From f528e8d71f3a9fe1953f7fb822571d3050531acb Mon Sep 17 00:00:00 2001 From: bz Date: Fri, 25 May 2012 02:58:21 +0000 Subject: MFp4 bz_ipv6_fast: Factor out Hop-By-Hop option processing. It's still not heavily used, it reduces the footprint of ip6_input() and makes ip6_input() more readable. Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems Reviewed by: gnn (as part of the whole) MFC After: 3 days --- sys/netinet6/ip6_input.c | 143 ++++++++++++++++++++++++++--------------------- 1 file changed, 80 insertions(+), 63 deletions(-) diff --git a/sys/netinet6/ip6_input.c b/sys/netinet6/ip6_input.c index 2d2860b..0451888 100644 --- a/sys/netinet6/ip6_input.c +++ b/sys/netinet6/ip6_input.c @@ -331,6 +331,83 @@ ip6_init2(void *dummy) /* This must be after route_init(), which is now SI_ORDER_THIRD */ SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); +static int +ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, + int *nxt, int *ours) +{ + struct ip6_hdr *ip6; + struct ip6_hbh *hbh; + + if (ip6_hopopts_input(plen, rtalert, &m, off)) { +#if 0 /*touches NULL pointer*/ + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); +#endif + goto out; /* m have already been freed */ + } + + /* adjust pointer */ + ip6 = mtod(m, struct ip6_hdr *); + + /* + * if the payload length field is 0 and the next header field + * indicates Hop-by-Hop Options header, then a Jumbo Payload + * option MUST be included. + */ + if (ip6->ip6_plen == 0 && *plen == 0) { + /* + * Note that if a valid jumbo payload option is + * contained, ip6_hopopts_input() must set a valid + * (non-zero) payload length to the variable plen. + */ + V_ip6stat.ip6s_badoptions++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); + icmp6_error(m, ICMP6_PARAM_PROB, + ICMP6_PARAMPROB_HEADER, + (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); + goto out; + } +#ifndef PULLDOWN_TEST + /* ip6_hopopts_input() ensures that mbuf is contiguous */ + hbh = (struct ip6_hbh *)(ip6 + 1); +#else + IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), + sizeof(struct ip6_hbh)); + if (hbh == NULL) { + V_ip6stat.ip6s_tooshort++; + goto out; + } +#endif + *nxt = hbh->ip6h_nxt; + + /* + * If we are acting as a router and the packet contains a + * router alert option, see if we know the option value. + * Currently, we only support the option value for MLD, in which + * case we should pass the packet to the multicast routing + * daemon. + */ + if (*rtalert != ~0) { + switch (*rtalert) { + case IP6OPT_RTALERT_MLD: + if (V_ip6_forwarding) + *ours = 1; + break; + default: + /* + * RFC2711 requires unrecognized values must be + * silently ignored. + */ + break; + } + } + + return (0); + +out: + return (1); +} + void ip6_input(struct mbuf *m) { @@ -825,71 +902,11 @@ passin: */ plen = (u_int32_t)ntohs(ip6->ip6_plen); if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { - struct ip6_hbh *hbh; + int error; - if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { -#if 0 /*touches NULL pointer*/ - in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); -#endif - goto out; /* m have already been freed */ - } - - /* adjust pointer */ - ip6 = mtod(m, struct ip6_hdr *); - - /* - * if the payload length field is 0 and the next header field - * indicates Hop-by-Hop Options header, then a Jumbo Payload - * option MUST be included. - */ - if (ip6->ip6_plen == 0 && plen == 0) { - /* - * Note that if a valid jumbo payload option is - * contained, ip6_hopopts_input() must set a valid - * (non-zero) payload length to the variable plen. - */ - V_ip6stat.ip6s_badoptions++; - in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); - in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); - icmp6_error(m, ICMP6_PARAM_PROB, - ICMP6_PARAMPROB_HEADER, - (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); + error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); + if (error != 0) goto out; - } -#ifndef PULLDOWN_TEST - /* ip6_hopopts_input() ensures that mbuf is contiguous */ - hbh = (struct ip6_hbh *)(ip6 + 1); -#else - IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), - sizeof(struct ip6_hbh)); - if (hbh == NULL) { - V_ip6stat.ip6s_tooshort++; - goto out; - } -#endif - nxt = hbh->ip6h_nxt; - - /* - * If we are acting as a router and the packet contains a - * router alert option, see if we know the option value. - * Currently, we only support the option value for MLD, in which - * case we should pass the packet to the multicast routing - * daemon. - */ - if (rtalert != ~0) { - switch (rtalert) { - case IP6OPT_RTALERT_MLD: - if (V_ip6_forwarding) - ours = 1; - break; - default: - /* - * RFC2711 requires unrecognized values must be - * silently ignored. - */ - break; - } - } } else nxt = ip6->ip6_nxt; -- cgit v1.1