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bpf: Fix bpf socket lookup from tc/xdp to respect socket VRF bindings

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When calling bpf_sk_lookup_tcp(), bpf_sk_lookup_udp() or
bpf_skc_lookup_tcp() from tc/xdp ingress, VRF socket bindings aren't
respoected, i.e. unbound sockets are returned, and bound sockets aren't
found.

VRF binding is determined by the sdif argument to sk_lookup(), however
when called from tc the IP SKB control block isn't initialized and thus
inet{,6}_sdif() always returns 0.

Fix by calculating sdif for the tc/xdp flows by observing the device's
l3 enslaved state.

The cg/sk_skb hooking points which are expected to support
inet{,6}_sdif() pass sdif=-1 which makes __bpf_skc_lookup() use the
existing logic.

Fixes: 6acc9b432e ("bpf: Add helper to retrieve socket in BPF")
Signed-off-by: Gilad Sever <gilad9366@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Reviewed-by: Eyal Birger <eyal.birger@gmail.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Cc: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/bpf/20230621104211.301902-4-gilad9366@gmail.com
This commit is contained in:
Gilad Sever 2023-06-21 13:42:10 +03:00 committed by Daniel Borkmann
parent 97fbfeb869
commit 9a5cb79762
2 changed files with 48 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/linux/netdevice.h
View File

@ -5090,6 +5090,15 @@ static inline bool netif_is_l3_slave(const struct net_device *dev)
return dev->priv_flags & IFF_L3MDEV_SLAVE;
}
static inline int dev_sdif(const struct net_device *dev)
{
#ifdef CONFIG_NET_L3_MASTER_DEV
if (netif_is_l3_slave(dev))
return dev->ifindex;
#endif
return 0;
}
static inline bool netif_is_bridge_master(const struct net_device *dev)
{
return dev->priv_flags & IFF_EBRIDGE;

69
net/core/filter.c
View File

@ -6568,12 +6568,11 @@ static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple,
static struct sock *
__bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id,
u64 flags)
u64 flags, int sdif)
{
struct sock *sk = NULL;
struct net *net;
u8 family;
int sdif;
if (len == sizeof(tuple->ipv4))
family = AF_INET;
@ -6585,10 +6584,12 @@ __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
if (unlikely(flags || !((s32)netns_id < 0 || netns_id <= S32_MAX)))
goto out;
if (family == AF_INET)
sdif = inet_sdif(skb);
else
sdif = inet6_sdif(skb);
if (sdif < 0) {
if (family == AF_INET)
sdif = inet_sdif(skb);
else
sdif = inet6_sdif(skb);
}
if ((s32)netns_id < 0) {
net = caller_net;
@ -6608,10 +6609,11 @@ out:
static struct sock *
__bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id,
u64 flags)
u64 flags, int sdif)
{
struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net,
ifindex, proto, netns_id, flags);
ifindex, proto, netns_id, flags,
sdif);
if (sk) {
struct sock *sk2 = sk_to_full_sk(sk);
@ -6651,7 +6653,7 @@ bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
}
return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto,
netns_id, flags);
netns_id, flags, -1);
}
static struct sock *
@ -6743,12 +6745,13 @@ static const struct bpf_func_proto bpf_sk_lookup_udp_proto = {
BPF_CALL_5(bpf_tc_skc_lookup_tcp, struct sk_buff *, skb,
struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
{
struct net *caller_net = dev_net(skb->dev);
int ifindex = skb->dev->ifindex;
struct net_device *dev = skb->dev;
int ifindex = dev->ifindex, sdif = dev_sdif(dev);
struct net *caller_net = dev_net(dev);
return (unsigned long)__bpf_skc_lookup(skb, tuple, len, caller_net,
ifindex, IPPROTO_TCP, netns_id,
flags);
flags, sdif);
}
static const struct bpf_func_proto bpf_tc_skc_lookup_tcp_proto = {
@ -6766,12 +6769,13 @@ static const struct bpf_func_proto bpf_tc_skc_lookup_tcp_proto = {
BPF_CALL_5(bpf_tc_sk_lookup_tcp, struct sk_buff *, skb,
struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
{
struct net *caller_net = dev_net(skb->dev);
int ifindex = skb->dev->ifindex;
struct net_device *dev = skb->dev;
int ifindex = dev->ifindex, sdif = dev_sdif(dev);
struct net *caller_net = dev_net(dev);
return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net,
ifindex, IPPROTO_TCP, netns_id,
flags);
flags, sdif);
}
static const struct bpf_func_proto bpf_tc_sk_lookup_tcp_proto = {
@ -6789,12 +6793,13 @@ static const struct bpf_func_proto bpf_tc_sk_lookup_tcp_proto = {
BPF_CALL_5(bpf_tc_sk_lookup_udp, struct sk_buff *, skb,
struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
{
struct net *caller_net = dev_net(skb->dev);
int ifindex = skb->dev->ifindex;
struct net_device *dev = skb->dev;
int ifindex = dev->ifindex, sdif = dev_sdif(dev);
struct net *caller_net = dev_net(dev);
return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net,
ifindex, IPPROTO_UDP, netns_id,
flags);
flags, sdif);
}
static const struct bpf_func_proto bpf_tc_sk_lookup_udp_proto = {
@ -6826,12 +6831,13 @@ static const struct bpf_func_proto bpf_sk_release_proto = {
BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx,
struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
{
struct net *caller_net = dev_net(ctx->rxq->dev);
int ifindex = ctx->rxq->dev->ifindex;
struct net_device *dev = ctx->rxq->dev;
int ifindex = dev->ifindex, sdif = dev_sdif(dev);
struct net *caller_net = dev_net(dev);
return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net,
ifindex, IPPROTO_UDP, netns_id,
flags);
flags, sdif);
}
static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = {
@ -6849,12 +6855,13 @@ static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = {
BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx,
struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
{
struct net *caller_net = dev_net(ctx->rxq->dev);
int ifindex = ctx->rxq->dev->ifindex;
struct net_device *dev = ctx->rxq->dev;
int ifindex = dev->ifindex, sdif = dev_sdif(dev);
struct net *caller_net = dev_net(dev);
return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net,
ifindex, IPPROTO_TCP, netns_id,
flags);
flags, sdif);
}
static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = {
@ -6872,12 +6879,13 @@ static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = {
BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx,
struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
{
struct net *caller_net = dev_net(ctx->rxq->dev);
int ifindex = ctx->rxq->dev->ifindex;
struct net_device *dev = ctx->rxq->dev;
int ifindex = dev->ifindex, sdif = dev_sdif(dev);
struct net *caller_net = dev_net(dev);
return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net,
ifindex, IPPROTO_TCP, netns_id,
flags);
flags, sdif);
}
static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = {
@ -6897,7 +6905,8 @@ BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx,
{
return (unsigned long)__bpf_skc_lookup(NULL, tuple, len,
sock_net(ctx->sk), 0,
IPPROTO_TCP, netns_id, flags);
IPPROTO_TCP, netns_id, flags,
-1);
}
static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = {
@ -6916,7 +6925,7 @@ BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx,
{
return (unsigned long)__bpf_sk_lookup(NULL, tuple, len,
sock_net(ctx->sk), 0, IPPROTO_TCP,
netns_id, flags);
netns_id, flags, -1);
}
static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = {
@ -6935,7 +6944,7 @@ BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx,
{
return (unsigned long)__bpf_sk_lookup(NULL, tuple, len,
sock_net(ctx->sk), 0, IPPROTO_UDP,
netns_id, flags);
netns_id, flags, -1);
}
static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = {