projects / mirror_iproute2.git / blame
| Commit | Line | Data |
|---|---|---|
| 6054c1eb | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 6256f8c9 DB |
2 | #ifndef __BPF_SCM__ |
| 3 | #define __BPF_SCM__ | |
| 4 | ||
| 5 | #include <sys/types.h> | |
| 6 | #include <sys/socket.h> | |
| 05b3b344 | 7 | #include <sys/un.h> |
| 6256f8c9 DB |
8 | |
| 9 | #include "utils.h" | |
| 10 | #include "bpf_elf.h" | |
| 11 | ||
| 12 | #define BPF_SCM_AUX_VER 1 | |
| 13 | #define BPF_SCM_MAX_FDS ELF_MAX_MAPS | |
| 14 | #define BPF_SCM_MSG_SIZE 1024 | |
| 15 | ||
| 16 | struct bpf_elf_st { | |
| 17 | dev_t st_dev; | |
| 18 | ino_t st_ino; | |
| 19 | }; | |
| 20 | ||
| 21 | struct bpf_map_aux { | |
| 22 | unsigned short uds_ver; | |
| 23 | unsigned short num_ent; | |
| 24 | char obj_name[64]; | |
| 25 | struct bpf_elf_st obj_st; | |
| 26 | struct bpf_elf_map ent[BPF_SCM_MAX_FDS]; | |
| 27 | }; | |
| 28 | ||
| 29 | struct bpf_map_set_msg { | |
| 30 | struct msghdr hdr; | |
| 31 | struct iovec iov; | |
| 32 | char msg_buf[BPF_SCM_MSG_SIZE]; | |
| 33 | struct bpf_map_aux aux; | |
| 34 | }; | |
| 35 | ||
| 36 | static inline int *bpf_map_set_init(struct bpf_map_set_msg *msg, | |
| 37 | struct sockaddr_un *addr, | |
| 38 | unsigned int addr_len) | |
| 39 | { | |
| 40 | const unsigned int cmsg_ctl_len = sizeof(int) * BPF_SCM_MAX_FDS; | |
| 41 | struct cmsghdr *cmsg; | |
| 42 | ||
| 43 | msg->iov.iov_base = &msg->aux; | |
| 44 | msg->iov.iov_len = sizeof(msg->aux); | |
| 45 | ||
| 46 | msg->hdr.msg_iov = &msg->iov; | |
| 47 | msg->hdr.msg_iovlen = 1; | |
| 48 | ||
| 49 | msg->hdr.msg_name = (struct sockaddr *)addr; | |
| 50 | msg->hdr.msg_namelen = addr_len; | |
| 51 | ||
| 52 | BUILD_BUG_ON(sizeof(msg->msg_buf) < cmsg_ctl_len); | |
| 53 | msg->hdr.msg_control = &msg->msg_buf; | |
| 54 | msg->hdr.msg_controllen = cmsg_ctl_len; | |
| 55 | ||
| 56 | cmsg = CMSG_FIRSTHDR(&msg->hdr); | |
| 57 | cmsg->cmsg_len = msg->hdr.msg_controllen; | |
| 58 | cmsg->cmsg_level = SOL_SOCKET; | |
| 59 | cmsg->cmsg_type = SCM_RIGHTS; | |
| 60 | ||
| 61 | return (int *)CMSG_DATA(cmsg); | |
| 62 | } | |
| 63 | ||
| 64 | static inline void bpf_map_set_init_single(struct bpf_map_set_msg *msg, | |
| 65 | int num) | |
| 66 | { | |
| 67 | struct cmsghdr *cmsg; | |
| 68 | ||
| 69 | msg->hdr.msg_controllen = CMSG_LEN(sizeof(int) * num); | |
| 70 | msg->iov.iov_len = offsetof(struct bpf_map_aux, ent) + | |
| 71 | sizeof(struct bpf_elf_map) * num; | |
| 72 | ||
| 73 | cmsg = CMSG_FIRSTHDR(&msg->hdr); | |
| 74 | cmsg->cmsg_len = msg->hdr.msg_controllen; | |
| 75 | } | |
| 76 | ||
| 77 | #endif /* __BPF_SCM__ */ |