Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 203 insertions, 0 deletions

diff --git a/src/libsystemd-network/icmp6-util.c b/src/libsystemd-network/icmp6-util.c
new file mode 100644
index 0000000..72c20ba
--- /dev/null
+++ b/src/libsystemd-network/icmp6-util.c
@@ -0,0 +1,203 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/***
+  Copyright © 2014 Intel Corporation. All rights reserved.
+***/
+
+#include <errno.h>
+#include <netinet/icmp6.h>
+#include <netinet/in.h>
+#include <netinet/ip6.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <net/if.h>
+#include <linux/if_packet.h>
+
+#include "fd-util.h"
+#include "icmp6-util.h"
+#include "in-addr-util.h"
+#include "iovec-util.h"
+#include "network-common.h"
+#include "socket-util.h"
+
+#define IN6ADDR_ALL_ROUTERS_MULTICAST_INIT \
+        { { { 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+              0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 } } }
+
+#define IN6ADDR_ALL_NODES_MULTICAST_INIT \
+        { { { 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+              0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } } }
+
+static int icmp6_bind_router_message(const struct icmp6_filter *filter,
+                                     const struct ipv6_mreq *mreq) {
+        int ifindex = mreq->ipv6mr_interface;
+        _cleanup_close_ int s = -EBADF;
+        int r;
+
+        assert(filter);
+        assert(mreq);
+
+        s = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK, IPPROTO_ICMPV6);
+        if (s < 0)
+                return -errno;
+
+        if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, filter, sizeof(*filter)) < 0)
+                return -errno;
+
+        if (setsockopt(s, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, mreq, sizeof(*mreq)) < 0)
+                return -errno;
+
+        /* RFC 3315, section 6.7, bullet point 2 may indicate that an
+           IPV6_PKTINFO socket option also applies for ICMPv6 multicast.
+           Empirical experiments indicates otherwise and therefore an
+           IPV6_MULTICAST_IF socket option is used here instead */
+        r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_IF, ifindex);
+        if (r < 0)
+                return r;
+
+        r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, false);
+        if (r < 0)
+                return r;
+
+        r = setsockopt_int(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 255);
+        if (r < 0)
+                return r;
+
+        r = setsockopt_int(s, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 255);
+        if (r < 0)
+                return r;
+
+        r = setsockopt_int(s, SOL_IPV6, IPV6_RECVHOPLIMIT, true);
+        if (r < 0)
+                return r;
+
+        r = setsockopt_int(s, SOL_SOCKET, SO_TIMESTAMP, true);
+        if (r < 0)
+                return r;
+
+        r = socket_bind_to_ifindex(s, ifindex);
+        if (r < 0)
+                return r;
+
+        return TAKE_FD(s);
+}
+
+int icmp6_bind_router_solicitation(int ifindex) {
+        struct icmp6_filter filter = {};
+        struct ipv6_mreq mreq = {
+                .ipv6mr_multiaddr = IN6ADDR_ALL_NODES_MULTICAST_INIT,
+                .ipv6mr_interface = ifindex,
+        };
+
+        ICMP6_FILTER_SETBLOCKALL(&filter);
+        ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filter);
+
+        return icmp6_bind_router_message(&filter, &mreq);
+}
+
+int icmp6_bind_router_advertisement(int ifindex) {
+        struct icmp6_filter filter = {};
+        struct ipv6_mreq mreq = {
+                .ipv6mr_multiaddr = IN6ADDR_ALL_ROUTERS_MULTICAST_INIT,
+                .ipv6mr_interface = ifindex,
+        };
+
+        ICMP6_FILTER_SETBLOCKALL(&filter);
+        ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filter);
+
+        return icmp6_bind_router_message(&filter, &mreq);
+}
+
+int icmp6_send_router_solicitation(int s, const struct ether_addr *ether_addr) {
+        struct sockaddr_in6 dst = {
+                .sin6_family = AF_INET6,
+                .sin6_addr = IN6ADDR_ALL_ROUTERS_MULTICAST_INIT,
+        };
+        struct {
+                struct nd_router_solicit rs;
+                struct nd_opt_hdr rs_opt;
+                struct ether_addr rs_opt_mac;
+        } _packed_ rs = {
+                .rs.nd_rs_type = ND_ROUTER_SOLICIT,
+                .rs_opt.nd_opt_type = ND_OPT_SOURCE_LINKADDR,
+                .rs_opt.nd_opt_len = 1,
+        };
+        struct iovec iov = {
+                .iov_base = &rs,
+                .iov_len = sizeof(rs),
+        };
+        struct msghdr msg = {
+                .msg_name = &dst,
+                .msg_namelen = sizeof(dst),
+                .msg_iov = &iov,
+                .msg_iovlen = 1,
+        };
+
+        assert(s >= 0);
+        assert(ether_addr);
+
+        rs.rs_opt_mac = *ether_addr;
+
+        if (sendmsg(s, &msg, 0) < 0)
+                return -errno;
+
+        return 0;
+}
+
+int icmp6_receive(
+                int fd,
+                void *buffer,
+                size_t size,
+                struct in6_addr *ret_sender,
+                triple_timestamp *ret_timestamp) {
+
+        /* This needs to be initialized with zero. See #20741. */
+        CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int)) + /* ttl */
+                         CMSG_SPACE_TIMEVAL) control = {};
+        struct iovec iov = {};
+        union sockaddr_union sa = {};
+        struct msghdr msg = {
+                .msg_name = &sa.sa,
+                .msg_namelen = sizeof(sa),
+                .msg_iov = &iov,
+                .msg_iovlen = 1,
+                .msg_control = &control,
+                .msg_controllen = sizeof(control),
+        };
+        struct in6_addr addr = {};
+        ssize_t len;
+
+        iov = IOVEC_MAKE(buffer, size);
+
+        len = recvmsg_safe(fd, &msg, MSG_DONTWAIT);
+        if (len < 0)
+                return (int) len;
+
+        if ((size_t) len != size)
+                return -EINVAL;
+
+        if (msg.msg_namelen == sizeof(struct sockaddr_in6) &&
+            sa.in6.sin6_family == AF_INET6)  {
+
+                addr = sa.in6.sin6_addr;
+                if (!in6_addr_is_link_local(&addr) && !in6_addr_is_null(&addr))
+                        return -EADDRNOTAVAIL;
+
+        } else if (msg.msg_namelen > 0)
+                return -EPFNOSUPPORT;
+
+        /* namelen == 0 only happens when running the test-suite over a socketpair */
+
+        assert(!(msg.msg_flags & MSG_TRUNC));
+
+        int *hops = CMSG_FIND_DATA(&msg, SOL_IPV6, IPV6_HOPLIMIT, int);
+        if (hops && *hops != 255)
+                return -EMULTIHOP;
+
+        if (ret_timestamp)
+                triple_timestamp_from_cmsg(ret_timestamp, &msg);
+        if (ret_sender)
+                *ret_sender = addr;
+        return 0;
+}