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/* netfilter.stp - netfilter hook tapset
*
* Copyright (C) 2012 Red Hat Inc.
* <tapsetdescription>
* This family of probe points provides a simple way to examine network traffic using the netfilter hooks mechanism.
* </tapsetdescription>
*/
/* The below functionality is mostly inspired by tcp.stp and networking.stp. */
%{
#include <linux/in.h>
#include <linux/skbuff.h>
#include <linux/netfilter_arp.h>
#include <linux/if_arp.h>
#include <net/ipv6.h>
#include <net/llc_pdu.h>
#include <linux/llc.h>
%}
# XXX: IPPROTO_* and NF_* constants should be secure globals -- needs PR10607
# ... currently we use a hideous copypasta hack which defines them as
# locals in each probe alias. Blegh
function __mac_addr_to_string:string(addr:long) {
return sprintf("%02x:%02x:%02x:%02x:%02x:%02x",
kernel_char(addr)&255, kernel_char(addr+1)&255,
kernel_char(addr+2)&255, kernel_char(addr+3)&255,
kernel_char(addr+4)&255, kernel_char(addr+5)&255)
}
function __get_mac_addr:string(addr:long) {
return __mac_addr_to_string(@cast(addr, "struct net_device", "kernel<linux/netdevice.h>")->dev_addr)
}
function __get_skb_arphdr:long(addr:long)
{
// The method is exactly the same as for an IP header:
return __get_skb_iphdr(addr)
}
/* returns the bridge header for kernel >= 2.6.21 */
function __get_skb_brhdr_new:long(skb:long)
%{ /* pure */
struct sk_buff *skb;
skb = (struct sk_buff *)(long)STAP_ARG_skb;
/* as done by skb_network_header() */
#ifdef NET_SKBUFF_DATA_USES_OFFSET
STAP_RETVALUE = (long)(kread(&(skb->head)) + kread(&(skb->network_header)) + sizeof(struct llc_pdu_un));
#else
STAP_RETVALUE = (long)(kread(&(skb->network_header)) + sizeof(struct llc_pdu_un));
#endif
CATCH_DEREF_FAULT();
%}
/* returns the bridge header for a given sk_buff structure */
function __get_skb_brhdr:long(skb:long)
{
%( kernel_v < "2.6.21" %?
brhdr = @cast(skb, "sk_buff")->mac->raw + %{ /* pure */ sizeof(struct llc_pdu_un) %}
return brhdr
%:
return __get_skb_brhdr_new(skb)
%)
}
/* returns llc_pdu_un for a given sk_buff structure */
function __get_skb_llc:long(skb:long)
%{ /* pure */
struct sk_buff *skb;
skb = (struct sk_buff *)(long)STAP_ARG_skb;
/* as done by skb_network_header() */
#ifdef NET_SKBUFF_DATA_USES_OFFSET
STAP_RETVALUE = (long)(kread(&(skb->head)) + kread(&(skb->network_header)));
#else
STAP_RETVALUE = (long)kread(&(skb->network_header));
#endif
CATCH_DEREF_FAULT();
%}
function __ip6_skb_proto:long(addr:long)
%{ /* pure */
struct sk_buff *skb = (struct sk_buff *)(uintptr_t)STAP_ARG_addr;
struct ipv6hdr *hdr;
u8 nexthdr;
/* We call deref() here to ensure the memory at the skb location
* is valid to read, to avoid potential kernel panic calling ipv6_hdr(). */
(void)kderef_buffer(NULL, skb, sizeof(struct sk_buff));
hdr = ipv6_hdr(skb);
nexthdr = kread(&(hdr->nexthdr));
if (ipv6_ext_hdr(nexthdr)) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,3,0)
long result = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr);
#else
__be16 frag_offp;
int extoff = (u8 *)(hdr + 1) - kread(&(skb->data));
long result = ipv6_skip_exthdr(skb, extoff, &nexthdr, &frag_offp);
#endif
STAP_RETVALUE = result < 0 ? 0 : result;
} else {
STAP_RETVALUE = 0;
}
CATCH_DEREF_FAULT();
%}
@define netfilter_common_setup(pf_name) %(
pf = @pf_name
/* XXX not relevant for netfilter.arp & netfilter.bridge probes */
ipproto_tcp = %{ /* pure */ IPPROTO_TCP %}
ipproto_udp = %{ /* pure */ IPPROTO_UDP %}
