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sctp: add support for the process of unordered idata 

Unordered idata process is more complicated than unordered data:

 - It has to add mid into sctp_stream_out to save the next mid value,
   which is separated from ordered idata's.

 - To support pd for unordered idata, another mid and pd_mode need to
   be added to save the message id and pd state in sctp_stream_in.

 - To make  unordered idata reasm easier, it adds a new event queue
   to save frags for idata.

The patch mostly adds the samilar reasm functions for unordered idata
as ordered idata's, and also adjusts some other codes on assign_mid,
abort_pd and ulpevent_data for idata.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-12-08 21:04:09 +08:00 committed by David S. Miller
parent 65f5e35783
commit 132282386f
5 changed files with 392 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/net/sctp/structs.h
View File

@ -413,6 +413,14 @@ void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new);
#define sctp_stream_in(asoc, sid) (&(asoc)->stream.in[sid])
/* What is the current MID_uo number for this stream? */
#define sctp_mid_uo_peek(stream, type, sid) \
((stream)->type[sid].mid_uo)
/* Return the next MID_uo number for this stream. */
#define sctp_mid_uo_next(stream, type, sid) \
((stream)->type[sid].mid_uo++)
/*
* Pointers to address related SCTP functions.
* (i.e. things that depend on the address family.)
@ -1379,8 +1387,9 @@ struct sctp_stream_out {
__u32 mid;
__u16 ssn;
};
__u8 state;
__u32 mid_uo;
struct sctp_stream_out_ext *ext;
__u8 state;
};
struct sctp_stream_in {
@ -1388,8 +1397,11 @@ struct sctp_stream_in {
__u32 mid;
__u16 ssn;
};
__u32 mid_uo;
__u32 fsn;
__u32 fsn_uo;
char pd_mode;
char pd_mode_uo;
};
struct sctp_stream {

1
include/net/sctp/ulpqueue.h
View File

@ -45,6 +45,7 @@ struct sctp_ulpq {
char pd_mode;
struct sctp_association *asoc;
struct sk_buff_head reasm;
struct sk_buff_head reasm_uo;
struct sk_buff_head lobby;
};

23
net/sctp/socket.c
View File

@ -201,6 +201,22 @@ static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
cb(chunk);
}
static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
void (*cb)(struct sk_buff *, struct sock *))
{
struct sk_buff *skb, *tmp;
sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
cb(skb, sk);
sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
cb(skb, sk);
sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
cb(skb, sk);
}
/* Verify that this is a valid address. */
static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
int len)
@ -1554,6 +1570,7 @@ static void sctp_close(struct sock *sk, long timeout)
if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
!skb_queue_empty(&asoc->ulpq.reasm) ||
!skb_queue_empty(&asoc->ulpq.reasm_uo) ||
(sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
struct sctp_chunk *chunk;
@ -8495,11 +8512,7 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
}
sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
sctp_skb_set_owner_r_frag(skb, newsk);
sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
sctp_skb_set_owner_r_frag(skb, newsk);
sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
/* Set the type of socket to indicate that it is peeled off from the
* original UDP-style socket or created with the accept() call on a

