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raw.c
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raw.c
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/**
* @file raw.c
* @note Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <errno.h>
#include <fcntl.h>
#include <linux/filter.h>
#include <linux/if_ether.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netpacket/packet.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <linux/errqueue.h>
#include <linux/net_tstamp.h>
#include <linux/sockios.h>
#include "address.h"
#include "config.h"
#include "contain.h"
#include "ether.h"
#include "missing.h"
#include "print.h"
#include "raw.h"
#include "sk.h"
#include "transport_private.h"
#include "util.h"
struct raw {
struct transport t;
struct address src_addr;
struct address ptp_addr;
struct address p2p_addr;
int vlan;
};
#define PRP_TRAILER_LEN 6
/*
* tcpdump -d \
* '((ether[12:2] == 0x8100 and ether[12 + 4 :2] == 0x88F7 and ether[14+4 :1] & 0x8 == 0x8) or '\
* ' (ether[12:2] == 0x88F7 and ether[14 :1] & 0x8 == 0x8)) and '\
* 'not ether src de:ad:de:ad:be:ef'
*
* (000) ldh [12]
* (001) jeq #0x8100 jt 2 jf 7
* (002) ldh [16]
* (003) jeq #0x88f7 jt 4 jf 16
* (004) ldb [18]
* (005) and #0x8
* (006) jeq #0x8 jt 11 jf 16
* (007) jeq #0x88f7 jt 8 jf 16
* (008) ldb [14]
* (009) and #0x8
* (010) jeq #0x8 jt 11 jf 16
* (011) ld [8]
* (012) jeq #0xdeadbeef jt 13 jf 15
* (013) ldh [6]
* (014) jeq #0xdead jt 16 jf 15
* (015) ret #262144
* (016) ret #0
*/
static struct sock_filter raw_filter_vlan_norm_general[] = {
{ 0x28, 0, 0, 0x0000000c },
{ 0x15, 0, 5, 0x00008100 },
{ 0x28, 0, 0, 0x00000010 },
{ 0x15, 0, 12, 0x000088f7 },
{ 0x30, 0, 0, 0x00000012 },
{ 0x54, 0, 0, 0x00000008 },
{ 0x15, 4, 9, 0x00000008 },
{ 0x15, 0, 8, 0x000088f7 },
{ 0x30, 0, 0, 0x0000000e },
{ 0x54, 0, 0, 0x00000008 },
{ 0x15, 0, 5, 0x00000008 },
{ 0x20, 0, 0, 0x00000008 },
{ 0x15, 0, 2, 0xdeadbeef },
{ 0x28, 0, 0, 0x00000006 },
{ 0x15, 1, 0, 0x0000dead },
{ 0x6, 0, 0, 0x00040000 },
{ 0x6, 0, 0, 0x00000000 },
};
#define FILTER_EVENT_POS_SRC0 14
#define FILTER_EVENT_POS_SRC2 12
/*
* tcpdump -d \
* '((ether[12:2] == 0x8100 and ether[12 + 4 :2] == 0x88F7 and ether[14+4 :1] & 0x8 != 0x8) or '\
* ' (ether[12:2] == 0x88F7 and ether[14 :1] & 0x8 != 0x8)) and '\
* 'not ether src de:ad:de:ad:be:ef'
*
* (000) ldh [12]
* (001) jeq #0x8100 jt 2 jf 7
* (002) ldh [16]
* (003) jeq #0x88f7 jt 4 jf 16
* (004) ldb [18]
* (005) and #0x8
* (006) jeq #0x8 jt 16 jf 11
* (007) jeq #0x88f7 jt 8 jf 16
* (008) ldb [14]
* (009) and #0x8
* (010) jeq #0x8 jt 16 jf 11
* (011) ld [8]
* (012) jeq #0xdeadbeef jt 13 jf 15
* (013) ldh [6]
* (014) jeq #0xdead jt 16 jf 15
* (015) ret #262144
* (016) ret #0
*/
static struct sock_filter raw_filter_vlan_norm_event[] = {
{ 0x28, 0, 0, 0x0000000c },
{ 0x15, 0, 5, 0x00008100 },
{ 0x28, 0, 0, 0x00000010 },
{ 0x15, 0, 12, 0x000088f7 },
{ 0x30, 0, 0, 0x00000012 },
{ 0x54, 0, 0, 0x00000008 },
{ 0x15, 9, 4, 0x00000008 },
{ 0x15, 0, 8, 0x000088f7 },
{ 0x30, 0, 0, 0x0000000e },
{ 0x54, 0, 0, 0x00000008 },
{ 0x15, 5, 0, 0x00000008 },
{ 0x20, 0, 0, 0x00000008 },