/* from include/linux/netfilter.h: */
nf_drop = 0
nf_accept = 1
nf_stolen = 2
nf_queue = 3
nf_repeat = 4
nf_stop = 5
indev = & @cast($in, "struct net_device", "kernel<linux/netdevice.h>")
outdev = & @cast($out, "struct net_device", "kernel<linux/netdevice.h>")
indev_name = kernel_string2(indev->name, "")
outdev_name = kernel_string2(outdev->name, "")
if (indev) {
indev_mac_len = indev->addr_len
in_mac = __get_mac_addr(indev)
}
if (outdev) {
outdev_mac_len = outdev->addr_len
out_mac = __get_mac_addr(outdev)
}
%)
@define netfilter_ip4_setup %(
iphdr = __get_skb_iphdr($skb)
family = %{ /* pure */ AF_INET %}
saddr = format_ipaddr(__ip_skb_saddr(iphdr), %{ /* pure */ AF_INET %})
daddr = format_ipaddr(__ip_skb_daddr(iphdr), %{ /* pure */ AF_INET %})
protocol = __ip_skb_proto(iphdr)
length = @cast($skb, "struct sk_buff", "kernel<linux/skbuff.h>")->len
tcphdr = __get_skb_tcphdr($skb)
if (protocol == ipproto_tcp) {
dport = __tcp_skb_dport(tcphdr)
sport = __tcp_skb_sport(tcphdr)
urg = __tcp_skb_urg(tcphdr)
ack = __tcp_skb_ack(tcphdr)
psh = __tcp_skb_psh(tcphdr)
rst = __tcp_skb_rst(tcphdr)
syn = __tcp_skb_syn(tcphdr)
fin = __tcp_skb_fin(tcphdr)
}
/* udphdr is in the same place where tcphdr would have been */
udphdr = & @cast(tcphdr, "udphdr", "kernel<linux/udp.h>")
if (protocol == ipproto_udp) {
dport = ntohs(udphdr->dest)
sport = ntohs(udphdr->source)
}
%)
@define netfilter_ip6_setup %(
iphdr = &@cast(__get_skb_iphdr($skb), "ipv6hdr", "kernel<linux/ipv6.h>")
family = %{ /* pure */ AF_INET6 %}
saddr = format_ipaddr(&iphdr->saddr, %{ /* pure */ AF_INET6 %})
daddr = format_ipaddr(&iphdr->daddr, %{ /* pure */ AF_INET6 %})
protocol = __ip6_skb_proto($skb)
length = @cast($skb, "struct sk_buff", "kernel<linux/skbuff.h>")->len
tcphdr = __get_skb_tcphdr($skb)
if (protocol == ipproto_tcp) {
dport = __tcp_skb_dport(tcphdr)
sport = __tcp_skb_sport(tcphdr)
urg = __tcp_skb_urg(tcphdr)
ack = __tcp_skb_ack(tcphdr)
psh = __tcp_skb_psh(tcphdr)
rst = __tcp_skb_rst(tcphdr)
syn = __tcp_skb_syn(tcphdr)
fin = __tcp_skb_fin(tcphdr)
}
/* udphdr is in the same place where tcphdr would have been */
udphdr = & @cast(tcphdr, "udphdr", "kernel<linux/udp.h>")
if (protocol == ipproto_udp) {
dport = ntohs(udphdr->dest)
sport = ntohs(udphdr->source)
}
%)
/**
* probe netfilter.ip.pre_routing - Called before an IP packet is routed
* @pf: Protocol family - either 'ipv4' or 'ipv6'
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @length: The length of the packet buffer contents, in bytes
* @iphdr: Address of IP header
* @protocol: Packet protocol from driver (ipv4 only)
* @ipproto_tcp: Constant used to signify that the packet protocol is TCP
* @ipproto_udp: Constant used to signify that the packet protocol is UDP
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
* @family: IP address family
* @saddr: A string representing the source IP address
* @daddr: A string representing the destination IP address
* @sport: TCP or UDP source port (ipv4 only)
* @dport: TCP or UDP destination port (ipv4 only)
* @urg: TCP URG flag (if protocol is TCP; ipv4 only)
* @ack: TCP ACK flag (if protocol is TCP; ipv4 only)
* @psh: TCP PSH flag (if protocol is TCP; ipv4 only)
* @rst: TCP RST flag (if protocol is TCP; ipv4 only)
* @syn: TCP SYN flag (if protocol is TCP; ipv4 only)
* @fin: TCP FIN flag (if protocol is TCP; ipv4 only)
*/
probe netfilter.ip.pre_routing = netfilter.ipv4.pre_routing,
