From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55224) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aSj48-0003X9-Rh for qemu-devel@nongnu.org; Mon, 08 Feb 2016 05:29:11 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aSj45-0006HG-Df for qemu-devel@nongnu.org; Mon, 08 Feb 2016 05:29:08 -0500 Received: from mail2-relais-roc.national.inria.fr ([192.134.164.83]:19295) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aSj45-0006GG-2a for qemu-devel@nongnu.org; Mon, 08 Feb 2016 05:29:05 -0500 From: Samuel Thibault Date: Mon, 8 Feb 2016 11:28:54 +0100 Message-Id: <145e7741b4d6eeac3d69ea9cf40110229167db0c.1454927009.git.samuel.thibault@ens-lyon.org> In-Reply-To: References: In-Reply-To: References: Subject: [Qemu-devel] [PATCHv7 5/9] slirp: Generalizing and neutralizing various TCP functions before adding IPv6 stuff List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Thomas Huth , zhanghailiang , Li Zhijian , Stefan Hajnoczi , Jason Wang , Dave Gilbert , Vasiliy Tolstov , Huangpeng , Gonglei , Jan Kiszka , Samuel Thibault , Yang Hongyang , Guillaume Subiron From: Guillaume Subiron Basically, this patch adds some switch in various TCP functions to prepare them for the IPv6 case. To have something to "switch" in tcp_input() and tcp_respond(), a new argument is used to give them the sa_family of the addresses they are working on. This patch does not include the entailed reindentation, to make proofread easier. Reindentation is adressed in the following no-op patch. Signed-off-by: Guillaume Subiron Signed-off-by: Samuel Thibault --- slirp/ip_input.c | 2 +- slirp/slirp.c | 6 ++++-- slirp/slirp.h | 5 +++-- slirp/tcp_input.c | 52 ++++++++++++++++++++++++++++++++++++++++++++-------- slirp/tcp_output.c | 14 +++++++++++--- slirp/tcp_subr.c | 37 +++++++++++++++++++++++++++++-------- slirp/tcp_timer.c | 3 ++- 7 files changed, 94 insertions(+), 25 deletions(-) diff --git a/slirp/ip_input.c b/slirp/ip_input.c index 16fb2cb..12f173d 100644 --- a/slirp/ip_input.c +++ b/slirp/ip_input.c @@ -200,7 +200,7 @@ ip_input(struct mbuf *m) */ switch (ip->ip_p) { case IPPROTO_TCP: - tcp_input(m, hlen, (struct socket *)NULL); + tcp_input(m, hlen, (struct socket *)NULL, AF_INET); break; case IPPROTO_UDP: udp_input(m, hlen); diff --git a/slirp/slirp.c b/slirp/slirp.c index 551f100..cca5a80 100644 --- a/slirp/slirp.c +++ b/slirp/slirp.c @@ -573,7 +573,8 @@ void slirp_pollfds_poll(GArray *pollfds, int select_error) /* * Continue tcp_input */ - tcp_input((struct mbuf *)NULL, sizeof(struct ip), so); + tcp_input((struct mbuf *)NULL, sizeof(struct ip), so, + so->so_ffamily); /* continue; */ } else { ret = sowrite(so); @@ -622,7 +623,8 @@ void slirp_pollfds_poll(GArray *pollfds, int select_error) } } - tcp_input((struct mbuf *)NULL, sizeof(struct ip), so); + tcp_input((struct mbuf *)NULL, sizeof(struct ip), so, + so->so_ffamily); } /* SS_ISFCONNECTING */ #endif } diff --git a/slirp/slirp.h b/slirp/slirp.h index 1772222..3261815 100644 --- a/slirp/slirp.h +++ b/slirp/slirp.h @@ -346,7 +346,7 @@ void ip6_input(struct mbuf *); int ip6_output(struct socket *, struct mbuf *, int fast); /* tcp_input.c */ -void tcp_input(register struct mbuf *, int, struct socket *); +void tcp_input(register struct mbuf *, int, struct socket *, unsigned short af); int tcp_mss(register struct tcpcb *, u_int); /* tcp_output.c */ @@ -357,7 +357,8 @@ void tcp_setpersist(register struct tcpcb *); void tcp_init(Slirp *); void tcp_cleanup(Slirp *); void tcp_template(struct tcpcb *); -void tcp_respond(struct tcpcb *, register struct tcpiphdr *, register struct mbuf *, tcp_seq, tcp_seq, int); +void tcp_respond(struct tcpcb *, register struct tcpiphdr *, + register struct mbuf *, tcp_seq, tcp_seq, int, unsigned short); struct tcpcb * tcp_newtcpcb(struct socket *); struct tcpcb * tcp_close(register struct tcpcb *); void tcp_sockclosed(struct tcpcb *); diff --git a/slirp/tcp_input.c b/slirp/tcp_input.c index 