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sys/netlink/netlink_domain.c
- This file was added.
| /*- | |||||
| * SPDX-License-Identifier: BSD-2-Clause-FreeBSD | |||||
| * | |||||
| * Copyright (c) 2021 Ng Peng Nam Sean | |||||
Lint: Possible Spelling Mistake: Possible spelling error. You wrote 'nam', but did you mean 'name'? | |||||
| * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org> | |||||
| * | |||||
| * Redistribution and use in source and binary forms, with or without | |||||
| * modification, are permitted provided that the following conditions | |||||
| * are met: | |||||
| * 1. Redistributions of source code must retain the above copyright | |||||
| * notice, this list of conditions and the following disclaimer. | |||||
| * 2. Redistributions in binary form must reproduce the above copyright | |||||
| * notice, this list of conditions and the following disclaimer in the | |||||
| * documentation and/or other materials provided with the distribution. | |||||
| * | |||||
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
| * SUCH DAMAGE. | |||||
| */ | |||||
| /* | |||||
| * This file contains socket and protocol bindings for netlink. | |||||
| */ | |||||
| #include <sys/param.h> | |||||
| #include <sys/malloc.h> | |||||
| #include <sys/lock.h> | |||||
| #include <sys/rmlock.h> | |||||
| #include <sys/domain.h> | |||||
| #include <sys/mbuf.h> | |||||
| #include <sys/protosw.h> | |||||
| #include <sys/ck.h> | |||||
| #include <sys/socket.h> | |||||
| #include <sys/socketvar.h> | |||||
| #include <sys/sysent.h> | |||||
| #include <sys/syslog.h> | |||||
| #include <sys/priv.h> /* priv_check */ | |||||
| #include <netlink/netlink.h> | |||||
| #include <netlink/netlink_ctl.h> | |||||
| #include <netlink/netlink_var.h> | |||||
| #define DEBUG_MOD_NAME nl_domain | |||||
| #define DEBUG_MAX_LEVEL LOG_DEBUG3 | |||||
| #include <netlink/netlink_debug.h> | |||||
| _DECLARE_DEBUG(LOG_DEBUG); | |||||
| #define NLCTL_TRACKER struct rm_priotracker nl_tracker | |||||
| #define NLCTL_RLOCK(_ctl) rm_rlock(&((_ctl)->ctl_lock), &nl_tracker) | |||||
| #define NLCTL_RUNLOCK(_ctl) rm_runlock(&((_ctl)->ctl_lock), &nl_tracker) | |||||
| #define NLCTL_WLOCK(_ctl) rm_wlock(&((_ctl)->ctl_lock)) | |||||
| #define NLCTL_WUNLOCK(_ctl) rm_wunlock(&((_ctl)->ctl_lock)) | |||||
| static u_long nl_sendspace = NLSNDQ; | |||||
| SYSCTL_ULONG(_net_netlink, OID_AUTO, sendspace, CTLFLAG_RW, &nl_sendspace, 0, | |||||
| "Default netlink socket send space"); | |||||
| static u_long nl_recvspace = NLSNDQ; | |||||
| SYSCTL_ULONG(_net_netlink, OID_AUTO, recvspace, CTLFLAG_RW, &nl_recvspace, 0, | |||||
| "Default netlink socket receive space"); | |||||
| extern u_long sb_max_adj; | |||||
| static u_long nl_maxsockbuf = 512 * 1024 * 1024; /* 512M, XXX: init based on physmem */ | |||||
| uint32_t | |||||
| nlp_get_pid(const struct nlpcb *nlp) | |||||
| { | |||||
| return (nlp->nl_process_id); | |||||
| } | |||||
| /* | |||||
| * Looks up a nlpcb struct based on the @portid. Need to claim nlsock_mtx. | |||||
| * Returns nlpcb pointer if present else NULL | |||||
| */ | |||||
| static struct nlpcb * | |||||
