tools/testing/selftests/net/netfilter/packetdrill/conntrack_rst_invalid.pkt

Source file repositories/reference/linux-study-clean/tools/testing/selftests/net/netfilter/packetdrill/conntrack_rst_invalid.pkt

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/net/netfilter/packetdrill/conntrack_rst_invalid.pkt
Extension
.pkt
Size
1922 bytes
Lines
60
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// check that out of window resets are marked as INVALID and conntrack remains
// in ESTABLISHED state.

`packetdrill/common.sh`

+0 `$xtables -A INPUT -p tcp -m conntrack --ctstate INVALID -j DROP`
+0 `$xtables -A OUTPUT -p tcp -m conntrack --ctstate INVALID -j DROP`

+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0

0.1 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)

0.1 > S 0:0(0) win 65535 <mss 1460,sackOK,TS val 1 ecr 0,nop,wscale 8>

+0.1 < S. 1:1(0) ack 1 win 65535 <mss 1460>

+0 > . 1:1(0) ack 1 win 65535
+0 < . 1:1001(1000) ack 1 win 65535
+0 < . 1001:2001(1000) ack 1 win 65535
+0 < . 2001:3001(1000) ack 1 win 65535

+0 > . 1:1(0) ack 1001 win 65535
+0 > . 1:1(0) ack 2001 win 65535
+0 > . 1:1(0) ack 3001 win 65535

+0 write(3, ..., 1000) = 1000

// out of window
+0.0 < R	0:0(0)	win 0
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q ESTABLISHED`

// out of window
+0.0 < R	1000000:1000000(0)	win 0
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q ESTABLISHED`

// in-window but not exact match
+0.0 < R	42:42(0)	win 0
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q ESTABLISHED`

+0.0 > P. 1:1001(1000) ack 3001 win 65535

+0.1 read(3, ..., 1000) = 1000
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q ESTABLISHED`

+0 < . 3001:3001(0) ack 1001 win 65535

+0.0 < R. 3000:3000(0) ack 1001 win 0
+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q ESTABLISHED`

// exact next sequence
+0.0 < R. 3001:3001(0) ack 1001 win 0
// Conntrack should move to CLOSE

// Expect four invalid RSTs
+0 `$xtables -v -S INPUT  | grep INVALID | grep -q -- "-c 4 "`
+0 `$xtables -v -S OUTPUT | grep INVALID | grep -q -- "-c 0 0"`

+0 `conntrack -f $NFCT_IP_VERSION -L -p tcp --dport 8080 2>/dev/null |grep -q CLOSE\ `

Annotation

Implementation Notes