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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233// SPDX-License-Identifier: GPL-2.0-or-later/* * IPv6 specific functions of netfilter core * * Rusty Russell (C) 2000 * Patrick McHardy (C) 2006-2012 */#include <linux/kernel.h>#include <linux/init.h>#include <linux/ipv6.h>#include <linux/netfilter.h>#include <linux/netfilter_ipv6.h>#include <linux/export.h>#include <net/addrconf.h>#include <net/dst.h>#include <net/ipv6.h>#include <net/ip6_route.h>#include <net/xfrm.h>#include <net/netfilter/nf_queue.h>#include <net/netfilter/nf_conntrack_bridge.h>#include <net/netfilter/ipv6/nf_defrag_ipv6.h>#include "../bridge/br_private.h"
int ip6_route_me_harder(struct net *net, struct sock *sk_partial, struct sk_buff *skb){ const struct ipv6hdr *iph = ipv6_hdr(skb); struct sock *sk = sk_to_full_sk(sk_partial); struct net_device *dev = skb_dst_dev(skb); struct flow_keys flkeys; unsigned int hh_len; struct dst_entry *dst; int strict = (ipv6_addr_type(&iph->daddr) & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); struct flowi6 fl6 = { .flowi6_l3mdev = l3mdev_master_ifindex(dev), .flowi6_mark = skb->mark, .flowi6_uid = sock_net_uid(net, sk), .daddr = iph->daddr, .saddr = iph->saddr, .flowlabel = ip6_flowinfo(iph), }; int err;
if (sk && sk->sk_bound_dev_if) fl6.flowi6_oif = sk->sk_bound_dev_if; else if (strict) fl6.flowi6_oif = dev->ifindex;
fib6_rules_early_flow_dissect(net, skb, &fl6, &flkeys); dst = ip6_route_output(net, sk, &fl6); err = dst->error; if (err) { IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); net_dbg_ratelimited("ip6_route_me_harder: No more route\n"); dst_release(dst); return err; }
/* Drop old route. */ skb_dst_drop(skb);
skb_dst_set(skb, dst);
#ifdef CONFIG_XFRM if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && xfrm_decode_session(net, skb, flowi6_to_flowi(&fl6), AF_INET6) == 0) { /* ignore return value from skb_dstref_steal, xfrm_lookup takes * care of dropping the refcnt if needed. */ skb_dstref_steal(skb); dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); if (IS_ERR(dst)) return PTR_ERR(dst); skb_dst_set(skb, dst); }#endif
/* Change in oif may mean change in hh_len. */ hh_len = skb_dst_dev(skb)->hard_header_len; if (skb_headroom(skb) < hh_len && pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)), 0, GFP_ATOMIC)) return -ENOMEM;
return 0;}EXPORT_SYMBOL(ip6_route_me_harder);
int __nf_ip6_route(struct net *net, struct dst_entry **dst, struct flowi *fl, bool strict){ static const struct ipv6_pinfo fake_pinfo; static const struct inet_sock fake_sk = { /* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */ .sk.sk_bound_dev_if = 1, .pinet6 = (struct ipv6_pinfo *) &fake_pinfo, }; const void *sk = strict ? &fake_sk : NULL; struct dst_entry *result; int err;
result = ip6_route_output(net, sk, &fl->u.ip6); err = result->error; if (err) dst_release(result); else *dst = result; return err;}EXPORT_SYMBOL_GPL(__nf_ip6_route);
int br_ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, struct nf_bridge_frag_data *data, int (*output)(struct net *, struct sock *sk, const struct nf_bridge_frag_data *data, struct sk_buff *)){ int frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size; u8 tstamp_type = skb->tstamp_type; ktime_t tstamp = skb->tstamp; struct ip6_frag_state state; u8 *prevhdr, nexthdr = 0; unsigned int mtu, hlen, nexthdr_offset; int hroom, err = 0; __be32 frag_id;
err = ip6_find_1stfragopt(skb, &prevhdr); if (err < 0) goto blackhole; hlen = err; nexthdr = *prevhdr; nexthdr_offset = prevhdr - skb_network_header(skb);
mtu = skb->dev->mtu; if (frag_max_size > mtu || frag_max_size < IPV6_MIN_MTU) goto blackhole;
mtu = frag_max_size; if (mtu < hlen + sizeof(struct frag_hdr) + 8) goto blackhole; mtu -= hlen + sizeof(struct frag_hdr);
frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr, &ipv6_hdr(skb)->saddr);
if (skb->ip_summed == CHECKSUM_PARTIAL && (err = skb_checksum_help(skb))) goto blackhole;
prevhdr = skb_network_header(skb) + nexthdr_offset; hroom = LL_RESERVED_SPACE(skb->dev); if (skb_has_frag_list(skb)) { unsigned int first_len = skb_pagelen(skb); struct ip6_fraglist_iter iter; struct sk_buff *frag2;
if (first_len - hlen > mtu) goto blackhole;
if (skb_cloned(skb) || skb_headroom(skb) < (hroom + sizeof(struct frag_hdr))) goto slow_path;
skb_walk_frags(skb, frag2) { if (frag2->len > mtu) goto blackhole;
/* Partially cloned skb? */ if (skb_shared(frag2) || skb_headroom(frag2) < (hlen + hroom + sizeof(struct frag_hdr))) goto slow_path; }
err = ip6_fraglist_init(skb, hlen, prevhdr, nexthdr, frag_id, &iter); if (err < 0) goto blackhole;
for (;;) { /* Prepare header of the next frame, * before previous one went down. */ if (iter.frag) ip6_fraglist_prepare(skb, &iter);
skb_set_delivery_time(skb, tstamp, tstamp_type); err = output(net, sk, data, skb); if (err || !iter.frag) break;
skb = ip6_fraglist_next(&iter); }
kfree(iter.tmp_hdr); if (!err) return 0;
kfree_skb_list(iter.frag); return err; }slow_path: /* This is a linearized skbuff, the original geometry is lost for us. * This may also be a clone skbuff, we could preserve the geometry for * the copies but probably not worth the effort. */ ip6_frag_init(skb, hlen, mtu, skb->dev->needed_tailroom, LL_RESERVED_SPACE(skb->dev), prevhdr, nexthdr, frag_id, &state);
while (state.left > 0) { struct sk_buff *skb2;
skb2 = ip6_frag_next(skb, &state); if (IS_ERR(skb2)) { err = PTR_ERR(skb2); goto blackhole; }
skb_set_delivery_time(skb2, tstamp, tstamp_type); err = output(net, sk, data, skb2); if (err) goto blackhole; } consume_skb(skb); return err;
blackhole: kfree_skb(skb); return 0;}EXPORT_SYMBOL_GPL(br_ip6_fragment);