+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- 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 <errno.h>
-#include <sys/socket.h>
-#include <net/if.h>
-#include <asm/types.h>
-#include <netinet/in.h>
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-
-#include "util.h"
-#include "macro.h"
-#include "loopback-setup.h"
-#include "socket-util.h"
-
-#define NLMSG_TAIL(nmsg) \
- ((struct rtattr *) (((uint8_t*) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
-
-static int add_rtattr(struct nlmsghdr *n, size_t max_length, int type, const void *data, size_t data_length) {
- size_t length;
- struct rtattr *rta;
-
- length = RTA_LENGTH(data_length);
-
- if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(length) > max_length)
- return -E2BIG;
-
- rta = NLMSG_TAIL(n);
- rta->rta_type = type;
- rta->rta_len = length;
- memcpy(RTA_DATA(rta), data, data_length);
- n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(length);
-
- return 0;
-}
-
-static ssize_t sendto_loop(int fd, const void *buf, size_t buf_len, int flags, const struct sockaddr *sa, socklen_t sa_len) {
-
- for (;;) {
- ssize_t l;
-
- if ((l = sendto(fd, buf, buf_len, flags, sa, sa_len)) >= 0)
- return l;
-
- if (errno != EINTR)
- return -errno;
- }
-}
-
-static ssize_t recvfrom_loop(int fd, void *buf, size_t buf_len, int flags, struct sockaddr *sa, socklen_t *sa_len) {
-
- for (;;) {
- ssize_t l;
-
- if ((l = recvfrom(fd, buf, buf_len, flags, sa, sa_len)) >= 0)
- return l;
-
- if (errno != EINTR)
- return -errno;
- }
-}
-
-static int add_adresses(int fd, int if_loopback, unsigned *requests) {
- union {
- struct sockaddr sa;
- struct sockaddr_nl nl;
- } sa;
- union {
- struct nlmsghdr header;
- uint8_t buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
- NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
- RTA_LENGTH(sizeof(struct in6_addr))];
- } request;
-
- struct ifaddrmsg *ifaddrmsg;
- uint32_t ipv4_address = htonl(INADDR_LOOPBACK);
- int r;
-
- zero(request);
-
- request.header.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
- request.header.nlmsg_type = RTM_NEWADDR;
- request.header.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_ACK;
- request.header.nlmsg_seq = *requests + 1;
-
- ifaddrmsg = NLMSG_DATA(&request.header);
- ifaddrmsg->ifa_family = AF_INET;
- ifaddrmsg->ifa_prefixlen = 8;
- ifaddrmsg->ifa_flags = IFA_F_PERMANENT;
- ifaddrmsg->ifa_scope = RT_SCOPE_HOST;
- ifaddrmsg->ifa_index = if_loopback;
-
- if ((r = add_rtattr(&request.header, sizeof(request), IFA_LOCAL, &ipv4_address, sizeof(ipv4_address))) < 0)
- return r;
-
- zero(sa);
- sa.nl.nl_family = AF_NETLINK;
-
- if (sendto_loop(fd, &request, request.header.nlmsg_len, 0, &sa.sa, sizeof(sa)) < 0)
- return -errno;
- (*requests)++;
-
- if (!socket_ipv6_is_supported())
- return 0;
-
- request.header.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
- request.header.nlmsg_seq = *requests + 1;
-
- ifaddrmsg->ifa_family = AF_INET6;
- ifaddrmsg->ifa_prefixlen = 128;
-
- if ((r = add_rtattr(&request.header, sizeof(request), IFA_LOCAL, &in6addr_loopback, sizeof(in6addr_loopback))) < 0)
- return r;
-
- if (sendto_loop(fd, &request, request.header.nlmsg_len, 0, &sa.sa, sizeof(sa)) < 0)
