diff options
Diffstat (limited to 'src/user/app/netstack/tcp.c')
| -rw-r--r-- | src/user/app/netstack/tcp.c | 36 |
1 files changed, 19 insertions, 17 deletions
diff --git a/src/user/app/netstack/tcp.c b/src/user/app/netstack/tcp.c index dd6d121..daa728f 100644 --- a/src/user/app/netstack/tcp.c +++ b/src/user/app/netstack/tcp.c @@ -245,22 +245,24 @@ void tcp_parse(const uint8_t *buf, size_t len, struct ipv4 ip) { } } - uint8_t *pkt = malloc(MinHdr); - memset(pkt, 0, MinHdr); - nput16(pkt + SrcPort, dstport); - nput16(pkt + DstPort, srcport); - nput32(pkt + Seq, acknum); - nput32(pkt + AckNum, seq + 1); - uint16_t pktflags = FlagRST | FlagACK; - pktflags |= (MinHdr / 4) << 12; - nput16(pkt + Flags, pktflags); - nput16(pkt + Checksum, ip_checksumphdr(pkt, MinHdr, ip.src, ip.dst, 6)); + if ((flags & FlagRST) == 0) { + uint8_t *pkt = malloc(MinHdr); + memset(pkt, 0, MinHdr); + nput16(pkt + SrcPort, dstport); + nput16(pkt + DstPort, srcport); + nput32(pkt + Seq, acknum); + nput32(pkt + AckNum, seq + 1); + uint16_t pktflags = FlagRST | FlagACK; + pktflags |= (MinHdr / 4) << 12; + nput16(pkt + Flags, pktflags); + nput16(pkt + Checksum, ip_checksumphdr(pkt, MinHdr, ip.src, ip.dst, 6)); - ipv4_send(pkt, MinHdr, (struct ipv4){ - .proto = 6, - .src = ip.dst, - .dst = ip.src, - .e.dst = ip.e.src, - }); - free(pkt); + ipv4_send(pkt, MinHdr, (struct ipv4){ + .proto = 6, + .src = ip.dst, + .dst = ip.src, + .e.dst = ip.e.src, + }); + free(pkt); + } } |