#include "bfd.h"
-/*
- * Definitions
- */
-struct bfd_raw_echo_pkt {
-#ifdef BFD_LINUX
- struct iphdr ip;
-#endif /* BFD_LINUX */
-#ifdef BFD_BSD
- struct ip ip;
-#endif /* BFD_BSD */
- struct udphdr udp;
- struct bfd_echo_pkt data;
-};
-
-#define IP_ECHO_PKT_LEN (IP_HDR_LEN + UDP_HDR_LEN + BFD_ECHO_PKT_LEN)
-#define UDP_ECHO_PKT_LEN (UDP_HDR_LEN + BFD_ECHO_PKT_LEN)
-
/*
* Prototypes
*/
-static uint16_t ptm_bfd_gen_IP_ID(struct bfd_session *bfd);
-static void ptm_bfd_echo_pkt_create(struct bfd_session *bfd);
-static int ptm_bfd_echo_loopback(uint8_t *pkt, int pkt_len, struct sockaddr *ss,
- socklen_t sslen);
static int ptm_bfd_process_echo_pkt(int s);
+int _ptm_bfd_send(struct bfd_session *bs, uint16_t *port, const void *data,
+ size_t datalen);
static void bfd_sd_reschedule(int sd);
ssize_t bfd_recv_ipv4(int sd, uint8_t *msgbuf, size_t msgbuflen, uint8_t *ttl,
char *port, size_t portlen, char *vrfname,
size_t vrfnamelen, struct sockaddr_any *local,
struct sockaddr_any *peer);
+int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen,
+ struct sockaddr *to, socklen_t tolen);
+int bp_bfd_echo_in(int sd, uint8_t *ttl, uint32_t *my_discr);
/* socket related prototypes */
static void bp_set_ipopts(int sd);
/*
* Functions
*/
-uint16_t checksum(uint16_t *buf, int len)
-{
- int nbytes = len;
- int sum = 0;
- uint16_t csum = 0;
- int size = sizeof(uint16_t);
-
- while (nbytes > 1) {
- sum += *buf++;
- nbytes -= size;
- }
-
- if (nbytes == 1) {
- *(uint8_t *)(&csum) = *(uint8_t *)buf;
- sum += csum;
- }
-
- sum = (sum >> 16) + (sum & 0xFFFF);
- sum += (sum >> 16);
- csum = ~sum;
- return csum;
-}
-
-static uint16_t ptm_bfd_gen_IP_ID(struct bfd_session *bfd)
-{
- return (++bfd->ip_id);
-}
-
-static int _ptm_bfd_send(struct bfd_session *bs, bool use_layer2,
- uint16_t *port, const void *data, size_t datalen)
+int _ptm_bfd_send(struct bfd_session *bs, uint16_t *port, const void *data,
+ size_t datalen)
{
struct sockaddr *sa;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
-#ifdef BFD_LINUX
- struct sockaddr_ll dll;
-#endif /* BFD_LINUX */
socklen_t slen;
ssize_t rv;
int sd = -1;
- if (use_layer2) {
-#ifdef BFD_LINUX
- memset(&dll, 0, sizeof(dll));
- dll.sll_family = AF_PACKET;
- dll.sll_protocol = htons(ETH_P_IP);
- memcpy(dll.sll_addr, bs->peer_mac, ETHERNET_ADDRESS_LENGTH);
- dll.sll_halen = htons(ETHERNET_ADDRESS_LENGTH);
- dll.sll_ifindex = bs->ifindex;
-
- sd = bglobal.bg_echo;
- sa = (struct sockaddr *)&dll;
- slen = sizeof(dll);
-#else
- /* TODO: implement layer 2 send for *BSDs. */
- log_warning("packet-send: not implemented");
- return -1;
-#endif
- } else if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_IPV6)) {
+ if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_IPV6)) {
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_addr = bs->shop.peer.sa_sin6.sin6_addr;
return 0;
}
-static void ptm_bfd_echo_pkt_create(struct bfd_session *bfd)
