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net/ipv4/ip_output.c
39.4 KB
1da177e4c Linux-2.6.12-rc2 |
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/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * The Internet Protocol (IP) output module. * |
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* Authors: Ross Biro |
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Donald Becker, <becker@super.org> * Alan Cox, <Alan.Cox@linux.org> * Richard Underwood * Stefan Becker, <stefanb@yello.ping.de> * Jorge Cwik, <jorge@laser.satlink.net> * Arnt Gulbrandsen, <agulbra@nvg.unit.no> * Hirokazu Takahashi, <taka@valinux.co.jp> * * See ip_input.c for original log * * Fixes: * Alan Cox : Missing nonblock feature in ip_build_xmit. * Mike Kilburn : htons() missing in ip_build_xmit. |
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* Bradford Johnson: Fix faulty handling of some frames when |
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* no route is found. * Alexander Demenshin: Missing sk/skb free in ip_queue_xmit * (in case if packet not accepted by * output firewall rules) * Mike McLagan : Routing by source * Alexey Kuznetsov: use new route cache * Andi Kleen: Fix broken PMTU recovery and remove * some redundant tests. * Vitaly E. Lavrov : Transparent proxy revived after year coma. * Andi Kleen : Replace ip_reply with ip_send_reply. |
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* Andi Kleen : Split fast and slow ip_build_xmit path * for decreased register pressure on x86 * and more readibility. |
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* Marc Boucher : When call_out_firewall returns FW_QUEUE, * silently drop skb instead of failing with -EPERM. * Detlev Wengorz : Copy protocol for fragments. * Hirokazu Takahashi: HW checksumming for outgoing UDP * datagrams. * Hirokazu Takahashi: sendfile() on UDP works now. */ #include <asm/uaccess.h> |
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#include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> |
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#include <linux/mm.h> #include <linux/string.h> #include <linux/errno.h> |
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#include <linux/highmem.h> |
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#include <linux/slab.h> |
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#include <linux/socket.h> #include <linux/sockios.h> #include <linux/in.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/proc_fs.h> #include <linux/stat.h> #include <linux/init.h> #include <net/snmp.h> #include <net/ip.h> #include <net/protocol.h> #include <net/route.h> |
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#include <net/xfrm.h> |
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#include <linux/skbuff.h> #include <net/sock.h> #include <net/arp.h> #include <net/icmp.h> |
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#include <net/checksum.h> #include <net/inetpeer.h> |
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#include <linux/igmp.h> #include <linux/netfilter_ipv4.h> #include <linux/netfilter_bridge.h> #include <linux/mroute.h> #include <linux/netlink.h> |
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#include <linux/tcp.h> |
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|
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int sysctl_ip_default_ttl __read_mostly = IPDEFTTL; |
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EXPORT_SYMBOL(sysctl_ip_default_ttl); |
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/* Generate a checksum for an outgoing IP datagram. */ |
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void ip_send_check(struct iphdr *iph) |
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{ iph->check = 0; iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); } |
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EXPORT_SYMBOL(ip_send_check); |
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|
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int __ip_local_out(struct sk_buff *skb) { struct iphdr *iph = ip_hdr(skb); iph->tot_len = htons(skb->len); ip_send_check(iph); |
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return nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL, skb_dst(skb)->dev, dst_output); |
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} |
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int ip_local_out_sk(struct sock *sk, struct sk_buff *skb) |
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{ int err; err = __ip_local_out(skb); if (likely(err == 1)) |
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err = dst_output_sk(sk, skb); |
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return err; } |
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EXPORT_SYMBOL_GPL(ip_local_out_sk); |
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|
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static inline int ip_select_ttl(struct inet_sock *inet, struct dst_entry *dst) { int ttl = inet->uc_ttl; if (ttl < 0) |
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ttl = ip4_dst_hoplimit(dst); |
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return ttl; } |
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/* |
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* Add an ip header to a skbuff and send it out. * */ int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, |
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__be32 saddr, __be32 daddr, struct ip_options_rcu *opt) |
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{ struct inet_sock *inet = inet_sk(sk); |
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struct rtable *rt = skb_rtable(skb); |
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struct iphdr *iph; /* Build the IP header. */ |
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skb_push(skb, sizeof(struct iphdr) + (opt ? opt->opt.optlen : 0)); |
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skb_reset_network_header(skb); |
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iph = ip_hdr(skb); |
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iph->version = 4; iph->ihl = 5; iph->tos = inet->tos; |
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if (ip_dont_fragment(sk, &rt->dst)) |
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iph->frag_off = htons(IP_DF); else iph->frag_off = 0; |
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iph->ttl = ip_select_ttl(inet, &rt->dst); |
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iph->daddr = (opt && opt->opt.srr ? opt->opt.faddr : daddr); iph->saddr = saddr; |
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iph->protocol = sk->sk_protocol; |
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ip_select_ident(skb, sk); |
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|
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if (opt && opt->opt.optlen) { iph->ihl += opt->opt.optlen>>2; ip_options_build(skb, &opt->opt, daddr, rt, 0); |
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} |
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skb->priority = sk->sk_priority; |
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skb->mark = sk->sk_mark; |
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/* Send it out. */ |
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return ip_local_out(skb); |
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} |
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EXPORT_SYMBOL_GPL(ip_build_and_send_pkt); |
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static inline int ip_finish_output2(struct sk_buff *skb) { |
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struct dst_entry *dst = skb_dst(skb); |
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struct rtable *rt = (struct rtable *)dst; |
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struct net_device *dev = dst->dev; |
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unsigned int hh_len = LL_RESERVED_SPACE(dev); |
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struct neighbour *neigh; |
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u32 nexthop; |
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|
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if (rt->rt_type == RTN_MULTICAST) { IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUTMCAST, skb->len); } else if (rt->rt_type == RTN_BROADCAST) IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUTBCAST, skb->len); |
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|
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/* Be paranoid, rather than too clever. */ |
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if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { |
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struct sk_buff *skb2; skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev)); if (skb2 == NULL) { kfree_skb(skb); return -ENOMEM; } if (skb->sk) skb_set_owner_w(skb2, skb->sk); |
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consume_skb(skb); |
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skb = skb2; } |
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rcu_read_lock_bh(); |
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nexthop = (__force u32) rt_nexthop(rt, ip_hdr(skb)->daddr); |
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neigh = __ipv4_neigh_lookup_noref(dev, nexthop); if (unlikely(!neigh)) neigh = __neigh_create(&arp_tbl, &nexthop, dev, false); |
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if (!IS_ERR(neigh)) { |
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int res = dst_neigh_output(dst, neigh, skb); |
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|
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rcu_read_unlock_bh(); |
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return res; } |
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rcu_read_unlock_bh(); |
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|
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net_dbg_ratelimited("%s: No header cache and no neighbour! ", __func__); |
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kfree_skb(skb); return -EINVAL; } |
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static int ip_finish_output_gso(struct sk_buff *skb) { netdev_features_t features; struct sk_buff *segs; int ret = 0; /* common case: locally created skb or seglen is <= mtu */ if (((IPCB(skb)->flags & IPSKB_FORWARDED) == 0) || skb_gso_network_seglen(skb) <= ip_skb_dst_mtu(skb)) return ip_finish_output2(skb); /* Slowpath - GSO segment length is exceeding the dst MTU. * * This can happen in two cases: * 1) TCP GRO packet, DF bit not set * 2) skb arrived via virtio-net, we thus get TSO/GSO skbs directly * from host network stack. */ features = netif_skb_features(skb); segs = skb_gso_segment(skb, features & ~NETIF_F_GSO_MASK); |
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if (IS_ERR_OR_NULL(segs)) { |
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kfree_skb(skb); return -ENOMEM; } consume_skb(skb); do { struct sk_buff *nskb = segs->next; int err; segs->next = NULL; err = ip_fragment(segs, ip_finish_output2); if (err && ret == 0) ret = err; segs = nskb; } while (segs); return ret; } |
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static int ip_finish_output(struct sk_buff *skb) |
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{ |
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#if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM) /* Policy lookup after SNAT yielded a new policy */ |
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if (skb_dst(skb)->xfrm != NULL) { |
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IPCB(skb)->flags |= IPSKB_REROUTED; return dst_output(skb); } |
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#endif |
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if (skb_is_gso(skb)) return ip_finish_output_gso(skb); if (skb->len > ip_skb_dst_mtu(skb)) |
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return ip_fragment(skb, ip_finish_output2); |
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return ip_finish_output2(skb); |
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} |
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int ip_mc_output(struct sock *sk, struct sk_buff *skb) |
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{ |
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struct rtable *rt = skb_rtable(skb); |
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struct net_device *dev = rt->dst.dev; |
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/* * If the indicated interface is up and running, send the packet. */ |
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IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); |
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skb->dev = dev; skb->protocol = htons(ETH_P_IP); /* * Multicasts are looped back for other local users */ if (rt->rt_flags&RTCF_MULTICAST) { |
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if (sk_mc_loop(sk) |
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#ifdef CONFIG_IP_MROUTE /* Small optimization: do not loopback not local frames, which returned after forwarding; they will be dropped by ip_mr_input in any case. Note, that local frames are looped back to be delivered to local recipients. This check is duplicated in ip_mr_input at the moment. */ |
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&& ((rt->rt_flags & RTCF_LOCAL) || !(IPCB(skb)->flags & IPSKB_FORWARDED)) |
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#endif |
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) { |
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struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); if (newskb) |
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NF_HOOK(NFPROTO_IPV4, NF_INET_POST_ROUTING, newskb, NULL, newskb->dev, |
95603e229 net-next: add dev... |
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dev_loopback_xmit); |
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} /* Multicasts with ttl 0 must not go beyond the host */ |
eddc9ec53 [SK_BUFF]: Introd... |
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if (ip_hdr(skb)->ttl == 0) { |
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kfree_skb(skb); return 0; } } if (rt->rt_flags&RTCF_BROADCAST) { struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); if (newskb) |
9bbc768aa netfilter: ipv4: ... |
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NF_HOOK(NFPROTO_IPV4, NF_INET_POST_ROUTING, newskb, |
95603e229 net-next: add dev... |
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NULL, newskb->dev, dev_loopback_xmit); |
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} |
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return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, skb, NULL, skb->dev, ip_finish_output, |
48d5cad87 [XFRM]: Fix SNAT-... |
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!(IPCB(skb)->flags & IPSKB_REROUTED)); |
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} |
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int ip_output(struct sock *sk, struct sk_buff *skb) |
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{ |
adf30907d net: skb->dst acc... |
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struct net_device *dev = skb_dst(skb)->dev; |
1bd9bef6f [NETFILTER]: Call... |
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|
edf391ff1 snmp: add missing... |
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IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); |
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|
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skb->dev = dev; skb->protocol = htons(ETH_P_IP); |
9bbc768aa netfilter: ipv4: ... |
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return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, skb, NULL, dev, |
e905a9eda [NET] IPV4: Fix w... |
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ip_finish_output, |
48d5cad87 [XFRM]: Fix SNAT-... |
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!(IPCB(skb)->flags & IPSKB_REROUTED)); |
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} |
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/* * copy saddr and daddr, possibly using 64bit load/stores * Equivalent to : * iph->saddr = fl4->saddr; * iph->daddr = fl4->daddr; */ static void ip_copy_addrs(struct iphdr *iph, const struct flowi4 *fl4) { BUILD_BUG_ON(offsetof(typeof(*fl4), daddr) != offsetof(typeof(*fl4), saddr) + sizeof(fl4->saddr)); memcpy(&iph->saddr, &fl4->saddr, sizeof(fl4->saddr) + sizeof(fl4->daddr)); } |
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/* Note: skb->sk can be different from sk, in case of tunnels */ int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl) |
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{ |
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struct inet_sock *inet = inet_sk(sk); |
f6d8bd051 inet: add RCU pro... |
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struct ip_options_rcu *inet_opt; |
