diff options
Diffstat (limited to 'src/libsystemd/sd-netlink')
| -rw-r--r-- | src/libsystemd/sd-netlink/netlink-internal.h | 1 | ||||
| -rw-r--r-- | src/libsystemd/sd-netlink/netlink-message.c | 799 | ||||
| -rw-r--r-- | src/libsystemd/sd-netlink/netlink-socket.c | 275 | ||||
| -rw-r--r-- | src/libsystemd/sd-netlink/rtnl-message.c | 588 |
4 files changed, 867 insertions, 796 deletions
diff --git a/src/libsystemd/sd-netlink/netlink-internal.h b/src/libsystemd/sd-netlink/netlink-internal.h index 24ebbbe7df..763acbbb09 100644 --- a/src/libsystemd/sd-netlink/netlink-internal.h +++ b/src/libsystemd/sd-netlink/netlink-internal.h @@ -111,6 +111,7 @@ struct sd_netlink_message { }; int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type); +int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret); int socket_write_message(sd_netlink *nl, sd_netlink_message *m); int socket_read_message(sd_netlink *nl); diff --git a/src/libsystemd/sd-netlink/netlink-message.c b/src/libsystemd/sd-netlink/netlink-message.c index fe9714ab5d..87324fc2f7 100644 --- a/src/libsystemd/sd-netlink/netlink-message.c +++ b/src/libsystemd/sd-netlink/netlink-message.c @@ -39,7 +39,7 @@ #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) -static int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { +int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { sd_netlink_message *m; assert_return(ret, -EINVAL); @@ -95,305 +95,6 @@ int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { return 0; } -int sd_rtnl_message_route_set_dst_prefixlen(sd_netlink_message *m, unsigned char prefixlen) { - struct rtmsg *rtm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); - - rtm = NLMSG_DATA(m->hdr); - - if ((rtm->rtm_family == AF_INET && prefixlen > 32) || - (rtm->rtm_family == AF_INET6 && prefixlen > 128)) - return -ERANGE; - - rtm->rtm_dst_len = prefixlen; - - return 0; -} - -int sd_rtnl_message_route_set_src_prefixlen(sd_netlink_message *m, unsigned char prefixlen) { - struct rtmsg *rtm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); - - rtm = NLMSG_DATA(m->hdr); - - if ((rtm->rtm_family == AF_INET && prefixlen > 32) || - (rtm->rtm_family == AF_INET6 && prefixlen > 128)) - return -ERANGE; - - rtm->rtm_src_len = prefixlen; - - return 0; -} - -int sd_rtnl_message_route_set_scope(sd_netlink_message *m, unsigned char scope) { - struct rtmsg *rtm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); - - rtm = NLMSG_DATA(m->hdr); - - rtm->rtm_scope = scope; - - return 0; -} - -int sd_rtnl_message_route_get_family(sd_netlink_message *m, int *family) { - struct rtmsg *rtm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); - assert_return(family, -EINVAL); - - rtm = NLMSG_DATA(m->hdr); - - *family = rtm->rtm_family; - - return 0; -} - -int sd_rtnl_message_route_get_dst_prefixlen(sd_netlink_message *m, unsigned char *dst_len) { - struct rtmsg *rtm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); - assert_return(dst_len, -EINVAL); - - rtm = NLMSG_DATA(m->hdr); - - *dst_len = rtm->rtm_dst_len; - - return 0; -} - -int sd_rtnl_message_route_get_src_prefixlen(sd_netlink_message *m, unsigned char *src_len) { - struct rtmsg *rtm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); - assert_return(src_len, -EINVAL); - - rtm = NLMSG_DATA(m->hdr); - - *src_len = rtm->rtm_src_len; - - return 0; -} - -int sd_rtnl_message_new_route(sd_netlink *rtnl, sd_netlink_message **ret, - uint16_t nlmsg_type, int rtm_family, - unsigned char rtm_protocol) { - struct rtmsg *rtm; - int r; - - assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL); - assert_return((nlmsg_type == RTM_GETROUTE && rtm_family == AF_UNSPEC) || - rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL); - assert_return(ret, -EINVAL); - - r = message_new(rtnl, ret, nlmsg_type); - if (r < 0) - return r; - - if (nlmsg_type == RTM_NEWROUTE) - (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND; - - rtm = NLMSG_DATA((*ret)->hdr); - - rtm->rtm_family = rtm_family; - rtm->rtm_scope = RT_SCOPE_UNIVERSE; - rtm->rtm_type = RTN_UNICAST; - rtm->rtm_table = RT_TABLE_MAIN; - rtm->rtm_protocol = rtm_protocol; - - return 0; -} - -int sd_rtnl_message_neigh_set_flags(sd_netlink_message *m, uint8_t flags) { - struct ndmsg *ndm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); - - ndm = NLMSG_DATA(m->hdr); - ndm->ndm_flags |= flags; - - return 0; -} - -int sd_rtnl_message_neigh_set_state(sd_netlink_message *m, uint16_t state) { - struct ndmsg *ndm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); - - ndm = NLMSG_DATA(m->hdr); - ndm->ndm_state |= state; - - return 0; -} - -int sd_rtnl_message_neigh_get_flags(sd_netlink_message *m, uint8_t *flags) { - struct ndmsg *ndm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); - - ndm = NLMSG_DATA(m->hdr); - *flags = ndm->ndm_flags; - - return 0; -} - -int sd_rtnl_message_neigh_get_state(sd_netlink_message *m, uint16_t *state) { - struct ndmsg *ndm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); - - ndm = NLMSG_DATA(m->hdr); - *state = ndm->ndm_state; - - return 0; -} - -int sd_rtnl_message_neigh_get_family(sd_netlink_message *m, int *family) { - struct ndmsg *ndm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); - assert_return(family, -EINVAL); - - ndm = NLMSG_DATA(m->hdr); - - *family = ndm->ndm_family; - - return 0; -} - -int sd_rtnl_message_neigh_get_ifindex(sd_netlink_message *m, int *index) { - struct ndmsg *ndm; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); - assert_return(index, -EINVAL); - - ndm = NLMSG_DATA(m->hdr); - - *index = ndm->ndm_ifindex; - - return 0; -} - -int sd_rtnl_message_new_neigh(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int index, int ndm_family) { - struct ndmsg *ndm; - int r; - - assert_return(rtnl_message_type_is_neigh(nlmsg_type), -EINVAL); - assert_return(ndm_family == AF_INET || - ndm_family == AF_INET6 || - ndm_family == PF_BRIDGE, -EINVAL); - assert_return(ret, -EINVAL); - - r = message_new(rtnl, ret, nlmsg_type); - if (r < 0) - return r; - - if (nlmsg_type == RTM_NEWNEIGH) - (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND; - - ndm = NLMSG_DATA((*ret)->hdr); - - ndm->ndm_family = ndm_family; - ndm->ndm_ifindex = index; - - return 0; -} - -int sd_rtnl_message_link_set_flags(sd_netlink_message *m, unsigned flags, unsigned change) { - struct ifinfomsg *ifi; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); - assert_return(change, -EINVAL); - - ifi = NLMSG_DATA(m->hdr); - - ifi->ifi_flags = flags; - ifi->ifi_change = change; - - return 0; -} - -int sd_rtnl_message_link_set_type(sd_netlink_message *m, unsigned type) { - struct ifinfomsg *ifi; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); - - ifi = NLMSG_DATA(m->hdr); - - ifi->ifi_type = type; - - return 0; -} - -int sd_rtnl_message_link_set_family(sd_netlink_message *m, unsigned family) { - struct ifinfomsg *ifi; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); - - ifi = NLMSG_DATA(m->hdr); - - ifi->ifi_family = family; - - return 0; -} - -int sd_rtnl_message_new_link(sd_netlink *rtnl, sd_netlink_message **ret, - uint16_t nlmsg_type, int index) { - struct ifinfomsg *ifi; - int r; - - assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL); - assert_return(nlmsg_type != RTM_DELLINK || index > 0, -EINVAL); - assert_return(ret, -EINVAL); - - r = message_new(rtnl, ret, nlmsg_type); - if (r < 0) - return r; - - if (nlmsg_type == RTM_NEWLINK) - (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL; - - ifi = NLMSG_DATA((*ret)->hdr); - - ifi->ifi_family = AF_UNSPEC; - ifi->ifi_index = index; - - return 0; -} - int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { assert_return(m, -EINVAL); assert_return(m->hdr, -EINVAL); @@ -411,172 +112,6 @@ int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { return 0; } -int sd_rtnl_message_addr_set_prefixlen(sd_netlink_message *m, unsigned char prefixlen) { - struct ifaddrmsg *ifa; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); - - ifa = NLMSG_DATA(m->hdr); - - if ((ifa->ifa_family == AF_INET && prefixlen > 32) || - (ifa->ifa_family == AF_INET6 && prefixlen > 128)) - return -ERANGE; - - ifa->ifa_prefixlen = prefixlen; - - return 0; -} - -int sd_rtnl_message_addr_set_flags(sd_netlink_message *m, unsigned char flags) { - struct ifaddrmsg *ifa; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); - - ifa = NLMSG_DATA(m->hdr); - - ifa->ifa_flags = flags; - - return 0; -} - -int sd_rtnl_message_addr_set_scope(sd_netlink_message *m, unsigned char scope) { - struct ifaddrmsg *ifa; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); - - ifa = NLMSG_DATA(m->hdr); - - ifa->ifa_scope = scope; - - return 0; -} - -int sd_rtnl_message_addr_get_family(sd_netlink_message *m, int *family) { - struct ifaddrmsg *ifa; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); - assert_return(family, -EINVAL); - - ifa = NLMSG_DATA(m->hdr); - - *family = ifa->ifa_family; - - return 0; -} - -int sd_rtnl_message_addr_get_prefixlen(sd_netlink_message *m, unsigned char *prefixlen) { - struct ifaddrmsg *ifa; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); - assert_return(prefixlen, -EINVAL); - - ifa = NLMSG_DATA(m->hdr); - - *prefixlen = ifa->ifa_prefixlen; - - return 0; -} - -int sd_rtnl_message_addr_get_scope(sd_netlink_message *m, unsigned char *scope) { - struct ifaddrmsg *ifa; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); - assert_return(scope, -EINVAL); - - ifa = NLMSG_DATA(m->hdr); - - *scope = ifa->ifa_scope; - - return 0; -} - -int sd_rtnl_message_addr_get_flags(sd_netlink_message *m, unsigned char *flags) { - struct ifaddrmsg *ifa; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); - assert_return(flags, -EINVAL); - - ifa = NLMSG_DATA(m->hdr); - - *flags = ifa->ifa_flags; - - return 0; -} - -int sd_rtnl_message_addr_get_ifindex(sd_netlink_message *m, int *ifindex) { - struct ifaddrmsg *ifa; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); - assert_return(ifindex, -EINVAL); - - ifa = NLMSG_DATA(m->hdr); - - *ifindex = ifa->ifa_index; - - return 0; -} - -int sd_rtnl_message_new_addr(sd_netlink *rtnl, sd_netlink_message **ret, - uint16_t nlmsg_type, int index, - int family) { - struct ifaddrmsg *ifa; - int r; - - assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL); - assert_return((nlmsg_type == RTM_GETADDR && index == 0) || - index > 0, -EINVAL); - assert_return((nlmsg_type == RTM_GETADDR && family == AF_UNSPEC) || - family == AF_INET || family == AF_INET6, -EINVAL); - assert_return(ret, -EINVAL); - - r = message_new(rtnl, ret, nlmsg_type); - if (r < 0) - return r; - - if (nlmsg_type == RTM_GETADDR) - (*ret)->hdr->nlmsg_flags |= NLM_F_DUMP; - - ifa = NLMSG_DATA((*ret)->hdr); - - ifa->ifa_index = index; - ifa->ifa_family = family; - if (family == AF_INET) - ifa->ifa_prefixlen = 32; - else if (family == AF_INET6) - ifa->ifa_prefixlen = 128; - - return 0; -} - -int sd_rtnl_message_new_addr_update(sd_netlink *rtnl, sd_netlink_message **ret, - int index, int family) { - int r; - - r = sd_rtnl_message_new_addr(rtnl, ret, RTM_NEWADDR, index, family); - if (r < 0) - return r; - - (*ret)->hdr->nlmsg_flags |= NLM_F_REPLACE; - - return 0; -} - sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { if (m) assert_se(REFCNT_INC(m->n_ref) >= 2); @@ -610,100 +145,12 @@ int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { return 0; } -int sd_netlink_message_get_family(sd_netlink_message *m, int *family) { - assert_return(m, -EINVAL); - assert_return(family, -EINVAL); - - assert(m->hdr); - - if (rtnl_message_type_is_link(m->hdr->nlmsg_type)) { - struct ifinfomsg *ifi; - - ifi = NLMSG_DATA(m->hdr); - - *family = ifi->ifi_family; - - return 0; - } else if (rtnl_message_type_is_route(m->hdr->nlmsg_type)) { - struct rtmsg *rtm; - - rtm = NLMSG_DATA(m->hdr); - - *family = rtm->rtm_family; - - return 0; - } else if (rtnl_message_type_is_neigh(m->hdr->nlmsg_type)) { - struct ndmsg *ndm; - - ndm = NLMSG_DATA(m->hdr); - - *family = ndm->ndm_family; - - return 0; - } else if (rtnl_message_type_is_addr(m->hdr->nlmsg_type)) { - struct ifaddrmsg *ifa; - - ifa = NLMSG_DATA(m->hdr); - - *family = ifa->ifa_family; - - return 0; - } - - return -EOPNOTSUPP; -} - int sd_netlink_message_is_broadcast(sd_netlink_message *m) { assert_return(m, -EINVAL); return m->broadcast; } -int sd_rtnl_message_link_get_ifindex(sd_netlink_message *m, int *ifindex) { - struct ifinfomsg *ifi; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); - assert_return(ifindex, -EINVAL); - - ifi = NLMSG_DATA(m->hdr); - - *ifindex = ifi->ifi_index; - - return 0; -} - -int sd_rtnl_message_link_get_flags(sd_netlink_message *m, unsigned *flags) { - struct ifinfomsg *ifi; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); - assert_return(flags, -EINVAL); - - ifi = NLMSG_DATA(m->hdr); - - *flags = ifi->ifi_flags; - - return 0; -} - -int sd_rtnl_message_link_get_type(sd_netlink_message *m, unsigned *type) { - struct ifinfomsg *ifi; - - assert_return(m, -EINVAL); - assert_return(m->hdr, -EINVAL); - assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); - assert_return(type, -EINVAL); - - ifi = NLMSG_DATA(m->hdr); - - *type = ifi->ifi_type; - - return 0; -} - /* If successful the updated message will be correctly aligned, if unsuccessful the old message is untouched. */ static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { @@ -951,7 +398,7 @@ int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type return r; size = (size_t) r; - r = sd_netlink_message_get_family(m, &family); + r = sd_rtnl_message_get_family(m, &family); if (r < 0) return r; @@ -1274,7 +721,7 @@ int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short typ { int family; - r = sd_netlink_message_get_family(m, &family); + r = sd_rtnl_message_get_family(m, &family); if (r < 0) return r; @@ -1393,246 +840,6 @@ int rtnl_message_parse(sd_netlink_message *m, return 0; } -/* returns the number of bytes sent, or a negative error code */ -int socket_write_message(sd_netlink *nl, sd_netlink_message *m) { - union { - struct sockaddr sa; - struct sockaddr_nl nl; - } addr = { - .nl.nl_family = AF_NETLINK, - }; - ssize_t k; - - assert(nl); - assert(m); - assert(m->hdr); - - k = sendto(nl->fd, m->hdr, m->hdr->nlmsg_len, - 0, &addr.sa, sizeof(addr)); - if (k < 0) - return -errno; - - return