mirror of https://gitee.com/openkylin/linux.git
net_sched: cls_flow: use skb_header_pointer()
Dan Siemon would like to add tunnelling support to cls_flow This preliminary patch introduces use of skb_header_pointer() to help this task, while avoiding skb head reallocation because of deep packet inspection. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
David S. Miller
parent
59445b6b1f
commit
859c20123a
|
|
@ -65,132 +65,134 @@ static inline u32 addr_fold(void *addr)
|
|||
return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
|
||||
}
|
||||
|
||||
static u32 flow_get_src(struct sk_buff *skb)
|
||||
static u32 flow_get_src(const struct sk_buff *skb, int nhoff)
|
||||
{
|
||||
__be32 *data = NULL, hdata;
|
||||
|
||||
switch (skb->protocol) {
|
||||
case htons(ETH_P_IP):
|
||||
if (pskb_network_may_pull(skb, sizeof(struct iphdr)))
|
||||
return ntohl(ip_hdr(skb)->saddr);
|
||||
data = skb_header_pointer(skb,
|
||||
nhoff + offsetof(struct iphdr,
|
||||
saddr),
|
||||
4, &hdata);
|
||||
break;
|
||||
case htons(ETH_P_IPV6):
|
||||
if (pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
|
||||
return ntohl(ipv6_hdr(skb)->saddr.s6_addr32[3]);
|
||||
data = skb_header_pointer(skb,
|
||||
nhoff + offsetof(struct ipv6hdr,
|
||||
saddr.s6_addr32[3]),
|
||||
4, &hdata);
|
||||
break;
|
||||
}
|
||||
|
||||
if (data)
|
||||
return ntohl(*data);
|
||||
return addr_fold(skb->sk);
|
||||
}
|
||||
|
||||
static u32 flow_get_dst(struct sk_buff *skb)
|
||||
static u32 flow_get_dst(const struct sk_buff *skb, int nhoff)
|
||||
{
|
||||
__be32 *data = NULL, hdata;
|
||||
|
||||
switch (skb->protocol) {
|
||||
case htons(ETH_P_IP):
|
||||
if (pskb_network_may_pull(skb, sizeof(struct iphdr)))
|
||||
return ntohl(ip_hdr(skb)->daddr);
|
||||
data = skb_header_pointer(skb,
|
||||
nhoff + offsetof(struct iphdr,
|
||||
daddr),
|
||||
4, &hdata);
|
||||
break;
|
||||
case htons(ETH_P_IPV6):
|
||||
if (pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
|
||||
return ntohl(ipv6_hdr(skb)->daddr.s6_addr32[3]);
|
||||
data = skb_header_pointer(skb,
|
||||
nhoff + offsetof(struct ipv6hdr,
|
||||
daddr.s6_addr32[3]),
|
||||
4, &hdata);
|
||||
break;
|
||||
}
|
||||
|
||||
if (data)
|
||||
return ntohl(*data);
|
||||
return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
|
||||
}
|
||||
|
||||
static u32 flow_get_proto(struct sk_buff *skb)
|
||||
static u32 flow_get_proto(const struct sk_buff *skb, int nhoff)
|
||||
{
|
||||
__u8 *data = NULL, hdata;
|
||||
|
||||
switch (skb->protocol) {
|
||||
case htons(ETH_P_IP):
|
||||
return pskb_network_may_pull(skb, sizeof(struct iphdr)) ?
|
||||
ip_hdr(skb)->protocol : 0;
|
||||
data = skb_header_pointer(skb,
|
||||
nhoff + offsetof(struct iphdr,
|
||||
protocol),
|
||||
1, &hdata);
|
||||
break;
|
||||
case htons(ETH_P_IPV6):
|
||||
return pskb_network_may_pull(skb, sizeof(struct ipv6hdr)) ?
