#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 <sys/un.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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