net/openvswitch/flow_netlink.c

Source file repositories/reference/linux-study-clean/net/openvswitch/flow_netlink.c

File Facts

System
Linux kernel
Corpus path
net/openvswitch/flow_netlink.c
Extension
.c
Size
102909 bytes
Lines
3804
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

struct ovs_len_tbl {
	int len;
	const struct ovs_len_tbl *next;
};

#define OVS_ATTR_NESTED -1
#define OVS_ATTR_VARIABLE -2
#define OVS_COPY_ACTIONS_MAX_DEPTH 16

static bool actions_may_change_flow(const struct nlattr *actions)
{
	struct nlattr *nla;
	int rem;

	nla_for_each_nested(nla, actions, rem) {
		u16 action = nla_type(nla);

		switch (action) {
		case OVS_ACTION_ATTR_OUTPUT:
		case OVS_ACTION_ATTR_RECIRC:
		case OVS_ACTION_ATTR_TRUNC:
		case OVS_ACTION_ATTR_USERSPACE:
		case OVS_ACTION_ATTR_DROP:
		case OVS_ACTION_ATTR_PSAMPLE:
			break;

		case OVS_ACTION_ATTR_CT:
		case OVS_ACTION_ATTR_CT_CLEAR:
		case OVS_ACTION_ATTR_HASH:
		case OVS_ACTION_ATTR_POP_ETH:
		case OVS_ACTION_ATTR_POP_MPLS:
		case OVS_ACTION_ATTR_POP_NSH:
		case OVS_ACTION_ATTR_POP_VLAN:
		case OVS_ACTION_ATTR_PUSH_ETH:
		case OVS_ACTION_ATTR_PUSH_MPLS:
		case OVS_ACTION_ATTR_PUSH_NSH:
		case OVS_ACTION_ATTR_PUSH_VLAN:
		case OVS_ACTION_ATTR_SAMPLE:
		case OVS_ACTION_ATTR_SET:
		case OVS_ACTION_ATTR_SET_MASKED:
		case OVS_ACTION_ATTR_METER:
		case OVS_ACTION_ATTR_CHECK_PKT_LEN:
		case OVS_ACTION_ATTR_ADD_MPLS:
		case OVS_ACTION_ATTR_DEC_TTL:
		default:
			return true;
		}
	}
	return false;
}

static void update_range(struct sw_flow_match *match,
			 size_t offset, size_t size, bool is_mask)
{
	struct sw_flow_key_range *range;
	size_t start = rounddown(offset, sizeof(long));
	size_t end = roundup(offset + size, sizeof(long));

	if (!is_mask)
		range = &match->range;
	else
		range = &match->mask->range;

	if (range->start == range->end) {
		range->start = start;
		range->end = end;
		return;
	}

	if (range->start > start)
		range->start = start;

	if (range->end < end)
		range->end = end;
}

#define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
	do { \
		update_range(match, offsetof(struct sw_flow_key, field),    \
			     sizeof((match)->key->field), is_mask);	    \
		if (is_mask)						    \
			(match)->mask->key.field = value;		    \
		else							    \
			(match)->key->field = value;		            \
	} while (0)

#define SW_FLOW_KEY_MEMCPY_OFFSET(match, offset, value_p, len, is_mask)	    \
	do {								    \
		update_range(match, offset, len, is_mask);		    \
		if (is_mask)						    \

Annotation

Implementation Notes