{ 0x15, 0, 2, 0xdeadbeef },
{ 0x28, 0, 0, 0x00000006 },
{ 0x15, 1, 0, 0x0000dead },
{ 0x6, 0, 0, 0x00040000 },
{ 0x6, 0, 0, 0x00000000 },
};
#define FILTER_GENERAL_POS_SRC0 14
#define FILTER_GENERAL_POS_SRC2 12
static int raw_configure(int fd, int event, int index,
unsigned char *local_addr, unsigned char *addr1,
unsigned char *addr2, int enable)
{
int err1, err2, option;
struct packet_mreq mreq;
struct sock_fprog prg;
if (event) {
prg.len = ARRAY_SIZE(raw_filter_vlan_norm_event);
prg.filter = raw_filter_vlan_norm_event;
memcpy(&prg.filter[FILTER_EVENT_POS_SRC0].k, local_addr, 2);
memcpy(&prg.filter[FILTER_EVENT_POS_SRC2].k, local_addr + 2, 4);
prg.filter[FILTER_EVENT_POS_SRC0].k =
ntohs(prg.filter[FILTER_EVENT_POS_SRC0].k);
prg.filter[FILTER_EVENT_POS_SRC2].k =
ntohl(prg.filter[FILTER_EVENT_POS_SRC2].k);
} else {
prg.len = ARRAY_SIZE(raw_filter_vlan_norm_general);
prg.filter = raw_filter_vlan_norm_general;
memcpy(&prg.filter[FILTER_GENERAL_POS_SRC0].k, local_addr, 2);
memcpy(&prg.filter[FILTER_GENERAL_POS_SRC2].k, local_addr + 2, 4);
prg.filter[FILTER_GENERAL_POS_SRC0].k =
ntohs(prg.filter[FILTER_GENERAL_POS_SRC0].k);
prg.filter[FILTER_GENERAL_POS_SRC2].k =
ntohl(prg.filter[FILTER_GENERAL_POS_SRC2].k);
}
if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &prg, sizeof(prg))) {
pr_err("setsockopt SO_ATTACH_FILTER failed: %m");
return -1;
}
option = enable ? PACKET_ADD_MEMBERSHIP : PACKET_DROP_MEMBERSHIP;
memset(&mreq, 0, sizeof(mreq));
mreq.mr_ifindex = index;
mreq.mr_type = PACKET_MR_MULTICAST;
mreq.mr_alen = MAC_LEN;
memcpy(mreq.mr_address, addr1, MAC_LEN);
err1 = setsockopt(fd, SOL_PACKET, option, &mreq, sizeof(mreq));
if (err1)
pr_warning("setsockopt PACKET_MR_MULTICAST failed: %m");
memcpy(mreq.mr_address, addr2, MAC_LEN);
err2 = setsockopt(fd, SOL_PACKET, option, &mreq, sizeof(mreq));
if (err2)
pr_warning("setsockopt PACKET_MR_MULTICAST failed: %m");
if (!err1 && !err2)
return 0;
mreq.mr_ifindex = index;
mreq.mr_type = PACKET_MR_ALLMULTI;
mreq.mr_alen = 0;
if (!setsockopt(fd, SOL_PACKET, option, &mreq, sizeof(mreq))) {
return 0;
}
pr_warning("setsockopt PACKET_MR_ALLMULTI failed: %m");
mreq.mr_ifindex = index;
mreq.mr_type = PACKET_MR_PROMISC;
mreq.mr_alen = 0;
if (!setsockopt(fd, SOL_PACKET, option, &mreq, sizeof(mreq))) {
return 0;
}
pr_warning("setsockopt PACKET_MR_PROMISC failed: %m");
pr_err("all socket options failed");
return -1;
}
static int raw_close(struct transport *t, struct fdarray *fda)
{
close(fda->fd[0]);
close(fda->fd[1]);
return 0;
}
static int open_socket(const char *name, int event, unsigned char *local_addr,
unsigned char *ptp_dst_mac, unsigned char *p2p_dst_mac,
int socket_priority)
{
struct sockaddr_ll addr;
int fd, index;
fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (fd < 0) {
pr_err("socket failed: %m");
goto no_socket;
}
index = sk_interface_index(fd, name);
if (index < 0)
goto no_option;
memset(&addr, 0, sizeof(addr));
addr.sll_ifindex = index;
addr.sll_family = AF_PACKET;
addr.sll_protocol = htons(ETH_P_ALL);
if (bind(fd, (struct sockaddr *) &addr, sizeof(addr))) {
pr_err("bind failed: %m");
goto no_option;
