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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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netfilter: xtables: replace XT_MATCH_ITERATE macro
The macro is replaced by a list.h-like foreach loop. This makes the code more inspectable. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Jan Engelhardt
Patrick McHardy
parent
0559518b5b
commit
dcea992aca
@ -120,6 +120,7 @@ struct xt_counters_info {
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#define XT_INV_PROTO 0x40 /* Invert the sense of PROTO. */
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#ifndef __KERNEL__
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/* fn returns 0 to continue iteration */
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#define XT_MATCH_ITERATE(type, e, fn, args...) \
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({ \
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@ -139,7 +140,6 @@ struct xt_counters_info {
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__ret; \
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})
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#ifndef __KERNEL__
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/* fn returns 0 to continue iteration */
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#define XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
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({ \
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@ -172,6 +172,14 @@ struct xt_counters_info {
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(pos) < (typeof(pos))((char *)(ehead) + (esize)); \
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(pos) = (typeof(pos))((char *)(pos) + (pos)->next_offset))
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/* can only be xt_entry_match, so no use of typeof here */
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#define xt_ematch_foreach(pos, entry) \
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for ((pos) = (struct xt_entry_match *)entry->elems; \
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(pos) < (struct xt_entry_match *)((char *)(entry) + \
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(entry)->target_offset); \
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(pos) = (struct xt_entry_match *)((char *)(pos) + \
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(pos)->u.match_size))
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#ifdef __KERNEL__
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#include <linux/netdevice.h>
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@ -223,11 +223,11 @@ ipt_get_target(struct ipt_entry *e)
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return (void *)e + e->target_offset;
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}
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#ifndef __KERNEL__
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/* fn returns 0 to continue iteration */
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#define IPT_MATCH_ITERATE(e, fn, args...) \
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XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
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#ifndef __KERNEL__
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/* fn returns 0 to continue iteration */
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#define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
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XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
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@ -315,10 +315,6 @@ compat_ipt_get_target(struct compat_ipt_entry *e)
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#define COMPAT_IPT_ALIGN(s) COMPAT_XT_ALIGN(s)
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/* fn returns 0 to continue iteration */
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#define COMPAT_IPT_MATCH_ITERATE(e, fn, args...) \
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XT_MATCH_ITERATE(struct compat_ipt_entry, e, fn, ## args)
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#endif /* CONFIG_COMPAT */
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#endif /*__KERNEL__*/
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#endif /* _IPTABLES_H */
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@ -280,11 +280,11 @@ ip6t_get_target(struct ip6t_entry *e)
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return (void *)e + e->target_offset;
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}
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#ifndef __KERNEL__
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/* fn returns 0 to continue iteration */
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#define IP6T_MATCH_ITERATE(e, fn, args...) \
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XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)
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#ifndef __KERNEL__
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/* fn returns 0 to continue iteration */
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#define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
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XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)
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@ -343,10 +343,6 @@ compat_ip6t_get_target(struct compat_ip6t_entry *e)
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#define COMPAT_IP6T_ALIGN(s) COMPAT_XT_ALIGN(s)
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/* fn returns 0 to continue iteration */
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#define COMPAT_IP6T_MATCH_ITERATE(e, fn, args...) \
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XT_MATCH_ITERATE(struct compat_ip6t_entry, e, fn, ## args)
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#endif /* CONFIG_COMPAT */
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#endif /*__KERNEL__*/
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#endif /* _IP6_TABLES_H */
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@ -366,16 +366,21 @@ ipt_do_table(struct sk_buff *skb,
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do {
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const struct ipt_entry_target *t;
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const struct xt_entry_match *ematch;
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IP_NF_ASSERT(e);
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IP_NF_ASSERT(back);
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if (!ip_packet_match(ip, indev, outdev,
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&e->ip, mtpar.fragoff) ||
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IPT_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) {
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&e->ip, mtpar.fragoff)) {
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no_match:
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e = ipt_next_entry(e);
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continue;
