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netfilter: flowtable: add offload support for xmit path types 

When the flow tuple xmit_type is set to FLOW_OFFLOAD_XMIT_DIRECT, the
dst_cache pointer is not valid, and the h_source/h_dest/ifidx out fields
need to be used.

This patch also adds the FLOW_ACTION_VLAN_PUSH action to pass the VLAN
tag to the driver.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pablo Neira Ayuso 2021-03-24 02:30:46 +01:00 committed by David S. Miller
parent 79d4071ea4
commit eeff3000f2
1 changed files with 123 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

164
net/netfilter/nf_flow_table_offload.c
View File

@ -177,28 +177,45 @@ static int flow_offload_eth_src(struct net *net,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
const struct flow_offload_tuple *tuple = &flow->tuplehash[!dir].tuple;
struct flow_action_entry *entry0 = flow_action_entry_next(flow_rule);
struct flow_action_entry *entry1 = flow_action_entry_next(flow_rule);
struct net_device *dev;
const struct flow_offload_tuple *other_tuple, *this_tuple;
struct net_device *dev = NULL;
const unsigned char *addr;
u32 mask, val;
u16 val16;
dev = dev_get_by_index(net, tuple->iifidx);
if (!dev)
return -ENOENT;
this_tuple = &flow->tuplehash[dir].tuple;
switch (this_tuple->xmit_type) {
case FLOW_OFFLOAD_XMIT_DIRECT:
addr = this_tuple->out.h_source;
break;
case FLOW_OFFLOAD_XMIT_NEIGH:
other_tuple = &flow->tuplehash[!dir].tuple;
dev = dev_get_by_index(net, other_tuple->iifidx);
if (!dev)
return -ENOENT;
addr = dev->dev_addr;
break;
default:
return -EOPNOTSUPP;
}
mask = ~0xffff0000;
memcpy(&val16, dev->dev_addr, 2);
memcpy(&val16, addr, 2);
val = val16 << 16;
flow_offload_mangle(entry0, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 4,
&val, &mask);
mask = ~0xffffffff;
memcpy(&val, dev->dev_addr + 2, 4);
memcpy(&val, addr + 2, 4);
flow_offload_mangle(entry1, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 8,
&val, &mask);
dev_put(dev);
if (dev)
dev_put(dev);
return 0;
}
@ -210,27 +227,40 @@ static int flow_offload_eth_dst(struct net *net,
{
struct flow_action_entry *entry0 = flow_action_entry_next(flow_rule);
struct flow_action_entry *entry1 = flow_action_entry_next(flow_rule);
const void *daddr = &flow->tuplehash[!dir].tuple.src_v4;
const struct flow_offload_tuple *other_tuple, *this_tuple;
const struct dst_entry *dst_cache;
unsigned char ha[ETH_ALEN];
struct neighbour *n;
const void *daddr;
u32 mask, val;
u8 nud_state;
u16 val16;
dst_cache = flow->tuplehash[dir].tuple.dst_cache;
n = dst_neigh_lookup(dst_cache, daddr);
if (!n)
return -ENOENT;
this_tuple = &flow->tuplehash[dir].tuple;
read_lock_bh(&n->lock);
nud_state = n->nud_state;
ether_addr_copy(ha, n->ha);
read_unlock_bh(&n->lock);
switch (this_tuple->xmit_type) {
case FLOW_OFFLOAD_XMIT_DIRECT:
ether_addr_copy(ha, this_tuple->out.h_dest);
break;
case FLOW_OFFLOAD_XMIT_NEIGH:
other_tuple = &flow->tuplehash[!dir].tuple;
daddr = &other_tuple->src_v4;
dst_cache = this_tuple->dst_cache;
n = dst_neigh_lookup(dst_cache, daddr);
if (!n)
return -ENOENT;
if (!(nud_state & NUD_VALID)) {
read_lock_bh(&n->lock);
nud_state = n->nud_state;
ether_addr_copy(ha, n->ha);
read_unlock_bh(&n->lock);
neigh_release(n);
return -ENOENT;
if (!(nud_state & NUD_VALID))
return -ENOENT;
break;
default:
return -EOPNOTSUPP;
}
mask = ~0xffffffff;
@ -243,7 +273,6 @@ static int flow_offload_eth_dst(struct net *net,
val = val16;
flow_offload_mangle(entry1, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 4,
&val, &mask);
neigh_release(n);
return 0;
}
@ -465,27 +494,52 @@ static void flow_offload_ipv4_checksum(struct net *net,
}
}
static void flow_offload_redirect(const struct flow_offload *flow,
static void flow_offload_redirect(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
struct flow_action_entry *entry = flow_action_entry_next(flow_rule);
struct rtable *rt;
const struct flow_offload_tuple *this_tuple, *other_tuple;
struct flow_action_entry *entry;
struct net_device *dev;
int ifindex;
rt = (struct rtable *)flow->tuplehash[dir].tuple.dst_cache;
this_tuple = &flow->tuplehash[dir].tuple;
switch (this_tuple->xmit_type) {
case FLOW_OFFLOAD_XMIT_DIRECT:
this_tuple = &flow->tuplehash[dir].tuple;
ifindex = this_tuple->out.ifidx;
break;
case FLOW_OFFLOAD_XMIT_NEIGH:
other_tuple = &flow->tuplehash[!dir].tuple;
