On Tue, Nov 26, 2019 at 10:09 PM Neil Horman <nhorman@xxxxxxxxxxxxx> wrote:
>
> On Tue, Nov 26, 2019 at 04:27:20PM +0800, Xin Long wrote:
> > On Mon, Nov 25, 2019 at 9:24 PM Neil Horman <nhorman@xxxxxxxxxxxxx> wrote:
> > >
> > > On Mon, Nov 25, 2019 at 11:59:50AM +0800, Xin Long wrote:
> > > > Commit 312434617cb1 ("sctp: cache netns in sctp_ep_common") set netns
> > > > in asoc and ep base since they're created, and it will never change.
> > > > It's a better way to get netns from asoc and ep base, comparing to
> > > > calling sock_net().
> > > >
> > > > This patch is to replace them.
> > > >
> > > I don't see anything expressly wrong with this, but I'm not sure I see it as
> > > better either. It makes things more consistent with commit 312434617cb1, sure,
> > > but both sock_net, and its called read_pnet are both static inline functions, so
> > > it should reduce to the same thing.
> > >
> > > In fact, I think it may be better to ammend the fix from 312434617cb1, to,
> > > instead of caching the net structure in the ep_common struct, instead, update
> > > sctp_assoc_migrate so that the new value base.sk is atomically exchanged before
> > > any calls to sock_put/sock_hold are made, so that the rhashtable lookup is
> > > consistent. That would allow us to consistently use sock_net the way other
> > > protocols do
> > why is "before any calls to sock_put/sock_hold are made"?
> >
> It was my understanding that the problem in commit 312434617cb1 was that the
> rhashtable lookup that ended in sctp_hash_obj was running in parallel with
> sctp_assoc_migrate, and the result was that the socket pointer in the hash table
> was getting freed on a sock_put while it was being accessed by the
> rehash_operation
>
> But as I look closer, thats not actually whats happening (I don't think), it
> appears that KCSAN is just reporting that a read and write operation is
> happening in parallel between the two, which could potentially lead to a
> corruption.
I think so, that's why we need memory barriers to eliminate this warning.
>
>
> > I was thinking to use rcu_assign_pointer() and rcu_dereference() for base.sk,
> > but looks troublesome to replace all places.
> > do you think it would work for atomic exchange? or you have some better idea?
> >
> I'm not sure. I get that rcu is going to be cumbersome here, since
> sctp_assoc_migrate is the only location we seem to be writing the value of
> base.sk while its present in the hash table, and we don't want to annotate all
> the other read sites with rcu tags. However, we don't really want to use
> cmpxchg either, since we just want to read it on one side and write it in the
> other.
right.
>
> It seems, like given the rhashtable api, the expectation is that, for a given
> element in the hashtable, if that element changes, we would want to replace the
> element with a new copy using rhashtable_replace_fast, which follows all the
> internal locking protocols of the hashtable and allows for a quick update
> safely, but we don't really want to do that, we just want to replace a field in
> a structure thats pointed to by the transport structs which are whats really in
> the hash table.
Exactly, we don't even really need transport->asoc.base.sk, as you know,
what we care is transport->asoc.base.net, which would never change once
created.
>
> I wonder if there isn't a need here for an addition to the rhashtable api.
> Something like rhashtable_lock(struct rhashtable *ht) and
> rhashtable_unlock(struct rhashtable *ht), which respectively would just lock and
> unlock the ht->mutex. Since the rht_deferred_worker isn't exposed in any way
> via the api, it seems like there is no way to really know when its safe to
> update those pointers, because we never know if the rhashtable workers are
> running in parallel with us. If we had api access to the ht->mutex, we could
> block the forward progress of any async workers in the hash table, which would
> allow us to safely update any member pointers. And then we wouldn't need to
> cache the net struct.
That would work, but:
1. ht->mutex is used to protect hashtable itself, and acquired only when
hashtable size is changing, NOT even when inserting elements. It does
not sound good to protect t->asoc->base.sk changing.
2. As the node in rhashtbable, transport's keys should be kept invariable
after created, including t->asoc->base.bind_addr.port, t->ipaddr, and
t->asoc->base.sk->net. t->asoc->base.sk is not invariable, but netns
is, all we should do it to have a proper way to get netns, like:
t->asoc->base.net.
