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ip-xfrm: add support for oseq-may-wrap extra flag 

This flag allows to create SA where sequence number can cycle in
outbound packets if set.

Signed-off-by: Petr Vaněk <pv@excello.cz>
Signed-off-by: David Ahern <dsahern@kernel.org>
This commit is contained in:
Petr Vaněk 2020-07-31 09:12:59 +02:00 committed by David Ahern
parent 91922a4121
commit a7f1974f6e
3 changed files with 7 additions and 2 deletions
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3
ip/ipxfrm.c
View File

@ -953,6 +953,9 @@ void xfrm_state_info_print(struct xfrm_usersa_info *xsinfo,
XFRM_FLAG_PRINT(fp, extra_flags,
XFRM_SA_XFLAG_DONT_ENCAP_DSCP,
"dont-encap-dscp");
XFRM_FLAG_PRINT(fp, extra_flags,
XFRM_SA_XFLAG_OSEQ_MAY_WRAP,
"oseq-may-wrap");
if (extra_flags)
fprintf(fp, "%x", extra_flags);
}

4
ip/xfrm_state.c
View File

@ -104,7 +104,7 @@ static void usage(void)
"FLAG-LIST := [ FLAG-LIST ] FLAG\n"
"FLAG := noecn | decap-dscp | nopmtudisc | wildrecv | icmp | af-unspec | align4 | esn\n"
"EXTRA-FLAG-LIST := [ EXTRA-FLAG-LIST ] EXTRA-FLAG\n"
"EXTRA-FLAG := dont-encap-dscp\n"
"EXTRA-FLAG := dont-encap-dscp | oseq-may-wrap\n"
"SELECTOR := [ src ADDR[/PLEN] ] [ dst ADDR[/PLEN] ] [ dev DEV ] [ UPSPEC ]\n"
"UPSPEC := proto { { tcp | udp | sctp | dccp } [ sport PORT ] [ dport PORT ] |\n"
" { icmp | ipv6-icmp | mobility-header } [ type NUMBER ] [ code NUMBER ] |\n"
@ -253,6 +253,8 @@ static int xfrm_state_extra_flag_parse(__u32 *extra_flags, int *argcp, char ***a
while (1) {
if (strcmp(*argv, "dont-encap-dscp") == 0)
*extra_flags |= XFRM_SA_XFLAG_DONT_ENCAP_DSCP;
else if (strcmp(*argv, "oseq-may-wrap") == 0)
*extra_flags |= XFRM_SA_XFLAG_OSEQ_MAY_WRAP;
else {
PREV_ARG(); /* back track */
break;

2
man/man8/ip-xfrm.8
View File

@ -217,7 +217,7 @@ ip-xfrm \- transform configuration
.ti -8
.IR EXTRA-FLAG " := "
.B dont-encap-dscp
.BR dont-encap-dscp " | " oseq-may-wrap
.ti -8
.BR "ip xfrm policy" " { " add " | " update " }"