-{
- struct bfd_raw_echo_pkt ep;
- uint8_t *pkt = bfd->echo_pkt;
-
- memset(&ep, 0, sizeof(ep));
- memset(bfd->echo_pkt, 0, sizeof(bfd->echo_pkt));
-
- /* Construct ethernet header information */
- memcpy(pkt, bfd->peer_mac, ETHERNET_ADDRESS_LENGTH);
- pkt = pkt + ETHERNET_ADDRESS_LENGTH;
- memcpy(pkt, bfd->local_mac, ETHERNET_ADDRESS_LENGTH);
- pkt = pkt + ETHERNET_ADDRESS_LENGTH;
-#ifdef BFD_LINUX
- pkt[0] = ETH_P_IP / 256;
- pkt[1] = ETH_P_IP % 256;
-#endif /* BFD_LINUX */
-#ifdef BFD_BSD
- pkt[0] = ETHERTYPE_IP / 256;
- pkt[1] = ETHERTYPE_IP % 256;
-#endif /* BFD_BSD */
- pkt += 2;
-
- /* Construct IP header information */
-#ifdef BFD_LINUX
- ep.ip.version = 4;
- ep.ip.ihl = 5;
- ep.ip.tos = 0;
- ep.ip.tot_len = htons(IP_ECHO_PKT_LEN);
- ep.ip.id = htons(ptm_bfd_gen_IP_ID(bfd));
- ep.ip.frag_off = 0;
- ep.ip.ttl = BFD_TTL_VAL;
- ep.ip.protocol = IPPROTO_UDP;
- ep.ip.saddr = bfd->local_ip.sa_sin.sin_addr.s_addr;
- ep.ip.daddr = bfd->shop.peer.sa_sin.sin_addr.s_addr;
- ep.ip.check = checksum((uint16_t *)&ep.ip, IP_HDR_LEN);
-#endif /* BFD_LINUX */
-#ifdef BFD_BSD
- ep.ip.ip_v = 4;
- ep.ip.ip_hl = 5;
- ep.ip.ip_tos = 0;
- ep.ip.ip_len = htons(IP_ECHO_PKT_LEN);
- ep.ip.ip_id = htons(ptm_bfd_gen_IP_ID(bfd));
- ep.ip.ip_off = 0;
- ep.ip.ip_ttl = BFD_TTL_VAL;
- ep.ip.ip_p = IPPROTO_UDP;
- ep.ip.ip_src = bfd->local_ip.sa_sin.sin_addr;
- ep.ip.ip_dst = bfd->shop.peer.sa_sin.sin_addr;
- ep.ip.ip_sum = checksum((uint16_t *)&ep.ip, IP_HDR_LEN);
-#endif /* BFD_BSD */
-
- /* Construct UDP header information */
-#ifdef BFD_LINUX
- ep.udp.source = htons(BFD_DEF_ECHO_PORT);
- ep.udp.dest = htons(BFD_DEF_ECHO_PORT);
- ep.udp.len = htons(UDP_ECHO_PKT_LEN);
-#endif /* BFD_LINUX */
-#ifdef BFD_BSD
- ep.udp.uh_sport = htons(BFD_DEF_ECHO_PORT);
- ep.udp.uh_dport = htons(BFD_DEF_ECHO_PORT);
- ep.udp.uh_ulen = htons(UDP_ECHO_PKT_LEN);
-#endif /* BFD_BSD */
-
- /* Construct Echo packet information */
- ep.data.ver = BFD_ECHO_VERSION;
- ep.data.len = BFD_ECHO_PKT_LEN;
- ep.data.my_discr = htonl(bfd->discrs.my_discr);
-#ifdef BFD_LINUX
- ep.udp.check =
-#endif /* BFD_LINUX */
-#ifdef BFD_BSD
- ep.udp.uh_sum =
-#endif /* BFD_BSD */
- udp4_checksum(&ep.ip, (uint8_t *)&ep.udp,
- UDP_ECHO_PKT_LEN);
-
- memcpy(pkt, &ep, sizeof(ep));
-}
-
void ptm_bfd_echo_snd(struct bfd_session *bfd)
{
- struct bfd_raw_echo_pkt *ep;
- bool use_layer2 = false;
- const void *pkt;
- size_t pktlen;
- uint16_t port = htons(BFD_DEF_ECHO_PORT);
+ struct sockaddr_any *sa;
+ socklen_t salen;
+ int sd;
+ struct bfd_echo_pkt bep;
+ struct sockaddr_in sin;
+ struct sockaddr_in6 sin6;
- if (!BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) {
- ptm_bfd_echo_pkt_create(bfd);
+ if (!BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE))
BFD_SET_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE);
- } else {
- /* just update the checksum and ip Id */
