![Amir Vadai](/assets/img/avatar_default.png)
Will be used in a following patch to query if a key is being used, and what it's value in the target object. Acked-by: John Fastabend <john.r.fastabend@intel.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Amir Vadai <amir@vadai.me> Signed-off-by: David S. Miller <davem@davemloft.net>
899 lines
23 KiB
C
899 lines
23 KiB
C
#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/export.h>
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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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#include <net/ipv6.h>
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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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#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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#include <linux/stddef.h>
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#include <linux/if_ether.h>
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#include <linux/mpls.h>
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#include <net/flow_dissector.h>
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#include <scsi/fc/fc_fcoe.h>
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static void 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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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(dissector_uses_key(flow_dissector,
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key->key_id));
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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 control and basic key.
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* That way we are able to avoid handling lack of these in fast path.
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*/
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BUG_ON(!dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_CONTROL));
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BUG_ON(!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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/**
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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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* @thoff: transport header offset
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* @ip_proto: protocol for which to get port offset
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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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*
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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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__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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{
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int poff = proto_ports_offset(ip_proto);
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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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if (poff >= 0) {
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__be32 *ports, _ports;
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ports = __skb_header_pointer(skb, thoff + poff,
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sizeof(_ports), data, hlen, &_ports);
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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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EXPORT_SYMBOL(__skb_flow_get_ports);
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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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* @flow_dissector: list of keys to dissect
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* @target_container: target structure to put dissected values into
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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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* 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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*/
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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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void *data, __be16 proto, int nhoff, int hlen,
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unsigned int flags)
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{
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struct flow_dissector_key_control *key_control;
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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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struct flow_dissector_key_tags *key_tags;
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struct flow_dissector_key_keyid *key_keyid;
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u8 ip_proto = 0;
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bool ret = false;
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if (!data) {
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data = skb->data;
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proto = skb->protocol;
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nhoff = skb_network_offset(skb);
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hlen = skb_headlen(skb);
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}
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/* It is ensured by skb_flow_dissector_init() that control key will
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* be always present.
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*/
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key_control = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_CONTROL,
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target_container);
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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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if (dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
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struct ethhdr *eth = eth_hdr(skb);
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struct flow_dissector_key_eth_addrs *key_eth_addrs;
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key_eth_addrs = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_ETH_ADDRS,
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target_container);
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memcpy(key_eth_addrs, ð->h_dest, sizeof(*key_eth_addrs));
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}
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again:
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switch (proto) {
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case htons(ETH_P_IP): {
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const struct iphdr *iph;
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struct iphdr _iph;
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ip:
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iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
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if (!iph || iph->ihl < 5)
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goto out_bad;
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nhoff += iph->ihl * 4;
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ip_proto = iph->protocol;
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if (dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
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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->v4addrs, &iph->saddr,
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sizeof(key_addrs->v4addrs));
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key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
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}
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if (ip_is_fragment(iph)) {
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key_control->flags |= FLOW_DIS_IS_FRAGMENT;
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if (iph->frag_off & htons(IP_OFFSET)) {
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goto out_good;
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} else {
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key_control->flags |= FLOW_DIS_FIRST_FRAG;
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if (!(flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG))
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goto out_good;
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}
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}
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if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
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goto out_good;
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break;
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}
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case htons(ETH_P_IPV6): {
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const struct ipv6hdr *iph;
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struct ipv6hdr _iph;
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ipv6:
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iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
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if (!iph)
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goto out_bad;
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ip_proto = iph->nexthdr;
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nhoff += sizeof(struct ipv6hdr);
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if (dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
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key_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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memcpy(&key_addrs->v6addrs, &iph->saddr,
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sizeof(key_addrs->v6addrs));