b57ae01a8 ipv4: Use cork fl... |
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struct flowi4 *fl4; |
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struct rtable *rt; struct iphdr *iph; |
ab6e3feba net: No dst refco... |
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int res; |
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/* Skip all of this if the packet is already routed, * f.e. by something like SCTP. */ |
ab6e3feba net: No dst refco... |
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rcu_read_lock(); |
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inet_opt = rcu_dereference(inet->inet_opt); |
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fl4 = &fl->u.ip4; |
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rt = skb_rtable(skb); |
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if (rt != NULL) goto packet_routed; /* Make sure we can route this packet. */ rt = (struct rtable *)__sk_dst_check(sk, 0); if (rt == NULL) { |
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__be32 daddr; |
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/* Use correct destination address if we have options. */ |
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daddr = inet->inet_daddr; |
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if (inet_opt && inet_opt->opt.srr) daddr = inet_opt->opt.faddr; |
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|
78fbfd8a6 ipv4: Create and ... |
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/* If this fails, retransmit mechanism of transport layer will * keep trying until route appears or the connection times * itself out. */ |
b57ae01a8 ipv4: Use cork fl... |
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rt = ip_route_output_ports(sock_net(sk), fl4, sk, |
78fbfd8a6 ipv4: Create and ... |
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daddr, inet->inet_saddr, inet->inet_dport, inet->inet_sport, sk->sk_protocol, RT_CONN_FLAGS(sk), sk->sk_bound_dev_if); if (IS_ERR(rt)) goto no_route; |
d8d1f30b9 net-next: remove ... |
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sk_setup_caps(sk, &rt->dst); |
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} |
d8d1f30b9 net-next: remove ... |
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skb_dst_set_noref(skb, &rt->dst); |
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packet_routed: |
155e8336c ipv4: introduce r... |
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if (inet_opt && inet_opt->opt.is_strictroute && rt->rt_uses_gateway) |
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goto no_route; /* OK, we know where to send it, allocate and build IP header. */ |
f6d8bd051 inet: add RCU pro... |
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skb_push(skb, sizeof(struct iphdr) + (inet_opt ? inet_opt->opt.optlen : 0)); |
8856dfa3e [SK_BUFF]: Use sk... |
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skb_reset_network_header(skb); |
eddc9ec53 [SK_BUFF]: Introd... |
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iph = ip_hdr(skb); |
714e85be3 [IPV6]: Assorted ... |
405 |
*((__be16 *)iph) = htons((4 << 12) | (5 << 8) | (inet->tos & 0xff)); |
60ff74673 net: rename local... |
406 |
if (ip_dont_fragment(sk, &rt->dst) && !skb->ignore_df) |
1da177e4c Linux-2.6.12-rc2 |
407 408 409 |
iph->frag_off = htons(IP_DF); else iph->frag_off = 0; |
d8d1f30b9 net-next: remove ... |
410 |
iph->ttl = ip_select_ttl(inet, &rt->dst); |
1da177e4c Linux-2.6.12-rc2 |
411 |
iph->protocol = sk->sk_protocol; |
84f9307c5 ipv4: use a 64bit... |
412 |
ip_copy_addrs(iph, fl4); |
1da177e4c Linux-2.6.12-rc2 |
413 |
/* Transport layer set skb->h.foo itself. */ |
f6d8bd051 inet: add RCU pro... |
414 415 416 |
if (inet_opt && inet_opt->opt.optlen) { iph->ihl += inet_opt->opt.optlen >> 2; ip_options_build(skb, &inet_opt->opt, inet->inet_daddr, rt, 0); |
1da177e4c Linux-2.6.12-rc2 |
417 |
} |
73f156a6e inetpeer: get rid... |
418 |
ip_select_ident_segs(skb, sk, skb_shinfo(skb)->gso_segs ?: 1); |
1da177e4c Linux-2.6.12-rc2 |
419 |
|
b0270e910 ipv4: add a sock ... |
420 |
/* TODO : should we use skb->sk here instead of sk ? */ |
1da177e4c Linux-2.6.12-rc2 |
421 |
skb->priority = sk->sk_priority; |
4a19ec580 [NET]: Introducin... |
422 |
skb->mark = sk->sk_mark; |
1da177e4c Linux-2.6.12-rc2 |
423 |
|
ab6e3feba net: No dst refco... |
424 425 426 |
res = ip_local_out(skb); rcu_read_unlock(); return res; |
1da177e4c Linux-2.6.12-rc2 |
427 428 |
no_route: |
ab6e3feba net: No dst refco... |
429 |
rcu_read_unlock(); |
5e38e2704 mib: add net to I... |
430 |
IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
1da177e4c Linux-2.6.12-rc2 |
431 432 433 |
kfree_skb(skb); return -EHOSTUNREACH; } |
4bc2f18ba net/ipv4: EXPORT_... |
434 |
EXPORT_SYMBOL(ip_queue_xmit); |
1da177e4c Linux-2.6.12-rc2 |
435 436 437 438 439 440 441 |
static void ip_copy_metadata(struct sk_buff *to, struct sk_buff *from) { to->pkt_type = from->pkt_type; to->priority = from->priority; to->protocol = from->protocol; |
adf30907d net: skb->dst acc... |
442 |
skb_dst_drop(to); |
fe76cda30 ipv4: use skb_dst... |
443 |
skb_dst_copy(to, from); |
1da177e4c Linux-2.6.12-rc2 |
444 |
to->dev = from->dev; |
82e91ffef [NET]: Turn nfmar... |
445 |
to->mark = from->mark; |
1da177e4c Linux-2.6.12-rc2 |
446 447 448 449 450 451 452 |
/* Copy the flags to each fragment. */ IPCB(to)->flags = IPCB(from)->flags; #ifdef CONFIG_NET_SCHED to->tc_index = from->tc_index; #endif |
e7ac05f34 [NETFILTER]: nf_c... |
453 |
nf_copy(to, from); |
c98d80edc [SK_BUFF]: ipvs_p... |
454 455 456 |
#if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE) to->ipvs_property = from->ipvs_property; #endif |
984bc16cc [SECMARK]: Add se... |
457 |
skb_copy_secmark(to, from); |
1da177e4c Linux-2.6.12-rc2 |
458 459 460 461 462 463 464 465 |
} /* * This IP datagram is too large to be sent in one piece. Break it up into * smaller pieces (each of size equal to IP header plus * a block of the data of the original IP data part) that will yet fit in a * single device frame, and queue such a frame for sending. */ |
d9319100c net: clean up net... |
466 |
int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) |
1da177e4c Linux-2.6.12-rc2 |
467 468 |
{ struct iphdr *iph; |
1da177e4c Linux-2.6.12-rc2 |
469 470 471 |
int ptr; struct net_device *dev; struct sk_buff *skb2; |
c893b8066 ip_fragment: fix ... |
472 |
unsigned int mtu, hlen, left, len, ll_rs; |
1da177e4c Linux-2.6.12-rc2 |
473 |
int offset; |
76ab608d8 [NET]: Endian-ann... |
474 |
__be16 not_last_frag; |
511c3f92a net: skb->rtable ... |
475 |
struct rtable *rt = skb_rtable(skb); |
1da177e4c Linux-2.6.12-rc2 |
476 |
int err = 0; |
d8d1f30b9 net-next: remove ... |
477 |
dev = rt->dst.dev; |
1da177e4c Linux-2.6.12-rc2 |
478 479 480 481 |
/* * Point into the IP datagram header. */ |
eddc9ec53 [SK_BUFF]: Introd... |
482 |
iph = ip_hdr(skb); |
1da177e4c Linux-2.6.12-rc2 |
483 |
|
69647ce46 ipv4: use ip_skb_... |
484 |
mtu = ip_skb_dst_mtu(skb); |
60ff74673 net: rename local... |
485 |
if (unlikely(((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) || |
5f2d04f1f ipv4: fix path MT... |
486 |
(IPCB(skb)->frag_max_size && |
f87c10a8a ipv4: introduce i... |
487 |
IPCB(skb)->frag_max_size > mtu))) { |
5e38e2704 mib: add net to I... |
488 |
IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4c Linux-2.6.12-rc2 |
489 |
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
f87c10a8a ipv4: introduce i... |
490 |
htonl(mtu)); |
1da177e4c Linux-2.6.12-rc2 |
491 492 493 494 495 496 497 498 499 |
kfree_skb(skb); return -EMSGSIZE; } /* * Setup starting values. */ hlen = iph->ihl * 4; |
f87c10a8a ipv4: introduce i... |
500 |
mtu = mtu - hlen; /* Size of data space */ |
1109a90c0 netfilter: use IS... |
501 |
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
6c79bf0f2 netfilter: bridge... |
502 503 504 |
if (skb->nf_bridge) mtu -= nf_bridge_mtu_reduction(skb); #endif |
89cee8b1c [IPV4]: Safer rea... |
505 |
IPCB(skb)->flags |= IPSKB_FRAG_COMPLETE; |
1da177e4c Linux-2.6.12-rc2 |
506 507 508 509 510 511 512 513 |
/* When frag_list is given, use it. First, check its validity: * some transformers could create wrong frag_list or break existing * one, it is not prohibited. In this case fall back to copying. * * LATER: this step can be merged to real generation of fragments, * we can switch to copy when see the first bad fragment. */ |
21dc33015 net: Rename skb_h... |
514 |
if (skb_has_frag_list(skb)) { |
3d13008e7 ip: fix truesize ... |
515 |
struct sk_buff *frag, *frag2; |
1da177e4c Linux-2.6.12-rc2 |
516 517 518 519 |
