diff options
Diffstat (limited to 'net/tipc/link.c')
| -rw-r--r-- | net/tipc/link.c | 2031 |
1 files changed, 864 insertions, 1167 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c index eaa9fe54b4ae..75db07c78a69 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -48,9 +48,8 @@ /* * Error message prefixes */ -static const char *link_co_err = "Link changeover error, "; +static const char *link_co_err = "Link tunneling error, "; static const char *link_rst_msg = "Resetting link "; -static const char *link_unk_evt = "Unknown link event "; static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = { [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC }, @@ -77,256 +76,413 @@ static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { }; /* + * Interval between NACKs when packets arrive out of order + */ +#define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) +/* * Out-of-range value for link session numbers */ -#define INVALID_SESSION 0x10000 +#define WILDCARD_SESSION 0x10000 -/* - * Link state events: +/* Link FSM states: */ -#define STARTING_EVT 856384768 /* link processing trigger */ -#define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */ -#define SILENCE_EVT 560817u /* timer dicovered silence from peer */ +enum { + LINK_ESTABLISHED = 0xe, + LINK_ESTABLISHING = 0xe << 4, + LINK_RESET = 0x1 << 8, + LINK_RESETTING = 0x2 << 12, + LINK_PEER_RESET = 0xd << 16, + LINK_FAILINGOVER = 0xf << 20, + LINK_SYNCHING = 0xc << 24 +}; -/* - * State value stored in 'failover_pkts' +/* Link FSM state checking routines */ -#define FIRST_FAILOVER 0xffffu - -static void link_handle_out_of_seq_msg(struct tipc_link *link, - struct sk_buff *skb); -static void tipc_link_proto_rcv(struct tipc_link *link, - struct sk_buff *skb); -static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol); -static void link_state_event(struct tipc_link *l_ptr, u32 event); +static int link_is_up(struct tipc_link *l) +{ + return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); +} + +static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, + struct sk_buff_head *xmitq); +static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, + u16 rcvgap, int tolerance, int priority, + struct sk_buff_head *xmitq); static void link_reset_statistics(struct tipc_link *l_ptr); static void link_print(struct tipc_link *l_ptr, const char *str); -static void tipc_link_sync_xmit(struct tipc_link *l); static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf); -static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb); -static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb); -static bool tipc_link_failover_rcv(struct tipc_link *l, struct sk_buff **skb); -static void link_set_timer(struct tipc_link *link, unsigned long time); + /* - * Simple link routines + * Simple non-static link routines (i.e. referenced outside this file) */ -static unsigned int align(unsigned int i) +bool tipc_link_is_up(struct tipc_link *l) { - return (i + 3) & ~3u; + return link_is_up(l); } -static void tipc_link_release(struct kref *kref) +bool tipc_link_is_reset(struct tipc_link *l) { - kfree(container_of(kref, struct tipc_link, ref)); + return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); } -static void tipc_link_get(struct tipc_link *l_ptr) +bool tipc_link_is_synching(struct tipc_link *l) { - kref_get(&l_ptr->ref); + return l->state == LINK_SYNCHING; } -static void tipc_link_put(struct tipc_link *l_ptr) +bool tipc_link_is_failingover(struct tipc_link *l) { - kref_put(&l_ptr->ref, tipc_link_release); + return l->state == LINK_FAILINGOVER; } -static struct tipc_link *tipc_parallel_link(struct tipc_link *l) +bool tipc_link_is_blocked(struct tipc_link *l) { - if (l->owner->active_links[0] != l) - return l->owner->active_links[0]; - return l->owner->active_links[1]; + return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); } -/* - * Simple non-static link routines (i.e. referenced outside this file) - */ -int tipc_link_is_up(struct tipc_link *l_ptr) +int tipc_link_is_active(struct tipc_link *l) { - if (!l_ptr) - return 0; - return link_working_working(l_ptr) || link_working_unknown(l_ptr); + struct tipc_node *n = l->owner; + + return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l); } -int tipc_link_is_active(struct tipc_link *l_ptr) +static u32 link_own_addr(struct tipc_link *l) { - return (l_ptr->owner->active_links[0] == l_ptr) || - (l_ptr->owner->active_links[1] == l_ptr); + return msg_prevnode(l->pmsg); } /** - * link_timeout - handle expiration of link timer - * @l_ptr: pointer to link + * tipc_link_create - create a new link + * @n: pointer to associated node + * @b: pointer to associated bearer + * @ownnode: identity of own node + * @peer: identity of peer node + * @maddr: media address to be used + * @inputq: queue to put messages ready for delivery + * @namedq: queue to put binding table update messages ready for delivery + * @link: return value, pointer to put the created link + * + * Returns true if link was created, otherwise false */ -static void link_timeout(unsigned long data) +bool tipc_link_create(struct tipc_node *n, struct tipc_bearer *b, u32 session, + u32 ownnode, u32 peer, struct tipc_media_addr *maddr, + struct sk_buff_head *inputq, struct sk_buff_head *namedq, + struct tipc_link **link) { - struct tipc_link *l_ptr = (struct tipc_link *)data; - struct sk_buff *skb; + struct tipc_link *l; + struct tipc_msg *hdr; + char *if_name; + + l = kzalloc(sizeof(*l), GFP_ATOMIC); + if (!l) + return false; + *link = l; + + /* Note: peer i/f name is completed by reset/activate message */ + if_name = strchr(b->name, ':') + 1; + sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown", + tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode), + if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); + + l->addr = peer; + l->media_addr = maddr; + l->owner = n; + l->peer_session = WILDCARD_SESSION; + l->bearer_id = b->identity; + l->tolerance = b->tolerance; + l->net_plane = b->net_plane; + l->advertised_mtu = b->mtu; + l->mtu = b->mtu; + l->priority = b->priority; + tipc_link_set_queue_limits(l, b->window); + l->inputq = inputq; + l->namedq = namedq; + l->state = LINK_RESETTING; + l->pmsg = (struct tipc_msg *)&l->proto_msg; + hdr = l->pmsg; + tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer); + msg_set_size(hdr, sizeof(l->proto_msg)); + msg_set_session(hdr, session); + msg_set_bearer_id(hdr, l->bearer_id); + strcpy((char *)msg_data(hdr), if_name); + __skb_queue_head_init(&l->transmq); + __skb_queue_head_init(&l->backlogq); + __skb_queue_head_init(&l->deferdq); + skb_queue_head_init(&l->wakeupq); + skb_queue_head_init(l->inputq); + return true; +} - tipc_node_lock(l_ptr->owner); +/* tipc_link_build_bcast_sync_msg() - synchronize broadcast link endpoints. + * + * Give a newly added peer node the sequence number where it should + * start receiving and acking broadcast packets. + */ +void tipc_link_build_bcast_sync_msg(struct tipc_link *l, + struct sk_buff_head *xmitq) +{ + struct sk_buff *skb; + struct sk_buff_head list; + u16 last_sent; - /* update counters used in statistical profiling of send traffic */ - l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->transmq); - l_ptr->stats.queue_sz_counts++; + skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, + 0, l->addr, link_own_addr(l), 0, 0, 0); + if (!skb) + return; + last_sent = tipc_bclink_get_last_sent(l->owner->net); + msg_set_last_bcast(buf_msg(skb), last_sent); + __skb_queue_head_init(&list); + __skb_queue_tail(&list, skb); + tipc_link_xmit(l, &list, xmitq); +} - skb = skb_peek(&l_ptr->transmq); - if (skb) { - struct tipc_msg *msg = buf_msg(skb); - u32 length = msg_size(msg); +/** + * tipc_link_fsm_evt - link finite state machine + * @l: pointer to link + * @evt: state machine event to be processed + */ +int tipc_link_fsm_evt(struct tipc_link *l, int evt) +{ + int rc = 0; - if ((msg_user(msg) == MSG_FRAGMENTER) && - (msg_type(msg) == FIRST_FRAGMENT)) { - length = msg_size(msg_get_wrapped(msg)); + switch (l->state) { + case LINK_RESETTING: + switch (evt) { + case LINK_PEER_RESET_EVT: + l->state = LINK_PEER_RESET; + break; + case LINK_RESET_EVT: + l->state = LINK_RESET; + break; + case LINK_FAILURE_EVT: + case LINK_FAILOVER_BEGIN_EVT: + case LINK_ESTABLISH_EVT: + case LINK_FAILOVER_END_EVT: + case LINK_SYNCH_BEGIN_EVT: + case LINK_SYNCH_END_EVT: + default: + goto illegal_evt; } - if (length) { - l_ptr->stats.msg_lengths_total += length; - l_ptr->stats.msg_length_counts++; - if (length <= 64) - l_ptr->stats.msg_length_profile[0]++; - else