/*
*===========================================================================
* ipnet_loopback_ip_output
*===========================================================================
* Description: Updates statistics counter and add the link trailer.
* Parameters: netif - The interface the packet was sent to.
* rt - The route followed (ignored).
* pkt - The packet to loopback. pkt->start is the offset to the
* IP header.
* Returns: 0 = success, 0< = error code.
*
*/
IP_STATIC int
ipnet_loopback_ip_output(Ipnet_netif *netif, Ipnet_route_entry *rt, Ipcom_pkt *pkt)
{
Ipnet_loopback_trailer_t *tr;
IPCOM_UNUSED_ARG(rt);
if (IP_UNLIKELY(IP_BIT_ISFALSE(netif->ipcom.flags, IP_IFF_UP)))
{
ipcom_pkt_free(pkt);
return -IP_ERRNO_EHOSTDOWN;
}
#ifdef IPCOM_ZEROCOPY
pkt = ipcom_pkt_make_linear(pkt);
if (IP_UNLIKELY(pkt == IP_NULL))
/* Not enough packets to make this packet linear, not much to
about it */
return 0;
#endif /* IPCOM_ZEROCOPY */
IP_BIT_CLR(pkt->flags, IPCOM_PKT_FLAG_OUTPUT);
#if defined(IPCOM_USE_INET) || defined(IPCOM_USE_INET6)
ip_assert2((pkt->data[pkt->start] & 0xf0) == 0x40 || (pkt->data[pkt->start] & 0xf0) == 0x60);
#elif defined(IPCOM_USE_INET)
ip_assert2((pkt->data[pkt->start] & 0xf0) == 0x40);
#else
ip_assert2((pkt->data[pkt->start] & 0xf0) == 0x60);
#endif
tr = (Ipnet_loopback_trailer_t *) &pkt->data[pkt->end];
IP_SET_32ON8(&tr->scope_id, pkt->ifindex);
pkt->ifindex = netif->ipcom.ifindex;
return ipnet_if_output(netif, pkt);
}
/*
*===========================================================================
* ipnet_if_mib_handler_ifTable
*===========================================================================
* Description: MIB handler for variables in ifTable
* Parameters: See file 'ipsnmp.h'
* Returns: IPSNMP_ERROR_XXX
*
*/
IP_STATIC Ip_s32
ipnet_if_mib_handler_ifTable(Ip_s32 cmd,
char *id,
Ipsnmp_varbind *vb,
Ip_s32 magic,
struct Ipsnmp_node_object *nodeobj)
{
Ip_s32 lid, ret = -1;
Ipnet_netif *best_netif;
Ip_s32 ifAdminStatus = 0;
char *iid;
char *buf = ipcom_malloc(IPSNMP_CONFIG_MAX_OBJECT_ID);
char *best = ipcom_malloc(IPSNMP_CONFIG_MAX_OBJECT_ID);
struct Ip_ifreq ifreq;
Ip_fd fd;
if (buf == IP_NULL || best == IP_NULL)
{
ret = IPSNMP_ERROR_GENERROR;
goto exit;
}
lid = ipsnmp_util_last_subid(nodeobj->id);
ip_assert(lid >= 1 && lid <= 20);
ip_assert(lid != 12 && lid != 18);
best_netif = ipnet_if_mib_table_search_ifTable(id, buf, best, cmd, &ret);
if (best_netif == IP_NULL)
goto exit;
if (cmd == IPSNMP_MIB_COMMAND_GET || cmd == IPSNMP_MIB_COMMAND_NEXT)
{
iid = ipsnmp_create_iid_direct(nodeobj->id, best);
if (iid == IP_NULL)
{
ret = IPSNMP_ERROR_GENERROR;
goto exit;
}
switch(lid)
{
case 1: /* ifIndex */
ret = ipsnmp_util_put_integer(magic, iid, best_netif->ipcom.ifindex);
break;
case 2: /* ifDescr */
ret = ipsnmp_util_put_octetstring(magic, iid, (Ip_u8 *)best_netif->ipcom.name, ipcom_strlen(best_netif->ipcom.name));
break;
case 3: /* ifType */
ret = ipsnmp_util_put_integer(magic, iid, best_netif->ipcom.type);
break;
case 4: /* ifMtu */
ret = ipsnmp_util_put_integer(magic, iid, best_netif->ipcom.mtu);
break;
case 5: /* ifSpeed */
if (best_netif->ipcom.type == IP_IFT_PPP)
ret = ipsnmp_util_put_gauge32(magic, iid, IPCOM_DRV_PPP_BAUDRATE);
else
ret = ipsnmp_util_put_gauge32(magic, iid, 100000000);
break;
case 6: /* ifPhysAddr */
