mirror of
https://github.com/systemd/systemd.git
synced 2024-12-17 22:23:39 +08:00
loopback-setup: move to rtnl
This should be equivalent to the old behavior.
This commit is contained in:
Tom Gundersen
parent
e16bcf986e
commit
81eca919f7
@ -1024,6 +1024,7 @@ libsystemd_core_la_LIBADD = \
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libsystemd-daemon-internal.la \
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libudev-internal.la \
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libsystemd-shared.la \
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libsystemd-rtnl.la \
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$(LIBWRAP_LIBS) \
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$(PAM_LIBS) \
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$(AUDIT_LIBS) \
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@ -1851,7 +1852,8 @@ systemd_nspawn_LDADD = \
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libsystemd-bus-internal.la \
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libsystemd-id128-internal.la \
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libsystemd-daemon-internal.la \
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libsystemd-shared.la
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libsystemd-shared.la \
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libsystemd-rtnl.la
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# ------------------------------------------------------------------------------
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systemd_run_SOURCES = \
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@ -24,211 +24,91 @@
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#include <net/if.h>
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#include <asm/types.h>
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#include <netinet/in.h>
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#include <linux/rtnetlink.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include "util.h"
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#include "macro.h"
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#include "loopback-setup.h"
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#include "socket-util.h"
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#include "sd-rtnl.h"
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#include "rtnl-util.h"
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#define NLMSG_TAIL(nmsg) \
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((struct rtattr *) (((uint8_t*) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
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static int add_rtattr(struct nlmsghdr *n, size_t max_length, int type, const void *data, size_t data_length) {
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size_t length;
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struct rtattr *rta;
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length = RTA_LENGTH(data_length);
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if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(length) > max_length)
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return -E2BIG;
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rta = NLMSG_TAIL(n);
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rta->rta_type = type;
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rta->rta_len = length;
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memcpy(RTA_DATA(rta), data, data_length);
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n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(length);
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return 0;
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}
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static ssize_t sendto_loop(int fd, const void *buf, size_t buf_len, int flags, const struct sockaddr *sa, socklen_t sa_len) {
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for (;;) {
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ssize_t l;
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l = sendto(fd, buf, buf_len, flags, sa, sa_len);
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if (l >= 0)
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return l;
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if (errno != EINTR)
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return -errno;
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}
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}
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static ssize_t recvfrom_loop(int fd, void *buf, size_t buf_len, int flags, struct sockaddr *sa, socklen_t *sa_len) {
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for (;;) {
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ssize_t l;
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l = recvfrom(fd, buf, buf_len, flags, sa, sa_len);
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if (l >= 0)
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return l;
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if (errno != EINTR)
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return -errno;
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}
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}
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static int add_adresses(int fd, int if_loopback, unsigned *requests) {
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union {
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struct sockaddr sa;
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struct sockaddr_nl nl;
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} sa = {
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.nl.nl_family = AF_NETLINK,
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};
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union {
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struct nlmsghdr header;
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uint8_t buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
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NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
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RTA_LENGTH(sizeof(struct in6_addr))];
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} request = {
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.header.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
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.header.nlmsg_type = RTM_NEWADDR,
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.header.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_ACK,
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.header.nlmsg_seq = *requests + 1,
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};
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struct ifaddrmsg *ifaddrmsg;
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uint32_t ipv4_address = htonl(INADDR_LOOPBACK);
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static int pipe_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
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int *counter = userdata;
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int r;
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ifaddrmsg = NLMSG_DATA(&request.header);
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ifaddrmsg->ifa_family = AF_INET;
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ifaddrmsg->ifa_prefixlen = 8;
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ifaddrmsg->ifa_flags = IFA_F_PERMANENT;
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ifaddrmsg->ifa_scope = RT_SCOPE_HOST;
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ifaddrmsg->ifa_index = if_loopback;
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(*counter) --;
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r = add_rtattr(&request.header, sizeof(request), IFA_LOCAL,
