Commit c4b0e771 authored by Florian Westphal's avatar Florian Westphal Committed by David S. Miller
Browse files

netfilter: avoid using skb->nf_bridge directly



This pointer is going to be removed soon, so use the existing helpers in
more places to avoid noise when the removal happens.

Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8239d579
......@@ -17,43 +17,58 @@ static inline void br_drop_fake_rtable(struct sk_buff *skb)
skb_dst_drop(skb);
}
static inline struct nf_bridge_info *
nf_bridge_info_get(const struct sk_buff *skb)
{
return skb->nf_bridge;
}
static inline bool nf_bridge_info_exists(const struct sk_buff *skb)
{
return skb->nf_bridge != NULL;
}
static inline int nf_bridge_get_physinif(const struct sk_buff *skb)
{
struct nf_bridge_info *nf_bridge;
const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
if (skb->nf_bridge == NULL)
if (!nf_bridge)
return 0;
nf_bridge = skb->nf_bridge;
return nf_bridge->physindev ? nf_bridge->physindev->ifindex : 0;
}
static inline int nf_bridge_get_physoutif(const struct sk_buff *skb)
{
struct nf_bridge_info *nf_bridge;
const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
if (skb->nf_bridge == NULL)
if (!nf_bridge)
return 0;
nf_bridge = skb->nf_bridge;
return nf_bridge->physoutdev ? nf_bridge->physoutdev->ifindex : 0;
}
static inline struct net_device *
nf_bridge_get_physindev(const struct sk_buff *skb)
{
return skb->nf_bridge ? skb->nf_bridge->physindev : NULL;
const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
return nf_bridge ? nf_bridge->physindev : NULL;
}
static inline struct net_device *
nf_bridge_get_physoutdev(const struct sk_buff *skb)
{
return skb->nf_bridge ? skb->nf_bridge->physoutdev : NULL;
const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
return nf_bridge ? nf_bridge->physoutdev : NULL;
}
static inline bool nf_bridge_in_prerouting(const struct sk_buff *skb)
{
return skb->nf_bridge && skb->nf_bridge->in_prerouting;
const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
return nf_bridge && nf_bridge->in_prerouting;
}
#else
#define br_drop_fake_rtable(skb) do { } while (0)
......
......@@ -22,12 +22,6 @@ int br_nf_hook_thresh(unsigned int hook, struct net *net, struct sock *sk,
int (*okfn)(struct net *, struct sock *,
struct sk_buff *));
static inline struct nf_bridge_info *
nf_bridge_info_get(const struct sk_buff *skb)
{
return skb->nf_bridge;
}
unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb);
static inline void nf_bridge_push_encap_header(struct sk_buff *skb)
......
......@@ -247,7 +247,9 @@ drop:
void nf_bridge_update_protocol(struct sk_buff *skb)
{
switch (skb->nf_bridge->orig_proto) {
const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
switch (nf_bridge->orig_proto) {
case BRNF_PROTO_8021Q:
skb->protocol = htons(ETH_P_8021Q);
break;
......@@ -569,7 +571,8 @@ static unsigned int br_nf_forward_ip(void *priv,
struct net_device *parent;
u_int8_t pf;
if (!skb->nf_bridge)
nf_bridge = nf_bridge_info_get(skb);
if (!nf_bridge)
return NF_ACCEPT;
/* Need exclusive nf_bridge_info since we might have multiple
......@@ -701,7 +704,9 @@ br_nf_ip_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
static unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
{
if (skb->nf_bridge->orig_proto == BRNF_PROTO_PPPOE)
const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
if (nf_bridge->orig_proto == BRNF_PROTO_PPPOE)
return PPPOE_SES_HLEN;
return 0;
}
......@@ -839,7 +844,9 @@ static unsigned int ip_sabotage_in(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
if (skb->nf_bridge && !skb->nf_bridge->in_prerouting &&
struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
if (nf_bridge && !nf_bridge->in_prerouting &&
!netif_is_l3_master(skb->dev)) {
state->okfn(state->net, state->sk, skb);
return NF_STOLEN;
......@@ -877,7 +884,9 @@ static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
static int br_nf_dev_xmit(struct sk_buff *skb)
{
if (skb->nf_bridge && skb->nf_bridge->bridged_dnat) {
const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
if (nf_bridge && nf_bridge->bridged_dnat) {
br_nf_pre_routing_finish_bridge_slow(skb);
return 1;
}
......
