| 397 | |
| 398 | #ifdef INET |
| 399 | static int |
| 400 | tcp_lro_rx_ipv4(struct lro_ctrl *lc, struct mbuf *m, struct ip *ip4, |
| 401 | struct tcphdr **th) |
| 402 | { |
| 403 | int csum_flags; |
| 404 | uint16_t csum; |
| 405 | |
| 406 | if (ip4->ip_p != IPPROTO_TCP) |
| 407 | return (TCP_LRO_NOT_SUPPORTED); |
| 408 | |
| 409 | /* Ensure there are no options. */ |
| 410 | if ((ip4->ip_hl << 2) != sizeof (*ip4)) |
| 411 | return (TCP_LRO_CANNOT); |
| 412 | |
| 413 | /* .. and the packet is not fragmented. */ |
| 414 | if (ip4->ip_off & htons(IP_MF|IP_OFFMASK)) |
| 415 | return (TCP_LRO_CANNOT); |
| 416 | |
| 417 | /* Legacy IP has a header checksum that needs to be correct. */ |
| 418 | csum_flags = m->m_pkthdr.csum_flags; |
| 419 | if (csum_flags & CSUM_IP_CHECKED) { |
| 420 | if (__predict_false((csum_flags & CSUM_IP_VALID) == 0)) { |
| 421 | lc->lro_bad_csum++; |
| 422 | return (TCP_LRO_CANNOT); |
| 423 | } |
| 424 | } else { |
| 425 | csum = in_cksum_hdr(ip4); |
| 426 | if (__predict_false((csum) != 0)) { |
| 427 | lc->lro_bad_csum++; |
| 428 | return (TCP_LRO_CANNOT); |
| 429 | } |
| 430 | } |
| 431 | /* Find the TCP header (we assured there are no IP options). */ |
| 432 | *th = (struct tcphdr *)(ip4 + 1); |
| 433 | return (0); |
| 434 | } |
| 435 | #endif |
| 436 | |
| 437 | static void |
no test coverage detected