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[73.202.182.113]) by smtp.gmail.com with ESMTPSA id r18sm3889905pfc.3.2019.10.03.14.58.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 03 Oct 2019 14:58:34 -0700 (PDT) From: Tom Herbert To: davem@davemloft.net, netdev@vger.kernel.org Cc: Tom Herbert , Tom Herbert Subject: [PATCH v5 net-next 2/7] ipeh: Move generic EH functions to exthdrs_common.c Date: Thu, 3 Oct 2019 14:57:59 -0700 Message-Id: <1570139884-20183-3-git-send-email-tom@herbertland.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1570139884-20183-1-git-send-email-tom@herbertland.com> References: <1570139884-20183-1-git-send-email-tom@herbertland.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Tom Herbert Move generic functions in exthdrs.c to new exthdrs_common.c so that exthdrs.c only contains functions that are specific to IPv6 processing, and exthdrs_common.c contains functions that are generic. These functions include those that will be used with IPv4 extension headers. Generic extension header related functions are prefixed by ipeh_. Signed-off-by: Tom Herbert --- include/net/ipeh.h | 12 ++++ include/net/ipv6.h | 9 --- net/dccp/ipv6.c | 2 +- net/ipv6/Kconfig | 4 ++ net/ipv6/Makefile | 1 + net/ipv6/calipso.c | 6 +- net/ipv6/exthdrs.c | 138 -------------------------------------------- net/ipv6/exthdrs_common.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++ net/ipv6/ipv6_sockglue.c | 2 +- net/ipv6/raw.c | 2 +- net/ipv6/tcp_ipv6.c | 2 +- net/ipv6/udp.c | 2 +- net/l2tp/l2tp_ip6.c | 2 +- net/sctp/ipv6.c | 2 +- 14 files changed, 171 insertions(+), 157 deletions(-) create mode 100644 net/ipv6/exthdrs_common.c diff --git a/include/net/ipeh.h b/include/net/ipeh.h index ec2d186..3b24831 100644 --- a/include/net/ipeh.h +++ b/include/net/ipeh.h @@ -19,4 +19,16 @@ struct tlvtype_proc { extern const struct tlvtype_proc tlvprocdestopt_lst[]; extern const struct tlvtype_proc tlvprochopopt_lst[]; +struct ipv6_txoptions; +struct ipv6_opt_hdr; + +struct ipv6_txoptions *ipeh_dup_options(struct sock *sk, + struct ipv6_txoptions *opt); +struct ipv6_txoptions *ipeh_renew_options(struct sock *sk, + struct ipv6_txoptions *opt, + int newtype, + struct ipv6_opt_hdr *newopt); +struct ipv6_txoptions *ipeh_fixup_options(struct ipv6_txoptions *opt_space, + struct ipv6_txoptions *opt); + #endif /* _NET_IPEH_H */ diff --git a/include/net/ipv6.h b/include/net/ipv6.h index 6fc584c..d34c36c 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -429,15 +429,6 @@ int ip6_ra_control(struct sock *sk, int sel); int ipv6_parse_hopopts(struct sk_buff *skb); -struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, - struct ipv6_txoptions *opt); -struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, - struct ipv6_txoptions *opt, - int newtype, - struct ipv6_opt_hdr *newopt); -struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, - struct ipv6_txoptions *opt); - bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, const struct inet6_skb_parm *opt); struct ipv6_txoptions *ipv6_update_options(struct sock *sk, diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c index 25aab67..b8843c1 100644 --- a/net/dccp/ipv6.c +++ b/net/dccp/ipv6.c @@ -515,7 +515,7 @@ static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, if (!opt) opt = rcu_dereference(np->opt); if (opt) { - opt = ipv6_dup_options(newsk, opt); + opt = ipeh_dup_options(newsk, opt); RCU_INIT_POINTER(newnp->opt, opt); } inet_csk(newsk)->icsk_ext_hdr_len = 0; diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig index ae1344e..700fcea 100644 --- a/net/ipv6/Kconfig +++ b/net/ipv6/Kconfig @@ -3,9 +3,13 @@ # IPv6 configuration # +config EXTHDRS + bool + # IPv6 as module will cause a CRASH if you try to unload it menuconfig IPV6 tristate "The IPv6 protocol" + select EXTHDRS default y ---help--- Support for IP version 6 (IPv6). diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile index df3919b..0bcab81 100644 --- a/net/ipv6/Makefile +++ b/net/ipv6/Makefile @@ -44,6 +44,7 @@ obj-$(CONFIG_IPV6_SIT) += sit.o obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o obj-$(CONFIG_IPV6_GRE) += ip6_gre.o obj-$(CONFIG_IPV6_FOU) += fou6.o +obj-$(CONFIG_EXTHDRS) += exthdrs_common.o obj-y += addrconf_core.o exthdrs_core.o ip6_checksum.o ip6_icmp.o obj-$(CONFIG_INET) += output_core.o protocol.o $(ipv6-offload) diff --git a/net/ipv6/calipso.c b/net/ipv6/calipso.c index 221c81f..9c84848 100644 --- a/net/ipv6/calipso.c +++ b/net/ipv6/calipso.c @@ -785,7 +785,7 @@ static int calipso_opt_update(struct sock *sk, struct ipv6_opt_hdr *hop) { struct ipv6_txoptions *old = txopt_get(inet6_sk(sk)), *txopts; - txopts = ipv6_renew_options(sk, old, IPV6_HOPOPTS, hop); + txopts = ipeh_renew_options(sk, old, IPV6_HOPOPTS, hop); txopt_put(old); if (IS_ERR(txopts)) return PTR_ERR(txopts); @@ -1207,7 +1207,7 @@ static int calipso_req_setattr(struct request_sock *req, if (IS_ERR(new)) return PTR_ERR(new); - txopts = ipv6_renew_options(sk, req_inet->ipv6_opt, IPV6_HOPOPTS, new); + txopts = ipeh_renew_options(sk, req_inet->ipv6_opt, IPV6_HOPOPTS, new); kfree(new); @@ -1244,7 +1244,7 @@ static void calipso_req_delattr(struct request_sock *req) if (calipso_opt_del(req_inet->ipv6_opt->hopopt, &new)) return; /* Nothing to do */ - txopts = ipv6_renew_options(sk, req_inet->ipv6_opt, IPV6_HOPOPTS, new); + txopts = ipeh_renew_options(sk, req_inet->ipv6_opt, IPV6_HOPOPTS, new); if (!IS_ERR(txopts)) { txopts = xchg(&req_inet->ipv6_opt, txopts); diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c index 664491e..e12d3a5 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -784,144 +784,6 @@ void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *pr } EXPORT_SYMBOL(ipv6_push_frag_opts); -struct ipv6_txoptions * -ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt) -{ - struct ipv6_txoptions *opt2; - - opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); - if (opt2) { - long dif = (char *)opt2 - (char *)opt; - memcpy(opt2, opt, opt->tot_len); - if (opt2->hopopt) - *((char **)&opt2->hopopt) += dif; - if (opt2->dst0opt) - *((char **)&opt2->dst0opt) += dif; - if (opt2->dst1opt) - *((char **)&opt2->dst1opt) += dif; - if (opt2->srcrt) - *((char **)&opt2->srcrt) += dif; - refcount_set(&opt2->refcnt, 1); - } - return opt2; -} -EXPORT_SYMBOL_GPL(ipv6_dup_options); - -static void ipv6_renew_option(int renewtype, - struct ipv6_opt_hdr **dest, - struct ipv6_opt_hdr *old, - struct ipv6_opt_hdr *new, - int newtype, char **p) -{ - struct ipv6_opt_hdr *src; - - src = (renewtype == newtype ? new : old); - if (!src) - return; - - memcpy(*p, src, ipv6_optlen(src)); - *dest = (struct ipv6_opt_hdr *)*p; - *p += CMSG_ALIGN(ipv6_optlen(*dest)); -} - -/** - * ipv6_renew_options - replace a specific ext hdr with a new one. - * - * @sk: sock from which to allocate memory - * @opt: original options - * @newtype: option type to replace in @opt - * @newopt: new option of type @newtype to replace (user-mem) - * @newoptlen: length of @newopt - * - * Returns a new set of options which is a copy of @opt with the - * option type @newtype replaced with @newopt. - * - * @opt may be NULL, in which case a new set of options is returned - * containing just @newopt. - * - * @newopt may be NULL, in which case the specified option type is - * not copied into the new set of options. - * - * The new set of options is allocated from the socket option memory - * buffer of @sk. - */ -struct ipv6_txoptions * -ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, - int newtype, struct ipv6_opt_hdr *newopt) -{ - int tot_len = 0; - char *p; - struct ipv6_txoptions *opt2; - - if (opt) { - if (newtype != IPV6_HOPOPTS && opt->hopopt) - tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); - if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) - tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); - if (newtype != IPV6_RTHDR && opt->srcrt) - tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); - if (newtype != IPV6_DSTOPTS && opt->dst1opt) - tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); - } - - if (newopt) - tot_len += CMSG_ALIGN(ipv6_optlen(newopt)); - - if (!tot_len) - return NULL; - - tot_len += sizeof(*opt2); - opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); - if (!opt2) - return ERR_PTR(-ENOBUFS); - - memset(opt2, 0, tot_len); - refcount_set(&opt2->refcnt, 1); - opt2->tot_len = tot_len; - p = (char *)(opt2 + 1); - - ipv6_renew_option(IPV6_HOPOPTS, &opt2->hopopt, - (opt ? opt->hopopt : NULL), - newopt, newtype, &p); - ipv6_renew_option(IPV6_RTHDRDSTOPTS, &opt2->dst0opt, - (opt ? opt->dst0opt : NULL), - newopt, newtype, &p); - ipv6_renew_option(IPV6_RTHDR, - (struct ipv6_opt_hdr **)&opt2->srcrt, - (opt ? (struct ipv6_opt_hdr *)opt->srcrt : NULL), - newopt, newtype, &p); - ipv6_renew_option(IPV6_DSTOPTS, &opt2->dst1opt, - (opt ? opt->dst1opt : NULL), - newopt, newtype, &p); - - opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + - (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + - (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); - opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); - - return opt2; -} - -struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, - struct ipv6_txoptions *opt) -{ - /* - * ignore the dest before srcrt unless srcrt is being included. - * --yoshfuji - */ - if (opt && opt->dst0opt && !opt->srcrt) { - if (opt_space != opt) { - memcpy(opt_space, opt, sizeof(*opt_space)); - opt = opt_space; - } - opt->opt_nflen -= ipv6_optlen(opt->dst0opt); - opt->dst0opt = NULL; - } - - return opt; -} -EXPORT_SYMBOL_GPL(ipv6_fixup_options); - /** * fl6_update_dst - update flowi destination address with info given * by srcrt option, if any. diff --git a/net/ipv6/exthdrs_common.c b/net/ipv6/exthdrs_common.c new file mode 100644 index 0000000..2c68184 --- /dev/null +++ b/net/ipv6/exthdrs_common.c @@ -0,0 +1,144 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* Extension header and TLV library code that is not specific to IPv6. */ +#include +#include + +struct ipv6_txoptions * +ipeh_dup_options(struct sock *sk, struct ipv6_txoptions *opt) +{ + struct ipv6_txoptions *opt2; + + opt2 = sock_kmalloc(sk, opt->tot_len, GFP_ATOMIC); + if (opt2) { + long dif = (char *)opt2 - (char *)opt; + + memcpy(opt2, opt, opt->tot_len); + if (opt2->hopopt) + *((char **)&opt2->hopopt) += dif; + if (opt2->dst0opt) + *((char **)&opt2->dst0opt) += dif; + if (opt2->dst1opt) + *((char **)&opt2->dst1opt) += dif; + if (opt2->srcrt) + *((char **)&opt2->srcrt) += dif; + refcount_set(&opt2->refcnt, 1); + } + return opt2; +} +EXPORT_SYMBOL_GPL(ipeh_dup_options); + +static void ipeh_renew_option(int renewtype, + struct ipv6_opt_hdr **dest, + struct ipv6_opt_hdr *old, + struct ipv6_opt_hdr *new, + int newtype, char **p) +{ + struct ipv6_opt_hdr *src; + + src = (renewtype == newtype ? new : old); + if (!src) + return; + + memcpy(*p, src, ipv6_optlen(src)); + *dest = (struct ipv6_opt_hdr *)*p; + *p += CMSG_ALIGN(ipv6_optlen(*dest)); +} + +/** + * ipeh_renew_options - replace a specific ext hdr with a new one. + * + * @sk: sock from which to allocate memory + * @opt: original options + * @newtype: option type to replace in @opt + * @newopt: new option of type @newtype to replace (user-mem) + * @newoptlen: length of @newopt + * + * Returns a new set of options which is a copy of @opt with the + * option type @newtype replaced with @newopt. + * + * @opt may be NULL, in which case a new set of options is returned + * containing just @newopt. + * + * @newopt may be NULL, in which case the specified option type is + * not copied into the new set of options. + * + * The new set of options is allocated from the socket option memory + * buffer of @sk. + */ +struct ipv6_txoptions * +ipeh_renew_options(struct sock *sk, struct ipv6_txoptions *opt, + int newtype, struct ipv6_opt_hdr *newopt) +{ + int tot_len = 0; + char *p; + struct ipv6_txoptions *opt2; + + if (opt) { + if (newtype != IPV6_HOPOPTS && opt->hopopt) + tot_len += CMSG_ALIGN(ipv6_optlen(opt->hopopt)); + if (newtype != IPV6_RTHDRDSTOPTS && opt->dst0opt) + tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst0opt)); + if (newtype != IPV6_RTHDR && opt->srcrt) + tot_len += CMSG_ALIGN(ipv6_optlen(opt->srcrt)); + if (newtype != IPV6_DSTOPTS && opt->dst1opt) + tot_len += CMSG_ALIGN(ipv6_optlen(opt->dst1opt)); + } + + if (newopt) + tot_len += CMSG_ALIGN(ipv6_optlen(newopt)); + + if (!tot_len) + return NULL; + + tot_len += sizeof(*opt2); + opt2 = sock_kmalloc(sk, tot_len, GFP_ATOMIC); + if (!opt2) + return ERR_PTR(-ENOBUFS); + + memset(opt2, 0, tot_len); + refcount_set(&opt2->refcnt, 1); + opt2->tot_len = tot_len; + p = (char *)(opt2 + 1); + + ipeh_renew_option(IPV6_HOPOPTS, &opt2->hopopt, + (opt ? opt->hopopt : NULL), + newopt, newtype, &p); + ipeh_renew_option(IPV6_RTHDRDSTOPTS, &opt2->dst0opt, + (opt ? opt->dst0opt : NULL), + newopt, newtype, &p); + ipeh_renew_option(IPV6_RTHDR, + (struct ipv6_opt_hdr **)&opt2->srcrt, + (opt ? (struct ipv6_opt_hdr *)opt->srcrt : NULL), + newopt, newtype, &p); + ipeh_renew_option(IPV6_DSTOPTS, &opt2->dst1opt, + (opt ? opt->dst1opt : NULL), + newopt, newtype, &p); + + opt2->opt_nflen = (opt2->hopopt ? ipv6_optlen(opt2->hopopt) : 0) + + (opt2->dst0opt ? ipv6_optlen(opt2->dst0opt) : 0) + + (opt2->srcrt ? ipv6_optlen(opt2->srcrt) : 0); + opt2->opt_flen = (opt2->dst1opt ? ipv6_optlen(opt2->dst1opt) : 0); + + return opt2; +} +EXPORT_SYMBOL(ipeh_renew_options); + +struct ipv6_txoptions *ipeh_fixup_options(struct ipv6_txoptions *opt_space, + struct ipv6_txoptions *opt) +{ + /* ignore the dest before srcrt unless srcrt is being included. + * --yoshfuji + */ + if (opt && opt->dst0opt && !opt->srcrt) { + if (opt_space != opt) { + memcpy(opt_space, opt, sizeof(*opt_space)); + opt = opt_space; + } + opt->opt_nflen -= ipv6_optlen(opt->dst0opt); + opt->dst0opt = NULL; + } + + return opt; +} +EXPORT_SYMBOL_GPL(ipeh_fixup_options); diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index 264c292..8755ecc 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -427,7 +427,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); - opt = ipv6_renew_options(sk, opt, optname, new); + opt = ipeh_renew_options(sk, opt, optname, new); kfree(new); if (IS_ERR(opt)) { retv = PTR_ERR(opt); diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index 6e1888e..ace11b7 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -889,7 +889,7 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) } if (flowlabel) opt = fl6_merge_options(&opt_space, flowlabel, opt); - opt = ipv6_fixup_options(&opt_space, opt); + opt = ipeh_fixup_options(&opt_space, opt); fl6.flowi6_proto = proto; fl6.flowi6_mark = ipc6.sockc.mark; diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index e3d9f45..9c761c7 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1249,7 +1249,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff * if (!opt) opt = rcu_dereference(np->opt); if (opt) { - opt = ipv6_dup_options(newsk, opt); + opt = ipeh_dup_options(newsk, opt); RCU_INIT_POINTER(newnp->opt, opt); } inet_csk(newsk)->icsk_ext_hdr_len = 0; diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index aae4938..a1fbd47 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -1386,7 +1386,7 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) } if (flowlabel) opt = fl6_merge_options(&opt_space, flowlabel, opt); - opt = ipv6_fixup_options(&opt_space, opt); + opt = ipeh_fixup_options(&opt_space, opt); ipc6.opt = opt; fl6.flowi6_proto = sk->sk_protocol; diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c index 687e23a..bc4925c 100644 --- a/net/l2tp/l2tp_ip6.c +++ b/net/l2tp/l2tp_ip6.c @@ -590,7 +590,7 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) } if (flowlabel) opt = fl6_merge_options(&opt_space, flowlabel, opt); - opt = ipv6_fixup_options(&opt_space, opt); + opt = ipeh_fixup_options(&opt_space, opt); ipc6.opt = opt; fl6.flowi6_proto = sk->sk_protocol; diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index dd860fe..39d0eec 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -441,7 +441,7 @@ static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk) rcu_read_lock(); opt = rcu_dereference(np->opt); if (opt) { - opt = ipv6_dup_options(newsk, opt); + opt = ipeh_dup_options(newsk, opt); if (!opt) pr_err("%s: Failed to copy ip options\n", __func__); } -- 2.7.4