2015-05-12 20:56:15 +08:00
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#include <linux/kernel.h>
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2011-11-28 13:22:18 +08:00
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#include <linux/skbuff.h>
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2012-01-25 05:03:33 +08:00
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#include <linux/export.h>
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2011-11-28 13:22:18 +08:00
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/if_vlan.h>
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#include <net/ip.h>
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2012-07-18 16:11:12 +08:00
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#include <net/ipv6.h>
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2013-03-19 14:39:30 +08:00
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#include <linux/igmp.h>
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#include <linux/icmp.h>
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#include <linux/sctp.h>
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#include <linux/dccp.h>
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2011-11-28 13:22:18 +08:00
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#include <linux/if_tunnel.h>
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#include <linux/if_pppox.h>
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#include <linux/ppp_defs.h>
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2015-05-12 20:56:16 +08:00
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#include <linux/stddef.h>
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2015-05-12 20:56:07 +08:00
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#include <net/flow_dissector.h>
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2014-09-06 07:20:26 +08:00
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#include <scsi/fc/fc_fcoe.h>
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2011-11-28 13:22:18 +08:00
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2015-05-12 20:56:15 +08:00
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static bool skb_flow_dissector_uses_key(struct flow_dissector *flow_dissector,
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enum flow_dissector_key_id key_id)
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{
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return flow_dissector->used_keys & (1 << key_id);
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}
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static void skb_flow_dissector_set_key(struct flow_dissector *flow_dissector,
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enum flow_dissector_key_id key_id)
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{
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flow_dissector->used_keys |= (1 << key_id);
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}
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static void *skb_flow_dissector_target(struct flow_dissector *flow_dissector,
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enum flow_dissector_key_id key_id,
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void *target_container)
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{
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return ((char *) target_container) + flow_dissector->offset[key_id];
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}
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void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
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const struct flow_dissector_key *key,
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unsigned int key_count)
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{
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unsigned int i;
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memset(flow_dissector, 0, sizeof(*flow_dissector));
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for (i = 0; i < key_count; i++, key++) {
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/* User should make sure that every key target offset is withing
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* boundaries of unsigned short.
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*/
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BUG_ON(key->offset > USHRT_MAX);
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BUG_ON(skb_flow_dissector_uses_key(flow_dissector,
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key->key_id));
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skb_flow_dissector_set_key(flow_dissector, key->key_id);
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flow_dissector->offset[key->key_id] = key->offset;
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}
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/* Ensure that the dissector always includes basic key. That way
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* we are able to avoid handling lack of it in fast path.
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*/
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BUG_ON(!skb_flow_dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_BASIC));
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}
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EXPORT_SYMBOL(skb_flow_dissector_init);
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2013-10-02 19:39:24 +08:00
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/**
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2014-08-26 08:03:46 +08:00
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* __skb_flow_get_ports - extract the upper layer ports and return them
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* @skb: sk_buff to extract the ports from
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2013-10-02 19:39:24 +08:00
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* @thoff: transport header offset
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* @ip_proto: protocol for which to get port offset
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2014-08-26 08:03:46 +08:00
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* @data: raw buffer pointer to the packet, if NULL use skb->data
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* @hlen: packet header length, if @data is NULL use skb_headlen(skb)
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2013-10-02 19:39:24 +08:00
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*
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* The function will try to retrieve the ports at offset thoff + poff where poff
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* is the protocol port offset returned from proto_ports_offset
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*/
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2014-08-24 03:13:41 +08:00
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__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
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void *data, int hlen)
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2013-10-02 19:39:24 +08:00
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{
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int poff = proto_ports_offset(ip_proto);
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2014-08-24 03:13:41 +08:00
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if (!data) {
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data = skb->data;
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hlen = skb_headlen(skb);
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}
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2013-10-02 19:39:24 +08:00
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if (poff >= 0) {
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__be32 *ports, _ports;
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2014-08-24 03:13:41 +08:00
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ports = __skb_header_pointer(skb, thoff + poff,
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sizeof(_ports), data, hlen, &_ports);
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2013-10-02 19:39:24 +08:00
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if (ports)
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return *ports;
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}
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return 0;
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}
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2014-08-24 03:13:41 +08:00
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EXPORT_SYMBOL(__skb_flow_get_ports);
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2013-10-02 19:39:24 +08:00
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2014-08-26 08:03:47 +08:00
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/**
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* __skb_flow_dissect - extract the flow_keys struct and return it
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* @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
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2015-05-12 20:56:16 +08:00
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* @flow_dissector: list of keys to dissect
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* @target_container: target structure to put dissected values into
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2014-08-26 08:03:47 +08:00
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* @data: raw buffer pointer to the packet, if NULL use skb->data
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* @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
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* @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
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* @hlen: packet header length, if @data is NULL use skb_headlen(skb)
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*
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2015-05-12 20:56:16 +08:00
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* The function will try to retrieve individual keys into target specified
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* by flow_dissector from either the skbuff or a raw buffer specified by the
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* rest parameters.
