diff options
Diffstat (limited to 'tcp.c')
| -rw-r--r-- | tcp.c | 59 |
1 files changed, 20 insertions, 39 deletions
@@ -753,44 +753,16 @@ static void tcp_sock_set_bufsize(const struct ctx *c, int s) } /** - * tcp_update_check_tcp4() - Calculate TCP checksum for IPv4 - * @iph: IPv4 header + * tcp_update_csum() - Calculate TCP checksum + * @psum: Unfolded partial checksum of the IPv4 or IPv6 pseudo-header * @th: TCP header (updated) * @payload: TCP payload */ -void tcp_update_check_tcp4(const struct iphdr *iph, struct tcphdr *th, - struct iov_tail *payload) +void tcp_update_csum(uint32_t psum, struct tcphdr *th, struct iov_tail *payload) { - uint16_t l4len = ntohs(iph->tot_len) - sizeof(struct iphdr); - struct in_addr saddr = { .s_addr = iph->saddr }; - struct in_addr daddr = { .s_addr = iph->daddr }; - uint32_t sum; - - sum = proto_ipv4_header_psum(l4len, IPPROTO_TCP, saddr, daddr); - - th->check = 0; - sum = csum_unfolded(th, sizeof(*th), sum); - th->check = csum_iov_tail(payload, sum); -} - -/** - * tcp_update_check_tcp6() - Calculate TCP checksum for IPv6 - * @ip6h: IPv6 header - * @th: TCP header (updated) - * @payload: TCP payload - */ -void tcp_update_check_tcp6(const struct ipv6hdr *ip6h, struct tcphdr *th, - struct iov_tail *payload) -{ - uint16_t l4len = ntohs(ip6h->payload_len); - uint32_t sum; - - sum = proto_ipv6_header_psum(l4len, IPPROTO_TCP, &ip6h->saddr, - &ip6h->daddr); - th->check = 0; - sum = csum_unfolded(th, sizeof(*th), sum); - th->check = csum_iov_tail(payload, sum); + psum = csum_unfolded(th, sizeof(*th), psum); + th->check = csum_iov_tail(payload, psum); } /** @@ -937,10 +909,14 @@ void tcp_fill_headers4(const struct tcp_tap_conn *conn, tcp_fill_header(th, conn, seq); - if (no_tcp_csum) + if (no_tcp_csum) { th->check = 0; - else - tcp_update_check_tcp4(iph, th, payload); + } else { + uint32_t psum = proto_ipv4_header_psum(l4len, IPPROTO_TCP, + *src4, *dst4); + + tcp_update_csum(psum, th, payload); + } tap_hdr_update(taph, l3len + sizeof(struct ethhdr)); } @@ -978,10 +954,15 @@ void tcp_fill_headers6(const struct tcp_tap_conn *conn, tcp_fill_header(th, conn, seq); - if (no_tcp_csum) + if (no_tcp_csum) { th->check = 0; - else - tcp_update_check_tcp6(ip6h, th, payload); + } else { + uint32_t psum = proto_ipv6_header_psum(l4len, IPPROTO_TCP, + &ip6h->saddr, + &ip6h->daddr); + + tcp_update_csum(psum, th, payload); + } tap_hdr_update(taph, l4len + sizeof(*ip6h) + sizeof(struct ethhdr)); } |