if (length <= 256) - l_ptr->stats.msg_length_profile[1]++; - else if (length <= 1024) - l_ptr->stats.msg_length_profile[2]++; - else if (length <= 4096) - l_ptr->stats.msg_length_profile[3]++; - else if (length <= 16384) - l_ptr->stats.msg_length_profile[4]++; - else if (length <= 32768) - l_ptr->stats.msg_length_profile[5]++; - else - l_ptr->stats.msg_length_profile[6]++; + break; + case LINK_RESET: + switch (evt) { + case LINK_PEER_RESET_EVT: + l->state = LINK_ESTABLISHING; + break; + case LINK_FAILOVER_BEGIN_EVT: + l->state = LINK_FAILINGOVER; + case LINK_FAILURE_EVT: + case LINK_RESET_EVT: + case LINK_ESTABLISH_EVT: + case LINK_FAILOVER_END_EVT: + break; + case LINK_SYNCH_BEGIN_EVT: + case LINK_SYNCH_END_EVT: + default: + goto illegal_evt; + } + break; + case LINK_PEER_RESET: + switch (evt) { + case LINK_RESET_EVT: + l->state = LINK_ESTABLISHING; + break; + case LINK_PEER_RESET_EVT: + case LINK_ESTABLISH_EVT: + case LINK_FAILURE_EVT: + break; + case LINK_SYNCH_BEGIN_EVT: + case LINK_SYNCH_END_EVT: + case LINK_FAILOVER_BEGIN_EVT: + case LINK_FAILOVER_END_EVT: + default: + goto illegal_evt; } + break; + case LINK_FAILINGOVER: + switch (evt) { + case LINK_FAILOVER_END_EVT: + l->state = LINK_RESET; + break; + case LINK_PEER_RESET_EVT: + case LINK_RESET_EVT: + case LINK_ESTABLISH_EVT: + case LINK_FAILURE_EVT: + break; + case LINK_FAILOVER_BEGIN_EVT: + case LINK_SYNCH_BEGIN_EVT: + case LINK_SYNCH_END_EVT: + default: + goto illegal_evt; + } + break; + case LINK_ESTABLISHING: + switch (evt) { + case LINK_ESTABLISH_EVT: + l->state = LINK_ESTABLISHED; + rc |= TIPC_LINK_UP_EVT; + break; + case LINK_FAILOVER_BEGIN_EVT: + l->state = LINK_FAILINGOVER; + break; + case LINK_PEER_RESET_EVT: + case LINK_RESET_EVT: + case LINK_FAILURE_EVT: + case LINK_SYNCH_BEGIN_EVT: + case LINK_FAILOVER_END_EVT: + break; + case LINK_SYNCH_END_EVT: + default: + goto illegal_evt; + } + break; + case LINK_ESTABLISHED: + switch (evt) { + case LINK_PEER_RESET_EVT: + l->state = LINK_PEER_RESET; + rc |= TIPC_LINK_DOWN_EVT; + break; + case LINK_FAILURE_EVT: + l->state = LINK_RESETTING; + rc |= TIPC_LINK_DOWN_EVT; + break; + case LINK_RESET_EVT: + l->state = LINK_RESET; + break; + case LINK_ESTABLISH_EVT: + case LINK_SYNCH_END_EVT: + break; + case LINK_SYNCH_BEGIN_EVT: + l->state = LINK_SYNCHING; + break; + case LINK_FAILOVER_BEGIN_EVT: + case LINK_FAILOVER_END_EVT: + default: + goto illegal_evt; + } + break; + case LINK_SYNCHING: + switch (evt) { + case LINK_PEER_RESET_EVT: + l->state = LINK_PEER_RESET; + rc |= TIPC_LINK_DOWN_EVT; + break; + case LINK_FAILURE_EVT: + l->state = LINK_RESETTING; + rc |= TIPC_LINK_DOWN_EVT; + break; + case LINK_RESET_EVT: + l->state = LINK_RESET; + break; + case LINK_ESTABLISH_EVT: + case LINK_SYNCH_BEGIN_EVT: + break; + case LINK_SYNCH_END_EVT: + l->state = LINK_ESTABLISHED; + break; + case LINK_FAILOVER_BEGIN_EVT: + case LINK_FAILOVER_END_EVT: + default: + goto illegal_evt; + } + break; + default: + pr_err("Unknown FSM state %x in %s\n", l->state, l->name); } - - /* do all other link processing performed on a periodic basis */ - if (l_ptr->silent_intv_cnt || tipc_bclink_acks_missing(l_ptr->owner)) - link_state_event(l_ptr, SILENCE_EVT); - l_ptr->silent_intv_cnt++; - if (skb_queue_len(&l_ptr->backlogq)) - tipc_link_push_packets(l_ptr); - link_set_timer(l_ptr, l_ptr->keepalive_intv); - tipc_node_unlock(l_ptr->owner); - tipc_link_put(l_ptr); -} - -static void link_set_timer(struct tipc_link *link, unsigned long time) -{ - if (!mod_timer(&link->timer, jiffies + time)) - tipc_link_get(link); + return rc; +illegal_evt: + pr_err("Illegal FSM event %x in state %x on link %s\n", + evt, l->state, l->name); + return rc; } -/** - * tipc_link_create - create a new link - * @n_ptr: pointer to associated node - * @b_ptr: pointer to associated bearer - * @media_addr: media address to use when sending messages over link - * - * Returns pointer to link. +/* link_profile_stats - update statistical profiling of traffic */ -struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, - struct tipc_bearer *b_ptr, - const struct tipc_media_addr *media_addr) +static void link_profile_stats(struct tipc_link *l) { - struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); - struct tipc_link *l_ptr; + struct sk_buff *skb; struct tipc_msg *msg; - char *if_name; - char addr_string[16]; - u32 peer = n_ptr->addr; + int length; - if (n_ptr->link_cnt >= MAX_BEARERS) { - tipc_addr_string_fill(addr_string, n_ptr->addr); - pr_err("Cannot establish %uth link to %s. Max %u allowed.\n", - n_ptr->link_cnt, addr_string, MAX_BEARERS); - return NULL; - } + /* Update counters used in statistical profiling of send traffic */ + l->stats.accu_queue_sz += skb_queue_len(&l->transmq); + l->stats.queue_sz_counts++; - if (n_ptr->links[b_ptr->identity]) { - tipc_addr_string_fill(addr_string, n_ptr->addr); - pr_err("Attempt to establish second link on <%s> to %s\n", - b_ptr->name, addr_string); - return NULL; - } + skb = skb_peek(&l->transmq); + if (!skb) + return; + msg = buf_msg(skb); + length = msg_size(msg); - l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC); - if (!l_ptr) { - pr_warn("Link creation failed, no memory\n"); - return NULL; + if (msg_user(msg) == MSG_FRAGMENTER) { + if (msg_type(msg) != FIRST_FRAGMENT) + return; + length = msg_size(msg_get_wrapped(msg)); } - kref_init(&l_ptr->ref); - l_ptr->addr = peer; - if_name = strchr(b_ptr->name, ':') + 1; - sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown", - tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr), - tipc_node(tn->own_addr), - if_name, - tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); - /* note: peer i/f name is updated by reset/activate message */ - memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr)); - l_ptr->owner = n_ptr; - l_ptr->peer_session = INVALID_SESSION; - l_ptr->bearer_id = b_ptr->identity; - link_set_supervision_props(l_ptr, b_ptr->tolerance); - l_ptr->state = RESET_UNKNOWN; - - l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg; - msg = l_ptr->pmsg; - tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, - l_ptr->addr); - msg_set_size(msg, sizeof(l_ptr->proto_msg)); - msg_set_session(msg, (tn->random & 0xffff)); - msg_set_bearer_id(msg, b_ptr->identity); - strcpy((char *)msg_data(msg), if_name); - l_ptr->net_plane = b_ptr->net_plane; - l_ptr->advertised_mtu = b_ptr->mtu; - l_ptr->mtu = l_ptr->advertised_mtu; - l_ptr->priority = b_ptr->priority; - tipc_link_set_queue_limits(l_ptr, b_ptr->window); - l_ptr->snd_nxt = 1; - __skb_queue_head_init(&l_ptr->transmq); - __skb_queue_head_init(&l_ptr->backlogq); - __skb_queue_head_init(&l_ptr->deferdq); - skb_queue_head_init(&l_ptr->wakeupq); - skb_queue_head_init(&l_ptr->inputq); - skb_queue_head_init(&l_ptr->namedq); - link_reset_statistics(l_ptr); - tipc_node_attach_link(n_ptr, l_ptr); - setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr); - link_state_event(l_ptr, STARTING_EVT); - - return l_ptr; + l->stats.msg_lengths_total += length; + l->stats.msg_length_counts++; + if (length <= 64) + l->stats.msg_length_profile[0]++; + else if (length <= 256) + l->stats.msg_length_profile[1]++; + else if (length <= 1024) + l->stats.msg_length_profile[2]++; + else if (length <= 4096) + l->stats.msg_length_profile[3]++; + else if (length <= 16384) + l->stats.msg_length_profile[4]++; + else if (length <= 32768) + l->stats.msg_length_profile[5]++; + else + l->stats.msg_length_profile[6]++; } -/** - * tipc_link_delete - Delete a link - * @l: link to be deleted +/* tipc_link_timeout - perform periodic task as instructed from node timeout */ -void tipc_link_delete(struct tipc_link *l) +int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) { - tipc_link_reset(l); - if (del_timer(&l->timer)) - tipc_link_put(l); - l->flags |= LINK_STOPPED; - /* Delete link now, or when timer is finished: */ - tipc_link_reset_fragments(l); - tipc_node_detach_link(l->owner, l); - tipc_link_put(l); -} + int rc = 0; + int mtyp = STATE_MSG; + bool xmit = false; + bool prb = false; + + link_profile_stats(l); + + switch (l->state) { + case LINK_ESTABLISHED: + case LINK_SYNCHING: + if (!l->silent_intv_cnt) { + if (tipc_bclink_acks_missing(l->owner)) + xmit = true; + } else if (l->silent_intv_cnt <= l->abort_limit) { + xmit = true; + prb = true; + } else { + rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); + } + l->silent_intv_cnt++; + break; + case LINK_RESET: + xmit = true; + mtyp = RESET_MSG; + break; + case LINK_ESTABLISHING: + xmit = true; + mtyp = ACTIVATE_MSG; + break; + case