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*
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* Caller must take care of zeroing target container memory.
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2014-08-26 08:03:47 +08:00
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*/
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2015-05-12 20:56:16 +08:00
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bool __skb_flow_dissect(const struct sk_buff *skb,
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struct flow_dissector *flow_dissector,
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void *target_container,
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2014-08-26 08:03:47 +08:00
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void *data, __be16 proto, int nhoff, int hlen)
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2011-11-28 13:22:18 +08:00
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{
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2015-05-12 20:56:16 +08:00
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struct flow_dissector_key_basic *key_basic;
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struct flow_dissector_key_addrs *key_addrs;
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struct flow_dissector_key_ports *key_ports;
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2011-11-28 13:22:18 +08:00
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u8 ip_proto;
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2014-08-24 03:13:41 +08:00
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if (!data) {
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data = skb->data;
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2014-08-26 08:03:47 +08:00
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proto = skb->protocol;
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nhoff = skb_network_offset(skb);
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2014-08-24 03:13:41 +08:00
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hlen = skb_headlen(skb);
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}
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2015-05-12 20:56:16 +08:00
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/* It is ensured by skb_flow_dissector_init() that basic key will
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* be always present.
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*/
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key_basic = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_BASIC,
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target_container);
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2011-11-28 13:22:18 +08:00
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again:
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switch (proto) {
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2014-03-13 01:04:17 +08:00
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case htons(ETH_P_IP): {
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2011-11-28 13:22:18 +08:00
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const struct iphdr *iph;
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struct iphdr _iph;
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ip:
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2014-08-24 03:13:41 +08:00
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iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
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2013-11-01 15:01:10 +08:00
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if (!iph || iph->ihl < 5)
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2011-11-28 13:22:18 +08:00
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return false;
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2013-11-08 00:37:28 +08:00
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nhoff += iph->ihl * 4;
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2011-11-28 13:22:18 +08:00
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2013-11-08 00:37:28 +08:00
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ip_proto = iph->protocol;
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2011-11-28 13:22:18 +08:00
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if (ip_is_fragment(iph))
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ip_proto = 0;
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2013-11-08 00:37:28 +08:00
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2015-05-12 20:56:16 +08:00
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if (!skb_flow_dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_IPV4_ADDRS))
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2014-10-11 03:09:12 +08:00
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break;
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2015-05-12 20:56:16 +08:00
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key_addrs = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_IPV4_ADDRS,
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target_container);
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memcpy(key_addrs, &iph->saddr, sizeof(*key_addrs));
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2011-11-28 13:22:18 +08:00
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break;
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}
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2014-03-13 01:04:17 +08:00
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case htons(ETH_P_IPV6): {
