diff --git a/include/linux/netfilter/nfnetlink.h b/include/linux/netfilter/nfnetlink.h
index 4f68cd7141d2..28c74367e900 100644
--- a/include/linux/netfilter/nfnetlink.h
+++ b/include/linux/netfilter/nfnetlink.h
@@ -14,6 +14,9 @@ struct nfnl_callback {
int (*call_rcu)(struct sock *nl, struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const cda[]);
+ int (*call_batch)(struct sock *nl, struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ const struct nlattr * const cda[]);
const struct nla_policy *policy; /* netlink attribute policy */
const u_int16_t attr_count; /* number of nlattr's */
};
@@ -23,6 +26,8 @@ struct nfnetlink_subsystem {
__u8 subsys_id; /* nfnetlink subsystem ID */
__u8 cb_count; /* number of callbacks */
const struct nfnl_callback *cb; /* callback for individual types */
+ int (*commit)(struct sk_buff *skb);
+ int (*abort)(struct sk_buff *skb);
};
int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index d3272e943aac..975ad3c573c7 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -323,18 +323,39 @@ static inline void *nft_expr_priv(const struct nft_expr *expr)
* @list: used internally
* @rcu_head: used internally for rcu
* @handle: rule handle
+ * @genmask: generation mask
* @dlen: length of expression data
* @data: expression data
*/
struct nft_rule {
struct list_head list;
struct rcu_head rcu_head;
- u64 handle:48,
+ u64 handle:46,
+ genmask:2,
dlen:16;
unsigned char data[]
__attribute__((aligned(__alignof__(struct nft_expr))));
};
+/**
+ * struct nft_rule_trans - nf_tables rule update in transaction
+ *
+ * @list: used internally
+ * @rule: rule that needs to be updated
+ * @chain: chain that this rule belongs to
+ * @table: table for which this chain applies
+ * @nlh: netlink header of the message that contain this update
+ * @family: family expressesed as AF_*
+ */
+struct nft_rule_trans {
+ struct list_head list;
+ struct nft_rule *rule;
+ const struct nft_chain *chain;
+ const struct nft_table *table;
+ const struct nlmsghdr *nlh;
+ u8 family;
+};
+
static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
{
return (struct nft_expr *)&rule->data[0];
@@ -370,6 +391,7 @@ enum nft_chain_flags {
* @rules: list of rules in the chain
* @list: used internally
* @rcu_head: used internally
+ * @net: net namespace that this chain belongs to
* @handle: chain handle
* @flags: bitmask of enum nft_chain_flags
* @use: number of jump references to this chain
@@ -380,6 +402,7 @@ struct nft_chain {
struct list_head rules;
struct list_head list;
struct rcu_head rcu_head;
+ struct net *net;
u64 handle;
u8 flags;
u16 use;
diff --git a/include/net/netns/nftables.h b/include/net/netns/nftables.h
index a98b1c5d9913..08a4248a12b5 100644
--- a/include/net/netns/nftables.h
+++ b/include/net/netns/nftables.h
@@ -7,9 +7,12 @@ struct nft_af_info;
struct netns_nftables {
struct list_head af_info;
+ struct list_head commit_list;
struct nft_af_info *ipv4;
struct nft_af_info *ipv6;
struct nft_af_info *bridge;
+ u8 gencursor;
+ u8 genctr;
};
#endif
diff --git a/include/uapi/linux/netfilter/nfnetlink.h b/include/uapi/linux/netfilter/nfnetlink.h
index 288959404d54..596ddd45253c 100644
--- a/include/uapi/linux/netfilter/nfnetlink.h
+++ b/include/uapi/linux/netfilter/nfnetlink.h
@@ -57,4 +57,8 @@ struct nfgenmsg {
#define NFNL_SUBSYS_NFT_COMPAT 11
#define NFNL_SUBSYS_COUNT 12
+/* Reserved control nfnetlink messages */
+#define NFNL_MSG_BATCH_BEGIN NLMSG_MIN_TYPE
+#define NFNL_MSG_BATCH_END NLMSG_MIN_TYPE+1
+
#endif /* _UAPI_NFNETLINK_H */
