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closing connection if a fragmented packet is received

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robert committed 2023-08-30 10:30:51 -04:00
1 parent d5b5cec797
commit f33e3a7752
3 files changed
+95 -21
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src/net_builtin.c
+9 -1
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@@ -45,6 +45,8 @@ struct ip {
uint16_t len; // Length
uint16_t id; // Unused
uint16_t frag; // Fragmentation
#define IP_FRAG_OFFSET_MSK 0xFF1F
#define IP_MORE_FRAGS_MSK 0x20
uint8_t ttl; // Time to live
uint8_t proto; // Upper level protocol
uint16_t csum; // Checksum
@@ -721,7 +723,13 @@ static void rx_tcp(struct mg_tcpip_if *ifp, struct pkt *pkt) {
}
static void rx_ip(struct mg_tcpip_if *ifp, struct pkt *pkt) {
if (pkt->ip->proto == 1) {
if (pkt->ip->frag & IP_MORE_FRAGS_MSK ||
pkt->ip->frag & IP_FRAG_OFFSET_MSK) {
if (pkt->ip->proto == 17) pkt->udp = (struct udp *) (pkt->ip + 1);
if (pkt->ip->proto == 6) pkt->tcp = (struct tcp *) (pkt->ip + 1);
struct mg_connection *c = getpeer(ifp->mgr, pkt, false);
if (c) mg_error(c, "Received fragmented packet");
} else if (pkt->ip->proto == 1) {
pkt->icmp = (struct icmp *) (pkt->ip + 1);
if (pkt->pay.len < sizeof(*pkt->icmp)) return;
mkpay(pkt, pkt->icmp + 1);