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sctp: add sctp_info dump api for sctp_diag

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sctp_diag will dump some important details of sctp's assoc or ep, we use
sctp_info to describe them,  sctp_get_sctp_info to get them, and export
it to sctp_diag.ko.

v2->v3:
- we will not use list_for_each_safe in sctp_get_sctp_info, cause
  all the callers of it will use lock_sock.

- fix the holes in struct sctp_info with __reserved* field.
  because sctp_diag is a new feature, and sctp_info is just for now,
  it may be changed in the future.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2016-04-14 15:35:30 +08:00 • committed by David S. Miller
parent 311b21774f
commit 52c52a61a3
3 changed files with 156 additions and 0 deletions
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86
net/sctp/socket.c
View file

@ -4202,6 +4202,92 @@ static void sctp_shutdown(struct sock *sk, int how)
}
}
int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
struct sctp_info *info)
{
struct sctp_transport *prim;
struct list_head *pos;
int mask;
memset(info, 0, sizeof(*info));
if (!asoc) {
struct sctp_sock *sp = sctp_sk(sk);
info->sctpi_s_autoclose = sp->autoclose;
info->sctpi_s_adaptation_ind = sp->adaptation_ind;
info->sctpi_s_pd_point = sp->pd_point;
info->sctpi_s_nodelay = sp->nodelay;
info->sctpi_s_disable_fragments = sp->disable_fragments;
info->sctpi_s_v4mapped = sp->v4mapped;
info->sctpi_s_frag_interleave = sp->frag_interleave;
return 0;
}
info->sctpi_tag = asoc->c.my_vtag;
info->sctpi_state = asoc->state;
info->sctpi_rwnd = asoc->a_rwnd;
info->sctpi_unackdata = asoc->unack_data;
info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
info->sctpi_instrms = asoc->c.sinit_max_instreams;
info->sctpi_outstrms = asoc->c.sinit_num_ostreams;
list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
info->sctpi_inqueue++;
list_for_each(pos, &asoc->outqueue.out_chunk_list)
info->sctpi_outqueue++;
info->sctpi_overall_error = asoc->overall_error_count;
info->sctpi_max_burst = asoc->max_burst;
info->sctpi_maxseg = asoc->frag_point;
info->sctpi_peer_rwnd = asoc->peer.rwnd;
info->sctpi_peer_tag = asoc->c.peer_vtag;
mask = asoc->peer.ecn_capable << 1;
mask = (mask | asoc->peer.ipv4_address) << 1;
mask = (mask | asoc->peer.ipv6_address) << 1;
mask = (mask | asoc->peer.hostname_address) << 1;
mask = (mask | asoc->peer.asconf_capable) << 1;
mask = (mask | asoc->peer.prsctp_capable) << 1;
mask = (mask | asoc->peer.auth_capable);
info->sctpi_peer_capable = mask;
mask = asoc->peer.sack_needed << 1;
mask = (mask | asoc->peer.sack_generation) << 1;
mask = (mask | asoc->peer.zero_window_announced);
info->sctpi_peer_sack = mask;
info->sctpi_isacks = asoc->stats.isacks;
info->sctpi_osacks = asoc->stats.osacks;
info->sctpi_opackets = asoc->stats.opackets;
info->sctpi_ipackets = asoc->stats.ipackets;
info->sctpi_rtxchunks = asoc->stats.rtxchunks;
info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
info->sctpi_idupchunks = asoc->stats.idupchunks;
info->sctpi_gapcnt = asoc->stats.gapcnt;
info->sctpi_ouodchunks = asoc->stats.ouodchunks;
info->sctpi_iuodchunks = asoc->stats.iuodchunks;
info->sctpi_oodchunks = asoc->stats.oodchunks;
info->sctpi_iodchunks = asoc->stats.iodchunks;
info->sctpi_octrlchunks = asoc->stats.octrlchunks;
info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
prim = asoc->peer.primary_path;
memcpy(&info->sctpi_p_address, &prim->ipaddr,
sizeof(struct sockaddr_storage));
info->sctpi_p_state = prim->state;
info->sctpi_p_cwnd = prim->cwnd;
info->sctpi_p_srtt = prim->srtt;
info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
info->sctpi_p_hbinterval = prim->hbinterval;
info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
info->sctpi_p_ssthresh = prim->ssthresh;
info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
info->sctpi_p_flight_size = prim->flight_size;
info->sctpi_p_error = prim->error_count;
return 0;
}
EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
/* 7.2.1 Association Status (SCTP_STATUS)
* Applications can retrieve current status information about an