|
||||
ipv6_hdr(skb)->nexthdr : 0;
|
||||
default:
|
||||
return 0;
|
||||
data = skb_header_pointer(skb,
|
||||
nhoff + offsetof(struct ipv6hdr,
|
||||
nexthdr),
|
||||
1, &hdata);
|
||||
break;
|
||||
}
|
||||
if (data)
|
||||
return *data;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static u32 flow_get_proto_src(struct sk_buff *skb)
|
||||
/* helper function to get either src or dst port */
|
||||
static __be16 *flow_get_proto_common(const struct sk_buff *skb, int nhoff,
|
||||
__be16 *_port, int dst)
|
||||
{
|
||||
__be16 *port = NULL;
|
||||
int poff;
|
||||
|
||||
switch (skb->protocol) {
|
||||
case htons(ETH_P_IP): {
|
||||
struct iphdr *iph;
|
||||
int poff;
|
||||
struct iphdr *iph, _iph;
|
||||
|
||||
if (!pskb_network_may_pull(skb, sizeof(*iph)))
|
||||
iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
|
||||
if (!iph)
|
||||
break;
|
||||
iph = ip_hdr(skb);
|
||||
if (ip_is_fragment(iph))
|
||||
break;
|
||||
poff = proto_ports_offset(iph->protocol);
|
||||
if (poff >= 0 &&
|
||||
pskb_network_may_pull(skb, iph->ihl * 4 + 2 + poff)) {
|
||||
iph = ip_hdr(skb);
|
||||
return ntohs(*(__be16 *)((void *)iph + iph->ihl * 4 +
|
||||
poff));
|
||||
}
|
||||
if (poff >= 0)
|
||||
port = skb_header_pointer(skb,
|
||||
nhoff + iph->ihl * 4 + poff + dst,
|
||||
sizeof(*_port), _port);
|
||||
break;
|
||||
}
|
||||
case htons(ETH_P_IPV6): {
|
||||
struct ipv6hdr *iph;
|
||||
int poff;
|
||||
struct ipv6hdr *iph, _iph;
|
||||
|
||||
if (!pskb_network_may_pull(skb, sizeof(*iph)))
|
||||
iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
|
||||
if (!iph)
|
||||
break;
|
||||
iph = ipv6_hdr(skb);
|
||||
poff = proto_ports_offset(iph->nexthdr);
|
||||
if (poff >= 0 &&
|
||||
pskb_network_may_pull(skb, sizeof(*iph) + poff + 2)) {
|
||||
iph = ipv6_hdr(skb);
|
||||
return ntohs(*(__be16 *)((void *)iph + sizeof(*iph) +
|
||||
poff));
|
||||
}
|
||||
if (poff >= 0)
|
||||
port = skb_header_pointer(skb,
|
||||
nhoff + sizeof(*iph) + poff + dst,
|
||||
sizeof(*_port), _port);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return port;
|
||||
}
|
||||
|
||||
static u32 flow_get_proto_src(const struct sk_buff *skb, int nhoff)
|
||||
{
|
||||
__be16 _port, *port = flow_get_proto_common(skb, nhoff, &_port, 0);
|
||||
|
||||
if (port)
|
||||
return ntohs(*port);
|
||||
|
||||
return addr_fold(skb->sk);
|
||||
}
|
||||
|
||||
static u32 flow_get_proto_dst(struct sk_buff *skb)
|
||||
static u32 flow_get_proto_dst(const struct sk_buff *skb, int nhoff)
|
||||
{
|
||||
switch (skb->protocol) {
|
||||
case htons(ETH_P_IP): {
|
||||
struct iphdr *iph;
|
||||
int poff;
|
||||
__be16 _port, *port = flow_get_proto_common(skb, nhoff, &_port, 2);
|
||||
|
||||
if (!pskb_network_may_pull(skb, sizeof(*iph)))
|
||||
break;
|
||||
iph = ip_hdr(skb);
|
||||
if (ip_is_fragment(iph))
|
||||
break;
|
||||
poff = proto_ports_offset(iph->protocol);
|
||||
if (poff >= 0 &&
|
||||
pskb_network_may_pull(skb, iph->ihl * 4 + 4 + poff)) {
|
||||
iph = ip_hdr(skb);
|
||||
return ntohs(*(__be16 *)((void *)iph + iph->ihl * 4 +
|
||||
2 + poff));
|
||||
}
|
||||
break;
|
||||
}
|
||||
case htons(ETH_P_IPV6): {
|
||||
struct ipv6hdr *iph;
|
||||
int poff;
|
||||
|
||||
if (!pskb_network_may_pull(skb, sizeof(*iph)))
|
||||
break;
|
||||
iph = ipv6_hdr(skb);
|
||||
poff = proto_ports_offset(iph->nexthdr);
|
||||
if (poff >= 0 &&
|
||||
pskb_network_may_pull(skb, sizeof(*iph) + poff + 4)) {
|
||||
iph = ipv6_hdr(skb);
|
||||
return ntohs(*(__be16 *)((void *)iph + sizeof(*iph) +
|
||||
poff + 2));
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (port)
|
||||
return ntohs(*port);
|
||||
|
||||
return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
|
||||
}
|
||||
|
|
