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75 lines
1.6 KiB
75 lines
1.6 KiB
#ifndef __BPF_SCM__ |
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#define __BPF_SCM__ |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include "utils.h" |
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#include "bpf_elf.h" |
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#define BPF_SCM_AUX_VER 1 |
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#define BPF_SCM_MAX_FDS ELF_MAX_MAPS |
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#define BPF_SCM_MSG_SIZE 1024 |
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struct bpf_elf_st { |
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dev_t st_dev; |
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ino_t st_ino; |
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}; |
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struct bpf_map_aux { |
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unsigned short uds_ver; |
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unsigned short num_ent; |
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char obj_name[64]; |
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struct bpf_elf_st obj_st; |
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struct bpf_elf_map ent[BPF_SCM_MAX_FDS]; |
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}; |
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struct bpf_map_set_msg { |
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struct msghdr hdr; |
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struct iovec iov; |
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char msg_buf[BPF_SCM_MSG_SIZE]; |
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struct bpf_map_aux aux; |
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}; |
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static inline int *bpf_map_set_init(struct bpf_map_set_msg *msg, |
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struct sockaddr_un *addr, |
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unsigned int addr_len) |
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{ |
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const unsigned int cmsg_ctl_len = sizeof(int) * BPF_SCM_MAX_FDS; |
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struct cmsghdr *cmsg; |
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msg->iov.iov_base = &msg->aux; |
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msg->iov.iov_len = sizeof(msg->aux); |
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msg->hdr.msg_iov = &msg->iov; |
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msg->hdr.msg_iovlen = 1; |
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msg->hdr.msg_name = (struct sockaddr *)addr; |
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msg->hdr.msg_namelen = addr_len; |
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BUILD_BUG_ON(sizeof(msg->msg_buf) < cmsg_ctl_len); |
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msg->hdr.msg_control = &msg->msg_buf; |
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msg->hdr.msg_controllen = cmsg_ctl_len; |
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cmsg = CMSG_FIRSTHDR(&msg->hdr); |
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cmsg->cmsg_len = msg->hdr.msg_controllen; |
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cmsg->cmsg_level = SOL_SOCKET; |
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cmsg->cmsg_type = SCM_RIGHTS; |
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return (int *)CMSG_DATA(cmsg); |
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} |
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static inline void bpf_map_set_init_single(struct bpf_map_set_msg *msg, |
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int num) |
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{ |
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struct cmsghdr *cmsg; |
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msg->hdr.msg_controllen = CMSG_LEN(sizeof(int) * num); |
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msg->iov.iov_len = offsetof(struct bpf_map_aux, ent) + |
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sizeof(struct bpf_elf_map) * num; |
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cmsg = CMSG_FIRSTHDR(&msg->hdr); |
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cmsg->cmsg_len = msg->hdr.msg_controllen; |
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} |
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#endif /* __BPF_SCM__ */
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