int first_len = skb_pagelen(skb); if (first_len - hlen > mtu || ((first_len - hlen) & 7) || |
56f8a75c1 ip: introduce ip_... |
520 |
ip_is_fragment(iph) || |
1da177e4c Linux-2.6.12-rc2 |
521 522 |
skb_cloned(skb)) goto slow_path; |
d7fcf1a5c ipv4: Use frag li... |
523 |
skb_walk_frags(skb, frag) { |
1da177e4c Linux-2.6.12-rc2 |
524 525 526 527 |
/* Correct geometry. */ if (frag->len > mtu || ((frag->len & 7) && frag->next) || skb_headroom(frag) < hlen) |
3d13008e7 ip: fix truesize ... |
528 |
goto slow_path_clean; |
1da177e4c Linux-2.6.12-rc2 |
529 530 531 |
/* Partially cloned skb? */ if (skb_shared(frag)) |
3d13008e7 ip: fix truesize ... |
532 |
goto slow_path_clean; |
2fdba6b08 [IPV4/IPV6] Ensur... |
533 534 535 |
BUG_ON(frag->sk); if (skb->sk) { |
2fdba6b08 [IPV4/IPV6] Ensur... |
536 537 |
frag->sk = skb->sk; frag->destructor = sock_wfree; |
2fdba6b08 [IPV4/IPV6] Ensur... |
538 |
} |
3d13008e7 ip: fix truesize ... |
539 |
skb->truesize -= frag->truesize; |
1da177e4c Linux-2.6.12-rc2 |
540 541 542 543 544 545 546 |
} /* Everything is OK. Generate! */ err = 0; offset = 0; frag = skb_shinfo(skb)->frag_list; |
d7fcf1a5c ipv4: Use frag li... |
547 |
skb_frag_list_init(skb); |
1da177e4c Linux-2.6.12-rc2 |
548 549 550 551 552 553 554 555 556 557 558 |
skb->data_len = first_len - skb_headlen(skb); skb->len = first_len; iph->tot_len = htons(first_len); iph->frag_off = htons(IP_MF); ip_send_check(iph); for (;;) { /* Prepare header of the next frame, * before previous one went down. */ if (frag) { frag->ip_summed = CHECKSUM_NONE; |
badff6d01 [SK_BUFF]: Introd... |
559 |
skb_reset_transport_header(frag); |
e2d1bca7e [SK_BUFF]: Use sk... |
560 561 |
__skb_push(frag, hlen); skb_reset_network_header(frag); |
d56f90a7c [SK_BUFF]: Introd... |
562 |
memcpy(skb_network_header(frag), iph, hlen); |
eddc9ec53 [SK_BUFF]: Introd... |
563 |
iph = ip_hdr(frag); |
1da177e4c Linux-2.6.12-rc2 |
564 565 566 567 568 569 570 571 572 573 574 575 576 |
iph->tot_len = htons(frag->len); ip_copy_metadata(frag, skb); if (offset == 0) ip_options_fragment(frag); offset += skb->len - hlen; iph->frag_off = htons(offset>>3); if (frag->next != NULL) iph->frag_off |= htons(IP_MF); /* Ready, complete checksum */ ip_send_check(iph); } err = output(skb); |
dafee4908 [IPV6]: SNMPv2 "i... |
577 |
if (!err) |
5e38e2704 mib: add net to I... |
578 |
IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGCREATES); |
1da177e4c Linux-2.6.12-rc2 |
579 580 581 582 583 584 585 586 587 |
if (err || !frag) break; skb = frag; frag = skb->next; skb->next = NULL; } if (err == 0) { |
5e38e2704 mib: add net to I... |
588 |
IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGOKS); |
1da177e4c Linux-2.6.12-rc2 |
589 590 591 592 593 594 595 596 |
return 0; } while (frag) { skb = frag->next; kfree_skb(frag); frag = skb; } |
5e38e2704 mib: add net to I... |
597 |
IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4c Linux-2.6.12-rc2 |
598 |
return err; |
3d13008e7 ip: fix truesize ... |
599 600 601 602 603 604 605 606 607 |
slow_path_clean: skb_walk_frags(skb, frag2) { if (frag2 == frag) break; frag2->sk = NULL; frag2->destructor = NULL; skb->truesize += frag2->truesize; } |
1da177e4c Linux-2.6.12-rc2 |
608 609 610 |
} slow_path: |
fc70fb640 net: Handle encap... |
611 612 613 |
/* for offloaded checksums cleanup checksum before fragmentation */ if ((skb->ip_summed == CHECKSUM_PARTIAL) && skb_checksum_help(skb)) goto fail; |
c9af6db4c net: Fix possible... |
614 |
iph = ip_hdr(skb); |
fc70fb640 net: Handle encap... |
615 |
|
1da177e4c Linux-2.6.12-rc2 |
616 |
left = skb->len - hlen; /* Space per frame */ |
49085bd7d net/ipv4/ip_outpu... |
617 |
ptr = hlen; /* Where to start from */ |
1da177e4c Linux-2.6.12-rc2 |
618 |
|
1da177e4c Linux-2.6.12-rc2 |
619 |
/* for bridged IP traffic encapsulated inside f.e. a vlan header, |
9bcfcaf5e [NETFILTER] bridg... |
620 621 |
* we need to make room for the encapsulating header */ |
c893b8066 ip_fragment: fix ... |
622 |
ll_rs = LL_RESERVED_SPACE_EXTRA(rt->dst.dev, nf_bridge_pad(skb)); |
9bcfcaf5e [NETFILTER] bridg... |
623 |
|
1da177e4c Linux-2.6.12-rc2 |
624 625 626 627 628 629 630 631 632 633 |
/* * Fragment the datagram. */ offset = (ntohs(iph->frag_off) & IP_OFFSET) << 3; not_last_frag = iph->frag_off & htons(IP_MF); /* * Keep copying data until we run out. */ |
132adf546 [IPV4]: cleanup |
634 |
while (left > 0) { |
1da177e4c Linux-2.6.12-rc2 |
635 636 637 638 |
len = left; /* IF: it doesn't fit, use 'mtu' - the data space left */ if (len > mtu) len = mtu; |
25985edce Fix common misspe... |
639 |
/* IF: we are not sending up to and including the packet end |
1da177e4c Linux-2.6.12-rc2 |
640 641 642 643 |
then align the next start on an eight byte boundary */ if (len < left) { len &= ~7; } |
1da177e4c Linux-2.6.12-rc2 |
644 |
|
cbffccc97 net; ipv[46] - Re... |
645 646 647 |
/* Allocate buffer */ skb2 = alloc_skb(len + hlen + ll_rs, GFP_ATOMIC); if (!skb2) { |
1da177e4c Linux-2.6.12-rc2 |
648 649 650 651 652 653 654 655 656 657 658 |
err = -ENOMEM; goto fail; } /* * Set up data on packet */ ip_copy_metadata(skb2, skb); skb_reserve(skb2, ll_rs); skb_put(skb2, len + hlen); |
c1d2bbe1c [SK_BUFF]: Introd... |
659 |
skb_reset_network_header(skb2); |
b0e380b1d [SK_BUFF]: unions... |
660 |
skb2->transport_header = skb2->network_header + hlen; |
1da177e4c Linux-2.6.12-rc2 |
661 662 663 664 665 666 667 668 669 670 671 672 |
/* * Charge the memory for the fragment to any owner * it might possess */ if (skb->sk) skb_set_owner_w(skb2, skb->sk); /* * Copy the packet header into the new buffer. */ |
d626f62b1 [SK_BUFF]: Introd... |
673 |
skb_copy_from_linear_data(skb, skb_network_header(skb2), hlen); |
1da177e4c Linux-2.6.12-rc2 |
674 675 676 677 |
/* * Copy a block of the IP datagram. */ |
bff9b61ce [SK_BUFF]: Use th... |
678 |
if (skb_copy_bits(skb, ptr, skb_transport_header(skb2), len)) |
1da177e4c Linux-2.6.12-rc2 |
679 680 681 682 683 684 |
BUG(); left -= len; /* * Fill in the new header fields. */ |
eddc9ec53 [SK_BUFF]: Introd... |
685 |
iph = ip_hdr(skb2); |
1da177e4c Linux-2.6.12-rc2 |
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 |
iph->frag_off = htons((offset >> 3)); /* ANK: dirty, but effective trick. Upgrade options only if * the segment to be fragmented was THE FIRST (otherwise, * options are already fixed) and make it ONCE * on the initial skb, so that all the following fragments * will inherit fixed options. */ if (offset == 0) ip_options_fragment(skb); /* * Added AC : If we are fragmenting a fragment that's not the * last fragment then keep MF on each bit */ if (left > 0 || not_last_frag) iph->frag_off |= htons(IP_MF); ptr += len; offset += len; /* * Put this fragment into the sending queue. */ |
1da177e4c Linux-2.6.12-rc2 |
709 710 711 712 713 714 715 |
iph->tot_len = htons(len + hlen); ip_send_check(iph); err = output(skb2); if (err) goto fail; |
dafee4908 [IPV6]: SNMPv2 "i... |
716 |
|
5e38e2704 mib: add net to I... |
717 |
IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGCREATES); |
1da177e4c Linux-2.6.12-rc2 |
718 |
} |
5d0ba55b6 net: use consume_... |
719 |
consume_skb(skb); |
5e38e2704 mib: add net to I... |
720 |
IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGOKS); |
1da177e4c Linux-2.6.12-rc2 |
721 722 723 |
return err; fail: |
e905a9eda [NET] IPV4: Fix w... |
724 |
kfree_skb(skb); |
5e38e2704 mib: add net to I... |
725 |
IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4c Linux-2.6.12-rc2 |
726 727 |
return err; } |
2e2f7aefa [NETFILTER]: Fix ... |
728 |
EXPORT_SYMBOL(ip_fragment); |
1da177e4c Linux-2.6.12-rc2 |
729 730 731 |
int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) { |
f69e6d131 ip_generic_getfra... |
732 |
struct msghdr *msg = from; |
1da177e4c Linux-2.6.12-rc2 |
733 |
|
84fa7933a [NET]: Replace CH... |
734 |
if (skb->ip_summed == CHECKSUM_PARTIAL) { |
c0371da60 put iov_iter into... |
735 736 |
/* XXX: stripping const */ if (memcpy_fromiovecend(to, (struct iovec *)msg->msg_iter.iov, offset, len) < 0) |
1da177e4c Linux-2.6.12-rc2 |
737 738 |
return -EFAULT; } else { |
44bb93633 [NET]: Annotate c... |
739 |
__wsum csum = 0; |
c0371da60 put iov_iter into... |
740 741 |
/* XXX: stripping const */ if (csum_partial_copy_fromiovecend(to, (struct iovec *)msg->msg_iter.iov, offset, len, &csum) < 0) |
1da177e4c Linux-2.6.12-rc2 |
742 743 744 745 746 |
return -EFAULT; skb->csum = csum_block_add(skb->csum, csum, odd); } return 0; } |
4bc2f18ba net/ipv4: EXPORT_... |
747 |
EXPORT_SYMBOL(ip_generic_getfrag); |
1da177e4c Linux-2.6.12-rc2 |
748 |
|
44bb93633 [NET]: Annotate c... |
749 |
static inline __wsum |
1da177e4c Linux-2.6.12-rc2 |
750 751 752 |
csum_page(struct page *page, int offset, int copy) { char *kaddr; |