}
if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, name, strlen(name))) {
pr_err("setsockopt SO_BINDTODEVICE failed: %m");
goto no_option;
}
if (socket_priority > 0 &&
setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &socket_priority,
sizeof(socket_priority))) {
pr_err("setsockopt SO_PRIORITY failed: %m");
goto no_option;
}
if (raw_configure(fd, event, index, local_addr, ptp_dst_mac,
p2p_dst_mac, 1))
goto no_option;
return fd;
no_option:
close(fd);
no_socket:
return -1;
}
static void mac_to_addr(struct address *addr, void *mac)
{
addr->sll.sll_family = AF_PACKET;
addr->sll.sll_halen = MAC_LEN;
memcpy(addr->sll.sll_addr, mac, MAC_LEN);
addr->len = sizeof(addr->sll);
}
static void addr_to_mac(void *mac, struct address *addr)
{
memcpy(mac, &addr->sll.sll_addr, MAC_LEN);
}
/* Determines if the packet has Parallel Redundancy Protocol (PRP) trailer. */
static bool has_prp_trailer(unsigned char *ptr, int cnt)
{
unsigned short suffix_id, lane_size_field, lsdu_size;
int ptp_msg_len, trailer_start;
struct ptp_header *hdr;
/* try to parse like a PTP message to find out the message length */
if (cnt < sizeof(struct ptp_header))
return false;
hdr = (struct ptp_header *)ptr;
if ((hdr->ver & MAJOR_VERSION_MASK) != PTP_MAJOR_VERSION)
return false;
ptp_msg_len = ntohs(hdr->messageLength);
if (cnt < (ptp_msg_len + PRP_TRAILER_LEN))
return false;
/* PRP trailer is always in the last six bytes before the FCS */
trailer_start = cnt - PRP_TRAILER_LEN;
/* PRP trailer (RCT) consists of 3 uint16.
| -------------------------------------------------------- |
| SeqNr(0-15) | LanId(0-3) LSDUsize(4-15) | Suffix (0-15) |
| -------------------------------------------------------- |
- Sequence number is a running number and can't be verified
- LanId should be 0x1010 or 0x1011 (but should not be used for verification)
- LSDUsize should match LSDU length
(including possible padding and the RCT itself)
- Suffix should be 0x88FB
*/
/* Verify that the size in the RCT matches.
Size is the lower 12 bits
*/
lane_size_field = ntohs(*(unsigned short*)(ptr + trailer_start + 2));
lsdu_size = lane_size_field & 0x0FFF;
if (lsdu_size != cnt)
return false;
/* Verify the suffix */
suffix_id = ntohs(*(unsigned short*)(ptr + trailer_start + 4));
if (suffix_id == ETH_P_PRP)
{
return true;
}
return false;
}
static int raw_open(struct transport *t, struct interface *iface,
struct fdarray *fda, enum timestamp_type ts_type)
{
struct raw *raw = container_of(t, struct raw, t);
unsigned char ptp_dst_mac[MAC_LEN];
unsigned char p2p_dst_mac[MAC_LEN];
int efd, gfd, socket_priority;
const char *name;
char *str;
name = interface_label(iface);
str = config_get_string(t->cfg, name, "ptp_dst_mac");
if (str2mac(str, ptp_dst_mac)) {
pr_err("invalid ptp_dst_mac %s", str);
return -1;
}
str = config_get_string(t->cfg, name, "p2p_dst_mac");
if (str2mac(str, p2p_dst_mac)) {
pr_err("invalid p2p_dst_mac %s", str);
return -1;
}
mac_to_addr(&raw->ptp_addr, ptp_dst_mac);
mac_to_addr(&raw->p2p_addr, p2p_dst_mac);
if (sk_interface_macaddr(name, &raw->src_addr))
goto no_mac;