| nl_port_lookup(uint32_t port_id) | |||||
| { | |||||
| struct nlpcb *nlp; | |||||
| CK_LIST_FOREACH(nlp, &V_nl_ctl->ctl_port_head, nl_port_next) { | |||||
| if (nlp->nl_port == port_id) | |||||
| return (nlp); | |||||
| } | |||||
| return (NULL); | |||||
| } | |||||
| static void | |||||
| nl_update_groups_locked(struct nlpcb *nlp, uint64_t nl_groups) | |||||
| { | |||||
| /* Update group mask */ | |||||
| NL_LOG(LOG_DEBUG2, "socket %p, groups 0x%lX -> 0x%lX", | |||||
| nlp->nl_socket, nlp->nl_groups, nl_groups); | |||||
| nlp->nl_groups = nl_groups; | |||||
| } | |||||
| /* | |||||
| * Broadcasts message @m to the protocol @proto group specified by @group_id | |||||
| */ | |||||
| void | |||||
| nl_send_group(struct mbuf *m, int num_messages, int proto, int group_id) | |||||
| { | |||||
| struct nlpcb *nlp_last = NULL; | |||||
| struct nlpcb *nlp; | |||||
| NLCTL_TRACKER; | |||||
| IF_DEBUG_LEVEL(LOG_DEBUG2) { | |||||
| struct nlmsghdr *hdr = mtod(m, struct nlmsghdr *); | |||||
| NL_LOG(LOG_DEBUG2, "MCAST mbuf len %u msg type %d len %u to group %d/%d", | |||||
| m->m_len, hdr->nlmsg_type, hdr->nlmsg_len, proto, group_id); | |||||
| } | |||||
| struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); | |||||
| if (__predict_false(ctl == NULL)) { | |||||
| /* | |||||
| * Can be the case when notification is sent within VNET | |||||
| * which doesn't have any netlink sockets. | |||||
| */ | |||||
| m_freem(m); | |||||
| return; | |||||
| } | |||||
| NLCTL_RLOCK(ctl); | |||||
| int io_flags = NL_IOF_UNTRANSLATED; | |||||
| uint64_t groups_mask = 1 << ((uint64_t)group_id - 1); | |||||
| CK_LIST_FOREACH(nlp, &ctl->ctl_pcb_head, nl_next) { | |||||
| if (nlp->nl_groups & groups_mask && nlp->nl_proto == proto) { | |||||
| if (nlp_last != NULL) { | |||||
| struct mbuf *m_copy; | |||||
| m_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT); | |||||
| if (m_copy != NULL) | |||||
| nl_send_one(m_copy, nlp_last, num_messages, io_flags); | |||||
| else { | |||||
| NLP_LOCK(nlp_last); | |||||
| if (nlp_last->nl_socket != NULL) | |||||
| sorwakeup(nlp_last->nl_socket); | |||||
| NLP_UNLOCK(nlp_last); | |||||
| } | |||||
| } | |||||
| nlp_last = nlp; | |||||
| } | |||||
| } | |||||
| if (nlp_last != NULL) | |||||
| nl_send_one(m, nlp_last, num_messages, io_flags); | |||||
| else | |||||
| m_freem(m); | |||||
| NLCTL_RUNLOCK(ctl); | |||||
| } | |||||
| bool | |||||
| nl_has_listeners(int netlink_family, uint32_t groups_mask) | |||||
| { | |||||
| return (V_nl_ctl != NULL); | |||||
| } | |||||
| bool | |||||
| nlp_has_priv(struct nlpcb *nlp, int priv) | |||||
| { | |||||
| return (priv_check_cred(nlp->nl_cred, priv) == 0); | |||||
| } | |||||
| static uint32_t | |||||
| nl_find_port() { | |||||
| /* | |||||
| * app can open multiple netlink sockets. | |||||
| * Start with current pid, if already taken, | |||||
| * try random numbers in 65k..256k+65k space, | |||||
| * avoiding clash with pids. | |||||
| */ | |||||
| if (nl_port_lookup(curproc->p_pid) == NULL) | |||||
| return (curproc->p_pid); | |||||
| for (int i = 0; i < 16; i++) { | |||||
| uint32_t nl_port = (arc4random() % 65536) + 65536 * 4; | |||||
| if (nl_port_lookup(nl_port) == 0) | |||||
