From: Vlad Yasevich Date: Sat, 31 Jan 2015 15:40:15 +0000 (-0500) Subject: ipv6: introduce ipv6_make_skb X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6422398c2ab09268a55112f98cbf96bbf0184328;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git ipv6: introduce ipv6_make_skb This commit is very similar to commit 1c32c5ad6fac8cee1a77449f5abf211e911ff830 Author: Herbert Xu Date: Tue Mar 1 02:36:47 2011 +0000 inet: Add ip_make_skb and ip_finish_skb It adds IPv6 version of the helpers ip6_make_skb and ip6_finish_skb. The job of ip6_make_skb is to collect messages into an ipv6 packet and poplulate ipv6 eader. The job of ip6_finish_skb is to transmit the generated skb. Together they replicated the job of ip6_push_pending_frames() while also provide the capability to be called independently. This will be needed to add lockless UDP sendmsg support. Signed-off-by: Vladislav Yasevich Signed-off-by: David S. Miller --- diff --git a/include/net/ipv6.h b/include/net/ipv6.h index 4292929392b0..8027ca53e31f 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -788,6 +788,25 @@ int ip6_push_pending_frames(struct sock *sk); void ip6_flush_pending_frames(struct sock *sk); +int ip6_send_skb(struct sk_buff *skb); + +struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, + struct inet_cork_full *cork, + struct inet6_cork *v6_cork); +struct sk_buff *ip6_make_skb(struct sock *sk, + int getfrag(void *from, char *to, int offset, + int len, int odd, struct sk_buff *skb), + void *from, int length, int transhdrlen, + int hlimit, int tclass, struct ipv6_txoptions *opt, + struct flowi6 *fl6, struct rt6_info *rt, + unsigned int flags, int dontfrag); + +static inline struct sk_buff *ip6_finish_skb(struct sock *sk) +{ + return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, + &inet6_sk(sk)->cork); +} + int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6); struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, const struct in6_addr *final_dst); diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 1b66453a695d..b89d3c27dac7 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1564,22 +1564,23 @@ static void ip6_cork_release(struct inet_cork_full *cork, memset(&cork->fl, 0, sizeof(cork->fl)); } -int ip6_push_pending_frames(struct sock *sk) +struct sk_buff *__ip6_make_skb(struct sock *sk, + struct sk_buff_head *queue, + struct inet_cork_full *cork, + struct inet6_cork *v6_cork) { struct sk_buff *skb, *tmp_skb; struct sk_buff **tail_skb; struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; - struct inet_sock *inet = inet_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk); struct net *net = sock_net(sk); struct ipv6hdr *hdr; - struct ipv6_txoptions *opt = np->cork.opt; - struct rt6_info *rt = (struct rt6_info *)inet->cork.base.dst; - struct flowi6 *fl6 = &inet->cork.fl.u.ip6; + struct ipv6_txoptions *opt = v6_cork->opt; + struct rt6_info *rt = (struct rt6_info *)cork->base.dst; + struct flowi6 *fl6 = &cork->fl.u.ip6; unsigned char proto = fl6->flowi6_proto; - int err = 0; - skb = __skb_dequeue(&sk->sk_write_queue); + skb = __skb_dequeue(queue); if (skb == NULL) goto out; tail_skb = &(skb_shinfo(skb)->frag_list); @@ -1587,7 +1588,7 @@ int ip6_push_pending_frames(struct sock *sk) /* move skb->data to ip header from ext header */ if (skb->data < skb_network_header(skb)) __skb_pull(skb, skb_network_offset(skb)); - while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { + while ((tmp_skb = __skb_dequeue(queue)) != NULL) { __skb_pull(tmp_skb, skb_network_header_len(skb)); *tail_skb = tmp_skb; tail_skb = &(tmp_skb->next); @@ -1612,10 +1613,10 @@ int ip6_push_pending_frames(struct sock *sk) skb_reset_network_header(skb); hdr = ipv6_hdr(skb); - ip6_flow_hdr(hdr, np->cork.tclass, + ip6_flow_hdr(hdr, v6_cork->tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel, np->autoflowlabel)); - hdr->hop_limit = np->cork.hop_limit; + hdr->hop_limit = v6_cork->hop_limit; hdr->nexthdr = proto; hdr->saddr = fl6->saddr; hdr->daddr = *final_dst; @@ -1632,25 +1633,45 @@ int ip6_push_pending_frames(struct sock *sk) ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); } + ip6_cork_release(cork, v6_cork); +out: + return skb; +} + +int ip6_send_skb(struct sk_buff *skb) +{ + struct net *net = sock_net(skb->sk); + struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); + int err; + err = ip6_local_out(skb); if (err) { if (err > 0) err = net_xmit_errno(err); if (err) - goto error; + IP6_INC_STATS(net, rt->rt6i_idev, + IPSTATS_MIB_OUTDISCARDS); } -out: - ip6_cork_release(&inet->cork, &np->cork); return err; -error: - IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); - goto out; +} + +int ip6_push_pending_frames(struct sock *sk) +{ + struct sk_buff *skb; + + skb = ip6_finish_skb(sk); + if (!skb) + return 0; + + return ip6_send_skb(skb); } EXPORT_SYMBOL_GPL(ip6_push_pending_frames); static void __ip6_flush_pending_frames(struct sock *sk, - struct sk_buff_head *queue) + struct sk_buff_head *queue, + struct inet_cork_full *cork, + struct inet6_cork *v6_cork) { struct sk_buff *skb; @@ -1661,11 +1682,55 @@ static void __ip6_flush_pending_frames(struct sock *sk, kfree_skb(skb); } - ip6_cork_release(&inet_sk(sk)->cork, &inet6_sk(sk)->cork); + ip6_cork_release(cork, v6_cork); } void ip6_flush_pending_frames(struct sock *sk) { - __ip6_flush_pending_frames(sk, &sk->sk_write_queue); + __ip6_flush_pending_frames(sk, &sk->sk_write_queue, + &inet_sk(sk)->cork, &inet6_sk(sk)->cork); } EXPORT_SYMBOL_GPL(ip6_flush_pending_frames); + +struct sk_buff *ip6_make_skb(struct sock *sk, + int getfrag(void *from, char *to, int offset, + int len, int odd, struct sk_buff *skb), + void *from, int length, int transhdrlen, + int hlimit, int tclass, + struct ipv6_txoptions *opt, struct flowi6 *fl6, + struct rt6_info *rt, unsigned int flags, + int dontfrag) +{ + struct inet_cork_full cork; + struct inet6_cork v6_cork; + struct sk_buff_head queue; + int exthdrlen = (opt ? opt->opt_flen : 0); + int err; + + if (flags & MSG_PROBE) + return NULL; + + __skb_queue_head_init(&queue); + + cork.base.flags = 0; + cork.base.addr = 0; + cork.base.opt = NULL; + v6_cork.opt = NULL; + err = ip6_setup_cork(sk, &cork, &v6_cork, hlimit, tclass, opt, rt, fl6); + if (err) + return ERR_PTR(err); + + if (dontfrag < 0) + dontfrag = inet6_sk(sk)->dontfrag; + + err = __ip6_append_data(sk, fl6, &queue, &cork.base, &v6_cork, + ¤t->task_frag, getfrag, from, + length + exthdrlen, transhdrlen + exthdrlen, + flags, dontfrag); + if (err) { + __ip6_flush_pending_frames(sk, &queue, &cork, &v6_cork); + return ERR_PTR(err); + } + + return __ip6_make_skb(sk, &queue, &cork, &v6_cork); +}