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 0f140663ec71..79e1418a6043 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -978,6 +978,7 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
INIT_LIST_HEAD(&chain->rules);
chain->handle = nf_tables_alloc_handle(table);
+ chain->net = net;
nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
if (!(table->flags & NFT_TABLE_F_DORMANT) &&
@@ -1371,6 +1372,41 @@ static int nf_tables_rule_notify(const struct sk_buff *oskb,
return err;
}
+static inline bool
+nft_rule_is_active(struct net *net, const struct nft_rule *rule)
+{
+ return (rule->genmask & (1 << net->nft.gencursor)) == 0;
+}
+
+static inline int gencursor_next(struct net *net)
+{
+ return net->nft.gencursor+1 == 1 ? 1 : 0;
+}
+
+static inline int
+nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
+{
+ return (rule->genmask & (1 << gencursor_next(net))) == 0;
+}
+
+static inline void
+nft_rule_activate_next(struct net *net, struct nft_rule *rule)
+{
+ /* Now inactive, will be active in the future */
+ rule->genmask = (1 << net->nft.gencursor);
+}
+
+static inline void
+nft_rule_disactivate_next(struct net *net, struct nft_rule *rule)
+{
+ rule->genmask = (1 << gencursor_next(net));
+}
+
+static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
+{
+ rule->genmask = 0;
+}
+
static int nf_tables_dump_rules(struct sk_buff *skb,
struct netlink_callback *cb)
{
@@ -1382,6 +1418,8 @@ static int nf_tables_dump_rules(struct sk_buff *skb,
unsigned int idx = 0, s_idx = cb->args[0];
struct net *net = sock_net(skb->sk);
int family = nfmsg->nfgen_family;
+ u8 genctr = ACCESS_ONCE(net->nft.genctr);
+ u8 gencursor = ACCESS_ONCE(net->nft.gencursor);
list_for_each_entry(afi, &net->nft.af_info, list) {
if (family != NFPROTO_UNSPEC && family != afi->family)
@@ -1390,6 +1428,8 @@ static int nf_tables_dump_rules(struct sk_buff *skb,
list_for_each_entry(table, &afi->tables, list) {
list_for_each_entry(chain, &table->chains, list) {
list_for_each_entry(rule, &chain->rules, list) {
+ if (!nft_rule_is_active(net, rule))
+ goto cont;
if (idx < s_idx)
goto cont;
if (idx > s_idx)
@@ -1408,6 +1448,10 @@ static int nf_tables_dump_rules(struct sk_buff *skb,
}
}
done:
+ /* Invalidate this dump, a transition to the new generation happened */
+ if (gencursor != net->nft.gencursor || genctr != net->nft.genctr)
+ return -EBUSY;
+
cb->args[0] = idx;
return skb->len;
}
@@ -1492,6 +1536,25 @@ static void nf_tables_rule_destroy(struct nft_rule *rule)
static struct nft_expr_info *info;
+static struct nft_rule_trans *
+nf_tables_trans_add(struct nft_rule *rule, const struct nft_ctx *ctx)
+{
+ struct nft_rule_trans *rupd;
+
+ rupd = kmalloc(sizeof(struct nft_rule_trans), GFP_KERNEL);
+ if (rupd == NULL)
+ return NULL;
+
+ rupd->chain = ctx->chain;
+ rupd->table = ctx->table;
+ rupd->rule = rule;
+ rupd->family = ctx->afi->family;
+ rupd->nlh = ctx->nlh;
+ list_add_tail(&rupd->list, &ctx->net->nft.commit_list);
+
+ return rupd;
+}
+
static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const nla[])
@@ -1502,6 +1565,7 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
struct nft_table *table;
struct nft_chain *chain;
struct nft_rule *rule, *old_rule = NULL;
+ struct nft_rule_trans *repl = NULL;
struct nft_expr *expr;
struct nft_ctx ctx;
struct nlattr *tmp;
@@ -1576,6 +1640,8 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
if (rule == NULL)
goto err1;
+ nft_rule_activate_next(net, rule);
+
rule->handle = handle;
rule->dlen = size;
@@ -1589,8 +1655,18 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
