-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright (C) 2014 Tom Gundersen
- Copyright (C) 2014 Susant Sahani
-
- 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/>.
-***/
+/* SPDX-License-Identifier: LGPL-2.1+ */
#include <linux/filter.h>
-#include <linux/if_ether.h>
+#include <netinet/if_ether.h>
-#include "socket-util.h"
-#include "lldp-tlv.h"
+#include "fd-util.h"
#include "lldp-network.h"
-#include "sd-lldp.h"
+#include "missing.h"
+#include "socket-util.h"
int lldp_network_bind_raw_socket(int ifindex) {
- typedef struct LLDPFrame {
- struct ethhdr hdr;
- uint8_t tlvs[0];
- } LLDPFrame;
- struct sock_filter filter[] = {
- BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(LLDPFrame, hdr.h_dest)), /* A <- 4 bytes of destination MAC */
+ static const struct sock_filter filter[] = {
+ BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(struct ethhdr, h_dest)), /* A <- 4 bytes of destination MAC */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0180c200, 1, 0), /* A != 01:80:c2:00 */
BPF_STMT(BPF_RET + BPF_K, 0), /* drop packet */
- BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(LLDPFrame, hdr.h_dest) + 4), /* A <- remaining 2 bytes of destination MAC */
+ BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct ethhdr, h_dest) + 4), /* A <- remaining 2 bytes of destination MAC */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0000, 3, 0), /* A != 00:00 */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0003, 2, 0), /* A != 00:03 */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x000e, 1, 0), /* A != 00:0e */
BPF_STMT(BPF_RET + BPF_K, 0), /* drop packet */
- BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(LLDPFrame, hdr.h_proto)), /* A <- protocol */
+ BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct ethhdr, h_proto)), /* A <- protocol */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_LLDP, 1, 0), /* A != ETHERTYPE_LLDP */
BPF_STMT(BPF_RET + BPF_K, 0), /* drop packet */
BPF_STMT(BPF_RET + BPF_K, (uint32_t) -1), /* accept packet */
};
- struct sock_fprog fprog = {
+ static const struct sock_fprog fprog = {
.len = ELEMENTSOF(filter),
- .filter = filter
+ .filter = (struct sock_filter*) filter,
};
- _cleanup_close_ int s = -1;
+ struct packet_mreq mreq = {
+ .mr_ifindex = ifindex,
+ .mr_type = PACKET_MR_MULTICAST,
+ .mr_alen = ETH_ALEN,
+ .mr_address = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x00 }
+ };
union sockaddr_union saddrll = {
.ll.sll_family = AF_PACKET,
.ll.sll_ifindex = ifindex,
};
+ _cleanup_close_ int fd = -1;
int r;
assert(ifindex > 0);
- s = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
- if (s < 0)
+ fd = socket(PF_PACKET, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK,
+ htobe16(ETHERTYPE_LLDP));
+ if (fd < 0)
return -errno;
- r = setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog));
+ r = setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog));
if (r < 0)
return -errno;
- r = bind(s, &saddrll.sa, sizeof(saddrll.ll));
+ r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
if (r < 0)
return -errno;
- r = s;
- s = -1;
-
- return r;
-}
-
-int lldp_receive_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
- _cleanup_tlv_packet_free_ tlv_packet *packet = NULL;
- tlv_packet *p;
- uint16_t length;
- int r;
-
- assert(fd);
- assert(userdata);
-
- r = tlv_packet_new(&packet);
+ mreq.mr_address[ETH_ALEN - 1] = 0x03;
+ r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
if (r < 0)
- return r;
-
- length = read(fd, &packet->pdu, sizeof(packet->pdu));
-
- /* Silently drop the packet */
- if ((size_t) length > ETHER_MAX_LEN)
- return 0;
+ return -errno;
- packet->userdata = userdata;
+ mreq.mr_address[ETH_ALEN - 1] = 0x0E;
+ r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
+ if (r < 0)
+ return -errno;
- p = packet;
- packet = NULL;
+ r = bind(fd, &saddrll.sa, sizeof(saddrll.ll));
+ if (r < 0)
+ return -errno;
- return lldp_handle_packet(p, (uint16_t) length);
+ return TAKE_FD(fd);
}
projects / thirdparty / systemd.git / blobdiff