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/*
* Copyright (C) 2009 IBM Corp.
* Copyright (C) 2010-2018 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*
* Version 1.0 [email protected] 2009-07-06
*/
// See the BZ1546179 block comment in tapset/linux/networking.stp for
// an explanation of the try/catch statements around sk_buff structure
// accesses.
%{ /* pure */
#include <net/route.h>
#include <linux/skbuff.h>
#include <linux/icmp.h>
#include <linux/rtnetlink.h>
#include <linux/tcp.h>
%}
/* Commented globals represent statistics that are not supported in this
* version.
*/
global InReceives
// global InHdrErrors
// global InTooBigErrors
global InNoRoutes
global InAddrErrors
global InUnknownProtos
// global InTruncatedPkts
global InDiscards // included counts of InHdrErrors InTruncatedPkts
// global InDelivers
%( kernel_v >= "2.6.24" %?
global ForwDatagrams
%)
global OutRequests
// global OutDiscards
// global OutNoRoutes
global ReasmTimeout
global ReasmReqds
//global ReasmOKs
// global ReasmFails
global FragOKs
global FragFails
// global FragCreates
// global InMcastPkts
// global OutMcastPkts
// global InBcastPkts
// global OutBcastPkts
/**
* sfunction ipmib_remote_addr - Get the remote ip address
* @skb: pointer to a struct sk_buff
* @SourceIsLocal: flag to indicate whether local operation
*
* Returns the remote ip address from @skb.
*/
function ipmib_remote_addr:long (skb:long, SourceIsLocal:long)
{
iphdr = __get_skb_iphdr(skb);
if ( SourceIsLocal )
return ntohl(__ip_skb_daddr(iphdr));
return ntohl(__ip_skb_saddr(iphdr));
}
/**
* sfunction ipmib_local_addr - Get the local ip address
* @skb: pointer to a struct sk_buff
* @SourceIsLocal: flag to indicate whether local operation
*
* Returns the local ip address @skb.
*/
function ipmib_local_addr:long (skb:long, SourceIsLocal:long)
{
iphdr = __get_skb_iphdr(skb);
if ( SourceIsLocal )
return ntohl(__ip_skb_saddr(iphdr));
return ntohl(__ip_skb_daddr(iphdr));
}
/**
* sfunction ipmib_tcp_remote_port - Get the remote tcp port
* @skb: pointer to a struct sk_buff
* @SourceIsLocal: flag to indicate whether local operation
*
* Returns the remote tcp port from @skb.
*/
function ipmib_tcp_remote_port:long (skb:long, SourceIsLocal:long)
{
th = _plunge_into_tcphdr(skb);
if ( SourceIsLocal )
return __tcp_skb_dport(th);
return __tcp_skb_sport(th);
}
/**
* sfunction ipmib_tcp_local_port - Get the local tcp port
* @skb: pointer to a struct sk_buff
* @SourceIsLocal: flag to indicate whether local operation
*
* Returns the local tcp port from @skb.
*/
function ipmib_tcp_local_port:long (skb:long, SourceIsLocal:long)
{
th = _plunge_into_tcphdr(skb);
if ( SourceIsLocal )
return __tcp_skb_sport(th);
return __tcp_skb_dport(th);
}
/**
* sfunction ipmib_get_proto - Get the protocol value
* @skb: pointer to a struct sk_buff
*
* Returns the protocol value from @skb.
*/
function ipmib_get_proto:long (skb:long)
{
iphdr = __get_skb_iphdr(skb);
return __ip_skb_proto(iphdr);
}
/* Internal functions */
/*
* We can't assume the pointer to the sk_buff->transport_header
* has been updated, so we must calculate the value from the network_header.
* The caller must verify the skb is for a tcpip packet.