ret = ipsnmp_util_put_octetstring(magic, iid, best_netif->ipcom.link_addr, best_netif->ipcom.link_addr_size);
break;
case 7: /* ifAdminStatus */
if (IP_BIT_ISSET(best_netif->ipcom.flags, IP_IFF_UP))
ret = ipsnmp_util_put_integer(magic, iid, 1);
else
ret = ipsnmp_util_put_integer(magic, iid, 2);
break;
case 8: /* ifOperStatus */
if (IP_BIT_ISSET(best_netif->ipcom.flags, IP_IFF_UP))
ret = ipsnmp_util_put_integer(magic, iid, 1);
else
ret = ipsnmp_util_put_integer(magic, iid, 2);
break;
case 9: /* ifLastChange */
ret = ipsnmp_util_put_timeticks(magic, iid, best_netif->ipcom.mib2.ifLastChange);
break;
case 10: /* ifInOctets */
ret = ipsnmp_util_put_counter32(magic, iid, best_netif->ipcom.mib2.ifInOctets);
break;
case 11: /* ifInUcastPkts */
ret = ipsnmp_util_put_counter32(magic, iid, best_netif->ipcom.mib2.ifInUcastPkts);
break;
case 13: /* ifInDiscards */
ret = ipsnmp_util_put_counter32(magic, iid, best_netif->ipcom.mib2.ifInDiscards);
break;
case 14: /* ifInErrors */
ret = ipsnmp_util_put_counter32(magic, iid, best_netif->ipcom.mib2.ifInErrors);
break;
case 15: /* ifInUnknownProtos */
ret = ipsnmp_util_put_counter32(magic, iid, best_netif->ipcom.mib2.ifInUnknownProtos);
break;
case 16: /* ifOutOctets */
ret = ipsnmp_util_put_counter32(magic, iid, best_netif->ipcom.mib2.ifOutOctets);
break;
case 17: /* ifOutUcastPkts */
ret = ipsnmp_util_put_counter32(magic, iid, best_netif->ipcom.mib2.ifOutUcastPkts);
break;
case 19: /* ifOutDiscards */
ret = ipsnmp_util_put_counter32(magic, iid, best_netif->ipcom.mib2.ifOutDiscards);
break;
case 20: /* ifOutErrors */
ret = ipsnmp_util_put_counter32(magic, iid, best_netif->ipcom.mib2.ifOutErrors);
break;
default:
IP_PANIC();
ret = IPSNMP_ERROR_GENERROR;
break;
}
ipcom_free(iid);
}
if (cmd == IPSNMP_MIB_COMMAND_TEST || cmd == IPSNMP_MIB_COMMAND_SET)
{
switch(lid)
{
case 7: /* ifAdminStatus */
ret = ipsnmp_util_get_integer(vb, &ifAdminStatus);
if (ret == IPSNMP_ERROR_NOERROR)
{
if (ifAdminStatus != 1 && ifAdminStatus != 2)
{
ret = IPSNMP_ERROR_WRONGVALUE;
}
}
if (ret == IPSNMP_ERROR_NOERROR && cmd == IPSNMP_MIB_COMMAND_SET)
{
fd = ipnet_do_socket(IP_AF_INET, IP_SOCK_DGRAM, IP_IPPROTO_UDP, IP_FALSE);
if(fd != IP_INVALID_SOCKET)
{
/* Change interface status */
ipcom_memset(&ifreq, 0, sizeof(struct Ip_ifreq));
ipcom_strcpy(ifreq.ifr_name, best_netif->ipcom.name);
if (ipnet_sys_socketioctl(fd, IP_SIOCGIFFLAGS, &ifreq) < 0)
{
IPCOM_LOG1(ERR, "Failed to get interface flags: %s", ipcom_strerror(ipcom_errno));
ret = IPSNMP_ERROR_GENERROR;
}
if (ifAdminStatus == 1)
IP_BIT_SET(ifreq.ip_ifr_flags, IP_IFF_UP);
else
IP_BIT_CLR(ifreq.ip_ifr_flags, IP_IFF_UP);
if (ipnet_sys_socketioctl(fd, IP_SIOCSIFFLAGS, &ifreq) < 0)
{
IPCOM_LOG1(ERR, "Failed to set interface flags: %s", ipcom_strerror(ipcom_errno));
ret = IPSNMP_ERROR_GENERROR;
}
ipnet_sys_socketclose(fd);
}
else
{
IPCOM_LOG0(ERR, "Failed to create socket for ioctl call");
ret = IPSNMP_ERROR_GENERROR;
}
}
break;
default:
IP_PANIC();
ret = IPSNMP_ERROR_GENERROR;
break;
}
}
exit:
if (buf != IP_NULL)
ipcom_free(buf);
if (best != IP_NULL)
ipcom_free(best);
return ret;
}
/*
*===========================================================================
* ipnet_rtnetlink_route_newroute_family
*===========================================================================
* Description: Add a new rotue via NETLINK.
* Parameters: data - Message payload
* len - Length of message.