| return (nl_port); | |||||
| NL_LOG(LOG_DEBUG3, "tried %u\n", nl_port); | |||||
| } | |||||
| return (curproc->p_pid); | |||||
| } | |||||
| static int | |||||
| nl_bind_locked(struct nlpcb *nlp, struct sockaddr_nl *snl) | |||||
| { | |||||
| if (nlp->nl_bound) { | |||||
| if (nlp->nl_port != snl->nl_pid) { | |||||
| NL_LOG(LOG_DEBUG, | |||||
| "bind() failed: program pid %d " | |||||
| "is different from provided pid %d", | |||||
| nlp->nl_port, snl->nl_pid); | |||||
| return (EINVAL); // XXX: better error | |||||
| } | |||||
| } else { | |||||
| if (snl->nl_pid == 0) | |||||
| snl->nl_pid = nl_find_port(); | |||||
| if (nl_port_lookup(snl->nl_pid) != NULL) | |||||
| return (EADDRINUSE); | |||||
| nlp->nl_port = snl->nl_pid; | |||||
| nlp->nl_bound = true; | |||||
| CK_LIST_INSERT_HEAD(&V_nl_ctl->ctl_port_head, nlp, nl_port_next); | |||||
| } | |||||
| nl_update_groups_locked(nlp, snl->nl_groups); | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| nl_pru_attach(struct socket *so, int proto, struct thread *td) | |||||
| { | |||||
| struct nlpcb *nlp; | |||||
| int error; | |||||
| if (__predict_false(netlink_unloading != 0)) | |||||
| return (EAFNOSUPPORT); | |||||
| error = nl_verify_proto(proto); | |||||
| if (error != 0) | |||||
| return (error); | |||||
| bool is_linux = SV_PROC_ABI(td->td_proc) == SV_ABI_LINUX; | |||||
| NL_LOG(LOG_DEBUG2, "socket %p, %sPID %d: attaching socket to %s", | |||||
| so, is_linux ? "(linux) " : "", curproc->p_pid, | |||||
| nl_get_proto_name(proto)); | |||||
| /* Create per-VNET state on first socket init */ | |||||
| struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); | |||||
| if (ctl == NULL) | |||||
| ctl = vnet_nl_ctl_init(); | |||||
| KASSERT(V_nl_ctl != NULL, ("nl_attach: vnet_sock_init() failed")); | |||||
| MPASS(sotonlpcb(so) == NULL); | |||||
| nlp = malloc(sizeof(struct nlpcb), M_PCB, M_WAITOK | M_ZERO); | |||||
| error = soreserve(so, nl_sendspace, nl_recvspace); | |||||
| if (error != 0) { | |||||
| free(nlp, M_PCB); | |||||
| return (error); | |||||
| } | |||||
| so->so_pcb = nlp; | |||||
Done Inline ActionsThe cast isn't needed. glebius: The cast isn't needed. | |||||
| nlp->nl_socket = so; | |||||
| /* Copy so_cred to avoid having socket_var.h in every header */ | |||||
| nlp->nl_cred = so->so_cred; | |||||
| nlp->nl_proto = proto; | |||||
| nlp->nl_process_id = curproc->p_pid; | |||||
| nlp->nl_linux = is_linux; | |||||
| nlp->nl_active = true; | |||||
| NLP_LOCK_INIT(nlp); | |||||
| refcount_init(&nlp->nl_refcount, 1); | |||||
| nlp->nl_taskqueue = taskqueue_create("netlink_socket", M_WAITOK, | |||||
| taskqueue_thread_enqueue, &nlp->nl_taskqueue); | |||||
| TASK_INIT(&nlp->nl_task, 0, nl_taskqueue_handler, nlp); | |||||
| taskqueue_start_threads(&nlp->nl_taskqueue, 1, PWAIT, | |||||
| "netlink_socket (PID %u)", nlp->nl_process_id); | |||||
| NLCTL_WLOCK(ctl); | |||||
| /* XXX: check ctl is still alive */ | |||||
| CK_LIST_INSERT_HEAD(&ctl->ctl_pcb_head, nlp, nl_next); | |||||
| NLCTL_WUNLOCK(ctl); | |||||
| soisconnected(so); | |||||
| return (0); | |||||
| } | |||||
| static void | |||||
| nl_pru_abort(struct socket *so) | |||||
| { | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); | |||||
| MPASS(sotonlpcb(so) != NULL); | |||||
| soisdisconnected(so); | |||||
| } | |||||
| static int | |||||
| nl_pru_bind(struct socket *so, struct sockaddr *sa, struct thread *td) | |||||
| { | |||||
| struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); | |||||
| struct nlpcb *nlp = sotonlpcb(so); | |||||
| struct sockaddr_nl *snl = (struct sockaddr_nl *)sa; | |||||
| int error; | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); | |||||
| if (snl->nl_len != sizeof(*snl)) { | |||||
| NL_LOG(LOG_DEBUG, "socket %p, wrong sizeof(), ignoring bind()", so); | |||||
| return (EINVAL); | |||||
| } | |||||
| NLCTL_WLOCK(ctl); | |||||
| NLP_LOCK(nlp); | |||||
| error = nl_bind_locked(nlp, snl); | |||||
| NLP_UNLOCK(nlp); | |||||
| NLCTL_WUNLOCK(ctl); | |||||
| NL_LOG(LOG_DEBUG2, "socket %p, bind() to %u, groups %u, error %d", so, | |||||
| snl->nl_pid, snl->nl_groups, error); | |||||
| return (error); | |||||
| } | |||||
| static int | |||||
| nl_assign_port(struct nlpcb *nlp, uint32_t port_id) | |||||
| { | |||||
| struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); | |||||
| struct sockaddr_nl snl = { | |||||
| .nl_pid = port_id, | |||||
| }; | |||||
| int error; | |||||
| NLCTL_WLOCK(ctl); | |||||
| NLP_LOCK(nlp); | |||||
| snl.nl_groups = nlp->nl_groups; | |||||
| error = nl_bind_locked(nlp, &snl); | |||||
| NLP_UNLOCK(nlp); | |||||
| NLCTL_WUNLOCK(ctl); | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, port assign: %d, error: %d", nlp->nl_socket, port_id, error); | |||||
| return (error); | |||||
| } | |||||
| /* | |||||
| * nl_autobind_port binds a unused portid to @nlp | |||||
| * @nlp: pcb data for the netlink socket | |||||
| * @candidate_id: first id to consider | |||||
| */ | |||||
| static int | |||||
| nl_autobind_port(struct nlpcb *nlp, uint32_t candidate_id) | |||||
| { | |||||
| struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); | |||||
| uint32_t port_id = candidate_id; | |||||
| NLCTL_TRACKER; | |||||
| bool exist; | |||||
| int error; | |||||
| for (int i = 0; i < 10; i++) { | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, trying to assign port %d", nlp->nl_socket, port_id); | |||||
| NLCTL_RLOCK(ctl); | |||||
| exist = nl_port_lookup(port_id) != 0; | |||||
| NLCTL_RUNLOCK(ctl); | |||||
| if (!exist) { | |||||
| error = nl_assign_port(nlp, port_id); | |||||
| if (error != EADDRINUSE) | |||||
| break; | |||||
| } | |||||
| port_id++; | |||||
| } | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, autobind to %d, error: %d", nlp->nl_socket, port_id, error); | |||||
| return (error); | |||||
| } | |||||
| static int | |||||
| nl_pru_connect(struct socket *so, struct sockaddr *sa, struct thread *td) | |||||
| { | |||||
| struct sockaddr_nl *snl = (struct sockaddr_nl *)sa; | |||||
| struct nlpcb *nlp; | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); | |||||
| if (snl->nl_len != sizeof(*snl)) { | |||||
| NL_LOG(LOG_DEBUG, "socket %p, wrong sizeof(), ignoring bind()", so); | |||||
| return (EINVAL); | |||||
| } | |||||
| nlp = sotonlpcb(so); | |||||
| if (!nlp->nl_bound) { | |||||