- ep = (struct bfd_raw_echo_pkt *)(bfd->echo_pkt + ETH_HDR_LEN);
-#ifdef BFD_LINUX
- ep->ip.id = htons(ptm_bfd_gen_IP_ID(bfd));
- ep->ip.check = 0;
- ep->ip.check = checksum((uint16_t *)&ep->ip, IP_HDR_LEN);
-#endif /* BFD_LINUX */
-#ifdef BFD_BSD
- ep->ip.ip_id = htons(ptm_bfd_gen_IP_ID(bfd));
- ep->ip.ip_sum = 0;
- ep->ip.ip_sum = checksum((uint16_t *)&ep->ip, IP_HDR_LEN);
-#endif /* BFD_BSD */
- }
- if (use_layer2) {
- pkt = bfd->echo_pkt;
- pktlen = BFD_ECHO_PKT_TOT_LEN;
+ memset(&bep, 0, sizeof(bep));
+ bep.ver = BFD_ECHO_VERSION;
+ bep.len = BFD_ECHO_PKT_LEN;
+ bep.my_discr = htonl(bfd->discrs.my_discr);
+
+ sa = BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_MH) ? &bfd->mhop.peer
+ : &bfd->shop.peer;
+ if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_IPV6)) {
+ sd = bglobal.bg_echov6;
+ sin6 = sa->sa_sin6;
+ sin6.sin6_port = htons(BFD_DEF_ECHO_PORT);
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+ sin6.sin6_len = sizeof(sin6);
+#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
+
+ sa = (struct sockaddr_any *)&sin6;
+ salen = sizeof(sin6);
} else {
- pkt = &bfd->echo_pkt[ETH_HDR_LEN + IP_HDR_LEN + UDP_HDR_LEN];
- pktlen = BFD_ECHO_PKT_TOT_LEN
- - (ETH_HDR_LEN + IP_HDR_LEN + UDP_HDR_LEN);
- }
+ sd = bglobal.bg_echo;
+ sin = sa->sa_sin;
+ sin.sin_port = htons(BFD_DEF_ECHO_PORT);
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+ sin.sin_len = sizeof(sin);
+#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
- if (_ptm_bfd_send(bfd, use_layer2, &port, pkt, pktlen) != 0) {
- log_debug("echo-packet: send failure: %s", strerror(errno));
- return;
+ sa = (struct sockaddr_any *)&sin;
+ salen = sizeof(sin);
}
+ if (bp_udp_send(sd, BFD_TTL_VAL, (uint8_t *)&bep, sizeof(bep),
+ (struct sockaddr *)sa, salen)
+ == -1)
+ return;
bfd->stats.tx_echo_pkt++;
}
-static int ptm_bfd_echo_loopback(uint8_t *pkt, int pkt_len, struct sockaddr *ss,
- socklen_t sslen)
-{
-#ifdef BFD_LINUX
- struct bfd_raw_echo_pkt *ep =
- (struct bfd_raw_echo_pkt *)(pkt + ETH_HDR_LEN);
- uint8_t temp_mac[ETHERNET_ADDRESS_LENGTH];
- uint32_t temp_ip;
- struct ethhdr *eth = (struct ethhdr *)pkt;
-
- /* swap the mac addresses */
- memcpy(temp_mac, eth->h_source, ETHERNET_ADDRESS_LENGTH);
- memcpy(eth->h_source, eth->h_dest, ETHERNET_ADDRESS_LENGTH);
- memcpy(eth->h_dest, temp_mac, ETHERNET_ADDRESS_LENGTH);
-
- /* swap ip addresses */
- temp_ip = ep->ip.saddr;
- ep->ip.saddr = ep->ip.daddr;
- ep->ip.daddr = temp_ip;
-
- ep->ip.ttl = ep->ip.ttl - 1;
- ep->ip.check = 0;
- ep->ip.check = checksum((uint16_t *)ep, IP_HDR_LEN);
-#endif /* BFD_LINUX */
-#ifdef BFD_BSD_FILTER
- struct bfd_raw_echo_pkt_t *ep =
- (struct bfd_raw_echo_pkt *)(pkt + ETH_HDR_LEN);
- uint8_t temp_mac[ETHERNET_ADDRESS_LENGTH];
- struct in_addr temp_ip;
- struct ether_header *ether = (struct ether_header *)pkt;
-
- /*
- * TODO: this is not yet implemented and requires BPF code for
- * OmniOS, NetBSD and FreeBSD9.
