// SPDX-License-Identifier: GPL-2.0-or-later /* SCTP kernel implementation * (C) Copyright IBM Corp. 2002, 2004 * Copyright (c) 2001 Nokia, Inc. * Copyright (c) 2001 La Monte H.P. Yarroll * Copyright (c) 2002-2003 Intel Corp. * * This file is part of the SCTP kernel implementation * * SCTP over IPv6. * * Please send any bug reports or fixes you make to the * email address(es): * lksctp developers <linux-sctp@vger.kernel.org> * * Written or modified by: * Le Yanqun <yanqun.le@nokia.com> * Hui Huang <hui.huang@nokia.com> * La Monte H.P. Yarroll <piggy@acm.org> * Sridhar Samudrala <sri@us.ibm.com> * Jon Grimm <jgrimm@us.ibm.com> * Ardelle Fan <ardelle.fan@intel.com> * * Based on: * linux/net/ipv6/tcp_ipv6.c */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/sockios.h> #include <linux/net.h> #include <linux/in.h> #include <linux/in6.h> #include <linux/netdevice.h> #include <linux/init.h> #include <linux/ipsec.h> #include <linux/slab.h> #include <linux/ipv6.h> #include <linux/icmpv6.h> #include <linux/random.h> #include <linux/seq_file.h> #include <net/protocol.h> #include <net/ndisc.h> #include <net/ip.h> #include <net/ipv6.h> #include <net/transp_v6.h> #include <net/addrconf.h> #include <net/ip6_route.h> #include <net/inet_common.h> #include <net/inet_ecn.h> #include <net/sctp/sctp.h> #include <linux/uaccess.h> static inline int sctp_v6_addr_match_len(union sctp_addr *s1, <------><------><------><------><------> union sctp_addr *s2); static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr, <------><------><------> __be16 port); static int sctp_v6_cmp_addr(const union sctp_addr *addr1, <------><------><------> const union sctp_addr *addr2); /* Event handler for inet6 address addition/deletion events. * The sctp_local_addr_list needs to be protocted by a spin lock since * multiple notifiers (say IPv4 and IPv6) may be running at the same * time and thus corrupt the list. * The reader side is protected with RCU. */ static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, <------><------><------><------>void *ptr) { <------>struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; <------>struct sctp_sockaddr_entry *addr = NULL; <------>struct sctp_sockaddr_entry *temp; <------>struct net *net = dev_net(ifa->idev->dev); <------>int found = 0; <------>switch (ev) { <------>case NETDEV_UP: <------><------>addr = kzalloc(sizeof(*addr), GFP_ATOMIC); <------><------>if (addr) { <------><------><------>addr->a.v6.sin6_family = AF_INET6; <------><------><------>addr->a.v6.sin6_addr = ifa->addr; <------><------><------>addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; <------><------><------>addr->valid = 1; <------><------><------>spin_lock_bh(&net->sctp.local_addr_lock); <------><------><------>list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); <------><------><------>sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); <------><------><------>spin_unlock_bh(&net->sctp.local_addr_lock); <------><------>} <------><------>break; <------>case NETDEV_DOWN: <------><------>spin_lock_bh(&net->sctp.local_addr_lock); <------><------>list_for_each_entry_safe(addr, temp, <------><------><------><------><------>&net->sctp.local_addr_list, list) { <------><------><------>if (addr->a.sa.sa_family == AF_INET6 && <------><------><------><------><------>ipv6_addr_equal(&addr->a.v6.sin6_addr, <------><------><------><------><------><------>&ifa->addr)) { <------><------><------><------>sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); <------><------><------><------>found = 1; <------><------><------><------>addr->valid = 0; <------><------><------><------>list_del_rcu(&addr->list); <------><------><------><------>break; <------><------><------>} <------><------>} <------><------>spin_unlock_bh(&net->sctp.local_addr_lock); <------><------>if (found) <------><------><------>kfree_rcu(addr, rcu); <------><------>break; <------>} <------>return NOTIFY_DONE; } static struct notifier_block sctp_inet6addr_notifier = { <------>.notifier_call = sctp_inet6addr_event, }; /* ICMP error handler. */ static int sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, <------><------><------>u8 type, u8 code, int offset, __be32 info) { <------>struct inet6_dev *idev; <------>struct sock *sk; <------>struct sctp_association *asoc; <------>struct sctp_transport *transport; <------>struct ipv6_pinfo *np; <------>__u16 saveip, savesctp; <------>int err, ret = 0; <------>struct net *net = dev_net(skb->dev); <------>idev = in6_dev_get(skb->dev); <------>/* Fix up skb to look at the embedded net header. */ <------>saveip = skb->network_header; <------>savesctp = skb->transport_header; <------>skb_reset_network_header(skb); <------>skb_set_transport_header(skb, offset); <------>sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport); <------>/* Put