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Merge pull request #3406 from cesanta/reserved

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allow creative usage of TCP reserved space in 'flags'
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Sergio R. Caprile authored and GitHub committed 2026-01-12 13:56:18 -03:00
2 parents 1a0716ae4d 29254ce84b
commit e2c0b2b477
2 files changed
+8 -4
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mongoose.c
+4 -2
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@@ -4939,8 +4939,9 @@ struct tcp {
#define TH_PUSH 0x08
#define TH_ACK 0x10
#define TH_URG 0x20
#define TH_ECE 0x40
#define TH_CWR 0x80
#define TH_STDFLAGS 0x3f
//#define TH_ECE 0x40 // not part of TCP but RFC-3168 (ECN)
//#define TH_CWR 0x80
uint16_t win; // Window
uint16_t csum; // Checksum
uint16_t urp; // Urgent pointer
@@ -6269,6 +6270,7 @@ static void handle_opt(struct connstate *s, struct tcp *tcp, bool ip6) {
static void rx_tcp(struct mg_tcpip_if *ifp, struct pkt *pkt) {
struct mg_connection *c = getpeer(ifp->mgr, pkt, false);
struct connstate *s = c == NULL ? NULL : (struct connstate *) (c + 1);
pkt->tcp->flags &= TH_STDFLAGS; // tolerate creative usage (ECN, ?)
// Order is VERY important; RFC-9293 3.5.2
// - check clients (Group 1) and established connections (Group 3)
if (c != NULL && c->is_connecting && pkt->tcp->flags == (TH_SYN | TH_ACK)) {
src/net_builtin.c
+4 -2
View File
@@ -118,8 +118,9 @@ struct tcp {
#define TH_PUSH 0x08
#define TH_ACK 0x10
#define TH_URG 0x20
#define TH_ECE 0x40
#define TH_CWR 0x80
#define TH_STDFLAGS 0x3f
//#define TH_ECE 0x40 // not part of TCP but RFC-3168 (ECN)
//#define TH_CWR 0x80
uint16_t win; // Window
uint16_t csum; // Checksum
uint16_t urp; // Urgent pointer
@@ -1448,6 +1449,7 @@ static void handle_opt(struct connstate *s, struct tcp *tcp, bool ip6) {
static void rx_tcp(struct mg_tcpip_if *ifp, struct pkt *pkt) {
struct mg_connection *c = getpeer(ifp->mgr, pkt, false);
struct connstate *s = c == NULL ? NULL : (struct connstate *) (c + 1);
pkt->tcp->flags &= TH_STDFLAGS; // tolerate creative usage (ECN, ?)
// Order is VERY important; RFC-9293 3.5.2
// - check clients (Group 1) and established connections (Group 3)
if (c != NULL && c->is_connecting && pkt->tcp->flags == (TH_SYN | TH_ACK)) {