netfilter.ipv6.pre_routing
{
}
probe netfilter.ipv4.pre_routing
= netfilter.hook("NF_INET_PRE_ROUTING").pf("NFPROTO_IPV4")
{
@netfilter_common_setup("ipv4")
@netfilter_ip4_setup
}
probe netfilter.ipv6.pre_routing
= netfilter.hook("NF_IP6_PRE_ROUTING").pf("NFPROTO_IPV6")
{
@netfilter_common_setup("ipv6")
@netfilter_ip6_setup
}
/**
* probe netfilter.ip.local_in - Called on an incoming IP packet addressed to the local computer
* @pf: Protocol family -- either "ipv4" or "ipv6"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @length: The length of the packet buffer contents, in bytes
* @iphdr: Address of IP header
* @protocol: Packet protocol from driver (ipv4 only)
* @ipproto_tcp: Constant used to signify that the packet protocol is TCP
* @ipproto_udp: Constant used to signify that the packet protocol is UDP
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
* @family: IP address family
* @saddr: A string representing the source IP address
* @daddr: A string representing the destination IP address
* @sport: TCP or UDP source port (ipv4 only)
* @dport: TCP or UDP destination port (ipv4 only)
* @urg: TCP URG flag (if protocol is TCP; ipv4 only)
* @ack: TCP ACK flag (if protocol is TCP; ipv4 only)
* @psh: TCP PSH flag (if protocol is TCP; ipv4 only)
* @rst: TCP RST flag (if protocol is TCP; ipv4 only)
* @syn: TCP SYN flag (if protocol is TCP; ipv4 only)
* @fin: TCP FIN flag (if protocol is TCP; ipv4 only)
*/
probe netfilter.ip.local_in = netfilter.ipv4.local_in,
netfilter.ipv6.local_in
{
}
probe netfilter.ipv4.local_in
= netfilter.hook("NF_INET_LOCAL_IN").pf("NFPROTO_IPV4")
{
@netfilter_common_setup("ipv4")
@netfilter_ip4_setup
}
probe netfilter.ipv6.local_in
= netfilter.hook("NF_IP6_LOCAL_IN").pf("NFPROTO_IPV6")
{
@netfilter_common_setup("ipv6")
@netfilter_ip6_setup
}
/**
* probe netfilter.ip.forward - Called on an incoming IP packet addressed to some other computer
* @pf: Protocol family -- either "ipv4" or "ipv6"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @length: The length of the packet buffer contents, in bytes
* @iphdr: Address of IP header
* @protocol: Packet protocol from driver (ipv4 only)
* @ipproto_tcp: Constant used to signify that the packet protocol is TCP
* @ipproto_udp: Constant used to signify that the packet protocol is UDP
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
* @family: IP address family
* @saddr: A string representing the source IP address
* @daddr: A string representing the destination IP address
* @sport: TCP or UDP source port (ipv4 only)
* @dport: TCP or UDP destination port (ipv4 only)
* @urg: TCP URG flag (if protocol is TCP; ipv4 only)
* @ack: TCP ACK flag (if protocol is TCP; ipv4 only)
* @psh: TCP PSH flag (if protocol is TCP; ipv4 only)
* @rst: TCP RST flag (if protocol is TCP; ipv4 only)
* @syn: TCP SYN flag (if protocol is TCP; ipv4 only)
* @fin: TCP FIN flag (if protocol is TCP; ipv4 only)
*/
probe netfilter.ip.forward = netfilter.ipv4.forward,
netfilter.ipv6.forward
{
}
probe netfilter.ipv4.forward
= netfilter.hook("NF_INET_FORWARD").pf("NFPROTO_IPV4")
{
@netfilter_common_setup("ipv4")
@netfilter_ip4_setup
}
probe netfilter.ipv6.forward
= netfilter.hook("NF_IP6_FORWARD").pf("NFPROTO_IPV6")
{
@netfilter_common_setup("ipv6")
@netfilter_ip6_setup
}
/**
* probe netfilter.ip.local_out - Called on an outgoing IP packet
* @pf: Protocol family -- either "ipv4" or "ipv6"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @length: The length of the packet buffer contents, in bytes
* @iphdr: Address of IP header
* @protocol: Packet protocol from driver (ipv4 only)
* @ipproto_tcp: Constant used to signify that the packet protocol is TCP
* @ipproto_udp: Constant used to signify that the packet protocol is UDP
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
* @family: IP address family
* @saddr: A string representing the source IP address
* @daddr: A string representing the destination IP address
* @sport: TCP or UDP source port (ipv4 only)
* @dport: TCP or UDP destination port (ipv4 only)
* @urg: TCP URG flag (if protocol is TCP; ipv4 only)
* @ack: TCP ACK flag (if protocol is TCP; ipv4 only)
* @psh: TCP PSH flag (if protocol is TCP; ipv4 only)
* @rst: TCP RST flag (if protocol is TCP; ipv4 only)
* @syn: TCP SYN flag (if protocol is TCP; ipv4 only)
* @fin: TCP FIN flag (if protocol is TCP; ipv4 only)
*/
probe netfilter.ip.local_out = netfilter.ipv4.local_out,
netfilter.ipv6.local_out
{
}
probe netfilter.ipv4.local_out
= netfilter.hook("NF_INET_LOCAL_OUT").pf("NFPROTO_IPV4")
{
@netfilter_common_setup("ipv4")
@netfilter_ip4_setup
}
probe netfilter.ipv6.local_out
= netfilter.hook("NF_IP6_LOCAL_OUT").pf("NFPROTO_IPV6")
{
@netfilter_common_setup("ipv6")
@netfilter_ip6_setup
}
/**
* probe netfilter.ip.post_routing - Called immediately before an outgoing IP packet leaves the computer
* @pf: Protocol family -- either "ipv4" or "ipv6"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @length: The length of the packet buffer contents, in bytes
* @iphdr: Address of IP header
* @protocol: Packet protocol from driver (ipv4 only)
* @ipproto_tcp: Constant used to signify that the packet protocol is TCP
* @ipproto_udp: Constant used to signify that the packet protocol is UDP
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
* @family: IP address family
* @saddr: A string representing the source IP address
* @daddr: A string representing the destination IP address
* @sport: TCP or UDP source port (ipv4 only)
* @dport: TCP or UDP destination port (ipv4 only)
* @urg: TCP URG flag (if protocol is TCP; ipv4 only)
* @ack: TCP ACK flag (if protocol is TCP; ipv4 only)
* @psh: TCP PSH flag (if protocol is TCP; ipv4 only)
* @rst: TCP RST flag (if protocol is TCP; ipv4 only)
* @syn: TCP SYN flag (if protocol is TCP; ipv4 only)
* @fin: TCP FIN flag (if protocol is TCP; ipv4 only)
*/
probe netfilter.ip.post_routing = netfilter.ipv4.post_routing,
netfilter.ipv6.local_out
{
}
probe netfilter.ipv4.post_routing
= netfilter.hook("NF_INET_POST_ROUTING").pf("NFPROTO_IPV4")
{
@netfilter_common_setup("ipv4")
@netfilter_ip4_setup
}
probe netfilter.ipv6.post_routing
= netfilter.hook("NF_IP6_POST_ROUTING").pf("NFPROTO_IPV6")
{
@netfilter_common_setup("ipv6")
@netfilter_ip6_setup
}
@define netfilter_arp_setup %(
# XXX: include functionality to parse ARP packet contents
arphdr = & @cast(__get_skb_arphdr($skb), "struct arphdr", "kernel<linux/if_arp.h>")
family = %{ /* pure */ NF_ARP %} // from linux/netfilter_arp.h
ar_hrd = ntohs(arphdr->ar_hrd)
ar_pro = ntohs(arphdr->ar_pro)
ar_hln = arphdr->ar_hln
ar_pln = arphdr->ar_pln
ar_op = ntohs(arphdr->ar_op)
ar_data = arphdr + 8
if (ar_hrd == 0x001 && ar_pro == 0x800) {
/* additional info available for most common (Ethernet+IP) case: */
ar_sha = __mac_addr_to_string(ar_data)
ar_sip = format_ipaddr(kernel_int(ar_data + 6), %{ /* pure */ AF_INET %})
