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sctp: introduce sctp_assoc_update_frag_point

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and avoid the open-coded versions of it.

Now sctp_datamsg_from_user can just re-use asoc->frag_point as it will
always be updated.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner 2018-04-26 16:58:55 -03:00 committed by David S. Miller
parent feddd6c1af
commit 2f5e3c9df6
5 changed files with 20 additions and 39 deletions
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20
include/net/sctp/sctp.h
View File

@ -428,26 +428,6 @@ static inline int sctp_list_single_entry(struct list_head *head)
return (head->next != head) && (head->next == head->prev);
}
/* Break down data chunks at this point. */
static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
{
struct sctp_sock *sp = sctp_sk(asoc->base.sk);
struct sctp_af *af = sp->pf->af;
int frag = pmtu;
frag -= af->ip_options_len(asoc->base.sk);
frag -= af->net_header_len;
frag -= sizeof(struct sctphdr) + sctp_datachk_len(&asoc->stream);
if (asoc->user_frag)
frag = min_t(int, frag, asoc->user_frag);
frag = SCTP_TRUNC4(min_t(int, frag, SCTP_MAX_CHUNK_LEN -
sctp_datachk_len(&asoc->stream)));
return frag;
}
static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc)
{
sctp_assoc_sync_pmtu(asoc);

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

@ -2097,6 +2097,7 @@ int sctp_assoc_update(struct sctp_association *old,
__u32 sctp_association_get_next_tsn(struct sctp_association *);
void sctp_assoc_update_frag_point(struct sctp_association *asoc);
void sctp_assoc_set_pmtu(struct sctp_association *asoc, __u32 pmtu);
void sctp_assoc_sync_pmtu(struct sctp_association *asoc);
void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int);

24
net/sctp/associola.c
View File

@ -666,8 +666,6 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
peer->pmtu_pending = 0;
asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
/* The asoc->peer.port might not be meaningful yet, but
* initialize the packet structure anyway.
*/
@ -1370,10 +1368,26 @@ sctp_assoc_choose_alter_transport(struct sctp_association *asoc,
}
}
void sctp_assoc_update_frag_point(struct sctp_association *asoc)
{
int frag = sctp_mtu_payload(sctp_sk(asoc->base.sk), asoc->pathmtu,
sctp_datachk_len(&asoc->stream));
if (asoc->user_frag)
frag = min_t(int, frag, asoc->user_frag);
frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN -
sctp_datachk_len(&asoc->stream));
asoc->frag_point = SCTP_TRUNC4(frag);
}
void sctp_assoc_set_pmtu(struct sctp_association *asoc, __u32 pmtu)
{
if (asoc->pathmtu != pmtu)
if (asoc->pathmtu != pmtu) {
asoc->pathmtu = pmtu;
sctp_assoc_update_frag_point(asoc);
}
pr_debug("%s: asoc:%p, pmtu:%d, frag_point:%d\n", __func__, asoc,
asoc->pathmtu, asoc->frag_point);
@ -1403,10 +1417,6 @@ void sctp_assoc_sync_pmtu(struct sctp_association *asoc)
}
sctp_assoc_set_pmtu(asoc, pmtu);
asoc->frag_point = sctp_frag_point(asoc, pmtu);
pr_debug("%s: asoc:%p, pmtu:%d, frag_point:%d\n", __func__, asoc,
asoc->pathmtu, asoc->frag_point);
}
/* Should we send a SACK to update our peer? */

12
net/sctp/chunk.c
View File

@ -172,8 +172,6 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
struct list_head *pos, *temp;
struct sctp_chunk *chunk;
struct sctp_datamsg *msg;
struct sctp_sock *sp;
struct sctp_af *af;
int err;
msg = sctp_datamsg_new(GFP_KERNEL);
@ -192,12 +190,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
/* This is the biggest possible DATA chunk that can fit into
* the packet
*/
sp = sctp_sk(asoc->base.sk);
af = sp->pf->af;
max_data = asoc->pathmtu - af->net_header_len -
sizeof(struct sctphdr) - sctp_datachk_len(&asoc->stream) -
af->ip_options_len(asoc->base.sk);
max_data = SCTP_TRUNC4(max_data);
max_data = asoc->frag_point;
/* If the the peer requested that we authenticate DATA chunks
* we need to account for bundling of the AUTH chunks along with
@ -222,9 +215,6 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
}
}
/* Check what's our max considering the above */
max_data = min_t(size_t, max_data, asoc->frag_point);
/* Set first_len and then account for possible bundles on first frag */
first_len = max_data;

2
net/sctp/socket.c
View File

@ -3251,7 +3251,7 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned
sctp_datachk_len(&asoc->stream);
}
asoc->user_frag = val;
asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
sctp_assoc_update_frag_point(asoc);
} else {
if (params.assoc_id && sctp_style(sk, UDP))
return -EINVAL;