......@@ -102,6 +102,7 @@ EXPORT_SYMBOL_GPL(nf_reject_ip_tcphdr_put);
/* Send RST reply */
void nf_send_reset(struct net *net, struct sk_buff *oldskb, int hook)
{
struct net_device *br_indev __maybe_unused;
struct sk_buff *nskb;
struct iphdr *niph;
const struct tcphdr *oth;
......@@ -147,10 +148,11 @@ void nf_send_reset(struct net *net, struct sk_buff *oldskb, int hook)
* build the eth header using the original destination's MAC as the
* source, and send the RST packet directly.
*/
if (oldskb->nf_bridge) {
br_indev = nf_bridge_get_physindev(oldskb);
if (br_indev) {
struct ethhdr *oeth = eth_hdr(oldskb);
nskb->dev = nf_bridge_get_physindev(oldskb);
nskb->dev = br_indev;
niph->tot_len = htons(nskb->len);
ip_send_check(niph);
if (dev_hard_header(nskb, nskb->dev, ntohs(nskb->protocol),
......
......@@ -131,6 +131,7 @@ EXPORT_SYMBOL_GPL(nf_reject_ip6_tcphdr_put);
void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
{
struct net_device *br_indev __maybe_unused;
struct sk_buff *nskb;
struct tcphdr _otcph;
const struct tcphdr *otcph;
......@@ -197,15 +198,18 @@ void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
* build the eth header using the original destination's MAC as the
* source, and send the RST packet directly.
*/
if (oldskb->nf_bridge) {
br_indev = nf_bridge_get_physindev(oldskb);
if (br_indev) {
struct ethhdr *oeth = eth_hdr(oldskb);
nskb->dev = nf_bridge_get_physindev(oldskb);
nskb->dev = br_indev;
nskb->protocol = htons(ETH_P_IPV6);
ip6h->payload_len = htons(sizeof(struct tcphdr));
if (dev_hard_header(nskb, nskb->dev, ntohs(nskb->protocol),
oeth->h_source, oeth->h_dest, nskb->len) < 0)
oeth->h_source, oeth->h_dest, nskb->len) < 0) {
kfree_skb(nskb);
return;
}
dev_queue_xmit(nskb);
} else
#endif
......
......@@ -156,22 +156,20 @@ nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf,
const struct net_device *out,
const struct nf_loginfo *loginfo, const char *prefix)
{
const struct net_device *physoutdev __maybe_unused;
const struct net_device *physindev __maybe_unused;
nf_log_buf_add(m, KERN_SOH "%c%sIN=%s OUT=%s ",
'0' + loginfo->u.log.level, prefix,
in ? in->name : "",
out ? out->name : "");
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (skb->nf_bridge) {
const struct net_device *physindev;
const struct net_device *physoutdev;
physindev = nf_bridge_get_physindev(skb);
if (physindev && in != physindev)
nf_log_buf_add(m, "PHYSIN=%s ", physindev->name);
physoutdev = nf_bridge_get_physoutdev(skb);
if (physoutdev && out != physoutdev)
nf_log_buf_add(m, "PHYSOUT=%s ", physoutdev->name);
}
physindev = nf_bridge_get_physindev(skb);
if (physindev && in != physindev)
nf_log_buf_add(m, "PHYSIN=%s ", physindev->name);
physoutdev = nf_bridge_get_physoutdev(skb);
if (physoutdev && out != physoutdev)
nf_log_buf_add(m, "PHYSOUT=%s ", physoutdev->name);
#endif
}
EXPORT_SYMBOL_GPL(nf_log_dump_packet_common);
......