3. caching netns looks clearer and easier than using ht->mutex in sctp.
>
> What do you think?
>
> Neil
>
> >
> > >
> > > Neil
> > >
> > > > Suggested-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
> > > > Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
> > > > ---
> > > > net/sctp/associola.c | 10 +++++-----
> > > > net/sctp/chunk.c | 2 +-
> > > > net/sctp/endpointola.c | 6 +++---
> > > > net/sctp/input.c | 5 ++---
> > > > net/sctp/output.c | 2 +-
> > > > net/sctp/outqueue.c | 6 +++---
> > > > net/sctp/sm_make_chunk.c | 7 +++----
> > > > net/sctp/sm_sideeffect.c | 16 ++++++----------
> > > > net/sctp/sm_statefuns.c | 2 +-
> > > > net/sctp/socket.c | 12 +++++-------
> > > > net/sctp/stream.c | 3 +--
> > > > net/sctp/stream_interleave.c | 23 ++++++++++-------------
> > > > net/sctp/transport.c | 2 +-
> > > > net/sctp/ulpqueue.c | 15 +++++++--------
> > > > 14 files changed, 49 insertions(+), 62 deletions(-)
> > > >
> > > > diff --git a/net/sctp/associola.c b/net/sctp/associola.c
> > > > index 41839b8..a725f53 100644
> > > > --- a/net/sctp/associola.c
> > > > +++ b/net/sctp/associola.c
> > > > @@ -579,7 +579,6 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
> > > > const gfp_t gfp,
> > > > const int peer_state)
> > > > {
> > > > - struct net *net = sock_net(asoc->base.sk);
> > > > struct sctp_transport *peer;
> > > > struct sctp_sock *sp;
> > > > unsigned short port;
> > > > @@ -609,7 +608,7 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
> > > > return peer;
> > > > }
> > > >
> > > > - peer = sctp_transport_new(net, addr, gfp);
> > > > + peer = sctp_transport_new(asoc->base.net, addr, gfp);
> > > > if (!peer)
> > > > return NULL;
> > > >
> > > > @@ -978,7 +977,7 @@ static void sctp_assoc_bh_rcv(struct work_struct *work)
> > > > struct sctp_association *asoc =
> > > > container_of(work, struct sctp_association,
> > > > base.inqueue.immediate);
> > > > - struct net *net = sock_net(asoc->base.sk);
> > > > + struct net *net = asoc->base.net;
> > > > union sctp_subtype subtype;
> > > > struct sctp_endpoint *ep;
> > > > struct sctp_chunk *chunk;
> > > > @@ -1446,7 +1445,8 @@ void sctp_assoc_sync_pmtu(struct sctp_association *asoc)
> > > > /* Should we send a SACK to update our peer? */
> > > > static inline bool sctp_peer_needs_update(struct sctp_association *asoc)
> > > > {
> > > > - struct net *net = sock_net(asoc->base.sk);
> > > > + struct net *net = asoc->base.net;
> > > > +
> > > > switch (asoc->state) {
> > > > case SCTP_STATE_ESTABLISHED:
> > > > case SCTP_STATE_SHUTDOWN_PENDING:
> > > > @@ -1580,7 +1580,7 @@ int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc,
> > > > if (asoc->peer.ipv6_address)
> > > > flags |= SCTP_ADDR6_PEERSUPP;
> > > >
> > > > - return sctp_bind_addr_copy(sock_net(asoc->base.sk),
> > > > + return sctp_bind_addr_copy(asoc->base.net,
> > > > &asoc->base.bind_addr,
> > > > &asoc->ep->base.bind_addr,
> > > > scope, gfp, flags);
> > > > diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
> > > > index cc0405c..064675b 100644
> > > > --- a/net/sctp/chunk.c
> > > > +++ b/net/sctp/chunk.c
> > > > @@ -227,7 +227,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
> > > > if (msg_len >= first_len) {
> > > > msg->can_delay = 0;
> > > > if (msg_len > first_len)
> > > > - SCTP_INC_STATS(sock_net(asoc->base.sk),
> > > > + SCTP_INC_STATS(asoc->base.net,
> > > > SCTP_MIB_FRAGUSRMSGS);
> > > > } else {
> > > > /* Which may be the only one... */
> > > > diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
> > > > index 3067deb..6e7e0d3 100644
> > > > --- a/net/sctp/endpointola.c
> > > > +++ b/net/sctp/endpointola.c
> > > > @@ -244,7 +244,7 @@ struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
> > > > struct sctp_endpoint *retval = NULL;
> > > >
> > > > if ((htons(ep->base.bind_addr.port) == laddr->v4.sin_port) &&
> > > > - net_eq(sock_net(ep->base.sk), net)) {
> > > > + net_eq(ep->base.net, net)) {
> > > > if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
> > > > sctp_sk(ep->base.sk)))
> > > > retval = ep;
> > > > @@ -292,8 +292,8 @@ bool sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
> > > > const union sctp_addr *paddr)
> > > > {
> > > > struct sctp_sockaddr_entry *addr;
> > > > + struct net *net = ep->base.net;
> > > > struct sctp_bind_addr *bp;
> > > > - struct net *net = sock_net(ep->base.sk);
> > > >
> > > > bp = &ep->base.bind_addr;
> > > > /* This function is called with the socket lock held,
> > > > @@ -384,7 +384,7 @@ static void sctp_endpoint_bh_rcv(struct work_struct *work)
> > > > if (asoc && sctp_chunk_is_data(chunk))
> > > > asoc->peer.last_data_from = chunk->transport;
> > > > else {
> > > > - SCTP_INC_STATS(sock_net(ep->base.sk), SCTP_MIB_INCTRLCHUNKS);
> > > > + SCTP_INC_STATS(ep->base.net, SCTP_MIB_INCTRLCHUNKS);
> > > > if (asoc)
> > > > asoc->stats.ictrlchunks++;
> > > > }
> > > > diff --git a/net/sctp/input.c b/net/sctp/input.c
> > > > index 4d2bcfc..efaaefc 100644
> > > > --- a/net/sctp/input.c
> > > > +++ b/net/sctp/input.c
> > > > @@ -937,7 +937,7 @@ int sctp_hash_transport(struct sctp_transport *t)
> > > > if (t->asoc->temp)
> > > > return 0;
> > > >
> > > > - arg.net = sock_net(t->asoc->base.sk);
> > > > + arg.net = t->asoc->base.net;
> > > > arg.paddr = &t->ipaddr;
> > > > arg.lport = htons(t->asoc->base.bind_addr.port);
> > > >
> > > > @@ -1004,12 +1004,11 @@ struct sctp_transport *sctp_epaddr_lookup_transport(
> > > > const struct sctp_endpoint *ep,
> > > > const union sctp_addr *paddr)
> > > > {
> > > > - struct net *net = sock_net(ep->base.sk);
> > > > struct rhlist_head *tmp, *list;
> > > > struct sctp_transport *t;
> > > > struct sctp_hash_cmp_arg arg = {
> > > > .paddr = paddr,
> > > > - .net = net,
> > > > + .net = ep->base.net,
> > > > .lport = htons(ep->base.bind_addr.port),
> > > > };
> > > >
> > > > diff --git a/net/sctp/output.c b/net/sctp/output.c
> > > > index dbda7e7..1441eaf 100644
> > > > --- a/net/sctp/output.c
> > > > +++ b/net/sctp/output.c
> > > > @@ -282,7 +282,7 @@ static enum sctp_xmit sctp_packet_bundle_sack(struct sctp_packet *pkt,
> > > > sctp_chunk_free(sack);
> > > > goto out;
> > > > }
> > > > - SCTP_INC_STATS(sock_net(asoc->base.sk),
> > > > + SCTP_INC_STATS(asoc->base.net,
> > > > SCTP_MIB_OUTCTRLCHUNKS);
> > > > asoc->stats.octrlchunks++;
> > > > asoc->peer.sack_needed = 0;
> > > > diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
> > > > index 0dab62b..a031d11 100644
> > > > --- a/net/sctp/outqueue.c
> > > > +++ b/net/sctp/outqueue.c
> > > > @@ -279,7 +279,7 @@ void sctp_outq_free(struct sctp_outq *q)
> > > > /* Put a new chunk in an sctp_outq. */
> > > > void sctp_outq_tail(struct sctp_outq *q, struct sctp_chunk *chunk, gfp_t gfp)
> > > > {
> > > > - struct net *net = sock_net(q->asoc->base.sk);
> > > > + struct net *net = q->asoc->base.net;
> > > >
> > > > pr_debug("%s: outq:%p, chunk:%p[%s]\n", __func__, q, chunk,
> > > > chunk && chunk->chunk_hdr ?