- */
-
- /* swap the mac addresses */
- memcpy(temp_mac, ether->ether_shost, ETHERNET_ADDRESS_LENGTH);
- memcpy(ether->ether_shost, ether->ether_dhost, ETHERNET_ADDRESS_LENGTH);
- memcpy(ether->ether_dhost, temp_mac, ETHERNET_ADDRESS_LENGTH);
-
- /* swap ip addresses */
- temp_ip = ep->ip.ip_src;
- ep->ip.ip_src = ep->ip.ip_dst;
- ep->ip.ip_dst = temp_ip;
-
- ep->ip.ip_ttl = ep->ip.ip_ttl - 1;
- ep->ip.ip_sum = 0;
- ep->ip.ip_sum = checksum((uint16_t *)ep, IP_HDR_LEN);
-#endif /* BFD_BSD_FILTER */
-
- if (sendto(bglobal.bg_echo, pkt, pkt_len, 0, ss, sslen) < 0) {
- log_debug("echo-loopback: send failure: %s", strerror(errno));
- return -1;
- }
-
- return 0;
-}
-
static int ptm_bfd_process_echo_pkt(int s)
{
- uint32_t my_discr = 0;
- struct sockaddr_storage ss;
- socklen_t sslen = sizeof(ss);
- uint8_t rx_pkt[BFD_RX_BUF_LEN];
- ssize_t pkt_len = sizeof(rx_pkt);
struct bfd_session *bfd;
-#ifdef BFD_LINUX
- struct bfd_raw_echo_pkt *ep;
-
- /*
- * valgrind: memset() ss so valgrind doesn't complain about
- * uninitialized memory.
- */
- memset(&ss, 0, sizeof(ss));
- pkt_len = recvfrom(s, rx_pkt, sizeof(rx_pkt), MSG_DONTWAIT,
- (struct sockaddr *)&ss, &sslen);
- if (pkt_len <= 0) {
- if (errno != EAGAIN)
- log_error("echo-packet: read failure: %s",
- strerror(errno));
-
- return -1;
- }
-
- /* Check if we have at least the basic headers to send back. */
- if (pkt_len < BFD_ECHO_PKT_TOT_LEN) {
- log_debug("echo-packet: too short (got %ld, expected %d)",
- pkt_len, BFD_ECHO_PKT_TOT_LEN);
- return -1;
- }
-
- ep = (struct bfd_raw_echo_pkt *)(rx_pkt + ETH_HDR_LEN);
- /* if TTL = 255, assume that the received echo packet has
- * to be looped back
- */
- if (ep->ip.ttl == BFD_TTL_VAL)
- return ptm_bfd_echo_loopback(rx_pkt, pkt_len,
- (struct sockaddr *)&ss,
- sizeof(struct sockaddr_ll));
-
- my_discr = ntohl(ep->data.my_discr);
- if (ep->data.my_discr == 0) {
- log_debug("echo-packet: 'my discriminator' is zero");
- return -1;
- }
-#endif /* BFD_LINUX */
-#ifdef BFD_BSD
- int rv;
- uint8_t ttl;
-
- /*
- * bsd_echo_sock_read() already treats invalid TTL values and
- * zeroed discriminators.