*/
@__private30 function _plunge_into_tcphdr:long (skb:long)
%{
struct sk_buff *skb = (struct sk_buff *)(uintptr_t)STAP_ARG_skb;
/* as done by skb_network_header() */
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,21)
STAP_RETVALUE=(long)kread(&(skb->nh.raw)) +
(long)sizeof(struct tcphdr);
#else
#ifdef NET_SKBUFF_DATA_USES_OFFSET
STAP_RETVALUE=(long)kread(&(skb->network_header)) +
(long)(kread(&(skb->head))) +
(long)sizeof(struct tcphdr);
#else
STAP_RETVALUE=(long)kread(&(skb->network_header)) +
(long)sizeof(struct tcphdr);
#endif
#endif
CATCH_DEREF_FAULT();
%}
@__private30 function _ehostunreach:long ()
{
return @const("EHOSTUNREACH")
}
@__private30 function _enetunreach:long ()
{
return @const("ENETUNREACH")
}
@__private30 function _icmp_dest_unreach:long ()
{
return @const("ICMP_DEST_UNREACH")
}
@__private30 function _icmp_prot_unreach:long ()
{
return @const("ICMP_PROT_UNREACH")
}
@__private30 function _net_rx_drop:long ()
{
return @const("NET_RX_DROP")
}
@__private30 function _icmp_time_exceeded:long ()
{
return @const("ICMP_TIME_EXCEEDED")
}
@__private30 function _icmp_exc_fragtime:long ()
{
return @const("ICMP_EXC_FRAGTIME")
}
@__private30 function _rtn_multicast:long ()
{
return @const("RTN_MULTICAST")
}
@__private30 function _rtn_broadcast:long ()
{
return @const("RTN_BROADCAST")
}
/**
* probe ipmib.InReceives - Count an arriving packet
* @skb: pointer to the struct sk_buff being acted on
* @op: value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* ipmib_filter_key(). If the packet passes the filter is is
* counted in the global @InReceives (equivalent to SNMP's MIB
* IPSTATS_MIB_INRECEIVES)
*/
probe ipmib.InReceives=kernel.function("ip_rcv")
{
skb = $skb;
op = 1;
SourceIsLocal = 0;
try { key = ipmib_filter_key(skb, op, SourceIsLocal) } catch { }
if ( key ) InReceives[key] += op;
}
/**
* probe ipmib.InNoRoutes - Count an arriving packet with no matching socket
* @skb: pointer to the struct sk_buff being acted on
* @op: value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* ipmib_filter_key(). If the packet passes the filter is is
* counted in the global @InNoRoutes (equivalent to SNMP's MIB
* IPSTATS_MIB_INNOROUTES)
*/
probe ipmib.InNoRoutes=kernel.function("ip_route_input_noref").return!,
kernel.function("ip_route_input_common").return!,
kernel.function("ip_route_input").return
{
skb = @entry($skb);
op = 1;
SourceIsLocal = 0;
if ( $return != -_enetunreach()) next;
try { key = ipmib_filter_key(skb, op, SourceIsLocal) } catch { }
if ( key ) InNoRoutes[key] += op;
}
/**
* probe ipmib.InAddrErrors - Count arriving packets with an incorrect address
* @skb: pointer to the struct sk_buff being acted on
* @op: value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* ipmib_filter_key(). If the packet passes the filter is is
* counted in the global @InAddrErrors (equivalent to SNMP's MIB
* IPSTATS_MIB_INADDRERRORS)
*/
probe ipmib.InAddrErrors=kernel.function("ip_route_input_noref").return!,
kernel.function("ip_route_input_common").return!,
kernel.function("ip_route_input").return
{
skb = @entry($skb);
op = 1;
SourceIsLocal = 0;
if ( $return != -_ehostunreach()) next;
try { key = ipmib_filter_key(skb, op, SourceIsLocal) } catch { }
if ( key ) InAddrErrors[key] += op;
}
/**
* probe ipmib.InUnknownProtos - Count arriving packets with an unbound proto
* @skb: pointer to the struct sk_buff being acted on
* @op: value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* ipmib_filter_key(). If the packet passes the filter is is
* counted in the global @InUnknownProtos (equivalent to SNMP's MIB
* IPSTATS_MIB_INUNKNOWNPROTOS)
*/
/* icmp_send() is called by ip_local_deliver_finish() */
probe ipmib.InUnknownProtos=kernel.function("icmp_send")
{
skb = $skb_in;
op = 1;
SourceIsLocal = 0;
if (($type==_icmp_dest_unreach())&&($code==_icmp_prot_unreach())){
try {
key = ipmib_filter_key(skb, op, SourceIsLocal)
} catch { }
if ( key ) InUnknownProtos[key] += op;
}
}
/**
* probe ipmib.InDiscards - Count discarded inbound packets
* @skb: pointer to the struct sk_buff being acted on
* @op: value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* ipmib_filter_key(). If the packet passes the filter is is
* counted in the global @InDiscards (equivalent to SNMP's MIB
* STATS_MIB_INDISCARDS)
*/
/*
This stat combines all instances of IPSTATS_MIB_INHDRERRORS,
IPSTATS_MIB_INTRUNCATEDPKTS, and STATS_MIB_INDISCARDS.