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}
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xt_ematch_foreach(ematch, e)
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if (do_match(ematch, skb, &mtpar) != 0)
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goto no_match;
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ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
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t = ipt_get_target(e);
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@ -686,6 +691,7 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name,
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int ret;
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unsigned int j;
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struct xt_mtchk_param mtpar;
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struct xt_entry_match *ematch;
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ret = check_entry(e, name);
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if (ret)
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@ -697,7 +703,11 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name,
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mtpar.entryinfo = &e->ip;
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mtpar.hook_mask = e->comefrom;
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mtpar.family = NFPROTO_IPV4;
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ret = IPT_MATCH_ITERATE(e, find_check_match, &mtpar, &j);
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xt_ematch_foreach(ematch, e) {
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ret = find_check_match(ematch, &mtpar, &j);
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if (ret != 0)
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break;
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}
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if (ret != 0)
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goto cleanup_matches;
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@ -720,7 +730,9 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name,
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err:
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module_put(t->u.kernel.target->me);
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cleanup_matches:
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IPT_MATCH_ITERATE(e, cleanup_match, net, &j);
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xt_ematch_foreach(ematch, e)
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if (cleanup_match(ematch, net, &j) != 0)
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break;
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return ret;
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}
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@ -791,9 +803,12 @@ cleanup_entry(struct ipt_entry *e, struct net *net)
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{
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struct xt_tgdtor_param par;
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struct ipt_entry_target *t;
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struct xt_entry_match *ematch;
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/* Cleanup all matches */
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IPT_MATCH_ITERATE(e, cleanup_match, net, NULL);
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xt_ematch_foreach(ematch, e)
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if (cleanup_match(ematch, net, NULL) != 0)
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break;
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t = ipt_get_target(e);
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par.net = net;
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@ -1060,13 +1075,16 @@ static int compat_calc_entry(const struct ipt_entry *e,
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const struct xt_table_info *info,
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const void *base, struct xt_table_info *newinfo)
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{
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const struct xt_entry_match *ematch;
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const struct ipt_entry_target *t;
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unsigned int entry_offset;
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int off, i, ret;
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off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
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entry_offset = (void *)e - base;
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IPT_MATCH_ITERATE(e, compat_calc_match, &off);
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xt_ematch_foreach(ematch, e)
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if (compat_calc_match(ematch, &off) != 0)
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break;
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t = ipt_get_target_c(e);
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off += xt_compat_target_offset(t->u.kernel.target);
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newinfo->size -= off;
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@ -1441,7 +1459,8 @@ compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr,
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struct compat_ipt_entry __user *ce;
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u_int16_t target_offset, next_offset;
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compat_uint_t origsize;
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int ret;
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const struct xt_entry_match *ematch;
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int ret = 0;
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origsize = *size;
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ce = (struct compat_ipt_entry __user *)*dstptr;
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@ -1453,7 +1472,11 @@ compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr,
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*dstptr += sizeof(struct compat_ipt_entry);
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*size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
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ret = IPT_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size);
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xt_ematch_foreach(ematch, e) {
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ret = xt_compat_match_to_user(ematch, dstptr, size);
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if (ret != 0)
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break;
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}
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target_offset = e->target_offset - (origsize - *size);
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if (ret)
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return ret;
