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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 14:18:53 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 14:18:53 +0000 |
commit | a0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67 (patch) | |
tree | 8feaf1a1932871b139b3b30be4c09c66489918be /include/bpf_scm.h | |
parent | Initial commit. (diff) | |
download | iproute2-upstream/6.1.0.tar.xz iproute2-upstream/6.1.0.zip |
Adding upstream version 6.1.0.upstream/6.1.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | include/bpf_scm.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/include/bpf_scm.h b/include/bpf_scm.h new file mode 100644 index 0000000..669f053 --- /dev/null +++ b/include/bpf_scm.h @@ -0,0 +1,77 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __BPF_SCM__ +#define __BPF_SCM__ + +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/un.h> + +#include "utils.h" +#include "bpf_elf.h" + +#define BPF_SCM_AUX_VER 1 +#define BPF_SCM_MAX_FDS ELF_MAX_MAPS +#define BPF_SCM_MSG_SIZE 1024 + +struct bpf_elf_st { + dev_t st_dev; + ino_t st_ino; +}; + +struct bpf_map_aux { + unsigned short uds_ver; + unsigned short num_ent; + char obj_name[64]; + struct bpf_elf_st obj_st; + struct bpf_elf_map ent[BPF_SCM_MAX_FDS]; +}; + +struct bpf_map_set_msg { + struct msghdr hdr; + struct iovec iov; + char msg_buf[BPF_SCM_MSG_SIZE]; + struct bpf_map_aux aux; +}; + +static inline int *bpf_map_set_init(struct bpf_map_set_msg *msg, + struct sockaddr_un *addr, + unsigned int addr_len) +{ + const unsigned int cmsg_ctl_len = sizeof(int) * BPF_SCM_MAX_FDS; + struct cmsghdr *cmsg; + + msg->iov.iov_base = &msg->aux; + msg->iov.iov_len = sizeof(msg->aux); + + msg->hdr.msg_iov = &msg->iov; + msg->hdr.msg_iovlen = 1; + + msg->hdr.msg_name = (struct sockaddr *)addr; + msg->hdr.msg_namelen = addr_len; + + BUILD_BUG_ON(sizeof(msg->msg_buf) < cmsg_ctl_len); + msg->hdr.msg_control = &msg->msg_buf; + msg->hdr.msg_controllen = cmsg_ctl_len; + + cmsg = CMSG_FIRSTHDR(&msg->hdr); + cmsg->cmsg_len = msg->hdr.msg_controllen; + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + + return (int *)CMSG_DATA(cmsg); +} + +static inline void bpf_map_set_init_single(struct bpf_map_set_msg *msg, + int num) +{ + struct cmsghdr *cmsg; + + msg->hdr.msg_controllen = CMSG_LEN(sizeof(int) * num); + msg->iov.iov_len = offsetof(struct bpf_map_aux, ent) + + sizeof(struct bpf_elf_map) * num; + + cmsg = CMSG_FIRSTHDR(&msg->hdr); + cmsg->cmsg_len = msg->hdr.msg_controllen; +} + +#endif /* __BPF_SCM__ */ |