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Merge branch 'dccp' of git://eden-feed.erg.abdn.ac.uk/net-next-2.6
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| /* | ||
| * net/dccp/qpolicy.c | ||
| * | ||
| * Policy-based packet dequeueing interface for DCCP. | ||
| * | ||
| * Copyright (c) 2008 Tomasz Grobelny <tomasz@grobelny.oswiecenia.net> | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License v2 | ||
| * as published by the Free Software Foundation. | ||
| */ | ||
| #include "dccp.h" | ||
|
|
||
| /* | ||
| * Simple Dequeueing Policy: | ||
| * If tx_qlen is different from 0, enqueue up to tx_qlen elements. | ||
| */ | ||
| static void qpolicy_simple_push(struct sock *sk, struct sk_buff *skb) | ||
| { | ||
| skb_queue_tail(&sk->sk_write_queue, skb); | ||
| } | ||
|
|
||
| static bool qpolicy_simple_full(struct sock *sk) | ||
| { | ||
| return dccp_sk(sk)->dccps_tx_qlen && | ||
| sk->sk_write_queue.qlen >= dccp_sk(sk)->dccps_tx_qlen; | ||
| } | ||
|
|
||
| static struct sk_buff *qpolicy_simple_top(struct sock *sk) | ||
| { | ||
| return skb_peek(&sk->sk_write_queue); | ||
| } | ||
|
|
||
| /* | ||
| * Priority-based Dequeueing Policy: | ||
| * If tx_qlen is different from 0 and the queue has reached its upper bound | ||
| * of tx_qlen elements, replace older packets lowest-priority-first. | ||
| */ | ||
| static struct sk_buff *qpolicy_prio_best_skb(struct sock *sk) | ||
| { | ||
| struct sk_buff *skb, *best = NULL; | ||
|
|
||
| skb_queue_walk(&sk->sk_write_queue, skb) | ||
| if (best == NULL || skb->priority > best->priority) | ||
| best = skb; | ||
| return best; | ||
| } | ||
|
|
||
| static struct sk_buff *qpolicy_prio_worst_skb(struct sock *sk) | ||
| { | ||
| struct sk_buff *skb, *worst = NULL; | ||
|
|
||
| skb_queue_walk(&sk->sk_write_queue, skb) | ||
| if (worst == NULL || skb->priority < worst->priority) | ||
| worst = skb; | ||
| return worst; | ||
| } | ||
|
|
||
| static bool qpolicy_prio_full(struct sock *sk) | ||
| { | ||
| if (qpolicy_simple_full(sk)) | ||
| dccp_qpolicy_drop(sk, qpolicy_prio_worst_skb(sk)); | ||
| return false; | ||
| } | ||
|
|
||
| /** | ||
| * struct dccp_qpolicy_operations - TX Packet Dequeueing Interface | ||
| * @push: add a new @skb to the write queue | ||
| * @full: indicates that no more packets will be admitted | ||
| * @top: peeks at whatever the queueing policy defines as its `top' | ||
| */ | ||
| static struct dccp_qpolicy_operations { | ||
| void (*push) (struct sock *sk, struct sk_buff *skb); | ||
| bool (*full) (struct sock *sk); | ||
| struct sk_buff* (*top) (struct sock *sk); | ||
| __be32 params; | ||
|
|
||
| } qpol_table[DCCPQ_POLICY_MAX] = { | ||
| [DCCPQ_POLICY_SIMPLE] = { | ||
| .push = qpolicy_simple_push, | ||
| .full = qpolicy_simple_full, | ||
| .top = qpolicy_simple_top, | ||
| .params = 0, | ||
| }, | ||
| [DCCPQ_POLICY_PRIO] = { | ||
| .push = qpolicy_simple_push, | ||
| .full = qpolicy_prio_full, | ||
| .top = qpolicy_prio_best_skb, | ||
| .params = DCCP_SCM_PRIORITY, | ||
| }, | ||
| }; | ||
|
|
||
| /* | ||
| * Externally visible interface | ||
| */ | ||
| void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb) | ||
| { | ||
| qpol_table[dccp_sk(sk)->dccps_qpolicy].push(sk, skb); | ||
| } | ||
|
|
||
| bool dccp_qpolicy_full(struct sock *sk) | ||
| { | ||
| return qpol_table[dccp_sk(sk)->dccps_qpolicy].full(sk); | ||
| } | ||
|
|
||
| void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb) | ||
| { | ||
| if (skb != NULL) { | ||
| skb_unlink(skb, &sk->sk_write_queue); | ||
| kfree_skb(skb); | ||
| } | ||
| } | ||
|
|
||
| struct sk_buff *dccp_qpolicy_top(struct sock *sk) | ||
| { | ||
| return qpol_table[dccp_sk(sk)->dccps_qpolicy].top(sk); | ||
| } | ||
|
|
||
| struct sk_buff *dccp_qpolicy_pop(struct sock *sk) | ||
| { | ||
| struct sk_buff *skb = dccp_qpolicy_top(sk); | ||
|
|
||
| if (skb != NULL) { | ||
| /* Clear any skb fields that we used internally */ | ||
| skb->priority = 0; | ||
| skb_unlink(skb, &sk->sk_write_queue); | ||
| } | ||
| return skb; | ||
| } | ||
|
|
||
| bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param) | ||
| { | ||
| /* check if exactly one bit is set */ | ||
| if (!param || (param & (param - 1))) | ||
| return false; | ||
| return (qpol_table[dccp_sk(sk)->dccps_qpolicy].params & param) == param; | ||
| } |