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