}
if (nlh->nlmsg_flags & NLM_F_REPLACE) {
- list_replace_rcu(&old_rule->list, &rule->list);
- nf_tables_rule_destroy(old_rule);
+ if (nft_rule_is_active_next(net, old_rule)) {
+ repl = nf_tables_trans_add(old_rule, &ctx);
+ if (repl == NULL) {
+ err = -ENOMEM;
+ goto err2;
+ }
+ nft_rule_disactivate_next(net, old_rule);
+ list_add_tail(&rule->list, &old_rule->list);
+ } else {
+ err = -ENOENT;
+ goto err2;
+ }
} else if (nlh->nlmsg_flags & NLM_F_APPEND)
if (old_rule)
list_add_rcu(&rule->list, &old_rule->list);
@@ -1603,11 +1679,20 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
list_add_rcu(&rule->list, &chain->rules);
}
- nf_tables_rule_notify(skb, nlh, table, chain, rule, NFT_MSG_NEWRULE,
- nlh->nlmsg_flags & (NLM_F_APPEND | NLM_F_REPLACE),
- nfmsg->nfgen_family);
+ if (nf_tables_trans_add(rule, &ctx) == NULL) {
+ err = -ENOMEM;
+ goto err3;
+ }
return 0;
+err3:
+ list_del_rcu(&rule->list);
+ if (repl) {
+ list_del_rcu(&repl->rule->list);
+ list_del(&repl->list);
+ nft_rule_clear(net, repl->rule);
+ kfree(repl);
+ }
err2:
nf_tables_rule_destroy(rule);
err1:
@@ -1618,6 +1703,19 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
return err;
}
+static int
+nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
+{
+ /* You cannot delete the same rule twice */
+ if (nft_rule_is_active_next(ctx->net, rule)) {
+ if (nf_tables_trans_add(rule, ctx) == NULL)
+ return -ENOMEM;
+ nft_rule_disactivate_next(ctx->net, rule);
+ return 0;
+ }
+ return -ENOENT;
+}
+
static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const nla[])
@@ -1628,7 +1726,8 @@ static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
const struct nft_table *table;
struct nft_chain *chain;
struct nft_rule *rule, *tmp;
- int family = nfmsg->nfgen_family;
+ int family = nfmsg->nfgen_family, err = 0;
+ struct nft_ctx ctx;
afi = nf_tables_afinfo_lookup(net, family, false);
if (IS_ERR(afi))
@@ -1642,28 +1741,92 @@ static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(chain))
return PTR_ERR(chain);
+ nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
+
if (nla[NFTA_RULE_HANDLE]) {
rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
if (IS_ERR(rule))
return PTR_ERR(rule);
- /* List removal must be visible before destroying expressions */
- list_del_rcu(&rule->list);
-
- nf_tables_rule_notify(skb, nlh, table, chain, rule,
- NFT_MSG_DELRULE, 0, family);
- nf_tables_rule_destroy(rule);
+ err = nf_tables_delrule_one(&ctx, rule);
} else {
/* Remove all rules in this chain */
list_for_each_entry_safe(rule, tmp, &chain->rules, list) {
- list_del_rcu(&rule->list);
-
- nf_tables_rule_notify(skb, nlh, table, chain, rule,
- NFT_MSG_DELRULE, 0, family);
- nf_tables_rule_destroy(rule);
+ err = nf_tables_delrule_one(&ctx, rule);
+ if (err < 0)
+ break;
}
}
+ return err;
+}
+
+static int nf_tables_commit(struct sk_buff *skb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nft_rule_trans *rupd, *tmp;
+
+ /* Bump generation counter, invalidate any dump in progress */
+ net->nft.genctr++;
+
+ /* A new generation has just started */
+ net->nft.gencursor = gencursor_next(net);
+
+ /* Make sure all packets have left the previous generation before
+ * purging old rules.
+ */
+ synchronize_rcu();
+
+ list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
+ /* Delete this rule from the dirty list */
+ list_del(&rupd->list);
+
+ /* This rule was inactive in the past and just became active.
+ * Clear the next bit of the genmask since its meaning has
+ * changed, now it is the future.
