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authorXin Long <lucien.xin@gmail.com>2021-06-22 14:04:52 -0400
committerDavid S. Miller <davem@davemloft.net>2021-06-22 11:28:52 -0700
commitfe59379b9ab7ddad157f5379fa47dbf84c9b5e09 (patch)
tree53972eaae7c47412ba8aca07bd05b18af1b2b7aa /include/net/sctp
parent92548ec2f1f92d0c0b60ce59592b645571672568 (diff)
sctp: do the basic send and recv for PLPMTUD probe
This patch does exactly what rfc8899#section-6.2.1.2 says: The SCTP sender needs to be able to determine the total size of a probe packet. The HEARTBEAT chunk could carry a Heartbeat Information parameter that includes, besides the information suggested in [RFC4960], the probe size to help an implementation associate a HEARTBEAT ACK with the size of probe that was sent. The sender could also use other methods, such as sending a nonce and verifying the information returned also contains the corresponding nonce. The length of the PAD chunk is computed by reducing the probing size by the size of the SCTP common header and the HEARTBEAT chunk. Note that HB ACK chunk will carry back whatever HB chunk carried, including the probe_size we put it in; We also check hbinfo->probe_size in the HB ACK against link->pl.probe_size to validate this HB ACK chunk. v1->v2: - Remove the unused 'sp' and add static for sctp_packet_bundle_pad(). Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/sctp')
-rw-r--r--include/net/sctp/sm.h3
-rw-r--r--include/net/sctp/structs.h2
2 files changed, 4 insertions, 1 deletions
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index 45542e2bac93..2eb6d7c2c931 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -226,7 +226,8 @@ struct sctp_chunk *sctp_make_new_encap_port(
const struct sctp_association *asoc,
const struct sctp_chunk *chunk);
struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
- const struct sctp_transport *transport);
+ const struct sctp_transport *transport,
+ __u32 probe_size);
struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
const struct sctp_chunk *chunk,
const void *payload,
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index a3772f8ee7f6..f7b056f5af37 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -386,6 +386,7 @@ struct sctp_sender_hb_info {
union sctp_addr daddr;
unsigned long sent_at;
__u64 hb_nonce;
+ __u32 probe_size;
};
int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
@@ -657,6 +658,7 @@ struct sctp_chunk {
data_accepted:1, /* At least 1 chunk accepted */
auth:1, /* IN: was auth'ed | OUT: needs auth */
has_asconf:1, /* IN: have seen an asconf before */
+ pmtu_probe:1, /* Used by PLPMTUD, can be set in s HB chunk */
tsn_missing_report:2, /* Data chunk missing counter. */
fast_retransmit:2; /* Is this chunk fast retransmitted? */
};