ar_tha = __mac_addr_to_string(ar_data + 10)
ar_tip = format_ipaddr(kernel_int(ar_data + 16), %{ /* pure */ AF_INET %})
}
/* XXX support for additional cases? */
length = @cast($skb, "struct sk_buff", "kernel<linux/skbuff.h>")->len
%)
/**
* probe netfilter.arp.in -- Called for each incoming ARP packet
* @pf: Protocol family -- always "arp"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @length: The length of the packet buffer contents, in bytes
* @arphdr: Address of ARP header
* @ar_hrd: Format of hardware address
* @ar_pro: Format of protocol address
* @ar_hln: Length of hardware address
* @ar_pln: Length of protocol address
* @ar_op: ARP opcode (command)
* @ar_data: Address of ARP packet data region (after the header)
* @ar_sha: Ethernet+IP only (ar_pro==0x800): source hardware (MAC) address
* @ar_sip: Ethernet+IP only (ar_pro==0x800): source IP address
* @ar_tha: Ethernet+IP only (ar_pro==0x800): target hardware (MAC) address
* @ar_tip: Ethernet+IP only (ar_pro==0x800): target IP address
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
*/
probe netfilter.arp.in = netfilter.hook("NF_ARP_IN").pf("NFPROTO_ARP")
{
@netfilter_common_setup("arp")
@netfilter_arp_setup
}
/**
* probe netfilter.arp.out -- Called for each outgoing ARP packet
* @pf: Protocol family -- always "arp"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @length: The length of the packet buffer contents, in bytes
* @arphdr: Address of ARP header
* @ar_hrd: Format of hardware address
* @ar_pro: Format of protocol address
* @ar_hln: Length of hardware address
* @ar_pln: Length of protocol address
* @ar_op: ARP opcode (command)
* @ar_data: Address of ARP packet data region (after the header)
* @ar_sha: Ethernet+IP only (ar_pro==0x800): source hardware (MAC) address
* @ar_sip: Ethernet+IP only (ar_pro==0x800): source IP address
* @ar_tha: Ethernet+IP only (ar_pro==0x800): target hardware (MAC) address
* @ar_tip: Ethernet+IP only (ar_pro==0x800): target IP address
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
*/
probe netfilter.arp.out = netfilter.hook("NF_ARP_OUT").pf("NFPROTO_ARP")
{
@netfilter_common_setup("arp")
@netfilter_arp_setup
}
/**
* probe netfilter.arp.forward -- Called for each ARP packet to be forwarded
* @pf: Protocol family -- always "arp"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @length: The length of the packet buffer contents, in bytes
* @arphdr: Address of ARP header
* @ar_hrd: Format of hardware address
* @ar_pro: Format of protocol address
* @ar_hln: Length of hardware address
* @ar_pln: Length of protocol address
* @ar_op: ARP opcode (command)
* @ar_data: Address of ARP packet data region (after the header)
* @ar_sha: Ethernet+IP only (ar_pro==0x800): source hardware (MAC) address
* @ar_sip: Ethernet+IP only (ar_pro==0x800): source IP address
* @ar_tha: Ethernet+IP only (ar_pro==0x800): target hardware (MAC) address
* @ar_tip: Ethernet+IP only (ar_pro==0x800): target IP address
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
*/
probe netfilter.arp.forward = netfilter.hook("NF_ARP_FORWARD").pf("NFPROTO_ARP")
{
@netfilter_common_setup("arp")
@netfilter_arp_setup
}
@define netfilter_bridge_setup %(
llcpdu = &@cast(__get_skb_llc($skb), "struct llc_pdu_un", "kernel<net/llc_pdu.h>")
brhdr = __get_skb_brhdr($skb)
llcproto_stp = %{ /* pure */ LLC_SAP_BSPAN %} // from linux/llc.h
if (llcpdu->dsap == llcproto_stp && llcpdu->ssap == llcproto_stp) {