LINK_PEER_RESET: + case LINK_RESETTING: + case LINK_FAILINGOVER: + break; + default: + break; + } -void tipc_link_delete_list(struct net *net, unsigned int bearer_id) -{ - struct tipc_net *tn = net_generic(net, tipc_net_id); - struct tipc_link *link; - struct tipc_node *node; + if (xmit) + tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq); - rcu_read_lock(); - list_for_each_entry_rcu(node, &tn->node_list, list) { - tipc_node_lock(node); - link = node->links[bearer_id]; - if (link) - tipc_link_delete(link); - tipc_node_unlock(node); - } - rcu_read_unlock(); + return rc; } /** @@ -334,7 +490,7 @@ void tipc_link_delete_list(struct net *net, unsigned int bearer_id) * @link: congested link * @list: message that was attempted sent * Create pseudo msg to send back to user when congestion abates - * Only consumes message if there is an error + * Does not consume buffer list */ static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) { @@ -347,8 +503,7 @@ static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) /* This really cannot happen... */ if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); - tipc_link_reset(link); - goto err; + return -ENOBUFS; } /* Non-blocking sender: */ if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) @@ -358,15 +513,12 @@ static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, addr, addr, oport, 0, 0); if (!skb) - goto err; + return -ENOBUFS; TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); TIPC_SKB_CB(skb)->chain_imp = imp; skb_queue_tail(&link->wakeupq, skb); link->stats.link_congs++; return -ELINKCONG; -err: - __skb_queue_purge(list); - return -ENOBUFS; } /** @@ -388,9 +540,7 @@ void link_prepare_wakeup(struct tipc_link *l) if ((pnd[imp] + l->backlog[imp].len) >= lim) break; skb_unlink(skb, &l->wakeupq); - skb_queue_tail(&l->inputq, skb); - l->owner->inputq = &l->inputq; - l->owner->action_flags |= TIPC_MSG_EVT; + skb_queue_tail(l->inputq, skb); } } @@ -426,208 +576,36 @@ void tipc_link_purge_queues(struct tipc_link *l_ptr) tipc_link_reset_fragments(l_ptr); } -void tipc_link_reset(struct tipc_link *l_ptr) +void tipc_link_reset(struct tipc_link *l) { - u32 prev_state = l_ptr->state; - int was_active_link = tipc_link_is_active(l_ptr); - struct tipc_node *owner = l_ptr->owner; - struct tipc_link *pl = tipc_parallel_link(l_ptr); - - msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff)); + tipc_link_fsm_evt(l, LINK_RESET_EVT); /* Link is down, accept any session */ - l_ptr->peer_session = INVALID_SESSION; - - /* Prepare for renewed mtu size negotiation */ - l_ptr->mtu = l_ptr->advertised_mtu; - - l_ptr->state = RESET_UNKNOWN; + l->peer_session = WILDCARD_SESSION; - if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET)) - return; - - tipc_node_link_down(l_ptr->owner, l_ptr); - tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr); + /* If peer is up, it only accepts an incremented session number */ + msg_set_session(l->pmsg, msg_session(l->pmsg) + 1); - if (was_active_link && tipc_node_is_up(l_ptr->owner) && (pl != l_ptr)) { - l_ptr->flags |= LINK_FAILINGOVER; - l_ptr->failover_checkpt = l_ptr->rcv_nxt; - pl->failover_pkts = FIRST_FAILOVER; - pl->failover_checkpt = l_ptr->rcv_nxt; - pl->failover_skb = l_ptr->reasm_buf; - } else { - kfree_skb(l_ptr->reasm_buf); - } - /* Clean up all queues, except inputq: */ - __skb_queue_purge(&l_ptr->transmq); - __skb_queue_purge(&l_ptr->deferdq); - if (!owner->inputq) - owner->inputq = &l_ptr->inputq; - skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq); - if (!skb_queue_empty(owner->inputq)) - owner->action_flags |= TIPC_MSG_EVT; - tipc_link_purge_backlog(l_ptr); - l_ptr->reasm_buf = NULL; - l_ptr->rcv_unacked = 0; - l_ptr->snd_nxt = 1; - l_ptr->silent_intv_cnt = 0; - l_ptr->stale_count = 0; - link_reset_statistics(l_ptr); -} - -static void link_activate(struct tipc_link *link) -{ - struct tipc_node *node = link->owner; - - link->rcv_nxt = 1; - link->stats.recv_info = 1; - link->silent_intv_cnt = 0; - tipc_node_link_up(node, link); - tipc_bearer_add_dest(node->net, link->bearer_id, link->addr); -} - -/** - * link_state_event - link finite state machine - * @l_ptr: pointer to link - * @event: state machine event to process - */ -static void link_state_event(struct tipc_link *l_ptr, unsigned int event) -{ - struct tipc_link *other; - unsigned long timer_intv = l_ptr->keepalive_intv; - - if (l_ptr->flags & LINK_STOPPED) - return; - - if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT)) - return; /* Not yet. */ - - if (l_ptr->flags & LINK_FAILINGOVER) - return; - - switch (l_ptr->state) { - case WORKING_WORKING: - switch (event) { - case TRAFFIC_MSG_EVT: - case ACTIVATE_MSG: - l_ptr->silent_intv_cnt = 0; - break; - case SILENCE_EVT: - if (!l_ptr->silent_intv_cnt) { - if (tipc_bclink_acks_missing(l_ptr->owner)) - tipc_link_proto_xmit(l_ptr, STATE_MSG, - 0, 0, 0, 0); - break; - } - l_ptr->state = WORKING_UNKNOWN; - tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0); - break; - case RESET_MSG: - pr_debug("%s<%s>, requested by peer\n", - link_rst_msg, l_ptr->name); - tipc_link_reset(l_ptr); - l_ptr->state = RESET_RESET; - tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, - 0, 0, 0, 0); - break; - default: - pr_debug("%s%u in WW state\n", link_unk_evt, event); - } - break; - case WORKING_UNKNOWN: - switch (event) { - case TRAFFIC_MSG_EVT: - case ACTIVATE_MSG: - l_ptr->state = WORKING_WORKING; - l_ptr->silent_intv_cnt = 0; - break; - case RESET_MSG: - pr_debug("%s<%s>, requested by peer while probing\n", - link_rst_msg, l_ptr->name); - tipc_link_reset(l_ptr); - l_ptr->state = RESET_RESET; - tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, - 0, 0, 0, 0); - break; - case SILENCE_EVT: - if (!l_ptr->silent_intv_cnt) { - l_ptr->state = WORKING_WORKING; - if (tipc_bclink_acks_missing(l_ptr->owner)) - tipc_link_proto_xmit(l_ptr, STATE_MSG, - 0, 0, 0, 0); - } else if (l_ptr->silent_intv_cnt < - l_ptr->abort_limit) { - tipc_link_proto_xmit(l_ptr, STATE_MSG, - 1, 0, 0, 0); - } else { /* Link has failed */ - pr_debug("%s<%s>, peer not responding\n", - link_rst_msg, l_ptr->name); - tipc_link_reset(l_ptr); - l_ptr->state = RESET_UNKNOWN; - tipc_link_proto_xmit(l_ptr, RESET_MSG, - 0, 0, 0, 0); - } - break; - default: - pr_err("%s%u in WU state\n", link_unk_evt, event); - } - break; - case RESET_UNKNOWN: - switch (event) { - case TRAFFIC_MSG_EVT: - break; - case ACTIVATE_MSG: - other = l_ptr->owner->active_links[0]; - if (other && link_working_unknown(other)) - break; - l_ptr->state = WORKING_WORKING; - link_activate(l_ptr); - tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0); - if (l_ptr->owner->working_links == 1) - tipc_link_sync_xmit(l_ptr); - break; - case RESET_MSG: - l_ptr->state = RESET_RESET; - tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, - 1, 0, 0, 0); - break; - case STARTING_EVT: - l_ptr->flags |= LINK_STARTED; - link_set_timer(l_ptr, timer_intv); - break; - case SILENCE_EVT: - tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0); - break; - default: - pr_err("%s%u in RU state\n", link_unk_evt, event); - } - break; - case RESET_RESET: - switch (event) { - case TRAFFIC_MSG_EVT: - case ACTIVATE_MSG: - other = l_ptr->owner->active_links[0]; - if (other && link_working_unknown(other)) - break; - l_ptr->state = WORKING_WORKING; - link_activate(l_ptr); - tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0); - if (l_ptr->owner->working_links == 1) - tipc_link_sync_xmit(l_ptr); - break; - case RESET_MSG: - break; - case SILENCE_EVT: - tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, - 0, 0, 0, 0); - break; - default: - pr_err("%s%u in RR state\n", link_unk_evt, event); - } - break; - default: - pr_err("Unknown link state %u/%u\n", l_ptr->state, event); - } + /* Prepare for renewed mtu size negotiation */ + l->mtu = l->advertised_mtu; + + /* Clean up all queues: */ + __skb_queue_purge(&l->transmq); + __skb_queue_purge(&l->deferdq); + skb_queue_splice_init(&l->wakeupq, l->inputq); + + tipc_link_purge_backlog(l); + kfree_skb(l->reasm_buf); + kfree_skb(l->failover_reasm_skb); + l->reasm_buf = NULL; + l->failover_reasm_skb = NULL; + l->rcv_unacked = 0; + l->snd_nxt = 1; + l->rcv_nxt = 1; + l->silent_intv_cnt = 0; + l->stats.recv_info = 0; + l->stale_count = 0; + link_reset_statistics(l); } /** @@ -635,8 +613,7 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event) * @link: link to use * @list: chain of buffers containing message * - * Consumes the buffer chain, except when returning -ELINKCONG, - * since the caller then may