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2011-11-28 13:22:18 +08:00
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const struct ipv6hdr *iph;
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struct ipv6hdr _iph;
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2014-07-02 12:33:01 +08:00
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__be32 flow_label;
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2011-11-28 13:22:18 +08:00
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ipv6:
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2014-08-24 03:13:41 +08:00
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iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
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2011-11-28 13:22:18 +08:00
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if (!iph)
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return false;
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ip_proto = iph->nexthdr;
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nhoff += sizeof(struct ipv6hdr);
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2014-07-02 12:33:01 +08:00
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2015-05-12 20:56:18 +08:00
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if (skb_flow_dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS)) {
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key_addrs = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS,
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target_container);
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2014-09-06 07:20:26 +08:00
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2015-05-12 20:56:18 +08:00
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key_addrs->src = (__force __be32)ipv6_addr_hash(&iph->saddr);
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key_addrs->dst = (__force __be32)ipv6_addr_hash(&iph->daddr);
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goto flow_label;
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}
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if (skb_flow_dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
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struct flow_dissector_key_ipv6_addrs *key_ipv6_addrs;
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key_ipv6_addrs = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_IPV6_ADDRS,
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target_container);
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2014-10-11 03:09:12 +08:00
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2015-05-12 20:56:18 +08:00
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memcpy(key_ipv6_addrs, &iph->saddr, sizeof(*key_ipv6_addrs));
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goto flow_label;
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}
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break;
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flow_label:
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2014-07-02 12:33:01 +08:00
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flow_label = ip6_flowlabel(iph);
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if (flow_label) {
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/* Awesome, IPv6 packet has a flow label so we can
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* use that to represent the ports without any
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* further dissection.
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*/
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2015-05-12 20:56:16 +08:00
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key_basic->n_proto = proto;
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key_basic->ip_proto = ip_proto;
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key_basic->thoff = (u16)nhoff;
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if (!skb_flow_dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_PORTS))
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break;
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key_ports = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_PORTS,
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target_container);
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key_ports->ports = flow_label;
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2014-07-02 12:33:01 +08:00
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return true;
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}
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2011-11-28 13:22:18 +08:00
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break;
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}
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2014-03-13 01:04:17 +08:00
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case htons(ETH_P_8021AD):
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case htons(ETH_P_8021Q): {
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2011-11-28 13:22:18 +08:00
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const struct vlan_hdr *vlan;
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struct vlan_hdr _vlan;
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2014-08-24 03:13:41 +08:00
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vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan), data, hlen, &_vlan);
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2011-11-28 13:22:18 +08:00
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if (!vlan)