......@@ -46,6 +46,24 @@ void nf_unregister_queue_handler(struct net *net)
}
EXPORT_SYMBOL(nf_unregister_queue_handler);
static void nf_queue_entry_release_br_nf_refs(struct sk_buff *skb)
{
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
if (nf_bridge) {
struct net_device *physdev;
physdev = nf_bridge_get_physindev(skb);
if (physdev)
dev_put(physdev);
physdev = nf_bridge_get_physoutdev(skb);
if (physdev)
dev_put(physdev);
}
#endif
}
void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
{
struct nf_hook_state *state = &entry->state;
......@@ -57,20 +75,28 @@ void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
dev_put(state->out);
if (state->sk)
sock_put(state->sk);
nf_queue_entry_release_br_nf_refs(entry->skb);
}
EXPORT_SYMBOL_GPL(nf_queue_entry_release_refs);
static void nf_queue_entry_get_br_nf_refs(struct sk_buff *skb)
{
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (entry->skb->nf_bridge) {
struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
if (nf_bridge) {
struct net_device *physdev;
physdev = nf_bridge_get_physindev(entry->skb);
physdev = nf_bridge_get_physindev(skb);
if (physdev)
dev_put(physdev);
physdev = nf_bridge_get_physoutdev(entry->skb);
dev_hold(physdev);
physdev = nf_bridge_get_physoutdev(skb);
if (physdev)
dev_put(physdev);
dev_hold(physdev);
}
#endif
}
EXPORT_SYMBOL_GPL(nf_queue_entry_release_refs);
/* Bump dev refs so they don't vanish while packet is out */
void nf_queue_entry_get_refs(struct nf_queue_entry *entry)
......@@ -83,18 +109,8 @@ void nf_queue_entry_get_refs(struct nf_queue_entry *entry)
dev_hold(state->out);
if (state->sk)
sock_hold(state->sk);
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (entry->skb->nf_bridge) {
struct net_device *physdev;
physdev = nf_bridge_get_physindev(entry->skb);
if (physdev)
dev_hold(physdev);
physdev = nf_bridge_get_physoutdev(entry->skb);
if (physdev)
dev_hold(physdev);
}
#endif
nf_queue_entry_get_br_nf_refs(entry->skb);
}
EXPORT_SYMBOL_GPL(nf_queue_entry_get_refs);
......
......@@ -727,13 +727,13 @@ nf_queue_entry_dup(struct nf_queue_entry *e)
*/
static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
{
if (skb->nf_bridge)
if (nf_bridge_info_get(skb))
__skb_push(skb, skb->network_header - skb->mac_header);
}
static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
{
if (skb->nf_bridge)
if (nf_bridge_info_get(skb))
__skb_pull(skb, skb->network_header - skb->mac_header);
}
#else
......@@ -904,23 +904,22 @@ nfqnl_set_mode(struct nfqnl_instance *queue,
static int
dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
{
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
int physinif, physoutif;
physinif = nf_bridge_get_physinif(entry->skb);
physoutif = nf_bridge_get_physoutif(entry->skb);
if (physinif == ifindex || physoutif == ifindex)
return 1;
#endif
if (entry->state.in)
if (entry->state.in->ifindex == ifindex)
return 1;
if (entry->state.out)
if (entry->state.out->ifindex == ifindex)
return 1;
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (entry->skb->nf_bridge) {
int physinif, physoutif;
physinif = nf_bridge_get_physinif(entry->skb);
physoutif = nf_bridge_get_physoutif(entry->skb);
if (physinif == ifindex || physoutif == ifindex)
return 1;
}
#endif
return 0;
}
......
......@@ -33,7 +33,7 @@ physdev_mt(const struct sk_buff *skb, struct xt_action_param *par)
/* Not a bridged IP packet or no info available yet:
* LOCAL_OUT/mangle and LOCAL_OUT/nat don't know if
* the destination device will be a bridge. */
if (!skb->nf_bridge) {
if (!nf_bridge_info_exists(skb)) {
/* Return MATCH if the invert flags of the used options are on */
if ((info->bitmask & XT_PHYSDEV_OP_BRIDGED) &&
!(info->invert & XT_PHYSDEV_OP_BRIDGED))
......
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