* nlh - NETLINK message header
* arg - Reference to route attributes.
*
* Returns: 0 - Success
* <0 - Failure
*
*/
IP_GLOBAL int
ipnet_rtnetlink_route_newroute_family(Ipnet_netlink_mem_t *mem,
struct Ip_nlmsghdr *nlh,
struct Ip_rtattr **rta,
int family)
{
Ipnet_netif *netif = IP_NULL;
Ipnet_ppp_peer *p = IP_NULL;
int ret = -1;
Ip_u16 vr;
Ip_u32 table;
Ip_bool is_multipath_route = IP_FALSE;
Ip_ssize_t mpa_size = 0;
struct Ip_rtnexthop *nh = IP_NULL;
struct Ipnet_rt_metrics metrics;
struct Ip_sockaddr *gw = IP_NULL;
void *mask = IP_NULL;
struct Ip_sockaddr_dl gw_dl;
struct Ipnet_route_add_param param;
struct Ip_rtmsg *rtm = IP_NLMSG_DATA(nlh);
union Ip_sockaddr_union ugw;
Ipnet_rtnetlink_key_t ukey;
#ifdef IPMPLS
struct Ip_sockaddr_mpls gw_mpls;
#endif /* IPMPLS */
#ifdef IPNET_USE_ROUTE_COOKIES
Ipnet_rt_cookie cookie;
#endif /* IPNET_USE_ROUTE_COOKIES */
table = IPCOM_ROUTE_TABLE_GET(rtm->rtm_table);
/* Prepare route parameters */
ipcom_memset(¶m, 0, sizeof(param));
ipcom_memset(&metrics,0,sizeof(metrics));
param.flags = IPNET_RTF_STATIC | IPNET_RTF_UP | IPNET_RTF_DONE;
#ifdef IPNET_USE_ROUTE_TABLE_NAMES
if (rta[IP_RTA_TABLE_NAME -1])
{
if (ipnet_route_vr_and_table_from_name(IP_RTA_DATA(rta[IP_RTA_TABLE_NAME - 1]),
&vr,
&table) < 0)
return -IP_ERRNO_ESRCH;
}
else
#endif
{
if (mem->vr == IPCOM_VR_ANY)
return -IP_ERRNO_EINVAL;
vr = ipnet_rtnetlink_vr(rta[IP_RTA_VR - 1], mem->vr);
if (rta[IP_RTA_TABLE - 1])
table = IP_GET_32ON8(IP_RTA_DATA(rta[IP_RTA_TABLE - 1]));
}
if (rta[IP_RTA_OIF -1])
{
int ifindex = 0;
if (rta[IP_RTA_OIF-1]->rta_len != IP_RTA_LENGTH(sizeof(int)))
return -IP_ERRNO_EINVAL;
ifindex = IP_GET_32ON8(IP_RTA_DATA(rta[IP_RTA_OIF-1]));
netif = ipnet_if_indextonetif(vr, ifindex);
if (netif)
p = netif->private_data;
}
if (rta[IP_RTA_MULTIPATH -1])
{
is_multipath_route = IP_TRUE;
nh = IP_RTA_DATA(rta[IP_RTA_MULTIPATH-1]);
mpa_size = IP_RTA_PAYLOAD(rta[IP_RTA_MULTIPATH-1]);
if ((nh == IP_NULL) || (mpa_size == 0))
return -IP_ERRNO_EINVAL;
}
if ((ret = ipnet_rtnetlink_route_key_setup(family, &ukey, netif? netif->ipcom.ifindex : 0, &mask, rtm->rtm_dst_len, rta[IP_RTA_DST-1])) < 0)
return ret;
if ((ret = ipnet_rtnetlink_route_gw_setup(family, netif? netif->ipcom.ifindex : 0, &ugw, &gw, rta[IP_RTA_GATEWAY-1])) < 0)
return ret;
#ifdef IPCOM_USE_INET
if (family == IP_AF_INET)
{
if (gw != IP_NULL)
{
/* Check if it is a pure gateway or not */
if (p == IP_NULL || p->peer4.s_addr != ugw.sin.sin_addr.s_addr)
param.flags |= IPNET_RTF_GATEWAY;
}
}
else
#endif
#ifdef IPCOM_USE_INET6
if (family == IP_AF_INET6)
{
if (gw != IP_NULL)
{
/* Check if it is a pure gateway or not */
if (p == IP_NULL || !IP_IN6_ARE_ADDR_EQUAL(&ugw.sin6.sin6_addr, &p->peer6))
param.flags |= IPNET_RTF_GATEWAY;
}
}
else
#endif
{
return -IP_ERRNO_EAFNOSUPPORT;
}
if (!mask)
param.flags |= IPNET_RTF_HOST;
if (rtm->rtm_type == IP_RTN_PROXY)
{
/* This is a proxy arp network route */
IP_BIT_CLR(param.flags, IPNET_RTF_CLONING);
IP_BIT_SET(param.flags, IPNET_RTF_PROTO2);
