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nfqws2: save some syscalls

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bol-van
2026-02-22 18:22:43 +03:00
parent 272f086639
commit 4d753ecdc6
1 changed files with 40 additions and 14 deletions
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54
nfq2/nfqws.c
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@@ -43,6 +43,7 @@
#endif
#ifdef __linux__
#include <sys/ioctl.h>
#include <libnetfilter_queue/libnetfilter_queue.h>
#define NF_DROP 0
#define NF_ACCEPT 1
@@ -240,6 +241,13 @@ static int write_pidfile(FILE **Fpid)
#ifdef __linux__
struct nfq_cb_data
{
uint8_t *mod;
int sock;
};
// cookie must point to mod buffer with size RECONSTRUCT_MAX_SIZE
static int nfq_cb(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg, struct nfq_data *nfa, void *cookie)
{
@@ -248,10 +256,10 @@ static int nfq_cb(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg, struct nfq_da
struct nfqnl_msg_packet_hdr *ph;
uint8_t *data;
uint32_t ifidx_out, ifidx_in;
char ifout[IFNAMSIZ], ifin[IFNAMSIZ];
size_t modlen;
uint8_t *mod = (uint8_t*)cookie;
struct nfq_cb_data *cbdata = (struct nfq_cb_data*)cookie;
uint32_t mark;
struct ifreq ifr_in, ifr_out;
ph = nfq_get_msg_packet_hdr(nfa);
id = ph ? ntohl(ph->packet_id) : 0;
@@ -259,15 +267,25 @@ static int nfq_cb(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg, struct nfq_da
mark = nfq_get_nfmark(nfa);
ilen = nfq_get_payload(nfa, &data);
*ifr_out.ifr_name = 0;
ifidx_out = nfq_get_outdev(nfa);
*ifout = 0;
if (ifidx_out) if_indextoname(ifidx_out, ifout);
if (ifidx_out)
{
ifr_out.ifr_ifindex = ifidx_out;
if (ioctl(cbdata->sock, SIOCGIFNAME, &ifr_out)<0)
DLOG_PERROR("ioctl(SIOCGIFNAME)");
}
*ifr_in.ifr_name = 0;
ifidx_in = nfq_get_indev(nfa);
*ifin = 0;
if (ifidx_in) if_indextoname(ifidx_in, ifin);
if (ifidx_in)
{
ifr_in.ifr_ifindex = ifidx_in;
if (ioctl(cbdata->sock, SIOCGIFNAME, &ifr_in)<0)
DLOG_PERROR("ioctl(SIOCGIFNAME)");
}
DLOG("\npacket: id=%d len=%d mark=%08X ifin=%s(%u) ifout=%s(%u)\n", id, ilen, mark, ifin, ifidx_in, ifout, ifidx_out);
DLOG("\npacket: id=%d len=%d mark=%08X ifin=%s(%u) ifout=%s(%u)\n", id, ilen, mark, ifr_in.ifr_name, ifidx_in, ifr_out.ifr_name, ifidx_out);
if (ilen >= 0)
{
@@ -277,12 +295,12 @@ static int nfq_cb(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg, struct nfq_da
// to support increased sizes use separate mod buffer
// this is not a problem because only LUA code can trigger VERDICT_MODIFY (and postnat workaround too, once a connection if first packet is dropped)
// in case of VERIDCT_MODIFY packet is always reconstructed from dissect, so no difference where to save the data => no performance loss
uint8_t verdict = processPacketData(&mark, ifin, ifout, data, len, mod, &modlen);
uint8_t verdict = processPacketData(&mark, ifr_in.ifr_name, ifr_out.ifr_name, data, len, cbdata->mod, &modlen);
switch (verdict & VERDICT_MASK)
{
case VERDICT_MODIFY:
DLOG("packet: id=%d pass modified. len %zu => %zu\n", id, len, modlen);
return nfq_set_verdict2(qh, id, NF_ACCEPT, mark, (uint32_t)modlen, mod);
return nfq_set_verdict2(qh, id, NF_ACCEPT, mark, (uint32_t)modlen, cbdata->mod);
case VERDICT_DROP:
DLOG("packet: id=%d drop\n", id);
return nfq_set_verdict2(qh, id, NF_DROP, mark, 0, NULL);
@@ -306,7 +324,7 @@ static void nfq_deinit(struct nfq_handle **h, struct nfq_q_handle **qh)
*h = NULL;
}
}
static bool nfq_init(struct nfq_handle **h, struct nfq_q_handle **qh, uint8_t *mod_buffer)
static bool nfq_init(struct nfq_handle **h, struct nfq_q_handle **qh, struct nfq_cb_data *cbdata)
{
nfq_deinit(h, qh);
@@ -343,7 +361,7 @@ static bool nfq_init(struct nfq_handle **h, struct nfq_q_handle **qh, uint8_t *m
}
DLOG_CONDUP("binding this socket to queue '%u'\n", params.qnum);
*qh = nfq_create_queue(*h, params.qnum, &nfq_cb, mod_buffer);
*qh = nfq_create_queue(*h, params.qnum, &nfq_cb, cbdata);
if (!*qh) {
DLOG_PERROR("nfq_create_queue()");
goto exiterr;
@@ -399,6 +417,7 @@ static int nfq_main(void)
ssize_t rd;
FILE *Fpid = NULL;
uint8_t *buf=NULL, *mod=NULL;
struct nfq_cb_data cbdata = { .sock = -1 };
if (*params.pidfile && !(Fpid = fopen(params.pidfile, "w")))
{
@@ -440,13 +459,19 @@ static int nfq_main(void)
goto exok;
}
if (!(buf = malloc(NFQ_MAX_RECV_SIZE)) || !(mod = malloc(RECONSTRUCT_MAX_SIZE)))
if (!(buf = malloc(NFQ_MAX_RECV_SIZE)) || !(cbdata.mod = malloc(RECONSTRUCT_MAX_SIZE)))
{
DLOG_ERR("out of memory\n");
goto err;
}
if (!nfq_init(&h, &qh, mod))
if ((cbdata.sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
DLOG_PERROR("socket");
goto err;
}
if (!nfq_init(&h, &qh, &cbdata))
goto err;
#ifdef HAS_FILTER_SSID
@@ -500,7 +525,8 @@ static int nfq_main(void)
exok:
res=0;
ex:
free(mod);
free(cbdata.mod);
if (cbdata.sock>=0) close(cbdata.sock);
free(buf);
nfq_deinit(&h, &qh);
lua_shutdown();