> > > > @@ -533,7 +533,7 @@ void sctp_retransmit_mark(struct sctp_outq *q,
> > > > void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport,
> > > > enum sctp_retransmit_reason reason)
> > > > {
> > > > - struct net *net = sock_net(q->asoc->base.sk);
> > > > + struct net *net = q->asoc->base.net;
> > > >
> > > > switch (reason) {
> > > > case SCTP_RTXR_T3_RTX:
> > > > @@ -1884,6 +1884,6 @@ void sctp_generate_fwdtsn(struct sctp_outq *q, __u32 ctsn)
> > > >
> > > > if (ftsn_chunk) {
> > > > list_add_tail(&ftsn_chunk->list, &q->control_chunk_list);
> > > > - SCTP_INC_STATS(sock_net(asoc->base.sk), SCTP_MIB_OUTCTRLCHUNKS);
> > > > + SCTP_INC_STATS(asoc->base.net, SCTP_MIB_OUTCTRLCHUNKS);
> > > > }
> > > > }
> > > > diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> > > > index 48d6395..09050c1 100644
> > > > --- a/net/sctp/sm_make_chunk.c
> > > > +++ b/net/sctp/sm_make_chunk.c
> > > > @@ -2307,7 +2307,6 @@ int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
> > > > const union sctp_addr *peer_addr,
> > > > struct sctp_init_chunk *peer_init, gfp_t gfp)
> > > > {
> > > > - struct net *net = sock_net(asoc->base.sk);
> > > > struct sctp_transport *transport;
> > > > struct list_head *pos, *temp;
> > > > union sctp_params param;
> > > > @@ -2363,8 +2362,8 @@ int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
> > > > * also give us an option to silently ignore the packet, which
> > > > * is what we'll do here.
> > > > */
> > > > - if (!net->sctp.addip_noauth &&
> > > > - (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
> > > > + if (!asoc->base.net->sctp.addip_noauth &&
> > > > + (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
> > > > asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
> > > > SCTP_PARAM_DEL_IP |
> > > > SCTP_PARAM_SET_PRIMARY);
> > > > @@ -2491,9 +2490,9 @@ static int sctp_process_param(struct sctp_association *asoc,
> > > > const union sctp_addr *peer_addr,
> > > > gfp_t gfp)
> > > > {
> > > > - struct net *net = sock_net(asoc->base.sk);
> > > > struct sctp_endpoint *ep = asoc->ep;
> > > > union sctp_addr_param *addr_param;
> > > > + struct net *net = asoc->base.net;
> > > > struct sctp_transport *t;
> > > > enum sctp_scope scope;
> > > > union sctp_addr addr;
> > > > diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
> > > > index e52b212..20b0281 100644
> > > > --- a/net/sctp/sm_sideeffect.c
> > > > +++ b/net/sctp/sm_sideeffect.c
> > > > @@ -516,8 +516,6 @@ static void sctp_do_8_2_transport_strike(struct sctp_cmd_seq *commands,
> > > > struct sctp_transport *transport,
> > > > int is_hb)
> > > > {
> > > > - struct net *net = sock_net(asoc->base.sk);
> > > > -
> > > > /* The check for association's overall error counter exceeding the
> > > > * threshold is done in the state function.