back, the original pointers. */ <------>skb->network_header = saveip; <------>skb->transport_header = savesctp; <------>if (!sk) { <------><------>__ICMP6_INC_STATS(net, idev, ICMP6_MIB_INERRORS); <------><------>ret = -ENOENT; <------><------>goto out; <------>} <------>/* Warning: The sock lock is held. Remember to call <------> * sctp_err_finish! <------> */ <------>switch (type) { <------>case ICMPV6_PKT_TOOBIG: <------><------>if (ip6_sk_accept_pmtu(sk)) <------><------><------>sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); <------><------>goto out_unlock; <------>case ICMPV6_PARAMPROB: <------><------>if (ICMPV6_UNK_NEXTHDR == code) { <------><------><------>sctp_icmp_proto_unreachable(sk, asoc, transport); <------><------><------>goto out_unlock; <------><------>} <------><------>break; <------>case NDISC_REDIRECT: <------><------>sctp_icmp_redirect(sk, transport, skb); <------><------>goto out_unlock; <------>default: <------><------>break; <------>} <------>np = inet6_sk(sk); <------>icmpv6_err_convert(type, code, &err); <------>if (!sock_owned_by_user(sk) && np->recverr) { <------><------>sk->sk_err = err; <------><------>sk->sk_error_report(sk); <------>} else { /* Only an error on timeout */ <------><------>sk->sk_err_soft = err; <------>} out_unlock: <------>sctp_err_finish(sk, transport); out: <------>if (likely(idev != NULL)) <------><------>in6_dev_put(idev); <------>return ret; } static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport) { <------>struct sock *sk = skb->sk; <------>struct ipv6_pinfo *np = inet6_sk(sk); <------>struct flowi6 *fl6 = &transport->fl.u.ip6; <------>__u8 tclass = np->tclass; <------>int res; <------>pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb, <------><------> skb->len, &fl6->saddr, &fl6->daddr); <------>if (transport->dscp & SCTP_DSCP_SET_MASK) <------><------>tclass = transport->dscp & SCTP_DSCP_VAL_MASK; <------>if (INET_ECN_is_capable(tclass)) <------><------>IP6_ECN_flow_xmit(sk, fl6->flowlabel); <------>if (!(transport->param_flags & SPP_PMTUD_ENABLE)) <------><------>skb->ignore_df = 1; <------>SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS); <------>rcu_read_lock(); <------>res = ip6_xmit(sk, skb, fl6, sk->sk_mark, rcu_dereference(np->opt), <------><------> tclass, sk->sk_priority); <------>rcu_read_unlock(); <------>return res; } /* Returns the dst cache entry for the given source and destination ip * addresses. */ static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr, <------><------><------> struct flowi *fl, struct sock *sk) { <------>struct sctp_association *asoc = t->asoc; <------>struct dst_entry *dst = NULL; <------>struct flowi _fl; <------>struct flowi6 *fl6 = &_fl.u.ip6; <------>struct sctp_bind_addr *bp; <------>struct ipv6_pinfo *np = inet6_sk(sk); <------>struct sctp_sockaddr_entry *laddr; <------>union sctp_addr *daddr = &t->ipaddr; <------>union sctp_addr dst_saddr; <------>struct in6_addr *final_p, final; <------>enum sctp_scope scope; <------>__u8 matchlen = 0; <------>memset(&_fl, 0, sizeof(_fl)); <------>fl6->daddr = daddr->v6.sin6_addr; <------>fl6->fl6_dport = daddr->v6.sin6_port; <------>fl6->flowi6_proto = IPPROTO_SCTP; <------>if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) <------><------>fl6->flowi6_oif = daddr->v6.sin6_scope_id; <------>else if (asoc) <------><------>fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if; <------>if (t->flowlabel & SCTP_FLOWLABEL_SET_MASK) <------><------>fl6->flowlabel = htonl(t->flowlabel & SCTP_FLOWLABEL_VAL_MASK); <------>if (np->sndflow && (fl6->flowlabel & IPV6_FLOWLABEL_MASK)) { <------><------>struct ip6_flowlabel *flowlabel; <------><------>flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); <------><------>if (IS_ERR(flowlabel)) <------><------><------>goto out; <------><------>fl6_sock_release(flowlabel); <------>} <------>pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr); <------>if (asoc) <------><------>fl6->fl6_sport = htons(asoc->base.bind_addr.port); <------>if (saddr) { <------><------>fl6->saddr = saddr->v6.sin6_addr; <------><------>if (!fl6->fl6_sport) <------><------><------>fl6->fl6_sport = saddr->v6.sin6_port; <------><------>pr_debug("src=%pI6 - ", &fl6->saddr); <------>} <------>rcu_read_lock(); <------>final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); <------>rcu_read_unlock(); <------>dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p); <------>if (!asoc || saddr) { <------><------>t->dst = dst; <------><------>memcpy(fl, &_fl, sizeof(_fl)); <------><------>goto out; <------>} <------>bp = &asoc->base.bind_addr; <------>scope = sctp_scope(daddr); <------>/* ip6_dst_lookup has filled in the fl6->saddr for us. Check <------> * to see if we can use it. <------> */ <------>if (!IS_ERR(dst)) { <------><------>/* Walk through the bind address list and look for a bind <------><------> * address that matches the source address of the returned dst. <------><------> */ <------><------>sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port)); <------><------>rcu_read_lock(); <------><------>list_for_each_entry_rcu(laddr, &bp->address_list, list) { <------><------><------>if (!laddr->valid || laddr->state == SCTP_ADDR_DEL || <------><------><------> (laddr->state != SCTP_ADDR_SRC && <------><------><------> !asoc->src_out_of_asoc_ok)) <------><------><------><------>continue; <------><------><------>/* Do not compare against v4 addrs */ <------><------><------>if ((laddr->a.sa.sa_family == AF_INET6) && <------><------><------> (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) { <------><------><------><------>rcu_read_unlock(); <------><------><------><------>t->dst = dst; <------><------><------><------>memcpy(fl, &_fl, sizeof(_fl)); <------><------><------><------>goto out; <------><------><------>} <------><------>} <------><------>rcu_read_unlock(); <------><------>/* None of the bound addresses match the source address of the <------><------> * dst. So release it. <------><------> */ <------><------>dst_release(dst); <------><------>dst = NULL; <------>} <------>/* Walk through the bind address list and try to get the <------> * best source address for a given destination. <------> */ <------>rcu_read_lock(); <------>list_for_each_entry_rcu(laddr, &bp->address_list, list) { <------><------>struct dst_entry *bdst; <------><------>__u8 bmatchlen; <------><------>if (!laddr->valid || <------><------> laddr->state != SCTP_ADDR_SRC || <------><------> laddr->a.sa.sa_family != AF_INET6 || <------><------> scope > sctp_scope(&laddr->a)) <------><------><------>continue; <------><------>fl6->saddr = laddr->a.v6.sin6_addr; <------><------>fl6->fl6_sport = laddr->a.v6.sin6_port; <------><------>final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); <------><------>bdst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p); <------><------>if (IS_ERR(bdst)) <------><------><------>continue; <------><------>if (ipv6_chk_addr(dev_net(bdst->dev), <------><------><------><------> &laddr->a.v6.sin6_addr, bdst->dev, 1)) { <------><------><------>if (!IS_ERR_OR_NULL(dst)) <------><------><------><------>dst_release(dst); <------><------><------>dst = bdst; <------><------><------>t->dst = dst; <------><------><------>memcpy(fl, &_fl, sizeof(_fl)); <------><------><------>break; <------><------>} <------><------>bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); <------><------>if (matchlen > bmatchlen) { <------><------><------>dst_release(bdst); <------><------><------>continue; <------><------>} <------><------>if (!IS_ERR_OR_NULL(dst)) <------><------><------>dst_release(dst); <------><------>dst = bdst; <------><------>matchlen = bmatchlen; <------><------>t->dst = dst; <------><------>memcpy(fl, &_fl, sizeof(_fl)); <------>} <------>rcu_read_unlock(); out: <------>if (!IS_ERR_OR_NULL(dst)) { <------><------>struct rt6_info *rt; <------><------>rt = (struct rt6_info *)dst; <------><------>t->dst_cookie = rt6_get_cookie(rt); <------><------>pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n", <------><------><------> &rt->rt6i_dst.addr, rt->rt6i_dst.plen, <------><------><------> &fl->u.ip6.saddr); <------>} else { <------><------>t->dst = NULL; <------><------>pr_debug("no route\n"); <------>} } /* Returns the number of consecutive initial bits that match in the 2 ipv6 * addresses. */ static inline int sctp_v6_addr_match_len(union sctp_addr *s1, <------><------><------><------><------> union sctp_addr *s2) { <------>return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr); } /* Fills in the source address(saddr) based on the destination address(daddr) * and asoc's bind address list. */ static void sctp_v6_get_saddr(struct sctp_sock *sk, <------><------><------> struct sctp_transport *t, <------><------><------> struct flowi *fl) { <------>struct flowi6 *fl6 = &fl->u.ip6; <------>union sctp_addr *saddr = &t->saddr; <------>pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst); <------>if (t->dst) { <------><------>saddr->v6.sin6_family = AF_INET6; <------><------>saddr->v6.sin6_addr = fl6->saddr; <------>} } /* Make a copy of all potential local addresses. */ static void sctp_v6_copy_addrlist(struct list_head *addrlist, <------><------><------><------> struct net_device *dev) { <------>struct inet6_dev *in6_dev; <------>struct inet6_ifaddr *ifp; <------>struct sctp_sockaddr_entry *addr; <------>rcu_read_lock(); <------>if ((in6_dev = __in6_dev_get(dev)) == NULL) { <------><------>rcu_read_unlock(); <------><------>return; <------>} <------>read_lock_bh(&in6_dev->lock); <------>list_for_each_entry(ifp, &in6_dev->addr_list, if_list) { <------><------>/* Add