44bb93633 [NET]: Annotate c... |
753 |
__wsum csum; |
1da177e4c Linux-2.6.12-rc2 |
754 755 756 757 758 |
kaddr = kmap(page); csum = csum_partial(kaddr + offset, copy, 0); kunmap(page); return csum; } |
4b30b1c6a [IPV4]: make two ... |
759 |
static inline int ip_ufo_append_data(struct sock *sk, |
1470ddf7f inet: Remove expl... |
760 |
struct sk_buff_head *queue, |
e89e9cf53 [IPv4/IPv6]: UFO ... |
761 762 763 |
int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int length, int hh_len, int fragheaderlen, |
d9be4f7a6 ipv4: Constrain U... |
764 |
int transhdrlen, int maxfraglen, unsigned int flags) |
e89e9cf53 [IPv4/IPv6]: UFO ... |
765 766 767 768 769 770 771 772 |
{ struct sk_buff *skb; int err; /* There is support for UDP fragmentation offload by network * device, so create one single skb packet containing complete * udp datagram */ |
1470ddf7f inet: Remove expl... |
773 |
if ((skb = skb_peek_tail(queue)) == NULL) { |
e89e9cf53 [IPv4/IPv6]: UFO ... |
774 775 776 777 778 779 780 781 782 783 784 |
skb = sock_alloc_send_skb(sk, hh_len + fragheaderlen + transhdrlen + 20, (flags & MSG_DONTWAIT), &err); if (skb == NULL) return err; /* reserve space for Hardware header */ skb_reserve(skb, hh_len); /* create space for UDP/IP header */ |
d9319100c net: clean up net... |
785 |
skb_put(skb, fragheaderlen + transhdrlen); |
e89e9cf53 [IPv4/IPv6]: UFO ... |
786 787 |
/* initialize network header pointer */ |
c1d2bbe1c [SK_BUFF]: Introd... |
788 |
skb_reset_network_header(skb); |
e89e9cf53 [IPv4/IPv6]: UFO ... |
789 790 |
/* initialize protocol header pointer */ |
b0e380b1d [SK_BUFF]: unions... |
791 |
skb->transport_header = skb->network_header + fragheaderlen; |
e89e9cf53 [IPv4/IPv6]: UFO ... |
792 |
|
e89e9cf53 [IPv4/IPv6]: UFO ... |
793 |
skb->csum = 0; |
e89e9cf53 [IPv4/IPv6]: UFO ... |
794 |
|
e93b7d748 ip_output: do skb... |
795 |
|
1470ddf7f inet: Remove expl... |
796 |
__skb_queue_tail(queue, skb); |
e93b7d748 ip_output: do skb... |
797 798 |
} else if (skb_is_gso(skb)) { goto append; |
e89e9cf53 [IPv4/IPv6]: UFO ... |
799 |
} |
be9164e76 [IPv4] UFO: preve... |
800 |
|
e93b7d748 ip_output: do skb... |
801 802 803 804 805 806 |
skb->ip_summed = CHECKSUM_PARTIAL; /* specify the length of each IP datagram fragment */ skb_shinfo(skb)->gso_size = maxfraglen - fragheaderlen; skb_shinfo(skb)->gso_type = SKB_GSO_UDP; append: |
be9164e76 [IPv4] UFO: preve... |
807 808 |
return skb_append_datato_frags(sk, skb, getfrag, from, (length - transhdrlen)); |
e89e9cf53 [IPv4/IPv6]: UFO ... |
809 |
} |
f5fca6086 ipv4: Pass flow k... |
810 811 812 |
static int __ip_append_data(struct sock *sk, struct flowi4 *fl4, struct sk_buff_head *queue, |
1470ddf7f inet: Remove expl... |
813 |
struct inet_cork *cork, |
5640f7685 net: use a per ta... |
814 |
struct page_frag *pfrag, |
1470ddf7f inet: Remove expl... |
815 816 817 818 |
int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int length, int transhdrlen, unsigned int flags) |
1da177e4c Linux-2.6.12-rc2 |
819 820 821 |
{ struct inet_sock *inet = inet_sk(sk); struct sk_buff *skb; |
07df5294a inet: Replace lef... |
822 |
struct ip_options *opt = cork->opt; |
1da177e4c Linux-2.6.12-rc2 |
823 824 825 826 827 828 |
int hh_len; int exthdrlen; int mtu; int copy; int err; int offset = 0; |
daba287b2 ipv4: fix DO and ... |
829 |
unsigned int maxfraglen, fragheaderlen, maxnonfragsize; |
1da177e4c Linux-2.6.12-rc2 |
830 |
int csummode = CHECKSUM_NONE; |
1470ddf7f inet: Remove expl... |
831 |
struct rtable *rt = (struct rtable *)cork->dst; |
09c2d251b net-timestamp: ad... |
832 |
u32 tskey = 0; |
1da177e4c Linux-2.6.12-rc2 |
833 |
|
96d7303e9 ipv4: Fix packet ... |
834 835 836 |
skb = skb_peek_tail(queue); exthdrlen = !skb ? rt->dst.header_len : 0; |
07df5294a inet: Replace lef... |
837 |
mtu = cork->fragsize; |
09c2d251b net-timestamp: ad... |
838 839 840 |
if (cork->tx_flags & SKBTX_ANY_SW_TSTAMP && sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) tskey = sk->sk_tskey++; |
1da177e4c Linux-2.6.12-rc2 |
841 |
|
d8d1f30b9 net-next: remove ... |
842 |
hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
1da177e4c Linux-2.6.12-rc2 |
843 844 845 |
fragheaderlen = sizeof(struct iphdr) + (opt ? opt->optlen : 0); maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen; |
60ff74673 net: rename local... |
846 |
maxnonfragsize = ip_sk_ignore_df(sk) ? 0xFFFF : mtu; |
1da177e4c Linux-2.6.12-rc2 |
847 |
|
daba287b2 ipv4: fix DO and ... |
848 |
if (cork->length + length > maxnonfragsize - fragheaderlen) { |
f5fca6086 ipv4: Pass flow k... |
849 |
ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, |
61e7f09d0 ipv4: consistent ... |
850 |
mtu - (opt ? opt->optlen : 0)); |
1da177e4c Linux-2.6.12-rc2 |
851 852 853 854 855 856 857 858 859 |
return -EMSGSIZE; } /* * transhdrlen > 0 means that this is the first fragment and we wish * it won't be fragmented in the future. */ if (transhdrlen && length + fragheaderlen <= mtu && |
d8d1f30b9 net-next: remove ... |
860 |
rt->dst.dev->features & NETIF_F_V4_CSUM && |
1da177e4c Linux-2.6.12-rc2 |
861 |
!exthdrlen) |
84fa7933a [NET]: Replace CH... |
862 |
csummode = CHECKSUM_PARTIAL; |
1da177e4c Linux-2.6.12-rc2 |
863 |
|
1470ddf7f inet: Remove expl... |
864 |
cork->length += length; |
26cde9f7e udp: Fix bogus UF... |
865 |
if (((length > mtu) || (skb && skb_is_gso(skb))) && |
be9164e76 [IPv4] UFO: preve... |
866 |
(sk->sk_protocol == IPPROTO_UDP) && |
c146066ab ipv4: Don't use u... |
867 |
(rt->dst.dev->features & NETIF_F_UFO) && !rt->dst.header_len) { |
1470ddf7f inet: Remove expl... |
868 869 |
err = ip_ufo_append_data(sk, queue, getfrag, from, length, hh_len, fragheaderlen, transhdrlen, |
d9be4f7a6 ipv4: Constrain U... |
870 |
maxfraglen, flags); |
baa829d89 [IPV4/6]: Fix UFO... |
871 |
if (err) |
e89e9cf53 [IPv4/IPv6]: UFO ... |
872 |
goto error; |
e89e9cf53 [IPv4/IPv6]: UFO ... |
873 874 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
875 876 877 878 879 880 881 |
/* So, what's going on in the loop below? * * We use calculated fragment length to generate chained skb, * each of segments is IP fragment ready for sending to network after * adding appropriate IP header. */ |
26cde9f7e udp: Fix bogus UF... |
882 |
if (!skb) |
1da177e4c Linux-2.6.12-rc2 |
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 |
goto alloc_new_skb; while (length > 0) { /* Check if the remaining data fits into current packet. */ copy = mtu - skb->len; if (copy < length) copy = maxfraglen - skb->len; if (copy <= 0) { char *data; unsigned int datalen; unsigned int fraglen; unsigned int fraggap; unsigned int alloclen; struct sk_buff *skb_prev; alloc_new_skb: skb_prev = skb; if (skb_prev) fraggap = skb_prev->len - maxfraglen; else fraggap = 0; /* * If remaining data exceeds the mtu, * we know we need more fragment(s). */ datalen = length + fraggap; if (datalen > mtu - fragheaderlen) datalen = maxfraglen - fragheaderlen; fraglen = datalen + fragheaderlen; |
e905a9eda [NET] IPV4: Fix w... |
912 |
if ((flags & MSG_MORE) && |
d8d1f30b9 net-next: remove ... |
913 |
!(rt->dst.dev->features&NETIF_F_SG)) |
1da177e4c Linux-2.6.12-rc2 |
914 915 |
alloclen = mtu; else |
59104f062 ip: take care of ... |
916 |
alloclen = fraglen; |
1da177e4c Linux-2.6.12-rc2 |
917 |
|
353e5c9ab ipv4: Fix IPsec s... |
918 |
alloclen += exthdrlen; |
1da177e4c Linux-2.6.12-rc2 |
919 920 921 922 923 |
/* The last fragment gets additional space at tail. * Note, with MSG_MORE we overallocate on fragments, * because we have no idea what fragment will be * the last. */ |
33f99dc7f ipv4: Fix packet ... |
924 |
if (datalen == length + fraggap) |
d8d1f30b9 net-next: remove ... |
925 |
alloclen += rt->dst.trailer_len; |
33f99dc7f ipv4: Fix packet ... |
926 |
|
1da177e4c Linux-2.6.12-rc2 |
927 |
if (transhdrlen) { |
e905a9eda [NET] IPV4: Fix w... |
928 |
skb = sock_alloc_send_skb(sk, |
1da177e4c Linux-2.6.12-rc2 |
929 930 931 932 933 934 |
alloclen + hh_len + 15, (flags & MSG_DONTWAIT), &err); } else { skb = NULL; if (atomic_read(&sk->sk_wmem_alloc) <= 2 * sk->sk_sndbuf) |
e905a9eda [NET] IPV4: Fix w... |
935 |
skb = sock_wmalloc(sk, |
1da177e4c Linux-2.6.12-rc2 |
936 937 938 939 940 941 942 943 944 945 946 947 948 949 |
alloclen + hh_len + 15, 1, sk->sk_allocation); if (unlikely(skb == NULL)) err = -ENOBUFS; } if (skb == NULL) goto error; /* * Fill in the control structures */ skb->ip_summed = csummode; skb->csum = 0; skb_reserve(skb, hh_len); |
11878b40e net-timestamp: SO... |
950 951 |
/* only the initial fragment is time stamped */ |
1470ddf7f inet: Remove expl... |
952 |
skb_shinfo(skb)->tx_flags = cork->tx_flags; |
11878b40e net-timestamp: SO... |
953 |
