diff options
| -rw-r--r-- | include/net/sch_generic.h | 3 | ||||
| -rw-r--r-- | net/sched/cls_api.c | 77 |
2 files changed, 70 insertions, 10 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index bd9125b0481f..17d8cfd0efda 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -275,8 +275,7 @@ typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); struct tcf_chain { struct tcf_proto __rcu *filter_chain; - tcf_chain_head_change_t *chain_head_change; - void *chain_head_change_priv; + struct list_head filter_chain_list; struct list_head list; struct tcf_block *block; u32 index; /* chain index */ diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index 6708b6953bfa..e6b16b300844 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -179,6 +179,12 @@ static void tcf_proto_destroy(struct tcf_proto *tp) kfree_rcu(tp, rcu); } +struct tcf_filter_chain_list_item { + struct list_head list; + tcf_chain_head_change_t *chain_head_change; + void *chain_head_change_priv; +}; + static struct tcf_chain *tcf_chain_create(struct tcf_block *block, u32 chain_index) { @@ -187,6 +193,7 @@ static struct tcf_chain *tcf_chain_create(struct tcf_block *block, chain = kzalloc(sizeof(*chain), GFP_KERNEL); if (!chain) return NULL; + INIT_LIST_HEAD(&chain->filter_chain_list); list_add_tail(&chain->list, &block->chain_list); chain->block = block; chain->index = chain_index; @@ -194,12 +201,19 @@ static struct tcf_chain *tcf_chain_create(struct tcf_block *block, return chain; } +static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item, + struct tcf_proto *tp_head) +{ + if (item->chain_head_change) + item->chain_head_change(tp_head, item->chain_head_change_priv); +} static void tcf_chain_head_change(struct tcf_chain *chain, struct tcf_proto *tp_head) { - if (chain->chain_head_change) - chain->chain_head_change(tp_head, - chain->chain_head_change_priv); + struct tcf_filter_chain_list_item *item; + + list_for_each_entry(item, &chain->filter_chain_list, list) + tcf_chain_head_change_item(item, tp_head); } static void tcf_chain_flush(struct tcf_chain *chain) @@ -280,6 +294,50 @@ static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, tcf_block_offload_cmd(block, q, ei, TC_BLOCK_UNBIND); } +static int +tcf_chain_head_change_cb_add(struct tcf_chain *chain, + struct tcf_block_ext_info *ei, + struct netlink_ext_ack *extack) +{ + struct tcf_filter_chain_list_item *item; + + item = kmalloc(sizeof(*item), GFP_KERNEL); + if (!item) { + NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed"); + return -ENOMEM; + } + item->chain_head_change = ei->chain_head_change; + item->chain_head_change_priv = ei->chain_head_change_priv; + if (chain->filter_chain) + tcf_chain_head_change_item(item, chain->filter_chain); + list_add(&item->list, &chain->filter_chain_list); + return 0; +} + +static void +tcf_chain_head_change_cb_del(struct tcf_chain *chain, + struct tcf_block_ext_info *ei) +{ + struct tcf_filter_chain_list_item *item; + + list_for_each_entry(item, &chain->filter_chain_list, list) { + if ((!ei->chain_head_change && !ei->chain_head_change_priv) || + (item->chain_head_change == ei->chain_head_change && + item->chain_head_change_priv == ei->chain_head_change_priv)) { + tcf_chain_head_change_item(item, NULL); + list_del(&item->list); + kfree(item); + return; + } + } + WARN_ON(1); +} + +static struct tcf_chain *tcf_block_chain_zero(struct tcf_block *block) +{ + return list_first_entry(&block->chain_list, struct tcf_chain, list); +} + int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, struct tcf_block_ext_info *ei, struct netlink_ext_ack *extack) @@ -302,9 +360,10 @@ int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, err = -ENOMEM; goto err_chain_create; } - WARN_ON(!ei->chain_head_change); - chain->chain_head_change = ei->chain_head_change; - chain->chain_head_change_priv = ei->chain_head_change_priv; + err = tcf_chain_head_change_cb_add(tcf_block_chain_zero(block), + ei, extack); + if (err) + goto err_chain_head_change_cb_add; block->net = qdisc_net(q); block->q = q; tcf_block_offload_bind(block, q, ei); @@ -313,6 +372,8 @@ int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, err_chain_create: kfree(block); +err_chain_head_change_cb_add: + kfree(chain); return err; } EXPORT_SYMBOL(tcf_block_get_ext); @@ -351,6 +412,7 @@ void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, */ if (!block) return; + tcf_chain_head_change_cb_del(tcf_block_chain_zero(block), ei); list_for_each_entry(chain, &block->chain_list, list) tcf_chain_hold(chain); @@ -364,8 +426,7 @@ void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, tcf_chain_put(chain); /* Finally, put chain 0 and allow block to be freed. */ - chain = list_first_entry(&block->chain_list, struct tcf_chain, list); - tcf_chain_put(chain); + tcf_chain_put(tcf_block_chain_zero(block)); } EXPORT_SYMBOL(tcf_block_put_ext); |