type,
.insns = PTR_TO_UINT64(p->instructions),
.insn_cnt = p->n_instructions,
.license = PTR_TO_UINT64("GPL"),
.log_buf = PTR_TO_UINT64(log_buf),
.log_level = !!log_buf,
.log_size = log_size,
};
p->kernel_fd = bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
if (p->kernel_fd < 0)
return -errno;
return 0;
}
int bpf_program_cgroup_attach(BPFProgram *p, int type, const char *path, uint32_t flags) {
_cleanup_close_ int fd = -1;
union bpf_attr attr;
assert(p);
assert(type >= 0);
assert(path);
fd = open(path, O_DIRECTORY|O_RDONLY|O_CLOEXEC);
if (fd < 0)
return -errno;
attr = (union bpf_attr) {
.attach_type = type,
.target_fd = fd,
.attach_bpf_fd = p->kernel_fd,
.attach_flags = flags,
};
if (bpf(BPF_PROG_ATTACH, &attr, sizeof(attr)) < 0)
return -errno;
return 0;
}
int bpf_program_cgroup_detach(int type, const char *path) {
_cleanup_close_ int fd = -1;
union bpf_attr attr;
assert(path);
fd = open(path, O_DIRECTORY|O_RDONLY|O_CLOEXEC);
if (fd < 0)
return -errno;
attr = (union bpf_attr) {
.attach_type = type,
.target_fd = fd,
};
if (bpf(BPF_PROG_DETACH, &attr, sizeof(attr)) < 0)
return -errno;
return 0;
}
int bpf_map_new(enum bpf_map_type type, size_t key_size, size_t value_size, size_t max_entries, uint32_t flags) {
union bpf_attr attr = {
.map_type = type,
.key_size = key_size,
.value_size = value_size,
.max_entries = max_entries,
.map_flags = flags,
};
int fd;
fd = bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
if (fd < 0)
return -errno;
return fd;
}
int bpf_map_update_element(int fd, const void *key, void *value) {
union bpf_attr attr = {
.map_fd = fd,
.key = PTR_TO_UINT64(key),
.value = PTR_TO_UINT64(value),
};
if (bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)) < 0)
return -errno;
return 0;
}
int bpf_map_lookup_element(int fd, const void *key, void *value) {
union bpf_attr attr = {
.map_fd = fd,
.key = PTR_TO_UINT64(key),
.value = PTR_TO_UINT64(value),
};
if (bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)) < 0)
return -errno;
return 0;
}
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