*/
probe ipmib.InDiscards=kernel.function("ip_rcv").return
{
skb = @entry($skb);
op = 1;
SourceIsLocal = 0;
if ( $return != _net_rx_drop() ) next;
try { key = ipmib_filter_key(skb, op, SourceIsLocal) } catch { }
if ( key ) InDiscards[key] += op;
}
/**
* probe ipmib.ForwDatagrams - Count forwarded packet
* @skb: pointer to the struct sk_buff being acted on
* @op: value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* ipmib_filter_key(). If the packet passes the filter is is
* counted in the global @ForwDatagrams (equivalent to SNMP's MIB
* IPSTATS_MIB_OUTFORWDATAGRAMS)
*/
%( kernel_v >= "2.6.24" %?
probe ipmib.ForwDatagrams=kernel.function("ip_forward_finish")
{
skb = $skb;
op = 1;
SourceIsLocal = 0;
try { key = ipmib_filter_key(skb, op, SourceIsLocal) } catch { }
if ( key ) ForwDatagrams[key] += op;
}
%)
/**
* probe ipmib.OutRequests - Count a request to send a packet
* @skb: pointer to the struct sk_buff being acted on
* @op: value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* ipmib_filter_key(). If the packet passes the filter is is
* counted in the global @OutRequests (equivalent to SNMP's MIB
* IPSTATS_MIB_OUTREQUESTS)
*/
probe ipmib.OutRequests=kernel.function("ip_output"),
kernel.function("ip_mc_output")
{
skb = @choose_defined($skb, kernel_pointer($pskb));
op = 1;
SourceIsLocal = 1;
try { key = ipmib_filter_key(skb, op, SourceIsLocal) } catch { }
if ( key ) OutRequests[key] += op;
}
/**
* probe ipmib.ReasmTimeout - Count Reassembly Timeouts
* @skb: pointer to the struct sk_buff being acted on
* @op: value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* ipmib_filter_key(). If the packet passes the filter is is
* counted in the global @ReasmTimeout (equivalent to SNMP's MIB
* IPSTATS_MIB_REASMTIMEOUT)
*/
probe ipmib.ReasmTimeout=kernel.function("icmp_send")
{
skb = $skb_in;
op = 0;
SourceIsLocal = 1;
if(($type==_icmp_time_exceeded())&&($code==_icmp_exc_fragtime())){
try {
key = ipmib_filter_key(skb, op, SourceIsLocal)
} catch { }
if ( key ) ReasmTimeout[key] += op;
}
}
/**
* probe ipmib.ReasmReqds - Count number of packet fragments reassembly requests
* @skb: pointer to the struct sk_buff being acted on
* @op: value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* ipmib_filter_key(). If the packet passes the filter is is
* counted in the global @ReasmReqds (equivalent to SNMP's MIB
* IPSTATS_MIB_REASMREQDS)
*/
probe ipmib.ReasmReqds=kernel.function("ip_defrag")
{
skb = $skb;
op = 0;
SourceIsLocal = 1;
try { key = ipmib_filter_key(skb, op, SourceIsLocal) } catch { }
if ( key ) ReasmReqds[key] += op;
}
/**
* probe ipmib.FragOKs - Count datagram fragmented successfully
* @skb: pointer to the struct sk_buff being acted on
* @op: value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* ipmib_filter_key(). If the packet passes the filter is is
* counted in the global @FragOKs (equivalent to SNMP's MIB
* IPSTATS_MIB_FRAGOKS)
*/
probe ipmib.FragOKs=kernel.function("ip_fragment").return
{
skb = @entry($skb);
op = 1;
SourceIsLocal = 1;
if ( $return ) next
try { key = ipmib_filter_key(skb, op, SourceIsLocal) } catch { }
if ( key ) FragOKs [key] += op;
}
/**
* probe ipmib.FragFails - Count datagram fragmented unsuccessfully
* @skb: pointer to the struct sk_buff being acted on
* @op: Value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* ipmib_filter_key(). If the packet passes the filter is is
* counted in the global @FragFails (equivalent to SNMP's MIB
* IPSTATS_MIB_FRAGFAILS)
*/
probe ipmib.FragFails=kernel.function("ip_fragment").return
{
skb = @entry($skb);
op = 1;
SourceIsLocal = 1;
if (!$return ) next
try { key = ipmib_filter_key(skb, op, SourceIsLocal) } catch { }
if ( key ) FragFails [key] += op;
}
@__private30 function _rtn_unspec:long ()
{
return @const("RTN_UNSPEC")
}
function _input_route_type:long (skb:long)
{
rt = @choose_defined(@cast(skb, "sk_buff")->_skb_dst,
@choose_defined(@cast(skb, "sk_buff")->rtable, 0))
return rt ? @cast(rt, "rtable")->rt_type : _rtn_unspec()
}
@__private30 function _output_route_type:long (skb:long)
{
rt = @choose_defined(@cast(skb, "sk_buff")->_skb_dst,
@choose_defined(@cast(skb, "sk_buff")->dst, 0))
return rt ? @cast(rt, "rtable")->rt_type : _rtn_unspec()
}