cork->tx_flags = 0; |
09c2d251b net-timestamp: ad... |
954 955 |
skb_shinfo(skb)->tskey = tskey; tskey = 0; |
1da177e4c Linux-2.6.12-rc2 |
956 957 958 959 |
/* * Find where to start putting bytes. */ |
353e5c9ab ipv4: Fix IPsec s... |
960 |
data = skb_put(skb, fraglen + exthdrlen); |
c14d2450c [SK_BUFF]: Introd... |
961 |
skb_set_network_header(skb, exthdrlen); |
b0e380b1d [SK_BUFF]: unions... |
962 963 |
skb->transport_header = (skb->network_header + fragheaderlen); |
353e5c9ab ipv4: Fix IPsec s... |
964 |
data += fragheaderlen + exthdrlen; |
1da177e4c Linux-2.6.12-rc2 |
965 966 967 968 969 970 971 972 |
if (fraggap) { skb->csum = skb_copy_and_csum_bits( skb_prev, maxfraglen, data + transhdrlen, fraggap, 0); skb_prev->csum = csum_sub(skb_prev->csum, skb->csum); data += fraggap; |
e9fa4f7bd [INET]: Use pskb_... |
973 |
pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4c Linux-2.6.12-rc2 |
974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 |
} copy = datalen - transhdrlen - fraggap; if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { err = -EFAULT; kfree_skb(skb); goto error; } offset += copy; length -= datalen - fraggap; transhdrlen = 0; exthdrlen = 0; csummode = CHECKSUM_NONE; /* * Put the packet on the pending queue. */ |
1470ddf7f inet: Remove expl... |
992 |
__skb_queue_tail(queue, skb); |
1da177e4c Linux-2.6.12-rc2 |
993 994 995 996 997 |
continue; } if (copy > length) copy = length; |
d8d1f30b9 net-next: remove ... |
998 |
if (!(rt->dst.dev->features&NETIF_F_SG)) { |
1da177e4c Linux-2.6.12-rc2 |
999 1000 1001 |
unsigned int off; off = skb->len; |
e905a9eda [NET] IPV4: Fix w... |
1002 |
if (getfrag(from, skb_put(skb, copy), |
1da177e4c Linux-2.6.12-rc2 |
1003 1004 1005 1006 1007 1008 1009 |
offset, copy, off, skb) < 0) { __skb_trim(skb, off); err = -EFAULT; goto error; } } else { int i = skb_shinfo(skb)->nr_frags; |
1da177e4c Linux-2.6.12-rc2 |
1010 |
|
5640f7685 net: use a per ta... |
1011 1012 |
err = -ENOMEM; if (!sk_page_frag_refill(sk, pfrag)) |
1da177e4c Linux-2.6.12-rc2 |
1013 |
goto error; |
5640f7685 net: use a per ta... |
1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 |
if (!skb_can_coalesce(skb, i, pfrag->page, pfrag->offset)) { err = -EMSGSIZE; if (i == MAX_SKB_FRAGS) goto error; __skb_fill_page_desc(skb, i, pfrag->page, pfrag->offset, 0); skb_shinfo(skb)->nr_frags = ++i; get_page(pfrag->page); |
1da177e4c Linux-2.6.12-rc2 |
1025 |
} |
5640f7685 net: use a per ta... |
1026 1027 1028 1029 1030 1031 1032 1033 |
copy = min_t(int, copy, pfrag->size - pfrag->offset); if (getfrag(from, page_address(pfrag->page) + pfrag->offset, offset, copy, skb->len, skb) < 0) goto error_efault; pfrag->offset += copy; skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); |
1da177e4c Linux-2.6.12-rc2 |
1034 1035 |
skb->len += copy; skb->data_len += copy; |
f945fa7ad [INET]: Fix trues... |
1036 1037 |
skb->truesize += copy; atomic_add(copy, &sk->sk_wmem_alloc); |
1da177e4c Linux-2.6.12-rc2 |
1038 1039 1040 1041 1042 1043 |
} offset += copy; length -= copy; } return 0; |
5640f7685 net: use a per ta... |
1044 1045 |
error_efault: err = -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
1046 |
error: |
1470ddf7f inet: Remove expl... |
1047 |
cork->length -= length; |
5e38e2704 mib: add net to I... |
1048 |
IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTDISCARDS); |
e905a9eda [NET] IPV4: Fix w... |
1049 |
return err; |
1da177e4c Linux-2.6.12-rc2 |
1050 |
} |
1470ddf7f inet: Remove expl... |
1051 1052 1053 |
static int ip_setup_cork(struct sock *sk, struct inet_cork *cork, struct ipcm_cookie *ipc, struct rtable **rtp) { |
f6d8bd051 inet: add RCU pro... |
1054 |
struct ip_options_rcu *opt; |
1470ddf7f inet: Remove expl... |
1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 |
struct rtable *rt; /* * setup for corking. */ opt = ipc->opt; if (opt) { if (cork->opt == NULL) { cork->opt = kmalloc(sizeof(struct ip_options) + 40, sk->sk_allocation); if (unlikely(cork->opt == NULL)) return -ENOBUFS; } |
f6d8bd051 inet: add RCU pro... |
1068 |
memcpy(cork->opt, &opt->opt, sizeof(struct ip_options) + opt->opt.optlen); |
1470ddf7f inet: Remove expl... |
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 |
cork->flags |= IPCORK_OPT; cork->addr = ipc->addr; } rt = *rtp; if (unlikely(!rt)) return -EFAULT; /* * We steal reference to this route, caller should not release it */ *rtp = NULL; |
482fc6094 ipv4: introduce n... |
1079 1080 |
cork->fragsize = ip_sk_use_pmtu(sk) ? dst_mtu(&rt->dst) : rt->dst.dev->mtu; |
1470ddf7f inet: Remove expl... |
1081 1082 |
cork->dst = &rt->dst; cork->length = 0; |
aa6615814 ipv4: processing ... |
1083 1084 1085 |
cork->ttl = ipc->ttl; cork->tos = ipc->tos; cork->priority = ipc->priority; |
1470ddf7f inet: Remove expl... |
1086 |
cork->tx_flags = ipc->tx_flags; |
1470ddf7f inet: Remove expl... |
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 |
return 0; } /* * ip_append_data() and ip_append_page() can make one large IP datagram * from many pieces of data. Each pieces will be holded on the socket * until ip_push_pending_frames() is called. Each piece can be a page * or non-page data. * * Not only UDP, other transport protocols - e.g. raw sockets - can use * this interface potentially. * * LATER: length must be adjusted by pad at tail, when it is required. */ |
f5fca6086 ipv4: Pass flow k... |
1102 |
int ip_append_data(struct sock *sk, struct flowi4 *fl4, |
1470ddf7f inet: Remove expl... |
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 |
int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int length, int transhdrlen, struct ipcm_cookie *ipc, struct rtable **rtp, unsigned int flags) { struct inet_sock *inet = inet_sk(sk); int err; if (flags&MSG_PROBE) return 0; if (skb_queue_empty(&sk->sk_write_queue)) { |
bdc712b4c inet: Decrease ov... |
1116 |
err = ip_setup_cork(sk, &inet->cork.base, ipc, rtp); |
1470ddf7f inet: Remove expl... |
1117 1118 1119 1120 1121 |
if (err) return err; } else { transhdrlen = 0; } |
5640f7685 net: use a per ta... |
1122 1123 |
return __ip_append_data(sk, fl4, &sk->sk_write_queue, &inet->cork.base, sk_page_frag(sk), getfrag, |
1470ddf7f inet: Remove expl... |
1124 1125 |
from, length, transhdrlen, flags); } |
f5fca6086 ipv4: Pass flow k... |
1126 |
ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, |
1da177e4c Linux-2.6.12-rc2 |
1127 1128 1129 1130 1131 1132 |
int offset, size_t size, int flags) { struct inet_sock *inet = inet_sk(sk); struct sk_buff *skb; struct rtable *rt; struct ip_options *opt = NULL; |
bdc712b4c inet: Decrease ov... |
1133 |
struct inet_cork *cork; |
1da177e4c Linux-2.6.12-rc2 |
1134 1135 1136 1137 |
int hh_len; int mtu; int len; int err; |
daba287b2 ipv4: fix DO and ... |
1138 |
unsigned int maxfraglen, fragheaderlen, fraggap, maxnonfragsize; |
1da177e4c Linux-2.6.12-rc2 |
1139 1140 1141 1142 1143 1144 1145 1146 1147 |
if (inet->hdrincl) return -EPERM; if (flags&MSG_PROBE) return 0; if (skb_queue_empty(&sk->sk_write_queue)) return -EINVAL; |
bdc712b4c inet: Decrease ov... |
1148 1149 1150 1151 |
cork = &inet->cork.base; rt = (struct rtable *)cork->dst; if (cork->flags & IPCORK_OPT) opt = cork->opt; |
1da177e4c Linux-2.6.12-rc2 |
1152 |
|
d8d1f30b9 net-next: remove ... |
1153 |
if (!(rt->dst.dev->features&NETIF_F_SG)) |
1da177e4c Linux-2.6.12-rc2 |
1154 |
return -EOPNOTSUPP; |
d8d1f30b9 net-next: remove ... |
1155 |
hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
bdc712b4c inet: Decrease ov... |
1156 |
mtu = cork->fragsize; |
1da177e4c Linux-2.6.12-rc2 |
1157 1158 1159 |
fragheaderlen = sizeof(struct iphdr) + (opt ? opt->optlen : 0); maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen; |
60ff74673 net: rename local... |
1160 |
maxnonfragsize = ip_sk_ignore_df(sk) ? 0xFFFF : mtu; |
1da177e4c Linux-2.6.12-rc2 |
1161 |
|
daba287b2 ipv4: fix DO and ... |
1162 |
if (cork->length + size > maxnonfragsize - fragheaderlen) { |
61e7f09d0 ipv4: consistent ... |
1163 1164 |
ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, mtu - (opt ? opt->optlen : 0)); |
1da177e4c Linux-2.6.12-rc2 |
1165 1166 1167 1168 1169 |
return -EMSGSIZE; } if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) return -EINVAL; |
bdc712b4c inet: Decrease ov... |
1170 |
cork->length += size; |
26cde9f7e udp: Fix bogus UF... |
1171 1172 |
if ((size + skb->len > mtu) && (sk->sk_protocol == IPPROTO_UDP) && |
d8d1f30b9 net-next: remove ... |
1173 |
(rt->dst.dev->features & NETIF_F_UFO)) { |
7967168ce [NET]: Merge TSO/... |
1174 |
skb_shinfo(skb)->gso_size = mtu - fragheaderlen; |
f83ef8c0b [IPV6]: Added GSO... |
1175 |
skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
7967168ce [NET]: Merge TSO/... |