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return false;
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proto = vlan->h_vlan_encapsulated_proto;
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nhoff += sizeof(*vlan);
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goto again;
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}
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2014-03-13 01:04:17 +08:00
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case htons(ETH_P_PPP_SES): {
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2011-11-28 13:22:18 +08:00
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struct {
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struct pppoe_hdr hdr;
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__be16 proto;
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} *hdr, _hdr;
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2014-08-24 03:13:41 +08:00
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hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
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2011-11-28 13:22:18 +08:00
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if (!hdr)
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return false;
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proto = hdr->proto;
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nhoff += PPPOE_SES_HLEN;
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switch (proto) {
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2014-03-13 01:04:17 +08:00
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case htons(PPP_IP):
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2011-11-28 13:22:18 +08:00
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goto ip;
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2014-03-13 01:04:17 +08:00
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case htons(PPP_IPV6):
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2011-11-28 13:22:18 +08:00
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goto ipv6;
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default:
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return false;
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}
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}
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2015-01-23 00:10:32 +08:00
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case htons(ETH_P_TIPC): {
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struct {
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__be32 pre[3];
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__be32 srcnode;
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} *hdr, _hdr;
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hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
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if (!hdr)
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return false;
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2015-05-12 20:56:16 +08:00
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key_basic->n_proto = proto;
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key_basic->thoff = (u16)nhoff;
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if (skb_flow_dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS)) {
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return true;
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key_addrs = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS,
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target_container);
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key_addrs->src = hdr->srcnode;
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key_addrs->dst = 0;
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}
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2015-01-23 00:10:32 +08:00
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return true;
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}
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2014-09-06 07:20:26 +08:00
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case htons(ETH_P_FCOE):
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2015-05-12 20:56:16 +08:00
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key_basic->thoff = (u16)(nhoff + FCOE_HEADER_LEN);
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2014-09-06 07:20:26 +08:00
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/* fall through */
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2011-11-28 13:22:18 +08:00
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default:
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return false;
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}
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switch (ip_proto) {
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case IPPROTO_GRE: {
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struct gre_hdr {
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__be16 flags;
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__be16 proto;
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} *hdr, _hdr;
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|
2014-08-24 03:13:41 +08:00
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hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
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2011-11-28 13:22:18 +08:00
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if (!hdr)
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return false;
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/*
