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authorJiri Pirko <jiri@resnulli.us>2015-05-12 14:56:16 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-13 15:19:47 -0400
commit06635a35d13d42b95422bba6633f175245cc644e (patch)
treee01b5950a62e2f7447128b06f996b573d7b14557 /net
parentfbff949e3bc7f3f7d9e8b3ef4855ec7138276a25 (diff)
flow_dissect: use programable dissector in skb_flow_dissect and friends
Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/flow_dissector.c199
-rw-r--r--net/ethernet/eth.c6
-rw-r--r--net/sched/cls_flow.c20
-rw-r--r--net/sched/sch_choke.c4
4 files changed, 153 insertions, 76 deletions
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 6883e22b8fc4..6a49acaa6651 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -13,6 +13,7 @@
#include <linux/if_tunnel.h>
#include <linux/if_pppox.h>
#include <linux/ppp_defs.h>
+#include <linux/stddef.h>
#include <net/flow_dissector.h>
#include <scsi/fc/fc_fcoe.h>
@@ -63,17 +64,6 @@ void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
}
EXPORT_SYMBOL(skb_flow_dissector_init);
-/* copy saddr & daddr, possibly using 64bit load/store
- * Equivalent to : flow->src = iph->saddr;
- * flow->dst = iph->daddr;
- */
-static void iph_to_flow_copy_addrs(struct flow_keys *flow, const struct iphdr *iph)
-{
- BUILD_BUG_ON(offsetof(typeof(*flow), dst) !=
- offsetof(typeof(*flow), src) + sizeof(flow->src));
- memcpy(&flow->src, &iph->saddr, sizeof(flow->src) + sizeof(flow->dst));
-}
-
/**
* __skb_flow_get_ports - extract the upper layer ports and return them
* @skb: sk_buff to extract the ports from
@@ -111,17 +101,27 @@ EXPORT_SYMBOL(__skb_flow_get_ports);
/**
* __skb_flow_dissect - extract the flow_keys struct and return it
* @skb: sk_buff to extract the flow from, can be NULL if the rest are specified
+ * @flow_dissector: list of keys to dissect
+ * @target_container: target structure to put dissected values into
* @data: raw buffer pointer to the packet, if NULL use skb->data
* @proto: protocol for which to get the flow, if @data is NULL use skb->protocol
* @nhoff: network header offset, if @data is NULL use skb_network_offset(skb)
* @hlen: packet header length, if @data is NULL use skb_headlen(skb)
*
- * The function will try to retrieve the struct flow_keys from either the skbuff
- * or a raw buffer specified by the rest parameters
+ * The function will try to retrieve individual keys into target specified
+ * by flow_dissector from either the skbuff or a raw buffer specified by the
+ * rest parameters.
+ *
+ * Caller must take care of zeroing target container memory.
*/
-bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow,
+bool __skb_flow_dissect(const struct sk_buff *skb,
+ struct flow_dissector *flow_dissector,
+ void *target_container,
void *data, __be16 proto, int nhoff, int hlen)
{
+ struct flow_dissector_key_basic *key_basic;
+ struct flow_dissector_key_addrs *key_addrs;
+ struct flow_dissector_key_ports *key_ports;
u8 ip_proto;
if (!data) {
@@ -131,7 +131,12 @@ bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow,
hlen = skb_headlen(skb);
}
- memset(flow, 0, sizeof(*flow));
+ /* 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);
again:
switch (proto) {
@@ -148,14 +153,13 @@ ip:
if (ip_is_fragment(iph))
ip_proto = 0;
- /* skip the address processing if skb is NULL. The assumption
- * here is that if there is no skb we are not looking for flow
- * info but lengths and protocols.
- */
- if (!skb)
+ if (!skb_flow_dissector_uses_key(flow_dissector,
+ FLOW_DISSECTOR_KEY_IPV4_ADDRS))
break;
-
- iph_to_flow_copy_addrs(flow, iph);
+ key_addrs = skb_flow_dissector_target(flow_dissector,
+ FLOW_DISSECTOR_KEY_IPV4_ADDRS,
+ target_container);
+ memcpy(key_addrs, &iph->saddr, sizeof(*key_addrs));
break;
}
case htons(ETH_P_IPV6): {
@@ -171,12 +175,15 @@ ipv6:
ip_proto = iph->nexthdr;
nhoff += sizeof(struct ipv6hdr);
- /* see comment above in IPv4 section */
- if (!skb)
+ if (!skb_flow_dissector_uses_key(flow_dissector,
+ FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS))
break;
+ key_addrs = skb_flow_dissector_target(flow_dissector,
+ FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS,
+ target_container);
- flow->src = (__force __be32)ipv6_addr_hash(&iph->saddr);
- flow->dst = (__force __be32)ipv6_addr_hash(&iph->daddr);
+ key_addrs->src = (__force __be32)ipv6_addr_hash(&iph->saddr);
+ key_addrs->dst = (__force __be32)ipv6_addr_hash(&iph->daddr);
flow_label = ip6_flowlabel(iph);
if (flow_label) {
@@ -184,10 +191,18 @@ ipv6:
* use that to represent the ports without any
* further dissection.
*/
- flow->n_proto = proto;
- flow->ip_proto = ip_proto;
- flow->ports = flow_label;
- flow->thoff = (u16)nhoff;
+
+ 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))
+ break;
+ key_ports = skb_flow_dissector_target(flow_dissector,
+ FLOW_DISSECTOR_KEY_PORTS,
+ target_container);
+ key_ports->ports = flow_label;
return true;
}
@@ -234,14 +249,22 @@ ipv6:
hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
if (!hdr)
return false;
- flow->src = hdr->srcnode;
- flow->dst = 0;
- flow->n_proto = proto;
- flow->thoff = (u16)nhoff;
+ key_basic->n_proto = proto;
+ key_basic->thoff = (u16)nhoff;
+
+ if (skb_flow_dissector_uses_key(flow_dissector,
+ FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS)) {
+ return true;
+ key_addrs = skb_flow_dissector_target(flow_dissector,
+ FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS,
+ target_container);
+ key_addrs->src = hdr->srcnode;
+ key_addrs->dst = 0;
+ }
return true;
}
case htons(ETH_P_FCOE):
- flow->thoff = (u16)(nhoff + FCOE_HEADER_LEN);
+ key_basic->thoff = (u16)(nhoff + FCOE_HEADER_LEN);
/* fall through */
default:
return false;
@@ -296,14 +319,24 @@ ipv6:
break;
}
- flow->n_proto = proto;
- flow->ip_proto = ip_proto;
- flow->thoff = (u16) nhoff;
-
- /* unless skb is set we don't need to record port info */
- if (skb)
- flow->ports = __skb_flow_get_ports(skb, nhoff, ip_proto,
- data, hlen);
+ /* 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);
+ }
return true;
}
@@ -325,16 +358,16 @@ static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval)
u32 hash;
/* get a consistent hash (same value on both flow directions) */
- if (((__force u32)keys->dst < (__force u32)keys->src) ||
- (((__force u32)keys->dst == (__force u32)keys->src) &&
- ((__force u16)keys->port16[1] < (__force u16)keys->port16[0]))) {
- swap(keys->dst, keys->src);
- swap(keys->port16[0], keys->port16[1]);
+ 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]);
}
- hash = __flow_hash_3words((__force u32)keys->dst,
- (__force u32)keys->src,
- (__force u32)keys->ports,
+ hash = __flow_hash_3words((__force u32)keys->addrs.dst,
+ (__force u32)keys->addrs.src,
+ (__force u32)keys->ports.ports,
keyval);
if (!hash)
hash = 1;
@@ -352,7 +385,7 @@ EXPORT_SYMBOL(flow_hash_from_keys);
static inline u32 ___skb_get_hash(const struct sk_buff *skb,
struct flow_keys *keys, u32 keyval)
{
- if (!skb_flow_dissect(skb, keys))
+ if (!skb_flow_dissect_flow_keys(skb, keys))
return 0;
return __flow_hash_from_keys(keys, keyval);
@@ -377,11 +410,11 @@ void make_flow_keys_digest(struct flow_keys_digest *digest,
memset(digest, 0, sizeof(*digest));
- data->n_proto = flow->n_proto;
- data->ip_proto = flow->ip_proto;
- data->ports = flow->ports;
