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Use skb_copy_bits instead of skb_linearize

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Encountered noticeable issues in performance caused by skb_linearize
This commit is contained in:
Vadim Vetrov
2025-01-09 18:30:23 +03:00
parent 9b58869864
commit 6393c11960
1 changed files with 34 additions and 22 deletions
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56
src/kytunblock.c
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@@ -385,11 +385,11 @@ static int conntrack_parse(const struct sk_buff *skb,
#endif /* RHEL or not RHEL */ #endif /* RHEL or not RHEL */
static NF_CALLBACK(ykb_nf_hook, skb) { static NF_CALLBACK(ykb_nf_hook, skb) {
int ret; int ret;
struct packet_data pd = {0}; struct packet_data pd = {0};
uint8_t *data_buf = NULL;
int nf_verdict = NF_ACCEPT;
spin_lock(&hot_config_spinlock); spin_lock(&hot_config_spinlock);
// if set flag to disable processing, // if set flag to disable processing,
@@ -402,14 +402,17 @@ static NF_CALLBACK(ykb_nf_hook, skb) {
} }
spin_unlock(&hot_config_spinlock); spin_unlock(&hot_config_spinlock);
if ((skb->mark & config.mark) == config.mark) if ((skb->mark & config.mark) == config.mark) {
goto accept; goto send_verdict;
}
if (skb->head == NULL) if (skb->head == NULL) {
goto accept; goto send_verdict;
}
if (skb->len > MAX_PACKET_SIZE) if (skb->len >= MAX_PACKET_SIZE) {
goto accept; goto send_verdict;
}
ret = conntrack_parse(skb, &pd.yct); ret = conntrack_parse(skb, &pd.yct);
if (ret < 0) { if (ret < 0) {
@@ -417,34 +420,43 @@ static NF_CALLBACK(ykb_nf_hook, skb) {
} }
if (config.connbytes_limit != 0 && yct_is_mask_attr(YCTATTR_ORIG_PACKETS, &pd.yct) && pd.yct.orig_packets > config.connbytes_limit) if (config.connbytes_limit != 0 && yct_is_mask_attr(YCTATTR_ORIG_PACKETS, &pd.yct) && pd.yct.orig_packets > config.connbytes_limit)
goto accept; goto send_verdict;
ret = skb_linearize(skb); if (skb_is_nonlinear(skb)) {
if (ret < 0) { data_buf = kmalloc(skb->len, GFP_KERNEL);
lgerror(ret, "Cannot linearize"); if (data_buf == NULL) {
goto accept; lgerror(-ENOMEM, "Cannot allocate packet buffer");
}
ret = skb_copy_bits(skb, 0, data_buf, skb->len);
if (ret) {
lgerror(ret, "Cannot copy bits");
goto send_verdict;
}
pd.payload = data_buf;
} else {
pd.payload = skb->data;
} }
pd.payload = skb->data;
pd.payload_len = skb->len; pd.payload_len = skb->len;
int vrd = process_packet(&pd); int vrd = process_packet(&pd);
switch(vrd) { switch(vrd) {
case PKT_ACCEPT: case PKT_ACCEPT:
goto accept; nf_verdict = NF_ACCEPT;
break;
case PKT_DROP: case PKT_DROP:
goto drop; nf_verdict = NF_STOLEN;
kfree_skb(skb);
break;
} }
accept: send_verdict:
kfree(data_buf);
atomic_dec(&hot_config_counter); atomic_dec(&hot_config_counter);
return NF_ACCEPT; return nf_verdict;
drop:
atomic_dec(&hot_config_counter);
kfree_skb(skb);
return NF_STOLEN;
} }