diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/sctp/associola.c | 120 |
1 files changed, 61 insertions, 59 deletions
diff --git a/net/sctp/associola.c b/net/sctp/associola.c index 39579c3e0d14..9f1cc6f1535d 100644 --- a/net/sctp/associola.c +++ b/net/sctp/associola.c @@ -55,6 +55,7 @@ #include <net/sctp/sm.h> /* Forward declarations for internal functions. */ +static void sctp_select_active_and_retran_path(struct sctp_association *asoc); static void sctp_assoc_bh_rcv(struct work_struct *work); static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc); static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc); @@ -774,9 +775,6 @@ void sctp_assoc_control_transport(struct sctp_association *asoc, sctp_transport_cmd_t command, sctp_sn_error_t error) { - struct sctp_transport *t = NULL; - struct sctp_transport *first; - struct sctp_transport *second; struct sctp_ulpevent *event; struct sockaddr_storage addr; int spc_state = 0; @@ -829,13 +827,14 @@ void sctp_assoc_control_transport(struct sctp_association *asoc, return; } - /* Generate and send a SCTP_PEER_ADDR_CHANGE notification to the - * user. + /* Generate and send a SCTP_PEER_ADDR_CHANGE notification + * to the user. */ if (ulp_notify) { memset(&addr, 0, sizeof(struct sockaddr_storage)); memcpy(&addr, &transport->ipaddr, transport->af_specific->sockaddr_len); + event = sctp_ulpevent_make_peer_addr_change(asoc, &addr, 0, spc_state, error, GFP_ATOMIC); if (event) @@ -843,60 +842,7 @@ void sctp_assoc_control_transport(struct sctp_association *asoc, } /* Select new active and retran paths. */ - - /* Look for the two most recently used active transports. - * - * This code produces the wrong ordering whenever jiffies - * rolls over, but we still get usable transports, so we don't - * worry about it. - */ - first = NULL; second = NULL; - - list_for_each_entry(t, &asoc->peer.transport_addr_list, - transports) { - - if ((t->state == SCTP_INACTIVE) || - (t->state == SCTP_UNCONFIRMED) || - (t->state == SCTP_PF)) - continue; - if (!first || t->last_time_heard > first->last_time_heard) { - second = first; - first = t; - } else if (!second || - t->last_time_heard > second->last_time_heard) - second = t; - } - - /* RFC 2960 6.4 Multi-Homed SCTP Endpoints - * - * By default, an endpoint should always transmit to the - * primary path, unless the SCTP user explicitly specifies the - * destination transport address (and possibly source - * transport address) to use. - * - * [If the primary is active but not most recent, bump the most - * recently used transport.] - */ - if (((asoc->peer.primary_path->state == SCTP_ACTIVE) || - (asoc->peer.primary_path->state == SCTP_UNKNOWN)) && - first != asoc->peer.primary_path) { - second = first; - first = asoc->peer.primary_path; - } - - if (!second) - second = first; - /* If we failed to find a usable transport, just camp on the - * primary, even if it is inactive. - */ - if (!first) { - first = asoc->peer.primary_path; - second = asoc->peer.primary_path; - } - - /* Set the active and retran transports. */ - asoc->peer.active_path = first; - asoc->peer.retran_path = second; + sctp_select_active_and_retran_path(asoc); } /* Hold a reference to an association. */ @@ -1325,6 +1271,62 @@ void sctp_assoc_update_retran_path(struct sctp_association *asoc) __func__, asoc, &asoc->peer.retran_path->ipaddr.sa); } +static void sctp_select_active_and_retran_path(struct sctp_association *asoc) +{ + struct sctp_transport *trans, *trans_pri = NULL, *trans_sec = NULL; + + /* Look for the two most recently used active transports. */ + list_for_each_entry(trans, &asoc->peer.transport_addr_list, + transports) { + if (trans->state == SCTP_INACTIVE || + trans->state == SCTP_UNCONFIRMED || + trans->state == SCTP_PF) + continue; + if (trans_pri == NULL || + trans->last_time_heard > trans_pri->last_time_heard) { + trans_sec = trans_pri; + trans_pri = trans; + } else if (trans_sec == NULL || + trans->last_time_heard > trans_sec->last_time_heard) { + trans_sec = trans; + } + } + + /* RFC 2960 6.4 Multi-Homed SCTP Endpoints + * + * By default, an endpoint should always transmit to the primary + * path, unless the SCTP user explicitly specifies the + * destination transport address (and possibly source transport + * address) to use. [If the primary is active but not most recent, + * bump the most recently used transport.] + */ + if ((asoc->peer.primary_path->state == SCTP_ACTIVE || + asoc->peer.primary_path->state == SCTP_UNKNOWN) && + asoc->peer.primary_path != trans_pri) { + trans_sec = trans_pri; + trans_pri = asoc->peer.primary_path; + } + + /* We did not find anything useful for a possible retransmission + * path; either primary path that we found is the the same as + * the current one, or we didn't generally find an active one. + */ + if (trans_sec == NULL) + trans_sec = trans_pri; + + /* If we failed to find a usable transport, just camp on the + * primary, even if they are inactive. + */ + if (trans_pri == NULL) { + trans_pri = asoc->peer.primary_path; + trans_sec = asoc->peer.primary_path; + } + + /* Set the active and retran transports. */ + asoc->peer.active_path = trans_pri; + asoc->peer.retran_path = trans_sec; +} + struct sctp_transport * sctp_assoc_choose_alter_transport(struct sctp_association *asoc, struct sctp_transport *last_sent_to) |