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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __BPF_SCM__
#define __BPF_SCM__
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "utils.h"
#include "bpf_elf.h"
#define BPF_SCM_AUX_VER 1
#define BPF_SCM_MAX_FDS ELF_MAX_MAPS
#define BPF_SCM_MSG_SIZE 1024
struct bpf_elf_st {
dev_t st_dev;
ino_t st_ino;
};
struct bpf_map_aux {
unsigned short uds_ver;
unsigned short num_ent;
char obj_name[64];
struct bpf_elf_st obj_st;
struct bpf_elf_map ent[BPF_SCM_MAX_FDS];
};
struct bpf_map_set_msg {
struct msghdr hdr;
struct iovec iov;
char msg_buf[BPF_SCM_MSG_SIZE];
struct bpf_map_aux aux;
};
static inline int *bpf_map_set_init(struct bpf_map_set_msg *msg,
struct sockaddr_un *addr,
unsigned int addr_len)
{
const unsigned int cmsg_ctl_len = sizeof(int) * BPF_SCM_MAX_FDS;
struct cmsghdr *cmsg;
msg->iov.iov_base = &msg->aux;
msg->iov.iov_len = sizeof(msg->aux);
msg->hdr.msg_iov = &msg->iov;
msg->hdr.msg_iovlen = 1;
msg->hdr.msg_name = (struct sockaddr *)addr;
msg->hdr.msg_namelen = addr_len;
BUILD_BUG_ON(sizeof(msg->msg_buf) < cmsg_ctl_len);
msg->hdr.msg_control = &msg->msg_buf;
msg->hdr.msg_controllen = cmsg_ctl_len;
cmsg = CMSG_FIRSTHDR(&msg->hdr);
cmsg->cmsg_len = msg->hdr.msg_controllen;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
return (int *)CMSG_DATA(cmsg);
}
static inline void bpf_map_set_init_single(struct bpf_map_set_msg *msg,
int num)
{
struct cmsghdr *cmsg;
msg->hdr.msg_controllen = CMSG_LEN(sizeof(int) * num);
msg->iov.iov_len = offsetof(struct bpf_map_aux, ent) +
sizeof(struct bpf_elf_map) * num;
cmsg = CMSG_FIRSTHDR(&msg->hdr);
cmsg->cmsg_len = msg->hdr.msg_controllen;
}
#endif /* __BPF_SCM__ */
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