the address to the local list. */ <------><------>addr = kzalloc(sizeof(*addr), GFP_ATOMIC); <------><------>if (addr) { <------><------><------>addr->a.v6.sin6_family = AF_INET6; <------><------><------>addr->a.v6.sin6_addr = ifp->addr; <------><------><------>addr->a.v6.sin6_scope_id = dev->ifindex; <------><------><------>addr->valid = 1; <------><------><------>INIT_LIST_HEAD(&addr->list); <------><------><------>list_add_tail(&addr->list, addrlist); <------><------>} <------>} <------>read_unlock_bh(&in6_dev->lock); <------>rcu_read_unlock(); } /* Copy over any ip options */ static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk) { <------>struct ipv6_pinfo *newnp, *np = inet6_sk(sk); <------>struct ipv6_txoptions *opt; <------>newnp = inet6_sk(newsk); <------>rcu_read_lock(); <------>opt = rcu_dereference(np->opt); <------>if (opt) { <------><------>opt = ipv6_dup_options(newsk, opt); <------><------>if (!opt) <------><------><------>pr_err("%s: Failed to copy ip options\n", __func__); <------>} <------>RCU_INIT_POINTER(newnp->opt, opt); <------>rcu_read_unlock(); } /* Account for the IP options */ static int sctp_v6_ip_options_len(struct sock *sk) { <------>struct ipv6_pinfo *np = inet6_sk(sk); <------>struct ipv6_txoptions *opt; <------>int len = 0; <------>rcu_read_lock(); <------>opt = rcu_dereference(np->opt); <------>if (opt) <------><------>len = opt->opt_flen + opt->opt_nflen; <------>rcu_read_unlock(); <------>return len; } /* Initialize a sockaddr_storage from in incoming skb. */ static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb, <------><------><------> int is_saddr) { <------>/* Always called on head skb, so this is safe */ <------>struct sctphdr *sh = sctp_hdr(skb); <------>struct sockaddr_in6 *sa = &addr->v6; <------>addr->v6.sin6_family = AF_INET6; <------>addr->v6.sin6_flowinfo = 0; /* FIXME */ <------>addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; <------>if (is_saddr) { <------><------>sa->sin6_port = sh->source; <------><------>sa->sin6_addr = ipv6_hdr(skb)->saddr; <------>} else { <------><------>sa->sin6_port = sh->dest; <------><------>sa->sin6_addr = ipv6_hdr(skb)->daddr; <------>} } /* Initialize an sctp_addr from a socket. */ static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) { <------>addr->v6.sin6_family = AF_INET6; <------>addr->v6.sin6_port = 0; <------>addr->v6.sin6_addr = sk->sk_v6_rcv_saddr; } /* Initialize sk->sk_rcv_saddr from sctp_addr. */ static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) { <------>if (addr->sa.sa_family == AF_INET) { <------><------>sk->sk_v6_rcv_saddr.s6_addr32[0] = 0; <------><------>sk->sk_v6_rcv_saddr.s6_addr32[1] = 0; <------><------>sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); <------><------>sk->sk_v6_rcv_saddr.s6_addr32[3] = <------><------><------>addr->v4.sin_addr.s_addr; <------>} else { <------><------>sk->sk_v6_rcv_saddr = addr->v6.sin6_addr; <------>} } /* Initialize sk->sk_daddr from sctp_addr. */ static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) { <------>if (addr->sa.sa_family == AF_INET) { <------><------>sk->sk_v6_daddr.s6_addr32[0] = 0; <------><------>sk->sk_v6_daddr.s6_addr32[1] = 0; <------><------>sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff); <------><------>sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; <------>} else { <------><------>sk->sk_v6_daddr = addr->v6.sin6_addr; <------>} } /* Initialize a sctp_addr from an address parameter. */ static bool sctp_v6_from_addr_param(union sctp_addr *addr, <------><------><------><------> union sctp_addr_param *param, <------><------><------><------> __be16 port, int iif) { <------>if (ntohs(param->v6.param_hdr.length) < sizeof(struct sctp_ipv6addr_param)) <------><------>return false; <------>addr->v6.sin6_family = AF_INET6; <------>addr->v6.sin6_port = port; <------>addr->v6.sin6_flowinfo = 0; /* BUG */ <------>addr->v6.sin6_addr = param->v6.addr; <------>addr->v6.sin6_scope_id = iif; <------>return true; } /* Initialize an address parameter from a sctp_addr and return the length * of the address parameter. */ static int sctp_v6_to_addr_param(const union sctp_addr *addr, <------><------><------><------> union sctp_addr_param *param) { <------>int length = sizeof(struct sctp_ipv6addr_param); <------>param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; <------>param->v6.param_hdr.length = htons(length); <------>param->v6.addr = addr->v6.sin6_addr; <------>return length; } /* Initialize a sctp_addr from struct in6_addr. */ static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr, <------><------><------> __be16 port) { <------>addr->sa.sa_family = AF_INET6; <------>addr->v6.sin6_port = port; <------>addr->v6.sin6_flowinfo = 0; <------>addr->v6.sin6_addr = *saddr; <------>addr->v6.sin6_scope_id = 0; } static int __sctp_v6_cmp_addr(const union sctp_addr *addr1, <------><------><------> const union sctp_addr *addr2) { <------>if (addr1->sa.sa_family != addr2->sa.sa_family) { <------><------>if (addr1->sa.sa_family == AF_INET && <------><------> addr2->sa.sa_family == AF_INET6 && <------><------> ipv6_addr_v4mapped(&addr2->v6.sin6_addr) && <------><------> addr2->v6.sin6_addr.s6_addr32[3] == <------><------> addr1->v4.sin_addr.s_addr) <------><------><------>return 1; <------><------>if (addr2->sa.sa_family == AF_INET && <------><------> addr1->sa.sa_family == AF_INET6 && <------><------> ipv6_addr_v4mapped(&addr1->v6.sin6_addr) && <------><------> addr1->v6.sin6_addr.s6_addr32[3] == <------><------> addr2->v4.sin_addr.s_addr) <------><------><------>return 1; <------><------>return 0; <------>} <------>if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) <------><------>return 0; <------>/* If this is a linklocal address, compare the scope_id. */ <------>if ((ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) && <------> addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && <------> addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id) <------><------>return 0; <------>return 1; } /* Compare addresses exactly. * v4-mapped-v6 is also in consideration. */ static int sctp_v6_cmp_addr(const union sctp_addr *addr1, <------><------><------> const union sctp_addr *addr2) { <------>return __sctp_v6_cmp_addr(addr1, addr2) && <------> addr1->v6.sin6_port == addr2->v6.sin6_port; } /* Initialize addr struct to INADDR_ANY. */ static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) { <------>memset(addr, 0x00, sizeof(union sctp_addr)); <------>addr->v6.sin6_family = AF_INET6; <------>addr->v6.sin6_port = port; } /* Is this a wildcard address? */ static int sctp_v6_is_any(const union sctp_addr *addr) { <------>return ipv6_addr_any(&addr->v6.sin6_addr); } /* Should this be available for binding? */ static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) { <------>int type; <------>struct net *net = sock_net(&sp->inet.sk); <------>const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr; <------>type = ipv6_addr_type(in6); <------>if (IPV6_ADDR_ANY == type) <------><------>return 1; <------>if (type == IPV6_ADDR_MAPPED) { <------><------>if (sp && ipv6_only_sock(sctp_opt2sk(sp))) <------><------><------>return 0; <------><------>sctp_v6_map_v4(addr); <------><------>return sctp_get_af_specific(AF_INET)->available(addr, sp); <------>} <------>if (!(type & IPV6_ADDR_UNICAST)) <------><------>return 0; <------>return ipv6_can_nonlocal_bind(net, &sp->inet) || <------> ipv6_chk_addr(net, in6, NULL, 0); } /* This function checks if the address is a valid address to be used for * SCTP. * * Output: * Return 0 - If the address is a non-unicast or an illegal address. * Return 1 - If the address is a unicast. */ static int sctp_v6_addr_valid(union sctp_addr *addr, <------><------><------> struct sctp_sock *sp, <------><------><------> const struct sk_buff *skb) { <------>int ret = ipv6_addr_type(&addr->v6.sin6_addr); <------>/* Support v4-mapped-v6 address. */ <------>if (ret == IPV6_ADDR_MAPPED) { <------><------>/* Note: This routine is used in input, so v4-mapped-v6 <------><------> * are disallowed here when there is no sctp_sock. <------><------> */ <------><------>if (sp && ipv6_only_sock(sctp_opt2sk(sp))) <------><------><------>return 0; <------><------>sctp_v6_map_v4(addr); <------><------>return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); <------>} <------>/* Is this a non-unicast address */ <------>if (!(ret & IPV6_ADDR_UNICAST)) <------><------>return 0; <------>return 1; } /* What is the scope of 'addr'? */ static enum sctp_scope sctp_v6_scope(union sctp_addr *addr) { <------>enum sctp_scope retval; <------>int v6scope; <------>/* The IPv6 scope is really a set of bit fields. <------> * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. <------> */ <------>v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); <------>switch (v6scope) { <------>case IFA_HOST: <------><------>retval = SCTP_SCOPE_LOOPBACK; <------><------>break; <------>case IFA_LINK: <------><------>retval = SCTP_SCOPE_LINK; <------><------>break; <------>case IFA_SITE: <------><------>retval = SCTP_SCOPE_PRIVATE; <------><------>break; <------>default: <------><------>retval = SCTP_SCOPE_GLOBAL; <------><------>break; <------>} <------>return retval; } /* Create and initialize a new sk for the socket to be returned by accept(). */ static struct sock *sctp_v6_create_accept_sk(struct sock *sk, <------><------><------><------><------> struct sctp_association *asoc, <------><------><------><------><------> bool