| int error = nl_autobind_port(nlp, td->td_proc->p_pid); | |||||
| if (error != 0) { | |||||
| NL_LOG(LOG_DEBUG, "socket %p, nl_autobind() failed: %d", so, error); | |||||
| return (error); | |||||
| } | |||||
| } | |||||
| /* XXX: Handle socket flags & multicast */ | |||||
| soisconnected(so); | |||||
| NL_LOG(LOG_DEBUG2, "socket %p, connect to %u", so, snl->nl_pid); | |||||
| return (0); | |||||
| } | |||||
| static void | |||||
| destroy_nlpcb(struct nlpcb *nlp) | |||||
| { | |||||
| NLP_LOCK(nlp); | |||||
| nl_free_io(nlp); | |||||
| NLP_LOCK_DESTROY(nlp); | |||||
| free(nlp, M_PCB); | |||||
| } | |||||
| static void | |||||
| destroy_nlpcb_epoch(epoch_context_t ctx) | |||||
| { | |||||
| struct nlpcb *nlp; | |||||
| nlp = __containerof(ctx, struct nlpcb, nl_epoch_ctx); | |||||
| destroy_nlpcb(nlp); | |||||
| } | |||||
| static void | |||||
| nl_pru_detach(struct socket *so) | |||||
| { | |||||
| struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); | |||||
| MPASS(sotonlpcb(so) != NULL); | |||||
| struct nlpcb *nlp; | |||||
| NL_LOG(LOG_DEBUG2, "detaching socket %p, PID %d", so, curproc->p_pid); | |||||
| nlp = sotonlpcb(so); | |||||
| /* Mark as inactive so no new work can be enqueued */ | |||||
| NLP_LOCK(nlp); | |||||
| bool was_bound = nlp->nl_bound; | |||||
| nlp->nl_active = false; | |||||
| NLP_UNLOCK(nlp); | |||||
| /* Wait till all scheduled work has been completed */ | |||||
| taskqueue_drain_all(nlp->nl_taskqueue); | |||||
| taskqueue_free(nlp->nl_taskqueue); | |||||
| NLCTL_WLOCK(ctl); | |||||
| NLP_LOCK(nlp); | |||||
| if (was_bound) { | |||||
| CK_LIST_REMOVE(nlp, nl_port_next); | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, unlinking bound pid %u", so, nlp->nl_port); | |||||
| } | |||||
| CK_LIST_REMOVE(nlp, nl_next); | |||||
| nlp->nl_socket = NULL; | |||||
| NLP_UNLOCK(nlp); | |||||
| NLCTL_WUNLOCK(ctl); | |||||
| so->so_pcb = NULL; | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, detached", so); | |||||
| /* XXX: is delayed free needed? */ | |||||
| epoch_call(net_epoch_preempt, destroy_nlpcb_epoch, &nlp->nl_epoch_ctx); | |||||
| } | |||||
| static int | |||||
| nl_pru_disconnect(struct socket *so) | |||||
| { | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); | |||||
| MPASS(sotonlpcb(so) != NULL); | |||||
| return (ENOTCONN); | |||||
| } | |||||
| static int | |||||
| nl_pru_peeraddr(struct socket *so, struct sockaddr **sa) | |||||
| { | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); | |||||
| MPASS(sotonlpcb(so) != NULL); | |||||
| return (ENOTCONN); | |||||
| } | |||||
| static int | |||||
| nl_pru_shutdown(struct socket *so) | |||||
| { | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); | |||||
| MPASS(sotonlpcb(so) != NULL); | |||||
| socantsendmore(so); | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| nl_pru_sockaddr(struct socket *so, struct sockaddr **sa) | |||||
| { | |||||
| struct sockaddr_nl *snl; | |||||
| snl = malloc(sizeof(struct sockaddr_nl), M_SONAME, M_WAITOK | M_ZERO); | |||||
| /* TODO: set other fields */ | |||||
| snl->nl_len = sizeof(struct sockaddr_nl); | |||||
| snl->nl_family = AF_NETLINK; | |||||