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* Only look inside GRE if version zero and no
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* routing
|
|
|
|
*/
|
|
|
|
if (!(hdr->flags & (GRE_VERSION|GRE_ROUTING))) {
|
|
|
|
proto = hdr->proto;
|
|
|
|
nhoff += 4;
|
|
|
|
if (hdr->flags & GRE_CSUM)
|
|
|
|
nhoff += 4;
|
|
|
|
if (hdr->flags & GRE_KEY)
|
|
|
|
nhoff += 4;
|
|
|
|
if (hdr->flags & GRE_SEQ)
|
|
|
|
nhoff += 4;
|
2013-03-11 14:52:28 +08:00
|
|
|
if (proto == htons(ETH_P_TEB)) {
|
|
|
|
const struct ethhdr *eth;
|
|
|
|
struct ethhdr _eth;
|
|
|
|
|
2014-08-24 03:13:41 +08:00
|
|
|
eth = __skb_header_pointer(skb, nhoff,
|
|
|
|
sizeof(_eth),
|
|
|
|
data, hlen, &_eth);
|
2013-03-11 14:52:28 +08:00
|
|
|
if (!eth)
|
|
|
|
return false;
|
|
|
|
proto = eth->h_proto;
|
|
|
|
nhoff += sizeof(*eth);
|
|
|
|
}
|
2011-11-28 13:22:18 +08:00
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
case IPPROTO_IPIP:
|
2013-07-30 02:07:36 +08:00
|
|
|
proto = htons(ETH_P_IP);
|
|
|
|
goto ip;
|
2013-07-30 02:07:42 +08:00
|
|
|
case IPPROTO_IPV6:
|
|
|
|
proto = htons(ETH_P_IPV6);
|
|
|
|
goto ipv6;
|
2011-11-28 13:22:18 +08:00
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2015-05-12 20:56:16 +08:00
|
|
|
/* It is ensured by skb_flow_dissector_init() that basic key will
|
|
|
|
* be always present.
|
|
|
|
*/
|
|
|
|
key_basic = skb_flow_dissector_target(flow_dissector,
|
|
|
|
FLOW_DISSECTOR_KEY_BASIC,
|
|
|
|
target_container);
|
|
|
|
key_basic->n_proto = proto;
|
|
|
|
key_basic->ip_proto = ip_proto;
|
|
|
|
key_basic->thoff = (u16) nhoff;
|
|
|
|
|
|
|
|
if (skb_flow_dissector_uses_key(flow_dissector,
|
|
|
|
FLOW_DISSECTOR_KEY_PORTS)) {
|
|
|
|
key_ports = skb_flow_dissector_target(flow_dissector,
|
|
|
|
FLOW_DISSECTOR_KEY_PORTS,
|
|
|
|
target_container);
|
|
|
|
key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
|
|
|
|
data, hlen);
|
|
|
|
}
|
2014-10-11 03:09:12 +08:00
|
|
|
|
2011-11-28 13:22:18 +08:00
|
|
|
return true;
|
|
|
|
}
|
2014-08-24 03:13:41 +08:00
|
|
|
EXPORT_SYMBOL(__skb_flow_dissect);
|
2013-01-21 08:39:24 +08:00
|
|
|
|
|
|
|
static u32 hashrnd __read_mostly;
|
2013-10-24 02:06:00 +08:00
|
|
|
static __always_inline void __flow_hash_secret_init(void)
|
|
|
|
{
|
|
|
|
net_get_random_once(&hashrnd, sizeof(hashrnd));
|
|
|
|
}
|
|
|
|
|
2015-05-02 02:30:12 +08:00
|
|
|
static __always_inline u32 __flow_hash_3words(u32 a, u32 b, u32 c, u32 keyval)
|
2013-10-24 02:06:00 +08:00
|
|
|
{
|
2015-05-02 02:30:12 +08:00
|
|
|
return jhash_3words(a, b, c, keyval);
|
2013-10-24 02:06:00 +08:00
|
|
|
}
|
|
|
|
|
2015-05-02 02:30:12 +08:00
|
|
|
static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval)
|
2014-07-02 12:32:05 +08:00
|
|
|
{
|
|
|
|
u32 hash;
|
|
|
|
|
|
|
|
/* get a consistent hash (same value on both flow directions) */
|
2015-05-12 20:56:16 +08:00
|
|
|
if (((__force u32)keys->addrs.dst < (__force u32)keys->addrs.src) ||
|
|
|
|
(((__force u32)keys->addrs.dst == (__force u32)keys->addrs.src) &&
|
|
|
|
((__force u16)keys->ports.port16[1] < (__force u16)keys->ports.port16[0]))) {
|
|
|
|
swap(keys->addrs.dst, keys->addrs.src);
|
|
|
|
swap(keys->ports.port16[0], keys->ports.port16[1]);
|
2014-07-02 12:32:05 +08:00
|
|
|
}
|
|
|
|
|
2015-05-12 20:56:16 +08:00
|
|
|
hash = __flow_hash_3words((__force u32)keys->addrs.dst,
|
|
|
|
(__force u32)keys->addrs.src,
|
|
|
|
(__force u32)keys->ports.ports,
|
2015-05-02 02:30:12 +08:00
|
|
|
keyval);
|
2014-07-02 12:32:05 +08:00
|
|
|
if (!hash)
|
|
|
|
hash = 1;
|
|
|
|
|
|
|
|
return hash;
|
|
|
|
}
|
|
|
|
|
|
|
|
u32 flow_hash_from_keys(struct flow_keys *keys)
|
|
|
|
{
|
2015-05-02 02:30:12 +08:00
|
|
|
__flow_hash_secret_init();
|
|
|
|
return __flow_hash_from_keys(keys, hashrnd);
|
2014-07-02 12:32:05 +08:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(flow_hash_from_keys);
|
|
|
|
|
2015-05-02 02:30:12 +08:00
|
|
|
static inline u32 ___skb_get_hash(const struct sk_buff *skb,
|
|
|
|
struct flow_keys *keys, u32 keyval)
|
|
|
|
{
|
2015-05-12 20:56:16 +08:00
|
|
|
if (!skb_flow_dissect_flow_keys(skb, keys))
|
2015-05-02 02:30:12 +08:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
return __flow_hash_from_keys(keys, keyval);
|
|
|
|
}
|
|
|
|
|
2015-05-02 02:30:17 +08:00
|
|
|
struct _flow_keys_digest_data {
|
|
|
|
__be16 n_proto;
|
|
|
|
u8 ip_proto;
|
|
|
|
u8 padding;
|
|
|
|
__be32 ports;
|
|
|
|
__be32 src;
|
|
|
|
__be32 dst;
|
|
|
|
};
|
|
|
|
|
|
|
|
void make_flow_keys_digest(struct flow_keys_digest *digest,
|
|
|
|
const struct flow_keys *flow)
|
|
|
|
{
|
|
|
|
struct _flow_keys_digest_data *data =
|
|
|
|
(struct _flow_keys_digest_data *)digest;
|
|
|
|
|
|
|
|
BUILD_BUG_ON(sizeof(*data) > sizeof(*digest));
|
|
|
|
|
|
|
|
memset(digest, 0, sizeof(*digest));
|
|
|
|
|
2015-05-12 20:56:16 +08:00
|
|
|
data->n_proto = flow->basic.n_proto;
|
|
|
|
data->ip_proto = flow->basic.ip_proto;
|
|
|
|
data->ports = flow->ports.ports;
|
|
|
|
data->src = flow->addrs.src;
|
|
|
|
data->dst = flow->addrs.dst;
|
2015-05-02 02:30:17 +08:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(make_flow_keys_digest);
|
|
|
|
|
2015-05-12 20:56:10 +08:00
|
|
|
/**
|
|
|
|
* __skb_get_hash: calculate a flow hash
|
|
|
|
* @skb: sk_buff to calculate flow hash from
|
|
|
|
*
|
|
|
|
* This function calculates a flow hash based on src/dst addresses
|
2014-03-25 06:34:47 +08:00
|
|
|
* and src/dst port numbers. Sets hash in skb to non-zero hash value
|
|
|
|
* on success, zero indicates no valid hash. Also, sets l4_hash in skb
|
2013-01-21 08:39:24 +08:00
|
|
|
* if hash is a canonical 4-tuple hash over transport ports.