377
net/sctp/stream_interleave.c
View File

@ -74,12 +74,10 @@ static void sctp_chunk_assign_mid(struct sctp_chunk *chunk)
list_for_each_entry(lchunk, &chunk->msg->chunks, frag_list) {
struct sctp_idatahdr *hdr;
__u32 mid;
lchunk->has_mid = 1;
if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
continue;
hdr = lchunk->subh.idata_hdr;
if (lchunk->chunk_hdr->flags & SCTP_DATA_FIRST_FRAG)
@ -87,10 +85,16 @@ static void sctp_chunk_assign_mid(struct sctp_chunk *chunk)
else
hdr->fsn = htonl(cfsn++);
if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
hdr->mid = htonl(sctp_mid_next(stream, out, sid));
else
hdr->mid = htonl(sctp_mid_peek(stream, out, sid));
if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
mid = lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG ?
sctp_mid_uo_next(stream, out, sid) :
sctp_mid_uo_peek(stream, out, sid);
} else {
mid = lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG ?
sctp_mid_next(stream, out, sid) :
sctp_mid_peek(stream, out, sid);
}
hdr->mid = htonl(mid);
}
}
@ -449,9 +453,6 @@ static struct sctp_ulpevent *sctp_intl_order(struct sctp_ulpq *ulpq,
struct sctp_stream *stream;
__u16 sid;
if (event->msg_flags & SCTP_DATA_UNORDERED)
return event;
stream = &ulpq->asoc->stream;
sid = event->stream;
@ -512,6 +513,317 @@ out_free:
return 0;
}
static void sctp_intl_store_reasm_uo(struct sctp_ulpq *ulpq,
struct sctp_ulpevent *event)
{
struct sctp_ulpevent *cevent;
struct sk_buff *pos;
pos = skb_peek_tail(&ulpq->reasm_uo);
if (!pos) {
__skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event));
return;
}
cevent = sctp_skb2event(pos);
if (event->stream == cevent->stream &&
event->mid == cevent->mid &&
(cevent->msg_flags & SCTP_DATA_FIRST_FRAG ||
(!(event->msg_flags & SCTP_DATA_FIRST_FRAG) &&
event->fsn > cevent->fsn))) {
__skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event));
return;
}
if ((event->stream == cevent->stream &&
MID_lt(cevent->mid, event->mid)) ||
event->stream > cevent->stream) {
__skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event));
return;
}
skb_queue_walk(&ulpq->reasm_uo, pos) {
cevent = sctp_skb2event(pos);
if (event->stream < cevent->stream ||
(event->stream == cevent->stream &&
MID_lt(event->mid, cevent->mid)))
break;
if (event->stream == cevent->stream &&
event->mid == cevent->mid &&
!(cevent->msg_flags & SCTP_DATA_FIRST_FRAG) &&
(event->msg_flags & SCTP_DATA_FIRST_FRAG ||
event->fsn < cevent->fsn))
break;
}
__skb_queue_before(&ulpq->reasm_uo, pos, sctp_event2skb(event));
}
static struct sctp_ulpevent *sctp_intl_retrieve_partial_uo(
struct sctp_ulpq *ulpq,
struct sctp_ulpevent *event)
{
struct sk_buff *first_frag = NULL;
struct sk_buff *last_frag = NULL;
struct sctp_ulpevent *retval;
struct sctp_stream_in *sin;
struct sk_buff *pos;
__u32 next_fsn = 0;
int is_last = 0;
sin = sctp_stream_in(ulpq->asoc, event->stream);
skb_queue_walk(&ulpq->reasm_uo, pos) {
struct sctp_ulpevent *cevent = sctp_skb2event(pos);
if (cevent->stream < event->stream)
continue;
if (cevent->stream > event->stream)
break;
if (MID_lt(cevent->mid, sin->mid_uo))
continue;
if (MID_lt(sin->mid_uo, cevent->mid))
break;
switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
case SCTP_DATA_FIRST_FRAG:
goto out;
case SCTP_DATA_MIDDLE_FRAG:
if (!first_frag) {
if (cevent->fsn == sin->fsn_uo) {
first_frag = pos;
last_frag = pos;