want to make more send attempts. + * Consumes the buffer chain, except when returning an error code, * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted */ @@ -650,7 +627,7 @@ int __tipc_link_xmit(struct net *net, struct tipc_link *link, u16 ack = mod(link->rcv_nxt - 1); u16 seqno = link->snd_nxt; u16 bc_last_in = link->owner->bclink.last_in; - struct tipc_media_addr *addr = &link->media_addr; + struct tipc_media_addr *addr = link->media_addr; struct sk_buff_head *transmq = &link->transmq; struct sk_buff_head *backlogq = &link->backlogq; struct sk_buff *skb, *bskb; @@ -660,10 +637,9 @@ int __tipc_link_xmit(struct net *net, struct tipc_link *link, if (unlikely(link->backlog[i].len >= link->backlog[i].limit)) return link_schedule_user(link, list); } - if (unlikely(msg_size(msg) > mtu)) { - __skb_queue_purge(list); + if (unlikely(msg_size(msg) > mtu)) return -EMSGSIZE; - } + /* Prepare each packet for sending, and add to relevant queue: */ while (skb_queue_len(list)) { skb = skb_peek(list); @@ -700,101 +676,76 @@ int __tipc_link_xmit(struct net *net, struct tipc_link *link, return 0; } -static void skb2list(struct sk_buff *skb, struct sk_buff_head *list) -{ - skb_queue_head_init(list); - __skb_queue_tail(list, skb); -} - -static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb) -{ - struct sk_buff_head head; - - skb2list(skb, &head); - return __tipc_link_xmit(link->owner->net, link, &head); -} - -/* tipc_link_xmit_skb(): send single buffer to destination - * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE - * messages, which will not be rejected - * The only exception is datagram messages rerouted after secondary - * lookup, which are rare and safe to dispose of anyway. - * TODO: Return real return value, and let callers use - * tipc_wait_for_sendpkt() where applicable - */ -int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, - u32 selector) -{ - struct sk_buff_head head; - int rc; - - skb2list(skb, &head); - rc = tipc_link_xmit(net, &head, dnode, selector); - if (rc == -ELINKCONG) - kfree_skb(skb); - return 0; -} - /** - * tipc_link_xmit() is the general link level function for message sending - * @net: the applicable net namespace + * tipc_link_xmit(): enqueue buffer list according to queue situation + * @link: link to use * @list: chain of buffers containing message - * @dsz: amount of user data to be sent - * @dnode: address of destination node - * @selector: a number used for deterministic link selection - * Consumes the buffer chain, except when returning -ELINKCONG - * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE + * @xmitq: returned list of packets to be sent by caller + * + * Consumes the buffer chain, except when returning -ELINKCONG, + * since the caller then may want to make more send attempts. + * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS + * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted */ -int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode, - u32 selector) +int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, + struct sk_buff_head *xmitq) { - struct tipc_link *link = NULL; - struct tipc_node *node; - int rc = -EHOSTUNREACH; + struct tipc_msg *hdr = buf_msg(skb_peek(list)); + unsigned int maxwin = l->window; + unsigned int i, imp = msg_importance(hdr); + unsigned int mtu = l->mtu; + u16 ack = l->rcv_nxt - 1; + u16 seqno = l->snd_nxt; + u16 bc_last_in = l->owner->bclink.last_in; + struct sk_buff_head *transmq = &l->transmq; + struct sk_buff_head *backlogq = &l->backlogq; + struct sk_buff *skb, *_skb, *bskb; - node = tipc_node_find(net, dnode); - if (node) { - tipc_node_lock(node); - link = node->active_links[selector & 1]; - if (link) - rc = __tipc_link_xmit(net, link, list); - tipc_node_unlock(node); - tipc_node_put(node); - } - if (link) - return rc; - - if (likely(in_own_node(net, dnode))) { - tipc_sk_rcv(net, list); - return 0; + /* Match msg importance against this and all higher backlog limits: */ + for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { + if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) + return link_schedule_user(l, list); } + if (unlikely(msg_size(hdr) > mtu)) + return -EMSGSIZE; - __skb_queue_purge(list); - return rc; -} - -/* - * tipc_link_sync_xmit - synchronize broadcast link endpoints. - * - * Give a newly added peer node the sequence number where it should - * start receiving and acking broadcast packets. - * - * Called with node locked - */ -static void tipc_link_sync_xmit(struct tipc_link *link) -{ - struct sk_buff *skb; - struct tipc_msg *msg; - - skb = tipc_buf_acquire(INT_H_SIZE); - if (!skb) - return; + /* Prepare each packet for sending, and add to relevant queue: */ + while (skb_queue_len(list)) { + skb = skb_peek(list); + hdr = buf_msg(skb); + msg_set_seqno(hdr, seqno); + msg_set_ack(hdr, ack); + msg_set_bcast_ack(hdr, bc_last_in); - msg = buf_msg(skb); - tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG, - INT_H_SIZE, link->addr); - msg_set_last_bcast(msg, link->owner->bclink.acked); - __tipc_link_xmit_skb(link, skb); + if (likely(skb_queue_len(transmq) < maxwin)) { + _skb = skb_clone(skb, GFP_ATOMIC); + if (!_skb) + return -ENOBUFS; + __skb_dequeue(list); + __skb_queue_tail(transmq, skb); + __skb_queue_tail(xmitq, _skb); + l->rcv_unacked = 0; + seqno++; + continue; + } + if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { + kfree_skb(__skb_dequeue(list)); + l->stats.sent_bundled++; + continue; + } + if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { + kfree_skb(__skb_dequeue(list)); + __skb_queue_tail(backlogq, bskb); + l->backlog[msg_importance(buf_msg(bskb))].len++; + l->stats.sent_bundled++; + l->stats.sent_bundles++; + continue; + } + l->backlog[imp].len += skb_queue_len(list); + skb_queue_splice_tail_init(list, backlogq); + } + l->snd_nxt = seqno; + return 0; } /* @@ -842,29 +793,37 @@ void tipc_link_push_packets(struct tipc_link *link) link->rcv_unacked = 0; __skb_queue_tail(&link->transmq, skb); tipc_bearer_send(link->owner->net, link->bearer_id, - skb, &link->media_addr); + skb, link->media_addr); } link->snd_nxt = seqno; } -void tipc_link_reset_all(struct tipc_node *node) +void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) { - char addr_string[16]; - u32 i; - - tipc_node_lock(node); + struct sk_buff *skb, *_skb; + struct tipc_msg *hdr; + u16 seqno = l->snd_nxt; + u16 ack = l->rcv_nxt - 1; - pr_warn("Resetting all links to %s\n", - tipc_addr_string_fill(addr_string, node->addr)); - - for (i = 0; i < MAX_BEARERS; i++) { - if (node->links[i]) { - link_print(node->links[i], "Resetting link\n"); - tipc_link_reset(node->links[i]); - } + while (skb_queue_len(&l->transmq) < l->window) { + skb = skb_peek(&l->backlogq); + if (!skb) + break; + _skb = skb_clone(skb, GFP_ATOMIC); + if (!_skb) + break; + __skb_dequeue(&l->backlogq); + hdr = buf_msg(skb); + l->backlog[msg_importance(hdr)].len--; + __skb_queue_tail(&l->transmq, skb); + __skb_queue_tail(xmitq, _skb); + msg_set_ack(hdr, ack); + msg_set_seqno(hdr, seqno); + msg_set_bcast_ack(hdr, l->owner->bclink.last_in); + l->rcv_unacked = 0; + seqno++; } - - tipc_node_unlock(node); + l->snd_nxt = seqno; } static void link_retransmit_failure(struct tipc_link *l_ptr, @@ -877,9 +836,12 @@ static void link_retransmit_failure(struct tipc_link *l_ptr, if (l_ptr->addr) { /* Handle failure on standard link */ - link_print(l_ptr, "Resetting link\n"); - tipc_link_reset(l_ptr); - + link_print(l_ptr, "Resetting link "); + pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", + msg_user(msg), msg_type(msg), msg_size(msg), + msg_errcode(msg)); + pr_info("sqno %u, prev: %x, src: %x\n", + msg_seqno(msg), msg_prevnode(msg), msg_orignode(msg)); } else { /* Handle failure on broadcast link */ struct tipc_node *n_ptr; @@ -934,191 +896,45 @@ void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1)); msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, - &l_ptr->media_addr); + l_ptr->media_addr); retransmits--; l_ptr->stats.retransmitted++; } } -/* link_synch(): check if all packets arrived before the synch - * point have been consumed - * Returns true if the parallel links are synched, otherwise false - */ -static bool link_synch(struct tipc_link *l) +static int tipc_link_retransm(struct tipc_link *l, int retransm, + struct sk_buff_head *xmitq) { - unsigned int post_synch; - struct tipc_link *pl; + struct sk_buff *_skb, *skb = skb_peek(&l->transmq); + struct tipc_msg *hdr; - pl = tipc_parallel_link(l); - if (pl == l) - goto synched; - - /* Was last pre-synch packet added to input queue ? */ - if (less_eq(pl->rcv_nxt, l->synch_point)) - return false; - - /* Is it still in the input queue ? */ - post_synch = mod(pl->rcv_nxt - l->synch_point) - 1; - if (skb_queue_len(&pl->inputq) > post_synch) - return false; -synched: - l->flags &= ~LINK_SYNCHING; - return true; -} - -static void link_retrieve_defq(struct tipc_link *link, - struct sk_buff_head *list) -{ - u16 seq_no; - - if (skb_queue_empty(&link->deferdq)) - return; - - seq_no = buf_seqno(skb_peek(&link->deferdq)); - if (seq_no == link->rcv_nxt) - skb_queue_splice_tail_init(&link->deferdq, list); -} - -/** - * tipc_rcv - process TIPC packets/messages arriving from off-node - * @net: the applicable net namespace - * @skb: TIPC packet - * @b_ptr: pointer to bearer message arrived on - * - * Invoked with no locks held. Bearer pointer must point to a valid bearer - * structure (i.e. cannot be NULL), but bearer can be inactive. - */ -void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) -{ - struct tipc_net *tn = net_generic(net, tipc_net_id); - struct sk_buff_head head; - struct tipc_node *n_ptr; - struct tipc_link *l_ptr; - struct sk_buff *skb1, *tmp; - struct tipc_msg *msg; - u16 seq_no; - u16 ackd; - u32 released; - - skb2list(skb, &head); - - while ((skb = __skb_dequeue(&head))) { - /* Ensure message is well-formed */ - if (unlikely(!tipc_msg_validate(skb))) - goto discard; - - /* Handle arrival of a non-unicast link message */ - msg = buf_msg(skb); - if (unlikely(msg_non_seq(msg))) { - if (msg_user(msg) == LINK_CONFIG) - tipc_disc_rcv(net, skb, b_ptr); - else - tipc_bclink_rcv(net, skb); - continue; - } - - /* Discard unicast link messages destined for another node */ - if (unlikely(!msg_short(msg) && - (msg_destnode(msg) != tn->own_addr))) - goto discard; - - /* Locate neighboring node that sent message */ - n_ptr = tipc_node_find(net, msg_prevnode(msg)); - if (unlikely(!n_ptr)) - goto discard; - - tipc_node_lock(n_ptr); - /* Locate unicast link endpoint that should handle message */ - l_ptr = n_ptr->links[b_ptr->identity]; - if (unlikely(!l_ptr)) - goto unlock; - - /* Verify that communication with node is currently allowed */ - if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) && - msg_user(msg) == LINK_PROTOCOL && - (msg_type(msg) == RESET_MSG || - msg_type(msg) == ACTIVATE_MSG) && - !msg_redundant_link(msg)) - n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN; - - if (tipc_node_blocked(n_ptr)) - goto unlock; - - /* Validate message sequence number info */ - seq_no = msg_seqno(msg); - ackd = msg_ack(msg); - - /* Release acked messages */ - if (unlikely(n_ptr->bclink.acked != msg_bcast_ack(msg))) - tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg)); - - released = 0; - skb_queue_walk_safe(&l_ptr->transmq, skb1, tmp) { - if (more(buf_seqno(skb1), ackd)) - break; - __skb_unlink(skb1, &l_ptr->transmq); - kfree_skb(skb1); - released = 1; - } - - /* Try sending any messages link endpoint has pending */ - if (unlikely(skb_queue_len(&l_ptr->backlogq))) - tipc_link_push_packets(l_ptr); - - if (released && !skb_queue_empty(&l_ptr->wakeupq)) - link_prepare_wakeup(l_ptr); - - /* Process the incoming packet */ - if (unlikely(!link_working_working(l_ptr))) { - if (msg_user(msg) == LINK_PROTOCOL) { - tipc_link_proto_rcv(l_ptr, skb); - link_retrieve_defq(l_ptr, &head); - skb = NULL; - goto unlock; - } - - /* Traffic message. Conditionally activate link */ - link_state_event(l_ptr, TRAFFIC_MSG_EVT); - - if (link_working_working(l_ptr)) { - /* Re-insert buffer in front of queue */ - __skb_queue_head(&head, skb); - skb = NULL; - goto unlock; - } - goto unlock; - } - - /* Link is now in state WORKING_WORKING */ - if (unlikely(seq_no != l_ptr->rcv_nxt)) { - link_handle_out_of_seq_msg(l_ptr, skb); - link_retrieve_defq(l_ptr, &head); - skb = NULL; - goto unlock; - } - l_ptr->silent_intv_cnt = 0; + if (!skb) + return 0; - /* Synchronize with parallel link if applicable */ - if (unlikely((l_ptr->flags & LINK_SYNCHING) && !msg_dup(msg))) { - if (!link_synch(l_ptr)) - goto unlock; - } - l_ptr->rcv_nxt++; - if (unlikely(!skb_queue_empty(&l_ptr->deferdq))) - link_retrieve_defq(l_ptr, &head); - if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) { - l_ptr->stats.sent_acks++; - tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0); - } - tipc_link_input(l_ptr, skb); - skb = NULL; -unlock: - tipc_node_unlock(n_ptr); - tipc_node_put(n_ptr); -discard: - if (unlikely(skb)) - kfree_skb(skb); + /* Detect repeated retransmit failures on same packet */ + if (likely(l->last_retransm != buf_seqno(skb))) { + l->last_retransm = buf_seqno(skb); + l->stale_count = 1; + } else if (++l->stale_count > 100) { + link_retransmit_failure(l, skb); + return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); + } + skb_queue_walk(&l->transmq, skb) { + if (!retransm) + return 0; + hdr = buf_msg(skb); + _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); + if (!_skb) + return 0; + hdr = buf_msg(_skb); + msg_set_ack(hdr, l->rcv_nxt - 1); + msg_set_bcast_ack(hdr, l->owner->bclink.last_in); + _skb->priority = TC_PRIO_CONTROL; + __skb_queue_tail(xmitq, _skb); + retransm--; + l->stats.retransmitted++; } + return 0; } /* tipc_data_input - deliver data and name distr msgs to upper layer @@ -1126,29 +942,22 @@ discard: * Consumes buffer if message is of right type * Node lock must be held */ -static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) +static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb, + struct sk_buff_head *inputq) { struct tipc_node *node = link->owner; - struct tipc_msg *msg = buf_msg(skb); - u32 dport = msg_destport(msg); - switch (msg_user(msg)) { + switch (msg_user(buf_msg(skb))) { case TIPC_LOW_IMPORTANCE: case TIPC_MEDIUM_IMPORTANCE: case TIPC_HIGH_IMPORTANCE: case TIPC_CRITICAL_IMPORTANCE: case CONN_MANAGER: - if (tipc_skb_queue_tail(&link->inputq, skb, dport)) { - node->inputq = &link->inputq; - node->action_flags |= TIPC_MSG_EVT; - } + __skb_queue_tail(inputq, skb); return true; case NAME_DISTRIBUTOR: node->bclink.recv_permitted = true; - node->namedq = &link->namedq; - skb_queue_tail(&link->namedq, skb); - if (skb_queue_len(&link->namedq) == 1) - node->action_flags |= TIPC_NAMED_MSG_EVT; + skb_queue_tail(link->namedq, skb); return true; case MSG_BUNDLER: case TUNNEL_PROTOCOL: @@ -1165,54 +974,160 @@ static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) /* tipc_link_input - process packet that has passed link protocol check * * Consumes buffer - * Node lock must be held */ -static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb) +static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, + struct sk_buff_head *inputq) { - struct tipc_node *node = link->owner; - struct tipc_msg *msg = buf_msg(skb); + struct tipc_node *node = l->owner; + struct tipc_msg *hdr = buf_msg(skb); + struct sk_buff **reasm_skb = &l->reasm_buf; struct sk_buff *iskb; + int usr = msg_user(hdr); + int rc = 0; int pos = 0; + int ipos = 0; - if (likely(tipc_data_input(link, skb))) - return; + if (unlikely(usr == TUNNEL_PROTOCOL)) { + if (msg_type(hdr) == SYNCH_MSG) { + __skb_queue_purge(&l->deferdq); + goto drop; + } + if (!tipc_msg_extract(skb, &iskb, &ipos)) + return rc; + kfree_skb(skb); + skb = iskb; + hdr = buf_msg(skb); + if (less(msg_seqno(hdr), l->drop_point)) + goto drop; + if (tipc_data_input(l, skb, inputq)) + return rc; + usr = msg_user(hdr); + reasm_skb = &l->failover_reasm_skb; + } - switch (msg_user(msg)) { - case TUNNEL_PROTOCOL: - if (msg_dup(msg)) { - link->flags |= LINK_SYNCHING; - link->synch_point = msg_seqno(msg_get_wrapped(msg)); - kfree_skb(skb); - break; + if (usr == MSG_BUNDLER) { + l->stats.recv_bundles++; + l->stats.recv_bundled += msg_msgcnt(hdr); + while (tipc_msg_extract(skb, &iskb, &pos)) + tipc_data_input(l, iskb, inputq); + return 0; + } else if (usr == MSG_FRAGMENTER) { + l->stats.recv_fragments++; + if (tipc_buf_append(reasm_skb, &skb)) { + l->stats.recv_fragmented++; + tipc_data_input(l, skb, inputq); + } else if (!*reasm_skb) { + return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); } - if (!tipc_link_failover_rcv(link, &skb)) - break; - if (msg_user(buf_msg(skb)) != MSG_BUNDLER) { - tipc_data_input(link, skb); + return 0; + } else if (usr == BCAST_PROTOCOL) { + tipc_link_sync_rcv(node, skb); + return 0; + } +drop: + kfree_skb(skb); + return 0; +} + +static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) +{ + bool released = false; + struct sk_buff *skb, *tmp; + + skb_queue_walk_safe(&l->transmq, skb, tmp) { + if (more(buf_seqno(skb), acked)) break; + __skb_unlink(skb, &l->transmq); + kfree_skb(skb); + released = true; + } + return released; +} + +/* tipc_link_rcv - process TIPC packets/messages arriving from off-node + * @link: the link that should handle the message + * @skb: TIPC packet + * @xmitq: queue to place packets to be sent after this call + */ +int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, + struct sk_buff_head *xmitq) +{ + struct sk_buff_head *arrvq = &l->deferdq; + struct sk_buff_head tmpq; + struct tipc_msg *hdr; + u16 seqno, rcv_nxt; + int rc = 0; + + __skb_queue_head_init(&tmpq); + + if (unlikely(!