> > > > */
> > > > @@ -544,10 +542,10 @@ static void sctp_do_8_2_transport_strike(struct sctp_cmd_seq *commands,
> > > > * is SCTP_ACTIVE, then mark this transport as Partially Failed,
> > > > * see SCTP Quick Failover Draft, section 5.1
> > > > */
> > > > - if (net->sctp.pf_enable &&
> > > > - (transport->state == SCTP_ACTIVE) &&
> > > > - (transport->error_count < transport->pathmaxrxt) &&
> > > > - (transport->error_count > transport->pf_retrans)) {
> > > > + if (asoc->base.net->sctp.pf_enable &&
> > > > + transport->state == SCTP_ACTIVE &&
> > > > + transport->error_count < transport->pathmaxrxt &&
> > > > + transport->error_count > transport->pf_retrans) {
> > > >
> > > > sctp_assoc_control_transport(asoc, transport,
> > > > SCTP_TRANSPORT_PF,
> > > > @@ -793,10 +791,8 @@ static int sctp_cmd_process_sack(struct sctp_cmd_seq *cmds,
> > > > int err = 0;
> > > >
> > > > if (sctp_outq_sack(&asoc->outqueue, chunk)) {
> > > > - struct net *net = sock_net(asoc->base.sk);
> > > > -
> > > > /* There are no more TSNs awaiting SACK. */
> > > > - err = sctp_do_sm(net, SCTP_EVENT_T_OTHER,
> > > > + err = sctp_do_sm(asoc->base.net, SCTP_EVENT_T_OTHER,
> > > > SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
> > > > asoc->state, asoc->ep, asoc, NULL,
> > > > GFP_ATOMIC);
> > > > @@ -829,7 +825,7 @@ static void sctp_cmd_assoc_update(struct sctp_cmd_seq *cmds,
> > > > struct sctp_association *asoc,
> > > > struct sctp_association *new)
> > > > {
> > > > - struct net *net = sock_net(asoc->base.sk);
> > > > + struct net *net = asoc->base.net;
> > > > struct sctp_chunk *abort;
> > > >
> > > > if (!sctp_assoc_update(asoc, new))
> > > > diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> > > > index 4ab8208..42558fa 100644
> > > > --- a/net/sctp/sm_statefuns.c
> > > > +++ b/net/sctp/sm_statefuns.c
> > > > @@ -1320,7 +1320,7 @@ static int sctp_sf_check_restart_addrs(const struct sctp_association *new_asoc,
> > > > struct sctp_chunk *init,
> > > > struct sctp_cmd_seq *commands)
> > > > {
> > > > - struct net *net = sock_net(new_asoc->base.sk);
> > > > + struct net *net = new_asoc->base.net;
> > > > struct sctp_transport *new_addr;
> > > > int ret = 1;
> > > >
> > > > diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> > > > index ffd3262..5e0efbc 100644
> > > > --- a/net/sctp/socket.c
> > > > +++ b/net/sctp/socket.c
> > > > @@ -436,8 +436,7 @@ static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
> > > > static int sctp_send_asconf(struct sctp_association *asoc,
> > > > struct sctp_chunk *chunk)
> > > > {
> > > > - struct net *net = sock_net(asoc->base.sk);
> > > > - int retval = 0;
> > > > + int retval = 0;
> > > >
> > > > /* If there is an outstanding ASCONF chunk, queue it for later
> > > > * transmission.
> > > > @@ -449,7 +448,7 @@ static int sctp_send_asconf(struct sctp_association *asoc,
> > > >
> > > > /* Hold the chunk until an ASCONF_ACK is received. */
> > > > sctp_chunk_hold(chunk);
> > > > - retval = sctp_primitive_ASCONF(net, asoc, chunk);
> > > > + retval = sctp_primitive_ASCONF(asoc->base.net, asoc, chunk);
> > > > if (retval)
> > > > sctp_chunk_free(chunk);
> > > > else
> > > > @@ -2428,9 +2427,8 @@ static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
> > > > int error;
> > > >
> > > > if (params->spp_flags & SPP_HB_DEMAND && trans) {
> > > > - struct net *net = sock_net(trans->asoc->base.sk);
> > > > -
> > > > - error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
> > > > + error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
> > > > + trans->asoc, trans);
