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netfilter: flowtable: reduce calls to pskb_may_pull() 

Make two unfront calls to pskb_may_pull() to linearize the network and
transport header.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-10-12 00:18:07 +02:00
parent d3519cb89f
commit 793d5d6124
2 changed files with 30 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
net/netfilter/nf_flow_table_core.c
View File

@ -395,8 +395,7 @@ static int nf_flow_nat_port_tcp(struct sk_buff *skb, unsigned int thoff,
{
struct tcphdr *tcph;
if (!pskb_may_pull(skb, thoff + sizeof(*tcph)) ||
skb_try_make_writable(skb, thoff + sizeof(*tcph)))
if (skb_try_make_writable(skb, thoff + sizeof(*tcph)))
return -1;
tcph = (void *)(skb_network_header(skb) + thoff);
@ -410,8 +409,7 @@ static int nf_flow_nat_port_udp(struct sk_buff *skb, unsigned int thoff,
{
struct udphdr *udph;
if (!pskb_may_pull(skb, thoff + sizeof(*udph)) ||
skb_try_make_writable(skb, thoff + sizeof(*udph)))
if (skb_try_make_writable(skb, thoff + sizeof(*udph)))
return -1;
udph = (void *)(skb_network_header(skb) + thoff);
@ -449,8 +447,7 @@ int nf_flow_snat_port(const struct flow_offload *flow,
struct flow_ports *hdr;
__be16 port, new_port;
if (!pskb_may_pull(skb, thoff + sizeof(*hdr)) ||
skb_try_make_writable(skb, thoff + sizeof(*hdr)))
if (skb_try_make_writable(skb, thoff + sizeof(*hdr)))
return -1;
hdr = (void *)(skb_network_header(skb) + thoff);
@ -481,8 +478,7 @@ int nf_flow_dnat_port(const struct flow_offload *flow,
struct flow_ports *hdr;
__be16 port, new_port;
if (!pskb_may_pull(skb, thoff + sizeof(*hdr)) ||
skb_try_make_writable(skb, thoff + sizeof(*hdr)))
if (skb_try_make_writable(skb, thoff + sizeof(*hdr)))
return -1;
hdr = (void *)(skb_network_header(skb) + thoff);

45
net/netfilter/nf_flow_table_ip.c
View File

@ -25,9 +25,6 @@ static int nf_flow_state_check(struct flow_offload *flow, int proto,
if (proto != IPPROTO_TCP)
return 0;
if (!pskb_may_pull(skb, thoff + sizeof(*tcph)))
return -1;
tcph = (void *)(skb_network_header(skb) + thoff);
if (unlikely(tcph->fin || tcph->rst)) {
flow_offload_teardown(flow);
@ -42,8 +39,7 @@ static int nf_flow_nat_ip_tcp(struct sk_buff *skb, unsigned int thoff,
{
struct tcphdr *tcph;
if (!pskb_may_pull(skb, thoff + sizeof(*tcph)) ||
skb_try_make_writable(skb, thoff + sizeof(*tcph)))
if (skb_try_make_writable(skb, thoff + sizeof(*tcph)))
return -1;
tcph = (void *)(skb_network_header(skb) + thoff);
@ -57,8 +53,7 @@ static int nf_flow_nat_ip_udp(struct sk_buff *skb, unsigned int thoff,
{
struct udphdr *udph;
if (!pskb_may_pull(skb, thoff + sizeof(*udph)) ||
skb_try_make_writable(skb, thoff + sizeof(*udph)))
if (skb_try_make_writable(skb, thoff + sizeof(*udph)))
return -1;
udph = (void *)(skb_network_header(skb) + thoff);
@ -167,8 +162,8 @@ static bool ip_has_options(unsigned int thoff)
static int nf_flow_tuple_ip(struct sk_buff *skb, const struct net_device *dev,
struct flow_offload_tuple *tuple)
{
unsigned int thoff, hdrsize;
struct flow_ports *ports;
unsigned int thoff;
struct iphdr *iph;
if (!pskb_may_pull(skb, sizeof(*iph)))
@ -181,15 +176,22 @@ static int nf_flow_tuple_ip(struct sk_buff *skb, const struct net_device *dev,
unlikely(ip_has_options(thoff)))
return -1;
if (iph->protocol != IPPROTO_TCP &&
iph->protocol != IPPROTO_UDP)
switch (iph->protocol) {
case IPPROTO_TCP:
hdrsize = sizeof(struct tcphdr);
break;
case IPPROTO_UDP:
hdrsize = sizeof(struct udphdr);
break;
default:
return -1;
}
if (iph->ttl <= 1)
return -1;
thoff = iph->ihl * 4;
if (!pskb_may_pull(skb, thoff + sizeof(*ports)))
if (!pskb_may_pull(skb, thoff + hdrsize))
return -1;
iph = ip_hdr(skb);
@ -315,8 +317,7 @@ static int nf_flow_nat_ipv6_tcp(struct sk_buff *skb, unsigned int thoff,
{
struct tcphdr *tcph;
if (!pskb_may_pull(skb, thoff + sizeof(*tcph)) ||
skb_try_make_writable(skb, thoff + sizeof(*tcph)))
if (skb_try_make_writable(skb, thoff + sizeof(*tcph)))
return -1;
tcph = (void *)(skb_network_header(skb) + thoff);
@ -332,8 +333,7 @@ static int nf_flow_nat_ipv6_udp(struct sk_buff *skb, unsigned int thoff,
{
struct udphdr *udph;
if (!pskb_may_pull(skb, thoff + sizeof(*udph)) ||
skb_try_make_writable(skb, thoff + sizeof(*udph)))
if (skb_try_make_writable(skb, thoff + sizeof(*udph)))
return -1;
udph = (void *)(skb_network_header(skb) + thoff);
@ -439,24 +439,31 @@ static int nf_flow_nat_ipv6(const struct flow_offload *flow,
static int nf_flow_tuple_ipv6(struct sk_buff *skb, const struct net_device *dev,
struct flow_offload_tuple *tuple)
{
unsigned int thoff, hdrsize;
struct flow_ports *ports;
struct ipv6hdr *ip6h;
unsigned int thoff;
if (!pskb_may_pull(skb, sizeof(*ip6h)))
return -1;
ip6h = ipv6_hdr(skb);
if (ip6h->nexthdr != IPPROTO_TCP &&
ip6h->nexthdr != IPPROTO_UDP)
switch (ip6h->nexthdr) {
case IPPROTO_TCP:
hdrsize = sizeof(struct tcphdr);
break;
case IPPROTO_UDP:
hdrsize = sizeof(struct udphdr);
break;
default:
return -1;
}
if (ip6h->hop_limit <= 1)
return -1;
thoff = sizeof(*ip6h);
if (!pskb_may_pull(skb, thoff + sizeof(*ports)))
if (!pskb_may_pull(skb, thoff + hdrsize))
return -1;
ip6h = ipv6_hdr(skb);