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key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
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}
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if ((dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_FLOW_LABEL) ||
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(flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)) &&
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ip6_flowlabel(iph)) {
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__be32 flow_label = ip6_flowlabel(iph);
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if (dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_FLOW_LABEL)) {
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key_tags = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_FLOW_LABEL,
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target_container);
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key_tags->flow_label = ntohl(flow_label);
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}
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if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL)
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goto out_good;
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}
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if (flags & FLOW_DISSECTOR_F_STOP_AT_L3)
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goto out_good;
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break;
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}
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case htons(ETH_P_8021AD):
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case htons(ETH_P_8021Q): {
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const struct vlan_hdr *vlan;
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struct vlan_hdr _vlan;
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vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan), data, hlen, &_vlan);
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if (!vlan)
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goto out_bad;
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if (dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_VLANID)) {
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key_tags = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_VLANID,
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target_container);
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key_tags->vlan_id = skb_vlan_tag_get_id(skb);
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}
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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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case htons(ETH_P_PPP_SES): {
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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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hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
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if (!hdr)
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goto out_bad;
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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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case htons(PPP_IP):
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goto ip;
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case htons(PPP_IPV6):
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goto ipv6;
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default:
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goto out_bad;
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}
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}
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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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goto out_bad;
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if (dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_TIPC_ADDRS)) {
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key_addrs = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_TIPC_ADDRS,
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target_container);
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key_addrs->tipcaddrs.srcnode = hdr->srcnode;
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key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC_ADDRS;
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}
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goto out_good;
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}
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case htons(ETH_P_MPLS_UC):
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case htons(ETH_P_MPLS_MC): {
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struct mpls_label *hdr, _hdr[2];
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mpls:
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hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
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hlen, &_hdr);
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if (!hdr)
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goto out_bad;
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if ((ntohl(hdr[0].entry) & MPLS_LS_LABEL_MASK) >>
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MPLS_LS_LABEL_SHIFT == MPLS_LABEL_ENTROPY) {
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if (dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) {
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key_keyid = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
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target_container);
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key_keyid->keyid = hdr[1].entry &
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htonl(MPLS_LS_LABEL_MASK);
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}
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goto out_good;
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}
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goto out_good;
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}
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case htons(ETH_P_FCOE):
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if ((hlen - nhoff) < FCOE_HEADER_LEN)
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goto out_bad;
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nhoff += FCOE_HEADER_LEN;
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goto out_good;
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default:
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goto out_bad;
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}
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ip_proto_again:
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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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hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
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if (!hdr)
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goto out_bad;
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/*
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* Only look inside GRE if version zero and no
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* routing
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*/
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if (hdr->flags & (GRE_VERSION | GRE_ROUTING))
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break;
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proto = hdr->proto;
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nhoff += 4;
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if (hdr->flags & GRE_CSUM)
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nhoff += 4;
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if (hdr->flags & GRE_KEY) {
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const __be32 *keyid;
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__be32 _keyid;
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keyid = __skb_header_pointer(skb, nhoff, sizeof(_keyid),
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data, hlen, &_keyid);
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if (!keyid)
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goto out_bad;
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if (dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_GRE_KEYID)) {
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key_keyid = skb_flow_dissector_target(flow_dissector,
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FLOW_DISSECTOR_KEY_GRE_KEYID,
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target_container);
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key_keyid->keyid = *keyid;
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}
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nhoff += 4;
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}
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if (hdr->flags & GRE_SEQ)
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nhoff += 4;
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if (proto == htons(ETH_P_TEB)) {
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const struct ethhdr *eth;
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struct ethhdr _eth;
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eth = __skb_header_pointer(skb, nhoff,
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sizeof(_eth),
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data, hlen, &_eth);
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if (!eth)
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goto out_bad;
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proto = eth->h_proto;
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nhoff += sizeof(*eth);
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/* Cap headers that we access via pointers at the
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* end of the Ethernet header as our maximum alignment
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* at that point is only 2 bytes.