if (rta[IP_RTA_PROXY_ARP_LLADDR - 1])
{
/* This is a network proxy arp with specific lladdr */
if (netif == IP_NULL)
return -IP_ERRNO_EINVAL;
ipcom_memset(&gw_dl, 0, sizeof(struct Ip_sockaddr_dl));
IPCOM_SA_LEN_SET(&gw_dl, sizeof(struct Ip_sockaddr_dl));
gw_dl.sdl_family = IP_AF_LINK;
gw_dl.sdl_index = (Ip_u16)netif->ipcom.ifindex;
gw_dl.sdl_alen = (Ip_u8) netif->ipcom.link_addr_size;
gw_dl.sdl_type = (Ip_u8) netif->ipcom.type;
ipcom_memcpy(IP_SOCKADDR_DL_LLADDR(&gw_dl),
IP_RTA_DATA(rta[IP_RTA_PROXY_ARP_LLADDR - 1]),
IPNET_ETH_ADDR_SIZE);
gw = (struct Ip_sockaddr *) &gw_dl;
IP_BIT_SET(param.flags, IPNET_RTF_LLINFO);
}
}
else if (rtm->rtm_type == IP_RTN_PROHIBIT)
IP_BIT_SET(param.flags, IPNET_RTF_REJECT);
else if (rtm->rtm_type == IP_RTN_THROW)
IP_BIT_SET(param.flags, IPNET_RTF_SKIP);
else if (rtm->rtm_type == IP_RTN_UNREACHABLE)
{
if (netif == IP_NULL)
netif = ipnet_loopback_get_netif(vr);
IP_BIT_CLR(param.flags, IPNET_RTF_UP);
}
else if (rtm->rtm_type == IP_RTN_CLONE)
IP_BIT_SET(param.flags, IPNET_RTF_CLONING);
else if (rtm->rtm_type == IP_RTN_BLACKHOLE)
IP_BIT_SET(param.flags, IPNET_RTF_BLACKHOLE);
#ifdef IPMPLS
/* Check for IPNET MPLS pseudo-wire route */
if (rta[IP_RTA_NH_PROTO-1])
{
Ip_u32 nh_type;
if (rta[IP_RTA_NH_PROTO-1]->rta_len != IP_RTA_LENGTH(sizeof(Ip_u32)))
return -IP_ERRNO_EINVAL;
if (rta[IP_RTA_NH_PROTO_DATA-1]->rta_len != IP_RTA_LENGTH(sizeof(Ip_u32)))
return -IP_ERRNO_EINVAL;
ipcom_memcpy(&nh_type, IP_RTA_DATA(rta[IP_RTA_NH_PROTO-1]), sizeof(Ip_u32));
if (nh_type != IPNET_ETH_P_MPLS_UNICAST)
return -IP_ERRNO_EINVAL;
ipcom_memset(&gw_mpls, 0, sizeof(gw_mpls));
gw_mpls.smpls_family = IP_AF_MPLS;
IPCOM_SA_LEN_SET(&gw_mpls, sizeof (struct Ip_sockaddr_mpls));
ipcom_memcpy(&gw_mpls.smpls_key,
IP_RTA_DATA(rta[IP_RTA_NH_PROTO_DATA-1]),
sizeof(Ip_u32));
IP_BIT_CLR(param.flags,IPNET_RTF_GATEWAY);
gw = (struct Ip_sockaddr *)&gw_mpls;
}
else
{
/* Check if cloning flag shall be set */
if (IP_BIT_ISFALSE(param.flags, IPNET_RTF_HOST | IPNET_RTF_GATEWAY | IPNET_RTF_REJECT | IPNET_RTF_BLACKHOLE))
IP_BIT_SET(param.flags, IPNET_RTF_CLONING);
}
#endif
if (rta[IP_RTA_METRICS-1])
{
int rlen = (int)IP_RTA_PAYLOAD(rta[IP_RTA_METRICS-1]);
Ip_u32 dummy = 0;
struct Ip_rtattr *rtax = (struct Ip_rtattr*)IP_RTA_DATA(rta[IP_RTA_METRICS-1]);
metrics.rmx_expire = IPCOM_ADDR_INFINITE;
param.metrics = &metrics;
for(;rlen > 0; rlen -= (int)rtax->rta_len,rtax = IP_RTA_NEXT(rtax,dummy))
{
switch (rtax->rta_type)
{
case IP_RTAX_MTU:
ipcom_memcpy(&metrics.rmx_mtu, IP_RTA_DATA(rtax), sizeof(Ip_u32));
break;
case IP_RTAX_RTT:
ipcom_memcpy(&metrics.rmx_rtt, IP_RTA_DATA(rtax), sizeof(Ip_u32));
break;
case IP_RTAX_RTTVAR:
ipcom_memcpy(&metrics.rmx_rttvar, IP_RTA_DATA(rtax), sizeof(Ip_u32));
break;
}
}
}
#ifdef IPNET_USE_ROUTE_COOKIES
if (rta[IP_RTA_COOKIE-1])
{
if (IP_RTA_PAYLOAD(rta[IP_RTA_COOKIE-1]) > sizeof(cookie))
return -IP_ERRNO_EINVAL;
ipcom_memset(&cookie, 0, sizeof(cookie));
ipcom_memcpy(&cookie,
IP_RTA_DATA(rta[IP_RTA_COOKIE-1]),
IP_RTA_PAYLOAD(rta[IP_RTA_COOKIE-1]));