| snl->nl_pid = sotonlpcb(so)->nl_port; | |||||
| *sa = (struct sockaddr *)snl; | |||||
| return (0); | |||||
| } | |||||
| static void | |||||
| nl_pru_close(struct socket *so) | |||||
| { | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); | |||||
| MPASS(sotonlpcb(so) != NULL); | |||||
| soisdisconnected(so); | |||||
| } | |||||
| static int | |||||
| nl_pru_output(struct mbuf *m, struct socket *so, ...) | |||||
| { | |||||
| if (__predict_false(m == NULL || | |||||
| ((m->m_len < sizeof(struct nlmsghdr)) && | |||||
| (m = m_pullup(m, sizeof(struct nlmsghdr))) == NULL))) | |||||
| return (ENOBUFS); | |||||
| MPASS((m->m_flags & M_PKTHDR) != 0); | |||||
| NL_LOG(LOG_DEBUG3, "sending message to kernel async processing"); | |||||
| nl_receive_async(m, so); | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| nl_pru_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *sa, | |||||
| struct mbuf *control, struct thread *td) | |||||
| { | |||||
| NL_LOG(LOG_DEBUG2, "sending message to kernel"); | |||||
| if (__predict_false(control != NULL)) { | |||||
| if (control->m_len) { | |||||
| m_freem(control); | |||||
| return (EINVAL); | |||||
| } | |||||
| m_freem(control); | |||||
| } | |||||
| return (nl_pru_output(m, so)); | |||||
| } | |||||
| static int | |||||
| nl_pru_rcvd(struct socket *so, int flags) | |||||
| { | |||||
| NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); | |||||
| MPASS(sotonlpcb(so) != NULL); | |||||
| nl_on_transmit(sotonlpcb(so)); | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| nl_getoptflag(int sopt_name) | |||||
| { | |||||
| switch (sopt_name) { | |||||
| case NETLINK_CAP_ACK: | |||||
| return (NLF_CAP_ACK); | |||||
| case NETLINK_EXT_ACK: | |||||
| return (NLF_EXT_ACK); | |||||
| case NETLINK_GET_STRICT_CHK: | |||||
| return (NLF_STRICT); | |||||
| } | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| nl_ctloutput(struct socket *so, struct sockopt *sopt) | |||||
| { | |||||
| struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); | |||||
| struct nlpcb *nlp = sotonlpcb(so); | |||||
| uint32_t flag; | |||||
| uint64_t groups, group_mask; | |||||
| int optval, error = 0; | |||||
| NLCTL_TRACKER; | |||||
| NL_LOG(LOG_DEBUG2, "%ssockopt(%p, %d)", (sopt->sopt_dir) ? "set" : "get", | |||||
| so, sopt->sopt_name); | |||||
| switch (sopt->sopt_dir) { | |||||
| case SOPT_SET: | |||||
| switch (sopt->sopt_name) { | |||||
| case NETLINK_ADD_MEMBERSHIP: | |||||
| case NETLINK_DROP_MEMBERSHIP: | |||||
| sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval)); | |||||
| if (optval <= 0 || optval >= 64) { | |||||
| error = ERANGE; | |||||
| break; | |||||
| } | |||||
| group_mask = (uint64_t)1 << (optval - 1); | |||||
| NL_LOG(LOG_DEBUG2, "ADD/DEL group %d mask (%lX)", optval, group_mask); | |||||
| NLCTL_WLOCK(ctl); | |||||
| if (sopt->sopt_name == NETLINK_ADD_MEMBERSHIP) | |||||
| groups = nlp->nl_groups | group_mask; | |||||
| else | |||||
| groups = nlp->nl_groups & ~group_mask; | |||||
| nl_update_groups_locked(nlp, groups); | |||||
| NLCTL_WUNLOCK(ctl); | |||||
| break; | |||||
| case NETLINK_CAP_ACK: | |||||
| case NETLINK_EXT_ACK: | |||||