- */
- rv = bsd_echo_sock_read(s, rx_pkt, &pkt_len, &ss, &sslen, &ttl,
- &my_discr);
- if (rv == -1)
- return -1;
+ uint32_t my_discr = 0;
+ uint8_t ttl = 0;
- if (ttl == BFD_TTL_VAL)
- return ptm_bfd_echo_loopback(rx_pkt, pkt_len,
- (struct sockaddr *)&ss, sslen);
-#endif /* BFD_BSD */
+ /* Receive and parse echo packet. */
+ if (bp_bfd_echo_in(s, &ttl, &my_discr) == -1)
+ return 0;
/* Your discriminator not zero - use it to find session */
bfd = bfd_id_lookup(my_discr);
}
cp.timers.required_min_echo = htonl(bfd->timers.required_min_echo);
- if (_ptm_bfd_send(bfd, false, NULL, &cp, BFD_PKT_LEN) != 0)
+ if (_ptm_bfd_send(bfd, NULL, &cp, BFD_PKT_LEN) != 0)
return;
bfd->stats.tx_ctrl_pkt++;
bglobal.bg_ev[4] = NULL;
thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echo,
&bglobal.bg_ev[4]);
+ } else if (sd == bglobal.bg_echov6) {
+ bglobal.bg_ev[5] = NULL;
+ thread_add_read(master, bfd_recv_cb, NULL, bglobal.bg_echov6,
+ &bglobal.bg_ev[5]);
}
}
bfd_sd_reschedule(sd);
/* Handle echo packets. */
- if (sd == bglobal.bg_echo) {
+ if (sd == bglobal.bg_echo || sd == bglobal.bg_echov6) {
ptm_bfd_process_echo_pkt(sd);
return 0;
}
return 0;
}
+/*
+ * bp_bfd_echo_in: proccesses an BFD echo packet. On TTL == BFD_TTL_VAL
+ * the packet is looped back or returns the my discriminator ID along
+ * with the TTL.
+ *
+ * Returns -1 on error or loopback or 0 on success.
+ */
+int bp_bfd_echo_in(int sd, uint8_t *ttl, uint32_t *my_discr)
+{
+ struct bfd_echo_pkt *bep;
+ ssize_t rlen;
+ struct sockaddr_any local, peer;
+ char port[MAXNAMELEN + 1], vrfname[MAXNAMELEN + 1];
+ uint8_t msgbuf[1516];
+
+ if (sd == bglobal.bg_echo)
+ rlen = bfd_recv_ipv4(sd, msgbuf, sizeof(msgbuf), ttl, port,
+ sizeof(port), vrfname, sizeof(vrfname),
+ &local, &peer);
+ else
+ rlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), ttl, port,
+ sizeof(port), vrfname, sizeof(vrfname),
+ &local, &peer);
+
+ /* Short packet, better not risk reading it. */
+ if (rlen < (ssize_t)sizeof(*bep)) {
+ cp_debug(false, &peer, &local, port, vrfname,
+ "small echo packet");
+ return -1;
+ }
+
+ /* Test for loopback. */
+ if (*ttl == BFD_TTL_VAL) {
+ bp_udp_send(sd, *ttl - 1, msgbuf, rlen,
+ (struct sockaddr *)&peer,
+ (sd == bglobal.bg_echo) ? sizeof(peer.sa_sin)
+ : sizeof(peer.sa_sin6));
+ return -1;
+ }
+
+ /* Read my discriminator from BFD Echo packet. */
+ bep = (struct bfd_echo_pkt *)msgbuf;