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&ipv4_address, sizeof(ipv4_address));
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r = sd_rtnl_message_get_errno(m);
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return r == -EEXIST ? 0 : r;
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}
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static int add_adresses(sd_rtnl *rtnl, int if_loopback, uint32_t ipv4_address, int *counter) {
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_cleanup_sd_rtnl_message_unref_ sd_rtnl_message *ipv4 = NULL, *ipv6 = NULL;
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int r;
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r = sd_rtnl_message_addr_new(RTM_NEWADDR, if_loopback, AF_INET, 8, IFA_F_PERMANENT, RT_SCOPE_HOST, &ipv4);
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if (r < 0)
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return r;
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if (sendto_loop(fd, &request, request.header.nlmsg_len, 0, &sa.sa, sizeof(sa)) < 0)
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return -errno;
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(*requests)++;
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r = sd_rtnl_message_append(ipv4, IFA_LOCAL, &ipv4_address);
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if (r < 0)
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return r;
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r = sd_rtnl_call_async(rtnl, ipv4, &pipe_handler, counter, 0, NULL);
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if (r < 0)
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return r;
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(*counter) ++;
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if (!socket_ipv6_is_supported())
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return 0;
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request.header.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
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request.header.nlmsg_seq = *requests + 1;
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ifaddrmsg->ifa_family = AF_INET6;
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ifaddrmsg->ifa_prefixlen = 128;
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r = add_rtattr(&request.header, sizeof(request), IFA_LOCAL,
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&in6addr_loopback, sizeof(in6addr_loopback));
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r = sd_rtnl_message_addr_new(RTM_NEWADDR, if_loopback, AF_INET6, 128, 0, 0, &ipv6);
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if (r < 0)
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return r;
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if (sendto_loop(fd, &request, request.header.nlmsg_len, 0, &sa.sa, sizeof(sa)) < 0)
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return -errno;
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(*requests)++;
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r = sd_rtnl_message_append(ipv6, IFA_LOCAL, &in6addr_loopback);
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if (r < 0)
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return r;
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r = sd_rtnl_call_async(rtnl, ipv6, &pipe_handler, counter, 0, NULL);
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if (r < 0)
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return r;
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(*counter) ++;
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return 0;
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}
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static int start_interface(int fd, int if_loopback, unsigned *requests) {
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union {
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struct sockaddr sa;
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struct sockaddr_nl nl;
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} sa = {
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.nl.nl_family = AF_NETLINK,
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};
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static int start_interface(sd_rtnl *rtnl, int if_loopback, uint32_t ipv4_address, int *counter) {
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_cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL;
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int r;
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union {
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struct nlmsghdr header;
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uint8_t buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
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NLMSG_ALIGN(sizeof(struct ifinfomsg))];
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} request = {
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.header.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
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.header.nlmsg_type = RTM_NEWLINK,
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.header.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK,
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.header.nlmsg_seq = *requests + 1,
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};
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r = sd_rtnl_message_link_new(RTM_NEWLINK, if_loopback, 0, IFF_UP, &req);
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if (r < 0)
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return r;
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struct ifinfomsg *ifinfomsg;
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r = sd_rtnl_message_append(req, IFA_LOCAL, &ipv4_address);
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if (r < 0)
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return r;
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ifinfomsg = NLMSG_DATA(&request.header);
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ifinfomsg->ifi_family = AF_UNSPEC;
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ifinfomsg->ifi_index = if_loopback;
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ifinfomsg->ifi_flags = IFF_UP;
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ifinfomsg->ifi_change = IFF_UP;
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r = sd_rtnl_call_async(rtnl, req, &pipe_handler, counter, 0, NULL);
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if (r < 0)
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return r;
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if (sendto_loop(fd, &request, request.header.nlmsg_len, 0, &sa.sa, sizeof(sa)) < 0)
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return -errno;
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(*requests)++;
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(*counter) ++;
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return 0;
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}
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static int read_response(int fd, unsigned requests_max) {
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union {
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struct sockaddr sa;
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struct sockaddr_nl nl;
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} sa;
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union {
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struct nlmsghdr header;
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uint8_t buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
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NLMSG_ALIGN(sizeof(struct nlmsgerr))];
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} response;