param.cookie = &cookie;
}
#endif /* IPNET_USE_ROUTE_COOKIES */
while (1)
{
if (is_multipath_route && (gw == IP_NULL))
{
netif = ipnet_if_indextonetif(vr, nh->rtnh_ifindex);
metrics.rmx_hopcount = nh->rtnh_hops;
metrics.rmx_expire = IPCOM_ADDR_INFINITE;
param.metrics = &metrics;
if (nh->rtnh_len > sizeof(struct Ip_rtnexthop))
{
/* Multihop route has gateway */
IP_BIT_CLR(param.flags, IPNET_RTF_CLONING);
IP_BIT_SET(param.flags, IPNET_RTF_GATEWAY);
if ((ret = ipnet_rtnetlink_route_gw_setup(family, netif? netif->ipcom.ifindex : 0, &ugw, &gw, IP_RTNH_DATA(nh))) < 0)
return ret;
}
mpa_size -= IP_RTNH_ALIGN(nh->rtnh_len);
if (mpa_size > 0)
nh = IP_RTNH_NEXT(nh);
}
param.domain = family;
param.vr = vr;
param.table = table;
param.netif = netif;
param.key = &ukey;
param.netmask = mask;
param.gateway = gw;
param.pid = mem->pid;
param.seq = nlh->nlmsg_seq;
param.no_ref_count = IP_TRUE;
/* Try to add the route */
if (netif)
IPNET_IF_LOCK(netif);
ret = ipnet_route_add(¶m);
if (netif != IP_NULL)
IPNET_IF_UNLOCK(netif);
if (is_multipath_route)
{
gw = IP_NULL;
if (ret < 0 && ret != -IP_ERRNO_EEXIST)
goto rollback;
if (mpa_size == 0)
{
ret = 0;
break;
}
else if (mpa_size < 0)
{
/* Malformed packet */
ret = -IP_ERRNO_EINVAL;
goto rollback;
}
}
else
break;
}
return ret;
rollback:
(void)ipnet_rtnetlink_route_delroute_family(mem, nlh, rta, family);
return ret;
}
/*
*===========================================================================
* ipnet_gre_input
*===========================================================================
* Description: Handler for received GRE packets.
* Parameters: pkt - Received GRE packet.
* Returns: 0 = success, <0 = error code.
*
*/
IP_GLOBAL int
ipnet_gre_input(Ipnet_netif *netif, Ipcom_pkt *pkt)
{
Ipnet_pkt_gre *gre_hdr;
int gre_hdr_start = pkt->start;
IP_BIT_CLR(pkt->flags, IPCOM_PKT_FLAG_IPV4 | IPCOM_PKT_FLAG_IPV6);
gre_hdr = (Ipnet_pkt_gre *)&pkt->data[pkt->start];
pkt->start += IPNET_GRE_HDR_SIZE;
/* First 16-bits non-null, verify bits and version. */
if (gre_hdr->flags_reserved0_ver)
{
/* RFC 2784: 2.3. Reserved0 (bits 1-12)
A receiver MUST discard a packet where any of bits 1-5 are non-zero,
unless that receiver implements RFC 1701. Bits 6-12 are reserved for
future use. These bits MUST be sent as zero and MUST be ignored on
receipt.
RFC 2890: 2. Extensions to GRE Header
Key present (bit 2)
Sequence Number Present (bit 3)
*/
if (IP_BIT_ISSET(gre_hdr->flags_reserved0_ver, IPNET_GRE_FLAG_MUSTBE0))
goto cleanup;
/* RFC 2784: 2.3.1. Version Number (bits 13-15)
The Version Number field MUST contain the value zero.
*/
if (IP_BIT_ISSET(gre_hdr->flags_reserved0_ver, IPNET_GRE_FLAG_VERSION))
goto cleanup;
/* RFC 2784: 2.5. Checksum (2 octets)
The Checksum field contains the IP (one's complement) checksum sum of
the all the 16 bit words in the GRE header and the payload packet.
For purposes of computing the checksum, the value of the checksum
field is zero. This field is present only if the Checksum Present bit
is set to one.