26b0c8b..0cc279b 100644 --- a/slirp/tcp_input.c +++ b/slirp/tcp_input.c @@ -214,7 +214,7 @@ present: * protocol specification dated September, 1981 very closely. */ void -tcp_input(struct mbuf *m, int iphlen, struct socket *inso) +tcp_input(struct mbuf *m, int iphlen, struct socket *inso, unsigned short af) { struct ip save_ip, *ip; register struct tcpiphdr *ti; @@ -256,6 +256,8 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso) } slirp = m->slirp; + switch (af) { + case AF_INET: if (iphlen > sizeof(struct ip )) { ip_stripoptions(m, (struct mbuf *)0); iphlen=sizeof(struct ip ); @@ -297,6 +299,11 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso) if(cksum(m, len)) { goto drop; } + break; + + default: + goto drop; + } /* * Check that TCP offset makes sense, @@ -332,14 +339,20 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso) * Locate pcb for segment. */ findso: - lhost.ss_family = AF_INET; + lhost.ss_family = af; + fhost.ss_family = af; + switch (af) { + case AF_INET: lhost4 = (struct sockaddr_in *) &lhost; lhost4->sin_addr = ti->ti_src; lhost4->sin_port = ti->ti_sport; - fhost.ss_family = AF_INET; fhost4 = (struct sockaddr_in *) &fhost; fhost4->sin_addr = ti->ti_dst; fhost4->sin_port = ti->ti_dport; + break; + default: + goto drop; + } so = solookup(&slirp->tcp_last_so, &slirp->tcb, &lhost, &fhost); @@ -389,8 +402,17 @@ findso: so->lhost.ss = lhost; so->fhost.ss = fhost; - if ((so->so_iptos = tcp_tos(so)) == 0) + so->so_iptos = tcp_tos(so); + if (so->so_iptos == 0) { + switch (af) { + case AF_INET: so->so_iptos = ((struct ip *)ti)->ip_tos; + break; + default: + goto drop; + break; + } + } tp = sototcpcb(so); tp->t_state = TCPS_LISTEN; @@ -569,7 +591,8 @@ findso: * If this is destined for the control address, then flag to * tcp_ctl once connected, otherwise connect */ - if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) == + if (af == AF_INET && + (so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) == slirp->vnetwork_addr.s_addr) { if (so->so_faddr.s_addr != slirp->vhost_addr.s_addr && so->so_faddr.s_addr != slirp->vnameserver_addr.s_addr) { @@ -607,7 +630,7 @@ findso: if(errno == ECONNREFUSED) { /* ACK the SYN, send RST to refuse the connection */ tcp_respond(tp, ti, m, ti->ti_seq+1, (tcp_seq)0, - TH_RST|TH_ACK); + TH_RST|TH_ACK, af); } else { if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST; HTONL(ti->ti_seq); /* restore tcp header */ @@ -616,7 +639,13 @@ findso: HTONS(ti->ti_urp); m->m_data -= sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr); m->m_len += sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr); + switch (af) { + case AF_INET: *ip=save_ip; + break; + default: + goto drop; + } icmp_send_error(m, ICMP_UNREACH, code, 0, strerror(errno)); } tcp_close(tp); @@ -1289,11 +1318,11 @@ dropafterack: dropwithreset: /* reuses m if m!=NULL, m_free() unnecessary */ if (tiflags & TH_ACK) - tcp_respond(tp, ti, m, (tcp_seq)0, ti->ti_ack, TH_RST); + tcp_respond(tp, ti, m, (tcp_seq)0, ti->ti_ack, TH_RST, af); else { if (tiflags & TH_SYN) ti->ti_len++; tcp_respond(tp, ti, m, ti->ti_seq+ti->ti_len, (tcp_seq)0, - TH_RST|TH_ACK); + TH_RST|TH_ACK, af); } return; @@ -1484,7 +1513,14 @@ tcp_mss(struct tcpcb *tp, u_int offer) DEBUG_ARG("tp = %p", tp); DEBUG_ARG("offer = %d", offer); + switch (so->so_ffamily) { + case AF_INET: mss = min(IF_MTU, IF_MRU) - sizeof(struct tcphdr) + sizeof(struct ip); + break; + default: + break; + } + if (offer) mss = min(mss, offer); mss = max(mss, 32); diff --git a/slirp/tcp_output.c b/slirp/tcp_output.c index 7fc6a87..62ab1e5 100644 --- a/slirp/tcp_output.c +++ b/slirp/tcp_output.c @@ -61,7 +61,8 @@ tcp_output(struct tcpcb *tp) register long len, win; int off, flags, error; register struct mbuf *m; - register struct tcpiphdr *ti; + register struct tcpiphdr *ti, tcpiph_save; + struct ip *ip; u_char opt[MAX_TCPOPTLEN]; unsigned optlen, hdrlen; int idle, sendalot; @@ -447,13 +448,15 @@ send: * the template, but