k; -} - -static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool peek) { - union sockaddr_union sender; - uint8_t cmsg_buffer[CMSG_SPACE(sizeof(struct nl_pktinfo))]; - struct msghdr msg = { - .msg_iov = iov, - .msg_iovlen = 1, - .msg_name = &sender, - .msg_namelen = sizeof(sender), - .msg_control = cmsg_buffer, - .msg_controllen = sizeof(cmsg_buffer), - }; - struct cmsghdr *cmsg; - uint32_t group = 0; - int r; - - assert(fd >= 0); - assert(iov); - - r = recvmsg(fd, &msg, MSG_TRUNC | (peek ? MSG_PEEK : 0)); - if (r < 0) { - /* no data */ - if (errno == ENOBUFS) - log_debug("rtnl: kernel receive buffer overrun"); - else if (errno == EAGAIN) - log_debug("rtnl: no data in socket"); - - return (errno == EAGAIN || errno == EINTR) ? 0 : -errno; - } - - if (sender.nl.nl_pid != 0) { - /* not from the kernel, ignore */ - log_debug("rtnl: ignoring message from portid %"PRIu32, sender.nl.nl_pid); - - if (peek) { - /* drop the message */ - r = recvmsg(fd, &msg, 0); - if (r < 0) - return (errno == EAGAIN || errno == EINTR) ? 0 : -errno; - } - - return 0; - } - - CMSG_FOREACH(cmsg, &msg) { - if (cmsg->cmsg_level == SOL_NETLINK && - cmsg->cmsg_type == NETLINK_PKTINFO && - cmsg->cmsg_len == CMSG_LEN(sizeof(struct nl_pktinfo))) { - struct nl_pktinfo *pktinfo = (void *)CMSG_DATA(cmsg); - - /* multi-cast group */ - group = pktinfo->group; - } - } - - if (_group) - *_group = group; - - return r; -} - -/* On success, the number of bytes received is returned and *ret points to the received message - * which has a valid header and the correct size. - * If nothing useful was received 0 is returned. - * On failure, a negative error code is returned. - */ -int socket_read_message(sd_netlink *rtnl) { - _cleanup_netlink_message_unref_ sd_netlink_message *first = NULL; - struct iovec iov = {}; - uint32_t group = 0; - bool multi_part = false, done = false; - struct nlmsghdr *new_msg; - size_t len; - int r; - unsigned i = 0; - - assert(rtnl); - assert(rtnl->rbuffer); - assert(rtnl->rbuffer_allocated >= sizeof(struct nlmsghdr)); - - /* read nothing, just get the pending message size */ - r = socket_recv_message(rtnl->fd, &iov, NULL, true); - if (r <= 0) - return r; - else - len = (size_t)r; - - /* make room for the pending message */ - if (!greedy_realloc((void **)&rtnl->rbuffer, - &rtnl->rbuffer_allocated, - len, sizeof(uint8_t))) - return -ENOMEM; - - iov.iov_base = rtnl->rbuffer; - iov.iov_len = rtnl->rbuffer_allocated; - - /* read the pending message */ - r = socket_recv_message(rtnl->fd, &iov, &group, false); - if (r <= 0) - return r; - else - len = (size_t)r; - - if (len > rtnl->rbuffer_allocated) - /* message did not fit in read buffer */ - return -EIO; - - if (NLMSG_OK(rtnl->rbuffer, len) && rtnl->rbuffer->nlmsg_flags & NLM_F_MULTI) { - multi_part = true; - - for (i = 0; i < rtnl->rqueue_partial_size; i++) { - if (rtnl_message_get_serial(rtnl->rqueue_partial[i]) == - rtnl->rbuffer->nlmsg_seq) { - first = rtnl->rqueue_partial[i]; - break; - } - } - } - - for (new_msg = rtnl->rbuffer; NLMSG_OK(new_msg, len) && !done; new_msg = NLMSG_NEXT(new_msg, len)) { - _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; - const NLType *nl_type; - - if (!group && new_msg->nlmsg_pid != rtnl->sockaddr.nl.nl_pid) - /* not broadcast and not for us */ - continue; - - if (new_msg->nlmsg_type == NLMSG_NOOP) - /* silently drop noop messages */ - continue; - - if (new_msg->nlmsg_type == NLMSG_DONE) { - /* finished reading multi-part message */ - done = true; - - /* if first is not defined, put NLMSG_DONE into the receive queue. */ - if (first) - continue; - } - - /* check that we support this message type */ - r = type_system_get_type(NULL, &nl_type, new_msg->nlmsg_type); - if (r < 0) { - if (r == -EOPNOTSUPP) - log_debug("sd-netlink: ignored message with unknown type: %i", - new_msg->nlmsg_type); - - continue; - } - - /* check that the size matches the message type */ - if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size)) { - log_debug("sd-netlink: message larger than expected, dropping"); - continue; - } - - r = message_new_empty(rtnl, &m); - if (r < 0) - return r; - - m->broadcast = !!group; - - m->hdr = memdup(new_msg, new_msg->nlmsg_len); - if (!m->hdr) - return -ENOMEM; - - /* seal and parse the top-level message */ - r = sd_netlink_message_rewind(m); - if (r < 0) - return r; - - /* push the message onto the multi-part message stack */ - if (first) - m->next = first; - first = m; - m = NULL; - } - - if (len) - log_debug("sd-netlink: discarding %zu bytes of incoming message", len); - - if (!first) - return 0; - - if (!multi_part || done) { - /* we got a complete message, push it on the read queue */ - r = rtnl_rqueue_make_room(rtnl); - if (r < 0) - return r; - - rtnl->rqueue[rtnl->rqueue_size ++] = first; - first = NULL; - - if (multi_part && (i < rtnl->rqueue_partial_size)) { - /* remove the message form the partial read queue */ - memmove(rtnl->rqueue_partial + i,rtnl->rqueue_partial + i + 1, - sizeof(sd_netlink_message*) * (rtnl->rqueue_partial_size - i - 1)); - rtnl->rqueue_partial_size --; - } - - return 1; - } else { - /* we only got a partial multi-part message, push it on the - partial read queue */ - if (i < rtnl->rqueue_partial_size) { - rtnl->rqueue_partial[i] = first; - } else { - r = rtnl_rqueue_partial_make_room(rtnl); - if (r < 0) - return r; - - rtnl->rqueue_partial[rtnl->rqueue_partial_size ++] = first; - } - first = NULL; - - return 0; - } -} - int sd_netlink_message_rewind(sd_netlink_message *m) { const NLType *type; unsigned i; diff --git a/src/libsystemd/sd-netlink/netlink-socket.c b/src/libsystemd/sd-netlink/netlink-socket.c new file mode 100644 index 0000000000..2e2826ac63 --- /dev/null +++ b/src/libsystemd/sd-netlink/netlink-socket.c @@ -0,0 +1,275 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2013 Tom Gundersen <teg@jklm.no> + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <netinet/in.h> +#include <stdbool.h> +#include <unistd.h> + +#include "util.h" +#include "socket-util.h" +#include "formats-util.h" +#include "refcnt.h" +#include "missing.h" + +#include "sd-netlink.h" +#include "netlink-util.h" +#include "netlink-internal.h" +#include "netlink-types.h" + +/* returns the number of bytes sent, or a negative error code */ +int socket_write_message(sd_netlink *nl, sd_netlink_message *m) { + union { + struct sockaddr sa; + struct sockaddr_nl nl; + } addr = { + .nl.nl_family = AF_NETLINK, + }; + ssize_t k; + + assert(nl); + assert(m); + assert(m->hdr); + + k = sendto(nl->fd, m->hdr, m->hdr->nlmsg_len, + 0, &addr.sa, sizeof(addr)); + if (k < 0) + return -errno; + + return k; +} + +static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool peek) { + union sockaddr_union sender; + uint8_t cmsg_buffer[CMSG_SPACE(sizeof(struct nl_pktinfo))]; + struct msghdr msg = { + .msg_iov = iov, + .msg_iovlen = 1, + .msg_name = &sender, + .msg_namelen = sizeof(sender), + .msg_control = cmsg_buffer, + .msg_controllen = sizeof(cmsg_buffer), + }; + struct cmsghdr *cmsg; + uint32_t group = 0; + int r; + + assert(fd >= 0); + assert(iov); + + r = recvmsg(fd, &msg, MSG_TRUNC | (peek ? MSG_PEEK : 0)); + if (r < 0) { + /* no data */ + if (errno == ENOBUFS) + log_debug("rtnl: kernel receive buffer overrun"); + else if (errno == EAGAIN) + log_debug("rtnl: no data in socket"); + + return (errno == EAGAIN || errno == EINTR) ? 0 : -errno; + } + + if (sender.nl.nl_pid != 0) { + /* not from the kernel, ignore */ + log_debug("rtnl: ignoring message from portid %"PRIu32, sender.nl.nl_pid); + + if (peek) { + /* drop the message */ + r = recvmsg(fd, &msg, 0); + if (r < 0) + return (errno == EAGAIN || errno == EINTR) ? 0 : -errno; + } + + return 0; + } + + CMSG_FOREACH(cmsg, &msg) { + if (cmsg->cmsg_level == SOL_NETLINK && + cmsg->cmsg_type == NETLINK_PKTINFO && + cmsg->cmsg_len == CMSG_LEN(sizeof(struct nl_pktinfo))) { + struct nl_pktinfo *pktinfo = (void *)CMSG_DATA(cmsg); + + /* multi-cast group */ + group = pktinfo->group; + } + } + + if (_group) + *_group = group; + + return r; +} + +/* On success, the number of bytes received is returned and *ret points to the received message + * which has a valid header and the correct size. + * If nothing useful was received 0 is returned. + * On failure, a negative error code is returned. + */ +int socket_read_message(sd_netlink *rtnl) { + _cleanup_netlink_message_unref_ sd_netlink_message *first = NULL; + struct iovec iov = {}; + uint32_t group = 0; + bool multi_part = false, done = false; + struct nlmsghdr *new_msg; + size_t len; + int r; + unsigned i = 0; + + assert(rtnl); + assert(rtnl->rbuffer); + assert(rtnl->rbuffer_allocated >= sizeof(struct nlmsghdr)); + + /* read nothing, just get the pending message size */ + r = socket_recv_message(rtnl->fd, &iov, NULL, true); + if (r <= 0) + return r; + else + len = (size_t)r; + + /* make room for the pending message */ + if (!greedy_realloc((void **)&rtnl->rbuffer, + &rtnl->rbuffer_allocated, + len, sizeof(uint8_t))) + return -ENOMEM; + + iov.iov_base = rtnl->rbuffer; + iov.iov_len = rtnl->rbuffer_allocated; + + /* read the pending message */ + r = socket_recv_message(rtnl->fd, &iov, &group, false); + if (r <= 0) + return r; + else + len = (size_t)r; + + if (len > rtnl->rbuffer_allocated) + /* message did not fit in read buffer */ + return -EIO; + + if (NLMSG_OK(rtnl->rbuffer, len) && rtnl->rbuffer->nlmsg_flags & NLM_F_MULTI) { + multi_part = true; + + for (i = 0; i < rtnl->rqueue_partial_size; i++) { + if (rtnl_message_get_serial(rtnl->rqueue_partial[i]) == + rtnl->rbuffer->nlmsg_seq) { + first = rtnl->rqueue_partial[i]; + break; + } + } + } + + for (new_msg = rtnl->rbuffer; NLMSG_OK(new_msg, len) && !done; new_msg = NLMSG_NEXT(new_msg, len)) { + _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; + const NLType *nl_type; + + if (!group && new_msg->nlmsg_pid != rtnl->sockaddr.nl.nl_pid) + /* not broadcast and not for us */ + continue; + + if (new_msg->nlmsg_type == NLMSG_NOOP) + /* silently drop noop messages */ + continue; + + if (new_msg->nlmsg_type == NLMSG_DONE) { + /* finished reading multi-part message */ + done = true; + + /* if first is not defined, put NLMSG_DONE into the receive queue. */ + if (first) + continue; + } + + /* check that we support this message type */ + r = type_system_get_type(NULL, &nl_type, new_msg->nlmsg_type); + if (r < 0) { + if (r == -EOPNOTSUPP) + log_debug("sd-netlink: ignored message with unknown type: %i", + new_msg->nlmsg_type); + + continue; + } + + /* check that the size matches the message type */ + if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size)) { + log_debug("sd-netlink: message larger than expected, dropping"); + continue; + } + + r = message_new_empty(rtnl, &m); + if (r < 0) + return r; + + m->broadcast = !!group; + + m->hdr = memdup(new_msg, new_msg->nlmsg_len); + if (!m->hdr) + return -ENOMEM; + + /* seal and parse the top-level message */ + r = sd_netlink_message_rewind(m); + if (r < 0) + return r; + + /* push the message onto the multi-part message stack */ + if (first) + m->next = first; + first = m; + m = NULL; + } + + if (len) + log_debug("sd-netlink: discarding %zu bytes of incoming message", len); + + if (!first) + return 0; + + if (!multi_part || done) { + /* we got a complete message, push it on the read queue */ + r = rtnl_rqueue_make_room(rtnl); + if (r < 0) + return r; + + rtnl->rqueue[rtnl->rqueue_size ++] = first; + first = NULL; + + if (multi_part && (i < rtnl->rqueue_partial_size)) { + /* remove the message form the partial read queue */ + memmove(rtnl->rqueue_partial + i,rtnl->rqueue_partial + i + 1, + sizeof(sd_netlink_message*) * (rtnl->rqueue_partial_size - i - 1)); + rtnl->rqueue_partial_size --; + } + + return 1; + } else { + /* we only got a partial multi-part message, push it on the + partial read queue */ + if (i < rtnl->rqueue_partial_size) { + rtnl->rqueue_partial[i] = first; + } else { + r = rtnl_rqueue_partial_make_room(rtnl); + if (r < 0) + return r; + + rtnl->rqueue_partial[rtnl->rqueue_partial_size ++] = first; + } + first = NULL; + + return 0; + } +} diff --git a/src/libsystemd/sd-netlink/rtnl-message.c b/src/libsystemd/sd-netlink/rtnl-message.c new file mode 100644 index 0000000000..2f31f4ee69 --- /dev/null +++ b/src/libsystemd/sd-netlink/rtnl-message.c @@ -0,0 +1,588 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2013 Tom Gundersen <teg@jklm.no> + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <netinet/in.h> +#include <stdbool.h> +#include <unistd.h> + +#include "util.h" +#include "socket-util.h" +#include "formats-util.h" +#include "refcnt.h" +#include "missing.h" + +#include "sd-netlink.h" +#include "netlink-util.h" +#include "netlink-internal.h" +#include "netlink-types.h" + +int sd_rtnl_message_route_set_dst_prefixlen(sd_netlink_message *m, unsigned char prefixlen) { + struct rtmsg *rtm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); + + rtm = NLMSG_DATA(m->hdr); + + if ((rtm->rtm_family == AF_INET && prefixlen > 32) || + (rtm->rtm_family == AF_INET6 && prefixlen > 128)) + return -ERANGE; + + rtm->rtm_dst_len = prefixlen; + + return 0; +} + +int sd_rtnl_message_route_set_src_prefixlen(sd_netlink_message *m, unsigned char prefixlen) { + struct rtmsg *rtm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); + + rtm = NLMSG_DATA(m->hdr); + + if ((rtm->rtm_family == AF_INET && prefixlen > 32) || + (rtm->rtm_family == AF_INET6 && prefixlen > 128)) + return -ERANGE; + + rtm->rtm_src_len = prefixlen; + + return 0; +} + +int sd_rtnl_message_route_set_scope(sd_netlink_message *m, unsigned char scope) { + struct rtmsg *rtm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); + + rtm = NLMSG_DATA(m->hdr); + + rtm->rtm_scope = scope; + + return 0; +} + +int sd_rtnl_message_route_get_family(sd_netlink_message *m, int *family) { + struct rtmsg *rtm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); + assert_return(family, -EINVAL); + + rtm = NLMSG_DATA(m->hdr); + + *family = rtm->rtm_family; + + return 0; +} + +int sd_rtnl_message_route_get_dst_prefixlen(sd_netlink_message *m, unsigned char *dst_len) { + struct rtmsg *rtm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); + assert_return(dst_len, -EINVAL); + + rtm = NLMSG_DATA(m->hdr); + + *dst_len = rtm->rtm_dst_len; + + return 0; +} + +int sd_rtnl_message_route_get_src_prefixlen(sd_netlink_message *m, unsigned char *src_len) { + struct rtmsg *rtm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); + assert_return(src_len, -EINVAL); + + rtm = NLMSG_DATA(m->hdr); + + *src_len = rtm->rtm_src_len; + + return 0; +} + +int sd_rtnl_message_new_route(sd_netlink *rtnl, sd_netlink_message **ret, + uint16_t nlmsg_type, int rtm_family, + unsigned char rtm_protocol) { + struct rtmsg *rtm; + int r; + + assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL); + assert_return((nlmsg_type == RTM_GETROUTE && rtm_family == AF_UNSPEC) || + rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL); + assert_return(ret, -EINVAL); + + r = message_new(rtnl, ret, nlmsg_type); + if (r < 0) + return r; + + if (nlmsg_type == RTM_NEWROUTE) + (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND; + + rtm = NLMSG_DATA((*ret)->hdr); + + rtm->rtm_family = rtm_family; + rtm->rtm_scope = RT_SCOPE_UNIVERSE; + rtm->rtm_type = RTN_UNICAST; + rtm->rtm_table = RT_TABLE_MAIN; + rtm->rtm_protocol = rtm_protocol; + + return 0; +} + +int sd_rtnl_message_neigh_set_flags(sd_netlink_message *m, uint8_t flags) { + struct ndmsg *ndm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); + + ndm = NLMSG_DATA(m->hdr); + ndm->ndm_flags |= flags; + + return 0; +} + +int sd_rtnl_message_neigh_set_state(sd_netlink_message *m, uint16_t state) { + struct ndmsg *ndm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); + + ndm = NLMSG_DATA(m->hdr); + ndm->ndm_state |= state; + + return 0; +} + +int sd_rtnl_message_neigh_get_flags(sd_netlink_message *m, uint8_t *flags) { + struct ndmsg *ndm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); + + ndm = NLMSG_DATA(m->hdr); + *flags = ndm->ndm_flags; + + return 0; +} + +int sd_rtnl_message_neigh_get_state(sd_netlink_message *m, uint16_t *state) { + struct ndmsg *ndm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); + + ndm = NLMSG_DATA(m->hdr); + *state = ndm->ndm_state; + + return 0; +} + +int sd_rtnl_message_neigh_get_family(sd_netlink_message *m, int *family) { + struct ndmsg *ndm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); + assert_return(family, -EINVAL); + + ndm = NLMSG_DATA(m->hdr); + + *family = ndm->ndm_family; + + return 0; +} + +int sd_rtnl_message_neigh_get_ifindex(sd_netlink_message *m, int *index) { + struct ndmsg *ndm; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); + assert_return(index, -EINVAL); + + ndm = NLMSG_DATA(m->hdr); + + *index = ndm->ndm_ifindex; + + return 0; +} + +int sd_rtnl_message_new_neigh(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int index, int ndm_family) { + struct ndmsg *ndm; + int r; + + assert_return(rtnl_message_type_is_neigh(nlmsg_type), -EINVAL); + assert_return(ndm_family == AF_INET || + ndm_family == AF_INET6 || + ndm_family == PF_BRIDGE, -EINVAL); + assert_return(ret, -EINVAL); + + r = message_new(rtnl, ret, nlmsg_type); + if (r < 0) + return r; + + if (nlmsg_type == RTM_NEWNEIGH) + (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND; + + ndm = NLMSG_DATA((*ret)->hdr); + + ndm->ndm_family = ndm_family; + ndm->ndm_ifindex = index; + + return 0; +} + +int sd_rtnl_message_link_set_flags(sd_netlink_message *m, unsigned flags, unsigned change) { + struct ifinfomsg *ifi; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); + assert_return(change, -EINVAL); + + ifi = NLMSG_DATA(m->hdr); + + ifi->ifi_flags = flags; + ifi->ifi_change = change; + + return 0; +} + +int sd_rtnl_message_link_set_type(sd_netlink_message *m, unsigned type) { + struct ifinfomsg *ifi; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); + + ifi = NLMSG_DATA(m->hdr); + + ifi->ifi_type = type; + + return 0; +} + +int sd_rtnl_message_link_set_family(sd_netlink_message *m, unsigned family) { + struct ifinfomsg *ifi; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); + + ifi = NLMSG_DATA(m->hdr); + + ifi->ifi_family = family; + + return 0; +} + +int sd_rtnl_message_new_link(sd_netlink *rtnl, sd_netlink_message **ret, + uint16_t nlmsg_type, int index) { + struct ifinfomsg *ifi; + int r; + + assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL); + assert_return(nlmsg_type != RTM_DELLINK || index > 0, -EINVAL); + assert_return(ret, -EINVAL); + + r = message_new(rtnl, ret, nlmsg_type); + if (r < 0) + return r; + + if (nlmsg_type == RTM_NEWLINK) + (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL; + + ifi = NLMSG_DATA((*ret)->hdr); + + ifi->ifi_family = AF_UNSPEC; + ifi->ifi_index = index; + + return 0; +} + +int sd_rtnl_message_addr_set_prefixlen(sd_netlink_message *m, unsigned char prefixlen) { + struct ifaddrmsg *ifa; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); + + ifa = NLMSG_DATA(m->hdr); + + if ((ifa->ifa_family == AF_INET && prefixlen > 32) || + (ifa->ifa_family == AF_INET6 && prefixlen > 128)) + return -ERANGE; + + ifa->ifa_prefixlen = prefixlen; + + return 0; +} + +int sd_rtnl_message_addr_set_flags(sd_netlink_message *m, unsigned char flags) { + struct ifaddrmsg *ifa; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); + + ifa = NLMSG_DATA(m->hdr); + + ifa->ifa_flags = flags; + + return 0; +} + +int sd_rtnl_message_addr_set_scope(sd_netlink_message *m, unsigned char scope) { + struct ifaddrmsg *ifa; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); + + ifa = NLMSG_DATA(m->hdr); + + ifa->ifa_scope = scope; + + return 0; +} + +int sd_rtnl_message_addr_get_family(sd_netlink_message *m, int *family) { + struct ifaddrmsg *ifa; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); + assert_return(family, -EINVAL); + + ifa = NLMSG_DATA(m->hdr); + + *family = ifa->ifa_family; + + return 0; +} + +int sd_rtnl_message_addr_get_prefixlen(sd_netlink_message *m, unsigned char *prefixlen) { + struct ifaddrmsg *ifa; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); + assert_return(prefixlen, -EINVAL); + + ifa = NLMSG_DATA(m->hdr); + + *prefixlen = ifa->ifa_prefixlen; + + return 0; +} + +int sd_rtnl_message_addr_get_scope(sd_netlink_message *m, unsigned char *scope) { + struct ifaddrmsg *ifa; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); + assert_return(scope, -EINVAL); + + ifa = NLMSG_DATA(m->hdr); + + *scope = ifa->ifa_scope; + + return 0; +} + +int sd_rtnl_message_addr_get_flags(sd_netlink_message *m, unsigned char *flags) { + struct ifaddrmsg *ifa; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); + assert_return(flags, -EINVAL); + + ifa = NLMSG_DATA(m->hdr); + + *flags = ifa->ifa_flags; + + return 0; +} + +int sd_rtnl_message_addr_get_ifindex(sd_netlink_message *m, int *ifindex) { + struct ifaddrmsg *ifa; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); + assert_return(ifindex, -EINVAL); + + ifa = NLMSG_DATA(m->hdr); + + *ifindex = ifa->ifa_index; + + return 0; +} + +int sd_rtnl_message_new_addr(sd_netlink *rtnl, sd_netlink_message **ret, + uint16_t nlmsg_type, int index, + int family) { + struct ifaddrmsg *ifa; + int r; + + assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL); + assert_return((nlmsg_type == RTM_GETADDR && index == 0) || + index > 0, -EINVAL); + assert_return((nlmsg_type == RTM_GETADDR && family == AF_UNSPEC) || + family == AF_INET || family == AF_INET6, -EINVAL); + assert_return(ret, -EINVAL); + + r = message_new(rtnl, ret, nlmsg_type); + if (r < 0) + return r; + + if (nlmsg_type == RTM_GETADDR) + (*ret)->hdr->nlmsg_flags |= NLM_F_DUMP; + + ifa = NLMSG_DATA((*ret)->hdr); + + ifa->ifa_index = index; + ifa->ifa_family = family; + if (family == AF_INET) + ifa->ifa_prefixlen = 32; + else if (family == AF_INET6) + ifa->ifa_prefixlen = 128; + + return 0; +} + +int sd_rtnl_message_new_addr_update(sd_netlink *rtnl, sd_netlink_message **ret, + int index, int family) { + int r; + + r = sd_rtnl_message_new_addr(rtnl, ret, RTM_NEWADDR, index, family); + if (r < 0) + return r; + + (*ret)->hdr->nlmsg_flags |= NLM_F_REPLACE; + + return 0; +} + +int sd_rtnl_message_link_get_ifindex(sd_netlink_message *m, int *ifindex) { + struct ifinfomsg *ifi; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); + assert_return(ifindex, -EINVAL); + + ifi = NLMSG_DATA(m->hdr); + + *ifindex = ifi->ifi_index; + + return 0; +} + +int sd_rtnl_message_link_get_flags(sd_netlink_message *m, unsigned *flags) { + struct ifinfomsg *ifi; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); + assert_return(flags, -EINVAL); + + ifi = NLMSG_DATA(m->hdr); + + *flags = ifi->ifi_flags; + + return 0; +} + +int sd_rtnl_message_link_get_type(sd_netlink_message *m, unsigned *type) { + struct ifinfomsg *ifi; + + assert_return(m, -EINVAL); + assert_return(m->hdr, -EINVAL); + assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); + assert_return(type, -EINVAL); + + ifi = NLMSG_DATA(m->hdr); + + *type = ifi->ifi_type; + + return 0; +} + +int sd_rtnl_message_get_family(sd_netlink_message *m, int *family) { + assert_return(m, -EINVAL); + assert_return(family, -EINVAL); + + assert(m->hdr); + + if (rtnl_message_type_is_link(m->hdr->nlmsg_type)) { + struct ifinfomsg *ifi; + + ifi = NLMSG_DATA(m->hdr); + + *family = ifi->ifi_family; + + return 0; + } else if (rtnl_message_type_is_route(m->hdr->nlmsg_type)) { + struct rtmsg *rtm; + + rtm = NLMSG_DATA(m->hdr); + + *family = rtm->rtm_family; + + return 0; + } else if (rtnl_message_type_is_neigh(m->hdr->nlmsg_type)) { + struct ndmsg *ndm; + + ndm = NLMSG_DATA(m->hdr); + + *family = ndm->ndm_family; + + return 0; + } else if (rtnl_message_type_is_addr(m->hdr->nlmsg_type)) { + struct ifaddrmsg *ifa; + + ifa = NLMSG_DATA(m->hdr); + + *family = ifa->ifa_family; + + return 0; + } + + return -EOPNOTSUPP; +} |