socket_priority = config_get_int(t->cfg, "global", "socket_priority");
efd = open_socket(name, 1, raw->src_addr.sll.sll_addr, ptp_dst_mac,
p2p_dst_mac, socket_priority);
if (efd < 0)
goto no_event;
gfd = open_socket(name, 0, raw->src_addr.sll.sll_addr, p2p_dst_mac,
p2p_dst_mac, socket_priority);
if (gfd < 0)
goto no_general;
if (sk_timestamping_init(efd, name, ts_type, TRANS_IEEE_802_3,
interface_get_vclock(iface)))
goto no_timestamping;
if (sk_general_init(gfd))
goto no_timestamping;
fda->fd[FD_EVENT] = efd;
fda->fd[FD_GENERAL] = gfd;
return 0;
no_timestamping:
close(gfd);
no_general:
close(efd);
no_event:
no_mac:
return -1;
}
static int raw_recv(struct transport *t, int fd, void *buf, int buflen,
struct address *addr, struct hw_timestamp *hwts)
{
struct raw *raw = container_of(t, struct raw, t);
unsigned char *ptr = buf;
struct eth_hdr *hdr;
int cnt, hlen;
if (raw->vlan) {
hlen = sizeof(struct vlan_hdr);
} else {
hlen = sizeof(struct eth_hdr);
}
ptr -= hlen;
buflen += hlen;
hdr = (struct eth_hdr *) ptr;
cnt = sk_receive(fd, ptr, buflen, addr, hwts, MSG_DONTWAIT);
if (cnt >= 0)
cnt -= hlen;
if (cnt < 0)
return cnt;
if (has_prp_trailer(buf, cnt))
cnt -= PRP_TRAILER_LEN;
if (raw->vlan) {
if (ETH_P_1588 == ntohs(hdr->type)) {
pr_notice("raw: disabling VLAN mode");
raw->vlan = 0;
}
} else {
if (ETH_P_8021Q == ntohs(hdr->type)) {
pr_notice("raw: switching to VLAN mode");
raw->vlan = 1;
}
}
return cnt;
}
static int raw_send(struct transport *t, struct fdarray *fda,
enum transport_event event, int peer, void *buf, int len,
struct address *addr, struct hw_timestamp *hwts)
{
struct raw *raw = container_of(t, struct raw, t);
ssize_t cnt;
unsigned char pkt[1600], *ptr = buf;
struct eth_hdr *hdr;
int fd = -1;
switch (event) {
case TRANS_GENERAL:
fd = fda->fd[FD_GENERAL];
break;
case TRANS_EVENT:
case TRANS_ONESTEP:
case TRANS_P2P1STEP:
case TRANS_DEFER_EVENT:
fd = fda->fd[FD_EVENT];
break;
}
ptr -= sizeof(*hdr);
len += sizeof(*hdr);
if (!addr)
addr = peer ? &raw->p2p_addr : &raw->ptp_addr;
hdr = (struct eth_hdr *) ptr;
addr_to_mac(&hdr->dst, addr);
addr_to_mac(&hdr->src, &raw->src_addr);
hdr->type = htons(ETH_P_1588);
cnt = send(fd, ptr, len, 0);
if (cnt < 1) {
return -errno;
}
/*
* Get the time stamp right away.
*/
return event == TRANS_EVENT ? sk_receive(fd, pkt, len, NULL, hwts, MSG_ERRQUEUE) : cnt;
}
static void raw_release(struct transport *t)
{
struct raw *raw = container_of(t, struct raw, t);
free(raw);
}
static int raw_physical_addr(struct transport *t, uint8_t *addr)
{
struct raw *raw = container_of(t, struct raw, t);
addr_to_mac(addr, &raw->src_addr);
return MAC_LEN;
}
static int raw_protocol_addr(struct transport *t, uint8_t *addr)
{
struct raw *raw = container_of(t, struct raw, t);
addr_to_mac(addr, &raw->src_addr);
return MAC_LEN;
}
struct transport *raw_transport_create(void)
{
struct raw *raw;
raw = calloc(1, sizeof(*raw));
if (!raw)
return NULL;
raw->t.close = raw_close;
raw->t.open = raw_open;
raw->t.recv = raw_recv;
raw->t.send = raw_send;
raw->t.release = raw_release;
raw->t.physical_addr = raw_physical_addr;
raw->t.protocol_addr = raw_protocol_addr;
return &raw->t;
}