next_fsn = cevent->fsn + 1;
}
} else if (cevent->fsn == next_fsn) {
last_frag = pos;
next_fsn++;
} else {
goto out;
}
break;
case SCTP_DATA_LAST_FRAG:
if (!first_frag) {
if (cevent->fsn == sin->fsn_uo) {
first_frag = pos;
last_frag = pos;
next_fsn = 0;
is_last = 1;
}
} else if (cevent->fsn == next_fsn) {
last_frag = pos;
next_fsn = 0;
is_last = 1;
}
goto out;
default:
goto out;
}
}
out:
if (!first_frag)
return NULL;
retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
&ulpq->reasm_uo, first_frag,
last_frag);
if (retval) {
sin->fsn_uo = next_fsn;
if (is_last) {
retval->msg_flags |= MSG_EOR;
sin->pd_mode_uo = 0;
}
}
return retval;
}
static struct sctp_ulpevent *sctp_intl_retrieve_reassembled_uo(
struct sctp_ulpq *ulpq,
struct sctp_ulpevent *event)
{
struct sctp_association *asoc = ulpq->asoc;
struct sk_buff *pos, *first_frag = NULL;
struct sctp_ulpevent *retval = NULL;
struct sk_buff *pd_first = NULL;
struct sk_buff *pd_last = NULL;
struct sctp_stream_in *sin;
__u32 next_fsn = 0;
__u32 pd_point = 0;
__u32 pd_len = 0;
__u32 mid = 0;
sin = sctp_stream_in(ulpq->asoc, event->stream);
skb_queue_walk(&ulpq->reasm_uo, pos) {
struct sctp_ulpevent *cevent = sctp_skb2event(pos);
if (cevent->stream < event->stream)
continue;
if (cevent->stream > event->stream)
break;
if (MID_lt(cevent->mid, event->mid))
continue;
if (MID_lt(event->mid, cevent->mid))
break;
switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
case SCTP_DATA_FIRST_FRAG:
if (!sin->pd_mode_uo) {
sin->mid_uo = cevent->mid;
pd_first = pos;
pd_last = pos;
pd_len = pos->len;
}
first_frag = pos;
next_fsn = 0;
mid = cevent->mid;
break;
case SCTP_DATA_MIDDLE_FRAG:
if (first_frag && cevent->mid == mid &&
cevent->fsn == next_fsn) {
next_fsn++;
if (pd_first) {
pd_last = pos;
pd_len += pos->len;
}
} else {
first_frag = NULL;
}
break;
case SCTP_DATA_LAST_FRAG:
if (first_frag && cevent->mid == mid &&
cevent->fsn == next_fsn)
goto found;
else
first_frag = NULL;
break;
}
}
if (!pd_first)
goto out;
pd_point = sctp_sk(asoc->base.sk)->pd_point;
if (pd_point && pd_point <= pd_len) {
retval = sctp_make_reassembled_event(sock_net(asoc->base.sk),
&ulpq->reasm_uo,
pd_first, pd_last);
if (retval) {
sin->fsn_uo = next_fsn;
sin->pd_mode_uo = 1;
}
}
goto out;
found:
retval = sctp_make_reassembled_event(sock_net(asoc->base.sk),
&ulpq->reasm_uo,
first_frag, pos);
if (retval)
retval->msg_flags |= MSG_EOR;
out:
return retval;
}
static struct sctp_ulpevent *sctp_intl_reasm_uo(struct sctp_ulpq *ulpq,
struct sctp_ulpevent *event)
{
struct sctp_ulpevent *retval = NULL;
struct sctp_stream_in *sin;
if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) {
event->msg_flags |= MSG_EOR;
return event;
}
sctp_intl_store_reasm_uo(ulpq, event);
sin = sctp_stream_in(ulpq->asoc, event->stream);
if (sin->pd_mode_uo && event->mid == sin->mid_uo &&
event->fsn == sin->fsn_uo)
retval = sctp_intl_retrieve_partial_uo(ulpq, event);
if (!retval)
retval = sctp_intl_retrieve_reassembled_uo(ulpq, event);
return retval;
}
static struct sctp_ulpevent *sctp_intl_retrieve_first_uo(struct sctp_ulpq *ulpq)
{
struct sctp_stream_in *csin, *sin = NULL;
struct sk_buff *first_frag = NULL;
struct sk_buff *last_frag = NULL;
struct sctp_ulpevent *retval;
struct sk_buff *pos;
__u32 next_fsn = 0;
__u16 sid = 0;
skb_queue_walk(&ulpq->reasm_uo, pos) {
struct sctp_ulpevent *cevent = sctp_skb2event(pos);