__tipc_skb_queue_sorted(arrvq, skb))) { + if (!(skb_queue_len(arrvq) % TIPC_NACK_INTV)) + tipc_link_build_proto_msg(l, STATE_MSG, 0, + 0, 0, 0, xmitq); + return rc; + } + + while ((skb = skb_peek(arrvq))) { + hdr = buf_msg(skb); + + /* Verify and update link state */ + if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) { + __skb_dequeue(arrvq); + rc = tipc_link_proto_rcv(l, skb, xmitq); + continue; } - case MSG_BUNDLER: - link->stats.recv_bundles++; - link->stats.recv_bundled += msg_msgcnt(msg); - while (tipc_msg_extract(skb, &iskb, &pos)) - tipc_data_input(link, iskb); - break; - case MSG_FRAGMENTER: - link->stats.recv_fragments++; - if (tipc_buf_append(&link->reasm_buf, &skb)) { - link->stats.recv_fragmented++; - tipc_data_input(link, skb); - } else if (!link->reasm_buf) { - tipc_link_reset(link); + if (unlikely(!link_is_up(l))) { + rc = tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT); + if (!link_is_up(l)) { + kfree_skb(__skb_dequeue(arrvq)); + goto exit; + } } - break; - case BCAST_PROTOCOL: - tipc_link_sync_rcv(node, skb); - break; - default: - break; - }; + + l->silent_intv_cnt = 0; + + /* Forward queues and wake up waiting users */ + if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { + tipc_link_advance_backlog(l, xmitq); + if (unlikely(!skb_queue_empty(&l->wakeupq))) + link_prepare_wakeup(l); + } + + /* Defer reception if there is a gap in the sequence */ + seqno = msg_seqno(hdr); + rcv_nxt = l->rcv_nxt; + if (unlikely(less(rcv_nxt, seqno))) { + l->stats.deferred_recv++; + goto exit; + } + + __skb_dequeue(arrvq); + + /* Drop if packet already received */ + if (unlikely(more(rcv_nxt, seqno))) { + l->stats.duplicates++; + kfree_skb(skb); + goto exit; + } + + /* Packet can be delivered */ + l->rcv_nxt++; + l->stats.recv_info++; + if (unlikely(!tipc_data_input(l, skb, &tmpq))) + rc = tipc_link_input(l, skb, &tmpq); + + /* Ack at regular intervals */ + if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) { + l->rcv_unacked = 0; + l->stats.sent_acks++; + tipc_link_build_proto_msg(l, STATE_MSG, + 0, 0, 0, 0, xmitq); + } + } +exit: + tipc_skb_queue_splice_tail(&tmpq, l->inputq); + return rc; } /** @@ -1255,458 +1170,250 @@ u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) } /* - * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet + * Send protocol message to the other endpoint. */ -static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr, - struct sk_buff *buf) +void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg, + u32 gap, u32 tolerance, u32 priority) { - u32 seq_no = buf_seqno(buf); + struct sk_buff *skb = NULL; + struct sk_buff_head xmitq; - if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) { - tipc_link_proto_rcv(l_ptr, buf); + __skb_queue_head_init(&xmitq); + tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap, + tolerance, priority, &xmitq); + skb = __skb_dequeue(&xmitq); + if (!skb) return; - } - - /* Record OOS packet arrival */ - l_ptr->silent_intv_cnt = 0; + tipc_bearer_send(l->owner->net, l->bearer_id, skb, l->media_addr); + l->rcv_unacked = 0; + kfree_skb(skb); +} - /* - * Discard packet if a duplicate; otherwise add it to deferred queue - * and notify peer of gap as per protocol specification - */ - if (less(seq_no, l_ptr->rcv_nxt)) { - l_ptr->stats.duplicates++; - kfree_skb(buf); +/* tipc_link_build_proto_msg: prepare link protocol message for transmission + */ +static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, + u16 rcvgap, int tolerance, int priority, + struct sk_buff_head *xmitq) +{ + struct sk_buff *skb = NULL; + struct tipc_msg *hdr = l->pmsg; + u16 snd_nxt = l->snd_nxt; + u16 rcv_nxt = l->rcv_nxt; + u16 rcv_last = rcv_nxt - 1; + int node_up = l->owner->bclink.recv_permitted; + + /* Don't send protocol message during reset or link failover */ + if (tipc_link_is_blocked(l)) return; - } - if (tipc_link_defer_pkt(&l_ptr->deferdq, buf)) { - l_ptr->stats.deferred_recv++; - if ((skb_queue_len(&l_ptr->deferdq) % TIPC_MIN_LINK_WIN) == 1) - tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0); + msg_set_type(hdr, mtyp); + msg_set_net_plane(hdr, l->net_plane); + msg_set_bcast_ack(hdr, l->owner->bclink.last_in); + msg_set_last_bcast(hdr, tipc_bclink_get_last_sent(l->owner->net)); + msg_set_link_tolerance(hdr, tolerance); + msg_set_linkprio(hdr, priority); + msg_set_redundant_link(hdr, node_up); + msg_set_seq_gap(hdr, 0); + + /* Compatibility: created msg must not be in sequence with pkt flow */ + msg_set_seqno(hdr, snd_nxt + U16_MAX / 2); + + if (mtyp == STATE_MSG) { + if (!tipc_link_is_up(l)) + return; + msg_set_next_sent(hdr, snd_nxt); + + /* Override rcvgap if there are packets in deferred queue */ + if (!skb_queue_empty(&l->deferdq)) + rcvgap = buf_seqno(skb_peek(&l->deferdq)) - rcv_nxt; + if (rcvgap) { + msg_set_seq_gap(hdr, rcvgap); + l->stats.sent_nacks++; + } + msg_set_ack(hdr, rcv_last); + msg_set_probe(hdr, probe); + if (probe) + l->stats.sent_probes++; + l->stats.sent_states++; } else { - l_ptr->stats.duplicates++; + /* RESET_MSG or ACTIVATE_MSG */ + msg_set_max_pkt(hdr, l->advertised_mtu); + msg_set_ack(hdr, l->rcv_nxt - 1); + msg_set_next_sent(hdr, 1); } + skb = tipc_buf_acquire(msg_size(hdr)); + if (!skb) + return; + skb_copy_to_linear_data(skb, hdr, msg_size(hdr)); + skb->priority = TC_PRIO_CONTROL; + __skb_queue_tail(xmitq, skb); } -/* - * Send protocol message to the other endpoint. +/* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets + * with contents of the link's tranmsit and backlog queues. */ -void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg, - u32 gap, u32 tolerance, u32 priority) +void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, + int mtyp, struct sk_buff_head *xmitq) { - struct sk_buff *buf = NULL; - struct tipc_msg *msg = l_ptr->pmsg; - u32 msg_size = sizeof(l_ptr->proto_msg); - int r_flag; - u16 last_rcv; - - /* Don't send protocol message during link failover */ - if (l_ptr->flags & LINK_FAILINGOVER) - return; + struct sk_buff *skb, *tnlskb; + struct tipc_msg *hdr, tnlhdr; + struct sk_buff_head *queue = &l->transmq; + struct sk_buff_head tmpxq, tnlq; + u16 pktlen, pktcnt, seqno = l->snd_nxt; - /* Abort non-RESET send if communication with node is prohibited */ - if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG)) + if (!tnl) return; - /* Create protocol message with "out-of-sequence" sequence number */ - msg_set_type(msg, msg_typ); - msg_set_net_plane(msg, l_ptr->net_plane); - msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); - msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net)); - - if (msg_typ == STATE_MSG) { - u16 next_sent = l_ptr->snd_nxt; + skb_queue_head_init(&tnlq); + skb_queue_head_init(&tmpxq); - if (!tipc_link_is_up(l_ptr)) + /* At least one packet required for safe algorithm => add dummy */ + skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, + BASIC_H_SIZE, 0, l->addr, link_own_addr(l), + 0, 0, TIPC_ERR_NO_PORT); + if (!skb) { + pr_warn("%sunable to create tunnel packet\n", link_co_err); + return; + } + skb_queue_tail(&tnlq, skb); + tipc_link_xmit(l, &tnlq, &tmpxq); + __skb_queue_purge(&tmpxq); + + /* Initialize reusable tunnel packet header */ + tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL, + mtyp, INT_H_SIZE, l->addr); + pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); + msg_set_msgcnt(&tnlhdr, pktcnt); + msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); +tnl: + /* Wrap each packet into a tunnel packet */ + skb_queue_walk(queue, skb) { + hdr = buf_msg(skb); + if (queue == &l->backlogq) + msg_set_seqno(hdr, seqno++); + pktlen = msg_size(hdr); + msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); + tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE); + if (!tnlskb) { + pr_warn("%sunable to send packet\n", link_co_err); return; - msg_set_next_sent(msg, next_sent); - if (!skb_queue_empty(&l_ptr->deferdq)) { - last_rcv = buf_seqno(skb_peek(&l_ptr->deferdq)); - gap = mod(last_rcv - l_ptr->rcv_nxt); } - msg_set_seq_gap(msg, gap); - if (gap) - l_ptr->stats.sent_nacks++; - msg_set_link_tolerance(msg, tolerance); - msg_set_linkprio(msg, priority); - msg_set_max_pkt(msg, l_ptr->mtu); - msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1)); - msg_set_probe(msg, probe_msg != 0); - if (probe_msg) - l_ptr->stats.sent_probes++; - l_ptr->stats.sent_states++; - } else { /* RESET_MSG or ACTIVATE_MSG */ - msg_set_ack(msg, mod(l_ptr->failover_checkpt - 1)); - msg_set_seq_gap(msg, 0); - msg_set_next_sent(msg, 1); - msg_set_probe(msg, 0); - msg_set_link_tolerance(msg, l_ptr->tolerance); - msg_set_linkprio(msg, l_ptr->priority); - msg_set_max_pkt(msg, l_ptr->advertised_mtu); + skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); + skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); + __skb_queue_tail(&tnlq, tnlskb); + } + if (queue != &l->backlogq) { + queue = &l->backlogq; + goto tnl; } - r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr)); - msg_set_redundant_link(msg, r_flag); - msg_set_linkprio(msg, l_ptr->priority); - msg_set_size(msg, msg_size); - - msg_set_seqno(msg, mod(l_ptr->snd_nxt + (0xffff / 2))); - - buf = tipc_buf_acquire(msg_size); - if (!buf) - return; + tipc_link_xmit(tnl, &tnlq, xmitq); - skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg)); - buf->priority = TC_PRIO_CONTROL; - tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf, - &l_ptr->media_addr); - l_ptr->rcv_unacked = 0; - kfree_skb(buf); + if (mtyp == FAILOVER_MSG) { + tnl->drop_point = l->rcv_nxt; + tnl->failover_reasm_skb = l->reasm_buf; + l->reasm_buf = NULL; + } } -/* - * Receive protocol message : +/* tipc_link_proto_rcv(): receive link level protocol message : * Note that network plane id propagates through the network, and may - * change at any time. The node with lowest address rules + * change at any time. The node with lowest numerical id determines + * network plane */ -static void tipc_link_proto_rcv(struct tipc_link *l_ptr, - struct sk_buff *buf) +static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, + struct sk_buff_head *xmitq) { - u32 rec_gap = 0; - u32 msg_tol; - struct tipc_msg *msg = buf_msg(buf); + struct tipc_msg *hdr = buf_msg(skb); + u16 rcvgap = 0; + u16 nacked_gap = msg_seq_gap(hdr); + u16 peers_snd_nxt = msg_next_sent(hdr); + u16 peers_tol = msg_link_tolerance(hdr); + u16 peers_prio = msg_linkprio(hdr); + u16 rcv_nxt = l->rcv_nxt; + char *if_name; + int rc = 0; - if (l_ptr->flags & LINK_FAILINGOVER) + if (tipc_link_is_blocked(l)) goto exit; - if (l_ptr->net_plane != msg_net_plane(msg)) - if (link_own_addr(l_ptr) > msg_prevnode(msg)) - l_ptr->net_plane = msg_net_plane(msg); - - switch (msg_type(msg)) { + if (link_own_addr(l) > msg_prevnode(hdr)) + l->net_plane = msg_net_plane(hdr); + switch (msg_type(hdr)) { case RESET_MSG: - if (!link_working_unknown(l_ptr) && - (l_ptr->peer_session != INVALID_SESSION)) { - if (less_eq(msg_session(msg), l_ptr->peer_session)) - break; /* duplicate or old reset: ignore */ - } - - if (!msg_redundant_link(msg) && (link_working_working(l_ptr) || - link_working_unknown(l_ptr))) { - /* - * peer has lost contact -- don't allow peer's links - * to reactivate before we recognize loss & clean up - */ - l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN; - } - - link_state_event(l_ptr, RESET_MSG); + /* Ignore duplicate RESET with old session number */ + if ((less_eq(msg_session(hdr), l->peer_session)) && + (l->peer_session != WILDCARD_SESSION)) + break; /* fall thru' */ - case ACTIVATE_MSG: - /* Update link settings according other endpoint's values */ - strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg)); - msg_tol = msg_link_tolerance(msg); - if (msg_tol > l_ptr->tolerance) - link_set_supervision_props(l_ptr, msg_tol); - - if (msg_linkprio(msg) > l_ptr->priority) - l_ptr->priority = msg_linkprio(msg); - - if (l_ptr->mtu > msg_max_pkt(msg)) - l_ptr->mtu = msg_max_pkt(msg); - - /* Synchronize broadcast link info, if not done previously */ - if (!tipc_node_is_up(l_ptr->owner)) { - l_ptr->owner->bclink.last_sent = - l_ptr->owner->bclink.last_in = - msg_last_bcast(msg); - l_ptr->owner->bclink.oos_state = 0; - } - - l_ptr->peer_session = msg_session(msg); - l_ptr->peer_bearer_id = msg_bearer_id(msg); - - if (msg_type(msg) == ACTIVATE_MSG) - link_state_event(l_ptr, ACTIVATE_MSG); - break; - case STATE_MSG: + case ACTIVATE_MSG: - msg_tol = msg_link_tolerance(msg); - if (msg_tol) - link_set_supervision_props(l_ptr, msg_tol); - - if (msg_linkprio(msg) && - (msg_linkprio(msg) != l_ptr->priority)) { - pr_debug("%s<%s>, priority change %u->%u\n", - link_rst_msg, l_ptr->name, - l_ptr->priority, msg_linkprio(msg)); - l_ptr->priority = msg_linkprio(msg); - tipc_link_reset(l_ptr); /* Enforce change to take effect */ + /* Complete own link name with peer's interface name */ + if_name = strrchr(l->name, ':') + 1; + if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) break; - } - - /* Record reception; force mismatch at next timeout: */ - l_ptr->silent_intv_cnt = 0; - - link_state_event(l_ptr, TRAFFIC_MSG_EVT); - l_ptr->stats.recv_states++; - if (link_reset_unknown(l_ptr)) + if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) break; + strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME); - if (less_eq(l_ptr->rcv_nxt, msg_next_sent(msg))) - rec_gap = mod(msg_next_sent(msg) - l_ptr->rcv_nxt); + /* Update own tolerance if peer indicates a non-zero value */ + if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) + l->tolerance = peers_tol; - if (msg_probe(msg)) - l_ptr->stats.recv_probes++; + /* Update own priority if peer's priority is higher */ + if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) + l->priority = peers_prio; - /* Protocol message before retransmits, reduce loss risk */ - if (l_ptr->owner->bclink.recv_permitted) - tipc_bclink_update_link_state(l_ptr->owner, - msg_last_bcast(msg)); - - if (rec_gap || (msg_probe(msg))) { - tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, - rec_gap, 0, 0); - } - if (msg_seq_gap(msg)) { - l_ptr->stats.recv_nacks++; - tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->transmq), - msg_seq_gap(msg)); + if (msg_type(hdr) == RESET_MSG) { + rc |= tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); + } else if (!link_is_up(l)) { + tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); + rc |= tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT); } + l->peer_session = msg_session(hdr); + l->peer_bearer_id = msg_bearer_id(hdr); + if (l->mtu > msg_max_pkt(hdr)) + l->mtu = msg_max_pkt(hdr); break; - } -exit: - kfree_skb(buf); -} - - -/* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to - * a different bearer. Owner node is locked. - */ -static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr, - struct tipc_msg *tunnel_hdr, - struct tipc_msg *msg, - u32 selector) -{ - struct tipc_link *tunnel; - struct sk_buff *skb; - u32 length = msg_size(msg); - - tunnel = l_ptr->owner->active_links[selector & 1]; - if (!tipc_link_is_up(tunnel)) { - pr_warn("%stunnel link no longer available\n", link_co_err); - return; - } - msg_set_size(tunnel_hdr, length + INT_H_SIZE); - skb = tipc_buf_acquire(length + INT_H_SIZE); - if (!skb) { - pr_warn("%sunable to send tunnel msg\n", link_co_err); - return; - } - skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE); - skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length); - __tipc_link_xmit_skb(tunnel, skb); -} - - -/* tipc_link_failover_send_queue(): A link has gone down, but a second - * link is still active. We can do failover. Tunnel the failing link's - * whole send queue via the remaining link. This way, we don't lose - * any packets, and sequence order is preserved for subsequent traffic - * sent over the remaining link. Owner node is locked. - */ -void tipc_link_failover_send_queue(struct tipc_link *l_ptr) -{ - int msgcount; - struct tipc_link *tunnel = l_ptr->owner->active_links[0]; - struct tipc_msg tunnel_hdr; - struct sk_buff *skb; - int split_bundles; - - if (!tunnel) - return; - tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, TUNNEL_PROTOCOL, - FAILOVER_MSG, INT_H_SIZE, l_ptr->addr); - - skb_queue_walk(&l_ptr->backlogq, skb) { - msg_set_seqno(buf_msg(skb), l_ptr->snd_nxt); - l_ptr->snd_nxt = mod(l_ptr->snd_nxt + 1); - } - skb_queue_splice_tail_init(&l_ptr->backlogq, &l_ptr->transmq); - tipc_link_purge_backlog(l_ptr); - msgcount = skb_queue_len(&l_ptr->transmq); - msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); - msg_set_msgcnt(&tunnel_hdr, msgcount); - - if (skb_queue_empty(&l_ptr->transmq)) { - skb = tipc_buf_acquire(INT_H_SIZE); - if (skb) { - skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE); - msg_set_size(&tunnel_hdr, INT_H_SIZE); - __tipc_link_xmit_skb(tunnel, skb); - } else { - pr_warn("%sunable to send changeover msg\n", - link_co_err); - } - return; - } - - split_bundles = (l_ptr->owner->active_links[0] != - l_ptr->owner->active_links[1]); + case STATE_MSG: - skb_queue_walk(&l_ptr->transmq, skb) { - struct tipc_msg *msg = buf_msg(skb); + /* Update own tolerance if peer indicates a non-zero value */ + if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) + l->tolerance = peers_tol; - if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) { - struct tipc_msg *m = msg_get_wrapped(msg); - unchar *pos = (unchar *)m; + l->silent_intv_cnt = 0; + l->stats.recv_states++; + if (msg_probe(hdr)) + l->stats.recv_probes++; + rc = tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT); + if (!link_is_up(l)) + break; - msgcount = msg_msgcnt(msg); - while (msgcount--) { - msg_set_seqno(m, msg_seqno(msg)); - tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m, - msg_link_selector(m)); - pos += align(msg_size(m)); - m = (struct tipc_msg *)pos; - } - } else { - tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg, - msg_link_selector(msg)); + /* Send NACK if peer has sent pkts we haven't received yet */ + if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) + rcvgap = peers_snd_nxt - l->rcv_nxt; + if (rcvgap || (msg_probe(hdr))) + tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap, + 0, 0, xmitq); + tipc_link_release_pkts(l, msg_ack(hdr)); + + /* If NACK, retransmit will now start at right position */ + if (nacked_gap) { + rc = tipc_link_retransm(l, nacked_gap, xmitq); + l->stats.recv_nacks++; } - } -} - -/* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a - * duplicate of the first link's send queue via the new link. This way, we - * are guaranteed that currently queued packets from a socket are delivered - * before future traffic from the same socket, even if this is using the - * new link. The last arriving copy of each duplicate packet is dropped at - * the receiving end by the regular protocol check, so packet cardinality - * and sequence order is preserved per sender/receiver socket pair. - * Owner node is locked. - */ -void tipc_link_dup_queue_xmit(struct tipc_link *link, - struct tipc_link *tnl) -{ - struct sk_buff *skb; - struct tipc_msg tnl_hdr; - struct sk_buff_head *queue = &link->transmq; - int mcnt; - u16 seqno; - - tipc_msg_init(link_own_addr(link), &tnl_hdr, TUNNEL_PROTOCOL, - SYNCH_MSG, INT_H_SIZE, link->addr); - mcnt = skb_queue_len(&link->transmq) + skb_queue_len(&link->backlogq); - msg_set_msgcnt(&tnl_hdr, mcnt); - msg_set_bearer_id(&tnl_hdr, link->peer_bearer_id); - -tunnel_queue: - skb_queue_walk(queue, skb) { - struct sk_buff *outskb; - struct tipc_msg *msg = buf_msg(skb); - u32 len = msg_size(msg); - msg_set_ack(msg, mod(link->rcv_nxt - 1)); - msg_set_bcast_ack(msg, link->owner->bclink.last_in); - msg_set_size(&tnl_hdr, len + INT_H_SIZE); - outskb = tipc_buf_acquire(len + INT_H_SIZE); - if (outskb == NULL) { - pr_warn("%sunable to send duplicate msg\n", - link_co_err); - return; - } - skb_copy_to_linear_data(outskb, &tnl_hdr, INT_H_SIZE); - skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, - skb->data, len); - __tipc_link_xmit_skb(tnl, outskb); - if (!tipc_link_is_up(link)) - return; - } - if (queue == &link->backlogq) - return; - seqno = link->snd_nxt; - skb_queue_walk(&link->backlogq, skb) { - msg_set_seqno(buf_msg(skb), seqno); - seqno = mod(seqno + 1); - } - queue = &link->backlogq; - goto tunnel_queue; -} - -/* tipc_link_failover_rcv(): Receive a tunnelled FAILOVER_MSG packet - * Owner node is locked. - */ -static bool tipc_link_failover_rcv(struct tipc_link *link, - struct sk_buff **skb) -{ - struct tipc_msg *msg = buf_msg(*skb); - struct sk_buff *iskb = NULL; - struct tipc_link *pl = NULL; - int bearer_id = msg_bearer_id(msg); - int pos = 0; - - if (msg_type(msg) != FAILOVER_MSG) { - pr_warn("%sunknown tunnel pkt received\n", link_co_err); - goto exit; - } - if (bearer_id >= MAX_BEARERS) - goto exit; - - if (bearer_id == link->bearer_id) - goto exit; - - pl = link->owner->links[bearer_id]; - if (pl && tipc_link_is_up(pl)) - tipc_link_reset(pl); - - if (link->failover_pkts == FIRST_FAILOVER) - link->failover_pkts = msg_msgcnt(msg); - - /* Should we expect an inner packet? */ - if (!link->failover_pkts) - goto exit; - - if (!tipc_msg_extract(*skb, &iskb, &pos)) { - pr_warn("%sno inner failover pkt\n", link_co_err); - *skb = NULL; - goto exit; - } - link->failover_pkts--; - *skb = NULL; - - /* Was this packet already delivered? */ - if (less(buf_seqno(iskb), link->failover_checkpt)) { - kfree_skb(iskb); - iskb = NULL; - goto exit; - } - if (msg_user(buf_msg(iskb)) == MSG_FRAGMENTER) { - link->stats.recv_fragments++; - tipc_buf_append(&link->failover_skb, &iskb); + tipc_link_advance_backlog(l, xmitq); + if (unlikely(!skb_queue_empty(&l->wakeupq))) + link_prepare_wakeup(l); } exit: - if (!link->failover_pkts && pl) - pl->flags &= ~LINK_FAILINGOVER; - kfree_skb(*skb); - *skb = iskb; - return *skb; -} - -static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol) -{ - unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; - - if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) - return; - - l_ptr->tolerance = tol; - l_ptr->keepalive_intv = msecs_to_jiffies(intv); - l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->keepalive_intv)); + kfree_skb(skb); + return rc; } void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) @@ -1743,7 +1450,7 @@ static struct tipc_node *tipc_link_find_owner(struct net *net, list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { tipc_node_lock(n_ptr); for (i = 0; i < MAX_BEARERS; i++) { - l_ptr = n_ptr->links[i]; + l_ptr = n_ptr->links[i].link; if (l_ptr && !strcmp(l_ptr->name, link_name)) { *bearer_id = i; found_node = n_ptr; @@ -1770,27 +1477,16 @@ static void link_reset_statistics(struct tipc_link *l_ptr) l_ptr->stats.recv_info = l_ptr->rcv_nxt; } -static void link_print(struct tipc_link *l_ptr, const char *str) +static void link_print(struct tipc_link *l, const char *str) { - struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id); - struct tipc_bearer *b_ptr; - - rcu_read_lock(); - b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); - if (b_ptr) - pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name); - rcu_read_unlock(); - - if (link_working_unknown(l_ptr)) - pr_cont(":WU\n"); - else if (link_reset_reset(l_ptr)) - pr_cont(":RR\n"); - else if (link_reset_unknown(l_ptr)) - pr_cont(":RU\n"); - else if (link_working_working(l_ptr)) - pr_cont(":WW\n"); - else - pr_cont("\n"); + struct sk_buff *hskb = skb_peek(&l->transmq); + u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt; + u16 tail = l->snd_nxt - 1; + + pr_info("%s Link <%s> state %x\n", str, l->name, l->state); + pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", + skb_queue_len(&l->transmq), head, tail, + skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); } /* Parse and validate nested (link) properties valid for media, bearer and link @@ -1865,7 +1561,7 @@ int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) tipc_node_lock(node); - link = node->links[bearer_id]; + link = node->links[bearer_id].link; if (!link) { res = -EINVAL; goto out; @@ -1885,7 +1581,7 @@ int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) u32 tol; tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); - link_set_supervision_props(link, tol); + link->tolerance = tol; tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0); } if (props[TIPC_NLA_PROP_PRIO]) { @@ -2055,10 +1751,11 @@ static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, for (i = *prev_link; i < MAX_BEARERS; i++) { *prev_link = i; - if (!node->links[i]) + if (!node->links[i].link) continue; - err = __tipc_nl_add_link(net, msg, node->links[i], NLM_F_MULTI); + err = __tipc_nl_add_link(net, msg, + node->links[i].link, NLM_F_MULTI); if (err) return err; } @@ -2172,7 +1869,7 @@ int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) return -EINVAL; tipc_node_lock(node); - link = node->links[bearer_id]; + link = node->links[bearer_id].link; if (!link) { tipc_node_unlock(node); nlmsg_free(msg.skb); @@ -2227,7 +1924,7 @@ int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) tipc_node_lock(node); - link = node->links[bearer_id]; + link = node->links[bearer_id].link; if (!link) { tipc_node_unlock(node); return -EINVAL; |