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ssize_t l;
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socklen_t sa_len = sizeof(sa);
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struct nlmsgerr *nlmsgerr;
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l = recvfrom_loop(fd, &response, sizeof(response), 0, &sa.sa, &sa_len);
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if (l < 0)
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return -errno;
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if (sa_len != sizeof(sa.nl) ||
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sa.nl.nl_family != AF_NETLINK)
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return -EIO;
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if (sa.nl.nl_pid != 0)
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return 0;
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if ((size_t) l < sizeof(struct nlmsghdr))
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return -EIO;
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if (response.header.nlmsg_type != NLMSG_ERROR ||
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(pid_t) response.header.nlmsg_pid != getpid() ||
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response.header.nlmsg_seq >= requests_max)
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return 0;
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if ((size_t) l < NLMSG_LENGTH(sizeof(struct nlmsgerr)) ||
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response.header.nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
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return -EIO;
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nlmsgerr = NLMSG_DATA(&response.header);
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if (nlmsgerr->error < 0 && nlmsgerr->error != -EEXIST)
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return nlmsgerr->error;
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return response.header.nlmsg_seq;
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}
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static int check_loopback(void) {
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int r;
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_cleanup_close_ int fd;
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_cleanup_close_ int fd = -1;
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union {
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struct sockaddr sa;
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struct sockaddr_in in;
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@ -253,56 +133,48 @@ static int check_loopback(void) {
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}
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int loopback_setup(void) {
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int r, if_loopback;
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union {
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struct sockaddr sa;
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struct sockaddr_nl nl;
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} sa = {
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.nl.nl_family = AF_NETLINK,
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};
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unsigned requests = 0, i;
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_cleanup_close_ int fd = -1;
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_cleanup_sd_rtnl_unref_ sd_rtnl *rtnl = NULL;
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int r, if_loopback, counter = 0;
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bool eperm = false;
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uint32_t ipv4_address = htonl(INADDR_LOOPBACK);
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errno = 0;
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if_loopback = (int) if_nametoindex("lo");
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if (if_loopback <= 0)
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return errno ? -errno : -ENODEV;
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fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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if (fd < 0)
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return -errno;
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if (bind(fd, &sa.sa, sizeof(sa)) < 0) {
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r = -errno;
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goto error;
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}
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r = add_adresses(fd, if_loopback, &requests);
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r = sd_rtnl_open(0, &rtnl);
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if (r < 0)
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goto error;
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return r;
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r = start_interface(fd, if_loopback, &requests);
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r = add_adresses(rtnl, if_loopback, ipv4_address, &counter);
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if (r < 0)
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goto error;
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return r;
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for (i = 0; i < requests; i++) {
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r = read_response(fd, requests);
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r = start_interface(rtnl, if_loopback, ipv4_address, &counter);
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if (r < 0)
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return r;
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if (r == -EPERM)
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eperm = true;
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else if (r < 0)
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goto error;
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while (counter > 0) {
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r = sd_rtnl_wait(rtnl, 0);
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if (r < 0)
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return r;
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r = sd_rtnl_process(rtnl, 0);
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if (r < 0) {
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if (r == -EPERM)
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eperm = true;
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else {
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log_warning("Failed to configure loopback device: %s", strerror(-r));
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return r;
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}
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}
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}
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if (eperm && check_loopback() < 0) {
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r = -EPERM;
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goto error;
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log_warning("Failed to configure loopback device: %s", strerror(EPERM));
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return -EPERM;
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}
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return 0;
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error:
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log_warning("Failed to configure loopback device: %s", strerror(-r));
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return r;
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}
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