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*/
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if (NET_IP_ALIGN)
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hlen = nhoff;
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}
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key_control->flags |= FLOW_DIS_ENCAPSULATION;
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if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
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goto out_good;
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goto again;
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}
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case NEXTHDR_HOP:
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case NEXTHDR_ROUTING:
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case NEXTHDR_DEST: {
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u8 _opthdr[2], *opthdr;
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if (proto != htons(ETH_P_IPV6))
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break;
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opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
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data, hlen, &_opthdr);
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if (!opthdr)
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goto out_bad;
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ip_proto = opthdr[0];
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nhoff += (opthdr[1] + 1) << 3;
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goto ip_proto_again;
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}
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case NEXTHDR_FRAGMENT: {
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struct frag_hdr _fh, *fh;
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if (proto != htons(ETH_P_IPV6))
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break;
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fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
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data, hlen, &_fh);
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|
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if (!fh)
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goto out_bad;
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key_control->flags |= FLOW_DIS_IS_FRAGMENT;
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|
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nhoff += sizeof(_fh);
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ip_proto = fh->nexthdr;
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if (!(fh->frag_off & htons(IP6_OFFSET))) {
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key_control->flags |= FLOW_DIS_FIRST_FRAG;
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if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG)
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goto ip_proto_again;
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}
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goto out_good;
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}
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case IPPROTO_IPIP:
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proto = htons(ETH_P_IP);
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key_control->flags |= FLOW_DIS_ENCAPSULATION;
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if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
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goto out_good;
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goto ip;
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case IPPROTO_IPV6:
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proto = htons(ETH_P_IPV6);
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key_control->flags |= FLOW_DIS_ENCAPSULATION;
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if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP)
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goto out_good;
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goto ipv6;
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case IPPROTO_MPLS:
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proto = htons(ETH_P_MPLS_UC);
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goto mpls;
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default:
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break;
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}
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|
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if (dissector_uses_key(flow_dissector,
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FLOW_DISSECTOR_KEY_PORTS)) {
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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 = __skb_flow_get_ports(skb, nhoff, ip_proto,
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data, hlen);
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}
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out_good:
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ret = true;
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out_bad:
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key_basic->n_proto = proto;
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key_basic->ip_proto = ip_proto;
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key_control->thoff = (u16)nhoff;
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return ret;
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}
|
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EXPORT_SYMBOL(__skb_flow_dissect);
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|
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static u32 hashrnd __read_mostly;
|
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static __always_inline void __flow_hash_secret_init(void)
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{
|
|
net_get_random_once(&hashrnd, sizeof(hashrnd));
|
|
}
|
|
|
|
static __always_inline u32 __flow_hash_words(const u32 *words, u32 length,
|
|
u32 keyval)
|
|
{
|
|
return jhash2(words, length, keyval);
|
|
}
|
|
|
|
static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow)
|
|
{
|
|
const void *p = flow;
|
|
|
|
BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32));
|
|
return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET);
|
|
}
|
|
|
|
static inline size_t flow_keys_hash_length(const struct flow_keys *flow)
|
|
{
|
|
size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs);
|
|
BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32));
|
|
BUILD_BUG_ON(offsetof(typeof(*flow), addrs) !=
|
|
sizeof(*flow) - sizeof(flow->addrs));
|
|
|
|
switch (flow->control.addr_type) {
|
|
case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
|
|
diff -= sizeof(flow->addrs.v4addrs);
|
|
break;
|
|
case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
|
|
diff -= sizeof(flow->addrs.v6addrs);
|
|
break;
|
|
case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
|
|
diff -= sizeof(flow->addrs.tipcaddrs);
|
|
break;
|
|
}
|
|
return (sizeof(*flow) - diff) / sizeof(u32);
|
|
}
|
|
|
|
__be32 flow_get_u32_src(const struct flow_keys *flow)
|
|
{
|
|
switch (flow->control.addr_type) {
|
|
case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
|
|
return flow->addrs.v4addrs.src;
|
|
case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
|
|
return (__force __be32)ipv6_addr_hash(
|
|
&flow->addrs.v6addrs.src);
|
|
case FLOW_DISSECTOR_KEY_TIPC_ADDRS:
|
|
return flow->addrs.tipcaddrs.srcnode;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(flow_get_u32_src);
|
|
|
|
__be32 flow_get_u32_dst(const struct flow_keys *flow)
|
|
{
|
|
switch (flow->control.addr_type) {
|
|
case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
|
|
return flow->addrs.v4addrs.dst;
|
|
case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
|
|
return (__force __be32)ipv6_addr_hash(
|
|
&flow->addrs.v6addrs.dst);
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(flow_get_u32_dst);
|
|
|
|
static inline void __flow_hash_consistentify(struct flow_keys *keys)
|
|
{
|
|
int addr_diff, i;
|
|
|
|
switch (keys->control.addr_type) {
|
|
case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
|
|
addr_diff = (__force u32)keys->addrs.v4addrs.dst -
|
|
(__force u32)keys->addrs.v4addrs.src;
|
|
if ((addr_diff < 0) ||
|
|
(addr_diff == 0 &&
|
|
((__force u16)keys->ports.dst <
|
|
(__force u16)keys->ports.src))) {
|
|
swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
|
|
swap(keys->ports.src, keys->ports.dst);
|
|
}
|
|
break;
|
|
case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
|
|
addr_diff = memcmp(&keys->addrs.v6addrs.dst,
|
|
&keys->addrs.v6addrs.src,
|
|
sizeof(keys->addrs.v6addrs.dst));
|
|
if ((addr_diff < 0) ||
|
|
(addr_diff == 0 &&
|
|
((__force u16)keys->ports.dst <
|
|
(__force u16)keys->ports.src))) {
|
|
for (i = 0; i < 4; i++)
|
|
swap(keys->addrs.v6addrs.src.s6_addr32[i],
|
|
keys->addrs.v6addrs.dst.s6_addr32[i]);
|
|
swap(keys->ports.src, keys->ports.dst);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval)
|
|
{
|
|
u32 hash;
|
|
|
|
__flow_hash_consistentify(keys);
|
|
|
|
hash = __flow_hash_words(flow_keys_hash_start(keys),
|
|
flow_keys_hash_length(keys), keyval);
|
|
if (!hash)
|
|
hash = 1;
|
|
|
|
return hash;
|
|
}
|
|
|
|
u32 flow_hash_from_keys(struct flow_keys *keys)
|
|
{
|
|
__flow_hash_secret_init();
|
|
return __flow_hash_from_keys(keys, hashrnd);
|
|
}
|
|
EXPORT_SYMBOL(flow_hash_from_keys);
|
|
|
|
static inline u32 ___skb_get_hash(const struct sk_buff *skb,
|
|
struct flow_keys *keys, u32 keyval)
|
|
{
|
|
skb_flow_dissect_flow_keys(skb, keys,
|
|
FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL);
|
|
|
|
return __flow_hash_from_keys(keys, keyval);
|
|
}
|
|
|
|
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));
|
|
|
|
data->n_proto = flow->basic.n_proto;
|
|
data->ip_proto = flow->basic.ip_proto;
|
|
data->ports = flow->ports.ports;
|
|
data->src = flow->addrs.v4addrs.src;
|
|
data->dst = flow->addrs.v4addrs.dst;
|
|
}
|
|
EXPORT_SYMBOL(make_flow_keys_digest);
|
|
|
|
/**
|
|
* __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