- return -errno;
- (*requests)++;
-
- return 0;
-}
-
-static int start_interface(int fd, int if_loopback, unsigned *requests) {
- union {
- struct sockaddr sa;
- struct sockaddr_nl nl;
- } sa;
- union {
- struct nlmsghdr header;
- uint8_t buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
- NLMSG_ALIGN(sizeof(struct ifinfomsg))];
- } request;
-
- struct ifinfomsg *ifinfomsg;
-
- zero(request);
-
- request.header.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
- request.header.nlmsg_type = RTM_NEWLINK;
- request.header.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
- request.header.nlmsg_seq = *requests + 1;
-
- ifinfomsg = NLMSG_DATA(&request.header);
- ifinfomsg->ifi_family = AF_UNSPEC;
- ifinfomsg->ifi_index = if_loopback;
- ifinfomsg->ifi_flags = IFF_UP;
- ifinfomsg->ifi_change = IFF_UP;
-
- zero(sa);
- sa.nl.nl_family = AF_NETLINK;
-
- if (sendto_loop(fd, &request, request.header.nlmsg_len, 0, &sa.sa, sizeof(sa)) < 0)
- return -errno;
-
- (*requests)++;
-
- return 0;
-}
-
-static int read_response(int fd, unsigned requests_max) {
- union {
- struct sockaddr sa;
- struct sockaddr_nl nl;
- } sa;
- union {
- struct nlmsghdr header;
- uint8_t buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
- NLMSG_ALIGN(sizeof(struct nlmsgerr))];
- } response;
-
- ssize_t l;
- socklen_t sa_len = sizeof(sa);
- struct nlmsgerr *nlmsgerr;
-
- if ((l = recvfrom_loop(fd, &response, sizeof(response), 0, &sa.sa, &sa_len)) < 0)
- return -errno;
-
- if (sa_len != sizeof(sa.nl) ||
- sa.nl.nl_family != AF_NETLINK)
- return -EIO;
-
- if (sa.nl.nl_pid != 0)
- return 0;
-
- if ((size_t) l < sizeof(struct nlmsghdr))
- return -EIO;
-
- if (response.header.nlmsg_type != NLMSG_ERROR ||
- (pid_t) response.header.nlmsg_pid != getpid() ||
- response.header.nlmsg_seq >= requests_max)
- return 0;
-
- if ((size_t) l < NLMSG_LENGTH(sizeof(struct nlmsgerr)) ||
- response.header.nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
- return -EIO;
-
- nlmsgerr = NLMSG_DATA(&response.header);
-
- if (nlmsgerr->error < 0 && nlmsgerr->error != -EEXIST) {
- log_warning("Netlink failure for request %i: %s", response.header.nlmsg_seq, strerror(-nlmsgerr->error));
- return nlmsgerr->error;
- }
-
- return response.header.nlmsg_seq;
-}
-
-int loopback_setup(void) {
- int r, if_loopback;
- union {
- struct sockaddr sa;
- struct sockaddr_nl nl;
- struct sockaddr_storage storage;
- } sa;
- unsigned requests = 0, i;
- int fd;
-
- errno = 0;
- if ((if_loopback = (int) if_nametoindex("lo")) <= 0)
- return errno ? -errno : -ENODEV;
-
- if ((fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0)
- return -errno;
-
- zero(sa);
- sa.nl.nl_family = AF_NETLINK;
-
- if (bind(fd, &sa.sa, sizeof(sa)) < 0) {
- r = -errno;
- goto finish;
- }
-
- if ((r = add_adresses(fd, if_loopback, &requests)) < 0)
- goto finish;
-
- if ((r = start_interface(fd, if_loopback, &requests)) < 0)
- goto finish;
-
- for (i = 0; i < requests; i++) {
- if ((r = read_response(fd, requests)) < 0)
- goto finish;
- }
-
- r = 0;
-
-finish:
- if (r < 0)
- log_warning("Failed to configure loopback device: %s", strerror(-r));
-
- if (fd >= 0)
- close_nointr_nofail(fd);
-
- return r;
-}
~ianmdlvl / elogind.git / blobdiff