ifindex = other_tuple->iifidx;
break;
default:
return;
}
dev = dev_get_by_index(net, ifindex);
if (!dev)
return;
entry = flow_action_entry_next(flow_rule);
entry->id = FLOW_ACTION_REDIRECT;
entry->dev = rt->dst.dev;
dev_hold(rt->dst.dev);
entry->dev = dev;
}
static void flow_offload_encap_tunnel(const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
const struct flow_offload_tuple *this_tuple;
struct flow_action_entry *entry;
struct dst_entry *dst;
dst = flow->tuplehash[dir].tuple.dst_cache;
this_tuple = &flow->tuplehash[dir].tuple;
if (this_tuple->xmit_type == FLOW_OFFLOAD_XMIT_DIRECT)
return;
dst = this_tuple->dst_cache;
if (dst && dst->lwtstate) {
struct ip_tunnel_info *tun_info;
@ -502,10 +556,15 @@ static void flow_offload_decap_tunnel(const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
const struct flow_offload_tuple *other_tuple;
struct flow_action_entry *entry;
struct dst_entry *dst;
dst = flow->tuplehash[!dir].tuple.dst_cache;
other_tuple = &flow->tuplehash[!dir].tuple;
if (other_tuple->xmit_type == FLOW_OFFLOAD_XMIT_DIRECT)
return;
dst = other_tuple->dst_cache;
if (dst && dst->lwtstate) {
struct ip_tunnel_info *tun_info;
@ -517,10 +576,14 @@ static void flow_offload_decap_tunnel(const struct flow_offload *flow,
}
}
int nf_flow_rule_route_ipv4(struct net *net, const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
static int
nf_flow_rule_route_common(struct net *net, const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
const struct flow_offload_tuple *other_tuple;
int i;
flow_offload_decap_tunnel(flow, dir, flow_rule);
flow_offload_encap_tunnel(flow, dir, flow_rule);
@ -528,6 +591,26 @@ int nf_flow_rule_route_ipv4(struct net *net, const struct flow_offload *flow,
flow_offload_eth_dst(net, flow, dir, flow_rule) < 0)
return -1;
other_tuple = &flow->tuplehash[!dir].tuple;
for (i = 0; i < other_tuple->encap_num; i++) {
struct flow_action_entry *entry = flow_action_entry_next(flow_rule);
entry->id = FLOW_ACTION_VLAN_PUSH;
entry->vlan.vid = other_tuple->encap[i].id;
entry->vlan.proto = other_tuple->encap[i].proto;
}
return 0;
}
int nf_flow_rule_route_ipv4(struct net *net, const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
if (nf_flow_rule_route_common(net, flow, dir, flow_rule) < 0)
return -1;
if (test_bit(NF_FLOW_SNAT, &flow->flags)) {
flow_offload_ipv4_snat(net, flow, dir, flow_rule);
flow_offload_port_snat(net, flow, dir, flow_rule);
@ -540,7 +623,7 @@ int nf_flow_rule_route_ipv4(struct net *net, const struct flow_offload *flow,
test_bit(NF_FLOW_DNAT, &flow->flags))
flow_offload_ipv4_checksum(net, flow, flow_rule);
flow_offload_redirect(flow, dir, flow_rule);
flow_offload_redirect(net, flow, dir, flow_rule);
return 0;
}
@ -550,11 +633,7 @@ int nf_flow_rule_route_ipv6(struct net *net, const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
flow_offload_decap_tunnel(flow, dir, flow_rule);
flow_offload_encap_tunnel(flow, dir, flow_rule);
if (flow_offload_eth_src(net, flow, dir, flow_rule) < 0 ||
flow_offload_eth_dst(net, flow, dir, flow_rule) < 0)
if (nf_flow_rule_route_common(net, flow, dir, flow_rule) < 0)
return -1;
if (test_bit(NF_FLOW_SNAT, &flow->flags)) {
@ -566,7 +645,7 @@ int nf_flow_rule_route_ipv6(struct net *net, const struct flow_offload *flow,
flow_offload_port_dnat(net, flow, dir, flow_rule);
}
flow_offload_redirect(flow, dir, flow_rule);
flow_offload_redirect(net, flow, dir, flow_rule);
return 0;
}
@ -580,10 +659,10 @@ nf_flow_offload_rule_alloc(struct net *net,
enum flow_offload_tuple_dir dir)
{
const struct nf_flowtable *flowtable = offload->flowtable;
const struct flow_offload_tuple *tuple, *other_tuple;
const struct flow_offload *flow = offload->flow;
const struct flow_offload_tuple *tuple;
struct dst_entry *other_dst = NULL;
struct nf_flow_rule *flow_rule;
struct dst_entry *other_dst;
int err = -ENOMEM;
flow_rule = kzalloc(sizeof(*flow_rule), GFP_KERNEL);
@ -599,7 +678,10 @@ nf_flow_offload_rule_alloc(struct net *net,
flow_rule->rule->match.key = &flow_rule->match.key;
tuple = &flow->tuplehash[dir].tuple;
other_dst = flow->tuplehash[!dir].tuple.dst_cache;
other_tuple = &flow->tuplehash[!dir].tuple;
if (other_tuple->xmit_type == FLOW_OFFLOAD_XMIT_NEIGH)
other_dst = other_tuple->dst_cache;
err = nf_flow_rule_match(&flow_rule->match, tuple, other_dst);
if (err < 0)
goto err_flow_match;