mirror of
https://github.com/torvalds/linux.git
synced 2024-11-06 20:21:57 +00:00
openvswitch: Split ovs_flow_cmd_new_or_set().
Following patch will be easier to reason about with separate ovs_flow_cmd_new() and ovs_flow_cmd_set() functions. Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com> Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
This commit is contained in:
Jarno Rajahalme
Pravin B Shelar
parent
aed067783e
commit
37bdc87ba0
@ -792,15 +792,129 @@ static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
|
||||
return skb;
|
||||
}
|
||||
|
||||
static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
|
||||
static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
|
||||
{
|
||||
struct nlattr **a = info->attrs;
|
||||
struct ovs_header *ovs_header = info->userhdr;
|
||||
struct sw_flow_key key, masked_key;
|
||||
struct sw_flow *flow = NULL;
|
||||
struct sw_flow *flow;
|
||||
struct sw_flow_mask mask;
|
||||
struct sk_buff *reply;
|
||||
struct datapath *dp;
|
||||
struct sw_flow_actions *acts;
|
||||
struct sw_flow_match match;
|
||||
int error;
|
||||
|
||||
/* Extract key. */
|
||||
error = -EINVAL;
|
||||
if (!a[OVS_FLOW_ATTR_KEY])
|
||||
goto error;
|
||||
|
||||
ovs_match_init(&match, &key, &mask);
|
||||
error = ovs_nla_get_match(&match,
|
||||
a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
|
||||
if (error)
|
||||
goto error;
|
||||
|
||||
/* Validate actions. */
|
||||
error = -EINVAL;
|
||||
if (!a[OVS_FLOW_ATTR_ACTIONS])
|
||||
goto error;
|
||||
|
||||
acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
|
||||
error = PTR_ERR(acts);
|
||||
if (IS_ERR(acts))
|
||||
goto error;
|
||||
|
||||
ovs_flow_mask_key(&masked_key, &key, &mask);
|
||||
error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
|
||||
&masked_key, 0, &acts);
|
||||
if (error) {
|
||||
OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
|
||||
goto err_kfree;
|
||||
}
|
||||
|
||||
ovs_lock();
|
||||
dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
|
||||
error = -ENODEV;
|
||||
if (!dp)
|
||||
goto err_unlock_ovs;
|
||||
|
||||
/* Check if this is a duplicate flow */
|
||||
flow = ovs_flow_tbl_lookup(&dp->table, &key);
|
||||
if (!flow) {
|
||||
/* Allocate flow. */
|
||||
flow = ovs_flow_alloc();
|
||||
if (IS_ERR(flow)) {
|
||||
error = PTR_ERR(flow);
|
||||
goto err_unlock_ovs;
|
||||
}
|
||||
|
||||
flow->key = masked_key;
|
||||
flow->unmasked_key = key;
|
||||
rcu_assign_pointer(flow->sf_acts, acts);
|
||||
|
||||
/* Put flow in bucket. */
|
||||
error = ovs_flow_tbl_insert(&dp->table, flow, &mask);
|
||||
if (error) {
|
||||
acts = NULL;
|
||||
goto err_flow_free;
|
||||
}
|
||||
} else {
|
||||
struct sw_flow_actions *old_acts;
|
||||
|
||||
/* Bail out if we're not allowed to modify an existing flow.
|
||||
* We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
|
||||
* because Generic Netlink treats the latter as a dump
|
||||
* request. We also accept NLM_F_EXCL in case that bug ever
|
||||
* gets fixed.
|
||||
*/
|
||||
error = -EEXIST;
|
||||
if (info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
|
||||
goto err_unlock_ovs;
|
||||
|
||||
/* The unmasked key has to be the same for flow updates. */
|
||||
if (!ovs_flow_cmp_unmasked_key(flow, &match))
|
||||
goto err_unlock_ovs;
|
||||
|
||||
/* Update actions. */
|
||||
old_acts = ovsl_dereference(flow->sf_acts);
|
||||
rcu_assign_pointer(flow->sf_acts, acts);
|
||||
ovs_nla_free_flow_actions(old_acts);
|
||||
}
|
||||
|
||||
reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
|
||||
info, OVS_FLOW_CMD_NEW, false);
|
||||
ovs_unlock();
|
||||
|
||||
if (reply) {
|
||||
if (!IS_ERR(reply))
|
||||
ovs_notify(&dp_flow_genl_family, reply, info);
|
||||
else
|
||||
netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
|
||||
PTR_ERR(reply));
|
||||
}
|
||||
return 0;
|
||||
|
||||
err_flow_free:
|
||||
ovs_flow_free(flow, false);
|
||||
err_unlock_ovs:
|
||||
ovs_unlock();
|
||||
err_kfree:
|
||||
kfree(acts);
|
||||
error:
|
||||
return error;
|
||||
}
|
||||
|
||||
static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
|
||||
{
|
||||
struct nlattr **a = info->attrs;
|
||||
struct ovs_header *ovs_header = info->userhdr;
|
||||
struct sw_flow_key key, masked_key;
|
||||
struct sw_flow *flow;
|
||||
struct sw_flow_mask mask;
|
||||
struct sk_buff *reply = NULL;
|
