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path: root/net/netfilter/nf_tables_core.c
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Diffstat (limited to 'net/netfilter/nf_tables_core.c')
-rw-r--r--net/netfilter/nf_tables_core.c156
1 files changed, 121 insertions, 35 deletions
diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index 96c74c4c7176..cee3e4e905ec 100644
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -25,9 +25,7 @@ static noinline void __nft_trace_packet(struct nft_traceinfo *info,
const struct nft_chain *chain,
enum nft_trace_types type)
{
- const struct nft_pktinfo *pkt = info->pkt;
-
- if (!info->trace || !pkt->skb->nf_trace)
+ if (!info->trace || !info->nf_trace)
return;
info->chain = chain;
@@ -36,28 +34,99 @@ static noinline void __nft_trace_packet(struct nft_traceinfo *info,
nft_trace_notify(info);
}
-static inline void nft_trace_packet(struct nft_traceinfo *info,
+static inline void nft_trace_packet(const struct nft_pktinfo *pkt,
+ struct nft_traceinfo *info,
const struct nft_chain *chain,
- const struct nft_rule *rule,
+ const struct nft_rule_dp *rule,
enum nft_trace_types type)
{
if (static_branch_unlikely(&nft_trace_enabled)) {
+ info->nf_trace = pkt->skb->nf_trace;
info->rule = rule;
__nft_trace_packet(info, chain, type);
}
}
+static inline void nft_trace_copy_nftrace(const struct nft_pktinfo *pkt,
+ struct nft_traceinfo *info)
+{
+ if (static_branch_unlikely(&nft_trace_enabled)) {
+ if (info->trace)
+ info->nf_trace = pkt->skb->nf_trace;
+ }
+}
+
+static void nft_bitwise_fast_eval(const struct nft_expr *expr,
+ struct nft_regs *regs)
+{
+ const struct nft_bitwise_fast_expr *priv = nft_expr_priv(expr);
+ u32 *src = &regs->data[priv->sreg];
+ u32 *dst = &regs->data[priv->dreg];
+
+ *dst = (*src & priv->mask) ^ priv->xor;
+}
+
static void nft_cmp_fast_eval(const struct nft_expr *expr,
struct nft_regs *regs)
{
const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
- u32 mask = nft_cmp_fast_mask(priv->len);
- if ((regs->data[priv->sreg] & mask) == priv->data)
+ if (((regs->data[priv->sreg] & priv->mask) == priv->data) ^ priv->inv)
return;
regs->verdict.code = NFT_BREAK;
}
+static void nft_cmp16_fast_eval(const struct nft_expr *expr,
+ struct nft_regs *regs)
+{
+ const struct nft_cmp16_fast_expr *priv = nft_expr_priv(expr);
+ const u64 *reg_data = (const u64 *)&regs->data[priv->sreg];
+ const u64 *mask = (const u64 *)&priv->mask;
+ const u64 *data = (const u64 *)&priv->data;
+
+ if (((reg_data[0] & mask[0]) == data[0] &&
+ ((reg_data[1] & mask[1]) == data[1])) ^ priv->inv)
+ return;
+ regs->verdict.code = NFT_BREAK;
+}
+
+static noinline void __nft_trace_verdict(struct nft_traceinfo *info,
+ const struct nft_chain *chain,
+ const struct nft_regs *regs)
+{
+ enum nft_trace_types type;
+
+ switch (regs->verdict.code) {
+ case NFT_CONTINUE:
+ case NFT_RETURN:
+ type = NFT_TRACETYPE_RETURN;
+ break;
+ case NF_STOLEN:
+ type = NFT_TRACETYPE_RULE;
+ /* can't access skb->nf_trace; use copy */
+ break;
+ default:
+ type = NFT_TRACETYPE_RULE;
+