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@ -1505,9 +1528,12 @@ compat_release_match(struct ipt_entry_match *m, unsigned int *i)
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static void compat_release_entry(struct compat_ipt_entry *e)
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{
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struct ipt_entry_target *t;
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struct xt_entry_match *ematch;
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/* Cleanup all matches */
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COMPAT_IPT_MATCH_ITERATE(e, compat_release_match, NULL);
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xt_ematch_foreach(ematch, e)
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if (compat_release_match(ematch, NULL) != 0)
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break;
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t = compat_ipt_get_target(e);
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module_put(t->u.kernel.target->me);
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}
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@ -1522,6 +1548,7 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
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const unsigned int *underflows,
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const char *name)
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{
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struct xt_entry_match *ematch;
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struct ipt_entry_target *t;
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struct xt_target *target;
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unsigned int entry_offset;
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@ -1550,8 +1577,12 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
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off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
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entry_offset = (void *)e - (void *)base;
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j = 0;
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ret = COMPAT_IPT_MATCH_ITERATE(e, compat_find_calc_match, name,
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&e->ip, e->comefrom, &off, &j);
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xt_ematch_foreach(ematch, e) {
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ret = compat_find_calc_match(ematch, name,
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&e->ip, e->comefrom, &off, &j);
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if (ret != 0)
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break;
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}
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if (ret != 0)
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goto release_matches;
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@ -1590,7 +1621,9 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
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out:
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module_put(t->u.kernel.target->me);
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release_matches:
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IPT_MATCH_ITERATE(e, compat_release_match, &j);
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xt_ematch_foreach(ematch, e)
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if (compat_release_match(ematch, &j) != 0)
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break;
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return ret;
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}
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@ -1604,6 +1637,7 @@ compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr,
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struct ipt_entry *de;
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unsigned int origsize;
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int ret, h;
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struct xt_entry_match *ematch;
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ret = 0;
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origsize = *size;
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@ -1614,8 +1648,11 @@ compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr,
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*dstptr += sizeof(struct ipt_entry);
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*size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
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ret = COMPAT_IPT_MATCH_ITERATE(e, xt_compat_match_from_user,
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dstptr, size);
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xt_ematch_foreach(ematch, e) {
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ret = xt_compat_match_from_user(ematch, dstptr, size);
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if (ret != 0)
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break;
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}
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if (ret)
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return ret;
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de->target_offset = e->target_offset - (origsize - *size);
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@ -1636,9 +1673,10 @@ compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr,
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static int
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compat_check_entry(struct ipt_entry *e, struct net *net, const char *name)
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{
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struct xt_entry_match *ematch;
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struct xt_mtchk_param mtpar;
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unsigned int j;
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int ret;
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int ret = 0;
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j = 0;
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mtpar.net = net;
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@ -1646,7 +1684,11 @@ compat_check_entry(struct ipt_entry *e, struct net *net, const char *name)
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mtpar.entryinfo = &e->ip;
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mtpar.hook_mask = e->comefrom;
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mtpar.family = NFPROTO_IPV4;
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ret = IPT_MATCH_ITERATE(e, check_match, &mtpar, &j);
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xt_ematch_foreach(ematch, e) {
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ret = check_match(ematch, &mtpar, &j);
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if (ret != 0)
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break;
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}
