summaryrefslogtreecommitdiff
path: root/src/libsystemd-network/arp-util.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libsystemd-network/arp-util.c')
-rw-r--r--src/libsystemd-network/arp-util.c154
1 files changed, 0 insertions, 154 deletions
diff --git a/src/libsystemd-network/arp-util.c b/src/libsystemd-network/arp-util.c
deleted file mode 100644
index 02028bf28a..0000000000
--- a/src/libsystemd-network/arp-util.c
+++ /dev/null
@@ -1,154 +0,0 @@
-/***
- This file is part of systemd.
-
- Copyright (C) 2014 Axis Communications AB. All rights reserved.
- Copyright (C) 2015 Tom Gundersen
-
- 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/>.
-***/
-
-#include <linux/filter.h>
-#include <arpa/inet.h>
-
-#include "arp-util.h"
-#include "fd-util.h"
-#include "util.h"
-
-int arp_network_bind_raw_socket(int ifindex, be32_t address, const struct ether_addr *eth_mac) {
- struct sock_filter filter[] = {
- BPF_STMT(BPF_LD + BPF_W + BPF_LEN, 0), /* A <- packet length */
- BPF_JUMP(BPF_JMP + BPF_JGE + BPF_K, sizeof(struct ether_arp), 1, 0), /* packet >= arp packet ? */
- BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
- BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct ether_arp, ea_hdr.ar_hrd)), /* A <- header */
- BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ARPHRD_ETHER, 1, 0), /* header == ethernet ? */
- BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
- BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct ether_arp, ea_hdr.ar_pro)), /* A <- protocol */
- BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_IP, 1, 0), /* protocol == IP ? */
- BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
- BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(struct ether_arp, ea_hdr.ar_hln)), /* A <- hardware address length */
- BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, sizeof(struct ether_addr), 1, 0), /* length == sizeof(ether_addr)? */
- BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
- BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(struct ether_arp, ea_hdr.ar_pln)), /* A <- protocol address length */
- BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, sizeof(struct in_addr), 1, 0), /* length == sizeof(in_addr) ? */
- BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
- BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct ether_arp, ea_hdr.ar_op)), /* A <- operation */
- BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ARPOP_REQUEST, 2, 0), /* protocol == request ? */
- BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ARPOP_REPLY, 1, 0), /* protocol == reply ? */
- BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
- /* Sender Hardware Address must be different from our own */
- BPF_STMT(BPF_LD + BPF_IMM, htobe32(*((uint32_t *) eth_mac))), /* A <- 4 bytes of client's MAC */
- BPF_STMT(BPF_MISC + BPF_TAX, 0), /* X <- A */
- BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(struct ether_arp, arp_sha)), /* A <- 4 bytes of SHA */
- BPF_STMT(BPF_ALU + BPF_XOR + BPF_X, 0), /* A xor X */
- BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0, 0, 6), /* A == 0 ? */
- BPF_STMT(BPF_LD + BPF_IMM, htobe16(*((uint16_t *) (((char *) eth_mac) + 4)))), /* A <- remainder of client's MAC */
- BPF_STMT(BPF_MISC + BPF_TAX, 0), /* X <- A */
- BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(struct ether_arp, arp_sha) + 4), /* A <- remainder of SHA */
- BPF_STMT(BPF_ALU + BPF_XOR + BPF_X, 0), /* A xor X */
- BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0, 0, 1), /* A == 0 ? */
- BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
- /* Sender Protocol Address or Target Protocol Address must be equal to the one we care about*/
- BPF_STMT(BPF_LD + BPF_IMM, htobe32(address)), /* A <- clients IP */
- BPF_STMT(BPF_MISC + BPF_TAX, 0), /* X <- A */
- BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(struct ether_arp, arp_spa)), /* A <- SPA */
- BPF_STMT(BPF_ALU + BPF_XOR + BPF_X, 0), /* X xor A */
- BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0, 0, 1), /* A == 0 ? */
- BPF_STMT(BPF_RET + BPF_K, 65535), /* return all */
- BPF_STMT(BPF_LD + BPF_IMM, htobe32(address)), /* A <- clients IP */
- BPF_STMT(BPF_MISC + BPF_TAX, 0), /* X <- A */
- BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(struct ether_arp, arp_tpa)), /* A <- TPA */
- BPF_STMT(BPF_ALU + BPF_XOR + BPF_X, 0), /* X xor A */
- BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0, 0, 1), /* A == 0 ? */
- BPF_STMT(BPF_RET + BPF_K, 65535), /* return all */
- BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
- };
- struct sock_fprog fprog = {
- .len = ELEMENTSOF(filter),
- .filter = (struct sock_filter*) filter
- };
- union sockaddr_union link = {
- .ll.sll_family = AF_PACKET,
- .ll.sll_protocol = htobe16(ETH_P_ARP),
- .ll.sll_ifindex = ifindex,
- .ll.sll_halen = ETH_ALEN,
- .ll.sll_addr = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
- };
- _cleanup_close_ int s = -1;
- int r;
-
- assert(ifindex > 0);
-
- s = socket(PF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
- if (s < 0)
- return -errno;
-
- r = setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog));
- if (r < 0)
- return -errno;
-
- r = bind(s, &link.sa, sizeof(link.ll));
- if (r < 0)
- return -errno;
-
- r = s;
- s = -1;
-
- return r;
-}
-
-static int arp_send_packet(int fd, int ifindex,
- be32_t pa, const struct ether_addr *ha,
- bool announce) {
- union sockaddr_union link = {
- .ll.sll_family = AF_PACKET,
- .ll.sll_protocol = htobe16(ETH_P_ARP),
- .ll.sll_ifindex = ifindex,
- .ll.sll_halen = ETH_ALEN,
- .ll.sll_addr = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
- };
- struct ether_arp arp = {
- .ea_hdr.ar_hrd = htobe16(ARPHRD_ETHER), /* HTYPE */
- .ea_hdr.ar_pro = htobe16(ETHERTYPE_IP), /* PTYPE */
- .ea_hdr.ar_hln = ETH_ALEN, /* HLEN */
- .ea_hdr.ar_pln = sizeof(be32_t), /* PLEN */
- .ea_hdr.ar_op = htobe16(ARPOP_REQUEST), /* REQUEST */
- };
- int r;
-
- assert(fd >= 0);
- assert(pa != 0);
- assert(ha);
-
- memcpy(&arp.arp_sha, ha, ETH_ALEN);
- memcpy(&arp.arp_tpa, &pa, sizeof(pa));
-
- if (announce)
- memcpy(&arp.arp_spa, &pa, sizeof(pa));
-
- r = sendto(fd, &arp, sizeof(struct ether_arp), 0, &link.sa, sizeof(link.ll));
- if (r < 0)
- return -errno;
-
- return 0;
-}
-
-int arp_send_probe(int fd, int ifindex,
- be32_t pa, const struct ether_addr *ha) {
- return arp_send_packet(fd, ifindex, pa, ha, false);
-}
-
-int arp_send_announcement(int fd, int ifindex,
- be32_t pa, const struct ether_addr *ha) {
- return arp_send_packet(fd, ifindex, pa, ha, true);
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 12:08:08 +0000