+ *my_discr = ntohl(bep->my_discr);
+ if (*my_discr == 0) {
+ cp_debug(false, &peer, &local, port, vrfname,
+ "invalid echo packet discriminator (zero)");
+ return -1;
+ }
+
+ return 0;
+}
+
+int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen,
+ struct sockaddr *to, socklen_t tolen)
+{
+ struct cmsghdr *cmsg;
+ ssize_t wlen;
+ int ttlval = ttl;
+ bool is_ipv6 = to->sa_family == AF_INET6;
+ struct msghdr msg;
+ struct iovec iov[1];
+ uint8_t msgctl[255];
+
+ /* Prepare message data. */
+ iov[0].iov_base = data;
+ iov[0].iov_len = datalen;
+
+ memset(&msg, 0, sizeof(msg));
+ memset(msgctl, 0, sizeof(msgctl));
+ msg.msg_name = to;
+ msg.msg_namelen = tolen;
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+
+ /* Prepare the packet TTL information. */
+ if (ttl > 0) {
+ /* Use ancillary data. */
+ msg.msg_control = msgctl;
+ msg.msg_controllen = CMSG_LEN(sizeof(ttlval));
+
+ /* Configure the ancillary data. */
+ cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_len = CMSG_LEN(sizeof(ttlval));
+ if (is_ipv6) {
+ cmsg->cmsg_level = IPPROTO_IPV6;
+ cmsg->cmsg_type = IPV6_HOPLIMIT;
+ } else {
+#if BFD_LINUX
+ cmsg->cmsg_level = IPPROTO_IP;
+ cmsg->cmsg_type = IP_TTL;
+#else
+ /* FreeBSD does not support TTL in ancillary data. */
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+
+ bp_set_ttl(sd, ttl);
+#endif /* BFD_BSD */
+ }
+ memcpy(CMSG_DATA(cmsg), &ttlval, sizeof(ttlval));
+ }
+
+ /* Send echo back. */
+ wlen = sendmsg(sd, &msg, 0);
+ if (wlen <= 0) {
+ log_debug("udp-send: loopback failure: (%d) %s", errno, strerror(errno));
+ return -1;
+ } else if (wlen < (ssize_t)datalen) {
+ log_debug("udp-send: partial send: %ld expected %ld", wlen,
+ datalen);
+ return -1;
+ }
+
+ return 0;
+}
+
/*
* Sockets creation.
return sd;
}
+
+int bp_echo_socket(void)
+{
+ int s;
+
+ s = socket(AF_INET, SOCK_DGRAM, 0);
+ if (s == -1)
+ log_fatal("echo-socket: socket: %s", strerror(errno));
+
+ bp_set_ipopts(s);
+ bp_bind_ip(s, BFD_DEF_ECHO_PORT);
+
+ return s;
+}
+
+int bp_echov6_socket(void)
+{
+ int s;
+
+ s = socket(AF_INET6, SOCK_DGRAM, 0);
+ if (s == -1)
+ log_fatal("echov6-socket: socket: %s", strerror(errno));
+
+ bp_set_ipv6opts(s);
+ bp_bind_ipv6(s, BFD_DEF_ECHO_PORT);
+
+ return s;
+}
#include "bfd.h"
-/*
- * Prototypes
- */
-static const char *sockaddr_to_string(const void *sv, char *buf, size_t buflen);
-
/*
* Definitions.