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if (ret)
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goto cleanup_matches;
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@ -1656,7 +1698,9 @@ compat_check_entry(struct ipt_entry *e, struct net *net, const char *name)
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return 0;
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cleanup_matches:
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IPT_MATCH_ITERATE(e, cleanup_match, net, &j);
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xt_ematch_foreach(ematch, e)
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if (cleanup_match(ematch, net, &j) != 0)
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break;
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return ret;
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}
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@ -393,16 +393,21 @@ ip6t_do_table(struct sk_buff *skb,
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do {
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const struct ip6t_entry_target *t;
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const struct xt_entry_match *ematch;
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IP_NF_ASSERT(e);
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IP_NF_ASSERT(back);
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if (!ip6_packet_match(skb, indev, outdev, &e->ipv6,
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&mtpar.thoff, &mtpar.fragoff, &hotdrop) ||
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IP6T_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) {
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&mtpar.thoff, &mtpar.fragoff, &hotdrop)) {
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no_match:
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e = ip6t_next_entry(e);
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continue;
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}
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xt_ematch_foreach(ematch, e)
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if (do_match(ematch, skb, &mtpar) != 0)
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goto no_match;
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ADD_COUNTER(e->counters,
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ntohs(ipv6_hdr(skb)->payload_len) +
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sizeof(struct ipv6hdr), 1);
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@ -717,6 +722,7 @@ find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
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int ret;
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unsigned int j;
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struct xt_mtchk_param mtpar;
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struct xt_entry_match *ematch;
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ret = check_entry(e, name);
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if (ret)
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@ -728,7 +734,11 @@ find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
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mtpar.entryinfo = &e->ipv6;
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mtpar.hook_mask = e->comefrom;
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mtpar.family = NFPROTO_IPV6;
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ret = IP6T_MATCH_ITERATE(e, find_check_match, &mtpar, &j);
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xt_ematch_foreach(ematch, e) {
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ret = find_check_match(ematch, &mtpar, &j);
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if (ret != 0)
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break;
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}
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if (ret != 0)
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goto cleanup_matches;
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@ -751,7 +761,9 @@ find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
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err:
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module_put(t->u.kernel.target->me);
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cleanup_matches:
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IP6T_MATCH_ITERATE(e, cleanup_match, net, &j);
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xt_ematch_foreach(ematch, e)
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if (cleanup_match(ematch, net, &j) != 0)
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break;
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return ret;
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}
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@ -821,9 +833,12 @@ static void cleanup_entry(struct ip6t_entry *e, struct net *net)
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{
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struct xt_tgdtor_param par;
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struct ip6t_entry_target *t;
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struct xt_entry_match *ematch;
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/* Cleanup all matches */
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IP6T_MATCH_ITERATE(e, cleanup_match, net, NULL);
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xt_ematch_foreach(ematch, e)
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if (cleanup_match(ematch, net, NULL) != 0)
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break;
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t = ip6t_get_target(e);
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par.net = net;
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@ -1090,13 +1105,16 @@ static int compat_calc_entry(const struct ip6t_entry *e,
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const struct xt_table_info *info,
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const void *base, struct xt_table_info *newinfo)
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{
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const struct xt_entry_match *ematch;
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const struct ip6t_entry_target *t;
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unsigned int entry_offset;
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int off, i, ret;
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off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
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entry_offset = (void *)e - base;
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IP6T_MATCH_ITERATE(e, compat_calc_match, &off);
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xt_ematch_foreach(ematch, e)
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if (compat_calc_match(ematch, &off) != 0)
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break;
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t = ip6t_get_target_c(e);
