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-rw-r--r--net/tipc/link.c124
1 files changed, 71 insertions, 53 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 6cc75ffd9e2c..fb72031228c9 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -44,6 +44,7 @@
#include "netlink.h"
#include "monitor.h"
#include "trace.h"
+#include "crypto.h"
#include <linux/pkt_sched.h>
@@ -160,6 +161,7 @@ struct tipc_link {
struct {
u16 len;
u16 limit;
+ struct sk_buff *target_bskb;
} backlog[5];
u16 snd_nxt;
u16 window;
@@ -396,6 +398,15 @@ int tipc_link_mtu(struct tipc_link *l)
return l->mtu;
}
+int tipc_link_mss(struct tipc_link *l)
+{
+#ifdef CONFIG_TIPC_CRYPTO
+ return l->mtu - INT_H_SIZE - EMSG_OVERHEAD;
+#else
+ return l->mtu - INT_H_SIZE;
+#endif
+}
+
u16 tipc_link_rcv_nxt(struct tipc_link *l)
{
return l->rcv_nxt;
@@ -880,6 +891,7 @@ static void link_prepare_wakeup(struct tipc_link *l)
void tipc_link_reset(struct tipc_link *l)
{
struct sk_buff_head list;
+ u32 imp;
__skb_queue_head_init(&list);
@@ -901,11 +913,10 @@ void tipc_link_reset(struct tipc_link *l)
__skb_queue_purge(&l->deferdq);
__skb_queue_purge(&l->backlogq);
__skb_queue_purge(&l->failover_deferdq);
- l->backlog[TIPC_LOW_IMPORTANCE].len = 0;
- l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0;
- l->backlog[TIPC_HIGH_IMPORTANCE].len = 0;
- l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0;
- l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0;
+ for (imp = 0; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) {
+ l->backlog[imp].len = 0;
+ l->backlog[imp].target_bskb = NULL;
+ }
kfree_skb(l->reasm_buf);
kfree_skb(l->reasm_tnlmsg);
kfree_skb(l->failover_reasm_skb);
@@ -939,16 +950,18 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
struct sk_buff_head *xmitq)
{
struct tipc_msg *hdr = buf_msg(skb_peek(list));
- unsigned int maxwin = l->window;
- int imp = msg_importance(hdr);
- unsigned int mtu = l->mtu;
+ struct sk_buff_head *backlogq = &l->backlogq;
+ struct sk_buff_head *transmq = &l->transmq;
+ struct sk_buff *skb, *_skb;
+ u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
u16 ack = l->rcv_nxt - 1;
u16 seqno = l->snd_nxt;
- u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
- struct sk_buff_head *transmq = &l->transmq;
- struct sk_buff_head *backlogq = &l->backlogq;
- struct sk_buff *skb, *_skb, *bskb;
int pkt_cnt = skb_queue_len(list);
+ int imp = msg_importance(hdr);
+ unsigned int mss = tipc_link_mss(l);
+ unsigned int maxwin = l->window;
+ unsigned int mtu = l->mtu;
+ bool new_bundle;
int rc = 0;
if (unlikely(msg_size(hdr) > mtu)) {
@@ -974,20 +987,18 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
}
/* 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_ack);
-
+ while ((skb = __skb_dequeue(list))) {
if (likely(skb_queue_len(transmq) < maxwin)) {
+ hdr = buf_msg(skb);
+ msg_set_seqno(hdr, seqno);
+ msg_set_ack(hdr, ack);
+ msg_set_bcast_ack(hdr, bc_ack);
_skb = skb_clone(skb, GFP_ATOMIC);
if (!_skb) {
+ kfree_skb(skb);
__skb_queue_purge(list);
return -ENOBUFS;
}
- __skb_dequeue(list);
__skb_queue_tail(transmq, skb);
/* next retransmit attempt */
if (link_is_bc_sndlink(l))
@@ -999,20 +1010,25 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
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++;
+ if (tipc_msg_try_bundle(l->backlog[imp].target_bskb, &skb,
+ mss, l->addr, &new_bundle)) {
+ if (skb) {
+ /* Keep a ref. to the skb for next try */