kern) { <------>struct sock *newsk; <------>struct ipv6_pinfo *newnp, *np = inet6_sk(sk); <------>struct sctp6_sock *newsctp6sk; <------>newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, kern); <------>if (!newsk) <------><------>goto out; <------>sock_init_data(NULL, newsk); <------>sctp_copy_sock(newsk, sk, asoc); <------>sock_reset_flag(sk, SOCK_ZAPPED); <------>newsctp6sk = (struct sctp6_sock *)newsk; <------>inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; <------>sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped; <------>newnp = inet6_sk(newsk); <------>memcpy(newnp, np, sizeof(struct ipv6_pinfo)); <------>newnp->ipv6_mc_list = NULL; <------>newnp->ipv6_ac_list = NULL; <------>newnp->ipv6_fl_list = NULL; <------>sctp_v6_copy_ip_options(sk, newsk); <------>/* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() <------> * and getpeername(). <------> */ <------>sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); <------>newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr; <------>sk_refcnt_debug_inc(newsk); <------>if (newsk->sk_prot->init(newsk)) { <------><------>sk_common_release(newsk); <------><------>newsk = NULL; <------>} out: <------>return newsk; } /* Format a sockaddr for return to user space. This makes sure the return is * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option. */ static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr) { <------>if (sp->v4mapped) { <------><------>if (addr->sa.sa_family == AF_INET) <------><------><------>sctp_v4_map_v6(addr); <------>} else { <------><------>if (addr->sa.sa_family == AF_INET6 && <------><------> ipv6_addr_v4mapped(&addr->v6.sin6_addr)) <------><------><------>sctp_v6_map_v4(addr); <------>} <------>if (addr->sa.sa_family == AF_INET) { <------><------>memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); <------><------>return sizeof(struct sockaddr_in); <------>} <------>return sizeof(struct sockaddr_in6); } /* Where did this skb come from? */ static int sctp_v6_skb_iif(const struct sk_buff *skb) { <------>return IP6CB(skb)->iif; } /* Was this packet marked by Explicit Congestion Notification? */ static int sctp_v6_is_ce(const struct sk_buff *skb) { <------>return *((__u32 *)(ipv6_hdr(skb))) & (__force __u32)htonl(1 << 20); } /* Dump the v6 addr to the seq file. */ static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) { <------>seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr); } static void sctp_v6_ecn_capable(struct sock *sk) { <------>inet6_sk(sk)->tclass |= INET_ECN_ECT_0; } /* Initialize a PF_INET msgname from a ulpevent. */ static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, <------><------><------><------> char *msgname, int *addrlen) { <------>union sctp_addr *addr; <------>struct sctp_association *asoc; <------>union sctp_addr *paddr; <------>if (!msgname) <------><------>return; <------>addr = (union sctp_addr *)msgname; <------>asoc = event->asoc; <------>paddr = &asoc->peer.primary_addr; <------>if (paddr->sa.sa_family == AF_INET) { <------><------>addr->v4.sin_family = AF_INET; <------><------>addr->v4.sin_port = htons(asoc->peer.port); <------><------>addr->v4.sin_addr = paddr->v4.sin_addr; <------>} else { <------><------>addr->v6.sin6_family = AF_INET6; <------><------>addr->v6.sin6_flowinfo = 0; <------><------>if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) <------><------><------>addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id; <------><------>else <------><------><------>addr->v6.sin6_scope_id = 0; <------><------>addr->v6.sin6_port = htons(asoc->peer.port); <------><------>addr->v6.sin6_addr = paddr->v6.sin6_addr; <------>} <------>*addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr); } /* Initialize a msg_name from an inbound skb. */ static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, <------><------><------><------> int *addr_len) { <------>union sctp_addr *addr; <------>struct sctphdr *sh; <------>if (!msgname) <------><------>return; <------>addr = (union sctp_addr *)msgname; <------>sh = sctp_hdr(skb); <------>if (ip_hdr(skb)->version == 4) { <------><------>addr->v4.sin_family = AF_INET; <------><------>addr->v4.sin_port = sh->source; <------><------>addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr; <------>} else { <------><------>addr->v6.sin6_family = AF_INET6; <------><------>addr->v6.sin6_flowinfo = 0; <------><------>addr->v6.sin6_port = sh->source; <------><------>addr->v6.sin6_addr = ipv6_hdr(skb)->saddr; <------><------>if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) <------><------><------>addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb); <------><------>else <------><------><------>addr->v6.sin6_scope_id = 0; <------>} <------>*addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr); } /* Do we support this AF? */ static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) { <------>switch (family) { <------>case AF_INET6: <------><------>return 1; <------>/* v4-mapped-v6 addresses */ <------>case AF_INET: <------><------>if (!