*/
if (IPNET_GRE_CHECKSUM_PRESENT(gre_hdr))
{
pkt->start += IPNET_GRE_OPT_CSUM_SIZE;
/* IP checksum must be ok. */
if (ipcom_in_checksum(&gre_hdr->flags_reserved0_ver, pkt->end - gre_hdr_start) != 0)
goto cleanup;
}
#ifdef IPNET_USE_RFC2890
/* RFC 2890: 2.1. Key Field (4 octets)
The Key field contains a four octet number which was inserted by the
encapsulator. The actual method by which this Key is obtained is
beyond the scope of the document. The Key field is intended to be
used for identifying an individual traffic flow within a tunnel. For
example, packets may need to be routed based on context information
not present in the encapsulated data. The Key field provides this
context and defines a logical traffic flow between encapsulator and
decapsulator. Packets belonging to a traffic flow are encapsulated
using the same Key value and the decapsulating tunnel endpoint
identifies packets belonging to a traffic flow based on the Key Field
value.
*/
if (IPNET_GRE_KEY_PRESENT(gre_hdr))
{
Ip_u32 key;
key = IP_GET_NTOHL(&pkt->data[pkt->start]);
IPNET_GRE_PKT_SET_KEY(pkt, key);
pkt->start += IPNET_GRE_OPT_KEY_SIZE;
}
/* RFC 2890: 2.2. Sequence Number (4 octets)
The Sequence Number field is a four byte field and is inserted by the
encapsulator when Sequence Number Present Bit is set. The Sequence
Number MUST be used by the receiver to establish the order in which
packets have been transmitted from the encapsulator to the receiver.
The intended use of the Sequence Field is to provide unreliable but
in-order delivery. If the Key present bit (bit 2) is set, the
sequence number is specific to the traffic flow identified by the Key
field. Note that packets without the sequence bit set can be
interleaved with packets with the sequence bit set.
*/
if (IPNET_GRE_SEQNUM_PRESENT(gre_hdr))
{
Ipnet_gre_t *gre = netif->ipcom.pdrv;
Ip_u32 seqnum;
seqnum = IP_GET_NTOHL(&pkt->data[pkt->start]);
if (seqnum == gre->recv_seqnum)
/* In order segment */
++gre->recv_seqnum;
else if (IPCOM_IS_LT(seqnum, gre->recv_seqnum))
/* Out of order */
goto cleanup;
else
{
Ip_u32 outoforder_timer;
int max_perflow_buffer;
max_perflow_buffer = ipcom_sysvar_get_as_int0("ipnet.gre.MAX_PERFLOW_BUFFER", 3);
outoforder_timer = ipcom_sysvar_get_as_int0("ipnet.gre.OUTOFORDER_TIMER", 1000);
if (max_perflow_buffer <= 0)
/* No buffering allowed */
goto cleanup;
while (ipcom_pqueue_size(gre->reassembly_queue) >= max_perflow_buffer)
{
ipnet_timeout_cancel(gre->reassembly_tmo);
/* Call the timeout handler to force the oldest packet(s)
to be inputted to the stack and the receive sequence
number to advanced */
ipnet_gre_seq_tmo(netif);
}
if (gre_hdr->protocol_type == ip_htons(0x0800))
IP_BIT_SET(pkt->flags, IPCOM_PKT_FLAG_IPV4);
else if (gre_hdr->protocol_type == ip_htons(0x86DD))
IP_BIT_SET(pkt->flags, IPCOM_PKT_FLAG_IPV6);
IPNET_PKT_SET_TIMEOUT_ABS(pkt, ipnet->msec_now + outoforder_timer);
if (gre->reassembly_tmo == IP_NULL)
if (ipnet_timeout_schedule(outoforder_timer,
(Ipnet_timeout_handler) ipnet_gre_seq_tmo,
netif,
&gre->reassembly_tmo) < 0)
goto cleanup;
if (ipcom_pqueue_insert(gre->reassembly_queue, pkt) != IPCOM_SUCCESS)
{
ipnet_timeout_cancel(gre->reassembly_tmo);
goto cleanup;
}
return 0;
}
pkt->start += IPNET_GRE_OPT_SEQNUM_SIZE;
}
#endif /* IPNET_USE_RFC2890 */
}
/**/
if (netif->ipcom.link_tap)
/* start is PAYLOAD == the inner IP header; ipstart points to the PREVIOUS
* IP header */
netif->ipcom.link_tap(&netif->ipcom, pkt, IP_PACKET_HOST, gre_hdr->protocol_type, pkt->start, pkt->start);
#ifdef IPCOM_USE_INET
/* IPv4 in GRE. */
if (gre_hdr->protocol_type == ip_htons(0x0800))
return ipnet_ip4_input(netif, pkt);
#endif
#ifdef IPCOM_USE_INET6
/* IPv6 in GRE. */
if (gre_hdr->protocol_type == ip_htons(0x86DD))
return ipnet_ip6_input(netif, pkt);
#endif
/* Unsupported Protocol Type, drop. */
cleanup:
ipcom_pkt_free(pkt);
return -IP_ERRNO_EINVAL;
}
/*
*===========================================================================
* ipcom_drv_ppp_ioctl
*===========================================================================
* Description: IO control.