> > > > if (error)
> > > > return error;
> > > > }
> > > > @@ -5308,7 +5306,7 @@ struct sctp_transport *sctp_transport_get_next(struct net *net,
> > > > if (!sctp_transport_hold(t))
> > > > continue;
> > > >
> > > > - if (net_eq(sock_net(t->asoc->base.sk), net) &&
> > > > + if (net_eq(t->asoc->base.net, net) &&
> > > > t->asoc->peer.primary_path == t)
> > > > break;
> > > >
> > > > diff --git a/net/sctp/stream.c b/net/sctp/stream.c
> > > > index e83cdaa..df60b5e 100644
> > > > --- a/net/sctp/stream.c
> > > > +++ b/net/sctp/stream.c
> > > > @@ -218,10 +218,9 @@ void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
> > > > static int sctp_send_reconf(struct sctp_association *asoc,
> > > > struct sctp_chunk *chunk)
> > > > {
> > > > - struct net *net = sock_net(asoc->base.sk);
> > > > int retval = 0;
> > > >
> > > > - retval = sctp_primitive_RECONF(net, asoc, chunk);
> > > > + retval = sctp_primitive_RECONF(asoc->base.net, asoc, chunk);
> > > > if (retval)
> > > > sctp_chunk_free(chunk);
> > > >
> > > > diff --git a/net/sctp/stream_interleave.c b/net/sctp/stream_interleave.c
> > > > index 40c40be..6b13f73 100644
> > > > --- a/net/sctp/stream_interleave.c
> > > > +++ b/net/sctp/stream_interleave.c
> > > > @@ -241,9 +241,8 @@ static struct sctp_ulpevent *sctp_intl_retrieve_partial(
> > > > if (!first_frag)
> > > > return NULL;
> > > >
> > > > - retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
> > > > - &ulpq->reasm, first_frag,
> > > > - last_frag);
> > > > + retval = sctp_make_reassembled_event(ulpq->asoc->base.net, &ulpq->reasm,
> > > > + first_frag, last_frag);
> > > > if (retval) {
> > > > sin->fsn = next_fsn;
> > > > if (is_last) {
> > > > @@ -326,7 +325,7 @@ static struct sctp_ulpevent *sctp_intl_retrieve_reassembled(
> > > >
> > > > 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),
> > > > + retval = sctp_make_reassembled_event(asoc->base.net,
> > > > &ulpq->reasm,
> > > > pd_first, pd_last);
> > > > if (retval) {
> > > > @@ -337,8 +336,7 @@ static struct sctp_ulpevent *sctp_intl_retrieve_reassembled(
> > > > goto out;
> > > >
> > > > found:
> > > > - retval = sctp_make_reassembled_event(sock_net(asoc->base.sk),
> > > > - &ulpq->reasm,
> > > > + retval = sctp_make_reassembled_event(asoc->base.net, &ulpq->reasm,
> > > > first_frag, pos);
> > > > if (retval)
> > > > retval->msg_flags |= MSG_EOR;
> > > > @@ -630,7 +628,7 @@ static struct sctp_ulpevent *sctp_intl_retrieve_partial_uo(
> > > > if (!first_frag)
> > > > return NULL;
> > > >
> > > > - retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
> > > > + retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
> > > > &ulpq->reasm_uo, first_frag,
> > > > last_frag);
> > > > if (retval) {
> > > > @@ -716,7 +714,7 @@ static struct sctp_ulpevent *sctp_intl_retrieve_reassembled_uo(
> > > >
> > > > 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),
> > > > + retval = sctp_make_reassembled_event(asoc->base.net,
> > > > &ulpq->reasm_uo,
> > > > pd_first, pd_last);
> > > > if (retval) {
> > > > @@ -727,8 +725,7 @@ static struct sctp_ulpevent *sctp_intl_retrieve_reassembled_uo(
> > > > goto out;
> > > >
> > > > found:
> > > > - retval = sctp_make_reassembled_event(sock_net(asoc->base.sk),
> > > > - &ulpq->reasm_uo,
> > > > + retval = sctp_make_reassembled_event(asoc->base.net, &ulpq->reasm_uo,
> > > > first_frag, pos);
> > > > if (retval)
> > > > retval->msg_flags |= MSG_EOR;
> > > > @@ -814,7 +811,7 @@ static struct sctp_ulpevent *sctp_intl_retrieve_first_uo(struct sctp_ulpq *ulpq)
> > > > return NULL;
> > > >