+ if (info->trace)
+ info->nf_trace = info->pkt->skb->nf_trace;
+ break;
+ }
+
+ __nft_trace_packet(info, chain, type);
+}
+
+static inline void nft_trace_verdict(struct nft_traceinfo *info,
+ const struct nft_chain *chain,
+ const struct nft_rule_dp *rule,
+ const struct nft_regs *regs)
+{
+ if (static_branch_unlikely(&nft_trace_enabled)) {
+ info->rule = rule;
+ __nft_trace_verdict(info, chain, regs);
+ }
+}
+
static bool nft_payload_fast_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
@@ -70,9 +139,9 @@ static bool nft_payload_fast_eval(const struct nft_expr *expr,
if (priv->base == NFT_PAYLOAD_NETWORK_HEADER)
ptr = skb_network_header(skb);
else {
- if (!pkt->tprot_set)
+ if (!(pkt->flags & NFT_PKTINFO_L4PROTO))
return false;
- ptr = skb_network_header(skb) + pkt->xt.thoff;
+ ptr = skb_network_header(skb) + nft_thoff(pkt);
}
ptr += priv->offset;
@@ -101,7 +170,6 @@ static noinline void nft_update_chain_stats(const struct nft_chain *chain,
base_chain = nft_base_chain(chain);
- rcu_read_lock();
pstats = READ_ONCE(base_chain->stats);
if (pstats) {
local_bh_disable();
@@ -112,12 +180,12 @@ static noinline void nft_update_chain_stats(const struct nft_chain *chain,
u64_stats_update_end(&stats->syncp);
local_bh_enable();
}
- rcu_read_unlock();
}
struct nft_jumpstack {
- const struct nft_chain *chain;
- struct nft_rule *const *rules;
+ const struct nft_chain *chain;
+ const struct nft_rule_dp *rule;
+ const struct nft_rule_dp *last_rule;
};
static void expr_call_ops_eval(const struct nft_expr *expr,
@@ -132,6 +200,7 @@ static void expr_call_ops_eval(const struct nft_expr *expr,
X(e, nft_payload_eval);
X(e, nft_cmp_eval);
+ X(e, nft_counter_eval);
X(e, nft_meta_get_eval);
X(e, nft_lookup_eval);
X(e, nft_range_eval);
@@ -145,18 +214,28 @@ static void expr_call_ops_eval(const struct nft_expr *expr,
expr->ops->eval(expr, regs, pkt);
}
+#define nft_rule_expr_first(rule) (struct nft_expr *)&rule->data[0]
+#define nft_rule_expr_next(expr) ((void *)expr) + expr->ops->size
+#define nft_rule_expr_last(rule) (struct nft_expr *)&rule->data[rule->dlen]
+#define nft_rule_next(rule) (void *)rule + sizeof(*rule) + rule->dlen
+
+#define nft_rule_dp_for_each_expr(expr, last, rule) \
+ for ((expr) = nft_rule_expr_first(rule), (last) = nft_rule_expr_last(rule); \
+ (expr) != (last); \
+ (expr) = nft_rule_expr_next(expr))
+
unsigned int
nft_do_chain(struct nft_pktinfo *pkt, void *priv)
{
const struct nft_chain *chain = priv, *basechain = chain;
+ const struct nft_rule_dp *rule, *last_rule;
const struct net *net = nft_net(pkt);
- struct nft_rule *const *rules;
- const struct nft_rule *rule;
const struct nft_expr *expr, *last;
- struct nft_regs regs;
+ struct nft_regs regs = {};
unsigned int stackptr = 0;
struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE];
bool genbit = READ_ONCE(net->nft.gencursor);
+ struct nft_rule_blob *blob;
struct nft_traceinfo info;
info.trace = false;
@@ -164,18 +243,22 @@ nft_do_chain(struct nft_pktinfo *pkt, void *priv)
nft_trace_init(&info, pkt, &regs.verdict, basechain);
do_chain:
if (genbit)
- rules = rcu_dereference(chain->rules_gen_1);
+ blob = rcu_dereference(chain->blob_gen_1);
else
- rules = rcu_dereference(chain->rules_gen_0);
+ blob = rcu_dereference(chain->blob_gen_0);
+ rule = (struct nft_rule_dp *)blob->data;
+ last_rule = (void *)blob->data + blob->size;
next_rule:
- rule = *rules;
regs.verdict.code = NFT_CONTINUE;
- for (; *rules ; rules++) {
- rule = *rules;
- nft_rule_for_each_expr(expr, last, rule) {
+ for (; rule < last_rule; rule = nft_rule_next(rule)) {
+ nft_rule_dp_for_each_expr(expr, last, rule) {
if (expr->ops == &nft_cmp_fast_ops)
nft_cmp_fast_eval(expr, &regs);
+ else if (expr->ops == &nft_cmp16_fast_ops)
+ nft_cmp16_fast_eval(expr, &regs);
+ else if (expr->ops == &nft_bitwise_fast_ops)
+ nft_bitwise_fast_eval(expr, &regs);
else if (expr->ops != &nft_payload_fast_ops ||
!nft_payload_fast_eval(expr, &regs, pkt))
expr_call_ops_eval(expr, &regs, pkt);
@@ -187,22 +270,23 @@ next_rule:
switch (regs.verdict.code) {
case NFT_BREAK:
regs.verdict.code = NFT_CONTINUE;
+ nft_trace_copy_nftrace(pkt, &info);
continue;
case NFT_CONTINUE:
- nft_trace_packet(&info, chain, rule,
+ nft_trace_packet(pkt, &info, chain, rule,
NFT_TRACETYPE_RULE);
continue;
}
break;
}
+ nft_trace_verdict(&info, chain, rule, &regs);
+
switch (regs.verdict.code & NF_VERDICT_MASK) {
case NF_ACCEPT:
case NF_DROP:
case NF_QUEUE:
case NF_STOLEN:
- nft_trace_packet(&info, chain, rule,
- NFT_TRACETYPE_RULE);
return regs.verdict.code;
}
@@ -211,32 +295,29 @@ next_rule:
if (WARN_ON_ONCE(stackptr >= NFT_JUMP_STACK_SIZE))
return NF_DROP;
jumpstack[stackptr].chain = chain;
- jumpstack[stackptr].rules = rules + 1;
+ jumpstack[stackptr].rule = nft_rule_next(rule);
+ jumpstack[stackptr].last_rule = last_rule;
stackptr++;
- /* fall through */
+ fallthrough;
case NFT_GOTO:
- nft_trace_packet(&info, chain, rule,
- NFT_TRACETYPE_RULE);
-
chain = regs.verdict.chain;
goto do_chain;
case NFT_CONTINUE:
case NFT_RETURN:
- nft_trace_packet(&info, chain, rule,
- NFT_TRACETYPE_RETURN);
break;
default:
- WARN_ON(1);
+ WARN_ON_ONCE(1);
}
if (stackptr > 0) {
stackptr--;
chain = jumpstack[stackptr].chain;
- rules = jumpstack[stackptr].rules;
+ rule = jumpstack[stackptr].rule;
+ last_rule = jumpstack[stackptr].last_rule;
goto next_rule;
}
- nft_trace_packet(&info, basechain, NULL, NFT_TRACETYPE_POLICY);
+ nft_trace_packet(pkt, &info, basechain, NULL, NFT_TRACETYPE_POLICY);
if (static_branch_unlikely(&nft_counters_enabled))
nft_update_chain_stats(basechain, pkt);
@@ -257,18 +338,23 @@ static struct nft_expr_type *nft_basic_types[] = {
&nft_meta_type,
&nft_rt_type,
&nft_exthdr_type,
+ &nft_last_type,
+ &nft_counter_type,
};
static struct nft_object_type *nft_basic_objects[] = {
#ifdef CONFIG_NETWORK_SECMARK
&nft_secmark_obj_type,
#endif
+ &nft_counter_obj_type,
};
int __init nf_tables_core_module_init(void)
{
int err, i, j = 0;
+ nft_counter_init_seqcount();
+
for (i = 0; i < ARRAY_SIZE(nft_basic_objects); i++) {
err = nft_register_obj(nft_basic_objects[i]);
if (err)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.