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drop large UDP packets

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This commit is contained in:
Max Lv
2015-07-31 10:28:46 +08:00
parent 6c9ad95232
commit a9f8b2bdfa
2 changed files with 21 additions and 13 deletions
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src/udprelay.c
+18 -12
View File
@@ -635,18 +635,20 @@ static void remote_recv_cb(EV_P_ ev_io *w, int revents)
if (buf_len == -1) {
// error on recv
// simply drop that packet
if (verbose) {
ERROR("[udp] server_recvfrom");
}
ERROR("[udp] remote_recvfrom");
goto CLEAN_UP;
}
// Drop large packets > default MTU
if (buf_len > MTU) {
LOGE("[udp] drop large packets, size: %ld", buf_len);
goto CLEAN_UP;
}
#ifdef UDPRELAY_LOCAL
buf = ss_decrypt_all(BUF_SIZE, buf, &buf_len, server_ctx->method);
if (buf == NULL) {
if (verbose) {
ERROR("[udp] server_ss_decrypt_all");
}
ERROR("[udp] server_ss_decrypt_all");
goto CLEAN_UP;
}
@@ -797,6 +799,8 @@ static void server_recv_cb(EV_P_ ev_io *w, int revents)
LOGE("[udp] unable to get dest addr");
goto CLEAN_UP;
}
src_addr_len = msg.msg_namelen;
#else
ssize_t buf_len =
recvfrom(server_ctx->fd, buf, BUF_SIZE, 0, (struct sockaddr *)&src_addr,
@@ -805,9 +809,7 @@ static void server_recv_cb(EV_P_ ev_io *w, int revents)
if (buf_len == -1) {
// error on recv
// simply drop that packet
if (verbose) {
ERROR("[udp] server_recvfrom");
}
ERROR("[udp] server_recvfrom");
goto CLEAN_UP;
}
#endif
@@ -819,9 +821,7 @@ static void server_recv_cb(EV_P_ ev_io *w, int revents)
#ifdef UDPRELAY_REMOTE
buf = ss_decrypt_all(BUF_SIZE, buf, &buf_len, server_ctx->method);
if (buf == NULL) {
if (verbose) {
ERROR("[udp] server_ss_decrypt_all");
}
ERROR("[udp] server_ss_decrypt_all");
goto CLEAN_UP;
}
#endif
@@ -833,6 +833,12 @@ static void server_recv_cb(EV_P_ ev_io *w, int revents)
#endif
#endif
// Drop large packets > default MTU
if (buf_len > MTU) {
LOGE("[udp] drop large packets, size: %ld", buf_len);
goto CLEAN_UP;
}
/*
*
* SOCKS5 UDP Request
src/udprelay.h
+3 -1
View File
@@ -37,7 +37,9 @@
#include "common.h"
#define MAX_UDP_PACKET_SIZE (64 * 1024)
#define MAX_UDP_PACKET_SIZE (2 * 1024) // large enough for a typical MTU 1500
#define MTU 1421 // 1492 - 1 - 28 - 2 - 40 = 1421, the default MTU for UDP relay
struct server_ctx {
ev_io io;