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net/sched: act_ct: Fix ipv6 lookup of offloaded connections 

When checking the protocol number tcf_ct_flow_table_lookup() handles
the flow as if it's always ipv4, while it can be ipv6.

Instead, refactor the code to fetch the tcp header, if available,
in the relevant family (ipv4/ipv6) filler function, and do the
check on the returned tcp header.

Fixes: 46475bb20f ("net/sched: act_ct: Software offload of established flows")
Signed-off-by: Paul Blakey <paulb@mellanox.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Blakey 2020-03-04 13:49:38 +02:00 committed by David S. Miller
parent 97ec3b21b2
commit 07ac9d16b4
1 changed files with 26 additions and 34 deletions
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60
net/sched/act_ct.c
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@ -188,7 +188,8 @@ static void tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table *ct_ft,
static bool
tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
struct flow_offload_tuple *tuple)
struct flow_offload_tuple *tuple,
struct tcphdr **tcph)
{
struct flow_ports *ports;
unsigned int thoff;
@ -211,11 +212,16 @@ tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
if (iph->ttl <= 1)
return false;
if (!pskb_may_pull(skb, thoff + sizeof(*ports)))
if (!pskb_may_pull(skb, iph->protocol == IPPROTO_TCP ?
thoff + sizeof(struct tcphdr) :
thoff + sizeof(*ports)))
return false;
ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
iph = ip_hdr(skb);
if (iph->protocol == IPPROTO_TCP)
*tcph = (void *)(skb_network_header(skb) + thoff);
ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
tuple->src_v4.s_addr = iph->saddr;
tuple->dst_v4.s_addr = iph->daddr;
tuple->src_port = ports->source;
@ -228,7 +234,8 @@ tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
static bool
tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
struct flow_offload_tuple *tuple)
struct flow_offload_tuple *tuple,
struct tcphdr **tcph)
{
struct flow_ports *ports;
struct ipv6hdr *ip6h;
@ -247,11 +254,16 @@ tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
return false;
thoff = sizeof(*ip6h);
if (!pskb_may_pull(skb, thoff + sizeof(*ports)))
if (!pskb_may_pull(skb, ip6h->nexthdr == IPPROTO_TCP ?
thoff + sizeof(struct tcphdr) :
thoff + sizeof(*ports)))
return false;
ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
ip6h = ipv6_hdr(skb);
if (ip6h->nexthdr == IPPROTO_TCP)
*tcph = (void *)(skb_network_header(skb) + thoff);
ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
tuple->src_v6 = ip6h->saddr;
tuple->dst_v6 = ip6h->daddr;
tuple->src_port = ports->source;
@ -262,24 +274,6 @@ tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
return true;
}
static bool tcf_ct_flow_table_check_tcp(struct flow_offload *flow,
struct sk_buff *skb,
unsigned int thoff)
{
struct tcphdr *tcph;
if (!pskb_may_pull(skb, thoff + sizeof(*tcph)))
return false;
tcph = (void *)(skb_network_header(skb) + thoff);
if (unlikely(tcph->fin || tcph->rst)) {
flow_offload_teardown(flow);
return false;
}
return true;
}
static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p,
struct sk_buff *skb,
u8 family)
@ -288,10 +282,9 @@ static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p,
struct flow_offload_tuple_rhash *tuplehash;
struct flow_offload_tuple tuple = {};
enum ip_conntrack_info ctinfo;
struct tcphdr *tcph = NULL;
struct flow_offload *flow;
struct nf_conn *ct;
unsigned int thoff;
int ip_proto;
u8 dir;
/* Previously seen or loopback */
@ -301,11 +294,11 @@ static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p,
switch (family) {
case NFPROTO_IPV4:
if (!tcf_ct_flow_table_fill_tuple_ipv4(skb, &tuple))
if (!tcf_ct_flow_table_fill_tuple_ipv4(skb, &tuple, &tcph))
return false;
break;
case NFPROTO_IPV6:
if (!tcf_ct_flow_table_fill_tuple_ipv6(skb, &tuple))
if (!tcf_ct_flow_table_fill_tuple_ipv6(skb, &tuple, &tcph))
return false;
break;
default:
@ -320,15 +313,14 @@ static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p,
flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
ct = flow->ct;
if (tcph && (unlikely(tcph->fin || tcph->rst))) {
flow_offload_teardown(flow);
return false;
}
ctinfo = dir == FLOW_OFFLOAD_DIR_ORIGINAL ? IP_CT_ESTABLISHED :
IP_CT_ESTABLISHED_REPLY;
thoff = ip_hdr(skb)->ihl * 4;
ip_proto = ip_hdr(skb)->protocol;
if (ip_proto == IPPROTO_TCP &&
!tcf_ct_flow_table_check_tcp(flow, skb, thoff))
return false;
nf_conntrack_get(&ct->ct_general);
nf_ct_set(skb, ct, ctinfo);