* Parameters: netif - A network interface.
* command - The control task to perform.
* data - Data associated with the specified command.
* Returns: 0 = success, <0 = error code
*
*/
IP_STATIC int
ipcom_drv_ppp_ioctl(Ipcom_netif *netif, Ip_u32 command, void *data)
{
Ipcom_pdrv_ppp *pdrv;
Ipcom_drv_ppp_link *plink;
struct Ip_pppreq *pppreq;
int ret;
pdrv = (Ipcom_pdrv_ppp *)netif->pdrv;
plink = &pdrv->plink[netif->link_index];
pppreq = data;
switch (command)
{
case IP_SIOCXOPEN:
case IP_SIOCXPPPSDRVUP:
/* Create the driver. */
ret = ipcom_drv_ppp_init(plink);
if (ret != 0)
return ret;
/* Signal link up immediately. */
netif->link_ioevent(netif, IP_EIOXUP, IP_NULL, 0);
break;
case IP_SIOCXCLOSE:
case IP_SIOCXPPPSDRVDOWN:
/* Kill the driver. */
if (ipcom_drv_ppp_exit(plink) != 0)
return -IP_ERRNO_EINVAL;
/* Signal link down immediately. */
netif->link_ioevent(netif, IP_EIOXDOWN, IP_NULL, 0);
break;
case IP_SIOCIFDESTROY:
if (IP_BIT_ISSET(netif->flags, IP_IFF_RUNNING))
return -IP_ERRNO_EBUSY;
ret = ipcom_if_detach(netif);
if (ret != 0)
return 0;
if (plink->devname)
ipcom_free(plink->devname);
if (pdrv != IP_NULL)
ipcom_free(pdrv);
return ipcom_if_free(netif);
case IP_SIOCXPPPGDRVCONF:
pppreq->pppru.drvconf.drv_flags = 0; /* See ipcom_netif.h for IP_DRVPPP_FLAG_xxx options. */
pppreq->pppru.drvconf.baudrate = plink->baudrate;
pppreq->pppru.drvconf.rcv_accm = 0xffffffff;
pppreq->pppru.drvconf.snd_accm = 0xffffffff;
pppreq->pppru.drvconf.mru = 1500;
pppreq->pppru.drvconf.mtu = 1500;
break;
case IP_SIOCXPPPSDRVBAUDRATE:
/* Running, change the baudrate. */
if (plink->fd != -1)
if (ioctl(plink->fd, FIOBAUDRATE, pppreq->pppru.drv_baudrate) != OK)
return -IP_ERRNO_EINVAL;
/* Baudrate changed. */
plink->baudrate = pppreq->pppru.drv_baudrate;
break;
case IP_SIOCXPPPSDRVWINCOMPAT:
plink->wincompat = pppreq->pppru.drv_wincompat;
break;
case IP_SIOCXPROMISC:
if (*(Ip_bool *) data)
IP_BIT_SET(netif->flags, IP_IFF_PROMISC);
else
IP_BIT_CLR(netif->flags, IP_IFF_PROMISC);
break;
default:
return -IP_ERRNO_EINVAL;
}
return 0;
}
/*
*===========================================================================
* ipnet_fragment_packet
*===========================================================================
* Description: Splits a packet that is to big to fit into the MTU of the
* network interface.
* Parameters: pkt - The packet to split. pkt->start is the offset to the
* extension header (or transport layer protocol) with the
* id of 'next_hdr'. This packet is released by this function.
* ip_hdr_size - The size of the IP header.
* other_hdr_size - The size of other headers that will be
* added due to fragmentation.
* mtu - The MTU of the network interface.
* has_more_fragments - function that returns IP_TRUE if the
* packet passed as an argument has more fragments. This
* parameter might be IP_NULL.
* Returns: A list of fragments or IP_NULL if not enough memory could
* be allocated to create all fragments.