|
|
* 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
|
|
* if hash is a canonical 4-tuple hash over transport ports.
|
|
*/
|
|
void __skb_get_hash(struct sk_buff *skb)
|
|
{
|
|
struct flow_keys keys;
|
|
|
|
__flow_hash_secret_init();
|
|
|
|
__skb_set_sw_hash(skb, ___skb_get_hash(skb, &keys, hashrnd),
|
|
flow_keys_have_l4(&keys));
|
|
}
|
|
EXPORT_SYMBOL(__skb_get_hash);
|
|
|
|
__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);
|
|
|
|
__u32 __skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6)
|
|
{
|
|
struct flow_keys keys;
|
|
|
|
memset(&keys, 0, sizeof(keys));
|
|
|
|
memcpy(&keys.addrs.v6addrs.src, &fl6->saddr,
|
|
sizeof(keys.addrs.v6addrs.src));
|
|
memcpy(&keys.addrs.v6addrs.dst, &fl6->daddr,
|
|
sizeof(keys.addrs.v6addrs.dst));
|
|
keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
|
|
keys.ports.src = fl6->fl6_sport;
|
|
keys.ports.dst = fl6->fl6_dport;
|
|
keys.keyid.keyid = fl6->fl6_gre_key;
|
|
keys.tags.flow_label = (__force u32)fl6->flowlabel;
|
|
keys.basic.ip_proto = fl6->flowi6_proto;
|
|
|
|
__skb_set_sw_hash(skb, flow_hash_from_keys(&keys),
|
|
flow_keys_have_l4(&keys));
|
|
|
|
return skb->hash;
|
|
}
|
|
EXPORT_SYMBOL(__skb_get_hash_flowi6);
|
|
|
|
__u32 __skb_get_hash_flowi4(struct sk_buff *skb, const struct flowi4 *fl4)
|
|
{
|
|
struct flow_keys keys;
|
|
|
|
memset(&keys, 0, sizeof(keys));
|
|
|
|
keys.addrs.v4addrs.src = fl4->saddr;
|
|
keys.addrs.v4addrs.dst = fl4->daddr;
|
|
keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
|
|
keys.ports.src = fl4->fl4_sport;
|
|
keys.ports.dst = fl4->fl4_dport;
|
|
keys.keyid.keyid = fl4->fl4_gre_key;
|
|
keys.basic.ip_proto = fl4->flowi4_proto;
|
|
|
|
__skb_set_sw_hash(skb, flow_hash_from_keys(&keys),
|
|
flow_keys_have_l4(&keys));
|
|
|
|
return skb->hash;
|
|
}
|
|
EXPORT_SYMBOL(__skb_get_hash_flowi4);
|
|
|
|
u32 __skb_get_poff(const struct sk_buff *skb, void *data,
|
|
const struct flow_keys *keys, int hlen)
|
|
{
|
|
u32 poff = keys->control.thoff;
|
|
|
|
/* skip L4 headers for fragments after the first */
|
|
if ((keys->control.flags & FLOW_DIS_IS_FRAGMENT) &&
|
|
!(keys->control.flags & FLOW_DIS_FIRST_FRAG))
|
|
return poff;
|
|
|
|
switch (keys->basic.ip_proto) {
|
|
case IPPROTO_TCP: {
|
|
/* access doff as u8 to avoid unaligned access */
|
|
const u8 *doff;
|
|
u8 _doff;
|
|
|
|
doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff),
|
|
data, hlen, &_doff);
|
|
if (!doff)
|
|
return poff;
|
|
|
|
poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2);
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* 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;
|
|
|
|
if (!skb_flow_dissect_flow_keys(skb, &keys, 0))
|
|
return 0;
|
|
|
|
return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
|
|
}
|
|
|
|
__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys)
|
|
{
|
|
memset(keys, 0, sizeof(*keys));
|
|
|
|
memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
|
|
sizeof(keys->addrs.v6addrs.src));
|
|
memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
|
|
sizeof(keys->addrs.v6addrs.dst));
|
|
keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
|
|
keys->ports.src = fl6->fl6_sport;
|
|
keys->ports.dst = fl6->fl6_dport;
|
|
keys->keyid.keyid = fl6->fl6_gre_key;
|
|
keys->tags.flow_label = (__force u32)fl6->flowlabel;
|
|
keys->basic.ip_proto = fl6->flowi6_proto;
|
|
|
|
return flow_hash_from_keys(keys);
|
|
}
|
|
EXPORT_SYMBOL(__get_hash_from_flowi6);
|
|
|
|
__u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys)
|
|
{
|
|
memset(keys, 0, sizeof(*keys));
|
|
|
|
keys->addrs.v4addrs.src = fl4->saddr;
|
|
keys->addrs.v4addrs.dst = fl4->daddr;
|
|
keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
|
|
keys->ports.src = fl4->fl4_sport;
|
|
keys->ports.dst = fl4->fl4_dport;
|
|
keys->keyid.keyid = fl4->fl4_gre_key;
|
|
keys->basic.ip_proto = fl4->flowi4_proto;
|
|
|
|
return flow_hash_from_keys(keys);
|
|
}
|
|
EXPORT_SYMBOL(__get_hash_from_flowi4);
|
|
|
|
static const struct flow_dissector_key flow_keys_dissector_keys[] = {
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_CONTROL,
|
|
.offset = offsetof(struct flow_keys, control),
|
|
},
|
|
{
|
|
.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.v4addrs),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
|
|
.offset = offsetof(struct flow_keys, addrs.v6addrs),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_TIPC_ADDRS,
|
|
.offset = offsetof(struct flow_keys, addrs.tipcaddrs),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_PORTS,
|
|
.offset = offsetof(struct flow_keys, ports),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_VLANID,
|
|
.offset = offsetof(struct flow_keys, tags),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
|
|
.offset = offsetof(struct flow_keys, tags),
|
|
},
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
|
|
.offset = offsetof(struct flow_keys, keyid),
|
|
},
|
|
};
|
|
|
|
static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = {
|
|
{
|
|
.key_id = FLOW_DISSECTOR_KEY_CONTROL,
|
|
.offset = offsetof(struct flow_keys, control),
|
|
},
|
|
{
|
|
.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);
|