|
|
|
|
*/
|
2013-12-16 14:12:06 +08:00
|
|
|
void __skb_get_hash(struct sk_buff *skb)
|
2013-01-21 08:39:24 +08:00
|
|
|
{
|
|
|
|
struct flow_keys keys;
|
2015-05-02 02:30:12 +08:00
|
|
|
u32 hash;
|
2013-01-21 08:39:24 +08:00
|
|
|
|
2015-05-02 02:30:12 +08:00
|
|
|
__flow_hash_secret_init();
|
|
|
|
|
|
|
|
hash = ___skb_get_hash(skb, &keys, hashrnd);
|
|
|
|
if (!hash)
|
2013-01-21 08:39:24 +08:00
|
|
|
return;
|
2015-05-12 20:56:16 +08:00
|
|
|
if (keys.ports.ports)
|
2014-03-25 06:34:47 +08:00
|
|
|
skb->l4_hash = 1;
|
2014-07-02 12:33:17 +08:00
|
|
|
skb->sw_hash = 1;
|
2015-05-02 02:30:12 +08:00
|
|
|
skb->hash = hash;
|
2013-01-21 08:39:24 +08:00
|
|
|
}
|
2013-12-16 14:12:06 +08:00
|
|
|
EXPORT_SYMBOL(__skb_get_hash);
|
2013-01-21 08:39:24 +08:00
|
|
|
|
2015-05-02 02:30:12 +08:00
|
|
|
__u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb)
|
|
|
|
{
|
|
|
|
struct flow_keys keys;
|
|
|
|
|
|
|
|
return ___skb_get_hash(skb, &keys, perturb);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(skb_get_hash_perturb);
|
|
|
|
|
2014-09-06 07:20:26 +08:00
|
|
|
u32 __skb_get_poff(const struct sk_buff *skb, void *data,
|
|
|
|
const struct flow_keys *keys, int hlen)
|
2013-03-19 14:39:30 +08:00
|
|
|
{
|
2015-05-12 20:56:16 +08:00
|
|
|
u32 poff = keys->basic.thoff;
|
2013-03-19 14:39:30 +08:00
|
|
|
|
2015-05-12 20:56:16 +08:00
|
|
|
switch (keys->basic.ip_proto) {
|
2013-03-19 14:39:30 +08:00
|
|
|
case IPPROTO_TCP: {
|
2014-10-11 03:09:12 +08:00
|
|
|
/* access doff as u8 to avoid unaligned access */
|
|
|
|
const u8 *doff;
|
|
|
|
u8 _doff;
|
2013-03-19 14:39:30 +08:00
|
|
|
|
2014-10-11 03:09:12 +08:00
|
|
|
doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
|
|
|
|
data, hlen, &_doff);
|
|
|
|
if (!doff)
|
2013-03-19 14:39:30 +08:00
|
|
|
return poff;
|
|
|
|
|
2014-10-11 03:09:12 +08:00
|
|
|
poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
|
2013-03-19 14:39:30 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
case IPPROTO_UDP:
|
|
|
|
case IPPROTO_UDPLITE:
|
|
|
|
poff += sizeof(struct udphdr);
|
|
|
|
break;
|
|
|
|
/* For the rest, we do not really care about header
|
|
|
|
* extensions at this point for now.