@ -223,7 +225,7 @@ static u32 flow_get_nfct(const struct sk_buff *skb)
|
|||
#define CTTUPLE(skb, member) \
|
||||
({ \
|
||||
enum ip_conntrack_info ctinfo; \
|
||||
struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \
|
||||
const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \
|
||||
if (ct == NULL) \
|
||||
goto fallback; \
|
||||
ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \
|
||||
|
|
@ -236,7 +238,7 @@ static u32 flow_get_nfct(const struct sk_buff *skb)
|
|||
})
|
||||
#endif
|
||||
|
||||
static u32 flow_get_nfct_src(struct sk_buff *skb)
|
||||
static u32 flow_get_nfct_src(const struct sk_buff *skb, int nhoff)
|
||||
{
|
||||
switch (skb->protocol) {
|
||||
case htons(ETH_P_IP):
|
||||
|
|
@ -245,10 +247,10 @@ static u32 flow_get_nfct_src(struct sk_buff *skb)
|
|||
return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
|
||||
}
|
||||
fallback:
|
||||
return flow_get_src(skb);
|
||||
return flow_get_src(skb, nhoff);
|
||||
}
|
||||
|
||||
static u32 flow_get_nfct_dst(struct sk_buff *skb)
|
||||
static u32 flow_get_nfct_dst(const struct sk_buff *skb, int nhoff)
|
||||
{
|
||||
switch (skb->protocol) {
|
||||
case htons(ETH_P_IP):
|
||||
|
|
@ -257,21 +259,21 @@ static u32 flow_get_nfct_dst(struct sk_buff *skb)
|
|||
return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
|
||||
}
|
||||
fallback:
|
||||
return flow_get_dst(skb);
|
||||
return flow_get_dst(skb, nhoff);
|
||||
}
|
||||
|
||||
static u32 flow_get_nfct_proto_src(struct sk_buff *skb)
|
||||
static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, int nhoff)
|
||||
{
|
||||
return ntohs(CTTUPLE(skb, src.u.all));
|
||||
fallback:
|
||||
return flow_get_proto_src(skb);
|
||||
return flow_get_proto_src(skb, nhoff);
|
||||
}
|
||||
|
||||
static u32 flow_get_nfct_proto_dst(struct sk_buff *skb)
|
||||
static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, int nhoff)
|
||||
{
|
||||
return ntohs(CTTUPLE(skb, dst.u.all));
|
||||
fallback:
|
||||
return flow_get_proto_dst(skb);
|
||||
return flow_get_proto_dst(skb, nhoff);
|
||||
}
|
||||
|
||||
static u32 flow_get_rtclassid(const struct sk_buff *skb)
|
||||
|
|
@ -313,17 +315,19 @@ static u32 flow_get_rxhash(struct sk_buff *skb)
|
|||
|
||||
static u32 flow_key_get(struct sk_buff *skb, int key)
|
||||
{
|
||||
int nhoff = skb_network_offset(skb);
|
||||
|
||||
switch (key) {
|
||||
case FLOW_KEY_SRC:
|
||||
return flow_get_src(skb);
|
||||
return flow_get_src(skb, nhoff);
|
||||
case FLOW_KEY_DST:
|
||||
return flow_get_dst(skb);
|
||||
return flow_get_dst(skb, nhoff);
|
||||
case FLOW_KEY_PROTO:
|
||||
return flow_get_proto(skb);
|
||||
return flow_get_proto(skb, nhoff);
|
||||
case FLOW_KEY_PROTO_SRC:
|
||||
return flow_get_proto_src(skb);
|
||||
return flow_get_proto_src(skb, nhoff);
|
||||
case FLOW_KEY_PROTO_DST:
|
||||
return flow_get_proto_dst(skb);
|
||||
return flow_get_proto_dst(skb, nhoff);
|
||||
case FLOW_KEY_IIF:
|
||||
return flow_get_iif(skb);
|
||||
case FLOW_KEY_PRIORITY:
|
||||
|
|
@ -333,13 +337,13 @@ static u32 flow_key_get(struct sk_buff *skb, int key)
|
|||
case FLOW_KEY_NFCT:
|
||||
return flow_get_nfct(skb);
|
||||
case FLOW_KEY_NFCT_SRC:
|
||||
return flow_get_nfct_src(skb);
|
||||
return flow_get_nfct_src(skb, nhoff);
|
||||
case FLOW_KEY_NFCT_DST:
|
||||
return flow_get_nfct_dst(skb);
|
||||
return flow_get_nfct_dst(skb, nhoff);
|
||||
case FLOW_KEY_NFCT_PROTO_SRC:
|
||||
return flow_get_nfct_proto_src(skb);
|
||||
return flow_get_nfct_proto_src(skb, nhoff);
|
||||
case FLOW_KEY_NFCT_PROTO_DST:
|
||||
return flow_get_nfct_proto_dst(skb);
|
||||
return flow_get_nfct_proto_dst(skb, nhoff);
|
||||
case FLOW_KEY_RTCLASSID:
|
||||
return flow_get_rtclassid(skb);
|
||||
case FLOW_KEY_SKUID:
|
||||
|
|
|
|||
Loading…
Reference in New Issue