From: Thomas Huth <thuth@redhat.com>
To: Samuel Thibault <samuel.thibault@ens-lyon.org>, qemu-devel@nongnu.org
Cc: zhanghailiang <zhang.zhanghailiang@huawei.com>,
Li Zhijian <lizhijian@cn.fujitsu.com>,
Stefan Hajnoczi <stefanha@gmail.com>,
Jason Wang <jasowang@redhat.com>,
Dave Gilbert <dgilbert@redhat.com>,
Vasiliy Tolstov <v.tolstov@selfip.ru>,
Huangpeng <peter.huangpeng@huawei.com>,
Gonglei <arei.gonglei@huawei.com>,
Jan Kiszka <jan.kiszka@siemens.com>,
Yang Hongyang <yanghy@cn.fujitsu.com>,
Guillaume Subiron <maethor@subiron.org>
Subject: Re: [Qemu-devel] [PATCHv7 7/9] slirp: Handle IPv6 in TCP functions
Date: Wed, 10 Feb 2016 11:47:05 +0100 [thread overview]
Message-ID: <56BB1529.5080905@redhat.com> (raw)
In-Reply-To: <06d461a76323aec31c62db291e292da1c78107a5.1454927009.git.samuel.thibault@ens-lyon.org>
On 08.02.2016 11:28, Samuel Thibault wrote:
> From: Guillaume Subiron <maethor@subiron.org>
>
> This patch adds IPv6 case in TCP functions refactored by the last
> patches.
> This also adds IPv6 pseudo-header in tcpiphdr structure.
> Finally, tcp_input() is called by ip6_input().
>
> Signed-off-by: Guillaume Subiron <maethor@subiron.org>
> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
> ---
...
> diff --git a/slirp/tcp_input.c b/slirp/tcp_input.c
> index eb0df81..5840471 100644
> --- a/slirp/tcp_input.c
> +++ b/slirp/tcp_input.c
> @@ -216,7 +216,8 @@ present:
> void
> tcp_input(struct mbuf *m, int iphlen, struct socket *inso, unsigned short af)
> {
> - struct ip save_ip, *ip;
> + struct ip save_ip, *ip;
> + struct ip6 save_ip6, *ip6;
> register struct tcpiphdr *ti;
> caddr_t optp = NULL;
> int optlen = 0;
> @@ -230,6 +231,7 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso, unsigned short af)
> int ret;
> struct sockaddr_storage lhost, fhost;
> struct sockaddr_in *lhost4, *fhost4;
> + struct sockaddr_in6 *lhost6, *fhost6;
> struct ex_list *ex_ptr;
> Slirp *slirp;
>
> @@ -256,6 +258,11 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso, unsigned short af)
> }
> slirp = m->slirp;
>
> + ip = mtod(m, struct ip *);
> + ip6 = mtod(m, struct ip6 *);
> + save_ip = *ip;
> + save_ip6 = *ip6;
Could you do the "save_ip = *ip" within the "case AF_INET" below, and
the "save_ip6 = *ip6" within the case AF_INET6 ? That would avoid to
copy bytes that are not required.
> switch (af) {
> case AF_INET:
> if (iphlen > sizeof(struct ip)) {
> @@ -264,13 +271,6 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso, unsigned short af)
> }
> /* XXX Check if too short */
>
> -
> - /*
> - * Save a copy of the IP header in case we want restore it
> - * for sending an ICMP error message in response.
> - */
> - ip = mtod(m, struct ip *);
> - save_ip = *ip;
> save_ip.ip_len += iphlen;
>
> /*
> @@ -295,16 +295,35 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso, unsigned short af)
> ti->ti_dst = save_ip.ip_dst;
> ti->ti_pr = save_ip.ip_p;
> ti->ti_len = htons((uint16_t)tlen);
> - len = ((sizeof(struct tcpiphdr) - sizeof(struct tcphdr)) + tlen);
> - if (cksum(m, len)) {
> - goto drop;
> - }
> + break;
> +
> + case AF_INET6:
> + m->m_data -= sizeof(struct tcpiphdr) - (sizeof(struct ip6)
> + + sizeof(struct tcphdr));
> + m->m_len += sizeof(struct tcpiphdr) - (sizeof(struct ip6)
> + + sizeof(struct tcphdr));
> + ti = mtod(m, struct tcpiphdr *);
> +
> + tlen = ip6->ip_pl;
> + tcpiphdr2qlink(ti)->next = tcpiphdr2qlink(ti)->prev = NULL;
> + memset(&ti->ih_mbuf, 0 , sizeof(struct mbuf_ptr));
> + memset(&ti->ti, 0, sizeof(ti->ti));
> + ti->ti_x0 = 0;
> + ti->ti_src6 = save_ip6.ip_src;
> + ti->ti_dst6 = save_ip6.ip_dst;
> + ti->ti_nh6 = save_ip6.ip_nh;
> + ti->ti_len = htons((uint16_t)tlen);
> break;
>
> default:
> goto drop;
> }
>
> + len = ((sizeof(struct tcpiphdr) - sizeof(struct tcphdr)) + tlen);