__ipv6_only_sock(sctp_opt2sk(sp))) <------><------><------>return 1; <------><------>fallthrough; <------>default: <------><------>return 0; <------>} } /* Address matching with wildcards allowed. This extra level * of indirection lets us choose whether a PF_INET6 should * disallow any v4 addresses if we so choose. */ static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, <------><------><------> const union sctp_addr *addr2, <------><------><------> struct sctp_sock *opt) { <------>struct sock *sk = sctp_opt2sk(opt); <------>struct sctp_af *af1, *af2; <------>af1 = sctp_get_af_specific(addr1->sa.sa_family); <------>af2 = sctp_get_af_specific(addr2->sa.sa_family); <------>if (!af1 || !af2) <------><------>return 0; <------>/* If the socket is IPv6 only, v4 addrs will not match */ <------>if (__ipv6_only_sock(sk) && af1 != af2) <------><------>return 0; <------>/* Today, wildcard AF_INET/AF_INET6. */ <------>if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2)) <------><------>return 1; <------>if (addr1->sa.sa_family == AF_INET && addr2->sa.sa_family == AF_INET) <------><------>return addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr; <------>return __sctp_v6_cmp_addr(addr1, addr2); } /* Verify that the provided sockaddr looks bindable. Common verification, * has already been taken care of. */ static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) { <------>struct sctp_af *af; <------>/* ASSERT: address family has already been verified. */ <------>if (addr->sa.sa_family != AF_INET6) <------><------>af = sctp_get_af_specific(addr->sa.sa_family); <------>else { <------><------>int type = ipv6_addr_type(&addr->v6.sin6_addr); <------><------>struct net_device *dev; <------><------>if (type & IPV6_ADDR_LINKLOCAL) { <------><------><------>struct net *net; <------><------><------>if (!addr->v6.sin6_scope_id) <------><------><------><------>return 0; <------><------><------>net = sock_net(&opt->inet.sk); <------><------><------>rcu_read_lock(); <------><------><------>dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id); <------><------><------>if (!dev || !(ipv6_can_nonlocal_bind(net, &opt->inet) || <------><------><------><------> ipv6_chk_addr(net, &addr->v6.sin6_addr, <------><------><------><------><------><------> dev, 0))) { <------><------><------><------>rcu_read_unlock(); <------><------><------><------>return 0; <------><------><------>} <------><------><------>rcu_read_unlock(); <------><------>} <------><------>af = opt->pf->af; <------>} <------>return af->available(addr, opt); } /* Verify that the provided sockaddr looks sendable. Common verification, * has already been taken care of. */ static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) { <------>struct sctp_af *af = NULL; <------>/* ASSERT: address family has already been verified. */ <------>if (addr->sa.sa_family != AF_INET6) <------><------>af = sctp_get_af_specific(addr->sa.sa_family); <------>else { <------><------>int type = ipv6_addr_type(&addr->v6.sin6_addr); <------><------>struct net_device *dev; <------><------>if (type & IPV6_ADDR_LINKLOCAL) { <------><------><------>if (!addr->v6.sin6_scope_id) <------><------><------><------>return 0; <------><------><------>rcu_read_lock(); <------><------><------>dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk), <------><------><------><------><------><------> addr->v6.sin6_scope_id); <------><------><------>rcu_read_unlock(); <------><------><------>if (!dev) <------><------><------><------>return 0; <------><------>} <------><------>af = opt->pf->af; <------>} <------>return af != NULL; } /* Fill in Supported Address Type information for INIT and INIT-ACK * chunks. Note: In the future, we may want to look at sock options * to determine whether a PF_INET6 socket really wants to have IPV4 * addresses. * Returns number of addresses supported. */ static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, <------><------><------><------> __be16 *types) { <------>types[0] = SCTP_PARAM_IPV6_ADDRESS; <------>if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) { <------><------>types[1] = SCTP_PARAM_IPV4_ADDRESS; <------><------>return 2; <------>} <------>return 1; } /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */ static int sctp_getname(struct socket *sock, struct sockaddr *uaddr, <------><------><------>int peer) { <------>int rc; <------>rc = inet6_getname(sock, uaddr, peer); <------>if (rc < 0) <------><------>return rc; <------>rc = sctp_v6_addr_to_user(sctp_sk(sock->sk), <------><------><------><------><------> (union