need a way to checksum without them. */ m->m_len = hdrlen + len; /* XXX Needed? m_len should be correct */ + tcpiph_save = *(mtod(m, struct tcpiphdr *)); - struct tcpiphdr tcpiph_save = *(mtod(m, struct tcpiphdr *)); + switch (so->so_ffamily) { + case AF_INET: m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr) - sizeof(struct ip); m->m_len -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr) - sizeof(struct ip); - struct ip *ip = mtod(m, struct ip *); + ip = mtod(m, struct ip *); ip->ip_len = m->m_len; ip->ip_dst = tcpiph_save.ti_dst; @@ -464,6 +467,11 @@ send: ip->ip_tos = so->so_iptos; error = ip_output(so, m); + break; + + default: + goto out; + } if (error) { out: diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c index cd021df..f1d62f6 100644 --- a/slirp/tcp_subr.c +++ b/slirp/tcp_subr.c @@ -78,12 +78,19 @@ tcp_template(struct tcpcb *tp) n->ti_mbuf = NULL; memset(&n->ti, 0, sizeof(n->ti)); n->ti_x0 = 0; + switch (so->so_ffamily) { + case AF_INET: n->ti_pr = IPPROTO_TCP; n->ti_len = htons(sizeof(struct tcphdr)); n->ti_src = so->so_faddr; n->ti_dst = so->so_laddr; n->ti_sport = so->so_fport; n->ti_dport = so->so_lport; + break; + + default: + break; + } n->ti_seq = 0; n->ti_ack = 0; @@ -110,7 +117,7 @@ tcp_template(struct tcpcb *tp) */ void tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m, - tcp_seq ack, tcp_seq seq, int flags) + tcp_seq ack, tcp_seq seq, int flags, unsigned short af) { register int tlen; int win = 0; @@ -144,8 +151,14 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m, m->m_len = sizeof (struct tcpiphdr); tlen = 0; #define xchg(a,b,type) { type t; t=a; a=b; b=t; } + switch (af) { + case AF_INET: xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, uint32_t); xchg(ti->ti_dport, ti->ti_sport, uint16_t); + break; + default: + break; + } #undef xchg } ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen)); @@ -168,11 +181,15 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m, ti->ti_sum = cksum(m, tlen); struct tcpiphdr tcpiph_save = *(mtod(m, struct tcpiphdr *)); + struct ip *ip; + + switch (af) { + case AF_INET: m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr) - sizeof(struct ip); m->m_len -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr) - sizeof(struct ip); - struct ip *ip = mtod(m, struct ip *); + ip = mtod(m, struct ip *); ip->ip_len = tlen; ip->ip_dst = tcpiph_save.ti_dst; ip->ip_src = tcpiph_save.ti_src; @@ -185,6 +202,11 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m, } (void) ip_output((struct socket *)0, m); + break; + + default: + break; + } } /* @@ -388,8 +410,8 @@ void tcp_connect(struct socket *inso) { Slirp *slirp = inso->slirp; struct socket *so; - struct sockaddr_in addr; - socklen_t addrlen = sizeof(struct sockaddr_in); + struct sockaddr_storage addr; + socklen_t addrlen = sizeof(struct sockaddr_storage); struct tcpcb *tp; int s, opt; @@ -414,9 +436,8 @@ void tcp_connect(struct socket *inso) free(so); /* NOT sofree */ return; } - so->so_lfamily = AF_INET; - so->so_laddr = inso->so_laddr; - so->so_lport = inso->so_lport; + so->lhost = inso->lhost; + so->so_ffamily = inso->so_ffamily; } tcp_mss(sototcpcb(so), 0); @@ -432,7 +453,7 @@ void tcp_connect(struct socket *inso) qemu_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int)); socket_set_nodelay(s); - so->fhost.sin = addr; + so->fhost.ss = addr; sotranslate_accept(so); /* Close the accept() socket, set right state */ diff --git a/slirp/tcp_timer.c b/slirp/tcp_timer.c index 1214c2e..8f5dd77 100644 --- a/slirp/tcp_timer.c +++ b/slirp/tcp_timer.c @@ -278,7 +278,8 @@ tcp_timers(register struct tcpcb *tp, int timer) * correspondent TCP to respond. */ tcp_respond(tp, &tp->t_template, (struct mbuf *)NULL, - tp->rcv_nxt, tp->snd_una - 1, 0); + tp->rcv_nxt, tp->snd_una - 1, 0, + tp->t_socket->so_ffamily); tp->t_timer[TCPT_KEEP] = TCPTV_KEEPINTVL; } else tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_IDLE; -- 2.7.0