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off += xt_compat_target_offset(t->u.kernel.target);
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newinfo->size -= off;
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@ -1474,7 +1492,8 @@ compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
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struct compat_ip6t_entry __user *ce;
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u_int16_t target_offset, next_offset;
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compat_uint_t origsize;
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int ret;
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const struct xt_entry_match *ematch;
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int ret = 0;
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origsize = *size;
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ce = (struct compat_ip6t_entry __user *)*dstptr;
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@ -1486,7 +1505,11 @@ compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
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*dstptr += sizeof(struct compat_ip6t_entry);
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*size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
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ret = IP6T_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size);
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xt_ematch_foreach(ematch, e) {
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ret = xt_compat_match_to_user(ematch, dstptr, size);
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if (ret != 0)
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break;
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}
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target_offset = e->target_offset - (origsize - *size);
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if (ret)
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return ret;
|
||||
@ -1538,9 +1561,12 @@ compat_release_match(struct ip6t_entry_match *m, unsigned int *i)
|
||||
static void compat_release_entry(struct compat_ip6t_entry *e)
|
||||
{
|
||||
struct ip6t_entry_target *t;
|
||||
struct xt_entry_match *ematch;
|
||||
|
||||
/* Cleanup all matches */
|
||||
COMPAT_IP6T_MATCH_ITERATE(e, compat_release_match, NULL);
|
||||
xt_ematch_foreach(ematch, e)
|
||||
if (compat_release_match(ematch, NULL) != 0)
|
||||
break;
|
||||
t = compat_ip6t_get_target(e);
|
||||
module_put(t->u.kernel.target->me);
|
||||
}
|
||||
@ -1555,6 +1581,7 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
|
||||
const unsigned int *underflows,
|
||||
const char *name)
|
||||
{
|
||||
struct xt_entry_match *ematch;
|
||||
struct ip6t_entry_target *t;
|
||||
struct xt_target *target;
|
||||
unsigned int entry_offset;
|
||||
@ -1583,8 +1610,12 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
|
||||
off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
|
||||
entry_offset = (void *)e - (void *)base;
|
||||
j = 0;
|
||||
ret = COMPAT_IP6T_MATCH_ITERATE(e, compat_find_calc_match, name,
|
||||
&e->ipv6, e->comefrom, &off, &j);
|
||||
xt_ematch_foreach(ematch, e) {
|
||||
ret = compat_find_calc_match(ematch, name,
|
||||
&e->ipv6, e->comefrom, &off, &j);
|
||||
if (ret != 0)
|
||||
break;
|
||||
}
|
||||
if (ret != 0)
|
||||
goto release_matches;
|
||||
|
||||
@ -1623,7 +1654,9 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
|
||||
out:
|
||||
module_put(t->u.kernel.target->me);
|
||||
release_matches:
|
||||
IP6T_MATCH_ITERATE(e, compat_release_match, &j);
|
||||
xt_ematch_foreach(ematch, e)
|
||||
if (compat_release_match(ematch, &j) != 0)
|
||||
break;
|
||||
return ret;
|
||||
}
|
||||
|
||||
@ -1637,6 +1670,7 @@ compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
|
||||
struct ip6t_entry *de;
|
||||
unsigned int origsize;
|
||||
int ret, h;
|
||||
struct xt_entry_match *ematch;
|
||||
|
||||
ret = 0;
|
||||
origsize = *size;
|
||||
@ -1647,8 +1681,11 @@ compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
|
||||
*dstptr += sizeof(struct ip6t_entry);
|
||||
*size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
|
||||
|
||||
ret = COMPAT_IP6T_MATCH_ITERATE(e, xt_compat_match_from_user,
|
||||
dstptr, size);
|
||||
xt_ematch_foreach(ematch, e) {
|
||||
ret = xt_compat_match_from_user(ematch, dstptr, size);
|
||||
if (ret != 0)
|
||||
break;
|
||||
}
|
||||
if (ret)
|
||||
return ret;
|
||||
de->target_offset = e->target_offset - (origsize - *size);
|
||||
@ -1670,8 +1707,9 @@ static int compat_check_entry(struct ip6t_entry *e, struct net *net,
|
||||
const char *name)
|
||||
{
|
||||
unsigned int j;
|
||||
int ret;
|
||||
int ret = 0;
|
||||
struct xt_mtchk_param mtpar;
|
||||
struct xt_entry_match *ematch;
|
||||
|
||||
j = 0;
|
||||
mtpar.net = net;
|
||||
@ -1679,7 +1717,11 @@ static int compat_check_entry(struct ip6t_entry *e, struct net *net,
|
||||
mtpar.entryinfo = &e->ipv6;
|
||||
mtpar.hook_mask = e->comefrom;
|
||||
mtpar.family = NFPROTO_IPV6;
|
||||
ret = IP6T_MATCH_ITERATE(e, check_match, &mtpar, &j);
|
||||
xt_ematch_foreach(ematch, e) {
|
||||
ret = check_match(ematch, &mtpar, &j);
|
||||
if (ret != 0)
|
||||
break;
|
||||
}
|
||||
if (ret)
|
||||
goto cleanup_matches;
|
||||
|
||||
@ -1689,7 +1731,9 @@ static int compat_check_entry(struct ip6t_entry *e, struct net *net,
|
||||
return 0;
|
||||
|
||||
cleanup_matches:
|
||||
IP6T_MATCH_ITERATE(e, cleanup_match, net, &j);
|
||||
xt_ematch_foreach(ematch, e)
|
||||
if (cleanup_match(ematch, net, &j) != 0)
|
||||
break;
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
@ -239,6 +239,7 @@ static bool tcpmss_tg4_check(const struct xt_tgchk_param *par)
|
||||
{
|
||||
const struct xt_tcpmss_info *info = par->targinfo;
|
||||
const struct ipt_entry *e = par->entryinfo;
|
||||
const struct xt_entry_match *ematch;
|
||||
|
||||
if (info->mss == XT_TCPMSS_CLAMP_PMTU &&
|
||||
(par->hook_mask & ~((1 << NF_INET_FORWARD) |
|
||||
@ -248,8 +249,9 @@ static bool tcpmss_tg4_check(const struct xt_tgchk_param *par)
|
||||
"FORWARD, OUTPUT and POSTROUTING hooks\n");
|
||||
return false;
|
||||
}
|
||||
if (IPT_MATCH_ITERATE(e, find_syn_match))
|
||||
return true;
|
||||
xt_ematch_foreach(ematch, e)
|
||||
if (find_syn_match(ematch))
|
||||
return true;
|
||||
printk("xt_TCPMSS: Only works on TCP SYN packets\n");
|
||||
return false;
|
||||
}
|
||||
@ -259,6 +261,7 @@ static bool tcpmss_tg6_check(const struct xt_tgchk_param *par)
|
||||
{
|
||||
const struct xt_tcpmss_info *info = par->targinfo;
|
||||
const struct ip6t_entry *e = par->entryinfo;
|
||||
const struct xt_entry_match *ematch;
|
||||
|
||||
if (info->mss == XT_TCPMSS_CLAMP_PMTU &&
|
||||
(par->hook_mask & ~((1 << NF_INET_FORWARD) |
|
||||
@ -268,8 +271,9 @@ static bool tcpmss_tg6_check(const struct xt_tgchk_param *par)
|
||||
"FORWARD, OUTPUT and POSTROUTING hooks\n");
|
||||
return false;
|
||||
}
|
||||
if (IP6T_MATCH_ITERATE(e, find_syn_match))
|
||||
return true;
|
||||
xt_ematch_foreach(ematch, e)
|
||||
if (find_syn_match(ematch))
|
||||
return true;
|
||||
printk("xt_TCPMSS: Only works on TCP SYN packets\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user