+ l->backlog[imp].target_bskb = skb;
+ l->backlog[imp].len++;
+ __skb_queue_tail(backlogq, skb);
+ } else {
+ if (new_bundle) {
+ l->stats.sent_bundles++;
+ l->stats.sent_bundled++;
+ }
+ l->stats.sent_bundled++;
+ }
continue;
}
- l->backlog[imp].len += skb_queue_len(list);
+ l->backlog[imp].target_bskb = NULL;
+ l->backlog[imp].len += (1 + skb_queue_len(list));
+ __skb_queue_tail(backlogq, skb);
skb_queue_splice_tail_init(list, backlogq);
}
l->snd_nxt = seqno;
@@ -1027,6 +1043,7 @@ static void tipc_link_advance_backlog(struct tipc_link *l,
u16 seqno = l->snd_nxt;
u16 ack = l->rcv_nxt - 1;
u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
+ u32 imp;
while (skb_queue_len(&l->transmq) < l->window) {
skb = skb_peek(&l->backlogq);
@@ -1037,7 +1054,10 @@ static void tipc_link_advance_backlog(struct tipc_link *l,
break;
__skb_dequeue(&l->backlogq);
hdr = buf_msg(skb);
- l->backlog[msg_importance(hdr)].len--;
+ imp = msg_importance(hdr);
+ l->backlog[imp].len--;
+ if (unlikely(skb == l->backlog[imp].target_bskb))
+ l->backlog[imp].target_bskb = NULL;
__skb_queue_tail(&l->transmq, skb);
/* next retransmit attempt */
if (link_is_bc_sndlink(l))
@@ -1077,7 +1097,7 @@ static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r,
return false;
if (!time_after(jiffies, TIPC_SKB_CB(skb)->retr_stamp +
- msecs_to_jiffies(r->tolerance)))
+ msecs_to_jiffies(r->tolerance * 10)))
return false;
hdr = buf_msg(skb);
@@ -1144,7 +1164,7 @@ static int tipc_link_bc_retrans(struct tipc_link *l, struct tipc_link *r,
if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr))
continue;
TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM;
- _skb = __pskb_copy(skb, LL_MAX_HEADER + MIN_H_SIZE, GFP_ATOMIC);
+ _skb = pskb_copy(skb, GFP_ATOMIC);
if (!_skb)
return 0;
hdr = buf_msg(_skb);
@@ -1420,8 +1440,7 @@ next_gap_ack:
if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr))
continue;
TIPC_SKB_CB(skb)->nxt_retr = TIPC_UC_RETR_TIME;
- _skb = __pskb_copy(skb, LL_MAX_HEADER + MIN_H_SIZE,
- GFP_ATOMIC);
+ _skb = pskb_copy(skb, GFP_ATOMIC);
if (!_skb)
continue;
hdr = buf_msg(_skb);
@@ -1721,21 +1740,6 @@ void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
return;
__skb_queue_head_init(&tnlq);
- __skb_queue_head_init(&tmpxq);
- __skb_queue_head_init(&frags);
-
- /* 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, tipc_own_addr(l->net),
- 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);
-
/* Link Synching:
* From now on, send only one single ("dummy") SYNCH message
* to peer. The SYNCH message does not contain any data, just
@@ -1761,6 +1765,20 @@ void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
return;
}
+ __skb_queue_head_init(&tmpxq);
+ __skb_queue_head_init(&frags);
+ /* 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, tipc_own_addr(l->net),
+ 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(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL,
mtyp, INT_H_SIZE, l->addr);
@@ -1866,7 +1884,7 @@ void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl,
tipc_link_create_dummy_tnl_msg(tnl, xmitq);
- /* This failover link enpoint was never established before,
+ /* This failover link endpoint was never established before,
* so it has not received anything from peer.
* Otherwise, it must be a normal failover situation or the
* node has entered SELF_DOWN_PEER_LEAVING and both peer nodes
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.