*/
-static const char *sockaddr_to_string(const void *sv, char *buf, size_t buflen)
-{
- const struct sockaddr *sa = sv;
- const struct sockaddr_in *sin = sv;
- const struct sockaddr_in6 *sin6 = sv;
- int unknown = 1;
-
- switch (sa->sa_family) {
- case AF_INET:
- if (inet_ntop(AF_INET, &sin->sin_addr, buf, buflen) != NULL)
- unknown = 0;
- break;
-
- case AF_INET6:
- if (inet_ntop(AF_INET6, &sin6->sin6_addr, buf, buflen) != NULL)
- unknown = 0;
- break;
- }
- if (unknown == 0)
- return buf;
-
- snprintf(buf, buflen, "unknown (af=%d)", sa->sa_family);
- return buf;
-}
-
int ptm_bfd_fetch_ifindex(const char *ifname)
{
return if_nametoindex(ifname);
__LINE__);
}
-int ptm_bfd_echo_sock_init(void)
-{
- int s, ttl, yes = 1;
- struct sockaddr_in sin;
-
- s = socket(AF_INET, SOCK_DGRAM, PF_UNSPEC);
- if (s == -1) {
- log_error("echo-socket: creation failed: %s", strerror(errno));
- return -1;
- }
-
- memset(&sin, 0, sizeof(sin));
-#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
- /* OmniOS doesn't have this field, but uses this code. */
- sin.sin_len = sizeof(sin);
-#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
- sin.sin_family = AF_INET;
- sin.sin_port = htons(3785);
- if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) == -1) {
- log_error("echo-socket: bind failure: %s", strerror(errno));
- close(s);
- return -1;
- }
-
- if (setsockopt(s, IPPROTO_IP, IP_RECVTTL, &yes, sizeof(yes)) == -1) {
- log_error("echo-socket: setsockopt(IP_RECVTTL): %s",
- strerror(errno));
- close(s);
- return -1;
- }
-
- ttl = BFD_TTL_VAL;
- if (setsockopt(s, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) == -1) {
- log_error("echo-socket: setsockopt(IP_TTL): %s",
- strerror(errno));
- close(s);
- return -1;
- }
-
- return s;
-}
-
-ssize_t bsd_echo_sock_read(int sd, uint8_t *buf, ssize_t *buflen,
- struct sockaddr_storage *ss, socklen_t *sslen,
- uint8_t *ttl, uint32_t *id)
-{
- struct cmsghdr *cmsg;
- struct bfd_echo_pkt *bep;
- ssize_t readlen;
- struct iovec iov;
- struct msghdr msg;
- uint8_t msgctl[255];
- char errbuf[255];
-
- /* Prepare socket read. */
- memset(ss, 0, sizeof(*ss));
- memset(&msg, 0, sizeof(msg));
- iov.iov_base = buf;
- iov.iov_len = *buflen;
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
- msg.msg_control = msgctl;
- msg.msg_controllen = sizeof(msgctl);
- msg.msg_name = ss;
- msg.msg_namelen = *sslen;
-
- /* Read the socket and treat errors. */
- readlen = recvmsg(sd, &msg, 0);
- if (readlen == 0) {
- log_error("%s: recvmsg: socket closed", __func__);
- return -1;
- }
- if (readlen == -1) {
- if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
- return -1;
-
- log_error("%s: recvmsg: (%d) %s", __func__, errno,
- strerror(errno));
- return -1;
- }
- /* Short packet, better not risk reading it. */
- if (readlen < (ssize_t)sizeof(*bep)) {
- log_warning("%s: short packet (%ld of %d) from %s", __func__,
- readlen, sizeof(*bep),
- sockaddr_to_string(ss, errbuf, sizeof(errbuf)));
- return -1;
- }
- *buflen = readlen;
-
- /* Read TTL information. */
- *ttl = 0;
- for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
- cmsg = CMSG_NXTHDR(&msg, cmsg)) {
- if (cmsg->cmsg_level != IPPROTO_IP)
- continue;
- if (cmsg->cmsg_type != IP_RECVTTL)
- continue;
-
- *ttl = *(uint8_t *)CMSG_DATA(cmsg);
- break;
- }
- if (*ttl == 0) {
