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165 lines
3.7 KiB
165 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* IPv6 library code, needed by static components when full IPv6 support is |
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* not configured or static. These functions are needed by GSO/GRO implementation. |
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*/ |
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#include <linux/export.h> |
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#include <net/ip.h> |
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#include <net/ipv6.h> |
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#include <net/ip6_fib.h> |
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#include <net/addrconf.h> |
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#include <net/secure_seq.h> |
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#include <linux/netfilter.h> |
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static u32 __ipv6_select_ident(struct net *net, |
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const struct in6_addr *dst, |
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const struct in6_addr *src) |
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{ |
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u32 id; |
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do { |
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id = prandom_u32(); |
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} while (!id); |
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return id; |
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} |
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/* This function exists only for tap drivers that must support broken |
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* clients requesting UFO without specifying an IPv6 fragment ID. |
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* |
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* This is similar to ipv6_select_ident() but we use an independent hash |
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* seed to limit information leakage. |
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* |
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* The network header must be set before calling this. |
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*/ |
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__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb) |
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{ |
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struct in6_addr buf[2]; |
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struct in6_addr *addrs; |
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u32 id; |
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addrs = skb_header_pointer(skb, |
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skb_network_offset(skb) + |
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offsetof(struct ipv6hdr, saddr), |
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sizeof(buf), buf); |
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if (!addrs) |
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return 0; |
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id = __ipv6_select_ident(net, &addrs[1], &addrs[0]); |
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return htonl(id); |
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} |
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EXPORT_SYMBOL_GPL(ipv6_proxy_select_ident); |
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__be32 ipv6_select_ident(struct net *net, |
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const struct in6_addr *daddr, |
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const struct in6_addr *saddr) |
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{ |
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u32 id; |
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id = __ipv6_select_ident(net, daddr, saddr); |
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return htonl(id); |
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} |
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EXPORT_SYMBOL(ipv6_select_ident); |
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int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) |
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{ |
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unsigned int offset = sizeof(struct ipv6hdr); |
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unsigned int packet_len = skb_tail_pointer(skb) - |
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skb_network_header(skb); |
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int found_rhdr = 0; |
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*nexthdr = &ipv6_hdr(skb)->nexthdr; |
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while (offset <= packet_len) { |
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struct ipv6_opt_hdr *exthdr; |
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switch (**nexthdr) { |
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case NEXTHDR_HOP: |
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break; |
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case NEXTHDR_ROUTING: |
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found_rhdr = 1; |
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break; |
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case NEXTHDR_DEST: |
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#if IS_ENABLED(CONFIG_IPV6_MIP6) |
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if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
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break; |
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#endif |
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if (found_rhdr) |
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return offset; |
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break; |
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default: |
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return offset; |
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} |
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if (offset + sizeof(struct ipv6_opt_hdr) > packet_len) |
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return -EINVAL; |
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exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
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offset); |
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offset += ipv6_optlen(exthdr); |
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if (offset > IPV6_MAXPLEN) |
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return -EINVAL; |
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*nexthdr = &exthdr->nexthdr; |
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} |
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return -EINVAL; |
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} |
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EXPORT_SYMBOL(ip6_find_1stfragopt); |
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#if IS_ENABLED(CONFIG_IPV6) |
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int ip6_dst_hoplimit(struct dst_entry *dst) |
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{ |
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int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
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if (hoplimit == 0) { |
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struct net_device *dev = dst->dev; |
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struct inet6_dev *idev; |
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rcu_read_lock(); |
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idev = __in6_dev_get(dev); |
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if (idev) |
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hoplimit = idev->cnf.hop_limit; |
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else |
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hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
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rcu_read_unlock(); |
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} |
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return hoplimit; |
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} |
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EXPORT_SYMBOL(ip6_dst_hoplimit); |
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#endif |
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int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
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{ |
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int len; |
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len = skb->len - sizeof(struct ipv6hdr); |
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if (len > IPV6_MAXPLEN) |
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len = 0; |
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ipv6_hdr(skb)->payload_len = htons(len); |
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IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |
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/* if egress device is enslaved to an L3 master device pass the |
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* skb to its handler for processing |
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*/ |
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skb = l3mdev_ip6_out(sk, skb); |
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if (unlikely(!skb)) |
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return 0; |
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skb->protocol = htons(ETH_P_IPV6); |
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return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
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net, sk, skb, NULL, skb_dst(skb)->dev, |
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dst_output); |
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} |
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EXPORT_SYMBOL_GPL(__ip6_local_out); |
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int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
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{ |
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int err; |
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err = __ip6_local_out(net, sk, skb); |
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if (likely(err == 1)) |
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err = dst_output(net, sk, skb); |
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return err; |
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} |
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EXPORT_SYMBOL_GPL(ip6_local_out);
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