*/
IP_GLOBAL Ipcom_pkt *
ipnet_fragment_packet(Ipcom_pkt *pkt,
int ip_hdr_size,
int other_hdr_size,
int mtu,
Ipnet_more_fragments_func more_fragments)
{
Ipcom_pkt *frag_pkt_head;
Ipcom_pkt *frag_pkt_tail;
Ipcom_pkt *frag_pkt;
int frag_size;
int total_size;
int size_of_this_fragment;
int frag_offset;
Ipnet_pkt_info_sock_snd_buf *ssb;
total_size = pkt->end - pkt->start;
frag_size = (mtu - ip_hdr_size - other_hdr_size) & 0xfff8;
frag_pkt_head = IP_NULL;
frag_pkt_tail = IP_NULL;
frag_offset = 0;
while (frag_offset < total_size)
{
if (total_size - frag_offset > frag_size)
size_of_this_fragment = frag_size;
else
size_of_this_fragment = total_size - frag_offset;
frag_pkt = ipcom_pkt_malloc(mtu, IP_FLAG_FC_STACKCONTEXT);
if (frag_pkt == IP_NULL)
{
IPCOM_WV_MARKER_1 ( IPCOM_WV_NETD_IP4_DATAPATH_EVENT, IPCOM_WV_NETD_CRITICAL, 1, 1, IPCOM_WV_NETD_NOBUFS,
ipnet_fragment_packet, IPCOM_WV_IPNET_FRAG_MODULE, IPCOM_WV_NETD_IP_REASSEMBLE);
IPNET_STATS(pkt_frag_nomem++);
ipcom_pkt_free(pkt);
if (frag_pkt_head != IP_NULL)
ipcom_pkt_free(frag_pkt_head);
return IP_NULL;
}
#ifdef IPCOM_USE_MIB2
if(other_hdr_size == 0)
{
#ifdef IPCOM_USE_INET
Ipnet_netif *netif = ipnet_if_indextonetif(pkt->vr_index, pkt->ifindex);
IPCOM_MIB2(ipFragCreates++);
if (netif != IP_NULL)
{
IPCOM_MIB2_SYSWI_U32_ADD(v4, ipSystemStatsOutFragCreates, 1);
IPCOM_MIB2_PERIF_U32_ADD(v4, ipIfStatsOutFragCreates, 1, netif);
}
#endif
}
else
{
#ifdef IPCOM_USE_INET6
Ipnet_netif *netif = ipnet_if_indextonetif(pkt->vr_index, pkt->ifindex);
IPCOM_MIB2_NETIF(ipv6IfStatsOutFragCreates++);
if (netif != IP_NULL)
{
IPCOM_MIB2_SYSWI_U32_ADD(v6, ipSystemStatsOutFragCreates, 1);
IPCOM_MIB2_PERIF_U32_ADD(v6, ipIfStatsOutFragCreates, 1, netif);
}
#endif
}
#endif /* IPCOM_USE_MIB2 */
if (frag_pkt_head == IP_NULL)
frag_pkt_head = frag_pkt;
else
frag_pkt_tail->next_fragment = frag_pkt;
frag_pkt_tail = frag_pkt;
IPCOM_PKT_TRACE(frag_pkt, IPCOM_PKT_ID_FRAG);
frag_pkt->fd = pkt->fd;
frag_pkt->ifindex = pkt->ifindex;
frag_pkt->flags = pkt->flags;
frag_pkt->vr_index = pkt->vr_index;
/* Copy IP packet payload */
frag_pkt->start = (frag_pkt->maxlen - size_of_this_fragment) & ~0x3;
frag_pkt->end = frag_pkt->start + size_of_this_fragment;
ip_assert(frag_pkt->start < frag_pkt->maxlen);
ipcom_memcpy(&frag_pkt->data[frag_pkt->start],
&pkt->data[pkt->start + frag_offset],
(Ip_size_t)size_of_this_fragment);
frag_pkt->offset = (Ip_u16) (frag_offset + pkt->offset);
frag_offset += size_of_this_fragment;
IP_BIT_SET(frag_pkt->flags, IPCOM_PKT_FLAG_MORE_FRAG);
}
if (IP_BIT_ISFALSE(pkt->flags, IPCOM_PKT_FLAG_FRAGMENT)
|| (more_fragments && IP_FALSE == more_fragments(pkt)))
/* This is either an IP datagram sourced from this node or the
last fragment of an IP datagram that has been forwarded by
this node. */
IP_BIT_CLR(frag_pkt_tail->flags, IPCOM_PKT_FLAG_MORE_FRAG);
ip_assert(pkt->start + frag_offset == pkt->end);
ip_assert(frag_pkt_head != IP_NULL);
if (IP_NULL != (ssb = ipcom_pkt_get_info(pkt, IPNET_PKT_INFO_SOCK_SND_BUF)))
{
/* Transfer the socket send buffer allocation from the
original packet to the last fragment to make sure that the
send flow control is still driven by TX done events. */
ipcom_pkt_set_info(frag_pkt_tail,
IPNET_PKT_INFO_SOCK_SND_BUF,
sizeof(Ipnet_pkt_info_sock_snd_buf),
ssb);
frag_pkt_tail->dtor = pkt->dtor;
pkt->dtor = IP_NULL;
}
/* Do not free original yet, since it might hold the
callers signal buffer. Put it in the fragment tails
next original instead and it will be freed when the
last segment has been transmitted */
if (frag_pkt_tail != IP_NULL)
frag_pkt_tail->next_original = pkt;
else
ipcom_pkt_free(pkt);
return frag_pkt_head;
}