||||
struct datapath *dp;
|
||||
struct sw_flow_actions *acts = NULL;
|
||||
struct sw_flow_match match;
|
||||
int error;
|
||||
@ -830,10 +944,6 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
|
||||
OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
|
||||
goto err_kfree;
|
||||
}
|
||||
} else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
|
||||
/* OVS_FLOW_CMD_NEW must have actions. */
|
||||
error = -EINVAL;
|
||||
goto error;
|
||||
}
|
||||
|
||||
ovs_lock();
|
||||
@ -842,67 +952,31 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
|
||||
if (!dp)
|
||||
goto err_unlock_ovs;
|
||||
|
||||
/* Check if this is a duplicate flow */
|
||||
/* Check that the flow exists. */
|
||||
flow = ovs_flow_tbl_lookup(&dp->table, &key);
|
||||
if (!flow) {
|
||||
/* Bail out if we're not allowed to create a new flow. */
|
||||
error = -ENOENT;
|
||||
if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
|
||||
goto err_unlock_ovs;
|
||||
error = -ENOENT;
|
||||
if (!flow)
|
||||
goto err_unlock_ovs;
|
||||
|
||||
/* Allocate flow. */
|
||||
flow = ovs_flow_alloc();
|
||||
if (IS_ERR(flow)) {
|
||||
error = PTR_ERR(flow);
|
||||
goto err_unlock_ovs;
|
||||
}
|
||||
/* The unmasked key has to be the same for flow updates. */
|
||||
error = -EEXIST;
|
||||
if (!ovs_flow_cmp_unmasked_key(flow, &match))
|
||||
goto err_unlock_ovs;
|
||||
|
||||
flow->key = masked_key;
|
||||
flow->unmasked_key = key;
|
||||
/* Update actions, if present. */
|
||||
if (acts) {
|
||||
struct sw_flow_actions *old_acts;
|
||||
|
||||
old_acts = ovsl_dereference(flow->sf_acts);
|
||||
rcu_assign_pointer(flow->sf_acts, acts);
|
||||
|
||||
/* Put flow in bucket. */
|
||||
error = ovs_flow_tbl_insert(&dp->table, flow, &mask);
|
||||
if (error) {
|
||||
acts = NULL;
|
||||
goto err_flow_free;
|
||||
}
|
||||
|
||||
reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
|
||||
info, OVS_FLOW_CMD_NEW, false);
|
||||
} else {
|
||||
/* We found a matching flow. */
|
||||
/* Bail out if we're not allowed to modify an existing flow.
|
||||
* We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
|
||||
* because Generic Netlink treats the latter as a dump
|
||||
* request. We also accept NLM_F_EXCL in case that bug ever
|
||||
* gets fixed.
|
||||
*/
|
||||
error = -EEXIST;
|
||||
if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
|
||||
info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
|
||||
goto err_unlock_ovs;
|
||||
|
||||
/* The unmasked key has to be the same for flow updates. */
|
||||
if (!ovs_flow_cmp_unmasked_key(flow, &match))
|
||||
goto err_unlock_ovs;
|
||||
|
||||
/* Update actions, if present. */
|
||||
if (acts) {
|
||||
struct sw_flow_actions *old_acts;
|
||||
|
||||
old_acts = ovsl_dereference(flow->sf_acts);
|
||||
rcu_assign_pointer(flow->sf_acts, acts);
|
||||
ovs_nla_free_flow_actions(old_acts);
|
||||
}
|
||||
|
||||
reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
|
||||
info, OVS_FLOW_CMD_NEW, false);
|
||||
|
||||
/* Clear stats. */
|
||||
if (a[OVS_FLOW_ATTR_CLEAR])
|
||||
ovs_flow_stats_clear(flow);
|
||||
ovs_nla_free_flow_actions(old_acts);
|
||||
}
|
||||
|
||||
reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
|
||||
info, OVS_FLOW_CMD_NEW, false);
|
||||
/* Clear stats. */
|
||||
if (a[OVS_FLOW_ATTR_CLEAR])
|
||||
ovs_flow_stats_clear(flow);
|
||||
ovs_unlock();
|
||||
|
||||
if (reply) {
|
||||
@ -915,8 +989,6 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
|
||||
|
||||
return 0;
|
||||
|
||||
err_flow_free:
|
||||
ovs_flow_free(flow, false);
|
||||
err_unlock_ovs:
|
||||
ovs_unlock();
|
||||
err_kfree:
|
||||
@ -1078,7 +1150,7 @@ static const struct genl_ops dp_flow_genl_ops[] = {
|
||||
{ .cmd = OVS_FLOW_CMD_NEW,
|
||||
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
|
||||
.policy = flow_policy,
|
||||
.doit = ovs_flow_cmd_new_or_set
|
||||
.doit = ovs_flow_cmd_new
|
||||
},
|
||||
{ .cmd = OVS_FLOW_CMD_DEL,
|
||||
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
|
||||
@ -1094,7 +1166,7 @@ static const struct genl_ops dp_flow_genl_ops[] = {
|
||||
{ .cmd = OVS_FLOW_CMD_SET,
|
||||
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
|
||||
.policy = flow_policy,
|
||||
.doit = ovs_flow_cmd_new_or_set,
|
||||
.doit = ovs_flow_cmd_set,
|
||||
},
|
||||
};
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user