sctp_addr *)uaddr); <------>return rc; } static const struct proto_ops inet6_seqpacket_ops = { <------>.family = PF_INET6, <------>.owner = THIS_MODULE, <------>.release = inet6_release, <------>.bind = inet6_bind, <------>.connect = sctp_inet_connect, <------>.socketpair = sock_no_socketpair, <------>.accept = inet_accept, <------>.getname = sctp_getname, <------>.poll = sctp_poll, <------>.ioctl = inet6_ioctl, <------>.gettstamp = sock_gettstamp, <------>.listen = sctp_inet_listen, <------>.shutdown = inet_shutdown, <------>.setsockopt = sock_common_setsockopt, <------>.getsockopt = sock_common_getsockopt, <------>.sendmsg = inet_sendmsg, <------>.recvmsg = inet_recvmsg, <------>.mmap = sock_no_mmap, #ifdef CONFIG_COMPAT <------>.compat_ioctl = inet6_compat_ioctl, #endif }; static struct inet_protosw sctpv6_seqpacket_protosw = { <------>.type = SOCK_SEQPACKET, <------>.protocol = IPPROTO_SCTP, <------>.prot = &sctpv6_prot, <------>.ops = &inet6_seqpacket_ops, <------>.flags = SCTP_PROTOSW_FLAG }; static struct inet_protosw sctpv6_stream_protosw = { <------>.type = SOCK_STREAM, <------>.protocol = IPPROTO_SCTP, <------>.prot = &sctpv6_prot, <------>.ops = &inet6_seqpacket_ops, <------>.flags = SCTP_PROTOSW_FLAG, }; static int sctp6_rcv(struct sk_buff *skb) { <------>return sctp_rcv(skb) ? -1 : 0; } static const struct inet6_protocol sctpv6_protocol = { <------>.handler = sctp6_rcv, <------>.err_handler = sctp_v6_err, <------>.flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, }; static struct sctp_af sctp_af_inet6 = { <------>.sa_family = AF_INET6, <------>.sctp_xmit = sctp_v6_xmit, <------>.setsockopt = ipv6_setsockopt, <------>.getsockopt = ipv6_getsockopt, <------>.get_dst = sctp_v6_get_dst, <------>.get_saddr = sctp_v6_get_saddr, <------>.copy_addrlist = sctp_v6_copy_addrlist, <------>.from_skb = sctp_v6_from_skb, <------>.from_sk = sctp_v6_from_sk, <------>.from_addr_param = sctp_v6_from_addr_param, <------>.to_addr_param = sctp_v6_to_addr_param, <------>.cmp_addr = sctp_v6_cmp_addr, <------>.scope = sctp_v6_scope, <------>.addr_valid = sctp_v6_addr_valid, <------>.inaddr_any = sctp_v6_inaddr_any, <------>.is_any = sctp_v6_is_any, <------>.available = sctp_v6_available, <------>.skb_iif = sctp_v6_skb_iif, <------>.is_ce = sctp_v6_is_ce, <------>.seq_dump_addr = sctp_v6_seq_dump_addr, <------>.ecn_capable = sctp_v6_ecn_capable, <------>.net_header_len = sizeof(struct ipv6hdr), <------>.sockaddr_len = sizeof(struct sockaddr_in6), <------>.ip_options_len = sctp_v6_ip_options_len, }; static struct sctp_pf sctp_pf_inet6 = { <------>.event_msgname = sctp_inet6_event_msgname, <------>.skb_msgname = sctp_inet6_skb_msgname, <------>.af_supported = sctp_inet6_af_supported, <------>.cmp_addr = sctp_inet6_cmp_addr, <------>.bind_verify = sctp_inet6_bind_verify, <------>.send_verify = sctp_inet6_send_verify, <------>.supported_addrs = sctp_inet6_supported_addrs, <------>.create_accept_sk = sctp_v6_create_accept_sk, <------>.addr_to_user = sctp_v6_addr_to_user, <------>.to_sk_saddr = sctp_v6_to_sk_saddr, <------>.to_sk_daddr = sctp_v6_to_sk_daddr, <------>.copy_ip_options = sctp_v6_copy_ip_options, <------>.af = &sctp_af_inet6, }; /* Initialize IPv6 support and register with socket layer. */ void sctp_v6_pf_init(void) { <------>/* Register the SCTP specific PF_INET6 functions. */ <------>sctp_register_pf(&sctp_pf_inet6, PF_INET6); <------>/* Register the SCTP specific AF_INET6 functions. */ <------>sctp_register_af(&sctp_af_inet6); } void sctp_v6_pf_exit(void) { <------>list_del(&sctp_af_inet6.list); } /* Initialize IPv6 support and register with socket layer. */ int sctp_v6_protosw_init(void) { <------>int rc; <------>rc = proto_register(&sctpv6_prot, 1); <------>if (rc) <------><------>return rc; <------>/* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ <------>inet6_register_protosw(&sctpv6_seqpacket_protosw); <------>inet6_register_protosw(&sctpv6_stream_protosw); <------>return 0; } void sctp_v6_protosw_exit(void) { <------>inet6_unregister_protosw(&sctpv6_seqpacket_protosw); <------>inet6_unregister_protosw(&sctpv6_stream_protosw); <------>proto_unregister(&sctpv6_prot); } /* Register with inet6 layer. */ int sctp_v6_add_protocol(void) { <------>/* Register notifier for inet6 address additions/deletions. */ <------>register_inet6addr_notifier(&sctp_inet6addr_notifier); <------>if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) <------><------>return -EAGAIN; <------>return 0; } /* Unregister with inet6 layer. */ void sctp_v6_del_protocol(void) { <------>inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); <------>unregister_inet6addr_notifier(&sctp_inet6addr_notifier); }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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