1176 |
} |
e89e9cf53 [IPv4/IPv6]: UFO ... |
1177 |
|
1da177e4c Linux-2.6.12-rc2 |
1178 1179 1180 |
while (size > 0) { int i; |
89114afd4 [NET] gso: Add sk... |
1181 |
if (skb_is_gso(skb)) |
e89e9cf53 [IPv4/IPv6]: UFO ... |
1182 1183 1184 1185 1186 1187 1188 1189 |
len = size; else { /* Check if the remaining data fits into current packet. */ len = mtu - skb->len; if (len < size) len = maxfraglen - skb->len; } |
1da177e4c Linux-2.6.12-rc2 |
1190 1191 |
if (len <= 0) { struct sk_buff *skb_prev; |
1da177e4c Linux-2.6.12-rc2 |
1192 1193 1194 |
int alloclen; skb_prev = skb; |
0d0d2bba9 [IPV4]: Remove de... |
1195 |
fraggap = skb_prev->len - maxfraglen; |
1da177e4c Linux-2.6.12-rc2 |
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 |
alloclen = fragheaderlen + hh_len + fraggap + 15; skb = sock_wmalloc(sk, alloclen, 1, sk->sk_allocation); if (unlikely(!skb)) { err = -ENOBUFS; goto error; } /* * Fill in the control structures */ skb->ip_summed = CHECKSUM_NONE; skb->csum = 0; skb_reserve(skb, hh_len); /* * Find where to start putting bytes. */ |
967b05f64 [SK_BUFF]: Introd... |
1214 |
skb_put(skb, fragheaderlen + fraggap); |
2ca9e6f2c [SK_BUFF]: Some m... |
1215 |
skb_reset_network_header(skb); |
b0e380b1d [SK_BUFF]: unions... |
1216 1217 |
skb->transport_header = (skb->network_header + fragheaderlen); |
1da177e4c Linux-2.6.12-rc2 |
1218 |
if (fraggap) { |
967b05f64 [SK_BUFF]: Introd... |
1219 1220 |
skb->csum = skb_copy_and_csum_bits(skb_prev, maxfraglen, |
9c70220b7 [SK_BUFF]: Introd... |
1221 |
skb_transport_header(skb), |
967b05f64 [SK_BUFF]: Introd... |
1222 |
fraggap, 0); |
1da177e4c Linux-2.6.12-rc2 |
1223 1224 |
skb_prev->csum = csum_sub(skb_prev->csum, skb->csum); |
e9fa4f7bd [INET]: Use pskb_... |
1225 |
pskb_trim_unique(skb_prev, maxfraglen); |
1da177e4c Linux-2.6.12-rc2 |
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 |
} /* * Put the packet on the pending queue. */ __skb_queue_tail(&sk->sk_write_queue, skb); continue; } i = skb_shinfo(skb)->nr_frags; if (len > size) len = size; if (skb_can_coalesce(skb, i, page, offset)) { |
9e903e085 net: add skb frag... |
1239 |
skb_frag_size_add(&skb_shinfo(skb)->frags[i-1], len); |
1da177e4c Linux-2.6.12-rc2 |
1240 1241 1242 1243 1244 1245 1246 1247 1248 |
} else if (i < MAX_SKB_FRAGS) { get_page(page); skb_fill_page_desc(skb, i, page, offset, len); } else { err = -EMSGSIZE; goto error; } if (skb->ip_summed == CHECKSUM_NONE) { |
44bb93633 [NET]: Annotate c... |
1249 |
__wsum csum; |
1da177e4c Linux-2.6.12-rc2 |
1250 1251 1252 1253 1254 1255 |
csum = csum_page(page, offset, len); skb->csum = csum_block_add(skb->csum, csum, skb->len); } skb->len += len; skb->data_len += len; |
1e34a11d5 [IPV4]: Add missi... |
1256 1257 |
skb->truesize += len; atomic_add(len, &sk->sk_wmem_alloc); |
1da177e4c Linux-2.6.12-rc2 |
1258 1259 1260 1261 1262 1263 |
offset += len; size -= len; } return 0; error: |
bdc712b4c inet: Decrease ov... |
1264 |
cork->length -= size; |
5e38e2704 mib: add net to I... |
1265 |
IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTDISCARDS); |
1da177e4c Linux-2.6.12-rc2 |
1266 1267 |
return err; } |
1470ddf7f inet: Remove expl... |
1268 |
static void ip_cork_release(struct inet_cork *cork) |
429f08e95 [IPV4]: Consolida... |
1269 |
{ |
1470ddf7f inet: Remove expl... |
1270 1271 1272 1273 1274 |
cork->flags &= ~IPCORK_OPT; kfree(cork->opt); cork->opt = NULL; dst_release(cork->dst); cork->dst = NULL; |
429f08e95 [IPV4]: Consolida... |
1275 |
} |
1da177e4c Linux-2.6.12-rc2 |
1276 1277 1278 1279 |
/* * Combined all pending IP fragments on the socket as one IP datagram * and push them out. */ |
1c32c5ad6 inet: Add ip_make... |
1280 |
struct sk_buff *__ip_make_skb(struct sock *sk, |
77968b782 ipv4: Pass flow k... |
1281 |
struct flowi4 *fl4, |
1c32c5ad6 inet: Add ip_make... |
1282 1283 |
struct sk_buff_head *queue, struct inet_cork *cork) |
1da177e4c Linux-2.6.12-rc2 |
1284 1285 1286 1287 |
{ struct sk_buff *skb, *tmp_skb; struct sk_buff **tail_skb; struct inet_sock *inet = inet_sk(sk); |
0388b0042 icmp: add struct ... |
1288 |
struct net *net = sock_net(sk); |
1da177e4c Linux-2.6.12-rc2 |
1289 |
struct ip_options *opt = NULL; |
1470ddf7f inet: Remove expl... |
1290 |
struct rtable *rt = (struct rtable *)cork->dst; |
1da177e4c Linux-2.6.12-rc2 |
1291 |
struct iphdr *iph; |
76ab608d8 [NET]: Endian-ann... |
1292 |
__be16 df = 0; |
1da177e4c Linux-2.6.12-rc2 |
1293 |
__u8 ttl; |
1da177e4c Linux-2.6.12-rc2 |
1294 |
|
1470ddf7f inet: Remove expl... |
1295 |
if ((skb = __skb_dequeue(queue)) == NULL) |
1da177e4c Linux-2.6.12-rc2 |
1296 1297 1298 1299 |
goto out; tail_skb = &(skb_shinfo(skb)->frag_list); /* move skb->data to ip header from ext header */ |
d56f90a7c [SK_BUFF]: Introd... |
1300 |
if (skb->data < skb_network_header(skb)) |
bbe735e42 [SK_BUFF]: Introd... |
1301 |
__skb_pull(skb, skb_network_offset(skb)); |
1470ddf7f inet: Remove expl... |
1302 |
while ((tmp_skb = __skb_dequeue(queue)) != NULL) { |
cfe1fc775 [SK_BUFF]: Introd... |
1303 |
__skb_pull(tmp_skb, skb_network_header_len(skb)); |
1da177e4c Linux-2.6.12-rc2 |
1304 1305 1306 1307 1308 |
*tail_skb = tmp_skb; tail_skb = &(tmp_skb->next); skb->len += tmp_skb->len; skb->data_len += tmp_skb->len; skb->truesize += tmp_skb->truesize; |
1da177e4c Linux-2.6.12-rc2 |
1309 1310 1311 1312 1313 1314 1315 1316 |
tmp_skb->destructor = NULL; tmp_skb->sk = NULL; } /* Unless user demanded real pmtu discovery (IP_PMTUDISC_DO), we allow * to fragment the frame generated here. No matter, what transforms * how transforms change size of the packet, it will come out. */ |
60ff74673 net: rename local... |
1317 |
skb->ignore_df = ip_sk_ignore_df(sk); |
1da177e4c Linux-2.6.12-rc2 |
1318 1319 |
/* DF bit is set when we want to see DF on outgoing frames. |
60ff74673 net: rename local... |
1320 |
* If ignore_df is set too, we still allow to fragment this frame |
1da177e4c Linux-2.6.12-rc2 |
1321 |
* locally. */ |
482fc6094 ipv4: introduce n... |
1322 1323 |
if (inet->pmtudisc == IP_PMTUDISC_DO || inet->pmtudisc == IP_PMTUDISC_PROBE || |
d8d1f30b9 net-next: remove ... |
1324 1325 |
(skb->len <= dst_mtu(&rt->dst) && ip_dont_fragment(sk, &rt->dst))) |
1da177e4c Linux-2.6.12-rc2 |
1326 |
df = htons(IP_DF); |
1470ddf7f inet: Remove expl... |
1327 1328 |
if (cork->flags & IPCORK_OPT) opt = cork->opt; |
1da177e4c Linux-2.6.12-rc2 |
1329 |
|
aa6615814 ipv4: processing ... |
1330 1331 1332 |
if (cork->ttl != 0) ttl = cork->ttl; else if (rt->rt_type == RTN_MULTICAST) |
1da177e4c Linux-2.6.12-rc2 |
1333 1334 |
ttl = inet->mc_ttl; else |
d8d1f30b9 net-next: remove ... |
1335 |
ttl = ip_select_ttl(inet, &rt->dst); |
1da177e4c Linux-2.6.12-rc2 |
1336 |
|
749154aa5 ip: use ip_hdr() ... |
1337 |
iph = ip_hdr(skb); |
1da177e4c Linux-2.6.12-rc2 |
1338 1339 |
iph->version = 4; iph->ihl = 5; |
aa6615814 ipv4: processing ... |
1340 |
iph->tos = (cork->tos != -1) ? cork->tos : inet->tos; |
1da177e4c Linux-2.6.12-rc2 |
1341 |
iph->frag_off = df; |
1da177e4c Linux-2.6.12-rc2 |
1342 1343 |
iph->ttl = ttl; iph->protocol = sk->sk_protocol; |
84f9307c5 ipv4: use a 64bit... |
1344 |
ip_copy_addrs(iph, fl4); |
73f156a6e inetpeer: get rid... |
1345 |
ip_select_ident(skb, sk); |
1da177e4c Linux-2.6.12-rc2 |
1346 |
|
22f728f8f ipv4: Always call... |
1347 1348 1349 1350 |
if (opt) { iph->ihl += opt->optlen>>2; ip_options_build(skb, opt, cork->addr, rt, 0); } |
aa6615814 ipv4: processing ... |
1351 |
skb->priority = (cork->tos != -1) ? cork->priority: sk->sk_priority; |
4a19ec580 [NET]: Introducin... |
1352 |
skb->mark = sk->sk_mark; |
a21bba945 net: avoid a pair... |
1353 1354 1355 1356 |
/* * Steal rt from cork.dst to avoid a pair of atomic_inc/atomic_dec * on dst refcount */ |
1470ddf7f inet: Remove expl... |
1357 |
cork->dst = NULL; |
d8d1f30b9 net-next: remove ... |
1358 |
skb_dst_set(skb, &rt->dst); |
1da177e4c Linux-2.6.12-rc2 |
1359 |
|
96793b482 [IPV4]: Add ICMPM... |
1360 |
if (iph->protocol == IPPROTO_ICMP) |
0388b0042 icmp: add struct ... |
1361 |
icmp_out_count(net, ((struct icmphdr *) |
96793b482 [IPV4]: Add ICMPM... |
1362 |
skb_transport_header(skb))->type); |
1c32c5ad6 inet: Add ip_make... |
1363 1364 1365 1366 |
ip_cork_release(cork); out: return skb; } |
b5ec8eeac ipv4: fix ip_send... |
1367 |
int ip_send_skb(struct net *net, struct sk_buff *skb) |
1c32c5ad6 inet: Add ip_make... |
1368 |
{ |
1c32c5ad6 inet: Add ip_make... |
1369 |
int err; |
c439cb2e4 [IPV4]: Add ip_lo... |
1370 |
err = ip_local_out(skb); |
1da177e4c Linux-2.6.12-rc2 |
1371 1372 |
if (err) { if (err > 0) |
6ce9e7b5f ip: Report qdisc ... |
1373 |
err = net_xmit_errno(err); |
1da177e4c Linux-2.6.12-rc2 |
1374 |
if (err) |
