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man/man8/ip-sr.8
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Eric Biggers
man8: ip-sr: Document that passphrase must be high-entropy
27 авг 2025, 19:36
27 авг 2025, 19:36
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.TH IP\-SR 8 "14 Apr 2017" "iproute2" "Linux" .SH "NAME" ip-sr \- IPv6 Segment Routing management .SH SYNOPSIS .sp .ad l .in +8 .ti -8 .B ip sr .RI " { " COMMAND " | " .BR help " }" .sp .ti -8 .ti -8 .B ip sr hmac show .ti -8 .B ip sr hmac set .I KEYID ALGO .ti -8 .B ip sr tunsrc show .ti -8 .B ip sr tunsrc set .I ADDRESS .SH DESCRIPTION The \fBip sr\fR command is used to configure IPv6 Segment Routing (SRv6) internal parameters. .PP Those parameters include the mapping between an HMAC key ID and its associated hashing algorithm and secret, and the IPv6 address to use as source for encapsulated packets. .PP The \fBip sr hmac set\fR command prompts for a newline-terminated "passphrase" that will be used as the HMAC secret for the corresponding key ID. This "passphrase" is \fInot\fR stretched, and it is used directly as the HMAC key. Therefore it \fImust\fR have enough entropy to be used as a key. For example, a correct use would be to use a passphrase that was generated using \fBhead\~-c\~32\~/dev/random\~|\~base64\~-w\~0\fR. .PP A blank "passphrase" removes the mapping. .PP The currently supported algorithms for \fIALGO\fR are \fBsha1\fR and \fBsha256\fR. .PP If the tunnel source is set to the address :: (which is the default), then an address of the egress interface will be selected. As this operation may hinder performances, it is recommended to set a non-default address. .SH EXAMPLES .PP .SS Configure an HMAC mapping for key ID 42 and hashing algorithm SHA-256 .nf # ip sr hmac set 42 sha256 .PP .SS Set the tunnel source address to 2001:db8::1 .nf # ip sr tunsrc set 2001:db8::1 .SH SEE ALSO .br .BR ip-route (8) .SH BUGS \fBip sr hmac set\fR does not stretch the passphrase. .SH AUTHOR David Lebrun <david.lebrun@uclouvain.be>