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Code

lldp: shorten code a bit

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This commit is contained in:
Yu Watanabe 2021-10-19 20:16:34 +09:00
parent e2c7c38b74
commit 36f1955da8
1 changed files with 5 additions and 16 deletions
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21
src/libsystemd-network/lldp-network.c
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@ -9,7 +9,6 @@
#include "socket-util.h"
int lldp_network_bind_raw_socket(int ifindex) {
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 */
@ -24,26 +23,21 @@ int lldp_network_bind_raw_socket(int ifindex) {
BPF_STMT(BPF_RET + BPF_K, 0), /* drop packet */
BPF_STMT(BPF_RET + BPF_K, UINT32_MAX), /* accept packet */
};
static const struct sock_fprog fprog = {
.len = ELEMENTSOF(filter),
.filter = (struct sock_filter*) filter,
};
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);
@ -52,29 +46,24 @@ int lldp_network_bind_raw_socket(int ifindex) {
if (fd < 0)
return -errno;
r = setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog));
if (r < 0)
if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog)) < 0)
return -errno;
/* customer bridge */
r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
if (r < 0)
if (setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0)
return -errno;
/* non TPMR bridge */
mreq.mr_address[ETH_ALEN - 1] = 0x03;
r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
if (r < 0)
if (setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0)
return -errno;
/* nearest bridge */
mreq.mr_address[ETH_ALEN - 1] = 0x0E;
r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
if (r < 0)
if (setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0)
return -errno;
r = bind(fd, &saddrll.sa, sizeof(saddrll.ll));
if (r < 0)
if (bind(fd, &saddrll.sa, sizeof(saddrll.ll)) < 0)
return -errno;
return TAKE_FD(fd);