1c32c5ad6 inet: Add ip_make... |
1375 |
IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); |
1da177e4c Linux-2.6.12-rc2 |
1376 |
} |
1da177e4c Linux-2.6.12-rc2 |
1377 |
return err; |
1da177e4c Linux-2.6.12-rc2 |
1378 |
} |
77968b782 ipv4: Pass flow k... |
1379 |
int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4) |
1470ddf7f inet: Remove expl... |
1380 |
{ |
1c32c5ad6 inet: Add ip_make... |
1381 |
struct sk_buff *skb; |
77968b782 ipv4: Pass flow k... |
1382 |
skb = ip_finish_skb(sk, fl4); |
1c32c5ad6 inet: Add ip_make... |
1383 1384 1385 1386 |
if (!skb) return 0; /* Netfilter gets whole the not fragmented skb. */ |
b5ec8eeac ipv4: fix ip_send... |
1387 |
return ip_send_skb(sock_net(sk), skb); |
1470ddf7f inet: Remove expl... |
1388 |
} |
1da177e4c Linux-2.6.12-rc2 |
1389 1390 1391 |
/* * Throw away all pending data on the socket. */ |
1470ddf7f inet: Remove expl... |
1392 1393 1394 |
static void __ip_flush_pending_frames(struct sock *sk, struct sk_buff_head *queue, struct inet_cork *cork) |
1da177e4c Linux-2.6.12-rc2 |
1395 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1396 |
struct sk_buff *skb; |
1470ddf7f inet: Remove expl... |
1397 |
while ((skb = __skb_dequeue_tail(queue)) != NULL) |
1da177e4c Linux-2.6.12-rc2 |
1398 |
kfree_skb(skb); |
1470ddf7f inet: Remove expl... |
1399 1400 1401 1402 1403 |
ip_cork_release(cork); } void ip_flush_pending_frames(struct sock *sk) { |
bdc712b4c inet: Decrease ov... |
1404 |
__ip_flush_pending_frames(sk, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
1da177e4c Linux-2.6.12-rc2 |
1405 |
} |
1c32c5ad6 inet: Add ip_make... |
1406 |
struct sk_buff *ip_make_skb(struct sock *sk, |
77968b782 ipv4: Pass flow k... |
1407 |
struct flowi4 *fl4, |
1c32c5ad6 inet: Add ip_make... |
1408 1409 1410 1411 1412 1413 |
int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int length, int transhdrlen, struct ipcm_cookie *ipc, struct rtable **rtp, unsigned int flags) { |
b80d72261 ipv4: Initialize ... |
1414 |
struct inet_cork cork; |
1c32c5ad6 inet: Add ip_make... |
1415 1416 1417 1418 1419 1420 1421 |
struct sk_buff_head queue; int err; if (flags & MSG_PROBE) return NULL; __skb_queue_head_init(&queue); |
b80d72261 ipv4: Initialize ... |
1422 1423 |
cork.flags = 0; cork.addr = 0; |
706527280 ipv4: Initialize ... |
1424 |
cork.opt = NULL; |
1c32c5ad6 inet: Add ip_make... |
1425 1426 1427 |
err = ip_setup_cork(sk, &cork, ipc, rtp); if (err) return ERR_PTR(err); |
5640f7685 net: use a per ta... |
1428 1429 |
err = __ip_append_data(sk, fl4, &queue, &cork, ¤t->task_frag, getfrag, |
1c32c5ad6 inet: Add ip_make... |
1430 1431 1432 1433 1434 |
from, length, transhdrlen, flags); if (err) { __ip_flush_pending_frames(sk, &queue, &cork); return ERR_PTR(err); } |
77968b782 ipv4: Pass flow k... |
1435 |
return __ip_make_skb(sk, fl4, &queue, &cork); |
1c32c5ad6 inet: Add ip_make... |
1436 |
} |
1da177e4c Linux-2.6.12-rc2 |
1437 1438 1439 1440 |
/* * Fetch data from kernel space and fill in checksum if needed. */ |
e905a9eda [NET] IPV4: Fix w... |
1441 |
static int ip_reply_glue_bits(void *dptr, char *to, int offset, |
1da177e4c Linux-2.6.12-rc2 |
1442 1443 |
int len, int odd, struct sk_buff *skb) { |
5084205fa [NET]: Annotate c... |
1444 |
__wsum csum; |
1da177e4c Linux-2.6.12-rc2 |
1445 1446 1447 |
csum = csum_partial_copy_nocheck(dptr+offset, to, len, 0); skb->csum = csum_block_add(skb->csum, csum, odd); |
e905a9eda [NET] IPV4: Fix w... |
1448 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1449 |
} |
e905a9eda [NET] IPV4: Fix w... |
1450 |
/* |
1da177e4c Linux-2.6.12-rc2 |
1451 |
* Generic function to send a packet as reply to another packet. |
be9f4a44e ipv4: tcp: remove... |
1452 |
* Used to send some TCP resets/acks so far. |
1da177e4c Linux-2.6.12-rc2 |
1453 |
* |
be9f4a44e ipv4: tcp: remove... |
1454 |
* Use a fake percpu inet socket to avoid false sharing and contention. |
1da177e4c Linux-2.6.12-rc2 |
1455 |
*/ |
be9f4a44e ipv4: tcp: remove... |
1456 1457 1458 1459 1460 1461 1462 1463 1464 |
static DEFINE_PER_CPU(struct inet_sock, unicast_sock) = { .sk = { .__sk_common = { .skc_refcnt = ATOMIC_INIT(1), }, .sk_wmem_alloc = ATOMIC_INIT(1), .sk_allocation = GFP_ATOMIC, .sk_flags = (1UL << SOCK_USE_WRITE_QUEUE), }, |
0980e56e5 ipv4: tcp: set un... |
1465 1466 |
.pmtudisc = IP_PMTUDISC_WANT, .uc_ttl = -1, |
be9f4a44e ipv4: tcp: remove... |
1467 |
}; |
24a2d43d8 ipv4: rename ip_o... |
1468 1469 1470 1471 |
void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, const struct ip_options *sopt, __be32 daddr, __be32 saddr, const struct ip_reply_arg *arg, |
70e734167 ipv4: Show that i... |
1472 |
unsigned int len) |
1da177e4c Linux-2.6.12-rc2 |
1473 |
{ |
f6d8bd051 inet: add RCU pro... |
1474 |
struct ip_options_data replyopts; |
1da177e4c Linux-2.6.12-rc2 |
1475 |
struct ipcm_cookie ipc; |
77968b782 ipv4: Pass flow k... |
1476 |
struct flowi4 fl4; |
511c3f92a net: skb->rtable ... |
1477 |
struct rtable *rt = skb_rtable(skb); |
be9f4a44e ipv4: tcp: remove... |
1478 1479 1480 |
struct sk_buff *nskb; struct sock *sk; struct inet_sock *inet; |
4062090e3 ipv4: dst_entry l... |
1481 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
1482 |
|
24a2d43d8 ipv4: rename ip_o... |
1483 |
if (__ip_options_echo(&replyopts.opt.opt, skb, sopt)) |
1da177e4c Linux-2.6.12-rc2 |
1484 |
return; |
0a5ebb800 ipv4: Pass explic... |
1485 |
ipc.addr = daddr; |
1da177e4c Linux-2.6.12-rc2 |
1486 |
ipc.opt = NULL; |
2244d07bf net: simplify fla... |
1487 |
ipc.tx_flags = 0; |
aa6615814 ipv4: processing ... |
1488 1489 |
ipc.ttl = 0; ipc.tos = -1; |
1da177e4c Linux-2.6.12-rc2 |
1490 |
|
f6d8bd051 inet: add RCU pro... |
1491 |
if (replyopts.opt.opt.optlen) { |
1da177e4c Linux-2.6.12-rc2 |
1492 |
ipc.opt = &replyopts.opt; |
f6d8bd051 inet: add RCU pro... |
1493 1494 |
if (replyopts.opt.opt.srr) daddr = replyopts.opt.opt.faddr; |
1da177e4c Linux-2.6.12-rc2 |
1495 |
} |
e110861f8 net: add a sysctl... |
1496 1497 |
flowi4_init_output(&fl4, arg->bound_dev_if, IP4_REPLY_MARK(net, skb->mark), |
66b13d99d ipv4: tcp: fix TO... |
1498 |
RT_TOS(arg->tos), |
be9f4a44e ipv4: tcp: remove... |
1499 |
RT_SCOPE_UNIVERSE, ip_hdr(skb)->protocol, |
77968b782 ipv4: Pass flow k... |
1500 |
ip_reply_arg_flowi_flags(arg), |
70e734167 ipv4: Show that i... |
1501 |
daddr, saddr, |
77968b782 ipv4: Pass flow k... |
1502 1503 |
tcp_hdr(skb)->source, tcp_hdr(skb)->dest); security_skb_classify_flow(skb, flowi4_to_flowi(&fl4)); |
be9f4a44e ipv4: tcp: remove... |
1504 |
rt = ip_route_output_key(net, &fl4); |
77968b782 ipv4: Pass flow k... |
1505 1506 |
if (IS_ERR(rt)) return; |
1da177e4c Linux-2.6.12-rc2 |
1507 |
|
be9f4a44e ipv4: tcp: remove... |
1508 |
inet = &get_cpu_var(unicast_sock); |
1da177e4c Linux-2.6.12-rc2 |
1509 |
|
66b13d99d ipv4: tcp: fix TO... |
1510 |
inet->tos = arg->tos; |
be9f4a44e ipv4: tcp: remove... |
1511 |
sk = &inet->sk; |
1da177e4c Linux-2.6.12-rc2 |
1512 |
sk->sk_priority = skb->priority; |
eddc9ec53 [SK_BUFF]: Introd... |
1513 |
sk->sk_protocol = ip_hdr(skb)->protocol; |
f0e48dbfc [TCP]: Honour sk_... |
1514 |
sk->sk_bound_dev_if = arg->bound_dev_if; |
be9f4a44e ipv4: tcp: remove... |
1515 1516 1517 |
sock_net_set(sk, net); __skb_queue_head_init(&sk->sk_write_queue); sk->sk_sndbuf = sysctl_wmem_default; |
4062090e3 ipv4: dst_entry l... |
1518 1519 1520 1521 1522 1523 |
err = ip_append_data(sk, &fl4, ip_reply_glue_bits, arg->iov->iov_base, len, 0, &ipc, &rt, MSG_DONTWAIT); if (unlikely(err)) { ip_flush_pending_frames(sk); goto out; } |
be9f4a44e ipv4: tcp: remove... |
1524 1525 |
nskb = skb_peek(&sk->sk_write_queue); if (nskb) { |
1da177e4c Linux-2.6.12-rc2 |
1526 |
if (arg->csumoffset >= 0) |
be9f4a44e ipv4: tcp: remove... |
1527 1528 |
*((__sum16 *)skb_transport_header(nskb) + arg->csumoffset) = csum_fold(csum_add(nskb->csum, |
9c70220b7 [SK_BUFF]: Introd... |
1529 |
arg->csum)); |
be9f4a44e ipv4: tcp: remove... |
1530 |
nskb->ip_summed = CHECKSUM_NONE; |
3a7c384ff ipv4: tcp: unicas... |
1531 |
skb_orphan(nskb); |
be9f4a44e ipv4: tcp: remove... |
1532 |
skb_set_queue_mapping(nskb, skb_get_queue_mapping(skb)); |
77968b782 ipv4: Pass flow k... |
1533 |
ip_push_pending_frames(sk, &fl4); |
1da177e4c Linux-2.6.12-rc2 |
1534 |
} |
4062090e3 ipv4: dst_entry l... |
1535 |
out: |
be9f4a44e ipv4: tcp: remove... |
1536 |
put_cpu_var(unicast_sock); |
1da177e4c Linux-2.6.12-rc2 |
1537 1538 1539 |
ip_rt_put(rt); } |
1da177e4c Linux-2.6.12-rc2 |
1540 1541 |
void __init ip_init(void) { |
1da177e4c Linux-2.6.12-rc2 |
1542 1543 |
ip_rt_init(); inet_initpeers(); |
72c1d3bdd ipv4: register ig... |
1544 1545 |
#if defined(CONFIG_IP_MULTICAST) igmp_mc_init(); |
1da177e4c Linux-2.6.12-rc2 |
1546 1547 |
#endif } |