| /* 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__ */ |