+ */
+ if (nft_rule_is_active(net, rupd->rule)) {
+ nft_rule_clear(net, rupd->rule);
+ nf_tables_rule_notify(skb, rupd->nlh, rupd->table,
+ rupd->chain, rupd->rule,
+ NFT_MSG_NEWRULE, 0,
+ rupd->family);
+ kfree(rupd);
+ continue;
+ }
+
+ /* This rule is in the past, get rid of it */
+ list_del_rcu(&rupd->rule->list);
+ nf_tables_rule_notify(skb, rupd->nlh, rupd->table, rupd->chain,
+ rupd->rule, NFT_MSG_DELRULE, 0,
+ rupd->family);
+ nf_tables_rule_destroy(rupd->rule);
+ kfree(rupd);
+ }
+
+ return 0;
+}
+
+static int nf_tables_abort(struct sk_buff *skb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nft_rule_trans *rupd, *tmp;
+
+ list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
+ /* Delete all rules from the dirty list */
+ list_del(&rupd->list);
+
+ if (!nft_rule_is_active_next(net, rupd->rule)) {
+ nft_rule_clear(net, rupd->rule);
+ kfree(rupd);
+ continue;
+ }
+
+ /* This rule is inactive, get rid of it */
+ list_del_rcu(&rupd->rule->list);
+ nf_tables_rule_destroy(rupd->rule);
+ kfree(rupd);
+ }
return 0;
}
@@ -2634,7 +2797,7 @@ static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
.policy = nft_chain_policy,
},
[NFT_MSG_NEWRULE] = {
- .call = nf_tables_newrule,
+ .call_batch = nf_tables_newrule,
.attr_count = NFTA_RULE_MAX,
.policy = nft_rule_policy,
},
@@ -2644,7 +2807,7 @@ static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
.policy = nft_rule_policy,
},
[NFT_MSG_DELRULE] = {
- .call = nf_tables_delrule,
+ .call_batch = nf_tables_delrule,
.attr_count = NFTA_RULE_MAX,
.policy = nft_rule_policy,
},
@@ -2685,6 +2848,8 @@ static const struct nfnetlink_subsystem nf_tables_subsys = {
.subsys_id = NFNL_SUBSYS_NFTABLES,
.cb_count = NFT_MSG_MAX,
.cb = nf_tables_cb,
+ .commit = nf_tables_commit,
+ .abort = nf_tables_abort,
};
/*
@@ -3056,6 +3221,7 @@ EXPORT_SYMBOL_GPL(nft_data_dump);
static int nf_tables_init_net(struct net *net)
{
INIT_LIST_HEAD(&net->nft.af_info);
+ INIT_LIST_HEAD(&net->nft.commit_list);
return 0;
}
diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index 3c13007d80df..d581ef660248 100644
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -88,12 +88,22 @@ nft_do_chain_pktinfo(struct nft_pktinfo *pkt, const struct nf_hook_ops *ops)
struct nft_data data[NFT_REG_MAX + 1];
unsigned int stackptr = 0;
struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE];
+ /*
+ * Cache cursor to avoid problems in case that the cursor is updated
+ * while traversing the ruleset.
+ */
+ unsigned int gencursor = ACCESS_ONCE(chain->net->nft.gencursor);
do_chain:
rule = list_entry(&chain->rules, struct nft_rule, list);
next_rule:
data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
list_for_each_entry_continue_rcu(rule, &chain->rules, list) {
+
+ /* This rule is not active, skip. */
+ if (unlikely(rule->genmask & (1 << gencursor)))
+ continue;
+
nft_rule_for_each_expr(expr, last, rule) {
if (expr->ops == &nft_cmp_fast_ops)
nft_cmp_fast_eval(expr, data);
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 572d87dc116f..027f16af51a0 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -147,9 +147,6 @@ static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
const struct nfnetlink_subsystem *ss;
int type, err;
- if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
- return -EPERM;
-
/* All the messages must at least contain nfgenmsg */
if (nlmsg_len(nlh) < sizeof(struct nfgenmsg))
return 0;
@@ -217,9 +214,179 @@ static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
}
}
+static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
+ u_int16_t subsys_id)
+{
+ struct sk_buff *nskb, *oskb = skb;
+ struct net *net = sock_net(skb->sk);
+ const struct nfnetlink_subsystem *ss;
+ const struct nfnl_callback *nc;
+ bool success = true, done = false;
+ int err;
+
+ if (subsys_id >= NFNL_SUBSYS_COUNT)
+ return netlink_ack(skb, nlh, -EINVAL);
+replay:
+ nskb = netlink_skb_clone(oskb, GFP_KERNEL);
+ if (!nskb)
+ return netlink_ack(oskb, nlh, -ENOMEM);
+
+ nskb->sk = oskb->sk;
+ skb = nskb;
+
+ nfnl_lock(subsys_id);
+ ss = rcu_dereference_protected(table[subsys_id].subsys,
+ lockdep_is_held(&table[subsys_id].mutex));
+ if (!ss) {
+#ifdef CONFIG_MODULES
+ nfnl_unlock(subsys_id);
+ request_module("nfnetlink-subsys-%d", subsys_id);
+ nfnl_lock(subsys_id);
+ ss = rcu_dereference_protected(table[subsys_id].subsys,
+ lockdep_is_held(&table[subsys_id].mutex));
+ if (!ss)
+#endif
+ {
+ nfnl_unlock(subsys_id);
+ kfree_skb(nskb);
+ return netlink_ack(skb, nlh, -EOPNOTSUPP);
+ }
+ }
+
+ if (!ss->commit || !ss->abort) {
+ nfnl_unlock(subsys_id);
+ kfree_skb(nskb);
+ return netlink_ack(skb, nlh, -EOPNOTSUPP);
+ }
+
+ while (skb->len >= nlmsg_total_size(0)) {
+ int msglen, type;
+
+ nlh = nlmsg_hdr(skb);
+ err = 0;
+
+ if (nlh->nlmsg_len < NLMSG_HDRLEN) {
+ err = -EINVAL;
+ goto ack;
+ }
+
+ /* Only requests are handled by the kernel */
+ if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) {
+ err = -EINVAL;
+ goto ack;
+ }
+
+ type = nlh->nlmsg_type;
+ if (type == NFNL_MSG_BATCH_BEGIN) {
+ /* Malformed: Batch begin twice */
+ success = false;
+ goto done;
+ } else if (type == NFNL_MSG_BATCH_END) {
+ done = true;
+ goto done;
+ } else if (type < NLMSG_MIN_TYPE) {
+ err = -EINVAL;
+ goto ack;
+ }
+
+ /* We only accept a batch with messages for the same
+ * subsystem.
