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