> + if (cksum(m, len)) {
> + goto drop;
> + }
> +
> /*
> * Check that TCP offset makes sense,
> * pull out TCP options and adjust length. XXX
> @@ -350,6 +369,14 @@ findso:
> fhost4->sin_addr = ti->ti_dst;
> fhost4->sin_port = ti->ti_dport;
> break;
> + case AF_INET6:
> + lhost6 = (struct sockaddr_in6 *) &lhost;
> + lhost6->sin6_addr = ti->ti_src6;
> + lhost6->sin6_port = ti->ti_sport;
> + fhost6 = (struct sockaddr_in6 *) &fhost;
> + fhost6->sin6_addr = ti->ti_dst6;
> + fhost6->sin6_port = ti->ti_dport;
> + break;
> default:
> goto drop;
> }
> @@ -409,7 +436,6 @@ findso:
> so->so_iptos = ((struct ip *)ti)->ip_tos;
> break;
> default:
> - goto drop;
> break;
> }
> }
> @@ -643,6 +669,9 @@ findso:
> case AF_INET:
> *ip = save_ip;
> break;
> + case AF_INET6:
> + *ip6 = save_ip6;
> + break;
> default:
> goto drop;
> }
> @@ -1518,7 +1547,12 @@ tcp_mss(struct tcpcb *tp, u_int offer)
> mss = min(IF_MTU, IF_MRU) - sizeof(struct tcphdr)
> + sizeof(struct ip);
> break;
> + case AF_INET6:
> + mss = min(IF_MTU, IF_MRU) - sizeof(struct tcphdr)
> + + sizeof(struct ip6);
> + break;
> default:
> + g_assert_not_reached();
> break;
> }
...
Thomas
next prev parent reply other threads:[~2016-02-10 10:47 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-08 10:28 [Qemu-devel] [PATCHv7 0/9] slirp: Adding IPv6 support to Qemu -net user mode Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 1/9] slirp: Adding IPv6, ICMPv6 Echo and NDP autoconfiguration Samuel Thibault
2016-02-09 16:14 ` Thomas Huth
2016-02-09 16:31 ` Samuel Thibault
2016-02-09 19:32 ` Thomas Huth
2016-02-09 20:16 ` Samuel Thibault
2016-02-09 16:31 ` Eric Blake
2016-02-09 16:35 ` Samuel Thibault
2016-02-09 19:56 ` Samuel Thibault
2016-02-09 20:49 ` Thomas Huth
2016-02-09 20:31 ` Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 2/9] slirp: Adding ICMPv6 error sending Samuel Thibault
2016-02-09 19:48 ` Thomas Huth
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 3/9] slirp: Adding IPv6 UDP support Samuel Thibault
2016-02-09 20:44 ` Thomas Huth
2016-02-09 21:13 ` Samuel Thibault
2016-02-09 21:19 ` Samuel Thibault
2016-02-10 7:18 ` Thomas Huth
2016-02-10 7:37 ` Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 4/9] slirp: Factorizing tcpiphdr structure with an union Samuel Thibault
2016-02-10 8:05 ` Thomas Huth
2016-02-10 9:28 ` Samuel Thibault
2016-02-10 10:08 ` Thomas Huth
2016-02-10 12:20 ` Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 5/9] slirp: Generalizing and neutralizing various TCP functions before adding IPv6 stuff Samuel Thibault
2016-02-10 8:35 ` Thomas Huth
2016-02-10 9:17 ` Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 6/9] slirp: Reindent after refactoring Samuel Thibault
2016-02-10 8:42 ` Thomas Huth
2016-02-10 9:20 ` Samuel Thibault
2016-02-11 17:56 ` Eric Blake
2016-02-11 18:15 ` Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 7/9] slirp: Handle IPv6 in TCP functions Samuel Thibault
2016-02-10 10:47 ` Thomas Huth [this message]
2016-02-10 12:30 ` Samuel Thibault
2016-02-10 12:41 ` Thomas Huth
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 8/9] slirp: Adding IPv6 address for DNS relay Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 9/9] qapi-schema, qemu-options & slirp: Adding Qemu options for IPv6 addresses Samuel Thibault
2016-02-08 22:12 ` Eric Blake
2016-02-10 11:39 ` Thomas Huth
2016-02-10 12:45 ` Samuel Thibault
2016-02-10 13:08 ` Daniel P. Berrange
2016-02-11 20:30 ` Thomas Huth
2016-02-14 17:47 [Qemu-devel] [PATCHv8 0/9] slirp: Adding IPv6 support to Qemu -net user mode Samuel Thibault
2016-02-14 17:47 ` [Qemu-devel] [PATCHv7 7/9] slirp: Handle IPv6 in TCP functions Samuel Thibault
2016-02-17 9:18 ` Thomas Huth
2016-02-17 9:30 ` Samuel Thibault
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