csin = sctp_stream_in(ulpq->asoc, cevent->stream);
if (csin->pd_mode_uo)
continue;
switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
case SCTP_DATA_FIRST_FRAG:
if (first_frag)
goto out;
first_frag = pos;
last_frag = pos;
next_fsn = 0;
sin = csin;
sid = cevent->stream;
sin->mid_uo = cevent->mid;
break;
case SCTP_DATA_MIDDLE_FRAG:
if (!first_frag)
break;
if (cevent->stream == sid &&
cevent->mid == sin->mid_uo &&
cevent->fsn == next_fsn) {
next_fsn++;
last_frag = pos;
} else {
goto out;
}
break;
case SCTP_DATA_LAST_FRAG:
if (first_frag)
goto out;
break;
default:
break;
}
}
if (!first_frag)
return NULL;
out:
retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
&ulpq->reasm_uo, first_frag,
last_frag);
if (retval) {
sin->fsn_uo = next_fsn;
sin->pd_mode_uo = 1;
}
return retval;
}
static int sctp_ulpevent_idata(struct sctp_ulpq *ulpq,
struct sctp_chunk *chunk, gfp_t gfp)
{
@ -529,12 +841,16 @@ static int sctp_ulpevent_idata(struct sctp_ulpq *ulpq,
else
event->fsn = ntohl(chunk->subh.idata_hdr->fsn);
event = sctp_intl_reasm(ulpq, event);
if (event && event->msg_flags & MSG_EOR) {
skb_queue_head_init(&temp);
__skb_queue_tail(&temp, sctp_event2skb(event));
if (!(event->msg_flags & SCTP_DATA_UNORDERED)) {
event = sctp_intl_reasm(ulpq, event);
if (event && event->msg_flags & MSG_EOR) {
skb_queue_head_init(&temp);
__skb_queue_tail(&temp, sctp_event2skb(event));
event = sctp_intl_order(ulpq, event);
event = sctp_intl_order(ulpq, event);
}
} else {
event = sctp_intl_reasm_uo(ulpq, event);
}
if (event) {
@ -614,14 +930,21 @@ static void sctp_intl_start_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
{
struct sctp_ulpevent *event;
if (skb_queue_empty(&ulpq->reasm))
return;
if (!skb_queue_empty(&ulpq->reasm)) {
do {
event = sctp_intl_retrieve_first(ulpq);
if (event)
sctp_enqueue_event(ulpq, event);
} while (event);
}
do {
event = sctp_intl_retrieve_first(ulpq);
if (event)
sctp_enqueue_event(ulpq, event);
} while (event);
if (!skb_queue_empty(&ulpq->reasm_uo)) {
do {
event = sctp_intl_retrieve_first_uo(ulpq);
if (event)
sctp_enqueue_event(ulpq, event);
} while (event);
}
}
static void sctp_renege_events(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
@ -643,6 +966,9 @@ static void sctp_renege_events(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
if (freed < needed)
freed += sctp_ulpq_renege_list(ulpq, &ulpq->reasm,
needed);
if (freed < needed)
freed += sctp_ulpq_renege_list(ulpq, &ulpq->reasm_uo,
needed);
}
if (chunk && freed >= needed)
@ -734,6 +1060,13 @@ static void sctp_intl_abort_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
struct sctp_stream_in *sin = &stream->in[sid];
__u32 mid;
if (sin->pd_mode_uo) {
sin->pd_mode_uo = 0;
mid = sin->mid_uo;
sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x1, gfp);
}
if (sin->pd_mode) {
sin->pd_mode = 0;

5
net/sctp/ulpqueue.c
View File

@ -60,6 +60,7 @@ struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *ulpq,
ulpq->asoc = asoc;
skb_queue_head_init(&ulpq->reasm);
skb_queue_head_init(&ulpq->reasm_uo);
skb_queue_head_init(&ulpq->lobby);
ulpq->pd_mode = 0;
@ -83,6 +84,10 @@ void sctp_ulpq_flush(struct sctp_ulpq *ulpq)
sctp_ulpevent_free(event);
}
while ((skb = __skb_dequeue(&ulpq->reasm_uo)) != NULL) {
event = sctp_skb2event(skb);
sctp_ulpevent_free(event);
}
}
/* Dispose of a ulpqueue. */