protocol = llcproto_stp
br_prid = ntohs(kernel_short(brhdr))
br_vid = kernel_char(brhdr + 2)
br_type = kernel_char(brhdr + 3)
br_flags = kernel_char(brhdr + 4)
br_rid = kernel_long(brhdr + 5)
br_rmac = __mac_addr_to_string(brhdr + 7)
br_cost = ntohl(kernel_int(brhdr + 13))
br_bid = kernel_long(brhdr + 17)
br_mac = __mac_addr_to_string(brhdr + 19)
br_poid = ntohs(kernel_short(brhdr + 25))
br_msg = ntohs(kernel_short(brhdr + 27))
br_max = ntohs(kernel_short(brhdr + 29))
br_htime = ntohs(kernel_short(brhdr + 31))
br_fd = ntohs(kernel_short(brhdr + 33))
}
length = @cast($skb, "struct sk_buff", "kernel<linux/skbuff.h>")->len
%)
/**
* probe netfilter.bridge.pre_routing -- Called before a bridging packet is routed
* @pf: Protocol family -- always "bridge"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @llcpdu: Address of LLC Protocol Data Unit
* @brhdr: Address of bridge header
* @llcproto_stp: Constant used to signify Bridge Spanning Tree Protocol packet
* @protocol: Packet protocol
* @br_prid: Protocol identifier
* @br_vid: Protocol version identifier
* @br_type: BPDU type
* @br_flags: BPDU flags
* @br_rid: Identity of root bridge
* @br_rmac: Root bridge MAC address
* @br_cost: Total cost from transmitting bridge to root
* @br_bid: Identity of bridge
* @br_mac: Bridge MAC address
* @br_poid: Port identifier
* @br_msg: Message age in 1/256 secs
* @br_max: Max age in 1/256 secs
* @br_htime: Hello time in 1/256 secs
* @br_fd: Forward delay in 1/256 secs
* @length: The length of the packet buffer contents, in bytes
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
*/
probe netfilter.bridge.pre_routing
= netfilter.hook("NF_BR_PRE_ROUTING").pf("NFPROTO_BRIDGE")
{
@netfilter_common_setup("bridge")
@netfilter_bridge_setup
}
/**
* probe netfilter.bridge.local_in - Called on a bridging packet destined for the local computer
* @pf: Protocol family -- always "bridge"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @llcpdu: Address of LLC Protocol Data Unit
* @brhdr: Address of bridge header
* @llcproto_stp: Constant used to signify Bridge Spanning Tree Protocol packet
* @protocol: Packet protocol
* @br_prid: Protocol identifier
* @br_vid: Protocol version identifier
* @br_type: BPDU type
* @br_flags: BPDU flags
* @br_rid: Identity of root bridge
* @br_rmac: Root bridge MAC address
* @br_cost: Total cost from transmitting bridge to root
* @br_bid: Identity of bridge
* @br_mac: Bridge MAC address
* @br_poid: Port identifier
* @br_msg: Message age in 1/256 secs
* @br_max: Max age in 1/256 secs
* @br_htime: Hello time in 1/256 secs
* @br_fd: Forward delay in 1/256 secs
* @length: The length of the packet buffer contents, in bytes
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
*/
probe netfilter.bridge.local_in
= netfilter.hook("NF_BR_LOCAL_IN").pf("NFPROTO_BRIDGE")
{
@netfilter_common_setup("bridge")
@netfilter_bridge_setup
}
/**
* probe netfilter.bridge.forward - Called on an incoming bridging packet destined for some other computer
* @pf: Protocol family -- always "bridge"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @llcpdu: Address of LLC Protocol Data Unit
* @brhdr: Address of bridge header
* @llcproto_stp: Constant used to signify Bridge Spanning Tree Protocol packet
* @protocol: Packet protocol
* @br_prid: Protocol identifier
* @br_vid: Protocol version identifier
* @br_type: BPDU type
* @br_flags: BPDU flags
* @br_rid: Identity of root bridge