- data->src = flow->src;
- data->dst = flow->dst;
+ 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;
}
EXPORT_SYMBOL(make_flow_keys_digest);
@@ -404,7 +437,7 @@ void __skb_get_hash(struct sk_buff *skb)
hash = ___skb_get_hash(skb, &keys, hashrnd);
if (!hash)
return;
- if (keys.ports)
+ if (keys.ports.ports)
skb->l4_hash = 1;
skb->sw_hash = 1;
skb->hash = hash;
@@ -422,9 +455,9 @@ EXPORT_SYMBOL(skb_get_hash_perturb);
u32 __skb_get_poff(const struct sk_buff *skb, void *data,
const struct flow_keys *keys, int hlen)
{
- u32 poff = keys->thoff;
+ u32 poff = keys->basic.thoff;
- switch (keys->ip_proto) {
+ switch (keys->basic.ip_proto) {
case IPPROTO_TCP: {
/* access doff as u8 to avoid unaligned access */
const u8 *doff;
@@ -478,8 +511,52 @@ u32 skb_get_poff(const struct sk_buff *skb)
{
struct flow_keys keys;
- if (!skb_flow_dissect(skb, &keys))
+ if (!skb_flow_dissect_flow_keys(skb, &keys))
return 0;
return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb));
}
+
+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);
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 9332a0ab0698..c3325bd2f3fb 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -131,9 +131,9 @@ u32 eth_get_headlen(void *data, unsigned int len)
return len;
/* parse any remaining L2/L3 headers, check for L4 */
- if (!__skb_flow_dissect(NULL, &keys, data,
- eth->h_proto, sizeof(*eth), len))
- return max_t(u32, keys.thoff, sizeof(*eth));
+ if (!skb_flow_dissect_flow_keys_buf(&keys, data, eth->h_proto,
+ sizeof(*eth), len))
+ return max_t(u32, keys.basic.thoff, sizeof(*eth));
/* parse for any L4 headers */
return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index 4c5a92298906..4b3e3e30bf4d 100644
--- a/net/sched/cls_flow.c
+++ b/net/sched/cls_flow.c
@@ -68,35 +68,35 @@ static inline u32 addr_fold(void *addr)
static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow)
{
- if (flow->src)
- return ntohl(flow->src);
+ if (flow->addrs.src)
+ return ntohl(flow->addrs.src);
return addr_fold(skb->sk);
}
static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow)
{
- if (flow->dst)
- return ntohl(flow->dst);
+ if (flow->addrs.dst)
+ return ntohl(flow->addrs.dst);
return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb);
}
static u32 flow_get_proto(const struct sk_buff *skb, const struct flow_keys *flow)
{
- return flow->ip_proto;
+ return flow->basic.ip_proto;
}
static u32 flow_get_proto_src(const struct sk_buff *skb, const struct flow_keys *flow)
{
- if (flow->ports)
- return ntohs(flow->port16[0]);
+ if (flow->ports.ports)
+ return ntohs(flow->ports.port16[0]);
return addr_fold(skb->sk);
}
static u32 flow_get_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow)
{
- if (flow->ports)
- return ntohs(flow->port16[1]);
+ if (flow->ports.ports)
+ return ntohs(flow->ports.port16[1]);
return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb);
}
@@ -295,7 +295,7 @@ static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
keymask = f->keymask;
if (keymask & FLOW_KEYS_NEEDED)
- skb_flow_dissect(skb, &flow_keys);
+ skb_flow_dissect_flow_keys(skb, &flow_keys);
for (n = 0; n < f->nkeys; n++) {
key = ffs(keymask) - 1;
diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index 2624e991a2d1..93d5742dc7e0 100644
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -170,13 +170,13 @@ static bool choke_match_flow(struct sk_buff *skb1,
if (!choke_skb_cb(skb1)->keys_valid) {
choke_skb_cb(skb1)->keys_valid = 1;
- skb_flow_dissect(skb1, &temp);
+ skb_flow_dissect_flow_keys(skb1, &temp);
make_flow_keys_digest(&choke_skb_cb(skb1)->keys, &temp);
}
if (!choke_skb_cb(skb2)->keys_valid) {
choke_skb_cb(skb2)->keys_valid = 1;
- skb_flow_dissect(skb2, &temp);
+ skb_flow_dissect_flow_keys(skb2, &temp);
make_flow_keys_digest(&choke_skb_cb(skb2)->keys, &temp);
}

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