/* * xfrm6_output.c - Common IPsec encapsulation code for IPv6. * Copyright (C) 2002 USAGI/WIDE Project * Copyright (c) 2004 Herbert Xu * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include #include #include #include #include #include #include #include #include #include int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, u8 **prevhdr) { return ip6_find_1stfragopt(skb, prevhdr); } EXPORT_SYMBOL(xfrm6_find_1stfragopt); static int xfrm6_local_dontfrag(struct sk_buff *skb) { int proto; struct sock *sk = skb->sk; if (sk) { if (sk->sk_family != AF_INET6) return 0; proto = sk->sk_protocol; if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) return inet6_sk(sk)->dontfrag; } return 0; } static void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu) { struct flowi6 fl6; struct sock *sk = skb->sk; fl6.flowi6_oif = sk->sk_bound_dev_if; fl6.daddr = ipv6_hdr(skb)->daddr; ipv6_local_rxpmtu(sk, &fl6, mtu); } void xfrm6_local_error(struct sk_buff *skb, u32 mtu) { struct flowi6 fl6; const struct ipv6hdr *hdr; struct sock *sk = skb->sk; hdr = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb); fl6.fl6_dport = inet_sk(sk)->inet_dport; fl6.daddr = hdr->daddr; ipv6_local_error(sk, EMSGSIZE, &fl6, mtu); } static int xfrm6_tunnel_check_size(struct sk_buff *skb) { int mtu, ret = 0; struct dst_entry *dst = skb_dst(skb); mtu = dst_mtu(dst); if (mtu < IPV6_MIN_MTU) mtu = IPV6_MIN_MTU; if (!skb->ignore_df && skb->len > mtu) { skb->dev = dst->dev; skb->protocol = htons(ETH_P_IPV6); if (xfrm6_local_dontfrag(skb)) xfrm6_local_rxpmtu(skb, mtu); else if (skb->sk) xfrm_local_error(skb, mtu); else icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); ret = -EMSGSIZE; } return ret; } int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb) { int err; err = xfrm6_tunnel_check_size(skb); if (err) return err; XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr; return xfrm6_extract_header(skb); } int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb) { int err; err = xfrm_inner_extract_output(x, skb); if (err) return err; skb->ignore_df = 1; skb->protocol = htons(ETH_P_IPV6); return x->outer_mode->output2(x, skb); } EXPORT_SYMBOL(xfrm6_prepare_output); int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb) { memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); #ifdef CONFIG_NETFILTER IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED; #endif return xfrm_output(sk, skb); } static int __xfrm6_output_finish(struct net *net, struct sock *sk, struct sk_buff *skb) { struct xfrm_state *x = skb_dst(skb)->xfrm; return x->outer_mode->afinfo->output_finish(sk, skb); } static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb) { struct dst_entry *dst = skb_dst(skb); struct xfrm_state *x = dst->xfrm; int mtu; bool toobig; #ifdef CONFIG_NETFILTER if (!x) { IP6CB(skb)->flags |= IP6SKB_REROUTED; return dst_output(net, sk, skb); } #endif if (x->props.mode != XFRM_MODE_TUNNEL) goto skip_frag; if (skb->protocol == htons(ETH_P_IPV6)) mtu = ip6_skb_dst_mtu(skb); else mtu = dst_mtu(skb_dst(skb)); toobig = skb->len > mtu && !skb_is_gso(skb); if (toobig && xfrm6_local_dontfrag(skb)) { xfrm6_local_rxpmtu(skb, mtu); return -EMSGSIZE; } else if (!skb->ignore_df && toobig && skb->sk) { xfrm_local_error(skb, mtu); return -EMSGSIZE; } if (toobig || dst_allfrag(skb_dst(skb))) return ip6_fragment(net, sk, skb, __xfrm6_output_finish); skip_frag: return x->outer_mode->afinfo->output_finish(sk, skb); } int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb) { return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, net, sk, skb, NULL, skb_dst(skb)->dev, __xfrm6_output, !(IP6CB(skb)->flags & IP6SKB_REROUTED)); } lue='40'>40space:mode:
authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-30 19:27:10 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-31 09:13:49 -0500
commit79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree370efda701f03cccf21e02bb1fdd3b852547d75c /tools/perf/builtin-diff.c
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'tools/perf/builtin-diff.c')