| case NETLINK_GET_STRICT_CHK: | |||||
| sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval)); | |||||
| flag = nl_getoptflag(sopt->sopt_name); | |||||
| NLCTL_WLOCK(ctl); | |||||
| if (optval != 0) | |||||
| nlp->nl_flags |= flag; | |||||
| else | |||||
| nlp->nl_flags &= ~flag; | |||||
| NLCTL_WUNLOCK(ctl); | |||||
| break; | |||||
| default: | |||||
| error = ENOPROTOOPT; | |||||
| } | |||||
| break; | |||||
| case SOPT_GET: | |||||
| switch (sopt->sopt_name) { | |||||
Done Inline ActionsThis declaration isn't needed. glebius: This declaration isn't needed. | |||||
| case NETLINK_LIST_MEMBERSHIPS: | |||||
| NLCTL_RLOCK(ctl); | |||||
| optval = nlp->nl_groups; | |||||
| NLCTL_RUNLOCK(ctl); | |||||
| error = sooptcopyout(sopt, &optval, sizeof(optval)); | |||||
| break; | |||||
| case NETLINK_CAP_ACK: | |||||
| case NETLINK_EXT_ACK: | |||||
| case NETLINK_GET_STRICT_CHK: | |||||
| NLCTL_RLOCK(ctl); | |||||
| optval = (nlp->nl_flags & nl_getoptflag(sopt->sopt_name)) != 0; | |||||
| NLCTL_RUNLOCK(ctl); | |||||
| error = sooptcopyout(sopt, &optval, sizeof(optval)); | |||||
| break; | |||||
| default: | |||||
| error = ENOPROTOOPT; | |||||
| } | |||||
| break; | |||||
| default: | |||||
| error = ENOPROTOOPT; | |||||
| } | |||||
| return (error); | |||||
| } | |||||
| static int | |||||
| nl_setsbopt(struct socket *so, struct sockopt *sopt) | |||||
| { | |||||
| int error, optval; | |||||
| bool result; | |||||
| if (sopt->sopt_name != SO_RCVBUF) | |||||
| return (sbsetopt(so, sopt)); | |||||
| /* Allow to override max buffer size in certain conditions */ | |||||
| error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); | |||||
| if (error != 0) | |||||
| return (error); | |||||
| NL_LOG(LOG_DEBUG2, "socket %p, PID %d, SO_RCVBUF=%d", so, curproc->p_pid, optval); | |||||
| if (optval > sb_max_adj) { | |||||
| if (priv_check(curthread, PRIV_NET_ROUTE) != 0) | |||||
| return (EPERM); | |||||
| } | |||||
| SOCK_RECVBUF_LOCK(so); | |||||
| result = sbreserve_locked_limit(so, SO_RCV, optval, nl_maxsockbuf, curthread); | |||||
| SOCK_RECVBUF_UNLOCK(so); | |||||
| return (result ? 0 : ENOBUFS); | |||||
| } | |||||
| static struct protosw netlinksw = { | |||||
| .pr_type = SOCK_RAW, | |||||
| .pr_flags = PR_ATOMIC | PR_ADDR | PR_WANTRCVD, | |||||
| .pr_ctloutput = nl_ctloutput, | |||||
| .pr_setsbopt = nl_setsbopt, | |||||
| .pr_abort = nl_pru_abort, | |||||
| .pr_attach = nl_pru_attach, | |||||
| .pr_bind = nl_pru_bind, | |||||
| .pr_connect = nl_pru_connect, | |||||
| .pr_detach = nl_pru_detach, | |||||
| .pr_disconnect = nl_pru_disconnect, | |||||
| .pr_peeraddr = nl_pru_peeraddr, | |||||
| .pr_send = nl_pru_send, | |||||
| .pr_rcvd = nl_pru_rcvd, | |||||
| .pr_shutdown = nl_pru_shutdown, | |||||
| .pr_sockaddr = nl_pru_sockaddr, | |||||
| .pr_close = nl_pru_close | |||||
| }; | |||||
| static struct domain netlinkdomain = { | |||||
| .dom_family = PF_NETLINK, | |||||
| .dom_name = "netlink", | |||||
| .dom_flags = DOMF_UNLOADABLE, | |||||
| .dom_nprotosw = 1, | |||||
| .dom_protosw = { &netlinksw }, | |||||
| }; | |||||
| DOMAIN_SET(netlink); | |||||
Possible spelling error. You wrote 'nam', but did you mean 'name'?