* @br_rmac: Root bridge MAC address
* @br_cost: Total cost from transmitting bridge to root
* @br_bid: Identity of bridge
* @br_mac: Bridge MAC address
* @br_poid: Port identifier
* @br_msg: Message age in 1/256 secs
* @br_max: Max age in 1/256 secs
* @br_htime: Hello time in 1/256 secs
* @br_fd: Forward delay in 1/256 secs
* @length: The length of the packet buffer contents, in bytes
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
*/
probe netfilter.bridge.forward
= netfilter.hook("NF_BR_FORWARD").pf("NFPROTO_BRIDGE")
{
@netfilter_common_setup("bridge")
@netfilter_bridge_setup
}
/**
* probe netfilter.bridge.local_out - Called on a bridging packet coming from a local process
* @pf: Protocol family -- always "bridge"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @llcpdu: Address of LLC Protocol Data Unit
* @brhdr: Address of bridge header
* @llcproto_stp: Constant used to signify Bridge Spanning Tree Protocol packet
* @protocol: Packet protocol
* @br_prid: Protocol identifier
* @br_vid: Protocol version identifier
* @br_type: BPDU type
* @br_flags: BPDU flags
* @br_rid: Identity of root bridge
* @br_rmac: Root bridge MAC address
* @br_cost: Total cost from transmitting bridge to root
* @br_bid: Identity of bridge
* @br_mac: Bridge MAC address
* @br_poid: Port identifier
* @br_msg: Message age in 1/256 secs
* @br_max: Max age in 1/256 secs
* @br_htime: Hello time in 1/256 secs
* @br_fd: Forward delay in 1/256 secs
* @length: The length of the packet buffer contents, in bytes
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
*/
probe netfilter.bridge.local_out
= netfilter.hook("NF_BR_LOCAL_OUT").pf("NFPROTO_BRIDGE")
{
@netfilter_common_setup("bridge")
@netfilter_bridge_setup
}
/**
* probe netfilter.bridge.post_routing -- Called before a bridging packet hits the wire
* @pf: Protocol family -- always "bridge"
* @indev: Address of net_device representing input device, 0 if unknown
* @outdev: Address of net_device representing output device, 0 if unknown
* @indev_name: Name of network device packet was received on (if known)
* @outdev_name: Name of network device packet will be routed to (if known)
* @llcpdu: Address of LLC Protocol Data Unit
* @brhdr: Address of bridge header
* @llcproto_stp: Constant used to signify Bridge Spanning Tree Protocol packet
* @protocol: Packet protocol
* @br_prid: Protocol identifier
* @br_vid: Protocol version identifier
* @br_type: BPDU type
* @br_flags: BPDU flags
* @br_rid: Identity of root bridge
* @br_rmac: Root bridge MAC address
* @br_cost: Total cost from transmitting bridge to root
* @br_bid: Identity of bridge
* @br_mac: Bridge MAC address
* @br_poid: Port identifier
* @br_msg: Message age in 1/256 secs
* @br_max: Max age in 1/256 secs
* @br_htime: Hello time in 1/256 secs
* @br_fd: Forward delay in 1/256 secs
* @length: The length of the packet buffer contents, in bytes
* @nf_drop: Constant used to signify a 'drop' verdict
* @nf_accept: Constant used to signify an 'accept' verdict
* @nf_stolen: Constant used to signify a 'stolen' verdict
* @nf_queue: Constant used to signify a 'queue' verdict
* @nf_repeat: Constant used to signify a 'repeat' verdict
* @nf_stop: Constant used to signify a 'stop' verdict
*/
probe netfilter.bridge.post_routing
= netfilter.hook("NF_BR_POST_ROUTING").pf("NFPROTO_BRIDGE")
{
@netfilter_common_setup("bridge")
@netfilter_bridge_setup
}
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