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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__ */ |