> > > > out:
> > > > - retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
> > > > + retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
> > > > &ulpq->reasm_uo, first_frag,
> > > > last_frag);
> > > > if (retval) {
> > > > @@ -921,7 +918,7 @@ static struct sctp_ulpevent *sctp_intl_retrieve_first(struct sctp_ulpq *ulpq)
> > > > return NULL;
> > > >
> > > > out:
> > > > - retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
> > > > + retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
> > > > &ulpq->reasm, first_frag,
> > > > last_frag);
> > > > if (retval) {
> > > > @@ -1159,7 +1156,7 @@ static void sctp_generate_iftsn(struct sctp_outq *q, __u32 ctsn)
> > > >
> > > > if (ftsn_chunk) {
> > > > list_add_tail(&ftsn_chunk->list, &q->control_chunk_list);
> > > > - SCTP_INC_STATS(sock_net(asoc->base.sk), SCTP_MIB_OUTCTRLCHUNKS);
> > > > + SCTP_INC_STATS(asoc->base.net, SCTP_MIB_OUTCTRLCHUNKS);
> > > > }
> > > > }
> > > >
> > > > diff --git a/net/sctp/transport.c b/net/sctp/transport.c
> > > > index 7235a60..f4de064 100644
> > > > --- a/net/sctp/transport.c
> > > > +++ b/net/sctp/transport.c
> > > > @@ -334,7 +334,7 @@ void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
> > > > pr_debug("%s: rto_pending not set on transport %p!\n", __func__, tp);
> > > >
> > > > if (tp->rttvar || tp->srtt) {
> > > > - struct net *net = sock_net(tp->asoc->base.sk);
> > > > + struct net *net = tp->asoc->base.net;
> > > > /* 6.3.1 C3) When a new RTT measurement R' is made, set
> > > > * RTTVAR <- (1 - RTO.Beta) * RTTVAR + RTO.Beta * |SRTT - R'|
> > > > * SRTT <- (1 - RTO.Alpha) * SRTT + RTO.Alpha * R'
> > > > diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c
> > > > index b6536b7..1c6c640 100644
> > > > --- a/net/sctp/ulpqueue.c
> > > > +++ b/net/sctp/ulpqueue.c
> > > > @@ -486,10 +486,9 @@ static struct sctp_ulpevent *sctp_ulpq_retrieve_reassembled(struct sctp_ulpq *ul
> > > > cevent = sctp_skb2event(pd_first);
> > > > 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),
> > > > + retval = sctp_make_reassembled_event(asoc->base.net,
> > > > &ulpq->reasm,
> > > > - pd_first,
> > > > - pd_last);
> > > > + pd_first, pd_last);
> > > > if (retval)
> > > > sctp_ulpq_set_pd(ulpq);
> > > > }
> > > > @@ -497,7 +496,7 @@ static struct sctp_ulpevent *sctp_ulpq_retrieve_reassembled(struct sctp_ulpq *ul
> > > > done:
> > > > return retval;
> > > > found:
> > > > - retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
> > > > + retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
> > > > &ulpq->reasm, first_frag, pos);
> > > > if (retval)
> > > > retval->msg_flags |= MSG_EOR;
> > > > @@ -563,8 +562,8 @@ static struct sctp_ulpevent *sctp_ulpq_retrieve_partial(struct sctp_ulpq *ulpq)
> > > > * further.
> > > > */
> > > > done:
> > > > - retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
> > > > - &ulpq->reasm, first_frag, last_frag);
> > > > + retval = sctp_make_reassembled_event(ulpq->asoc->base.net, &ulpq->reasm,
> > > > + first_frag, last_frag);
> > > > if (retval && is_last)
> > > > retval->msg_flags |= MSG_EOR;
> > > >
> > > > @@ -664,8 +663,8 @@ static struct sctp_ulpevent *sctp_ulpq_retrieve_first(struct sctp_ulpq *ulpq)
> > > > * further.
> > > > */
> > > > done:
> > > > - retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
> > > > - &ulpq->reasm, first_frag, last_frag);
> > > > + retval = sctp_make_reassembled_event(ulpq->asoc->base.net, &ulpq->reasm,
> > > > + first_frag, last_frag);
> > > > return retval;
> > > > }
> > > >
> > > > --
> > > > 2.1.0
> > > >
> > > >
> >