|
|
|
|
*/
|
|
|
|
case IPPROTO_ICMP:
|
|
|
|
poff += sizeof(struct icmphdr);
|
|
|
|
break;
|
|
|
|
case IPPROTO_ICMPV6:
|
|
|
|
poff += sizeof(struct icmp6hdr);
|
|
|
|
break;
|
|
|
|
case IPPROTO_IGMP:
|
|
|
|
poff += sizeof(struct igmphdr);
|
|
|
|
break;
|
|
|
|
case IPPROTO_DCCP:
|
|
|
|
poff += sizeof(struct dccp_hdr);
|
|
|
|
break;
|
|
|
|
case IPPROTO_SCTP:
|
|
|
|
poff += sizeof(struct sctphdr);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return poff;
|
|
|
|
}
|
|
|
|
|
2015-05-12 20:56:14 +08:00
|
|
|
/**
|
|
|
|
* skb_get_poff - get the offset to the payload
|
|
|
|
* @skb: sk_buff to get the payload offset from
|
|
|
|
*
|
|
|
|
* The function will get the offset to the payload as far as it could
|
|
|
|
* be dissected. The main user is currently BPF, so that we can dynamically
|
2014-09-06 07:20:26 +08:00
|
|
|
* truncate packets without needing to push actual payload to the user
|
|
|
|
* space and can analyze headers only, instead.
|
|
|
|
*/
|
|
|
|
u32 skb_get_poff(const struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
struct flow_keys keys;
|
|
|
|
|
2015-05-12 20:56:16 +08:00
|
|
|
if (!skb_flow_dissect_flow_keys(skb, &keys))
|
2014-09-06 07:20:26 +08:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
|
|
|
|
}
|
2015-05-12 20:56:16 +08:00
|
|
|
|
|
|
|
static const struct flow_dissector_key flow_keys_dissector_keys[] = {
|
|
|
|
{
|
|
|
|
.key_id = FLOW_DISSECTOR_KEY_BASIC,
|
|
|
|
.offset = offsetof(struct flow_keys, basic),
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
|
|
|
|
.offset = offsetof(struct flow_keys, addrs),
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.key_id = FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS,
|
|
|
|
.offset = offsetof(struct flow_keys, addrs),
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.key_id = FLOW_DISSECTOR_KEY_PORTS,
|
|
|
|
.offset = offsetof(struct flow_keys, ports),
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = {
|
|
|
|
{
|
|
|
|
.key_id = FLOW_DISSECTOR_KEY_BASIC,
|
|
|
|
.offset = offsetof(struct flow_keys, basic),
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
struct flow_dissector flow_keys_dissector __read_mostly;
|
|
|
|
EXPORT_SYMBOL(flow_keys_dissector);
|
|
|
|
|
|
|
|
struct flow_dissector flow_keys_buf_dissector __read_mostly;
|
|
|
|
|
|
|
|
static int __init init_default_flow_dissectors(void)
|
|
|
|
{
|
|
|
|
skb_flow_dissector_init(&flow_keys_dissector,
|
|
|
|
flow_keys_dissector_keys,
|
|
|
|
ARRAY_SIZE(flow_keys_dissector_keys));
|
|
|
|
skb_flow_dissector_init(&flow_keys_buf_dissector,
|
|
|
|
flow_keys_buf_dissector_keys,
|
|
|
|
ARRAY_SIZE(flow_keys_buf_dissector_keys));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
late_initcall_sync(init_default_flow_dissectors);
|