- log_debug("%s: failed to read TTL", __func__);
- return -1;
- }
-
- /* Read my discriminator from BFD Echo packet. */
- bep = (struct bfd_echo_pkt *)buf;
- *id = bep->my_discr;
- if (*id == 0) {
- log_debug("%s: invalid packet discriminator from: %s", __func__,
- sockaddr_to_string(ss, errbuf, sizeof(errbuf)));
- return -1;
- }
-
- /* Set the returned sockaddr new length. */
- *sslen = msg.msg_namelen;
-
- return 0;
-}
-
int bp_bind_dev(int sd, const char *dev)
{
/*
return 0;
}
-uint16_t udp4_checksum(struct ip *ip, uint8_t *buf, int len)
-{
- char *ptr;
- struct udp_psuedo_header pudp_hdr;
- uint16_t csum;
-
- pudp_hdr.saddr = ip->ip_src.s_addr;
- pudp_hdr.daddr = ip->ip_dst.s_addr;
- pudp_hdr.reserved = 0;
- pudp_hdr.protocol = ip->ip_p;
- pudp_hdr.len = htons(len);
-
- ptr = XMALLOC(MTYPE_BFDD_TMP, UDP_PSUEDO_HDR_LEN + len);
- memcpy(ptr, &pudp_hdr, UDP_PSUEDO_HDR_LEN);
- memcpy(ptr + UDP_PSUEDO_HDR_LEN, buf, len);
-
- csum = checksum((uint16_t *)ptr, UDP_PSUEDO_HDR_LEN + len);
- XFREE(MTYPE_BFDD_TMP, ptr);
- return csum;
-}
-
#endif /* BFD_BSD */
#ifdef BFD_LINUX
-/* XXX: fix compilation error on Ubuntu 16.04 or older. */
-#ifndef _UAPI_IPV6_H
-#define _UAPI_IPV6_H
-#endif /* _UAPI_IPV6_H */
-
-#include <linux/filter.h>
-#include <linux/if_packet.h>
-
-#include <netinet/if_ether.h>
-
-#include <net/if.h>
-#include <sys/ioctl.h>
-
#include "bfd.h"
-/* Berkeley Packet filter code to filter out BFD Echo packets.
- * tcpdump -dd "(udp dst port 3785)"
- */
-static struct sock_filter bfd_echo_filter[] = {
- {0x28, 0, 0, 0x0000000c}, {0x15, 0, 4, 0x000086dd},
- {0x30, 0, 0, 0x00000014}, {0x15, 0, 11, 0x00000011},
- {0x28, 0, 0, 0x00000038}, {0x15, 8, 9, 0x00000ec9},
- {0x15, 0, 8, 0x00000800}, {0x30, 0, 0, 0x00000017},
- {0x15, 0, 6, 0x00000011}, {0x28, 0, 0, 0x00000014},
- {0x45, 4, 0, 0x00001fff}, {0xb1, 0, 0, 0x0000000e},
- {0x48, 0, 0, 0x00000010}, {0x15, 0, 1, 0x00000ec9},
- {0x6, 0, 0, 0x0000ffff}, {0x6, 0, 0, 0x00000000},
-};
-
/*
* Definitions.
ifr.ifr_name, ifname);
}
-int ptm_bfd_echo_sock_init(void)
-{
- int s;
- struct sock_fprog bpf = {.len = sizeof(bfd_echo_filter)
- / sizeof(bfd_echo_filter[0]),
- .filter = bfd_echo_filter};
-
- s = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP));
- if (s == -1) {
- log_error("echo-socket: creation failure: %s", strerror(errno));
- return -1;
- }
-
- if (setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &bpf, sizeof(bpf))
- == -1) {
- log_error("echo-socket: setsockopt(SO_ATTACH_FILTER): %s",
- strerror(errno));
- close(s);
- return -1;
- }
-
- return s;
-}
-
int bp_bind_dev(int sd __attribute__((__unused__)),
const char *dev __attribute__((__unused__)))
{
return 0;
}
-uint16_t udp4_checksum(struct iphdr *iph, uint8_t *buf, int len)
-{
- char *ptr;
- struct udp_psuedo_header pudp_hdr;
- uint16_t csum;
-
- pudp_hdr.saddr = iph->saddr;
- pudp_hdr.daddr = iph->daddr;
- pudp_hdr.reserved = 0;
- pudp_hdr.protocol = iph->protocol;
- pudp_hdr.len = htons(len);
-
- ptr = XMALLOC(MTYPE_BFDD_TMP, UDP_PSUEDO_HDR_LEN + len);
- memcpy(ptr, &pudp_hdr, UDP_PSUEDO_HDR_LEN);
- memcpy(ptr + UDP_PSUEDO_HDR_LEN, buf, len);
-
- csum = checksum((uint16_t *)ptr, UDP_PSUEDO_HDR_LEN + len);
- XFREE(MTYPE_BFDD_TMP, ptr);
- return csum;
-}
-
#endif /* BFD_LINUX */
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