+ */
+ if (NFNL_SUBSYS_ID(type) != subsys_id) {
+ err = -EINVAL;
+ goto ack;
+ }
+
+ nc = nfnetlink_find_client(type, ss);
+ if (!nc) {
+ err = -EINVAL;
+ goto ack;
+ }
+
+ {
+ int min_len = nlmsg_total_size(sizeof(struct nfgenmsg));
+ u_int8_t cb_id = NFNL_MSG_TYPE(nlh->nlmsg_type);
+ struct nlattr *cda[ss->cb[cb_id].attr_count + 1];
+ struct nlattr *attr = (void *)nlh + min_len;
+ int attrlen = nlh->nlmsg_len - min_len;
+
+ err = nla_parse(cda, ss->cb[cb_id].attr_count,
+ attr, attrlen, ss->cb[cb_id].policy);
+ if (err < 0)
+ goto ack;
+
+ if (nc->call_batch) {
+ err = nc->call_batch(net->nfnl, skb, nlh,
+ (const struct nlattr **)cda);
+ }
+
+ /* The lock was released to autoload some module, we
+ * have to abort and start from scratch using the
+ * original skb.
+ */
+ if (err == -EAGAIN) {
+ ss->abort(skb);
+ nfnl_unlock(subsys_id);
+ kfree_skb(nskb);
+ goto replay;
+ }
+ }
+ack:
+ if (nlh->nlmsg_flags & NLM_F_ACK || err) {
+ /* We don't stop processing the batch on errors, thus,
+ * userspace gets all the errors that the batch
+ * triggers.
+ */
+ netlink_ack(skb, nlh, err);
+ if (err)
+ success = false;
+ }
+
+ msglen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (msglen > skb->len)
+ msglen = skb->len;
+ skb_pull(skb, msglen);
+ }
+done:
+ if (success && done)
+ ss->commit(skb);
+ else
+ ss->abort(skb);
+
+ nfnl_unlock(subsys_id);
+ kfree_skb(nskb);
+}
+
static void nfnetlink_rcv(struct sk_buff *skb)
{
- netlink_rcv_skb(skb, &nfnetlink_rcv_msg);
+ struct nlmsghdr *nlh = nlmsg_hdr(skb);
+ struct net *net = sock_net(skb->sk);
+ int msglen;
+
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return netlink_ack(skb, nlh, -EPERM);
+
+ if (nlh->nlmsg_len < NLMSG_HDRLEN ||
+ skb->len < nlh->nlmsg_len)
+ return;
+
+ if (nlh->nlmsg_type == NFNL_MSG_BATCH_BEGIN) {
+ struct nfgenmsg *nfgenmsg;
+
+ msglen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (msglen > skb->len)
+ msglen = skb->len;
+
+ if (nlh->nlmsg_len < NLMSG_HDRLEN ||
+ skb->len < NLMSG_HDRLEN + sizeof(struct nfgenmsg))
+ return;
+
+ nfgenmsg = nlmsg_data(nlh);
+ skb_pull(skb, msglen);
+ nfnetlink_rcv_batch(skb, nlh, nfgenmsg->res_id);
+ } else {
+ netlink_rcv_skb(skb, &nfnetlink_rcv_msg);
+ }
}
#ifdef CONFIG_MODULES