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l2tp: support sequence numbering 

This patch implement and documents the user interface for
sequence numbering.

Signed-off-by: Asbjørn Sloth Tønnesen <asbjorn@asbjorn.st>
This commit is contained in:
Asbjørn Sloth Tønnesen 2016-11-16 22:45:24 +00:00 committed by Stephen Hemminger
parent 35cc6ded4f
commit 8a11421a5d
2 changed files with 38 additions and 0 deletions
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23
ip/ipl2tp.c
View File

@ -246,6 +246,12 @@ static void print_session(struct l2tp_data *data)
printf(" reorder timeout: %u\n", p->reorder_timeout);
else
printf("\n");
if (p->send_seq || p->recv_seq) {
printf(" sequence numbering:");
if (p->send_seq) printf(" send");
if (p->recv_seq) printf(" recv");
printf("\n");
}
}
static int get_response(struct nlmsghdr *n, void *arg)
@ -482,6 +488,7 @@ static void usage(void)
fprintf(stderr, " session_id ID peer_session_id ID\n");
fprintf(stderr, " [ cookie HEXSTR ] [ peer_cookie HEXSTR ]\n");
fprintf(stderr, " [ offset OFFSET ] [ peer_offset OFFSET ]\n");
fprintf(stderr, " [ seq { none | send | recv | both } ]\n");
fprintf(stderr, " [ l2spec_type L2SPEC ]\n");
fprintf(stderr, " ip l2tp del tunnel tunnel_id ID\n");
fprintf(stderr, " ip l2tp del session tunnel_id ID session_id ID\n");
@ -652,6 +659,22 @@ static int parse_args(int argc, char **argv, int cmd, struct l2tp_parm *p)
fprintf(stderr, "Unknown layer2specific header type \"%s\"\n", *argv);
exit(-1);
}
} else if (strcmp(*argv, "seq") == 0) {
NEXT_ARG();
if (strcasecmp(*argv, "both") == 0) {
p->recv_seq = 1;
p->send_seq = 1;
} else if (strcasecmp(*argv, "recv") == 0) {
p->recv_seq = 1;
} else if (strcasecmp(*argv, "send") == 0) {
p->send_seq = 1;
} else if (strcasecmp(*argv, "none") == 0) {
p->recv_seq = 0;
p->send_seq = 0;
} else {
fprintf(stderr, "Unknown seq value \"%s\"\n", *argv);
exit(-1);
}
} else if (strcmp(*argv, "tunnel") == 0) {
p->tunnel = 1;
} else if (strcmp(*argv, "session") == 0) {

15
man/man8/ip-l2tp.8
View File

@ -51,6 +51,8 @@ ip-l2tp - L2TPv3 static unmanaged tunnel configuration
.br
.RB "[ " l2spec_type " { " none " | " default " } ]"
.br
.RB "[ " seq " { " none " | " send " | " recv " | " both " } ]"
.br
.RB "[ " offset
.IR OFFSET
.RB " ] [ " peer_offset
@ -238,6 +240,19 @@ set the layer2specific header type of the session.
Valid values are:
.BR none ", " default "."
.TP
.BI seq " SEQ"
controls sequence numbering to prevent or detect out of order packets.
.B send
puts a sequence number in the default layer2specific header of each
outgoing packet.
.B recv
reorder packets if they are received out of order.
Default is
.BR none "."
.br
Valid values are:
.BR none ", " send ", " recv ", " both "."
.TP
.BI offset " OFFSET"
sets the byte offset from the L2TP header where user data starts in
transmitted L2TP data packets. This is hardly ever used. If set, the