Add SPDX license identifiers to source files under the LGPL

[thirdparty/systemd.git] / src / libsystemd-network / lldp-network.c

diff --git a/src/libsystemd-network/lldp-network.c b/src/libsystemd-network/lldp-network.c
index a2bc7d5518b826a0273d279b453b3f459d1975e0..cb3841ef225223ebaf35ab775a7c26b92c552517 100644 (file)
--- a/src/libsystemd-network/lldp-network.c
+++ b/src/libsystemd-network/lldp-network.c
@@ -1,5 +1,4 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
@@ -21,92 +20,80 @@
 ***/
 
 #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 "lldp-internal.h"
-#include "sd-lldp.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));
+                return -errno;
 
-        /* Silently drop the packet */
-        if ((size_t) length > ETHER_MAX_LEN)
-                return 0;
+        mreq.mr_address[ETH_ALEN - 1] = 0x0E;
+        r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
+        if (r < 0)
+                return -errno;
 
-        packet->userdata = userdata;
+        r = bind(fd, &saddrll.sa, sizeof(saddrll.ll));
+        if (r < 0)
+                return -errno;
 
-        p = packet;
-        packet = NULL;
+        r = fd;
+        fd = -1;
 
-        return lldp_handle_packet(p, (uint16_t) length);
+        return r;
 }